阅读说明：本技术 夹层玻璃用中间膜、卷体以及夹层玻璃 (Interlayer film for laminated glass, roll body, and laminated glass ) 是由 冲塚真珠美 石川由贵 松田美香 于 2019-01-30 设计创作，主要内容包括：本发明提供能够提高层间粘接力,并且能够提高从制备中间膜起经过一定时间后的隔音性的夹层玻璃用中间膜。本发明的夹层玻璃用中间膜为具有1层或2层以上结构的夹层玻璃用中间膜,将所述聚乙酸乙烯酯在N,O-双(三甲基甲硅烷基)三氟乙酰胺的存在下进行三甲基甲硅烷基化而得的化合物在氯仿-d中进行<Sup>1</Sup>H-NMR测定时,三甲基甲硅烷基的氢峰存在于0.06ppm以上0.3ppm以下,存在于0.06ppm以上0.3ppm以下的全部峰的峰强度相对于存在于4.5ppm以上5.3ppm以下的全部峰的强度的比满足0.02以上3以下。(The invention provides an interlayer film for a laminated glass, which can improve interlayer adhesion and improve sound insulation after a certain time from the preparation of the interlayer film. The interlayer film for laminated glass of the present invention is an interlayer film for laminated glass having a structure of 1 or 2 or more layers, wherein the polyvinyl acetate is added to N, O-bis (trimethylsilyl) trifluoroacetyl groupThe compound obtained by trimethylsilylation in the presence of an amine was carried out in chloroform-d 1 In H-NMR measurement, the hydrogen peak of the trimethylsilyl group is present at 0.06ppm to 0.3ppm, and the ratio of the peak intensity of all peaks present at 0.06ppm to 0.3ppm satisfies 0.02 to 3 inclusive with respect to the intensity of all peaks present at 4.5ppm to 5.3 ppm.)

1. An interlayer film for laminated glass having a structure of 1 or 2 or more layers, wherein,

the intermediate film is provided with a1 st layer comprising polyvinyl acetate,

the compound obtained by trimethylsilylating the polyvinyl acetate in the presence of N, O-bis (trimethylsilyl) trifluoroacetamide is carried out in chloroform-d¹In H-NMR measurement, the hydrogen peak of the trimethylsilyl group is present at 0.06ppm to 0.3ppm, and the ratio of the peak intensity of all peaks present at 0.06ppm to 0.3ppm satisfies 0.02 to 3 inclusive with respect to the intensity of all peaks present at 4.5ppm to 5.3 ppm.

2. The interlayer film for laminated glass according to claim 1, wherein,

the weight average molecular weight of the polyvinyl acetate is more than 30 ten thousand.

3. The interlayer film for laminated glass according to claim 1 or 2, wherein,

the 1 st layer includes a plasticizer.

4. The interlayer film for laminated glass according to claim 3,

the content of the plasticizer in the layer 1 is 30 parts by weight or more with respect to 100 parts by weight of the polyvinyl acetate.

5. The interlayer film for laminated glass according to any one of claims 1 to 4,

the intermediate film is provided with a2 nd layer,

the 2 nd layer is laminated on the 1 st surface of the 1 st layer.

6. The interlayer film for laminated glass according to claim 5, wherein,

the 2 nd layer comprises a thermoplastic resin.

7. The interlayer film for laminated glass according to claim 6, wherein,

the thermoplastic resin in the 2 nd layer is a polyvinyl acetal resin.

8. The interlayer film for laminated glass according to claim 6 or 7, wherein,

the 1 st layer contains a plasticizer and, optionally,

the 2 nd layer includes a plasticizer.

9. The interlayer film for laminated glass according to claim 8, wherein,

the plasticizer having the highest content in the 2 nd layer is the same as the plasticizer having the highest content in the 1 st layer,

a combination of the plasticizer having the largest content in the 2 nd layer, the thermoplastic resin in the 2 nd layer, the plasticizer having the largest content in the 1 st layer, and the polyvinyl acetate in the 1 st layer satisfies the following constitution,

the method comprises the following steps: the cloud point measured using a liquid obtained by mixing 8 parts by weight of the thermoplastic resin in the 2 nd layer with 100 parts by weight of the plasticizer having the largest content among the plasticizers in the 2 nd layer is higher than the cloud point measured using a liquid obtained by mixing 8 parts by weight of the polyvinyl acetate in the 1 st layer with 100 parts by weight of the plasticizer having the largest content among the plasticizers in the 1 st layer by 30 ℃ or higher.

10. The interlayer film for laminated glass according to any one of claims 5 to 9,

the intermediate film is provided with a 3 rd layer,

the 3 rd laminated layer is on a2 nd surface of the 1 st layer opposite the 1 st surface.

11. The interlayer film for laminated glass according to claim 10,

the 3 rd layer comprises a thermoplastic resin.

12. The interlayer film for laminated glass according to claim 11, wherein,

the thermoplastic resin in the 3 rd layer is a polyvinyl acetal resin.

13. The interlayer film for laminated glass according to any one of claims 10 to 12, wherein,

the 1 st layer contains a plasticizer and, optionally,

the 2 nd layer contains a plasticizer and, optionally,

the 3 rd layer comprises a plasticizer.

14. The interlayer film for laminated glass according to claim 13, wherein,

the 2 nd layer comprises a thermoplastic resin,

the 3 rd layer comprises a thermoplastic resin,

the content of the plasticizer in the 1 st layer with respect to 100 parts by weight of the polyvinyl acetate is higher than the content of the plasticizer in the 2 nd layer with respect to 100 parts by weight of the thermoplastic resin,

the content of the plasticizer in the 1 st layer with respect to 100 parts by weight of the polyvinyl acetate is higher than the content of the plasticizer in the 3 rd layer with respect to 100 parts by weight of the thermoplastic resin.

15. A roll body, comprising:

a winding core, and

the interlayer film for laminated glass according to any one of claims 1 to 14, wherein,

the interlayer film for laminated glass is wound around the outer periphery of the winding core.

16. A laminated glass is provided with:

the 1 st laminated glass member,

The 2 nd laminated glass member, and

the interlayer film for laminated glass according to any one of claims 1 to 14, wherein,

the interlayer film for laminated glass is disposed between the 1 st laminated glass member and the 2 nd laminated glass member.

Technical Field

The present invention relates to an interlayer film for laminated glass for obtaining a laminated glass. The present invention also relates to a roll using the interlayer film for laminated glass, and a laminated glass.

Background

The laminated glass is less in scattering of broken glass pieces and excellent in safety even when broken by external impact. Therefore, the laminated glass is widely used in vehicles, railway vehicles, spacecrafts, ships, buildings, and the like. The laminated glass is produced by sandwiching an interlayer film for laminated glass between two glass plates.

As an example of the interlayer film for a laminated glass, patent document 1 below discloses an interlayer film containing 100 parts by weight of a partially saponified ethylene-vinyl acetate copolymer or an acid-modified product thereof, 2 to 20 parts by weight of rosins, and 0.5 to 10 parts by weight of a plasticizer. Patent document 1 describes that an adhesive interlayer film for laminated glass having excellent plasticizer resistance in addition to adhesiveness and transparency can be provided. Patent document 1 describes that an interlayer film is favorably adhered to glass, a polyester film, a polarizing film, an acrylic plate, a polycarbonate plate, and the like.

Patent document 2 discloses an interlayer film including a1 st layer and a2 nd layer laminated on the 1 st surface of the 1 st layer. In the intermediate film, the 1 st layer contains a polyvinyl acetate resin and a plasticizer. Patent document 2 describes that the sound-insulating property of the laminated glass can be improved.

Disclosure of Invention

Technical problem to be solved by the invention

In the conventional interlayer film described in patent document 1, even if the adhesiveness can be improved to some extent, the sound-insulating property may not be improved.

In addition, in the conventional interlayer film described in patent document 1, even if the adhesiveness can be improved to some extent, the adhesiveness may not be improved significantly.

Further, after the conventional intermediate film is prepared, the sound insulation may be lowered after a certain time has elapsed.

The purpose of the present invention is to provide an interlayer film for laminated glass, which can improve interlayer adhesion and can improve sound insulation after a certain period of time has elapsed from the production of the interlayer film. Another object of the present invention is to provide a roll using the interlayer film for laminated glass, and a laminated glass.

Means for solving the problems

According to a broad aspect of the present invention, there is provided an interlayer for laminated glass (hereinafter, may be referred to as an interlayer) having a structure of 1 or 2 or more layers, the interlayer comprising a1 st layer containing polyvinyl acetate, wherein a compound obtained by trimethylsilylating the polyvinyl acetate in the presence of N, O-bis (trimethylsilyl) trifluoroacetamide is carried out in chloroform-d¹In H-NMR measurement, the hydrogen peak of the trimethylsilyl group is present at 0.06ppm to 0.3ppm, and the ratio of the peak intensity of all peaks present at 0.06ppm to 0.3ppm satisfies 0.02 to 3 inclusive with respect to the intensity of all peaks present at 4.5ppm to 5.3 ppm.

In one specific embodiment of the intermediate film of the present invention, the polyvinyl acetate has a weight average molecular weight of 30 ten thousand or more.

In one specific embodiment of the intermediate film of the present invention, the layer 1 contains a plasticizer.

In one specific embodiment of the intermediate film of the present invention, the content of the plasticizer in the 1 st layer is 30 parts by weight or more with respect to 100 parts by weight of the polyvinyl acetate.

In one specific aspect of the intermediate film of the present invention, the intermediate film includes a2 nd layer, and the 2 nd layer is laminated on a1 st surface of the 1 st layer.

In a specific aspect of the intermediate film of the present invention, the 2 nd layer contains a thermoplastic resin.

In one specific aspect of the intermediate film of the present invention, the thermoplastic resin in the 2 nd layer is a polyvinyl acetal resin.

In a specific embodiment of the intermediate film of the present invention, the 1 st layer contains a plasticizer, and the 2 nd layer contains a plasticizer.

In one specific embodiment of the intermediate film of the present invention, the plasticizer having the largest content among the plasticizers in the 2 nd layer is the same as the plasticizer having the largest content among the plasticizers in the 1 st layer, and a combination of the plasticizer having the largest content among the plasticizers in the 2 nd layer, the thermoplastic resin in the 2 nd layer, the plasticizer having the largest content among the plasticizers in the 1 st layer, and the polyvinyl acetate in the 1 st layer satisfies the following configuration.

The method comprises the following steps: the cloud point measured using a liquid obtained by mixing 8 parts by weight of the thermoplastic resin in the 2 nd layer with 100 parts by weight of the plasticizer having the largest content among the plasticizers in the 2 nd layer is higher than the cloud point measured using a liquid obtained by mixing 8 parts by weight of the polyvinyl acetate in the 1 st layer with 100 parts by weight of the plasticizer having the largest content among the plasticizers in the 1 st layer by 30 ℃ or higher.

In one specific aspect of the intermediate film of the present invention, the intermediate film includes a 3 rd layer, and the 3 rd layer is laminated on a2 nd surface of the 1 st layer opposite to the 1 st surface.

In a specific aspect of the intermediate film of the present invention, the 3 rd layer contains a thermoplastic resin.

In one specific aspect of the intermediate film of the present invention, the thermoplastic resin in the 3 rd layer is a polyvinyl acetal resin.

In a specific embodiment of the intermediate film of the present invention, the 1 st layer contains a plasticizer, the 2 nd layer contains a plasticizer, and the 3 rd layer contains a plasticizer.

In a specific aspect of the intermediate film of the present invention, the 2 nd layer contains a thermoplastic resin, the 3 rd layer contains a thermoplastic resin, the content of the plasticizer in the 1 st layer with respect to 100 parts by weight of the polyvinyl acetate is higher than the content of the plasticizer in the 2 nd layer with respect to 100 parts by weight of the thermoplastic resin, and the content of the plasticizer in the 1 st layer with respect to 100 parts by weight of the polyvinyl acetate is higher than the content of the plasticizer in the 3 rd layer with respect to 100 parts by weight of the thermoplastic resin.

According to a broad aspect of the present invention, there is provided a roll body including a roll core and the interlayer film for laminated glass, the interlayer film for laminated glass being wound around an outer periphery of the roll core.

According to a broad aspect of the present invention, there is provided a laminated glass comprising a1 st laminated glass member, a2 nd laminated glass member, and the interlayer film for laminated glass, wherein the interlayer film for laminated glass is disposed between the 1 st laminated glass member and the 2 nd laminated glass member.

ADVANTAGEOUS EFFECTS OF INVENTION

The interlayer film for laminated glass of the present invention has a structure having 1 or 2 or more layers. The interlayer film for laminated glass of the present invention comprises a1 st layer comprising polyvinyl acetate. The intermediate film for laminated glass of the present invention is characterized in that a compound obtained by trimethylsilylating the polyvinyl acetate in the 1 st layer in the presence of N, O-bis (trimethylsilyl) trifluoroacetamide is added to chloroform-d¹H-NMR measurement. In the interlayer film for laminated glass of the present invention, the above¹In the H-NMR measurement, the hydrogen peak of the trimethylsilyl group was present at 0.06ppm to 0.3 ppm. In the interlayer film for laminated glass of the present invention, the above¹In the measurement of H-NMR, the ratio of the intensity of all peaks existing at 0.06ppm to 0.3ppm to the intensity of all peaks existing at 4.5ppm to 5.3ppm satisfies 0.02 to 0.023 or less. In the present invention, since the interlayer film for laminated glass has the above-described configuration, interlayer adhesion can be improved, and sound insulation properties after a certain period of time has elapsed from the production of the interlayer film can be improved.

The present invention will be described in detail below.

(intermediate film for laminated glass)

The interlayer film for laminated glass of the present invention (hereinafter, may be referred to as an interlayer film) has a structure of 1 layer or 2 or more layers.

The intermediate film of the present invention has a1 st layer containing polyvinyl acetate.

The intermediate film of the present invention is characterized in that a compound obtained by trimethylsilylating the polyvinyl acetate in the layer 1 in the presence of N, O-bis (trimethylsilyl) trifluoroacetamide is treated in chloroform-d¹H-NMR measurement. The compound obtained by the Trimethylsilyl (TMS) reaction is polyvinyl acetate. In the intermediate film of the present invention, the¹In the H-NMR measurement, the hydrogen peak of the trimethylsilyl group was present at 0.06ppm to 0.3 ppm. In the interlayer film for laminated glass of the present invention, the above¹All peaks present at 0.06ppm to 0.3ppm in the measurement of H-NMRThe ratio of the intensity to the intensity of all peaks present at 4.5ppm to 5.3ppm satisfies 0.02 to 3. In the interlayer film of the present invention, when the intensity of all peaks present at 4.5ppm to 5.3ppm is 1, the intensity of all peaks present at 0.06ppm to 0.3ppm is 0.02 to 3.

In the present invention, since the interlayer film has the above-described configuration, interlayer adhesion can be improved, and sound insulation after a certain period of time has elapsed from the production of the interlayer film can be improved. In the present invention, for example, the adhesion of the 1 st layer to the 2 nd layer can be improved. For example, even if the intermediate film is bent or rolled, peeling is less likely to occur.

In the present invention, the adhesion of the 1 st layer to the laminated glass member and the adhesion of the 1 st layer to other layers in the interlayer film can be improved. In particular, the adhesion of the 1 st layer to the other layers in the interlayer film can be improved. In particular, when the other layer contains a polyvinyl acetal resin, the adhesion of the 1 st layer to the other layer containing a polyvinyl acetal resin can be improved.

The trimethylsilylation of the polyvinyl acetate can be carried out in the following manner.

After swelling polyvinyl acetate 100mg with a small amount of chloroform, 250. mu.L of a trimethylsilylating agent (N, O-bis (trimethylsilyl) trifluoroacetamide: BSTFA) was added and stirred with a shaker for 1 hour. To the mixture was added 250. mu.L of deuterated chloroform solvent, and the mixture was stirred with a shaker for 1 hour to obtain TMS-modified polyvinyl acetate.

The polyvinyl acetate contained in the intermediate film may be trimethylsilylated by the following method. In the case where the intermediate film is a multilayer intermediate film including, for example, the 1 st, 2 nd and 3 rd layers, the 1 st layer is separated from the 2 nd and 3 rd layers to obtain the 1 st layer. In the case where the interlayer is a single-layer interlayer provided with only the 1 st layer, the interlayer itself is the 1 st layer. After dissolving the layer 1 in Tetrahydrofuran (THF), polyvinyl acetate was isolated by liquid chromatography. The solvent was then distilled off and dried to obtain polyvinyl acetate. The obtained polyvinyl acetate was trimethylsilylated in the same manner as described above. In the case of a laminated glass, the laminated glass may be cooled by liquid nitrogen or the like, and then the laminated glass member and the interlayer film may be peeled off, and the obtained interlayer film may be used to carry out the trimethylsilylation of the polyvinyl acetate.

In the intermediate film of the present invention, the¹In the H-NMR measurement, the hydrogen peak of the trimethylsilyl group was present at 0.06ppm to 0.3 ppm.

The ratio (the intensity of all peaks present at 0.06ppm to 0.3 ppm/the intensity of all peaks present at 4.5ppm to 5.3 ppm) may be expressed as a peak ratio. In the interlayer film for laminated glass of the present invention, the above¹In the measurement of H-NMR, the peak ratio is 0.02 to 3. The peak intensity of all the peaks is the sum of the intensities of all the peaks. The peak ratio of¹In the measurement of H-NMR, the intensity of all peaks present at 4.5ppm to 5.3ppm was defined as 1.

From the viewpoint of effectively improving the sound-insulating property and the interlayer adhesion, the peak ratio is preferably 0.03 or more, more preferably 0.04 or more, further preferably 0.05 or more, preferably 3.0 or less, and more preferably 2.5 or less.

Peaks present at 4.5ppm to 5.3ppm are derived from structural units derived from vinyl acetate.

The intermediate film of the present invention may have a 1-layer structure of only the 1 st layer. The intermediate film of the present invention may have a 2-layer structure, a 2-layer or more structure, a 3-layer structure, or a 3-layer or more structure. The intermediate film may be a single layer intermediate film or a multilayer intermediate film.

The interlayer film of the present invention may include a1 st layer and a2 nd layer laminated on the 1 st surface of the 1 st layer, from the viewpoint of effectively improving the sound insulation property and the adhesiveness between the layers.

The interlayer film of the present invention may include a1 st layer and a2 nd layer laminated on a1 st surface of the 1 st layer, and may further include a 3 rd layer laminated on a2 nd surface of the 1 st layer opposite to the 1 st surface, from the viewpoint of effectively improving the sound insulation property and the adhesiveness between the layers. In this case, the 1 st layer contains the polyvinyl acetate. In the present invention, the adhesion of the 1 st layer to the 2 nd layer can be improved, and the adhesion of the 1 st layer to the 3 rd layer can be improved.

From the viewpoint of effectively improving the sound-insulating property and the adhesiveness between the layers, the interlayer film of the present invention may further include a 4 th layer disposed on the 2 nd layer opposite to the 1 st layer side, and may further include a 5 th layer disposed on the 3 rd layer opposite to the 1 st layer side.

From the viewpoint of effectively improving the sound-insulating property and the adhesion between the interlayer and the glass, the 1 st layer is preferably not a surface layer in the interlayer, and is preferably an interlayer in the interlayer. However, the 1 st layer may be a surface layer in an intermediate film. The 2 nd layer, the 3 rd layer, the 4 th layer and the 5 th layer may be a surface layer in an intermediate film or an intermediate layer in an intermediate film, respectively.

From the viewpoint of improving the transparency of the interlayer film and the laminated glass, the haze of the interlayer film is preferably 2.0% or less, more preferably 1.0% or less, further preferably 0.5% or less, further preferably 0.4% or less, particularly preferably 0.3% or less, and most preferably 0.2% or less.

The haze of the interlayer film may be measured based on JIS K6714. The haze of the interlayer film can be measured by disposing an interlayer film between 2 sheets of transparent glass. The thickness of the transparent glass is preferably 2.0 mm.

The interlayer film preferably has a visible light transmittance of 70% or more, more preferably 80% or more, and still more preferably 85% or more, from the viewpoint of improving the transparency of the laminated glass.

The visible light transmittance was measured by using a spectrophotometer (HITACHI HIGH-TECH, "U-4100") in accordance with JIS R3211: 1998, the measurement is carried out at a wavelength of 380 to 780 nm.

The visible light transmittance of the interlayer film was measured by disposing an interlayer film between 2 sheets of transparent glass. The thickness of the transparent glass is preferably 2.0 mm.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to embodiment 1 of the present invention.

The interlayer film 11 shown in fig. 1 is a multilayer interlayer film having a structure of 2 or more layers. Specifically, the interlayer film 11 has a 3-layer structure. The interlayer film 11 is used to obtain a laminated glass. The interlayer film 11 is an interlayer film for laminated glass. The interlayer film 11 includes a1 st layer 1, a2 nd layer 2, and a 3 rd layer 3. The 1 st layer 1 has a2 nd layer 2 disposed and laminated on the 1 st surface 1a side. The 1 st layer 1 has a 3 rd layer 3 disposed and laminated on the 2 nd surface 1b side opposite to the 1 st surface 1 a. Layer 1 is an intermediate layer. The 2 nd layer 2 and the 3 rd layer 3 are protective layers, respectively, and are surface layers in the present embodiment. The 1 st layer 1 is disposed and sandwiched between the 2 nd layer 2 and the 3 rd layer 3. Therefore, the interlayer film 11 has a multilayer structure (2 nd layer 2/1 st layer 1/3 rd layer 3) in which the 2 nd layer 2, the 1 st layer 1, and the 3 rd layer 3 are sequentially laminated.

Fig. 5 is a perspective view schematically showing a roll body obtained by winding the interlayer film for laminated glass shown in fig. 1.

The intermediate film 11 may be wound to form a roll 51 of the intermediate film 11.

The roll 51 shown in fig. 5 includes a winding core 61 and an intermediate film 11. The intermediate film 11 is wound around the outer periphery of the winding core 61.

Fig. 2 is a cross-sectional view schematically showing an interlayer film for laminated glass according to embodiment 2 of the present invention.

The interlayer film 11A shown in fig. 2 is a single-layer interlayer film having a 1-layer structure. The interlayer film 11A is the 1 st layer. The interlayer film 11A is used to obtain a laminated glass. The interlayer film 11A is an interlayer film for laminated glass.

The intermediate film, the 1 st layer, the 2 nd layer and the 3 rd layer of the present invention, and the components used in the intermediate film will be described in detail below.

(resin)

The 1 st layer contains polyvinyl acetate (hereinafter, sometimes referred to as polyvinyl acetate (1)). The polyvinyl acetate (1) in the 1 st layer is not particularly limited. The polyvinyl acetate (1) is generally a thermoplastic resin. The polyvinyl acetate (1) may be used alone in1 kind or in combination of 2 or more kinds.

The polyvinyl acetate (1) is prepared by carrying out the reaction in the chloroform-d¹Polyvinyl acetate satisfying the peak and peak intensity in the measurement of H-NMR.

Examples of the functional group having a peak obtained by trimethylsilylation in the above-mentioned range include a hydroxyl group, an amide group, and a carboxyl group. The functional group is preferably a hydroxyl group or an amide group, and more preferably a hydroxyl group, from the viewpoint of effectively improving sound-insulating properties and interlayer adhesion.

From the viewpoint of the excellent effects of the present invention, the polyvinyl acetate (1) is preferably a polymer of a polymerizable composition containing vinyl acetate and a monomer having the functional group.

Examples of the monomer having such a functional group include 3-methyl-3-buten-1-ol, ethylene glycol monovinyl ether, and isopropylacrylamide.

From the viewpoint of effectively improving the sound-insulating property, the weight average molecular weight of the polyvinyl acetate (1) is preferably 25 ten thousand or more, more preferably 30 ten thousand or more, further preferably 40 ten thousand or more, and particularly preferably 50 ten thousand or more. From the viewpoint of improving the interlayer adhesion, the weight average molecular weight of the polyvinyl acetate (1) is preferably 120 ten thousand or less, and more preferably 90 ten thousand or less.

The weight average molecular weight means a weight average molecular weight in polystyrene measured by Gel Permeation Chromatography (GPC).

The method for synthesizing the polyvinyl acetate (1) by polymerizing the polymerizable composition is not particularly limited. Examples of the synthesis method include solution polymerization, suspension polymerization, and UV polymerization.

The method for synthesizing polyvinyl acetate (1) is preferably a solution polymerization method from the viewpoint of improving the transparency of the interlayer film and effectively improving the sound insulation property and the interlayer adhesion in the interlayer film having improved transparency.

The polyvinyl acetate (1) is a copolymer of a monomer having vinyl acetate and trimethylsilyl peaks in a predetermined range and a polymerizable compound (copolymerization component) other than these compounds. The polymerizable composition may contain the vinyl acetate and a polymerizable compound other than the monomer. In the polymerizable composition, vinyl acetate is preferably contained as a main component as the polymerizable compound. The proportion of the structural unit (skeleton) derived from vinyl acetate in 100 mol% of the total structural units (skeletons) of the polyvinyl acetate (1) is preferably 50 mol% or more, more preferably 60 mol% or more, still more preferably 70 mol% or more, particularly preferably 80 mol% or more, and most preferably 90 mol% or more. Examples of the polymerizable compound other than vinyl acetate include a (meth) acrylic compound, a styrene compound, and an isoprene compound.

In addition, the presence of the polymerizable compound other than vinyl acetate is considered to be in the above¹In the measurement of H-NMR, when two or more peaks are present at 4.5ppm to 5.3ppm, the intensity of the peak present at 5.0ppm to 5.3ppm is defined as 1.

The 1 st layer may contain a thermoplastic resin other than the polyvinyl acetate (1). The 1 st layer may contain a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (1)).

In the case where the 1 st layer contains the polyvinyl acetate (1) and the polyvinyl acetal resin (1), the following preferable contents are preferably satisfied. The content of the polyvinyl acetate (1) is preferably 1% by weight or more, more preferably 10% by weight or more, further preferably 20% by weight or more, and particularly preferably 50% by weight or more, based on 100% by weight of the total of the polyvinyl acetate (1) and the polyvinyl acetal resin (1). The content of the polyvinyl acetate (1) is preferably 99% by weight or less, more preferably 90% by weight or less, and still more preferably 80% by weight or less, based on 100% by weight of the total of the polyvinyl acetate (1) and the polyvinyl acetal resin (1). When the content is not more than the upper limit, the interlayer adhesion is further improved. When the content is not less than the lower limit, the sound insulation of the laminated glass is further improved.

The 2 nd layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (2)). In the 2 nd layer, the thermoplastic resin (2) preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as a polyvinyl acetal resin (2)). The 3 rd layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (3)). In the above layer 3, the thermoplastic resin (3) preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as a polyvinyl acetal resin (3)). The thermoplastic resin (2) and the thermoplastic resin (3) may be the same or different. The polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) may be the same or different. From the viewpoint of further improving the sound-insulating property, the thermoplastic resin (2) and the thermoplastic resin (3) are preferably the same. From the viewpoint of further improving the sound-insulating property, the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) are preferably the same. The thermoplastic resin (2) and the thermoplastic resin (3) may be used alone or in combination of 1 or more. The polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) may be used alone or in combination of 1 or more.

The thermoplastic resin is a resin that softens and exhibits plasticity when heated and solidifies when cooled to room temperature. The thermoplastic elastomer is a resin that softens and develops plasticity when heated and solidifies and develops rubber elasticity when cooled to room temperature (25 ℃).

Examples of the thermoplastic resin include: polyvinyl acetal resins, polyester resins, aliphatic polyolefins, polystyrenes, ethylene-vinyl acetate copolymer resins, ethylene-acrylic acid copolymer resins, polyurethane resins, ionomer resins, polyvinyl alcohol resins, polyvinyl acetate resins, and the like. Thermoplastic resins other than these may also be used.

The thermoplastic resin mentioned above can be a thermoplastic elastomer by adjusting the molecular structure, polymerization degree, and the like of the resin.

The polyvinyl acetal resin is preferably an acetal compound of polyvinyl alcohol. The polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The saponification degree of the polyvinyl alcohol is usually 70 to 99.9 mol%.

The polyvinyl alcohol (PVA) has an average polymerization degree of preferably 200 or more, more preferably 500 or more, further preferably 1500 or more, further preferably 1600 or more, particularly preferably 2600 or more, most preferably 2700 or more, preferably 5000 or less, more preferably 4000 or less, further preferably 3500 or less. When the average polymerization degree is not less than the lower limit, the penetration resistance and bending rigidity of the laminated glass are further improved. When the average polymerization degree is not more than the upper limit, the intermediate film can be easily formed.

The average polymerization degree of the polyvinyl alcohol is determined by a method based on JIS K6726 "polyvinyl alcohol test method".

The carbon number of the acetal group in the polyvinyl acetal resin is preferably 2 to 10, more preferably 2 to 5, and further preferably 2, 3, or 4. In addition, the number of carbon atoms of the acetal group in the polyvinyl acetal resin is preferably 2 or 4, and in this case, the production of the polyvinyl acetal resin is relatively efficient.

As the aldehyde, an aldehyde having 1 to 10 carbon atoms is generally preferably used. Examples of the aldehyde having 1 to 10 carbon atoms include: formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexanal, n-octylaldehyde, n-nonanal, n-decanal, p-isopropylbenzaldehyde, benzaldehyde and the like. Acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexanal, or n-valeraldehyde is preferred. Acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, or n-valeraldehyde is more preferred, and acetaldehyde, n-butyraldehyde, or n-valeraldehyde is further preferred. The aldehydes may be used alone in1 kind or in combination of 2 or more kinds.

The respective content ratios of the hydroxyl groups in the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) are preferably 25 mol% or more, preferably 38 mol% or less, more preferably 35 mol% or less, further preferably 32 mol% or less, particularly preferably 30 mol% or less, and most preferably 27.5 mol% or less. When the content of the hydroxyl group is not less than the lower limit, the adhesive strength of the interlayer film is further improved. When the content of the hydroxyl group is not more than the upper limit, the flexibility of the interlayer film is improved, and the interlayer film can be easily handled. When the content of the hydroxyl group is not more than the upper limit, the rigidity is effectively improved.

The content of hydroxyl groups in the polyvinyl acetal resin is a value represented by a percentage of a molar fraction obtained by dividing the amount of ethylene groups to which hydroxyl groups are bonded by the total amount of ethylene groups in the main chain. The amount of the above-mentioned ethylene group to which a hydroxyl group is bonded can be measured, for example, by "polyvinyl butyral test method" in accordance with JIS K6728.

The degree of acetylation of each of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, preferably 10 mol% or less, and more preferably 2 mol% or less. When the acetylation degree is not less than the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is improved. When the acetylation degree is not more than the upper limit, the moisture resistance of the interlayer film and the laminated glass is improved.

The acetylation degree is a value represented by a percentage of a molar fraction obtained by dividing the amount of ethylene groups to which acetyl groups are bonded by the total amount of ethylene groups in the main chain. The amount of the ethylene group to which the acetyl group is bonded can be measured, for example, in accordance with JIS K6728 "test method for polyvinyl butyral".

The acetalization degree (butyralization degree in the case of a polyvinyl butyral resin) of each of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 55 mol% or more, more preferably 67 mol% or more, preferably 75 mol% or less, and more preferably 71 mol% or less. When the acetalization degree is not less than the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is improved. When the acetalization degree is not more than the upper limit, the reaction time required for producing the polyvinyl acetal resin becomes short.

The acetalization degree is obtained as follows. First, a value obtained by subtracting the amount of the hydroxyl group-bonded ethylene group and the acetyl group-bonded ethylene group from the total ethylene group amount of the main chain was obtained. The molar fraction was determined by dividing the obtained value by the total ethylene amount of the main chain. The value of the mole fraction expressed as a percentage is the acetalization degree.

The content of the hydroxyl group (amount of hydroxyl group), the acetalization degree (butyralization degree) and the acetylation degree are preferably calculated from the results obtained by measurement in accordance with JIS K6728 "test method for polyvinyl butyral". However, measurements based on ASTM D1396-92 can also be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the content of the hydroxyl groups (amount of hydroxyl groups), the acetalization degree (butyralization degree) and the acetylation degree can be calculated from the results obtained by the measurement according to JIS K6728 "polyvinyl butyral test method".

(plasticizer)

The intermediate film preferably comprises a plasticizer. The layer 1 (including the single-layer interlayer) preferably contains a plasticizer (hereinafter, referred to as plasticizer (1)) in some cases. The 2 nd layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (2)). The 3 rd layer preferably contains a plasticizer (hereinafter, referred to as plasticizer (3)) in some cases. By using a plasticizer or by using a polyvinyl acetal resin and a plasticizer in combination, the penetration resistance is further improved, and the adhesion of a layer containing a polyvinyl acetal resin and a plasticizer to a laminated glass member or another layer is appropriately improved. The plasticizer is not particularly limited. The plasticizer (1), the plasticizer (2) and the plasticizer (3) may be the same or different. The plasticizer (1), the plasticizer (2) and the plasticizer (3) may be used alone or in combination of 1 or more.

Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and organic phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers. The plasticizer is preferably an organic ester plasticizer. The plasticizer is preferably a liquid plasticizer.

Examples of the monobasic organic acid ester include glycol esters obtained by the reaction of a glycol and a monobasic organic acid. Examples of the diol include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octanoic acid, 2-ethylhexanoic acid, n-nonanoic acid, decanoic acid, and the like.

The polybasic organic acid ester includes ester compounds of a polybasic organic acid and an alcohol having a linear or branched structure having 4 to 8 carbon atoms. Examples of the polyvalent organic acid include adipic acid, sebacic acid, azelaic acid and the like.

Examples of the organic ester plasticizer include: triethylene glycol di-2-ethylpropionate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-caprylate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol oxalate, ethylene glycol di-2-ethylbutyrate, 1, 3-propanediol di-2-ethylbutyrate, 1, 4-butanediol di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylvalerate, tetraethylene glycol di-2-ethylbutyrate, and mixtures thereof, Diethylene glycol dicaprylate, dibutyl maleate, bis (2-butoxyethyl) adipate, dibutyl adipate, diisobutyl adipate, 2-butoxyethoxyethyl adipate, glycol benzoate, 1, 3-butanediol adipate polyester, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, a mixture of heptyl and nonyl adipates, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, tributyl citrate, tributyl acetylcitrate, diethyl carbonate, dibutyl sebacate, oil-modified sebacic acid, and a mixture of phosphate esters and adipate. Organic ester plasticizers other than these may also be used. Adipates other than those mentioned above may also be used.

Examples of the organic phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, tricresyl phosphate, triisopropyl phosphate, and the like.

The plasticizer may be a diester plasticizer represented by the following formula (1).

[ chemical formula 1]

In the formula (1), R1 and R2 respectively represent an organic group having 2-10 carbon atoms, R3 represents an ethylene group, an isopropylene group or an n-propylene group, and p represents an integer of 3-10. R1 and R2 in the formula (1) are respectively preferably organic groups with 5-10 carbon atoms, and more preferably organic groups with 6-10 carbon atoms.

The plasticizer preferably comprises an adipate ester, more preferably bis (2-butoxyethyl) adipate or dibutyl adipate.

In the layer 1, the content of the plasticizer (1) is defined as content (1) with respect to 100 parts by weight of the polyvinyl acetate (1). The content (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, further preferably 60 parts by weight or more, preferably 100 parts by weight or less, more preferably 90 parts by weight or less, further preferably 85 parts by weight or less, and particularly preferably 80 parts by weight or less. When the content (1) is not less than the lower limit, the flexibility of the interlayer film is improved, and the interlayer film can be easily handled. When the content (1) is not more than the upper limit, the penetration resistance of the laminated glass is further improved.

When the first layer 1 contains the polyvinyl acetal resin (1), the content of the plasticizer (1) to 100 parts by weight of the total of the polyvinyl acetate (1) and the polyvinyl acetal resin (1) is defined as content (1A). The content (1A) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, further preferably 60 parts by weight or more, preferably 100 parts by weight or less, more preferably 90 parts by weight or less, further preferably 85 parts by weight or less, and particularly preferably 80 parts by weight or less. When the content (1A) is not less than the lower limit, the flexibility of the interlayer film is improved, and the interlayer film can be easily handled. When the content (1A) is not more than the upper limit, the penetration resistance of the laminated glass is further improved.

In the 2 nd layer, the content of the plasticizer (2) is defined as content (2) with respect to 100 parts by weight of the thermoplastic resin (2) (in the case where the thermoplastic resin (2) is a polyvinyl acetal resin (2), 100 parts by weight of the polyvinyl acetal resin (2)). In the 3 rd layer, the content of the plasticizer (3) is defined as content (3) with respect to 100 parts by weight of the thermoplastic resin (3) (in the case where the thermoplastic resin (3) is a polyvinyl acetal resin (3), 100 parts by weight of the polyvinyl acetal resin (3)). The content (2) and the content (3) are each preferably 5 parts by weight or more, more preferably 10 parts by weight or more, further preferably 15 parts by weight or more, further preferably 20 parts by weight or more, particularly preferably 24 parts by weight or more, and most preferably 25 parts by weight or more. The content (2) and the content (3) are each preferably 45 parts by weight or less, more preferably 40 parts by weight or less, still more preferably 35 parts by weight or less, particularly preferably 32 parts by weight or less, and most preferably 30 parts by weight or less. When the content (2) and the content (3) are not less than the lower limit, the flexibility of the interlayer film is improved, and the interlayer film can be easily handled. When the content (2) and the content (3) are not more than the upper limit, the penetration resistance of the laminated glass is further improved.

From the viewpoint of effectively improving the sound-insulating property of the laminated glass, the content (1) is preferably higher than the content (2), and the content (1) is preferably higher than the content (3).

From the viewpoint of further improving the sound-insulating property of the laminated glass, the absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and still more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 80 parts by weight or less, more preferably 75 parts by weight or less, and still more preferably 70 parts by weight or less.

From the viewpoint of satisfactory sound insulation after a certain period of time has elapsed from the production of the intermediate film, the intermediate film preferably satisfies the following composition (a1) and composition (a 2). Constitution (a 1): the plasticizer (2) in the 2 nd layer having the highest content is the same as the plasticizer (1) in the 1 st layer having the highest content. Constitution (a 2): a combination of the plasticizer (2) having the largest content in the plasticizer (2) in the 2 nd layer, the thermoplastic resin (2) in the 2 nd layer, the plasticizer (1) having the largest content in the plasticizer (1) in the 1 st layer, and the polyvinyl acetate (1) in the 1 st layer satisfies the following configuration (a).

Constitution (a): the cloud point (2) is determined by using a liquid obtained by mixing 8 parts by weight of the thermoplastic resin (2) in the 2 nd layer with 100 parts by weight of the plasticizer (2) having the largest content in the 2 nd layer. The cloud point (1) is determined as the cloud point (1) measured for a liquid obtained by mixing 8 parts by weight of the polyvinyl acetate (1) in the first layer with 100 parts by weight of the plasticizer (1) contained in the largest amount in the first layer (1). Cloud point (2) is higher than cloud point (1) by 30 ℃ or higher.

In the above-described configuration, the cloud point (2) is more preferably higher than the cloud point (1) by 40 ℃ or more, and still more preferably higher by 50 ℃ or more, from the viewpoint of improving the sound insulation property after a certain period of time has elapsed from the production of the intermediate film.

From the viewpoint of satisfactory sound insulation after a certain period of time has elapsed from the production of the intermediate film, the intermediate film preferably satisfies the following composition (B1) and composition (B2). Constitution (B1): the plasticizer (3) in the 3 rd layer has the highest content and the plasticizer (1) in the 1 st layer has the highest content. Constitution (B2): the combination of the plasticizer (3) having the largest content in the plasticizer (3) in the 3 rd layer, the thermoplastic resin (3) in the 3 rd layer, the plasticizer (1) having the largest content in the plasticizer (1) in the 1 st layer, and the polyvinyl acetate (1) in the 1 st layer satisfies the following configuration (b).

Constitution (b): the cloud point (3) is determined by using a liquid obtained by mixing 8 parts by weight of the thermoplastic resin (3) in the 3 rd layer with 100 parts by weight of the plasticizer (3) having the largest content in the 3 rd layer. The cloud point (1) is determined as the cloud point (1) measured for a liquid obtained by mixing 8 parts by weight of the polyvinyl acetate (1) in the first layer with 100 parts by weight of the plasticizer (1) contained in the largest amount in the first layer (1). Cloud point (3) is higher than cloud point (1) by 30 ℃ or higher.

In the above-described configuration, the cloud point (3) is more preferably higher than the cloud point (1) by 40 ℃ or more, and still more preferably higher by 50 ℃ or more, from the viewpoint of improving the sound insulation property after a certain period of time has elapsed from the production of the intermediate film.

The cloud point is the temperature at which turbidity occurs.

The cloud point is a cloud point determined based on JIS K2266 "pour point of crude oil and petroleum product and cloud point test method of petroleum product". The cloud point measured using the thermoplastic resin and the plasticizer is specifically measured in the following manner.

3.5g (100 parts by weight) of a plasticizer and 0.28g (8 parts by weight) of a thermoplastic resin or polyvinyl acetate were prepared. In a test tube (diameter 2cm), 3.5g (100 parts by weight) of the plasticizer and 0.28g (8 parts by weight) of the thermoplastic resin or polyvinyl acetate were mixed. A liquid obtained by mixing the thermoplastic resin or polyvinyl acetate in the plasticizer is heated to 180 ℃. Next, the test tube was placed under an atmosphere of-20 ℃ and the temperature of the liquid was lowered to-15 ℃. The cloud point indicates the temperature at which the liquid is cloudy (cloud point determination method 1).

Examples of the method for measuring the temperature at which the liquid is cloudy (cloud point) include: a method of observing the appearance of a liquid by the naked eye; a method of measuring the haze of a liquid by a haze meter; and a method of preparing a limit sample relating to a plurality of stages of turbidity in advance and judging turbidity by comparison with the limit sample. Preferably by visual inspection of the appearance of the liquid. When the haze of a liquid is measured by a haze meter, the cloud point is defined as the temperature at which the haze is 10% or more.

In order to determine the temperature at which turbidity occurs with further high accuracy, the following measurement method can be used.

3.5g (100 parts by weight) of a plasticizer and 0.28g (8 parts by weight) of a thermoplastic resin or polyvinyl acetate were prepared. In a test tube (diameter 2cm), 3.5g (100 parts by weight) of the plasticizer and 0.28g (8 parts by weight) of the thermoplastic resin were mixed. A liquid obtained by mixing the thermoplastic resin or polyvinyl acetate in the plasticizer is heated to 180 ℃. Next, for the liquid heated to 180 ℃, the test tube was placed in a constant temperature chamber at a given temperature for 1 hour. The temperature of the thermostatic chamber was maintained and the haze of the liquid in the test tube was measured by a haze meter. The minimum value of the storage temperature in the thermostatic chamber having a haze of 10% or more is defined as the cloud point (cloud point determination method 2). For example, after the test tube was left in thermostatic chambers of 155 ℃, 150 ℃ and 145 ℃ for 1 hour, respectively, the temperature of the thermostatic chamber was maintained and the haze of the liquid in the test tube was measured by a haze meter. The cloud point can be specifically determined by changing the storage temperature.

(Heat insulating Material)

The intermediate film may contain a heat insulating substance. The 1 st layer may contain a thermally insulating substance. The 2 nd layer may contain a heat insulating substance. The 3 rd layer may contain a heat insulating substance. The heat insulating material may be used alone in1 kind or in combination of 2 or more kinds.

The heat insulating substance may include at least 1 component X of phthalocyanine compounds, naphthalocyanine compounds, and anthracyanine compounds, or heat insulating particles. In this case, the heat insulating substance may contain both the component X and the heat insulating particles.

The intermediate film may contain at least 1 component X of a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound. The 1 st layer may contain the component X. The 2 nd layer may contain the component X. The 3 rd layer may contain the component X. The component X is a heat-insulating substance. The component X may be used alone in1 kind or in combination of 2 or more kinds.

The component X is not particularly limited. As the component X, conventionally known phthalocyanine compounds, naphthalocyanine compounds and anthracene phthalocyanine compounds can be used.

Examples of the component X include phthalocyanine, phthalocyanine derivatives, naphthalocyanine derivatives, anthracyanine and anthracyanine derivatives. The phthalocyanine compound and the derivative of phthalocyanine each preferably have a phthalocyanine skeleton. The naphthalocyanine compound and the derivative of naphthalocyanine each preferably have a naphthalocyanine skeleton. The anthracene phthalocyanine compound and the derivative of anthracene phthalocyanine each preferably have an anthracene phthalocyanine skeleton.

The component X may contain a vanadium atom or a copper atom. The component X may contain a vanadium atom and may contain a copper atom. The component X may be at least 1 of phthalocyanine containing a vanadium atom or a copper atom and a derivative of phthalocyanine containing a vanadium atom or a copper atom.

The intermediate film may include thermal insulating particles. The layer 1 may comprise the insulating particles. The 2 nd layer may comprise the thermal insulating particles. The 3 rd layer may comprise the thermal insulating particles. The heat insulation particles are heat insulation substances. By using the heat insulating particles, infrared rays (heat rays) can be effectively blocked. The heat insulating particles may be used in only 1 kind or in combination of 2 or more kinds.

As the heat insulating particles, metal oxide particles may be used. As the heat insulating particles, particles formed of an oxide of a metal (metal oxide particles) can be used.

Infrared rays having a wavelength longer than that of visible light, i.e., 780nm or more, have smaller energy than ultraviolet rays. However, infrared rays have a large thermal action, and are emitted as heat when absorbed by a substance. Therefore, the infrared ray is generally called a hot ray. By using the heat insulating particles, infrared rays (heat rays) can be effectively blocked. The heat insulating particles are particles that absorb infrared rays.

Specific examples of the heat-insulating particles include: aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles (IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, tin-doped indium oxide particles (ITO particles), tin-doped zinc oxide particles, silicon-doped zinc oxide particlesMetal oxide particles such as particles, lanthanum hexaboride (LaB)₆) Particles, and the like. Insulating particles other than these may be used.

(Metal salt)

The intermediate film may contain at least 1 metal salt (hereinafter, sometimes referred to as metal salt M) of an alkali metal salt, an alkaline earth metal salt, and a magnesium salt. The 1 st layer may include the metal salt M. The 2 nd layer may include the metal salt M. The 3 rd layer may include the metal salt M. The use of the metal salt M facilitates control of the adhesiveness between the interlayer and a laminated glass member such as a glass plate or the adhesiveness between the interlayer and each other. The metal salt M may be used alone in1 kind or in combination of 2 or more kinds.

The metal salt M may contain at least 1 metal selected from Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba.

The metal salt M may be an alkali metal salt of an organic acid having 2 to 16 carbon atoms, an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms, or a magnesium salt of an organic acid having 2 to 16 carbon atoms.

Examples of the magnesium carboxylate having 2 to 16 carbon atoms and the potassium carboxylate having 2 to 16 carbon atoms include magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, potassium 2-ethylbutyrate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate.

(ultraviolet screening agent)

The intermediate film may include an ultraviolet shielding agent. The 1 st layer may contain an ultraviolet shielding agent. The 2 nd layer may contain an ultraviolet shielding agent. The 3 rd layer may contain a uv-screening agent. By using the ultraviolet shielding agent, the visible light transmittance is further reduced less even if the interlayer film and the laminated glass are used for a long period of time. The ultraviolet screening agent may be used alone in1 kind or in combination of 2 or more kinds.

The ultraviolet screening agent contains an ultraviolet absorber. The ultraviolet screening agent is preferably an ultraviolet absorber.

Examples of the ultraviolet shielding agent include an ultraviolet shielding agent containing a metal atom, an ultraviolet shielding agent containing a metal oxide, an ultraviolet shielding agent having a benzotriazole structure (benzotriazole compound), an ultraviolet shielding agent having a benzophenone structure (benzophenone compound), an ultraviolet shielding agent having a triazine structure (triazine compound), an ultraviolet shielding agent having a malonate structure (malonate compound), an ultraviolet shielding agent having an oxalic anilide structure (oxalic anilide compound), and an ultraviolet shielding agent having a benzoate structure (benzoate compound).

Examples of the ultraviolet shielding agent containing a metal atom include platinum particles, particles in which the surface of platinum particles is coated with silica, palladium particles, and particles in which the surface of palladium particles is coated with silica. The ultraviolet shielding agent is preferably not a heat insulating particle.

Examples of the ultraviolet shielding agent containing a metal oxide include zinc oxide, titanium oxide, and cerium oxide. Further, in the case of the ultraviolet shielding agent containing a metal oxide, the surface may be coated. Examples of the coating material for the surface of the ultraviolet shielding agent containing a metal oxide include an insulating metal oxide, a hydrolyzable organosilicon compound, and a polysiloxane compound.

Examples of the insulating metal oxide include silica, alumina, zirconia, and the like. The insulating metal oxide has a band gap energy of, for example, 5.0eV or more.

Examples of the ultraviolet-screening agent having a benzotriazole structure include: 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole ("Tinuvin P" manufactured by BASF corporation), 2- (2 '-hydroxy-3', 5 '-di-tert-butylphenyl) benzotriazole ("Tinuvin 320" manufactured by BASF corporation), 2- (2' -hydroxy-3 '-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF corporation), and 2- (2' -hydroxy-3 ', 5' -dipentylphenyl) benzotriazole ("Tinuvin 328" manufactured by BASF corporation).

Examples of the ultraviolet shielding agent having a benzophenone structure include OCTABENZONE ("Chimassorb 81" manufactured by BASF corporation).

Examples of the ultraviolet-screening agent having a triazine structure include "LA-F70" manufactured by ADEKA, 2- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -5- [ (hexyl) oxy ] -phenol ("Tinuvin 1577 FF" manufactured by BASF), and the like.

Examples of the ultraviolet-screening agent having a malonate structure include dimethyl 2- (p-methoxybenzylidene) malonate, tetraethyl 2,2- (1, 4-phenylenedimethylene) bismalonate, and 2- (p-methoxybenzylidene) -bis (1,2,2,6, 6-pentamethyl-4-piperidyl) malonate.

Examples of commercially available products of the above-mentioned ultraviolet screening agents having a malonate structure include Hostavin B-CAP, Hostavin PR-25 and Hostavin PR-31 (both manufactured by CLARIANT Co., Ltd.).

Examples of the ultraviolet-screening agent having an oxalic acid aniline structure include: oxalic acid diamides having an aryl group substituted on a nitrogen atom, such as N- (2-ethylphenyl) -N ' - (2-ethoxy-5-tert-butylphenyl) oxalic acid diamide, N- (2-ethylphenyl) -N ' - (2-ethoxy-phenyl) oxalic acid diamide, and 2-ethyl-2 ' -ethoxy-oxyaniline ("Sanduvor VSU" manufactured by CLARIANT).

Examples of the ultraviolet-screening agent having a benzoate structure include 2, 4-di-tert-butylphenyl-3, 5-di-tert-butyl-4-hydroxybenzoate ("Tinuvin 120" manufactured by BASF corporation) and the like.

(antioxidant)

The intermediate film may comprise an antioxidant. The layer 1 may comprise an antioxidant. The 2 nd layer may comprise an antioxidant. The 3 rd layer may comprise an antioxidant. The antioxidant may be used in1 kind alone or in combination of 2 or more kinds.

Examples of the antioxidant include a phenol-based antioxidant, a sulfur-based antioxidant, and a phosphorus-based antioxidant. The phenolic antioxidant is an antioxidant with a phenolic skeleton. The sulfur antioxidant is an antioxidant containing a sulfur atom. The phosphorus antioxidant is an antioxidant containing a phosphorus atom.

Examples of the phenolic antioxidant include: 2, 6-di-t-butyl-p-cresol (BHT), Butylhydroxyanisole (BHA), 2, 6-di-t-butyl-4-ethylphenol, stearyl- β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, 2 ' -methylenebis- (4-methyl-6-butylphenol), 2 ' -methylenebis- (4-ethyl-6-t-butylphenol), 4 ' -butylidene-bis- (3-methyl-6-t-butylphenol), 1, 3-tris- (2-methyl-hydroxy-5-t-butylphenyl) butane, tetrakis [ methylene-3- (3 ', 5 ' -butyl-4-hydroxyphenyl) propionate ] methane, tetrahydroxytoluene (BHA), Butylhydroxyanisole (BHA), 2, 6-di-t-butyl-4-ethylphenol, stearyl- β - (3, 5-di, 1,3, 3-tris- (2-methyl-4-hydroxy-5-tert-butylphenol) butane, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, ethylene glycol bis (3, 3' -tert-butylphenol) butyrate, and ethylene bis (oxyethylene) bis (3-tert-butyl-4-hydroxy-5-methylpropanoic acid), and the like. It is preferable to use 1 or 2 or more of these antioxidants.

Examples of the phosphorus-based antioxidant include: tridecyl phosphite, triphenyl phosphite, trisnonylphenyl phosphite, bis (tridecyl) pentaerythritol diphosphite, bis (decyl) pentaerythritol diphosphite, tris (2, 4-di-tert-butylphenyl) phosphite, bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite, and 2, 2' -methylenebis (4, 6-di-tert-butyl-1-phenoxy) (2-ethylhexyloxy) phosphorus. It is preferable to use 1 or 2 or more of these antioxidants.

Examples of commercially available products of the antioxidant include: "IRGANOX 245" manufactured by BASF, "IRGAFOS 168" manufactured by BASF, "IRGAFOS 38" manufactured by BASF, "SUMILIZERBHT" manufactured by Sumitomo chemical industry, "H-BHT" manufactured by Sakai chemical industry, and "IRGANOX 1010" manufactured by B ASF.

(other Components)

The intermediate film, the 1 st layer, the 2 nd layer, and the 3 rd layer may contain additives such as a coupling agent, a dispersant, a surfactant, a flame retardant, an antistatic agent, a pigment, a dye, an adhesion adjuster other than a metal salt, a moisture resistant agent, a fluorescent whitening agent, and an infrared absorber, as required. These additives may be used alone in1 kind or in combination of 2 or more kinds.

(other details of the intermediate film)

The thickness of the intermediate film is not particularly limited. From the viewpoint of practical use and from the viewpoint of sufficiently improving penetration resistance and bending rigidity of the laminated glass, the thickness of the interlayer film is preferably 0.1mm or more, more preferably 0.25mm or more, preferably 3mm or less, and more preferably 1.5mm or less. When the thickness of the interlayer film is not less than the lower limit, penetration resistance and bending rigidity of the laminated glass are further improved. When the thickness of the interlayer film is not more than the upper limit, the transparency of the interlayer film becomes further excellent.

The thickness of the interlayer film was T. The thickness of the 1 st layer is preferably 0.035T or more, more preferably 0.0625T or more, further preferably 0.1T or more, preferably 0.4T or less, more preferably 0.375T or less, further preferably 0.25T or less, and particularly preferably 0.15T or less. When the thickness of the 1 st layer is 0.4T or less, the bending rigidity is further improved.

The thickness of each of the 2 nd layer and the 3 rd layer is preferably 0.3T or more, more preferably 0.3125T or more, further preferably 0.375T or more, preferably 0.97T or less, more preferably 0.9375T or less, and further preferably 0.9T or less. The thicknesses of the 2 nd layer and the 3 rd layer may be 0.46875T or less, or 0.45T or less. When the thicknesses of the 2 nd layer and the 3 rd layer are not less than the lower limit and not more than the upper limit, the rigidity of the laminated glass is further improved.

The total thickness of the 2 nd layer and the 3 rd layer is preferably 0.625T or more, more preferably 0.75T or more, further preferably 0.85T or more, preferably 0.97T or less, more preferably 0.9375T or less, further preferably 0.9T or less. When the total thickness of the 2 nd layer and the 3 rd layer is not less than the lower limit and not more than the upper limit, the rigidity of the laminated glass is further improved.

The intermediate film may be a uniform thickness intermediate film or a variable thickness intermediate film. The cross-sectional shape of the intermediate film may be rectangular or wedge-shaped.

The method for producing the intermediate film of the present invention is not particularly limited. Examples of the method for producing an interlayer film of the present invention include: a method of forming each layer using each resin composition for forming each layer, and then laminating the obtained layers; and a method of laminating the respective layers by co-extruding the respective resin compositions for forming the respective layers using an extruder. Since the method is suitable for continuous production, a production method by extrusion molding is preferable.

From the viewpoint of excellent production efficiency of the intermediate film, it is preferable that the 2 nd layer and the 3 rd layer contain the same polyvinyl acetal resin. From the viewpoint of excellent production efficiency of the intermediate film, it is more preferable that the 2 nd layer and the 3 rd layer contain the same polyvinyl acetal resin and the same plasticizer. From the viewpoint of excellent production efficiency of the intermediate film, it is more preferable that the 2 nd layer and the 3 rd layer are formed of the same resin composition.

The intermediate film preferably has a concavo-convex shape on at least one of both surfaces. The intermediate film more preferably has a concavo-convex shape on both surfaces. The method for forming the above-described uneven shape is not particularly limited, and examples thereof include lip embossing, embossing roll method, calender roll method, profile extrusion method, and the like. The embossing roll method is preferable because a plurality of concave and convex shapes can be quantitatively formed as a certain concave and convex pattern.

(laminated glass)

Fig. 3 is a cross-sectional view schematically showing an example of a laminated glass using the interlayer film for laminated glass shown in fig. 1.

The laminated glass 31 shown in fig. 3 includes the 1 st laminated glass member 21, the 2 nd laminated glass member 22, and the interlayer film 11. The interlayer film 11 is disposed and sandwiched between the 1 st laminated glass member 21 and the 2 nd laminated glass member 22.

The 1 st laminated glass member 21 is laminated on the 1 st surface 11a of the interlayer film 11. The 2 nd laminated glass member 22 is laminated on the 2 nd surface 11b of the interlayer film 11 opposite to the 1 st surface 11 a. The 1 st laminated glass member 21 is laminated on the 2 nd layer 2. The 2 nd laminated glass member 22 is laminated on the 2 nd surface 11b of the interlayer film 11A opposite to the 1 st surface 11A.

Fig. 4 is a cross-sectional view schematically showing an example of a laminated glass using the interlayer film for a laminated glass shown in fig. 2.

The laminated glass 31A shown in fig. 4 includes the 1 st laminated glass member 21, the 2 nd laminated glass member 22, and the interlayer film 11A. The interlayer film 11A is disposed and sandwiched between the 1 st laminated glass member 21 and the 2 nd laminated glass member 22.

The 1 st laminated glass member 21 is laminated on the 1 st surface 11A of the interlayer film 11A. The 2 nd laminated glass member 22 is laminated on the 2 nd surface 11b of the interlayer film 11A opposite to the 1 st surface 11A.

As described above, the laminated glass of the present invention includes the 1 st laminated glass member, the 2 nd laminated glass member, and the interlayer film, which is the interlayer film for laminated glass of the present invention. In the laminated glass of the present invention, the interlayer film is disposed between the 1 st laminated glass member and the 2 nd laminated glass member.

The 1 st laminated glass member is preferably a1 st glass plate. The 2 nd laminated glass member is preferably a2 nd glass plate.

Examples of the 1 st and 2 nd laminated glass members include a glass plate and a PET (polyethylene terephthalate) film. The laminated glass includes not only a laminated glass in which an interlayer film is interposed between 2 glass plates but also a laminated glass in which an interlayer film is interposed between a glass plate and a PET film or the like. The laminated glass is a laminate comprising glass plates, and preferably at least 1 glass plate is used. The 1 st laminated glass member and the 2 nd laminated glass member are each a glass plate or a PET film, and the laminated glass preferably includes a glass plate as at least one of the 1 st laminated glass member and the 2 nd laminated glass member. In particular, both of the 1 st and 2 nd laminated glass members are preferably glass plates.

Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include a float glass plate, a heat ray absorbing glass plate, a heat ray reflecting glass plate, a polished glass plate, a mother glass, and a wired glass. The organic glass is synthetic resin glass which replaces inorganic glass. Examples of the organic glass include a polycarbonate plate and a poly (meth) acrylic resin plate. Examples of the poly (meth) acrylic resin plate include a poly (methyl (meth) acrylate plate and the like.

The thickness of each of the 1 st laminated glass member and the 2 nd laminated glass member is preferably 1mm or more, preferably 5mm or less, and more preferably 3mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 0.5mm or more, more preferably 0.7mm or more, preferably 5mm or less, and more preferably 3mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03mm or more, and preferably 0.5mm or less.

The glass plate may have a thickness of 2mm or less. The thickness of the glass plate may be 1.8mm or less, 1.6mm or less, and 1.0mm or less. When the thickness of the glass sheet is not more than the upper limit, the laminated glass can be reduced in weight, the material of the laminated glass can be reduced to reduce the environmental load, or the fuel efficiency of the vehicle can be improved by reducing the weight of the laminated glass to reduce the environmental load. The sum of the thickness of the 1 st glass plate and the thickness of the 2 nd glass plate may be 3.5mm or less, and may be 2.8mm or less. When the sum of the thickness of the 1 st glass plate and the thickness of the 2 nd glass plate is equal to or less than the upper limit, the laminated glass can be reduced in weight, the environmental load can be reduced by reducing the material of the laminated glass, or the fuel efficiency of the vehicle can be improved and the environmental load can be reduced by reducing the weight of the laminated glass.

The method for producing the laminated glass is not particularly limited. First, an interlayer film is interposed between the 1 st laminated glass member and the 2 nd laminated glass member. Next, air remaining between the 1 st laminated glass member, the 2 nd laminated glass member, and the interlayer film is degassed by, for example, pressing a roller or putting into a rubber bag and performing suction under reduced pressure. Then, pre-pressing at about 70 to 110 ℃ to obtain a laminate. Next, the laminate is placed in an autoclave or pressed, and press-bonded at about 120 to 150 ℃ and a pressure of 1 to 1.5 MPa. Thereby, a laminated glass can be obtained. In the production of the laminated glass, the 1 st, 2 nd and 3 rd layers may be laminated.

The interlayer film and the laminated glass can be used for vehicles, railway vehicles, spacecrafts, ships, buildings and the like. The interlayer film and the laminated glass can be used for other applications. The interlayer film and the laminated glass are preferably an interlayer film and a laminated glass for a vehicle or for a building, and more preferably an interlayer film and a laminated glass for a vehicle. The interlayer film and the laminated glass can be used for windshields, side glass, rear glass, roof glass and the like of vehicles. The interlayer film and the laminated glass are preferably used for vehicles. The intermediate film is used for obtaining laminated glass of a vehicle.

The present invention will be described in more detail below with reference to examples and comparative examples. The present invention is not limited to these examples.

The following materials were prepared.

In addition, the acetalization degree (butyralization degree), acetylation degree and hydroxyl group content of the polyvinyl acetal resin were measured by methods based on JIS K6728 "polyvinyl butyral test method". When measured by ASTM D1396-92, the same numerical values as those obtained by the method in accordance with JIS K6728 "polyvinyl butyral test method" are shown. In the case where the type of acetal is acetal or the like, the acetalization degree is calculated by measuring the acetylation degree and the content of hydroxyl groups, calculating the molar fraction from the obtained measurement results, and subtracting the acetylation degree and the content of hydroxyl groups from 100 mol%.

(resin)

Polyvinyl acetate:

polyvinyl acetate (1): synthesis example 1

(Synthesis example 1)

A polymerization vessel made of glass and provided with a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet was prepared. Into the polymerization vessel were charged 100 parts by weight of a vinyl acetate monomer, 1.0 part by weight of 3-methyl-3-buten-1-ol (M B), and 3.8 parts by weight of methanol, and the inside of the polymerization vessel was purged with nitrogen while heating and stirring. Then, 0.02 part by weight of t-butyl peroxyneodecanoate, 150 parts by weight of a vinyl acetate monomer and 1.5 parts by weight of 3-methyl-3-buten-1-ol (MB) as a polymerization initiator were added dropwise over 4 hours while setting the temperature in the polymerization vessel to 60 ℃, and after the dropwise addition was completed, the mixture was polymerized for 1 hour to obtain a solution containing polyvinyl acetate (1). The solution was dried in an oven at 110 ℃ for 3 hours to obtain polyvinyl acetate (1). In the polyvinyl acetate (1), the ratio (peak intensity of all peaks present at 0.06ppm to 0.3ppm inclusive/intensity of all peaks present at 4.5ppm to 5.3ppm inclusive) (peak ratio) is 0.042.

Polyvinyl acetate (2): synthesis example 2

(Synthesis example 2)

Polyvinyl acetate (2) was obtained in the same manner as in synthesis example 1, except that 3-methyl-3-buten-1-ol (MB) was changed to ethylene glycol monovinyl ether (HEVE), and the amount of the vinyl acetate monomer and ethylene glycol monovinyl ether (HEVE) were changed. In polyvinyl acetate (2), the peak ratio is 0.037.

Polyvinyl acetate (3): synthesis example 3

(Synthesis example 3)

Polyvinyl acetate (3) was obtained in the same manner as in synthesis example 1, except that 3-methyl-3-buten-1-ol (MB) was changed to ethylene glycol monovinyl ether (HEVE) and the amount of the vinyl acetate monomer and ethylene glycol monovinyl ether (HEVE) were changed. In polyvinyl acetate (3), the peak ratio was 0.02.

Polyvinyl acetate (4): synthesis example 4

(Synthesis example 4)

Polyvinyl acetate (4) was obtained in the same manner as in synthesis example 1, except that 3-methyl-3-buten-1-ol (MB) was changed to ethylene glycol monovinyl ether (HEVE) and the amount of the vinyl acetate monomer and ethylene glycol monovinyl ether (HEVE) were changed. In polyvinyl acetate (4), the peak ratio is 2.8.

Polyvinyl acetate (5): synthesis example 5

(Synthesis example 5)

Polyvinyl acetate (5) was obtained in the same manner as in synthesis example 1, except that 3-methyl-3-buten-1-ol (MB) was changed to monomethyl itaconate and the amount of the vinyl acetate monomer and monomethyl itaconate to be mixed was changed. In polyvinyl acetate (5), the peak ratio is 0.025.

Polyvinyl acetate (X1): synthesis example X1

(Synthesis example X1)

A polymerization vessel made of glass and provided with a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet was prepared. 250 parts by weight of vinyl acetate monomer and 3.8 parts by weight of methanol were charged into the polymerization vessel, and the inside of the polymerization vessel was purged with nitrogen while heating and stirring. Then, 0.02 part by weight of t-butyl peroxyneodecanoate as a polymerization initiator was added dropwise over 2.5 hours while setting the temperature in the polymerization vessel to 60 ℃, and after completion of the dropwise addition, polymerization was carried out for 2 hours to obtain a solution containing polyvinyl acetate (X1). The solution was dried in an oven at 110 ℃ for 3 hours to obtain polyvinyl acetate (X1).

Polyvinyl acetate (X2): synthesis example X2

(Synthesis example X2)

A polymerization vessel made of glass and provided with a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet was prepared. Into the polymerization vessel were charged 100 parts by weight of a vinyl acetate monomer, 0.3 parts by weight of ethylene glycol monovinyl ether and 3.8 parts by weight of methanol, and the inside of the polymerization vessel was purged with nitrogen while heating and stirring. Then, 0.02 part by weight of t-butyl peroxyneodecanoate, 150 parts by weight of a vinyl acetate monomer and 0.45 part by weight of 3-methyl-3-buten-1-ol as a polymerization initiator were added dropwise over 4 hours while setting the temperature in the polymerization vessel to 60 ℃, and after the addition was completed, the mixture was polymerized for 1 hour to obtain a solution containing polyvinyl acetate (X2). The solution was dried in an oven at 110 ℃ for 3 hours to obtain polyvinyl acetate (X2). In polyvinyl acetate (X2), the peak ratio was 0.01.

Polyvinyl acetate (X3): synthesis example X3

(Synthesis example X3)

A polymerization vessel made of glass and provided with a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet was prepared. Into the polymerization vessel, 100 parts by weight of a vinyl acetate monomer, 40 parts by weight of ethylene glycol monovinyl ether and 3.8 parts by weight of methanol were charged, and the inside of the polymerization vessel was purged with nitrogen while heating and stirring. Next, 0.02 part by weight of t-butyl peroxyneodecanoate, 150 parts by weight of a vinyl acetate monomer, and 60 parts by weight of 3-methyl-3-buten-1-ol (MB) as a polymerization initiator were added dropwise over 4 hours while setting the temperature in the polymerization vessel to 60 ℃, and after the addition was completed, the mixture was polymerized for 1 hour to obtain a solution containing polyvinyl acetate (X3). The solution was dried in an oven at 110 ℃ for 3 hours to obtain polyvinyl acetate (X3). In polyvinyl acetate (X3), the peak ratio was 4.0.

Polyvinyl acetal resin:

polyvinyl acetal resin (PVB in tables 1 and 2) (polymerization degree of 1700, hydroxyl content of 32 mol%, acetylation degree of 1 mol%, acetalization degree of 67 mol% using n-butyl aldehyde)

(plasticizer)

D931 (bis (2-butoxyethyl) adipate)

DBA (dibutyl glycol)

3GO (triethylene glycol di-2-ethylhexanoate)

(Metal salt M)

Mg mixture (50: 50 (weight ratio) mixture of magnesium 2-ethylbutyrate and magnesium acetate)

(ultraviolet screening agent)

Tinuvin326(2- (2 '-hydroxy-3' -tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, "Tinuvin 326" from BASF)

(antioxidant)

BHT (2, 6-di-tert-butyl-p-cresol)

(example 1)

Preparation of the composition for forming layer 1:

the following mixed components were mixed and sufficiently kneaded by a mixing roll to obtain a composition for forming the layer 1.

Polyvinyl acetate (1)100 parts by weight

Plasticizer (D931)70 parts by weight

An ultraviolet shielding agent (Tinuvin326) in an amount of 0.2% by weight in the obtained layer 1

An antioxidant (BHT) in an amount of 0.2 wt% in the obtained layer 1

Preparation of the compositions for forming the 2 nd and 3 rd layers:

the following mixed components were mixed and sufficiently kneaded by mixing rolls to obtain compositions for forming the 2 nd and 3 rd layers.

Polyvinyl Acetal resin (PVB)100 parts by weight

Plasticizer (D931)35 parts by weight

The amount of Mg in the obtained 2 nd and 3 rd layers was 70ppm, and a metal salt M (Mg mixture)

An ultraviolet shielding agent (Tinuvin326) in an amount of 0.2% by weight in the obtained 2 nd and 3 rd layers

An antioxidant (BHT) in an amount of 0.2 wt% in the obtained 2 nd and 3 rd layers

Preparing an intermediate film:

the obtained composition for forming the 1 st layer and the obtained compositions for forming the 2 nd and 3 rd layers were extruded through a co-extruder to obtain an intermediate film having a structure of the 2 nd layer (thickness 370 μm)/the 1 st layer (thickness 100 μm)/the 3 rd layer (thickness 370 μm).

Preparing the laminated glass:

the resulting intermediate film was cut into a size of 30cm in length by 2.5cm in width. Two glass plates (clear glass, length 30 cm. times. width 2.5c m. times. thickness 2.5mm) were prepared as the 1 st and 2 nd laminated glass members. An interlayer film was interposed between 2 glass plates to obtain a laminate. The laminate was placed in a rubber bag, degassed at a vacuum degree of 2.6kPa for 20 minutes, moved to an oven in a degassed state, held at 90 ℃ for 30 minutes, vacuum-pressed, and pre-laminated. The laminated body subjected to the preliminary press bonding was pressed in an autoclave at 135 ℃ and a pressure of 1.2MPa for 20 minutes to obtain a laminated glass.

(examples 2 to 9 and comparative examples 1 to 4)

A laminated glass was obtained in the same manner as in example 1, except that the kinds of polyvinyl acetate, polyvinyl acetal resin, and plasticizer, and the mixing amounts thereof were changed as shown in tables 1 and 2 below.

In example 7, 30 parts by weight of the plasticizer (D931) and 5 parts by weight of the plasticizer (DBA) were used as the plasticizers.

(evaluation)

(1)¹Measurement of H-NMR

After swelling 100mg of polyvinyl acetate with a small amount of chloroform, 250. mu.L of a trimethylsilylating agent (N, O-bis (trimethylsilyl) trifluoroacetamide: BSTFA) was added and stirred by a shaker for 1 hour. To the mixture was added 250. mu.L of deuterated chloroform solvent, and the mixture was further stirred with a shaker for 1 hour to obtain TMS-modified polyvinyl acetate.

Drying TMS polyvinyl acetate on a hot plate at 80 deg.C for 1 hr, further drying at 100 deg.C under vacuum for 1 hr, removing residual BSTFA, dissolving in deuterated chloroform, and making¹H-NMR measurement.

From the measurement results, the ratio (peak intensity of all peaks present at 0.06ppm to 0.3 ppm/intensity of all peaks present at 4.5ppm to 5.3 ppm) was determined (peak ratio).

(2) Cloud point

The evaluation of the cloud point was performed for a combination of a plasticizer which is common to and contained in the 1 st layer and the 2 nd layer, the thermoplastic resin (2) in the 2 nd layer, and the polyvinyl acetate (1) in the 1 st layer.

The cloud point was determined according to the 1 st cloud point determination method described in JIS K2266 "pour points of crude oils and petroleum products and cloud point test method for petroleum products". The results of cloud point (2) to cloud point (1) are described. Since the layer 2 is the same as the layer 3, the cloud point (3) -cloud point (1) results are the same as the cloud point (2) -cloud point (1) results.

(3) Adhesion force

The composition for forming the 1 st layer was coated on a PET film (thickness: 70 μm) subjected to corona treatment to form a1 st layer having a thickness of 100 μm, to obtain a1 st laminate.

The compositions for forming the 2 nd and 3 rd layers were coated on a PET film (thickness: 100 μm) to form a2 nd layer having a thickness of 370 μm, to obtain a2 nd laminate.

The 1 st and 2 nd laminates thus obtained were cut into a size of 25mm and 80mm, respectively, and the 1 st and 2 nd layers were opposed to each other and subjected to plastic sealing at 110 ℃. Test samples of PET film/layer 1/layer 2/PET film were obtained.

The obtained test sample was subjected to a 180-degree peel test at 25 ℃ at a tensile rate of 300 mm/min using a tensile tester, and the adhesion between the 1 st layer and the 2 nd layer (also corresponding to the 3 rd layer) was evaluated.

(4) Bending test

Test samples obtained in the evaluation of the adhesive strength in (3) above were prepared. The test sample was folded in half at 180 degrees and restored, and whether or not the portion of the fold line was peeled off was evaluated. In comparative example 1, peeling of 1cm occurred, whereas in example 2, peeling did not occur.

(5) Sound insulation (first loss factor at 20 ℃ C.)

The resulting laminated glass was left at room temperature (25 ℃ C.) for 2 weeks. The laminated glass after the placement was vibrated by a vibration generator (vibration generator G21-005D, manufactured by Shake Ltd.) used for the damping test. The vibration characteristics thus obtained were amplified by a mechanical impedance measuring apparatus ("XG-81" manufactured by RION), and the vibration spectrum was analyzed by an FFT spectrum Analyzer ("FFT Analyzer SA-01A 2" manufactured by RION).

The details and results are shown in tables 1 and 2 below.

Description of the symbols

1 st layer 1 …

1a … surface 1

1b … surface 2

2 layer 2 …

2a … outer side surface

3 layer 3 of 3 …

3a … outer side surface

11,11A … intermediate film

11a … surface 1

11b … No. 2 surface

21 … part of 1 st laminated glass

22 nd 22 … nd 2 nd laminated glass member

31,31A … laminated glass

51 … roll

61 … core