阅读说明：本技术 树脂组合物 (Resin composition ) 是由 金丸正实 藤井望 藤波弘树 古贺麻未 于 2019-02-25 设计创作，主要内容包括：树脂组合物,其为含有选自熔融吸热量(ΔH-D)小于3J/g的非晶性聚烯烃树脂(A-1)和高粘度油(A-2)中的至少1种、以及熔融吸热量(ΔH-D)为3~80J/g的聚丙烯系树脂(B)的树脂组合物,相对于前述非晶性聚烯烃树脂(A-1)、前述高粘度油(A-2)和前述聚丙烯系树脂(B)的合计量100质量%,合计包含5.0~99.5质量%的前述非晶性聚烯烃树脂(A-1)和前述高粘度油(A-2),包含0.5~95.0质量%的前述聚丙烯系树脂(B)。(A resin composition comprising at least 1 selected from an amorphous polyolefin resin (A-1) having a melting endothermic quantity (Delta H-D) of less than 3J/g and a high-viscosity oil (A-2), and a polypropylene resin (B) having a melting endothermic quantity (Delta H-D) of 3 to 80J/g, wherein the resin composition comprises 5.0 to 99.5 mass% of the amorphous polyolefin resin (A-1) and the high-viscosity oil (A-2) in total, and 0.5 to 95.0 mass% of the polypropylene resin (B) relative to 100 mass% of the total of the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2) and the polypropylene resin (B).)

1. A resin composition comprising at least 1 selected from an amorphous polyolefin resin (A-1) and a high-viscosity oil (A-2), and a polypropylene resin (B), wherein the amorphous polyolefin resin (A-1) has a melting endothermic amount (Delta H-D) of less than 3J/g, which is obtained from a melting endothermic curve obtained by holding a sample in a nitrogen atmosphere for 5 minutes at-10 ℃ using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute, and the polypropylene resin (B) has a melting endothermic amount (Delta H-D) of 3J/g to 80J/g, which is obtained from a melting endothermic curve obtained by holding a sample in a nitrogen atmosphere for 5 minutes at-10 ℃ using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute,

the non-crystalline polyolefin resin (A-1) and the high-viscosity oil (A-2) are contained in a total amount of 5.0 to 99.5 mass% with respect to 100 mass% of the total amount of the non-crystalline polyolefin resin (A-1), the high-viscosity oil (A-2), and the polypropylene-based resin (B) is contained in an amount of 0.5 to 95.0 mass%.

2. The resin composition according to claim 1, wherein the polypropylene-based resin (B) satisfies the following (1):

(1) a melting point (Tm-D) defined as a peak top observed on the highest temperature side of a melting endothermic curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute is not observed or is 0 ℃ or more and 120 ℃ or less.

3. The resin composition according to claim 1 or 2, wherein the intrinsic viscosity [ η ] of the polypropylene-based resin (B) is not less than 0.01dL/g and not more than 2.00 dL/g.

4. The resin composition according to any one of claims 1 to 3, wherein the polypropylene resin (B) contains more than 0 mol% and 20 mol% or less of at least 1 structural unit selected from ethylene and a C4-30 α -olefin.

5. The resin composition according to any one of claims 1 to 4, wherein the amorphous polyolefin resin (A-1) comprises a structural unit derived from at least 1 selected from propylene, isobutylene and isoprene.

6. The resin composition according to any one of claims 1 to 5, further comprising a tackifier resin (C).

7. The resin composition according to any one of claims 1 to 6, further comprising a low viscosity oil (D).

8. The resin composition according to any one of claims 1 to 7, further comprising a wax (E).

9. The resin composition according to any one of claims 1 to 8, further comprising a polyolefin-based resin (F) which does not belong to any of the amorphous polyolefin resin (A-1) and the polypropylene-based resin (B).

10. The resin composition according to claim 9, wherein the polyolefin-based resin (F) has a melting endotherm (Δ H-D) of more than 80J/g, which is obtained from a melting endotherm obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute.

11. A hot-melt adhesive comprising the resin composition according to any one of claims 1 to 10.

Technical Field

The present invention relates to a resin composition, and more particularly, to a resin composition containing a specific amorphous polyolefin resin and/or a high-viscosity oil and a specific polypropylene resin.

Background

Butyl rubber (isobutylene-isoprene rubber) and polyisobutylene have low air permeability and are used for inner tubes and sealing materials. Since the strength is insufficient only in the case of butyl rubber or polyisobutylene, a resin composition containing various resins has been proposed (for example, see patent document 1).

However, the conventional resin compositions have a problem of insufficient adhesiveness. For example, patent document 1 has studied a composition of polyisobutylene and a polyethylene resin, but the adhesive strength of the composition is insufficient.

Disclosure of Invention

Problems to be solved by the invention

The problem to be solved by the present invention is to provide a resin composition having excellent adhesiveness.

Means for solving the problems

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that: the problem can be solved by the following invention. Namely, the present application relates to the following.

<1> a resin composition comprising at least 1 selected from an amorphous polyolefin resin (A-1) and a high viscosity oil (A-2), and a polypropylene resin (B), wherein the amorphous polyolefin resin (A-1) has a melting endothermic amount (Δ H-D) of less than 3J/g from a melting endothermic curve obtained by holding a sample in a nitrogen atmosphere for 5 minutes at-10 ℃ and then raising the temperature at 10 ℃/minute by using a Differential Scanning Calorimeter (DSC), and the polypropylene resin (B) has a melting endothermic amount (Δ H-D) of 3J/g or more and 80J/g or less from a melting endothermic curve obtained by holding a sample in a nitrogen atmosphere for 5 minutes at-10 ℃ and then raising the temperature at 10 ℃/minute by using a Differential Scanning Calorimeter (DSC),

the non-crystalline polyolefin resin (A-1) and the high-viscosity oil (A-2) are contained in a total amount of 5.0 to 99.5% by mass, and the polypropylene-based resin (B) is contained in an amount of 0.5 to 95.0% by mass, based on 100% by mass of the total amount of the non-crystalline polyolefin resin (A-1), the high-viscosity oil (A-2), and the polypropylene-based resin (B).

<2> the resin composition according to <1>, wherein the polypropylene-based resin (B) satisfies the following (1).

(1) A melting point (Tm-D) defined as a peak top observed on the highest temperature side of a melting endothermic curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute is not observed or is 0 ℃ or more and 120 ℃ or less.

<3> the resin composition according to <1> or <2>, wherein the polypropylene resin (B) has an intrinsic viscosity [. eta. ] of 0.01dL/g or more and 2.00dL/g or less.

<4> the resin composition according to any one of <1> to <3>, wherein the polypropylene resin (B) contains more than 0 mol% and 20 mol% or less of at least 1 structural unit selected from ethylene and an α -olefin having 4 to 30 carbon atoms.

<5> the resin composition according to any one of <1> to <4>, wherein the amorphous polyolefin resin (A-1) contains at least 1 structural unit derived from propylene, isobutylene, and isoprene.

<6> the resin composition according to any one of <1> to <5>, which further comprises a tackifier resin (C).

<7> the resin composition according to any one of <1> to <6> above, further comprising a low-viscosity oil (D).

<8> the resin composition according to any one of <1> to <7>, which further comprises a wax (E).

<9> the resin composition according to any one of <1> to <8>, which further comprises a polyolefin resin (F) that is not one of the amorphous polyolefin resin (A-1) and the polypropylene resin (B).

<10> the resin composition according to <9>, wherein the polyolefin resin (F) has a melting endotherm (. DELTA.H-D) of more than 80J/g, which is obtained from a melting endotherm curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute.

<11> a hot melt adhesive comprising the resin composition according to any one of <1> to <10 >.

ADVANTAGEOUS EFFECTS OF INVENTION

The resin composition of the present invention has excellent adhesiveness and is suitable for use as a hot melt adhesive.

Drawings

FIG. 1(a) is an explanatory view showing a method of measuring adhesive strength in examples.

FIG. 1(b) is an explanatory view showing a method of measuring adhesive strength in examples.

FIG. 1(c) is an explanatory view showing a method of measuring adhesive strength in examples.

Detailed Description

The resin composition of the present embodiment comprises at least 1 selected from an amorphous polyolefin resin (A-1) and a high-viscosity oil (A-2) having a melting endothermic quantity (Δ H-D) of less than 3J/g, and a polypropylene resin (B) having a melting endothermic quantity (Δ H-D) of 3 to 80J/g, and comprises 5.0 to 99.5 mass% of the amorphous polyolefin resin (A-1) and the high-viscosity oil (A-2) in total, and 0.5 to 95.0 mass% of the polypropylene resin (B) relative to 100 mass% of the total amount of the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2) and the polypropylene resin (B).

< amorphous polyolefin resin (A-1) >

The amorphous polyolefin resin (A-1) used in the present embodiment is amorphous. The "amorphous polyolefin resin" in the present invention means a resin having a melting endothermic amount (. DELTA.H-D) of less than 3J/g, which is obtained from a melting endothermic curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃ per minute.

The melting endotherm (. DELTA.H-D) was calculated as follows: the area enclosed by a line portion including a peak observed on the highest temperature side of a melting endothermic curve obtained by DSC measurement and a base line is calculated by using, as the base line, a line connecting a point on the low temperature side without a change in heat and a point on the high temperature side without a change in heat. The melting endotherm (. DELTA.H-D) can be controlled by appropriately adjusting the monomer concentration and the reaction pressure.

Further, it is preferable that the amorphous polyolefin resin (A-1) does not have a melting point (Tm-D) defined as the peak top of a peak observed on the highest temperature side of a melting endothermic curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute.

The amorphous polyolefin resin (A-1) preferably has a structure represented by the following formula (1).

[ solution 1]

[R¹And R²Each independently represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms. Wherein R is¹And R²Not simultaneously hydrogen atoms. The hydrocarbon group may be a straight chain or a branched chain]。

The amorphous polyolefin resin (A-1) preferably contains an olefin monomer having a quaternary carbon. Specifically, in the above formula (1), R¹And R²Preferably both represent hydrocarbyl groups. Herein, "quaternary carbon" refers to a carbon atom bonded to 4 carbon atoms.

The amorphous polyolefin resin (a-1) may contain a structural unit derived from ethylene, isoprene, maleic anhydride, styrene, α -methylstyrene, or the like, in addition to the structure represented by the above formula (1).

Further, the amorphous polyolefin resin (a-1) preferably contains a structural unit derived from at least 1 selected from the group consisting of propylene, isobutylene and isoprene.

Specific examples of the amorphous polyolefin resin (A-1) include atactic polypropylene, propylene/α -olefin copolymers, ethylene/propylene/α -olefin copolymers, polyisobutylene, isobutylene/isoprene copolymers, isobutylene/n-butene copolymers, isobutylene/maleic anhydride copolymers, ethylene/isobutylene copolymers, ethylene/propylene/isobutylene terpolymers, ethylene/styrene/isobutylene terpolymers, ethylene/α -methylstyrene/isobutylene terpolymers, propylene/isobutylene copolymers, styrene/isobutylene copolymers, and α -methylstyrene/isobutylene copolymers.

Commercially available products of the amorphous polyolefin resin (A-1) include "テトラックス" manufactured by JXTG エネルギー, "Indopol" manufactured by イネオス, and "タフセレン" manufactured by Sumitomo chemical Co.

< high viscosity oil (A-2) >

The "high-viscosity oil" in the present invention means an oil having a kinematic viscosity of 250cSt or more at 40 ℃.

The high-viscosity oil (a-2) is not particularly limited, and examples thereof include mineral oils such as paraffinic process oil, naphthenic process oil, and isoparaffinic oil, aromatic mineral oil hydrocarbons, synthetic resin hydrocarbons such as ethylene-propylene copolymer, polybutene, polybutadiene, and low-molecular-weight substances such as poly (α -olefin), fatty oil softeners such as alkylbenzene, castor oil, linseed oil, rapeseed oil, and coconut oil, and ester plasticizers such as dibutyl phthalate, dioctyl adipate, and dioctyl sebacate. Among them, mineral oil-based hydrocarbons, paraffin-based process oils, and naphthene-based process oils are preferably used. Particularly preferred is a paraffinic oil in which the number of carbon atoms of the paraffinic hydrocarbon is 50% of the total number of carbon atoms.

The kinematic viscosity at 40 ℃ of the high-viscosity oil (A-2) is usually 250cSt or more, preferably 300cSt or more, more preferably 330cSt or more, and further preferably 350cSt or more, and is preferably 10 ten thousand cSt or less, more preferably 5 ten thousand cSt or less, further preferably 1 ten thousand cSt or less, further preferably 5,000cSt or less, and particularly preferably 1,000cSt or less. If the kinematic viscosity at 40 ℃ is less than 250cSt, bleeding tends to occur, and if it is 10 ten thousand cSt or less, bleeding tends to occur. The kinematic viscosity is a value measured in accordance with ISO 3104.

Commercially available products of the high-viscosity oil (A-2) include "ダイアナプロセスオイル PW-380" and "ダイアナプロセスオイル PS-430" available from shinning corporation; "AP/E Core", "SpectraSyn" manufactured by ExxonMobil; "ルーカント" manufactured by Mitsui chemical corporation, "Synfluid" manufactured by シェブロン corporation, "Kaydol oil" manufactured by シェブロン USA corporation, "Licocene PPA 330 TP" manufactured by クラリアント corporation, and "Durasyn" manufactured by イネオス corporation (both trade names).

The total content of the amorphous polyolefin resin (A-1) and the high-viscosity oil (A-2) in the resin composition is 5.0 to 99.5 mass% based on 100 mass% of the total amount of the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2), and the polypropylene resin (B). If the content is less than 5.0% by mass, the interface strength may be lowered, and if the content exceeds 99.5% by mass, the strength of the composition itself may be lowered. From this viewpoint, the total content of the amorphous polyolefin resin (a-1) and the high-viscosity oil (a-2) is preferably 10% by mass or more, more preferably 15% by mass or more, further preferably 20% by mass or more, and further preferably 30% by mass or more, and is preferably 99% by mass or less, more preferably 95% by mass or less, further preferably 90% by mass or less, further preferably 85% by mass or less, and particularly preferably 75% by mass or less, based on 100% by mass of the total amount of the amorphous polyolefin resin (a-1), the high-viscosity oil (a-2), and the polypropylene-based resin (B).

< Polypropylene resin (B) >

The polypropylene-based resin (B) used in the present embodiment has a melting endotherm (Δ H-D) of 3J/g to 80J/g, which is obtained from a melting endotherm obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute. When the melting endotherm (. DELTA.H-D) is less than 3J/g, the strength of the composition itself becomes insufficient, and when it exceeds 80J/g, the interfacial adhesion strength may be lowered. From this viewpoint, the melting endotherm (Δ H-D) is preferably 20J/g or more, more preferably 25J/g or more, further preferably 27J/g or more, further preferably 30J/g or more, and preferably 50J/g or less, more preferably 45J/g or less, further preferably 40J/g or less.

The calculation of the melting endothermic amount (. DELTA.H-D) is the same as that described in the description of the amorphous polyolefin resin (A-1).

The polypropylene-based resin (B) preferably satisfies the following (1).

(1) A melting point (Tm-D) defined as a peak top observed on the highest temperature side of a melting endothermic curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute is not observed or is 0 ℃ or more and 120 ℃ or less.

From the viewpoint of improving the flexibility of the elastomer resin composition, the melting point (Tm-D) of the polypropylene resin (B) is preferably not observed or is 0 ℃ or more and 120 ℃ or less. When the melting point is observed, from the same viewpoint, it is more preferably 30 ℃ or more, further preferably 35 ℃ or more, and still more preferably 40 ℃ or more, and is more preferably 90 ℃ or less, further preferably 85 ℃ or less, still more preferably 80 ℃ or less, and still more preferably 70 ℃ or less.

The melting point can be controlled by appropriately adjusting the monomer concentration and the reaction pressure.

The intrinsic viscosity [ η ] of the polypropylene resin (B) is preferably 0.01dL/g or more, more preferably 0.10dL/g or more, even more preferably 0.30dL/g or more, even more preferably 0.40dL/g or more, and is preferably 2.00dL/g or less, more preferably 1.80dL/g or less, even more preferably 1.70dL/g or less, even more preferably 1.50dL/g or less, and even more preferably 1.00dL/g or less. By setting the intrinsic viscosity [ eta ] to 0.01dL/g or more, the miscibility of the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2), and the polypropylene resin (B) can be further improved. Further, workability can be further improved by setting the concentration to 2.00dL/g or less. This is also true for resin compositions containing a filler such as talc.

Incidentally, the intrinsic viscosity [ η ]]Reduced viscosity (η) was measured by a Ubbelohde viscometer in tetralin at 135 ℃_SPAnd/c) and calculated using the following formula (Hakins formula).

η_SP/c＝[η]＋K[η]²c

η_SPC (dL/g): reduced viscosity

[ η ] (dL/g): intrinsic viscosity

c (g/dL): viscosity of Polymer

K ═ 0.35 (hagins constant).

The molecular weight distribution (Mw/Mn) of the polypropylene-based resin (B) is preferably 3.0 or less, more preferably 2.8 or less, further preferably 2.6 or less, and further preferably 2.5 or less, and is preferably 1.5 or more, more preferably 1.6 or more, further preferably 1.7 or more, and further preferably 1.8 or more. When the molecular weight distribution (Mw/Mn) is within the above range, the flexibility of the resin composition can be further improved, and the stickiness of the resin composition can be further suppressed.

In the present embodiment, the molecular weight distribution (Mw/Mn) is a value calculated from a polystyrene-equivalent weight average molecular weight Mw and a number average molecular weight Mn measured by a Gel Permeation Chromatography (GPC) method.

The polypropylene-based resin (B) is not particularly limited if the melting endothermic amount (. DELTA.H-D) satisfies the above range, but is preferably a propylene-based polymer selected from, for example, a propylene homopolymer, a propylene-ethylene block copolymer, a propylene-butene block copolymer, a propylene- α -olefin block copolymer, a propylene-ethylene random copolymer, a propylene-butene random copolymer, a propylene-ethylene-butene ternary random copolymer, a propylene- α -olefin graft copolymer and the like, more preferably a propylene-based polymer selected from a propylene homopolymer, a propylene-ethylene random copolymer, a propylene-butene random copolymer, a propylene- α -olefin random copolymer, a propylene-ethylene-butene ternary random copolymer, further preferred is a propylene homopolymer.

When the polypropylene resin (B) is a copolymer, it is preferable that the polypropylene resin (B) contains more than 0 mol% and 20 mol% or less of at least 1 structural unit selected from ethylene and an α -olefin having 4 to 30 carbon atoms, from the viewpoints of suppressing generation of particles (ブツ) due to crosslinking and improving flexibility of the resin composition. From this viewpoint, it is more preferably 0.5 mol% or more, further preferably 1.0 mol% or more, and is more preferably 18.5 mol% or less, further preferably 15.0 mol% or less, and further preferably 10.0 mol% or less.

When the polypropylene-based resin (B) is a copolymer containing an olefin having 2 carbon atoms, the structural unit of the olefin having 2 carbon atoms (i.e., an ethylene monomer) is preferably more than 0 mol% and 20 mol% or less, more preferably more than 0 mol% and 18 mol% or less, still more preferably more than 0 mol% and 16 mol% or less, and still more preferably more than 0 mol% and 14 mol% or less. In the case of a copolymer containing an α -olefin having 4 or more carbon atoms, the content of the α -olefin having 4 or more carbon atoms is preferably more than 0 mol% and 30 mol% or less, more preferably more than 0 mol% and 25 mol% or less, and still more preferably more than 0 mol% and 20 mol% or less.

As the polypropylene-based resin (B), commercially available products can be used. Specific examples thereof include "S400", "S600" and "S901" of "L-MODU" (registered trademark) (manufactured by registered trademark of registered trade company, Inc.). Commercially available products of amorphous polyalphaolefin include REXtac, "REXtac" manufactured by LLC company, "Vestoplast" manufactured by エボニック company, "Eastoflex" manufactured by Eastman company, and "Aerfin" (both trade names). Commercially available propylene elastomers include "TafmerXM", "TafmerPN" and "TafmerSN" available from Mitsui chemical company; プライムポリマー, "プライム TPO"; ダウ "Versify" manufactured by ケミカル incorporated herein by reference; "Vistamaxx" manufactured by エクソンモービル, Linxar ", and" Licocene "manufactured by クラリアント; バセル, "Adflex" (trade name).

The polypropylene resin (B) can be obtained by polymerizing monomers in the presence of a polymerization catalyst such as a ziegler-natta type catalyst or a metallocene catalyst. Among these, the polypropylene resin (B) is preferably a polypropylene resin obtained by a metallocene catalyst. The metallocene catalyst is one of homogeneous catalysts, and the resulting polymer is a uniform polymer having a narrow molecular weight distribution and a narrow composition distribution.

The content of the polypropylene resin (B) in the resin composition is 0.5 to 95.0 mass% based on 100 mass% of the total amount of the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2) and the polypropylene resin (B). If the amount is less than 0.5% by mass, the strength of the composition itself may be lowered, and if the amount exceeds 95.0% by mass, the interfacial adhesion strength may be lowered. From this viewpoint, the content of the polypropylene-based resin (B) is preferably 1% by mass or more, more preferably 5% by mass or more, further preferably 10% by mass or more, further preferably 15% by mass or more, and particularly preferably 25% by mass, and is preferably 90% by mass or less, more preferably 85% by mass or less, further preferably 80% by mass or less, and further preferably 70% by mass or less, based on 100% by mass of the total amount of the amorphous polyolefin resin (a-1), the high-viscosity oil (a-2), and the polypropylene-based resin (B).

The total content of the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2) and the polypropylene resin (B) in the resin composition is preferably 50% by mass or more, more preferably 70% by mass or more, and still more preferably 75% by mass or more, based on 100% by mass of the resin composition.

(tackifying resin (C))

The resin composition of the present embodiment may further contain a tackifier resin (C).

Examples of the tackifier resin include resins which are solid, semisolid, or liquid at normal temperature, such as hydrogenated derivatives of aliphatic hydrocarbon petroleum resins, rosin derivative resins, polyterpene resins, petroleum resins, and oil-soluble phenol resins. These may be used alone or in combination of two or more. In the present invention, hydrogenated products are preferably used in view of compatibility with the matrix polymer. Among these, hydrogenated products of petroleum resins having excellent thermal stability are more preferable.

As commercially available tackifying resins, the following resins can be mentioned.

Examples of the thickener produced by using the raw material obtained in the purification process of crude oil and naphtha include "アイマーブ" (manufactured by Shikucheng chemical Co., Ltd), "アルコン" (manufactured by Mitsukawa chemical Co., Ltd), "クイントン" (manufactured by Japan ゼオン), "T-REZ" (manufactured by JXTG エネルギー Co., Ltd), "Escorez", "Oppera" (manufactured by ExxonMobil chemical Co., Ltd., "Eastotac", "Regalite", "Regalrez", "Plastolyn" (manufactured by Eastman Co., Ltd., "Sukolez" (manufactured by Kolon Co., Ltd.), and "Winggtn" and "Norsolene" (manufactured by Cray Valley Co., Ltd.) (both of them are trade names).

Examples of the thickener produced using an essential oil obtained from orange or the like as a raw material include "クリアロン" (manufactured by ヤ ス ハ ラ ケミカル corporation), and "Sylvalite" and "Sylvares" (manufactured by Arizona Chemical corporation) (both trade names).

Examples of the tackifier produced using a raw material such as rosin include "ハリタック" and "ネオトール" (ハリマ chemical industries, Ltd.), and "エステルガム" and "ペンセル" (available from Ishikawa chemical industries, Ltd.) (both trade names).

The content of the tackifier resin (C) in the resin composition of the present invention is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, further preferably 40 parts by mass or more, and still more preferably 50 parts by mass or more, and is preferably 200 parts by mass or less, more preferably 150 parts by mass or less, further preferably 120 parts by mass or less, and still more preferably 100 parts by mass or less, with respect to the total content 100 parts by mass of the amorphous polyolefin resin (a-1), the high-viscosity oil (a-2), and the polypropylene-based resin (B) in the resin composition, from the viewpoints of improving adhesiveness, coatability, and improving wettability to an adherend by lowering viscosity.

The softening point of the tackifier resin is not particularly limited, and when the softening point is too high, the viscosity of the hot melt adhesive at the time of application increases to deteriorate the applicability, and when the softening point is too low, the thermal stability of the hot melt adhesive deteriorates, and burning occurs in the furnace to adversely affect the adhesiveness and odor. For the above reasons, the softening point of the tackifier resin is preferably 80 ℃ or higher, more preferably 85 ℃ or higher, and further preferably 90 ℃ or higher, and is preferably 130 ℃ or lower, more preferably 120 ℃ or lower, and further preferably 110 ℃ or lower.

(Low-viscosity oil (D))

The resin composition of the present embodiment may further contain a low-viscosity oil (D). "Low viscosity oil" in the context of the present invention means an oil having a kinematic viscosity at 40 ℃ of less than 250 cSt.

Examples of the low-viscosity oil (D) include, but are not particularly limited to, paraffin-based process oils, naphthene-based process oils, mineral oils such as isoparaffin-based oils, aromatic-based mineral-oil-based hydrocarbons, synthetic resin-based hydrocarbons such as polybutene, polybutadiene, and poly (α -olefin) having a low molecular weight, fatty-oil-based softeners such as alkylbenzene, castor oil, linseed oil, rapeseed oil and coconut oil, and ester-based plasticizers such as dibutyl phthalate, dioctyl adipate, and dioctyl sebacate. Among them, mineral oil-based hydrocarbons, paraffin-based process oils, and naphthene-based process oils are preferably used. Particularly preferred is a paraffinic oil in which the number of carbon atoms of the paraffinic hydrocarbon is 50% of the total number of carbon atoms.

The weight average molecular weight of the mineral oil hydrocarbon is preferably 50 to 2,000, and particularly preferably 100 to 1,500. The low-viscosity oil (D) preferably has a kinematic viscosity at 40 ℃ of less than 250cSt, more preferably from 3 to 220cSt, in particular from 5 to 200 cSt. The kinematic viscosity is a value measured in accordance with ISO 3104.

Commercially available low-viscosity oil (D) includes "ダイアナプロセスオイル PW-32", "ダイアナプロセスオイル PW-90" (90cSt), "ダイアナプロセスオイル PW-150", "ダイアナプロセスオイル PS-32", "ダイアナプロセスオイル PS-90" and "ParaLuxoil" (trade names).

The content of the low-viscosity oil (D) in the resin composition of the present invention is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and preferably 200 parts by mass or less, more preferably 100% by mass or less, and even more preferably 50 parts by mass or less, based on 100 parts by mass of the total content of the amorphous polyolefin resin (a-1), the high-viscosity oil (a-2), and the polypropylene-based resin (B) in the resin composition, from the viewpoints of improving adhesiveness and coatability, and improving wettability to an adherend by reducing viscosity.

(wax (E))

The resin composition of the present embodiment may further contain a wax (E).

Examples of the wax include animal wax, vegetable wax, carnauba wax, candelilla wax, wood wax, beeswax, mineral wax, petroleum wax, paraffin wax, microcrystalline wax, vaseline, higher fatty acid wax, higher fatty acid ester wax, and fischer-tropsch wax.

Among these, the content of the wax (E) in the resin composition of the present invention is preferably less than 25 parts by mass, and more preferably not added, per 100 parts by mass of the total content of the amorphous polyolefin resin (a-1), the high-viscosity oil (a-2), and the polypropylene-based resin (B) in the resin composition, from the viewpoint of improving coatability. When the amount of wax added is large, the coatability is deteriorated.

(other additives)

The resin composition of the present embodiment may further contain various additives such as a plasticizer, an inorganic filler, and an antioxidant, as necessary.

Examples of the plasticizer include phthalate esters, adipate esters, fatty acid esters, glycols, epoxy polymer plasticizers, and the like.

Examples of the inorganic filler include talc, calcium carbonate, barium carbonate, wollastonite, silica, clay, mica, kaolin, titanium oxide, diatomaceous earth, urea resin, styrene beads, starch, barium sulfate, calcium sulfate, magnesium silicate, magnesium carbonate, alumina, and quartz powder.

Examples of the antioxidant include phosphorus-based antioxidants such as trisnonylphenyl phosphite, distearyl pentaerythritol diphosphite, "アデカスタブ 1178" (manufactured by ADEKA), "スタミライザー TNP" (manufactured by Sumitomo chemical Co., Ltd), "イルガフォス 168" (manufactured by BASF), "SandstabP-EPQ" (manufactured by サンド); phenol antioxidants such as 2, 6-di-t-butyl-4-methylphenol, n-octadecyl 3- (3',5' -di-t-butyl-4 ' -hydroxyphenyl) propionate, "スミライザー BHT" (manufactured by Sumitomo chemical Co., Ltd.), "イルガノックス 1010" (manufactured by BASF Co., Ltd.); and sulfur antioxidants such as dilauryl 3,3' -thiodipropionate, pentaerythritol tetrakis (3-laurylthiopropionate), "スミライザー TPL" (manufactured by Sumitomo chemical Co., Ltd), "DLTP" ヨシトミ "(manufactured by Mitsubishi chemical Co., Ltd.), and" アンチオックス L "(manufactured by Nikkiso Co., Ltd.).

Further, in the resin composition of the present embodiment, a crosslinking agent, a crosslinking assistant, or the like may be added to partially crosslink the resin composition.

Examples of the crosslinking agent include phenol-based sulfur-adding agents such as organic peroxides, sulfur compounds, and phenol resins. Among these, organic peroxides are preferable. Specific examples of the organic peroxide include 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane, 2, 5-dimethyl-2, 5-di (t-butylperoxy) -3-hexyne; 2, 5-dimethyl-2, 5-di (benzoylperoxy) hexane; tert-butyl peroxybenzoate; dicumyl peroxide; tert-butyl cumyl peroxide; dicumyl hydroperoxide; 1, 3-bis (tert-butylperoxyisopropyl) benzene; benzoyl peroxide; 1, 1-di (t-butylperoxy) -3,3, 5-trimethylcyclohexane, di-t-butyl peroxide, n-butyl 4, 4-bis (t-butylperoxy) valerate, p-chlorobenzoyl peroxide, 2, 4-dichlorobenzoyl peroxide, t-butylperoxyisopropyl carbonate, diacetyl peroxide, lauroyl peroxide, and the like. Among these, from the viewpoint of the odor property and the stability of scorch (スコーチ), 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane, 2, 5-dimethyl-2, 5-di (t-butylperoxy) -3-hexyne, 1, 3-bis (t-butylperoxyisopropyl) benzene, 1-bis (t-butylperoxy) -3,3, 5-trimethylcyclohexane, and n-butyl 4, 4-bis (t-butylperoxy) valerate are preferable, and among these, 1, 3-bis (t-butylperoxyisopropyl) benzene is most preferable.

Examples of the crosslinking assistant include N-methyl-N, 4-dinitrosoaniline, nitrosobenzene, diphenylguanidine, divinylbenzene, trimethylolpropane tri (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, allyl (meth) acrylate, diallyl phthalate, triallyl cyanurate, benzoquinone dioxime, p '-dibenzoylbenzoquinone dioxime, bismaleimide, phenylenebismaleimide, trimethylolpropane-N, N' -m-phenylenedimaleimide, polyethylene glycol dimethacrylate, vinyl butyrate, vinyl stearate, unsaturated silane compounds, sulfur, and the like. By using such a crosslinking assistant, a uniform and mild crosslinking reaction can be expected.

Among these crosslinking assistants, triallyl cyanurate, ethylene glycol dimethacrylate, divinylbenzene, and bismaleimide are preferable. These resins are easy to handle, have good compatibility with the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2) and the polypropylene resin (B) which are the main components of the crosslinked material, and have the function of solubilizing the organic peroxide, and function as a dispersant for the organic peroxide, so that a resin composition which has a uniform crosslinking effect by heat treatment and exhibits a balance between flexibility and physical properties can be obtained.

The crosslinking agent and the crosslinking assistant may be used in 1 kind, respectively, or in combination of 2 or more kinds.

When the crosslinking agent and the crosslinking assistant are used, the crosslinking degree can be adjusted as desired within a range of 0.1 to 5 parts by mass per 100 parts by mass of the total amount of the components (A-1), (A-2), (B) to (E).

When an unsaturated silane compound is used as the crosslinking aid, crosslinking can be further carried out by contacting with moisture in the presence of a silanol condensation catalyst.

The resin composition of the present embodiment may further contain a polyolefin resin (F) which is not either the amorphous polyolefin resin (a-1) or the olefin polymer (B), if necessary. Specifically, the polyolefin resin (F) is a polyolefin resin having a melting endothermic heat (Δ H-D) of more than 80J/g, which is obtained from a melting endothermic curve obtained by holding a sample at-10 ℃ for 5 minutes in a nitrogen atmosphere using a Differential Scanning Calorimeter (DSC) and then raising the temperature at 10 ℃/minute. Specific examples of the polyolefin resin (F) include polyethylene, polypropylene, ethylene/α -olefin copolymers, propylene/α -olefin copolymers, and the like. Examples of commercially available products of the polyolefin include "プライム ポ リ プ ロ Y-2045 GP" (propylene-ethylene copolymer) manufactured by プライムポリマー, for example.

[ method for producing resin composition ]

The resin composition of the present invention can be produced by dry-mixing at least 1 kind selected from the tackifier resin (C), the low-viscosity oil (D) and the wax (E) with the amorphous polyolefin resin (A-1), the high-viscosity oil (A-2) and the olefin polymer (B) using a Henschel mixer or the like, and further dry-mixing other various additives as necessary, and melt-kneading them by a single-screw or twin-screw extruder, プラストミル (Plastomill), a Banbury mixer or the like.

< Hot melt adhesive >

The hot melt adhesive of the present invention contains the above resin composition. The hot-melt adhesive of the present invention has excellent adhesiveness.