阅读说明：本技术 用于成型为成型体的树脂片用改性剂、树脂成型体用树脂片和树脂成型体 (Modifier for resin sheet for molding into molded body, resin sheet for resin molded body, and resin molded body ) 是由 小泽真贵子 常松麻美 小田英立 于 2019-07-16 设计创作，主要内容包括：本发明提供以良好的平衡发挥高温防雾性、高温防雾持续性和润滑性的树脂片用改性剂、树脂片和树脂成型体。树脂片用改性剂的特征在于,包含下述成分A和下述成分B,成分A/成分B=10/90~75/25(质量比),成分A：选自聚甘油脂肪酸酯、甘油脂肪酸酯、脱水山梨糖醇脂肪酸酯、聚氧乙烯烷基醚、聚亚烷基二醇中的一种以上；成分B：选自碳原子数为8~22的脂肪酸碱金属盐中的一种以上。(The invention provides a modifier for resin sheet, resin sheet and resin molded body which can exert high temperature antifogging property, high temperature antifogging persistence and lubricity with good balance. The modifier for a resin sheet is characterized by comprising the following component A and the following component B, wherein the component A/the component B = 10/90-75/25 (mass ratio), the component A: one or more selected from polyglycerin fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene alkyl ether and polyalkylene glycol; component B: at least one selected from fatty acid alkali metal salts having 8 to 22 carbon atoms.)

1. A modifier for a resin sheet for molding into a molded body, comprising a component A, a component B and a component C, wherein the component A/the component B = 29/71-63/37 in terms of mass ratio, and (component A + component B)/the component C = 40/60-70/30 in terms of mass ratio;

component A: at least one selected from esters of glycerol or condensates of glycerol having a condensation degree of 2-10 and fatty acids having 8-24 carbon atoms;

component B: more than one selected from fatty acid sodium salts with 8-18 carbon atoms;

component C: a vinyl copolymer having a number average molecular weight of 20000 to 90000, wherein the vinyl copolymer has 10 to 60 mass% of a structural unit 1 and 90 to 40 mass% of a structural unit 2, based on 100 mass% in total, the structural unit 1 is formed from a vinyl monomer represented by chemical formula 1, and the structural unit 2 is formed from another vinyl monomer copolymerizable with the vinyl monomer represented by chemical formula 1;

the structural units 2 each have, as the constituent units, the following components in a total amount of 100 mass% to the structural unit 1:

10 to 40 mass% of a structural unit composed of a hydroxyalkyl (meth) acrylate having a hydroxyalkyl group with 1 to 4 carbon atoms, and

10 to 70 mass% of a structural unit formed by alkyl (methyl) acrylate with alkyl of 1 to 4 carbon atoms;

[ chemical formula 1]

In the chemical formula 1, the metal oxide is represented by,

r1: a hydrogen atom or a methyl group;

r2: an alkylene group having 1 to 4 carbon atoms;

r3, R4: an alkyl group having 1 to 4 carbon atoms.

2. The modifier for resin sheet for molding into a molded body according to claim 1, wherein the ratio of component A, component B and component C in terms of mass ratio is (component A + component B)/component C =48/52 to 64/36.

3. A resin sheet for resin molding, which has a surface area of 5 to 200mg/m²The modifier for resin sheet for molding into a molded body according to any one of claims 1 or 2 is coated.

4. The resin sheet for resin molding according to claim 3, which is a polystyrene, polyester or polyolefin resin.

5. A molded article obtained by molding the resin sheet for resin molding according to claim 3 or 4.

Technical Field

The present invention relates to a modifier for a resin sheet for molding into a molded article having antifogging properties, a resin sheet for an antifogging resin molded article, and an antifogging resin molded article.

Background

A resin molded body widely used as a food container is hydrophobic, and therefore is easily fogged by moisture of the contents. Conventionally, resin molded articles have been used for the purpose of protecting commercial products, but in recent years, it has become important to be able to visually confirm contents without fogging, and particularly in food containers, demand for antifogging properties has increased. Among them, in the case where the contents are warm food, the force of sustaining the antifogging property is strongly required when the contents are packaged at high temperature and then displayed in a refrigerator for a long time.

Conventionally, as a method for imparting antifogging property to a resin sheet, a method of coating a polyglycerin fatty acid ester (refer to, for example, patent document 1), a method of coating a specific vinyl copolymer having a nitrogen-containing organic group in a side chain and a higher fatty acid salt (refer to, for example, patent document 2), a method of coating a polyglycerin fatty acid ester, a sucrose fatty acid ester, dimethylpolysiloxane (refer to, for example, patent document 3), and a method of coating a polyglycerin fatty acid ester, a sucrose fatty acid ester, and a silicone oil (refer to, for example, patent document 4) have been known.

Disclosure of Invention

Problems to be solved by the invention

However, although the resin molded body is subjected to a step of packaging the contents in a state where the molded bodies are overlapped with each other after molding, in the molding step and the packaging step, in order to prevent the overlapped resin molded bodies from being handled in a state where a plurality of the overlapped resin molded bodies are closely adhered, the individual molded bodies are easily separated, and excellent lubricity is also required.

The antifogging resin sheet proposed in the past cannot exhibit high-temperature antifogging property and high-temperature antifogging sustainability and lubricity for sustaining the high-temperature antifogging property for a long time in a good balance.

The present invention addresses the problem of providing a modifier for resin sheets, a resin sheet for resin molded bodies, and a resin molded body for molding into a molded body that exhibits high-temperature antifogging properties, high-temperature antifogging persistence properties, and lubricity in a good balance.

Means for solving the problems

The present invention relates to a modifier for a resin sheet for molding into a molded body, comprising a component A, a component B and a component C, wherein the component A/the component B = 29/71-63/37 (mass ratio), (component A + the component B)/the component C = 40/60-70/30 (mass ratio);

component A: at least one selected from the group consisting of glycerol and esters of glycerol condensates (condensation degree of 2-10) and fatty acids having 8-24 carbon atoms;

component B: more than one selected from fatty acid sodium salts with 8-18 carbon atoms;

component C: a vinyl copolymer having a number average molecular weight of 20000 to 90000, wherein the vinyl copolymer has 10 to 60 mass% of a structural unit 1 and 90 to 40 mass% of a structural unit 2, based on 100 mass% in total, the structural unit 1 is formed from a vinyl monomer represented by chemical formula 1, and the structural unit 2 is formed from another vinyl monomer copolymerizable with the vinyl monomer represented by chemical formula 1;

the structural units 2 each have, as the constituent units, the following components in a total amount of 100 mass% to the structural unit 1:

10 to 40 mass% of a structural unit composed of a hydroxyalkyl (meth) acrylate having a hydroxyalkyl group with 1 to 4 carbon atoms, and

10 to 70 mass% of a structural unit formed by (methyl) acrylic acid alkyl ester with C1-4 alkyl

[ chemical formula 1]

In the chemical formula 1, the metal oxide is represented by,

r1: a hydrogen atom or a methyl group;

r2: an alkylene group having 1 to 4 carbon atoms;

r3, R4: an alkyl group having 1 to 4 carbon atoms.

Examples of the fatty acid include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, sorbic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, undecylenic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, heneicosanoic acid, behenic acid, tricosanoic acid, lignoceric acid, oleic acid, linoleic acid, linolenic acid, erucic acid, 12-hydroxystearic acid, and ricinoleic acid. The fatty acid as the component A in the present invention is a fatty acid having 8 to 24 carbon atoms. Specific examples thereof include caprylic acid, pelargonic acid, capric acid, undecanoic acid, undecylenic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, heneicosanoic acid, behenic acid, tricosanoic acid, lignoceric acid, oleic acid, linoleic acid, linolenic acid, erucic acid, 12-hydroxystearic acid, ricinoleic acid, and the like.

The fatty acid to be used in the component A of the present invention is more preferably a fatty acid having 8 to 18 carbon atoms.

Component a may be a substance having at least 1 free hydroxyl group in the molecule of the partial ester.

For example,

(1) the partial ester of a condensation product of glycerin (condensation degree 2-10) and a fatty acid is exemplified by

Partial esters of diglycerol with caprylic acid, lauric acid, stearic acid, or oleic acid;

partial esters of tetraglycerol with lauric acid;

partial esters of hexaglycerol with stearic acid;

partial esters of decaglycerol with lauric, palmitic or stearic acid, and the like.

(2) Examples of partial esters of glycerol and fatty acids include

Partial esters of glycerol with caprylic acid, lauric acid, stearic acid, oleic acid, and the like.

Examples of the fatty acid metal salt include sodium caprylate, lithium caprylate, sodium laurate, potassium palmitate, sodium oleate, sodium stearate, potassium isostearate, and potassium behenate. The component B used in the present invention is a sodium salt of a fatty acid having 8 to 18 carbon atoms, and examples thereof include sodium octanoate, sodium laurate, sodium palmitoleate, sodium oleate, and sodium stearate.

The component C for the present invention is a vinyl copolymer having a number average molecular weight of 20000 to 90000, wherein the vinyl copolymer has 10 to 60 mass% of a structural unit 1 and 90 to 40 mass% of a structural unit 2, based on 100 mass% in total, the structural unit 1 is formed of a vinyl monomer represented by the following chemical formula 1, and the structural unit 2 is formed of another vinyl monomer copolymerizable with the vinyl monomer represented by the chemical formula 1;

the structural units 2 each have, as the constituent units, the following components in a total amount of 100 mass% to the structural unit 1:

10 to 40 mass% of a structural unit composed of a hydroxyalkyl (meth) acrylate having a hydroxyalkyl group with 1 to 4 carbon atoms, and

10 to 70 mass% of a structural unit formed by (methyl) acrylic acid alkyl ester with C1-4 alkyl.

The number average molecular weight can be measured by a known method using GPC (gel permeation chromatography).

[ chemical formula 1]

In the chemical formula 1, the metal oxide is represented by,

r1: a hydrogen atom or a methyl group;

r2: alkylene groups having 1 to 4 carbon atoms such as methylene, ethylene, trimethylene and tetramethylene;

r3, R4: and alkyl groups having 1 to 4 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and the like.

The component C can be synthesized by a known method. For example, the polymer can be synthesized by dissolving the structural unit 1 and the structural unit 2 in a solvent such as methanol, adding a radical polymerization initiator and a radical chain transfer agent as appropriate, and then performing a radical polymerization reaction at a radical polymerization temperature in a nitrogen atmosphere.

The structural unit 2 constituting the component C may be any of various known materials, and is preferably one or more selected from hydroxyalkyl (meth) acrylates having a hydroxyalkyl group having 1 to 4 carbon atoms and alkyl (meth) acrylates having an alkyl group having 1 to 4 carbon atoms.

Examples of the hydroxyalkyl (meth) acrylate having a hydroxyalkyl group having 1 to 4 carbon atoms include

Hydroxymethyl acrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, hydroxymethyl methacrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-dihydroxyethyl acrylate, 2, 3-dihydroxypropyl acrylate, 4-dihydroxybutyl acrylate, 2-dihydroxyethyl methacrylate, 2, 3-dihydroxypropyl methacrylate, 4-dihydroxybutyl methacrylate, and the like.

Among them, 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate are preferable.

Examples of the alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate.

Among them, ethyl acrylate and methyl methacrylate are preferable.

The modifier for resin sheets comprises a component A, a component B and a component C, wherein the component A/the component B = 29/71-63/37 (mass ratio), (the component A + the component B)/the component C = 40/60-70/30 (mass ratio).

The ratio of component a, component B and component C is preferably (component a + component B)/component C =48/52 to 64/36 (mass ratio).

In the present invention, a known resin sheet can be used as the resin sheet for resin molded bodies to which the modifier for resin sheet is to be applied. For example, there may be mentioned

1) Polystyrene resin sheets formed from polystyrene, styrene, seeding acrylonitrile copolymers, and the like;

2) polyester resin sheets formed from polyethylene terephthalate, polylactic acid, and the like, said polyethylene terephthalate being formed from ethylene glycol, a seed terephthalic acid copolymer, and the like;

3) polyvinyl chloride resin sheets formed from polyvinyl chloride, ethylene/vinyl chloride seed copolymers, and the like;

4) acrylic resin sheets formed from polymethyl methacrylate, methyl methacrylate, seeded styrene copolymers, and the like;

5) polyamide resin sheets made of 6-nylon, 6-nylon, or the like;

6) a polycarbonate resin sheet;

7) polyolefin resin sheets made of polyethylene, polypropylene, or the like.

The resin sheet for resin molded bodies of the present invention is preferably a polystyrene, polyester or polyolefin resin sheet.

The resin sheet for resin molded bodies can be molded by a known method, and examples thereof include an amorphous sheet, an unstretched sheet, a simultaneously biaxially stretched sheet, and a sequentially biaxially stretched sheet.

These resin sheets for resin molded bodies may be subjected to surface treatment such as corona treatment. The degree of corona treatment is not particularly limited, and the treatment is preferably carried out so as to achieve 35 to 70 mN/m.

As a method for applying the modifier for resin sheet of the present invention to a resin sheet, a known method can be used. For example, a method of coating a coating liquid prepared by dissolving a modifier for a resin sheet in a solvent by a spray coating method, a gravure roll coating method, an air knife coating method, a bar coating method, a kiss roll coating method, a flow coating method, a dip coating method, or the like can be mentioned. As the solvent, water, alcohol, toluene, ethyl acetate, and the like can be used alone or in combination. Among them, water or a mixture of water and an alcohol having 1 to 3 carbon atoms is preferably used.

The resin sheet is usually dried at 60 to 120 ℃ after the resin sheet modifier is applied.

As the resin sheet for resin molded bodies of the present invention,

preferably, the modifier for resin sheet is 5 to 200mg/m²Is coated on the surface.

However, the amount of application is not limited thereto.

The resin sheet for resin molded bodies of the present invention may be coated with a release agent such as silicone oil or polyolefin polymer, if necessary, in addition to the modifier for resin sheet. The release agent may be applied to either the surface of the resin sheet coated with the modifier or the opposite surface. When the release agent is applied to the surface coated with the resin sheet modifier, the release agent may be mixed with the resin sheet modifier in advance, or may be applied separately.

The present invention may be a resin molded article molded using the resin sheet for a resin molded article.

The resin molded article can be thermoformed into a container or the like according to the use. Examples of the thermoforming method include vacuum forming and compressed air forming. Examples of the resin molded article include lids and trays of containers for beverages and foods.

Effects of the invention

The present invention described above has the effect of providing a resin sheet for resin molded bodies that has excellent high-temperature antifogging properties, high-temperature antifogging durability, and lubricity.

Examples

Hereinafter, examples and the like are given to further illustrate the configuration and effects of the present invention, but the present invention is not limited to these examples. In the following examples, reference examples and comparative examples, parts are parts by mass and% is% by mass.

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