JP7223618B2 - Resin molded products for vehicle parts - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin molded product for a vehicle member that can be suitably used as a vehicle member such as an automobile interior material.

A resin composition such as a vinyl chloride resin composition is blended with a plasticizer to impart flexibility to a molded article formed from the resin composition. A resin molded article having such a flexible molded article as a skin layer, a core layer, and a polyurethane foam layer disposed between the skin layer and the core layer is used in automobiles such as instrument panels and door trims. is suitably used as a vehicle interior material.

However, in the case of a resin molded article containing a plasticizer in the skin layer, the plasticizer migrates to the polyurethane foam layer due to the effects of heat, light, etc., and the content of the plasticizer in the skin layer decreases. There were problems with curing and shrinkage. Patent Literature 1 proposes to prevent bleeding out of a plasticizer by forming a cured film of a fluorine-containing copolymer on the surface of a vinyl chloride resin molded article. JP-A-2003-200012 proposes surrounding the foam molecules of the foam layer with a coating agent that prevents the plasticizer from transferring to the foam layer.

JP-A-5-163456 JP 2016-113141 A

However, Patent Document 1 does not discuss the adhesion between the skin layer and the polyurethane foam layer. In Patent Document 2, it was necessary to further improve the heat aging resistance while increasing the adhesiveness between the skin layer and the polyurethane foam layer.

The present invention provides a resin molded article for a vehicle member, which has high adhesiveness between a skin layer containing a plasticizer and a polyurethane foam layer and has good heat aging resistance.

The present invention provides a resin molded article for a vehicle member having a skin layer, a core material layer, and a polyurethane foam layer between these layers, wherein the skin layer contains a plasticizer, and the skin layer and the polyurethane foam layer are separated from each other. An adhesive barrier layer composed of an acrylic resin containing a hydroxyl group is arranged between the adhesive barrier layers, and the acrylic resin containing a hydroxyl group contains 20% by mass or more of structural units derived from a (meth)acrylate having a hydroxyl group. The present invention relates to a resin molded product for a vehicle member containing 60% by mass or less and 40% by mass or more and 80% by mass or less of structural units derived from methyl (meth)acrylate.

In one or more embodiments of the present invention, the (meth)acrylates having a hydroxyl group are 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4- It preferably contains one or more hydroxyalkyl (meth)acrylates selected from the group consisting of hydroxybutyl acrylate.

In one or more embodiments of the present invention, the skin layer contains 110 parts by mass or more and 180 parts by mass or less of a plasticizer with respect to 100 parts by mass of the vinyl chloride resin (A) having an average particle size of 50 µm or more and 500 µm or less. It is preferable to include 4 parts by mass or more and 23 parts by mass or less of an acrylic polymer.

In one or more embodiments of the present invention, the acrylic polymer contains 40% by mass or more and 95% by mass or less of structural units derived from methyl (meth)acrylate and an aliphatic alcohol having 2 or more carbon atoms (meth ) At least one (meth)acrylic acid ester-derived structural unit selected from the group consisting of acrylic acid esters and aromatic alcohol (meth)acrylic acid esters is preferably contained in an amount of 5% by mass or more and 60% by mass or less.

In one or more embodiments of the present invention, the vinyl chloride resin (A) preferably has an average degree of polymerization of 1350 or more.

In one or more embodiments of the present invention, it is preferred that the core layer contains a polypropylene-based resin.

In one or more embodiments of the present invention, the resin molded product for vehicle members may be a vehicle interior material.

According to the present invention, it is possible to provide a resin molded product for a vehicle member in which the skin layer containing a plasticizer and the polyurethane foam layer have high adhesiveness and the skin layer has good heat aging resistance.

FIG. 1 is a schematic cross-sectional view of a resin molded product for vehicle members according to one or more embodiments of the present invention.

The inventors of the present invention have found that in a resin molded product for a vehicle member having a skin layer, a core layer, and a polyurethane foam layer between these layers, the adhesiveness between the skin layer and the polyurethane foam layer is increased, and plasticization by heat or the like is performed. Intensive studies were made on improving heat aging resistance by suppressing migration of the agent from the skin layer to the polyurethane foam layer. As a result, between the skin layer and the polyurethane foam layer, 20% by mass or more and 60% by mass or less of structural units derived from (meth)acrylate having a hydroxyl group and 40% by mass or more of structural units derived from methyl (meth)acrylate were found. By arranging an adhesion barrier layer composed of an acrylic resin containing hydroxyl groups containing 80% by mass or less, the adhesion between the skin layer containing the plasticizer and the polyurethane foam layer is high, and the plasticizer is transferred from the skin layer to the polyurethane foam layer. It was found that the heat aging resistance of the epidermis layer was improved by suppressing the migration to the outer layer.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings and the like, but the present invention is not limited to the embodiments described below.

FIG. 1 is a schematic cross-sectional view of a resin molded product for vehicle members according to one or more embodiments of the present invention. The resin molded product 1 for vehicle members of this embodiment has a structure in which a skin layer 2, an adhesive barrier layer 3, a polyurethane foam layer 4, and a core material layer 5 are laminated in this order.

The skin layer 2 constitutes the surface of the resin molded product 1 for vehicle members, and from the viewpoint of having excellent chemical resistance and durability and having a good texture, vinyl chloride resin and a plasticizer are used. It is preferable to configure the vinyl chloride resin composition containing, more preferably powder slush molding the vinyl chloride resin composition.

From the viewpoint of facilitating powder slush molding of the vinyl chloride resin composition, it is preferable to use a vinyl chloride resin (A) having an average particle size of 50 μm or more and 500 μm or less as the vinyl chloride resin. The average particle size of the vinyl chloride resin (A) is more preferably 100 µm or more, further preferably 150 µm or more. Moreover, the average particle size of the vinyl chloride resin (A) is more preferably 300 μm or less, and even more preferably 200 μm or less. More specifically, the average particle size of the vinyl chloride resin (A) is, for example, preferably 100 μm or more and 300 μm or less, more preferably 100 μm or more and 200 μm or less, and 150 μm or more and 200 μm or less. More preferred. When the average particle size of the vinyl chloride resin (A) is within the range described above, the powder fluidity of the vinyl chloride resin composition is enhanced, and the skin layer 2 molded from the vinyl chloride resin composition and the polyurethane foam are formed. Adhesion to layer 3 is improved. In the present invention, the average particle size of the vinyl chloride resin (A) is measured according to JIS K 7369:2009.

From the viewpoint of facilitating pulverization of the vinyl chloride resin composition, the vinyl chloride resin (A) preferably has an average degree of polymerization of 1350 or more, more preferably 1400 or more. In addition, the upper limit of the average polymerization degree of the vinyl chloride resin (A) is not particularly limited, and may be, for example, 3800 or less, from the viewpoint of increasing the flexibility at low temperatures of the skin layer 2 molded from the vinyl chloride resin composition. Therefore, the average degree of polymerization is preferably 3500 or less, more preferably 3000 or less. More specifically, the average degree of polymerization of the vinyl chloride resin (A) is preferably 1700 or more and 3800 or less, more preferably 1700 or more and 3500 or less, and even more preferably 2000 or more and 3000 or less. In the present invention, the average degree of polymerization of the vinyl chloride resin (A) is measured according to JIS K 6720-2:1999.

The vinyl chloride resin (A) is not particularly limited, but for example, a homopolymer of a vinyl chloride monomer or a copolymer of a vinyl chloride monomer and another copolymerizable monomer may be used. can. Examples of other copolymerizable monomers include, but are not particularly limited to, ethylene, propylene, vinyl acetate, allyl chloride, allyl glycidyl ether, acrylic acid ester, vinyl ether, and the like. The vinyl chloride resin (A) may be used alone or in combination of two or more.

The vinyl chloride resin (A) may be produced by any known polymerization method such as a suspension polymerization method or a bulk polymerization method. It is preferable to manufacture in

The vinyl chloride resin composition is not particularly limited, but may contain, for example, 25% by mass or more, or 30% by mass or more of the vinyl chloride resin (A). Further, the vinyl chloride resin composition may contain, for example, the vinyl chloride resin (A) in an amount of 60% by mass or less, 55% by mass or less, 50% by mass or less, or 45% by mass or less. good. More specifically, the vinyl chloride resin composition may contain, for example, 30% by mass or more and 60% by mass or less, or 35% by mass or more and 55% by mass or less of the vinyl chloride resin (A).

From the viewpoint of enhancing the flexibility and heat aging resistance of the skin layer 2, the vinyl chloride resin composition preferably contains 110 parts by mass or more of a plasticizer with respect to 100 parts by mass of the vinyl chloride resin (A). More preferably 115 parts by mass or more, more preferably 120 parts by mass or more. In addition, from the viewpoint of facilitating pulverization of the vinyl chloride resin composition, the vinyl chloride resin composition should contain 180 parts by mass or less of a plasticizer with respect to 100 parts by mass of the vinyl chloride resin (A). , more preferably 170 parts by mass or less, and even more preferably 160 parts by mass or less. More specifically, the vinyl chloride resin composition preferably contains 110 parts by mass or more and 180 parts by mass or less of a plasticizer with respect to 100 parts by mass of the vinyl chloride resin (A). It is more preferable to contain 120 parts by mass or more and 160 parts by mass or less.

The plasticizer is not particularly limited as long as it is used as a plasticizer for vinyl chloride resins. For example, trimellitic acid-based plasticizers, phthalic acid-based plasticizers, pyromellitic acid-based plasticizers, epoxy-based plasticizers, polyester-based plasticizers, and the like can be used. It is preferable to use a trimellitic acid-based plasticizer from the viewpoint of less migration and bleed-out of the plasticizer and higher heat aging resistance. From the viewpoint of increasing flexibility at low temperatures, a polyester plasticizer or the like may be used. From the viewpoint of versatility, a phthalate plasticizer may be used.

The trimellitic acid-based plasticizer is not particularly limited, but examples include tri(2-ethylhexyl) trimellitate, tri(n-octyl) trimellitate, triisooctyl trimellitate, triisodecyl trimellitate, tri triisononyl mellitic acid, di(n-octyl) mono(n-decyl) trimellitic acid, diisooctyl monoisodecyl trimellitic acid and the like.

The phthalate-based plasticizer is not particularly limited, but examples include di(n-butyl) phthalate, di(n-octyl) phthalate, di(2-ethylhexyl) phthalate, diisooctyl phthalate, and octyl phthalate. decyl, diisodecyl phthalate, butyl benzyl phthalate, di(2-ethylhexyl) isophthalate and the like.

Examples of the pyromellitic acid-based plasticizer include, but are not particularly limited to, tetra(2-ethylhexyl) pyromellitic acid, tetra(n-octyl) pyromellitic acid, and the like. Examples of the epoxy plasticizer include, but are not limited to, epoxidized soybean oil, epoxidized linseed oil, and epoxidized tall oil fatty acid (2-ethylhexyl).

The polyester plasticizer is not particularly limited. polyester-based plasticizers and the like. Examples of polyvalent carboxylic acids include aliphatic dicarboxylic acids having 2 to 10 carbon atoms such as adipic acid, azelaic acid and sebacic acid, and dicarboxylic acids such as aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and terephthalic acid. mentioned. Examples of polyhydric alcohols include glycols having 2 to 10 carbon atoms such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol and hexanediol. As the dicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid and sebacic acid are preferable, and adipic acid is particularly preferable in terms of versatility, price, and stability over time. Either linear or branched glycol can be used as the glycol, and is appropriately selected according to need. The glycol preferably has 2 to 6 carbon atoms.

Examples of adipic acid polyester plasticizers include reaction products of adipic acid and one or more dihydric alcohols. Examples of dihydric alcohols include ethylene glycol, propylene glycol, butanediol, 1 , 6-hexanediol and the like. Specifically, poly(propylene glycol, adipic acid) ester, poly(butanediol, adipic acid) ester, poly(ethylene glycol, adipic acid) ester, poly(1,6-hexanediol, butanediol, adipic acid) esters, poly(butanediol, ethylene glycol, adipic acid) esters, poly(ethylene glycol, propylene glycol, butanediol, adipic acid) esters, and the like.

The above plasticizers may be used singly or in combination of two or more.

From the viewpoint of reducing the coefficient of dynamic friction of the skin layer 2 to enhance the surface properties and suppressing changes in flexibility due to heat aging, the vinyl chloride resin composition preferably contains an acrylic polymer. The acrylic polymer contains 40% by mass or more and 95% by mass or less of structural units derived from methyl (meth)acrylate, and (meth)acrylic acid esters of aliphatic alcohols having 2 or more carbon atoms and aromatic alcohols ( It is preferable that at least one (meth)acrylic acid ester-derived structural unit selected from the group consisting of meth)acrylic acid esters is contained in an amount of 5% by mass or more and 60% by mass or less. By using such an acrylic polymer, the surface properties of the skin layer 2 formed by molding the vinyl chloride resin composition can be improved, and the flexibility after heat aging can be enhanced. In addition, the compatibility between the acrylic polymer and the plasticizer is enhanced, and migration of the plasticizer to the polyurethane foam layer 3 can be suppressed. In (meth)acrylic acid esters of fatty alcohols, the fatty alcohols may be linear, branched or cyclic. In the present invention, "(meth)acrylic acid" means acrylic acid and/or methacrylic acid. Moreover, "(meth)acrylic acid ester" means acrylic acid ester and/or methacrylic acid ester.

The (meth)acrylic acid ester of an aliphatic alcohol having 2 or more carbon atoms, that is, the (meth)acrylic acid ester having an alkyl group having 2 or more carbon atoms is not particularly limited, but for example, (meth)acrylic acid Ethyl, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-(meth)acrylate Pentyl, n-hexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, (meth)acrylic acid decyl, dodecyl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, glycidyl (meth)acrylate and the like. Examples of the (meth)acrylic acid ester of the aromatic alcohol include, but are not particularly limited to, phenyl (meth)acrylate and benzyl (meth)acrylate. These may be used individually by 1 type, and may be used in combination of 2 or more types. Although the acrylic polymer is not particularly limited, it preferably contains a (meth)acrylic acid ester of an aliphatic alcohol having 2 or more carbon atoms from the viewpoint of easily obtaining a molded article having good surface properties.

The (meth)acrylic acid ester of an aliphatic alcohol having 2 or more carbon atoms is not particularly limited, but for example, from the viewpoint of improving the surface properties of the skin layer 2, the number of carbon atoms is 2 or more and 24 or less. From the viewpoint of facilitating emulsion polymerization or microsuspension polymerization, it is more preferably 2 or more and 12 or less, and further preferably 2 or more and 8 or less. Further, from the viewpoint of further improving the surface properties of the skin layer 2, the (meth)acrylic acid ester of the aliphatic alcohol having 2 or more carbon atoms includes n-butyl (meth)acrylate, isobutyl (meth)acrylate and It is preferably a (meth)acrylic acid ester of at least one aliphatic alcohol having 4 carbon atoms selected from the group consisting of tert-butyl (meth)acrylate, n-butyl (meth)acrylate and (meth) More preferably, it is at least one (meth)acrylic acid ester of an aliphatic alcohol having 4 carbon atoms selected from the group consisting of isobutyl acrylate. Moreover, from the viewpoint of further improving the surface properties of the skin layer 2, the (meth)acrylic acid ester of the aliphatic alcohol having 2 or more carbon atoms may contain cyclohexyl (meth)acrylate.

For example, from the viewpoint of improving the surface properties of the skin layer 2 and increasing the flexibility after heat aging, the acrylic polymer contains 40% by mass or more and 95% by mass or less of structural units derived from methyl (meth)acrylate. and at least one (meth)acrylic acid ester-derived structural unit selected from the group consisting of n-butyl (meth)acrylate, isobutyl (meth)acrylate and tert-butyl (meth)acrylate in an amount of 5% by mass or more. It preferably contains 60% by mass or less, and 50% by mass or more and 95% by mass or less of structural units derived from methyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate and (meth)acrylic More preferably, at least one (meth)acrylic acid ester-derived structural unit selected from the group consisting of tert-butyl acid is contained in 5% by mass or more and 50% by mass or less, and 60 methyl (meth)acrylate-derived structural units. % by mass or more and 95% by mass or less, and at least one selected from the group consisting of n-butyl (meth)acrylate, isobutyl (meth)acrylate and tert-butyl (meth)acrylate (meth)acrylic acid ester-derived More preferably, it contains 5% by mass or more and 40% by mass or less of the structural unit.

The acrylic polymer may contain structural units derived from other monomers in addition to the structural units derived from methyl (meth)acrylate and the structural units derived from the (meth)acrylic acid ester described above. Other monomers include, for example, carboxyl group-containing monomers, sulfonic acid group-containing monomers, carbonyl group-containing (meth)acrylates, hydroxyl group-containing (meth)acrylates, epoxy group-containing (meth)acrylates, and amino group-containing (Meth)acrylates and the like. Carboxyl group-containing monomers include, for example, methacrylic acid, acrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, 2-succinoyloxyethyl methacrylate, 2-maleinoyloxyethyl methacrylate, 2- phthaloyloxyethyl, 2-hexahydrophthaloyloxyethyl methacrylate, and the like. Examples of sulfonic acid group-containing monomers include allylsulfonic acid. Examples of carbonyl group-containing (meth)acrylates include acetoacetoxyethyl (meth)acrylate. Examples of hydroxyl group-containing (meth)acrylates include 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate. Examples of epoxy group-containing (meth)acrylates include glycidyl (meth)acrylate. Examples of the amino group-containing (meth)acrylates include N-dimethylaminoethyl (meth)acrylate and N-diethylaminoethyl (meth)acrylate. Among them, methacrylic acid and acrylic acid are preferably used from the viewpoint of low cost and excellent polymerizability with (meth)acrylic acid esters. In the acrylic polymer, the content of structural units derived from other monomer components is preferably 5% by mass or less.

The acrylic polymer is not particularly limited, but preferably has an average particle size of 0.01 μm or more and 10 μm or less. The acrylic polymer preferably has an average particle size of, for example, 0.1 μm or more, more preferably 0.5 μm or more. Further, the average particle size of the acrylic polymer is, for example, preferably 5 μm or less, more preferably 2 μm or less. More specifically, the average particle size of the acrylic polymer is, for example, preferably 0.1 μm or more and 5 μm or less, and more preferably 0.5 μm or more and 2 μm or less. When the average particle size of the acrylic polymer is within the range described above, the powder flowability of the vinyl chloride resin composition is enhanced. In the present invention, the average particle size of the acrylic polymer is measured with a dynamic light scattering particle size distribution analyzer.

Although the acrylic polymer is not particularly limited, for example, it may have a mass average molecular weight of 50,000 or more and 2,500,000 or less, and from the viewpoint of increasing the flexibility after heat aging, the mass average molecular weight is 150,000 or more. , preferably 300,000 or more, and even more preferably 350,000 or more. In addition, from the viewpoint of enhancing the flexibility after heat aging, the weight average molecular weight is preferably 1,350,000 or less, more preferably 1,300,000 or less, and even more preferably 1,200,000 or less. More specifically, the acrylic polymer preferably has a mass average molecular weight of 150,000 or more and 1,350,000 or less, more preferably 300,000 or more and 1,300,000 or less, and 350,000 or more and 1,200,000 or less. is more preferred. In the present invention, the mass average molecular weight of the acrylic polymer is measured by GPC (gel permeation chromatography).

From the viewpoint of enhancing the flexibility of the skin layer 2 and the flexibility after heat aging, the amount of the acrylic polymer compounded is 4 parts by mass or more and 23 parts by mass or less with respect to 100 parts by mass of the vinyl chloride resin (A). more preferably 5 parts by mass or more and 22 parts by mass or less, and even more preferably 7 parts by mass or more and 20 parts by mass or less.

The acrylic polymer may be produced by any known polymerization method such as emulsion polymerization, seed emulsion polymerization, fine suspension polymerization, and seed fine suspension polymerization. It is preferable to use an emulsion polymerization method or a microsuspension polymerization method from the viewpoint of easy control of the particle size and suitability for industrial production. In the case of the polymerization method, a polymerization initiator, a surfactant (which functions as an emulsifier and/or a dispersant), a chain transfer agent, etc. can be used as appropriate.

Although the polymerization initiator is not particularly limited, for example, sodium persulfate, potassium persulfate, ammonium persulfate and the like can be used.

Examples of the surfactant include, but are not limited to, anionic surfactants such as fatty acid salts, alkylsulfosuccinates, alkylsarcosinates, alkylsulfates and alkylbenzenesulfonates; Nonionic surfactants such as polyoxyethylene fatty acid esters and glycerin fatty acid esters, and cationic surfactants such as alkylamine salts can be used as appropriate.

Although the chain transfer agent is not particularly limited, for example, alkylmercaptans and mercaptoalcohols having 2 to 12 carbon atoms in the main chain can be preferably exemplified. Examples of alkylmercaptans having 2 to 12 carbon atoms in the main chain include n-octylmercaptan (also called 1-octanethiol), t-octylmercaptan, n-dodecylmercaptan, t-dodecylmercaptan, and 2-ethylhexylthio. Glycol and the like are exemplified, and mercaptoalcohols include 2-mercaptoethanol and the like.

The acrylic polymer may be particles of uniform structure or core-shell particles having a core-shell structure. When the acrylic polymer is a core-shell particle, it is not particularly limited, but for example, the mass ratio of the core portion to the shell portion may be in the range of 10:90 to 90:10.

When the acrylic polymer is uniformly structured particles, the acrylic polymer can be produced by spray-drying a polymer latex obtained by polymerizing a monomer mixture (also referred to as one-step polymerization). When the acrylic polymer is a core-shell particle, the monomer mixture is further added to the latex of the polymer (core portion) obtained by polymerizing the monomer mixture, and polymerization is continued to produce a polymer (having a core-shell structure). After the latex is obtained, it is spray-dried to produce an acrylic polymer (also referred to as two-stage polymerization). Note that the core portion and/or the shell portion may be polymerized in two or more stages.

From the viewpoint of increasing the flexibility of the skin layer 2, the vinyl chloride resin composition may further contain a vinyl chloride resin (B) having an average particle size of 0.01 μm or more and less than 50 μm. The average particle size of the vinyl chloride resin (B) is not particularly limited, but for example, it is preferably 0.1 μm or more, more preferably 0.5 μm or more. Also, the average particle size of the vinyl chloride resin (B) is, for example, preferably 20 μm or less, more preferably 10 μm or less. More specifically, the average particle size of the vinyl chloride resin (B) is, for example, preferably 0.1 μm or more and 20 μm or less, and more preferably 0.5 μm or more and 10 μm or less. When the average particle size of the vinyl chloride resin (B) is within the range described above, the powder fluidity of the vinyl chloride resin composition is enhanced. In the present invention, the average particle size of the vinyl chloride resin (B) is measured by a laser diffraction/scattering particle size distribution analyzer, for example, a particle size distribution analyzer (MICROTRAC/HRA (9320-X100) manufactured by Nikkiso Co., Ltd.). to measure.

The average degree of polymerization of the vinyl chloride resin (B) is not particularly limited, and may be, for example, 500 or more, or 800 or more. The upper limit of the average degree of polymerization of the vinyl chloride resin (B) is not particularly limited, but may be, for example, 2000 or less, or 1500 or less. More specifically, the average degree of polymerization of the vinyl chloride resin (B) may be, for example, 500 or more and 2000 or less, or 800 or more and 1500 or less. When the average degree of polymerization of the vinyl chloride resin (B) is within the range described above, the powder fluidity of the vinyl chloride resin composition is enhanced and the moldability of the skin layer 2 is improved. In this specification, the average degree of polymerization of the vinyl chloride resin (B) is measured according to JIS K 6720-2:1999.

The vinyl chloride resin (B) is not particularly limited, but for example, a homopolymer of a vinyl chloride monomer and/or a copolymer of a vinyl chloride monomer and another copolymerizable monomer can be used. Examples of other copolymerizable monomers include, but are not particularly limited to, ethylene, propylene, vinyl acetate, allyl chloride, allyl glycidyl ether, acrylic acid ester, vinyl ether, and the like.

The vinyl chloride resin (B) may be produced by any known polymerization method such as an emulsion polymerization method, a seed emulsion polymerization method, a fine suspension polymerization method, and a seed fine suspension polymerization method. From the viewpoint of ease of obtaining, it is preferable to manufacture by a fine suspension polymerization method.

In the vinyl chloride resin composition, the amount of the vinyl chloride resin (B) is preferably 36 parts by mass or less per 100 parts by mass of the vinyl chloride resin (A), from the viewpoint of lowering the dynamic friction coefficient. Therefore, it is more preferably 30 parts by mass or less, further preferably 20 parts by mass or less. Moreover, the lower limit of the amount of the vinyl chloride resin (B) to be blended may be 3 parts by mass or more, or may be 5 parts by mass or more, from the viewpoint of improving the meltability. Further, when the blending amount of the vinyl chloride resin (B) relative to the vinyl chloride resin (A) is within the range described above, the powder fluidity of the vinyl chloride resin composition is enhanced.

In the vinyl chloride resin composition, from the viewpoint of reducing the dynamic friction coefficient of the skin layer 2 and increasing the flexibility after heat aging, an acrylic polymer and chloride are added to 100 parts by mass of the vinyl chloride resin (A). The total blending amount of the vinyl resin (B) is preferably 15 parts by mass or more and 40 parts by mass or less, more preferably 15 parts by mass or more and 35 parts by mass or less, and 15 parts by mass or more and 30 parts by mass or less. It is even more preferable to have

From the viewpoint of further reducing the dynamic friction coefficient of the skin layer 2 and improving the surface properties, the vinyl chloride resin composition may contain acrylic-modified polyorganosiloxane, for example, vinyl chloride resin (A) 100 parts by mass. On the other hand, the amount of the acrylic-modified polyorganosiloxane compounded may be 0.5 parts by mass or more, or may be 1 part by mass or more. From the viewpoint of increasing the flexibility of the skin layer 2 after heat aging, the amount of the acrylic-modified polyorganosiloxane compounded is preferably 5 parts by mass or less, and 4 parts by mass with respect to 100 parts by mass of the vinyl chloride resin (A). Part or less is more preferable. More specifically, with respect to 100 parts by mass of the vinyl chloride resin (A), the amount of the acrylic-modified polyorganosiloxane compounded may be 0.5 parts by mass or more and 5 parts by mass or less, or 1 part by mass or more and 5 parts by mass. part or less, or 1 part by mass or more and 4 parts by mass or less.

The acrylic-modified polyorganosiloxane preferably has a silicone (polyorganosiloxane) content of 60% by mass or more. The acrylic-modified polyorganosiloxane also functions as a lubricant.

As the acrylic-modified polyorganosiloxane, for example, acrylic-modified polyorganosiloxane obtained by emulsion graft copolymerization of polyorganosiloxane and (meth)acrylic acid ester may be used. As the acrylic-modified polyorganosiloxane, for example, a commercially available product such as a silicone-acrylic hybrid resin (Charine (registered trademark)) manufactured by Nissin Chemical Industry Co., Ltd. can be used.

The skin layer 2, that is, the vinyl chloride-based resin composition may further contain resin compounding agents such as a stabilizer, a coloring agent, an antioxidant, a filler, and an ultraviolet absorber as appropriate. In addition, a lubricant other than acrylic-modified polyorganosiloxane may be included as appropriate.

Examples of the stabilizer include epoxy-based stabilizers, barium-based stabilizers, calcium-based stabilizers, tin-based stabilizers, zinc-based stabilizers, hindered amine-based light stabilizers, calcium-zinc-based (Ca-Zn-based) and A composite stabilizer such as a barium-zinc system (Ba--Zn system) can also be used. One of the stabilizers may be used alone, or two or more of them may be used in combination. The stabilizer is preferably blended in an amount of 0.01 parts by mass or more and 8 parts by mass or less per 100 parts by mass of the vinyl chloride resin (A).

Examples of the coloring agent include titanium oxide, zinc oxide, and carbon black. Moreover, as the coloring agent, commercially available pigments such as blue pigments and red pigments may be used. One of the colorants may be used alone, or two or more of them may be used in combination.

The vinyl chloride-based resin composition includes a vinyl chloride-based resin (A), a plasticizer, and optionally an acrylic polymer, a vinyl chloride-based resin (B), an acrylic-modified polyorganosiloxane, and other resin compounding agents. can be produced by appropriately mixing the Although the mixing method is not particularly limited, for example, a dry blending method is preferred. Although the mixer is not particularly limited, for example, a super mixer or the like can be used.

The skin layer 2 can be obtained by subjecting the vinyl chloride resin composition to powder slush molding. Therefore, the skin layer 2 has the same composition as the vinyl chloride resin composition. The method of powder slush molding is not particularly limited. While the resin composition is charged, the mold is heated to a predetermined temperature (for example, 230 ° C. or higher and 280 ° C. or lower), then the slush molding machine is reversed, and the surface of the mold heated to the predetermined temperature The vinyl chloride resin composition is kept in contact for a predetermined time (for example, 3 seconds or more and 15 seconds or less), and then the slush molding machine is turned over again to cool the mold (for example, 10°C or more and 60°C or less). Then, a method of peeling the compact from the cooled mold can be used.

The shape of the skin layer 2 may be appropriately determined according to the application, purpose, etc. of the resin molded product 1 for vehicle members, and is not particularly limited. The thickness of the skin layer 2 is not particularly limited. It may be below.

The adhesion barrier layer 3 is arranged between the skin layer 2 and the polyurethane foam layer 4, and is composed of an acrylic resin containing hydroxyl groups, which will be described later, so that the skin layer 2 and the polyurethane foam layer 4 adhere to each other. Also, the plasticizer plays a role of suppressing the movement of the skin layer 2 to the polyurethane foam layer 4 due to heat or the like.

The hydroxyl-containing acrylic resin contains 20% by mass or more and 60% by mass or less of structural units derived from (meth)acrylate having a hydroxyl group, and 40% by mass or more and 80% by mass or less of methyl (meth)acrylate-derived structural units. . Preferably, it contains 20% by mass or more and 50% by mass or less of structural units derived from (meth)acrylate having a hydroxyl group, and 50% by mass or more and 80% by mass or less of structural units derived from methyl (meth)acrylate. Here, (meth)acrylate means methacrylate and/or acrylate.

As the (meth)acrylate having a hydroxyl group, a hydroxyalkyl (meth)acrylate is preferable from the viewpoint of adhesiveness. In the hydroxyalkyl (meth)acrylate, the alkyl group includes a linear or branched C 1-10 alkyl group.

Specific examples of the hydroxyalkyl (meth)acrylates include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 3-methyl-3-hydroxybutyl (meth)acrylate, 1,3-dimethyl-3-hydroxybutyl (meth)acrylate, 2,2,4-trimethyl-3-hydroxypentyl (meth)acrylate, 2-ethyl-3 - hydroxyhexyl (meth)acrylate, polypropylene glycol mono (meth) acrylate, polyethylene glycol mono (meth) acrylate, poly (ethylene glycol-propylene glycol) mono (meth) acrylate, and the like. Among them, from the viewpoint of further enhancing the adhesion between the skin layer 2 and the polyurethane foam layer 3 and the heat aging resistance of the skin layer 2, the hydroxyalkyl (meth)acrylates are 2-hydroxyethyl (meth)acrylate, 2- It is preferably one or more selected from the group consisting of hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl acrylate.

The methyl (meth)acrylate may be methyl methacrylate, methyl acrylate, or a mixture thereof. From the viewpoint of versatility, the methyl (meth)acrylate is preferably methyl methacrylate.

The hydroxyl group-containing acrylic resin may contain structural units derived from other monomers in addition to structural units derived from (meth)acrylate having a hydroxyl group and structural units derived from methyl (meth)acrylate. Other monomers include, for example, (meth)acrylic acid esters of aliphatic alcohols having 2 or more carbon atoms, carboxyl group-containing monomers, sulfonic acid group-containing monomers, carbonyl group-containing (meth)acrylates, and epoxy group-containing (Meth)acrylates, amino group-containing (meth)acrylates, and the like. 1 type of these other monomers may be included, and 2 types may be included. In the hydroxyl group-containing acrylic resin, the content of structural units derived from other monomer components is preferably 20% by mass or less, more preferably 10% by mass or less, from the viewpoint of adhesiveness and plasticizer migration suppression. , more preferably 5% by mass or less.

Although the hydroxyl group-containing acrylic resin is not particularly limited, for example, from the viewpoint of obtaining good adhesiveness and barrier properties, the number average molecular weight is preferably 4000 or more, more preferably 6000 or more, and still more preferably. is 8000 or more. The hydroxyl group-containing acrylic resin is not particularly limited, but for example, from the viewpoint of productivity, the number average molecular weight is preferably 600,000 or less, more preferably 500,000 or less, and 400,000 or less. It is even more preferable to have In the present invention, the number average molecular weight of the hydroxyl group-containing acrylic resin is measured by GPC (gel permeation chromatography).

Although the hydroxyl group-containing acrylic resin is not particularly limited, for example, from the viewpoint of obtaining good adhesion, the hydroxyl value is preferably 40 mgKOH/g or more and 300 mgKOH/g or less, and 60 mgKOH/g or more and 280 mgKOH/g or less. more preferably 75 mgKOH/g or more and 260 mgKOH/g or less.

The hydroxyl group-containing acrylic resin may be polymerized by a conventionally known polymerization method such as solution polymerization, bulk polymerization, suspension polymerization, emulsion polymerization, and the like, and is not particularly limited. From the viewpoint of easy formation, solution polymerization is preferred. Solution polymerization can be carried out under conventionally known conditions in a solvent in the presence of a polymerization initiator.

The polymerization initiator is not particularly limited, and for example, a radical polymerization initiator can be used. As a radical polymerization initiator, for example, any one or more of an azo compound and an organic peroxide can be used. Examples of azo compounds include azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexanecarbonitrile) and the like. Examples of organic peroxides include hydrogen peroxide, ditertiarybutyl peroxide, and benzoyl peroxide.

The solvent is not particularly limited as long as it can dissolve the monomer components used in the polymerization. For example, aromatic solvents such as toluene and xylene; alcohol solvents such as n-butyl alcohol, propylene glycol monomethyl ether, diacetone alcohol and ethyl cellosolve; ester solvents such as ethyl acetate, butyl acetate and cellosolve acetate; ketone-based solvents such as methyl isobutyl ketone and cyclohexanone; and dimethylformamide.

In the case of solution polymerization, all of the monomers may be charged at once, or a part thereof may be charged into a reaction vessel and the rest may be added dropwise.

The solution of the hydroxyl-containing acrylic resin obtained by solution polymerization preferably has a concentration of the hydroxyl-containing acrylic resin of 70% by mass or less, more preferably 60% by mass or less, from the viewpoint of ease of handling. Preferably, it is 50% by mass or less. From the viewpoint of productivity, the hydroxyl-containing acrylic resin solution obtained by solution polymerization preferably has a hydroxyl-containing acrylic resin concentration of 5% by mass or more, more preferably 10% by mass or more. Preferably, it is 15% by mass or more.

The solution of the hydroxyl group-containing acrylic resin obtained by solution polymerization may be used as it is, or it may be dried and powdered. preferable. When the hydroxyl group-containing acrylic resin is in the form of a solution, the adhesive barrier layer 3 can be formed by directly applying it to the back surface of the skin layer and drying it. The drying temperature is not particularly limited as long as it can remove the solvent in the solution of the hydroxyl group-containing acrylic resin. When the hydroxyl group-containing acrylic resin is in powder form, it may be adhered to the back surface of the skin layer by powder slush molding.

Although the adhesion barrier layer 3 is not particularly limited, for example, from the viewpoint of more effectively suppressing the movement of the plasticizer from the skin layer to the polyurethane foam layer, the thickness is preferably 5 μm or more, and 10 μm or more. It is more preferable that the thickness is 15 μm or more. Although the adhesive barrier layer 3 is not particularly limited, for example, from the viewpoint of productivity, the thickness is preferably 80 μm or less, more preferably 60 μm or less, and even more preferably 40 μm or less.

The polyurethane foam layer 4 imparts cushioning properties to the resin molded product 1 for vehicle members. A laminate of a skin layer 2 and an adhesive barrier layer 3 A polyurethane foam layer 4 is laminated on the adhesive barrier layer 3 . The lamination method is not particularly limited. For example, a laminate of the skin layer 2 and the adhesive barrier layer 3 is produced as described above, and a polyurethane foam molded body to be the polyurethane foam layer 4 is separately produced, followed by heat melting. A method of bonding by adhesion or thermal adhesion: On the laminate of the skin layer 2 and the adhesion barrier layer 3, isocyanates and polyols, which are raw materials for foamed polyurethane moldings, are reacted to polymerize and polymerize. Examples include a method of laminating by foaming polyurethane by a method. The latter has a simpler process, and even when obtaining laminates of various shapes, the laminate of the skin layer 2 and the adhesion barrier layer 3 can be reliably adhered to the foamed polyurethane molded article. This is preferable because it can be done.

The thickness of the polyurethane foam layer 4 is not particularly limited, and may be determined appropriately according to the application, purpose, etc. of the resin molded product 1 for vehicle members. It may be greater than or equal to 20 mm or less.

The core layer 5 can be made of a thermoplastic resin. The core material layer 5 can be made of, for example, a polyolefin resin, an ABS (acrylonitrile-butadiene-styrene) resin, or the like, from the viewpoint of versatility. The polyolefin-based resin is not particularly limited, but includes, for example, a polypropylene-based resin. The polypropylene-based resin may be a propylene homopolymer, or a copolymer of propylene and other α-olefin such as ethylene and butylene. It may be a polymer.

The core material layer 5 can be molded by injection molding or the like. By carrying out foam molding of polyurethane between the laminate of the skin layer 2 and the adhesive barrier layer 3 and the core material layer 5, a resin molded product for a vehicle member can be produced.

The thickness of the core material layer 5 is not particularly limited, and may be appropriately determined according to the application, purpose, etc. of the resin molded product 1 for vehicle members. 1.5 mm or more and 3.0 mm or less.

The resin molded product 1 for vehicle members is not particularly limited, but for example, instrument panels of vehicles such as automobiles, door trims, trunk trims, seat seats, pillar covers, ceiling materials, rear trays, console boxes, airbag covers, armrests, It can be suitably used for vehicle interior materials such as headrests, meter covers, and crash pads.

EXAMPLES The present invention will be described in more detail below using examples. In addition, the present invention is not limited to the following examples.

First, the measurement/evaluation methods used in Examples and Comparative Examples will be described.
(1) Average Particle Size The average particle size of the acrylic polymer was measured using a dynamic light scattering particle size distribution analyzer ("Nanotrac Wave-EX150" manufactured by Microtrac Bell).
(2) Mass average molecular weight The mass average molecular weight (Mw) of the acrylic polymer was measured using a high-speed GPC device ("HLC-8220" manufactured by Tosoh Corporation, columns: "TSKguardcolumnHZ-H" and "TSKgelSuperHZM-H" manufactured by Tosoh Corporation. , GPC solvent: THF).
(3) Number average molecular weight The number average molecular weight (Mn) of the acrylic resin containing a hydroxyl group was measured using a high-speed GPC device ("HLC-8320" manufactured by Tosoh Corporation, column: 3 "TSKgelsuperMultiporeHZ-M" manufactured by Tosoh Corporation. , GPC solvent: THF).
(4) Adhesion The PVC sheet that serves as the skin layer was peeled off from the resin molded product for vehicle components. If the polyurethane foam layer was destroyed, the adhesion was judged to be good. and
(5) Heat Aging Resistance A laminate sample obtained by cutting a resin molded product for a vehicle member into a length of 19 cm and a width of 25 cm was placed in an oven and heated at 120° C. for 168 hours to heat-age the laminate sample. After that, the PVC sheet serving as the skin layer 2 was peeled off from the laminate sample, and the vertical and horizontal dimensions of the PVC sheet were measured. The vertical dimension of the PVC sheet in the laminate sample before heat aging is La, the horizontal dimension is Sa, the vertical dimension of the PVC sheet peeled from the laminate sample after heat aging is Lb, and the horizontal dimension is Sb. The shrinkage ratio of the skin layer after heat aging was calculated, and the heat aging resistance of the skin layer was evaluated. A shrinkage rate of 0.5% or less after heat aging was judged to be good in heat aging resistance.
Shrinkage after heat aging (%) = {1-(Lb/La+Sb/Sa)/2}×100 (1)

(Production Example 1 of acrylic polymer)
380 g of deionized water was put into a 2 L polymerization apparatus equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen gas inlet tube and a feed pump, and the temperature was raised while stirring under a nitrogen atmosphere until the internal temperature reached 80°C. At that point 23.5 g of 2% sodium persulfate was added. Next, 420.0 g of methyl methacrylate (MMA), 280.0 g of isobutyl methacrylate (iBMA), 2.5 g of sodium di-(2-ethylhexyl)sulfosuccinate, 0.05 g of 1-octanethiol, and 230 g of deionized water. A monomer emulsion prepared by mixing and stirring 0.0 g was added dropwise over 2 hours, and after the dropwise addition, stirring was continued for 2 hours at 80° C. to obtain a latex. The obtained latex is cooled to room temperature, and spray-dried using a spray dryer (L-12-LS model from Ohkawara Kakoki Co., Ltd.) at an inlet temperature of 130°C, an outlet temperature of 60°C, and an atomizer disk rotation speed of 20000 rpm. An acrylic polymer was produced. The obtained acrylic polymer had an average particle diameter of 0.80 μm and a mass average molecular weight (Mw) of 520,000.

(Production Examples 1 to 9 of Acrylic Resins Containing Hydroxyl Groups)
A reactor equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen gas inlet pipe and a dropping funnel was charged with the component (a) shown in Table 1 below, and the temperature was raised to 110°C while nitrogen gas was introduced. , a mixture of component (a) shown in Table 1 was dropped from the dropping funnel at a constant rate over 4 hours. Next, a mixed solution of component (c) shown in Table 1 below was added dropwise at a constant rate over 1 hour. Subsequently, the mixture was stirred at 110° C. for 2 hours and then cooled to room temperature to synthesize acrylic resin solutions Z1 to Z9 containing hydroxyl groups. The concentration of the acrylic resin in the obtained acrylic resin solutions Z1 to Z9 containing hydroxyl groups (hereinafter also simply referred to as acrylic resin solutions Z1 to Z9) and the number average molecular weight of the acrylic resin measured by GPC were measured. It is shown in Table 1 below.

(Example 1)
<Production of vinyl chloride resin composition>
Vinyl chloride resin (A) (vinyl chloride homopolymer, average polymerization degree 1700, average particle size 152 μm, Kaneka Corporation "KS-1700") 100 parts by mass in a 100 L super mixer (manufactured by Kawata Co., Ltd.), 120 parts by mass of plasticizer (tri(n-octyl) trimellitate, "C-8L" manufactured by ADEKA Co., Ltd.), 5 parts by mass of zinc stearate as stabilizer, 1.5 parts by mass of sodium perchlorate, hindered amine light 0.3 parts by mass of a stabilizer (HALS), 5 parts by mass of epoxidized soybean oil, and 3 parts by mass of a pigment (black) are added, mixed at 70°C, heated to dry the mixture, and then heated to 50°C. Cooled below. To the resulting mixture, 10 parts by mass of the acrylic polymer obtained in Production Example 1 and vinyl chloride resin (B) (vinyl chloride homopolymer, average degree of polymerization 1300, average particle size 10 μm, manufactured by Kaneka Corporation "PSM-31") was added and mixed to prepare a vinyl chloride resin composition (powder).

<Production of skin layer 2>
Using the vinyl chloride resin composition obtained above, a box equipped with a slush molding mold having a grained flat plate (length 22 cm × width 31 cm) and a powder box (length 22 cm × width 31 cm × depth 16 cm) Powder slush molding was performed using a mold slush molding machine. Specifically, first, 2 kg of a vinyl chloride resin composition was put into a powder box, and a slush molding die heated to 280° C. was set in a slush molding machine. Next, when the mold reaches 260 ° C., the slush molding machine is turned over, and the vinyl chloride for powder molding is molded so that the vinyl chloride resin sheet (also referred to as PVC sheet) has a thickness of 1.2 mm. After holding the system resin composition in the mold for about 10-12 seconds, the slush molding machine was inverted. After 60 seconds, the mold was cooled to 50°C with cooling water. Next, the PVC sheet was peeled off from the mold to obtain a vinyl chloride resin molding used as the skin layer 2 .

<Formation of adhesion barrier layer 3>
The acrylic resin solution Z1 obtained above was applied to the surface of the PVC sheet opposite to the textured surface using a glass rod so that the film thickness after drying was about 30 μm. ℃ for 10 minutes to produce a laminate of the skin layer 2 and the adhesive barrier layer 3.

<Formation of polyurethane foam layer 4>
The laminate of the skin layer 2 and the adhesive barrier layer 3 obtained above is placed on the bottom surface of a foam molding mold (length 190 mm x width 240 mm x depth 11 mm), and the skin layer 2 is in contact with the bottom surface of the foam molding mold. I laid it like this. Next, on the adhesive barrier layer 3 of the laminate, 36 g of liquid A containing 4,4′-diphenylmethane-diisocyanate and liquid B containing polyether polyol (1.0% by mass of triethylenediamine, 1.6% by mass of water) % content) was poured and the mold was sealed. After a predetermined period of time, a laminate comprising a skin layer 2 (about 1 mm thick), an adhesive barrier layer 3 (about 30 μm thick), and a polyurethane foam layer 4 (about 8 mm thick) laminated in this order was removed from the mold. Recovered.

(Examples 2-4)
A laminate was produced in the same manner as in Example 1, except that acrylic resin solutions Z2 to Z4 were used to form the adhesive barrier layers 3 instead of the acrylic resin solution Z1.

(Comparative example 1)
A laminate was produced in the same manner as in Example 1, except that a polyurethane foam layer was formed on the skin layer without forming an adhesive barrier layer.

(Comparative Examples 2 to 6)
A resin molded product for a vehicle member was produced in the same manner as in Example 1, except that acrylic resin solutions Z5 to Z9 were used to form the adhesive barrier layer 3 instead of the acrylic resin solution Z1.

In the resin molded articles for vehicle members of Examples and Comparative Examples, the adhesiveness between the skin layer and the polyurethane foam layer and the heat aging resistance of the skin layer were evaluated as described above. These results are shown in Tables 2 and 3 below.

As can be seen from the results in Table 2 above, in the resin molded products for vehicle members of Examples 1 to 4, 20% by mass of structural units derived from (meth)acrylate having a hydroxyl group were placed between the skin layer and the polyurethane foam layer. 60% by mass or less, and 40% by mass or more and 80% by mass or less of structural units derived from methyl (meth)acrylate, and an adhesive barrier layer composed of a hydroxyl group-containing acrylic resin is disposed, whereby the surface layer The adhesiveness of the polyurethane foam layer was good, and the shrinkage rate of the skin layer after heat aging was 0.5% or less, and the heat aging resistance was also good. Good heat aging resistance means that migration of the plasticizer from the skin layer to the polyurethane foam layer due to heat aging is effectively suppressed.

On the other hand, as can be seen from the results in Table 3, the content of structural units derived from (meth)acrylate having a hydroxyl group in Comparative Example 1, which does not have an adhesion barrier layer, and the hydroxyl-containing acrylic resin constituting the adhesion barrier layer is Comparative Examples 2 and 3 in which the content is less than 20% by mass, and Comparative Examples 4 to 6 in which the content of structural units derived from methyl (meth)acrylate in the hydroxyl-containing acrylic resin constituting the adhesive barrier layer is less than 40% by mass. In , the shrinkage ratio of the skin layer after heat aging was 1.3% or more, and the heat aging resistance was poor. Moreover, in Comparative Example 4, in which the content of structural units derived from methyl (meth)acrylate was 10% by mass or less, the adhesion between the skin layer and the polyurethane foam layer was also poor.

REFERENCE SIGNS LIST 1 Resin Molded Product for Vehicle Member 2 Skin Layer 3 Adhesion Barrier Layer 4 Polyurethane Foam Layer 5 Core Material Layer

Claims (7)

A resin molded product for a vehicle member having a skin layer, a core layer, and a polyurethane foam layer between these layers,
The skin layer contains a plasticizer,
An adhesive barrier layer made of an acrylic resin containing a hydroxyl group is disposed between the skin layer and the polyurethane foam layer,
The hydroxyl-containing acrylic resin contains 20% by mass or more and 60% by mass or less of structural units derived from (meth)acrylate having a hydroxyl group, and 40% by mass or more and 80% by mass or less of methyl (meth)acrylate-derived structural units. A resin molded product for a vehicle member, comprising: The (meth)acrylate having a hydroxyl group is selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl acrylate. 2. The resin molded product for vehicle components according to claim 1, comprising at least one hydroxyalkyl (meth)acrylate. The skin layer contains 110 parts by mass or more and 180 parts by mass or less of a plasticizer and 4 parts by mass or more of an acrylic polymer with respect to 100 parts by mass of a vinyl chloride resin (A) having an average particle diameter of 50 µm or more and 500 µm or less. 3. The resin molded product for a vehicle member according to claim 1 or 2, which contains parts by mass or less. The acrylic polymer contains 40% by mass or more and 95% by mass or less of structural units derived from methyl (meth)acrylate, and (meth)acrylic acid esters of aliphatic alcohols having 2 or more carbon atoms and aromatic alcohols ( 4. The resin molded article for a vehicle member according to claim 3, comprising 5% by mass or more and 60% by mass or less of structural units derived from at least one (meth)acrylic acid ester selected from the group consisting of meth)acrylic acid esters. 5. The resin molded product for a vehicle member according to claim 1, wherein the vinyl chloride resin (A) has an average degree of polymerization of 1350 or more. The resin molded product for vehicle members according to any one of claims 1 to 5, wherein the core material layer contains a polypropylene-based resin. The resin molded product for vehicle members according to any one of claims 1 to 6, which is a vehicle interior material.

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