Vinyl chloride resin composition, vinyl chloride resin molded article and laminate

Abstract

The purpose of the present invention is to provide a vinyl chloride resin composition capable of forming a vinyl chloride resin molded article having excellent adhesion to a foamed polyurethane molded article. A vinyl chloride resin composition according to the present invention is characterized by containing a vinyl chloride resin, a plasticizer, and a vinyl chloride-(meth)acrylate copolymer.

Description

[Technical Field]

[0001] The present invention relates to a vinyl chloride resin composition, a vinyl chloride resin molded article, and a laminate. [Background technology]

[0002] Vinyl chloride resins are generally used in a variety of applications due to their excellent properties such as cold resistance, heat resistance, and oil resistance. Specifically, for example, automobile interior parts such as automobile instrument panels and door trims are formed using automobile interior materials such as skins made of polyvinyl chloride resin molded products and laminates made by lining a skin made of polyvinyl chloride resin molded product with a foam such as polyurethane foam.

[0003] Vinyl chloride resin molded articles that form the skin of automobile interior parts such as automobile instrument panels are produced, for example, by powder molding a vinyl chloride resin composition containing vinyl chloride resin, a plasticizer, and additives such as pigments using a known molding method such as powder slush molding (see, for example, Patent Document 1).

[0004] Specifically, for example, in Patent Document 1, a skin made of a vinyl chloride resin molded article is produced by powder slush molding a vinyl chloride resin composition containing vinyl chloride resin particles, a trimellitic ester plasticizer, and additives such as a pigment made of a mixture of phthalocyanine blue, titanium oxide, and carbon. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-291243 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, when a laminate is formed by lining a foamed polyurethane molded body with a vinyl chloride resin molded body used as the surface of an automobile interior part, etc., it is required that the vinyl chloride resin molded body and the foamed polyurethane molded body adhere well and are not easily peeled off.

[0007] However, there is room for improvement in the adhesiveness of vinyl chloride resin molded articles obtained by molding the above-mentioned conventional vinyl chloride resin compositions to foamed polyurethane molded articles.

[0008] Therefore, an object of the present invention is to provide a vinyl chloride resin composition capable of forming vinyl chloride resin molded articles having excellent adhesion to foamed polyurethane molded articles. Another object of the present invention is to provide a vinyl chloride resin molded article that has excellent adhesion to a polyurethane foam molded article. A further object of the present invention is to provide a laminate in which a vinyl chloride resin molded article and a polyurethane foam molded article are well bonded to each other. [Means for solving the problem]

[0009] The present inventors have conducted extensive research to solve the above-mentioned problems, and have found that a vinyl chloride resin molded article having excellent adhesion to a polyurethane foam molded article can be obtained by molding a vinyl chloride resin composition containing a vinyl chloride resin, a plasticizer, and a predetermined copolymer, thereby completing the present invention.

[0010] The present invention aims to advantageously solve the above-mentioned problems, and provides a vinyl chloride resin composition comprising a vinyl chloride resin, a plasticizer, and a vinyl chloride-(meth)acrylate copolymer. Thus, by using a vinyl chloride resin composition comprising a vinyl chloride resin, a plasticizer, and a specified copolymer, a vinyl chloride resin molded article having excellent adhesion to a polyurethane foam molded article can be formed. In the present invention, (meth)acrylate means acrylate and / or methacrylate. Therefore, in the present invention, "vinyl chloride-(meth)acrylate copolymer" means vinyl chloride-acrylate copolymer and / or vinyl chloride-methacrylate copolymer.

[0011] Here, the vinyl chloride resin composition of the present invention preferably contains the vinyl chloride-(meth)acrylate copolymer in an amount of 0.5 to 10 parts by mass per 100 parts by mass of the vinyl chloride resin. If the content of the vinyl chloride-(meth)acrylate copolymer is within the above range, the adhesion of the resulting vinyl chloride resin molded article to a foamed polyurethane molded article can be further improved, and the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article can be improved.

[0012] Furthermore, in the vinyl chloride resin composition of the present invention, the proportion of structural units derived from (meth)acrylate in the vinyl chloride-(meth)acrylate copolymer is preferably 3% by mass or more and 50% by mass or less. If the proportion of structural units derived from (meth)acrylate in the vinyl chloride-(meth)acrylate copolymer is within the above-mentioned range, the adhesion of the resulting vinyl chloride resin molded article to a foamed polyurethane molded article can be further improved, and the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article can be improved.

[0013] In the vinyl chloride resin composition of the present invention, the plasticizer preferably contains a polyester. If the plasticizer contains a polyester, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be improved, and the heat shrinkage resistance of a laminate obtained by lining a polyurethane foam molded article with a vinyl chloride resin molded article can be improved.

[0014] Furthermore, in the vinyl chloride resin composition of the present invention, the polyester preferably contains structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol. If the polyester contains structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol, the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article formed can be further improved, and the heat shrinkage resistance of a laminate obtained by lining a foamed polyurethane molded article with a vinyl chloride resin molded article can be further improved.

[0015] The vinyl chloride resin composition of the present invention is preferably used for powder molding. By using the vinyl chloride resin composition for powder molding, a vinyl chloride resin molded article that can be favorably used as an automobile interior material, such as a skin for an automobile instrument panel, can be easily obtained.

[0016] The vinyl chloride resin composition of the present invention is preferably used for powder slush molding. By using the vinyl chloride resin composition for powder slush molding, it is possible to more easily obtain a vinyl chloride resin molded article that can be favorably used as an automobile interior material, such as a skin for an automobile instrument panel.

[0017] Furthermore, the present invention has an object to advantageously solve the above-mentioned problems, and provides a vinyl chloride resin molded article of the present invention, characterized in that it is obtained by molding any of the vinyl chloride resin compositions described above. In this way, a vinyl chloride resin molded article obtained by molding the vinyl chloride resin composition described above can exhibit excellent adhesion to foamed polyurethane molded articles.

[0018] The vinyl chloride resin molded article of the present invention is preferably used for the surface of an automobile instrument panel, and can be suitably used as the surface of an automobile instrument panel having excellent adhesion to a polyurethane foam molded article.

[0019] Furthermore, the vinyl chloride resin molded article of the present invention is preferably a sheet-shaped vinyl chloride resin molded article, and the vinyl chloride-(meth)acrylate copolymer particles are present on one surface of the sheet-shaped vinyl chloride resin molded article. If the vinyl chloride-(meth)acrylate copolymer particles are present on one surface of the sheet-shaped vinyl chloride resin molded article, the adhesion of the vinyl chloride resin molded article to a foamed polyurethane molded article can be further improved.

[0020] Furthermore, the present invention has an object to advantageously solve the above-mentioned problems, and provides a laminate comprising a polyurethane foam molded body and any of the vinyl chloride resin molded bodies described above. In the laminate comprising the polyurethane foam molded body and the vinyl chloride resin molded body described above, the vinyl chloride resin molded body and the polyurethane foam molded body are well bonded to each other.

[0021] The laminate of the present invention is preferably used for an automobile instrument panel. By using the laminate of the present invention in an automobile instrument panel, the surface layer and the polyurethane foam molded body of the manufactured automobile instrument panel can be well bonded. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a vinyl chloride resin composition capable of forming a vinyl chloride resin molded article having excellent adhesion to a polyurethane foam molded article. Furthermore, according to the present invention, it is possible to provide a vinyl chloride resin molded article that has excellent adhesion to a polyurethane foam molded article. Furthermore, according to the present invention, it is possible to provide a laminate in which a vinyl chloride resin molded article and a polyurethane foam molded article are well bonded to each other. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described in detail. The vinyl chloride resin composition of the present invention can be used, for example, to form the vinyl chloride resin molded article of the present invention. The vinyl chloride resin molded article formed using the vinyl chloride resin composition of the present invention can be suitably used, for example, as an automobile interior material, such as the surface of automobile interior parts such as automobile instrument panels and door trims. The vinyl chloride resin molded article of the present invention can be used, for example, to form the laminate of the present invention. The laminate formed using the vinyl chloride resin molded article of the present invention can be suitably used, for example, as an automobile interior material used in producing automobile interior parts such as automobile instrument panels and door trims.

[0024] (Vinyl chloride resin composition) The vinyl chloride resin composition of the present invention is characterized by containing (a) a vinyl chloride resin, (b) a plasticizer, and (c) a vinyl chloride-(meth)acrylate copolymer. The vinyl chloride resin composition of the present invention may optionally further contain additives other than the above (a) vinyl chloride resin, (b) plasticizer, and (c) vinyl chloride-(meth)acrylate copolymer. The vinyl chloride resin composition of the present invention contains at least the above-mentioned (a) vinyl chloride resin, (b) plasticizer, and (c) vinyl chloride-(meth)acrylate copolymer, and therefore can form vinyl chloride resin molded articles that have excellent adhesion to foamed polyurethane molded articles. Therefore, by using the vinyl chloride resin composition of the present invention, it is possible to obtain vinyl chloride resin molded articles that are suitable for automotive interior materials, such as skins for automotive instrument panels and door trims, that have excellent adhesion to foamed polyurethane molded articles. From the viewpoint of easily obtaining a vinyl chloride resin molded article that can be favorably used as an automobile interior material, for example, using the vinyl chloride resin composition of the present invention, the vinyl chloride resin composition of the present invention is preferably used for powder molding, and more preferably used for powder slush molding.

[0025] <(a) Vinyl chloride resin> The (a) vinyl chloride resin is usually a particulate vinyl chloride resin. The (a) vinyl chloride resin may contain, for example, one or more types of vinyl chloride resin particles, and may optionally further contain one or more types of vinyl chloride resin microparticles. Among these, the (a) vinyl chloride resin preferably contains at least vinyl chloride resin particles, and more preferably contains vinyl chloride resin particles and vinyl chloride resin microparticles. The vinyl chloride resin (a) can be produced by any of the conventionally known production methods, such as suspension polymerization, emulsion polymerization, solution polymerization, and bulk polymerization. In this specification, "resin particles" refers to particles having a particle diameter of 30 μm or more, and "resin fine particles" refers to particles having a particle diameter of less than 30 μm.

[0026] Examples of (a) vinyl chloride resins include homopolymers composed of vinyl chloride monomer units, as well as vinyl chloride copolymers containing preferably 50% by mass or more, more preferably 70% by mass or more, of vinyl chloride monomer units. Specific examples of monomers (comonomers) copolymerizable with vinyl chloride monomers that can constitute vinyl chloride copolymers include, for example, monomers described in International Publication No. 2016 / 098344 that do not fall under the category of (meth)acrylate monomers that can be comonomers in the vinyl chloride-(meth)acrylate copolymer (c) described below. These components may be used alone or in combination of two or more in any ratio.

[0027] <<Vinyl chloride resin particles>> In the vinyl chloride resin composition, the vinyl chloride resin particles usually function as a matrix resin (substrate). The vinyl chloride resin particles are preferably produced by a suspension polymerization method.

[0028] [Average degree of polymerization] The average degree of polymerization of the vinyl chloride resin constituting the vinyl chloride resin particles is preferably 800 or more, more preferably 1000 or more, and preferably 5000 or less, more preferably 3000 or less, and even more preferably 2800 or less. When the average degree of polymerization of the vinyl chloride resin constituting the vinyl chloride resin particles is above the above-mentioned lower limit, the physical strength of a vinyl chloride resin molded article formed using the vinyl chloride resin composition can be sufficiently ensured while, for example, improving tensile properties, particularly tensile elongation. Furthermore, a vinyl chloride resin molded article with good tensile elongation can be suitably used as an automotive interior material, such as the surface of an automobile instrument panel, which has excellent ductility and breaks as designed without scattering fragments when an airbag is inflated and deployed. Furthermore, when the average degree of polymerization of the vinyl chloride resin constituting the vinyl chloride resin particles is below the above-mentioned upper limit, the meltability of the vinyl chloride resin composition can be improved. In the present invention, the "average degree of polymerization" can be measured in accordance with JIS K6720-2.

[0029] [Average particle size] The average particle size of the vinyl chloride resin particles is usually 30 μm or more, preferably 50 μm or more, more preferably 100 μm or more, and preferably 500 μm or less, more preferably 200 μm or less. When the average particle size of the vinyl chloride resin particles is equal to or greater than the lower limit, the powder fluidity of the vinyl chloride resin composition is further improved. When the average particle size of the vinyl chloride resin particles is equal to or less than the upper limit, the meltability of the vinyl chloride resin composition is further improved, and the surface smoothness of a vinyl chloride resin molded article formed using the composition can be improved. In the present invention, the "average particle size" can be measured as a volume average particle size by a laser diffraction method in accordance with JIS Z8825.

[0030] [Content ratio] The content of vinyl chloride resin particles in (a) vinyl chloride resin is preferably 70% by mass or more, more preferably 80% by mass or more, and can be 100% by mass, and is preferably 95% by mass or less, and more preferably 90% by mass or less. This is because, when the content of vinyl chloride resin particles in (a) vinyl chloride resin is equal to or greater than the above-mentioned lower limit, the vinyl chloride resin molded article formed using the vinyl chloride resin composition can have good tensile elongation while ensuring sufficient physical strength. Also, when the content of vinyl chloride resin particles in (a) vinyl chloride resin is equal to or less than the above-mentioned upper limit, the powder flowability of the vinyl chloride resin composition is improved.

[0031] <<Vinyl chloride resin particles>> In the vinyl chloride resin composition, the vinyl chloride resin fine particles usually function as a dusting agent (powder flow improver). The vinyl chloride resin fine particles are preferably produced by emulsion polymerization.

[0032] [Average degree of polymerization] The average degree of polymerization of the vinyl chloride resin constituting the vinyl chloride resin microparticles is preferably 500 or more, more preferably 700 or more, and preferably 2600 or less, more preferably 2400 or less. When the average degree of polymerization of the vinyl chloride resin constituting the vinyl chloride resin microparticles as a dusting agent is above the above-mentioned lower limit, the powder fluidity of the vinyl chloride resin composition is improved and the tensile elongation of a molded article obtained using the composition is improved. When the average degree of polymerization of the vinyl chloride resin constituting the vinyl chloride resin microparticles is below the above-mentioned upper limit, the meltability of the vinyl chloride resin composition is improved and the surface smoothness of a vinyl chloride resin molded article formed using the composition is improved.

[0033] [Average particle size] The average particle size of the vinyl chloride resin fine particles is usually less than 30 μm, preferably 10 μm or less, more preferably 5 μm or less, and preferably 0.1 μm or more, more preferably 1 μm or more. If the average particle size of the vinyl chloride resin fine particles is equal to or greater than the above lower limit, the powder flowability of the vinyl chloride resin composition can be further improved without, for example, making the size of the particles as a dusting agent excessively small. If the average particle size of the vinyl chloride resin fine particles is equal to or less than the above upper limit, the meltability of the vinyl chloride resin composition can be further improved, and the surface smoothness of the vinyl chloride resin molded article to be formed can be further improved.

[0034] [Content ratio] The content of vinyl chloride resin microparticles in (a) vinyl chloride resin may be 0% by mass, but is preferably 5% by mass or more, more preferably 10% by mass or more, and preferably 30% by mass or less, and more preferably 20% by mass or less. This is because, if the content of vinyl chloride resin microparticles in (a) vinyl chloride resin is equal to or greater than the above-mentioned lower limit, the powder fluidity of the vinyl chloride resin composition is further improved. Also, if the content of vinyl chloride resin microparticles in (a) vinyl chloride resin is equal to or less than the above-mentioned upper limit, the physical strength of a vinyl chloride resin molded article formed using the vinyl chloride resin composition can be further increased.

[0035] <(b) Plasticizer> The (b) plasticizer is not particularly limited, but preferably contains a (b1) polyester. If the (b1) polyester is contained as the (b) plasticizer used in the vinyl chloride resin composition of the present invention, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be improved, and the heat shrinkage resistance of a laminate obtained by lining a polyurethane foam molded article with a vinyl chloride resin molded article can be improved. The (b) plasticizer may contain other plasticizers than the (b1) polyester.

[0036] <<(b1) Polyester>> The (b1) polyester contained in the (b) plasticizer is not particularly limited, and examples thereof include polyesters containing structural units derived from adipic acid (adipic acid-based polyesters), polyesters containing structural units derived from sebacic acid (sebacic acid-based polyesters), and polyesters containing structural units derived from phthalic acid (phthalic acid-based polyesters). These polyesters may be used alone or in combination of two or more in any ratio. In particular, from the viewpoint of further improving the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article and further improving the heat shrinkage resistance of a laminate obtained by backing a foamed polyurethane molded article with a vinyl chloride resin molded article, it is preferable to use, as the (b1) polyester, a polyester containing structural units derived from adipic acid, and it is particularly preferable to use a polyester containing structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol.

[0037] For convenience of explanation, the polyester containing structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol will be referred to as "polyester A" hereinafter. Here, the polyester A containing the above-mentioned predetermined structural units may have structural units other than the structural units derived from adipic acid and the structural units derived from 3-methyl-1,5-pentanediol, but the total of the structural units derived from adipic acid and the structural units derived from 3-methyl-1,5-pentanediol is preferably 50% by mass or more, more preferably 80% by mass or more, of the total structural units.Furthermore, the polyester A containing the above-mentioned predetermined structural units preferably has only the structural units derived from adipic acid and the structural units derived from 3-methyl-1,5-pentanediol as repeating units.

[0038] The polyester A containing the above-mentioned predetermined structural unit can be obtained by condensation polymerization of adipic acid and 3-methyl-1,5-pentanediol, without any particular limitation. The condensation polymerization can be carried out in the presence of a catalyst. The condensation polymerization can be carried out using an alcohol and / or a monobasic acid as a terminal-terminating component. The condensation polymerization of adipic acid and 3-methyl-1,5-pentanediol and the termination reaction of the resulting condensation polymer with the terminal-terminating component can be carried out simultaneously or separately. The product obtained through the condensation polymerization and termination reaction can be subjected to post-treatment such as distillation. The reaction conditions for the condensation polymerization, such as the amounts of the monomers, catalyst, and terminal-terminating component used, can be any known conditions. As the polyester A containing the above-mentioned predetermined structural unit, a commercially available product may be used.

[0039] The catalyst used in the condensation polymerization reaction is not particularly limited, and examples thereof include dibutyltin oxide and tetraalkyl titanate.

[0040] Examples of alcohols that can be used as end-stopping components include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, pentanol, hexanol, isohexanol, heptanol, isoheptanol, octanol, isooctanol, 2-ethylhexanol, nonanol, isononanol, decanol, isodecanol, undecanol, isoundecanol, dodecanol, tridecanol, isotridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, cellosolve, carbitol, phenol, nonylphenol, benzyl alcohol, and mixtures thereof. Additionally, examples of monobasic acids that can be used as end-stoppers include acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, pivalic acid, caproic acid, heptanoic acid, caprylic acid, 2-ethylhexyl acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, benzoic acid, and mixtures thereof. Among these, 2-ethylhexanol is preferred as the end-stopping component.

[0041] The polyester A containing the above-mentioned predetermined structural units preferably has a number average molecular weight of 1,000 or more, more preferably 2,000 or more, and preferably 10,000 or less, more preferably 7,000 or less. The "number average molecular weight" can be measured by the VPO (vapor pressure osmosis) method. Furthermore, the polyester A containing the above-mentioned predetermined structural unit preferably has an acid value of 1 mgKOH / g or less. Furthermore, the polyester A containing the above-mentioned predetermined structural unit preferably has a hydroxyl value of 30 mgKOH / g or less.

[0042] Furthermore, the polyester A containing the above-mentioned predetermined structural unit preferably has a viscosity of 500 mPa·s or more, more preferably 1000 mPa·s or more, and preferably 8000 mPa·s or less, more preferably 5000 mPa·s or less. The "viscosity" can be measured at a temperature of 23°C in accordance with JIS Z8803.

[0043] [Content ratio] The content of (b1) polyester in the (b) plasticizer is preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more. It can be 100% by mass or less, preferably 99% by mass or less, and more preferably 98% by mass or less. If the content of (b1) polyester in the (b) plasticizer is equal to or greater than the above-mentioned lower limit, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be further improved, and the heat shrinkage resistance of a laminate formed by backing a polyurethane foam molded article with a vinyl chloride resin molded article can be further improved. On the other hand, if the content of (b1) polyester in the (b) plasticizer is equal to or less than the above-mentioned upper limit, the adhesion of the vinyl chloride resin molded article to the polyurethane foam molded article can be sufficiently high, and the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article can be maintained at a high level.

[0044] [Content] The content of the (b1) polyester in the vinyl chloride resin composition is preferably 80 parts by mass or more, more preferably 90 parts by mass or more, and even more preferably 100 parts by mass or more, and preferably 200 parts by mass or less, more preferably 180 parts by mass or less, and even more preferably 150 parts by mass or less, relative to 100 parts by mass of the (a) vinyl chloride resin. If the content of the (b1) polyester in the vinyl chloride resin composition is equal to or greater than the above-mentioned lower limit, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be further improved, and the heat shrinkage resistance of a laminate formed by backing a polyurethane foam molded article with a vinyl chloride resin molded article can be further improved. On the other hand, if the content of the (b1) polyester in the vinyl chloride resin composition is equal to or less than the above-mentioned upper limit, the adhesion of the vinyl chloride resin molded article to the polyurethane foam molded article can be sufficiently high, and the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article can be maintained at a high level.

[0045] <<(b2) Other plasticizers>> The (b) plasticizer contained in the vinyl chloride resin composition may optionally contain a plasticizer other than the above-mentioned (b1) polyester (sometimes referred to as "(b2) other plasticizer").

[0046] Specific examples of the (b2) other plasticizer include the plasticizers other than the (b1) polyester described above among those described in WO 2016 / 098344. Among these, it is preferable to use epoxidized soybean oil from the viewpoint of improving the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article to be formed.

[0047] The content of the (b2) other plasticizer in the (b) plasticizer is not particularly limited, but is preferably from 0% to 5% by mass. If the content of the (b2) other plasticizer in the (b) plasticizer is within the above range, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be improved.

[0048] Furthermore, the content of the (b2) other plasticizer in the vinyl chloride resin composition is not particularly limited, but can be set to 0 to 5 parts by mass per 100 parts by mass of the (a) vinyl chloride resin.

[0049] The total content of the (b1) polyester and the (b2) other plasticizers in the vinyl chloride resin composition (i.e., the content of the (b) plasticizer) is preferably 80 parts by mass or more, more preferably 90 parts by mass or more, and even more preferably 100 parts by mass or more, and is preferably 205 parts by mass or less, more preferably 185 parts by mass or less, and even more preferably 155 parts by mass or less, relative to 100 parts by mass of the vinyl chloride resin. If the total content of the (b1) polyester and the (b2) other plasticizers in the vinyl chloride resin composition (the content of the (b) plasticizer) is within the above-mentioned range, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be improved.

[0050] <(c) Vinyl chloride-(meth)acrylate copolymer> The vinyl chloride-(meth)acrylate copolymer (c) contained in the vinyl chloride resin composition of the present invention is a copolymer obtained by copolymerizing a vinyl chloride monomer and a (meth)acrylate monomer. That is, the vinyl chloride-(meth)acrylate copolymer (c) contains structural units derived from vinyl chloride and structural units derived from (meth)acrylate.

[0051] Furthermore, since the vinyl chloride resin composition of the present invention contains (c) the vinyl chloride-(meth)acrylate copolymer, the vinyl chloride resin molded article formed can exhibit excellent adhesion to foamed polyurethane molded articles.

[0052] The "copolymerization" mentioned above may be random copolymerization, block copolymerization, or graft copolymerization. That is, the (c) vinyl chloride-(meth)acrylate copolymer may be a random copolymer, block copolymer, or graft copolymer of a vinyl chloride monomer and a (meth)acrylate monomer. From the viewpoint of further improving the adhesion of the resulting vinyl chloride resin molded article to a foamed polyurethane molded article, the (c) vinyl chloride-(meth)acrylate copolymer is preferably a graft copolymer of a vinyl chloride monomer and a (meth)acrylate monomer.

[0053] It should be noted that (c) vinyl chloride-(meth)acrylate copolymer is a component different from the above-mentioned (a) vinyl chloride resin.

[0054] Here, the (meth)acrylate monomer copolymerizable with the vinyl chloride monomer is not particularly limited, and examples thereof include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, t-butyl acrylate, isobutyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, n-tetradecyl acrylate, n-hexadecyl acrylate, cyclohexyl acrylate, 2-acryloyloxyethyl succinate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, trimethylolpropane triacrylate, ethylene oxide-modified trimethylolpropane triacrylate, and the like. Examples of the (meth)acrylate monomer include acrylate compounds such as dipentaerythritol hexaacrylate, methyl methacrylate, ethyl methacrylate, n-hexyl methacrylate, n-tetradecyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, n-decyl methacrylate, n-dodecyl methacrylate, 2-hydroxyethyl methacrylate, trimethylolpropane trimethacrylate, ethylene oxide-modified trimethylolpropane trimethacrylate, pentaerythritol tetramethacrylate, and dipentaerythritol hexamethacrylate. These (meth)acrylate monomers may be used alone or in combination of two or more at any ratio.

[0055] As a method for copolymerizing a vinyl chloride monomer and a (meth)acrylate monomer, known polymerization methods such as emulsion polymerization and suspension polymerization can be used.

[0056] Furthermore, when a vinyl chloride monomer and a (meth)acrylate monomer are copolymerized to form (c) a vinyl chloride-(meth)acrylate copolymer, a comonomer other than the vinyl chloride monomer and the (meth)acrylate monomer may be used. That is, the (c) vinyl chloride-(meth)acrylate copolymer may contain structural units other than the vinyl chloride-derived structural units and the (meth)acrylate-derived structural units.

[0057] The proportion of (meth)acrylate-derived structural units in the (c) vinyl chloride-(meth)acrylate copolymer is preferably 3% by mass or more, more preferably 5% by mass or more, even more preferably 7% by mass or more, even more preferably 15% by mass or more, and preferably 80% by mass or less, more preferably 60% by mass or less, even more preferably 50% by mass or less, and even more preferably 35% by mass or less. If the proportion of (meth)acrylate-derived structural units in the (c) vinyl chloride-(meth)acrylate copolymer is above the above-mentioned lower limit, the resulting vinyl chloride resin molded article can have improved adhesion to a polyurethane foam molded article, and the tensile properties (e.g., tensile elongation, tensile strength, etc.) of the vinyl chloride resin molded article can be improved. On the other hand, if the proportion of (meth)acrylate-derived structural units in the (c) vinyl chloride-(meth)acrylate copolymer is below the above-mentioned upper limit, the tensile properties (e.g., tensile elongation, tensile strength, etc.) of the resulting vinyl chloride resin molded article can be improved.

[0058] Furthermore, the degree of polymerization of the (c) vinyl chloride-(meth)acrylate copolymer is preferably 600 or more, more preferably 650 or more, and even more preferably 700 or more, and is preferably 1500 or less, more preferably 1200 or less, and even more preferably 1000 or less. If the degree of polymerization of the (c) vinyl chloride-(meth)acrylate copolymer is within the above-mentioned range, the adhesion of the resulting vinyl chloride resin molded article to a foamed polyurethane molded article can be further improved, and the tensile properties (e.g., tensile elongation and tensile strength) of the vinyl chloride resin molded article can be improved.

[0059] The vinyl chloride-(meth)acrylate copolymer (c) is usually present as particles in the vinyl chloride resin composition. The average particle size of the (c) vinyl chloride-(meth)acrylate copolymer particles is preferably 10 μm or more, more preferably 30 μm or more, and even more preferably 50 μm or more, and is preferably 200 μm or less, more preferably 180 μm or less, and even more preferably 160 μm or less. If the average particle size of the (c) vinyl chloride-(meth)acrylate copolymer particles is within the above-mentioned range, the adhesion of the resulting vinyl chloride resin molded product to the foamed polyurethane molded product can be further improved.

[0060] Furthermore, the melting point of the (c) vinyl chloride-(meth)acrylate copolymer is preferably 250°C or lower, more preferably 240°C or lower, and even more preferably 230°C or lower, and is preferably 180°C or higher, more preferably 190°C or higher, and even more preferably 200°C or higher. If the melting point of the (c) vinyl chloride-(meth)acrylate copolymer is below the above upper limit, when the vinyl chloride resin composition is molded into, for example, a sheet, the particles of the (c) vinyl chloride-(meth)acrylate copolymer melt well on the surface that was in contact with the mold, thereby maintaining a good appearance of the resulting vinyl chloride resin molded article. On the other hand, if the melting point of the (c) vinyl chloride-(meth)acrylate copolymer is above the above lower limit, when the vinyl chloride resin composition is molded into, for example, a sheet, the particles of the (c) vinyl chloride-(meth)acrylate copolymer remain in a moderate amount on the surface opposite to the surface that was in contact with the mold and can function as adhesion points, thereby further improving the adhesion of the resulting vinyl chloride resin molded article to a foamed polyurethane molded article. In the present invention, the melting point of the (c) vinyl chloride-(meth)acrylate copolymer can be confirmed by the presence or absence of particles of the (c) vinyl chloride-(meth)acrylate copolymer on the surface of a vinyl chloride resin molded article obtained by molding a vinyl chloride resin composition. For example, when the maximum temperature of the mold used in molding the vinyl chloride resin composition is T°C, if particles of the (c) vinyl chloride-(meth)acrylate copolymer are not present on the surface of the obtained sheet-like vinyl chloride resin molded article that was in contact with the mold, and particles of the (c) vinyl chloride-(meth)acrylate copolymer are present on the surface opposite to the side that was in contact with the mold, it can be confirmed that the melting point of the (c) vinyl chloride-(meth)acrylate copolymer is T-30°C or higher and T°C or lower. For example, when the maximum temperature of the mold used in molding the vinyl chloride resin composition is 250°C, if particles of the (c) vinyl chloride-(meth)acrylate copolymer are not present on the surface of the obtained sheet-like vinyl chloride resin molded article that was in contact with the mold, and particles of the (c) vinyl chloride-(meth)acrylate copolymer are present on the surface opposite to the side that was in contact with the mold, it can be confirmed that the melting point of the (c) vinyl chloride-(meth)acrylate copolymer is in the range of 220°C or higher and 250°C or lower.

[0061] In addition, as the (c) vinyl chloride-(meth)acrylate copolymer, commercially available products can also be used, such as "AG-40M," "AG-162E," "AG-72P," and "AG-64T" (all manufactured by Sekisui Chemical Co., Ltd.).

[0062] The content of the (c) vinyl chloride-(meth)acrylate copolymer in the vinyl chloride resin composition is preferably 0.5 parts by mass or more, more preferably 0.8 parts by mass or more, even more preferably 1.2 parts by mass or more, even more preferably 2 parts by mass or more, even more preferably 2.7 parts by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, even more preferably 6 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the vinyl chloride resin. If the content of the (c) vinyl chloride-(meth)acrylate copolymer in the vinyl chloride resin composition is equal to or greater than the above-mentioned lower limit, the adhesion of the resulting vinyl chloride resin molded article to a foamed polyurethane molded article can be further improved. On the other hand, if the content of the (c) vinyl chloride-(meth)acrylate copolymer in the vinyl chloride resin composition is equal to or less than the above-mentioned upper limit, the tensile properties (e.g., tensile elongation and tensile strength) of the resulting vinyl chloride resin molded article can be improved.

[0063] <Additives> The vinyl chloride resin composition of the present invention may further contain various additives in addition to the above-mentioned components. The additives are not particularly limited, and examples thereof include lubricants, stabilizers such as perchloric acid-treated hydrotalcite, zeolite, β-diketone, and fatty acid metal salts, mold release agents, dusting agents other than the above-mentioned vinyl chloride resin fine particles, impact modifiers, perchloric acid compounds other than perchloric acid-treated hydrotalcite (e.g., sodium perchlorate and potassium perchlorate), antioxidants, mildew inhibitors, flame retardants, antistatic agents, fillers, light stabilizers, foaming agents, and pigments.

[0064] The additives that may be contained in the vinyl chloride resin composition of the present invention include, for example, those described in WO 2016 / 098344, and the preferred content thereof may also be the same as that described in WO 2016 / 098344.

[0065] <Method for preparing vinyl chloride resin composition> The vinyl chloride resin composition of the present invention can be prepared by mixing the above-mentioned components. The method for mixing the (a) vinyl chloride resin, (b) plasticizer, (c) vinyl chloride-(meth)acrylate copolymer, and various additives, if necessary, is not particularly limited. For example, components other than the dusting agent (including vinyl chloride resin microparticles) and the (c) vinyl chloride-(meth)acrylate copolymer are mixed by dry blending, and then the dusting agent and the (c) vinyl chloride-(meth)acrylate copolymer are added and mixed. A Henschel mixer is preferably used for dry blending. The temperature during dry blending is not particularly limited, but is preferably 50°C or higher, more preferably 70°C or higher, and preferably 200°C or lower. In order to further improve the adhesion of the vinyl chloride resin molded article to the foamed polyurethane molded article, the temperature when adding and mixing (c) the vinyl chloride-(meth)acrylate copolymer is preferably 90°C or lower.

[0066] <Uses of vinyl chloride resin compositions> The vinyl chloride resin composition thus obtained can be suitably used for powder molding, and more suitably used for powder slush molding.

[0067] (Vinyl chloride resin molded body) The vinyl chloride resin molded article of the present invention is characterized in that it is obtained by molding the above-mentioned vinyl chloride resin composition by any method. Since the vinyl chloride resin molded article of the present invention is formed using the above-mentioned vinyl chloride resin composition, it usually contains at least (a) vinyl chloride resin, (b) plasticizer, and (c) vinyl chloride-(meth)acrylate copolymer, and has excellent adhesion to foamed polyurethane molded articles. Therefore, a laminate formed by backing a foamed polyurethane molded body on the vinyl chloride resin molded body of the present invention can be suitably used as an automobile interior material such as the skin of an automobile instrument panel, because the vinyl chloride resin molded body and the foamed polyurethane molded body are well bonded and difficult to peel off.

[0068] <Method for forming vinyl chloride resin molded body> When a vinyl chloride resin molded article is formed by powder slush molding, the mold temperature during powder slush molding is not particularly limited, but is preferably 200°C or higher, more preferably 220°C or higher, and is preferably 300°C or lower, more preferably 280°C or lower.

[0069] The vinyl chloride resin molded article can be produced by any method, including, but not limited to, the following method. Specifically, the vinyl chloride resin composition of the present invention is sprinkled onto a mold at a temperature within the above range, and the mold is left standing for 5 to 30 seconds. The excess vinyl chloride resin composition is then shaken off, and the mold is then left standing at a given temperature for 30 seconds to 3 minutes. The mold is then cooled to 10 to 60°C, and the resulting vinyl chloride resin molded article of the present invention is then demolded from the mold. A sheet-like molded article conforming to the shape of the mold is then obtained.

[0070] Here, it is preferable that the above-mentioned (c) vinyl chloride-(meth)acrylate copolymer particles are present on one surface of the obtained sheet-like vinyl chloride resin molded product. The (c) vinyl chloride-(meth)acrylate copolymer particles present on the surface of the vinyl chloride resin molded product function as adhesion points, thereby further improving the adhesion of the vinyl chloride resin molded product to the foamed polyurethane molded product. Furthermore, it is preferable that the (c) vinyl chloride-(meth)acrylate copolymer particles are not present on the other surface of the sheet-like vinyl chloride resin molded product. The absence of the (c) vinyl chloride-(meth)acrylate copolymer particles allows the other surface to have a good appearance. For example, in the method for forming a vinyl chloride resin molded article described above, it is preferable that the (c) vinyl chloride-(meth)acrylate copolymer is sufficiently heated and melted on the surface that was in contact with the mold, so that no particles of the (c) vinyl chloride-(meth)acrylate copolymer remain. If no particles of the (c) vinyl chloride-(meth)acrylate copolymer are present on the surface of the formed sheet-like vinyl chloride resin molded article that was in contact with the mold, the surface that was in contact with the mold can be used as the surface of an automotive interior material, for example, to obtain an automotive interior material with a good surface appearance. On the other hand, it is preferable that particles of the (c) vinyl chloride-(meth)acrylate copolymer remain on the surface opposite to the surface that was in contact with the mold, because the heating temperature is slightly lower than that of the surface that was in contact with the mold. If particles of the (c) vinyl chloride-(meth)acrylate copolymer are present on the surface of the formed sheet-like vinyl chloride resin molded article that is opposite to the surface that was in contact with the mold, when a foamed polyurethane molded article is backed (laminated) on the surface opposite to the surface that was in contact with the mold to form a laminate, the vinyl chloride resin molded article and the foamed polyurethane molded article can be well bonded to each other. At least a portion of the particles of (c) vinyl chloride-(meth)acrylate copolymer present on the surface of the vinyl chloride resin molded article may protrude from the surface of the vinyl chloride resin molded article.

[0071] (Laminate) The laminate of the present invention comprises a polyurethane foam molded article and the vinyl chloride resin molded article described above. The vinyl chloride resin molded article usually constitutes one surface of the laminate. Furthermore, since the laminate of the present invention includes, for example, a vinyl chloride resin molded article formed using the vinyl chloride resin composition of the present invention, the vinyl chloride resin molded article and the polyurethane foam molded article are well bonded to each other. Therefore, the laminate of the present invention is suitable for use as an automobile interior part, particularly as an automobile interior material for forming an automobile instrument panel.

[0072] Here, the method for laminating a polyurethane foam molded body and a vinyl chloride resin molded body is not particularly limited, and the following methods can be used, for example: (1) a method in which a polyurethane foam molded body and a vinyl chloride resin molded body are separately prepared and then bonded together by heat fusion, heat adhesion, or using a known adhesive; (2) a method in which isocyanates and polyols, which are raw materials for the polyurethane foam molded body, are reacted on the vinyl chloride resin molded body to polymerize, and the polyurethane is foamed by a known method, thereby directly forming a polyurethane foam molded body on the vinyl chloride resin molded body; etc. Among these, the latter method (2) is preferred because of its simple process and the ease with which the vinyl chloride resin molded body and the polyurethane foam molded body can be firmly bonded together even when laminates of various shapes are obtained. [Example]

[0073] The present invention will be specifically described below based on examples, but the present invention is not limited to these examples. In the following description, "%" and "parts" representing amounts are based on mass unless otherwise specified. The low-temperature tensile elongation, low-temperature tensile strength, and adhesion to a polyurethane foam molded product of the vinyl chloride resin molded sheet, as well as the heat shrinkage resistance of the laminate, were measured and evaluated by the following methods. The presence or absence of vinyl chloride-(meth)acrylate copolymer particles on the front and back surfaces of the vinyl chloride resin molded sheet was confirmed by the following method.

[0074] <Low temperature tensile elongation and low temperature tensile strength> <<Before heating (initial stage)>> The obtained vinyl chloride resin molded sheet was punched out with a No. 1 dumbbell as specified in JIS K6251, and the tensile elongation at break (%) and tensile stress at break (MPa) were measured at a low temperature of -35°C at a pulling rate of 200 mm / min in accordance with JIS K7113. The larger the tensile elongation at break value, the better the vinyl chloride resin molded sheet's tensile elongation at low temperatures (low-temperature tensile elongation) before heating (initial stage). Also, the larger the tensile stress at break value, the better the vinyl chloride resin molded sheet's tensile strength at low temperatures (low-temperature tensile strength) before heating (initial stage). <<After heating (thermal aging test)>> A laminate backed by a polyurethane foam molded body was used as a sample. The sample was placed in an oven and heated for 100 hours in an environment at a temperature of 130°C. Next, the polyurethane foam molded body was peeled off from the heated laminate to prepare only a vinyl chloride resin molded sheet. Then, under the same conditions as in the initial case, the tensile elongation at break (%) and tensile stress at break (MPa) of the vinyl chloride resin molded sheet after 100 hours of heating were measured. The larger the tensile elongation at break value, the better the vinyl chloride resin molded sheet's low-temperature tensile elongation after heating. Furthermore, the larger the tensile stress at break value, the better the vinyl chloride resin molded sheet's low-temperature tensile strength after heating.

[0075] <Adhesion to foamed polyurethane molded products> The laminate backed with a polyurethane foam molded body was cut into a size of 200 mm long x 25 mm wide to prepare a test specimen. The peel force (N / 25 mm) between the vinyl chloride resin molded sheet and the polyurethane foam molded body in this test specimen was measured using a tensile tester (Shimadzu Corporation, product name "AG-20KNISD") at a peel speed of 200 mm / min and a peel angle of 180°. A higher peel force value indicates better adhesion of the vinyl chloride resin molded sheet to the polyurethane foam molded body.

[0076] <Heat shrink resistance> The length of the laminate backed with the polyurethane foam molding in the transverse direction was measured using a coordinate measuring machine (Mitutoyo Corporation, "Crysta-Plus M443"), and this was recorded as the actual measured value before heating. Subsequently, as an accelerated test simulating long-term use, the laminate was stored and heated in a gear oven (Toyo Seiki Seisakusho Co., Ltd., "Gear Oven") at 130°C. After 100 hours, the laminate was removed from the oven, and the length of the laminate in the transverse direction was measured using the coordinate measuring machine, and this was recorded as the actual measured value after heating. The measured values ​​before and after heating were used to calculate the thermal shrinkage percentage, as shown in the following formula. The smaller the thermal shrinkage percentage, the smaller the thermal shrinkage of the laminate, and the more excellent the laminate's heat shrinkage resistance. Heat shrinkage rate = 100 x (measured value before heating - measured value after heating) / measured value before heating

[0077] <Presence or absence of vinyl chloride-(meth)acrylate copolymer particles> The presence or absence of vinyl chloride-(meth)acrylate copolymer particles on the front and back surfaces of the vinyl chloride resin molded sheet was confirmed by visual observation. Note that the "front surface" of the vinyl chloride resin molded sheet refers to the textured surface that was in contact with the mold, and the "back surface" of the vinyl chloride resin molded sheet refers to the surface opposite the textured surface that was in contact with the mold (i.e., the surface that will back the foamed polyurethane molded body).

[0078] (Manufacturing example) The polyesters used in the examples and comparative examples were prepared as follows. <Polyester A> Adipic acid as a polycarboxylic acid, 3-methyl-1,5-pentanediol as a polyhydric alcohol, and 2-ethylhexanol as a stopper (terminal termination component) were charged into a reaction vessel, and tetraisopropyl titanate was added as a catalyst. A solvent was added as appropriate, and the mixture was heated with stirring. The by-product water was removed under normal and reduced pressure, and the temperature was finally raised to 220-230 °C to complete the dehydration condensation reaction. The resulting product was subjected to thin-film distillation under pressures of 4-80 Pa and an external temperature of 250 °C to obtain polyester A (viscosity: 3600 mPa·s, number-average molecular weight: 5300, acid value: 0.32 mg KOH / g, hydroxyl value: 12.7 mg KOH / g) with 2-ethylhexoxy groups at the termini.

[0079] Example 1 <Preparation of vinyl chloride resin composition> Of the ingredients listed in Table 1, all but the plasticizer (Polyester A and epoxidized soybean oil), the vinyl chloride resin microparticles (dusting agent), and the vinyl chloride-(meth)acrylate copolymer were mixed in a Henschel mixer. When the temperature of the mixture reached 80°C, all of the plasticizer was added, and the mixture was allowed to dry up (referring to the state in which the plasticizer was absorbed into the vinyl chloride resin particles, which are the vinyl chloride resin, and the mixture became smooth). When the dried-up mixture was cooled to a temperature of 90°C or below, the vinyl chloride resin microparticles (dusting agent) and the vinyl chloride-(meth)acrylate copolymer were added, preparing a vinyl chloride resin composition. <Formation of vinyl chloride resin molded body> A vinyl chloride resin molded sheet having dimensions of 200 mm x 300 mm x 1 mm was prepared as follows. Specifically, the vinyl chloride resin composition obtained above was sprinkled onto a textured mold heated to a temperature of 250°C, left to melt for a desired period of time, and then the excess vinyl chloride resin composition was shaken off. The textured mold onto which the vinyl chloride resin composition had been sprinkled was then placed in an oven set to a temperature of 200°C, and 60 seconds after being placed thereon, the textured mold was cooled with cooling water. When the mold temperature had cooled to 40°C, a vinyl chloride resin molded sheet serving as a vinyl chloride resin molded article was released from the mold. The obtained vinyl chloride resin molded sheets (dimensions: 200 mm × 300 mm × 1 mm) were measured and evaluated for low-temperature tensile elongation and low-temperature tensile strength before heating (initial stage) according to the methods described above. The presence or absence of vinyl chloride-(meth)acrylate copolymer particles on the front and back surfaces of the vinyl chloride resin molded sheets was also confirmed according to the methods described above. The results are shown in Table 1. <Formation of laminate> The obtained vinyl chloride resin molded sheet (dimensions: 200 mm x 300 mm x 1 mm) was placed in a mold of 200 mm x 300 mm x 10 mm with the textured surface facing downwards. Separately, a polyol mixture was prepared by mixing 50 parts of a propylene glycol PO (propylene oxide)·EO (ethylene oxide) block adduct (hydroxyl value 28 mg KOH / g, terminal EO unit content = 10%, internal EO unit content = 4%), 50 parts of a glycerin PO·EO block adduct (hydroxyl value 21 mg KOH / g, terminal EO unit content = 14%), 2.5 parts of water, 0.2 parts of an ethylene glycol solution of triethylenediamine (manufactured by Tosoh Corporation, trade name "TEDA-L33"), 1.2 parts of triethanolamine, 0.5 parts of triethylamine, and 0.5 parts of a foam stabilizer (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "F-122"), and a mixture of the resulting polyol mixture and polymethylene polyphenylene polyisocyanate (polymeric MDI) at a ratio of 98. The prepared mixture was then poured onto a vinyl chloride resin molded sheet placed in a mold as described above. The mold was then covered with an aluminum plate measuring 348 mm x 255 mm x 10 mm, and the mold was then sealed. The mold was left for 5 minutes after sealing, and a polyurethane foam molded body (thickness: 9 mm, density: 0.2 g / cm) was formed on the vinyl chloride resin molded sheet (thickness: 1 mm) as a skin. 3 ) backed laminate was formed. The laminate was then removed from the mold, and the adhesion of the vinyl chloride resin molded sheet to the polyurethane foam molded article was measured and evaluated according to the method described above. The results are shown in Table 1.

[0080] Examples 2 to 8 Vinyl chloride resin compositions, vinyl chloride resin molded articles, and laminates were prepared in the same manner as in Example 1, except that the type and amount of vinyl chloride-(meth)acrylate copolymer added was changed as shown in Table 1. Measurements and evaluations were then carried out in the same manner as in Example 1. In Examples 4 to 6, the obtained laminates were used to measure and evaluate the low-temperature tensile elongation and low-temperature tensile strength of the vinyl chloride resin molded sheets after heating, according to the methods described above. Furthermore, in Examples 5 and 6, the heat shrinkage resistance of the obtained laminates was also measured and evaluated according to the methods described above. The results are shown in Table 1.

[0081] (Comparative Example 1) A vinyl chloride resin composition, a vinyl chloride resin molded article, and a laminate were prepared in the same manner as in Example 1, except that the vinyl chloride-(meth)acrylate copolymer was not added. Measurements and evaluations were then carried out in the same manner as in Example 1. Using the resulting laminate, the low-temperature tensile elongation and low-temperature tensile strength of the vinyl chloride resin molded sheet after heating, as well as the heat shrinkage resistance of the laminate, were also measured and evaluated according to the methods described above. The results are shown in Table 1.

[0082] [Table 1]

[0083] 1) Shin-Daiichi Vinyl Corporation, product name "ZEST (registered trademark) 2000Z" (prepared by suspension polymerization method, average degree of polymerization: 2000, average particle size: 130 μm) 2) Shin-Daiichi Vinyl Corporation, product name "ZEST PQLTX" (prepared by emulsion polymerization, average degree of polymerization: 800, average particle size: 1.8 μm) 3) ADEKA Corporation, product name "ADEKA Cizer O-130S" 4) Kyowa Chemical Industry Co., Ltd., product name: Alcamizer (registered trademark) 5 5) Mizusawa Industrial Chemicals, product name "MIZUKALIZER DS" 6) Showa Denko Co., Ltd., product name "Karenz DK-1" 7) Sakai Chemical Industry Co., Ltd., product name "SAKAI SZ2000" 8) ADEKA Corporation, product name "ADEKA STAB LA-72" 9) ADEKA Corporation, product name "ADEKA STAB SC-131" 10) ADEKA Corporation, product name "ADEKA STAB LS-12" 11) Sekisui Chemical Co., Ltd., product name "AG-40M" (graft copolymer of vinyl chloride and (meth)acrylate, average particle size: 120 μm) 12) Sekisui Chemical Co., Ltd., product name "AG-162E" (graft copolymer of vinyl chloride and (meth)acrylate, average particle size: 90 μm) 13) Sekisui Chemical Co., Ltd., product name "AG-72P" (graft copolymer of vinyl chloride and (meth)acrylate, average particle size: 120 μm) 14) Sekisui Chemical Co., Ltd., product name "AG-64T" (graft copolymer of vinyl chloride and (meth)acrylate, average particle size: 100 μm) 15) Dainichi Seika Chemicals Co., Ltd., product name "DA PX 1720(A) Black"

[0084] Table 1 shows that the vinyl chloride resin compositions of Examples 1 to 8, which contain a vinyl chloride resin, a plasticizer, and a vinyl chloride-(meth)acrylate copolymer, can form vinyl chloride resin molded articles that have excellent adhesion to foamed polyurethane molded articles. On the other hand, it is clear that the vinyl chloride resin molded article formed using the vinyl chloride resin composition of Comparative Example 1, which does not contain a vinyl chloride-(meth)acrylate copolymer, has poor adhesion to foamed polyurethane molded articles. [Industrial Applicability]

[0085] According to the present invention, it is possible to provide a vinyl chloride resin composition capable of forming a vinyl chloride resin molded article having excellent adhesion to a polyurethane foam molded article. Furthermore, according to the present invention, it is possible to provide a vinyl chloride resin molded article that has excellent adhesion to a polyurethane foam molded article. Furthermore, according to the present invention, it is possible to provide a laminate in which a vinyl chloride resin molded article and a polyurethane foam molded article are well bonded to each other.

Claims

1. A vinyl chloride resin composition comprising a vinyl chloride resin, a plasticizer, and a vinyl chloride-(meth)acrylate copolymer, the plasticizer contains a polyester having a number average molecular weight of 2,000 or more and 7,000 or less, A vinyl chloride resin composition, wherein the content of the polyester in the vinyl chloride resin composition is 80 parts by mass or more and 200 parts by mass or less per 100 parts by mass of the vinyl chloride resin.

2. 2. The vinyl chloride resin composition according to claim 1, wherein the content of the vinyl chloride-(meth)acrylate copolymer is 0.5 parts by mass or more and 10 parts by mass or less per 100 parts by mass of the vinyl chloride resin.

3. 3. The vinyl chloride resin composition according to claim 1, wherein the proportion of structural units derived from (meth)acrylate in the vinyl chloride-(meth)acrylate copolymer is 3% by mass or more and 50% by mass or less.

4. 2. The vinyl chloride resin composition according to claim 1, wherein the polyester contains structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol.

5. The vinyl chloride resin composition according to any one of claims 1 to 4, which is used for powder molding.

6. The vinyl chloride resin composition according to any one of claims 1 to 5, which is used in powder slush molding.

7. A vinyl chloride resin molded article obtained by molding the vinyl chloride resin composition according to any one of claims 1 to 6.

8. 8. The vinyl chloride resin molded article according to claim 7, which is used for an automobile instrument panel skin.

9. A sheet-shaped vinyl chloride resin molded body, 9. The vinyl chloride resin molded article according to claim 7, wherein the particles of the vinyl chloride-(meth)acrylate copolymer are present on one surface of the sheet-like vinyl chloride resin molded article.

10. A laminate comprising a polyurethane foam molded article and the vinyl chloride resin molded article according to any one of claims 7 to 9.

11. The laminate according to claim 10, which is used for an automobile instrument panel.

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