Vinyl chloride resin composition for powder molding, vinyl chloride resin molded body and laminate

Abstract

The purpose of the present invention is to provide: a vinyl chloride resin composition for powder molding, which is capable of forming a vinyl chloride resin molded body having excellent alcohol resistance and low temperature flexibility. This vinyl chloride resin composition for powder molding contains (a) a vinyl chloride resin and (b) a 3-methyl-1,5-pentane diol sebacic acid polyester containing a structural unit derived from sebacic acid and a structural unit derived from 3-methyl-1,5-pentane diol. This vinyl chloride resin composition for powder molding is preferably used in powder slush molding.

Description

[Technical Field]

[0001] The present invention relates to a vinyl chloride resin composition for powder molding, 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 Documents 1 and 2).

[0004] Specifically, for example, Patent Document 1 discloses a laminate having a vinyl chloride resin molded article obtained by powder molding a vinyl chloride resin composition for powder molding, which contains a vinyl chloride resin, a trimellitic acid ester, and a polyester containing structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol.

[0005] Furthermore, for example, in Patent Document 2, 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]

[0006] [Patent Document 1] International Publication No. 2020 / 090556 [Patent Document 2] Japanese Patent Application Publication No. 8-291243 Summary of the Invention [Problem to be solved by the invention]

[0007] Here, since the surface of an automobile interior part may be wiped with alcohol to maintain good hygiene, vinyl chloride resin molded articles used as the surface of an automobile interior part or the like are required to have excellent alcohol resistance.

[0008] However, the vinyl chloride resin molded articles obtained by powder slush molding of the above-mentioned conventional vinyl chloride resin compositions have room for improvement in alcohol resistance.

[0009] Furthermore, vinyl chloride resin molded articles obtained by powder slush molding of vinyl chloride resin compositions are required to have excellent low-temperature flexibility.

[0010] Therefore, an object of the present invention is to provide a vinyl chloride resin composition for powder molding that can form vinyl chloride resin molded articles that have excellent alcohol resistance and low-temperature flexibility. Another object of the present invention is to provide a vinyl chloride resin molded article and laminate that are excellent in alcohol resistance and low-temperature flexibility. [Means for solving the problem]

[0011] The present inventors have conducted extensive research to solve the above problems, and have found that a vinyl chloride resin molded article having excellent alcohol resistance and low-temperature flexibility can be obtained by powder molding a vinyl chloride resin composition for powder molding that uses a sebacate polyester as a plasticizer, thereby completing the present invention.

[0012] That is, the present invention has an object to advantageously solve the above-mentioned problems, and the vinyl chloride resin composition for powder molding of the present invention is characterized by comprising (a) a vinyl chloride resin and (b) a sebacic acid polyester which contains structural units derived from sebacic acid and structural units derived from 3-methyl-1,5-pentanediol, has a terminal structure derived from 2-ethylhexanol, and is obtained by thin-film distillation. Thus, when the vinyl chloride resin composition for powder molding contains the sebacic acid polyester, the alcohol resistance and low-temperature flexibility of a vinyl chloride resin molded article obtained by powder molding the vinyl chloride resin composition for powder molding can be improved.

[0013] Furthermore, the vinyl chloride resin composition for powder molding of the present invention preferably contains (b) sebacic acid polyester in an amount of 5 to 200 parts by mass per 100 parts by mass of (a) vinyl chloride resin. When the content of sebacic acid polyester is within the above range, the alcohol resistance and low-temperature flexibility of a vinyl chloride resin molded article obtained by powder molding the vinyl chloride resin composition for powder molding can be further improved.

[0014] Furthermore, the vinyl chloride resin composition for powder molding of the present invention may further contain (c) an additional ester other than the sebacate polyester. If the vinyl chloride resin composition for powder molding further contains an additional ester in this manner, the powder flowability of the vinyl chloride resin composition for powder molding can be further improved.

[0015] Furthermore, the vinyl chloride resin composition for powder molding of the present invention preferably contains (b) sebacic acid polyester in an amount of 5 to 99 parts by mass per 100 parts by mass of all plasticizers. When the content of sebacic acid polyester is within the above range, the alcohol resistance and low-temperature flexibility of a vinyl chloride resin molded article obtained by powder molding the vinyl chloride resin composition for powder molding can be further improved.

[0016] Another object of the present invention is to advantageously solve the above-mentioned problems, and the vinyl chloride resin molded article of the present invention is characterized by being obtained by powder molding (e.g., powder slush molding) any of the above-mentioned vinyl chloride resin compositions for powder molding. The vinyl chloride resin molded article obtained by powder molding the above-mentioned vinyl chloride resin composition for powder molding has excellent alcohol resistance and low-temperature flexibility.

[0017] The vinyl chloride resin molded article of the present invention is preferably used for the surface of an automobile interior part, because when the vinyl chloride resin molded article is used for the surface of an automobile interior part, it is possible to produce an automobile interior part such as an automobile instrument panel that is less susceptible to deterioration by alcohol and has high low-temperature flexibility.

[0018] Furthermore, the present invention aims to advantageously solve the above-mentioned problems, and provides a laminate comprising a polyurethane foam molded body and any one of the vinyl chloride resin molded bodies described above. A laminate comprising a polyurethane foam molded body and the vinyl chloride resin molded body described above is resistant to deterioration by alcohol and has high low-temperature flexibility, and can be suitably used as an automotive interior material used in the manufacture of automotive interior parts such as automotive instrument panels. [Effects of the Invention]

[0019] According to the vinyl chloride resin composition for powder molding of the present invention, it is possible to form a vinyl chloride resin molded article having excellent alcohol resistance and low-temperature flexibility. Furthermore, according to the present invention, it is possible to provide a vinyl chloride resin molded article and laminate that are excellent in alcohol resistance and low-temperature flexibility. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described in detail. The vinyl chloride resin composition for powder molding of the present invention can be used, for example, when powder molding the vinyl chloride resin molded article of the present invention. And the vinyl chloride resin molded article powder-molded using the vinyl chloride resin composition for powder molding of the present invention can be suitably used, for example, as an automobile interior material such as the skin 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.

[0021] (Vinyl chloride resin composition for powder molding) The vinyl chloride resin composition for powder molding of the present invention comprises (a) a vinyl chloride resin containing vinyl chloride resin particles and (b) a sebacic acid polyester containing structural units derived from sebacic acid and structural units derived from 3-methyl-1,5-pentanediol, having a terminal structure derived from 2-ethylhexanol, and obtained by thin-film distillation. The vinyl chloride resin composition for powder molding of the present invention may further comprise (c) an additional ester other than the sebacic acid polyester. The vinyl chloride resin composition for powder molding of the present invention may also optionally comprise other additives. Because the vinyl chloride resin composition for powder molding of the present invention contains at least the above-mentioned (a) vinyl chloride resin and (b) sebacic acid polyester, the composition can be used to powder-mold vinyl chloride resin molded articles with excellent alcohol resistance and low-temperature flexibility. Therefore, the vinyl chloride resin composition for powder molding of the present invention can be used to obtain vinyl chloride resin molded articles suitable for automotive interior materials, such as automotive instrument panel skins and door trim skins, which have excellent alcohol resistance and low-temperature flexibility. From the viewpoint of easily obtaining vinyl chloride resin molded articles that can be favorably used as automotive interior materials, for example, using the vinyl chloride resin composition for powder molding of the present invention, it is preferable that the vinyl chloride resin composition for powder molding of the present invention be used in powder slush molding.

[0022] <(a) Vinyl chloride resin> The (a) vinyl chloride resin is usually a particulate vinyl chloride resin, and the (a) vinyl chloride resin contains one or more types of vinyl chloride resin particles, and may optionally further contain one or more types of vinyl chloride resin fine particles. 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.

[0023] Examples of the (a) vinyl chloride resin include a homopolymer composed of vinyl chloride monomer units, as well as a vinyl chloride copolymer 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 those described in International Publication No. 2016 / 098344. These components may be used alone or in combination of two or more in any ratio.

[0024] <<Vinyl chloride resin particles>> In the vinyl chloride resin composition for powder molding, 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.

[0025] [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 body formed using the vinyl chloride resin composition for powder molding can be sufficiently ensured, while, for example, tensile properties, particularly tensile elongation, can be improved. Furthermore, a vinyl chloride resin molded body 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 for powder molding can be improved. In the present invention, the "average degree of polymerization" can be measured in accordance with JIS K6720-2.

[0026] [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. If the average particle size of the vinyl chloride resin particles is equal to or greater than the above-mentioned lower limit, the powder flowability of the vinyl chloride resin composition for powder molding is further improved. If the average particle size of the vinyl chloride resin particles is equal to or less than the above-mentioned upper limit, the meltability of the vinyl chloride resin composition for powder molding is further improved, and the surface smoothness of the 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.

[0027] [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, if 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 for powder molding can have good tensile elongation while ensuring sufficient physical strength. Also, if 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 for powder molding is improved.

[0028] <<Vinyl chloride resin particles>> In the vinyl chloride resin composition for powder molding, 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.

[0029] [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 2000 or less, more preferably 1800 or less. If 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 for powder molding will be improved, and the tensile elongation of molded articles obtained using the composition will be improved. If 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 for powder molding will be improved, and the surface smoothness of vinyl chloride resin molded articles formed using the composition will be improved.

[0030] [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-mentioned lower limit, the powder flowability of the vinyl chloride resin composition for powder molding can be further improved, for example, without excessively reducing the size of the composition as a dusting agent. If the average particle size of the vinyl chloride resin fine particles is equal to or less than the above-mentioned upper limit, the meltability of the vinyl chloride resin composition for powder molding can be further improved, and the surface smoothness of the vinyl chloride resin molded article formed can be further improved.

[0031] [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 for powder molding 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 for powder molding can be further increased.

[0032] <(b) Sebacic acid polyester> The (b) sebacic acid polyester contained in the vinyl chloride resin composition for powder molding typically functions as a plasticizer. The (b) sebacic acid polyester is a polyester obtained by thin-film distillation, containing structural units derived from sebacic acid and structural units derived from 3-methyl-1,5-pentanediol, and having a terminal structure derived from 2-ethylhexanol. In the (b) sebacic acid polyester, the structural units derived from sebacic acid and the structural units derived from 3-methyl-1,5-pentanediol are typically linked alternately. Although (b) sebacic acid polyester may contain structural units other than those derived from sebacic acid and 3-methyl-1,5-pentanediol, the sum of the structural units derived from sebacic 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, (b) sebacic acid polyester preferably contains only structural units derived from sebacic acid and structural units derived from 3-methyl-1,5-pentanediol as repeating units. Since the composition of the present invention contains (b) sebacic acid polyester, vinyl chloride resin molded articles obtained using this composition have excellent alcohol resistance and low-temperature flexibility.

[0033] Here, the above-mentioned (b) sebacic acid polyester can be obtained by condensation polymerization of sebacic acid and 3-methyl-1,5-pentanediol, without any particular limitation. The above-mentioned condensation polymerization can be carried out in the presence of a catalyst. The above-mentioned condensation polymerization can also be carried out using 2-ethylhexanol as a terminal-terminating component. The product obtained by condensation polymerization is subjected to post-treatment by thin-film distillation, and may also be subjected to other post-treatments. Obtaining the above-mentioned (b) sebacic acid polyester by thin-film distillation improves fogging resistance. Known conditions can be used for the reaction conditions of condensation polymerization, such as the amounts of the monomers, catalyst, and terminal-terminating component used, and for the pressure and temperature of thin-film distillation. As the (b) sebacic acid polyester, commercially available products may be used.

[0034] The catalyst used in the condensation polymerization reaction is not particularly limited, and examples thereof include dibutyltin oxide and tetraalkyl titanate.

[0035] The (b) sebacic acid polyester 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. The (b) sebacic acid polyester preferably has an acid value of 1 or less. Furthermore, the sebacic acid polyester (b) preferably has a hydroxyl value of 30 or less.

[0036] Furthermore, the viscosity of the (b) sebacate polyester is preferably 500 mPa·s or more, more preferably 1000 mPa·s or more, and is preferably 10000 mPa·s or less, more preferably 8000 mPa·s or less. The "viscosity" can be measured at a temperature of 23°C in accordance with JIS Z8803.

[0037] The content of the (b) sebacic acid polyester is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, even more preferably 20 parts by mass or more, and preferably 200 parts by mass or less, more preferably 90 parts by mass or less, and even more preferably 80 parts by mass or less, per 100 parts by mass of the (a) vinyl chloride resin. When the content of the (b) sebacic acid polyester is equal to or greater than the lower limit, the alcohol resistance and low-temperature flexibility of the vinyl chloride resin molded article are improved. When the content of the (b) sebacic acid polyester is equal to or less than the upper limit, for example, by adding an additional component such as (c) an additional ester to the composition, the physical properties, such as powder flowability, of the vinyl chloride resin composition for powder molding can be improved.

[0038] <(c) Additional Ester> The (c) additional ester contained in the vinyl chloride resin composition for powder molding typically functions as a plasticizer. The (b) sebacic acid polyester improves the alcohol resistance and low-temperature flexibility of vinyl chloride resin molded articles, but is thought to reduce the powder fluidity of the vinyl chloride resin composition for powder molding. Therefore, it is preferable to use the (c) additional ester in combination to improve powder fluidity. The (c) additional ester is not particularly limited as long as it is an ester other than sebacic acid polyester, but examples include ester compounds of aromatic carboxylic acids and monohydric alcohols, and polyesters containing structural units derived from dicarboxylic acids other than sebacic acid and structural units derived from diols (hereinafter referred to as "additional polyesters").

[0039] Examples of the ester compound of an aromatic carboxylic acid and a monohydric alcohol include a trimellitic acid ester and a pyromellitic acid ester. The trimellitic acid ester or the pyromellitic acid ester is preferably an ester compound of trimellitic acid or pyromellitic acid with a monohydric alcohol.

[0040] Specific examples of the monohydric alcohol include, but are not limited to, aliphatic alcohols such as 1-hexanol, 1-heptanol, 1-octanol, 2-ethylhexanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, etc. Among these, the monohydric alcohol is preferably an aliphatic alcohol having 6 to 18 carbon atoms, and more preferably a linear aliphatic alcohol having 6 to 18 carbon atoms.

[0041] Among these, the trimellitic acid ester or pyromellitic acid ester is preferably a trimellitic acid triester or pyromellitic acid tetraester in which substantially all of the carboxy groups of trimellitic acid or pyromellitic acid are esterified with the above-mentioned monohydric alcohol. The alcohol residue portions in the trimellitic acid triester or pyromellitic acid tetraester may be derived from the same alcohol or different alcohols. The trimellitic acid ester or pyromellitic acid ester may consist of a single compound or may be a mixture of different compounds.

[0042] Examples of trimellitic acid esters or pyromellitic acid esters include trimethyl trimellitate, triethyl trimellitate, tri-n-propyl trimellitate, tri-n-butyl trimellitate, tri-n-pentyl trimellitate, tri-n-hexyl trimellitate, tri-n-heptyl trimellitate, tri-n-octyl trimellitate, tri-n-nonyl trimellitate, tri-n-decyl trimellitate, tri-n-undecyl trimellitate, tri-n-dodecyl trimellitate, tri-n-tridecyl trimellitate, and tri-n-methyl-2-methyl-1-propanol. Linear trimellitic acid esters in which the alkyl group constituting the ester is linear, such as tri-n-tetradecyl trimellitate, tri-n-pentadecyl trimellitate, tri-n-hexadecyl trimellitate, tri-n-heptadecyl trimellitate, tri-n-stearyl trimellitate, and tri-n-alkyl trimellitate (wherein the number of carbon atoms in the alkyl groups of the trimellitic acid tri-n-alkyl esters may be different from each other in one molecule) (note that these trimellitic acid esters may consist of a single compound or a mixture); Tri-i-propyl trimellitate, tri-i-butyl trimellitate, tri-i-pentyl trimellitate, tri-i-hexyl trimellitate, tri-i-heptyl trimellitate, tri-i-octyl trimellitate, tri-(2-ethylhexyl) trimellitate, tri-i-nonyl trimellitate, tri-i-decyl trimellitate, tri-i-undecyl trimellitate, tri-i-dodecyl trimellitate, tri-i-tridecyl trimellitate, tri-i-tetradecyl trimellitate, branched trimellitic acid esters in which the alkyl group constituting the ester is branched, such as tri-i-pentadecyl trimellitate, tri-i-hexadecyl trimellitate, tri-i-heptadecyl trimellitate, tri-i-octadecyl trimellitate, and trialkyl trimellitate (wherein the number of carbon atoms in the alkyl groups of the trialkyl trimellitate may be different from each other in one molecule); (Note that these trimellitic acid esters may consist of a single compound or may be a mixture.) Tetramethyl pyromellitate, tetraethyl pyromellitate, tetra-n-propyl pyromellitate, tetra-n-butyl pyromellitate, tetra-n-pentyl pyromellitate, tetra-n-hexyl pyromellitate, tetra-n-heptyl pyromellitate, tetra-n-octyl pyromellitate, tetra-n-nonyl pyromellitate, tetra-n-decyl pyromellitate, tetra-n-undecyl pyromellitate, tetra-n-dodecyl pyromellitate, tetra-n-tridecyl pyromellitate, tetra-n-tetradecyl pyromellitate, pyromellitate Linear pyromellitic acid esters in which the alkyl group constituting the ester is linear, such as tetra-n-pentadecyl romellitic acid, tetra-n-hexadecyl pyromellitic acid, tetra-n-heptadecyl pyromellitic acid, tetra-n-stearyl pyromellitic acid, and tetra-n-alkyl pyromellitic acid esters (wherein the number of carbon atoms in the alkyl groups of the pyromellitic acid tetra-n-alkyl esters may be different from each other in one molecule) (note that these pyromellitic acid esters may consist of a single compound or a mixture); Tetra-i-propyl pyromellitate, tetra-i-butyl pyromellitate, tetra-i-pentyl pyromellitate, tetra-i-hexyl pyromellitate, tetra-i-heptyl pyromellitate, tetra-i-octyl pyromellitate, tetra-(2-ethylhexyl) pyromellitate, tetra-i-nonyl pyromellitate, tetra-i-decyl pyromellitate, tetra-i-undecyl pyromellitate, tetra-i-dodecyl pyromellitate, tetra-i-tridecyl pyromellitate, Examples of suitable pyromellitic acid esters include branched pyromellitic acid esters in which the alkyl groups constituting the ester are branched, such as tetra-i-tetradecyl romellitic acid, tetra-i-heptadecyl pyromellitic acid, tetra-i-octadecyl pyromellitic acid, and tetraalkyl pyromellitic acid esters (wherein the number of carbon atoms in the alkyl groups of the pyromellitic acid tetraalkyl esters may be different from each other in one molecule). (Note that these pyromellitic acid esters may consist of a single compound or may be a mixture.)

[0043] Additional polyesters include, for example, polyesters containing structural units derived from dicarboxylic acids such as adipic acid, phthalic acid, etc., and structural units derived from the diols described above.

[0044] When the vinyl chloride resin composition for powder molding contains the (c) additional ester, the content of the (c) additional ester is preferably 1 part by mass or more, more preferably 5 parts by mass or more, most preferably 10 parts by mass or more, and preferably 200 parts by mass or less, more preferably 150 parts by mass or less, even more preferably 130 parts by mass or less, and most preferably 120 parts by mass or less, per 100 parts by mass of the (a) vinyl chloride resin. When the content of the (c) additional ester is equal to or greater than the lower limit, the powder flowability of the vinyl chloride resin composition for powder molding and the fogging resistance and low-temperature flexibility of the vinyl chloride resin molded article are improved. Furthermore, the (c) additional ester is well absorbed by the (a) vinyl chloride resin, improving the powder moldability of the vinyl chloride resin composition for powder molding. Furthermore, when the content of the (c) additional ester is equal to or less than the upper limit, the heat shrinkage resistance of the vinyl chloride resin molded article is improved.

[0045] Furthermore, the total content of the (b) sebacic acid polyester and the (c) additional ester is preferably 30 parts by mass or more, more preferably 50 parts by mass or more, and even more preferably 80 parts by mass or more, and preferably 200 parts by mass or less, more preferably 150 parts by mass or less, and even more preferably 130 parts by mass or less, per 100 parts by mass of vinyl chloride resin particles. When the total content of the (b) sebacic acid polyester and the (c) additional ester is equal to or greater than the above-mentioned lower limit, the powder flowability of the vinyl chloride resin composition for powder molding and the flexibility of vinyl chloride resin molded articles at low temperatures can be improved. When the total content of the (b) sebacic acid polyester and the (c) additional ester is equal to or less than the above-mentioned upper limit, the fogging resistance and heat shrinkage resistance can be sufficiently improved.

[0046] The content of (b) sebacic acid polyester relative to 100 parts by mass of the total plasticizers is preferably 5 parts by mass or more, more preferably 9 parts by mass or more, even more preferably 18 parts by mass or more, particularly preferably 40 parts by mass or more, and preferably 99 parts by mass or less, more preferably 90 parts by mass or less, and particularly preferably 80 parts by mass or less. Furthermore, when the vinyl chloride resin composition for powder molding contains the (c) additional ester, the content of (b) sebacic acid polyester relative to 100 parts by mass of the total plasticizers is preferably 80 parts by mass or less, more preferably 70 parts by mass or less, even more preferably 60 parts by mass or less, and particularly preferably 50 parts by mass or less. When the content of (b) sebacic acid polyester relative to the total plasticizer content is equal to or greater than the above-mentioned lower limit, the alcohol resistance and low-temperature flexibility of the vinyl chloride resin molded article can be sufficiently improved. When the content of (b) sebacic acid polyester relative to the total plasticizer content is equal to or less than the above-mentioned upper limit, the powder flowability of the vinyl chloride resin composition for powder molding can be sufficiently improved.

[0047] <Additives> The vinyl chloride resin composition for powder molding of the present invention may further contain various additives in addition to the components described above. The additives are not particularly limited, and examples thereof include components that can function as plasticizers other than the above-mentioned (b) sebacic acid polyester and (c) additional ester (e.g., epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil; chlorinated paraffin, butyl epoxy stearate, phenyl oleate, and methyl dihydroabietate); 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; blowing agents; and pigments.

[0048] The additives that may be contained in the vinyl chloride resin composition for powder molding 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.

[0049] <Shape and physical properties of vinyl chloride resin composition for powder molding> From the viewpoint of being suitable for use in powder molding (e.g., powder slush molding), the vinyl chloride resin composition for powder molding of the present invention is preferably in a particulate form, and more preferably in a smooth state with low moisture and viscosity. Such a state is indicated by the vinyl chloride resin composition for powder molding having physical property values ​​within a predetermined range that indicate powderiness. Such physical property values ​​include, for example, the falling time in seconds and bulk density.

[0050] <Method for preparing vinyl chloride resin composition for powder molding> The vinyl chloride resin composition for powder molding of the present invention can be prepared by mixing the above-mentioned components. The method for mixing the (a) vinyl chloride resin, (b) sebacic acid polyester, (c) additional ester (if necessary), and various additives (if necessary) is not particularly limited, but a mixing method that forms a particulate vinyl chloride resin composition for powder molding is preferred. Examples of such a mixing method include dry-blending all components except the dusting agent (including the vinyl chloride resin fine particles contained in the (a) vinyl chloride resin), allowing the mixture to dry up (the vinyl chloride resin particles contained in the (a) vinyl chloride resin absorb the plasticizer, resulting in a smooth mixture), and then adding and mixing the dusting agent. Dry-blending can be performed, for example, using a powder mixer (e.g., a high-performance fluidized mixer such as a Henschel mixer). The temperature during dry blending is not particularly limited, but is preferably 50°C or higher, more preferably 70°C or higher, to promote absorption of other components by the vinyl chloride resin particles, and 200°C or lower, to prevent denaturation and decomposition of the components of the mixture.

[0051] <Applications of vinyl chloride resin compositions for powder molding> The obtained vinyl chloride resin composition for powder molding can be used for powder molding, and can be suitably used for powder slush molding.

[0052] (Vinyl chloride resin molded body) The vinyl chloride resin molded article of the present invention is characterized in that it is obtained by powder molding the above-mentioned vinyl chloride resin composition for powder molding by any powder molding method (e.g., powder slush molding method). Since the vinyl chloride resin molded article of the present invention is formed using the above-mentioned vinyl chloride resin composition for powder molding, it usually contains at least (a) vinyl chloride resin and (b) sebacic acid polyester, and is excellent in alcohol resistance and low-temperature flexibility. Therefore, the vinyl chloride resin molded article of the present invention is suitable for use in producing the skins of automobile interior parts such as automobile instrument panels and door trims, which have excellent alcohol resistance and low-temperature flexibility.

[0053] <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.

[0054] The vinyl chloride resin molded article can be produced by any method, including, but not limited to, the following. Specifically, the vinyl chloride resin composition for powder molding 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 for powder molding is then shaken off, and the mold is then left standing at any desired 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 demolded from the mold. A sheet-like molded article conforming to the shape of the mold is then obtained.

[0055] (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. The laminate of the present invention has, for example, a vinyl chloride resin molded article formed using the vinyl chloride resin composition for powder molding of the present invention, and therefore has excellent alcohol resistance and low-temperature flexibility. Therefore, the laminate of the present invention is suitably used, for example, as an automobile interior material for forming automobile interior parts such as automobile instrument panels and door trims.

[0056] 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]

[0057] 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 powder properties (falling seconds, bulk density) of the vinyl chloride resin composition for powder molding, the low-temperature tensile elongation (initial, after heating (heat aging test), after immersion in alcohol) of the vinyl chloride resin molded product, and the peak-top temperature of the loss modulus (initial, after heating (heat aging test), after immersion in alcohol) were measured and evaluated by the methods described below.

[0058] <Measuring method for powder properties (fall time, bulk density)> The vinyl chloride resin compositions obtained in each Example and Comparative Example were poured into a 100 cc stainless steel cylinder whose weight had been measured in advance from the funnel of a powder property tester ("TESTERTYPE 6721" manufactured by Nippon Oil Testing Instruments Co., Ltd.) until the vinyl chloride resin composition overflowed, and the cylinder was filled to the top with a smooth rod. The weight of the cylinder after filling was measured, and the weight of the powder contained was calculated by subtracting the weight of the cylinder, and the calculated weight was divided by 100 to obtain the bulk density (g / cm 3) was calculated. Thereafter, the vinyl chloride resin composition filled in the cylinder was poured back into the funnel, and after the entire amount had been poured, the lower retaining plate was removed to allow the composition to fall onto a flat plate. The time it took for all of the vinyl chloride resin composition to finish falling was recorded as the number of seconds to fall. A shorter number of seconds to fall indicates that the vinyl chloride resin composition has better powder fluidity.

[0059] <Low temperature tensile elongation> [initial] 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 (%) was measured at a low temperature of -10°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 tensile elongation at low temperatures of the initial (unheated) vinyl chloride resin molded body.

[0060] [After heating (thermal aging test)] A laminate backed with a polyurethane foam molded body was used as a sample. The sample was placed in an oven and heated for 500 hours in an environment at a temperature of 120°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 (%) of the vinyl chloride resin molded sheet after 500 hours of heating was measured. A larger value of tensile elongation at break indicates better tensile elongation of the vinyl chloride resin molded body after heating (thermal aging test) and better aging resistance.

[0061] <Alcohol resistance test (low-temperature tensile elongation after immersion in alcohol)> The resulting vinyl chloride resin molded sheet was trimmed to 130 mm x 120 mm. It was placed in a 140 mm x 180 mm x 30 mm container containing 300 mL of ethanol, and the container was then capped. The vinyl chloride resin molded sheet was immersed at room temperature for three days and then removed. The vinyl chloride resin molded sheet was air-dried at room temperature for one day to prepare a sample. The vinyl chloride resin molded sheet was then punched out with a No. 1 dumbbell and subjected to a tensile test at -10°C. The larger the tensile elongation at break, the better the tensile elongation at low temperatures of the vinyl chloride resin molded body after alcohol immersion, indicating excellent alcohol resistance.

[0062] <Measurement of the peak top temperature of loss modulus and evaluation of its fluctuation> [initial] The flexibility of the vinyl chloride resin molded article was evaluated as an index by measuring the peak-top temperature of the loss modulus (E") in a dynamic viscoelasticity test (DMA). Specifically, a measurement sample was prepared by punching out the obtained vinyl chloride resin molded sheet into a size of 10 mm wide x 40 mm long. Then, in accordance with JIS K7244-4, the peak-top temperature (°C) of the loss modulus (E") for the measurement sample was measured at a frequency of 10 Hz, a heating rate of 2°C / min, and a measurement temperature range of -90°C to +100°C. The lower the peak-top temperature of the vinyl chloride resin molded sheet, the better its flexibility at low temperatures.

[0063] [After heating (thermal aging test)] A measurement sample prepared in the same manner as in the initial case above was placed in an oven and heated for 500 hours in an environment at a temperature of 120°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 above, the peak top temperature (°C) of the loss modulus (E") of the measurement sample of the vinyl chloride resin molded sheet after 500 hours of heating was measured, and the degree of variation from the peak top temperature (°C) of the loss modulus (E") of the measurement sample in the initial state was calculated. The smaller the degree of variation, the better the aging resistance of the vinyl chloride resin molded sheet.

[0064] [After soaking in alcohol] A measurement sample prepared in the same manner as in the initial case above was placed in a 140 mm x 180 mm x 30 mm container containing 300 mL of ethanol, and the container was then capped. The vinyl chloride resin molded sheet was immersed for 3 days at room temperature and then removed. The vinyl chloride resin molded sheet was air-dried at room temperature for one day to prepare a sample. The peak top temperature (°C) of the loss modulus (E") of the measurement sample was then measured, and the degree of variation from the peak top temperature (°C) of the loss modulus (E") of the measurement sample in its initial state was calculated. The smaller the degree of variation, the better the alcohol resistance of the vinyl chloride resin molded sheet.

[0065] (Production example of polyester plasticizer) The polyester plasticizers (polyesters of dicarboxylic acids and diols) used in the examples and comparative examples were prepared as follows. Adipic acid or sebacic acid as the dicarboxylic acid, 3-methyl-1,5-pentanediol as the diol, and 2-ethylhexanol as the stopper (terminal termination component) were charged into a reaction vessel, tetraisopropyl titanate as a catalyst was added, and a solvent was added as appropriate. The mixture was heated with stirring. The by-product water was removed under normal and reduced pressure to complete the dehydration condensation reaction. The resulting products were subjected to thin-film distillation to obtain polyester plasticizers A and B, each terminated with 2-ethylhexoxy groups. The results are shown in Table 1.

[0066] [Table 1]

[0067] Example 1 <Preparation of vinyl chloride resin composition for powder molding> Of the ingredients shown in Table 2, all ingredients except for the plasticizers (trimellitic acid ester, polyester plasticizer B, and epoxidized soybean oil (ESBO)) and the vinyl chloride resin fine particles serving as a dusting agent were placed in a Henschel mixer and mixed. Then, when the temperature of the mixture rose to 80°C, all of the plasticizer was added, and the mixture was allowed to dry up (referring to the state in which the plasticizer is absorbed into the vinyl chloride resin particles serving as the vinyl chloride resin, and the mixture becomes smooth). Then, when the dried-up mixture was cooled to a temperature of 70°C or below, the vinyl chloride resin fine particles serving as a dusting agent were added, and a vinyl chloride resin composition was prepared.

[0068] <Creating a resin molded sheet for evaluation> The obtained vinyl chloride resin composition 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 measuring 145 mm x 175 mm x 1 mm was removed from the mold as a vinyl chloride resin molded product.

[0069] <Surface / Polyurethane (PU) laminate> One of the obtained vinyl chloride resin molded sheets 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, terminal EO unit content = 10%, internal EO unit content = 4%), 50 parts of a glycerin PO·EO block adduct (hydroxyl value 21, 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"). The resulting polyol mixture was then mixed with polymethylene polyphenylene polyisocyanate (polymeric MDI) at a ratio of 98 to prepare a mixture. The mixture was then poured onto a vinyl chloride resin molding sheet placed in a mold. Thereafter, the mold was covered with an aluminum plate measuring 348 mm × 255 mm × 10 mm, and the mold was sealed. After sealing the mold, the mold was left for 5 minutes, and a polyurethane foam molded body (thickness: 9 mm, density: 0.2 g / cm) was formed on a vinyl chloride resin molded sheet (thickness: 1 mm) as a skin. 3 ) backed laminate was formed in a mold.

[0070] Example 2 A vinyl chloride resin composition for powder molding, a vinyl chloride resin molded sheet, and a laminate were prepared in the same manner as in Example 1, except that the amounts of polyester plasticizer B and trimellitate ester used were changed as shown in Table 2 (trimellitate ester was not included). Measurements and evaluations were then carried out in the same manner as in Example 1. The results are shown in Table 2.

[0071] (Comparative Example 1) A vinyl chloride resin composition for powder molding, a vinyl chloride resin molded sheet, and a laminate were prepared in the same manner as in Example 1, except that the amounts of polyester plasticizer B and trimellitic ester used were changed as shown in Table 2 (polyester plasticizer B was not included). Measurements and evaluations were then carried out in the same manner as in Example 1. The results are shown in Table 2.

[0072] (Comparative Examples 2 and 3) In each of Comparative Examples 2 and 3, a vinyl chloride resin composition for powder molding, a vinyl chloride resin molded sheet, and a laminate were prepared in the same manner as in Examples 1 and 2, respectively, except that polyester plasticizer A was used instead of polyester plasticizer B, as shown in Table 2. Measurements and evaluations were then carried out in the same manner as in Example 1. The results are shown in Table 2.

[0073] [Table 2]

[0074] The ingredients indicated by the product names in the table are as follows: <Vinyl chloride resin particles> ZEST (registered trademark) 1700ZI (manufacturer: Shin-Daiichi Vinyl Corporation): polyvinyl chloride resin (suspension polymerization, average particle size: 129 μm, degree of polymerization: 1700) ZEST (registered trademark) 1300SI (manufacturer: Shin-Daiichi Vinyl Corporation): polyvinyl chloride resin (suspension polymerization, average particle size: 132 μm, degree of polymerization: 1300) <Vinyl chloride resin fine particles (dusting agent)> ZEST PQLTX (Manufacturer: Shin-Daiichi Vinyl Corporation): Polyvinyl chloride resin (emulsion polymerization, average particle size: 1.8 μm, degree of polymerization: 800) <Plasticizer> Trimex N-08 (Manufacturer: Kao Corporation): Trimellitate plasticizer (n-C8, C10 trimellitic acid ester) Adeka Cizer O-130S (Manufacturer: ADEKA Corporation): Epoxidized soybean oil (ESBO) <Stabilizer> Alkamiser (registered trademark) 5 (manufacturer: Kyowa Chemical Industry Co., Ltd.): Perchloric acid partially introduced hydrotalcite (90% ClO4HDT) MIZUKALIZER DS (Manufacturer: Mizusawa Industrial Chemicals Co., Ltd.): Na-zeolite Karenz DK-1 (manufacturer: Showa Denko K.K.): β-diketone ADK STAB LA-72 (Manufacturer: ADEKA Corporation): Hindered amine light stabilizer (HALS) SAKAI SZ2000 (Manufacturer: Sakai Chemical Industry Co., Ltd.): Zinc stearate <Release agent> ADK STAB LS-12 (Manufacturer: ADEKA Corporation): 12-hydroxystearic acid <Pigments> DA PX 1720(A) Black (Manufacturer: Dainichi Seika Chemicals Co., Ltd.): Colorant

[0075] Table 2 shows that vinyl chloride resin molded articles using polyester plasticizer B (sebacic acid polyester) as a plasticizer (Examples 1 and 2) have higher tensile elongation after 3 days of alcohol immersion and after 500 hours of heating than vinyl chloride resin molded articles not containing polyester plasticizer B (Comparative Example 1) and vinyl chloride resin molded articles using polyester plasticizer A (adipic acid polyester) as a plasticizer (Comparative Examples 2 and 3). This shows that vinyl chloride resin molded articles using sebacic acid polyester as a plasticizer have better alcohol resistance than vinyl chloride resin molded articles using adipic acid polyester as a plasticizer. Furthermore, in Examples 1 and 2, a peak top temperature with a low loss modulus (E") was obtained, demonstrating that vinyl chloride resin molded articles using sebacic acid polyester as a plasticizer have excellent low-temperature flexibility. Furthermore, in Examples 1 and 2, the change in the peak top temperature of the loss modulus (E") after immersion in alcohol for 3 days and after heating for 500 hours was small, indicating that vinyl chloride resin molded articles using sebacic acid polyester as a plasticizer have excellent low-temperature flexibility.

[0076] Example 3 Vinyl chloride resin compositions for powder molding, vinyl chloride resin molded sheets, and laminates were prepared in the same manner as in Example 1, except that the amounts of polyester plasticizer B and trimellitic acid ester used, and the types of vinyl chloride resin particles were changed as shown in Table 3. Measurements and evaluations were then carried out in the same manner as in Example 1. The results are shown in Table 3.

[0077] Comparative Example 4 As shown in Table 3, a vinyl chloride resin composition for powder molding, a vinyl chloride resin molded sheet, and a laminate were prepared in the same manner as in Example 3, except that polyester plasticizer A was used instead of polyester plasticizer B. Measurements and evaluations were then carried out in the same manner as in Example 1. The results are shown in Table 3.

[0078] [Table 3]

[0079] In Table 3, the total amount of plasticizer and the type of vinyl chloride resin particles are different from those in Table 2, but even in this case, the vinyl chloride resin molded product (Example 3) using polyester plasticizer B (sebacic acid polyester) as the plasticizer showed higher tensile elongation after 3 days of alcohol immersion and after 500 hours of heating than the vinyl chloride resin molded product (Comparative Example 4) using polyester plasticizer A (adipic acid polyester) as the plasticizer. This shows that regardless of the total amount of plasticizer or the type of vinyl chloride resin particles, the vinyl chloride resin molded product using sebacic acid polyester as the plasticizer has superior alcohol resistance compared to the vinyl chloride resin molded product using adipic acid polyester as the plasticizer. Furthermore, in Example 3, a low peak top temperature of the loss modulus (E") was obtained, which indicated that vinyl chloride resin molded articles using sebacic acid polyester as a plasticizer have excellent low-temperature flexibility, regardless of the total amount of plasticizer or the type of vinyl chloride resin particles. Furthermore, in Example 3, there was little change in the peak top temperature of the loss modulus (E") after immersion in alcohol for 3 days and after heating for 500 hours, which indicated that vinyl chloride resin molded articles using sebacic acid polyester as a plasticizer have excellent low-temperature flexibility, regardless of the total amount of plasticizer or the type of vinyl chloride resin particles.

[0080] Examples 4 and 5 A vinyl chloride resin composition for powder molding, a vinyl chloride resin molded sheet, and a laminate were prepared in the same manner as in Example 1, except that the amounts of polyester plasticizer B and trimellitic ester used were changed as shown in Table 4. Measurements and evaluations were then carried out in the same manner as in Example 1. The results are shown in Table 4 together with those of Examples 1 and 2 and Comparative Example 1.

[0081] [Table 4]

[0082] A comparison of Examples 1, 2, 4, and 5 with Comparative Example 1 in Table 4 shows that the higher the content of sebacic acid polyester, the more suppressed the degree of decrease in low-temperature tensile elongation after 3 days of alcohol immersion and after 500 hours of heating, relative to the initial low-temperature tensile elongation. This indicates that the higher the content of sebacic acid polyester, the better the low-temperature tensile elongation is maintained after 3 days of alcohol immersion and after 500 hours of heating, improving alcohol resistance and low-temperature flexibility. Furthermore, the number of seconds required for the composition (powder) to fall increased as the content of trimellitate plasticizer increased, indicating that increasing the content of ester components other than sebacic acid polyester improves the powder flowability of the composition. [Industrial Applicability]

[0083] According to the vinyl chloride resin composition for powder molding of the present invention, it is possible to form a vinyl chloride resin molded article having excellent alcohol resistance and low-temperature flexibility. Furthermore, according to the present invention, it is possible to provide a vinyl chloride resin molded article and laminate that are excellent in alcohol resistance and low-temperature flexibility.

Claims

1. (a) a vinyl chloride resin; (b) a sebacic acid polyester obtained by thin-film distillation, which comprises structural units derived from sebacic acid, structural units derived from 3-methyl-1,5-pentanediol, and a terminal structure derived from 2-ethylhexanol; A method for producing a vinyl chloride resin composition for powder molding, comprising the following steps: A step of thin-film distilling a sebacic acid polyester comprising structural units derived from sebacic acid, structural units derived from 3-methyl-1,5-pentanediol, and a terminal structure derived from 2-ethylhexanol; and A step of mixing (a) vinyl chloride resin with (b) thin-film distilled sebacic acid polyester to obtain a vinyl chloride resin composition for powder molding. Including, (a) The vinyl chloride resin contains vinyl chloride resin particles having a particle diameter of 30 μm or more and vinyl chloride resin fine particles having a particle diameter of less than 30 μm. A method for producing a vinyl chloride resin composition for powder molding.

2. The manufacturing method described in claim 1, wherein the vinyl chloride resin composition for powder molding contains (a) 100 parts by mass of vinyl chloride resin and (b) 5 parts by mass or more and 200 parts by mass or less of sebacic acid polyester.

3. A manufacturing method described in claim 1 or 2, wherein the polyvinyl chloride resin composition for powder molding further contains (c) an additional ester other than sebacate polyester.

4. A manufacturing method described in any one of claims 1 to 3, wherein the vinyl chloride resin composition for powder molding contains (b) sebacic acid polyester in an amount of 5 parts by mass or more and 99 parts by mass or less per 100 parts by mass of total plasticizers.

5. A process for obtaining a vinyl chloride resin composition for powder molding by mixing (a) vinyl chloride resin and (b) thin-film distilled sebacic acid polyester, a step of mixing the vinyl chloride resin particles and the thin-film distilled sebacic acid polyester (b) by dry blending, and drying up the mixture; and A step of mixing the dried mixture with the vinyl chloride resin fine particles to obtain a vinyl chloride resin composition for powder molding. The method according to any one of claims 1 to 3, comprising:

6. A step of obtaining a vinyl chloride resin composition for powder molding by the production method according to any one of claims 1 to 5; and a step of powder slush molding the vinyl chloride resin composition for powder molding to obtain a vinyl chloride resin molded article; A method for producing a vinyl chloride resin molded article, comprising:

7. The manufacturing method described in Claim 6, wherein the polyvinyl chloride resin molded body is for an automobile instrument panel.

8. A step of obtaining a vinyl chloride resin molded article by the production method according to claim 6; and A step of laminating the vinyl chloride resin molded body and foamed polyurethane to obtain a laminate. A method for producing a laminate, comprising:

9. The manufacturing method described in claim 8, wherein the laminate is for an automobile instrument panel.

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