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

Abstract

The objective of the present invention is to provide a vinyl chloride resin composition capable of improving the releasability of a vinyl chloride resin molded body. The vinyl chloride resin composition according to the present invention is characterized by comprising (a) vinyl chloride resin particles, (b) vinyl chloride resin fine particles having a tetrahydrofuran-insoluble content ratio of 70% or more, and (c) a plasticizer. The vinyl chloride resin composition is preferably used in powder molding.

Description

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

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

[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, automotive interior parts such as automotive instrument panels and door trims are formed using automotive interior materials such as skins made of vinyl chloride resin molded articles and laminates made of vinyl chloride resin molded articles backed with foam such as polyurethane foam. Vinyl chloride resin molded articles constituting the skins of automotive interior parts such as automotive instrument panels are produced, for example, by molding vinyl chloride resin compositions containing vinyl chloride resin, a plasticizer, and additives such as pigments using known molding methods such as powder slush molding (see, for example, Patent Document 1, etc.).

[0003] Specifically, in Patent Document 1, a vinyl chloride resin molded article is produced by powder molding a vinyl chloride resin composition that contains a vinyl chloride resin and a plasticizer, and in which (1) the proportion of tetrahydrofuran insoluble matter is 10 mass% or more and / or (2) the ratio of the proportion of tetrahydrofuran insoluble matter to the content proportion of the plasticizer is 0.20 or more.

[0004] International Publication No. 2022 / 209872

[0005]

[0003] Here, when a vinyl chloride resin composition is powder-molded using a mold, for example, the obtained vinyl chloride resin molded article may be difficult to peel from the mold (i.e., demolded). Therefore, from the viewpoint of improving the production efficiency of vinyl chloride resin molded articles, it is desired that the vinyl chloride resin composition have improved demoldability of the obtained vinyl chloride resin molded article. However, the vinyl chloride resin compositions of the above-mentioned prior art have room for improvement in terms of improving the demoldability of vinyl chloride resin molded articles.

[0006] Therefore, an object of the present invention is to provide a vinyl chloride resin composition that can improve the demoldability of a vinyl chloride resin molded article. Another object of the present invention is to provide a vinyl chloride resin molded article that has excellent demoldability. A further object of the present invention is to provide a laminate including the vinyl chloride resin molded article.

[0007] The present inventors have conducted extensive research to solve the above-mentioned problems, and have newly discovered that by blending vinyl chloride resin fine particles having a tetrahydrofuran-insoluble content of a predetermined value or more with a vinyl chloride resin composition, the demoldability of the resulting vinyl chloride resin molded article can be improved, leading to the completion of the present invention.

[0008] That is, the present invention aims to advantageously solve the above-mentioned problems, and the present invention is [1] a vinyl chloride resin composition comprising (a) vinyl chloride resin particles, (b) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of 70% or more, and (c) a plasticizer. If the vinyl chloride resin composition contains vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of the above-mentioned predetermined value or more, the demoldability of the obtained vinyl chloride resin molded article can be improved. In the present invention, the tetrahydrofuran-insoluble content of the vinyl chloride resin microparticles can be measured by the method described in the Examples.

[0009] [2] In the vinyl chloride resin composition of the above [1], the vinyl chloride resin fine particles (b) preferably have a tetrahydrofuran-insoluble content of 90% or less. If the tetrahydrofuran-insoluble content of the vinyl chloride resin fine particles is equal to or less than the above-mentioned predetermined value, the demoldability of the obtained vinyl chloride resin molded article can be further improved.

[0010] [3] In the vinyl chloride resin composition of [1] or [2] above, the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is preferably 0.1% by mass or more and 30% by mass or less relative to the total of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more. If the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is equal to or greater than the lower limit, the demoldability of the resulting vinyl chloride resin molded article can be further improved. Furthermore, if the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is equal to or less than the upper limit, the physical strength of the resulting vinyl chloride resin molded article can be sufficiently ensured.

[0011] [4] In the vinyl chloride resin composition according to any one of [1] to [3] above, the plasticizer (c) preferably contains at least one of a trimellitate ester and a polyester. When the plasticizer contains at least one of a trimellitate ester and a polyester, the flexibility of the resulting vinyl chloride resin molded article can be well maintained.

[0012] [5] In the vinyl chloride resin composition according to any one of [1] to [4] above, the content of the (c) plasticizer is preferably 30 parts by mass or more and 200 parts by mass or less per 100 parts by mass of the total of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of 70% or more. When the content of the (c) plasticizer in the vinyl chloride resin composition is equal to or greater than the lower limit, the flexibility of the resulting vinyl chloride resin molded article can be improved. On the other hand, when the content of the (c) plasticizer in the vinyl chloride resin composition is equal to or less than the upper limit, the powder flowability of the vinyl chloride resin composition can be improved.

[0013] [6] The vinyl chloride resin composition according to any one of [1] to [5] above is preferably used for powder molding. By using the vinyl chloride resin composition for powder molding, it is possible to easily obtain a vinyl chloride resin molded article that can be favorably used as an automotive interior material, such as a skin for an automotive instrument panel.

[0014] [7] The vinyl chloride resin composition according to any one of [1] to [6] above 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 automotive interior material, such as a skin for an automotive instrument panel.

[0015] Another object of the present invention is to advantageously solve the above-mentioned problems, and the present invention provides [8] a vinyl chloride resin molded article obtained by molding the vinyl chloride resin composition according to any one of [1] to [7] above. By molding the vinyl chloride resin composition, a vinyl chloride resin molded article with excellent demoldability can be easily obtained.

[0016] [9] The vinyl chloride resin molded article according to [8] above is preferably used for the surface of an automobile instrument panel. The vinyl chloride resin molded article can be suitably used as the surface of an automobile instrument panel.

[0017] Another object of the present invention is to advantageously solve the above-mentioned problems, and the present invention relates to a laminate comprising

[10] a polyurethane foam molded product and the vinyl chloride resin molded product of [8] or [9] above. By using the vinyl chloride resin molded product, a laminate comprising a polyurethane foam molded product and a vinyl chloride resin molded product can be easily obtained.

[0018]

[11] The laminate of

[10] above is preferably an automobile instrument panel. The laminate can be suitably used as an automobile instrument panel.

[0019] According to the present invention, it is possible to provide a vinyl chloride resin composition that can improve the demoldability of a vinyl chloride resin molded article. Also, according to the present invention, it is possible to provide a vinyl chloride resin molded article that has excellent demoldability. Furthermore, according to the present invention, it is possible to provide a laminate including the vinyl chloride resin molded article.

[0020]

[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 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.

[0021] (Vinyl chloride resin composition) The vinyl chloride resin composition of the present invention comprises (a) vinyl chloride resin particles, (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and (c) a plasticizer, and may optionally further comprise (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% and / or an additive. Since the vinyl chloride resin composition of the present invention comprises (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, the demoldability of the resulting vinyl chloride resin molded article can be improved.

[0022] <Vinyl chloride resin> Here, as the vinyl chloride resin that can be composed of (a) vinyl chloride resin particles, (b) vinyl chloride resin microparticles that the proportion of tetrahydrofuran insoluble matter is 70% or more, and (d) vinyl chloride resin microparticles that the proportion of tetrahydrofuran insoluble matter is less than 70%, besides vinyl chloride homopolymer, the vinyl chloride copolymer that contains vinyl chloride unit is preferably 50% by mass or more, more preferably 70% by mass or more can be enumerated.The comonomer of vinyl chloride copolymer is not particularly limited, and for example, can use the one described in International Publication No. 2016 / 098344 alone or two or more can be combined in any ratio.

[0023] The vinyl chloride resin can be produced by any conventionally known production method, such as suspension polymerization, emulsion polymerization, solution polymerization, or bulk polymerization.

[0024] In the vinyl chloride resin composition of the present invention, (a) vinyl chloride resin particles usually function as a matrix resin, and (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more and (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% function as dusting agents (powder flow improvers) described below. (a) vinyl chloride resin particles are preferably produced by suspension polymerization, and (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more and (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% are preferably produced by emulsion polymerization. In the present invention, "resin particles" refers to particles having a particle diameter of 30 μm or more, and "resin microparticles" refers to particles having a particle diameter of less than 30 μm.

[0025] <Vinyl Chloride Resin Particles> The volume average particle diameter of the (a) vinyl chloride resin particles is typically 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 volume average particle diameter of the (a) vinyl chloride resin particles is equal to or greater than the above-mentioned lower limit, the powder flowability of the vinyl chloride resin composition can be further improved. Furthermore, if the volume average particle diameter of the (a) vinyl chloride resin particles is equal to or less than the above-mentioned upper limit, the meltability of the vinyl chloride resin composition can be improved, and the surface smoothness of a vinyl chloride resin molded article formed using the composition can be improved. The volume average particle diameter of the vinyl chloride resin particles can be measured by laser diffraction in accordance with JIS Z8825, for example, using a "SALD-2300" manufactured by Shimadzu Corporation.

[0026] Furthermore, the average degree of polymerization of the vinyl chloride resin constituting the (a) vinyl chloride resin particles is preferably 1,000 or more, more preferably 1,300 or more, and preferably 5,000 or less, more preferably 4,000 or less, and even more preferably 3,500 or less. When the average degree of polymerization of the vinyl chloride resin constituting the (a) vinyl chloride resin particles is within the above range, 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 excellent 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 (a) vinyl chloride resin particles is equal to or less than the above upper limit, the meltability of the vinyl chloride resin composition can be improved. In the present invention, the average degree of polymerization of the vinyl chloride resin is measured in accordance with JIS K6720-2.

[0027] <(b) Vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more> Vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more function as a dusting agent (powder flowability improver) that improves the powder flowability of a vinyl chloride resin composition, and are a component that is distinguished from the above-mentioned (a) vinyl chloride resin particles.

[0028] From the viewpoint of further improving the demoldability of vinyl chloride resin molded articles, (b) the proportion of tetrahydrofuran insoluble matter in the vinyl chloride resin constituting the vinyl chloride resin microparticles having a proportion of tetrahydrofuran insoluble matter of 70% or more is preferably 80% or more, more preferably 85% or more, and is preferably 95% or less, more preferably 90% or less.

[0029] In the present invention, the proportion of tetrahydrofuran-insoluble matter in the vinyl chloride resin microparticles can be adjusted, for example, by adjusting the crosslinking degree of the vinyl chloride resin constituting the vinyl chloride resin microparticles.Here, the crosslinking method of the vinyl chloride resin is not particularly limited, and for example, the above-mentioned vinyl chloride resin may be chemically crosslinked using a known crosslinking agent, or may be crosslinked by irradiation with radiation such as electron beams.In addition, the crosslinking degree can be appropriately adjusted, for example, by adjusting the type and / or amount of the crosslinking agent used, or the type and / or amount of radiation used.

[0030] [Volume Average Particle Diameter] The volume average particle diameter of (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is typically 30 μm or less, 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 volume average particle diameter of (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is equal to or greater than the lower limit described above, the powder fluidity of the vinyl chloride resin composition can be further improved, for example, without excessively reducing the size of the dusting agent. Furthermore, if the volume average particle diameter of (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is equal to or less than the upper limit described above, the meltability of the vinyl chloride resin composition can be enhanced, and the surface smoothness of the vinyl chloride resin molded article formed can be improved. In the present invention, the average particle diameter of the vinyl chloride resin microparticles is measured by laser diffraction in accordance with JIS Z8825, for example, using a "SALD-2300" manufactured by Shimadzu Corporation.

[0031] <(d) Vinyl chloride resin fine particles having a tetrahydrofuran insoluble content of less than 70%> The vinyl chloride resin composition of the present invention may further contain (d) vinyl chloride resin fine particles having a tetrahydrofuran insoluble content of less than 70%. (d) Vinyl chloride resin fine particles having a tetrahydrofuran insoluble content of less than 70% function as a dusting agent that improves the powder fluidity of the vinyl chloride resin composition, and are distinguished from the (a) vinyl chloride resin particles and the (b) vinyl chloride resin fine particles having a tetrahydrofuran insoluble content of 70% or more.

[0032] (d) The proportion of tetrahydrofuran insoluble matter in the vinyl chloride resin microparticles having a tetrahydrofuran insoluble matter ratio of less than 70% is preferably 50% or less, more preferably 40% or less, even more preferably 20% or less, and particularly preferably 0%.

[0033] [Average Degree of Polymerization] The average degree of polymerization of the vinyl chloride resin constituting the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% 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 (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% as a dusting agent is equal to or greater than the above-mentioned lower limit, the powder fluidity of the vinyl chloride resin composition can be further improved, and the tensile elongation at low temperatures (e.g., −10°C) of molded articles obtained using the composition can be improved. Furthermore, when the average degree of polymerization of the vinyl chloride resin constituting the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% is equal to or less than the above-mentioned upper limit, the meltability of the vinyl chloride resin composition can be improved, and the surface smoothness of vinyl chloride resin molded articles formed using the composition can be improved.

[0034] [Volume average particle diameter] The preferred volume average particle diameter of (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% is not particularly limited and can be the same as that of (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more.

[0035] <Content of vinyl chloride resin particles and vinyl chloride resin microparticles> Here, when the vinyl chloride resin composition of the present invention does not contain (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%, the content of the (a) vinyl chloride resin particles is preferably 70% by mass or more, more preferably 75% by mass or more, and even more preferably 80% by mass or more, relative to the total (100% by mass) of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more. It is also preferably 99.9% by mass or less, more preferably 98% by mass or less, and even more preferably 95% by mass or less. If the content of the (a) vinyl chloride resin particles is equal to or greater than the lower limit, the physical strength of the resulting vinyl chloride resin molded article can be sufficiently ensured. If the content of the (a) vinyl chloride resin particles is equal to or less than the upper limit, the powder flowability of the vinyl chloride resin composition can be improved.

[0036] Furthermore, when the vinyl chloride resin composition of the present invention does not contain the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%, the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is preferably 0.1% by mass or more, more preferably 2% by mass or more, and even more preferably 5% by mass or more, relative to the total (100% by mass) of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more. It is also preferable that the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less. If the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is above the lower limit, the demoldability of the vinyl chloride resin molded article can be further improved. If the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is below the upper limit, the physical strength of the resulting vinyl chloride resin molded article can be sufficiently ensured.

[0037] On the other hand, when the vinyl chloride resin composition of the present invention contains the vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% (d), the content of the vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% (d) is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 4% by mass or more, and is preferably 15% by mass or less, more preferably 13% by mass or less, and even more preferably 10% by mass or less, relative to the total (100% by mass) of the vinyl chloride resin particles, the vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more (b), and the vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% (d). If the content of the vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% (d) is equal to or greater than the lower limit, the flowability of the vinyl chloride resin composition can be improved. When the content of the (d) vinyl chloride resin fine particles having a tetrahydrofuran insoluble content of less than 70% is equal to or less than the upper limit, the physical strength of the vinyl chloride resin molded article obtained can be sufficiently ensured.

[0038] Furthermore, when the vinyl chloride resin composition of the present invention contains (d) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of less than 70%, the content of the (a) vinyl chloride resin particles is preferably 70% by mass or more, more preferably 75% by mass or more, and even more preferably 80% by mass or more, relative to the total (100% by mass) of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of 70% or more. It is also preferable that the content of the (a) vinyl chloride resin particles is 99.9% by mass or less, more preferably 98% by mass or less, and even more preferably 95% by mass or less. If the content of the (a) vinyl chloride resin particles is equal to or greater than the lower limit, the physical strength of the resulting vinyl chloride resin molded article can be sufficiently ensured. If the content of the (a) vinyl chloride resin particles is equal to or less than the upper limit, the powder flowability of the vinyl chloride resin composition can be improved.

[0039] Furthermore, when the vinyl chloride resin composition of the present invention contains (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%, the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is preferably 0.1% by mass or more, more preferably 2% by mass or more, and even more preferably 5% by mass or more, relative to the total (100% by mass) of the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%. If the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is equal to or greater than the lower limit, the demoldability of the vinyl chloride resin molded article can be further improved. When the content of the (b) vinyl chloride resin fine particles having a tetrahydrofuran insoluble content of 70% or more is equal to or less than the upper limit, the physical strength of the vinyl chloride resin molded article obtained can be sufficiently ensured.

[0040] <(c) Plasticizer> The vinyl chloride resin composition of the present invention contains (c) a plasticizer. By containing (c) a plasticizer in the vinyl chloride resin composition, the vinyl chloride resin molded article formed can exhibit sufficient flexibility, and can be suitably used, for example, as an automobile interior material.

[0041] Here, the content of the (c) plasticizer in the vinyl chloride resin composition is preferably 30 parts by mass or more, more preferably 85 parts by mass or more, and preferably 200 parts by mass or less, more preferably 120 parts by mass or less, relative to 100 parts by mass of the total of the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of 70% or more, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of less than 70%, which are added as needed. If the content of the (c) plasticizer in the vinyl chloride resin composition is equal to or greater than the lower limit, the flexibility of the vinyl chloride resin molded article formed can be increased. On the other hand, if the content of the (c) plasticizer in the vinyl chloride resin composition is equal to or less than the upper limit, the powder flowability of the vinyl chloride resin composition can be improved.

[0042] The (c) plasticizer contained in the vinyl chloride resin composition of the present invention is not particularly limited, but it is preferable to use, for example, at least one of (c1) polyester and (c2) trimellitic acid ester. Note that, as the (c) plasticizer, plasticizers other than (c1) polyester and (c2) trimellitic acid ester (hereinafter, sometimes referred to as "(c3) other plasticizers") may also be used.

[0043] <<(c1) Polyester>> The (c) plasticizer preferably contains the (c1) polyester. If the (c) plasticizer contains the (c1) polyester, the heat shrinkage resistance of the resulting vinyl chloride resin molded article can be improved.

[0044] The (c1) polyester that can be contained in the (c) 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. From the viewpoint of further enhancing the heat shrinkage resistance of the resulting vinyl chloride resin molded article, it is preferable to use a polyester containing structural units derived from adipic acid as the (c1) polyester, 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.

[0045] Hereinafter, for convenience of explanation, a 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." Here, polyester A containing the above-mentioned specified structural units may have structural units other than structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol, but the total of structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol is preferably 50% by mass or more, and more preferably 80% by mass or more, of all structural units. Furthermore, polyester A containing the above-mentioned specified structural units preferably has only structural units derived from adipic acid and structural units derived from 3-methyl-1,5-pentanediol as repeating units.

[0046] The polyester A containing the above-described 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 condition. The polyester A containing the above-described predetermined structural unit may be a commercially available product.

[0047] The catalyst used in the condensation polymerization reaction is not particularly limited, and examples thereof include dibutyltin oxide and tetraalkyl titanate.

[0048] 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. Furthermore, examples of monobasic acids that can be used as end-stopping components include acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, pivalic acid, caproic acid, heptanoic acid, caprylic acid, 2-ethylhexylic 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.

[0049] The polyester A containing the predetermined structural unit 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 determined as a polystyrene-equivalent value by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent. The polyester A containing the predetermined structural unit preferably has an acid value of 1 or less. Furthermore, the polyester A containing the predetermined structural unit preferably has a hydroxyl value of 30 or less.

[0050] Furthermore, the viscosity of the polyester A containing the above-mentioned predetermined structural unit is preferably 500 mPa·s or more, more preferably 1000 mPa·s or more, and is preferably 8000 mPa·s or less, more preferably 5000 mPa·s or less. The "viscosity" can be measured in accordance with JIS Z8803 at a temperature of 23°C.

[0051] The content of the (c1) polyester in the (c) plasticizer is preferably 50% by mass or more, more preferably 55% by mass or more, and even more preferably 60% by mass or more, and is preferably 97% by mass or less, and more preferably 96% by mass or less. If the content of the (c1) polyester in the (c) plasticizer is equal to or greater than the above-mentioned lower limit, the heat shrinkage resistance of the vinyl chloride resin molded article formed can be further improved. On the other hand, if the content of the (c1) polyester in the (c) plasticizer is equal to or less than the above-mentioned upper limit, the flexibility of the vinyl chloride resin molded article formed at low temperatures can be well maintained.

[0052] The content of the (c1) polyester in the vinyl chloride resin composition is preferably 30 parts by mass or more, more preferably 40 parts by mass or more, even more preferably 50 parts by mass or more, and even more preferably 60 parts by mass or more, and preferably 120 parts by mass or less, and more preferably 110 parts by mass or less, relative to 100 parts by mass of the total of the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of 70% or more, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of less than 70%, which are added as needed. If the content of the (c1) polyester in the vinyl chloride resin composition is equal to or greater than the lower limit, the heat shrinkage resistance of the vinyl chloride resin molded article formed can be further improved. On the other hand, if the content of the (c1) polyester in the vinyl chloride resin composition is equal to or less than the upper limit, the powder flowability of the vinyl chloride resin composition can be improved.

[0053] <<(c2) Trimellitic Acid Ester>> The (c) plasticizer preferably contains a (c2) trimellitic acid ester. When the (c) plasticizer contains a (c2) trimellitic acid ester, the (c2) trimellitic acid ester is well absorbed into the vinyl chloride resin ((a) vinyl chloride resin particles, (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and optionally added (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%), thereby improving the powder fluidity of the vinyl chloride resin composition. Furthermore, when the (c) plasticizer contains a (c2) trimellitic acid ester, the flexibility of the resulting vinyl chloride resin molded article at low temperatures can be improved.

[0054] The trimellitic acid ester (c2) contained in the plasticizer (c) is preferably an ester compound of trimellitic acid and a monohydric alcohol.

[0055] 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.

[0056] Among these, the trimellitic acid ester (c2) is preferably a triester product in which substantially all of the carboxy groups of trimellitic acid are esterified with the monohydric alcohol. The alcohol residue portions in the triester product may be derived from the same alcohol or from different alcohols. The trimellitic acid ester (c2) may be composed of a single compound or a mixture of different compounds.

[0057] Specific examples of suitable trimellitic acid esters (c2) include tri-n-hexyl trimellitate, tri-n-heptyl trimellitate, tri-n-octyl trimellitate, tri-(2-ethylhexyl) trimellitate, tri-n-nonyl trimellitate, tri-n-decyl trimellitate, triisodecyl trimellitate, tri-n-undecyl trimellitate, tri-n-dodecyl trimellitate, trialkyl trimellitate esters (esters having two or more alkyl groups with different carbon numbers [with the carbon number being 6 to 18] in the molecule), tri-n-alkyl trimellitate esters (esters having two or more alkyl groups with different carbon numbers [with the carbon number being 6 to 18] in the molecule), and mixtures thereof. More preferred specific examples of (c2) trimellitic acid esters include tri-n-octyl trimellitate, tri-(2-ethylhexyl) trimellitate, tri-n-nonyl trimellitate, tri-n-decyl trimellitate, tri-n-alkyl trimellitate (esters having two or more alkyl groups with different carbon numbers [however, the number of carbon atoms is 6 to 18] in the molecule), and mixtures thereof.

[0058] The content of the (c2) trimellitic ester in the (c) plasticizer is preferably 5% by mass or more, more preferably 10% by mass or more, more preferably 97% by mass or less, and even more preferably 96% by mass or less. When the content of the (c2) trimellitic ester in the (c) plasticizer is equal to or greater than the above-mentioned lower limit, the powder fluidity of the vinyl chloride resin composition can be further increased, and the flexibility of the vinyl chloride resin molded article at low temperatures can be further increased. On the other hand, when the content of the (c2) trimellitic ester in the (c) plasticizer is equal to or less than the above-mentioned upper limit, the heat shrinkage resistance of the vinyl chloride resin molded article can be increased.

[0059] The content of (c2) trimellitic acid ester in the vinyl chloride resin composition is preferably 5 parts by mass or more, preferably 80 parts by mass or less, more preferably 60 parts by mass or less, and even more preferably 50 parts by mass or less, relative to 100 parts by mass of the total of the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of 70% or more, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran-insoluble content of less than 70%, which are added as needed. If the content of (c2) trimellitic acid ester in the vinyl chloride resin composition is equal to or greater than the above-mentioned lower limit, the powder fluidity of the vinyl chloride resin composition can be further improved, and the flexibility of the vinyl chloride resin molded article at low temperatures can be further improved. On the other hand, if the content of (c2) trimellitic acid ester in the vinyl chloride resin composition is equal to or less than the above-mentioned upper limit, the heat shrinkage resistance of the vinyl chloride resin molded article can be improved.

[0060] <<(c3) Other Plasticizers>> The (c) plasticizer contained in the vinyl chloride resin composition may optionally include (c3) other plasticizers other than the above-described (c1) polyesters and (c2) trimellitic esters.

[0061] Specific examples of the (c3) other plasticizer include plasticizers other than the (c1) polyesters and (c2) trimellitic acid esters described above among the plasticizers described in WO 2016 / 098344. Among these, it is preferable to use epoxidized soybean oil from the viewpoint of further increasing the flexibility of the resulting vinyl chloride resin molded article at low temperatures.

[0062] The content of the (c3) other plasticizer in the (c) plasticizer is not particularly limited, but is preferably from 0% by mass to 15% by mass. If the content of the (c3) other plasticizer in the (c) plasticizer is within the above range, the flexibility of the resulting vinyl chloride resin molded article at low temperatures after heating can be improved.

[0063] In addition, the content of the (c3) other plasticizer in the vinyl chloride resin composition is not particularly limited, but can be 0 to 15 parts by mass per 100 parts by mass of the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% added as needed. In addition, from the viewpoint of further improving the flexibility of the vinyl chloride resin molded body at low temperatures, it is preferable to use epoxidized vegetable oil such as epoxidized soybean oil as the (c3) other plasticizer in an amount of 2 to 7 parts by mass per 100 parts by mass of the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70% added as needed.

[0064] <Additives> The vinyl chloride resin composition of the present invention may contain various additives in addition to the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, the (c) plasticizer, and the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%. The additives are not particularly limited, and for example, those described in WO 2016 / 098344 can be used, and the preferred blending amount thereof can also be the same as that described in WO 2016 / 098344.

[0065] <Properties> [Particle size] The particle size (median size) of the vinyl chloride resin composition is preferably 100 μm or more, more preferably 140 μm or more, and preferably 400 μm or less, more preferably 380 μm or less. If the particle size of the vinyl chloride resin composition is within the above range, the vinyl chloride resin composition can be suitably used for powder molding, and can be suitably used for powder slush molding. In the present invention, the particle size of the vinyl chloride resin composition can be measured by the method described in the examples.

[0066] [Fall Time in Seconds at Room Temperature] The fall time in seconds of the vinyl chloride resin composition at room temperature is preferably 20 seconds or less, more preferably 15 seconds or less. When the fall time in seconds of the vinyl chloride resin composition at room temperature is the above-mentioned upper limit or less, the vinyl chloride resin composition has excellent powder flowability at room temperature, and therefore the vinyl chloride resin composition can be suitably used for powder molding, and can be suitably used for powder slush molding. In the present invention, the fall time in seconds of the vinyl chloride resin composition at room temperature can be measured by the method described in the Examples.

[0067] [Fall Time in Seconds at High Temperatures] The fall time in seconds of the vinyl chloride resin composition at high temperatures (30°C to 60°C) is preferably 50 seconds or less, more preferably 30 seconds or less, and even more preferably 20 seconds or less. When the fall time in seconds of the vinyl chloride resin composition at high temperatures is equal to or less than the above upper limit, the vinyl chloride resin composition has excellent high-temperature powder fluidity, and therefore can be suitably used for powder molding at high temperatures, and can be more suitably used for powder slush molding at high temperatures. In the present invention, the fall time in seconds of the vinyl chloride resin composition at high temperatures can be measured by the method described in the Examples.

[0068] <Method for Preparing Vinyl Chloride Resin Composition> The vinyl chloride resin composition of the present invention can be obtained by mixing the above-mentioned components. The method for mixing the (a) vinyl chloride resin particles, the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, the (c) plasticizer, and the (d) vinyl chloride resin microparticles and / or additives added as needed, having a tetrahydrofuran insoluble content of less than 70%, is not limited. A preferred mixing method is to dry-blend all components except the plasticizer and dusting agent (including the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more and the (d) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of less than 70%), and then sequentially add the plasticizer and dusting agent. A Henschel mixer is preferably used for dry-blending. The temperature during dry-blending is preferably 50°C or higher and 100°C or lower, more preferably 70°C or higher and 80°C or lower.

[0069] (Vinyl chloride resin molded article) The vinyl chloride resin molded article of the present invention can be obtained by powder molding, preferably powder slush molding, of the vinyl chloride resin composition of the present invention described above. When forming a vinyl chloride resin molded article 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 preferably 300°C or lower, and more preferably 280°C or lower. The vinyl chloride resin molded article can be produced by any method, but is not particularly limited thereto. For example, the following method can be used. That is, the vinyl chloride resin composition is sprinkled onto a mold at the above temperature range, and the mold is left for 5 to 30 seconds, after which the excess vinyl chloride resin composition is shaken off. The mold is then left for 30 to 3 minutes at any temperature. The mold is then cooled to 10 to 60°C, and the resulting vinyl chloride resin molded article is demolded from the mold. A sheet-like molded article conforming to the shape of the mold is obtained.

[0070] The vinyl chloride resin molded article of the present invention is obtained by molding the vinyl chloride resin composition of the present invention described above, and therefore has excellent demoldability, particularly when the mold temperature is high (e.g., 270°C or higher).

[0071] <Dynamic friction coefficient> The dynamic friction coefficient of the vinyl chloride resin molded article of the present invention is preferably 0.70 or less, more preferably 0.60 or less. If the dynamic friction coefficient of the vinyl chloride resin molded article is the above upper limit value or less, it indicates that the stickiness of the surface of the vinyl chloride resin molded article is suppressed. In the present invention, the dynamic friction coefficient of the vinyl chloride resin molded article can be measured by the method described in the Examples.

[0072] <Uses> The vinyl chloride resin molded article of the present invention is suitably used as an automobile interior material, for example, the surface of an instrument panel, door trim, or the like.

[0073] (Laminate) The laminate of the present invention comprises a polyurethane foam molded body and the vinyl chloride resin molded body described above. The vinyl chloride resin molded body typically constitutes one surface of the laminate. The method for laminating the polyurethane foam molded body and the 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 polyurethane is foamed by a known method, thereby directly forming a polyurethane foam molded body on the vinyl chloride resin molded body; and the like. 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.

[0074] <Uses> The laminate of the present invention is suitably used as an automobile interior material, for example, an instrument panel, a door trim, and the like.

[0075] The present invention will be described in detail 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. In the examples and comparative examples, the physical properties of vinyl chloride resin microparticles, vinyl chloride resin compositions, and vinyl chloride resin molded articles were measured or evaluated by the following methods.

[0076] <Proportion of tetrahydrofuran insoluble content of vinyl chloride resin microparticles> Using an ADVANTEC filter thimble No. 86R, Soxhlet extraction was performed using tetrahydrofuran as the extraction solvent, and the proportion of tetrahydrofuran insoluble content of vinyl chloride resin microparticles was determined. Specifically, the weight of the filter thimble was measured, and the initial filter weight W1 was used. Next, approximately 0.5 g of vinyl chloride resin microparticles was placed in the cylinder of the filter thimble, and Soxhlet extraction was performed using tetrahydrofuran for 3 hours. Thereafter, the filter thimble containing the sample was transferred to a beaker, placed in a vacuum dryer set at 50 ° C, and heated under reduced pressure for 3 hours. Next, the weight W2 of the filter thimble containing the sample was measured. Then, the proportion of tetrahydrofuran insoluble content of vinyl chloride resin microparticles was determined using the following formula: Percentage of tetrahydrofuran insoluble content (%) = (weight W2 (g) of the filter thimble containing the sample - initial weight W1 (g) of the filter thimble) / weight (g) of the sample × 100 <Particle diameter of vinyl chloride resin composition> For the vinyl chloride resin compositions obtained in the examples and comparative examples, the vinyl chloride resin compositions were sieved using a sieve set consisting of sieves stacked from top to bottom with openings of 355 μm, 250 μm, 180 μm, 150 μm, 125 μm, 106 μm, and 75 μm, respectively, and an ultrasonic automatic sieving measuring device (Robot Sifter RPS-105, manufactured by Seishin Enterprise Co., Ltd.), and the median size was determined in accordance with JIS Z 8815. <Powder flowability at room temperature> Using the vinyl chloride resin compositions obtained in the examples and comparative examples, the bulk density was measured from the weight of the particles placed in a 100 mL container using a bulk specific gravity measuring device described in JIS-K-6720. The resulting vinyl chloride resin composition powder in a 100 mL container was returned to the bulk specific gravity measuring device, and the time from immediately opening the damper until all the powder had flowed was measured to obtain the falling time. If the powder had not completely flowed after waiting for one minute, it was recorded as "not flowing." All of the above operations were performed at room temperature (23°C). A shorter falling time indicates that the vinyl chloride resin composition has better powder fluidity at room temperature (room-temperature powder fluidity). <High-Temperature Powder Fluidity> The powder fluidity at high temperatures of the vinyl chloride resin compositions obtained in the Examples and Comparative Examples was evaluated using a bulk specific gravity measuring device according to JIS-K-6720.Specifically, the vinyl chloride resin compositions obtained in the Examples and Comparative Examples were placed in a tray and heated in an oven at 80°C for 2 hours. After heating, the vinyl chloride resin compositions were removed from the oven and allowed to air-cool at room temperature while stirring with a medicine spoon. The temperature of the vinyl chloride resin composition was measured, and when it reached a predetermined temperature (60°C, 50°C, 40°C, or 30°C), an appropriate amount was removed and the bulk density was measured based on the weight of the powder in a 100 ml container using the method described in JIS-K-6720. The powder in the 100 ml container obtained at this time was returned to the bulk specific gravity measuring device, and the time from immediately opening the damper until all the powder flowed was measured to obtain the falling time. Note that if the powder did not flow completely after waiting 1 minute, it was considered not to have flowed. The temperatures measured were 60°C, 50°C, 40°C, and 30°C in that order, without reheating. A shorter falling time indicates that the vinyl chloride resin composition has better powder fluidity at high temperatures (high-temperature powder fluidity). <Dynamic Friction Coefficient> The dynamic friction coefficients of the vinyl chloride resin molded articles obtained in the Examples and Comparative Examples were measured as follows. The vinyl chloride resin molded articles were left to stand for one day after production in a measurement environment of 23°C and 50% relative humidity. Using a texture tester (manufactured by Trinity Labs, product name "TL201Ts"), the dynamic friction coefficient of the sheet surface was measured by contacting a tactile contactor with the vinyl chloride resin molded article (vinyl chloride resin molded sheet) under the following conditions: load: 50 g, speed: 10 mm / sec, test range: 50 mm, and measurement range: 30 mm excluding 10 mm before and after the test range. The above measurement was repeated four more times, and the average of the second, third, and fourth measurement values ​​was obtained. Four different measurement locations were selected on the surface of the same molded article, and the same measurement was performed. The average value of the average dynamic friction values ​​obtained in these four locations was further averaged to determine the dynamic friction coefficient of the molded article. The smaller the value of the dynamic friction coefficient, the more suppressed the stickiness of the surface of the vinyl chloride resin molded article. <Mold demolding force> The vinyl chloride resin compositions obtained in the examples and comparative examples were sprinkled onto a textured mold heated to a temperature of 250°C or 270°C, and left to melt for an arbitrary time so that the thickness of the molded article (vinyl chloride resin molded article) would be 1 mm, 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 at 200°C, and after 60 seconds of standing, the textured mold was cooled with cooling water. When the mold temperature had cooled to 40°C, the molded product was peeled from the mold, leaving only a 70 mm wide x 120 mm long section, to form a demolding force measurement section. The end of the demolding force measurement section was gripped with a chuck and peeled at 180° to the mold at a speed of 600 mm / min. The peeling force was measured using an IMADA load cell, and the demolding force was recorded sequentially. The demolding force over the central 100 mm of the 120 mm length, excluding the first 10 mm and the last 10 mm, was averaged to determine the mold demolding force (N). This procedure was repeated two more times, and the average of the three measured values ​​was calculated. The smaller the mold demolding force (N), the better the demoldability of the vinyl chloride resin molded product. <Tensile Test> Measurement samples were prepared by punching out the vinyl chloride resin molded articles (sheets) produced in the Examples and Comparative Examples with a No. 1 dumbbell punch as specified in JIS K6251. The measurement samples were then measured for breaking elongation (%) at a low temperature of -10°C at a pulling rate of 200 mm / min in accordance with JIS K7113. A larger breaking elongation value indicates that the vinyl chloride resin molded article has better tensile elongation at low temperatures (low-temperature tensile elongation).

[0077] Examples 1-1 to 1-5 and Comparative Example 1 Of the ingredients shown in Table 1, all but the plasticizer (adipic acid polyester and epoxidized soybean oil) and dusting agent (vinyl chloride resin fine particles) were mixed in a Henschel mixer. 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 by the vinyl chloride resin particles and the mixture becomes smooth). When the dried-up mixture was cooled to 70°C or below, a dusting agent was added to prepare a vinyl chloride resin composition. Various physical properties of the resulting vinyl chloride resin composition were measured and evaluated. The results are shown in Table 2. The resulting vinyl chloride resin composition was then sprinkled onto a textured mold heated to 250°C and allowed to stand for a time (specifically, 14 to 17 seconds) adjusted to produce a vinyl chloride resin molded sheet with a thickness of 1 mm, allowing it to melt. After this, excess vinyl chloride resin composition was shaken off. The mold was then placed in an oven set to 200°C, and after 60 seconds, the 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. Various physical properties of the obtained vinyl chloride resin molded sheet were measured. The results are shown in Table 2.

[0078] Examples 2-1 to 2-2 and Comparative Example 2 Of the ingredients shown in Table 1, all but the plasticizer (trimellitic acid ester and epoxidized soybean oil) and dusting agent (vinyl chloride resin fine particles) were mixed in a Henschel mixer. 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 and the mixture becomes smooth). When the dried mixture was cooled to 70°C or below, a dusting agent was added to prepare a vinyl chloride resin composition. Various physical properties of the resulting vinyl chloride resin composition were measured and evaluated. The results are shown in Table 3. The resulting vinyl chloride resin composition was then sprinkled onto a textured mold heated to 250°C and left to melt for a time (specifically, 14 to 17 seconds) adjusted to produce a vinyl chloride resin molded sheet with a thickness of 1 mm. After this, excess vinyl chloride resin composition was shaken off. The mold was then placed in an oven set to 200°C, and after 60 seconds, the 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. Various physical properties of the obtained vinyl chloride resin molded sheet were measured. The results are shown in Table 3. 1) Shin-Dai-Ichi Vinyl Corporation, product name "ZEST (registered trademark) 1300SI" ((a) vinyl chloride resin particles, prepared by suspension polymerization, average degree of polymerization: 1300, average particle size: 132 μm) 2) Shin-Dai-Ichi Vinyl Corporation, product name "ZEST (registered trademark) 1000Z" ((a) vinyl chloride resin particles, prepared by suspension polymerization, average degree of polymerization: 1000, average particle size: 141 μm) 3) ADEKA Corporation, product name "ADEKA Cizer HPN-3130" 4) Kao Corporation, product name "Trimex T-08A" 5) ADEKA Corporation, product name "ADEKA Cizer O-130S" 6) Kyowa Chemical Industry Co., Ltd., product name "Alkamizer (registered trademark) 5" 7) Mizusawa Industrial Chemicals, Ltd., product name "MIZUKALIZER DS" 8) Showa Denko K.K., product name "Karenz DK-1" 9) Sakai Chemical Industry Co., Ltd., product name "SAKAI SZ2000" 10) ADEKA Corporation, product name "ADK STAB LS-12" 11) Mitsubishi Chemical Corporation, product name "Slipax O" (melting point: 119°C) 12) Shin-Dai-Ichi Vinyl Corporation, product name "ZEST PQLTX" ((d) polyvinyl chloride resin fine particles having a tetrahydrofuran insoluble content of less than 70%, prepared by emulsion polymerization, tetrahydrofuran insoluble content: 0%, average degree of polymerization: 800, average particle size: 1.8 μm) 13) Tosoh Corporation, product name "Ryuron Paste" C38" ((b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, prepared by emulsion polymerization, tetrahydrofuran insoluble content: 80%, average particle size: 2.0 μm) 14) Tosoh Corporation, product name "Ryuron Paste C70" ((b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, prepared by emulsion polymerization, tetrahydrofuran insoluble content: 86%, average particle size: 2.4 μm) 15) Dainichiseika Color & Chemicals Co., Ltd., product name "DA P 4720 Black"

[0079] The results shown in Table 2 show that the vinyl chloride resin compositions of Examples 1-1 to 1-5, which contain (a) vinyl chloride resin particles, (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and (c) polyester adipic acid as a plasticizer, can give vinyl chloride resin molded articles with excellent demoldability, particularly when the mold temperature is as high as 270°C, compared to the vinyl chloride resin composition of Comparative Example 1, which contains (a) vinyl chloride resin particles and (c) polyester adipic acid as a plasticizer and does not contain (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more. Furthermore, the results shown in Table 3 show that the vinyl chloride resin compositions of Examples 2-1 and 2-2, which contain (a) vinyl chloride resin particles, (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more, and (c) a trimellitic acid ester as a plasticizer, can produce vinyl chloride resin molded articles with excellent demoldability, even when the mold temperature is 250°C or 270°C, compared to the vinyl chloride resin composition of Comparative Example 2, which contains (a) vinyl chloride resin particles and (c) a trimellitic acid ester as a plasticizer and does not contain (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more.

[0080] According to the present invention, it is possible to provide a vinyl chloride resin composition that can improve the demoldability of a vinyl chloride resin molded article. Also, according to the present invention, it is possible to provide a vinyl chloride resin molded article that has excellent demoldability. Furthermore, according to the present invention, it is possible to provide a laminate including the vinyl chloride resin molded article.

Claims

1. A vinyl chloride resin composition comprising: (a) vinyl chloride resin particles; (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more; and (c) a plasticizer.

2. The vinyl chloride resin composition according to claim 1, wherein the vinyl chloride resin fine particles (b) have a tetrahydrofuran insoluble content of 90% or less.

3. The vinyl chloride resin composition according to claim 1, wherein the content of the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more is 0.1% by mass or more and 30% by mass or less of the total of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more.

4. The vinyl chloride resin composition according to claim 1, wherein the plasticizer (c) comprises at least one of a trimellitic acid ester and a polyester.

5. The vinyl chloride resin composition according to claim 1, wherein the content of the (c) plasticizer is 30 parts by mass or more and 200 parts by mass or less per 100 parts by mass of the total of the (a) vinyl chloride resin particles and the (b) vinyl chloride resin microparticles having a tetrahydrofuran insoluble content of 70% or more.

6. The vinyl chloride resin composition according to claim 1, which is used for powder molding.

7. The vinyl chloride resin composition according to claim 1, which is used in powder slush molding.

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

9. The vinyl chloride resin molded article according to claim 8, which is used for the surface of an automobile instrument panel.

10. A laminate comprising a polyurethane foam molded article and the vinyl chloride resin molded article according to claim 8.

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

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