Thermoplastic resin composition and molded article obtained from the resin composition

Abstract

To provide a thermoplastic resin composition which is excellent in silent characteristics and hydrolysis resistance, and a molding.SOLUTION: A thermoplastic resin composition contains a thermoplastic resin (X) and a resin composition (Y), wherein the thermoplastic resin (X) is a polycarbonate resin, or a mixed resin of a polycarbonate resin and a resin containing a rubbery polymer, a vinyl cyanide-based monomer and an aromatic vinyl-based monomer as constitutional units, the resin composition (Y) contains an ethylene- (meth) acrylic acid alkyl ester copolymer (L), a graft copolymer (M), a styrenic elastomer (N) and a modified polyolefin wax (O), the graft copolymer (M) is a specific graft copolymer, and a mass ratio of the ethylene- (meth) acrylic acid alkyl ester copolymer (A) and the monomer component (B) is 50 / 50 to 98 / 2.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a thermoplastic resin composition and a thermoplastic resin molded article. [Background technology]

[0002] Thermoplastic resins have excellent impact resistance, processability, dimensional stability, and mechanical properties, and are therefore used in a wide range of fields, including electrical and electronic housings, automotive interior and exterior parts, building materials, furniture, musical instruments, and miscellaneous goods. Furthermore, extrusion molded products (molded bodies) of thermoplastic resins are widely used as various display devices and protective parts for automotive interiors by undergoing additional secondary processing such as coating, lamination, and surface modification.

[0003] Among thermoplastic resins, polycarbonate (PC) resin and polycarbonate mixed resins (hereinafter referred to as PC / ABS (acrylonitrile-butadiene-styrene) resin and PC / ASA (acrylonitrile-styrene-acrylate) resin) have excellent impact resistance, processability, flame retardancy, and heat resistance, and are used as materials for automobile parts, precision machinery, office equipment, etc.

[0004] For example, when used in automotive parts such as armrests and seats, noise reduction properties (squeak suppression effect) are required, such as reducing (suppressing) the squeaking noise that occurs when resin comes into contact with leather (artificial leather (soft polyvinyl chloride) or natural leather, etc.).

[0005] As a method for improving the noise reduction properties of a thermoplastic resin composition, Patent Document 1 discloses a thermoplastic resin composition containing an ethylene-acrylic acid alkyl ester copolymer, an ethylene-acrylic acid alkyl ester copolymer, a (meth)acrylic acid alkyl ester copolymer, a graft copolymer made of an aromatic vinyl monomer, and a styrene-based elastomer.

[0006] Furthermore, polycarbonate resins and polycarbonate mixed resins are prone to hydrolysis, and when these resins are made into parts, they quickly deteriorate, which is a problem. As a method for improving the hydrolysis resistance of thermoplastic resins, Patent Document 2 discloses a thermoplastic resin composition containing a thermoplastic resin and polylactic acid. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2020 / 162494 [Patent Document 2] International Publication No. 2006 / 077721 Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above circumstances, an object of the present invention is to provide a thermoplastic resin composition having excellent noise reduction properties and hydrolysis resistance, and a molded article thereof. [Means for solving the problem]

[0009] That is, the present invention provides a thermoplastic resin composition containing a thermoplastic resin (X) and a resin composition (Y), wherein the thermoplastic resin (X) is a polycarbonate resin or a mixed resin of a polycarbonate resin, a rubber polymer, a vinyl cyanide monomer, and an aromatic vinyl monomer as structural units, and the resin composition (Y) contains an ethylene-(meth)acrylic acid alkyl ester copolymer (L), a graft copolymer (M), a styrene-based elastomer (N), and a modified polyolefin wax (O), The graft copolymer (M) is a graft copolymer obtained by reacting an ethylene-(meth)acrylic acid alkyl ester copolymer (A) with a monomer component (B) containing one or more monomers selected from the group consisting of a (meth)acrylic acid alkyl ester copolymer (b-1) and an aromatic vinyl monomer (b-2), and the thermoplastic resin composition has a mass ratio ((A) / (B)) of the ethylene-(meth)acrylic acid alkyl ester copolymer (A) to the monomer component (B) of 50 / 50 to 98 / 2.

[0010] Furthermore, the present invention relates to a thermoplastic resin molded article obtained from the thermoplastic resin composition. [Effects of the Invention]

[0011] Although the details of the mechanism of action of the effects of the thermoplastic resin composition of the present invention are partially unclear, it is presumed as follows: However, the present invention does not need to be interpreted as being limited to this mechanism of action.

[0012] The thermoplastic resin composition of the present invention contains a thermoplastic resin (X) and a resin composition (Y), and the resin composition (Y) contains a specific amount of an ethylene-(meth)acrylic acid alkyl ester copolymer (L), a specific graft copolymer (M), a styrene-based elastomer (N), and a modified polyolefin wax (O). The graft copolymer (M) improves the compatibility of the ethylene-(meth)acrylic acid alkyl ester (L), the styrene-based elastomer (N), and the thermoplastic resin, thereby allowing the ethylene-(meth)acrylic acid alkyl ester (L) and the styrene-based elastomer (N) to be well dispersed throughout the thermoplastic resin. Furthermore, the graft copolymer (M) contains polar groups, making it slightly compatible with the modified polyolefin wax (O), improving the compatibility between the thermoplastic resin and the modified polyolefin wax (O). Meanwhile, the highly polar modified polyolefin wax (O) is efficiently oriented near the surface of the thermoplastic resin. The modified polyolefin wax (O) is oriented near the surface of the thermoplastic resin, improving the slipperiness of the resin surface and improving noise reduction properties, while also suppressing the penetration of moisture into the thermoplastic resin, improving hydrolysis resistance. DETAILED DESCRIPTION OF THE INVENTION

[0013] <Thermoplastic resin composition> The thermoplastic resin composition of the present invention contains a thermoplastic resin (X) and a resin composition (Y).

[0014] <Thermoplastic resin (X)> The thermoplastic resin (X) is a polycarbonate (PC) resin or a mixed resin of a polycarbonate resin and a resin having a rubber polymer, a vinyl cyanide monomer, and an aromatic vinyl monomer as structural units.

[0015] The PC resin is not limited to a specific type. Examples of the PC resin include aromatic PC resins produced by the known phosgene method or melting method. Specific production methods are described in, for example, Japanese Patent Application Laid-Open Nos. 63-215763 and 2-124934. A typical diphenol used as a raw material is 2,2-bis(4-hydroxyphenyl)propane (also known as bisphenol A). Precursors for introducing carbonate include phosgene and diphenyl carbonate. The produced PC resin can be either one with or without capped terminal OH groups. Commercially available PC resins include, for example, "Toughlon A2200" (standard grade) manufactured by Idemitsu Kosan Co., Ltd.

[0016] The resin having the rubber polymer, the vinyl cyanide monomer, and the aromatic vinyl monomer as constituent units can be obtained, for example, by graft polymerizing, in the presence of the rubber polymer, a monomer component containing the vinyl cyanide monomer, the aromatic vinyl monomer, and, if necessary, any other copolymerizable monomer. Examples of the polymerization method include known methods such as bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization.

[0017] Examples of the rubbery polymer include diene rubber, acrylic rubber, and ethylene-propylene rubber. Examples of the diene rubber include polybutadiene rubber, acrylonitrile-butadiene copolymer rubber, styrene-butadiene copolymer rubber, and polyisoprene rubber. Examples of the acrylic rubber include acrylic rubbers having α,β-unsaturated carboxylic acids such as acrylic acid and methacrylic acid as structural units; and acrylic rubbers having α,β-unsaturated carboxylic acid esters such as methyl methacrylate, ethyl methacrylate, t-butyl methacrylate, and cyclohexyl methacrylate as structural units. Examples of the ethylene-propylene rubber include EPR and EPDM. The rubbery polymers may be used alone or in combination of two or more.

[0018] Examples of the vinyl cyanide monomer include acrylonitrile and methacrylonitrile, and among these, acrylonitrile is preferred. The vinyl cyanide monomer may be used alone or in combination of two or more kinds.

[0019] Examples of the aromatic vinyl monomer include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, pt-butylstyrene, etc. Among these, styrene and α-methylstyrene are preferred. The aromatic vinyl monomers may be used alone or in combination of two or more.

[0020] Examples of the other copolymerizable monomer include α,β-unsaturated carboxylic acids such as acrylic acid and methacrylic acid, α,β-unsaturated carboxylic acid esters such as methyl methacrylate, ethyl methacrylate, t-butyl methacrylate, and cyclohexyl methacrylate, and imide compounds of α,β-unsaturated dicarboxylic acids such as maleic anhydride and itaconic anhydride. The other copolymerizable monomers may be used alone or in combination of two or more.

[0021] Examples of the resin having a rubber polymer, a vinyl cyanide monomer, and an aromatic vinyl monomer as constituent units include ABS resin, ASA resin, and AES resin.

[0022] Examples of the ABS resin include acrylonitrile-butadiene-styrene copolymer, acrylonitrile-butadiene-styrene-α-methylstyrene copolymer, acrylonitrile-butadiene-styrene-N-phenylmaleimide copolymer, etc. Commercially available products include "Toyolac 700-314" manufactured by Toray Industries, Inc.

[0023] When the thermoplastic resin (X) is a mixed resin of a rubber polymer, a resin having structural units of a vinyl cyanide monomer and an aromatic vinyl monomer, and a PC resin, the content of the PC resin is preferably 50 to 95 mass %, thereby obtaining a thermoplastic resin composition with particularly excellent noise reduction properties.

[0024] As for the mixed resin of PC resin and ABS resin (PC / ABS resin), examples of commercially available products include "Bayblend T65XF" manufactured by Covstro.

[0025] <Resin composition (Y)> The resin composition (Y) of the present invention contains an ethylene-(meth)acrylic acid alkyl ester copolymer (L), a graft copolymer (M), a styrene-based elastomer (N), and a modified polyethylene wax (O).

[0026] <Ethylene-(meth)acrylic acid alkyl ester copolymer (L)> The ethylene-(meth)acrylic acid alkyl ester copolymer (L) of the present invention is a copolymer synthesized from ethylene and a (meth)acrylic acid alkyl ester monomer. The ethylene-(meth)acrylic acid alkyl ester copolymer (L) may be used alone or in combination of two or more kinds.

[0027] In the ethylene-(meth)acrylic acid alkyl ester copolymer (L), the (meth)acrylic acid alkyl ester monomer can be used without any limitation on its type, as long as it is a (meth)acrylate having an alkyl group at the molecular terminal.

[0028] Examples of the (meth)acrylic acid alkyl ester monomer include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, etc. The (meth)acrylic acid alkyl ester monomer may be used alone or in combination of two or more kinds.

[0029] The ethylene-(meth)acrylic acid alkyl ester copolymer (L) may contain other monomers as needed. Examples of the other monomers include saturated carboxylic acid vinyl esters such as vinyl acetate, vinyl propionate, and vinyl butyrate. The other monomers may be used alone or in combination of two or more.

[0030] In the ethylene-(meth)acrylic acid alkyl ester copolymer (L), the proportion (content) of the structural units derived from the (meth)acrylic acid alkyl ester monomer is preferably 2% by mass or more, more preferably 5% by mass or more, from the viewpoint of improving noise reduction characteristics, and is preferably 40% by mass or less, more preferably 35% by mass or less, from the viewpoint of improving noise reduction characteristics. The content of the (meth)acrylic acid alkyl ester monomer can be measured, for example, by measuring the wavelength of the (meth)acrylic acid alkyl ester monomer at 1039 cm by infrared absorption spectroscopy. -1 The absorbance can be determined from a calibration curve obtained by measuring the absorbance using a standard sample whose concentration of the (meth)acrylic acid alkyl ester monomer has been determined in advance by nuclear magnetic resonance spectroscopy.

[0031] From the viewpoint of improving workability in the production process of a PC / ABS resin composition, the ethylene-(meth)acrylic acid alkyl ester copolymer (L) preferably has a melt mass flow rate (hereinafter also referred to as MFR) of 0.2 to 40 (g / 10 min), more preferably 0.4 to 30 (g / 10 min). The MFR can be measured in accordance with JIS K6924-1 (1997 edition).

[0032] Commercially available products of the ethylene-(meth)acrylic acid alkyl ester copolymer (L) include, for example, "Rexpearl A6200," "Rexpearl A4250," and "Rexpearl A3100" manufactured by Japan Polyethylene Corporation.

[0033] <Graft copolymer (M)> The graft copolymer (M) is a graft copolymer obtained by reacting an ethylene-(meth)acrylic acid alkyl ester copolymer (A) with a monomer component (B) containing one or more monomers selected from the group consisting of a (meth)acrylic acid alkyl ester monomer (b-1) and an aromatic vinyl monomer (b-2).

[0034] The ethylene-(meth)acrylic acid alkyl ester copolymer (A) is a copolymer synthesized from ethylene and a (meth)alkyl ester monomer. As the ethylene-(meth)acrylic acid alkyl ester copolymer (A), the above-mentioned ethylene-(meth)acrylic acid alkyl ester copolymer (L) can be used. The ethylene-(meth)acrylic acid alkyl ester copolymer (A) may be used alone or in combination of two or more kinds.

[0035] Examples of the (meth)acrylic acid alkyl ester monomer (b-1) include alkyl (meth)acrylates having a linear or branched alkyl group with 1 to 18 carbon atoms. The number of carbon atoms is preferably 1 to 6, and more preferably 1 to 3. Examples of the (meth)acrylic acid alkyl ester monomer include methyl acrylate, ethyl acrylate, butyl acrylate, propyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, propyl methacrylate, hexyl methacrylate, 2-ethylhexyl methacrylate, and lauryl methacrylate. Among these, from the viewpoint of improving noise reduction properties and hydrolysis resistance, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate are preferred. The (meth)acrylic acid alkyl ester monomer (b-1) may be used alone or in combination of two or more.

[0036] Examples of the aromatic vinyl monomer (b-2) include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, and pt-butylstyrene. Among these, styrene and α-methylstyrene are preferred from the viewpoint of improving noise reduction properties. The aromatic vinyl monomer (b-2) may be used alone or in combination of two or more.

[0037] From the viewpoint of improving the dispersibility and hydrolysis resistance of the ethylene-(meth)acrylic acid alkyl ester copolymer (L), the monomer component (B) may further contain one or more monomers selected from the group consisting of (meth)acrylonitrile monomers (b-3) and (meth)acrylic acid hydroxyalkyl ester monomers (b-4).

[0038] Examples of the (meth)acrylonitrile monomer (b-3) include acrylonitrile and methacrylonitrile. Among these, acrylonitrile is preferred from the viewpoint of improving noise reduction properties and hydrolysis resistance. The (meth)acrylonitrile monomer (b-3) may be used alone or in combination of two or more types.

[0039] Examples of the (meth)acrylic acid hydroxyalkyl ester monomer (b-4) include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2,3-dihydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, and hydroxybenzyl methacrylate. Among these, 2-hydroxyethyl methacrylate and 2-hydroxypropyl methacrylate are preferred from the viewpoint of improving noise reduction properties and hydrolysis resistance. The (meth)acrylic acid hydroxyalkyl ester monomer (b-4) may be used alone or in combination of two or more.

[0040] The monomer component (B) may be a monomer other than the above-mentioned monomers. Examples of the other monomers include amide group-containing monomers such as (meth)acrylamide and N,N-dimethyl(meth)acrylamide; carboxyl group-containing monomers such as (meth)acrylic acid; epoxy group-containing monomers such as glycidyl (meth)acrylate; and glycol-based monomers such as polyethylene glycol (meth)acrylate and polypropylene glycol (meth)acrylate. The other monomers may be used alone or in combination of two or more.

[0041] In the monomer component (B), the proportion of one or more monomers selected from the group consisting of the (meth)acrylic acid alkyl ester monomer (b-1) and the aromatic vinyl monomer (b-2) is preferably 50 mass% or more, more preferably 60 mass% or more.

[0042] Furthermore, when one or more monomers selected from the group consisting of the (meth)acrylonitrile monomer (b-3) and the (meth)acrylic acid hydroxyalkyl ester monomer (b-4) are used as the monomer component (B), the proportion of the one or more monomers selected from the group consisting of the (meth)acrylonitrile monomer (b-3) and the (meth)acrylic acid hydroxyalkyl ester monomer (b-4) in the monomer component (B) is preferably 50 mass% or less, more preferably 40 mass% or less.

[0043] In the monomer component (B), the total proportion of one or more monomers selected from the group consisting of the (meth)acrylic acid alkyl ester monomer (b-1) and the aromatic vinyl monomer (b-2), and one or more monomers selected from the group consisting of the (meth)acrylonitrile monomer (b-3) and the (meth)acrylic acid hydroxyalkyl ester monomer (b-4) is preferably 70 mass% or more, more preferably 80 mass% or more, even more preferably 90 mass% or more, and even more preferably 95 mass% or more.

[0044] The monomer component (B) is preferably a combination of butyl acrylate and methyl methacrylate, styrene and (meth)acrylonitrile, or butyl acrylate, styrene, and 2-hydroxypropyl methacrylate. In this case, the mass ratio of butyl acrylate to methyl methacrylate (butyl acrylate / methyl methacrylate) or the mass ratio of styrene to (meth)acrylonitrile (styrene / (meth)acrylonitrile) is preferably 50 / 50 to 90 / 10, more preferably 60 / 40 to 80 / 20, from the viewpoint of improving noise reduction characteristics and hydrolysis resistance. In the above combination of butyl acrylate, styrene, and 2-hydroxypropyl methacrylate, the butyl acrylate is preferably 10 to 40 mass%, the styrene is preferably 10 to 40 mass%, and the 2-hydroxypropyl methacrylate is preferably 10 to 40 mass% of the total of the butyl acrylate, styrene, and 2-hydroxypropyl methacrylate.

[0045] The mass ratio ((A) / (B)) of the ethylene-(meth)acrylic acid alkyl ester copolymer (A) to the monomer component (B) is 50 / 50 to 98 / 2. From the viewpoint of improving noise reduction characteristics and hydrolysis resistance, the mass ratio ((A) / (B)) is preferably 60 / 40 to 95 / 5, and more preferably 70 / 30 to 90 / 10.

[0046] <Method for producing graft copolymer (M)> The method for producing the graft copolymer (M) is not particularly limited, and known polymerization methods such as suspension polymerization, emulsion polymerization, solution polymerization, and bulk polymerization can be used. Among these, suspension polymerization is preferred. The grafting method is also not particularly limited, and known grafting methods such as radical polymerization, cationic polymerization, anionic living polymerization, and cationic living polymerization can be used. Among these, radical polymerization is preferred, and in particular, from the viewpoint of industrially mass-produced graft copolymers efficiently, radical polymerization using a vinyl monomer having a peroxide bond (radical polymerizable organic peroxide) is more preferred.

[0047] The vinyl monomer having a peroxide bond (radical polymerizable organic peroxide) can be used without any particular limitation on its type as long as it is a monomer having a peroxy group and an ethylenically unsaturated group in the molecule, and may be used alone or in combination of two or more types. Examples of the vinyl monomer having a peroxide bond include t-butylperoxy(meth)acryloyloxyethyl carbonate, t-amylperoxy(meth)acryloyloxyethyl carbonate, t-hexylperoxy(meth)acryloyloxyethyl carbonate, t-butylperoxy(meth)acryloyloxyethoxyethyl carbonate, t-hexylperoxy(meth)acryloyloxyethoxyethyl carbonate, t-butylperoxy(meth)allyl carbonate, t-amylperoxy(meth)allyl carbonate, and t-hexylperoxy(meth)allyl carbonate. Of these, t-butylperoxymethacryloyloxyethyl carbonate is preferred.

[0048] The polymerization method using the vinyl monomer having a peroxide bond includes the steps of: adding the monomer component (B), the vinyl monomer having a peroxide bond, and a polymerization initiator to a solution obtained by suspending the ethylene-(meth)acrylic acid alkyl ester copolymer (A) in a water-based medium (ethylene-(meth)acrylic acid alkyl ester copolymer (A) concentration: 10 to 30 parts by weight); impregnating and polymerizing the monomer component (B), the vinyl monomer having a peroxide bond, and the polymerization initiator into the ethylene-(meth)acrylic acid alkyl ester copolymer (A) (particles of the ethylene-(meth)acrylic acid alkyl ester copolymer (A)) to obtain a precursor; and melt-kneading the precursor to produce the graft copolymer (M). If necessary, a suspending agent (e.g., polyvinyl alcohol) may be used in an amount of approximately 0.1 to 1 part by weight per 100 parts by weight of the ethylene-(meth)acrylic acid alkyl ester copolymer (A) in the precursor-obtaining step. During the impregnation, the ethylene-(meth)acrylic acid alkyl ester copolymer (A) may be stirred while being heated (for example, at about 60 to 80°C) in order to thoroughly impregnate the monomer component (B), the vinyl monomer having a peroxide bond, the polymerization initiator, and the like into the copolymer.

[0049] The polymerization initiator is not particularly limited as long as it generates radicals by heat, and examples thereof include organic peroxides, azo-based polymerization initiators, etc. The polymerization initiators may be used alone or in combination of two or more.

[0050] From the viewpoint of suppressing rapid decomposition of the polymerization initiator and suppressing the residue of the polymerization initiator and the monomer, the polymerization initiator preferably has a 10-hour half-life temperature (hereinafter also referred to as T10) of 40° C. or higher, more preferably 50° C. or higher, and preferably 130° C. or lower, more preferably 100° C. or lower, and even more preferably 80° C. or lower. The 10-hour half-life temperature (T10) means the temperature at which the polymerization initiator reaches its half-life in 10 hours when a solution obtained by dissolving the polymerization initiator in benzene to a concentration of, for example, 0.05 to 0.1 mol / L is thermally decomposed.

[0051] Examples of the polymerization initiator include t-butyl peroxyneoheptanoate (T10=51°C), t-hexyl peroxypivalate (T10=53°C), t-butyl peroxypivalate (T10=55°C), di(3,5,5-trimethylhexanoyl) peroxide (T10=59°C), dilauroyl peroxide (T10=62°C), 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (T10=65°C), 2,5-dimethyl-2,5-di(2-ethylhexanoyl)per ...2,5-dimethyl-2,5-di(2-ethylhexanoyl)peroxide (T10=62°C), 2,5-dimethyl-2,5-di(2-ethylhexanoyl)peroxide (T10=62°C), 2,5-dimethyl-2,5-di(2-ethylhexanoyl)peroxide (T10=62°C), 2,5-dimethyl-2,5-di(2-ethylhexanoyl)peroxide (T10=62°C), 2,5-dimethyl-2,5-di(2-ethylhexanoyl)peroxide ( Oxy)hexane (T10 = 66°C), t-hexylperoxy-2-ethylhexylhexanoate (T10 = 70°C), di(4-methylbenzoyl) peroxide (T10 = 71°C), t-butylperoxy-2-ethylhexanoate (T10 = 72°C), benzoyl peroxide (T10 = 74°C), t-hexylperoxyisopropyl monocarbonate (T10 = 95°C), t-butylperoxy-3,5,5-trimethylhexanoate (T10 = 97°C), t-butylperoxylaureate (T10 = 98°C), t-butylperoxyisopropyl monocarbonate (T10 = 99°C), t-butylperoxy-2-ethylhexyl monocarbonate (T10 = 99°C), t-hexyl peroxybenzoate (T10 = 99°C), 2,5-dimethyl-2,5-di(benzoylperoxy)hexane (T10 = 100°C), t-butyl peroxyacetate (T10 = 102°C), 2,2-di(t-butylperoxy)butane (T10 = 103°C), t-butyl peroxybenzoate (T10 = organic peroxides such as n-butyl-4,4-di(t-butylperoxy)valerate (T10=105°C), di(2-t-butylperoxyisopropyl)benzene (T10=119°C), dicumyl peroxide (T10=116°C), di-t-hexyl peroxide (T10=116°C), 2,5-dimethyl-2,5-di(t-butylperoxy)hexane (T10=118°C), t-butylcumyl peroxide (T10=120°C), and di-t-butyl peroxide (T10=124°C);Examples of azo polymerization initiators include 2,2-azobis(2,4-dimethylvaleronitrile) (T10=51°C), 2,2-azobis(isobutyronitrile) (T10=65°C), and 2,2-azobis(2-methylbutyronitrile) (T10=67°C).

[0052] In the step of producing the precursor, the polymerization temperature cannot be determined in general because it varies depending on the raw materials (particularly the 10-hour half-life temperature of the polymerization initiator), but is usually preferably 65° C. or higher, more preferably 70° C. or higher, and preferably 90° C. or lower, more preferably 85° C. or lower. The polymerization time cannot be determined in general because it varies depending on the raw materials, reaction temperature, etc., but from the viewpoint of increasing the yield, it is preferably 1.5 hours or higher, more preferably 2 hours or higher, and preferably 6 hours or lower, more preferably 5 hours or lower.

[0053] In the step of producing the precursor, the amount of the vinyl monomer having a peroxide bond is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and even more preferably 3 parts by mass or more, relative to 100 parts by mass of the monomer component (B), and is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and even more preferably 6 parts by mass or less.

[0054] In the step of producing the precursor, the amount of the polymerization initiator is preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, and is preferably 3 parts by mass or less, more preferably 2 parts by mass or less, relative to 100 parts by mass of the monomer component (B).

[0055] Examples of the melt-kneading include a method in which the precursor is melted and kneaded using a kneader such as a Banbury mixer, kneader, kneading extruder, twin-screw extruder, or roll. The kneading may be performed once or multiple times. The kneading time varies depending on the size of the kneader used, but is usually about 3 to 10 minutes. The discharge temperature of the kneader is preferably 130 to 350°C, and more preferably 150 to 250°C.

[0056] <Styrene-based elastomer (N)> The styrene elastomer (N) is a block copolymer containing a polymer block D mainly composed of polystyrene and a polymer block E mainly composed of a conjugated diene compound. Examples of the styrene elastomer (N) include block copolymers having structures such as DE, DED, EDED, and DEDED. From the viewpoint of moldability, the styrene elastomer (N) preferably contains two or more polymer blocks D in the molecule. In addition, in the polymer block E, the bonding mode between the conjugated diene compound and the conjugated diene compound is not particularly limited and is optional. When there are two or more polymer blocks E in the molecule, they may have the same structure or different structures. The styrene elastomer (N) may be used alone or in combination of two or more types.

[0057] In the styrene elastomer (N), the proportion of structural units derived from polystyrene is preferably 5 to 65% by mass, more preferably 10 to 60% by mass, from the viewpoint of improving noise reduction properties.

[0058] The hydrogenation rate of the styrene elastomer (N) (the ratio of the number of carbon-carbon single bonds that have been formed by hydrogenation to the number of carbon-carbon double bonds in the block copolymer of polystyrene and the conjugated diene compound before hydrogenation) is not particularly limited, but is usually 50 mol% or more, preferably 70 mol% or more, and more preferably 90 mol% or more.

[0059] Examples of the styrene elastomer (N) include styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butene block copolymer (SEB), styrene-ethylene-propylene block copolymer (SEP), styrene-ethylene-butene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-ethylene-ethylene-propylene-styrene block copolymer (SEEPS), styrene-vinyl(ethylene-propylene)-styrene copolymer (V-SEPS), etc. Among these, from the viewpoint of improving noise reduction properties, styrene-ethylene-butene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), and styrene-ethylene-ethylene-propylene-styrene block copolymer (SEEPS) are preferred.

[0060] <Modified Polyolefin Wax (O)> The modified polyolefin wax (O) of the present invention has a functional group selected from the group consisting of a carboxyl group, a ketone group, and a hydroxyl group. The modified polyolefin wax (O) may be used alone or in combination of two or more kinds.

[0061] Examples of the modified polyolefin wax (O) include oxidized olefin waxes such as oxidized polyethylene wax, which are obtained by introducing air into a polymer of an olefin monomer such as ethylene monomer or its thermal decomposition product in a molten state at 140°C to 180°C to introduce functional groups through an oxidation reaction; unsaturated carboxylic acids having 3 to 8 carbon atoms, such as acrylic acid, methacrylic acid, vinyl acetate, vinyl propionate, maleic acid, maleic anhydride, itaconic acid, and maleic acid monomethyl ester; and metal salts of these acids, which are all or partly neutralized with monovalent or divalent metal cations, such as sodium, potassium, lithium, zinc, magnesium, and calcium; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate; Preferred examples of the acid-modified olefin wax include acid-modified polyethylene wax and acid-modified polypropylene wax obtained by copolymerizing, block polymerizing, or graft polymerizing functional group-containing monomers such as n-propyl acrylate, n-propyl methacrylate, isobutyl acrylate, isobutyl methacrylate, n-butyl acrylate, n-butyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, monomethyl maleate, glycidyl acrylate, glycidyl methacrylate, vinyl acetate, acrylamine, and acrylamide. Of these, acid-modified polyethylene wax, oxidized polyethylene wax, and acid-modified polypropylene wax are preferred from the viewpoint of improving hydrolysis resistance.

[0062] From the viewpoint of improving hydrolysis resistance, the melt viscosity of the modified polyolefin wax (O) at 120°C is preferably 10 to 10,000 mPa·s, more preferably 20 to 5,000 mPa·s, and even more preferably 50 to 3,500 mPa·s.

[0063] The dropping point of the modified polyolefin wax (O) is preferably 80° C. or higher and 170° C. or lower, more preferably 90° C. or higher and 150° C. or lower, from the viewpoint of improving hydrolysis resistance. The acid value of the modified polyolefin wax (O) is preferably 10 mg KOH / g or higher, more preferably 15 mg KOH / g or higher, from the viewpoint of improving hydrolysis resistance. It is also preferably 50 mg KOH / g or lower.

[0064] In order to improve noise reduction properties, the content of the ethylene-(meth)acrylic acid alkyl ester copolymer (L) in the resin composition (Y) is preferably 15 to 40 mass %, more preferably 20 mass % or more, and more preferably 35 mass % or less.

[0065] From the viewpoint of improving noise reduction properties, the content of the graft copolymer (M) in the resin composition (Y) is preferably 0.5 to 25% by mass, more preferably 1% by mass or more, even more preferably 3% by mass or more, and more preferably 20% by mass or less.

[0066] In order to improve noise reduction properties, the content of the styrene elastomer (N) in the resin composition (Y) is preferably 35 to 65% by mass, more preferably 40% by mass or more, and more preferably 60% by mass or less.

[0067] In order to improve hydrolysis resistance, the content of the modified polyolefin wax (O) in the resin composition (Y) is preferably 5 to 25% by mass, more preferably 10% by mass or more, and more preferably 20% by mass or less.

[0068] In the resin composition (Y), the total proportion of the ethylene-(meth)acrylic acid alkyl ester copolymer (L), the graft copolymer (M), the styrene-based elastomer (N), and the modified polyolefin wax (O) is preferably 70 mass% or more, more preferably 80 mass% or more, even more preferably 90 mass% or more, and even more preferably 95 mass% or more.

[0069] The resin composition (Y) is preferably 1 to 15 parts by mass relative to 100 parts by mass of the thermoplastic resin (X). From the viewpoint of improving the noise reduction properties and hydrolysis resistance of the resin molded article, the resin composition (Y) is more preferably 2 parts by mass or more, even more preferably 5 parts by mass or more, and even more preferably 12 parts by mass or less relative to 100 parts by mass of the thermoplastic resin (X).

[0070] The thermoplastic resin composition of the present invention may contain various compounding agents, such as fiber reinforcement materials such as ceramic fiber (CF), glass fiber, aramid fiber, potassium titanate fiber, crushed mineral fiber, silica fiber, alumina fiber, gypsum fiber, magnesium hydroxide fiber, silicon carbide fiber, and zirconia fiber; spherical silica, mica, wollastonite, calcium carbonate, kaolin, clay, bentonite, sericite, glass beads, glass flakes, alumina, calcium silicate, magnesium carbonate, talc, zinc oxide, titanium oxide, iron oxide, graphite, and carbon. These include organic or inorganic fillers in various forms such as carbon black, molybdenum disulfide, and ultra-high density polyethylene; lubricants such as mineral oil, hydrocarbons, fatty acids, fatty acid esters, fatty acid amides, alcohols, metallic soaps, natural waxes, and silicones; processing aids such as PTFE and acrylic; inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide; organic flame retardants such as halogen-based and phosphorus-based; antioxidants, UV inhibitors, light stabilizers, colorants, antistatic agents, crosslinking agents, dispersants, coupling agents, foaming agents, and colorants.

[0071] The thermoplastic resin composition of the present invention can be obtained by melt-kneading the thermoplastic resin (X), the ethylene-(meth)acrylic acid alkyl ester copolymer (L), the graft copolymer (M), the styrene-based elastomer (N), and the modified polyolefin wax (O). Examples of the melt-kneading include a method of melting and kneading the precursors using a kneader such as a Banbury mixer, a kneader, a kneading extruder, a twin-screw extruder, or a roll. The kneading may be performed once or multiple times. The kneading time varies depending on the size of the kneader used, but is typically about 3 to 10 minutes. The discharge temperature of the kneader is preferably 150 to 350°C, more preferably 180 to 250°C.

[0072] The thermoplastic resin composition of the present invention can be obtained by mixing the thermoplastic resin (X), the resin composition (Y), and any of the various compounding ingredients. The mixing method is not particularly limited, and examples include melting and kneading using a kneader such as a Banbury mixer, kneader, kneading extruder, twin-screw extruder, or roll. The components may be added and kneaded in any order, or simultaneously. Kneading may be performed once or multiple times. The kneading time varies depending on the size of the kneader used, but is typically about 3 to 10 minutes. The discharge (extrusion) temperature of the kneader is preferably 150 to 350°C, more preferably 180 to 250°C.

[0073] The thermoplastic resin molded article of the present invention can be obtained by molding the thermoplastic resin composition into a predetermined shape. The molding method is not limited to, but examples include, injection molding and extrusion molding, and the heating temperature, pressure, time, etc. of the molding can be appropriately set. The thermoplastic resin molded article has excellent quiescent properties and hydrolysis resistance, and can be used as electrical parts, electronic parts, machine parts, precision instrument parts, and automotive parts. [Example]

[0074] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0075] <Production of Graft Copolymer (M1)> 2500 g of pure water was placed in a 5 L stainless steel autoclave, and 2.5 g of polyvinyl alcohol was dissolved therein as a suspending agent. 800 g of ethylene-ethyl acrylate copolymer (A1) (trade name "Rexpearl A4200", manufactured by Japan Polyethylene Co., Ltd.) was added as the ethylene-(meth)acrylic acid alkyl ester copolymer (A) and dispersed by stirring.

[0076] Furthermore, a solution was prepared by dissolving 5.1 g of di(3,5,5-trimethylhexanoyl) peroxide (manufactured by NOF Corporation, trade name "Perloyl 355", 10-hour half-life temperature = 59°C) as a polymerization initiator, 17.2 g of t-butylperoxymethacryloyloxyethyl carbonate (hereinafter also referred to as MEC) as a vinyl monomer having a peroxide bond, 114 g of butyl acrylate (hereinafter also referred to as BA) as a (meth)acrylic acid alkyl ester copolymer (b-1), 114 g of styrene (hereinafter also referred to as St) as (b-2), and 114 g of 2-hydroxypropyl methacrylate (hereinafter also referred to as HPMA) as (b-4) in a monomer component (B), and this solution was charged into the autoclave and stirred.

[0077] The autoclave was then heated to 60-65°C and stirred for 3 hours, thereby impregnating the ethylene-(meth)acrylic acid alkyl ester copolymer (A) with the radical polymerization initiator, t-butylperoxymethacryloyloxyethyl carbonate, and monomer component (B). The autoclave was then heated to 80-85°C and maintained at that temperature for 7 hours to allow polymerization, yielding a copolymer (an ethylene-(meth)acrylic acid ethyl ester copolymer composition impregnated with poly(BA / St / HPMA / MEC)) as a precursor. The resulting precursor was melt-kneaded at 230°C using a Labo Plastomill single-screw extruder (manufactured by Toyo Seiki Seisakusho, Ltd.) to undergo a grafting reaction. A strand-shaped resin composition was then obtained, which was then cut into pellets to produce the graft copolymer (M1).

[0078] <Production of Graft Copolymers (M2 to M5, M´1 to M´2)> Graft copolymers (M2 to M5, M'1) were produced in the same manner as for graft copolymer (M1), except that the type and amount (mass%) of each raw material were changed as shown in Table 1. Note that M'2 indicates that the ethylene-ethyl acrylate copolymer (A1) was used as is.

[0079] [Table 1]

[0080] In Table 1, A1 is an ethylene-ethyl acrylate copolymer (manufactured by Japan Polyethylene Co., Ltd., trade name "Rexpearl A4200", proportion of structural units derived from ethyl acrylate is 20 parts by mass, MFR is 5 (g / 10 min)); A2 is an ethylene-ethyl acrylate copolymer (manufactured by Japan Polyethylene Co., Ltd., trade name "Rexpearl A3100", proportion of structural units derived from ethyl acrylate is 10 parts by mass, MFR is 3 (g / 10 min)); BA is butyl acrylate; MMA, methyl methacrylate; St, styrene; AN is acrylonitrile; HPMA refers to 2-hydroxypropyl methacrylate;

[0081] <Production of Resin Composition (Y1)> 35 g of ethylene-ethyl acrylate copolymer (L1) (trade name "Rexpearl A4200" manufactured by Japan Polyethylene Co., Ltd.) as the ethylene-(meth)acrylic acid alkyl ester copolymer (L), 10 g of the graft copolymer (M1), 45 g of styrene-ethylene-butylene-styrene (SEBS) block copolymer (trade name "Kraton G1652" manufactured by Kraton Polymers Co., Ltd.) as the styrene-based elastomer (N), and 10 g of oxidized polyethylene wax (O1) (trade name "LICOWAX PED521" manufactured by Clariant Chemicals Co., Ltd.) as the modified polyolefin wax (O) were dry-blended. The mixture was then melt-kneaded (extrusion temperature: 140 to 160°C) using a twin-screw extruder (PCM-30, manufactured by Ikegai Co., Ltd.). A strand-shaped resin composition was then obtained, which was then cut into pellets to obtain resin composition (Y1).

[0082] <Production of Resin Compositions (Y2 to Y14, Y'1 to Y'8)> Resin composition (Y1) was produced in the same manner as resin composition (Y1), except that the types of raw materials and the amounts (parts by mass) of each raw material were changed as shown in Table 2.

[0083] [Table 2]

[0084] In Table 2, L1 is an ethylene-ethyl acrylate copolymer (manufactured by Japan Polyethylene Co., Ltd., trade name "Rexpearl A4200", proportion of structural units derived from ethyl acrylate is 20 parts by mass, MFR is 5 (g / 10 min)); L2 is an ethylene-ethyl acrylate copolymer (manufactured by Japan Polyethylene Co., Ltd., trade name "Rexpearl A3100", the proportion of structural units derived from ethyl acrylate is 10 parts by mass, and the MFR is 3 (g / 10 min)); N1 is a styrene-ethylene-butylene-styrene (SEBS) block copolymer (Kraton Polymers, Inc., trade name "Kraton G1651"); N2 is a styrene-ethylene-propylene-styrene (SEPS) block copolymer (manufactured by Kuraray Co., Ltd., trade name "Septon 2006"); N3 is a styrene-ethylene-ethylene-propylene-styrene (SEEPS) block copolymer (manufactured by Kuraray Co., Ltd., trade name "Septon 4045"); N4 represents a styrene-ethylene-propylene (SEP) block copolymer (manufactured by Kuraray Co., Ltd., trade name "Septon 1001"); O1 is an oxidized polyethylene wax, which is a modified polyolefin wax (manufactured by Clariant Chemicals Co., Ltd., trade name "LICOWAX PED521", acid value 15 to 19, melt viscosity at 120°C 350 mPa·s); O2 is a modified polyolefin wax, oxidized polyethylene wax (manufactured by Clariant Chemicals Co., Ltd., trade name "LICOCOWAX PED153", acid value 22-27, melt viscosity at 120°C 2000 mPa·s); O3 is a modified polyolefin wax, an acid-modified polyethylene wax (manufactured by Clariant Chemicals Co., Ltd., trade name "LICOCENE PEMA4221", acid value 16-20, melt viscosity at 120°C 350 mPa·s); O4 is an acid-modified polypropylene wax (manufactured by Clariant Chemicals Co., Ltd., trade name "LICOCENE PPMA6252", acid value 38 to 45, melt viscosity at 120°C 2000 mPa·s); O'1 represents polyethylene wax (manufactured by Clariant Chemicals, trade name "LICOWAX PE520", acid value 0, melt viscosity at 120°C 1000 mPa·s);

[0085] Example 1 <Production of Thermoplastic Resin Composition> 100 g of a PC / ABS resin (X1) (trade name "BayblendT65XF", manufactured by Covestro) as the thermoplastic resin (X) and 10 g of the above resin composition (Y1) were melt-kneaded (extrusion temperature: 230 to 250°C) using a twin-screw extruder (PCM-30, manufactured by Ikegai). Next, a strand-shaped thermoplastic resin composition was obtained, and then this was cut to obtain a pellet-shaped thermoplastic resin composition.

[0086] <Evaluation of noise reduction characteristics> The pellets obtained above were injection molded (barrel temperature: 240-250°C, mold temperature: 80°C) to prepare evaluation test pieces (length: 60 mm x width: 100 mm x thickness: 2 mm). The test pieces (evaluation materials) were then cut into plates (55 mm x 80 mm x 2 mm) for noise reduction test. After deburring, the plates were left at a temperature of 25°C and a humidity of 50% RH for 12 hours. The mating material was polyvinyl chloride (PVC) leather (manufactured by Shinko Co., Ltd., "PVC knitted fabric width 1250 mm, all-purpose fabric cut-out"). The noise reduction test plate and the mating PVC leather were then fixed to a Ziegler stick-slip measuring device SSP-04 and rubbed against each other under conditions of a load of 40 N and a speed of 1 mm / s. The squeak risk value was measured and evaluated according to the following criteria. Squeaking noise risk value 1-3: Low risk of squeak noise Squeaking noise risk score 4-5: Slightly high risk of squeaking noise Squeaking noise risk value 6-10: High risk of squeaking noise occurrence

[0087] In the evaluation of the noise reduction properties, the thermoplastic resin molded article of the present invention was rated as good if it had a creaking noise risk value of 3 or less.

[0088] <Hydrolysis resistance evaluation> The pellets obtained above were injection molded (barrel temperature: 240-250°C, mold temperature: 80°C) to prepare No. 2 dumbbell test pieces (length: 115 mm x width: 25 mm x thickness: 3 mm) for evaluation. The prepared test pieces were left to stand in a constant temperature and humidity chamber at a temperature of 80°C and a humidity of 95% RH for one week to allow hydrolysis, and then a tensile test was carried out in accordance with JIS K 7113 to measure the tensile strength (MPa). The strength retention rate (%) was calculated using the following formula (1): Strength retention rate (%) = {(initial test piece strength / strength after hydrolysis) × 100}

[0089] The resin molding of the present invention was rated as passing if the strength retention rate (%) was 80% or more.

[0090] <Examples 2 to 16 and Comparative Examples 1 to 10> <Production of Thermoplastic Resin Composition> Thermoplastic resin compositions were produced in the same manner as in Example 1, except that the types of raw materials and the amounts (parts by mass) of each raw material were changed as shown in Tables 3 and 4.

[0091] The raw materials obtained above and the thermoplastic resin compositions of the comparative examples were used, and the results of evaluation by the above evaluation methods are shown in Tables 3 and 4.

[0092] [Table 3]

[0093] [Table 4]

[0094] In Tables 3 and 4, X1 is PC / ABS resin (manufactured by Covestro, product name "Bayblend T65XF"); X2 is PC resin (manufactured by Idemitsu Kosan Co., Ltd., product name "Toughlon A2200");

[0095] The thermoplastic resin compositions of Examples 1 to 16 obtained evaluation results that satisfied the target values ​​for noise reduction properties and hydrolysis resistance.

[0096] In Comparative Example 1, the mass ratio ((A) / (B)) of the ethylene-(meth)acrylic acid alkyl ester copolymer (A) to the monomer component (B) in the graft copolymer (M) was 40 / 60, and therefore the noise reduction properties and hydrolysis resistance were poor.

[0097] In Comparative Example 2, the mass ratio ((A) / (B)) of the ethylene-(meth)acrylic acid alkyl ester copolymer (A) to the monomer component (B) in the graft copolymer (M) was 100 / 0, and therefore the noise reduction properties and hydrolysis resistance were poor.

[0098] In Comparative Example 3, polyethylene wax was used instead of the modified polyolefin wax (O), and therefore noise reduction properties and hydrolysis resistance were poor.

[0099] Comparative Example 4 did not contain the graft copolymer (M), and therefore was inferior in noise reduction properties and hydrolysis resistance.

[0100] Comparative Example 5 did not contain the styrene elastomer (N), and therefore was inferior in noise reduction properties and hydrolysis resistance.

[0101] Comparative Example 6 did not contain the modified polyolefin wax (O), and therefore was inferior in noise reduction properties and hydrolysis resistance.

[0102] In Comparative Example 7, the resin composition (Y) was composed solely of a styrene-based elastomer, and therefore the noise reduction properties and hydrolysis resistance were poor.

[0103] In Comparative Example 8, the resin composition (Y) was composed only of modified polyolefin wax, and therefore the noise reduction properties and hydrolysis resistance were poor.

[0104] In Comparative Examples 9 and 10, the thermoplastic resin (X) was used as is, and therefore the noise reduction properties and hydrolysis resistance were poor.

Claims

1. A thermoplastic resin composition containing a thermoplastic resin (X) and a resin composition (Y), the thermoplastic resin (X) is a polycarbonate resin or a mixed resin of a polycarbonate resin and a resin having a rubber polymer, a vinyl cyanide monomer, and an aromatic vinyl monomer as structural units; The resin composition (Y) contains an ethylene-(meth)acrylic acid alkyl ester copolymer (L), a graft copolymer (M), a styrene-based elastomer (N), and a modified polyolefin wax (O), The graft copolymer (M) is a graft copolymer obtained by reacting an ethylene-(meth)acrylic acid alkyl ester copolymer (A) with a monomer component (B) containing one or more monomers selected from the group consisting of a (meth)acrylic acid alkyl ester copolymer (b-1) and an aromatic vinyl monomer (b-2); the modified polyolefin wax (O) is an oxidized polyolefin wax or an acid-modified polyolefin wax having one or more functional groups selected from the group consisting of a carboxyl group, a ketone group, and a hydroxyl group; A thermoplastic resin composition characterized in that the mass ratio ((A) / (B)) of the ethylene-(meth)acrylic acid alkyl ester copolymer (A) to the monomer component (B) is 50 / 50 to 98 / 2.

2. The thermoplastic resin composition according to claim 1, wherein the monomer component (B) further contains one or more monomers selected from the group consisting of (meth)acrylonitrile monomers (b-3) and (meth)acrylic acid hydroxyalkyl ester monomers (b-4).

3. The thermoplastic resin composition according to claim 1 or 2, wherein, in the resin composition (Y), a proportion of the ethylene-(meth)acrylic acid alkyl ester copolymer (L) is 15 to 40 mass%, a proportion of the graft copolymer (M) is 0.5 to 25 mass%, a proportion of the styrene-based elastomer (N) is 35 to 65 mass%, and a proportion of the modified polyolefin wax (O) is 5 to 25 mass%.

4. The thermoplastic resin composition according to any one of claims 1 to 3, wherein the modified polyolefin wax (O) is one or more waxes selected from the group consisting of oxidized polyethylene wax, acid-modified polypropylene wax, and acid-modified polyethylene wax.

5. The thermoplastic resin composition according to any one of claims 1 to 4, characterized in that the resin composition (Y) is 1 to 15 parts by mass relative to 100 parts by mass of the thermoplastic resin (X).

6. The thermoplastic resin composition according to any one of claims 1 to 5, wherein the styrene-based elastomer (N) is a block copolymer containing a polymer block having a polystyrene and a polymer block having a conjugated diene compound.

7. A thermoplastic resin molded article obtained from the thermoplastic resin composition according to any one of claims 1 to 6.

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