Resin compositions, molding materials, and molded articles

Abstract

Realization of a resin composition with excellent long-term properties and resistance to discoloration. [Solution] The resin composition of the present disclosure comprises an aromatic vinyl resin (A), a polymer (B), and a polymer (C). Polymer (B) has a polymer (B1) portion having a crosslinked structure and a polymer (B2) portion having a constituent unit (b2) derived from alkyl (meth)acrylate. Polymer (C) has substantially no crosslinked structure.

Description

[Technical Field]

[0001] This invention relates to resin compositions, molding materials, and molded articles. [Background technology]

[0002] Resins that have aromatic vinyl monomer units as their constituent units, such as high-impact polystyrene (HIPS) or acrylonitrile-butadiene-styrene (ABS), are widely used in office automation equipment and home appliances, taking advantage of their excellent heat resistance and impact resistance.

[0003] For example, Patent Document 1 discloses a compound material in which a propylene-ethylene copolymer is added to a general-purpose polystyrene and HIPS mixed resin, and a styrene-dienblock copolymer is used as a compatibilizer. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2000-212357 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, HIPS or ABS are resins containing butadiene rubber, and a challenge is that the double bonds in the butadiene rubber deteriorate over time, causing discoloration.

[0006] One aspect of the present invention is to provide a resin composition having excellent long-term properties and discoloration resistance. [Means for solving the problem]

[0007] As a result of repeated studies to solve the above problems, the present inventors have invented a resin composition that can be used over a long period of time and has excellent long-term properties and discoloration resistance by including a specific copolymer (B) and a polymer (C) that substantially does not have a crosslinked structure in an aromatic vinyl resin. That is, the gist of the present invention is as follows.

[0008] [1] An aromatic vinyl resin (A), a polymer (B), and a polymer (C), The polymer (B) has a polymer (B1) portion having a crosslinked structure and a polymer (B2) portion having a structural unit (b2) derived from an alkyl (meth)acrylate, A resin composition in which the polymer (C) substantially does not have a crosslinked structure. [2] The resin composition according to [1], wherein the content of the polymer (B1) portion is 70% by mass or more and 95% by mass or less based on 100% by mass in total of the polymer (B1) portion and the polymer (B2) portion. [3] The resin composition according to [1] or [2], wherein the polymer (B1) portion has a structural unit (b1) derived from an alkyl (meth)acrylate. [4] The resin composition according to any one of [1] to [3], wherein the structural unit (b2) is a structural unit derived from methyl methacrylate. [5] The resin composition according to any one of [1] to [4], wherein the polymer (C) is a copolymer containing a structural unit derived from the following general formula (1) and / or the following general formula (2). [Chemical formula] (In formula (1), V 1 ~V 4 are each independently a hydrogen atom, an alkyl group, a vinyl group, an aryl group or a heterocyclic group.) [Chemical formula] (In formula (2), W 1 and W 2Each of these is independently a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group. Y represents an ester bond, an amide bond, a carbonyl bond, or an ether bond. [6] The resin composition according to [1] to [5], wherein the polymer (C) comprises a polymer (C1) portion containing 50% by mass or more of repeating units derived from methyl methacrylate and a polymer (C2) portion having a glass transition temperature of 0°C or lower, comprising a block copolymer and / or a graft copolymer. [7] The resin composition according to [6], wherein the polymer (C) contains 50% by mass or less of the polymer (C1) portion. [8] The resin composition according to any one of [1] to [7], wherein the weight-average molecular weight (Mw) of the polymer (C) is 300,000 or more. [9] The resin composition according to any one of [1] to [8], wherein the polymer (C) comprises a constituent unit derived from a macromonomer (c1) represented by the following general formula (3). [ka] (In formula (3), R 0 ~R n Each of these is independently a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group. 1 ~X n (Each of these is either a hydrogen atom or a methyl group. Z is a terminal group. n is a natural number between 1 and 10,000.)

[10] The resin composition according to any one of [1] to [9], wherein the polymer (C) is a random copolymer containing 1% by mass or more and 50% by mass or less of constituent units derived from (meth)acrylate.

[11] The resin composition according to any one of [1] to

[10] , wherein the polymer (C) comprises constituent units derived from monomers having a glass transition temperature of 0°C or less.

[12] The resin composition according to any one of [1] to

[11] , wherein the polymer (C) comprises constituent units derived from an aromatic vinyl monomer.

[13] The resin composition according to any one of [1] to

[12] , wherein the polymer (C) is a hydrogenated styrene-diene block copolymer.

[14] The resin composition according to any one of [1] to

[13] , wherein the aromatic vinyl resin (A) is polystyrene.

[15] The resin composition according to any one of [1] to

[14] , wherein the content of the aromatic vinyl resin (A) is 1% by mass or more and 99% by mass or less, based on 100% by mass of the total of the aromatic vinyl resin (A) and the polymer (B).

[16] The resin composition according to any one of [1] to

[15] , wherein the content of the polymer (C) is 1% by mass or more and 500% by mass or less, based on 100% by mass of the total of the aromatic vinyl resin (A) and the polymer (B). A molding material comprising the resin composition described in any of

[17] [1] to

[16] . A molded body obtained by molding the molding material described in

[18] and

[17] . [Effects of the Invention]

[0009] A resin composition according to one aspect of the present invention, a molding material containing the resin composition, and a molded article are excellent in long-term properties and discoloration resistance because they do not suffer a decrease in mechanical properties due to the deterioration of double bonds, and can be used for a long period of time. [Modes for carrying out the invention]

[0010] The embodiments for carrying out the present invention will be described in detail below, but the present invention is not limited to the following description and can be implemented in various ways within the scope of its gist.

[0011] [Definition] In this invention, "(meth)acrylic" means either or both "acrylic" and "methacrylic". Similarly, "(meth)acrylate" means either or both "methacrylate" and "acrylate". The same applies to "(meth)acryloyl".

[0012] In the present invention, "monomer" means an unpolymerized compound (monomer component before polymerization), and "repeating unit" and "constituent unit" mean constituent units that make up a polymer derived from the monomer, which is formed by the polymerization of the monomer. Furthermore, the constituent units that make up the polymer are called "monomer units". The "repeating unit" or "constituent unit" may be a unit directly formed by a polymerization reaction, or a part of the unit may be converted to a different structure by processing the polymer.

[0013] In this invention, "mass%" indicates the content of a specific component in 100% of the total amount by mass.

[0014] In the present invention, unless otherwise specified, a numerical range represented by "~" in this specification means a range that includes the numbers written before and after "~" as the lower and upper limits, and "A~B" means A or greater and B or less.

[0015] Furthermore, in this invention, the mass-average molecular weight (Mw) of aromatic vinyl resin (A), polymer (B), and polymer (C) refers to the mass-average molecular weight, which is the relative molecular weight obtained by gel permeation chromatography (GPC) in terms of polymethyl methacrylate (PMMA).

[0016] [Resin composition] A resin composition according to one aspect of the present invention comprises an aromatic vinyl resin (A), a polymer (B) having a polymer (B1) portion having a crosslinked structure and a polymer (B2) portion having constituent units (b2) derived from alkyl (meth)acrylate, and a polymer (C) substantially without a crosslinked structure.

[0017] In the present invention, "a polymer that does not substantially have a crosslinked structure" refers to a polymer in which no insoluble matter is present when the polymer is dissolved in THF (tetrahydrofuran).

[0018] [Aromatic vinyl resin (A)] A resin composition according to one aspect of the present invention comprises an aromatic vinyl resin (A). The aromatic vinyl resin (A) comprises aromatic vinyl monomer (a1) units. Optionally, the aromatic vinyl resin (A) may also contain other monomers (a2) that can polymerize with the aromatic vinyl monomer (a1).

[0019] Examples of aromatic vinyl monomers (a1) include vinyl benzoate, vinyl cinnamate, vinyl 2-chlorobenzoate, vinyl 4-butylbenzoate, chloro(methyl)(phenyl)(vinyl)silane, 1,3-dimethyl-1,3-diphenyl-1,3-divinyldisiloxane, 9-vinylcarbazole, N-vinylphthalimide, 1,3-butadiene-2-ylbenzene, styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, β-methylstyrene, ethylstyrene, p-tert-butylstyrene, vinyltoluene, vinylxylene, vinylnaphthalene, and the like.

[0020] These can be used individually or in combination of two or more types.

[0021] Among these, styrene is preferred as the aromatic vinyl monomer (a1) due to its excellent polymerization stability.

[0022] Other monomers (a2) are not particularly limited as long as they can polymerize with aromatic vinyl monomer (a1). Other monomers (a2) that can polymerize with aromatic vinyl monomer (a1) include, for example, (meth)acrylic acid; alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, iso-butyl (meth)acrylate; vinyl cyanide compounds such as (meth)acrylonitrile; polymerizable unsaturated fatty acids such as itaconic acid, maleic acid, fumaric acid, crotonic acid, and cinnamic acid; N-methylmaleimide, N-ethylmaleimide, N-butylmaleimide, N-octylmaleimide, N-isopropylmaleimide, N-phenylmaleimide, Np-bromophenylmaleimide, and No-chlorphenic acid. Examples include maleimides such as lumaleimide and N-cyclohexylmaleimide; unsaturated carboxylic acid anhydrides represented by maleic anhydride, itaconic anhydride, and citraconic anhydride; epoxy group-containing unsaturated compounds such as allyl glycidyl ether and glycidyl (meth)acrylate; amino group-containing unsaturated compounds such as allylamine, aminoethyl (meth)acrylate, aminopropyl (meth)acrylate, and aminostyrene; acrylamide compounds such as acrylamide and N-methylacrylamide; and hydroxyl group-containing unsaturated compounds such as 2-hydroxy-el-acrylate, 3-hydroxypropyl methacrylate, and 4-hydroxy-2-butene. These can be used individually or in combination of two or more.

[0023] Because it is versatile and inexpensive to obtain, the aromatic vinyl resin (A) is preferably polystyrene. Polystyrene includes homopolymers made of styrene, and copolymers of styrene and monomers other than styrene.

[0024] The upper limit of the mass-average molecular weight (Mw) of aromatic vinyl resin (A) in PMMA equivalent is preferably 1,000,000 or less, more preferably 500,000 or less, and even more preferably 300,000 or less. If the upper limit of Mw of aromatic vinyl resin (A) is 1,000,000 or less, the melt viscosity will be within an appropriate range, resulting in good melt-mixing properties and processability. Furthermore, the lower limit of Mw of aromatic vinyl resin (A) is preferably 10,000 or more, more preferably 50,000 or more, and even more preferably 100,000 or more. If the lower limit of Mw of aromatic vinyl resin (A) is 10,000 or more, properties such as heat resistance, hardness, scratch resistance, and weather resistance are more easily exhibited.

[0025] In a resin composition according to one aspect of the present invention, the upper limit of the aromatic vinyl resin (A) content is preferably 99% by mass or less, more preferably 95% by mass or less, and even more preferably 90% by mass or less, when the total of aromatic vinyl resin (A) and polymer (B) described later is taken as 100% by mass. If the content of aromatic vinyl resin (A) relative to 100% by mass of the total of aromatic vinyl resin (A) and polymer (B) described later is 99% by mass or less, the improvement of mechanical properties by polymer (B) will be effectively exhibited. Furthermore, the lower limit of the aromatic vinyl resin (A) content is preferably 1% by mass or more, more preferably 15% by mass or more, even more preferably 30% by mass or more, even more preferably 50% by mass or more, even more preferably 60% by mass or more, and particularly preferably 70% by mass or more, when the total of aromatic vinyl resin (A) and polymer (B) described later is taken as 100% by mass. If the content of aromatic vinyl resin (A) is 1% by mass or more relative to 100% by mass of the total of aromatic vinyl resin (A) and polymer (B) described later, the moldability will be improved and the appearance of the molded article will be excellent.

[0026] [Polymer (B)] A resin composition according to one aspect of the present invention comprises polymer (B). Polymer (B) comprises a polymer (B1) portion having a crosslinked structure and a polymer (B2) portion having a constituent unit (b2) derived from alkyl (meth)acrylate.

[0027] [constitution (B1)] In a resin composition according to one aspect of the present invention, the polymer (B1) used is preferably an acrylic rubber component from the viewpoint of excellent colorfastness, impact resistance, and weather resistance. The acrylic rubber component contains monomers containing one or more alkyl (meth)acrylates as constituent units (b1), and the monomer may contain monomers having two or more unsaturated bonds in the molecule in an amount of 20% by mass or less. In a preferred aspect of the present invention, the polymer (B1) portion has constituent units (b1) derived from alkyl (meth)acrylate. Furthermore, the monomer may contain various vinyl monomers such as aromatic alkenyl compounds such as styrene, α-methylstyrene, and vinyltoluene, vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, methacrylic acid-modified silicone, and fluorine-containing vinyl compounds in an amount of 30% by mass or less. There are no particular restrictions on the alkyl (meth)acrylates used, and examples include methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, ethoxyethoxyethyl acrylate, methoxytripropylene glycol acrylate, 4-hydroxybutyl acrylate, lauryl methacrylate, stearyl methacrylate, etc. These alkyl (meth)acrylates can be used alone or in combination of two or more.

[0028] The aforementioned "monomer having two or more unsaturated bonds in its molecule" acts as a crosslinking agent or graft crossing agent. Examples of crosslinking agents include ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,4-butylene glycol dimethacrylate, divinylbenzene, and silicones such as polyfunctional methacrylate-modified silicones. Examples of graft crossing agents include allyl methacrylate, triallyl cyanurate, and triallyl isocyanurate. Allyl methacrylate can also be used as a crosslinking agent. These crosslinking agents and graft crossing agents can be used individually or in combination of two or more.

[0029] The polymer (B1) may contain the above-mentioned acrylic rubber component alone, or it may contain two or more types. It is preferable that the polymer (B1) has a glass transition temperature of 10°C or lower. When the glass transition temperature of polymer (B1) is such that, the resulting impact strength modifier can impart greater impact resistance, which is preferable. Here, the glass transition temperature of the polymer is measured as the maximum point of Tanδ measured by a dynamic mechanical property analyzer (DMA).

[0030] The method for producing polymer (B1) is not particularly limited, but it can usually be carried out by emulsion polymerization, or forced emulsion polymerization if necessary. Here, known surfactants such as anionic, nonionic, or cationic surfactants can be used as emulsifiers and dispersion stabilizers as desired. A mixture thereof can be used as needed, but it is preferable to use a combination of emulsifiers with high micelle-forming ability and emulsifiers with low micelle-forming ability.

[0031] There are no particular restrictions on the particle size of the polymer (B1), but the median particle size measured by laser diffraction is preferably 50 to 2000 nm, more preferably 100 to 500 nm, and even more preferably 100 to 300 nm. When the particle size is 2000 nm or less, it exhibits excellent impact resistance when added to the matrix resin. When the particle size is 50 nm or more, it exhibits excellent impact resistance when added to the matrix resin.

[0032] [Polymer (B2)] The polymer (B2) contains structural units (b2) derived from alkyl (meth)acrylate. Examples of structural units (b2) derived from alkyl (meth)acrylate include methacrylic acid esters such as methyl methacrylate and 2-ethylhexyl methacrylate; and vinyl monomers such as acrylic acid esters such as methyl acrylate, ethyl acrylate, and n-butyl acrylate. These may be used alone or in combination of two or more. From the viewpoint of excellent polymerizability, it is preferable that structural units (b2) are derived from methyl methacrylate.

[0033] The polymer (B2) may contain other constituent units (b3) as needed. Examples of other constituent units (b3) include aromatic vinyl and conjugated diene monomer. There are no particular restrictions on the proportion of other constituent units (b3) to the total constituent units of the polymer (B2), but 0 to 20% by mass is preferred.

[0034] The ratio of polymer (B1) to polymer (B2) in polymer (B) is such that polymer (B1) accounts for 70 to 95% by mass of the total of polymer (B1) and polymer (B2) portions (100% by mass), preferably polymer (B1) accounts for 75 to 90% by mass. When polymer (B1) accounts for 95% by mass or less, the resulting polymer (B) tends to have excellent dispersibility in the resin. On the other hand, when it is 70% by mass or more, it tends to have excellent discoloration resistance and impact resistance.

[0035] Polymer (B) may be a core-shell polymer in which polymer (B1) is the core and polymer (B2) is the shell, or it may be a core-shell polymer in which polymer (B2) is the core and polymer (B1) is the shell. It is preferable that polymer (B) is a core-shell polymer in which polymer (B1) is the core and polymer (B2) is the shell, as this provides improved impact resistance.

[0036] Polymer (B) is obtained by adding constituent units (b2) derived from alkyl (meth)acrylate to the latex of polymer (B1) and polymerizing it in one or multiple steps by radical polymerization. Polymer (B) is obtained as particles by immersing this graft copolymer latex in hot water containing an acid such as sulfuric acid or hydrochloric acid, or a metal salt such as calcium chloride, calcium acetate, or magnesium sulfate, to salt out, solidify, separate, and recover. At this time, salts such as sodium carbonate or sodium sulfate may also be used in combination. It can also be obtained by direct drying methods such as spray drying.

[0037] In a resin composition according to one aspect of the present invention, the upper limit of the polymer (B) content is preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less, when the total of the aromatic vinyl resin (A) and the polymer (B) described later is 100% by mass. If the polymer (B) content is 50% by mass or less relative to 100% by mass of the total of the aromatic vinyl resin (A) and the polymer (B) described later, moldability is improved and the appearance of the molded article is excellent. Furthermore, the lower limit of the polymer (B) content is preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more, when the total of the aromatic vinyl resin (A) and the polymer (B) described later is 100% by mass. If the polymer (B) content is 1% by mass or more relative to 100% by mass of the total of the aromatic vinyl resin (A) and the polymer (B) described later, the improvement of mechanical properties by polymer (B) is effectively exhibited.

[0038] [Polymer (C)] The polymer (C) is preferably a copolymer, and more preferably at least one copolymer from among block copolymers, graft copolymers, and random copolymers.

[0039] When polymer (C) is a block copolymer and / or graft copolymer, the block and / or graft structure of polymer (C) may be any of the following: diblock, triblock, multiblock, graft, cyclic, star-shaped, comb-shaped, dendritic, ladder-shaped, etc., and may also be a combination of multiple such structures. Among these structures, it is preferable to include at least one of diblock, triblock, or graft structures because they can provide excellent impact resistance and flexibility and are relatively easy to manufacture.

[0040] Polymer (C) may contain constituent units derived from the following general formula (1) and / or general formula (2).

[0041] [ka]

[0042] In formula (1), V 1 ~V 4 are each independently a hydrogen atom, an alkyl group, a vinyl group, an aryl group or a heterocyclic group.

[0043]

Chemical formula

[0044] In formula (2), W 1 and W 2 are each independently a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group. Y represents an ester bond, an amide bond, a carbonyl bond or an ether bond.

[0045] Examples of the monomer that satisfies the conditions of general formula (1) include ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, decene, butadiene, butylene, styrene and the like.

[0046] Examples of the monomer that satisfies the conditions of general formula (2) include the following. a) (Meth)acrylate ester monomers other than methyl methacrylate, such as methyl acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, i-propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-lauryl (meth)acrylate, n-stearyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, phenoxyethyl (meth)acrylate. b) Hydroxyl group-containing (meth)acrylate monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and glycerol (meth)acrylate. c) Carboxyl group-containing vinyl monomers such as (meth)acrylic acid, 2-(meth)acryloyloxyethylhexahydrophthalic acid, 2-(meth)acryloyloxypropylhexahydrophthalic acid, 2-(meth)acryloyloxyethyl phthalic acid, 2-(meth)acryloyloxypropyl phthalic acid, 2-(meth)acryloyloxyethyl maleic acid, 2-(meth)acryloyloxypropyl maleic acid, 2-(meth)acryloyloxyethyl succinic acid, 2-(meth)acryloyloxypropyl succinic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, monomethyl maleate, monomethyl itaconic acid, etc. d) Vinyl monomers containing acid anhydride groups such as maleic anhydride and itaconic anhydride. e) Epoxy group-containing vinyl monomers such as glycyl(meth)acrylate, glycyl α-ethyl acrylate, and 3,4-epoxybutyl(meth)acrylate. f) Vinyl monomers containing amino groups, such as dimethylaminoethyl (meth)acrylate and diethylaminoethyl (meth)acrylate. g) Vinyl monomers containing amide groups such as (meth)acrylamide, Nt-butyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, diacetone acrylamide, maleic acid amide, and maleimide. h) Vinyl monomers such as styrene, α-methylstyrene, vinyltoluene, (meth)acrylonitrile, vinyl chloride, vinyl acetate, and vinyl propionate. i) Polyfunctional vinyl monomers such as divinylbenzene, ethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, allyl(meth)acrylate, and N,N'-methylenebis(meth)acrylamide.

[0047] When polymer (C) is a block copolymer and / or a graft copolymer, polymer (C) may contain polymer (C1) and polymer (C2) portions as described below within the polymer molecule, and it is preferable that it contains polymer (C1) and polymer (C2) portions. In this case, for example, polymer (C) may be a graft copolymer in which the main chain is composed of polymer (C1) portions, and graft chains composed of polymer (C2) portions branch and connect to the main chain composed of polymer (C1) portions. Conversely, the main chain may be polymer (C2) portions and the side chains may be polymer (C1) portions. Polymer (C) may also be a block copolymer in which polymers composed of polymer (C1) portions and polymers composed of polymer (C2) portions are linked in series. Furthermore, the main chain and / or side chains of the graft copolymer may contain block copolymers.

[0048] If polymer (C) is a block copolymer and / or a graft copolymer, the polymer (C1) portion of polymer (C) has the function of imparting miscibility or compatibility to polymer (C) with polymer (B) and the function of making polymer (C) handleable as a solid. The polymer (C2) portion of polymer (C) has the function of imparting miscibility or compatibility to polymer (C) with aromatic vinyl resin (A) and the function of imparting flexibility, impact resistance, moldability, etc.

[0049] The lower limit of the mass-average molecular weight (Mw) of polymer (C) in PMMA equivalent is preferably 100,000 or more, more preferably 200,000 or more, and particularly preferably 300,000 or more. If the lower limit of Mw of polymer (C) is 100,000 or more, the properties of polymer (C) such as heat resistance, hardness, scratch resistance, weather resistance, and transparency are more easily exhibited. Furthermore, the upper limit of the mass-average molecular weight (Mw) of polymer (C) in PMMA equivalent is preferably 5,000,000 or less, more preferably 4,000,000 or less, and particularly preferably 3,000,000 or less. If the upper limit of Mw of polymer (C) is 5,000,000 or less, the melt viscosity will be within an appropriate range, resulting in better melt-mixing properties and processability.

[0050] [conversely (C1)] The polymer (C1) preferably contains 50% to 100% by mass of repeating units derived from methyl methacrylate (hereinafter sometimes referred to as "methyl methacrylate units") based on 100% by mass of the total weight of the polymer (C1).

[0051] The polymer (C1) more preferably contains 80% by mass or more of methyl methacrylate units, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more, based on 100% by mass of its total weight.

[0052] If the lower limit of the methyl methacrylate unit content of polymer (C1) is 50% by mass or more relative to 100% by mass of the total weight of polymer (C1), polymer (C1) will have good affinity for polymer (B) and good miscibility or compatibility. On the other hand, the upper limit of the methyl methacrylate unit content is not particularly limited as long as it is 100% by mass or less, and polymer (C1) may be a homopolymer with 100% by mass of methyl methacrylate units.

[0053] The polymer (C1) may contain, in addition to methyl methacrylate units, units derived from other comonomers copolymerizable with methyl methacrylate (hereinafter sometimes referred to as "comonomer units"), depending on the purpose.

[0054] For example, if the polymer (C1) contains acrylate units as comonomer units, the depolymerization of the polymer (C1) when exposed to high-temperature conditions such as melt molding can be suppressed, thereby improving its resistance to thermal decomposition.

[0055] Furthermore, by adjusting the type or content of comonomer units, the functions of the polymer (C1), such as glass transition temperature (Tg), processability, heat resistance, refractive index, weather resistance, mold release properties, and thermal decomposition resistance, can be controlled.

[0056] The upper limit of the comonomer unit content in the polymer (C1) is preferably 50% by mass or less relative to 100% by mass of the total mass of the polymer (C1), in order to maintain good performance in terms of heat resistance, hardness, scratch resistance, weather resistance, transparency, processability, etc. On the other hand, the lower limit of the comonomer unit content may be 0% by mass.

[0057] Examples of comonomers that form the comonomer unit of polymer (C1) include the following a) to i). a) (meth)acrylate ester monomers other than methyl methacrylate, such as methyl acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, i-propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-lauryl (meth)acrylate, n-stearyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, phenoxyethyl (meth)acrylate, and phenoxyethyl (meth)acrylate. b) Hydroxyl group-containing (meth)acrylate monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and glycerol (meth)acrylate. c) Carboxyl group-containing vinyl monomers such as (meth)acrylic acid, 2-(meth)acryloyloxyethylhexahydrophthalic acid, 2-(meth)acryloyloxypropylhexahydrophthalic acid, 2-(meth)acryloyloxyethyl phthalic acid, 2-(meth)acryloyloxypropyl phthalic acid, 2-(meth)acryloyloxyethyl maleic acid, 2-(meth)acryloyloxypropyl maleic acid, 2-(meth)acryloyloxyethyl succinic acid, 2-(meth)acryloyloxypropyl succinic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, monomethyl maleate, monomethyl itaconic acid, etc. d) Vinyl monomers containing acid anhydride groups such as maleic anhydride and itaconic anhydride. e) Epoxy group-containing vinyl monomers such as glycyl(meth)acrylate, glycyl α-ethyl acrylate, and 3,4-epoxybutyl(meth)acrylate. f) Vinyl monomers containing amino groups, such as dimethylaminoethyl (meth)acrylate and diethylaminoethyl (meth)acrylate. g) Vinyl monomers containing amide groups such as (meth)acrylamide, Nt-butyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, diacetone acrylamide, maleic acid amide, and maleimide. h) Vinyl monomers such as styrene, α-methylstyrene, vinyltoluene, (meth)acrylonitrile, vinyl chloride, vinyl acetate, and vinyl propionate. i) Polyfunctional vinyl monomers such as divinylbenzene, ethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, allyl(meth)acrylate, and N,N'-methylenebis(meth)acrylamide.

[0058] These can be used individually or in combination of two or more types.

[0059] Among these, methyl acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate are preferred in terms of the availability of monomers, with methyl acrylate being more preferred.

[0060] Furthermore, the polymer (C1) preferably contains constituent units derived from the macromonomer (c1) represented by the following general formula (3). In this case, the methyl methacrylate unit may be contained in the macromonomer (c1).

[0061] [ka]

[0062] (In formula (3), R 0 ~R n Each of these is independently a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group. 1 ~X n (Each of these is either a hydrogen atom or a methyl group. Z is a terminal group. n is a natural number between 1 and 10,000.)

[0063] Because the polymer (C1) contains structural units derived from macromonomers (c1), the molded article obtained from the resin composition according to one aspect of the present invention exhibits less reduction in impact resistance under humid and hot conditions and superior long-term properties.

[0064] <R 0 ~R n > In equation (3) above, R 0 ~R n The alkyl group, cycloalkyl group, aryl group, or heterocyclic group may have substituents.

[0065] R 0 ~R nExamples of alkyl groups include branched or linear alkyl groups having 1 to 20 carbon atoms. Specific examples include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, and eicosyl group. Among these, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, t-butyl group, pentyl group, hexyl group, heptyl group, and octyl group are preferred due to their availability, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, and t-butyl group are more preferred, and the methyl group is particularly preferred.

[0066] R 0 ~R n Examples of cycloalkyl groups include cycloalkyl groups having 3 to 20 carbon atoms. Specific examples include cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, t-butylcyclohexyl group, isobornyl group, adamantyl group, etc. Due to their availability, cyclopropyl group, cyclobutyl group, and adamantyl group are preferred.

[0067] R 0 ~R n Examples of aryl groups include aryl groups having 6 to 18 carbon atoms. Specific examples include phenyl groups, benzyl groups, and naphthyl groups.

[0068] R 0 ~R n Examples of heterocyclic groups include heterocyclic groups with 5 to 18 carbon atoms. Specific examples include γ-lactone groups, ε-caprolactone groups, and morpholine groups. Heteroatoms included in the heterocycle include oxygen atoms, nitrogen atoms, and sulfur atoms.

[0069] R 0 ~Rn The substituents can be independently selected from the group consisting of alkyl groups, aryl groups, carboxyl groups, alkoxycarbonyl groups (-COOR'), carbamoyl groups (-CONR'R''), cyano groups, hydroxyl groups, amino groups, amide groups (-NR'R''), halogen atoms, allyl groups, epoxy groups, alkoxy groups (-OR'), and hydrophilic or ionic groups. Examples of R' or R'' are independently selected from the group consisting of R 0 ~R n Similar groups (excluding heterocyclic groups) can be cited.

[0070] R 0 ~R n An example of an alkoxycarbonyl group as a substituent is a methoxycarbonyl group.

[0071] R 0 ~R n Examples of carbamoyl groups used as substituents include the N-methylcarbamoyl group and the N,N-dimethylcarbamoyl group.

[0072] R 0 ~R n An example of an amide group as a substituent is the dimethylamide group.

[0073] R 0 ~R n Examples of halogen atoms used as substituents include fluorine, chlorine, bromine, and iodine atoms.

[0074] R 0 ~R n Examples of alkoxy groups used as substituents include alkoxy groups having 1 to 12 carbon atoms. A specific example is the methoxy group.

[0075] R 0 ~R nExamples of hydrophilic or ionic substituents include alkali salts of carboxyl groups or sulfoxyl groups, poly(alkylene oxide) groups such as polyethylene oxide groups and polypropylene oxide groups, and cationic substituents such as quaternary ammonium bases.

[0076] R 0 ~R n The alkyl group is preferably at least one selected from alkyl groups and cycloalkyl groups, with alkyl groups being more preferred. The alkyl group is preferably a methyl group, an ethyl group, an n-propyl group, or an i-propyl group, with a methyl group being more preferred from the viewpoint of availability.

[0077] <X 1 ~X n > In equation (3) above, X 1 ~X n From the perspective of the ease of synthesis of macromonomer (c1), X 1 ~X n It is preferable that 80 mol% or more of the total moles are methyl groups.

[0078] <z> In formula (3) above, Z is a terminal group of the macromonomer (c1). Examples of terminal groups of the macromonomer (c1) include groups derived from hydrogen atoms and radical polymerization initiators, similar to the terminal groups of polymers obtained by known radical polymerization.

[0079] The lower limit of the methyl methacrylate unit content in the macromonomer (c1) is not particularly limited, but a content of 50% by mass or more relative to 100% by mass of the total mass of the macromonomer (c1) is advantageous for improving discoloration resistance, impact resistance, and transparency. The lower limit of the methyl methacrylate unit content is preferably 50% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more. On the other hand, the upper limit of the methyl methacrylate unit content is not particularly limited, and may be 100% by mass of methyl methacrylate units, or it may be 99% by mass or less relative to 100% by mass of the total mass of the macromonomer (c1).

[0080] The mass-average molecular weight (Mw) of the polymer (C1) in terms of PMMA is preferably 5,000 to 100,000, more preferably 10,000 to 70,000, and even more preferably 15,000 to 50,000. If the lower limit of the Mw of the polymer (C1) is 5,000 or more, the properties of the polymer (C), such as heat resistance, hardness, scratch resistance, weather resistance, and transparency, are more easily exhibited. Furthermore, if the upper limit of the Mw of the polymer (C1) is 100,000 or less, the melt viscosity will be within an appropriate range, resulting in better melt-mixing properties and processability.

[0081] Polymer (C1) may be a mixture of two or more polymers. In this case, the mass-average molecular weight Mw is calculated as the value for the entire polymer (C1). When multiple types of polymers (C1) with different mass-average molecular weights (Mw) are used in combination, the polymer (C1) with the lower molecular weight plays a role in reducing syrup viscosity and preventing crosslinking of the copolymer, while the polymer (C1) with the higher molecular weight plays a role in ensuring compatibility with polymer (B) when used as an additive.

[0082] When polymer (C) is a block copolymer and / or a graft copolymer, the lower limit of the content of polymer (C1) contained in polymer (C) is preferably 5% by mass or more, more preferably 10% by mass or more, and particularly preferably 15% by mass or more, based on 100% by mass of the total weight of polymer (C). If the lower limit of the content of polymer (C1) is 10% by mass or more, it becomes easier to obtain polymer (C) with excellent miscibility or compatibility with polymer (B). Furthermore, when polymer (C) is a block copolymer and / or a graft copolymer, the upper limit of the content of polymer (C1) contained in polymer (C) is preferably 75% by mass or less, more preferably 70% by mass or less, and particularly preferably 65% ​​by mass or less, based on 100% by mass of the total weight of polymer (C). If the upper limit of the polymer (C1) content is 75% by mass or less, the effect of imparting flexibility by polymer (C) is easily obtained, and polymer (C) with excellent miscibility or compatibility with aromatic vinyl resin (A) is also easily obtained.

[0083] [mix(C2)] Polymer (C2) has the function of imparting miscibility or compatibility with aromatic vinyl resin (A) to polymer (C), and the function of imparting flexibility, impact resistance, moldability, etc.

[0084] The glass transition temperature (Tg) of the polymer (C2) is preferably 0°C or lower, more preferably -10°C or lower, even more preferably -20°C or lower, and particularly preferably -35°C or lower. A glass transition temperature (Tg) of 0°C or lower for the polymer (C2) can impart flexibility or impact resistance, and is expected to improve fluidity during melt molding, among other effects.

[0085] The Tg of polymer (C2) can be calculated using Fox's formula, employing the values ​​listed in known literature such as the Polymer Handbook (POLYMER HANDBOOK FOURTH EDITION 2003) as the Tg of the monomer homopolymer, which is the constituent unit of polymer (C2). Alternatively, the dynamic viscoelasticity of the obtained molded article can be measured, and the value of tanδ can be adopted as the Tg.

[0086] When polymer (C) is a block copolymer and / or a graft copolymer, the upper limit of the content of polymer (C2) contained in polymer (C) is preferably 95% by mass or less, more preferably 90% by mass or less, and particularly preferably 85% by mass or less, based on 100% by mass of the total weight of polymer (C). If the content of polymer (C2) is 95% by mass or less, it has the function of making polymer (C) handleable as a solid. When polymer (C) is a block copolymer and / or a graft copolymer, the lower limit of the content of polymer (C2) contained in polymer (C) is preferably 25% by mass or more, more preferably 30% by mass or more, and particularly preferably 35% by mass or more, based on 100% by mass of the total weight of polymer (C). If the content of polymer (C2) is 25% by mass or more, the effect of imparting flexibility by polymer (C) is easily obtained, and polymer (C) with excellent miscibility or compatibility with aromatic vinyl resin (A) is easily obtained.

[0087] The polymer (C2) may contain aromatic vinyl monomer (c2) units. It may also optionally contain other monomers (c3) that can polymerize with the aromatic vinyl monomer (c2).

[0088] Examples of aromatic vinyl monomers (c2) include vinyl benzoate, vinyl cinnamate, vinyl 2-chlorobenzoate, vinyl 4-butylbenzoate, chloro(methyl)(phenyl)(vinyl)silane, 1,3-dimethyl-1,3-diphenyl-1,3-divinyldisiloxane, 9-vinylcarbazole, N-vinylphthalimide, 1,3-butadiene-2-ylbenzene, styrene, benzyl acrylate, α-methylstyrene, o-methylstyrene, p-methylstyrene, o-ethylstyrene, p-ethylstyrene and pt-butylstyrene, vinylethylbenzene, vinyltoluene, vinylxylene, vinylnaphthalene, diphenylethylene, and divinylbenzene.

[0089] These can be used individually or in combination of two or more types.

[0090] Among these, styrene and benzyl acrylate are preferred because they are versatile and readily available at low cost.

[0091] The presence of other monomers (c3) can improve the impact resistance of the resulting molded article, so it is preferable that the glass transition temperature (Tg) of the acrylate homopolymer be 0°C or lower. The Tg of the acrylate homopolymer can be calculated using Fox's formula, employing values ​​from known literature such as the Polymer Handbook (POLYMER HANDBOOK FOURTH EDITION 2003).

[0092] Other monomers used for the monomer (C3) include, for example, acrylates such as methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, i-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, n-lauryl acrylate, n-stearyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, phenoxyethyl acrylate, etc.; hydroxyl group-containing acrylates such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, glycerol acrylate, etc.; 2-acryloyloxyethylhexahydrophthalic acid, 2-acryloyloxypropylhexahydrophthalic acid, 2-acryloyloxyethyl phthalic acid, 2-A Examples include carboxyl group-containing acrylates such as cryoyloxypropylphthalic acid, 2-acryloyloxyethyl maleic acid, 2-acryloyloxypropyl maleic acid, 2-acryloyloxyethyl succinic acid, and 2-acryloyloxypropyl succinic acid; epoxy group-containing acrylates such as glycyl acrylate, glycyl α-ethyl acrylate, and 3,4-epoxybutyl acrylate; amino group-containing acrylates such as dimethylaminoethyl acrylate and diethylaminoethyl acrylate; and polyfunctional acrylates such as ethylene glycol diacrylate, 1,3-butylene glycol diacrylate, 1,6-hexanediol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, allyl acrylate, and N,N'-methylenebisacrylamide. These can be used individually or in combination of two or more types.

[0093] Among the monomers mentioned above, since the Tg of the homopolymer of the monomer is 0°C or lower, the other monomers (c3) that are preferred are 2-ethylhexyl acrylate, 4-hydroxybutyl acrylate, n-butyl acrylate, n-propyl acrylate, ethyl acrylate, and 2-hydroxyethyl acrylate. Furthermore, methyl acrylate, ethyl acrylate, and n-butyl acrylate are preferred because they are readily available.

[0094] In terms of further improving impact resistance, when polymer (C) is a random copolymer, polymer (C) preferably contains at least one of the following constituent units: a constituent unit derived from a (meth)acrylate monomer (c4), a constituent unit derived from a monomer (c5) having a glass transition temperature of 0°C or less, and a constituent unit derived from an aromatic vinyl monomer (c6). It is more preferably that it contains at least two such constituent units, and even more preferably that it contains all of monomer (c4), monomer (c5), and monomer (c6).

[0095] Examples of (meth)acrylate monomers (c4) include the following a) to i). a) (meth)acrylate ester monomers other than methyl methacrylate, such as methyl acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, i-propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-lauryl (meth)acrylate, n-stearyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, phenoxyethyl (meth)acrylate, and phenoxyethyl (meth)acrylate. b) Hydroxyl group-containing (meth)acrylate monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and glycerol (meth)acrylate. c) Carboxyl group-containing vinyl monomers such as (meth)acrylic acid, 2-(meth)acryloyloxyethylhexahydrophthalic acid, 2-(meth)acryloyloxypropylhexahydrophthalic acid, 2-(meth)acryloyloxyethyl phthalic acid, 2-(meth)acryloyloxypropyl phthalic acid, 2-(meth)acryloyloxyethyl maleic acid, 2-(meth)acryloyloxypropyl maleic acid, 2-(meth)acryloyloxyethyl succinic acid, 2-(meth)acryloyloxypropyl succinic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, monomethyl maleate, monomethyl itaconic acid, etc. d) Vinyl monomers containing acid anhydride groups such as maleic anhydride and itaconic anhydride. e) Epoxy group-containing vinyl monomers such as glycyl(meth)acrylate, glycyl α-ethyl acrylate, and 3,4-epoxybutyl(meth)acrylate. f) Vinyl monomers containing amino groups, such as dimethylaminoethyl (meth)acrylate and diethylaminoethyl (meth)acrylate. g) Vinyl monomers containing amide groups such as (meth)acrylamide, Nt-butyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, diacetone acrylamide, maleic acid amide, and maleimide. h) Vinyl monomers such as styrene, α-methylstyrene, vinyltoluene, (meth)acrylonitrile, vinyl chloride, vinyl acetate, and vinyl propionate. i) Polyfunctional vinyl monomers such as divinylbenzene, ethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, allyl(meth)acrylate, and N,N'-methylenebis(meth)acrylamide.

[0096] These can be used individually or in combination of two or more types.

[0097] Among these, in terms of the availability of monomers, methyl acrylate, ethyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate are preferred as the (meth)acrylate monomer (c4), with methyl acrylate being more preferred.

[0098] Preferred monomers (C5) with a glass transition temperature of 0°C or lower include 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, phenyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, nonyl acrylate, lauryl acrylate, tridecyl acrylate, and 2-ethylhexyl acrylate. Furthermore, ethyl acrylate and butyl acrylate are preferred due to their availability.

[0099] Examples of aromatic vinyl monomers (C6) include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, o-ethylstyrene, p-ethylstyrene, and pt-butylstyrene, vinylethylbenzene, vinyltoluene, vinylxylene, vinylnaphthalene, diphenylethylene, and divinylbenzene. Among these, styrene is preferred from the viewpoint of practical properties and productivity. These can be used alone or in combination of two or more.

[0100] When polymer (C) is a random copolymer, the lower limit of constituent units derived from (meth)acrylate contained in polymer (C) is preferably 1% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more, when the total amount of constituent units of polymer (C) is 100% by mass. It is preferable that polymer (C) can be treated as a solid if the lower limit of constituent units derived from (meth)acrylate contained in polymer (C) is 1% by mass or more.

[0101] Furthermore, if polymer (C) is a random copolymer, the upper limit of constituent units derived from (meth)acrylate contained in polymer (C) is preferably 50% by mass or less, more preferably 47% by mass or less, and even more preferably 45% by mass or less, when the total amount of constituent units of polymer (C) is 100% by mass. If the upper limit of constituent units derived from (meth)acrylate contained in polymer (C) is 50% by mass or less, the effect of imparting flexibility by polymer (C) is easily obtained, and polymer (C) with excellent miscibility or compatibility with aromatic vinyl resin (A) is easily obtained.

[0102] When polymer (C) is a random copolymer, the lower limit of constituent units derived from monomers with a glass transition temperature of 0°C or lower contained in polymer (C) is preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more, when the total amount of constituent units of polymer (C) is 100% by mass. It is preferable that the lower limit of constituent units derived from monomers with a glass transition temperature of 0°C or lower contained in polymer (C) is 1% by mass or more, because it makes it easier to obtain the effect of imparting flexibility by polymer (C). Furthermore, if the polymer (C) is a random copolymer, the upper limit of constituent units derived from monomers with a glass transition temperature of 0°C or lower contained in the polymer (C) is preferably 50% by mass or less, more preferably 47% by mass or less, and even more preferably 45% by mass or less, when the total amount of constituent units of the polymer (C) is 100% by mass. It is preferable that the polymer (C) can be treated as a solid if the upper limit of constituent units derived from monomers with a glass transition temperature of 0°C or lower contained in the polymer (C) is 50% by mass or less.

[0103] When polymer (C) is a random copolymer, the lower limit of constituent units derived from aromatic vinyl monomers contained in polymer (C) is preferably 5% by mass or more, more preferably 15% by mass or more, and even more preferably 30% by mass or more, when the total amount of constituent units of polymer (C) is taken as 100% by mass. It is preferable that the lower limit of constituent units derived from aromatic vinyl monomers contained in polymer (C) is 5% by mass or more, as this results in good miscibility or compatibility between polymer (C) and aromatic vinyl resin (A), and improves the mechanical properties of polymer (C).

[0104] Furthermore, if polymer (C) is a random copolymer, the upper limit of constituent units derived from aromatic vinyl monomers contained in polymer (C) is preferably 70% by mass or less, more preferably 60% by mass or less, and even more preferably 50% by mass or less, when the total amount of constituent units of polymer (C) is taken as 100% by mass. It is preferable that the upper limit of constituent units derived from vinyl monomers contained in polymer (C) is 70% by mass or less, as this results in excellent miscibility between polymer (C) and polymer (B) and allows polymer (B) to effectively exhibit its functions.

[0105] The polymer (C) may be a hydrogenated styrene-diene block copolymer. Preferably, the hydrogenated styrene-diene block copolymer used as polymer (C) contains 5% to 50% by mass of monomer units derived from styrene, based on 100% by mass of polymer (C). Specifically, examples include hydrogenated styrene-diene block copolymers (SEBS) or hydrogenated styrene-isoprene block copolymers (SEPS), which are obtained by hydrogenating a styrene-diene block copolymer, obtained by copolymerizing a diene such as isoprene or butadiene with styrene, using a known method. Because polymer (C) is a hydrogenated styrene-diene block copolymer, the molded article obtained from the resin composition according to one aspect of the present invention exhibits excellent discoloration resistance in a humid and hot environment, less reduction in impact resistance, and superior long-term properties.

[0106] In a resin composition according to one aspect of the present invention, the upper limit of the polymer (C) content is preferably 500 parts by mass or less, more preferably 300 parts by mass or less, even more preferably 200 parts by mass or less, even more preferably 30 parts by mass or less, even more preferably 25 parts by mass or less, and particularly preferably 20 parts by mass or less, when the total of aromatic vinyl resin (A) and polymer (B) is 100 parts by mass. If the polymer (C) content is 500 parts by mass or less per 100 parts by mass of the total of aromatic vinyl resin (A) and polymer (B), the rigidity of the resin composition according to one aspect of the present invention is improved. Furthermore, the lower limit of the polymer (C) content is preferably 1 part by mass or more, more preferably 5 parts by mass or more, and even more preferably 10 parts by mass or more, when the total of aromatic vinyl resin (A) and polymer (B) is 100 parts by mass. If the content of polymer (C) is 1 part by mass or more per 100 parts by mass of the total of aromatic vinyl resin (A) and polymer (B), the effect of imparting flexibility by polymer (C) is easily obtained, and the effect of easily dispersing polymer (B) in aromatic vinyl resin (A) is also easily obtained.

[0107] [Molding material] A molding material according to one aspect of the present invention includes the resin composition. The molding material may also be a molding material comprising the resin composition.

[0108] [Method for manufacturing molding materials] The method for producing a molding material according to one aspect of the present invention is not particularly limited, and a commonly used resin mixing method or melt-kneading method can be applied. For example, a resin composition is produced by mixing and / or kneading an aromatic vinyl resin (A), a polymer (B), and a polymer (C) with a matrix resin that may be added as needed.

[0109] Alternatively, an aromatic vinyl resin (A), polymer (B), and polymer (C) may be pre-mixed and kneaded to form a masterbatch, and the resulting masterbatch may be further mixed and / or kneaded with a matrix resin to produce a resin composition.

[0110] Examples of resin mixing and / or melt-kneading methods include using a Henschel mixer, Banbury mixer, V-type mixer, ribbon blender, planetary mixer, super mixer, tumbler, single-screw extruder, twin-screw extruder, multi-screw extruder, cone kneader, planetary gear extruder, plasticator, roll kneader, etc. These manufacturing methods can be combined as appropriate. The resulting molding material is preferably in the form of pellets or beads.

[0111] [Packaging methods for molding materials] A molding material according to one aspect of the present invention can employ various packaging methods to prevent contamination or adsorption of foreign matter, or absorption of unnecessary gases. For example, various clean packaging methods can be used to prevent contamination of foreign matter. Various coatings can be applied to the packaging material to provide gas barrier properties.

[0112] [Molded body] A molded article according to one aspect of the present invention is formed by molding the molding material. Examples of shapes for a molded article according to one aspect of the present invention include sheets, films, tubes, and three-dimensional shapes. Furthermore, the surface of the molded article may be mirror-finished, or surface texture such as texture or matte finish may be applied to both sides or one side. In addition, a protective film or separator may be installed on the surface of the molded article. Furthermore, various powders may be attached to the surface for the purpose of improving blocking resistance.

[0113] A molded article according to one aspect of the present invention has excellent physical properties such as impact resistance. This molded article may be applied to packaging materials, food containers, building materials, miscellaneous goods such as toys and stationery, automobile parts, office automation equipment, home appliances, etc.

[0114] A molded article according to one aspect of the present invention exhibits excellent long-term properties. The ΔYI (change in yellowness) of the molded article, as measured by the following ΔYI (change in yellowness) measurement method, is preferably 3.0 or less, more preferably 2.0 or less, even more preferably 0.1 or less, and still more preferably 0.05 or less. <Method for measuring ΔYI> A molded specimen of type B2, conforming to JIS K 7139:2009, is annealed at 65°C for 24 hours in an environment of 65°C and 65% humidity. The molded specimen is then exposed to a humid heat environment for 146 hours in a constant temperature and humidity chamber at 65°C and 65% humidity. The yellowness of the molded specimen before and after 146 hours of humid heat exposure is measured using a spectrophotometer in accordance with JIS K 7373. ΔYI is calculated using the following formula. ΔYI = (Yellowness of the molded body after 146 hours of exposure to a humid heat environment) - (Yellowness of the molded body before exposure to a humid heat environment)

[0115] Furthermore, the load deflection temperature of the molded body, as measured by the following load deflection temperature measurement method, is preferably 89.6°C or higher, more preferably 89.8°C or higher, and even more preferably 90.0°C or higher. <Method for measuring load deflection temperature> A molded specimen, a Type B2 test piece conforming to JIS K 7139:2009, is annealed at 65°C for 24 hours in an environment of 65°C and 65% humidity. The molded specimen is then exposed to a humid heat environment for 146 hours in a constant temperature and humidity chamber at 65°C and 65% humidity. After exposure to the humid heat environment, the load deflection temperature of the molded specimen is measured using an HDT tester in accordance with JIS K 7191-1:2015.

[0116] A preferred molded article according to one aspect of the present invention is one in which ΔYI measured by the ΔYI measurement method is 3.0 or less, 2.0 or less, 0.1 or less, or 0.05 or less; and the load deflection temperature measured by the load deflection temperature measurement method is 89.6°C or higher, 89.8°C or higher, or 90.0°C or higher.

[0117] [Method for manufacturing molded products] A preferred method for producing a molded article according to one aspect of the present invention by molding the aforementioned molding material is a melt molding method, and examples include injection molding, compression molding, hollow molding, extrusion molding, rotational molding, casting, and solvent casting. Of these, injection molding or extrusion molding is preferred in terms of productivity. The mold used for shaping, resin temperature, molding conditions, etc., when molding using the aforementioned molding machine are not particularly limited.

[0118] When manufacturing a molded product, it is preferable to pre-dry the molding material at an appropriate temperature and time to ensure that the moisture content of the molding material is within an appropriate range, as is done when manufacturing the molding material itself. By appropriately adjusting the temperature and time within a certain range, defects such as foaming and / or appearance defects that occur during melt molding can be suppressed, as well as thermal degradation of the molding material, thereby suppressing the deterioration of the physical properties and / or discoloration of the molded product.

[0119] [Processing using molded products] A molded article according to one aspect of the present invention can be bonded and / or welded to other parts, or used to manufacture various products by bonding and / or fusing sheets, films, or tubes together. Methods for welding a molded article according to one aspect of the present invention using a molding material according to one aspect of the present invention include ultrasonic welding, vibration welding, high-frequency welding, hot plate welding, laser welding, and spin welding. Various adhesives such as epoxy resins, vinyl acetates, acrylic resins, phenolic resins, chloroprene rubbers, nitrile rubbers, silicone rubbers, styrene-butadiene rubbers, and cyanoacrylates can be appropriately selected and used as bonding methods for the molded article. Solvent bonding can also be applied. Furthermore, tape bonding, such as tape application or double-sided tape, is possible. When bonding dissimilar materials, multiple bonding methods can be combined depending on the materials being bonded. [Examples]

[0120] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples. In the following, "parts" means "parts by mass".

[0121] The evaluations in the examples and comparative examples were carried out by the following method.

[0122] (Measurement of mass-average molecular weight (Mw)) The mass-average molecular weight (Mw) of polymers (C) obtained in the examples and comparative examples was measured using gel permeation chromatography (GPC). 10 mg of the obtained copolymer was dissolved in 10 mL of tetrahydrofuran, and the solution, filtered through a 0.45 μm filter, was used as the sample for GPC measurement. For GPC measurement of the copolymer, a high-performance liquid chromatography analyzer (Tosoh Corporation, model name: HLC-8320) was used, with a polymer measurement guard column (Tosoh Corporation, product name: TSK-GUARD COLUMN SUPER HH) and one ultrapolymer measurement column (Tosoh Corporation, product name: TSK-GEL GMHHR-H) connected in series.

[0123] Furthermore, a differential refractometer (RI) was used as the detector for GPC. Measurements were performed under the following conditions: separation column temperature: 40°C, mobile phase: tetrahydrofuran, mobile phase flow rate: 0.6 mL / min, sample injection volume: 10 μL. Several types of polymethyl methacrylates with known molecular weights were used. Using polymers from Laboratories (peak molecular weight (Mp) 1,560 to 19,500,000) as standard polymers, a calibration curve was created, and the mass-average molecular weight (Mw), which is the relative molecular weight in terms of polymethyl methacrylate, was determined.

[0124] (Evaluation of impact resistance) The Charpy impact strength was measured at 23°C for Type B2 test specimens in accordance with JIS K 7139:2009. Additionally, annealing was performed at 65°C for 24 hours, and the Charpy impact strength was measured at 23°C in accordance with JIS K 7111:2012.

[0125] (Heat and moisture test and impact resistance evaluation) In accordance with JIS K 7139:2009, Type B2 test specimens were annealed at 65°C for 24 hours. The molded bodies were then subjected to a humid heat environment for 146 hours using a constant temperature and humidity chamber (ESPEC Corporation, Platinum J series constant temperature and humidity chamber, model: PR-1J) at 65°C and 65% humidity. After the humid heat test, the Charpy impact strength of the pre- and post-test specimens was measured at 23°C in accordance with JIS K 7111:2012.

[0126] (Moist heat test and load deflection temperature) In accordance with JIS K 7139:2009, Type B2 test specimens were annealed at 65°C for 24 hours, and then the molded bodies were exposed to a moist heat environment for 146 hours in a constant temperature and humidity chamber (ESPEC Corporation, Platinum J series constant temperature and humidity chamber, model: PR-1J) at a temperature of 65°C and a humidity of 65%. After the moist heat test, the load deflection temperature of the test specimens before and after the test was measured using an HDT tester (Yasuda Seiki Co., Ltd., No. 148-HD-6 heat distortion tester) in accordance with JIS K 7191-1:2015.

[0127] (Moist heat test, yellowness, ΔYI) In accordance with JIS K 7139:2009, Type B2 test specimens were annealed at 65°C for 24 hours, and then the molded bodies were exposed to a moist heat environment for 146 hours in a constant temperature and humidity chamber (ESPEC Corporation, Platinum J series constant temperature and humidity chamber, model: PR-1J) at a temperature of 65°C and a humidity of 65%. After the moist heat test, the yellowness and ΔYI of the test specimens before and after the test were measured using a spectrophotometer (Nippon Denshoku Industries Co., Ltd., SE-7700) in accordance with JIS K 7373.

[0128] (raw materials) The abbreviations for the compounds used in the examples and comparative examples are as follows: MMA: Methyl methacrylate (manufactured by Mitsubishi Chemical Corporation) MA: Methyl acrylate (manufactured by Mitsubishi Chemical Corporation) BA: n-Butyl acrylate (manufactured by Mitsubishi Chemical Corporation) 2EHA:2-Ethylhexylacrylate ST: Styrene (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) BzA: Benzyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., product name Viscoat #160) Dispersant (1): Dispersant produced in Production Example 1 Chain transfer agent (1): Chain transfer catalyst produced in Production Example 2 Polymerization initiator (1): 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (manufactured by NOF Corporation, trade name: Perocta-O) Polymerization initiator (2): 2,2'-Azobis(2-methylbutyronitrile) (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., trade name: V-59)

[0129] [Manufacturing Example 1: Manufacturing of Polymer (B-1)] According to the method for producing an acrylic rubber-based graft copolymer (1) in (Production Example 1) of Japanese Patent Publication No. 2000-319482, polymer (B-1) was produced by grafting 11% by mass of MMA onto a composite rubber consisting of 20% by mass of acrylic rubber (B1-1) component and 69% by mass of acrylic rubber (B1-2) component. The compositions of acrylic rubber (B1-1) and (B1-2) are 2EHA / AMA = 99.5 / 0.5 (by mass) and BA / AMA = 98 / 0.5 (by mass), respectively.

[0130] [Manufacturing Example 2: Synthesis of Dispersant (1)] In a reaction apparatus equipped with a stirrer, condenser, and thermometer, 61.6 parts of 17% by mass potassium hydroxide aqueous solution, 19.1 parts of MMA, and 19.3 parts of deionized water were charged. The mixture in the reaction apparatus was then stirred at room temperature (15°C to 35°C), and after confirming the exothermic peak, it was stirred for 4 hours. After this, the reaction mixture in the reaction apparatus was cooled to room temperature to obtain an aqueous potassium methacrylate solution.

[0131] Next, 900 parts of deionized water, 70 parts of 42% by mass aqueous solution of 2-sulfoethyl sodium methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester SEM-Na), 16 parts of the aforementioned aqueous solution of potassium methacrylate, and 7 parts of MMA were added to a polymerization apparatus equipped with a stirrer, condenser, and thermometer, and the mixture was stirred. The temperature of the solution in the reaction apparatus was raised to 50°C while purging nitrogen into the polymerization apparatus. 0.053 parts of V-50 (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., 2,2'-azobis(2-methylpropionamidine) dihydrochloride, trade name) was added to the polymerization apparatus as a polymerization initiator, and the temperature of the solution in the reaction apparatus was raised to 60°C. After the addition of the polymerization initiator, 1.4 parts of MMA were added in five installments every 15 minutes (total amount of MMA: 7 parts). Afterward, the liquid in the polymerization apparatus was stirred and maintained at 60°C for 6 hours, then cooled to room temperature to obtain a clear aqueous solution of dispersant (1) with a solid content of 8% by mass.

[0132] [Manufacturing Example 3: Synthesis of Chain Transfer Agent (1)] In a synthesis apparatus equipped with a stirring device, 2.00 g (8.03 mmol) of cobalt(II) acetate tetrahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., Wako Special Grade), 3.86 g (16.1 mmol) of diphenylglyoxime (manufactured by Tokyo Chemical Industry Co., Ltd., EP Grade), and 100 mL of diethyl ether that had been deoxygenated beforehand by nitrogen bubbling were added under a nitrogen atmosphere and stirred at room temperature for 2 hours.

[0133] Next, 20 mL of boron trifluoride diethyl ether complex (Tokyo Chemical Industries, Ltd., EP grade) was added, and the mixture was stirred for a further 6 hours. The resulting mixture was filtered, the solid was washed with diethyl ether, and dried at 20°C under a pressure of 100 MPa or less for 12 hours to obtain 5.02 g (7.93 mmol, yield 99% by mass) of a brownish solid chain transfer agent (1).

[0134] [Manufacturing Example 4: Synthesis of Macromonomer (c1)] In a polymerization apparatus equipped with a stirrer, condenser, and thermometer, 145 parts of deionized water, 0.1 parts of sodium sulfate (Na2SO4), and 0.26 parts by mass of dispersant (1) (8% solids by mass) prepared in Production Example 2 were added and stirred to obtain a homogeneous aqueous solution. Next, 95 parts of MMA, 5.0 parts of MA, 0.0014 parts of chain transfer agent (1) prepared in Production Example 3, and 0.25 parts of polymerization initiator (1) were added to obtain an aqueous dispersion.

[0135] Next, the polymerization apparatus was thoroughly purged with nitrogen, and the aqueous dispersion was heated to 80°C and held for 3 hours, then heated to 90°C and held for 2 hours. After that, the reaction solution was cooled to 40°C to obtain an aqueous suspension of macromonomers. This aqueous suspension was filtered through a filter cloth, the filtrate was washed with deionized water, and dried at 40°C for 16 hours to obtain bead-shaped macromonomers (c1). The obtained macromonomers (c1) had a number-average molecular weight (Mn) of 21,300 and a mass-average molecular weight (Mw) of 39,100.

[0136] [Manufacturing Example 5: Manufacturing of Polymer (C-1)] In a polymerization apparatus equipped with a stirrer, condenser, and thermometer, 40 parts of the macromonomer (c1) obtained in Production Example 4, 145 parts of deionized water, 0.15 parts of dispersant (1), and 0.5 parts of sodium sulfate were added and stirred to obtain an aqueous suspension. Next, the temperature inside the polymerization apparatus was raised to 70°C, and 49.8 parts of BA and 10.2 parts of ST were slowly added. Then, the mixture was maintained at 70°C for 1 hour with stirring to dissolve the macromonomer (c1) in BA and ST to obtain a dispersion. Next, the temperature inside the polymerization apparatus was cooled to 40°C, and 0.5 parts of polymerization initiator (2) were added and stirred for 30 minutes to dissolve. Next, the inside of the polymerization apparatus was thoroughly purged with nitrogen, the aqueous dispersion was raised to 82°C and maintained for 4 hours, and then raised to 90°C and maintained for 1 hour. After cooling to below 40°C, the mixture was filtered through a filter cloth, and the filtrate was washed with deionized water. Subsequently, the filtered material was dried in a hot air circulation dryer at 40°C for 12 hours to obtain a bead-like polymer (C-1), which is a graft copolymer. The obtained polymer (C-1) had a mass-average molecular weight (Mw) of 686,800.

[0137] The Tg of styrene (ST) homopolymer is 100°C (POLYMER HANDBOOK According to the FOURTH EDITION 2003, the Tg of the homopolymer of n-butyl acrylate (BA) is -54°C (POLYMER HANDBOOK FOURTH EDITION 2003). The Tg of polymer (C2) contained in polymer (C-1) was calculated to be -37.5°C using Fox's formula.

[0138] [Manufacturing Example 6: Manufacturing of Polymer (C-2)] Polymer (C-2) was obtained in the same manner as in Production Example 5, except that the monomer ratio was changed as shown in Table 1. Polymer (C-2) had a mass-average molecular weight (Mw) of 491,100.

[0139] [Example 1] 85 parts of polystyrene (manufactured by Toyo Styrene Co., Ltd., product name MW1C) as aromatic vinyl resin (A), 15 parts of polymer (B-1), and 10 parts of polymer (C-1) were placed in a polyethylene bag and hand-blended by shaking the polyethylene bag well. Then, the mixture was melt-kneaded at 230°C using a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., product name "TEM35B"), and the extruded strands were cut to obtain a pelletized resin composition. The obtained pelletized resin composition was molded using an injection molding machine (manufactured by Toshiba Machine Co., Ltd., product name "IS100EN") at a molding temperature of 220°C and a mold temperature of 60°C to obtain a type A1 molded article in accordance with JIS K 7139:2009. The obtained molded body was cut into Type B2 strip test pieces conforming to JIS K 7139:2009 using a notching tool A-4 (manufactured by Toyo Seiki Co., Ltd.), and its impact resistance was evaluated. The results are shown in Table 2.

[0140] [Examples 2-6] A pelletized resin composition was prepared in the same manner as in Example 1, except that polymer (C-2) or a hydrogenated styrene elastomer (either ToughTec H1221, ToughTec H1052, SOE S1613, or ToughTec H1522) was used as polymer (C). The resulting pellets were used as test pieces, and their impact resistance was evaluated. The results are shown in Table 2.

[0141] ToughTec H1221 is manufactured by Asahi Kasei Corporation and has a styrene / (ethylene + butylene) ratio (S / EB ratio) of 12 / 88 in the elastomer. ToughTec H1052 is manufactured by Asahi Kasei Corporation and has an S / EB ratio of 20 / 80. SOE S1613 is manufactured by Asahi Kasei Corporation and has an S / EB ratio of 33 / 67. Also, ToughTec H1522 is manufactured by Asahi Kasei Corporation and has an S / EB ratio of 30 / 70.

[0142] [Comparative Example 1] 100 parts of impact-resistant polystyrene (manufactured by Toyo Styrene Co., Ltd., product name H350) were melt-kneaded at 230°C using a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., product name "TEM35B"), and the extruded strands were cut to obtain a pelletized resin composition.

[0143] The obtained pelletized resin composition was molded using an injection molding machine (manufactured by Toshiba Machine Co., Ltd., product name "IS100EN") at a molding temperature of 220°C and a mold temperature of 60°C to obtain a Type A1 molded article in accordance with JIS K 7139:2009.

[0144] The obtained molded body was cut into Type B2 strip test pieces conforming to JIS K 7139:2009 using a notching tool A-4 (manufactured by Toyo Seiki Co., Ltd.), and its impact resistance was evaluated. The results are shown in Table 2.

[0145] [Table 1]

[0146] [Table 2]

[0147] Comparing the results of the yellowness test in Examples 1-6 and Comparative Example 1, it can be seen that the molded article made from the resin composition according to one embodiment of the present invention has a superior yellowness compared to Comparative Example 1. Furthermore, examining the results before and after the moist heat test for Examples 1-2, Examples 4-6, and Comparative Example 1, it can be seen that the molded articles made from the resin compositions of Examples 1-2 or Examples 4-6 showed a smaller change in yellowness (ΔYI) under a moist heat environment compared to Comparative Example 1, indicating that they are molded articles with superior long-term properties.

[0148] Furthermore, it was found that the molded articles made from the resin compositions of Examples 1 to 6 exhibited physical properties equivalent to or better than those of Comparative Example 1 in terms of impact resistance and heat resistance. Moreover, it was found that the molded articles made from the resin compositions of Examples 1 to 6 showed increased load deflection temperatures under humid heat environments, indicating that they are molded articles with excellent long-term properties. [Industrial applicability]

[0149] A resin composition according to one aspect of the present invention exhibits excellent colorfastness and long-term properties. Therefore, this resin composition can be used in packaging materials, food containers, building materials, toys, stationery and other miscellaneous goods, automobile parts, office automation equipment, home appliances, and the like.< / z>

Claims

1. It comprises an aromatic vinyl resin (A), a polymer (B), and a polymer (C), The polymer (B) comprises a polymer (B1) portion having a crosslinked structure and a polymer (B2) portion having a constituent unit (b2) derived from alkyl (meth)acrylate. A resin composition in which the polymer (C) substantially does not have a crosslinked structure.

2. The resin composition according to claim 1, wherein the content of the polymer (B1) portion is 70% by mass or more and 95% by mass or less, based on 100% by mass of the total of the polymer (B1) portion and the polymer (B2) portion.

3. The resin composition according to claim 1, wherein the polymer (B1) portion has a constituent unit (b1) derived from alkyl (meth)acrylate.

4. The resin composition according to claim 1, wherein the constituent unit (b2) is a constituent unit derived from methyl methacrylate.

5. The resin composition according to claim 1, wherein the polymer (C) is a copolymer comprising constituent units derived from the following general formula (1) and / or the following general formula (2). 【Chemistry 1】 (In formula (1), V １ ~V ４ Each of these is independently a hydrogen atom, an alkyl group, a vinyl group, an aryl group, or a heterocyclic group. 【Chemistry 2】 (In formula (2), W １ and W ２ Each of these is independently a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group. Y represents an ester bond, an amide bond, a carbonyl bond, or an ether bond.

6. The resin composition according to claim 5, wherein the polymer (C) is a block copolymer and / or graft copolymer comprising a polymer (C1) portion containing 50% by mass or more of repeating units derived from methyl methacrylate and a polymer (C2) portion having a glass transition temperature of 0°C or lower.

7. The resin composition according to claim 6, wherein the polymer (C) contains 50% by mass or less of the polymer (C1) portion.

8. The resin composition according to claim 1, wherein the weight-average molecular weight (Mw) of the polymer (C) is 300,000 or more.

9. The resin composition according to claim 5, wherein the polymer (C) comprises a constituent unit derived from a macromonomer (c1) represented by the following general formula (3). 【Transformation 3】 (In formula (3), R ０ ~R ｎ Each of these is independently a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group. １ ~X ｎ Each of these is independently either a hydrogen atom or a methyl group. Z is a terminal group. n is a natural number between 1 and 10,000.

10. The resin composition according to claim 1, wherein the polymer (C) is a random copolymer containing 1% by mass or more and 50% by mass or less of constituent units derived from (meth)acrylate.

11. The resin composition according to claim 1, wherein the polymer (C) contains constituent units derived from monomers having a glass transition temperature of 0°C or lower.

12. The resin composition according to claim 1, wherein the polymer (C) comprises structural units derived from an aromatic vinyl monomer.

13. The resin composition according to claim 1, wherein the polymer (C) is a hydrogenated styrene-diene block copolymer.

14. The resin composition according to claim 1, wherein the aromatic vinyl resin (A) is polystyrene.

15. The resin composition according to claim 1, wherein the content of the aromatic vinyl resin (A) is 1% by mass or more and 99% by mass or less, based on 100% by mass of the total of the aromatic vinyl resin (A) and the polymer (B).

16. The resin composition according to claim 1, wherein the content of the polymer (C) is 1 part by mass or more and 500 parts by mass or less with respect to 100 parts by mass of the total of the aromatic vinyl resin (A) and the polymer (B).

17. A molding material comprising the resin composition according to any one of claims 1 to 16.

18. A molded body obtained by molding the molding material described in claim 17.

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