Resin composition, plate-like molded article, multilayer body, and anti-reflective molded article

Abstract

Provided are: a resin composition from which a flat molded body having a high transparency, high refractive index, and high hardness can be provided; and a flat molded body, a multilayer body, and an anti-reflection molded body which are formed of the resin composition. The resin composition includes: 25-90 parts by mass of a copolymer resin (A) composed of a monomer composition a containing 37-96 mass% of a compound represented by formula (a-1), 1-60 mass% of an aromatic vinyl compound, and 3-62 mass% of an unsaturated dicarboxylic anhydride and / or a maleimide compound; and 10-75 parts by mass of a copolymer resin (B) composed of a monomer composition b containing 73-83 mass% of an aromatic vinyl compound and 17-27 mass% of an unsaturated dicarboxylic anhydride. In formula (a-1), Ra1 is a hydrogen atom or a methyl group, and Ra2 is an aliphatic group.

Description

[Technical field]

[0001] The present invention relates to a resin composition, a tabular molded article, a multilayer body, and an anti-reflective molded article. [Background technology]

[0002] Acrylic resins are used in many applications as optical materials because they have excellent transparency, moldability, and surface hardness. However, because acrylic resins have poor material toughness, it is known that multilayer films and sheets are produced by co-extrusion with polycarbonate resins, which have excellent transparency and material toughness (Patent Document 1). However, there is a large difference in refractive index between acrylic resin and polycarbonate resin, which can cause a defect known as "rainbow unevenness" when used in optical components. Moreover, a sheet made of an acrylic resin is naturally required to maintain transparency. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 55-059929 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to solve these problems, and to provide a resin composition capable of providing a molded article (particularly, a flat-plate molded article) having high transparency, refractive index, and hardness, as well as a flat-plate molded article, a multilayer body, and an anti-reflective molded article formed from the resin composition. [Means for solving the problem]

[0005] In light of the above problems, it has been discovered that the above problems can be solved by using a blend of specific resins. Specifically, the above problems were solved by the following means. <1> A resin composition comprising: 25 to 90 parts by mass of a copolymer resin (A) composed of a monomer composition a containing 37 to 96% by mass of a compound represented by formula (a-1), 1 to 60% by mass of an aromatic vinyl compound, and 3 to 62% by mass of an unsaturated dicarboxylic acid anhydride and / or a maleimide compound; and 10 to 75 parts by mass of a copolymer resin (B) composed of a monomer composition b containing 73 to 83% by mass of an aromatic vinyl compound and 17 to 27% by mass of an unsaturated dicarboxylic acid anhydride. Formula (a-1) [ka] (In formula (a-1), Ra 1 is a hydrogen atom or a methyl group, and Ra 2 is an aliphatic group. <2> The resin composition is subjected to 240° C. for 1220 seconds. -1 The melt viscosity at a shear rate of 500 Pa s or less. <1> The resin composition according to claim 1. <3> Furthermore, at least one of an acrylic resin composed of a monomer composition e (excluding one corresponding to the copolymer resin (A)) and an acrylic resin composed of a monomer composition f is contained in a ratio of more than 0 part by mass and not more than 30 parts by mass per 100 parts by mass of the total of the copolymer resin (A) and the copolymer resin (B), the monomer composition e contains 70 to 100% by mass of a compound represented by formula (e), and the monomer composition f contains 10 to 40% by mass of a compound represented by formula (f-1). <1> or <2> The resin composition according to claim 1. Formula (e) [ka] (In formula (e), Re 1 is a hydrogen atom or a methyl group, and Re 2 is an aliphatic group. Formula (f-1) [ka] (In formula (f-1), Rf 1 is a hydrogen atom or a methyl group, and Rf 2 is an aromatic ring-containing group. <4> The copolymer resin (A) contains 62 to 70 parts by mass of a copolymer resin (A) and 38 to 30 parts by mass of a copolymer resin (B), and contains an acrylic resin constituted by a monomer composition e in an amount of 6 to 30 parts by mass per 100 parts by mass of the total of the copolymer resin (A) and the copolymer resin (B). <3> The resin composition according to claim 1. <5> When the resin composition is molded into a 3 mm thick plate-shaped molded product, the haze is 5% or less. <1> ~ <4> 10. The resin composition according to claim 9 . <6> The resin composition has a refractive index of 1.535 or more as measured by a polarized light diffraction method. <1> ~ <5> 10. The resin composition according to claim 9 . <7> A glass transition temperature measured by differential scanning calorimetry is 123° C. or higher. <1> ~ <6> 10. The resin composition according to claim 9 . <8> The pencil hardness of a flat plate-shaped molded body formed from the resin composition is F or more. <1> ~ <7> 10. The resin composition according to claim 9 . <9> The copolymer resin (B) has a weight average molecular weight of 100,000 or less. <1> ~ <8> 10. The resin composition according to claim 9 . <10> The copolymer resin (B) has a refractive index of 1.570 or more as measured by a polarized light diffraction method. <1> ~ <9> 10. The resin composition according to claim 9 . <11> Further, the composition contains at least one of an antioxidant and a release agent. <1> ~ <10> 10. The resin composition according to claim 9 . <12> The content of the antioxidant is 0.001 to 0.5 parts by mass relative to 100 parts by mass of the resin composition. <11> The resin composition according to claim 1. <13> The content of the release agent is 0.001 to 0.5 parts by mass relative to 100 parts by mass of the resin composition. <11> or <12> The resin composition according to claim 1. <14> <1> ~ <13> 1. A flat plate-like molded product formed from the resin composition according to any one of claims 1 to 9. <15> A substrate; <14> A multilayer body having the flat plate-like molded body according to claim 1. <16> The thickness of the multilayer body is 20 to 10,000 μm. <15> The multilayer body according to claim 1. <17> The substrate comprises a polycarbonate resin; <15> or <16> The multilayer body according to claim 1. <18> The curvature radius is 50 mmR or less. <15> ~ <17> 13. The multilayer body according to any one of claims 1 to 12. <19> Further, the present invention has a hard coat layer on the flat plate-like molded body and / or the substrate. <15> ~ <18> 13. The multilayer body according to any one of claims 1 to 12. <20> Further, an anti-reflection layer is provided on the hard coat layer. <19> The multilayer body according to claim 1. <21> Furthermore, at least one surface of the multilayer body is subjected to one or more of an anti-fingerprint treatment, an anti-glare treatment, a weather resistance treatment, an antistatic treatment, an anti-soiling treatment, and an anti-blocking treatment. <15> ~ <20> 13. The multilayer body according to any one of claims 1 to 12. <22> <15> ~ <21> 13. An anti-reflective molding comprising the multilayer body according to claim 12. Effect of the Invention

[0006] The present invention makes it possible to provide a resin composition capable of providing a plate-like molded article having high transparency, refractive index and hardness, as well as a plate-like molded article, a multilayer body and an anti-reflective molded article formed from the resin composition. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an example of an antireflection molding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be described in detail below. In this specification, the word "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit. In this specification, various physical properties and characteristic values ​​are those at 23° C. unless otherwise specified. In the description of groups (atomic groups) in this specification, the description that does not indicate whether substituted or unsubstituted includes groups (atomic groups) that have no substituents as well as groups (atomic groups) that have substituents. For example, "alkyl group" includes not only alkyl groups that have no substituents (unsubstituted alkyl groups), but also alkyl groups that have substituents (substituted alkyl groups). In the present invention, it is preferable that no substituents are present unless otherwise specified. In this specification, "(meth)acrylate" refers to both or either of acrylate and methacrylate. In this specification, the flat plate-like molded body and the multi-layered body each include those in the shape of a film or a sheet. The terms "film" and "sheet" refer to a molded body that is thin relative to its length and width and is generally flat. In this specification, the "film" may be either a single layer or a multi-layered body. In this specification, "parts by mass" indicates the relative amount of a component, and "% by mass" indicates the absolute amount of a component. The monomer composition refers to a composition containing monomers that are raw materials for constituting a copolymer resin, and the resin composed of a monomer composition refers to a resin obtained by polymerizing the monomers in the monomer composition.

[0009] The resin composition of the present invention is characterized by comprising 25 to 90 parts by mass of a copolymer resin (A) composed of a monomer composition a containing 37 to 96% by mass of a compound represented by formula (a-1), 1 to 60% by mass of an aromatic vinyl compound, and 3 to 62% by mass of an unsaturated dicarboxylic acid anhydride and / or a maleimide compound, and 10 to 75 parts by mass of a copolymer resin (B) composed of a monomer composition b containing 73 to 83% by mass of an aromatic vinyl compound and 17 to 27% by mass of an unsaturated dicarboxylic acid anhydride. Formula (a-1) [ka] (In formula (a-1), Ra 1 is a hydrogen atom or a methyl group, and Ra 2 is an aliphatic group. By adopting such a configuration, it is possible to provide a resin composition capable of providing a plate-like molded article having high transparency, refractive index, and hardness, as well as a plate-like molded article and a multilayer body formed from the resin composition. Furthermore, the present invention can provide a resin composition having excellent heat resistance. It is also possible to produce a flat plate-like molded product with no flow marks. In addition, when it is made into a multi-layered body, it can have excellent thermal bending properties and no interference fringes.

[0010] <Copolymer resin (A)> The copolymer resin (A) used in the present invention is composed of a monomer composition a containing 37-96% by mass of the compound represented by formula (a-1), 1-60% by mass of an aromatic vinyl compound, and 3-62% by mass of an unsaturated dicarboxylic anhydride and / or a maleimide compound. By using such a resin, the heat resistance and compatibility tend to be superior to those of a normal methacrylic resin composition. In the monomer composition a, the total amount of the compound represented by formula (a-1), the aromatic vinyl compound, the unsaturated dicarboxylic anhydride, and the maleimide compound does not exceed 100% by mass, and is preferably 98-100% by mass.

[0011] <<Compound represented by formula (a-1)>> The monomer composition a contains a compound represented by formula (a-1). By using such a compound, the scratch resistance of the molded article tends to be further improved. Formula (a-1) [ka] (In formula (a-1), Ra 1 is a hydrogen atom or a methyl group, and Ra 2 is an aliphatic group. In formula (a-1), Ra 1 is preferably a methyl group. In formula (a-1), Ra 2is preferably a linear or branched aliphatic group, more preferably a linear aliphatic group. Examples of the aliphatic group include an alkyl group (including a cycloalkyl group), an alkynyl group (including a cycloalkynyl group), and an alkenyl group (including a cycloalkenyl group), of which an alkyl group is preferred, a linear or branched alkyl group is more preferred, and a linear alkyl group is even more preferred. The aliphatic group Ra 2 The number of carbon atoms in the alkyl group is preferably 1 to 10, more preferably 1 to 5, even more preferably 1 to 3, still more preferably 1 or 2, and even more preferably 1. The compound represented by formula (a-1) is preferably an alkyl(meth)acrylate (preferably an alkyl methacrylate), and particularly preferably a methyl(meth)acrylate (preferably methyl methacrylate). The molecular weight of the compound represented by formula (a-1) is preferably 86-600.

[0012] The content of the compound represented by formula (a-1) in the monomer composition a is 37 to 96% by mass. The lower limit of the content is preferably 45% by mass or more, more preferably 55% by mass or more, even more preferably 65% ​​by mass or more, and even more preferably 72% by mass or more. By making the content equal to or more than the lower limit, the scratch resistance of the molded article tends to be further improved. The upper limit of the content is preferably 90% by mass or less, more preferably 87% by mass or less, and even more preferably 83% by mass or less. The monomer composition a may contain only one type of compound represented by formula (a-1), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0013] <<Aromatic vinyl compounds>> The monomer composition a contains an aromatic vinyl compound. By using such a compound, the refractive index tends to be further improved. The aromatic vinyl compound in the present invention is a compound having a vinyl group and an aromatic ring group. 1 -Ar 1 Preferably, the compound is represented by the formula: 1 is a single bond or a divalent linking group, preferably a single bond or a divalent linking group having a formula weight of 100 to 500, and more preferably a single bond or a divalent linking group having a formula weight of 100 to 300. 1 When L is a divalent linking group, it is preferably an aliphatic hydrocarbon group or a group consisting of a combination of an aliphatic hydrocarbon group and -O-. 1 The formula weight of the other compounds is the same as above. 1 is an aromatic ring group, which is preferably a substituted or unsubstituted benzene ring group or naphthalene ring group (preferably a benzene ring group), and more preferably an unsubstituted benzene ring group.

[0014] More specifically, the aromatic vinyl compound preferably includes an aromatic vinyl compound represented by formula (a-2). Formula (a-2) [ka] (In formula (a-2), Ra 3 is a substituent, and na is an integer of 0 to 6.

[0015] In formula (a-2), Ra 3 is a substituent, and examples thereof include a halogen atom (preferably a chlorine atom, a fluorine atom, or a bromine atom), a hydroxyl group, an alkyl group (preferably an alkyl group having 1 to 5 carbon atoms), an aryl group (preferably a phenyl group), an alkenyl group (preferably an alkenyl group having 2 to 5 carbon atoms), an alkoxy group (preferably an alkoxy group having 1 to 5 carbon atoms), and an aryloxy group (preferably a phenoxy group). When na is 2 or more, a plurality of Ra 3 may be the same or different. Preferably, na is an integer of 5 or less, more preferably an integer of 4 or less, even more preferably an integer of 3 or less, even more preferably an integer of 2 or less, even more preferably an integer of 1 or less, and even more preferably 0.

[0016] The aromatic vinyl compound is preferably a compound having a molecular weight of 104-600, and more preferably a compound having a molecular weight of 104-400. Specific examples of the aromatic vinyl compound include styrene and styrene derivatives such as styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, methoxystyrene, monobromostyrene, dibromostyrene, fluorostyrene, and tribromostyrene, with styrene being particularly preferred.

[0017] The content of the aromatic vinyl compound in the monomer composition a is 1 to 60% by mass. The lower limit of the content is preferably 2% by mass or more, more preferably 3% by mass or more, and may be 13% by mass or more. By making the content equal to or more than the lower limit, the refractive index of the resulting resin composition tends to be improved. The upper limit of the content is preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 30% by mass or less, and even more preferably 20% by mass or less. By making the content equal to or less than the upper limit, the compatibility between the copolymer resin (A) and the copolymer resin (B) tends to be improved, and the resulting resin composition tends to be more transparent. The monomer composition a may contain only one type of aromatic vinyl compound, or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0018] <<Unsaturated dicarboxylic acid anhydride and / or maleimide compound>> The monomer composition a contains an unsaturated dicarboxylic anhydride and / or a maleimide compound. The unsaturated dicarboxylic anhydride and / or the maleimide compound is preferably a compound having a molecular weight of 97 to 600. By using such a compound, the heat resistance of the molded article tends to be further improved.

[0019] The unsaturated dicarboxylic acid anhydride is not particularly limited in type, but is preferably an unsaturated dicarboxylic acid anhydride represented by formula (a-3). Formula (a-3) [ka] (In formula (a-3), Ra 4 are each independently a hydrogen atom or a substituent. In formula (a-3), Ra 4 When is a substituent, it is preferably an aliphatic hydrocarbon group or a halogen atom (preferably a fluorine atom, a chlorine atom, or a bromine atom), more preferably an aliphatic hydrocarbon group, and further preferably an alkyl group or an alkenyl group. The number of carbon atoms of the aliphatic hydrocarbon group is preferably 1 to 5. Two Ra 4 may be the same or different. 4 They may be bonded to each other to form a ring. 4 is preferably a hydrogen atom. Specific examples of the unsaturated dicarboxylic anhydride include maleic anhydride, phthalic anhydride, succinic anhydride, aconitic anhydride, etc., with maleic anhydride being preferred. Halides of these are also preferred.

[0020] The maleimide compound is not particularly limited in terms of its type, but is preferably maleimide or a derivative thereof, more preferably an N-substituted maleimide, and more preferably a compound represented by formula (a-4). Formula (a-4) [ka] (In formula (a-4), Ra 5 are each independently a hydrogen atom or a substituent,6 is a substituent. In formula (a-4), Ra 5 When is a substituent, it is preferably an aliphatic hydrocarbon group or a halogen atom (preferably a fluorine atom, a chlorine atom, or a bromine atom), more preferably an aliphatic hydrocarbon group, and further preferably an alkyl group or an alkenyl group. The number of carbon atoms of the aliphatic hydrocarbon group is preferably 1 to 5. Two Ra 5 may be the same or different. 5 They may be bonded to each other to form a ring, but it is preferable that they are not bonded. 5 is preferably a hydrogen atom. Ra 6 The substituent as is preferably a hydrocarbon group (preferably a hydrocarbon group having 1 to 20 carbon atoms, more preferably a hydrocarbon group having 1 to 12 carbon atoms), more preferably an aliphatic group or an aromatic ring group. The aliphatic group is preferably a linear, branched or cyclic alkyl group, more preferably a linear or cyclic alkyl group, more preferably a cyclic alkyl group, even more preferably a cyclic alkyl group having 3 to 8 carbon atoms, and even more preferably a cyclohexyl group. The aliphatic group may have a substituent, and specific examples thereof include a halogen atom (preferably a fluorine atom, a chlorine atom, or a bromine atom), an aromatic ring group, and a maleimide group. It is preferable that the aliphatic group does not have a substituent. As the aromatic ring group, phenyl group and naphthyl group are preferred, and phenyl group is more preferred.In addition, the aromatic ring group may have a substituent, and specific examples thereof include a halogen atom (preferably a fluorine atom, a chlorine atom, a bromine atom), an aliphatic group, a maleimide group, etc.It is preferred that the aromatic ring group does not have a substituent. Specific examples of the maleimide compound include maleimide, N-phenylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide, and N-(4-carboxyphenyl)maleimide, with N-cyclohexylmaleimide and N-phenylmaleimide being preferred. Halides of these compounds are also preferred.

[0021] The total content of the unsaturated dicarboxylic anhydride and maleimide compound in the monomer composition a is 3 to 62% by mass. The lower limit of the content is preferably 5% by mass or more, more preferably 7% by mass or more, and may be 10% by mass or more, 15% by mass or more, or 20% by mass or more. By making the content equal to or more than the lower limit, the heat resistance of the molded article tends to be further improved. The upper limit of the content is preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less, and may be 20% by mass or less, or 18% by mass or less. The monomer composition a may contain only one of the unsaturated dicarboxylic anhydride and the maleimide compound, or may contain two or more selected from the unsaturated dicarboxylic anhydride and the maleimide compound. When two or more types are contained, the total amount is preferably within the above range.

[0022] <<Other Monomers>> The monomer composition a may contain other monomers in addition to the compound represented by formula (a-1), the aromatic vinyl compound, the unsaturated dicarboxylic acid anhydride, and the maleimide compound, without departing from the spirit and scope of the present invention. The other monomer is a monomer copolymerizable with the compound represented by formula (a-1), the aromatic vinyl compound, the unsaturated dicarboxylic acid anhydride, and the maleimide compound, and examples thereof include (meth)acrylate compounds other than the compound represented by formula (a-1), non-aromatic vinyl compounds, and the like. The molecular weight of the other monomer is preferably 28-600.

[0023] The content of other monomers in the monomer composition a is preferably 0 to 5 mass%, more preferably 0 to 3 mass%, even more preferably 0 to 1 mass%, and even more preferably substantially 0 mass%. Substantially 0 mass% means that the content does not include other monomers other than components unintentionally mixed in such as impurities.

[0024] Furthermore, the monomer composition a may contain components such as an antioxidant, an end-capping agent, a catalyst, etc. in addition to the raw material monomers. The total amount of these is usually 1% by mass or less of the total amount of the raw material monomers.

[0025] Next, preferred physical properties of the copolymer resin (A) will be described. The copolymer resin (A) preferably has a glass transition temperature of 105° C. or higher, more preferably 110° C. or higher, even more preferably 115° C. or higher, and even more preferably 118° C. or higher. By making the glass transition temperature equal to or higher than the above lower limit, the heat resistance of the molded article tends to be further improved. The glass transition temperature of the copolymer resin (A) may be 170° C. or lower, 160° C. or lower, or 150° C. or lower. The glass transition temperature is measured according to the method described in the Examples below (hereinafter, the same applies to the glass transition temperatures of other resins). When the resin composition of the present invention contains two or more copolymer resins (A), the glass transition temperature of the mixture of the copolymer resins (A) is defined as the glass transition temperature of the copolymer resin (A) (hereinafter the same applies to glass transition temperature).

[0026] The weight average molecular weight of the copolymer resin (A) is preferably 70,000 or more, more preferably 90,000 or more. By making it equal to or more than the above lower limit, the impact resistance and toughness of the molded article tend to be further improved. In addition, the upper limit of the weight average molecular weight of the copolymer resin (A) is preferably 300,000 or less, more preferably 250,000 or less, and even more preferably 200,000 or less. By making it equal to or less than the above upper limit, the moldability tends to be further improved. The weight average molecular weight is measured according to the method described in the Examples below (hereinafter, the same applies to the weight average molecular weights of other resins). When the resin composition of the present invention contains two or more types of copolymer resins (A), the weight average molecular weight of the mixture of copolymer resins (A) is the weight average molecular weight of copolymer resin (A) (hereinafter the same applies to the weight average molecular weights of other resins).

[0027] The refractive index of the copolymer resin (A) is preferably 1.520 or more, more preferably 1.525 or more, and even more preferably 1.529 or more. By making it equal to or more than the above lower limit, the occurrence of interference fringes during molding of a multilayer body tends to be more effectively suppressed. The upper limit of the refractive index of the copolymer resin (A) may be 1.650 or less. By making it equal to or less than the above upper limit, the occurrence of interference fringes during molding of a multilayer body can be more effectively suppressed. The refractive index is measured according to the method described in the Examples below (hereinafter, the same applies to the refractive indexes of other resins). When the resin composition of the present invention contains two or more kinds of copolymer resins (A), the refractive index of the mixture of the copolymer resins (A) is taken as the refractive index of the copolymer resin (A) (hereinafter the same applies to the refractive index).

[0028] The pencil hardness of the copolymer resin (A) is preferably at least F, and more preferably at least H. The upper limit of the pencil hardness of the copolymer resin (A) may be at most 4H, or even at most 3H. The pencil hardness is measured according to the method described in the Examples below (hereinafter the same applies to pencil hardness). When the resin composition of the present invention contains two or more types of copolymer resins (A), the pencil hardness of the mixture of copolymer resins (A) is the pencil hardness of the copolymer resin (A) (hereinafter the same applies to pencil hardness).

[0029] <Copolymer resin (B)> The copolymer resin (B) used in the present invention is composed of a monomer composition b containing 73-83% by mass of an aromatic vinyl compound and 17-27% by mass of an unsaturated dicarboxylic anhydride. By using such a resin, the heat resistance and compatibility tend to be improved compared to ordinary styrene-based resins. In the monomer composition b, the total amount of the aromatic vinyl compound and the unsaturated dicarboxylic anhydride does not exceed 100% by mass, and is preferably 98-100% by mass.

[0030] <<Aromatic vinyl compounds>> The monomer composition b contains an aromatic vinyl compound. By using such a compound, the copolymer resin (B) becomes more compatible with the copolymer resin (A), and the transparency of the obtained molded article tends to be further improved. In the present invention, the aromatic vinyl compound is a compound having a vinyl group and an aromatic ring group. 1 -Ar 1 Preferably, the compound is represented by the formula: 1 is a single bond or a divalent linking group, preferably a single bond or a divalent linking group having a formula weight of 100 to 500, and more preferably a single bond or a divalent linking group having a formula weight of 100 to 300. 1 When Ar is a divalent linking group, it is preferably an aliphatic hydrocarbon group or a group consisting of a combination of an aliphatic hydrocarbon group and -O-. 1 is an aromatic ring group, which is preferably a substituted or unsubstituted benzene ring group or naphthalene ring group (preferably a benzene ring group), and more preferably an unsubstituted benzene ring group.

[0031] More specifically, the aromatic vinyl compound preferably contains an aromatic vinyl compound represented by formula (a-2). The details of the aromatic vinyl compound represented by formula (a-2) are the same as those of the aromatic vinyl compound represented by formula (a-2) described above for the monomer composition a, and the preferred range is also the same.

[0032] The aromatic vinyl compound is preferably a compound having a molecular weight of 104-600, and more preferably a compound having a molecular weight of 104-400. Specific examples of the aromatic vinyl compound include styrene and styrene derivatives such as styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, methoxystyrene, monobromostyrene, dibromostyrene, fluorostyrene, and tribromostyrene, with styrene being particularly preferred.

[0033] The content of the aromatic vinyl compound in the monomer composition b is 73 to 83% by mass. The lower limit of the content is preferably 74% by mass or more, more preferably 75% by mass or more, even more preferably 76% by mass or more, and even more preferably 77% by mass or more. By making it equal to or more than the above lower limit, the compatibility between the copolymer resin (A) and the copolymerizable resin (B) tends to be further improved, and the obtained resin composition tends to be more excellent in transparency. The upper limit of the content is preferably 81% by mass or less, and more preferably 79% by mass or less. The monomer composition b may contain only one type of aromatic vinyl compound, or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0034] <<Unsaturated dicarboxylic acid anhydrides>> The monomer composition b contains an unsaturated dicarboxylic acid anhydride. By using such a compound, the compatibility with the copolymer resin (A) tends to be improved, and the transparency of the obtained molded article tends to be improved. The unsaturated dicarboxylic anhydride is not particularly limited in type, but is preferably an unsaturated dicarboxylic anhydride represented by formula (a-3). The details of the unsaturated dicarboxylic anhydride represented by formula (a-3) are the same as those of the unsaturated dicarboxylic anhydride represented by formula (a-3) described in the above monomer composition a, and the preferred range is also the same. Specific examples of the unsaturated dicarboxylic anhydride include maleic anhydride, phthalic anhydride, succinic anhydride, aconitic anhydride, etc., with maleic anhydride being preferred. Halides of these are also preferred. The unsaturated dicarboxylic acid anhydride is preferably a compound having a molecular weight of 97-600.

[0035] The content of the unsaturated dicarboxylic anhydride in the monomer composition b is 16 to 27% by mass. The lower limit of the content is preferably 19% by mass or more, and more preferably 21% by mass or more. The upper limit of the content is preferably 26% by mass or less, more preferably 25% by mass or less, and even more preferably 24% by mass or less, and may be 23% by mass or less. By setting the content within the above range, compatibility with the copolymer resin (A) tends to be further improved, and the obtained resin composition tends to be more excellent in transparency. The monomer composition b may contain only one kind of unsaturated dicarboxylic acid anhydride, or may contain two or more kinds. When two or more kinds are contained, the total amount is preferably within the above range.

[0036] <<Other Monomers>> The monomer composition b may contain other monomers in addition to the aromatic vinyl compound and the unsaturated dicarboxylic acid anhydride. The other monomer is a monomer copolymerizable with the aromatic vinyl compound and the unsaturated dicarboxylic acid anhydride, and examples thereof include a (meth)acrylate compound and a non-aromatic vinyl compound. The molecular weight of the other monomer is preferably 28 to 600.

[0037] The content of other monomers in the monomer composition b is preferably 0 to 5 mass%, more preferably 0 to 3 mass%, even more preferably 0 to 1 mass%, and even more preferably substantially 0 mass%. Substantially 0 mass% means that the content does not include other monomers other than components unintentionally mixed in such as impurities.

[0038] Furthermore, the monomer composition b may contain components such as an antioxidant, an end-capping agent, a catalyst, etc. in addition to the raw material monomers. The total amount of these is usually 1 mass % or less of the total amount of the raw material monomers.

[0039] Next, preferred physical properties of the copolymer resin (B) will be described. The copolymer resin (B) preferably has a high glass transition temperature, specifically, preferably 125°C or higher, more preferably 130°C or higher, and even more preferably 135°C or higher. By setting the glass transition temperature to the above lower limit or higher, the heat resistance of the molded article tends to be further improved, which is preferable. The glass transition temperature of the copolymer resin (B) may be 180°C or lower, or may be 170°C or lower, 156°C or lower, 151°C or lower, or 146°C or lower.

[0040] The weight average molecular weight of the copolymer resin (B) is preferably 60,000 or more. By making it equal to or more than the above lower limit, the impact resistance and toughness of the molded article tend to be further improved. In addition, the upper limit of the weight average molecular weight of the copolymer resin (B) is preferably 100,000 or less, more preferably 90,000 or less, and even more preferably 80,000 or less. By making it equal to or less than the above upper limit, the moldability tends to be further improved.

[0041] The refractive index of the copolymer resin (B) is preferably 1.570 or more, more preferably 1.575 or more, and even more preferably 1.577 or more. The upper limit of the refractive index of the copolymer resin (B) may be 1.65 or less. By making the refractive index equal to or less than the upper limit, the occurrence of interference fringes during molding of a multilayer body can be more effectively suppressed. The refractive index is measured according to the method described in the Examples below (hereinafter the same applies to the refractive index).

[0042] The pencil hardness of the copolymer resin (B) is preferably 2B or more, more preferably B or more. By making it equal to or more than the above lower limit, the scratch resistance of the molded article of the present resin composition tends to be further improved. In addition, the upper limit of the pencil hardness of the copolymer resin (B) may be H or less, or even F or less.

[0043] <Other resins> The resin composition of the present invention may contain a resin other than the copolymer resin (A) and the copolymer resin (B) without departing from the spirit of the present invention. Specifically, examples of the compounding include blending a resin having high pencil hardness to increase the hardness of the resin composition, and blending a low molecular weight resin to improve flow marks during sheet molding.

[0044] The first embodiment of the other resin is an acrylic resin composed of a monomer composition e containing 70 to 100 mass% of a compound represented by formula (e). In the first embodiment, those corresponding to the copolymer resin (A) are excluded. By including an acrylic resin composed of a monomer composition e containing 70 to 100 mass% of a compound represented by formula (e), the hardness of the resin composition can be further improved.

[0045] The monomer composition e contains a compound represented by formula (e): By using such a compound, the scratch resistance of the molded article can be further improved. Formula (e) [ka] (In formula (e), Re 1 is a hydrogen atom or a methyl group, and Re 2 is an aliphatic group. In formula (e), Re 2 is preferably a linear or branched aliphatic group, more preferably a linear aliphatic group. Examples of the aliphatic group include an alkyl group (including a cycloalkyl group), an alkynyl group (including a cycloalkynyl group), and an alkenyl group (including a cycloalkenyl group), of which an alkyl group is preferred, a linear or branched alkyl group is more preferred, and a linear alkyl group is even more preferred. 2 The aliphatic group preferably has 1 to 10 carbon atoms, more preferably 1 to 5 carbon atoms, even more preferably 1 to 3 carbon atoms, even more preferably 1 or 2 carbon atoms, and even more preferably 1 carbon atom. The compound represented by formula (e) is preferably an alkyl(meth)acrylate, and particularly preferably methyl(meth)acrylate. The compound represented by formula (e) is preferably composed of 93 to 99 mass % of alkyl methacrylate (preferably methyl methacrylate) and 7 to 1 mass % of alkyl acrylate (preferably methacrylic acid). The molecular weight of the compound represented by formula (e) is preferably 86-600.

[0046] The content of the compound represented by formula (e) in the monomer composition e is 70 to 100% by mass. The lower limit of the content is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 99% by mass or more. By making the content equal to or more than the lower limit, the scratch resistance of the molded article tends to be further improved. The upper limit of the content is preferably 100% by mass or less. The monomer composition e may contain only one type of compound represented by formula (e), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0047] <<Other Monomers>> The monomer composition e may contain other monomers in addition to the compound represented by formula (e). The other monomer is a monomer copolymerizable with the compound represented by formula (e), and examples thereof include (meth)acrylate compounds and vinyl compounds other than the compound represented by formula (e). The molecular weight of the other monomer is preferably 28-600.

[0048] The content of other monomers in the monomer composition e is preferably 0 to 5 mass%, more preferably 0 to 3 mass%, even more preferably 0 to 1 mass%, and even more preferably substantially 0 mass%. Substantially 0 mass% means that the content does not include other monomers other than components unintentionally mixed in such as impurities.

[0049] Furthermore, the monomer composition e may contain components such as an antioxidant, an end-capping agent, a catalyst, etc. in addition to the raw material monomers. The total amount of these is usually 1% by mass or less of the total amount of the raw material monomers.

[0050] Next, preferred physical properties of the other resins in the first embodiment will be described. The glass transition temperature of the other resin of the first embodiment is preferably 90° C. or higher, more preferably 95° C. or higher, and even more preferably 100° C. or higher. By setting the glass transition temperature to be equal to or higher than the above lower limit, the heat resistance tends to be further improved. In addition, the glass transition temperature of the other resin of the first embodiment may be 125° C. or lower, or may be 120° C. or lower.

[0051] The weight average molecular weight of the other resin in the first embodiment is preferably 60,000 or more, more preferably 70,000 or more. By making it equal to or more than the above lower limit, the impact resistance and toughness of the molded body tend to be further improved. In addition, the upper limit of the weight average molecular weight is preferably 300,000 or less, more preferably 200,000 or less, and even more preferably 150,000 or less. By making it equal to or less than the above upper limit, flow marks during molding of the multilayer sheet tend to be more effectively suppressed.

[0052] The pencil hardness of the other resin in the first embodiment is preferably F or more, more preferably H or more. By making it equal to or more than the above lower limit, the scratch resistance of the molded body tends to be further improved. The upper limit of the pencil hardness may be 3H or less, or even 2H or less.

[0053] The second embodiment of the other resin is an acrylic resin composed of a monomer composition f containing 10 to 40 mass% of a compound represented by formula (f-1). By containing an acrylic resin composed of a monomer composition f containing 10 to 40 mass% of a compound represented by formula (f-1), the occurrence of flow marks can be more effectively suppressed. In addition, the hardness of the obtained molded article can be further improved. Formula (f-1) [ka] (In formula (f-1), Rf 1 is a hydrogen atom or a methyl group, and Rf 2 is an aromatic ring-containing group. In formula (f-1), Rf 1 is preferably a methyl group. 2 is a group containing an aromatic ring, and the aromatic ring of the oxygen atom may be directly bonded or may be bonded via a linking group. The aromatic ring is preferably a benzene ring. The molecular weight of the compound represented by formula (f-1) is preferably 148 to 600.

[0054] A first embodiment of the compound represented by formula (f-1) in the present invention is a (meth)acrylate represented by formula (f-2). Formula (f-2) [ka] (In formula (f-2), Rf 21 is a hydrogen atom or a methyl group, and Rf 22 is a substituent, and nf1 is an integer of 0 to 6.

[0055] In the above formula (f-2), Rf 21 is preferably a methyl group. In the above formula (f-2), Rf 22 is a substituent, and examples thereof include a halogen atom (preferably a chlorine atom, a fluorine atom, or a bromine atom), a hydroxyl group, an alkyl group (preferably an alkyl group having 1 to 5 carbon atoms), an aryl group (preferably a phenyl group), an alkenyl group (preferably an alkenyl group having 2 to 5 carbon atoms), an alkoxy group (preferably an alkoxy group having 1 to 5 carbon atoms), and an aryloxy group (preferably a phenoxy group). When nf1 is 2 or more, a plurality of Rf 22 may be the same or different.

[0056] It is preferable that nf1 is an integer of 5 or less, more preferably an integer of 4 or less, even more preferably an integer of 3 or less, even more preferably an integer of 2 or less, even more preferably an integer of 1 or less, and even more preferably 0.

[0057] A second embodiment of the compound represented by formula (f-1) in the present invention is a (meth)acrylate represented by formula (f-3). Formula (f-3) [ka] (In formula (f-3), Rf 23 is a hydrogen atom or a methyl group, and Rf 24 is an aromatic ring-containing group, and nf2 is an integer of 1 to 4. In the above formula (f-3), Rf 23 is preferably a methyl group. In the above formula (f-3), Rf 24 is an aromatic ring-containing group, and more preferably a group containing one or more benzene rings. It may also have a substituent. In the present invention, (CH2) in formula (f-3) nf2 Based on Rf 24 It is preferable that the aromatic rings contained in are directly linked. Examples of the substituent include a halogen atom (preferably a chlorine atom, a fluorine atom or a bromine atom), a hydroxyl group, an alkyl group (preferably an alkyl group having 1 to 5 carbon atoms), an aryl group (preferably a phenyl group), an alkenyl group (preferably an alkenyl group having 2 to 5 carbon atoms), an alkoxy group (preferably an alkoxy group having 1 to 5 carbon atoms) and an aryloxy group (preferably a phenoxy group). In the above formula (f-3), nf2 is preferably an integer of 1 to 3, more preferably 1 or 2, and even more preferably 1.

[0058] The compound represented by formula (f-3) is more preferably a compound represented by formula (f-4). Formula (f-4) [ka] (In formula (f-4), Rf 25 is a hydrogen atom or a methyl group, nf3 is an integer of 1 to 4, and Rf 26 is a substituent, and Rf 26 At least one of is an aryl group, and nf4 is an integer of 1 to 6.

[0059] In formula (f-4), Rf 25 is preferably a methyl group. In formula (f-4), Rf 26 is a substituent, and examples thereof include a halogen atom (preferably a chlorine atom, a fluorine atom, or a bromine atom), a hydroxyl group, an alkyl group (preferably an alkyl group having 1 to 5 carbon atoms), an aryl group (preferably a phenyl group), an alkenyl group (preferably an alkenyl group having 2 to 5 carbon atoms), an alkoxy group (preferably an alkoxy group having 1 to 5 carbon atoms), and an aryloxy group (preferably a phenoxy group). When nf4 is 2 or more, Rf 26 may be the same or different. Also, Rf 26 At least one of the groups is an aryl group, and preferably one of the groups is an aryl group. The aryl group is preferably a substituted or unsubstituted phenyl group, and more preferably an unsubstituted phenyl group. In formula (f-4), nf3 is an integer of 1 to 4, preferably an integer of 1 to 3, more preferably 1 or 2, and further preferably 1. In formula (f-4), nf4 is an integer of 1 to 6, preferably an integer of 1 to 3, more preferably 1 or 2, and further preferably 1.

[0060] Next, specific examples of the compound represented by formula (f-1) will be described. Specific examples of the compound represented by formula (f-1) include the following compounds. [ka]

[0061] The molecular weight of the compound represented by formula (f-1) is preferably 148-600.

[0062] The content of the compound represented by formula (f-1) in the monomer composition f is 10 to 40% by mass. The lower limit of the content is preferably 15% by mass or more. By making the content equal to or more than the lower limit, the refractive index tends to be further improved. Moreover, the upper limit of the content is preferably 35% by mass or less. The monomer composition f may contain only one type of compound represented by formula (f-1), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0063] <<Other Monomers>> The monomer composition f contains a monomer other than the compound represented by formula (f-1). The other monomer is a monomer copolymerizable with the compound represented by formula (f-1), and examples thereof include (meth)acrylate compounds and vinyl compounds other than the compound represented by formula (f-1), and the compound represented by formula (a-1) described in the monomer composition a is preferred. The preferred range of the other monomer other than the compound represented by formula (f-1) is the same as that of the compound represented by formula (a-1) described in the monomer composition a. The molecular weight of the other monomer is preferably 70-600.

[0064] The content of the other monomer (preferably the compound represented by formula (a-1), more preferably methyl methacrylate) in the monomer composition f is preferably 60 to 90 mass %, more preferably 65 to 85 mass %. In particular, in the monomer composition f, the total amount of the compound represented by formula (f-1) and the compound represented by formula (a-1) (preferably methyl methacrylate) preferably accounts for 98 to 100% by mass of the monomer composition.

[0065] Furthermore, the monomer composition f may contain components such as an antioxidant, an end-capping agent, a catalyst, etc. in addition to the raw material monomers. The total amount of these is usually 1% by mass or less of the total amount of the raw material monomers.

[0066] Next, preferred physical properties of the second embodiment of the other resin will be described.

[0067] The weight average molecular weight of the other resin in the second embodiment is preferably 6,000 or more, more preferably 8,000 or more, and even more preferably 10,000 or more. By making it equal to or more than the above lower limit, impact resistance, toughness and moldability tend to be further improved. In addition, the upper limit of the weight average molecular weight is preferably 200,000 or less, more preferably 175,000 or less, even more preferably 150,000 or less, and may even be 50,000 or less, or 20,000 or less. By making it equal to or less than the above upper limit, flow marks during molding of a multilayer body tend to be more effectively suppressed.

[0068] <Resin blend ratio> Next, the blend ratio of the resin components in the resin composition of the present invention will be described. The resin composition of the present invention contains 25 to 90 parts by mass of copolymer resin (A) and 10 to 75 parts by mass of copolymer resin (B). The first blend form of the resin components in the resin composition of the present invention is a form in which the copolymer resin (A) contains 25 to 90 parts by mass and the copolymer resin (B) contains 10 to 75 parts by mass, and the copolymer resin (A) and the copolymer resin (B) account for 98% or more by mass of the resin components contained in the resin composition. In the first blend form of the resin components, the ratio of the copolymer resin (A) to the copolymer resin (B) is preferably 35 to 85 parts by mass of the copolymer resin (A) and 15 to 65 parts by mass of the copolymer resin (B). The second blend form of the resin components in the resin composition of the present invention is a form that contains 25 to 90 parts by mass of copolymer resin (A) and 10 to 75 parts by mass of copolymer resin (B), and contains other resins at a ratio of more than 0 parts by mass and 30 parts by mass or less relative to 100 parts by mass of the total of copolymer resin (A) and copolymer resin (B). In the second blend form of the resin components, it is preferable to contain 30 to 80 parts by mass (preferably 60 to 80 parts by mass) of copolymer resin (A) and 20 to 70 parts by mass (preferably 20 to 40 parts by mass) of copolymer resin (B), and contain other resins at a ratio of 1 to 25 parts by mass (preferably 3 to 22 parts by mass) relative to 100 parts by mass of the total of copolymer resin (A) and copolymer resin (B). As the other resin, an acrylic resin composed of monomer composition e and / or an acrylic resin composed of monomer composition f are preferable. A particularly preferred example of this embodiment includes an acrylic resin composed of copolymer resin (A), copolymer resin (B), and monomer composition e, and includes 62 to 70 parts by mass of copolymer resin (A) and 38 to 30 parts by mass of copolymer resin (B), and includes 6 to 30 parts by mass of acrylic resin composed of monomer composition e (preferably 6 to 14 parts by mass, more preferably 8 to 12 parts by mass) per 100 parts by mass of the total of copolymer resin (A) and copolymer resin (B). By adopting such a configuration, the pencil hardness tends to be further improved while improving other performances in a well-balanced manner. Furthermore, it is preferable that the ratio of the acrylic resin composed of copolymer resin (A) and monomer composition e, that is, copolymer resin (A) / acrylic resin composed of monomer composition e, is 5.5 to 7.5. By setting it in such a range, the effect of the present invention tends to be more effectively exhibited.

[0069] In the present invention, the total of the copolymer resin (A) and the copolymer resin (B), and further the acrylic resin composed of the monomer composition e and / or the acrylic resin composed of the monomer composition f, which are blended as necessary, preferably accounts for 90% by mass or more of the resin components contained in the resin composition, more preferably 95% by mass or more, and even more preferably 99% by mass or more. The upper limit may be 100% by mass or less of the resin components. In the present invention, the total of the copolymer resin (A) and the copolymer resin (B), and further the acrylic resin composed of the monomer composition e and / or the acrylic resin composed of the monomer composition f, which are blended as necessary, preferably accounts for 90% by mass or more of the resin composition, more preferably 95% by mass or more, and even more preferably 98% by mass or more. The upper limit is preferably 99.99% by mass or less of the resin composition.

[0070] The resin composition of the present invention may contain only one type of copolymer resin (A), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range. The resin composition of the present invention may contain only one type of copolymer resin (B), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range. The resin composition of the present invention may contain only one type of other resin (particularly, an acrylic resin composed of a monomer composition e and / or an acrylic resin composed of a monomer composition f) or may contain two or more types. When two or more types are contained, it is preferable that the total amount is within the above range.

[0071] <Antioxidants> The resin composition of the present invention preferably contains an antioxidant. Examples of the antioxidant include phenol-based antioxidants, amine-based antioxidants, phosphorus-based antioxidants, thioether-based antioxidants, etc. Among them, in the present invention, phosphorus-based antioxidants and phenol-based antioxidants (more preferably hindered phenol-based antioxidants) are preferred, and phosphorus-based antioxidants are even more preferred.

[0072] The phosphorus-based antioxidant is preferably a phosphite-based antioxidant, and more preferably a phosphite-based antioxidant represented by the following formula (1) or (2). [ka] (1) (In formula (1), R11 and R 12 each independently represents an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms. [ka] (In formula (2), R 13 ~R 17 each independently represents a hydrogen atom, an aryl group having 6 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms.

[0073] In the above formula (1), R 11 , R 12 Each of the alkyl groups represented by the following formula (1) is preferably a linear or branched alkyl group having 1 to 10 carbon atoms. 11 , R 12 When is an aryl group, it is preferably an aryl group represented by any one of the following formulae (1-a), (1-b), and (1-c), in which * represents the bonding position.

[0074] [ka] (In formula (1-a), R A each independently represents an alkyl group having 1 to 10 carbon atoms. B each independently represents an alkyl group having 1 to 10 carbon atoms.

[0075] For the hindered phenol-based antioxidant, reference can be made to the descriptions in paragraph 0063 of JP2018-090677A and paragraph 0076 of JP2018-188496A, the contents of which are incorporated herein by reference.

[0076] In addition to the above, the antioxidants can be found in paragraphs 0057 to 0061 of JP2017-031313A, the contents of which are incorporated herein by reference.

[0077] The content of the antioxidant is preferably 0.001 parts by mass or more, more preferably 0.008 parts by mass or more, relative to 100 parts by mass of the resin composition. The upper limit of the content of the antioxidant is preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, even more preferably 0.2 parts by mass or less, even more preferably 0.15 parts by mass or less, even more preferably 0.10 parts by mass or less, and even more preferably 0.08 parts by mass or less, relative to 100 parts by mass of the resin composition.

[0078] The antioxidant may be used alone or in combination of two or more. When two or more antioxidants are used, the total amount is preferably within the above range.

[0079] <Release agent> The resin composition of the present invention preferably contains a release agent. By including a release agent, the winding properties of the film-like or sheet-like flat molded article can be improved. The type of release agent is not particularly limited, but examples thereof include aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, polyethers having a number average molecular weight of 100 to 5,000, and polysiloxane-based silicone oils.

[0080] For details about the release agent, please refer to paragraphs 0035 to 0039 of WO 2015 / 190162, the contents of which are incorporated herein by reference.

[0081] The content of the release agent is preferably 0.001 parts by mass or more, more preferably 0.005 parts by mass or more, and even more preferably 0.008 parts by mass or more, relative to 100 parts by mass of the resin composition. The upper limit is preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, and even more preferably 0.2 parts by mass or less, relative to 100 parts by mass of the resin composition. The release agent may be used alone or in combination of two or more. When two or more types are used, the total amount is preferably within the above range.

[0082] <Other ingredients> In addition to the above-mentioned components, the resin composition of the present invention may contain thermoplastic resins other than those mentioned above, ultraviolet absorbers, heat stabilizers, flame retardants, flame retardant assistants, colorants, antistatic agents, fluorescent brighteners, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, sliding improvers, hue improvers, acid trapping agents, etc. These components may be used alone or in combination of two or more. When contained, the total content of the above components is preferably 0.1 to 5% by mass of the resin composition.

[0083] Next, the characteristics of the resin composition of the present invention will be described. Specifically, the resin composition of the present invention, when molded into a 3 mm thick plate-like molded article, has a haze of preferably 5% or less, more preferably 3% or less, even more preferably 2% or less, even more preferably 1.5% or less, and may be less than 1.0%. The lower limit of the haze is ideally 0%, but practically 0.1% or more. Haze is measured as described in the Examples section below.

[0084] The resin composition of the present invention has a refractive index measured by a polarized light diffraction method of preferably 1.535 or more, more preferably 1.536 or more, and even more preferably 1.540 or more. The upper limit is, for example, preferably 1.590 or less, and may be 1.560 or less. By making the refractive index equal to or greater than the lower limit, for example, the difference in refractive index with the polycarbonate resin substrate can be reduced, and rainbow unevenness can be effectively suppressed. The refractive index is measured as described in the Examples section below.

[0085] The resin composition of the present invention preferably has a glass transition temperature measured by differential scanning calorimetry of 123°C or higher, more preferably 124°C or higher, even more preferably 125°C or higher, and may even be 128°C or higher, or 130°C or higher. By making the glass transition temperature equal to or higher than the lower limit, the heat resistance of the multilayer body tends to be improved. Furthermore, the heat bending moldability tends to be improved. The upper limit of the glass transition temperature is preferably, for example, 180°C or lower. By making the glass transition temperature equal to or lower than the upper limit, bending processing tends to be easier. The glass transition temperature is measured as described in the Examples section below.

[0086] The pencil hardness of the plate-like molded article formed from the resin composition of the present invention is preferably at least F. The upper limit of the pencil hardness is, for example, at most 3H, and even if it is at most 2H, the required performance is satisfied. The pencil hardness is measured as described in the Examples section below.

[0087] The total light transmittance of the flat molded article formed from the resin composition of the present invention is preferably 86.0% or more, more preferably 88.0% or more, and even more preferably 89.0% or more. The upper limit of the total light transmittance is ideally 100%, but practically 95.0% or less. The total light transmittance is measured according to the description in the Examples section below.

[0088] The resin composition of the present invention is subjected to a shear rate test at 240°C and a shear rate of 1220 sec. -1 The melt viscosity measured by is preferably 500 Pa s or less, more preferably 490 Pa s or less, and even more preferably 485 Pa s or less. By keeping the melt viscosity at or below the upper limit, the occurrence of flow marks during molding of the multilayer sheet tends to be more effectively suppressed. The lower limit of the melt viscosity of the resin composition may be 300 Pa·s or more, or may be 320 Pa·s or more, or 340 Pa·s or more. The melt viscosity is measured according to the method described in the Examples section below.

[0089] <Application> The resin composition of the present invention can be used by molding it into, for example, a flat plate-like molded article. Examples of the flat-plate-like molded article include a plate, a film, a sheet, etc. In addition, the flat-plate-like molded article may be included in a multi-layer body laminated on another substrate, etc., as described in detail below. In addition, the flat-plate-like molded article of the present invention may be incorporated into a part of a multi-layer body and then subjected to bending processing or the like. The thickness of the flat molded body is preferably 10 μm or more, more preferably 20 μm or more, even more preferably 50 μm or more, and may be 100 μm or more. By making it above the lower limit, molding becomes easier and the hardness tends to improve. In addition, there is no particular limit to the upper limit of the thickness of the flat molded body, but it is practical to make it 10,000 μm or less. The plate-like molded article of the present invention is molded by injection molding, extrusion molding using a T-die, or the like.

[0090] The present invention also relates to a multilayer body having a substrate and the flat plate-like molded body of the present invention. The thickness of the multilayer body is not particularly limited, but is preferably 20 μm or more. The thickness of the multilayer body is preferably 10,000 μm or less, more preferably 5,000 μm or less, and may be 2,000 μm or less. The multilayer body of the present invention preferably further has a hard coat layer on the flat-shaped molded body and / or the substrate, and more preferably has a hard coat layer on the flat-shaped molded body. Furthermore, the multilayer body of the present invention preferably has a low refractive index layer on the surface opposite to the substrate on the hard coat layer. That is, the multilayer body can be used as an anti-reflective molded body. FIG. 1 is a schematic diagram showing an example of the multilayer body of the present invention used as an anti-reflective molded body, in which, as described above, 1 indicates the substrate, 2 indicates the flat-shaped molded body, 3 indicates the hard coat layer, and 4 indicates the anti-reflective layer. The substrate 1, the flat-shaped molded body 2, and the hard coat layer 3 may have other layers within the scope of the present invention as long as they are laminated in the above order, but it is preferable that they do not have other layers, that is, they are adjacent to each other. The anti-reflective molded body is preferably an anti-reflective sheet.

[0091] Next, the substrate 1 will be described. The type of the substrate 1 is not particularly limited, and any known substrate can be used as long as it satisfies the performance required for the multilayer body of the present invention. Specifically, the substrate preferably contains a resin, and more preferably 90% by mass or more of the substrate is resin. Examples of resins constituting the substrate include polyolefin resins, polyester resins, polycarbonate resins, acrylic resins, polystyrene resins, etc., and preferably contain polycarbonate resins. These may be used alone or may form a composite substrate of two or more types.

[0092] The polycarbonate resin is preferably an aromatic polycarbonate resin, more preferably a bisphenol A type polycarbonate resin. The bisphenol A type polycarbonate resin refers to a resin having a carbonate structural unit derived from bisphenol A and its derivatives, and preferably has a structural unit represented by the following formula (B-1). In the formula, * represents a bond position. [ka] In formula (B-1), X 1represents the following structure: [ka] R 5 and R 6 is an alkyl group or a hydrogen atom, and it is preferable that at least one of them is a methyl group, and it is more preferable that both of them are methyl groups. Formula (B-1) is preferably represented by the following formula (B-2). [ka]

[0093] The content of the structural unit represented by formula (B-1) in the bisphenol A polycarbonate resin is preferably 70 mol% or more, more preferably 80 mol% or more, and even more preferably 90 mol% or more of all structural units excluding both ends. The upper limit is not particularly limited, and 100 mol% may be the structural unit represented by formula (B-1). Particularly preferred bisphenol A polycarbonate resins include resins in which all structural units except both ends are substantially composed of structural units of formula (B-1). Here, substantially all structural units excluding both ends means 99.0 mol% or more of all structural units excluding both ends, preferably 99.5 mol% or more, and more preferably 99.9 mol% or more.

[0094] The terminal structure contained in the bisphenol A polycarbonate resin is preferably a terminal structure represented by formula (T). By having such a terminal structure, the glass transition temperature can be lowered. Formula (T) [ka] In formula (T), R T1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 36 carbon atoms, R T2represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms; and nt is an integer of 0 to 4. In the present invention, it is preferable that 50 mol % or more of the bisphenol A type polycarbonate resin has at least one of the above terminal structures.

[0095] R T1 is preferably an alkyl or alkenyl group having 12 or more carbon atoms, and more preferably an alkyl or alkenyl group having 14 or more carbon atoms. T1 R is preferably an alkyl or alkenyl group having 22 or less carbon atoms, and more preferably an alkyl or alkenyl group having 18 or less carbon atoms. T1 is preferably an alkyl group. R T2 is preferably a fluorine atom, a chlorine atom, a methyl group, an ethyl group, or a phenyl group, and more preferably a fluorine atom, a chlorine atom, or a methyl group. nt is preferably an integer of 0 to 2, more preferably 0 or 1, and even more preferably 0.

[0096] The terminal structure represented by formula (t) can be added to polycarbonate by using a terminal blocking agent such as parahydroxybenzoic acid hexadecyl ester. For details, refer to paragraphs 0022 to 0030 of JP2019-002023A, the contents of which are incorporated herein by reference.

[0097] The bisphenol A polycarbonate resin may also have other structural units than the carbonate structural units derived from bisphenol A and its derivatives. Examples of dihydroxy compounds constituting such other structural units include the aromatic dihydroxy compounds described in paragraph 0014 of JP 2018-154819 A, the contents of which are incorporated herein by reference.

[0098] The method for producing the bisphenol A polycarbonate resin is not particularly limited, and any method can be used, such as interfacial polymerization, melt transesterification, pyridine method, ring-opening polymerization of a cyclic carbonate compound, and solid-phase transesterification of a prepolymer. For details of the polycarbonate resin, please refer to the descriptions in paragraphs 0040 to 0073 of JP 2019-035001 A and paragraphs 0016 to 0043 of JP 2018-103518 A, the contents of which are incorporated herein by reference.

[0099] The substrate 1 may be a single layer or a multilayer.

[0100] The thickness of the substrate 1 is not particularly limited, but is preferably 30 μm or more, more preferably 35 μm or more, even more preferably 40 μm or more, and even more preferably 50 μm or more. The thickness of the substrate 1 is preferably 5,000 μm or less, more preferably 3,000 μm or less, and may be 1,000 μm or less.

[0101] The refractive index of the substrate 1 is, for example, preferably 1.610 or less, more preferably 1.600 or less. The lower limit is preferably as low as possible, but in the present invention, by using the above-mentioned plate-like molded body, it is possible to use a refractive index of, for example, 1.500 or more, further 1.510 or more, particularly 1.520 or more. In the present invention, the refractive index difference between the substrate 1 and the flat plate-like molded body 2 is preferably 0.050 or less. By making the refractive index difference in this range, rainbow unevenness can be more effectively suppressed. The lower limit of the refractive index difference is ideally 0, but even if it is, for example, 0.010 or more, or even 0.030 or more, the required performance is sufficiently satisfied. The glass transition temperature of the substrate 1 as measured by differential scanning calorimetry (DSC) is preferably 70 to 180° C., more preferably 100 to 160° C., and even more preferably 110 to 140° C. By setting the glass transition temperature within this range, excellent hot bending processability is achieved.

[0102] Next, the hard coat layer 3 will be described. The hard coat layer 3 is provided mainly for the purpose of improving scratch resistance. The hard coat layer preferably exhibits a hardness of "H" or more in the pencil hardness test specified in JIS K5600-5-4:1999. The type of the hard coat layer 3 is not particularly limited, and it is preferably formed by a hard coat treatment applied to the surface of the flat plate-like molded body 2. Specifically, it is preferable to laminate the hard coat layer 3 by applying a hard coat material that can be cured by heat or active energy rays, and then curing the applied material. An example of a coating material that is cured using active energy rays is a resin composition consisting of one or more monofunctional or polyfunctional (meth)acrylate monomers or oligomers, more preferably a resin composition containing a urethane (meth)acrylate oligomer, etc. It is preferable to add a photopolymerization initiator as a curing catalyst to these resin compositions. For the hard coat layer 3, the descriptions in paragraphs 0045 to 0055 of JP 2013-020130 A, paragraphs 0073 to 0076 of JP 2018-103518 A, and paragraphs 0062 to 0082 of JP 2017-213771 A can be referred to, the contents of which are incorporated herein by reference. Examples of thermosetting resin coatings include polyorganosiloxane-based and crosslinked acrylic-based coatings. Some of these resin compositions are commercially available as hard-coating agents for acrylic resins or polycarbonates, and can be selected appropriately taking into account suitability for the coating line.

[0103] The hard coat layer 3 may be a single layer or a multilayer.

[0104] The thickness of the hard coat layer 3 is not particularly limited, but is preferably 1 to 10 μm, more preferably 2 to 8 μm, and further preferably 3 to 7 μm.

[0105] The refractive index of the hard coat layer 3 is, for example, preferably less than 1.550, and more preferably 1.545 or less. The lower limit is preferably 1.450 or more, more preferably 1.470 or more, and particularly preferably 1.490 or more. In the present invention, the refractive index difference between the hard coat layer 3 and the flat plate-like molded body 2 is preferably 0.050 or less. By making the refractive index difference in this range, rainbow unevenness can be more effectively suppressed. The lower limit of the refractive index difference is ideally 0, but even if it is, for example, 0.010 or more, or even 0.030 or more, the required performance is sufficiently satisfied.

[0106] Next, the antireflection layer 4 will be described. The antireflection layer 4 may be a single layer having a low refractive index (only a low refractive index layer) or a multilayer in which low refractive index layers and high refractive index layers are alternately laminated. By laminating such an antireflection layer 4 on a multilayer body, it can be used as an antireflection molded body. The low refractive index layer is preferably disposed on the outermost side of the antireflection layer 4 in order to exert an antireflection function. The low refractive index layer is not particularly limited in type, but as an example, it is preferably formed by curing and polymerizing a resin material containing fluorine-containing urethane acrylate and (meth)acrylate. The low refractive index layer may also contain a member for lowering the refractive index. As the member for lowering the refractive index, silica, metal fluoride fine particles, etc. are preferable, and hollow silica is particularly preferable. The refractive index of the low refractive index layer is usually lower than those of the adjacent substrate, tabular molded product, hard coat layer, and high refractive index layer. The refractive index of the low refractive index layer is preferably 1.31 to 1.40, and more preferably 1.32 to 1.39. The high refractive index layer is not particularly limited in type, but as an example, it is preferably formed by curing and polymerizing a resin material containing a mixture of urethane (meth)acrylate and (meth)acrylate obtained by dehydration condensation reaction of three components, fluorene diol, isocyanate, and (meth)acrylate. The high refractive index layer may also contain a member for increasing the refractive index. As the member for increasing the refractive index, a metal oxide such as titanium oxide or zirconium oxide is preferable, and zirconium oxide is particularly preferable. The refractive index of the high refractive index layer is higher than those of the adjacent base layer, tabular molded product (layer), hard coat layer, and low refractive index layer. The refractive index of the high refractive index layer is preferably 1.68 to 1.75, and more preferably 1.69 to 1.74.

[0107] The multilayer body of the present invention may have other layers in addition to those described above. Specific examples include an adhesive layer, a pressure-sensitive adhesive layer, and an antifouling layer.

[0108] The multilayer body may be subjected to at least one of anti-fingerprint treatment, anti-glare treatment, weather resistance treatment, antistatic treatment, anti-soiling treatment, and anti-blocking treatment on at least one surface. An example of the outermost surface of the multilayer body in this case is a hard coat layer. The anti-blocking treatment refers to a treatment that allows films to be easily peeled off even if they are in close contact with each other, and examples of the anti-blocking treatment include adding an anti-blocking agent and providing unevenness on the surface of the multilayer body. The multilayer body of the present invention can be formed by using a main extruder that extrudes a substrate such as a polycarbonate resin and a sub-extruder that extrudes the resin composition of the present invention, melting the resins under the conditions for each resin used, introducing them into an extrusion die, laminating them inside the die and forming them into a sheet, or forming them into a sheet and then laminating them, thereby forming the multilayer body.

[0109] The multilayer body of the present invention can be suitably used for optical parts, design products, anti-reflection molded articles, and the like. The multilayer body of the present invention is preferably used for display devices, electric and electronic devices, OA devices, portable information terminals, machine parts, home appliances, vehicle parts, various containers, lighting equipment, and other parts. Among these, it is particularly preferably used for housings of various displays, electric and electronic devices, OA devices, portable information terminals, and home appliances, lighting equipment, and vehicle parts (particularly, vehicle interior parts), surface films of smartphones and touch panels, optical materials, and optical disks. In particular, the molded body of the present invention is preferably used as a sensor film for touch panels and an anti-reflection molded body for various displays. The multilayer body of the present invention also has excellent resistance to thermal bending, and is therefore suitable for applications having curved portions. For example, it is preferably used in multilayer bodies having portions with a radius of curvature of 50 mmR or less (preferably a radius of curvature of 40 to 50 mmR). EXAMPLES

[0110] The present invention will be described in more detail below with reference to examples. The materials, amounts, ratios, processing contents, processing procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0111] <Raw materials> Copolymer resin (A) (A1) Daicel-Evonik, acrylic resin, PLEXIGLAS hw55, mass ratio of styrene:maleic anhydride:methyl methacrylate (MMA) = 16% by mass: 8% by mass: 76% by mass, glass transition temperature (Tg): 120°C, weight average molecular weight: 109,000, refractive index 1.530, pencil hardness H

[0112] (A2-1) Nippon Shokubai, acrylic resin, PML203, mass ratio of styrene:N-phenylmaleimide:N-cyclohexylmaleimide:MMA=6% by mass:19% by mass:4% by mass:71% by mass, Tg: 135°C, weight average molecular weight: 189,000, refractive index: 1.533, pencil hardness H (A2-2) Asahi Kasei Chemicals Corporation, acrylic resin, Delpet PM120N, mass ratio of styrene:N-phenylmaleimide:MMA = 4 mass%:15 mass%:81 mass%, Tg: 124°C, weight average molecular weight: 121,000, refractive index: 1.531, pencil hardness: 2H

[0113] Copolymer resin (B) and comparative copolymer resin (B') (B1) Polyscope, aromatic vinyl resin, XIBOND160, styrene:maleic anhydride = 78% by mass: 22% by mass, Tg: 143°C, weight average molecular weight: 69,500, refractive index: 1.580, pencil hardness: HB (B1') (for comparison) Polyscope, aromatic vinyl resin, XIBOND140, styrene:maleic anhydride = 85% by mass: 15% by mass, Tg: 129°C, weight average molecular weight: 134,000, refractive index: 1.591, pencil hardness: HB (B2') (for comparison) Aromatic vinyl resin, XIBOND180, manufactured by Polyscope, styrene:maleic anhydride = 67% by mass: 33% by mass, Tg: 157°C, weight average molecular weight: 50,100, refractive index: 1.575, pencil hardness: HB

[0114] Other resins (C) Denka Company, R100, mass ratio of styrene:maleic anhydride:MMA = 65 mass%:15 mass%:20 mass%, Tg: 123°C, weight average molecular weight: 155,000

[0115] (D1) Toyo Styrene Co., Ltd., acrylic resin, MS300, styrene:MMA=70% by mass:30% by mass, Tg: 95°C, weight average molecular weight: 190,000 (D2) Toyo Styrene Co., Ltd., acrylic resin, MS500, styrene:MMA=50% by mass:50% by mass, Tg: 94°C, weight average molecular weight: 160,000 (D3) Toyo Styrene Co., Ltd., acrylic resin, MS750, styrene:MMA=25% by mass:75% by mass, Tg:99°C, weight average molecular weight:152,000

[0116] (E1) Arkema, ALTUGLAS (registered trademark) V020, methyl methacrylate:methyl acrylate = 96.9% by mass: 3.1% by mass, Tg: 109°C, weight average molecular weight: 127,000, pencil hardness 2H (E2) Arkema, ALTUGLAS (registered trademark) V040, methyl methacrylate:methyl acrylate=98.5% by mass:1.5% by mass, Tg: 110° C., weight average molecular weight: 84,100, pencil hardness 2H

[0117] (F1) Mitsubishi Chemical Corporation, acrylic resin, H-880, methyl methacrylate:phenyl methacrylate = 80% by mass: 20% by mass, Tg: 89°C, weight average molecular weight 15,000 (F2) Mitsubishi Gas Chemical Company, acrylic resin, MODAP BP2010R, methyl methacrylate: biphenyl-4-ylmethyl methacrylate = 70% by mass: 30% by mass, Tg: 82°C, weight average molecular weight 12,600

[0118] Antioxidants (G) ADEKA STAB PEP-36, the following compound, where tBu represents a t-butyl group. [ka]

[0119] Release Agent (H) Riken Vitamin Co., Ltd., Rikemal S-100A (glycerin monostearate)

[0120] <Measurement of glass transition temperature (Tg)> The glass transition temperature (Tg) of each resin and resin composition was measured by carrying out two cycles of heating and cooling according to the differential scanning calorimetry (DSC) measurement conditions below, and measuring the glass transition temperature during the second heating cycle. The starting glass transition temperature is the intersection point of a straight line extending the low-temperature side baseline to the high-temperature side and a tangent to the inflection point, the ending glass transition temperature is the intersection point of a straight line extending the high-temperature side baseline to the low-temperature side and a tangent to the inflection point, and the midpoint between the starting glass transition temperature and the ending glass transition temperature is the glass transition temperature. In the present invention, the starting glass transition temperature is adopted as the glass transition temperature (Tg). Measurement starting temperature: 30°C, heating rate: 10°C / min, final temperature: 250°C, heating rate: 20°C / min. The measurement was performed using a differential scanning calorimeter (DSC, Hitachi High-Tech Science Corporation, "DSC7020").

[0121] <Method for measuring weight average molecular weight> The weight average molecular weight (Mw) of each resin was measured by gel permeation chromatography. Specifically, the measurement was performed as follows. The gel permeation chromatography apparatus used was an LC-20AD system (manufactured by Shimadzu Corporation), and an LF-804 (manufactured by Shodex Corporation) was connected as the column. The column temperature was set to 40°C. The detector used was an RID-10A (manufactured by Shimadzu Corporation) RI detector. Chloroform was used as the eluent, and a calibration curve was created using standard polystyrene (manufactured by Tosoh Corporation). If the above-mentioned gel permeation chromatography apparatus, column, and detector are difficult to obtain, measurement can be performed using other apparatus having equivalent performance.

[0122] <Pencil hardness of resin> The resin was molded into a 3 mm thick plate-like molded product in the same manner as described below in <Production of 3 mm thick plate-like molded product>, and the pencil hardness of the obtained plate-like molded product was measured using a pencil hardness tester under a load of 750 g in accordance with JIS K5600-5-4:1999. The evaluation was performed by five experts and judged by majority vote.

[0123] <Measurement of the refractive index of resin> The refractive index was measured by a polarized light diffraction method. Specifically, the resin was molded into a 3 mm-thick plate-like molded product in the same manner as described below in <Production of a 3 mm-thick plate-like molded product>, and the refractive index of light with a wavelength of 589 nm was determined for the obtained plate-like molded product using an automatic thin film measuring device. In measuring the refractive index, a spectroscopic ellipsometer Auto SE (manufactured by HORIBA) was used as an automatic thin film measuring device.

[0124] Examples 1 to 16, Comparative Examples 1 to 20 <Production of resin pellets (resin composition)> The above-mentioned components were weighed out so as to obtain the ratios (parts by mass) shown in Tables 1 to 5. After mixing in a tumbler for 15 minutes, the mixture was melt-kneaded at a cylinder temperature of 270°C in a vented twin-screw extruder ("TEX30α" manufactured by The Japan Steel Works, Ltd.) having a screw diameter of 32 mm, and pellets (resin composition) were obtained by strand cutting.

[0125] <Pellet appearance> The appearance of the obtained pellets was visually evaluated by five experts, and judged by majority vote. A: It was transparent. B: Other than A above. For example, no pellets were obtained, or the obtained pellets were translucent or cloudy, etc. In addition, the pellets (resin compositions) that were rated "A" were further evaluated as follows.

[0126] <Production of 3 mm thick flat plate-shaped bodies> The obtained pellets (resin composition) were melt-kneaded at a cylinder temperature of 260°C using a vented twin-screw injection molding machine (Sodick's "PE-100", intermeshing co-rotating twin screws with a diameter of 29 mm, plunger diameter of 28 mm) and molded into a flat plate-shaped molded body (100 x 100 x 3 mm) at a mold temperature of 40°C.

[0127] <Measurement of total light transmittance and haze> The total light transmittance (%) and haze (%) of the obtained tabular molded product were measured using a haze meter under conditions of a D65 light source and a 10° visual field. The haze meter used was "HM-150" manufactured by Murakami Color Research Laboratory.

[0128] <Refractive index measurement> The refractive index was measured by a polarized light diffraction method. Specifically, the refractive index of the plate-like molded product obtained above was determined at a wavelength of 589 nm using an automatic thin film measuring device. In measuring the refractive index, a spectroscopic ellipsometer Auto SE (manufactured by HORIBA) was used as an automatic thin film measuring device.

[0129] <Measurement of pencil hardness> The pencil hardness of the obtained plate-like molded product was measured with a pencil hardness tester under a load of 750 g in accordance with JIS K5600-5-4: 1999. The evaluation was carried out by five experts and judged by majority vote.

[0130] <Melt Viscosity Measurement> The melt viscosity of the pellets (resin composition) obtained above was measured. Specifically, the pellets were pre-dried at 80°C for 3 hours, and then the melt viscosity was measured using a capillograph. The measurement was performed at a temperature of 240°C, a capillary length of 10 mm, a capillary diameter of 1 mm, a furnace diameter of 9.55 mm, and a shear rate of 1220 s -1 The experiment was carried out under the following conditions. The capillograph used was a Capillograph 1D PMD-C manufactured by Toyo Seiki Seisakusho Co., Ltd.

[0131] <Seat manufacturing> The pellets (resin composition) obtained above were used to produce a sheet. A resin multilayer body was molded using a multilayer extrusion device having a single screw extruder with a shaft diameter of 32 mm, a single screw extruder with a shaft diameter of 65 mm, a feed block connected to all the extruders, a multilayer extruder having a T-die with a width of 650 mm connected to the feed block, and a multi-manifold die connected to each extruder. The pellets (resin composition) obtained above were introduced into the single screw extruder with a shaft diameter of 32 mm, and extruded under the conditions of a cylinder temperature of 250°C and a discharge rate of 3.6 kg / h. In addition, polycarbonate resin (manufactured by Mitsubishi Engineering Plastics Corporation, product name: Iupilon E-2000, weight average molecular weight: 52,800) was continuously introduced into the single screw extruder with a shaft diameter of 65 mm, and extruded at a cylinder temperature of 280°C and a discharge rate of 32.4 kg / h. The feed block connected to all the extruders was equipped with a two-type two-layer distribution pin, and the pellets obtained above and polycarbonate resin were introduced and laminated at a temperature of 270°C. The extruded material was extruded into a sheet shape through a T-die connected to the upstream at a temperature of 270°C, and cooled while transferring a mirror surface through three mirror-finishing rolls whose temperatures were set at 130°C, 140°C, and 180°C from the upstream side, to obtain a multilayer body of a sheet formed from the pellets (resin composition) and a sheet formed from the polycarbonate resin. The overall thickness of the central part of the obtained multilayer body was 1,000 μm, and the thickness of the surface layer (sheet formed from the pellets (resin composition)) was 100 μm.

[0132] <Flow mark appearance> When the pellets (resin composition) were molded into a sheet, the presence or absence of flow marks was visually confirmed. The evaluation was carried out by five experts and judged by majority vote. A: No flow marks were observed. B: Flow marks were observed.

[0133] <Heat bending property (heat press molding processability)> For the multilayer body obtained above, a convex (male) mold and a concave (female) mold with a radius of curvature of 50 mmR were prepared. The multilayer body was preheated at 90°C for 1 minute before processing, placed in the mold so that the sheet side formed from the resin composition was convex, pressed at a mold temperature of 120°C for 3 minutes, and naturally cooled to produce a hot press molded body. The cracks in the bent portions of the above hot press molded products were visually evaluated. The evaluation was carried out by five experts and judged by majority vote. A: No cracks were found in the bent parts of the hot press molded body. B: Cracks were found in the bent parts of the hot press molded body.

[0134] <Heat bending property after hard coat application (heat press molding processability)> A paint containing 60 parts by mass of a hexafunctional urethane acrylate oligomer (product name: U6HA, manufactured by Shin-Nakamura Chemical Co., Ltd.), 35 parts by mass of PEG200# diacrylate (product name: 4EG-A, manufactured by Kyoeisha Chemical Co., Ltd.), and 5 parts by mass of an oligomer containing fluorine-containing groups, hydrophilic groups, lipophilic groups, and UV-reactive groups (product name: RS-90, manufactured by DIC Corporation) and 1% by mass of a photopolymerization initiator (product name: I-184 [compound name: 1-hydroxycyclohexyl phenyl ketone] manufactured by BASF Ltd.) was applied to the surface layer of the resin laminate (the surface of the pellets (resin composition)) using a bar coater, and then the paint was heated at 300° C. for 24 hours at 40° C. for 1 hour. 2 ) for 5 seconds to cure the hard coat, and a hard coat layer was laminated. The film thickness of the hard coat was 6 μm. For the multilayer body with the hard coat obtained above, a convex (male) and concave (female) mold with a curvature radius of 50 mmR was prepared. The multilayer body was preheated at 90° C. for 1 minute before processing, and placed in the mold so that the sheet side formed from the resin composition was convex, pressed at a mold temperature of 120° C. for 3 minutes, and naturally cooled to prepare a hot press molded body. The cracks in the bent portions of the above hot press molded products were visually evaluated. The evaluation was carried out by five experts and judged by majority vote. A: No cracks were found in the bent parts of the hot press molded body. B: Cracks were found in the bent parts of the hot press molded body.

[0135] <Interference fringes> A black tape (black vinyl tape, model number 117BLA, manufactured by 3M Japan) was attached to the layer side formed from polycarbonate resin of a multi-layered body of a sheet formed from pellets (resin composition) and a sheet formed from polycarbonate resin, and a three-wavelength fluorescent lamp (Technica Inverter Light 60 AL-60231, Ltd.) was irradiated from the layer side formed from polycarbonate resin to evaluate the presence or absence of interference fringes. The evaluation was performed by five experts and judged by majority vote. A: No interference fringes were visible or the interference fringes were weak. B: Other than A above, interference fringes were strongly visible, etc.

[0136] <Overall rating> The multilayer body obtained above was comprehensively evaluated. The evaluation was carried out by five experts and judged by majority vote. A: It is at a practical level. B: Other than A above. For example, a multilayer body was not produced because the level was beyond the practical level, pellets were not obtained, or the obtained pellets were translucent or cloudy.

[0137] [Table 1]

[0138] [Table 2]

[0139] [Table 3]

[0140] [Table 4]

[0141] [Table 5]

[0142] [Table 6]

[0143] [Table 7] [Explanation of symbols]

[0144] 1 Base material 2 Flat plate shaped body 3 Hard coat layer 4 Anti-reflection layer

Claims

1. 37 to 96% by mass of a compound represented by formula (a-1); 1 to 60% by mass of an aromatic vinyl compound; 25 to 90 parts by mass of a copolymer resin (A) composed of a monomer composition a containing 3 to 62% by mass of a maleimide compound; A resin composition comprising 10 to 75 parts by mass of a copolymer resin (B) composed of a monomer composition (b) containing 73 to 83% by mass of an aromatic vinyl compound and 17 to 27% by mass of an unsaturated dicarboxylic acid anhydride. Formula (a-1) 【Chemistry 1】 (In formula (a-1), Ra １ is a hydrogen atom or a methyl group, and Ra ２ is an aliphatic group.

2. The resin composition was subjected to 240° C. for 1220 seconds. －１ The resin composition according to claim 1, wherein the melt viscosity at a shear rate of 1000 Pa·s or less is 500 Pa·s or less.

3. Further, at least one of an acrylic resin constituted by a monomer composition e (excluding those corresponding to the copolymer resin (A)) and an acrylic resin constituted by a monomer composition f is contained in a ratio of more than 0 part by mass and not more than 30 parts by mass per 100 parts by mass of the total of the copolymer resin (A) and the copolymer resin (B), The monomer composition e contains 70 to 100% by mass of a compound represented by formula (e), and the monomer composition f contains 10 to 40% by mass of a compound represented by formula (f-1). The resin composition according to claim 1 or 2. Formula (e) 【Chemistry 2】 (In formula (e), Re １ is a hydrogen atom or a methyl group, Re ２ is an aliphatic group. Formula (f-1) 【Chemistry 3】 (In formula (f-1), Rf １ is a hydrogen atom or a methyl group, Rf ２ is an aromatic ring-containing group.

4. The resin composition according to claim 3, comprising 62 to 70 parts by mass of copolymer resin (A) and 38 to 30 parts by mass of copolymer resin (B), and comprising 6 to 30 parts by mass of an acrylic resin constituted by monomer composition e per 100 parts by mass of the total of copolymer resin (A) and copolymer resin (B).

5. The resin composition according to any one of claims 1 to 4, wherein the haze of the resin composition when molded into a 3 mm thick plate-like molded article is 5% or less.

6. The resin composition according to any one of claims 1 to 5, wherein the resin composition has a refractive index of 1.535 or more as measured by a polarized light diffraction method.

7. The resin composition according to any one of claims 1 to 6, which has a glass transition temperature of 123°C or higher as measured by differential scanning calorimetry.

8. The resin composition according to any one of claims 1 to 7, wherein a pencil hardness of a plate-like molded article formed from the resin composition is F or more.

9. The resin composition according to any one of claims 1 to 8, wherein the copolymer resin (B) has a weight average molecular weight of 100,000 or less.

10. The resin composition according to any one of claims 1 to 9, wherein the copolymer resin (B) has a refractive index of 1.570 or more as measured by a polarized light diffraction method.

11. The resin composition according to any one of claims 1 to 10, further comprising at least one of an antioxidant and a release agent.

12. The resin composition according to claim 11, wherein the content of the antioxidant is 0.001 to 0.5 parts by mass per 100 parts by mass of the resin composition.

13. The resin composition according to claim 11 or 12, wherein the content of the release agent is 0.001 to 0.5 parts by mass per 100 parts by mass of the resin composition.

14. A flat plate-like molded product formed from the resin composition according to any one of claims 1 to 13.

15. A multilayer body having a substrate and the flat plate-like molded body according to claim 14.

16. The multilayer body according to claim 15, wherein the thickness of the multilayer body is from 20 to 10,000 μm.

17. 17. The multilayer body of claim 15 or 16, wherein the substrate comprises a polycarbonate resin.

18. The multilayer body according to any one of claims 15 to 17, having a portion with a radius of curvature of 50 mmR or less.

19. The multilayer body according to any one of claims 15 to 18, further comprising a hard coat layer on the flat plate-like molded body and / or the substrate.

20. The multilayer body according to claim 19 , further comprising an anti-reflective layer on the hard coat layer.

21. The multilayer body according to any one of claims 15 to 20, further comprising at least one of an anti-fingerprint treatment, an anti-glare treatment, a weather resistance treatment, an antistatic treatment, an anti-soiling treatment, and an anti-blocking treatment on at least one surface of the multilayer body.

22. An anti-reflective molding comprising the multilayer body according to any one of claims 15 to 21.

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