Multilayer body, molded article, and method for manufacturing multilayer body

Abstract

To provide: a multilayer body having high transparency, excellent shatterproof properties and excellent visibility; a molded article: and a method for producing a multilayer body.SOLUTION: There is provided a multilayer body which has a base material formed from a resin composition comprising a polycarbonate resin containing a constituent unit represented by formula (1), other thermoplastic resin other than the polycarbonate resin containing a constituent unit represented by formula (1) and a glass filler and an outer film on at least one of the outer surfaces of the base material, wherein the difference in refractive indices between a thermoplastic resin component and the glass filler contained in the resin composition is 0.0150 or less. Wherein, R1 represents a methyl group.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a multilayer body, a molded article, and a method for producing a multilayer body. [Background technology]

[0002] Polycarbonate resin has excellent mechanical strength, heat resistance, transparency, etc., and is therefore widely used as an engineering plastic in a variety of fields, including electrical and electronic equipment and the automotive industry. Polycarbonate resins are widely used in various fields, including as plastic glass. However, as plastic glass, they tend to have inferior rigidity compared to conventional inorganic glasses. To overcome this drawback, glass-reinforced polycarbonate resin compositions containing glass fillers have been investigated.

[0003] Meanwhile, insert molding of a multilayer body of polycarbonate resin and other films has been investigated (Patent Document 1, Patent Document 2). Specifically, a method has been investigated in which a film is loaded into a mold, and then a resin composition containing polycarbonate resin is injected to produce a multilayer body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-165017 [Patent Document 2] Japanese Patent Application Publication No. 05-310956 Summary of the Invention [Problem to be solved by the invention]

[0005] In a molded article obtained by injection molding a resin composition in which a glass filler is blended with a polycarbonate resin, the glass filler tends to float to the surface of the molded article. This floating of the glass filler on the surface leads to a lack of surface smoothness of the molded article, and parallel light passing through the molded article is scattered on the surface of the molded article, which tends to reduce visibility. In addition, a molded article obtained by injection molding a resin composition in which a glass filler is blended with a polycarbonate resin also has the problem of being easily shattered when subjected to a strong impact. Therefore, the present inventors investigated molding a multilayer body by loading an outer film into a mold and injecting a molten resin composition containing a polycarbonate resin and a glass filler into the mold. In this way, by providing an insert film (outer film) on the surface of a substrate formed from a resin composition containing a polycarbonate resin and a glass filler, shatter resistance upon impact can be expected. Furthermore, it is expected that the glass filler will not be lifted to the surface of the multilayer body. To further improve the transparency of the multilayer body, the present inventors investigated using a bisphenol C polycarbonate resin as the polycarbonate resin. Because bisphenol C polycarbonate resin has inherently high fluidity, it can increase the fluidity of the resin composition and allow the thermoplastic resin component to be sufficiently filled around the glass filler. Increasing the filling rate in this way is expected to improve the transparency of the multilayer body. However, the bisphenol C polycarbonate resin has a large refractive index difference from the glass filler. Therefore, it was found that transparency is inferior from this perspective. The present invention aims to solve these problems and to provide a multilayer body, a molded article, and a method for producing a multilayer body that have high transparency, excellent shatter resistance, and excellent visibility. [Means for solving the problem]

[0006] In light of the above-mentioned problems, the present inventors have conducted research and found that the above-mentioned problems can be solved by blending another thermoplastic resin in addition to a specific polycarbonate resin such as a bisphenol C polycarbonate resin and a glass filler into the resin composition that forms the substrate, thereby reducing the difference in refractive index between the thermoplastic resin component and the glass filler contained in the resin composition. Specifically, the above problems were solved by the following means. <1> A multilayer body having a substrate formed from a resin composition containing a polycarbonate resin containing a structural unit represented by formula (1), a thermoplastic resin other than the polycarbonate resin containing the structural unit represented by formula (1), and a glass filler, and an outer film on at least one of the outer surfaces of the substrate, wherein the difference in refractive index between the thermoplastic resin component contained in the resin composition and the glass filler is 0.0150 or less. Formula (1) [ka] (In formula (1), R 1 represents a methyl group, and R 2 represents a hydrogen atom or a methyl group, and X 1 represents one of the following formulas: [ka] R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent. <2> The polycarbonate resin further contains a structural unit represented by formula (2): <1> The multilayer body according to claim 1. Formula (2) [ka] (In formula (2), X 2 represents one of the following formulas: [ka] R 3 and R4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent. <3> The refractive index of the other thermoplastic resin is 1.4900 to 1.5500. <1> or <2> The multilayer body according to claim 1. <4> In the polycarbonate resin, the proportion of the structural unit represented by formula (1) is 5 mass% or more. <1> ~ <3> 10. The multilayer body according to any one of the preceding items. <5> The other thermoplastic resin includes a (meth)acrylate polymer. <1> ~ <4> 10. The multilayer body according to any one of the preceding items. <6> The (meth)acrylate polymer contains an aromatic (meth)acrylate structural unit (b1). <5> The multilayer body according to claim 1. <7> the (meth)acrylate polymer contains an aromatic (meth)acrylate structural unit (b1) and a methyl methacrylate structural unit (b2), and the mass ratio thereof (b1 / b2) is 5 to 50 / 50 to 95; <5> The multilayer body according to claim 1. <8> The glass filler comprises glass fibers having a flat cross section. <1> ~ <7> 10. The multilayer body according to any one of the preceding items. <9> the outer film includes a layer comprising a polycarbonate resin; <1> ~ <8> 10. The multilayer body according to any one of the preceding items. <10> the outer film includes a layer having a pencil hardness higher than that of the layer including the polycarbonate resin; <9> The multilayer body according to claim 1. <11> The outer film includes a layer containing a (meth)acrylic polymer. <1> ~ <10> 10. The multilayer body according to any one of the preceding items. <12> The outer film includes a hard coat layer. <1> ~ <11> 10. The multilayer body according to any one of the preceding items. <13> An outer film is provided on each of the outer surfaces of the substrate. <1> ~ <12> 10. The multilayer body according to any one of the preceding items. <14> <1> ~ <13> A molded article comprising the multilayer body according to any one of the above. <15> The molded article is a display part, a mobile information terminal part, a household electrical appliance, or an indoor furniture item. <14> The molded article according to claim 1. <16> Injecting a melt of the resin composition into a mold loaded with an outer film to perform injection molding. <1> ~ <13> 10. A method for producing a multilayer body according to any one of the above. <17> the outer film has a layer containing a polycarbonate resin; <16> A method for producing a multilayer body according to claim 1. <18> the outer film has a layer having a pencil hardness higher than that of the layer containing the polycarbonate resin, and the outer film is loaded so that the layer having the higher pencil hardness is in contact with the mold; <17> A method for producing a multilayer body according to claim 1. <19> the outer film has a layer containing a (meth)acrylic polymer, and the outer film is loaded so that the layer containing the (meth)acrylic polymer comes into contact with the mold; <16> or <17> A method for producing a multilayer body according to claim 1. <20> The outer film has a hard coat layer, and the outer film is loaded so that the hard coat layer comes into contact with the mold. <16> or <17> A method for producing a multilayer body according to claim 1. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a multilayer body, a molded article, and a method for producing a multilayer body that have high transparency, excellent shatterproof properties, and excellent visibility. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing an example of a layer structure of a multilayer body of the present invention. [Figure 2] 1 is a cross-sectional view showing an example of a layer structure of an outer film according to the present invention. [Figure 3] 1 is a schematic diagram illustrating a process of molding the multilayer body of the present invention by insert molding. [Figure 4] FIG. 2 is a schematic diagram showing a method of a DuPont impact test in the examples. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only this embodiment. In this specification, the symbol "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, when a notation does not specify whether they are substituted or unsubstituted, it includes both groups (atomic groups) that have no substituents and groups (atomic groups) that have substituents. For example, the term "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 this specification, when a notation does not specify whether they are substituted or unsubstituted, it is preferable that they be unsubstituted. In this specification, the term "process" includes not only an independent process but also a process that cannot be clearly distinguished from other processes as long as the intended effect of the process is achieved. The multilayer body in this specification is intended to include those in the form of a film or a sheet. The terms "film" and "sheet" refer to a generally flat shaped body having a small thickness relative to its length and width, respectively. Furthermore, the "film" and "sheet" in this specification may be either a single layer or a multilayer body. If the measurement methods, etc. described in the standards shown in this specification vary from year to year, they will be based on the standards as of January 1, 2021, unless otherwise stated.

[0010] The multilayer body of the present embodiment is characterized by having a substrate formed from a resin composition containing a polycarbonate resin containing a structural unit represented by formula (1), a thermoplastic resin other than the polycarbonate resin containing the structural unit represented by formula (1), and a glass filler, and an outer film on at least one of the outer surfaces of the substrate, and the difference in refractive index between the thermoplastic resin component and the glass filler contained in the resin composition is 0.0150 or less. Formula (1) [ka] (In formula (1), R 1 represents a methyl group, and R 2 represents a hydrogen atom or a methyl group, and X 1 represents one of the following formulas: [ka] R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0011] By adopting such a constitution, a multilayer body having high transparency, shatterproofness and visibility can be obtained. That is, it is presumed that the transparency was improved by blending a highly transparent polycarbonate resin as the polycarbonate resin, further blending a thermoplastic resin with a lower refractive index than the glass filler, and setting the difference in refractive index between the thermoplastic resin component and the glass filler in the resin composition to a predetermined range or less. It is also presumed that the provision of an outer film effectively suppressed light scattering due to the roughness of the surface of the molded article, resulting in a multilayer body with excellent visibility. It is also presumed that the provision of an outer film also resulted in a multilayer body with excellent shatter resistance.

[0012] <Layer structure and properties of multilayer bodies> The multilayer body of this embodiment has a substrate and an outer film on at least one of the outer surfaces of the substrate. By providing the outer film on the surface of the substrate in this manner, it is possible to effectively prevent deterioration of visibility due to the glass filler contained in the substrate and to effectively prevent the multilayer body from shattering when the multilayer body is subjected to an impact. Here, the outer surface may be the surface of the substrate, or an intermediate layer may be provided between the substrate and the outer film. In this embodiment, it is preferable that the outer film is provided on the surface of the substrate. When an intermediate layer is provided, an adhesive layer is exemplified. For details of the adhesive layer, please refer to the description in paragraphs 0100 to 0101 of JP 2019-116039 A, the contents of which are incorporated herein by reference. As described above, in this embodiment, it is sufficient that the outer film is provided on at least one of the outer surfaces of the substrate, but it is preferable that the outer film is provided on both outer surfaces of the substrate. Here, when outer films are provided on both surfaces of the substrate, the outer films may be the same or different.

[0013] Fig. 1 is a cross-sectional schematic diagram showing an example of the layer structure of the multilayer body of this embodiment. In Fig. 1, 1 indicates the multilayer body, 2 indicates the substrate, and 3 indicates the outer film. In Fig. 1, for convenience, a space is provided between the substrate 2 and the outer film 3, but in this embodiment, the substrate 2 and the outer film 3 are in contact with each other. Furthermore, as described above, an intermediate layer may be provided between the substrate 2 and the outer film 3. In the embodiment of Fig. 1, the outer film is made up of three layers, but the outer film may be made up of only one layer, two layers, or four or more layers. Details of the outer film will be described later.

[0014] The total thickness of the multilayer body of this embodiment can be appropriately determined depending on the application, but is, for example, preferably 1.0 mm or more, more preferably 1.2 mm or more, even more preferably 1.5 mm or more, even more preferably 1.7 mm or more, and even more preferably 2.0 mm or more. The total thickness of the multilayer body is preferably 10 mm or less, more preferably 7 mm or less, even more preferably 5 mm or less, even more preferably 4 mm or less, and even more preferably 3 mm or less.

[0015] The thickness of the outer film in the multilayer body of this embodiment is preferably 0.5% or more, more preferably 1% or more, even more preferably 3% or more, even more preferably 5% or more, and even more preferably 10% or more, relative to the total thickness of the multilayer body. By making the thickness at or above the lower limit, shatter resistance and visibility tend to be further improved. Furthermore, the thickness of the outer film in the multilayer body is preferably 49% or less, more preferably 45% or less, even more preferably 40% or less, even more preferably 35% or less, and may even be 25% or less, relative to the total thickness of the multilayer body. By making the thickness at or below the upper limit, the thickness of the substrate tends to be thicker, making it easier to inject the molten resin composition into a mold and allowing the resulting molded article to more effectively exhibit the mechanical strength of the substrate reinforced with a glass filler. The multilayer body of this embodiment may have an outer film on only one side or on both sides, but if it has an outer film on both sides, it is preferable that the total thickness of the outer films be the above value.

[0016] Furthermore, in the multilayer body of this embodiment, the combined thickness of the substrate and outer film preferably accounts for 90% or more of the thickness of the multilayer body, more preferably 95% or more, and even more preferably 98% or more.

[0017] In the multilayer body of this embodiment, it is preferable that the adhesive strength between the substrate and the outer film is high. High adhesive strength tends to further improve the transparency of the resulting multilayer body. In the multilayer body of this embodiment, the adhesion strength between the outer film and the substrate measured by a 90-degree peel test according to JIS K 6854 is preferably 3 N / 15 mm or more, and more preferably 5 N / 15 mm or more. There is no particular upper limit, but even if it is 30 N / 15 mm or less, the required performance is sufficiently met. For example, when a multilayer body has a total thickness of 2 mm, outer films each 100 μm thick are used on both sides of a substrate film, and the adhesion strength is 0.8 N / 15 mm, the haze was 6.2% (6.9% haze converted to a 2 mm substrate thickness). When the mold temperature was changed in the same manner, the adhesion strength became 9.3 N / 15 mm and the haze became 5.3% (5.9% haze converted to a 2 mm substrate thickness). This shows that adhesion strength can have a significant effect on transparency. Also, from the viewpoint of product strength, it is preferable that the adhesion strength be 3 N / 15 mm or more. In the examples described below, all of the multilayer bodies shown as examples had an adhesion strength of 3 N / 15 mm or more.

[0018] The multilayer body of this embodiment preferably has excellent transparency. Specifically, when the thickness of the substrate is converted to 2 mm, the haze / 2 mm conversion at 23°C according to JIS K-7105 divided by the glass filler content (mass%) is preferably less than 1.00, and more preferably 0.9 or less. The lower limit of the haze / 2 mm conversion divided by the glass filler content (mass%) is ideally 0, but practically 0.001 or more is preferred. Haze is measured according to the method described in the examples below.

[0019] <Base material> Next, the substrate will be described. The substrate used in this embodiment is formed from a resin composition containing a polycarbonate resin containing a structural unit represented by formula (1), a thermoplastic resin other than the polycarbonate resin containing the structural unit represented by formula (1), and a glass filler. Furthermore, the difference in refractive index between the thermoplastic resin component and the glass filler contained in the resin composition is 0.0150 or less. The thermoplastic resin component refers to the sum of a polycarbonate resin containing a structural unit represented by formula (1) and other thermoplastic resins. The resin composition used in this embodiment typically contains 95 mass % or more, preferably 97 mass % or more, and more preferably 99 mass % or more of the components of the resin composition excluding the glass filler as the thermoplastic resin component.

[0020] <<Resin composition>> The resin composition used in this embodiment contains a polycarbonate resin containing a structural unit represented by formula (1). By including the structural unit represented by formula (1) in the polycarbonate resin, the transparency of the thermoplastic resin component can be increased, and further, the surface hardness of the resulting molded article can be increased. Formula (1) [ka] In formula (1), R 1 represents a methyl group, and R 2 represents a hydrogen atom or a methyl group, and X 1 represents one of the following formulas: [ka] R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0021] Examples of the alicyclic hydrocarbon formed by bonding Z to C include cycloalkylidene groups such as a cyclohexylidene group, a cycloheptylidene group, a cyclododecylidene group, an adamantylidene group, and a cyclododecylidene group. Examples of the alicyclic hydrocarbon having a substituent formed by bonding Z to C include methyl-substituted and ethyl-substituted alicyclic hydrocarbon groups described above. Among these, a cyclohexylidene group, a methyl-substituted cyclohexylidene group (preferably a 3,3,5-trimethyl-substituted cyclohexylidene group), and a cyclododecylidene group are preferred.

[0022] In formula (1), X 1 but, [ka] If R 3 and R 4At least one of the groups is preferably a methyl group, and both are more preferably methyl groups. Also X 1 but, [ka] In this case, Z bonds to the carbon C bonded to the two phenyl groups in formula (1) to form a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms. Examples of the divalent alicyclic hydrocarbon group include cycloalkylidene groups such as cyclohexylidene, cycloheptylidene, cyclododecylidene, adamantylidene, and cyclododecylidene. Substituted groups include those having a methyl or ethyl substituent. Among these, a cyclohexylidene group, a methyl-substituted cyclohexylidene group (preferably a 3,3,5-trimethyl-substituted cyclohexylidene group), and a cyclododecylidene group are preferred. In formula (1), X 1 is preferably the following structure: [ka]

[0023] A preferred example of the structural unit represented by the above formula (1) is 2,2-bis(3-methyl-4-hydroxyphenyl)propane, that is, a structural unit formed from bisphenol C (carbonate structural unit).

[0024] In the present embodiment, the polycarbonate resin may contain only one type of constitutional unit represented by formula (1), or may contain two or more types.

[0025] In this embodiment, the polycarbonate resin containing the structural unit represented by formula (1) preferably further contains a structural unit represented by formula (2). Here, containing a structural unit represented by formula (2) means that the polycarbonate resin contained in the resin composition used in this embodiment is a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2), or may be a blend of a polycarbonate resin containing a structural unit represented by formula (1) and a polycarbonate resin containing a structural unit represented by formula (2). By containing the structural unit represented by formula (2), the heat resistance of the resulting multilayer body tends to be further improved. Formula (2) [ka] In formula (2), X 2 represents one of the following formulas: [ka] R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0026] In formula (2), X 2 but, [ka] If R 3 and R 4 At least one of the groups is preferably a methyl group, and more preferably both are methyl groups. Also X 2 but, [ka] In this case, Z bonds to the carbon C bonded to the two phenyl groups in formula (2) to form a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms. Examples of the divalent alicyclic hydrocarbon group include cycloalkylidene groups such as cyclohexylidene, cycloheptylidene, cyclododecylidene, adamantylidene, and cyclododecylidene. Substituted groups include those having a methyl or ethyl substituent. Among these, a cyclohexylidene group, a methyl-substituted cyclohexylidene group (preferably a 3,3,5-trimethyl-substituted cyclohexylidene group), and a cyclododecylidene group are preferred. In formula (2), X 2 is preferably the following structure: [ka]

[0027] In this embodiment, the polycarbonate resin may contain only one type of constitutional unit represented by formula (2), or may contain two or more types.

[0028] In this embodiment, the polycarbonate resin may contain other structural units in addition to the structural unit represented by formula (1) and the structural unit represented by formula (2). Examples of other structural units include structural units derived from dihydroxy compounds shown below.

[0029] Bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3-(1-methylethyl)phenyl)propane, 2,2-bis(4-hydroxy-3-tert-butylphenyl)propane, 2,2-bis(4-hydroxy -3-(1-methylpropyl)phenyl)propane, 2,2-bis(4-hydroxy-3-cyclohexylphenyl)propane, 2,2-bis(4-hydroxy-3-phenylphenyl)propane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)phenylmethane, 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3, 5-dimethylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-(1-methylethyl)phenyl)cyclohexane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)cyclohexane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-phenylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-methylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-(1-methylethyl)phenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-phenylphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclooctane, 4,4'-(1,3-phenylenediisopropylidene)bisphenol, 4,4'-(1,4-phenylenediisopropylidene)bisphenol, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 4,4'-dihydroxybenzophenone, 4,4'-dihydroxyphenyl ether, 4,4'-dihydroxybiphenyl, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxy-6-methyl-3-tert-butylphenyl)butane.

[0030] In addition, as an embodiment of other structural units, the structural unit represented by formula (2) described in paragraph 0008 of WO 2017 / 099226, the description in paragraphs 0043 to 0052 of WO 2017 / 099226, and the description in JP 2011-046769 A can be referred to, the contents of which are incorporated herein by reference.

[0031] Furthermore, the polycarbonate resin used in this embodiment preferably has a proportion of the structural unit represented by formula (1) of 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more, and may further include 35% by mass or more, 45% by mass or more, 50% by mass or more, 70% by mass or more, or 75% by mass or more. By setting the proportion at or above the lower limit, the transparency of the obtained molded article tends to be further improved, the surface hardness of the molded article can be increased, and further, the dielectric loss tangent tends to be reduced. Furthermore, the proportion of the structural unit represented by formula (1) may be 100% by mass, but is preferably 95% by mass or less, more preferably 90% by mass or less, and may be 84% by mass or less. By setting the proportion at or below the upper limit, the deflection temperature under load tends to be higher.

[0032] In the polycarbonate resin used in this embodiment, the total of the structural units represented by the above formula (1) and the structural units represented by the formula (2) preferably accounts for 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more of all structural units excluding terminal groups. The upper limit of this total is 100% by mass or less.

[0033] The polycarbonate resin used in this embodiment preferably has the following form. (A1) Polycarbonate resin containing a structural unit represented by formula (1) (A2) A blend of a polycarbonate resin containing a structural unit represented by formula (1) and a polycarbonate resin containing a structural unit represented by formula (2) (A3) Polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2) (A4) A blend of a polycarbonate resin containing a structural unit represented by formula (1) and a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2). (A5) A blend of a polycarbonate resin containing a structural unit represented by formula (2) and a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2). (A6) A blend of a polycarbonate resin containing a structural unit represented by formula (1), a polycarbonate resin containing a structural unit represented by formula (2), and a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2). (A7) In the above (A1) to (A6), the polycarbonate resin or the polycarbonate resin constituting the blend thereof contains a structural unit represented by formula (1) and a structural unit other than the structural unit represented by formula (2). (A8) A blend of the polycarbonate resin or blend of any of the above (A1) to (A7) with a polycarbonate resin comprising other structural units.

[0034] The refractive index at a wavelength of 486 nm of the polycarbonate resin used in this embodiment is, for example, 1.5600 or more, further 1.5700 or more, particularly 1.5800 or more. The upper limit of the refractive index of the polycarbonate resin is preferably 1.6500 or less, more preferably 1.6400 or less, further preferably 1.6300 or less, even more preferably 1.6200 or less, still more preferably 1.6100 or less, further 1.6000 or less, particularly 1.5990 or less. The refractive index is measured as described in the Examples below. When two or more polycarbonate resins are contained, the refractive index is the refractive index of the mixture.

[0035] The viscosity average molecular weight (Mv) of the polycarbonate resin used in this embodiment has a lower limit of preferably 5,000 or more, more preferably 8,000 or more, even more preferably 10,000 or more, and still more preferably 12,000 or more. The upper limit of Mv is preferably 32,000 or less, more preferably 30,000 or less, even more preferably 29,000 or less, and still more preferably 27,000 or less. By setting the viscosity average molecular weight to the above lower limit or more, moldability is improved and molded articles with high mechanical strength can be obtained, while by setting the viscosity average molecular weight to the above upper limit or less, the flowability of the resin composition is improved and thin-walled molded articles can be efficiently produced. When the resin composition contains two or more types of polycarbonate resins, the total is the sum of values ​​obtained by multiplying the viscosity average molecular weight of each polycarbonate resin by the mass fraction. In particular, the viscosity average molecular weight of the polycarbonate resin containing the structural unit represented by formula (1) is preferably 20,000 to 30,000, and more preferably 20,000 to 28,000.The viscosity average molecular weight of the polycarbonate resin containing the structural unit represented by formula (2) is preferably 12,000 to 28,000, and more preferably 18,000 to 27,000. The viscosity average molecular weight (Mv) is measured according to the method described in the examples below.

[0036] The polycarbonate resin used in this embodiment (all polycarbonate resins including the structural unit represented by formula (1) and the structural unit represented by formula (2)) has a pencil hardness measured in accordance with ISO 15184 of, for example, 3B to 2H, and preferably 2B to 2H. The pencil hardness is measured according to the method described in the examples below. In particular, the pencil hardness of a polycarbonate resin containing a structural unit represented by formula (1) is preferably H to 2H, and the pencil hardness of a polycarbonate resin containing a structural unit represented by formula (2) is preferably 2B to HB.

[0037] The method for producing the polycarbonate resin used in this embodiment is not particularly limited, but for example, the description in paragraphs 0027 to 0043 and the Examples of JP-A-2014-065901 can be referred to, the contents of which are incorporated herein by reference.

[0038] The content of the polycarbonate resin in the resin composition used in this embodiment is 40 parts by mass or more, preferably 50 parts by mass or more, more preferably 60 parts by mass or more, even more preferably 68 parts by mass or more, even more preferably 70 parts by mass or more, even more preferably 72 parts by mass or more, even more preferably 75 parts by mass or more, and may be 76 parts by mass or more, per 100 parts by mass of the thermoplastic resin component. By setting the content at or above the lower limit, the impact strength of a molded article formed from the resin composition tends to be further improved, and a decrease in the heat resistance of the resin composition tends to be effectively suppressed. Furthermore, the content of the polycarbonate resin in the resin composition used in this embodiment may be 85 parts by mass or less, or may be 84 parts by mass or less, per 100 parts by mass of the resin component. By setting the content at or below the upper limit, the surface hardness of a molded article formed from the resin composition and the flowability of the resin composition tend to be further improved.

[0039] The resin composition used in this embodiment contains a polycarbonate resin containing a structural unit represented by formula (1) and other thermoplastic resins other than the polycarbonate resin. By including the other thermoplastic resins (usually resins having a lower refractive index than the polycarbonate resin), the refractive index of the thermoplastic resin component can be lowered. The type of thermoplastic resin other than the polycarbonate resin is not particularly limited, but typically one having a refractive index lower than that of the polycarbonate resin and the glass filler is selected. Specifically, the refractive index of the other thermoplastic resin (preferably a (meth)acrylate polymer described below) at a wavelength of 486 nm is preferably 1.5500 or less, more preferably 1.5400 or less, even more preferably 1.5300 or less, and even more preferably 1.5250 or less. The lower limit of the refractive index of the other thermoplastic resin is preferably 1.4900 or more, more preferably 1.5000 or more, and even more preferably 1.5100 or more. By ensuring that the refractive index is equal to or greater than the lower limit, the surface hardness of molded articles formed from the resin composition can be further increased.

[0040] Examples of other thermoplastic resins include (meth)acrylate polymers, acrylonitrile-styrene copolymers (AS resins), methyl methacrylate-styrene copolymers (MS resins), polystyrene resins, polyamide resins, polyethylene terephthalate resins, polybutylene terephthalate resins, polyarylate resins, polysulfone resins, and polyphenylene sulfide resins, with (meth)acrylate polymers being preferred. In particular, the inclusion of a (meth)acrylate polymer can increase the surface hardness of molded articles formed from the resin composition and can also increase the fluidity of the resin composition. The (meth)acrylate polymer used in this embodiment preferably contains an aromatic (meth)acrylate structural unit (b1), and more preferably contains the aromatic (meth)acrylate structural unit (b1) and a methyl methacrylate structural unit (b2). By containing the aromatic (meth)acrylate structural unit (b1), compatibility with polycarbonate resins can be improved, and by containing the methyl methacrylate structural unit (b2), the surface hardness of molded articles formed from the resin composition can be increased.

[0041] The aromatic (meth)acrylate (b1), which is a monomer constituting the aromatic (meth)acrylate structural unit, refers to a (meth)acrylate having an aromatic group. The aromatic (meth)acrylate (b1) is preferably a (meth)acrylate containing a benzene ring and / or a naphthalene ring, more preferably a (meth)acrylate containing a benzene ring. Specific examples of the aromatic (meth)acrylate (b1) include phenyl (meth)acrylate, biphenyl (meth)acrylate, and benzyl (meth)acrylate. Of these, phenyl methacrylate and benzyl methacrylate are preferred, and phenyl methacrylate is more preferred. The (meth)acrylate polymer may contain only one type of aromatic (meth)acrylate structural unit (b1), or may contain two or more types.

[0042] The monomer that constitutes the methyl methacrylate structural unit (b2) is methyl methacrylate.

[0043] When the (meth)acrylate polymer used in this embodiment contains an aromatic (meth)acrylate structural unit (b1) and a methyl methacrylate structural unit (b2), the mass ratio of (b1) / (b2) is more preferably 5 to 50 / 50 to 95, even more preferably 25 to 50 / 50 to 75, even more preferably 25 to 45 / 55 to 75, and even more preferably 30 to 40 / 60 to 70. When the (meth)acrylate polymer used in this embodiment contains an aromatic (meth)acrylate structural unit (b1) and a methyl methacrylate structural unit (b2), it may or may not contain other structural units. When other structural units are contained, styrene structural units and (meth)acrylate structural units other than (b1) and (b2) are preferred, and (meth)acrylate structural units other than (b1) and (b2) are more preferred. Examples of (meth)acrylate structural units other than (b1) and (b2) include aliphatic (meth)acrylates other than methyl methacrylate. In the (meth)acrylate polymer used in this embodiment, the total of the aromatic (meth)acrylate structural units (b1) and the methyl methacrylate structural units (b2) preferably accounts for 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more of all structural units excluding terminal groups. The upper limit of this total may be 100% by mass or less of all structural units excluding terminal groups.

[0044] The weight-average molecular weight of the (meth)acrylate polymer used in this embodiment is preferably 5,000 or more, more preferably 10,000 or more, and even more preferably 13,000 or more. By making it equal to or greater than the lower limit, the impact strength and heat resistance of the obtained molded article tend to be further improved. Furthermore, the weight-average molecular weight of the (meth)acrylate polymer is preferably 30,000 or less, more preferably 25,000 or less, even more preferably 20,000 or less, and even more preferably 16,000 or less. By making it equal to or less than the upper limit, the fluidity of the resin composition tends to be further improved. The weight average molecular weight of the (meth)acrylate polymer is measured according to the description in the Examples section below.

[0045] In addition to the above, the (meth)acrylate polymer used in this embodiment may be any of those described in WO 2014 / 038500, WO 2013 / 094898, JP 2006-199774, JP 2010-116501, JP 2014-065901, and JP 2016-027068, as well as the "aromatic (meth)acrylate" described in JP 2016-047937, the contents of which are incorporated herein by reference.

[0046] The content of the other thermoplastic resin (preferably a (meth)acrylate polymer) in the resin composition used in this embodiment is 15 parts by mass or more, and may be 16 parts by mass or more, per 100 parts by mass of the thermoplastic resin component. By ensuring that the content is above the lower limit, the surface hardness of a molded article formed from the resin composition and the flowability of the resin composition tend to be further improved. Furthermore, the content of the other thermoplastic resin (preferably a (meth)acrylate polymer) in the resin composition used in this embodiment is 60 parts by mass or less, preferably 50 parts by mass or less, more preferably 40 parts by mass or less, more preferably 32 parts by mass or less, even more preferably 30 parts by mass or less, even more preferably 28 parts by mass or less, even more preferably 25 parts by mass or less, and may be 24 parts by mass or less, per 100 parts by mass of the thermoplastic resin component. By ensuring that the content is below the upper limit, the impact strength of a molded article formed from the resin composition tends to be further improved, and a decrease in the heat resistance of the resin composition tends to be effectively suppressed.

[0047] The resin composition used in this embodiment contains a glass filler, which can improve the mechanical strength of the resulting molded article. The glass filler in this embodiment is not particularly limited, and a wide variety of fillers that are used to reinforce thermoplastic resins can be used.

[0048] The refractive index at a wavelength of 486 nm of the glass filler used in this embodiment is, for example, 1.5500 or more, further 1.5600 or more, particularly 1.5700 or more. The refractive index of the glass filler is, for example, 1.5900 or less, further 1.5850 or less, particularly 1.5800 or less. The refractive index is measured as described in the Examples below. When two or more glass fillers are contained, the refractive index of the glass fillers is the sum of the values ​​obtained by multiplying the refractive index of each glass filler by the mass fraction.

[0049] The glass filler used in this embodiment may be in any shape such as fiber, plate, or bead, but is preferably in fiber form. When the glass filler used in this embodiment is fibrous, it preferably has a number average fiber length (cut length) of 0.5 to 10.0 mm, more preferably 1.0 to 5.0 mm. By using a glass filler (glass fiber) with such a number average fiber length, mechanical strength can be further improved. Examples of glass fibers with a number average fiber length (cut length) of 0.5 to 10.0 mm include those sold as chopped strands. The number average fiber length is calculated by randomly selecting glass fibers to be measured for fiber length from an image obtained by observation with an optical microscope, measuring the long sides of the fibers, and then calculating the number average fiber length from the obtained measurements. The observation is performed at a magnification of 20x, and the number of fibers measured is 1,000 or more. This roughly corresponds to the cut length. The cross-sectional shape of the glass fiber may be any shape, such as a circle, an ellipse, an oval, a rectangle, a rectangle with semicircles on both short sides, or a cocoon shape. In this embodiment, the glass filler preferably contains glass fibers having a flat cross section, and the flatness is more preferably 1.5 to 8, and further preferably 2 to 6. By using such flat glass fibers, light scattering can be effectively suppressed, and the transparency of the resulting molded article can be further improved. The lower limit of the number average fiber diameter of the glass fibers is preferably 4.0 μm or more, more preferably 4.5 μm or more, and even more preferably 5.0 μm or more. The upper limit of the number average fiber diameter of the glass filler is preferably 15.0 μm or less, more preferably 12.0 μm or less. The number average fiber diameter of the glass fibers is calculated from the measured values ​​obtained by randomly selecting glass fibers to be measured for fiber diameter from an image obtained by observation with an electron microscope, measuring the fiber diameter near the center, and then measuring the measured values. The observation is performed at a magnification of 1,000 times, and the number of fibers measured is 1,000 or more. The number average fiber diameter of glass fibers having a cross section other than a circle is the number average fiber diameter when converted into a circle with the same area as the cross section.

[0050] Next, the glass fiber preferably used in this embodiment will be described. The glass fiber is a fiber obtained by melt spinning a commonly supplied glass such as E-glass, C-glass, A-glass, S-glass, D-glass, R-glass, or M-glass, but is not particularly limited as long as it can be made into a glass fiber. In this embodiment, it is preferable to include E-glass. The glass fibers used in this embodiment are preferably surface-treated with a surface treatment agent such as a silane coupling agent, for example, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, or γ-aminopropyltriethoxysilane. The amount of the surface treatment agent attached is preferably 0.01 to 1% by mass of the glass fibers. Furthermore, if necessary, glass fibers may be surface-treated with a lubricant such as a fatty acid amide compound or silicone oil, an antistatic agent such as a quaternary ammonium salt, a resin capable of forming a film, such as an epoxy resin or a urethane resin, or a mixture of a resin capable of forming a film with a heat stabilizer or a flame retardant. The glass fibers used in this embodiment may be bundled with a sizing agent. In this case, epoxy-based or urethane-based sizing agents are preferred.

[0051] Glass fibers are commercially available, such as T-187, T-286H, T-756H, and T-289H manufactured by Nippon Electric Glass Co., Ltd., DEFT2A manufactured by Owens Corning, HP3540 manufactured by PPG, and CSG3PA820 manufactured by Nitto Boseki Co., Ltd.

[0052] The content of the glass filler (preferably glass fiber) in the resin composition used in this embodiment is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and even more preferably 15 parts by mass or more, relative to 100 parts by mass of the thermoplastic resin component. By ensuring that the content is above the lower limit, the mechanical strength of the resulting molded article tends to be further improved. Furthermore, the content of the glass filler (preferably glass fiber) in the resin composition used in this embodiment is preferably 100 parts by mass or less, more preferably 90 parts by mass or less, even more preferably 80 parts by mass or less, even more preferably 70 parts by mass or less, and may even be 50 parts by mass or less, or 30 parts by mass or less, relative to 100 parts by mass of the thermoplastic resin component. By ensuring that the content is below the upper limit, the flowability during injection molding tends to be improved. The content of the glass filler (preferably glass fiber) in the resin composition used in this embodiment is preferably 5% by mass or more, more preferably 9% by mass or more, even more preferably 10% by mass or more, and even more preferably 15% by mass or more. The content of the glass filler (preferably glass fiber) in the resin composition is preferably 50% by mass or less, more preferably 41% by mass or less, even more preferably 40% by mass or less, and may even be 30% by mass or less, particularly 28% by mass or less. The resin composition used in this embodiment may contain only one type of glass filler, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0053] The resin composition used in this embodiment may contain, in addition to the polycarbonate resin, other thermoplastic resin (e.g., (meth)acrylate polymer), and glass filler, other components as needed, as long as the desired physical properties are not significantly impaired. Examples of the other components include various resin additives. Examples of resin additives include release agents (such as ester compounds), stabilizers (such as heat stabilizers and antioxidants), UV absorbers, antistatic agents, flame retardants, flame retardant aids, dyes, pigments, antifogging agents, lubricants, antiblocking agents, flow improvers, plasticizers, dispersants, and antibacterial agents. One type of resin additive may be contained, or two or more types may be contained in any combination and ratio. For details of these additives, please refer to paragraphs 0059 to 0080 of JP 2014-065901 A and paragraphs 0069 to 0093 of JP 2018-165017 A, the contents of which are incorporated herein by reference. The resin composition used in this embodiment is adjusted so that the total of polycarbonate resin, other thermoplastic resin (such as a (meth)acrylate polymer), glass filler, and resin additives (e.g., ester compounds, stabilizers) blended as needed is 100% by mass.

[0054] The resin composition used in this embodiment may contain a mold release agent. By containing a mold release agent, the mold releasability tends to be further improved. Although known release agents can be used, ester compounds are preferred, and ester compounds of aliphatic alcohols (e.g., saturated aliphatic monohydric alcohols having 16 to 22 carbon atoms or polyhydric alcohols having 2 to 12 carbon atoms) and aliphatic carboxylic acids (e.g., mono- or dicarboxylic acids having 16 to 22 carbon atoms) are more preferred. For details of the ester compounds, please refer to paragraphs 0047 to 0054 of JP 2020-029481 A, the contents of which are incorporated herein by reference.

[0055] When the resin composition used in this embodiment contains a mold release agent (preferably an ester compound), the content thereof is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, per 100 parts by mass of the thermoplastic resin component. By setting the content at or above the lower limit, the effect of improving mold releasability tends to be effectively exhibited. Furthermore, the upper limit is preferably 2.2 parts by mass or less, and may be 1.5 parts by mass or less, or even 1.0 part by mass or less, per 100 parts by mass of the thermoplastic resin component. By setting the content at or below the upper limit, problems such as mold contamination during injection molding can be effectively suppressed. Furthermore, the transparency of the resulting molded product tends to be further improved. The resin composition used in the present embodiment may contain only one type of release agent, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0056] The resin composition used in this embodiment may contain a stabilizer. The stabilizer includes a heat stabilizer and an antioxidant. As the heat stabilizer, a phosphorus-based stabilizer is preferably used. Any known phosphorus-based stabilizer can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; metal acid pyrophosphates such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate; phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds, with organic phosphite compounds being particularly preferred.

[0057] As the antioxidant, a hindered phenol-based stabilizer is preferably used. Specific examples of hindered phenol stabilizers include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphate, 3,3',3'',5,5',5''-hexa-tert-butyl-a,a',a''-(mesityle) 4,6-bis(octylthiomethyl)-o-cresol, ethylene bis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl)tri-p-cresol -4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2-ylamino)phenol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, and the like.

[0058] Specific examples of such hindered phenol stabilizers include "Irganox (registered trademark; the same applies hereinafter) 1010" and "Irganox 1076" manufactured by BASF, and "ADK STAB AO-50" and "ADK STAB AO-60" manufactured by ADEKA Corporation.

[0059] The content of the stabilizer in the resin composition used in this embodiment is usually 0.001 part by mass or more, preferably 0.005 part by mass or more, more preferably 0.01 part by mass or more, and usually 1 part by mass or less, preferably 0.5 part by mass or less, more preferably 0.3 part by mass or less, relative to 100 parts by mass of the thermoplastic resin component. By setting the content of the stabilizer within this range, the effect of adding the stabilizer can be more effectively exerted. The resin composition used in the present embodiment may contain only one stabilizer, or may contain two or more stabilizers. When two or more stabilizers are contained, the total amount is preferably in the above range.

[0060] <<Method of manufacturing resin composition>> The method for producing the resin composition used in this embodiment is not particularly limited, and a wide variety of known methods for producing resin compositions can be used, including a method in which the polycarbonate resin, other thermoplastic resins, glass fillers, and other components added as needed are premixed using a mixer such as a tumbler or Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, roll, Brabender, single-screw kneading extruder, twin-screw kneading extruder, or kneader. The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0061] <<Difference in refractive index>> In this embodiment, the difference in refractive index between the thermoplastic resin component and the glass filler contained in the resin composition is adjusted to 0.0150 or less. The difference in refractive index refers to an absolute value. This configuration can improve the transmittance of the resulting molded article. The upper limit of the difference in refractive index is preferably 0.0100 or less, more preferably 0.0080 or less, even more preferably 0.0060 or less, even more preferably 0.0040 or less, even more preferably 0.0030 or less, even more preferably 0.0025 or less, and even more preferably 0.0020 or less, 0.0010 or less, 0.0009 or less, or 0.0008 or less. Ideally, the lower limit of the difference in refractive index is 0. However, for example, a value of 0.0001 or more, or even 0.0003 or more, can sufficiently satisfy the required performance.

[0062] <<Substrate thickness>> The thickness of the substrate in this embodiment is preferably 0.5 mm or more, more preferably 1 mm or more, and is preferably 10 mm or less, more preferably 5 mm or less. If the thickness is equal to or greater than the lower limit, sufficient mechanical strength can be obtained for the molded product, and this is preferable from the viewpoint of injection moldability. If the thickness is equal to or less than the upper limit, this is preferable from the viewpoint of weight reduction and cost.

[0063] <Outer film> Next, the outer film of the multilayer body of this embodiment will be described. The type of outer film is not particularly limited as long as it does not deviate from the spirit of the present invention. Furthermore, as described above, the outer film may be provided on one side or both sides of the substrate. When provided on both sides, the outer films may be the same or different. Depending on the application, the multilayer body of this embodiment is expected to be incorporated as part of a component. In this case, one side is often exposed to the surface of the component, and the other side faces the interior of the component. In such cases, the performance required for the surface of the outer film on one side will naturally differ from that required for the surface of the outer film on the other side. For example, one side may require high hardness, while the other side does not.

[0064] The outer film used in this embodiment may be a single-layer film or a multilayer film. In the case of a multilayer film, there is no particular limit to the number of layers, and in addition to the resin layer, layers such as multicolor printing or vapor deposition may be incorporated. The outer film preferably has one or two or more layers, and may have three or more layers, or may have five or fewer layers, four or fewer layers, or three or fewer layers. As described above, the outer film may be provided on one or both sides of the substrate, and when provided on both sides, one may be a single-layer film and the other a multilayer film.

[0065] The outer film used in this embodiment preferably has high transparency, which can improve the transparency of the resulting multilayer body itself. Specifically, the haze of the outer film is preferably less than 1.0%, more preferably less than 0.8%, and even more preferably less than 0.5%. The lower limit of the haze of the outer film is ideally 0%, but even if it is 0.001% or more, the required performance is met. The haze is measured at 23°C using a haze meter in accordance with JIS K-7105. The polycarbonate resin layer (layer containing a polycarbonate resin), (meth)acrylic polymer layer (layer containing a (meth)acrylic polymer), hard coat layer, etc., which will be described later, usually satisfy the above haze requirement. Furthermore, the outer film used in this embodiment is substantially free of fillers such as glass fillers, thereby achieving the above-mentioned excellent transparency. This is because glass fillers typically have a large refractive index difference from the thermoplastic resin component, which tends to impair transparency. Here, "substantially free" means that the filler content is 5% by mass or less of the mass of the outer film, preferably 1% by mass or less, and more preferably 0.1% by mass or less.

[0066] The outer film used in this embodiment also preferably includes a layer whose outermost layer has a higher pencil hardness than the resin layer (for example, a polycarbonate resin layer) adhered to the polycarbonate resin of the substrate. Here, the polycarbonate resin of the substrate refers to the polycarbonate resin (a mixture if two or more types are used) contained in the resin composition. By including such a layer, the surface of the substrate of this embodiment can be protected. Specifically, it preferably has a layer with a pencil hardness of H or more, more preferably a layer with a pencil hardness of 2H or more, and may also be a layer with a pencil hardness of 9H or less. This includes a layer containing a (meth)acrylic polymer and a hard coat layer, which will be described later. Furthermore, a layer containing a polycarbonate resin having a pencil hardness higher than that of the polycarbonate resin contained in the resin composition also falls under the category of a layer having a pencil hardness higher than that of the polycarbonate resin.

[0067] The layer of the outer film used in this embodiment that adheres to the substrate preferably has excellent tensile strength and tensile elongation from the viewpoint of preventing fragments from scattering when the film is broken by impact. According to JIS K7127, the tensile strength is preferably 60 MPa or more and / or the tensile elongation is more preferably 50% or more. When the tensile strength and / or tensile elongation are above the lower limit, when the substrate is broken by impact, the outer film tends to hold back the fragments of the substrate and prevent the fragments from scattering. From this viewpoint, the tensile strength of the outer film is more preferably 65 MPa or more, and the tensile elongation is preferably 60% or more. An example of an outer film is one that typically has a tensile strength of 80 MPa or less and a tensile elongation of 300% or less. The polycarbonate resin film described below corresponds to this.

[0068] In this embodiment, the resin used in the layer of the outer film that adheres to the substrate preferably has a high deflection temperature under load. By using a resin, the outer film fulfills its insulating role, and the resin in the substrate formed from the injected resin composition can have a higher contact temperature with the film, making filling easier, better suppressing glass lift, and further improving transparency. The deflection temperature under load is preferably 60°C or higher, more preferably 80°C or higher, at a load of 1.80 MPa. The upper limit is, for example, 200°C or lower, and may be 150°C or lower. Examples of resins that satisfy this deflection temperature under load include polycarbonate resin, biaxially oriented polyethylene terephthalate film, and thermoplastic polyurethane elastomer. The deflection temperature under load is measured in accordance with JIS K7191. Furthermore, elastomers such as thermoplastic polyurethane preferably have a Vicat softening point of 60° C. or higher (with an upper limit of, for example, 200° C. or lower). The Vicat softening point is measured in accordance with JIS K7206 A50 method (heating rate 50 k / h, load 10 N).

[0069] The outer film used in this embodiment preferably has a small surface roughness Ra of the outermost layer. Specifically, Ra is preferably 0.1 μm or less, and more preferably 0.05 μm or less. The lower limit of Ra is not particularly specified, but may be, for example, 0.0001 μm or more. Measurement of Ra can be carried out in accordance with the description in paragraph 0158 of WO 2019 / 146807, the contents of which are incorporated herein by reference. Such a film with a small Ra is preferably a polycarbonate resin layer (for example, a polycarbonate resin layer containing a structural unit represented by formula (1)), a layer containing a (meth)acrylic polymer, or a hard coat layer.

[0070] The resin used in the layer of the outer film used in this embodiment that adheres to the substrate preferably contains, as a thermoplastic resin component, one or more resins selected from the group consisting of polycarbonate resin, thermoplastic polyurethane elastomer, thermoplastic elastomer, polyester resin, polyamide resin, polyimide resin, and alicyclic polyolefin resin. In particular, when using a polyester resin or polyamide resin, which is a film that normally has poor heat resistance, a film whose strength and heat resistance have been enhanced by biaxial stretching is desirable. The layer containing a (meth)acrylic polymer and / or the polycarbonate resin layer containing the structural unit represented by formula (1), which will become the high-hardness layer, is preferably provided at a position that will become the outermost surface of the multilayer body. The film used in this embodiment preferably further includes a hard coat layer on the outermost surface of the film. The hard coat layer is preferably provided at a position that will become the outermost surface of the layer containing a (meth)acrylic polymer and / or the polycarbonate resin layer (preferably the polycarbonate resin layer containing the structural unit represented by formula (1)) of the multilayer body.

[0071] The layer containing a (meth)acrylic polymer ((meth)acrylic polymer layer) is a layer containing one or more types of (meth)acrylic polymer as the main component, and for example, 80% by mass or more (preferably 90% by mass or more, more preferably 95% by mass or more) of the (meth)acrylic polymer layer is a (meth)acrylic polymer. As the (meth)acrylic polymer, a wide variety of known (meth)acrylic polymers can be used, and (meth)acrylic polymers such as polymethyl methacrylate are preferred. The resin composition may also contain additives to improve weather resistance, fingerprint resistance, and the like.

[0072] The thickness of the (meth)acrylic polymer layer is preferably 20 μm or more, more preferably 40 μm or more, and is preferably 150 μm or less, more preferably 120 μm or less.

[0073] On the other hand, a layer containing a polycarbonate resin (preferably a layer containing a polycarbonate resin containing a structural unit represented by formula (1)) (polycarbonate resin layer) is a layer containing polycarbonate resin as a main component, and for example, 60% by mass or more (preferably 65% ​​by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, more preferably 90% by mass or more) of the polycarbonate resin layer is polycarbonate resin. The polycarbonate resin containing a structural unit represented by formula (1) is synonymous with the polycarbonate resin containing a structural unit represented by formula (1) described above in the resin composition section. Note that the polycarbonate resin containing a structural unit represented by formula (1) also includes a polycarbonate resin containing both a structural unit represented by formula (1) and a structural unit represented by formula (2), and a blend of a polycarbonate resin containing a structural unit represented by formula (1) and a polycarbonate resin containing a structural unit represented by formula (2). The resin composition may also contain the resin additives that may be blended into the resin composition.

[0074] The thickness of the layer containing a polycarbonate resin (preferably a layer containing a polycarbonate resin containing a structural unit represented by formula (1)) is preferably 20 μm or more, more preferably 40 μm or more, and is preferably 150 μm or less, more preferably 120 μm or less.

[0075] In addition to the above, for other thermoplastic resins, please refer to the descriptions in paragraphs 0083 to 0096 of JP 2019-116039 A, the contents of which are incorporated herein by reference. For thermoplastic elastomers, please refer to the descriptions in paragraphs 0078 to 0091 of JP 2020-163597 A, the contents of which are incorporated herein by reference.

[0076] Next, the hard coat layer will be described. As a hard coat agent for forming the hard coat layer, a known material can be appropriately used, and various hard coat agents such as silicone-based, acrylic-based, silazane-based, and urethane-based hard coat agents can be used. Furthermore, in order to improve weather resistance, fingerprint resistance, and adhesion, additives may be blended into the hard coating agent, or a two-coat type hard coating agent may be used in which a primer layer containing an adhesive or a primer layer containing a weather resistance improver is provided before applying the hard coating agent. There are no particular limitations on the coating method for the hard coating agent, and it can be applied by any coating method such as spray coating, dip coating, flow coating, spin coating, bar coating, curtain coating, die coating, gravure coating, roll coating, blade coating, and air knife coating.

[0077] The thickness of the hard coat layer is preferably 1 μm or more, more preferably 5 μm or more, and is preferably 50 μm or less, more preferably 30 μm or less.

[0078] In addition to the above, the outer film used in this embodiment may be provided with an anti-reflection layer, an anti-fouling layer, a print layer, an adhesive layer, an anti-glare layer, and the like.

[0079] The thickness (total thickness) of the outer film is preferably 50 μm or more, more preferably 75 μm or more, taking into account the balance between thinness, handleability, tensile strength, etc., and is preferably 1000 μm or less, more preferably 500 μm or less. When a biaxially oriented polyester film is used as the outer film, the high crystallinity of the film may result in poor adhesion to the resin composition substrate by heat fusion. In this case, it is preferable to provide an adhesive layer on the film. Furthermore, because biaxially oriented polyester film has low adhesiveness, it can also be used as a transfer sheet for laminating a hard coat layer, decorative layer, etc. Specifically, at least a hard coat layer and / or decorative layer, a primer layer, and an adhesive layer are laminated onto the biaxially oriented polyester film, the substrate and the adhesive layer are thermally bonded during injection molding, and then the biaxially oriented polyester film is removed, making it possible to provide a hard coat layer and / or decorative layer on the outermost surface of the substrate. By laminating a biaxially oriented polyester film with a hard coat layer and / or a decorative layer, a heat insulating effect is also exhibited during molding, and the base material (resin composition) becomes more fluid, effectively suppressing the floating of the glass filler in the resulting multilayer body and improving transparency. Note that the biaxially oriented polyester film may have a release layer on its surface to improve releasability from the hard coat layer.

[0080] Next, an example of a preferred layer structure of the outer film will be described with reference to Fig. 2. Fig. 2 shows an example of the outer film 3, in which 31 denotes a hard coat layer, 32 denotes a (meth)acrylate polymer layer, and 33 denotes a polycarbonate resin layer. In the present embodiment shown in Fig. 2, the outermost layer is a hard coat layer 31. The outermost layer preferably has a low Ra and a high pencil hardness. In the embodiment shown in Fig. 2, the innermost layer, that is, the layer that is usually in contact with the substrate, is a polycarbonate resin layer. The innermost layer is preferably one that has good compatibility with the resin composition. In the embodiment shown in Fig. 2, the layer between the outermost layer and the innermost layer is a (meth)acrylate polymer layer. The layer between the outermost layer and the innermost layer is preferably a (meth)acrylate polymer layer or a layer having high hardness and strength. The layer between the outermost layer and the innermost layer may be two or more layers.

[0081] Preferred layer structures of the outer film used in this embodiment are shown below. It goes without saying that the multi-layer outer film of this embodiment is not limited to these. In the layer structures shown below, the left side may be the outermost layer, or the right side may be the innermost layer, but it is preferable that the left side be the outermost layer. (1) Polycarbonate resin layer (2) Hard coat layer / polycarbonate resin layer (3) (Meth)acrylate polymer layer / polycarbonate resin layer (4) Hard coat layer / (meth)acrylate polymer layer / polycarbonate resin layer (5) Polycarbonate resin layer containing formula (1) / polycarbonate resin layer (6) Hard coat layer / polycarbonate resin layer containing formula (1) / polycarbonate resin layer Among the above, the outer film used in the portion exposed on the surface of the molded article is preferably (2) to (6). Also, the outer film located inside the molded article is preferably on the polycarbonate resin layer side.

[0082] <Molded products> Next, the molded article of this embodiment will be described. The molded article of this embodiment is a molded article including the multilayer body of this embodiment. The use of the molded article of this embodiment is not particularly limited, but it is preferably a display part, a mobile information terminal part, a household electrical appliance, or an indoor furniture. More preferably, it is useful as a touch panel cover, and is useful as a resin cover for a display, for example, a touch panel cover for various tablet-type mobile terminals such as smartphones, tablet-type personal computers, car navigation systems, car audio systems, etc. It goes without saying that when forming a molded article, it is not excluded to have another layer on the surface of the outer film of the multi-layered body.

[0083] <Method of manufacturing a multilayer body> Next, a method for producing the multilayer body of this embodiment will be described. The multilayer body in this embodiment includes injection molding by injecting a melt of the resin composition into a mold loaded with an outer film. This configuration effectively prevents the glass filler in the resin composition from floating on the surface of the molded article. Furthermore, the outer film provides a heat insulating effect, effectively prevents glass from floating in the resin composition, improves transparency, and achieves high adhesion between the outer film and the substrate.

[0084] 3 is a schematic diagram showing an example of a method for producing a multilayer body according to this embodiment, in which 3 denotes an outer film, 4 denotes a mold, and 5 denotes an injection molding machine. 21 denotes a resin composition for forming a substrate. 1 denotes a multilayer body. As shown in FIG. 3, in this embodiment, outer films 3 and 3 are loaded into molds 4 and 4, respectively. The outer films 3 and 3 may be the same or different. Next, after closing the molds, a molten resin composition 21 is injected from an injection molding machine 5. There are no particular restrictions on the injection molding conditions, and ordinary injection molding conditions using a polycarbonate resin composition can be adopted. For example, the injection speed of the resin composition is usually 10 to 100 mm / sec, the dwell pressure when the mold is clamped is usually 10 to 100 MPa, and the dwell time is usually about 5 to 30 seconds. The mold temperature can be appropriately set, for example, in the range of 70 to 110°C.

[0085] The surface temperature of the outer film can be set to the target temperature by changing the mold temperature, but it may be close to the Tg of the resin composition, or may even exceed Tg if the temperature of the molten resin composition is low. Therefore, it is desirable to heat the mold only during injection and dwell time, and use mold heating and cooling in conjunction with the molding process to make the temperature lower than Tg during cooling, or to heat only the film immediately before injection. Next, after cooling in mold 4·4, it is removed from the mold and multilayer body 1 is obtained.

[0086] The outer film used in this embodiment is as described above, and the preferred range is also the same. In the method for producing a multilayer body of this embodiment, it is preferable that the outer film has a layer having a pencil hardness higher than that of the polycarbonate resin, and that the film is loaded so that the layer having the higher pencil hardness is in contact with the mold. Furthermore, in the method for producing a multilayer body of this embodiment, it is preferable that the outer film has a layer containing a (meth)acrylic polymer and / or a layer containing a polycarbonate resin containing a structural unit represented by formula (1), and that the outer film is loaded so that one of the layer containing the (meth)acrylic polymer and / or the layer containing the polycarbonate resin containing the structural unit represented by formula (1) is in contact with the mold. Furthermore, in the method for producing a multilayer body of this embodiment, it is preferable that the outer film has a hard coat layer, and that the outer film is loaded so that the hard coat layer comes into contact with the mold. In addition, the method for producing the multilayer body of this embodiment can be based on the description in paragraphs 0102 to 0106 of JP 2019-116039 A, within the scope of the present invention, and the contents of these paragraphs are incorporated into this specification. [Example]

[0087] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, processing details, 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. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or the like, measurements can be made using other instruments with equivalent performance.

[0088] 1. Raw materials The resin composition for forming the base material was made from the raw materials listed in Table 1-1, and the outer film was made from the film listed in Table 1-2. [Table 1-1] [Table 1-2]

[0089] <Production Example 1: Production of Polycarbonate Resin A1-1> 26.14 mol (6.75 kg) of bisphenol C (BPC) and 26.79 mol (5.74 kg) of diphenyl carbonate were placed in an aluminum (SUS) reactor (internal volume: 10 L) equipped with a stirrer and a distillate condenser, and after the reactor was purged with nitrogen gas, the temperature was raised to 220°C in a nitrogen gas atmosphere over 30 minutes. Next, the reaction solution in the reactor was stirred, and cesium carbonate (Cs2CO3) was added as a transesterification catalyst to the molten reaction solution in an amount of 1.5 × 10 per mole of BPC. -6 The reaction mixture was stirred and fermented under a nitrogen gas atmosphere at 220°C for 30 minutes. Next, the pressure inside the reactor was reduced to 100 Torr over 40 minutes at the same temperature, and the reaction was continued for a further 100 minutes to distill off phenol. Next, the temperature inside the reactor was raised to 284°C over 60 minutes while the pressure was reduced to 3 Torr, and almost the entire theoretical amount of phenol was distilled out. The pressure inside the reactor was then maintained at less than 1 Torr at the same temperature, and the reaction was continued for another 60 minutes to complete the polycondensation reaction. The stirring speed of the stirrer was 38 rpm, and the reaction liquid temperature just before the end of the reaction was 289°C, with a stirring power of 1.00 kW. Next, the reaction liquid in a molten state was fed into a twin-screw extruder, and butyl p-toluenesulfonate in an amount four times by mole relative to the cesium carbonate was fed into the first feed port of the twin-screw extruder and kneaded with the reaction liquid. Thereafter, the reaction liquid was extruded into strands through the die of the twin-screw extruder and cut with a cutter to obtain pellets of polycarbonate resin A1-1.

[0090] <Measurement of viscosity average molecular weight (Mv) of polycarbonate resin> The viscosity average molecular weight (Mv) of the polycarbonate resin was calculated from the intrinsic viscosity (η) (unit: dL / g) at 20°C using an Ubbelohde viscometer with methylene chloride as a solvent, using the following Schnell viscosity formula: η = 1.23 × 10 -4 Mv 0.83

[0091] <Pencil hardness measurement> <<Measurement of pencil hardness of polycarbonate resin>> The polycarbonate resin pellets were dried at 100°C for 5 hours, and then injection-molded into flat test pieces (150 mm x 100 mm x 2 mm thick) using an injection molding machine (FANUC Corporation, "S-2000i150B") under conditions of a cylinder setting temperature of 280°C, a mold temperature of 100°C, a screw rotation speed of 100 rpm, and an injection speed of 30 mm / s. The pencil hardness of the obtained flat test piece (150 mm x 100 mm x 2 mm thick) was measured in accordance with ISO 15184 using a pencil hardness tester under a load of 750 g to determine the hardness. The pencil hardness tester used was manufactured by Toyo Seiki Co., Ltd.

[0092] <<Measurement of film pencil hardness>> The pencil hardness was determined in accordance with ISO 15184 using a pencil hardness tester under a load of 750 g. The pencil hardness tester used was manufactured by Toyo Seiki Co., Ltd.

[0093] <Weight-average molecular weight (Mw) of (meth)acrylate polymer> The weight average molecular weight of the (meth)acrylate polymer was measured by gel permeation chromatography using chloroform as a solvent, and expressed as a polystyrene (PS) equivalent value.

[0094] <Production of Resin Composition Pellets> The components (excluding the glass filler) listed in Table 1-1 above were blended in the proportions (expressed in parts by mass unless otherwise specified) shown in Tables 2 to 6 below, and after uniformly mixing in a tumbler mixer, one vent was supplied to a twin-screw extruder (Shibaura Machine Co., Ltd., TEM26SX) from an upstream feeder, and the glass filler was further supplied from the middle of the barrel (a position 3 / 5 of the way down the barrel length L from the upstream (hopper portion) of the extruder). The cylinder was set at a temperature of 260°C, the screw rotation speed was 250 rpm, and the output was 25 kg / hr, and the mixture was melt-kneaded to obtain resin composition pellets.

[0095] 2. Examples 1 to 16 and Comparative Examples 1 to 8 <Manufacturing of multilayer bodies> As shown in Figure 3, the outer film 3·3 shown in Table 1-2 was set in the mold 4·4, and in this state, the resin composition 21 was injection molded to integrally mold a substrate 2 formed from the resin composition 21 and the outer film 3·3, having a thickness of 2 mm, to obtain a multilayer body 1. Using an injection molding machine (FANUC Corporation, "S-2000i150B"), flat plate-shaped test pieces (150 mm x 100 mm x 2 mm thick) were injection molded under the following conditions: cylinder temperature setting of 280°C, mold temperature of 100°C, screw rotation speed of 100 rpm, and injection speed of 30 mm / s. The outer films were arranged so that the HC (hard coat layer) of the HC / PMMA / PC film and the PMMA layer of the PMMA / PC film were in contact with the mold.

[0096] <Haze measurement> The haze (unit: %) of the multilayer body obtained above was measured at 23° C. using a haze meter in accordance with JIS K-7105. The haze meter used was a NDH-4000 type haze meter manufactured by Nippon Denshoku Industries Co., Ltd. The obtained haze was calculated based on the thickness of the substrate being 2 mm and divided by the content (mass%) of the glass filler, and the value was shown. This is based on the fact that the total thickness of the multilayer bodies produced this time was 2 mm, and the haze increases according to the thickness of the substrate. In other words, the haze tends to worsen as the proportion of the thickness of the substrate derived from the resin composition increases, and this was done to make comparison easier.

[0097] <Visibility> The obtained multilayer body was visually evaluated for visibility resulting from floating of the glass filler. The evaluation was carried out by five experts and was based on a majority vote. A: No floating of glass filler was observed B: Floating of glass filler was observed

[0098] <Shatterproof> In accordance with JIS K5600-5-3, the resulting multilayer body was placed on a support 11 in a DuPont impact test apparatus 10 as shown in FIG. 4, with the outer film 1 side facing upward. A striking die 12 with a tip having a 1 / 8" R was then set, and a 0.5 kg weight 13 was dropped from a height of 1.0 m. The condition of the multilayer body after the impact test was evaluated as follows. A: No scattering (for example, even if there is a crack, no separate pieces are generated) B: Shattered (e.g., broken into separate pieces)

[0099] <Refractive index measurement method> The refractive indices of various resins, thermoplastic resin components and glass fillers were measured as follows. The refractive index of various resins and thermoplastic resin components was measured by the following method. A flat test piece (90 mm x 50 mm x 1 mm thick) for measuring the refractive index was prepared, and the refractive index at a wavelength of 486 nm was measured. The refractive index was measured using a "MODEL2010 Prism Coupler" manufactured by Seki Technotron Co., Ltd. A flat test piece (90 mm × 50 mm × 1 mm thick) for measuring the refractive index was prepared by drying a resin or a resin composition pellet obtained by removing the glass filler from the resin composition pellet, which was produced in the same manner as described above, at 100°C for 5 hours, and then injection-molding the dried resin or resin composition pellet at a cylinder set temperature of 280°C, a mold temperature of 80°C, a screw rotation speed of 100 rpm, and an injection speed of 100 mm / s using an injection molding machine (manufactured by The Japan Steel Works, Ltd., "J55-60H") The refractive index of the glass filler was calculated by preparing a flat test piece of the resin composition (a mixture of a thermoplastic resin component and a glass filler) and subtracting the refractive index of the thermoplastic resin component from the refractive index of the test piece. Further, the refractive index difference (refractive index of thermoplastic resin component - refractive index of glass filler, absolute value) was calculated from the obtained refractive index.

[0100] [Table 2]

[0101] [Table 3]

[0102] [Table 4]

[0103] [Table 5]

[0104] [Table 6]

[0105] In Tables 2 to 6, the resin refractive index refers to the refractive index of the thermoplastic resin component at a wavelength of 486 nm, the GF refractive index refers to the refractive index of the glass filler at a wavelength of 486 nm, and the refractive index difference refers to the difference between the refractive index of the thermoplastic resin component at a wavelength of 486 nm and the refractive index of the glass filler at a wavelength of 486 nm. As is clear from the above results, the multilayer body of the present invention achieved high transparency and was also excellent in shatter resistance and visibility. [Explanation of symbols]

[0106] 1 Multilayer body 2 Base material 10. DuPont Impact Test Apparatus 11 Cradle 12 Shooting type 13 Weight 21 Resin composition for forming base material 3 Outer film 31 Hard coat layer 32 (Meth)acrylate polymer layer 33 Polycarbonate resin layer 4. Mold 5 Injection molding machine

Claims

1. a polycarbonate resin containing a structural unit represented by formula (1); a thermoplastic resin other than a polycarbonate resin containing a structural unit represented by formula (1); A glass filler; A substrate formed from a resin composition comprising: an outer film on at least one of the outer surfaces of the substrate; the difference in refractive index between the thermoplastic resin component and the glass filler contained in the resin composition is 0.0009 or less; the glass filler comprises glass fibers having a flattened cross section; A multilayer body, wherein the content of the glass filler in the resin composition is 15% by mass or more in the resin composition. Formula (1) 【Chemistry 1】 (In formula (1), R １ represents a methyl group, R ２ represents a hydrogen atom or a methyl group, and X １ represents one of the following formulas: 【Chemistry 2】 R ３ and R ４ each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

2. The multilayer body described in claim 1, wherein the resin composition is injection molded at a mold temperature of 100°C, converted to a thickness of 2 mm, and the haze (unit: %) measured in accordance with JIS K-7105 is divided by the glass filler content (mass %), and the value obtained is 0.30 or less.

3. The polycarbonate resin further contains a structural unit represented by formula (2): The multilayer body according to claim 1 or 2. Formula (2) 【Transformation 3】 (In formula (2), X ２ represents one of the following formulas: 【Chemistry 4】 R ３ and R ４ each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

4. 4. The multilayer body according to claim 1, wherein the refractive index of the other thermoplastic resin is 1.4900 to 1.5500.

5. 5. The multilayer body according to claim 1, wherein the proportion of the structural unit represented by formula (1) in the polycarbonate resin is 5% by mass or more.

6. The multilayer body according to any one of claims 1 to 5, wherein the other thermoplastic resin comprises a (meth)acrylate polymer.

7. The multilayer body according to claim 6 , wherein the (meth)acrylate polymer comprises an aromatic (meth)acrylate structural unit (b1).

8. The multilayer body according to claim 6, wherein the (meth)acrylate polymer comprises an aromatic (meth)acrylate structural unit (b1) and a methyl methacrylate structural unit (b2), and the mass ratio thereof (b1 / b2) is 5 to 50 / 50 to 95.

9. The multilayer body according to any one of claims 1 to 8, wherein the outer film comprises a layer comprising a polycarbonate resin.

10. 10. The multilayer body of claim 9, wherein the outer film comprises a layer having a higher pencil hardness than the layer comprising the polycarbonate resin.

11. The multilayer body according to any one of claims 1 to 10, wherein the outer film comprises a layer comprising a (meth)acrylic polymer.

12. The multilayer body according to any one of claims 1 to 11, wherein the outer film comprises a hard coat layer.

13. The multilayer body according to any one of claims 1 to 12, which has an outer film on each of the outer surfaces of the substrate.

14. A molded article comprising the multilayer body according to any one of claims 1 to 13.

15. The molded article according to claim 14, wherein the molded article is a display part, a mobile information terminal part, a home appliance, or an interior furnishing.

16. A method for producing the multilayer body according to any one of claims 1 to 13, comprising injection molding by injecting a melt of the resin composition into a mold in which an outer film is placed.

17. The method for producing a multilayer body according to claim 16, wherein the outer film has a layer containing a polycarbonate resin.

18. 18. The method for producing a multilayer body according to claim 17, wherein the outer film has a layer having a higher pencil hardness than the layer containing the polycarbonate resin, and the outer film is loaded so that the layer having the higher pencil hardness is in contact with the mold.

19. The method for producing a multilayer body according to claim 16 or 17, wherein the outer film has a layer containing a (meth)acrylic polymer, and the outer film is loaded so that the layer containing the (meth)acrylic polymer comes into contact with the mold.

20. The method for producing a multilayer body according to claim 16 or 17, wherein the outer film has a hard coat layer, and the outer film is loaded so that the hard coat layer comes into contact with the mold.

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