Resin composition, plate-shaped molded body, multilayer body, and method for manufacturing molded article

Abstract

To provide a resin composition for producing a polycarbonate resin film or sheet that prevents occurrence of springback even when subjected to heat bend molding together with an acrylic resin layer and that can provide a multilayer body having excellent moist heat resistance, and a tabular molding, a multilayer body and a method for producing a molding each of which uses the resin composition.SOLUTION: A resin composition includes an aromatic polycarbonate resin having a terminal structure represented by the following formula, of 70-99 pts.mass, a phosphate of 1-12 pts.mass, and a thermoplastic resin different from the aromatic polycarbonate resin, of 0-29 pts.mass, where R1 is a C8-36 alkyl group or a C8-30 alkenyl group.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Polycarbonate resin is widely used in various fields because, in addition to its excellent transparency, it has superior processability and impact resistance compared to glass, and it does not generate toxic gases like other plastic materials. It is also used as a material for thermoforming, such as vacuum forming and pressure forming.

[0003] On the other hand, polycarbonate resin generally has low surface hardness, making molded products made from polycarbonate resin prone to scratches. Therefore, when polycarbonate resin is made into a film, it is being considered to form a layer containing acrylic resin or a hard coat layer (protective layer) on the surface to prevent scratches on the product surface. For example, Patent Document 1 discloses a laminated sheet for molding, which has a coating layer mainly composed of an acrylic resin (B) on one side of a base layer mainly composed of a polycarbonate resin composition (A) consisting of a polymer alloy of aromatic polycarbonate (A1) and another resin (A2), characterized in that the absolute value of the difference in glass transition temperatures between the polycarbonate resin composition (A) and the acrylic resin (B) is 30°C or less. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2009-196153 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] As described above, when a multilayer structure consisting of an acrylic resin layer and a hard coat layer is formed on a film or sheet made of polycarbonate resin, the acrylic resin generally has a lower glass transition temperature than the polycarbonate resin. Therefore, when thermoforming, especially when using a mold with a small radius of curvature, the acrylic resin layer may stretch too much, and the hard coat may not be able to follow the deformation, causing cracks to occur in the hard coat layer. To resolve this, thermoforming at a low temperature to suppress the deformation of the acrylic can be considered. However, when thermoforming a multilayer structure at a low temperature, a phenomenon called springback occurs, where the multilayer structure returns to its original shape after thermoforming. Furthermore, it has been found that changes in appearance may occur when the above-mentioned multilayer structure is subjected to a moist heat resistance test. The present invention aims to solve the above problems and provides a resin composition for manufacturing a polycarbonate resin film or sheet that does not exhibit springback even when heat-bent together with an acrylic resin layer and provides a multilayer body with excellent moisture and heat resistance, as well as a method for manufacturing a flat molded body, a multilayer body, and a molded product using the resin composition. [Means for solving the problem]

[0006] Based on the above problems, the inventors conducted research and found that the above problems can be solved by using a resin composition containing an aromatic polycarbonate resin having a predetermined terminal structure and a phosphate ester. Specifically, the above problem was solved by the following means. <1> A resin composition comprising 70 to 99 parts by mass of an aromatic polycarbonate resin having an end structure represented by formula (1), 1 to 12 parts by mass of a phosphate ester, and 0 to 29 parts by mass of another thermoplastic resin other than the aromatic polycarbonate resin having an end structure represented by formula (1). [ka] (In formula (1), R 1 R represents an alkyl group having 8 to 36 carbon atoms, or an alkenyl group having 8 to 30 carbon atoms. 2Each of these independently represents a halogen atom, an alkyl group with 1 to 20 carbon atoms, or an aryl group with 6 to 12 carbon atoms. n represents an integer from 0 to 4. * indicates a bonding site with another part. <2> The other thermoplastic resin includes an aromatic polycarbonate resin having an end structure represented by formula (2). <1> The resin composition described above. [ka] (In formula (2), R 2 Each of these independently represents a halogen atom, an alkyl group with 1 to 20 carbon atoms, or an aryl group with 6 to 12 carbon atoms. t-Bu represents a t-butyl group. n represents an integer from 0 to 4. * indicates a bonding site with another part. <3> The glass transition temperature of the resin composition, as determined by differential scanning calorimetry, is 120°C or lower. <1> or <2> The resin composition described above. <4> The glass transition temperature of the resin composition, as determined by differential scanning calorimetry, is 100°C or higher. <1> ~ <3> A resin composition as described in any one of the following. <5> The phosphate ester contains an aromatic ring, <1> ~ <4> A resin composition as described in any one of the following. <6> The resin composition is molded into a flat plate-shaped molded body with a thickness of 100 μm, and the haze after treatment at 85°C and 85% relative humidity for 200 hours is 20% or less. <1> ~ <5> A resin composition as described in any one of the following. <7> When the resin composition is treated at 85°C and 85% relative humidity for 200 hours, the difference in weight-average molecular weight (Mw) before and after treatment is 10,000 or less. <1> ~ <6> A resin composition as described in any one of the following. <8> <1> ~ <7> A flat molded article formed from any one of the resin compositions described above. <9> The thickness is 10 to 5,000 μm. <8> A flat molded body as described above. <10> <8> or <9> A multilayer body having a flat molded body as described above and a layer containing acrylic resin. <11> The total thickness of the aforementioned multilayer is 10 to 10,000 μm. <10> The multilayer described above. <12>Furthermore, there is a hard coat layer, and the hard coat layer is laminated in the order of a flat molded body, a layer containing an acrylic resin, and the hard coat layer, the multilayer body according to <10> or <11>. <13>A molded article formed from the multilayer body according to any one of <10> to <12>, having a portion with a radius of curvature of 50 mmR or less, a molded article. <14>A method for manufacturing a molded article, including thermally bending and molding the multilayer body according to any one of <10> to <12> at 105 to 117°C. <15>The method for manufacturing a molded article according to <14>, wherein the molded article has a portion with a radius of curvature of 50 mmR or less.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a resin composition for manufacturing a polycarbonate resin film or sheet that can provide a multilayer body that does not generate springback even when thermally bent and molded together with an acrylic resin layer and has excellent heat and humidity resistance, and methods for manufacturing a flat molded body, a multilayer body, and a molded article using the resin composition.

Brief Description of the Drawings

[0008] [Figure 1] FIG. 1 is a diagram schematically showing the layer structure of the multilayer body of the present invention.

Modes for Carrying Out the Invention

[0009] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the following present embodiment is an exemplification for explaining the present invention, and the present invention is not limited only to the present embodiment. In this specification, "~" is used in the sense of including the numerical values described before and after it as lower and upper limits. In this specification, various physical property values and characteristic values are assumed to be those at 23°C unless otherwise specified. In this specification, "flat molded articles" and "multilayer articles" include those in the form of films or sheets, respectively. "Film" and "sheet" refer to molded articles that are thin in thickness relative to their length and width, and are generally flat. There is no clear distinction between "film" and "sheet," but generally, those with a thickness of 250 μm or less are called "films," and those with a thickness of 250 μm or more are called "sheets." Furthermore, "films" and "sheets" in this specification may be single-layer or multilayer. In this specification, "parts by mass" refers to the relative amount of a component, and "mass%" refers to the absolute amount of a component. In this specification, "(meth)acrylic" refers to both acrylic and methacrylic, or either of them. Furthermore, in this specification, a flat molded body formed from the resin composition of this embodiment may be referred to as a "polycarbonate resin film" or "polycarbonate resin sheet," and a layer containing acrylic resin may be referred to as an "acrylic resin layer." If the standards described herein differ in measurement methods, etc., from year to year, unless otherwise specified, the standards in effect at the time of filing shall apply.

[0010] The resin composition of this embodiment is characterized by comprising 70 to 99 parts by mass of an aromatic polycarbonate resin having an end structure represented by formula (1), 1 to 12 parts by mass of a phosphate ester, and 0 to 29 parts by mass of another thermoplastic resin other than the aromatic polycarbonate resin having an end structure represented by formula (1). With this configuration, it is possible to provide a polycarbonate resin film or sheet that does not experience springback and provides a multilayer material with excellent resistance to humid heat. Furthermore, a polycarbonate resin film or sheet can be obtained that has low initial haze and haze after the humid heat test, and small molecular weight change after the humid heat test. In addition, when an acrylic resin layer and the polycarbonate resin film or sheet are made into a multilayer material, it is possible to suppress the occurrence of flow marks and foreign matter, and to suppress the occurrence of cracks after thermal bending. [ka] (In formula (1), R 1 R represents an alkyl group having 8 to 36 carbon atoms, or an alkenyl group having 8 to 30 carbon atoms. 2 Each of these independently represents a halogen atom, an alkyl group with 1 to 20 carbon atoms, or an aryl group with 6 to 12 carbon atoms. n represents an integer from 0 to 4. * indicates a bonding site with another part.

[0011] The reason for this was hypothesized to be that by using an aromatic polycarbonate resin having a predetermined end structure and incorporating a phosphate ester, the glass transition temperature of the resin composition could be lowered while minimizing the impact on other properties. As a result, thermal degradation of the resin composition after the moist heat test was suppressed. Furthermore, it was hypothesized that when a multilayer structure of polycarbonate resin film or sheet and acrylic resin layer was formed, the difference in glass transition temperatures between the polycarbonate resin film or sheet and the acrylic resin layer would be small, resulting in a multilayer structure with excellent thermal bending properties. Adding additives to a resin lowers the glass transition temperature, but this usually negatively affects other properties. For example, phosphite esters readily react with peroxides in the resin. In this embodiment, various additives were investigated, and phosphate esters were found to be suitable.

[0012] <Aromatic polycarbonate resin> The resin composition of this embodiment includes an aromatic polycarbonate resin having an end structure represented by formula (1). By using an aromatic polycarbonate resin having an end structure represented by formula (1), the glass transition temperature of the polycarbonate resin can be lowered. [ka] (In formula (1), R 1 R represents an alkyl group having 8 to 36 carbon atoms, or an alkenyl group having 8 to 30 carbon atoms. 2Each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms. n represents an integer of 0 to 4. * represents a bonding site with other sites.)

[0013] R 1 represents an alkyl group having 8 to 36 carbon atoms or an alkenyl group having 8 to 30 carbon atoms, preferably an alkyl group or an alkenyl group having 10 or more carbon atoms, more preferably an alkyl group or an alkenyl group having 12 or more carbon atoms, and still more preferably an alkyl group or an alkenyl group having 14 or more carbon atoms. Thereby, the glass transition temperature of the resin is lowered, and the thermal bending property of the multilayer body is improved. Also, R 1 is preferably an alkyl group or an alkenyl group having 22 or less carbon atoms, more preferably an alkyl group or an alkenyl group having 18 or less carbon atoms. Thereby, the compatibility with other resins is improved. R 1 is preferably an alkyl group. The alkyl group and the alkenyl group are preferably a linear or branched alkyl group or alkenyl group, more preferably a linear alkyl group or alkenyl group. In this embodiment, R 1 is particularly preferably a hexadecyl group. Also, R 1 may be located at any of the meta-position, para-position, and ortho-position, preferably at the meta-position or para-position, and more preferably at the para-position.

[0014] R 2 Each independently represents a halogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, preferably a fluorine atom, a chlorine atom, a methyl group, an ethyl group, or a phenyl group, more preferably a fluorine atom, a chlorine atom or a methyl group. n represents an integer of 0 to 4, preferably an integer of 0 to 2, more preferably 0 or 1, and still more preferably 0.

[0015] The terminal structure represented by formula (1) can be added to a polycarbonate resin by using an end-capturing agent such as hexadecyl parahydroxybenzoate. Details thereof can be found in paragraphs 0022 to 0030 of Japanese Patent Application Publication No. 2019-002023, and these contents are incorporated herein by reference. The aromatic polycarbonate resin having the terminal structure represented by formula (1) in this embodiment may have one or more terminal structures represented by formula (1).

[0016] In this embodiment, the aromatic polycarbonate resin having the terminal structure represented by formula (1) is preferably a bisphenol-type polycarbonate resin, and more preferably a bisphenol A-type polycarbonate resin. Furthermore, it is preferable that 50 mol% or more of the bisphenol-type polycarbonate resin has at least one terminal structure represented by formula (1).

[0017] Bisphenol A type polycarbonate resin may also have other structural units other than carbonate structural units derived from bisphenol A and its derivatives. Examples of dihydroxy compounds constituting such other structural units include aromatic dihydroxy compounds described in paragraph 0014 of Japanese Patent Application Publication No. 2018-154819, the details of which are incorporated herein by reference. In this embodiment, the bisphenol-type polycarbonate resin preferably contains carbonate structural units derived from bisphenol A and its derivatives accounting for 90% or more by mass of all structural units excluding terminal structures, more preferably 95% or more by mass, and even more preferably 97% or more by mass.

[0018] The method for producing bisphenol A type polycarbonate resin is not particularly limited, and any method can be used. Examples include interfacial polymerization, molten transesterification, pyridine method, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers.

[0019] The weight-average molecular weight of the aromatic polycarbonate resin having the terminal structure represented by formula (1) is not particularly defined, but is preferably 10,000 or more, more preferably 20,000 or more, even more preferably 30,000 or more, even more preferably 40,000 or more, and even more preferably 50,000 or more. Setting it above the lower limit tends to further improve the impact resistance of the multilayer and suppression of flow marks during molding. Furthermore, the weight-average molecular weight of the aromatic polycarbonate resin having the terminal structure represented by formula (1) is preferably 200,000 or less, more preferably 150,000 or less, even more preferably 100,000 or less, even more preferably 80,000 or less, and even more preferably 60,000 or less. Setting it below the upper limit tends to improve the moldability of the multilayer.

[0020] The glass transition temperature of the aromatic polycarbonate resin having the terminal structure represented by formula (1) used in this embodiment is preferably 145°C or lower, more preferably 140°C or lower, even more preferably 135°C or lower, even more preferably 130°C or lower, and even more preferably 125°C or lower. Setting it below the upper limit tends to further improve the heat-bending moldability of the multilayer. Furthermore, the glass transition temperature of the aromatic polycarbonate resin having the terminal structure represented by formula (1) used in this embodiment is preferably 121°C or higher, more preferably 122°C or higher, and even more preferably 123°C or higher. Setting it above the lower limit tends to further improve the durability in environmental resistance tests such as humid heat tests and high-temperature tests.

[0021] <Other thermoplastic resins> The resin composition of this embodiment may also contain other thermoplastic resins other than aromatic polycarbonate resins having the end structure represented by formula (1). By including other thermoplastic resins, the durability in environmental resistance tests such as moist heat tests and high-temperature tests tends to be improved while adjusting the glass transition temperature of the resin. Other thermoplastic resins are not specifically defined and any known thermoplastic resins can be used, as long as they are thermoplastic resins that can be melt-blended with aromatic polycarbonate resins having the terminal structure represented by formula (1). Other thermoplastic resins include other polycarbonate resins other than aromatic polycarbonate resins having the end structure represented by formula (1), polyester resins (preferably aromatic polyester resins), and acrylic resins (preferably aromatic acrylic resins), with other polycarbonate resins other than aromatic polycarbonate resins having the end structure represented by formula (1) being preferred. As the other polycarbonate resins mentioned above, aromatic polycarbonate resins are preferred, and bisphenol A type polycarbonate resins are more preferred. The other polycarbonate resin is preferably an aromatic polycarbonate resin having an end structure represented by formula (2). By using such an aromatic polycarbonate resin, in addition to the effects described above, the transparency of the flat molded article tends to be further improved. [ka] (In formula (2), R 2 Each of these independently represents a halogen atom, an alkyl group with 1 to 20 carbon atoms, or an aryl group with 6 to 12 carbon atoms. t-Bu represents a t-butyl group. n represents an integer from 0 to 4. * indicates a bonding site with another part.

[0022] In formula (2), R 2 and n are, respectively, R in equation (1). 2 This is synonymous with n, and the preferred range is also similar. The aromatic polycarbonate resin having the terminal structure represented by formula (2) in this embodiment may have one or more terminal structures represented by formula (2).

[0023] In this embodiment, the aromatic polycarbonate resin having the terminal structure represented by formula (2) is preferably a bisphenol A type polycarbonate resin. Furthermore, it is preferable that 50 mol% or more of the bisphenol A type polycarbonate resin has at least one terminal structure represented by formula (2).

[0024] Bisphenol A type polycarbonate resin may also have other structural units other than carbonate structural units derived from bisphenol A and its derivatives. Examples of dihydroxy compounds constituting such other structural units include aromatic dihydroxy compounds described in paragraph 0014 of Japanese Patent Application Publication No. 2018-154819, the details of which are incorporated herein by reference. In this embodiment, the bisphenol-type polycarbonate resin preferably contains carbonate structural units derived from bisphenol A and its derivatives accounting for 90% or more by mass of all structural units excluding terminal structures, more preferably 95% or more by mass, and even more preferably 97% or more by mass.

[0025] The weight-average molecular weight of the other thermoplastic resin (preferably an aromatic polycarbonate resin having an end structure represented by formula (2)) is not particularly specified, but is preferably 10,000 or more, more preferably 20,000 or more, even more preferably 30,000 or more, even more preferably 40,000 or more, and even more preferably 50,000 or more. Setting it above the lower limit tends to further improve the impact resistance of the multilayer and the suppression of flow marks during molding. Furthermore, the weight-average molecular weight of the other thermoplastic resin (preferably an aromatic polycarbonate resin having an end structure represented by formula (2)) is preferably 200,000 or less, more preferably 150,000 or less, even more preferably 100,000 or less, even more preferably 80,000 or less, and even more preferably 60,000 or less. Setting it below the upper limit tends to improve compatibility with the aromatic polycarbonate resin having an end structure represented by formula (1), and further improve the transparency of the molded product.

[0026] The glass transition temperature of the other thermoplastic resin used in this embodiment (preferably an aromatic polycarbonate resin having an end structure represented by formula (2)) is preferably 155°C or lower, more preferably 154°C or lower, even more preferably 153°C or lower, even more preferably 152°C or lower, and even more preferably 151°C or lower. Setting it below the upper limit tends to further improve the heat-bending moldability of the multilayer. Furthermore, the glass transition temperature of the other thermoplastic resin used in this embodiment (preferably an aromatic polycarbonate resin having an end structure represented by formula (2)) is preferably 145°C or higher. Setting it above the lower limit tends to further improve the durability in environmental resistance tests such as humid heat tests and high-temperature tests.

[0027] <Phosphate esters> The resin composition of this embodiment contains a phosphate ester. By including a phosphate ester, the glass transition temperature of the resulting polycarbonate resin film or sheet can be lowered, and the influence on other properties can be suppressed. The type of phosphate ester is not specifically defined, and a wide range of known compounds can be used. The phosphate ester preferably contains aromatic rings, more preferably contains two or more aromatic rings, and even more preferably contains two to ten aromatic rings. The inclusion of aromatic rings improves compatibility with aromatic resin compounds and enhances the transparency of the molded product. Furthermore, the phosphate ester is preferably a condensed phosphate ester, its derivative compounds, or their condensates. Using condensed phosphate esters, their derivative compounds, or their condensates results in lower volatility than ordinary phosphate esters, making it less likely to generate gases during molding. It also has a larger molecular weight than ordinary phosphate esters, which helps prevent a decrease in the overall mechanical properties of the resin. Moreover, in this embodiment, the phosphate ester is preferably an aromatic condensed phosphate ester, its derivative compounds, or their condensates, and even more preferably an aromatic condensed phosphate ester. The phosphate ester may further contain halogen atoms, but it is preferable that it does not contain halogen atoms. From the viewpoint of compatibility and dispersibility with resin components, the molecular weight of the phosphate ester is preferably between 500 and 1500.

[0028] Examples of phosphate esters that can be used in this embodiment include the following: Aromatic phosphate esters such as monoethyl phosphate, monobutyl phosphate, methyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, dibutyl phosphate, trimethyl phosphate (TMP), triethyl phosphate (TEP), triphenyl phosphate (TPP), tricresyl phosphate (TCP), trixylenyl phosphate (TXP), cresyl diphenyl phosphate (CDP), 2-ethylhexyl diphenyl phosphate (EHDP), and their derivative compounds and condensates. • Reaction products of phosphorus oxychloride with divalent phenolic compounds and phenols (or alkylphenols). For example, aromatic condensed phosphate esters such as resorcinol bis-diphenyl phosphate, resorcinol poly(di-2,6-xylyl) phosphate, and bisphenol A polycresyl phosphate, and their derivative compounds and condensates.

[0029] Tris(chloroethyl) phosphate, tris(chloropropyl) phosphate, tris(dichloropropyl) phosphate, tris(dibromopropyl) phosphate, bis(2,3-dibromopropyl)-2,3-dichloropropyl phosphate, bis(chloropropyl)octyl phosphate, etc., and their derivative compounds and condensates.

[0030] Examples of commercially available products include "JAMP-2", "JAMP-4P", "JP-501", "JP-502", "JP-504", and "DBP" from Johoku Chemical Co., Ltd., and "TMP", "TEP", "TPP", "TCP", "TXP", "CDP", "PX-110", "#41", "CR-733S", "CR-741", "PX-200", "DAIGUARD-400 / 540 / 580 / 610", "TMCPP", "CRP", "CR-900", "CR-504L", "CR-570", and "DAIGUARD-540" from Daihachi Chemical Industry Co., Ltd.

[0031] The phosphate ester content in the resin composition of this embodiment is preferably 1 to 12% by mass. A content of 1% by mass or more effectively suppresses springback, while a content of 12% by mass or less effectively suppresses warping of the multilayer body after thermoforming. The upper limit of the phosphate ester content is preferably 8% by mass or less, and more preferably 6% by mass or less. The lower limit is preferably 1.5% or more, and more preferably 2% or more.

[0032] <Blend of each ingredient> In the resin composition of this embodiment, the blend ratio of the aromatic polycarbonate resin having the terminal structure represented by formula (1), the phosphate ester, and the other thermoplastic resin is 70-99 parts by mass: 1-12 parts by mass: 0-29 parts by mass, and more preferably 74-99 parts by mass: 1-8 parts by mass: 0-25 parts by mass. By using such a ratio, a resin composition with a good balance of properties such as thermal bending characteristics can be obtained. If the resin composition of this embodiment does not contain other thermoplastic resins, the blend ratio of the aromatic polycarbonate resin having the terminal structure represented by formula (1) and the phosphate ester is preferably 90 to 99 parts by mass: 10 to 1 part by mass, more preferably 93 to 98 parts by mass: 7 to 2 parts by mass, and even more preferably 94 to 98 parts by mass: 6 to 2 parts by mass. When the resin composition of this embodiment includes other thermoplastic resins, the blend ratio of the aromatic polycarbonate resin having the terminal structure represented by formula (1), the phosphate ester, and the other thermoplastic resin is preferably 70-94 parts by mass: 1-12 parts by mass: 5-35 parts by mass, and more preferably 70-80 parts by mass: 2-7 parts by mass: 10-30 parts by mass. The other thermoplastic resin is preferably an aromatic polycarbonate resin, and more preferably an aromatic polycarbonate resin having the terminal structure represented by formula (2), as described above. In this embodiment, the total amount of the aromatic polycarbonate resin having the terminal structure represented by formula (1), the phosphate ester, and the other thermoplastic resin preferably accounts for 95% by mass or more, preferably 98% by mass or more, and may also be 99% by mass or more. Furthermore, the upper limit of the total amount is 100% by mass or less. The resin composition of this embodiment may contain only one aromatic polycarbonate resin having the terminal structure represented by formula (1), a phosphate ester, and, if necessary, the other thermoplastic resins, each of which may be blended, or it may contain two or more of each. When two or more are included, it is preferable that the total amount is within the above range.

[0033] <Other ingredients> In addition to the above, the resin composition of this embodiment may also contain release agents, heat stabilizers, flame retardants, flame retardant enhancers, ultraviolet absorbers, colorants, antistatic agents, fluorescent whitening agents, antifogging agents, flow modifiers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact modifiers, sliding modifiers, hue modifiers, acid trapping agents, etc. One of these components may be used, or two or more may be used in combination. The total amount of the other components mentioned above, if present, is preferably 0.001 to 5% by mass of the resin composition, more preferably 0.001 to 2% by mass, and even more preferably 0.01 to 1% by mass. Antiblocking refers to the effect of suppressing adhesion between films, and can be achieved by adding an antiblocking agent, etc.

[0034] <<Release agent>> The resin composition of this embodiment preferably contains a release agent. By including a release agent, a polycarbonate resin film or sheet with superior release properties can be obtained. Examples of release agents include at least one compound selected from the group consisting of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, and polysiloxane-based silicone oils, with esters of aliphatic carboxylic acids and alcohols being preferred. Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture mainly composed of myricyl palmitate), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate, glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate. In addition, as release agents, the release agents described in paragraph 0032 of Japanese Patent Publication No. 2017-226848 and paragraph 0056 of Japanese Patent Publication No. 2018-199745 can be used, and this information is incorporated herein.

[0035] The content of the mold release agent in the resin composition, if present, is preferably 0.001 parts by mass or more, more preferably 0.005 parts by mass or more, and also preferably 2 parts by mass or less, more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of the resin component. One type of release agent may be used, or two or more types may be used. If two or more types are used, it is preferable that the total amount be within the above range.

[0036] <Physical properties of resin compositions> The resin composition of this embodiment preferably has a glass transition temperature of 120°C or lower, more preferably 119°C or lower, even more preferably 118°C or lower, even more preferably 117°C or lower, and even more preferably 116°C or lower. Setting it below the upper limit tends to further improve the effect of suppressing springback during thermal bending. Furthermore, the resin composition of this embodiment preferably has a glass transition temperature of 100°C or higher, more preferably 102°C or higher, even more preferably 105°C or higher, even more preferably 107°C or higher, and even more preferably 110°C or higher. Setting it above the lower limit tends to further improve the durability in environmental resistance tests such as humid heat tests and high-temperature tests. The glass transition temperature is measured according to the method described in the examples below.

[0037] The resin composition of this embodiment is preferably characterized by excellent transparency after a humid and heat resistance test. Specifically, the resin composition of this embodiment is molded into a flat plate-shaped molded body with a thickness of 100 μm, and after treatment at 85°C and 85% relative humidity for 200 hours, the haze is preferably 20% or less, more preferably 10% or less, even more preferably 5% or less, even more preferably 2% or less, and even more preferably 1% or less. The lower limit of the haze is ideally 0%, but 0.01% or more is practical. The resin composition of this embodiment preferably has a difference in weight-average molecular weight (Mw) before and after treatment at 85°C and 85% relative humidity for 200 hours of treatment of 10,000 or less, more preferably 8,000 or less, and even more preferably 6,000 or less. The lower limit of the difference is ideally 0, but 100 or more is practical.

[0038] <Flat-shaped molded body> The resin composition of this embodiment is preferably used in the form of a flat molded body. That is, the flat molded body of this embodiment is formed from the resin composition of this embodiment. The flat molded body of this embodiment has excellent resistance to moisture and heat. Examples of flat molded bodies include plates, films, and sheets. Furthermore, as will be described in detail later, the flat molded body may be included in a multilayer structure laminated on other substrates. Also, the flat molded body of this embodiment may be subjected to bending or other processes after being incorporated into a part of the multilayer structure. The thickness of the flat molded body is preferably 10 μm or more, more preferably 20 μm or more, even more preferably 50 μm or more, and may be 100 μm or more. Setting the thickness above the lower limit makes molding easier and tends to improve hardness. There is no particular upper limit to the thickness of the flat molded body, but it is practical to keep it at 5,000 μm or less. The flat molded body of this embodiment is formed by injection molding, extrusion molding using a T-die, or the like.

[0039] <Multilayer body> The flat molded body of this embodiment can be used as a multilayer body. The multilayer body of this embodiment has the flat molded body of this embodiment and a layer containing acrylic resin (acrylic resin layer). There are no particular restrictions on the thickness (total thickness) of the multilayer, but it is preferably 10 μm or more, and more preferably 20 μm or more. Furthermore, the thickness of the multilayer is preferably 10,000 μm or less, more preferably 5,000 μm or less, and may also be 2,000 μm or less. The multilayer body of this embodiment preferably further includes a hard coat layer. Providing a hard coat layer tends to further improve the surface hardness of the multilayer body. The hard coat layer is preferably laminated in the order of a flat molded body, a layer containing acrylic resin, and the hard coat layer. Figure 1 is a schematic diagram showing an example of a multilayer body of this embodiment, where, as described above, 1 represents the multilayer body, 2 represents a flat molded body (polycarbonate resin film or sheet), 3 represents an acrylic resin layer, and 4 represents a hard coat layer. The flat molded body 2, the acrylic resin layer 3, and the hard coat layer 4 may have other layers as long as they are laminated in the order described above, without departing from the spirit of this embodiment, but it is preferable that they do not have other layers, that is, that they are adjacent to each other.

[0040] Next, the acrylic resin layer will be described. The acrylic resin layer included in the multilayer body of this embodiment is a layer containing acrylic resin (preferably a layer in which 80% or more by mass of the layer is acrylic resin, and more preferably 90% or more by mass of the layer is acrylic resin). The inclusion of such an acrylic resin layer in the multilayer body of this embodiment tends to further improve the hardness of the multilayer body (especially the pencil hardness). The thickness of the acrylic resin layer is preferably 10 μm or more, more preferably 20 μm or more, even more preferably 40 μm or more, even more preferably 60 μm or more, and even more preferably 80 μm or more. The upper limit of the thickness of the acrylic resin layer is preferably 300 μm or less, more preferably 200 μm or less, even more preferably 180 μm or less, even more preferably 150 μm or less, and even more preferably 120 μm or less. By having such a layer thickness, sufficient scratch resistance and impact resistance can be obtained.

[0041] The acrylic resin used in this embodiment is a polymer of (meth)acrylate or a polymer of (meth)acrylate and other monomers other than (meth)acrylate, and there are no particular restrictions on its type. The polymer of (meth)acrylate and other monomers other than (meth)acrylate preferably has a (meth)acrylate content of 50 mol% or more, and more preferably 60 mol% or more. The (meth)acrylate may be an aliphatic (meth)acrylate or an aromatic (meth)acrylate, and it is preferable that it contains an aliphatic (meth)acrylate. By using a polymer in which aliphatic (meth)acrylate is the main component (for example, 90% by mass or more), the generation of foreign matter in the resulting multilayer can be effectively suppressed. Other monomers besides (meth)acrylates include styrene monomers such as styrene, maleimide monomers such as maleic anhydride and N-phenylmaleimide, glutaric acid, and glutarimide. Monomers that form lactone ring units are also preferably used.

[0042] In this embodiment, the acrylic resin can be an aliphatic (meth)acrylate, for example, a polymer of at least one of methyl methacrylate, methyl acrylate, and ethyl acrylate. Among these, methyl methacrylate resin (PMMA: also called polymethyl (meth)acrylate), in which the main component (for example, 85% by mass or more) is polymerized from methyl methacrylic acid, is preferred.

[0043] The weight-average molecular weight of the acrylic resin is not particularly defined, but is preferably 10,000 or more, more preferably 30,000 or more, even more preferably 50,000 or more, even more preferably 60,000 or more, and even more preferably 70,000 or more. Setting it above the lower limit tends to effectively suppress crack formation during thermal bending. Furthermore, the weight-average molecular weight of the acrylic resin is preferably 250,000 or less, more preferably 200,000 or less, even more preferably 150,000 or less, even more preferably 100,000 or less, and even more preferably 90,000 or less. Setting it below the upper limit tends to further improve the effect of suppressing flow mark formation during multilayer molding.

[0044] The glass transition temperature of the acrylic resin layer used in this embodiment is preferably 113°C or higher, more preferably 114°C or higher, even more preferably 115°C or higher, even more preferably 117°C or higher, and even more preferably 120°C or higher. Setting it above the lower limit tends to further improve the effect of preventing crack formation in molded products during the thermal bending molding of multilayer bodies. There is no particular upper limit, but for example, 200°C or lower is practical.

[0045] The acrylic resin layer is preferably formed from a composition containing acrylic resin (composition for forming an acrylic resin layer). The composition containing acrylic resin may also contain other components in addition to the acrylic resin, as long as it does not depart from the spirit of this embodiment. Specifically, other components include other thermoplastic resins, heat stabilizers, flame retardants, flame retardant additives, ultraviolet absorbers, colorants, antistatic agents, fluorescent whitening agents, antifogging agents, flow modifiers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact modifiers, sliding modifiers, hue modifiers, acid trapping agents, etc. One of these components may be used, or two or more may be used in combination. The total amount of the above-mentioned other components in the acrylic resin layer-forming composition is preferably 0.001 to 5% by mass, more preferably 0.001 to 2% by mass, and even more preferably 0.01 to 1% by mass, if present.

[0046] Next, the details of the hard coat layer will be described. The hard coat layer that may be included in the multilayer of this embodiment is a layer with a higher surface hardness than the polycarbonate resin film or sheet. By including such a hard coat layer, the surface hardness of the multilayer or molded product can be increased. The thickness of the hard coat layer is preferably 0.5 μm or more, more preferably 1 μm or more, even more preferably 2 μm or more, even more preferably 4 μm or more, and even more preferably 5 μm or more. Setting it above the lower limit tends to further improve the pencil hardness of the entire multilayer structure due to the hard coat layer. The upper limit of the hard coat layer thickness is preferably 20 μm or less, more preferably 15 μm or less, even more preferably 12 μm or less, even more preferably 10 μm or less, and even more preferably 8 μm or less. Setting it below the upper limit tends to further improve the processability when heat bending.

[0047] The hard coat layer is preferably obtained by applying a hard coat material that can be cured by heat or by active energy rays, and then curing it. Examples of coatings cured using active energy rays include resin compositions consisting of one or more monofunctional or polyfunctional (preferably 2 to 10-functional) (meth)acrylate monomers or oligomers, and preferably resin compositions containing monofunctional or polyfunctional (preferably 2 to 10-functional) urethane (meth)acrylate oligomers. It is preferable that a photopolymerization initiator be added to these resin compositions as a curing catalyst. Examples of thermosetting resin coatings include polyorganosiloxane-based and cross-linked acrylic-based coatings. Some of these resin compositions are commercially available as hard coat agents for acrylic resin or polycarbonate resin films or sheets, and should be selected appropriately considering their suitability for the painting line. For the hard coat layer, reference can be given to paragraphs 0045 to 0055 of Japanese Patent Publication No. 2013-020130, paragraphs 0073 to 0076 of Japanese Patent Publication No. 2018-103518, and paragraphs 0062 to 0082 of Japanese Patent Publication No. 2017-213771, and these contents are incorporated herein by reference.

[0048] The multilayer body of this embodiment may have other layers besides those described above. Specifically, examples include adhesive layers, tack layers, antifouling layers, and so on.

[0049] Furthermore, the multilayer body may have at least one of the following treatments applied to at least one of its surfaces: anti-fingerprint treatment, anti-glare treatment, weather-resistant treatment, antistatic treatment, anti-fouling treatment, and anti-blocking treatment. An example of the outermost surface of the multilayer body in this case is a hard coat layer. Anti-blocking treatment refers to a treatment that allows films to be easily separated even if they are in close contact with each other, and examples include adding an anti-blocking agent or creating irregularities on the surface of the multilayer body. The multilayer body of this embodiment can be formed by using a main extruder for extruding the resin composition of this embodiment and a sub-extruder for extruding the acrylic resin layer forming composition, melting the resin under the conditions of the resin used in each, guiding it to an extrusion die, and laminating it inside the die to form a sheet, or by laminating it after forming it into a sheet.

[0050] <Molded articles and methods for manufacturing molded articles> Next, a molded article using the multilayer body of this embodiment and a method for manufacturing the molded article will be described. The molded product of this embodiment is a molded product formed from the multilayer body of this embodiment. The multilayer body of this embodiment also has excellent heat bending resistance, making it suitable for applications involving bent sections. For example, it is preferably used in molded products having sections with a radius of curvature of 50 mmR or less (preferably 40 to 50 mmR). The molded article of this embodiment can be obtained, for example, by thermo-bending the multilayer body of this embodiment at 105 to 117°C. The multilayer body of this embodiment has excellent heat bending resistance, making it particularly useful when the molded article has a portion with a radius of curvature of 50 mmR or less. However, from the viewpoint of preventing springback and cracking, it is even more preferable to thermo-bend at 110°C or higher, and 115°C or lower.

[0051] <Application> The flat molded body, multilayer body, and molded product of this embodiment can be suitably used for optical components, decorative products, anti-reflective molded bodies, and the like. The flat molded bodies, multilayer bodies, and molded articles of this embodiment are suitably used in components for display devices, electrical and electronic equipment, office automation equipment, portable information terminals, machine parts, home appliances, vehicle parts, various containers, lighting equipment, and the like. Among these, they are particularly suitable for use in housings for various displays, electrical and electronic equipment, office automation equipment, portable information terminals, and home appliances, lighting equipment and vehicle parts (especially vehicle interior parts), surface films for smartphones and touch panels, optical materials, and optical discs. In particular, the molded bodies of this embodiment are suitably used as sensor films for touch panels and anti-reflective molded bodies for various displays. The multilayer body of this embodiment also has excellent heat bending resistance, making it suitable for applications involving bent sections. For example, it is preferably used in multilayer bodies and molded articles having portions with a radius of curvature of 50 mmR or less (preferably 40 to 50 mmR). [Examples]

[0052] The present invention will be described in more detail below with reference to examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate, as long as they do not depart 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 other reasons, measurements can be taken using other instruments with equivalent performance.

[0053] 1.Raw materials <Polycarbonate resin> T-1380: Bisphenol A type polycarbonate resin using hexadecyl parahydroxybenzoate as a terminal encapsulant, manufactured by Mitsubishi Gas Chemical Company, Inc., weight-average molecular weight: 55,000, Tg: 124℃ E-2000: Bisphenol A type polycarbonate resin with pt-butylphenyl group terminals, manufactured by Mitsubishi Engineering Plastics Corporation, E-2000F, weight-average molecular weight: 53,000, Tg: 149℃

[0054] <Phosphate esters> PX-200: Resorcinol poly(di-2,6-xylyl) phosphate, manufactured by Daihachi Chemical Industry Co., Ltd. CR-741: Bisphenol A bis-diphenyl phosphate, manufactured by Daihachi Chemical Industry Co., Ltd.

[0055] <Phosphite ester (for comparison)> HP-10: Manufactured by ADEKA Corporation S-9228PC: Manufactured by DOVER Chemical Corporation

[0056] <Release agent> S-100A: Glycerin monostearate, manufactured by Riken Vitamin Co., Ltd., Rikemar S-100A

[0057] <Acrylic resin layer> HT121: Manufactured by Arkema Corporation, acrylic resin (PMMA), ALTUGLAS® HT121. Tg: 115℃, weight-average molecular weight: 75,800. TN001: Manufactured by Mitsubishi Chemical Corporation, acrylic resin (PMMA), TN001 Tg: 118℃, weight-average molecular weight: 82,600 hw55: Manufactured by Daicel Evonik Corporation, acrylic resin (styrene:maleic anhydride:MMA mass ratio = 15%:9%:76%), PLEXIGLAS hw55, Tg: 120℃, weight-average molecular weight: 109,000 PM120N: Manufactured by Asahi Kasei Chemicals Corporation, acrylic resin (styrene:N-phenylmaleimide:MMA mass ratio = 4%:15%:81%), Delpet PM120N, Tg: 124℃, weight-average molecular weight: 121,000

[0058] 2. Examples 1-7, Comparative Examples 1-7 <Manufacturing of polycarbonate resin pellets (resin composition)> Each component listed in Tables 1-4 was weighed to the amount indicated in Tables 1-4 (the amount added is shown in parts by mass in Tables 1-4). After mixing in a tumbler for 15 minutes, the mixture was melt-kneaded at a cylinder temperature of 280°C using a twin-screw extruder with a screw diameter of 32 mm and a vent (TEX30α, manufactured by Japan Steel Works, Ltd.), and polycarbonate resin pellets (resin composition) were obtained by strand cutting.

[0059] <Manufacturing of polycarbonate resin film (flat molded product)> Using the obtained polycarbonate resin pellets (Examples 1-7, Comparative Examples 1-7), polycarbonate resin films were manufactured by the following method. The polycarbonate resin pellets obtained above were extruded in a molten state using a T-die melt extruder consisting of a twin-screw extruder with a barrel diameter of 32 mm and a screw L / D ratio of 31.5 (manufactured by Japan Steel Works, "TEX30α"), at a discharge rate of 10 kg / h and a screw rotation speed of 63 rpm. The extruded pellets were passed between the first and second rolls, and without compression between the first and second rolls, they were cooled and solidified only on the second roll to produce a polycarbonate resin film. The cylinder and die head temperature was 280°C. The final film thickness was adjusted to 100 μm by changing the roll speed of the second roll.

[0060] The details of the second roll used are as follows: • Second roll: JSW Co., Ltd., rigid metal roll (surface: hard chrome treated) Core diameter: Outer diameter 250mm x Width 600mm Roll temperature: 130℃

[0061] <Measurement of glass transition temperature (TIG)> The glass transition temperature (TIG) of various resins and resin compositions was determined by performing two cycles of heating and cooling under the differential scanning calorimetry (DSC) conditions described below, and the glass transition temperature (°C) during the heating phase of the second cycle was measured. When the intersection of a line extending the baseline on the low-temperature side towards the high-temperature side and the tangent to the inflection point is defined as the starting glass transition temperature, and the intersection of a line extending the baseline on the high-temperature side towards the low-temperature side and the tangent to the inflection point is defined as the ending glass transition temperature, and the midpoint between the starting and ending glass transition temperatures is defined as the intermediate glass transition temperature, in this invention the starting glass transition temperature is adopted as the glass transition temperature (TIG). The measurement start temperature was 30°C, the heating rate was 10°C / min, the target temperature was 250°C, and the cooling rate was 20°C / min. The measuring device used was a differential scanning calorimeter (DSC, manufactured by Hitachi High-Tech Science Corporation, model "DSC7020").

[0062] <Film Moisture Heat Test> A 50mm x 50mm piece of polycarbonate resin film was cut from near the center of the polycarbonate resin film obtained above. Next, the polycarbonate resin film piece was placed in an environmental testing chamber set to a temperature of 85°C and a relative humidity (RH) of 85%, and held in that state for 200 hours. Furthermore, the holder containing the film was moved to an environmental testing chamber set to a temperature of 23°C and a relative humidity of 50%, and held in that state for 4 hours.

[0063] <Haze Measurement> Using a haze meter, the haze (%) of the polycarbonate resin film (before the moist heat test) obtained above was measured under the condition of a D65 light source and a 10° field of view. Furthermore, the haze of the polycarbonate resin film after the above-mentioned moist heat test was measured in the same manner. A haze meter, model "HM-150" manufactured by Murakami Color Technology Research Institute, was used.

[0064] <Method for measuring weight-average molecular weight> The weight-average molecular weight (Mw) of the polycarbonate resin film (before the moist heat test) and the polycarbonate resin film after the moist heat test were measured by gel permeation chromatography. Specifically, an LC-20AD system (Shimadzu Corporation) gel permeation chromatography apparatus was used, connected to an LF-804 column (Shodex Corporation). The column temperature was set to 40°C. A RID-10A (Shimadzu Corporation) radioisotope detector was used. Chloroform was used as the eluent, and a calibration curve was created using standard polystyrene (Tosoh Corporation). If the above-mentioned gel permeation chromatography apparatus, column, and detector are difficult to obtain, measurements can be taken using other equipment with equivalent performance.

[0065] <Manufacturing of multilayer structures (multilayer sheets) of polycarbonate resin sheets and acrylic resin layers> Multilayer bodies were molded using a multilayer extrusion apparatus that included a 32mm diameter single-screw extruder, a 65mm diameter single-screw extruder, a feed block connected to all extruders, a multilayer extruder with a 650mm wide T-die connected to the feed block, and a multi-manifold die connected to each extruder. Acrylic resin layer-forming pellets shown in Tables 1-4 were introduced into the 32mm diameter single-screw extruder and extruded at a cylinder temperature of 250°C and a discharge rate of 3.6 kg / h. Similarly, resin compositions (polycarbonate resin pellets) shown in Tables 1-4 were continuously introduced into the 65mm diameter single-screw extruder and extruded at a cylinder temperature of 280°C and a discharge rate of 32.4 kg / h. The feed block connected to all extruders was equipped with two types of two-layer distribution pins and, at a temperature of 270°C, was used to introduce and laminate acrylic resin layer-forming pellets and polycarbonate resin pellets shown in Tables 1-4. The material was extruded into a sheet using a T-die connected to the end at a temperature of 270°C, and then cooled while transferring a mirror finish using three mirror-finishing rolls at temperatures of 130°C, 140°C, and 180°C from the upstream side, thereby obtaining a multilayer body of acrylic resin layer and polycarbonate resin sheet. The overall thickness of the central part of the obtained multilayer body was 1000 μm, and the thickness of the acrylic resin layer was 100 μm.

[0066] <Flow Mark Appearance> The presence or absence of flow marks was visually inspected during the molding of a multilayer structure consisting of a polycarbonate resin sheet and an acrylic resin layer. The evaluation was conducted by five experts, and the decision was made by majority vote.

[0067] <Foreign object> In the extrusion conditions described above for the production of multilayer polycarbonate resin sheets and acrylic resin layers (multilayer sheets), the multilayer obtained after 2 hours of continuous operation was visually inspected and evaluated by counting the number of gel-like foreign matter defects. Gel-like foreign matter defects are high molecular weight components of the transparent resin composition that disrupt the interfacial layers of the multilayer and are counted as defects. The evaluation was conducted by five experts and decided by majority vote. A: 2m 2 Within that area, the average number of defects is less than 3. B: 2m 2 Within that area, the average number of defects is 3 or more.

[0068] <Hard coat layer application> A coating was prepared by adding 1% by mass of a photopolymerization initiator (product name: I-184 [compound name: 1-hydroxycyclohexylphenyl ketone] manufactured by BASF Corporation) to a total of 100 parts by mass of a mixture of 60 parts by mass of a hexafunctional urethane acrylate oligomer (product name: U6HA, manufactured by Shin Nakamura Chemical Industry Co., Ltd.), 35 parts by mass of PEG200# diacrylate (product name: 4EG-A, manufactured by Kyoeisha Chemical Co., Ltd.), and 5 parts by mass of an oligomer containing fluorine-containing groups, hydrophilic groups, lipophilic groups, and UV-reactive groups (product name: RS-90, manufactured by DIC Corporation). This coating was then applied to the surface of the multilayer acrylic resin layer prepared above using a bar coater, and a metal halide lamp (20 mW / cm²) was used. 2 The hard coat was cured by applying (a solution) for 5 seconds. The thickness of the formed hard coat layer was 6 μm.

[0069] <Heat press formability> Using the multilayer body with a hard coat layer obtained above, a convex (male) mold and a concave (female) mold with a radius of curvature of 50 mmR were fabricated. Before molding, the body was preheated at 90°C for 1 minute, placed in the mold with the hard coat layer side facing convex, pressed at a mold temperature of 115°C for 3 minutes, and then allowed to cool naturally to produce a hot-press molded body.

[0070] <<Cracks in the bent section>> The cracks in the bent portions of the above-mentioned hot-pressed molded body were visually inspected. The cracks in the bent portions were evaluated according to the following criteria. The evaluation was conducted by five experts, and the decision was made by majority vote. A: No cracks are visible in the bent portion of the hot-pressed molded body. B: Cracks are visible in the bent portion of the hot-pressed molded body.

[0071] <<Springback>> The above hot-pressed molded body was placed along a 50mmR cylinder, and its springback was evaluated according to the following criteria. The evaluation was conducted by five experts, and the decision was made by majority vote. A: It conforms to the cylinder. (No springback) B: Does not conform to the cylinder. (Springback occurs)

[0072] <Moist heat test after hot press molding> The multilayer material, after hot-press molding, was placed in an environmental testing machine set to a temperature of 85°C and a relative humidity of 85%, and maintained in these conditions for 200 hours. The sheet's appearance was then evaluated as follows. The evaluation was conducted by five experts, and the decision was made by majority vote. A: No change in appearance B: Some kind of change was observed, for example, the sheet turned white, or it did not retain the shape of the heat-pressed product.

[0073] [Table 1]

[0074] [Table 2]

[0075] [Table 3]

[0076] [Table 4] [Explanation of symbols]

[0077] 1 Multilayer body 2. Flat molded body (polycarbonate resin film or sheet) 3. Acrylic resin layer 4. Hard court layer

Claims

1. A multilayer body having a flat molded body and a layer containing acrylic resin, The flat molded body is formed from a resin composition comprising 70 to 99 parts by mass of an aromatic polycarbonate resin having an end structure represented by formula (1), 1 to 12 parts by mass of a phosphate ester, and 0 to 29 parts by mass of another thermoplastic resin other than the aromatic polycarbonate resin having an end structure represented by formula (1). The other thermoplastic resin includes an aromatic polycarbonate resin having an end structure represented by formula (2), A multilayer body in which the glass transition temperature of the layer containing the acrylic resin is 113°C or higher. 【Chemistry 1】 (In formula (1), R １ R represents an alkyl group having 8 to 36 carbon atoms, or an alkenyl group having 8 to 30 carbon atoms. ２ Each of these independently represents a halogen atom, an alkyl group with 1 to 20 carbon atoms, or an aryl group with 6 to 12 carbon atoms. n represents an integer from 0 to 4. * indicates a bonding site with another part. 【Chemistry 2】 (In formula (2), R ２ Each of these independently represents a halogen atom, a C1-C20 alkyl group, or a C6-C12 aryl group. t-Bu represents a t-butyl group. n represents an integer from 0 to 4. * indicates a bonding site with another part.

2. The multilayer according to claim 1, wherein the glass transition temperature of the resin composition, as determined by differential scanning calorimetry, is 120°C or less.

3. The multilayer according to claim 1 or 2, wherein the glass transition temperature of the resin composition, as determined by differential scanning calorimetry, is 100°C or higher.

4. The multilayer according to any one of claims 1 to 3, wherein the phosphate ester comprises an aromatic ring.

5. The multilayer according to any one of claims 1 to 4, wherein the resin composition is molded into a flat plate-shaped molded body with a thickness of 100 μm, and the haze after treatment at 85°C and 85% relative humidity for 200 hours is 20% or less.

6. The multilayer according to any one of claims 1 to 5, wherein when the resin composition is treated at 85°C and 85% relative humidity for 200 hours, the difference in weight-average molecular weight (Mw) before and after treatment is 10,000 or less.

7. The multilayer body according to any one of claims 1 to 6, wherein the thickness of the flat molded body is 10 to 5,000 μm.

8. The multilayer according to any one of claims 1 to 7, wherein the total thickness of the multilayer is 10 to 10,000 μm.

9. Furthermore, the multilayer body according to any one of claims 1 to 8, wherein the multilayer body further comprises a hard coat layer, the hard coat layer being laminated in the order of a flat molded body, a layer containing acrylic resin, and the hard coat layer.

10. A molded article formed from a multilayer body according to any one of claims 1 to 9, wherein the molded article has a portion with a radius of curvature of 50 mmR or less.

11. A method for manufacturing a molded article, comprising thermoforming a multilayer body according to any one of claims 1 to 9 at 105 to 117°C.

12. The method for manufacturing a molded article according to claim 11, wherein the molded article has a portion with a radius of curvature of 50 mmR or less.

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