Polycarbonate resin composition

Abstract

A polycarbonate resin composition according to one embodiment of the present invention comprises: 100 parts by mass of a polycarbonate resin; the photodiffusion composition contains 0.01 parts by mass to 5 parts by mass (inclusive) of an acrylic photodiffusion material, 0.005 parts by mass to 2 parts by mass (inclusive) of a phosphorus-based antioxidant, 0.005 parts by mass to 2 parts by mass (inclusive) of a phenolic antioxidant, and 0.001 parts by mass to 5 parts by mass (inclusive) of an alicyclic epoxy compound.

Description

Technical Field

[0001] This invention relates to polycarbonate resin compositions. Background Technology

[0002] Patent Document 1 discloses a light-diffusing aromatic polycarbonate resin composition, characterized in that it comprises, relative to 100 parts by weight of (A) aromatic polycarbonate resin (component A), 0.05 to 2.0 parts by weight of (B) polymeric microparticles (component B) and 0.0001 to 0.5 parts by weight of (C) heat stabilizer (component C), wherein the refractive index of the polymeric microparticles (component B) is in the range of 1.495 to 1.504. The light-diffusing aromatic polycarbonate resin composition described in Patent Document 1 possesses both the impact resistance inherent in polycarbonate resin and appropriate light diffusivity.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-57925 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] Acrylic light-diffusing materials are sometimes used as light-diffusing materials added to polycarbonate resin compositions due to their excellent optical properties (e.g., light diffusivity, transmittance). However, because acrylic light-diffusing materials have lower heat resistance than polycarbonate resins, they are prone to thermal decomposition during the mixing and molding of the resin composition, producing volatile organic compounds (VOCs) such as methyl methacrylate. Since VOCs are harmful to human health, it is desirable to minimize the amount of VOCs generated from the resin composition. However, for the light-diffusing aromatic polycarbonate resin composition in Patent Document 1, the generation of VOCs was not investigated.

[0008] One aspect of this invention aims to provide novel polycarbonate resin compositions with lower VOC emissions.

[0009] means for solving problems

[0010] To address the aforementioned problems, the inventors conducted in-depth research and, for the first time, discovered that by combining a phosphorus-based antioxidant, a phenolic antioxidant, and an alicyclic epoxy compound in a polycarbonate resin composition containing an acrylic light-diffusing material in predetermined proportions, a polycarbonate resin composition with lower VOC emissions can be obtained, thus completing the present invention. Specifically, in one embodiment of the present invention, the polycarbonate resin composition comprises, relative to 100 parts by weight of polycarbonate resin, 0.01 parts by weight and 5 parts by weight of an acrylic light-diffusing material, 0.005 parts by weight and 2 parts by weight of a phosphorus-based antioxidant, 0.005 parts by weight and 2 parts by weight of a phenolic antioxidant, and 0.001 parts by weight and 5 parts by weight of an alicyclic epoxy compound.

[0011] The effects of the invention

[0012] According to one aspect of the present invention, a novel polycarbonate resin composition with lower VOC emissions can be provided. Attached Figure Description

[0013] Figure 1 This is a perspective view showing the appearance of the molded body produced in the embodiment. Detailed Implementation

[0014] The following is a detailed description of one aspect of the present invention. It should be noted that, unless otherwise specified, in this specification, "A to B" indicating a numerical range means "A or more and B or less". Furthermore, acrylates or methacrylates are referred to as (meth)acrylates. Similarly, acrylic acid or methacrylic acid are referred to as (meth)acrylic acid.

[0015] <1. Polycarbonate resin composition>

[0016] [summary]

[0017] In one aspect of the polycarbonate resin composition (hereinafter sometimes simply referred to as "resin composition"), relative to 100 parts by weight of polycarbonate resin, it comprises 0.01 parts by weight and 5 parts by weight of an acrylic light-diffusing material, 0.005 parts by weight and 2 parts by weight of a phosphorus-based antioxidant, 0.005 parts by weight and 2 parts by weight of a phenolic antioxidant, and 0.001 parts by weight and 5 parts by weight of an alicyclic epoxy compound. One aspect of the resin composition according to the present invention includes: a compound prepared by mixing raw materials containing the above-mentioned components, and a compound obtained by melt-kneading the compound.

[0018] One aspect of the present invention relates to a resin composition that contains the aforementioned amounts of phosphorus-based antioxidants, phenolic antioxidants, and alicyclic epoxy compounds, thereby becoming a polycarbonate resin composition with lower VOC emissions.

[0019] Such resin compositions can be suitably used as materials for all items, such as automotive interior components where VOC levels are strictly limited. This effect also contributes to achieving, for example, the United Nations Sustainable Development Goals (SDGs) Goal 3, "Ensuring healthy lifestyles and promoting the well-being of people of all ages," and Goal 12, "Ensuring sustainable consumption and production patterns."

[0020] Based on the results of experiments involving the addition of phosphorus-based and phenolic antioxidants to polycarbonate resins as shown in the examples described later, the inventors hypothesized the mechanism of action of these antioxidants in reducing VOC generation as follows: It is believed that phosphorus-based antioxidants prevent the generation of free radicals in polycarbonate (PC), while phenolic antioxidants capture free radicals generated by PC. Thus, it is hypothesized that phosphorus-based and phenolic antioxidants, through their respective mechanisms of action, prevent free radicals generated by PC from acting on acrylic light-diffusing materials, resulting in a reduction in VOC generation from methyl methacrylate (MMA) and other components derived from acrylic light-diffusing materials.

[0021] On the other hand, although the mechanism of action of alicyclic epoxides in reducing VOC generation is unclear, it is believed that the VOC generation is further reduced by using alicyclic epoxides in conjunction with phosphorus-based and phenolic antioxidants. Therefore, it is thought that alicyclic epoxides help reduce VOC generation due to their different mechanism of action compared with phosphorus-based and phenolic antioxidants.

[0022] [Uses of the resin composition]

[0023] One aspect of the present invention relates to a resin composition that exhibits excellent optical properties (e.g., light transmittance) and generates less VOCs. The application of this resin composition is not particularly limited, and it can be suitably used as a material for light-diffusing components by effectively utilizing the aforementioned advantages. For example, the VOC generation of automotive interior components is strictly limited. Therefore, the resin composition of this invention can be particularly suitable as a material for light-diffusing components for automotive interiors, for example. Examples of light-diffusing components include light-transmitting components requiring good light transmittance, such as lighting covers. Therefore, the resin composition of this invention can be used as a polycarbonate resin composition for light diffusion. Furthermore, the resin composition of this invention can be suitably used as a composition for applications such as lighting covers.

[0024] [Polycarbonate resin]

[0025] Polycarbonate resin is not particularly limited in type as long as it is a resin containing a polymer with carbonate bonds (-O-CO-O-) in the main chain. Polycarbonate resin can be, for example, aromatic polycarbonate resin or aliphatic polycarbonate resin. Aromatic polycarbonate resin is a polycarbonate resin containing aromatic rings such as benzene rings between the carbonate bonds in the main chain, while aliphatic polycarbonate resin is a polycarbonate resin that does not contain aromatic rings such as benzene rings between the carbonate bonds in the main chain. Furthermore, polycarbonate resin can have a branched structure. A single polycarbonate resin can be used, or two or more resins can be used in any proportion.

[0026] Polycarbonate resins can be polycarbonate resins manufactured by known methods. For example, polycarbonate resins manufactured by reacting diphenols with carbonate precursors via solution method (interfacial polycondensation) or melt method (transesterification) can be used, i.e., polycarbonate resins manufactured by interfacial polycondensation of diphenols with carbonyl chloride in the presence of a capping agent, or polycarbonate resins manufactured by reacting diphenols with diphenyl carbonate in the presence of a capping agent via transesterification or the like.

[0027] The diphenols, carbonate precursors, and capping agents that can be used to manufacture polycarbonate resins can be substances commonly used in this art. For example, the diphenols, carbonate precursors, and capping agents disclosed in International Publication No. 2018 / 181949 can be used to manufacture polycarbonate resins.

[0028] In one aspect of the present invention, the viscosity-average molecular weight (Mv) of the polycarbonate resin is not limited, but from the viewpoint of flowability, it is preferably 10,000 or more, 30,000 or less, more preferably 11,000 or more, and 26,000 or less. In particular, when the polycarbonate resin composition according to one aspect of the present invention is used in a light diffusion component (e.g., an illumination cover), the Mv of the polycarbonate resin is preferably 12,000 or more, 25,000 or less, more preferably 13,000 or more, and 23,000 or less.

[0029] In this specification, viscosity-average molecular weight (Mv) refers to the molecular weight calculated by using an Ubbelohde viscometer to measure the viscosity of a dichloromethane solution at 20°C, determining the intrinsic viscosity [η], and then applying the following formula.

[0030] [η] = 1.23 × 10⁻⁵ Mv 0.83

[0031] (Preferred types of polycarbonate resins)

[0032] The polycarbonate resin preferably comprises an aromatic polycarbonate resin having repeating units in the main chain as shown in the following general formula (I).

[0033] [Chemical Formula 1]

[0034]

[0035] (In the above formula (I),

[0036] R A1 and R A2 R is an alkyl or alkoxy group having 1 or more carbon atoms and 6 or fewer carbon atoms. A1 With R A2 They can be the same or different;

[0037] X represents a single bond, an alkyl group with 1 or more carbon atoms but less than 8 carbon atoms, an alkylidene group with 2 or more carbon atoms but less than 8 carbon atoms, a cycloalkyl group with 5 or more carbon atoms but less than 15 carbon atoms, a cycloalkylidene group with 5 or more carbon atoms but less than 15 carbon atoms, -S-, -SO-, -SO2-, -O-, or -CO-.

[0038] a and b each independently represent integers greater than 0 and less than 4;

[0039] When a is 2 or higher, R A1 They can be the same or different. When b is 2 or more, R A2 They can be the same or different.

[0040] As R A1 and R A2 The alkyl groups shown can be, for example, methyl, ethyl, n-propyl, isopropyl, various butyl groups (“various” means including both straight-chain and all branched groups, the same below), various pentyl groups, and various hexyl groups. As R A1 and R A2 The alkoxy groups shown can be exemplified by, for example, alkoxy groups with an alkyl group in which the alkyl group is exemplified above. R A1 and R A2 Preferably, they are alkyl groups having 1 or more carbon atoms and 4 or fewer carbon atoms, or alkoxy groups having 1 or more carbon atoms and 4 or fewer carbon atoms.

[0041] Examples of alkyl groups represented by X include methylene, ethylene, trimethylene, tetramethylene, and hexamethylene, with a preference for alkyl groups having 1 or more and 5 or fewer carbon atoms. Examples of alkylidene groups represented by X include ethoxyl and isopropylidene. Examples of cycloalkylene groups represented by X include cyclopentanediyl, cyclohexanediyl, and cyclooctanediyl, with a preference for cycloalkylene groups having 5 or more and 10 or fewer carbon atoms. Examples of cycloalkylidene groups represented by X include cyclohexyl, 3,5,5-trimethylcyclohexyl, and 2-adamantaneide, with a preference for cycloalkylidene groups having 5 or more and 10 or fewer carbon atoms, and more preferably cycloalkylidene groups having 5 or more and 8 or fewer carbon atoms.

[0042] a and b each independently represent an integer greater than 0 and less than 4, preferably an integer greater than 0 and less than 2, and more preferably 0 or 1.

[0043] Aromatic polycarbonate resins having repeating units as shown in the above general formula (I) as the main chain include, for example, aromatic polycarbonate resins having a bisphenol A structure (in the above general formula (I), X is isopropylidene).

[0044] As a specific example of an aromatic polycarbonate resin having a bisphenol A structure, TARFLON can be cited. TM (Made by FORMOSA IDEMITSU PETROCHEMICAL CORP.) etc.

[0045] In one aspect of the present invention, from the viewpoint of transparency, mechanical properties, thermal properties, etc. of the obtained molded article, the aromatic polycarbonate resin preferably includes an aromatic polycarbonate resin having a bisphenol A structure.

[0046] There is no limitation on the content of aromatic polycarbonate resin having a bisphenol A structure in the aromatic polycarbonate resin, but it is preferably 50% by mass or more and 100% by mass or less, more preferably 75% by mass or more and 100% by mass or less, and even more preferably 85% by mass or more and 100% by mass or less, because the desired effects brought about by including aromatic polycarbonate resin having a bisphenol A structure can be fully obtained.

[0047] Acrylic light diffusing materials

[0048] Acrylic-based light-diffusing materials are not particularly limited to any polymer microparticles containing structural units derived from acrylic monomers. Examples of acrylic monomers include: methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, and ethylene glycol dimethacrylate. Methyl methacrylate is particularly preferred. These acrylic monomers can be one or more.

[0049] Acrylic light-diffusing materials can contain structural units derived from monomers other than acrylic monomers.

[0050] Acrylic light-diffusing materials can have cross-linked structures. Acrylic light-diffusing materials can be used alone or in combination of two or more in any proportion.

[0051] Acrylic-based light-diffusing materials may include at least one selected from poly(meth)acrylic acid particles and cross-linked poly(meth)acrylic acid particles. Well-known acrylic-based light-diffusing materials may be suitably used, such as polymethyl methacrylate (PMMA) particles (product name "Ganzpearl GM-0449S-2", manufactured by Agk Industries, Ltd.), cross-linked poly(meth)acrylic acid particles (product name "MBX-5", manufactured by Sekisui Chemicals, Ltd.), cross-linked poly(meth)acrylic acid particles (product name "MBX-2H", manufactured by Sekisui Chemicals, Ltd.), and cross-linked poly(meth)acrylic acid particles (product name "BMSA-18GN", manufactured by Sekisui Chemicals, Ltd.).

[0052] Acrylic light-diffusing materials are preferably composed of structural units derived from (meth)acrylic acid monomers, comprising 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, 95% or more, 97% or more, 99% or more, 99.5% or more, or substantially 100% by mass.

[0053] (Particle size and refractive index of acrylic light-diffusing materials)

[0054] There is no particular limitation on the particle size of the polymeric microparticles contained in acrylic light-diffusing materials. Polymeric microparticles with particle sizes in the range commonly used as light-diffusing materials can be used. For example, polymeric microparticles with particle sizes in the range of 0.1 μm and below 10 μm can be used.

[0055] Furthermore, from the viewpoint of balancing light diffusivity and light transmittance, an acrylic light diffusing material having a refractive index difference (i.e., refractive index difference) of 0.13 or less with that of polycarbonate resin is preferred, and this refractive index difference is more preferably 0.11 or less. Additionally, from the viewpoint of balancing light diffusivity and light transmittance, an acrylic light diffusing material having a refractive index difference of 0.08 or more with that of polycarbonate resin can also be used.

[0056] (Content of acrylic light-diffusing material)

[0057] In one embodiment of the present invention, the resin composition comprises 0.01 parts by weight and 5 parts by weight of an acrylic light-diffusing material relative to 100 parts by weight of polycarbonate resin. By ensuring the content of the acrylic light-diffusing material in the resin composition is within the aforementioned range, a sufficient light diffusion effect can be obtained.

[0058] From the viewpoint of balancing light diffusivity and light transmittance, the content of acrylic light-diffusing material in the resin composition according to one embodiment of the present invention is preferably 0.1 parts by weight or more, more preferably 0.5 parts by weight or more, relative to 100 parts by weight of polycarbonate resin. Furthermore, from the same viewpoint, the content of acrylic light-diffusing material in the resin composition according to one embodiment of the present invention is preferably 2.5 parts by weight or less, more preferably 2.0 parts by weight or less, relative to 100 parts by weight of polycarbonate resin. From the viewpoint of balancing light diffusivity and light transmittance, the content of acrylic light diffusing material in the resin composition of one embodiment of the present invention, relative to 100 parts by weight of polycarbonate resin, can be 0.6 parts by weight or more, 0.7 parts by weight or more, 0.8 parts by weight or more, 0.9 parts by weight or more, 1.0 parts by weight or more, 1.1 parts by weight or more, 1.2 parts by weight or more, 1.3 parts by weight or more, 1.4 parts by weight or more, 1.5 parts by weight or more, or less than 1.5 parts by weight, less than 1.4 parts by weight, less than 1.3 parts by weight, less than 1.2 parts by weight, less than 1.1 parts by weight, or less than 1.0 parts by weight.

[0059] [Phosphorus-based antioxidants]

[0060] There are no particular limitations on the types of phosphorus-based antioxidants; appropriate selections can be made from well-known phosphorus-based antioxidants. Examples of phosphorus-based antioxidants include phosphite compounds and phosphine compounds. A single phosphorus-based antioxidant can be used, or two or more can be used in any proportion.

[0061] (phosphite compounds)

[0062] Examples of phosphite compounds include pentaerythritol diphosphite compounds and aryl phosphite compounds.

[0063] (Pentaerythritol diphosphite compound)

[0064] As a pentaerythritol diphosphite compound, there is no particular limitation; for example, compounds represented by the following general formula (1) can be cited.

[0065]

Chemical Formula 2

[0066]

[0067] In equation (1), R C11 ~R C16 for

[0068] (i) Hydrogen atoms, or aromatic ring groups having 6 or more but fewer than 15 carbon atoms, may be the same or different; or are...

[0069] (ii) The hydrogen atoms or the alkyl group having 1 or more carbon atoms but less than 12 may be the same or different.

[0070] Among them, R C11 ~R C16 Not all of them are hydrogen atoms.

[0071] In equation (1) R C11 ~R C16 When it is (i) above, the aromatic ring group having 6 or more carbon atoms and 15 or fewer can be exemplified by phenyl, tolyl, xylyl, naphthyl, biphenyl, benzyl, phenethyl, phenylpropyl, cumyl, etc. These groups may further have substituents such as hydroxyl, amino, etc.

[0072] Additionally, R in equation (1) C11 ~R C16 When it is (ii) above, examples of alkyl groups having 1 or more carbon atoms and 12 or fewer include methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, various hexyl, various octyl, various nonyl, various decyl, various undecyl, and various dodecyl.

[0073] Specific examples of the compounds shown in formula (1) above include bis(2,4-dicumylphenyl)pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite.

[0074] (Preferred example of the compound shown in formula (1))

[0075] In the above equation (1), R C11 ~R C16 When it is as described in (i) above, the number of carbon atoms in the aromatic ring group is preferably 6 or more and 13 or less, more preferably 6 or more and 10 or less. Examples of aromatic rings include benzene rings, naphthalene rings, phenanthrene rings, anthracene rings, etc., with benzene rings being preferred.

[0076] Among them, the aromatic ring group with 6 or more carbon atoms and 15 or less is preferably the group shown in the following general formula (1a).

[0077]

Chemical Formula 3

[0078]

[0079] In equation (1a), R C17 R C18 It can be alkyl or alkenyl, and can be the same or different. Or, R C17 With R C18 They can bond together to form a ring. R C17 R C18Preferably, it is an alkyl group having 1 or more but 5 or fewer carbon atoms, or an alkenyl group having 2 or more but 5 or fewer carbon atoms; more preferably, it is an alkyl group having 1 or more but 3 or fewer carbon atoms; and even more preferably, it is a methyl group.

[0080] In equation (1a), R C19 It is a hydrogen atom or an alkyl group, preferably a hydrogen atom or an alkyl group having 1 or more but less than 5 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 or more but less than 3 carbon atoms, and even more preferably a hydrogen atom. m is an integer of 0 or more but less than 5. When m is 2 or more, multiple R C19 They can be the same or different.

[0081] In equation (1a), Z represents a single bond or a carbon atom. When Z is a single bond, R C17 R C18 Excluded from general formula (1a).

[0082] When the compound shown in formula (1) above has two or more groups shown in general formula (1a), the multiple groups may be the same or different from each other.

[0083] For the compound shown in formula (1) above, in formula (1), it is preferred that R C11 and R C14 For hydrogen atoms, R C12 ~R C13 R C15 ~R C16 It is an aromatic ring group with 6 or more carbon atoms and 15 or fewer carbon atoms, more preferably R C11 and R C14 For hydrogen atoms, R C12 ~R C13 R C15 ~R C16 The group is represented by the general formula (1a) above.

[0084] That is, the compound represented by the above formula (1) is preferably a pentaerythritol diphosphite compound represented by the following general formula (1-1).

[0085] [Chemical Formula 4]

[0086]

[0087] In the formula, R C17a ~R C17d R C18a ~R C18d It can be alkyl or alkenyl, and can be the same or different. Or, R C17a With R C18a R C17b With R C18b R C17c With R C18c RC17d With R C18d They can bond together to form a ring.

[0088] R C19a ~R C19d It can be a hydrogen atom or an alkyl group, and they can be the same or different.

[0089] m1 to m4 are integers greater than 0 and less than 5, and they can be the same or different. When m1 to m4 are greater than 2, multiple R... C19a R C19b R C19c R C19d They can be the same or different.

[0090] Z 1 ~Z 4 Representing a single bond or a carbon atom, which can be the same or different. In Z... 1 ~Z 4 When representing a single bond, R C17a ~R C17d R C18a ~R C18d Excluded from general formula (1-1).

[0091] In general formula (1-1), R C17a ~R C17d R C18a ~R C18d Preferably, it is an alkyl group having 1 or more but 5 or fewer carbon atoms, or an alkenyl group having 2 or more but 5 or fewer carbon atoms; more preferably, it is an alkyl group having 1 or more but 3 or fewer carbon atoms; and even more preferably, it is a methyl group. R is even more preferred. C17a ~R C17d and R C18a ~R C18d All are methyl groups.

[0092] R C19a ~R C19d Preferably, it is a hydrogen atom or an alkyl group having 1 or more but less than 5 carbon atoms; more preferably, it is a hydrogen atom or an alkyl group having 1 or more but less than 3 carbon atoms; even more preferably, it is a hydrogen atom; and even more preferably, it is R. C19a ~R C19d All are hydrogen atoms.

[0093] m1 to m4 are preferably integers greater than or equal to 0 and less than 3, more preferably integers greater than or equal to 0 and less than 1, and even more preferably 0. 1 ~Z 4 Preferably, it contains carbon atoms.

[0094] Among the pentaerythritol diphosphite compounds represented by the general formula (1-1) above, bis(2,4-dicumylphenyl)pentaerythritol diphosphite represented by the formula (1-2) below is particularly suitable. Bis(2,4-dicumylphenyl)pentaerythritol diphosphite is available as a commercially available product, for example, "Doverphos S-9228PC" manufactured by Dover Chemical.

[0095] [Chemical Formula 5]

[0096]

[0097] Furthermore, in the above equation (1) R C11 ~R C16 When it is (ii) above, in equation (1), R C11 ~R C16 All are preferably alkyl groups having 1 or more but less than 12 carbon atoms. R C11 ~R C16 More preferably, it is selected from one or more of methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, various hexyl and various octyl, and even more preferably, it is selected from one or more of methyl, ethyl, isopropyl and tert-butyl.

[0098] Among them, R is more preferably the compound represented by the above formula (1). C11 R C13 R C14 and R C16 For tert-butyl, R C12 and R C15 The compound is a methyl compound. That is, the compound shown in formula (1) above is preferably bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite shown in formulas (1-3) below. Bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite is available as a commercially available product, for example, "ADEKA STAB PEP-36" manufactured by ADEKA Co., Ltd.

[0099]

Chemical Formula 6

[0100]

[0101] (Aromatic phosphite compounds)

[0102] There are no particular limitations on the aryl phosphite compounds. For example, compounds represented by the following general formula (2) can be cited.

[0103] [Chemical Formula 7]

[0104]

[0105] In equation (2), R C21 ~R C25 It can be a hydrogen atom, an alkyl group having 1 or more but less than 12 carbon atoms, or an aryl group having 6 or more but less than 14 carbon atoms; these can be the same or different. Among these, from the perspective of its effect as an antioxidant, R... C21 ~R C25 Not all are hydrogen atoms, R C21 ~R C25 At least two of them are alkyl groups having 1 or more carbon atoms and 12 or fewer carbon atoms, or aryl groups having 6 or more carbon atoms and 14 or fewer carbon atoms.

[0106] Specific examples of compounds represented by formula (2) above include tris(2,4-di-tert-butylphenyl) phosphite, etc.

[0107] (Preferred example of the compound shown in formula (2))

[0108] In equation (2) above, it is preferred that R C21 ~R C25 Compounds in which any two of the atoms are alkyl groups having 1 or more carbon atoms and 12 or fewer, or aryl groups having 6 or more carbon atoms and 14 or fewer, and the remainder are hydrogen atoms, are in R C21 ~R C25 Among compounds in which any two atoms are alkyl groups having 1 or more carbon atoms and 12 or fewer, or aryl groups having 6 or more carbon atoms and 14 or fewer, and the remainder are hydrogen atoms, R is more preferably preferred. C21 or R C25 At least one of them is an alkyl group having 1 or more carbon atoms and less than 12 carbon atoms, or an aryl group having 6 or more carbon atoms and less than 14 carbon atoms.

[0109] Examples of alkyl groups having 1 or more but less than 12 carbon atoms include methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, various hexyl, various octyl, various decyl, and various dodecyl. Preferably, the alkyl group is selected from one or more of methyl, ethyl, n-propyl, isopropyl, various butyl, various pentyl, various hexyl, and various octyl groups; more preferably, it is selected from one or more of methyl, ethyl, isopropyl, and tert-butyl groups; and even more preferably, it is tert-butyl.

[0110] Examples of aryl groups with 6 or more carbon atoms but less than 14 include phenyl, tolyl, and xylyl.

[0111] Among them, R C21 ~R C25 More preferably, it is a hydrogen atom or an alkyl group having 1 or more but less than 12 carbon atoms; even more preferably, it is a hydrogen atom, methyl, ethyl, isopropyl, or tert-butyl; and even more preferably, it is a hydrogen atom or tert-butyl. A particularly preferred compound is R. C21 and R C23 For tert-butyl, R C22R C24 and R C25 Compounds containing hydrogen atoms, such as tris(2,4-di-tert-butylphenyl) phosphite as shown in formula (2-1) below. Tris(2,4-di-tert-butylphenyl) phosphite is available as a commercially available product, for example, BASF's "IRGAFOS168".

[0112] [Chemical Formula 8]

[0113]

[0114] (Examples other than the compounds shown in formula (2))

[0115] Other examples of aryl phosphite compounds include compounds represented by general formula (3) and general formula (4).

[0116] [Chemical Formula 9]

[0117]

[0118] The compound shown in formula (3) above is 2,2'-methylenebis(4,6-di-tert-butylphenyl)2-ethylhexyl phosphite. 2,2'-methylenebis(4,6-di-tert-butylphenyl)2-ethylhexyl phosphite is available as a commercially available product, for example, "ADEKA STAB HP-10" manufactured by ADEKA Co., Ltd.

[0119] The compound shown in formula (4) above is 2-tert-butyl-6-methyl-4-{3-[2,4,8,10-tetratert-butyldibenzo[d,f][1,3,2]dioxaphosphanecyclohepten-6-yl)oxy]propyl}phenol. 2-tert-butyl-6-methyl-4-{3-[2,4,8,10-tetratert-butyldibenzo[d,f][1,3,2]dioxaphosphanecyclohepten-6-yl)oxy]propyl}phenol is available as a commercially available product, for example, Sumitomo Chemical Co., Ltd.'s "Sumilizer GP".

[0120] (phosphine compounds)

[0121] Examples of phosphine compounds include arylphosphine compounds.

[0122] As an arylphosphine compound, it is acceptable to be any phosphine compound having one or more aryl groups, for example, the compound shown in the following general formula (5) can be cited.

[0123] P-(R D21 )3 (5)

[0124] In equation (5) above, R D21It is a hydrocarbon group that can have substituents, with at least one being an aryl group having 6 or more carbon atoms and fewer than 18 carbon atoms. Multiple R groups D21 They can be the same or different.

[0125] Examples of compounds represented by the general formula (5) above include: triphenylphosphine, diphenylbutylphosphine, diphenyloctadecylphosphine, tris(p-tolyl)phosphine, tris(p-nonylphenyl)phosphine, tris(naphthyl)phosphine, diphenyl(hydroxymethyl)phosphine, diphenyl(acetoxymethyl)phosphine, diphenyl(β-ethylcarboxyethyl)phosphine, tris(p-chlorophenyl)phosphine, tris(p-fluorophenyl)phosphine, diphenylbenzylphosphine, diphenyl-β-cyanoethylphosphine, diphenyl(p-hydroxyphenyl)phosphine, diphenyl-1,4-dihydroxyphenyl-2-phosphine, phenylnaphthylbenzylphosphine, etc.

[0126] (Preferred example of the compound shown in formula (5))

[0127] Preferably, R is the one in the above general formula (5). D21 All are aryl compounds, more preferably triphenylphosphine. Triphenylphosphine is available as a commercially available product, for example, "JC-263" manufactured by Johoku Chemical Industry Co., Ltd.

[0128] (Preferred types of phosphorus-based antioxidants)

[0129] The phosphorus-based antioxidant is preferably selected from one or more phosphite compounds and phosphine compounds, and more preferably contains at least one phosphite compound. The phosphorus-based antioxidant preferably contains one or more compounds selected from the compounds shown in general formula (1), general formula (2), and general formula (3), more preferably containing one or more compounds selected from the pentaerythritol diphosphite compound shown in general formula (1-1) and the compound shown in general formula (2), and even more preferably containing one or more compounds selected from the pentaerythritol diphosphite compound shown in general formula (1-1) and the tris(2,4-di-tert-butylphenyl) phosphite shown in general formula (2-1). Furthermore, the phosphorus-based antioxidant more preferably includes one or more selected from tris(2,4-di-tert-butylphenyl) phosphite; bis(2,4-dicumylphenyl) pentaerythritol diphosphite; bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite; and 2,2'-methylenebis(4,6-di-tert-butylphenyl) 2-ethylhexyl phosphite.

[0130] (Content of phosphorus-based antioxidants)

[0131] In one embodiment of the present invention, the resin composition contains 0.005 parts by weight and 2 parts by weight of a phosphorus-based antioxidant relative to 100 parts by weight of polycarbonate resin. By ensuring that the content of the phosphorus-based antioxidant in the resin composition is within the above-mentioned range, the effect of further reducing VOC generation can be sufficiently obtained.

[0132] In one embodiment of the present invention, the content of a phosphorus-based antioxidant in the resin composition is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and particularly preferably 0.2 parts by weight or more, relative to 100 parts by weight of polycarbonate resin. Furthermore, in another embodiment of the present invention, the content of a phosphorus-based antioxidant in the resin composition is preferably 1.0 parts by weight or less, more preferably 0.5 parts by weight or less, relative to 100 parts by weight of polycarbonate resin.

[0133] [Phenolic antioxidants]

[0134] There are no particular limitations on the types of phenolic antioxidants; appropriate selections can be made from known phenolic antioxidants. Preferably, one or more selected from hindered phenolic antioxidants, semi-hindered phenolic antioxidants, and less-hindered phenolic antioxidants are used. A single phenolic antioxidant can be used, or two or more can be used in any proportion.

[0135] Examples of hindered phenolic antioxidants include: octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (e.g., product name "Irganox1076", manufactured by BASF Japan Co., Ltd., or product name "ADEKA STAB AO-50", manufactured by ADEKA Co., Ltd.); and pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (e.g., product name "Irganox1010", manufactured by BASF Japan Co., Ltd., or product name "ADEKA STAB"). AO-60” (manufactured by ADEKA Co., Ltd.); N,N'-hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide] (e.g., product name "Irganox1098", manufactured by BASF Japan Co., Ltd.); 2,2-thiodiethylidenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (e.g., product name "Irganox1035", manufactured by BASF Japan Co., Ltd.); etc.

[0136] Examples of semi-hindered phenolic antioxidants include 3,9-bis[2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane (e.g., product name "Sumilizer GA-80", manufactured by Sumitomo Chemical Co., Ltd., or product name "ADEKA STAB AO-80", manufactured by ADEKA Co., Ltd.).

[0137] Examples of low-hindered phenolic antioxidants include 4,4',4''-(1-methylpropyl-3-ylidene)tris(6-tert-butyl-m-cresol) (e.g., product name "ADEKA STAB AO-30", manufactured by ADEKA Corporation); 6,6'-di-tert-butyl-4,4'-butylidene di-m-cresol (e.g., product name "ADEKA STAB AO-40", manufactured by ADEKA Corporation); and so on.

[0138] (Preferred types of phenolic antioxidants)

[0139] Phenolic antioxidants preferably include hindered phenolic antioxidants. Examples of hindered phenolic antioxidants are as described above, and they preferably include one or more selected from octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0140] (Content of phenolic antioxidants)

[0141] In one embodiment of the present invention, the resin composition comprises 0.005 parts by weight and 2 parts by weight of a phenolic antioxidant relative to 100 parts by weight of polycarbonate resin. By ensuring that the content of the phenolic antioxidant in the resin composition is within the above-mentioned range, the effect of further reducing VOC generation can be sufficiently achieved.

[0142] In one embodiment of the present invention, the content of the phenolic antioxidant in the resin composition is preferably 0.01 parts by weight or more, more preferably 0.05 parts by weight or more, and particularly preferably 0.1 parts by weight or more, relative to 100 parts by weight of polycarbonate resin. Furthermore, in another embodiment of the present invention, the content of the phenolic antioxidant in the resin composition is preferably 0.3 parts by weight or less, more preferably 0.2 parts by weight or less, relative to 100 parts by weight of polycarbonate resin.

[0143] [Alicyclic epoxides]

[0144] Alicyclic epoxides are cyclic aliphatic compounds that possess an alicyclic epoxy group, i.e., an epoxy group formed by adding one oxygen atom to an ethylene bond within an aliphatic ring. There are no particular limitations on the types of alicyclic epoxides; appropriate selection is permissible.

[0145] Examples of alicyclic epoxide compounds include (i) compounds having an alicyclic epoxy group within the molecule, and (ii) compounds having an epoxy group directly bonded to the alicyclic ring by a single bond. Here, "alicyclic epoxy group" refers to an epoxy group composed of two adjacent carbon atoms and an oxygen atom constituting the alicyclic ring. Examples of compounds having an alicyclic epoxy group within the molecule include compounds having a 1,2-epoxycyclopentyl group and compounds having a 1,2-epoxycyclohexyl group.

[0146] As an alicyclic epoxy compound, for example, the alicyclic epoxy compounds shown in the following formulas (B-1) to (B-10) are preferred.

[0147]

Chemical Formula 10

[0148]

[0149] (In the formula, R is H or CH3.)

[0150]

Chemical Formula 11

[0151]

[0152] (In the formula, R is H or CH3.)

[0153]

Chemical Formula 12

[0154]

[0155] (In the formula, a + b = 1 or 2.)

[0156]

Chemical Formula 13

[0157]

[0158] (In the formula, a + b + c + d = 1, 2, or 3.)

[0159]

Chemical Formula 14

[0160]

[0161] (In the formula, a + b + c = n (an integer), and R is a hydrocarbon group.)

[0162]

Chemical Formula 15

[0163]

[0164] (In the formula, n is an integer.)

[0165] [Chemical Formula 16]

[0166]

[0167] (In the formula, R is a hydrocarbon group.)

[0168]

Chemical Formula 17

[0169]

[0170] (In the formula, n is an integer, and R is a hydrocarbon group.)

[0171] It should be noted that the alicyclic epoxy compounds shown in formulas (B-1) to (B-6) and (B-8) above are examples of the aforementioned "compounds having a 1,2-epoxycyclohexyl group". Furthermore, the alicyclic epoxy compounds shown in formulas (B-7), (B-9), and (B-10) above are examples of the aforementioned "compounds in which an epoxy group is directly bonded to the alicyclic ring by a single bond".

[0172] Alicyclic epoxy compounds can be used alone or in combination of two or more in any proportion.

[0173] (Preferred types of alicyclic epoxy compounds)

[0174] From the perspective of excellent compatibility with polycarbonate resin and no loss of transparency, the alicyclic epoxy compound is preferably selected from one or more compounds shown in formula (B-1) and formula (B-10), and more preferably the compound shown in formula (B-1).

[0175] For example, the compound shown in formula (B-1) is 3,4'-epoxycyclohexanecarboxylic acid 3',4'-epoxycyclohexylmethyl ester, which is sold under the product name "CELLOXIDE 2021P" (manufactured by Daicel Co., Ltd.).

[0176] In addition, as a compound represented by formula (B-10), for example, a 1,2-epoxy-4-(2-epoxyethyl)cyclohexane adduct of 2,2-bis(hydroxymethyl)-1-butanol can be cited, which is sold under the product name "EHPE3150" (manufactured by Daicel Co., Ltd.).

[0177] Alternatively, as a mixture of CELLOXIDE 2021P and EHPE3150, the product name "EHPE3150CE" sold by Daicel Co., Ltd. can also be preferred.

[0178] Therefore, alicyclic epoxy compounds preferably contain 3',4'-epoxycyclohexanecarboxylic acid methyl ester.

[0179] In addition to the alicyclic epoxy compounds exemplified above, bis-7-oxabicyclo[4.1.0]heptane may also be preferred. bis-7-oxabicyclo[4.1.0]heptane is sold under the product name "CELLOXIDE 8010" (manufactured by Daicel Co., Ltd.).

[0180] (Content of alicyclic epoxy compounds)

[0181] In one embodiment of the present invention, the resin composition comprises 0.001 parts by weight and 5 parts by weight of an alicyclic epoxy compound relative to 100 parts by weight of polycarbonate resin. By ensuring that the content of the alicyclic epoxy compound in the resin composition is within the aforementioned range, a further reduction in VOC emissions can be achieved.

[0182] In one embodiment of the present invention, the content of the alicyclic epoxy compound in the resin composition is preferably 0.005 parts by weight or more, more preferably 0.01 parts by weight or more, further preferably 0.02 parts by weight or more, and even more preferably 0.03 parts by weight or more, relative to 100 parts by weight of polycarbonate resin. Furthermore, in another embodiment of the present invention, the content of the alicyclic epoxy compound in the resin composition is preferably 0.2 parts by weight or less, more preferably less than 0.1 parts by weight, more preferably 0.09 parts by weight or less, and even more preferably 0.05 parts by weight or less, relative to 100 parts by weight of polycarbonate resin.

[0183] [Other ingredients]

[0184] In one embodiment of the resin composition of the present invention, in addition to the above-mentioned components, optional additives such as ultraviolet absorbers and release agents may be mixed in within a range that does not impair the effects of the present invention. Common additives typically used in this art can be used.

[0185] For example, when adding a UV absorber, the amount of UV absorber added to the resin composition according to one embodiment of the present invention can be set to 0.001 parts by mass and 3 parts by mass or less relative to 100 parts by mass of polycarbonate resin. By setting the content of the UV absorber in the resin composition within the above range, sufficient weather resistance can be imparted to the resin composition.

[0186] For example, when adding a release agent, the amount of release agent added to the resin composition according to one embodiment of the present invention can be set to 0.001 parts by mass and 3 parts by mass or less relative to 100 parts by mass of polycarbonate resin. By having the content of the release agent in the resin composition within the above range, the release performance can be improved, and mold adhesion can be significantly reduced even under continuous molding conditions.

[0187] [Method for manufacturing polycarbonate resin composition]

[0188] The method for manufacturing the resin composition according to one aspect of the present invention is not particularly limited and can be carried out by known methods. For example, it can be manufactured by mixing the above-mentioned components at room temperature (e.g., 20°C to 30°C) and then performing melt blending. Melt blending can be performed by methods commonly used in the art, such as using a single-screw extruder, a twin-screw extruder, a co-kneader, or a multi-screw extruder. The heating temperature during melt blending is typically selected appropriately within the range of 220°C to 300°C.

[0189] <2. Molded body>

[0190] Molded articles incorporating the polycarbonate resin composition according to one aspect of the present invention are also included within the scope of the present invention. The polycarbonate resin composition according to one aspect of the present invention in a molded article has already been described and will not be repeated here.

[0191] [Manufacturing Method of Molded Objects]

[0192] One aspect of the present invention relates to a molded article that can be manufactured by a manufacturing method comprising a molding step of molding the polycarbonate resin composition of one aspect of the present invention. In the molding step, the method of molding the polycarbonate resin composition of one aspect of the present invention is not particularly limited. For example, a melt-blended compound of the polycarbonate resin composition of one aspect of the present invention or granules obtained by melt-blending can be used as raw material, and the article can be manufactured by known molding methods such as injection molding, injection compression molding, extrusion molding, blow molding, stamping, vacuum forming, and foaming molding. It is particularly preferred to use the obtained granules to manufacture the molded article by injection molding or injection compression molding. The molding temperature in the molding step is not particularly limited and can be appropriately set; for example, molding can be performed at a temperature of 240°C or higher and 300°C or lower.

[0193] [Applications of molded objects]

[0194] One aspect of the present invention relates to a molded body with excellent optical properties (e.g., light transmittance) and generates less VOCs. The application of the molded body according to one aspect of the present invention is not particularly limited, and it can be suitably used as a light-diffusing component by effectively utilizing the aforementioned advantages. For example, the VOC generation of components for automotive interiors is strictly limited. Therefore, the molded body according to one aspect of the present invention can be particularly suitable for use as a light-diffusing component for automotive interiors, for example. Therefore, the molded body according to one aspect of the present invention can be used as a light-diffusing component for automotive interiors. Examples of light-diffusing components include illumination covers and other components requiring good light transmittance. Therefore, the molded body according to one aspect of the present invention can be suitably used as an illumination cover. Therefore, the molded body according to one aspect of the present invention is an illumination cover.

[0195] [Summarize]

[0196] The polycarbonate resin composition according to embodiment 1 of the present invention comprises, relative to 100 parts by weight of polycarbonate resin, 0.01 parts by weight or more and 5 parts by weight of an acrylic light-diffusing material, 0.005 parts by weight or more and 2 parts by weight of a phosphorus-based antioxidant, 0.005 parts by weight or more and 2 parts by weight of a phenolic antioxidant, and 0.001 parts by weight or more and 5 parts by weight of an alicyclic epoxy compound.

[0197] The polycarbonate resin composition according to embodiment 2 of the present invention preferably comprises, in embodiment 1 above, 0.005 parts by mass and 0.2 parts by mass of the above-mentioned alicyclic epoxy compound relative to 100 parts by mass of the above-mentioned polycarbonate resin.

[0198] The polycarbonate resin composition involved in Scheme 3 of the present invention is preferably, in Scheme 1 or 2 above, the alicyclic epoxy compound comprises at least one selected from 3',4'-epoxycyclohexanecarboxylic acid methyl ester and bi-7-oxabicyclo[4.1.0]heptane.

[0199] The polycarbonate resin composition according to embodiment 4 of the present invention is preferably an aromatic polycarbonate resin in any of the embodiments 1 to 3 described above, wherein the polycarbonate resin comprises an aromatic polycarbonate resin having repeating units of the following general formula (I) in the main chain.

[0200] [Chemical Formula 18]

[0201]

[0202] (In the above formula (I),

[0203] R A1 and R A2 R is an alkyl or alkoxy group having 1 or more carbon atoms and 6 or fewer carbon atoms.A1 With R A2 They can be the same or different;

[0204] X represents a single bond, an alkyl group with 1 or more carbon atoms but less than 8 carbon atoms, an alkylidene group with 2 or more carbon atoms but less than 8 carbon atoms, a cycloalkyl group with 5 or more carbon atoms but less than 15 carbon atoms, a cycloalkylidene group with 5 or more carbon atoms but less than 15 carbon atoms, -S-, -SO-, -SO2-, -O-, or -CO-.

[0205] a and b each independently represent integers greater than 0 and less than 4;

[0206] When a is 2 or higher, R A1 They can be the same or different. When b is 2 or more, R A2 They can be the same or different.

[0207] Preferably, in any one of the above-described embodiments 1 to 4, the polycarbonate resin composition of embodiment 5 of the present invention has a viscosity-average molecular weight of 10,000 or more and 30,000 or less.

[0208] Preferably, in any of the above-described embodiments 1 to 5, the polycarbonate resin composition of embodiment 6 of the present invention comprises at least one selected from poly(meth)acrylic acid particles and crosslinked (meth)acrylic acid particles.

[0209] Preferably, in any one of the above-described embodiments 1 to 6, the refractive index difference between the polycarbonate resin and the acrylic light-diffusing material is 0.11 or less in the polycarbonate resin composition of embodiment 7 of the present invention.

[0210] Preferably, in any of the above-described embodiments 1 to 7, the polycarbonate resin composition of embodiment 8 of the present invention contains a phosphite compound as the phosphorus-based antioxidant.

[0211] Preferably, in any of the embodiments 1 to 8 described above, the polycarbonate resin composition of embodiment 9 of the present invention comprises at least one selected from tris(2,4-di-tert-butylphenyl) phosphite; bis(2,4-dicumylphenyl) pentaerythritol diphosphite; bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite; and 2,2'-methylenebis(4,6-di-tert-butylphenyl) 2-ethylhexyl phosphite.

[0212] Preferably, in any one of the above-described embodiments 1 to 9, the polycarbonate resin composition of embodiment 10 of the present invention contains one or more of the following: hindered phenolic antioxidants, semi-hindered phenolic antioxidants, and low-hindered phenolic antioxidants.

[0213] Preferably, in any of the above-described embodiments 1 to 10, the polycarbonate resin composition of embodiment 11 of the present invention contains a hindered phenolic antioxidant.

[0214] The polycarbonate resin composition involved in embodiment 12 of the present invention is preferably a polycarbonate resin composition for light diffusion in any of the embodiments 1 to 11 described above.

[0215] The molded body according to embodiment 13 of the present invention comprises a polycarbonate resin composition described in any one of embodiments 1 to 12 above.

[0216] The molded body involved in Scheme 14 of the present invention can be: the above-mentioned Scheme 13 is a lighting cover.

[0217] The molded body involved in Scheme 15 of the present invention can be: Scheme 13 above is a light diffusion component for automotive interior.

[0218] This invention is not limited to the embodiments described above. Various modifications can be made within the scope of the claims of this invention. Embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of this invention.

[0219] Example

[0220] The present invention will be further described in detail below with reference to embodiments and comparative examples, but the present invention is not limited to these embodiments.

[0221] <Raw materials for polycarbonate resin compositions>

[0222] The raw materials for the polycarbonate resin compositions used in the examples and comparative examples are as follows.

[0223] (Polycarbonate resin)

[0224] Product name "TARFLON" TM FN1700 (made by FORMOSA IDEMITSU PETROCHEMICAL CORP., bisphenol A polycarbonate resin, viscosity-average molecular weight (Mv) = 17700, refractive index 1.585)

[0225] (Acrylic-based light-diffusing materials)

[0226] Product name "Ganzpearl GM-0449S-2" (manufactured by Ganzpearl Corporation, average particle size 4μm, refractive index 1.49, refractive index difference 0.095, polymethyl methacrylate (PMMA) particles)

[0227] (Phosphorus-based antioxidants)

[0228] The following two phosphorus-based antioxidants were used:

[0229] • Product name: “IRGAFOS168” (manufactured by BASF, tris(2,4-di-tert-butylphenyl) phosphite);

[0230] • Product name: "Doverphos S-9228PC" (manufactured by Dover Chemical, bis(2,4-dicumylphenyl)pentaerythritol diphosphite)

[0231] (Phenolic antioxidants)

[0232] Product name "Irganox1076" (manufactured by BASF Japan Co., Ltd., n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate)

[0233] (Alicyclic epoxides)

[0234] Product name "CELLOXIDE 2021P" (manufactured by Daicel Co., Ltd., 3,4-epoxycyclohexanecarboxylic acid 3',4'-epoxycyclohexylmethyl ester)

[0235] (Alicyclic epoxides)

[0236] Product name "CELLOXIDE 8010" (manufactured by Daicel Co., Ltd., bi-7-oxabicyclo[4.1.0]heptane)

[0237] (Other additives: UV absorbers)

[0238] Product name "KEMISORB79" (manufactured by CHEMIPRO KASEI Co., Ltd., 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole)

[0239] (Other additives: mold release agent)

[0240] Product name "EW-440A" (manufactured by Riken Vitamin Co., Ltd., pentaerythritol tetrastearate).

[0241] [Example 1]

[0242] The components were mixed according to the mixing ratios shown in Table 1 to obtain the polycarbonate resin composition of Example 1. The polycarbonate resin composition was melt-blended at a barrel temperature of 280°C using a twin-screw extruder with a vent (manufactured by Shibaura Machinery Co., Ltd., "TEM37SS") with a screw diameter of 37 mm and a vent, and granules were obtained by wire cutting. The obtained granules were dried at 120°C for 5 hours.

[0243] The dried granules were then used in an injection molding machine (NIIGATA MACHINE TECHNO. Ltd. "MD50XB") to form the granules using the injection molding method at a barrel temperature of 300°C, a mold temperature of 80°C, and a cycle time of 40 seconds. Figure 1 The three-section shaped test piece (molded body) is shown. Figure 1 This is a perspective view showing the appearance of the molded body produced in the embodiment. Figure 1 The dimensions of the molded body shown are as follows.

[0244] Thickness H1: 3mm, H2: 2mm, H3: 1mm

[0245] Lengths along the longer side: L1: 44mm, L2: 23mm, L3: 23mm

[0246] The length of the shorter side, W1, is 50 mm.

[0247] [Examples 2-6, Comparative Examples 1-5]

[0248] In addition to mixing the components according to the mixing ratios shown in Table 1 or Table 2, test tablets of Examples 2 to 6 and Comparative Examples 1 to 5 were prepared using the same method as in Example 1.

[0249] <VOC Measurement Test>

[0250] The VOC content generated by the test pieces of Examples 1-6 and Comparative Examples 1-5 was determined by the following method.

[0251] (Determination of total volatile organic compounds (TVOC))

[0252] The determination was performed by headspace gas chromatography according to VW standard PV3341. The determination conditions are as follows:

[0253] Headspace sampler: Agilent Technologies, 7697A

[0254] GC System: Agilent Technologies, 78909B

[0255] Column: DB-Heavy WAX (30m×0.25mm×0.25μm)

[0256] Oven temperature: 120℃

[0257] Bottle equilibration time: 5 hours

[0258] Inlet temperature: 200℃

[0259] Detector (FID) temperature: 260℃

[0260] The samples used in the TVOC determination were formed and then placed in a sealable aluminum (AL) bag, and stored at room temperature (20°C–25°C) until the determination. A 2g sample was used, cut from the thinner end of the formed article (three-segment shaped test piece).

[0261] <Results>

[0262] The results are shown in Tables 1 and 2.

[0263] Table 1

[0264]

[0265] Table 2

[0266]

[0267] Because phosphorus-based antioxidants are more effective than phenolic antioxidants in further reducing VOC emissions, they are considered to be the primary active agents in VOC reduction. However, the effect of further VOC reduction is small when using only one of the three components—phosphorus-based antioxidants, phenolic antioxidants, and alicyclic epoxy compounds—or only two of them in combination. This indicates a trend towards further VOC reduction through the combined use of these three components.

[0268] Based on the above results, it is revealed that, relative to 100 parts by weight of polycarbonate resin, the polycarbonate resin composition containing 0.01 parts by weight and 5 parts by weight of acrylic light-diffusing material, 0.005 parts by weight and 2 parts by weight of phosphorus-based antioxidant, 0.005 parts by weight and 2 parts by weight of phenolic antioxidant, and 0.001 parts by weight and 5 parts by weight of alicyclic epoxy compound generates less VOC.

[0269] Industrial availability

[0270] One aspect of the present invention relates to a polycarbonate resin composition that can be suitably used as a resin composition for light diffusion.

[0271] Symbol Explanation

[0272] Thicknesses of H1, H2, and H3

[0273] L1, L2, L3 Lengths along the longer side

[0274] W1 is the length of the shorter side.

Claims

1. A polycarbonate resin composition, wherein, Relative to 100 parts by weight of polycarbonate resin, it comprises: Acrylic light-diffusing materials, 0.01 parts by weight or more and 5 parts by weight or less; More than 0.005 parts by weight and less than 2 parts by weight of phosphorus-based antioxidants; 0.005 parts by weight or more and 2 parts by weight of phenolic antioxidants; and Alicyclic epoxy compounds, 0.001 parts by mass or more and 5 parts by mass or less.

2. The polycarbonate resin composition according to claim 1, wherein, The alicyclic epoxy compound comprises 0.005 parts by weight and less than 0.2 parts by weight relative to 100 parts by weight of the polycarbonate resin.

3. The polycarbonate resin composition according to claim 1 or 2, wherein, The alicyclic epoxy compound comprises at least one selected from 3',4'-epoxycyclohexylmethyl ester of 3,4-epoxycyclohexanecarboxylic acid and bi-7-oxabicyclo[4.1.0]heptane.

4. The polycarbonate resin composition according to any one of claims 1 to 3, wherein, The polycarbonate resin comprises an aromatic polycarbonate resin whose main chain has repeating units as shown in the following general formula (I). In the aforementioned formula (I), R A1 and R A2 R is an alkyl or alkoxy group having 1 or more carbon atoms and 6 or fewer carbon atoms. A1 With R A2 Choose either the same or different; X represents a single bond, an alkyl group with 1 or more carbon atoms but less than 8 carbon atoms, an alkylidene group with 2 or more carbon atoms but less than 8 carbon atoms, a cycloalkyl group with 5 or more carbon atoms but less than 15 carbon atoms, a cycloalkylidene group with 5 or more carbon atoms but less than 15 carbon atoms, -S-, -SO-, -SO2-, -O-, or -CO-. a and b each independently represent integers greater than 0 and less than 4; When a is 2 or more, R A1 Choose either the same or different, and if b is 2 or more, R A2 Choose either the same or different.

5. The polycarbonate resin composition according to any one of claims 1 to 4, wherein, The viscosity-average molecular weight of the polycarbonate resin is above 10,000 and below 30,000.

6. The polycarbonate resin composition according to any one of claims 1 to 5, wherein, The acrylic light-diffusing material comprises at least one selected from poly(meth)acrylic acid particles and cross-linked (meth)acrylic acid particles.

7. The polycarbonate resin composition according to any one of claims 1 to 6, wherein, The refractive index difference between the polycarbonate resin and the acrylic light-diffusing material is less than 0.

11.

8. The polycarbonate resin composition according to any one of claims 1 to 7, wherein, The phosphorus-based antioxidants include phosphite compounds.

9. The polycarbonate resin composition according to claim 8, wherein, The phosphorus-based antioxidant comprises at least one selected from tris(2,4-di-tert-butylphenyl) phosphite; bis(2,4-dicumylphenyl) pentaerythritol diphosphite; bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite; and 2,2'-methylenebis(4,6-di-tert-butylphenyl) 2-ethylhexyl phosphite.

10. The polycarbonate resin composition according to any one of claims 1 to 9, wherein, The phenolic antioxidant comprises one or more selected from hindered phenolic antioxidants, semi-hindered phenolic antioxidants, and low-hindered phenolic antioxidants.

11. The polycarbonate resin composition according to claim 10, wherein, The phenolic antioxidants include hindered phenolic antioxidants.

12. The polycarbonate resin composition according to any one of claims 1 to 11, wherein it is a polycarbonate resin composition for light diffusion.

13. A molded article comprising the polycarbonate resin composition according to any one of claims 1 to 12.

14. The molded body according to claim 13, wherein it is an illumination cover.

15. The molded article according to claim 13 is a light-diffusing component for automotive interiors.

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