Resin composition, pellet and molded article

Abstract

To provide a resin composition which is excellent in color development property and light resistance, while highly maintaining residence heat stability and moist heat resistance.SOLUTION: A resin composition contains (A) a polycarbonate resin containing specific constitutional units (a1) and (a2), (B) a block polymerization styrenic resin, and (C) a hindered amine-based photostabilizer. (A) The polycarbonate resin has a mass ratio ((a1) / (a2)) of the constitutional unit (a1) to the constitutional unit (a2) of 90 to 10 / 10 to 90, the content of (B) the block polymerization styrenic resin is 1 to 20 pts.mass with respect to 100 pts.mass of (A) the polycarbonate resin, the content of (C) the hindered amine-based photostabilizer is 0.01 to 1.00 pts.mass with respect to 100 pts.mass of (A) the polycarbonate resin, and the molecular weight of (C) the hindered amine-based photostabilizer is 1,000 or more.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a resin composition, pellets, and molded articles. More specifically, it relates to a polycarbonate resin composition, pellets, and molded articles.

Background Art

[0002] Polycarbonate resin is excellent in mechanical strength, electrical properties, transparency, etc., and is widely used as an engineering plastic in various fields such as the field of electric and electronic equipment and the automotive field. Also, many polymer alloys of polycarbonate resin and other thermoplastic resins have been developed.

[0003] For example, Patent Document 1 discloses a resin composition comprising 55 to 90% by mass of a polycarbonate resin and 45 to 10% by mass of a styrene resin in which the proportion of butadiene units is more than 0% by mass and 20% by mass or less, and for 100 parts by mass of the resin component, 0.1 to 2.0 parts by mass of an ultraviolet absorber and 0.1 to 2.0 parts by mass of a hindered amine light stabilizer containing a polyolefin structure, wherein the mass ratio of the ultraviolet absorber to the light stabilizer, ultraviolet absorber / light stabilizer, is 3.5 or less.

[0004] On the other hand, in recent years, for the purpose of reducing the cost of products, there are cases where it is used without painting, and it is required to color the resin itself to develop a desired color tone.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The resin composition described in Patent Document 1 is formulated by blending a polycarbonate resin, a styrene-based resin with a low proportion of butadiene units, an ultraviolet absorber, and a hindered amine light stabilizer containing a polyolefin structure in specific proportions, so as to maintain high retention stability and moisture and heat resistance while being excellent in light resistance. However, the color development property was not sufficient. Further improvement in light resistance was also required.

[0007] Under such circumstances, an object of the present invention is to provide a resin composition that maintains high retention heat stability and moisture and heat resistance while being excellent in color development property and light resistance. Another object of the present invention is to provide pellets made of the resin composition and molded articles formed from the pellets.

Means for Solving the Problems

[0008] As a result of intensive research to solve the above problems, the present inventor has found that the following invention meets the above object, and thus has arrived at the present invention. That is, the present invention relates to the following inventions.

[0009] <1> A resin composition comprising (A) a polycarbonate resin, (B) a bulk polymerized styrene-based resin, and (C) a hindered amine light stabilizer, wherein the (A) polycarbonate resin contains a structural unit (a1) represented by the following formula (1) and a structural unit (a2) represented by the following formula (2), and the mass ratio ((a1) / (a2)) of the structural unit (a1) to the structural unit (a2) is 90 to 10 / 10 to 90, the content of the (B) bulk polymerized styrene-based resin is 1 to 20 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin, the content of the (C) hindered amine light stabilizer is 0.01 to 1.00 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin, and the molecular weight of the (C) hindered amine light stabilizer is 1000 or more.

Chemical formula

Chemical formula

Chemical formula

Chemical formula

Chemical formula

Advantages of the Invention

[0010] According to the present invention, there is provided a resin composition that maintains high retention heat stability and moisture and heat resistance while being excellent in color development and light resistance. Further, pellets made of the resin composition and molded articles formed from the pellets are provided.

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail. However, the description of the constituent elements described below is an example (representative example) of an embodiment of the present invention, and the present invention is not limited to the following content unless the gist thereof is changed. In this specification, "~" is used to mean including the numerical values described before and after it as the lower limit value and the upper limit value. In this specification, various physical property values and characteristic values are those at 23°C unless otherwise specified. When the standards shown in this specification differ depending on the year and the measurement method, etc., they are based on the standards as of January 1, 2021 unless otherwise specified.

[0012] <Resin Composition> The present invention relates to a resin composition containing (A) a polycarbonate resin, (B) a bulk polymerized styrene resin, and (C) a hindered amine light stabilizer, wherein the (A) polycarbonate resin contains a structural unit (a1) represented by the following formula (1) and a structural unit (a2) represented by the following formula (2), and the mass ratio ((a1) / (a2)) of the structural unit (a1) to the structural unit (a2) is 90 to 10 / 10 to 90, the content of the (B) bulk polymerized styrene resin is 1 to 20 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin, the content of the (C) hindered amine light stabilizer is 0.01 to 1.00 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin, and the molecular weight of the (C) hindered amine light stabilizer is 1000 or more (hereinafter, may be referred to as "the resin composition of the present invention").

[0013]

Chemical formula

[0014] In formula (1), R 1 represents a methyl group, and R 2 represents a hydrogen atom or a methyl group, and X 1 represents a group represented by the following formula (1-a) or formula (1-b).

[0015]

Chemical formula

[0016] In formulae (1-a) and (1-b), R 3 and R 4 each independently represent a hydrogen atom or a methyl group, and Z 1 represents a group that combines with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms and optionally having a substituent.

[0017]

Chemical formula

[0018] In formula (2), X 2 represents a group represented by the following formula (2-a) or formula (2-b).

[0019]

Chemical formula

[0020] In formulae (2-a) and (2-b), R 5 and R 6 each independently represent a hydrogen atom or a methyl group, and Z 2 represents a group that combines with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms and optionally having a substituent.

[0021] By adopting such a configuration, a resin composition excellent in color development property and light resistance can be obtained while maintaining high retention heat stability and heat and humidity resistance.

[0022] In the resin composition of the present invention, as the (A) polycarbonate resin, one containing two specific structural units (structural units (a1) and (a2)) is used. By blending such an (A) polycarbonate resin and a (B) bulk polymerized styrene resin at a specific ratio, it is presumed that the resulting product has excellent color developability. Further, by using a high molecular weight (C) hindered amine light stabilizer, it is presumed that the light resistance can be improved and the properties that are contrary to the light resistance, such as the retention heat stability and the wet heat resistance, can be maintained at a high level.

[0023] Hereinafter, each component of the resin composition will be described in detail.

[0024] [(A) Polycarbonate resin] The resin composition of the present invention contains an (A) polycarbonate resin. This (A) polycarbonate resin contains a structural unit (a1) represented by the following formula (1) and a structural unit (a2) represented by the following formula (2). Note that the polycarbonate resin containing the structural unit (a1) and the structural unit (a2) includes both a mixture containing a polycarbonate resin containing the structural unit (a1) and a polycarbonate resin containing the structural unit (a2), and any form of a copolymer containing the structural unit (a1) and the structural unit (a2).

[0025] [(Structural unit (a1))] The structural unit (a1) is represented by the following formula (1).

[0026] [Chemical formula]

[0027] In formula (1), R 1 represents a methyl group, R 2 represents a hydrogen atom or a methyl group, and X 1 represents a group represented by the following formula (1-a) or formula (1-b).

[0028] [Chemical formula]

[0029] In formulas (1-a) and (1-b), R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z 1 represents a group that combines with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms and which may have a substituent.

[0030] In the structural unit represented by formula (1), R 2 is preferably a hydrogen atom.

[0031] In formula (1), when X 1 is the group represented by the above formula (1-a), R 3 and R 4 are preferably such that at least one of them is a methyl group, and more preferably both are methyl groups.

[0032] Also, in formula (1), when X 1 is the group represented by the above formula (1-b), Z 1 combines with the carbon C that binds to two benzene rings in the above formula (1) to form a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms. Examples of the divalent alicyclic hydrocarbon group include cycloalkylidene groups such as cyclohexylidene group, cycloheptylidene group, cyclododecylidene group, and adamantylidene group. Examples of the alicyclic hydrocarbon having a substituent formed by the combination of Z 1 with C include methyl-substituted products and ethyl-substituted products of the above alicyclic hydrocarbon groups. Among these, cyclohexylidene group, methyl-substituted products of cyclohexylidene group (preferably 3,3,5-trimethyl-substituted product), and cyclododecylidene group are preferred.

[0033] In formula (1), X 1 is preferably the group represented by the above formula (1-a).

[0034] Specific examples of the structural unit represented by the above formula (1) include structural units (carbonate structural units) composed of dihydroxy compounds such as 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C), 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 1,1-bis(3-methyl-4-hydroxyphenyl)cyclohexane, 1,1-bis(3,5-dimethyl-4-hydroxyphenyl)cyclohexane, etc. A structural unit composed of 2,2-bis(3-methyl-4-hydroxyphenyl)propane is preferred.

[0035] The structural unit (a1) may contain only one kind or two or more kinds of the structural units represented by the formula (1).

[0036] (Structural unit (a2)) The structural unit (a2) is represented by the following formula (2).

[0037] [Chemical formula]

[0038] In formula (2), X 2 represents a group represented by the following formula (2-a) or formula (2-b).

[0039] [Chemical formula]

[0040] In formulas (2-a) and (2-b), R 5 and R 6 each independently represent a hydrogen atom or a methyl group, and Z 2 represents a group that combines with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms, which may have a substituent.

[0041] In formula (2), when X 2 is the group represented by the above formula (2-a), R 5 and R 6It is preferable that at least one of them is a methyl group, and it is more preferable that both are methyl groups.

[0042] In formula (2), X 2 When it is a group represented by the above formula (2-b), Z 2 is bonded to the carbon C that binds to the two benzene rings in the above formula (2) to form a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms. Examples of the divalent alicyclic hydrocarbon group include cycloalkylidene groups such as cyclohexylidene group, cycloheptylidene group, cyclododecylidene group, and adamantylidene group. 2 Examples of the alicyclic hydrocarbon having a substituent formed by bonding Z

[0043] to C include methyl-substituted products and ethyl-substituted products of the above alicyclic hydrocarbon groups. Among these, a cyclohexylidene group, a methyl-substituted product of a cyclohexylidene group (preferably a 3,3,5-trimethyl-substituted product), and a cyclododecylidene group are preferable. 2 In formula (2), X

[0044] is preferably a group represented by the above formula (2-a).

[0045] The structural unit (a2) may contain only one kind or two or more kinds of the structural units represented by formula (2).

[0046] X in formula (1) 1 and X in formula (2) 2 are preferably the same group.

[0047] (A) The polycarbonate resin may contain other structural units in addition to the structural unit (a1) represented by the formula (1) and the structural unit (a2) represented by the formula (2). Examples of the other structural units include 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 2,2-bis(4-hydroxy-3-(1-methylethyl)phenyl)propane, 2,2-bis(4-hydroxy-3-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3-(1-methylpropyl)phenyl)propane, 2,2-bis(4-hydroxy-3-cyclohexylphenyl)propane, 2,2-bis(4-hydroxy-3-phenylphenyl)propane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)phenylmethane, 1,1-bis(4-hydroxy-3-(1-methylethyl)phenyl)cyclohexane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)cyclohexane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-phenylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-methylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-(1-methylethyl)phenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-phenylphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 4,4'-(1,3-phenylenediisopropylidene)bisphenol, 4,4'-(1,4-phenylenediisopropylidene)bisphenol, 9,Constituent units derived from dihydroxy compounds such as 9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 4,4'-dihydroxybenzophenone, 4,4'-dihydroxyphenyl ether, 4,4'-dihydroxybiphenyl, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, and 1,1-bis(4-hydroxy-6-methyl-3-tert-butylphenyl)butane are exemplified.

[0048] Further, as one embodiment of other constituent units, the constituent unit represented by formula (2) described in paragraph 0008 of International Publication No. 2017 / 099226, the descriptions in paragraphs 0043 to 0052 of International Publication No. 2017 / 099226, and the description in JP-A-2011-046769 can be referred to, and these contents are incorporated herein.

[0049] (A) In the polycarbonate resin, the mass ratio ((a1) / (a2)) of the constituent unit (a1) to the constituent unit (a2) is 90 to 10 / 10 to 90. By setting such a mass ratio, it is possible to improve the colorability while maintaining the heat resistance of the obtained molded product. In order to further improve the balance between heat resistance and colorability, (a1) / (a2) is preferably 75 to 13 / 25 to 87, more preferably 60 to 16 / 40 to 84, and even more preferably 40 to 20 / 60 to 80.

[0050] (A) In the polycarbonate resin, the total of the constituent unit (a1) and the constituent unit (a2) preferably occupies 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more of all the constituent units excluding the end groups. The upper limit of the total is 100% by mass or less.

[0051] (A) Examples of the polycarbonate resin include the following forms. (I) A mixture (blend) of a polycarbonate resin containing the constituent unit (a1) and a polycarbonate resin containing the constituent unit (a2) (II) Polycarbonate resin (copolymer) containing structural units (a1) and structural units (a2) (III) Mixture of a polycarbonate resin containing structural units (a1) and a polycarbonate resin containing structural units (a1) and structural units (a2) (IV) Mixture of a polycarbonate resin containing structural units (a2) and a polycarbonate resin containing structural units (a1) and structural units (a2) (V) Mixture of a polycarbonate resin containing structural units (a1), a polycarbonate resin containing structural units (a2), and a polycarbonate resin containing structural units (a1) and structural units (a2) (VI) In the above (I) to (V), the polycarbonate resin or mixture constituting the polycarbonate resin or mixture contains a polycarbonate resin or mixture containing other structural units in addition to structural units (a1) and structural units (a2) (VII) Mixture of the polycarbonate resin or mixture of (I) to (VI) above and a polycarbonate resin composed of other structural units

[0052] (A) The viscosity average molecular weight (Mv) of the polycarbonate resin preferably has a lower limit value of 5,000 or more, more preferably 8,000 or more, still more preferably 10,000 or more, and even more preferably 12,000 or more. Also, the upper limit value of Mv is preferably 32,000 or less, more preferably 30,000 or less, still more preferably 29,000 or less, and even more preferably 27,000 or less. By setting the viscosity average molecular weight to be not less than the above lower limit value, the moldability is improved, and a molded product with high mechanical strength can be obtained. Also, by setting it to be not more than the above upper limit value, the fluidity of the resin composition is improved, and thin-walled molded products and the like can be efficiently manufactured.

[0053] The viscosity average molecular weight (Mv) of the polycarbonate resin is determined by using methylene chloride as a solvent, obtaining the limiting viscosity (η) (unit: dL / g) at a temperature of 20 °C using an Ubbelohde viscometer, and calculating from the following Schnell viscosity formula. η = 1.23×10-4 Mv 0.83 In addition, when the (A) polycarbonate resin contains two or more polycarbonate resins, the sum of the values obtained by multiplying the viscosity average molecular weight of each polycarbonate resin by the mass fraction is used.

[0054] Further, when the (A) polycarbonate resin contains a polycarbonate resin containing the structural unit (a1), the viscosity average molecular weight of the polycarbonate resin containing the structural unit (a1) is preferably 15,000 to 30,000, and more preferably 18,000 to 28,000. When the (A) polycarbonate resin contains a polycarbonate resin containing the structural unit (a2), the viscosity average molecular weight of the polycarbonate resin containing the structural unit (a2) is preferably 12,000 to 35,000, and more preferably 15,000 to 30,000.

[0055] Further, the melt volume rate (MVR) of the (A) polycarbonate resin at 300 °C and a load of 1.2 kg is preferably 10.0 to 50.0 cm 3 / 10 min, more preferably 15.0 to 40.0 cm 3 / 10 min, and even more preferably 17.0 to 30.0 cm 3 / 10 min. MVR is measured according to the description of the examples described below. When the (A) polycarbonate resin contains two or more polycarbonate resins, the sum of the values obtained by multiplying the melt volume rate of each polycarbonate resin by the mass fraction is used.

[0056] (A) The production method of the polycarbonate resin is not particularly limited. For example, the descriptions in paragraphs 0027 to 0043 and the examples of JP-A-2014-065901 can be referred to, and these contents are incorporated herein.

[0057] In the resin composition of the present invention, the content of (A) polycarbonate resin is preferably 80% by mass or more, more preferably 82% by mass or more, still more preferably 84% by mass or more, even more preferably 86% by mass or more, and yet even more preferably 88% by mass or more in 100% by mass of the resin composition. By setting the content to be not less than the lower limit value, the heat resistance of the obtained molded product tends to be further improved. Also, the content of (A) polycarbonate resin in the resin composition of the present embodiment is preferably 99% by mass or less, more preferably 98% by mass or less, and may be 97% by mass or less in 100% by mass of the resin composition.

[0058] [(B) Bulk-polymerized styrene resin] The resin composition of the present invention contains 1 to 20 parts by mass of (B) bulk-polymerized styrene resin with respect to 100 parts by mass of (A) polycarbonate resin.

[0059] (B) Bulk-polymerized styrene resin is a bulk polymer produced by the bulk polymerization method. In the emulsion polymer produced by the emulsion polymerization method, impurities derived from the emulsifier and salting-out agent are mixed, while the bulk polymer does not contain impurities derived from the emulsifier and salting-out. Therefore, by using the bulk polymer, it can be made excellent in light resistance. Also, by blending (B) bulk-polymerized styrene resin, impact resistance can be imparted to the molded product formed from the polycarbonate resin.

[0060] (B) Bulk-polymerized styrene resin is not particularly limited as long as it contains styrene units and is produced by the bulk polymerization method. Examples of the monomer constituting the styrene units include styrene and its derivatives. Specifically, styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, methoxystyrene, monobromostyrene, dibromostyrene, fluorostyrene, tribromostyrene, etc. are mentioned, and styrene is particularly preferred.

[0061] (B) The bulk polymerized styrene resin may contain constitutional units other than styrene units. Examples of the monomers that constitute the constitutional units other than styrene units in the (B) bulk polymerized styrene resin include maleimide-based monomers such as butadiene, acrylonitrile, maleimide, N-methylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, etc., acrylamide-based monomers such as acrylamide, N-methylacrylamide, etc., unsaturated acid anhydrides such as maleic anhydride, itaconic anhydride, etc., unsaturated acids such as acrylic acid, methacrylic acid, etc., glycidyl acrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, methoxypolyethylene glycol methacrylate, and the like.

[0062] (B) The proportion of styrene units in the bulk polymerized styrene resin is preferably 50% by mass or more, more preferably 50% to 99% by mass, in all the constitutional units. The proportion of styrene units in the (B) bulk polymerized styrene resin is more preferably 60% by mass or more, further preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 85% by mass or more, and preferably 99% by mass or less, more preferably 98% by mass or less, further preferably 96% by mass or less, still more preferably 94% by mass or less, even more preferably 92% by mass or less. By setting it below the upper limit value, the impact resistance of the obtained molded product tends to be further improved. Also, by setting it above the lower limit value, the transparency of the obtained molded product tends to be further improved. Note that the (B) bulk polymerized styrene resin may contain only one kind of styrene unit or two or more kinds of styrene units. When two or more kinds are contained, the total amount preferably falls within the above range.

[0063] (B) The bulk polymerized styrene-based resin preferably contains styrene units and butadiene units. The proportion of butadiene units in the (B) bulk polymerized styrene-based resin is preferably 1% by mass or more, more preferably 5% by mass or more, still more preferably 7% by mass or more, even more preferably 10% by mass or more, may be 12% by mass or more, and may even be 15% by mass or more. By setting it to the above lower limit or more, the impact resistance of the obtained molded product tends to improve. Further, the proportion of the butadiene units may be 19% by mass or less. By setting it to the above upper limit or less, the light resistance tends to be further improved.

[0064] Specifically, HIPS (High Impact Polystyrene) resin, ABS (Acrylonitrile / Butadiene / Styrene copolymer) resin, AS (Acrylonitrile / Styrene copolymer) resin, ASA (Acrylonitrile / Styrene / Acrylic copolymer) resin, AES (Acrylonitrile / Ethylene / Styrene copolymer) resin, MS ((Meth)acrylate / Styrene copolymer) resin, MBS ((Meth)acrylate / Butadiene / Styrene) resin, etc. may be mentioned, and it is preferable to contain HIPS resin and / or ABS resin, and more preferably to contain HIPS resin. Or, two or more of the above resins may be used in combination.

[0065] The HIPS resin is a polymer in which a rubber-like polymer made of butadiene rubber or the like is dispersed in a matrix made of an aromatic vinyl polymer such as polystyrene in a particulate state. The HIPS resin can be obtained, for example, by dissolving a rubber-like polymer in a mixed solution of an aromatic vinyl monomer and an inert solvent, stirring, and performing bulk polymerization. Further, the HIPS resin may be, for example, a mixture obtained by mixing a separately obtained aromatic vinyl polymer with a polymer obtained by dissolving and polymerizing a rubber-like polymer in a mixed solution of an aromatic vinyl monomer and an inert solvent. Further, the HIPS resin may contain a graft copolymer obtained by graft polymerizing a styrene monomer onto a trunk polymer of polybutadiene or a styrene-butadiene random copolymer.

[0066] In the HIPS resin, the matrix portion composed of an aromatic vinyl polymer is not particularly limited. However, when trichlorobenzene is used as a solvent and measured by the GPC (gel permeation chromatography) method at 135°C, the polystyrene-reduced mass average molecular weight is preferably 100,000 or more, more preferably 150,000 or more. Also, regarding the average particle diameter of the rubber-like polymer, there is no particular limitation, but generally, 0.4 to 6.0 μm is appropriate.

[0067] As described above, in the resin composition of the present invention, the content of the (B) bulk polymerized styrene resin is 1 to 20 parts by mass, preferably 2 to 18 parts by mass, more preferably 3 to 16 parts by mass, and even more preferably 4 to 13 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin. By setting the content to be equal to or higher than the lower limit value, the impact resistance of the obtained molded product tends to be further improved. By setting the content to be equal to or lower than the upper limit value, the appearance defects of the obtained molded product tend to be further improved. Note that the resin composition of the present invention may contain only one kind of the (B) bulk polymerized styrene resin, or may contain two or more kinds. When two or more kinds are contained, it is preferable that the total amount is within the above range.

[0068] [(C) hindered amine light stabilizer] The resin composition of the present invention contains 0.01 to 1.00 parts by mass of the (C) hindered amine light stabilizer with respect to 100 parts by mass of the (A) polycarbonate resin. The molecular weight of the (C) hindered amine light stabilizer is 1000 or more.

[0069] It is known that when a hindered amine light stabilizer is blended into a resin composition containing a polycarbonate resin and a styrene resin, although the light resistance is improved, the retention stability and the resistance to wet heat may deteriorate. In the resin composition of the present invention, this problem is solved by using a high molecular weight hindered amine light stabilizer. This is presumably because, compared with the case of a low molecular weight, the concentration of the reaction site tends to be relatively low, and the probability of attacking the carbonate bond of the polycarbonate resin is low, resulting in the retention thermal stability and the resistance to wet heat being maintained.

[0070] (C) The molecular weight of the hindered amine light stabilizer is preferably 2,000 or more, more preferably 3,000 or more. By setting it to be the above lower limit value or more, the heat resistance of (C) the hindered amine light stabilizer itself (during extrusion, molding, and light resistance tests) and the effect of suppressing gas generation during molding tend to be further improved. Further, the upper limit of the molecular weight is preferably 10,000 or less, more preferably 5,000 or less. By setting it to be the above upper limit value or less, the compatibility with the resin tends to be further improved. Here, the molecular weight of the hindered amine light stabilizer (C) can be the number average molecular weight in terms of polystyrene measured by GPC. When using a simple substance with a clear structure, the value calculated from its structural formula can be adopted, and when using a commercially available product, the value described in the catalog may be adopted.

[0071] (C) The hindered amine light stabilizer may be any of N-H type, N-R type, and N-OR type. For example, one or more selected from the group consisting of compounds having the structures represented by the following formulas (C-1) to (C-3) can be used. An example of the N-H type is a compound having the structure represented by the following formula (C-1), an example of the N-R type is a compound having the structure represented by the following formula (C-2), and an example of the N-OR type is a compound having the structure represented by the following formula (C-3).

[0072] [Chemical formula]

[0073] In formulas (C-1) to (C-3), R 7 ~R 9 each independently represents an alkyl group having 1 to 5 carbon atoms, and m1 to m3 each independently represents an integer of 0 to 4. R 10 represents an organic group, and R 11 represents an organic group or a hydrogen atom. Further, * represents the bonding position with other sites.

[0074] In formulas (C-1) to (C-3), R 7 ~R 9 is preferably a methyl group, and m1 to m3 are each independently preferably 0 or 1.

[0075] In formulas (C-2) to (C-3), the organic group represented by R 10 ~R 11 may be a monovalent organic group or a polyvalent linking group. The organic group represented by R 10 ~R 11 is preferably an organic group having a molecular weight of 15 to 500, more preferably an organic group having a molecular weight of 15 to 300. Examples of the polyvalent linking group include an alkylene group, a phenylene group, -O-, -C(=O)-, or a group composed of one or more combinations of an alkylene group, a phenylene group, -O- and -C(=O)-. Examples of the monovalent organic group include an alkyl group, a phenyl group, -L 12 -R 12 (where L 12 is a group composed of an alkylene group, a phenylene group, -O-, -C(=O)-, or one or more combinations of an alkylene group, a phenylene group, -O- and -C(=O)-, and R 12 is a hydrogen atom, an alkyl group or a phenyl group) and the like.

[0076] (C) The hindered amine light stabilizer is preferably a compound having a structure represented by formula (C-1), more preferably having a structure represented by formula (C-1) and m1 being 0.

[0077] (C) The hindered amine light stabilizer preferably contains a total of 4 or more structures selected from formulas (C-1) to (C-3) in one molecule, more preferably 5 to 15, and even more preferably 6 to 10.

[0078] (C) Hindered amine light stabilizers preferably have a number average molecular weight of 1,000 or more, and more preferably have a number average molecular weight of 1,000 or more and contain a total of 4 or more structures selected from formulas (C-1) to (C-3) in one molecule.

[0079] Examples of those containing the structure represented by formula (C-1) include polymer compounds having the structure represented by formula (C-1) introduced into the side chain. Examples of those containing the structure represented by formula (C-2) or (C-3) include polymer compounds having formula (C-2) or (C-3) introduced into the main chain or side chain.

[0080] Specifically, the (C) hindered amine light stabilizer preferably has a structure represented by the following formula (HALS-1) or formula (HALS-2), and more preferably has a structure represented by formula (HALS-1).

[0081]

Chemical formula

[0082] In formula (HALS-1), Y 1 , Y 2 each independently represents a group represented by the following formula (Y-1) (* is the bonding position with another site) or a nitrogen atom. Y 1 , Y 2 are preferably the same group, and preferably a group represented by the following formula (Y-1).

[0083]

Chemical formula

[0084] In formula (HALS-1), W 1 represents an alkylene group. The alkylene group represented by W 1 may be unsubstituted or have a substituent. The number of carbon atoms of the alkylene group (including the substituent when having a substituent) is preferably 2 to 50, more preferably 5 to 40, and even more preferably 10 to 30.

[0085] In formula (HALS-1), W 2 represents an alkylene group or *-T(NR 30 R 31 ). (T is a triazine ring (particularly, a 1,3,5-triazine ring), and R 30 , R 31 are each independently a hydrogen atom, an alkyl group, or a group represented by any of the above formulas (C-1) to (C-3). * represents the bonding position to another site.)

[0086] When W 2 is an alkylene group, the alkylene group may be unsubstituted or have a substituent, and may be linear, branched, or cyclic. Further, the number of carbon atoms of the alkylene group (including the substituent when having a substituent) is preferably 2 to 50, more preferably 5 to 40, and even more preferably 10 to 30.

[0087] When W 2 is *-T(NR 30 R 31 ), and at least one of R 30 , R 31 is an alkyl group, the alkyl group may be unsubstituted or have a substituent, and may be linear, branched, or cyclic. Further, the number of carbon atoms of the alkyl group (including the substituent when having a substituent) is preferably 1 to 15, more preferably 5 to 10.

[0088] When W 2 is *-T(NR 30 R 31 ), and at least one of R 30 , R 31 is a group represented by any of the above formulas (C-1) to (C-3), R 10 in the above formula (C-2) is preferably an alkyl group having 1 to 8 carbon atoms, and R 11 in the above (C-3) is preferably an alkyl group having 1 to 8 carbon atoms or a hydrogen atom.

[0089] When W 2is preferably an alkylene group and more preferably the same group as W. 1 is more preferably the same group as W.

[0090] In formula (HALS-1), R 20 represents an organic group containing a structure represented by any of the above formulas (C-1) to (C-3). R 20 is preferably an organic group having a molecular weight of 140 to 700, and more preferably an organic group having a molecular weight of 140 to 550.

[0091] R 20 is a group represented by any of the above formulas (C-1) to (C-3) or *-T(NR 32 R 33 )(NR 34 R 35 )(where T is a triazine ring (especially a 1,3,5-triazine ring), and R 32 to R 35 are each independently a hydrogen atom, an alkyl group or a group represented by any of the above formulas (C-1) to (C-3), and at least one of R 32 to R 35 is a group represented by any of the above formulas (C-1) to (C-3). * is the bonding position to another site.). It is preferably a group represented by any of the above formulas (C-1) to (C-3), more preferably a group represented by any of the above formulas (C-1) to (C-3), and even more preferably a group represented by the above formula (C-1). At this time, R 10 in the above formula (C-2) is preferably an alkyl group having 1 to 8 carbon atoms, and R 11 in the above (C-3) is preferably an alkyl group having 1 to 8 carbon atoms or a hydrogen atom.

[0092] In formula (HALS-1), R 21 represents an organic group containing a structure represented by any of the above formulas (C-1) to (C-3) or an alkyl group. R 21 is preferably an organic group having a molecular weight of 140 to 700, and more preferably an organic group having a molecular weight of 140 to 550.

[0093] R 21When it is an organic group containing a structure represented by any of the above formulas (C-1) to (C-3), R 21 is a group represented by any of the above formulas (C-1) to (C-3) or *-T(NR 32 R 33 )(NR 34 R 35 )(T is a triazine ring (especially, 1,3,5-triazine ring), and R 32 ~R 35 are each independently a hydrogen atom, an alkyl group or a group represented by any of the above formulas (C-1) to (C-3), and at least one of R 32 ~R 35 is a group represented by any of the above formulas (C-1) to (C-3). * is the bonding position to other sites.). It is preferably a group represented by any of the above formulas (C-1) to (C-3), more preferably a group represented by any of the above formulas (C-1) to (C-3), and even more preferably a group represented by the above formula (C-1). At this time, R 10 in the above formula (C-2) is preferably an alkyl group having 1 to 8 carbon atoms, and R 11 in the above (C-3) is preferably an alkyl group having 1 to 8 carbon atoms or a hydrogen atom.

[0094] In formula (HALS-1), q is a real number of 1 or more, preferably a real number of 1 to 10, more preferably a real number of 2 to 10, and even more preferably a real number of 3 to 5.

[0095] Among the compounds represented by formula (HALS-1), those represented by formula (HALS-1a) are preferred.

[0096]

Chemical formula

[0097] In formula (HALS-1a), R 20 , R 21 , and q have the same meanings as in formula (HALS-1), and the preferred embodiments are also the same.

[0098] In formula (HALS-1a), R 22 ~R25 Each independently represents a hydrogen atom, an alkyl group or a phenyl group. R 22 ~R 25 The alkyl group and phenyl group represented by are unsubstituted or may have a substituent. The alkyl group may be linear, branched or cyclic. The number of carbon atoms of the alkyl group (including the substituent when having a substituent) is preferably 1 to 50, more preferably 6 to 40, and even more preferably 10 to 30.

[0099] Among them, R 20 、R 21 are each independently preferably a group represented by any of the above formulas (C-1) to (C-3), and it is more preferable that both R 20 and R 21 are the same group represented by any of the above formulas (C-1) to (C-3), and it is even more preferable that both R 20 and R 21 are the group represented by the above (C-1).

[0100] Also, it is preferable that R 22 ~R 24 are hydrogen atoms and R 25 is an alkyl group, and it is more preferable that R 22 ~R 24 are hydrogen atoms and R 25 is an alkyl group having 10 to 30 carbon atoms.

[0101]

Chemical formula

[0102] In formula (HALS-2), R 40 、R 41 each independently represents an alkylene group. The alkylene group may be unsubstituted or may have a substituent, and may be linear, branched or cyclic. The number of carbon atoms of the alkylene group (including the substituent when having a substituent) is preferably 1 to 10, more preferably 2 to 6.

[0103] In formula (HALS-2), n1 is a real number from 2 to 25, preferably a real number from 5 to 20, and more preferably a real number from 10 to 15.

[0104] As the hindered amine light stabilizer (C), specifically, for example, "Uvinul® 5050H", "Tinuvin® 622SF", "Tinuvin XT-850", "Tinuvin XT-855", "Tinuvin NOR 371FF", "Flamestab® NOR 116 FF", etc. manufactured by BASF can be mentioned.

[0105] As described above, the content of the hindered amine light stabilizer (C) is 0.01 to 1.00 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin. By setting it within such a range, while maintaining the retention heat stability and moisture-heat resistance of the resin composition, the light resistance of the obtained molded product tends to be further improved. The content of the hindered amine light stabilizer (C) is preferably 0.05 parts by mass or more, more preferably 0.10 parts by mass or more, and even more preferably 0.20 parts by mass or more with respect to 100 parts by mass of the (A) polycarbonate resin. Also, the content of the hindered amine light stabilizer (C) is preferably 0.90 parts by mass or less, more preferably 0.80 parts by mass or less, and even more preferably 0.70 parts by mass or less with respect to 100 parts by mass of the (A) polycarbonate resin. Note that the hindered amine light stabilizer (C) may be contained only in one kind or two or more kinds in the resin composition of the present invention. When two or more kinds are contained, it is preferable that the total amount is within the above range.

[0106] [Other Components] The resin composition of the present invention may contain other components other than the above (A) to (C) as necessary, as long as the desired physical properties are not significantly impaired. Note that one kind of other component may be contained, or two or more kinds may be contained in any combination and ratio.

[0107] [(D) Ultraviolet Absorber] The resin composition of the present invention may contain (D) an ultraviolet absorber. By containing the ultraviolet absorber, a molded article excellent in light resistance can be obtained. Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, benzoate-based ultraviolet absorbers, hindered amine-based ultraviolet absorbers, triazine-based ultraviolet absorbers, benzoxazine-based ultraviolet absorbers, and malonic ester ultraviolet absorbers, and benzotriazole-based ultraviolet absorbers are preferred.

[0108] Examples of benzotriazole-based ultraviolet absorbers include 2-(2-hydroxy-5-t-octylphenyl)-2H-benzotriazole, 2-(3-t-butyl-2-hydroxy-5-methylphenyl)-5-chloro-2H-benzotriazole, 2,4-di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol, 2-[5-chloro(2H)-benzotriazol-2-yl]-4,6-di(tert-pentyl)phenol, 3-[3-tert-butyl-5-(5-chloro-2H-benzotriazol-2-yl)-4-hydroxyphenyl]octyl propionate, 2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methylphenol, 2-(2H-benzotriazol-2-yl)-p-cresol, 2-[(2H)-benzotriazol-2-yl]-4,6-bis-(1-methyl-1-phenylethyl)phenol, 2,2'-methylenebis[6-(benzotriazol-2-yl)-4-t-octylphenol], 2-(2-hydroxy-3,5-di-tert-butylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-2H-benzotriazole, 2-(3,5-di-tert-octyl-2-hydroxyphenyl)-2H-benzotriazole, 2-(3,5-di-tert-amyl-2-hydroxyphenyl)-2H-benzotriazole, 2-(3-lauryl-5-methyl-2-hydroxyphenyl)-2H-benzotriazole, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-methylphenyl)methane, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-(1,1,3,3-tetramethylbutyl)phenyl)methane, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-cumylphenyl)methane, 1,1-bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-methylphenyl)octane, 1,1-bis(3-(2H-5-chlorobenzotriazol-2-yl)-2-hydroxy-5-methylphenyl)octane, 1,2-Ethanediylbis(3-(2H-benzotriazol-2-yl)-2-hydroxybenzoate), 1,12-dodecanediylbis(3-(2H-benzotriazol-2-yl)-4-hydroxybenzoate), 1,3-cyclohexanediylbis(3-(5-chloro-2H-benzotriazol-2-yl)-2-hydroxybenzoate), 1,4-butanediylbis(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-methylphenyl)ethanoate, 3,6-dioxa-1,8-octanediylbis(3-(5-methoxy-2H-benzotriazol-2-yl)-4-hydroxyphenyl)ethanoate, 1,6-hexanediylbis(3-(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl)propionate), p-xylenebis(3-(3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl)propionate), bis(3-(2H-benzotriazol-2-yl)-4-hydroxytoxyl)malonate, bis(2-(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-octylphenyl)ethyl)terephthalate, bis(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-propyltoxyl)octadioate, 2-(2H-benzotriazol-2-yl)-6-phthalimidomethyl-4-methylphenol, 2-(2H-benzotriazol-2-yl)-6-phthalimidoethyl-4-methylphenol, 2-(2H-benzotriazol-2-yl)-6-phthalimidooctyl-4-methylphenol, 2-(2H-benzotriazol-2-yl)-6-phthalimidomethyl-4-tert-butylphenol, 2-(2H-benzotriazol-2-yl)-6-phthalimidomethyl-4-cumylphenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(phthalimidomethyl)phenol and the like can be mentioned.,

[0109] The (D) ultraviolet absorber used in the present invention is preferably the one represented by the following formula (UV).

[0110] [Chemical formula]

[0111] In formula (UV), R 50 is a hydrogen atom or a chlorine atom, and R 51 is an alkyl group having 1 to 20 carbon atoms, and R 52 is a hydrogen atom or an organic group.

[0112] R 50 is a hydrogen atom or a chlorine atom, and a hydrogen atom is preferred.

[0113] R 51 The alkyl group represented by may be unsubstituted or may have a substituent. Further, it may be linear, branched or cyclic, but is preferably branched. The carbon number of the alkyl group represented by R 51 (when having a substituent, including the carbon number including the substituent) is preferably 4 or more, more preferably 5 or more, still more preferably 6 or more, even more preferably 7 or more, and preferably 15 or less, more preferably 10 or less. R 51 is preferably a t-octyl group.

[0114] R 52 is a hydrogen atom or an organic group, and a hydrogen atom, an organic group containing a benzotriazole ring, an alkyl group or an alkoxy group are preferred, a hydrogen atom or an organic group containing a benzotriazole ring is more preferred, and an organic group containing a benzotriazole ring is still more preferred. The organic group containing a benzotriazole ring is preferably an organic group containing a 2-(hydroxyphenyl)benzotriazole ring, more preferably an organic group containing a 2-(alkylhydroxyphenyl)benzotriazole ring, and still more preferably an organic group containing a 2-(octylhydroxyphenyl)benzotriazole ring. The organic group containing a benzotriazole ring is specifically preferably a group containing a structure represented by the following formula (UV-1).

[0115] [Chemical]

[0116] In formula (UV-1), R 50 is a hydrogen atom or a chlorine atom. R 51 is an alkyl group having 1 to 20 carbon atoms. L is a single bond or a divalent linking group, and * is the bonding position with formula (UV).

[0117] In formula (UV-1), R 50 , R 51 is synonymous with R 50 , R 51 in formula (UV), and the preferred ranges are also the same. R 50 , R 51 in formula (UV-1) and R 50 , R 51 in formula (UV) may be the same or different from each other, but it is preferably the same. L is a single bond, an alkylene group having 1 to 12 carbon atoms, -R 53 -COO-R 54 -OCO-R 55 -, or -R 53 -OCO-R 54 -COO-R 55 -(R 53 , R 55 are each independently a single bond or an alkylene group having 1 to 5 carbon atoms, and R 54 is an alkylene group having 1 to 12 carbon atoms or a phenylene group. ) is preferred, a single bond or an alkylene group having 1 to 10 carbon atoms is more preferred, and a single bond or a methylene group is even more preferred.

[0118] In addition to the above, the ultraviolet absorbers that can be used in the present invention can adopt those described in paragraph 0051 of JP-A No. 2021-041614, paragraph 0053 of JP-A No. 2020-158596, paragraphs 0059 to 0062 of JP-A No. 2016-216534, and paragraphs 0069 to 0082 of JP-A No. 2018-178019, and the contents of these are incorporated herein.

[0119] When the resin composition of the present invention contains (D) an ultraviolet absorber, the content of (D) the ultraviolet absorber is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, still more preferably 0.02 parts by mass or more, and even more preferably 0.05 parts by mass or more with respect to 100 parts by mass of (A) the polycarbonate resin. By setting the content to be equal to or higher than the lower limit value, the light resistance of the resin composition tends to be further improved. Further, the content of (D) the ultraviolet absorber is preferably 1.00 part by mass or less, more preferably 0.90 part by mass or less, still more preferably 0.80 part by mass or less, and even more preferably 0.70 part by mass or less with respect to 100 parts by mass of (A) the polycarbonate resin. By setting the content to be equal to or lower than the upper limit value, the light resistance of the molded article obtained without lowering the initial hue, mechanical properties, and heat resistance tends to be further improved. Incidentally, (D) the ultraviolet absorber may be contained alone or in two or more kinds in the resin composition of the present invention. When two or more kinds are contained, it is preferable that the total amount is within the above range.

[0120] When the resin composition of the present invention contains (D) an ultraviolet absorber, the mass ratio of (D) the ultraviolet absorber to (C) the hindered amine light stabilizer ((D) ultraviolet absorber / (C) hindered amine light stabilizer) is preferably 3.50 or less, preferably 2.50 or less, more preferably 1.50 or less, still more preferably less than 1.00, even more preferably 0.80 or less, and even more preferably 0.60 or less. By setting the content to be equal to or lower than the upper limit value, the initial hue, mechanical properties, and heat resistance tend to be maintained higher. The mass ratio of (D) the ultraviolet absorber to (C) the hindered amine light stabilizer is preferably 0.10 or more, more preferably 0.30 or more, and still more preferably 0.40 or more. By setting the content to be equal to or higher than the lower limit value, the light resistance can be further improved while maintaining high contravening performance.

[0121] [(E) Transesterification inhibitor] The resin composition of the present invention may contain (E) a transesterification inhibitor. Examples of (E) the transesterification inhibitor include organic phosphate ester compounds and alicyclic epoxy compounds.

[0122] Examples of the organophosphoric acid ester compound include organophosphoric acid esters such as monoalkyl acid phosphate, dialkyl acid phosphate, monoalkenyl acid phosphate, and dialkenyl acid phosphate, and metal salts thereof. Among them, distearyl acid phosphate and / or monostearyl acid phosphate are preferable, and mixtures thereof are more preferable. Further, the organophosphoric acid ester metal salt is preferably a zinc salt and / or an aluminum salt, and a mixture of a zinc salt of distearyl acid phosphate and a zinc salt of monostearyl acid phosphate is more preferable.

[0123] Examples of the alicyclic epoxy compound include 3,4-epoxycyclohexylmethyl 3’,4’-epoxycyclohexanecarboxylate, 1,2-epoxy-4-vinylcyclohexane, 3,4-epoxycyclohexylmethyl (meth)acrylate, 1-epoxyethyl-3,4-epoxycyclohexane, 3,4-epoxycyclohexylmethanol, bis(3,4-epoxycyclohexylmethyl)adipate, limonene diepoxide, dicyclopentadiene diepoxide, tricyclopentadiene diepoxide, 1,2:5,6-diepoxyhexahydroindane, 5,12-dioxahexacyclo[7.6.1.0 2,8 .0 4,6 .0 10,15 .0 11,13 hexadecane, alicyclic epoxy-modified silicone, alicyclic epoxy-modified silicate oligomer, and the like.

[0124] Specific examples of the organophosphoric acid ester include, for example, "JP-518Zn" manufactured by Johoku Chemical Industry Co., Ltd., "AX-71" manufactured by ADEKA Corporation, and the like. Specific examples of the alicyclic epoxy compound include "Celloxide (registered trademark) 2021P" manufactured by Daicel Corporation, and the like.

[0125] When the resin composition of the present invention contains (E) a transesterification inhibitor, the content of (E) the transesterification inhibitor is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and further preferably 0.05 parts by mass or more with respect to 100 parts by mass of (A) the polycarbonate resin. By setting it to the above lower limit value or more, the retention heat stability and the heat and humidity resistance of the resin composition tend to be further improved. Further, the content of (E) the transesterification inhibitor is preferably 1.00 parts by mass or less, and more preferably 0.80 parts by mass or less with respect to 100 parts by mass of (A) the polycarbonate resin. By setting it to the above upper limit value or less, the processability of the resin composition and the color developability and heat resistance of the obtained molded product tend to be maintained at a high level. Incidentally, (E) the transesterification inhibitor may be contained alone in one kind or in two or more kinds in the resin composition of the present invention. When two or more kinds are contained, it is preferable that the total amount is within the above range.

[0126] When the resin composition of the present invention contains (E) a transesterification inhibitor, the mass ratio of (C) the hindered amine-based light stabilizer to (E) the transesterification inhibitor ((C) the hindered amine-based light stabilizer / (E) the transesterification inhibitor) is preferably 0.50 or more, more preferably 1.00 or more, further preferably 5.00 or more, and even more preferably 10.00 or more. By setting it to the above lower limit value or more, the retention heat stability and the heat and humidity resistance tend to be further improved while maintaining the color developability and light resistance of the obtained molded product. Further, (C) the hindered amine-based light stabilizer / (E) the transesterification inhibitor is preferably 100 or less, more preferably 80 or less, and further preferably 70 or less. By setting it to the above upper limit value or less, side effects (deterioration of carbonate bonds) due to (C) the hindered amine-based light stabilizer can also be highly suppressed while maintaining high light resistance.

[0127] [(F) Colorant] The resin composition of the present invention may contain (F) a colorant. (F) The colorant may be a pigment or a dye, but a dye is preferred. Further, (F) the colorant may be a colored colorant or an achromatic colorant.

[0128] Examples of inorganic pigments include sulfide pigments such as carbon black, cadmium red, cadmium yellow, etc.; silicate pigments such as ultramarine; oxide pigments such as titanium oxide, zinc white, lead white, chromium oxide, iron black, titanium yellow, zinc-iron brown, titanium-cobalt green, cobalt green, cobalt blue, copper-chromium black, copper-iron black, etc.; chromate pigments such as lead yellow, molybdate orange, etc.; ferrocyanide pigments such as Prussian blue, etc.

[0129] Examples of organic pigments and / or organic dyes include phthalocyanine dyes and pigments such as copper phthalocyanine blue, copper phthalocyanine green, etc.; azo dyes and pigments such as nickel azo yellow, etc.; condensed polycyclic dyes and pigments such as methine dyes, pyrazolone dyes, thioindigo, perinone, perylene, quinacridone, dioxazine, isoindolinone, quinophthalone, etc.; anthraquinone dyes, heterocyclic dyes, methyl dyes, etc.

[0130] In the present invention, it is preferable that the (F) colorant contains a black pigment and / or a black dye, and more preferably contains a black dye.

[0131] When the resin composition of the present invention contains a colorant, the content of the colorant is preferably 0.01 part by mass or more, more preferably 0.10 part by mass or more, based on 100 parts by mass of the (A) polycarbonate resin. Also, it is preferably 5.00 parts by mass or less, more preferably 3.00 parts by mass or less, and still more preferably 2.00 parts by mass or less. By setting the content of the colorant within the above range, the addition effect of the colorant can be more effectively exerted. Note that the resin composition of the present invention may contain only one kind of colorant or two or more kinds of colorants. When two or more kinds are contained, the total amount is preferably within the above range.

[0132] In addition, the resin composition of the present invention may contain various resin additives such as stabilizers (heat stabilizers, antioxidants, etc.), mold release agents, antistatic agents, flame retardants, flame retardant aids, antifogging agents, antiblocking agents, fluidity improvers, plasticizers, dispersants, antibacterial agents, and other thermoplastic resins. For details of these, reference can be made to the descriptions in paragraphs 0059 to 0080 of JP-A-2014-065901 and paragraphs 0069 to 0093 of JP-A-2018-165017, and this content is incorporated herein.

[0133] [Stabilizer] The resin composition of the present invention may contain a stabilizer. Examples of the stabilizer include heat stabilizers and antioxidants. Examples of the stabilizer also include phenolic, amine-based, phosphorus-based, thioether-based, etc. Among them, the stabilizer is preferably a phosphorus-based heat stabilizer and / or a phenolic antioxidant.

[0134] [Phosphorus-based heat stabilizer] As the phosphorus-based heat stabilizer, any known one can be used. Specific examples include oxo acids of phosphorus such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; metal acid pyrophosphates such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate; phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; organic phosphate compounds, organic phosphite compounds, organic phosphonite compounds, etc., and organic phosphite compounds are particularly preferred.

[0135] Examples of the organic phosphite compound include triphenyl phosphite, tris(monononylphenyl) phosphite, tris(monononyl / dinonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, didecylmonophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl) octyl phosphite, etc.

[0136] Examples of such organic phosphite compounds include, specifically, for example, "ADEKA STAB (registered trademark; the same shall apply hereinafter) 1178", "ADEKA STAB 2112", "ADEKA STAB HP-10" manufactured by ADEKA Corporation, "JP-351", "JP-360", "JP-3CP" manufactured by Johoku Chemical Industry Co., Ltd., "IRGAFOS (registered trademark; the same shall apply hereinafter) 168" manufactured by BASF, and the like.

[0137] [Phenolic antioxidant] When using a phenolic antioxidant, a hindered phenolic antioxidant is preferably used. Specific examples of hindered phenolic antioxidants include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl [[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphate, 4,6-bis(octylthiomethyl)-o-cresol, ethylene bis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2-ylamino)phenol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, and the like.

[0138] Among them, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferred. Specific examples of such hindered phenol antioxidants include, for example, "Irganox (registered trademark; the same shall apply hereinafter) 1010" and "Irganox 1076" manufactured by BASF, "Adekastab AO-50" and "Adekastab AO-60" manufactured by ADEKA, and the like.

[0139] When the resin composition of the present invention contains a stabilizer, the content of the stabilizer is preferably 0.001 part by mass or more, more preferably 0.005 part by mass or more, and still more preferably 0.010 part by mass or more with respect to 100 parts by mass of the (A) polycarbonate resin. Also, it is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and still more preferably 1 part by mass or less. By setting the content of the stabilizer within the above range, the addition effect of the stabilizer is more effectively exhibited. Note that the resin composition of the present invention may contain only one kind of stabilizer or may contain two or more kinds. When two or more kinds are contained, the total amount is preferably within the above range.

[0140] [Release agent] The resin composition of the present invention may contain a release agent. Examples of the release agent include aliphatic carboxylic acids, salts of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, polysiloxane-based silicone oils, ketone waxes, unmodified polyolefin waxes, acid-modified polyolefin waxes, light amides, and the like. Aliphatic carboxylic acids, salts of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, and acid-modified polyolefin waxes are preferred, and esters of aliphatic carboxylic acids and alcohols are more preferred.

[0141] Details of the release agent can be referred to the descriptions in paragraphs 0055 to 0061 of JP-A-2018-095706, and these contents are incorporated herein.

[0142] When the resin composition of the present invention contains a release agent, the content of the release agent is preferably 0.05 to 3% by mass, more preferably 0.10 to 0.80% by mass, and even more preferably 0.20 to 0.60% by mass with respect to 100 parts by mass of the (A) polycarbonate resin. Note that the resin composition of the present invention may contain only one type of release agent or two or more types of release agents. When two or more types are contained, it is preferable that the total amount is within the above range.

[0143] As the antistatic agent, the descriptions in paragraphs 0063 to 0067 of JP-A-2016-216534 can be referred to, and these contents are incorporated herein. As the flame retardant, the descriptions in paragraphs 0068 to 0075 of JP-A-2016-216534 can be referred to, and these contents are incorporated herein.

[0144] <Physical properties of the resin composition> The melt volume rate (MVR) of the resin composition of the present invention at 260 ° C. and a load of 5 kg is 15.0 cm 3 / 10 min to 50.0 cm 3 / 10 min, and preferably 20.0 cm 3 / 10 min to 40.0 cm 3 / 10 min is more preferable. MVR is measured according to the description of the examples described below.

[0145] It is desirable that the resin composition of the present invention has excellent retention stability. Specifically, the melt volume rate (MVR) of the resin composition of the present invention at 260 ° C. and a load of 5 kg after being retained for 20 minutes is preferably less than 16.0% in terms of the increase rate compared to the case where it is not retained, preferably 8.0% or less, and even more preferably 4.0% or less. The lower limit of the above value is ideally 0%, but 0.1% or more is practical. When the decomposition of the molecules of the resin component occurs, MVR increases, but in the resin composition of the present invention, the decomposition of the molecules can be suppressed, so the retention stability is improved.

[0146] The resin composition of the present invention desirably has excellent color-developing properties. For example, when the resin composition of the present invention is black, it preferably has excellent jet-black properties. The resin composition of the present invention containing a black colorant is molded into a shibo plate (60 mm × 60 mm × 2 mm thick), and when this molded body is measured by the reflection method (under the conditions of C light source and 2° field of view) using a spectrocolorimeter, L* is preferably 4.0 or less, more preferably 3.0 or less, and even more preferably 2.0 or less.

[0147] The resin composition of the present invention desirably has excellent light resistance. Specifically, when the resin composition of the present invention is molded into a plate (60 mm × 60 mm × 2 mm thick) and light irradiation is performed so that the irradiation time is 400 hours (the integrated irradiation dose corresponds to 100 MJ / m 2 ), the color difference ΔE before and after is preferably less than 2.4, more preferably 2.0 or less, even more preferably 1.5 or less, and still more preferably 1.0 or less.

[0148] The resin composition of the present invention preferably has excellent heat and humidity resistance. Specifically, the resin composition of the present invention is subjected to a heat and humidity treatment at a temperature of 105°C and a relative humidity of 100% RH for 25 hours, and then dried at 100°C for 5 hours. The melt volume rate (MVR) at 260°C and a load of 5 kg after that is preferably less than 100.0% in terms of the increase rate compared to the case where no heat and humidity treatment is performed, more preferably 50.0% or less, even more preferably 40.0% or less, and still more preferably 30.0% or less. The lower limit of the above value is ideally 0%, but 0.1% or more is practical.

[0149] <Method for producing a resin composition> There are no restrictions on the method for manufacturing the resin composition of the present invention, and known methods for manufacturing resin compositions can be widely adopted. (A) Polycarbonate resin, (B) bulk polymerized styrene resin, and (C) hindered amine light stabilizer, as well as other components that are blended as necessary, are premixed using various mixers such as tumblers and Henschel mixers, and then melt-kneaded using mixers such as Banbury mixers, rolls, Brabenders, single-screw kneading extruders, twin-screw kneading extruders, and kneaders. The temperature for melt-kneading is not particularly limited, but is usually in the range of 240 to 320 °C.

[0150] <Molded article> The molded article of the present invention is formed from the resin composition of the present invention. The above-described resin composition (for example, pellets) is molded into a molded article by various molding methods. That is, the molded article of the present invention is molded from the resin composition of the present invention. The shape of the molded article is not particularly limited and can be appropriately selected according to the use and purpose of the molded article. Examples include film-like, rod-like, cylindrical, annular, circular, elliptical, polygonal, shaped articles, hollow articles, frame-like, box-like, panel-like, button-like articles, etc.

[0151] The method for molding the molded article is not particularly limited, and conventionally known molding methods can be adopted. Examples include injection molding, injection compression molding, extrusion molding, profile extrusion, transfer molding, blow molding, gas-assisted blow molding, blow molding, extrusion blow molding, IMC (in-mold coating molding) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, pressure molding, etc. In particular, the resin composition of the present embodiment is suitable for molded articles obtained by injection molding, injection compression molding, and extrusion molding. However, it goes without saying that the resin composition of the present invention is not limited to molded articles obtained by these methods.

[0152] The molded article of the present invention can be widely used particularly in applications that require high light resistance, moisture resistance stability, and further retention stability. Specifically, it is preferably used in electric and electronic equipment / parts, OA equipment / parts, information terminal equipment / parts, machine parts, household appliances, vehicle parts (automobile interior and exterior), building members, various containers, leisure goods / groceries, lighting equipment, etc.

Examples

[0153] Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples unless the gist thereof is changed. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. When the measuring instruments used in the examples are difficult to obtain due to being obsolete, etc., measurement can be performed using other instruments having equivalent performance.

[0154] <1. Raw materials> The raw materials shown in Tables 1 to 4 below were used.

[0155]

Table 1

[0156] [Production Example 1: Production of Polycarbonate Resin A1] 26.14 moles (6.75 kg) of bisphenol C (BPC) and 26.79 moles (5.74 kg) of diphenyl carbonate were placed in an aluminum (SUS) reactor (internal volume: 10 liters) equipped with a stirrer and a distillation condenser. After replacing the inside of the reactor with nitrogen gas, the temperature was raised to 220°C over 30 minutes under a nitrogen gas atmosphere. Next, the reaction solution in the reactor was stirred, and cesium carbonate (Cs2CO3) was added as a transesterification catalyst to the reaction solution in the molten state at a ratio of 1.5×10 per 1 mole of BPC -6Add in such a way as to become moles, and stir and brew the reaction solution at 220 °C for 30 minutes under a nitrogen gas atmosphere. Next, reduce the pressure in the reactor to 100 Torr over 40 minutes at the same temperature, and further react for 100 minutes to distill out phenol. Next, raise the temperature in the reactor to 284 °C over 60 minutes and reduce the pressure to 3 Torr, and distill out phenol corresponding to almost the entire theoretical amount of distillate. Next, keep the pressure in the reactor below 1 Torr at the same temperature, and continue the reaction for another 60 minutes to complete the polycondensation reaction. At this time, the stirring rotation speed of the stirrer was 38 revolutions per minute, the temperature of the reaction solution immediately before the end of the reaction was 289 °C, and the stirring power was 1.00 kW. Next, feed the reaction solution in a molten state into a twin-screw extruder, supply butyl p-toluenesulfonate in a molar amount 4 times that of cesium carbonate from the first supply port of the twin-screw extruder, knead with the reaction solution, and then extrude the reaction solution through the die of the twin-screw extruder into a strand shape and cut it with a cutter to obtain pellets of polycarbonate resin A1.

[0157] The MVR of the polycarbonate resin was measured by putting the pellets of the sample to be measured into the cylinder of the melt indexer and measuring the value after heating for 4 minutes under the conditions of 300 °C and a load of 1.2 kg according to the ISO-1133 standard.

[0158] [Table 2]

[0159] [Table 3]

[0160] (C1): Uvinul (registered trademark) 4050FF The structure is shown below.

[0161] [Chemical formula]

[0162] (C2): Uvinul (registered trademark) 5050H The structure is shown below. In the following, p 1 is from 6 to 9.

[0163] [Chemical formula]

[0164] (C3): Tinuvin (registered trademark) PA144 The structure is shown below.

[0165] [Chemical formula]

[0166] (C4): Tinuvin (registered trademark) 622SF The structure is shown below.

[0167] [Chemical formula]

[0168] [Table 4]

[0169] [2. Examples 1 to 17, Comparative Examples 1 to 7] [Compound] Each component described in Tables 1 to 4 was mixed in a tumbler mixer for 20 minutes in the amounts (all in parts by mass) described in Tables 5 to 9, and then supplied to TEM26SX manufactured by Shibaura Machine Co., Ltd. equipped with 1 vent, and kneaded under the conditions of a screw rotation speed of 200 rpm, a discharge amount of 25 kg / hour, and a barrel temperature of 250°C. The molten resin composition extruded in a strand shape was rapidly cooled in a water tank and pelletized using a pelletizer to obtain pellets of the resin composition.

[0170] [MVR (1) and Residence MVR (2)] Place the pellets of the sample to be measured into the cylinder of the melt indexer, and in accordance with the ISO-1133 standard, measure the MVR value (MVR(1)) after heating for 4 minutes and the MVR value of the same sample after heating for 20 minutes (retention MVR(2)) under the conditions of 260°C and a load of 5 kg for 4 minutes.

[0171] [Retention stability] Calculate the increase value of the retention MVR(2) with respect to the above MVR(1) (retention MVR(2) - MVR(1)). Furthermore, calculate the increase rate (%) from the above MVR(1) according to the following formula and evaluate the retention stability. Increase rate (%) = [(retention MVR(2) - MVR(1)) / MVR(1)] × 100 The judgment is as follows: when the increase rate is 8.0% or less, it is marked as "○"; when the increase rate is more than 8.0% and 16.0% or less, it is marked as "△"; when the increase rate is more than 16.0%, it is marked as "×".

[0172] [Blackness (initial hue / blackness L*)] After drying the pellets obtained above at 100°C for 5 hours, use an injection molding machine EC50SXII manufactured by Shibaura Machine Co., Ltd. to perform injection molding at a cylinder temperature of 260°C, a stepped mold with thicknesses of 1 mm / 2 mm / 3 mm, and a mold temperature of 70°C to form three plates (60 mm × 90 mm) with thicknesses of 1 mm / 2 mm / 3 mm. Using a spectrocolorimeter SE7700 manufactured by Nippon Denshoku Industries Co., Ltd., set it to the reflection method, C light source, and 2° field of view, measure at the central part of the 2-mm-thick plate obtained above, and evaluate the blackness. The judgment is as follows: when the L* value is 4.0 or less, it is marked as "○"; when it is more than 4.0, it is marked as "×".

[0173] [Light resistance] After drying the pellets obtained above at 100 °C for 5 hours, using an injection molding machine EC50SXII manufactured by Shibaura Machine Co., Ltd., injection molding was carried out at a cylinder temperature of 260 °C, using a stepped mold with thicknesses of 1 mm / 2 mm / 3 mm, and a mold temperature of 70 °C, to mold three-step plates (60 mm × 90 mm) with thicknesses of 1 mm / 2 mm / 3 mm. The three-step plates with thicknesses of 1 mm / 2 mm / 3 mm obtained by the above method were subjected to a light resistance treatment using a xenon weatherometer under the following light resistance test conditions, and the hue before and after the light resistance treatment in the integrated irradiation amount in the wavelength range of 300 - 400 nm was measured, and the color difference ΔE* was compared. (Light resistance treatment conditions) Equipment used: Atlas Ci4400 Filter / Inner: Type S Filter / Outer: Soda lime Black panel temperature: 89 °C Irradiance: 0.55 W @ 340 nm (65 - 70 W @ 300 - 400 nm) Irradiation time: 400 hours (Integrated irradiation amount: 100 MJ / m 2 Equivalent) No rain Humidity: 50%RH Inside the chamber 63 °C (Evaluation) The hue was measured at the center of the 2 mm thickness of the plate obtained above, using a spectrophotometric color difference meter SE7700 manufactured by Nippon Denshoku Industries Co., Ltd., in reflection method, with C light source and 2° field of view. The judgment was as follows: when the color difference ΔE* was 2.0 or less, it was marked as "○"; when the color difference ΔE* was more than 2.0 and less than 2.5, it was marked as "△"; when the color difference ΔE* was 2.5 or more, it was marked as "×".

[0174] [Damp heat resistance] The pellets obtained above were subjected to a damp heat treatment for 25 hours using a highly accelerated life test device (HAST) EHS-222MD manufactured by Espec under the conditions of a temperature of 105 °C and a relative humidity of 100%RH inside the chamber. After drying the above heat-moisture treated pellets at 100 °C for 5 hours, in accordance with the ISO-1133 standard, the MVR value (MVR after 25-hour heat-moisture treatment, MVR(3)) after heating at 260 °C under a load of 5 kg for 4 minutes was measured. Also, the increase value of MVR(3) relative to MVR(1) (MVR(3) - MVR(1)) was calculated. Furthermore, the increase rate (%) from the above MVR(1) was calculated according to the following formula to evaluate the heat-moisture resistance. Increase rate (%) = [(MVR(3) - MVR(1)) / MVR(1)] × 100 The judgment was as follows: when the increase rate was 50.0% or less, it was marked as "○"; when the increase rate was more than 50.0% and 100.0% or less, it was marked as "△"; when the increase rate was more than 100.0%, it was marked as "×"; and when it was unmeasurable (ND), it was marked as "××".

[0175] [Comprehensive Evaluation] Based on the judgments of the four items of residence stability, jet blackness, light resistance, and heat-moisture resistance, a comprehensive judgment was made according to the following criteria. · When all four are "○": Comprehensive evaluation "◎" · When three are "○" and one is "△": Comprehensive evaluation "○" · When two or more are "△" and there is no "×" or "××" in all four: Comprehensive evaluation "△" · When there is even one "×" or "××": Comprehensive evaluation "×" · When the total number of "×" and "××" is two or more: Comprehensive evaluation "××"

[0176] Tables 5 to 9 show the evaluation results of each item and the evaluation results of the comprehensive judgment.

[0177]

Table 5

[0178]

Table 6

[0179]

Table 7

[0180]

Table 8

[0181]

Table 9

[0182] As is clear from the results of Tables 5 to 8, a resin composition capable of providing a molded article excellent in blackness (color development property), light resistance, retained MVR, and heat and humidity resistance was obtained for the resin composition of the present invention. In particular, a resin composition excellent in stability during retention molding was obtained. On the other hand, it was confirmed that the light resistance was inferior when a hindered amine-based light stabilizer was not contained (Comparative Examples 1 and 2) or when a styrene-based resin derived from emulsion polymerization was used (Comparative Example 5). Further, it was confirmed that when a hindered amine-based light stabilizer having a low molecular weight was used (Comparative Examples 3 and 4), the heat and humidity resistance and the like were inferior.

[0183] Also, as is clear from the results of Table 9, it was confirmed that the blackness was inferior when the polycarbonate resin did not contain the structural unit (a1) (Comparative Examples 6 and 7).

Claims

1. A resin composition comprising (A) a polycarbonate resin, (B) a bulk-polymerized styrene-based resin, and (C) a hindered amine light stabilizer, wherein the (A) polycarbonate resin contains a structural unit (a1) represented by the following formula (1) and a structural unit (a2) represented by the following formula (2), and the mass ratio ((a1) / (a2)) of the structural unit (a1) to the structural unit (a2) is 90 to 10 / 10 to 90, the content of the (B) bulk-polymerized styrene-based resin is 1 to 20 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin, the content of the (C) hindered amine light stabilizer is 0.01 to 1.00 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin, and the molecular weight of the (C) hindered amine light stabilizer is 1000 or more. 【Chemical 1】 In formula (1), R 1 represents a methyl group, R 2 represents a hydrogen atom or a methyl group, and X 1 represents a group represented by the following formula (1-a) or (1-b). 【Chemical 2】 In formulas (1-a) and (1-b), R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z 1 represents a group that combines with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms and optionally having a substituent. 【Chemical Formula 3】 In formula (2), X 2 represents a group represented by the following formula (2-a) or (2-b). 【Chemical 4】 In formulas (2-a) and (2-b), R 5 and R 6 each independently represents a hydrogen atom or a methyl group, and Z 2 represents a group that combines with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms and optionally having a substituent.

2. The resin composition according to claim 1, wherein the (A) polycarbonate resin contains a polycarbonate resin containing the structural unit (a1) represented by the formula (1) and a polycarbonate resin containing the structural unit (a2) represented by the formula (2).

3. The resin composition according to claim 1 or 2, wherein the (B) bulk-polymerized styrene-based resin contains 50% by mass or more of styrene.

4. The resin composition according to claim 3, wherein the (B) bulk-polymerized styrene-based resin contains a high-impact polystyrene (HIPS) resin.

5. The resin composition according to claim 1 or 2, wherein the (C) hindered amine light stabilizer is one or more selected from the group consisting of compounds having structures represented by the following formulas (C-1) to (C-3). [Formula 5] In formulas (C-1) to (C-3), R 7 to R 9 each independently represents an alkyl group having 1 to 5 carbon atoms, and m 1 to m 3 each independently represents an integer of 0 to 4. R 10 represents an organic group, and R 11 represents an organic group or a hydrogen atom. Further, * represents the bonding position to another site.

6. The resin composition according to claim 5, wherein the (C) hindered amine light stabilizer is a compound having a structure represented by the above formula (C-1).

7. The resin composition according to claim 1 or 2, wherein the resin composition contains (D) an ultraviolet absorber.

8. The resin composition according to claim 7, which contains 0.005 to 1.00 parts by mass of the (D) ultraviolet absorber with respect to 100 parts by mass of the (A) polycarbonate resin.

9. The resin composition according to claim 7, wherein the mass ratio ((D) / (C)) of the (D) ultraviolet absorber to the (C) hindered amine light stabilizer is 3.50 or less.

10. The resin composition according to claim 1 or 2, comprising 0.005 to 1.00 parts by mass of an ester exchange inhibitor (E) with respect to 100 parts by mass of the (A) polycarbonate resin.

11. The resin composition according to claim 10, wherein the mass ratio ((C) / (E)) of the (C) hindered amine light stabilizer to the (E) ester exchange inhibitor is 0.50 or more.

12. The resin composition according to claim 1 or 2, comprising 0.01 to 5.00 parts by mass of a colorant (F) with respect to 100 parts by mass of the (A) polycarbonate resin.

13. Pellets comprising the resin composition according to claim 1 or 2.

14. A molded article formed from the pellets according to claim 13.

Images