Resin composition, pellet, and molded article

Abstract

To provide a resin composition having superior flame retardancy and flowability after hygrothermal treatment, as well as a pellet and a molded article formed from the resin composition.SOLUTION: A resin composition comprising 6.5 pts.mass or more to 30 pts.mass or less of a phosphate ester flame retardant (B) relative to 100 pts.mass of a polycarbonate resin (A), wherein the phosphate ester flame retardant (B) has a Na ion content of more than 0 ppm to 30 ppm or less in ICP-AES analysis.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition, a pellet, and a molded article, and more particularly to a resin composition containing a polycarbonate resin as a main component. [Background technology]

[0002] Polycarbonate resin has excellent mechanical and thermal properties, and by imparting flame retardancy, it is used in a variety of applications, mainly in the fields of office automation equipment and electronic and electrical equipment. In recent years, with the trend toward thinner and lighter walls in office automation equipment, home appliances, and other applications, there has been an increasing demand for high-impact resin materials and highly flame-retardant resin materials. Specifically, Patent Document 1 discloses a thermoplastic resin composition comprising 60 to 95 mass% of polycarbonate resin (A) and 5 to 40 mass% of ABS resin (B) produced by bulk polymerization, with 3 to 30 mass parts of a phosphate ester compound (C) and 0.01 to 2 mass parts of a fluoropolymer (D) per 100 mass parts in total of polycarbonate resin (A) and ABS resin (B), wherein the ABS resin (B) has a glass transition temperature in the range of 95 to 108°C. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-227436 Summary of the Invention [Problem to be solved by the invention]

[0004] The resin composition described in Patent Document 1 is said to have excellent flame retardancy. However, with recent technological innovations, there is a demand for further improvement in fluidity after moist heat treatment. The present invention aims to solve these problems and to provide a resin composition that is superior in flame retardancy and fluidity after moist heat treatment, as well as pellets and molded articles formed from the resin composition. [Means for solving the problem]

[0005] In view of the above problems, the present inventors have conducted research and found that the above problems can be solved by blending a phosphate ester-based flame retardant containing a small amount of Na ions into a polycarbonate resin. Specifically, the above problems were solved by the following means. <1> The polycarbonate resin (A) contains 6.5 parts by mass or more and 30 parts by mass or less of a phosphate ester flame retardant (B) relative to 100 parts by mass of the polycarbonate resin (A), A resin composition, wherein the phosphate ester flame retardant (B) has a sodium ion amount of more than 0 ppm and 30 ppm or less as determined by ICP-AES analysis. <2> The phosphate ester-based flame retardant (B) is a phosphate ester represented by formula (P): <1> The resin composition according to claim 1. Formula (P) [ka] (In formula (P), k is an integer of 0 to 5, and a mixture of compounds having different k numbers may be used. In the case of a mixture of phosphate esters having different k numbers, k is the average value of the mixture. X 1 represents a divalent arylene group, p, q, r, and s each independently represent 0 or 1, and R 11 , R 12 , R 13 and R 14 each independently represents an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms. <3> Further, the anti-dripping agent (C) is contained in an amount of 0.1 parts by mass or more and 1 part by mass or less per 100 parts by mass of the polycarbonate resin (A), <1> or <2> The resin composition according to claim 1. <4> Further, the core-shell elastomer (D) is contained in an amount of 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the polycarbonate resin (A), <1> ~ <3> The resin composition according to any one of the above. <5> The composition contains 10 parts by mass or more and 35 parts by mass or less of a graft copolymer (E) containing an aromatic vinyl monomer unit, a vinyl cyanide monomer unit, and a diene rubber polymer unit relative to 100 parts by mass of a polycarbonate resin (A), <1> ~ <4> The resin composition according to any one of the above. <6> the phosphate ester-based flame retardant (B) is a phosphate ester represented by formula (P), Further, the anti-dripping agent (C) is contained in an amount of 0.1 parts by mass or more and 1 part by mass or less per 100 parts by mass of the polycarbonate resin (A), Further, the core-shell elastomer (D) is contained in an amount of 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the polycarbonate resin (A), The composition contains 10 parts by mass or more and 35 parts by mass or less of a graft copolymer (E) containing an aromatic vinyl monomer unit, a vinyl cyanide monomer unit, and a diene rubber polymer unit relative to 100 parts by mass of a polycarbonate resin (A), <1> ~ <5> The resin composition according to any one of the above. Formula (P) [ka] (In formula (P), k is an integer of 0 to 5, and a mixture of compounds having different k numbers may be used. In the case of a mixture of phosphate esters having different k numbers, k is the average value of the mixture. X 1 represents a divalent arylene group, p, q, r, and s each independently represent 0 or 1, and R 11 , R 12 , R 13 and R 14 each independently represents an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms. <7> <1> ~ <6> A pellet of the resin composition according to any one of the above. <8> <1> ~ <6> A molded article formed from the resin composition according to any one of the above items. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a resin composition having excellent flame retardancy and fluidity after moist heat exposure, as well as pellets and molded articles formed from the resin composition. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, an embodiment for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only this embodiment. In this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the upper and lower limits. Furthermore, any combination of the upper and lower limit values ​​of the numerical values ​​in this specification is an example of this embodiment. In this specification, various physical properties and characteristic values ​​are those at 23°C unless otherwise specified. If the measurement methods, etc. described in the standards shown in this specification change from year to year, they will be based on the standards in effect as of January 1, 2024, unless otherwise specified. If the measurement methods, etc. described in the standards shown in this specification are abolished as of January 1, 2024, they will be based on the standards in effect at the time of abolition.

[0008] The resin composition of this embodiment is characterized in that it contains 6.5 to 30 parts by mass of a phosphate ester flame retardant (B) per 100 parts by mass of a polycarbonate resin (A), and the phosphate ester flame retardant (B) has a Na ion content of more than 0 ppm to 30 ppm as determined by ICP-AES analysis. This configuration provides a resin composition with superior flame retardancy and fluidity after moist heat treatment. The details of this embodiment will be described below.

[0009] <Polycarbonate resin (A)> The resin composition of the present embodiment contains a polycarbonate resin (A). The polycarbonate (A) resin is not particularly limited as long as it contains an -[OR-OC(=O)]- unit containing a carbonate bond in the molecular main chain (wherein R is an organic group, preferably a hydrocarbon group, more preferably an aliphatic group, an aromatic group, or both an aliphatic group and an aromatic group, and further has a linear or branched structure). In this embodiment, the polycarbonate resin (A) is preferably an aromatic polycarbonate resin, and more preferably a polycarbonate resin having a bisphenol skeleton. By using such a polycarbonate resin, the obtained molded article can achieve better heat resistance and toughness. In this embodiment, the polycarbonate resin having a bisphenol skeleton preferably contains 90 mol % or more of all structural units of structural units having a bisphenol skeleton, more preferably 90 mol % or more of all structural units of structural units having at least one skeleton of bisphenol A, bisphenol C, and bisphenol AP, and even more preferably 90 mol % or more of all structural units of structural units having a bisphenol A skeleton.

[0010] The viscosity average molecular weight (Mv) of the polycarbonate resin (A) is preferably 10,000 or more, more preferably 12,000 or more, and even more preferably 15,000 or more. By setting it to be equal to or greater than the lower limit, the durability of the obtained molded article tends to be further improved. The upper limit of the viscosity average molecular weight (Mv) of the polycarbonate resin (A) is preferably 50,000 or less, more preferably 40,000 or less, even more preferably 30,000 or less, still more preferably 25,000 or less, and even more preferably 20,000 or less. By setting it to be equal to or less than the upper limit, the molding processability of the molded article tends to be further improved. The viscosity average molecular weight (Mv) was calculated by using methylene chloride as a solvent and an Ubbelohde viscometer to determine the intrinsic viscosity [η] (unit: dL / g) at 25°C, and then using the Schnell viscosity formula, i.e., η = 1.23 × 10 -4 ×Mv 0.83 , means the value calculated from When two or more types of polycarbonate resins (A) are used, the viscosity average molecular weight is the viscosity average molecular weight of the mixture.

[0011] The method for producing the polycarbonate resin (A) is not particularly limited, and polycarbonate resins produced by the conventionally known phosgene method (interfacial polymerization method) or melt method (ester interchange method) can be used. When the melt method is used, a polycarbonate resin with an adjusted amount of OH groups at the terminal groups can be used.

[0012] The polycarbonate resin (A) used in this embodiment may contain recycled products. Recycled products are polycarbonate resins derived from molded products formed from polycarbonate resin, meaning virgin polycarbonate resins that have been subjected to some kind of molding process, and include polycarbonate resin molded products, rejected polycarbonate resin molded products, scraps from the manufacture of polycarbonate resin molded products, etc. Molded products include injection molded products, extrusion molded products, and molded products formed by other manufacturing methods. Examples of recycled polycarbonate resin include those obtained by material recycling, in which recovered used polycarbonate resin molded products are crushed and alkaline washed to be reused as fibers, etc., those obtained by chemical recycling (chemical decomposition method), and those obtained by mechanical recycling. Chemical recycling involves chemically decomposing recovered used polycarbonate resin molded articles, returning them to their raw material level, and resynthesizing the polycarbonate resin.Mechanical recycling, on the other hand, is a method that makes it possible to remove dirt from polycarbonate resin molded articles more reliably than material recycling by carrying out alkaline washing more rigorously than in the material recycling described above, or by vacuum drying at high temperatures. For example, recycled polycarbonate resin can be obtained from used polycarbonate resin molded products by removing foreign matter, crushing and cleaning the product, and then pelletizing the product using an extruder. Examples of used polycarbonate resin molded products include discs, sheets (including films), meter covers, headlamp lenses, water bottles, and face plates for gaming and pachinko machines. The recycled product is preferably a polycarbonate resin in which 90 mol % or more of all constituent units are constituent units having a bisphenol A skeleton. Virgin products refer to products other than recycled products.

[0013] When the polycarbonate resin (A) contained in the resin composition of the present embodiment is blended, the proportion of the recycled product is preferably 1 part by mass or more per 100 parts by mass of the polycarbonate resin (A) (total of the recycled product and the virgin product), and may be 100 parts by mass or less. The resin composition of the present embodiment may contain only one type of recycled polycarbonate resin, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0014] In addition to the above, for details of the polycarbonate resin (A), please refer to the descriptions in paragraphs 0013 to 0041 of JP 2021-084942 A, the descriptions in paragraphs 0030 to 0035 of JP 2021-119211 A, and the descriptions in paragraphs 0008 to 0064 of JP 2023-012167 A, the contents of which are incorporated herein by reference.

[0015] The content of the polycarbonate resin (A) in the resin composition of this embodiment is preferably 70% by mass or more of the resin composition, more preferably 75% by mass or more, and even more preferably 80% by mass or more, and is preferably 95% by mass or less, and more preferably 90% by mass or less. The resin composition of the present embodiment may contain only one type of polycarbonate resin (A), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0016] <Phosphate ester flame retardant (B)> The resin composition of this embodiment contains a phosphate ester-based flame retardant (B) having a Na ion content of more than 0 ppm and not more than 30 ppm as determined by ICP-AES analysis. ppm refers to ppm by mass. By including such a flame retardant, the flame retardancy of the resulting molded article can be further improved. Furthermore, in addition to fluidity after moist heat exposure, impact resistance after moist heat exposure, molecular weight retention after moist heat exposure, flame retardancy after moist heat exposure, weather resistance, thermal stability, and fatigue resistance can be improved. The amount of Na ions in the phosphate ester flame retardant (B) is preferably 0.5 ppm or more, more preferably 1 ppm or more, and even more preferably 3 ppm or more, and is preferably 28 ppm or less, more preferably 20 ppm or less, even more preferably 15 ppm or less, still more preferably 10 ppm or less, and even more preferably 7 ppm or less. By keeping the amount below the upper limit, there is a tendency for the flowability after moist heat treatment, as well as the heat resistance, impact resistance after moist heat treatment, molecular weight retention after moist heat treatment, and flame retardancy after moist heat treatment to be further improved. The resin composition of the present embodiment may contain only one type of phosphate ester-based flame retardant (B), or may contain two or more types. When two or more types are contained, the amount of Na ions relative to the total amount of the phosphate ester-based flame retardants (B) is preferably within the above range.

[0017] The phosphate ester flame retardant (B) is preferably a condensed phosphate ester flame retardant, more preferably a condensed phosphate ester flame retardant represented by formula (P). Formula (P) [ka] (In formula (P), k is an integer of 0 to 5, and a mixture of compounds having different k numbers may be used. In the case of a mixture of phosphate esters having different k numbers, k is the average value of the mixture. X 1 represents a divalent arylene group, p, q, r, and s each independently represent 0 or 1, and R 11 , R 12 , R 13 and R 14each independently represents an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms.

[0018] In formula (P), the compound may be a mixture of compounds having different k values, and in the case of a mixture of condensed phosphate esters having different k values, k is the average value of the mixture. k is usually an integer of 0 to 5, and in the case of a mixture of compounds having different k values, the average k value is preferably 0.5 or more, more preferably 0.6 or more, even more preferably 0.8 or more, particularly preferably 0.95 or more, and is preferably 2 or less, more preferably 1.5 or less, even more preferably 1.2 or less, particularly preferably 1.15 or less.

[0019] Also, X 1 represents a divalent arylene group, for example, a divalent group derived from a dihydroxy compound such as resorcinol, hydroquinone, bisphenol A, 2,2'-dihydroxybiphenyl, 2,3'-dihydroxybiphenyl, 2,4'-dihydroxybiphenyl, 3,3'-dihydroxybiphenyl, 3,4'-dihydroxybiphenyl, 4,4'-dihydroxybiphenyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, or 2,7-dihydroxynaphthalene. Of these, divalent groups derived from resorcinol, bisphenol A, or 3,3'-dihydroxybiphenyl are particularly preferred.

[0020] In formula (P), p, q, r and s each independently represent 0 or 1, with 1 being preferred.

[0021] R in formula (P) 11 , R 12 , R 13 and R 14and respectively represent an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms. Examples of such an aryl group include a phenyl group, a cresyl group, a xylyl group, an isopropylphenyl group, a butylphenyl group, a tert-butylphenyl group, a di-tert-butylphenyl group, and a p-cumylphenyl group, with a phenyl group, a cresyl group, and a xylyl group being more preferred.

[0022] Specific examples of the condensed phosphate ester-based flame retardant represented by formula (P) include aromatic phosphate esters such as triphenyl phosphate (TPP), tricresyl phosphate (TCP), trixylenyl phosphate (TXP), cresyl diphenyl phosphate (CDP), 2-ethylhexyl diphenyl phosphate (EHDP), tert-butylphenyl diphenyl phosphate, bis-(tert-butylphenyl)phenyl phosphate, tris-(tert-butylphenyl)phosphate, isopropylphenyl diphenyl phosphate, bis-(isopropylphenyl)diphenyl phosphate, and tris-(isopropylphenyl)phosphate; and condensed phosphate esters such as resorcinol bis-diphenyl phosphate (RDP), resorcinol bis-dixylenyl phosphate (RDX), bisphenol A bis-diphenyl phosphate (BDP), and biphenyl bis-diphenyl phosphate.

[0023] The acid value of the condensed phosphate ester flame retardant represented by formula (P) is preferably 0.2 mg KOH / g or less, more preferably 0.15 mg KOH / g or less, even more preferably 0.1 mg KOH or less, and particularly preferably 0.05 mg KOH / g or less. The lower limit of the acid value can be set to substantially 0. The content of half ester in the condensed phosphate ester flame retardant represented by formula (P) is preferably 1 mass% or less, more preferably 0.5 mass% or less. By setting the acid value to 0.2 mg KOH / g or less and the half ester content to 1 mass% or less, the thermal stability and hydrolysis resistance of the resulting molded article tend to be further improved.

[0024] The phosphate ester-based flame retardant (B) includes, in addition to the above, polyester resins, polycarbonate resins, and epoxy resins containing a phosphate ester moiety. Please also refer to paragraphs 0030 to 0034 of International Publication No. 2017 / 038737, the contents of which are incorporated herein by reference.

[0025] The content of the phosphate ester-based flame retardant (B) in the resin composition of this embodiment is 6.5 parts by mass or more, and preferably 8 parts by mass or more, per 100 parts by mass of the (A) polycarbonate resin. By ensuring that the content is above the lower limit, char formation during combustion of the resulting molded article can be promoted, further enhancing flame retardancy. The fluidity of the resulting resin composition can also be improved. Furthermore, the content of the phosphate ester-based flame retardant (B) is 30 parts by mass or less, preferably 28 parts by mass or less, more preferably 25 parts by mass or less, and even more preferably 20 parts by mass or less, per 100 parts by mass of the (A) polycarbonate resin. By ensuring that the content is below the upper limit, impact resistance tends to be improved. Furthermore, the heat resistance of the resulting resin composition is improved, and pellet manufacturability also tends to be improved. The resin composition of the present embodiment may contain only one type of phosphate ester-based flame retardant (B), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0026] The resin composition of the present embodiment may or may not contain a flame retardant other than the phosphate ester-based flame retardant (B). Examples of the flame retardant other than the phosphate ester-based flame retardant (B) include alkali metal salts and halogen-based flame retardants. An example of the resin composition of this embodiment is one that is substantially free of flame retardants other than the phosphate ester-based flame retardant (B). "Substantially free" means that the content of flame retardants other than the phosphate ester-based flame retardant (B) among the flame retardants contained in the resin composition is 10% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less of the content of flame retardants other than the phosphate ester-based flame retardant (B).

[0027] <Anti-sagging agent (C)> The resin composition of the present embodiment preferably contains an anti-dripping agent (C). The anti-dripping agent (C) preferably contains a fluoropolymer having fibril-forming ability. Fibril-forming fluoropolymers are easily dispersed in resin compositions and tend to bond together to form fibrous structures. The fluoropolymer capable of forming fibrils preferably has an extremely high molecular weight of 1,000,000 to 10,000,000, and exhibits a tendency to bond together to form fibers under external action such as shear force. Preferred fluoropolymers include tetrafluoroethylene (PTFE) resin, perfluoroalkoxy (PFA) resin, and fluorinated ethylene propylene (FEP) resin, with polytetrafluoroethylene being particularly preferred.

[0028] Examples of fluoropolymers capable of forming fibrils include Teflon (registered trademark) 6J manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd. and Polyflon manufactured by Daikin Industries, Ltd.

[0029] It is also preferable to use the fluoropolymer in the form of an aqueous dispersion. This dispersion is an aqueous dispersion produced by adding a surfactant to a fluororesin latex obtained by ordinary emulsion polymerization, followed by concentration and stabilization. The content of the fluoropolymer in the aqueous dispersion is preferably 20 to 80% by mass, particularly 30 to 70% by mass. Examples of aqueous dispersions of polytetrafluoroethylene include Teflon (registered trademark) 30J manufactured by Mitsui DuPont Fluorochemicals Co., Ltd., Fluon D-1 manufactured by Daikin Industries, Ltd., and polytetrafluoroethylene polymers having a multilayer structure obtained by polymerizing vinyl monomers, such as Metablen A-3800 manufactured by Mitsubishi Rayon Co., Ltd.

[0030] The fibril-forming fluoropolymer preferably has a primary particle size in the range of 0.05 to 1.0 μm, more preferably 0.1 to 0.5 μm. In the resin composition, the fluoropolymer is preferably in the form of fibrils having a thickness of 0.5 microns or less, and the fibrils preferably exist in a network structure and / or branched form.

[0031] The content of the anti-dripping agent (C) in the resin composition of this embodiment is preferably 0.1 parts by mass or more, and more preferably 0.2 parts by mass or more, per 100 parts by mass of the (A) polycarbonate resin. By ensuring that the content is above the lower limit, the anti-dripping effect tends to be more effectively exhibited. Furthermore, the content of the anti-dripping agent (C) is preferably 1 part by mass or less, more preferably 0.8 parts by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of the (A) polycarbonate resin. By ensuring that the content is below the upper limit, the mechanical strength of the obtained molded article tends to be improved, and the appearance also tends to be improved. The resin composition of the present embodiment may contain only one type of anti-dripping agent (C), or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0032] <Core-shell elastomer (D)> The resin composition of the present embodiment preferably contains a core-shell elastomer (D). By containing the core-shell elastomer (D), the impact resistance of the resulting molded article tends to be improved. The core-shell elastomer (D) is particularly preferably a core-shell elastomer having a core layer made of at least one rubber component selected from polybutadiene-containing rubber, polybutyl acrylate-containing rubber, polyorganosiloxane rubber, and an IPN-type composite rubber composed of polyorganosiloxane rubber and polyalkyl acrylate rubber, and a shell layer formed by copolymerizing a (meth)acrylic acid ester around the core layer. The core-shell elastomer preferably contains 40% by mass or more of the rubber component, more preferably 60% by mass or more. Furthermore, the (meth)acrylic acid content is preferably 10% by mass or more. Note that the core-shell elastomer in this embodiment does not necessarily have a clearly distinguishable core layer and shell layer; it is intended to broadly include compounds obtained by graft-polymerizing a rubber component around the core portion.

[0033] Preferred specific examples of the core-shell elastomer (D) include methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), methyl methacrylate-butadiene copolymer (MB), methyl methacrylate-acrylic rubber copolymer (MA), methyl methacrylate-acrylic rubber-styrene copolymer (MAS), methyl methacrylate-acrylic-butadiene rubber copolymer, methyl methacrylate-acrylic-butadiene rubber-styrene copolymer, methyl methacrylate-(acrylic-silicone IPN rubber) copolymer, and the like.

[0034] Examples of such core-shell elastomers (D) include "Paraloid (registered trademark, the same hereinafter) EXL2602," "Paraloid EXL2603," "Paraloid EXL2655," "Paraloid EXL2311," "Paraloid EXL2313," "Paraloid EXL2315," "Paraloid KM330," "Paraloid KM336P," and "Paraloid KCZ201" manufactured by Rohm and Haas Japan; "Metablen (registered trademark, the same hereinafter) C-223A," "Metablen E-901," "Metablen S-2001," and "Metablen SRK-200" manufactured by Mitsubishi Chemical Corporation; "Kane Ace (registered trademark, the same hereinafter) M-511," "Kane Ace M-600," "Kane Ace M-400," "Kane Ace M-580," "Kane Ace M-711," and "Kane Ace MR-01" manufactured by Kaneka Corporation; and "UBESTA" manufactured by UBE Corporation. XPA" and others.

[0035] When the resin composition of this embodiment contains the core-shell elastomer (D), the content thereof is preferably 1 part by mass or more, more preferably 2 parts by mass or more, even more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more, per 100 parts by mass of the polycarbonate resin (A), and is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and even more preferably 7 parts by mass or less. By ensuring that the content is equal to or greater than the lower limit, the impact resistance, including in the low-temperature range, of the resulting molded article tends to be further improved. Meanwhile, by ensuring that the content is equal to or less than the upper limit, the flame retardancy of the resulting molded article tends to be further improved. The resin composition of the present embodiment may contain only one type of core-shell elastomer (D), or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0036] <Graft copolymer (E)> The resin composition of the present embodiment may contain a graft copolymer (E) containing aromatic vinyl monomer units, vinyl cyanide monomer units, and diene rubber polymer units. By containing such a graft copolymer (E), the impact resistance of the resulting molded article can be further improved.

[0037] The graft copolymer (E) is a graft copolymer containing aromatic vinyl monomer units, vinyl cyanide monomer units, and diene rubber polymer units. Examples of the graft copolymer (E) include ABS resin (acrylonitrile-butadiene-styrene copolymer), AES resin (acrylonitrile-ethylene-propylene-styrene copolymer), ACS resin (acrylonitrile-chlorinated polyethylene-styrene copolymer), and AAS resin (acrylonitrile-acrylic elastomer-styrene copolymer), among which ABS resin (acrylonitrile-butadiene-styrene copolymer) is preferred. The ABS resin may be a copolymer consisting of only acrylonitrile monomer, butadiene monomer, and styrene monomer, or may be copolymerized with other monomers in an amount of less than 10% by mass (preferably less than 5% by mass, more preferably less than 3% by mass, and particularly preferably less than 1% by mass). The same applies to other resins such as AES resin.

[0038] As the diene rubber polymer unit forming the ABS resin, for example, rubbers having a glass transition point of 10°C or less, such as polybutadiene, styrene-butadiene copolymer, and acrylonitrile-butadiene, are preferably used. Examples of the vinyl cyanide monomer grafted to the diene rubber polymer unit include acrylonitrile and methacrylonitrile, and examples of the aromatic vinyl monomer grafted to the diene rubber polymer unit include nucleus-substituted styrenes such as styrene, α-methylstyrene, and p-methylstyrene.

[0039] In the ABS resin used in this embodiment, the proportion of diene rubber polymer units in 100% by mass of the ABS resin component is preferably 1% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and is preferably 99% by mass or less, more preferably 65% ​​by mass or less, even more preferably 25% by mass or less. By making the proportion equal to or greater than the lower limit, the impact resistance of the resulting molded article tends to be further improved. On the other hand, by making the proportion equal to or less than the upper limit, the flowability of the resulting molded article tends to be further improved.

[0040] In ABS resins, the weight-average particle size of the diene rubber polymer units is preferably 0.05 to 5.0 μm, more preferably 0.1 to 2.0 μm, and even more preferably 0.2 to 1.5 μm. The rubber particle size distribution may be either a single distribution or one with two or more peaks. Furthermore, the morphology may be either a single-phase distribution or a salami structure formed by the inclusion of an occluded phase around the rubber particles. The rubber particle size is determined by immersing the rubber polymer in a solution of OsO or RuO, staining it, observing it with a transmission electron microscope, and averaging the particle sizes measured for 1,000 or more particles. It has been well known that ABS resins contain copolymers of vinyl cyanide compounds and aromatic vinyl compounds that are not grafted onto diene rubber components. The ABS resin of this embodiment may contain free polymer components generated during the polymerization as described above, or may be a blend of a vinyl compound polymer obtained by separately copolymerizing an aromatic vinyl compound and a vinyl cyanide compound.

[0041] In the ABS resin of this embodiment, the ratio of vinyl cyanide monomer and aromatic vinyl monomer graft-polymerized to the diene rubber polymer units (the ratio of the mass of these monomer components to the mass of the diene rubber polymer units), i.e., the graft ratio, is preferably 1% by mass or more, more preferably 15% by mass or more, and preferably 30% by mass or less, more preferably 25% by mass or less. By setting the ratio at or above the lower limit, the chemical resistance of the resulting molded article tends to be improved. On the other hand, by setting the ratio at or below the upper limit, the flame retardancy of the resulting molded article tends to be improved. Such an ABS resin may be produced by any method such as bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization, but is preferably produced by bulk polymerization.

[0042] The content of the graft copolymer (E) in the resin composition of this embodiment is preferably 10 parts by mass or more, more preferably 12 parts by mass or more, and preferably 35 parts by mass or less, more preferably 30 parts by mass or less, even more preferably 25 parts by mass or less, even more preferably 20 parts by mass or less, and even more preferably 15 parts by mass or less, per 100 parts by mass of the polycarbonate resin (A). By ensuring that the content is equal to or greater than the lower limit, the fluidity of the resulting molded article tends to be improved. Meanwhile, by ensuring that the content is equal to or less than the upper limit, the flame retardancy of the resulting molded article tends to be improved. The resin composition of the present embodiment may contain only one type of graft copolymer (E), or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0043] <Stabilizer> The resin composition of the present embodiment may contain a stabilizer. The stabilizer includes a heat stabilizer and an antioxidant. The stabilizer may be a phenol-based, amine-based, phosphorus-based, or thioether-based stabilizer, among which a phosphorus-based heat stabilizer is preferably used in this embodiment.

[0044] Any known phosphorus-based heat stabilizer can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; metal acid pyrophosphates such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate; phosphates of Group 1 or Group 2 metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds, with organic phosphite compounds being particularly preferred.

[0045] Examples of organic phosphite compounds include triphenyl phosphite, tris(mononylphenyl)phosphite, tris(mononyl / 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, distearyl pentaerythritol diphosphite, bis(decyl)pentaerythritol diphosphite, bis(tridecyl)pentaerythritol diphosphite, and bis(nonylphenyl)pentaerythritol diphosphite. Specific examples of such organic phosphite compounds include "ADK STAB (registered trademark; the same applies hereinafter) 1178," "ADK STAB 2112," and "ADK STAB HP-10" manufactured by ADEKA Corporation, "JP-351," "JP-360," and "JP-3CP" manufactured by Johoku Chemical Industry Co., Ltd., and "IRGAFOS (registered trademark; the same applies hereinafter) 168" manufactured by BASF.

[0046] In addition to the above, the phosphorus-based heat stabilizer used in this embodiment can be found in paragraphs 0127 to 0133 of JP-A-2022-067329, the contents of which are incorporated herein by reference.

[0047] As the phenol-based antioxidant, a hindered phenol-based antioxidant is preferably used. Specific examples of hindered phenol 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(octyl methylthiomethyl)-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.

[0048] Among these, 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 "Irganox (registered trademark; the same applies hereinafter) 1010" and "Irganox 1076" manufactured by BASF, and "ADK STAB AO-50" and "ADK STAB AO-60" manufactured by ADEKA.

[0049] The content of the stabilizer in the resin composition of this embodiment is usually 0.001 part by mass or more, preferably 0.005 part by mass or more, more preferably 0.01 part by mass or more, and even more preferably 0.05 part by mass or more, relative to 100 parts by mass of the polycarbonate resin (A), and is preferably 3 parts by mass or less, more preferably 2 parts by mass or less. By setting the content of the stabilizer within this range, the effect of adding the stabilizer can be more effectively exerted. The resin composition of the present embodiment may contain only one stabilizer, or may contain two or more stabilizers. When two or more stabilizers are contained, the total amount is preferably in the above range.

[0050] <Release agent> The resin composition of the present embodiment 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, and light amides, and the like are preferred.

[0051] Examples of aliphatic carboxylic acids include saturated or unsaturated aliphatic mono-, di-, or tri-carboxylic acids. Aliphatic carboxylic acids also include alicyclic carboxylic acids. Among these, preferred aliphatic carboxylic acids are mono- or di-carboxylic acids having 6 to 36 carbon atoms, with saturated aliphatic mono-carboxylic acids having 6 to 36 carbon atoms being more preferred. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetratriacontanoic acid, montanic acid, adipic acid, and azelaic acid. Examples of salts of aliphatic carboxylic acids include sodium salts, potassium salts, calcium salts, and magnesium salts.

[0052] The aliphatic carboxylic acid in the ester of an aliphatic carboxylic acid and an alcohol can be, for example, the same as the aliphatic carboxylic acid described above. On the other hand, the alcohol can be, for example, a saturated or unsaturated monohydric or polyhydric alcohol. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these, a monohydric or polyhydric saturated alcohol having 30 or less carbon atoms is preferred, and an aliphatic or alicyclic saturated monohydric alcohol or aliphatic saturated polyhydric alcohol having 30 or less carbon atoms is more preferred.

[0053] Specific examples of such alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, and dipentaerythritol.

[0054] Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture containing myricyl palmitate as a main component), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate, glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

[0055] Examples of aliphatic hydrocarbons having a number average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomers having 3 to 12 carbon atoms. Note that the aliphatic hydrocarbons herein also include alicyclic hydrocarbons. The number average molecular weight of the aliphatic hydrocarbons is preferably 5,000 or less. Among these, paraffin wax, polyethylene wax, or a partial oxide of polyethylene wax is preferred, and paraffin wax and polyethylene wax are more preferred.

[0056] For details about the release agent, please refer to paragraphs 0055 to 0061 of JP 2018-095706 A, the contents of which are incorporated herein by reference.

[0057] When the resin composition of the present embodiment contains a release agent, the content thereof in the resin composition is preferably 0.03 to 3 mass %, more preferably 0.05 to 0.8 mass %, and even more preferably 0.05 to 0.6 mass %. The resin composition of the present embodiment may contain only one type of release agent, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0058] <Other ingredients> The resin composition of the present embodiment may contain other components as needed, as long as the desired physical properties are not significantly impaired. Examples of the other components include fillers, resin components other than those described above, such as the polycarbonate resin (A), and various resin additives. Examples of resin additives include reactive compounds, ultraviolet absorbers, colorants (dyes, pigments), antistatic agents, flame retardant assistants, antifogging agents, antiblocking agents, flow improvers, plasticizers, dispersants, antibacterial agents, etc. One type of resin additive may be contained, or two or more types may be contained in any combination and ratio. In the resin composition of this embodiment, the polycarbonate resin (A) and the phosphate ester-based flame retardant (B) preferably account for 85% by mass or more of the resin composition in total, more preferably 90% by mass or more, and even more preferably 92% by mass or more. Furthermore, the total of the polycarbonate resin (A), the phosphate ester flame retardant (B), and the anti-dripping agent (C), the core-shell elastomer (D), the graft copolymer (E), the stabilizer, and the release agent, which are blended as needed, preferably accounts for 95% by mass or more of the resin composition, more preferably 97% by mass or more, and even more preferably 99% by mass or more. In the resin composition of this embodiment, the content of the silicate mineral is preferably 0 to 20 parts by mass, more preferably 0 to 15 parts by mass, even more preferably 0 to 10 parts by mass, still more preferably 0 to 5 parts by mass, and even more preferably 0 to 1 part by mass, relative to 100 parts by mass of the polycarbonate resin (A). By adopting such a configuration, the impact resistance of the resulting molded article tends to be further improved. An example of a silicate mineral is talc.

[0059] <Physical properties of resin composition> The resin composition of the present embodiment preferably has excellent fluidity. Specifically, the melt mass flow rate (MFR) of the resin composition at 300°C under a load of 1.2 kg is preferably 21 g / 10 min or more, more preferably 23 g / 10 min or more, even more preferably 25 g / 10 min or more, and even more preferably 29 g / 10 min or more, and is preferably 70 g / 10 min or less, more preferably 65 g / 10 min or less, and may be 45 g / 10 min or less. The resin composition of this embodiment also preferably has excellent fluidity after wet heat. Specifically, after the resin composition is left to stand for 250 hours in an atmosphere of 60°C and 90% relative humidity, the rate of change in melt mass flow rate (MFR) at 300°C under a load of 1.2 kg is preferably 120% or less, more preferably 119% or less, and even more preferably 117% or less. The lower limit of the rate of change is ideally 100%, but practically 101% or more.

[0060] In addition, the resin composition of the present embodiment preferably has excellent flame retardancy. Specifically, it is preferable that the flame retardancy satisfies V-0 when measured in accordance with the UL-94 standard using a test piece having a thickness of 0.8 mm formed from the resin composition. The MFR, the rate of change in MFR after wet heat, and the flame retardancy are measured according to the method described in the examples below.

[0061] <Method of manufacturing resin composition> The method for producing the resin composition of this embodiment is not limited, and a wide variety of known methods for producing resin compositions can be used. For example, the polycarbonate resin (A), the phosphate ester-based flame retardant (B), and other components that are added as needed may be premixed using a mixer such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, a roll, a Brabender mixer, a single-screw kneading extruder, a twin-screw kneading extruder, or a kneader. The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0062] <Molded products> The molded article of this embodiment is formed from the resin composition or pellets of this embodiment. The resin composition of this embodiment can also be molded directly without first going through the pellet state. The resin composition (e.g., pellets) described above can be molded into a molded article by various molding methods. The shape of the molded article is not particularly limited and can be appropriately selected depending on the application and purpose of the molded article. Examples of the shape include film, rod, cylinder, ring, circle, ellipse, polygon, irregular shape, hollow, frame, box, panel, button, etc.

[0063] The method for molding the molded product is not particularly limited, and a conventionally known molding method can be adopted. For example, injection molding method, injection compression molding method, extrusion molding method, profile extrusion method, transfer molding method, blow molding method, gas assist blow molding method, blow molding method, extrusion blow molding, IMC (in-mold coating molding) molding method, rotational molding method, multilayer molding method, two-color molding method, insert molding method, sandwich molding method, foam molding method, pressure molding method, etc. can be mentioned. In particular, the resin composition of the present embodiment is suitable for molded products obtained by injection molding method, injection compression molding method, and extrusion molding method. However, it is needless to say that the resin composition of the present embodiment is not limited to molded products obtained by these methods.

[0064] The molded product of the present embodiment can be widely used for molded products containing polycarbonate resin. Specifically, it is preferably used for electric and electronic equipment / parts, OA equipment / parts, information terminal equipment / parts, machine parts, household appliances, vehicle parts, building members, various containers, leisure goods / groceries, lighting equipment, etc. In particular, it is preferably used for thin-walled molded products (for example, thin-walled molded products with a thickness of the thinnest part of 1 μm or more and 1 mm or less).

Examples

[0065] The present invention will be described more specifically with reference to the following examples. 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 etc. used in the examples are difficult to obtain due to obsolescence etc., measurements can be made using other instruments having equivalent performance.

[0066] [[ID=二十一]]1. Raw materials The raw materials shown in Table 1 below were used.

Table 1

[0067] <Synthesis example of B-2> 25 mol of 2,6-dimethylphenol, 12.5 mol of phosphoryl chloride, 0.2 mol of iron chloride, and 3 mol of orthoxylene were reacted at 160 °C for 8 hours while stirring. Then, the pressure was reduced to 350 torr to remove hydrogen chloride. Then, at 100 °C and normal pressure, 6.1 mol of resorcinol and 0.4 mol of aluminum chloride were added, and the reaction was carried out again at 160 °C for 5 hours while stirring. Then, the pressure was reduced again to 350 torr to remove hydrogen chloride and orthoxylene. The obtained mixture was washed with hydrochloric acid, and after removing the aqueous phase, it was further washed with an aqueous sodium hydroxide solution, and the aqueous phase was removed. The obtained organic phase was concentrated to obtain a flame retardant (B-2).

[0068] <Amount of Na ions in ICP-AES analysis> The sample was placed in a platinum dish, sulfuric acid was added, and it was heated to dryness. After gently heating with a burner, it was ashed in an electric furnace. After cooling, acid was added again and the heated solution was used as a measurement sample. Using the pretreated sample (flame retardant), ICP-AES analysis was performed with a plasma emission spectroscopic analyzer SPS-3100 type manufactured by SII NanoTechnology. The sample was placed in a platinum dish, sulfuric acid was added, and it was heated to dryness. After gently heating with a burner, it was ashed in an electric furnace. After cooling, the sample was prepared by adding acid again and heating.

[0069] 2. Examples 1 to 6, Comparative Examples 1 to 5 <Preparation of resin pellets> Each component shown in Table 1 was blended at the ratios shown in Table 3 or Table 4 (each component is in parts by mass), uniformly mixed with a tumbler mixer to prepare a mixture, and this mixture was supplied to a twin-screw extruder ("TEX30α" manufactured by Japan Steel Works), kneaded under the conditions of a screw rotation speed of 200 rpm, a discharge rate of 30 kg / h, and a barrel temperature of 280 °C, and extruded in a strand shape from the nozzle tip. The extrudate was rapidly cooled in a water tank and cut using a pelletizer to obtain pellets of the resin composition.

[0070] <Melt flow rate (MFR)> The MFR of the resin composition was measured at 300 °C and a load of 1.2 Kg according to ISO1133. The unit was shown as g / 10 min.

[0071] <Melt flow rate (MFR) change rate after moist heating> The resin composition was allowed to stand for 250 hours in an atmosphere of 60°C and 90% relative humidity, and then the MFR (unit: g / 10 min, wet heat MFR) was measured at 300°C and a load of 1.2 kg according to ISO1133 in the same manner as above. The rate of change was expressed as [(MFR after moist heat - initial MFR) / initial MFR] x 100 (unit: %).

[0072] <Flammability> The pellets of the resin composition obtained above were injection molded using an injection molding machine ("SE100DUZ" manufactured by Sumitomo Heavy Industries, Ltd.) under conditions of a resin temperature of 265°C and a mold temperature of 70°C, to obtain a test piece for UL testing measuring 127 mm in length, 12.7 mm in width, and 0.8 mm in thickness. The obtained UL test specimens were conditioned for 48 hours in a temperature-controlled room at 23°C and a relative humidity of 50%, and then tested in accordance with the UL94 test (combustion test for plastic materials for equipment parts) established by Underwriters Laboratories (UL) of the United States. The UL94 test is a method of evaluating flame retardancy based on the afterflame time and drip rate after a burner flame is applied to a test piece held vertically for 10 seconds. To achieve flame retardancy of V-0, V-1, or V-2, the material must meet the standards shown in Table 2 below.

[0073] [Table 2]

[0074] [Table 3]

[0075] [Table 4]

[0076] In the above table, "Na concentration" indicates the amount of Na ions in the phosphate ester flame retardant (B) as determined by ICP-AES analysis, and the unit is ppm by mass. The unit of MFR is g / 10 min. Regarding flame retardancy, if V-2 is not satisfied, it is indicated as NR (not rated). As is clear from the above results, the resin compositions of the present invention were excellent in fluidity, fluidity after moist heat treatment, and flame retardancy (Examples 1 to 6).

Claims

1. The composition contains 6.5 parts by mass or more and 30 parts by mass or less of a phosphate ester-based flame retardant (B) relative to 100 parts by mass of the polycarbonate resin (A), The resin composition, wherein the phosphate ester-based flame retardant (B) has a Na ion amount of more than 0 ppm and not more than 30 ppm as measured by ICP-AES analysis.

2. The resin composition according to claim 1, wherein the phosphate ester-based flame retardant (B) is a phosphate ester represented by formula (P): Formula (P) 【Chemical 1】 (In formula (P), k is an integer of 0 to 5, and a mixture of compounds having different k values ​​may be used. In the case of a mixture of phosphate esters having different k values, k is the average value of the mixture. X １ represents a divalent arylene group, p, q, r, and s each independently represent 0 or 1, and R 11 , R 12 , R 13 and R 14 each independently represents an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms.

3. The resin composition according to claim 1 or 2, further comprising an anti-dripping agent (C) in an amount of 0.1 part by mass or more and 1 part by mass or less per 100 parts by mass of the polycarbonate resin (A).

4. The resin composition according to claim 1 or 2, further comprising a core-shell elastomer (D) in an amount of 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the polycarbonate resin (A).

5. 3. The resin composition according to claim 1, comprising 10 parts by mass or more and 35 parts by mass or less of a graft copolymer (E) containing an aromatic vinyl monomer unit, a vinyl cyanide monomer unit, and a diene rubber polymer unit, per 100 parts by mass of the polycarbonate resin (A).

6. The phosphate ester-based flame retardant (B) is a phosphate ester represented by formula (P), Further, the composition contains an anti-dripping agent (C) in an amount of 0.1 parts by mass or more and 1 part by mass or less per 100 parts by mass of the polycarbonate resin (A), Further, the composition contains a core-shell elastomer (D) in an amount of 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the polycarbonate resin (A), 2. The resin composition according to claim 1, comprising 10 parts by mass or more and 35 parts by mass or less of a graft copolymer (E) containing an aromatic vinyl monomer unit, a vinyl cyanide monomer unit, and a diene rubber polymer unit per 100 parts by mass of the polycarbonate resin (A). Formula (P) 【Chemistry 2】 (In formula (P), k is an integer of 0 to 5, and a mixture of compounds having different k values ​​may be used. In the case of a mixture of phosphate esters having different k values, k is the average value of the mixture. X １ represents a divalent arylene group, p, q, r, and s each independently represent 0 or 1, and R 11 , R 12 , R 13 and R 14 each independently represents an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms.

7. Pellets of the resin composition according to claim 1, 2 or 6.

8. A molded article formed from the resin composition according to claim 1, 2 or 6.

Images