Flame-retardant polycarbonate resin composition

Abstract

To provide a flame-retardant polycarbonate resin composition having high flame retardance though an environmentally-kind material by clearing PFAS regulation.SOLUTION: A flame-retardant polycarbonate resin composition contains 0.04 to 0.7 pts.mass of an organic sulfonic acid-based flame retardant (B) having no fluorine atom to 100 pts.mass of a polycarbonate resin (A) containing 60 to 80 mass% of a linear aromatic polycarbonate resin (A1) having a viscosity-average molecular weight of 10,000 to 25,000, and 20 to 40 mass% of a linear aromatic polycarbonate resin (A2) having a viscosity-average molecular weight of 50,000 to 90,000.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a flame-retardant polycarbonate resin composition, and more particularly to a flame-retardant polycarbonate resin composition that satisfies PFAS regulations and is an environmentally friendly material, yet has high flame retardancy and excellent residence heat stability and moist heat resistance. [Background technology]

[0002] Polycarbonate resins are resins with excellent heat resistance, mechanical properties, and electrical characteristics, and are widely used, for example, as materials for manufacturing vehicle parts, electrical and electronic equipment parts, housing materials, and other industrial parts. In particular, flame-retardant polycarbonate resin compositions are suitably used as vehicle parts, electrical and electronic equipment parts such as personal computers, mobile phones, and battery cases, and parts for office automation and information equipment such as printers and copiers.

[0003] In recent years, there has been an increasing trend towards flame retardancy, and polycarbonate resins are now required to have a high level of flame retardancy, with many cases requiring V-0 products under the UL-94 test method. Halogen-based flame retardants and phosphorus-based flame retardants have been used to impart flame retardancy to polycarbonate resins. However, in order to achieve V-0 flame retardancy using phosphorus-based flame retardants, a relatively high addition rate is required, which tends to reduce the mechanical properties of polycarbonate resin materials. Flame retardancy using halogen-based bromine-based or chlorine-based flame retardants is being banned under stricter regulations due to the toxicity and environmental issues caused by the generation of harmful gases.

[0004] In particular, fluorine-based flame retardants, such as perfluoroalkane metal salts proposed in Patent Documents 1 and 2, can provide a high level of flame retardancy with a relatively small amount of compounding. Furthermore, by blending such a flame retardant together with polyfluoroethylene such as PTFE as an anti-dripping agent, dripping can be suppressed and flame retardancy can be further improved. However, in recent years, fluorine compounds have become subject to international regulations, led by Japan, Europe, and the United States, and PFAS restrictions on perfluoroalkyl and polyfluoroalkyl compounds are being implemented primarily in the EU and the United States, and polyfluoroethylene and other compounds are also being targeted. PFAS restrictions are becoming even stricter internationally. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 47-40445 [Patent Document 1] Japanese Patent Application Publication No. 49-88943 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, there is a strong demand for a highly functional flame-retardant polycarbonate resin composition that does not emit toxic gases during combustion, meets PFAS regulations, and is environmentally friendly. However, it is not easy to achieve a V-0 rating in the UL-94 test without using a non-halogen flame retardant or a non-phosphorus flame retardant, or without the combined use of polytetrafluoroethylene as a drip prevention agent. The present invention has been made in view of the above circumstances, and an object (object) of the present invention is to provide a polycarbonate resin composition that complies with PFAS regulations and exhibits environmentally friendly, highly functional flame retardancy. [Means for solving the problem]

[0007] As a result of extensive research conducted by the present inventors to achieve the above object, they discovered that the above object can be achieved by combining a linear aromatic polycarbonate resin having a viscosity average molecular weight of 10,000 to 25,000 with a linear aromatic polycarbonate resin having a viscosity average molecular weight of 50,000 to 90,000, and adding an organic sulfonic acid flame retardant having no fluorine atoms thereto, thereby completing the present invention. The present invention relates to the following flame-retardant polycarbonate resin composition and molded article.

[0008] 1. A flame-retardant polycarbonate resin composition comprising 100 parts by mass of a polycarbonate resin (A) containing 60 to 80% by mass of a linear aromatic polycarbonate resin (A1) having a viscosity-average molecular weight of 10,000 to 25,000 and 20 to 40% by mass of a linear aromatic polycarbonate resin (A2) having a viscosity-average molecular weight of 50,000 to 90,000, and 0.04 to 0.7 parts by mass of a fluorine-free organic sulfonic acid flame retardant (B). 2. The polycarbonate resin composition according to 1 above, which does not contain perfluoroalkyl compounds (PFAS) and has a fluorine content of less than 100 ppm by mass as measured by combustion ion chromatography. 3. A polycarbonate resin composition according to the above 1 or 2, which does not contain fluorine atoms. 4. The polycarbonate resin composition according to any one of 1 to 3 above, wherein the fluorine atom-free organic sulfonic acid flame retardant (B) is one or more of paratoluenesulfonic acid or a metal salt thereof, and phenylsulfonylbenzenesulfonic acid or a metal salt thereof. 5. The polycarbonate resin composition according to any one of the above 1 to 4, further comprising 0.1 to 2.0 parts by mass of a silicone flame retardant auxiliary (C) per 100 parts by mass of the total of the polycarbonate resins (A) and (B). 6. The polycarbonate resin composition according to any one of 1 to 5 above, which has a UL-94 value of V-0 at a thickness of 2.0 mm. 7. Pellets of the polycarbonate resin composition according to any one of 1 to 6 above. 8. A molded article made from the polycarbonate resin composition according to any one of 1 to 6 above. 9. A molded product of the pellets described in 7 above. [Effects of the Invention]

[0009] The polycarbonate resin composition of the present invention clears PFAS regulations and is an environmentally friendly material, while also possessing high flame retardancy, excellent retention heat stability, and moist heat resistance. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below with reference to embodiments and examples. In this specification, unless otherwise specified, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit.

[0011] The flame-retardant polycarbonate resin composition of the present invention is characterized by containing 0.04 to 0.7 parts by mass of a fluorine-free organic sulfonic acid flame retardant (B) per 100 parts by mass of polycarbonate resin (A) containing 60 to 80% by mass of a linear aromatic polycarbonate resin (A1) having a viscosity-average molecular weight of 10,000 to 25,000 and 20 to 40% by mass of a linear aromatic polycarbonate resin (A2) having a viscosity-average molecular weight of 50,000 to 90,000.

[0012] [Polycarbonate resin (A)] The polycarbonate resin (A) of the component (A) of the present invention contains a linear aromatic polycarbonate resin (A1) and a linear aromatic polycarbonate resin (A2).

[0013] <Linear aromatic polycarbonate resin (A1)> The aromatic polycarbonate resin (A1) is a linear aromatic polycarbonate resin having a viscosity average molecular weight (Mv) of 10,000 to 25,000. The viscosity average molecular weight (Mv) is preferably 11,000 or more, more preferably 12,000 or more, and particularly preferably 13,000 or more, and is preferably 24,000 or less, and more preferably 23,000 or less. The aromatic polycarbonate resin (A1) may be one type, or two or more types may be mixed together. When two or more types with different Mv are mixed together, it is preferable to mix polycarbonate resins with Mvs within the above range, but it is also possible to add polycarbonate resins with Mvs outside the above range (excluding polycarbonate resin (A2) with Mvs of 50,000 or more) to adjust the Mv to within the above range. However, when a polycarbonate resin with Mv outside the above range is added, its amount is preferably less than 15% by mass, more preferably less than 10%, less than 7%, less than 5%, and particularly preferably less than 3% by mass, based on 100% by mass of the aromatic polycarbonate resin (A1).

[0014] [Linear aromatic polycarbonate resin (A2)] The aromatic polycarbonate resin (A2) is a linear aromatic polycarbonate resin having a viscosity average molecular weight of 50,000 to 90,000. The viscosity average molecular weight (Mv) of the polycarbonate resin (A2) is preferably 55,000 or more, more preferably 60,000 or more, of which 61,000 or more, particularly preferably 62,000 or more, and is also preferably 88,000 or less, of which 86,000 or less, 85,000 or less, 83,000 or less, 82,000 or less, 81,000 or less, particularly preferably 80,000 or less. The polycarbonate resin (A2) may be one type, or two or more types may be mixed and used. When two or more types are mixed, it is preferable to mix polycarbonate resins having an Mv within the above range. However, when two or more types with different Mv are mixed, it is also possible to add a polycarbonate resin having an Mv outside the above range (excluding polycarbonate resin (A1) with an Mv of 25,000 or less) and adjust the Mv to be within the above range. However, when a polycarbonate resin having an Mv outside the above range is added, its amount is preferably less than 15% by mass, more preferably less than 10%, less than 7%, less than 5%, and particularly preferably less than 3% by mass, based on 100% by mass of the polycarbonate resin (A2).

[0015] 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 a temperature of 25°C, and then using the Schnell viscosity formula, i.e., η = 1.23 × 10 -4 Mv 0.83 The intrinsic viscosity [η] is the specific viscosity [η] at each solution concentration [C] (g / dl). sp ] is measured and calculated using the following formula:

number

[0016] The aromatic polycarbonate resins (A1) and (A2) are linear polycarbonate resins, but linear polycarbonate resins are polycarbonate resins obtained by interfacial polymerization of an aromatic dihydroxy compound and carbonyl chloride without using a branching agent. Polycarbonate resins obtained using a branching agent or by the melt method (ester interchange method) are branched and therefore do not fall under this category.

[0017] The polycarbonate resin (A) of the present invention contains a large amount of low-molecular-weight linear aromatic polycarbonate resin (A1) (60-80% by mass) and a small amount of high-molecular-weight linear aromatic polycarbonate resin (A2) (20-40% by mass), based on 100% by mass of the total of (A1) and (A2). This combination of amounts allows the resin composition to have good flame retardancy, residence heat stability, and flowability. The content of polycarbonate resin (A2) is preferably 21% by mass or more, more preferably 22% by mass or more, and preferably 38% by mass or less, more preferably 37% by mass or less.

[0018] The types of aromatic polycarbonate resins (A1) and (A2) are not particularly limited, and they are aromatic polycarbonate resins in which the carbons directly bonded to carbonate bonds are aromatic carbons.

[0019] Among the monomers that are raw materials for aromatic polycarbonate resins, examples of aromatic dihydroxy compounds include: dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol), and 1,4-dihydroxybenzene; dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, and 4,4'-dihydroxybiphenyl;

[0020] dihydroxynaphthalenes such as 2,2'-dihydroxy-1,1'-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, and 2,7-dihydroxynaphthalene;

[0021] dihydroxydiaryl ethers such as 2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene, and 1,3-bis(4-hydroxyphenoxy)benzene;

[0022] 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), 1,1-bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C), 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane, 1,1-bis(3-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane, α,α'-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)cyclohexylmethane, bis(4-hydroxyphenyl)phenylmethane, bis(4-hydroxyphenyl)(4-propenylphenyl)methane, bis(4-hydroxyphenyl)diphenylmethane, bis(4-hydroxyphenyl)naphthylmethane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-naphthylethane, 1,1-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 1,1-bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)hexane, 1,1-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxyphenyl)octane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(4-hydroxyphenyl)nonane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-bis(4-hydroxyphenyl)dodecane, Bis(hydroxyaryl)alkanes such as;

[0023] 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-4-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, 1,1-bis(4-hydroxyphenyl)-4-phenylcyclohexane, Bis(hydroxyaryl)cycloalkanes such as;

[0024] 9,9-bis(4-hydroxyphenyl)fluorene, Cardo structure-containing bisphenols such as 9,9-bis(4-hydroxy-3-methylphenyl)fluorene;

[0025] 4,4'-dihydroxydiphenyl sulfide, Dihydroxydiaryl sulfides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-dihydroxydiphenyl sulfone, dihydroxydiarylsulfones such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; etc.

[0026] Of these, bis(hydroxyaryl)alkanes are preferred, and bis(4-hydroxyphenyl)alkanes are particularly preferred. In particular, from the standpoints of impact resistance and heat resistance, 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A) and 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C) are preferred. The aromatic dihydroxy compounds may be used alone or in any combination of two or more in any ratio.

[0027] Among the monomers that are raw materials for polycarbonate resins, examples of carbonate precursors include carbonyl halides, etc. The carbonate precursors may be used alone or in any combination and ratio of two or more.

[0028] Specific examples of carbonyl halides include phosgene; haloformates such as bischloroformates of dihydroxy compounds and monochloroformates of dihydroxy compounds; and the like.

[0029] The polycarbonate resins (A1) and (A2) may be not only virgin materials but also polycarbonate resins recycled from used products (so-called material-recycled polycarbonate resins), and preferably contain both virgin materials and recycled resins, or may consist of recycled polycarbonate resins. The proportion of recycled polycarbonate resin in the polycarbonate resin (A) is preferably 40% or more, 50% or more, 60% or more, or 80% or more, and it is also preferable that the recycled polycarbonate resin is 100%.

[0030] [Fluorine-free organic sulfonic acid flame retardant (B)] The flame-retardant polycarbonate resin composition of the present invention contains an organic sulfonic acid flame retardant (B) that does not contain a fluorine atom.

[0031] As the organic sulfonic acid flame retardant having no fluorine atoms, a non-fluorine organic sulfonic acid or a metal salt thereof having no C—F bond in the molecule is preferred. The metal in the metal salt is preferably an alkali metal or alkaline earth metal, including alkali metals such as lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs); and alkaline earth metals such as magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba). Of these, sodium, potassium, and cesium are preferred, with sodium and potassium being particularly preferred.

[0032] Preferred examples of the fluorine-free organic sulfonic acid or metal salt thereof include aromatic sulfonic acid or metal salt thereof, aromatic sulfonamide (or sulfonimide) or metal salt thereof, and polystyrene sulfonic acid or metal salt thereof, and more preferred are these metal salts.

[0033] Specific examples thereof include alkali metal salts of aromatic sulfonic acids having at least one aromatic group in the molecule, such as potassium 3-(phenylsulfonyl)benzenesulfonate (i.e., potassium diphenylsulfone-3-sulfonate), dipotassium diphenylsulfone-3,3'-disulfonate, sodium benzenesulfonate, potassium benzenesulfonate, cesium benzenesulfonate, sodium paratoluenesulfonate, potassium paratoluenesulfonate, cesium paratoluenesulfonate, sodium dodecylbenzenesulfonate, potassium dodecylbenzenesulfonate, cesium dodecylbenzenesulfonate, potassium styrenesulfonate, sodium polystyrenesulfonate, potassium polystyrenesulfonate, and cesium polystyrenesulfonate; Examples include alkaline earth metal salts of aromatic sulfonic acids having at least one aromatic group in the molecule, such as magnesium paratoluenesulfonate, calcium paratoluenesulfonate, strontium paratoluenesulfonate, barium paratoluenesulfonate, magnesium dodecylbenzenesulfonate, and calcium dodecylbenzenesulfonate.

[0034] Examples of metal salts of aromatic sulfonamides (or sulfonimides) include potassium salts of N-(p-tolylsulfonyl)-p-toluenesulfonimide, potassium salts of N-(N'-benzylaminocarbonyl)sulfanilimide, and potassium salts of N-(phenylcarboxyl)-sulfanilimide.

[0035] Of the above-mentioned organic sulfonic acid flame retardants not containing fluorine atoms, paratoluenesulfonic acid or its metal salts, phenylsulfonylbenzenesulfonic acid or its metal salts, and polystyrenesulfonic acid or its metal salts are preferred, and among these, metal salts, particularly alkali metal salts, especially sodium salts or potassium salts are preferred. The fluorine-free organic sulfonic acid flame retardants may be used alone or in any combination of two or more in any ratio.

[0036] The content of the fluorine-free organic sulfonic acid flame retardant (B) is 0.04 to 0.7 parts by mass, preferably 0.05 parts by mass or more, more preferably 0.06 parts by mass or more, more preferably 0.07 parts by mass or more, and more preferably 0.60 parts by mass or less, more preferably 0.50 parts by mass or less, 0.40 parts by mass or less, 0.30 parts by mass or less, and particularly preferably 0.25 parts by mass or less. By combining such an amount with the polycarbonate resins (A1) and (A2) in the above-mentioned predetermined amounts, it is possible to obtain a flame-retardant polycarbonate resin composition that meets PFAS regulations and achieves V-0 flame retardancy with a low additive amount.

[0037] The flame-retardant polycarbonate resin composition of the present invention does not contain perfluoroalkyl compounds (PFAS), but the fluorine content measured by combustion ion chromatography is preferably less than 100 ppm by mass, more preferably less than 50 ppm by mass, even more preferably less than 30 ppm by mass, less than 20 ppm by mass, less than 10 ppm by mass, less than 5 ppm by mass, less than 3 ppm by mass, less than 2 ppm by mass, less than 1 ppm by mass, and particularly preferably 0 ppm by mass.

[0038] [Silicone-based flame retardant synergist (C)] The flame-retardant polycarbonate resin composition of the present invention preferably further contains a silicone-based flame-retardant auxiliary (C). As the silicone flame retardant aid (C), polyorganosiloxane is preferred. Among them, polyorganosiloxane having an aromatic group such as a phenyl group in the molecule is preferred. Examples of such polyorganosiloxane include polydiphenylsiloxane, polymethylphenylsiloxane, polydimethyldiphenylsiloxane, and phenyl-containing cyclic siloxane.

[0039] Furthermore, in addition to the organic groups described above, polyorganosiloxane may contain functional groups such as silanol groups, epoxy groups, alkoxy groups, hydrosilyl (SiH) groups, vinyl groups, etc. The inclusion of these special functional groups may improve the compatibility of polyorganosiloxane with polycarbonate resins and improve reactivity during combustion, thereby increasing flame retardancy. The silanol group content in the polyorganosiloxane is usually 1% by mass or more, preferably 2% by mass or more, more preferably 3% by mass or more, and particularly preferably 5% by mass or more, and is usually 10% by mass or less, preferably 9% by mass or less, more preferably 8% by mass or less, and particularly preferably 7.5% by mass or less. By setting the silanol group content within the above range, a high flame retardant effect tends to be obtained, and if the silanol group content is too high, the thermal stability and moist heat stability of the polycarbonate resin composition may be significantly reduced.

[0040] The polyorganosiloxane may contain alkoxy groups in addition to hydroxyl groups, but the amount thereof is preferably 10% by mass or less, because if the alkoxy group content exceeds 10% by mass, gelation is likely to occur, which may lead to a decrease in the mechanical properties of the polycarbonate resin composition.

[0041] The average molecular weight (weight average molecular weight, Mw) of the polyorganosiloxane may be appropriately selected, but is usually 350 or more, preferably 400 or more, more preferably 450 or more, particularly preferably 500 or more, and usually 300,000 or less, preferably 100,000 or less, more preferably 20,000 or less, particularly preferably 15,000 or less. Polyorganosiloxanes with a weight average molecular weight below the lower limit of the above range are difficult to produce, and the heat resistance of the polyorganosiloxane may be significantly reduced. Polyorganosiloxanes with a weight average molecular weight above the upper limit of the above range tend to have poor dispersibility, resulting in reduced flame retardancy and a decrease in the mechanical properties of the polycarbonate resin composition. The weight average molecular weight of polyorganosiloxane is usually measured by GPC (gel permeation chromatography).

[0042] The silicone flame retardant aid (C) is also preferably a graft copolymer containing polyorganosiloxane. It may be a modified polyorganosiloxane containing the above-mentioned polyorganosiloxane graft-copolymerized with other (co)polymers, such as polybutyl acrylate and butyl acrylate-styrene copolymer.

[0043] The silicone flame retardant auxiliary (C) may be used alone or in combination of two or more.

[0044] The content of the silicone-based flame retardant aid (C) is preferably 0.1 to 2.0 parts by mass per 100 parts by mass of the polycarbonate resin (A). Within this range, good char formation is achieved during combustion, and low heat generation and smoke emission are likely to occur. The content of the silicone-based flame retardant aid (C) is more preferably 0.2 parts by mass or more, even more preferably 0.3 parts by mass or more, and particularly preferably 0.4 parts by mass or more, and is more preferably 1.7 parts by mass or less, even more preferably 1.5 parts by mass or less, and particularly preferably 1.3 parts by mass or less.

[0045] [Release agent] The polycarbonate resin composition of the present invention preferably contains a mold release agent. Examples of the release agent include aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, and polysiloxane-based silicone oils.

[0046] 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, tetralinic acid, montanic acid, adipic acid, and azelaic acid.

[0047] 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 saturated monohydric alcohol or an aliphatic saturated polyhydric alcohol having 30 or less carbon atoms is more preferred. Here, the term "aliphatic" is used to include alicyclic compounds.

[0048] 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.

[0049] The ester may contain an aliphatic carboxylic acid and / or an alcohol as an impurity. The ester may be a pure substance or a mixture of multiple compounds. The aliphatic carboxylic acid and the alcohol that combine to form an ester may each be used alone or in any combination and ratio of two or more.

[0050] 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.

[0051] 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. Aliphatic hydrocarbons also include alicyclic hydrocarbons. These hydrocarbons may also be partially oxidized. Among these, paraffin wax, polyethylene wax, or a partial oxide of polyethylene wax is preferred, and paraffin wax and polyethylene wax are more preferred. The number average molecular weight of the aliphatic hydrocarbon is preferably 5,000 or less. The aliphatic hydrocarbon may be a single substance, but a mixture of substances with various constituent components and molecular weights can also be used as long as the main component is within the above range.

[0052] Examples of polysiloxane-based silicone oils include dimethyl silicone oil, methylphenyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone.

[0053] The above-mentioned release agents may be contained either alone or in any combination and ratio of two or more.

[0054] The content of the release agent is preferably 0.1 to 2 parts by mass, more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). If the content of the release agent is less than the lower limit of the above range, the release effect tends to be insufficient, whereas if it exceeds the upper limit of the above range, the hydrolysis resistance may decrease and mold contamination during injection molding may occur.

[0055] [Stabilizer] The polycarbonate resin composition of the present invention preferably contains a stabilizer, and the stabilizer is preferably a phosphorus-based stabilizer or a phenol-based stabilizer.

[0056] Any known phosphorus 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.

[0057] 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, and 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite. Examples of such organic phosphite compounds include "ADK STAB 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 168" manufactured by BASF. The phosphorus-based stabilizer may be contained either as one type or as two or more types in any combination and ratio.

[0058] The content of the phosphorus-based stabilizer is usually 0.001 part by mass or more, preferably 0.01 part by mass or more, more preferably 0.03 part by mass or more, and usually 1 part by mass or less, preferably 0.7 part by mass or less, more preferably 0.5 part by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). If the content of the phosphorus-based stabilizer is below the lower limit of the above range, the thermal stabilization effect may be insufficient, whereas if the content of the phosphorus-based stabilizer exceeds the upper limit of the above range, the effect may plateau and become uneconomical.

[0059] Examples of the phenolic stabilizer include hindered phenolic antioxidants. Specific examples thereof include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphate, 3,3',3",5,5',5"-hexa-tert-butyl-a,a',a"-(mesitylene-2,4,6- triyl)tri-p-cresol, 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.

[0060] 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 phenolic antioxidants include "Irganox 1010" and "Irganox 1076" manufactured by BASF, and "Adekastab AO-50" and "Adekastab AO-60" manufactured by ADEKA. The phenolic stabilizer may be contained in one kind or in any combination and ratio of two or more kinds.

[0061] The content of the phenolic stabilizer is usually 0.001 part by mass or more, preferably 0.01 part by mass or more, and usually 1 part by mass or less, preferably 0.5 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). By setting the content of the phenolic stabilizer to be equal to or more than the lower limit of the above range, the effect as a phenolic stabilizer can be sufficiently obtained, and by setting the content to be equal to or less than the upper limit of the above range, the effect does not plateau and is economical.

[0062] [UV absorber] The polycarbonate resin composition of the present invention also preferably contains an ultraviolet absorber. Examples of ultraviolet absorbers include inorganic ultraviolet absorbers such as cerium oxide and zinc oxide; and organic ultraviolet absorbers such as benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxanilide compounds, malonic acid ester compounds, and hindered amine compounds. Among these, organic ultraviolet absorbers are preferred, and benzotriazole compounds are more preferred. By selecting an organic ultraviolet absorber, the transparency and mechanical properties of the resin composition of the present invention can be improved.

[0063] Specific examples of the benzotriazole compound include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-[2'-hydroxy-3',5'-bis(α,α-dimethylbenzyl)phenyl]-benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chlorobenzotriazole, and 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chlorobenzotriazole. t-amyl)-benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol], etc., among which 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol] are preferred, and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole is particularly preferred.

[0064] Specific examples of the benzophenone compound include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-n-dodecyloxybenzophenone, bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane, 2,2'-dihydroxy-4-methoxybenzophenone, and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone.

[0065] Specific examples of the salicylate compound include phenyl salicylate, 4-tert-butylphenyl salicylate, and the like. Specific examples of the cyanoacrylate compound include ethyl-2-cyano-3,3-diphenylacrylate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, and the like. Specific examples of oxanilide compounds include 2-ethoxy-2'-ethyloxalinic acid bis-aniline. As the malonic acid ester compound, 2-(alkylidene)malonic acid esters are preferred, and 2-(1-arylalkylidene)malonic acid esters are more preferred.

[0066] When an ultraviolet absorber is contained, its content is usually 0.05 parts by mass or more, preferably 0.1 parts by mass or more, and usually 1 part by mass or less, preferably 0.5 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). If the content of the ultraviolet absorber is less than the lower limit of the above range, the effect of improving weather resistance and light resistance may be insufficient, whereas if the content of the ultraviolet absorber exceeds the upper limit of the above range, mold deposits or the like may occur, causing mold contamination. The ultraviolet absorber may be contained alone or in any combination and ratio of two or more kinds.

[0067] [Elastomer] The polycarbonate resin composition of the present invention also preferably contains an elastomer. The elastomer is preferably a graft rubber copolymer obtained by graft copolymerizing a rubber component with a monomer component copolymerizable therewith. Such a graft rubber copolymer may be produced by any of bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc., and the copolymerization method may be either single-stage grafting or multi-stage grafting.

[0068] The rubber component typically has a glass transition temperature of 0°C or lower, preferably -20°C or lower, and more preferably -30°C or lower. Specific examples of the rubber component include polybutadiene rubber, polyisoprene rubber, polyalkyl acrylate rubbers such as polybutyl acrylate, poly(2-ethylhexyl acrylate), and butyl acrylate-2-ethylhexyl acrylate copolymers, silicone rubbers such as organopolysiloxane rubber, butadiene-acrylic composite rubbers, IPN composite rubbers consisting of organopolysiloxane rubber and polyalkyl acrylate rubber, styrene-butadiene rubber, ethylene-α-olefin rubbers such as ethylene-propylene rubber, ethylene-butene rubber, and ethylene-octene rubber, ethylene-acrylic rubber, and fluororubber. These may be used alone or in combination. Among these, polybutadiene rubber, polyalkyl acrylate rubber, IPN type composite rubber consisting of organopolysiloxane rubber and polyalkyl acrylate rubber, and styrene-butadiene rubber are preferred in terms of mechanical properties and surface appearance.

[0069] Specific examples of the monomer component graft-copolymerizable with the rubber component include aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic acid ester compounds, (meth)acrylic acid compounds, epoxy group-containing (meth)acrylic acid ester compounds such as glycidyl (meth)acrylate; maleimide compounds such as maleimide, N-methylmaleimide, and N-phenylmaleimide; α,β-unsaturated carboxylic acid compounds such as maleic acid, phthalic acid, and itaconic acid, and their anhydrides (e.g., maleic anhydride). These monomer components may be used alone or in combination of two or more. Among these, aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic acid ester compounds, and (meth)acrylic acid compounds are preferred in terms of mechanical properties and surface appearance, and (meth)acrylic acid ester compounds are more preferred. Specific examples of (meth)acrylic acid ester compounds include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and octyl (meth)acrylate.

[0070] From the viewpoints of impact resistance and surface appearance, core / shell graft copolymer elastomers are preferred. Among these, core / shell graft copolymers are preferred, each consisting of a core layer made of at least one rubber component selected from polybutadiene-containing rubber, polybutyl acrylate-containing rubber, and an IPN-type composite rubber made of organopolysiloxane rubber and polyalkyl acrylate rubber, and a shell layer formed by copolymerizing a (meth)acrylic acid ester around the core. Core / shell elastomers with a butadiene-based rubber core are particularly preferred. The core / shell graft copolymer preferably contains 40% by mass or more of the rubber component, more preferably 60% by mass or more. Furthermore, the (meth)acrylic acid component is preferably 10% by mass or more.

[0071] Preferred specific examples of these core / shell type graft copolymers 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, etc. Such rubbery polymers may be used alone or in combination of two or more.

[0072] When the polycarbonate resin composition of the present invention contains the elastomer (D), it preferably contains the elastomer (D) in an amount of 0.01 to 10 parts by mass, particularly 1 to 10 parts by mass, and especially 2 to 8 parts by mass per 100 parts by mass of the polycarbonate resin (A).

[0073] [Additives, etc.] The polycarbonate resin composition of the present invention may contain additives other than those described above, such as fillers, fluorescent whitening agents, pigments, dyes, plasticizers, compatibilizers, etc. These additives may be contained alone or in combination of two or more.

[0074] Furthermore, the polycarbonate resin (A) may contain other resins. Examples of other resins include thermoplastic polyester resins such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate; styrene-based resins such as polystyrene resin, high impact polystyrene resin (HIPS), acrylonitrile-butadiene-styrene copolymer (ABS resin), and acrylonitrile-styrene copolymer (AS resin); polyolefin resins such as polyethylene resin and polypropylene resin; polyamide resin; polyimide resin; polyetherimide resin; polyurethane resin; polyphenylene ether resin; polyphenylene sulfide resin; polysulfone resin; and polymethacrylate resin. When a resin other than the polycarbonate resin (A) is contained, the content thereof is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 5 parts by mass or less, even more preferably 3 parts by mass or less, 2 parts by mass or less, and particularly preferably 1 part by mass or less, per 100 parts by mass of the polycarbonate resin (A).

[0075] [Flame-retardant polycarbonate resin composition] The flame-retardant polycarbonate resin composition of the present invention has a high level of flame retardancy, and can achieve V-0 in a 2.0 mm thick UL test piece in the UL-94 test.

[0076] The flame-retardant polycarbonate resin composition of the present invention can be molded into a molded article. The molding method for producing a molded article can be any molding method commonly used for polycarbonate resin compositions. Examples include injection molding, ultra-high speed injection molding, injection compression molding, two-color molding, gas-assisted hollow molding, molding using an insulated mold, molding using a rapidly heated mold, foam molding (including supercritical fluid), insert molding, IMC (in-mold coating molding), extrusion molding, sheet molding, thermoforming, rotational molding, laminate molding, press molding, and blow molding. Molding methods using a hot runner system can also be used. Among these, injection molding methods such as injection molding, ultra-high speed injection molding, and injection compression molding are preferred.

[0077] [Molded products] Examples of molded articles include parts for electrical and electronic equipment, office automation equipment, information terminal equipment, machine parts, home appliances, vehicle parts, building materials, various containers, leisure goods and miscellaneous goods, lighting equipment, etc. Among these, the molded articles are suitable for use in parts for electrical and electronic equipment, office automation equipment, information terminal equipment, home appliances, lighting equipment, etc., and are suitable for use in, for example, components for secondary battery devices used indoors or outdoors, battery packs, storage batteries for electric bicycles, etc., and components for housings used outdoors. [Example]

[0078] The present invention will be explained in more detail below by showing examples, but the present invention should not be construed as being limited to the following examples. The components used in the examples and comparative examples are as shown in Table 1 below.

[0079] [Table 1]

[0080] (Examples 1 to 17, Comparative Examples 1 to 10) <Method of manufacturing resin composition pellets> The above-mentioned components were blended in the proportions (parts by mass) shown in Table 2 below, mixed in a tumbler for 20 minutes, and then fed into a twin-screw extruder "TEX30α" equipped with one vent, manufactured by The Japan Steel Works, Ltd., and kneaded under conditions of a screw rotation speed of 200 rpm, a discharge rate of 30 kg / hr, and a barrel temperature of 310°C. The molten resin extruded in the form of strands was quenched in a water tank and pelletized using a pelletizer to obtain resin composition pellets.

[0081] <Flow value (Q value)> The flow value (Q value) of the resin composition pellets obtained above was measured by the method described in JIS K7210 Appendix C. The measurement was performed using a Shimadzu Flow Tester CFT-500EX with a die having a hole diameter of 1.0 mm and a length of 10 mm, at a test temperature of 277°C and a test force of 160 kg / cm. 2 The amount of molten resin discharged under the condition of a preheating time of 420 seconds (unit: cm 3 / sec) was measured.

[0082] <Flame retardancy rating: UL-94> The resin composition pellets obtained by the above manufacturing method were dried at 120°C for 4 hours, and then injection molded using an SE100DU injection molding machine manufactured by Sumitomo Heavy Industries, Ltd. under conditions of a cylinder temperature of 300°C, a mold temperature of 80°C, and a molding cycle of 40 seconds, to obtain a UL-94 test piece having a length of 125 mm, a width of 13 mm, and a thickness of 2.0 mm. The UL-94 test pieces (2.0mm thick) obtained above were tested in accordance with the UL-94 test (flammability test for plastic materials for equipment parts) established by Underwriters Laboratories (UL) in the U.S. Flammability results were rated V-0, V-1, V-2, and HB in descending order, with results that did not meet the standards being NG.

[0083] <Evaluation of retention heat stability> Furthermore, the resin composition pellets obtained by the above-mentioned manufacturing method were dried at 120°C for 5 hours, and then, in the manufacturing method of the UL-94 test piece, the residence temperature was adjusted to 320°C and the residence time to 10 minutes, and a molded product (125 mm × 13 mm × 2.0 mmt) was obtained. The Q value of this product was measured in the same manner as above ("Q value after retention molding"), and the difference between the "Q value after retention molding" and the "Q value" of the pellet measured above, i.e., ΔQ value = "Q value after retention molding" - [Q value] was calculated and used as an index for evaluating retention thermal stability. The larger the ΔQ value, the more the decomposition of the polycarbonate resin progresses, the more the fluidity of the resin increases due to thermal degradation during retention, and the worse the retention thermal stability.

[0084] The appearance of the molded article obtained by retention molding was visually observed and evaluated according to the following criteria A to C. A: No visible defects B: Slightly defective appearance C: Many defective areas are observed

[0085] <Evaluation of humidity and heat resistance> The resin composition pellets obtained by the above-mentioned manufacturing method were subjected to wet heat treatment (PCT treatment) for 100 hours in saturated steam (100% RH) at a temperature of 121°C at a pressure of 2 atm. The Q values ​​of the UL-94 test pieces before and after the PCT treatment were measured in the same manner as above ("Q value after PCT test"), and the difference in the "Q value" of the pellets measured above, i.e., ΔQ value = "Q value after PCT test" - [Q value] was calculated and used as an index for evaluating the humidity and heat resistance stability. The larger the ΔQ value, the worse the moisture and heat resistance stability.

[0086] <Measurement of fluorine content (unit: mass ppm)> The fluorine content in the resin composition was determined by combustion ion chromatography. Specifically, the polycarbonate resin composition pellets obtained above were heated in an argon atmosphere at 270°C for 10 minutes using an automatic sample combustion apparatus (Model AQF-100, manufactured by Mitsubishi Chemical Analytech Co., Ltd.), and the amount of generated F ions was determined using an ICS-90 (manufactured by Nippon Dionex Co., Ltd.). To calculate the content, a calibration curve created from a separately prepared standard substance was used. When no calibration peak was detected, it was below the detection limit (1 ppm) and is marked as "ND" (not detected) in Table 2 and subsequent tables. Resin compositions that do not contain PFAS compounds naturally have an ND rating.

[0087] The evaluation results are shown in Table 2 below. In the table, Actual n is Example n, and Relative n is Comparative Example n.

[0088] [Table 2]

[0089] [Table 3]

[0090] [Table 4] [Industrial Applicability]

[0091] The flame-retardant polycarbonate resin composition of the present invention is a polycarbonate resin material that meets PFAS regulations and is an environmentally friendly material, yet has high flame retardancy and is excellent in retention heat stability and moist heat resistance, making it suitable for use in a variety of molded products.

Claims

1. A flame-retardant polycarbonate resin composition comprising 0.04 to 0.7 parts by mass of a fluorine-free organic sulfonic acid flame retardant (B) per 100 parts by mass of a polycarbonate resin (A) containing 60 to 80% by mass of a linear aromatic polycarbonate resin (A1) having a viscosity-average molecular weight of 10,000 to 25,000 and 20 to 40% by mass of a linear aromatic polycarbonate resin (A2) having a viscosity-average molecular weight of 50,000 to 90,000.

2. 2. The polycarbonate resin composition according to claim 1, which contains no perfluoroalkyl compounds (PFAS) and has a fluorine content of less than 100 ppm by mass as measured by combustion ion chromatography.

3. 3. The polycarbonate resin composition according to claim 1, wherein the resin composition contains no fluorine atoms.

4. 3. The polycarbonate resin composition according to claim 1, wherein the fluorine-free organic sulfonic acid flame retardant (B) is one or more of paratoluenesulfonic acid or a metal salt thereof, and phenylsulfonylbenzenesulfonic acid or a metal salt thereof.

5. 3. The polycarbonate resin composition according to claim 1, further comprising a silicone-based flame retardant aid (C) in an amount of 0.1 to 2.0 parts by mass per 100 parts by mass of the total of the polycarbonate resins (A) and (B).

6. 3. The polycarbonate resin composition according to claim 1, which has a UL-94 rating of V-0 at a thickness of 2.0 mm.

7. 3. Pellets of the polycarbonate resin composition according to claim 1 or 2.

8. A molded article made from the polycarbonate resin composition according to claim 1 or 2.

9. A molded article made from the pellets according to claim 7.

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