Polycarbonate resin composition

Abstract

To provide a glass fiber reinforced polycarbonate resin composition excellent in transparency, flame resistance, rigidity, impact resistance, thermal resistance, and fluidity.SOLUTION: A polycarbonate resin composition contains 8 to 30 pts.mass of a phosphazene compound (B) and 10 to 60 pts.mass of a glass filler (C) based on 100 pts.mass of a polycarbonate resin (A), and does not contain a fluorine resin (D) or contains 0.1 pt.mass or less thereof. The polycarbonate resin (A) contains 5 mass% or more of a linear polycarbonate resin (A1) having a viscosity average molecular weight of 55000 or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a polycarbonate resin composition, and more particularly to a glass fiber reinforced polycarbonate resin composition having excellent transparency, high flame retardancy and excellent rigidity. [Background technology]

[0002] Polycarbonate resins are resins that have excellent heat resistance, mechanical properties, and electrical characteristics, and are widely used in fields such as various parts for electrical and electronic devices, automobile parts, housing-related materials, medical applications, and miscellaneous goods.

[0003] In recent years, for example, electronic and electrical devices have become smaller and thinner, and therefore materials that have high flame retardancy and excellent rigidity even when thin-walled are required. In order to increase the rigidity of polycarbonate resin, it is effective to blend a filler such as glass fiber, and in particular, glass fiber-reinforced polycarbonate resin compositions containing glass fillers are most effective in meeting the demand for thin-walled, high-rigidity products.

[0004] Glass fiber reinforced polycarbonate resins are sometimes required to have high transparency. To make the glass fiber reinforced polycarbonate resin transparent, it is necessary to select a flame retardant and an anti-dripping agent that do not impair the transparency of the resin composition.

[0005] Examples of flame retardants that make the polycarbonate resin composition transparent include organic phosphate flame retardants, organic sulfonic acid metal salts such as potassium perfluorobutanesulfonate, and phosphazene compounds.

[0006] Glass fiber reinforced polycarbonate resin compositions containing organic phosphate ester flame retardants have difficulty meeting the recent demand for high flame retardancy in thin walls. Increasing the amount of the additive to achieve high flame retardancy reduces impact resistance and heat resistance, and requires the use of an anti-dripping agent in combination. Furthermore, in the case of glass fiber reinforced polycarbonate resin compositions using organic metal sulfonates, it is difficult to achieve sufficient flame retardancy without the combined use of an anti-dripping agent such as a fluororesin.

[0007] It has also been proposed to incorporate a phosphazene compound as a flame retardant. Patent Document 1 proposes blending a phosphazene compound with a fluorine-containing anti-dripping agent. Patent Document 2, filed by the present applicant, describes a glass fiber-reinforced polycarbonate resin composition containing milled glass fiber, a phosphazene compound, and a fluoropolymer. When blending a phosphazene compound as a flame retardant for polycarbonate resin, it is necessary to use an anti-dripping agent in combination.

[0008] However, since fluororesins cause polycarbonate resins to become cloudy, there is a demand for highly rigid glass fiber-reinforced polycarbonate resin compositions that do not contain fluororesins, do not impair transparency, and have high flame retardancy even when thin-walled. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-001801 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-136749 Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in view of the above problems, and an object of the present invention is to provide a glass fiber reinforced polycarbonate resin composition which has excellent transparency, high flame retardancy and excellent rigidity. [Means for solving the problem]

[0011] As a result of extensive research conducted by the present inventors to develop such an excellent glass fiber-reinforced polycarbonate resin composition, it was found that a glass fiber-reinforced polycarbonate resin composition that solves the above-mentioned problems can be obtained by containing no fluororesin, or only a very small amount if any, and containing a specific amount or more of a linear polycarbonate resin having a viscosity average molecular weight of 50,000 or more and / or a specific amount of a branched polycarbonate resin together with a phosphazene compound, and thus the present invention was arrived at. The present invention relates to the following polycarbonate resin composition.

[0012] 1. A composition comprising 8 to 30 parts by mass of a phosphazene compound (B) and 10 to 60 parts by mass of a glass filler (C) relative to 100 parts by mass of a polycarbonate resin (A), and not containing a fluororesin (D), or if contained, the content is 0.1 part by mass or less; A polycarbonate resin composition characterized in that the polycarbonate resin (A) contains 5% by mass or more of a linear polycarbonate resin (A1) having a viscosity average molecular weight of 50,000 or more and / or 15% by mass or more of a branched polycarbonate resin (A2). 2. The polycarbonate resin composition according to 1 above, wherein the polycarbonate resin (A) contains more than 90% by mass of a polycarbonate resin derived from bisphenol A, based on 100% by mass of the total polycarbonate resin (A). 3. The polycarbonate resin composition according to 1 or 2 above, which contains 10 to 15 parts by mass of glass filler (C) per 100 parts by mass of polycarbonate resin (A), and has flame retardancy of UL-94 V-0 or V-1 at a thickness of 1.2 mm. 4. A polycarbonate resin composition according to any one of 1 to 3 above, which contains 10 to 25 parts by mass of the phosphazene compound (B) per 100 parts by mass of the polycarbonate resin (A), and has flame retardancy of UL-94 V-0 at a thickness of 1.0 mm. 5. The polycarbonate resin composition according to 1 or 2 above, which contains 15 to 60 parts by mass of glass filler (C) per 100 parts by mass of polycarbonate resin (A), and has flame retardancy of UL-94 V-0 at a thickness of 1.0 mm. [Effects of the Invention]

[0013] The polycarbonate resin composition of the present invention is a glass fiber reinforced polycarbonate resin composition having excellent transparency, high flame retardancy, and rigidity, and is also excellent in impact resistance, heat resistance, and flowability. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will be described in detail below by showing embodiments and examples, but the present invention should not be construed as being limited to the embodiments and examples shown below. 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.

[0015] The polycarbonate resin composition of the present invention comprises, per 100 parts by mass of a polycarbonate resin (A), 8 to 30 parts by mass of a phosphazene compound (B) and 10 to 60 parts by mass of a glass filler (C); the polycarbonate resin composition does not contain a fluororesin (D), or if it contains a fluororesin (D), the content is 0.1 part by mass or less; and the polycarbonate resin (A) contains 5% by mass or more of a linear polycarbonate resin (A1) having a viscosity-average molecular weight of 50,000 or more and / or 15% by mass or more of a branched polycarbonate resin (A2).

[0016] [Polycarbonate resin (A)] In the polycarbonate resin composition of the present invention, the polycarbonate resin (A) contains 5% by mass or more of a linear polycarbonate resin (A1) having a viscosity average molecular weight of 50,000 or more and / or 15% by mass or more of a branched polycarbonate resin (A2).

[0017] [Linear polycarbonate resin (A1)] The viscosity average molecular weight Mv of the polycarbonate resin (A1) is at least 50,000, preferably at least 55,000, more preferably at least 60,000, and preferably at most 90,000, more preferably at most 85,000, and even more preferably at most 80,000. When the viscosity average molecular weight Mv of the polycarbonate resin (A1) is within the above range, the resin composition can achieve flame retardancy, anti-dripping properties, and transparency without the need for a fluororesin.

[0018] In the present invention, the viscosity average molecular weight Mv of the polycarbonate resin is determined by measuring the intrinsic viscosity [η] (unit: dl / g) at a temperature of 25°C using methylene chloride as a solvent with an Ubbelohde viscometer, and then calculating the viscosity average molecular weight Mv using the Schnell viscosity formula, i.e., η = 1.23 × 10 -4 Mv 0.83 , and the intrinsic viscosity [η] is the specific viscosity [η] at each solution concentration [C] (g / dl). sp ] was measured and the value was calculated according to the following formula.

[0019]

number

[0020] The polycarbonate resin (A1) is a linear polycarbonate resin. In the present invention, the linear polycarbonate resin refers to a polycarbonate resin that does not substantially have a branched structure in the polycarbonate resin main chain, and is preferably a polycarbonate resin polymerized by interfacial polymerization without using a branching agent. In addition, in terms of the branched structure index N described below, N is near 1.0, preferably about 1.0 to 1.1, and more preferably 1.0 to 1.05.

[0021] When polycarbonate resin (A1) is contained, its content is 5% by mass or more, preferably 6% by mass or more, and preferably 50% by mass or less, and more preferably 40% by mass or less, 35% by mass or less, and particularly preferably 30% by mass or less, based on 100% by mass of polycarbonate resin (A). By being in such a range, the resin composition can have flame retardancy, anti-dripping properties, and excellent transparency without requiring a fluororesin.

[0022] [Branched polycarbonate resin (A2)] The branched polycarbonate resin (A2) is a polycarbonate resin having a branched structure. As a preferred example of a method for producing a branched polycarbonate resin, as described in JP-A-8-259687, JP-A-8-245782, etc., a polycarbonate resin having a branched structure can be obtained without using a branching agent by selecting catalyst conditions or production conditions when a dihydroxy compound and a carbonic acid diester are reacted by a melt transesterification method.

[0023] Another preferred method for producing the branched polycarbonate resin (A2) is to copolymerize a trifunctional or higher polyfunctional compound (branching agent) in addition to the dihydroxy compound and carbonate-forming compound, which are raw materials for the polycarbonate resin, by interfacial polymerization or melt transesterification.

[0024] Examples of trifunctional or higher polyfunctional compounds include polyhydroxy compounds such as 1,3,5-trihydroxybenzene (phloroglucin), 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptene-2,4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptane, 2,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptene-3, 1,3,5-tri(4-hydroxyphenyl)benzene, and 1,1,1-tri(4-hydroxyphenyl)ethane; 3,3-bis(4-hydroxyaryl)oxindole (i.e., isatin bisphenol), 5-chloroisatin, 5,7-dichloroisatin, and 5-bromoisatin. Among these, 1,1,1-tri(4-hydroxyphenyl)ethane is preferred.

[0025] The amount of the polyfunctional aromatic compound used is usually 0.01 mol% or more, preferably 0.1 mol% or more, and usually 10 mol% or less, preferably 3 mol% or less, based on the total amount of the dihydroxy compounds used as raw materials. One type of polyfunctional compound may be used, or two or more types may be used in any combination and ratio.

[0026] The branched polycarbonate resin (A2) has a structural viscosity index N of preferably 1.2 or more, more preferably 1.25 or more, even more preferably 1.28 or more, and preferably 2.0 or less, more preferably 1.9 or less.

[0027] The structural viscosity index N is an index used to evaluate the flow characteristics of a melt. Usually, the melting characteristics of polycarbonate resin are expressed by the formula: γ = a σ N where γ is the shear rate, a is a constant, σ is the stress, and N is the structural viscosity index. Then, as described in, for example, Japanese Patent Application Laid-Open No. 2005-232442, the above formula is derived, Logη a It can also be expressed as: = [(1-N) / N] × Logγ + C, where N is the structural viscosity index, γ is the shear rate, C is a constant, η a: represents apparent viscosity. As can be seen from this formula, γ and η in the low shear region have significantly different viscosity behaviors. a The N value can also be evaluated from

[0028] The viscosity average molecular weight Mv of the branched polycarbonate resin (A2) is not limited as long as it is less than 50,000, which is the lower limit of the viscosity average molecular weight Mv of the polycarbonate resin (A1), but is preferably 15,000 or more, more preferably 16,000 or more, and is preferably 45,000 or less, more preferably 40,000 or less, even more preferably 38,000 or less, and particularly preferably 37,000 or less.

[0029] When the branched polycarbonate resin (A2) is contained, its content is 15% by mass or more, preferably 17% by mass or more, and preferably 80% by mass or less, more preferably 70% by mass or less, based on 100% by mass of the polycarbonate resin (A). When the content is within such a range, the flame retardancy, anti-dripping properties, and transparency of the resin composition can be improved without requiring a fluororesin.

[0030] The polycarbonate resin (A) contains 5% by mass or more of a linear polycarbonate resin (A1) and / or 15% by mass or more of a branched polycarbonate resin (A2), with the remainder being a polycarbonate resin (A3) other than (A1) and (A2). The polycarbonate resin (A3) is a linear polycarbonate resin having a viscosity average molecular weight Mv of less than 50,000. The polycarbonate resin (A3) is preferably a polycarbonate resin polymerized by interfacial polymerization without using a branching agent, and has a branched structure index N of preferably about 1.0 to 1.1, more preferably 1.0 to 1.05.

[0031] The viscosity average molecular weight Mv of the polycarbonate resin (A3) is preferably at least 14,000, more preferably at least 15,000, and is preferably at most 45,000, more preferably at most 40,000, even more preferably at most 38,000, and particularly preferably at most 37,000. When the viscosity average molecular weight Mv is within such a range, the resin composition can have good fluidity (moldability), impact resistance, strength, and heat resistance.

[0032] The content of the polycarbonate resin (A3) is 5% by mass or more, preferably 10% by mass or more, more preferably 15% by mass or more, of which 20% by mass or more, particularly 23% by mass or more, based on 100% by mass of the polycarbonate resin (A), and is preferably 95% by mass or less, more preferably 90% by mass or less, of which 85% by mass or less, particularly preferably 83% by mass or less. By being in such a range, the flowability (moldability), impact resistance, strength, and heat resistance of the resin composition can be improved without the need for a fluororesin.

[0033] There is no limitation on the type of polycarbonate resins (A1), (A2) and (A3), but aromatic polycarbonate resins are preferred from the viewpoints of heat resistance, mechanical properties, electrical properties and the like.

[0034] Among the monomers used as 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; 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; 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;

[0035] 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), 1,1-bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 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;

[0036] 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)-3-phenylcyclohexane, 1,1-bis(4-hydroxyphenyl)-4-phenylcyclohexane, Bis(hydroxyaryl)cycloalkanes such as;

[0037] 9,9-bis(4-hydroxyphenyl)fluorene, Cardo structure-containing bisphenols such as 9,9-bis(4-hydroxy-3-methylphenyl)fluorene; 4,4'-dihydroxydiphenyl sulfide, Dihydroxydiaryl sulfides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; 4,4'-dihydroxydiphenyl sulfoxide, Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-dihydroxydiphenyl sulfone, dihydroxydiarylsulfones such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; etc.

[0038] The aromatic dihydroxy compounds may be used alone or in any combination of two or more in any ratio.

[0039] Of these, bis(hydroxyaryl)alkanes are preferred, and bis(4-hydroxyphenyl)alkanes are particularly preferred, with 2,2-bis(4-hydroxyphenyl)propane, ie, bisphenol A, being particularly preferred from the standpoint of impact resistance and heat resistance. In the present invention, the polycarbonate resins (A1), (A2), and (A3) are preferably aromatic polycarbonate resins derived from bisphenol A, and the polycarbonate resin (A) preferably contains more than 90 mass% of bisphenol A-derived polycarbonate resins relative to 100 mass% of the total polycarbonate resin (A).

[0040] Among the monomers serving as raw materials for aromatic polycarbonate resins, examples of carbonate precursors include carbonyl halides, carbonate esters, etc. The carbonate precursors may be used alone or in any combination and ratio of two or more.

[0041] Specific examples of carbonyl halides include phosgene; haloformates such as bischloroformates of dihydroxy compounds and monochloroformates of dihydroxy compounds; and the like.

[0042] Specific examples of carbonate esters include diaryl carbonates such as diphenyl carbonate and ditolyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; biscarbonates of dihydroxy compounds, monocarbonates of dihydroxy compounds, and carbonates of dihydroxy compounds such as cyclic carbonates.

[0043] <Manufacturing method of polycarbonate resin> The method for producing the polycarbonate resins (A1), (A2), and (A3) is not particularly limited, and any known method can be used. Examples include interfacial polymerization, melt transesterification, the pyridine method, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among these, interfacial polymerization and melt transesterification are preferred. As mentioned above, the polycarbonate resin (A1) is preferably produced by interfacial polymerization, and the polycarbonate resin (A2) is preferably produced by interfacial polymerization in the presence of a branching agent or melt transesterification.

[0044] [Phosphazene compound (B)] The phosphazene compound (B) contained in the polycarbonate resin composition of the present invention is preferably a phosphazene compound represented by the following general formulas (1) and (2).

[0045] [ka] [ka]

[0046] Examples of the phosphazene compounds represented by the general formulas (1) and (2) include cyclic and / or chain C phosphazenes such as phenoxyphosphazene, (poly)tolyloxyphosphazene (e.g., o-tolyloxyphosphazene, m-tolyloxyphosphazene, p-tolyloxyphosphazene, o,m-tolyloxyphosphazene, o,p-tolyloxyphosphazene, m,p-tolyloxyphosphazene, o,m,p-tolyloxyphosphazene, etc.), and (poly)xylyloxyphosphazene. 1-6 Alkyl C 6-20 Cyclic and / or chain C phosphazenes such as aryloxyphosphazenes, (poly)phenoxytolyloxyphosphazenes (e.g., phenoxy o-tolyloxyphosphazene, phenoxy m-tolyloxyphosphazene, phenoxy p-tolyloxyphosphazene, phenoxy o,m-tolyloxyphosphazene, phenoxy o,p-tolyloxyphosphazene, phenoxy m,p-tolyloxyphosphazene, phenoxy o,m,p-tolyloxyphosphazene, etc.), (poly)phenoxyxylyloxyphosphazene, and (poly)phenoxytolyloxyxylyloxyphosphazene. 6-20 Aryl C 1-10 Alkyl C 6-20 Examples include aryloxyphosphazenes. Among these, cyclic and / or chain phenoxyphosphazenes, cyclic and / or chain C 1-3 Alkyl C 6-20 Aryloxyphosphazene, C 6-20 Aryloxy C 1-3 Alkyl C 6-20 Aryloxyphosphazenes (for example, cyclic and / or chain tolyloxyphosphazene, cyclic and / or chain phenoxytolylphenoxyphosphazene, etc.).

[0047] The cyclic phosphazene compound represented by the general formula (1) includes R1 and R 2 may be the same or different and represent an aryl group or an alkylaryl group. Examples of such an aryl group or alkylaryl group include a phenyl group, a naphthyl group, a methylphenyl group, a benzyl group, etc., among which R 1 and R 2 Cyclic phenoxyphosphazenes in which is a phenyl group are particularly preferred. Examples of such cyclic phenoxyphosphazene compounds include compounds such as phenoxycyclotriphosphazene, octaphenoxycyclotetraphosphazene, and decafenoxycyclopentaphosphazene, which are obtained by isolating cyclic chlorophosphazenes such as hexachlorocyclotriphosphazene, octachlorocyclotetraphosphazene, and decachlorocyclopentaphosphazene from a mixture of cyclic and linear chlorophosphazenes obtained by reacting ammonium chloride with phosphorus pentachloride at a temperature of 120 to 130°C, and then substituting the cyclic chlorophosphazenes with phenoxy groups.

[0048] In general formula (1), a represents an integer of 3 to 25, and among these, compounds in which a is an integer of 3 to 8 are preferred, and a mixture of compounds with different a's may also be used. Among these, a mixture of compounds in which a=3 is 50% by mass or more, a=4 is 10 to 40% by mass, and a=5 or more is 30% by mass or less in total is preferred.

[0049] In general formula (2), R 3 and R 4 may be the same or different and represent an aryl group or an alkylaryl group. Examples of such an aryl group or alkylaryl group include a phenyl group, a naphthyl group, a methylphenyl group, and a benzyl group. 3 and R 4 A chain phenoxyphosphazene in which is a phenyl group is particularly preferred. Examples of such chain phenoxyphosphazene compounds include compounds obtained by ring-opening polymerization of hexachlorocyclotriphosphazene obtained by the above method at a temperature of 220 to 250°C, and substituting the resulting linear dichlorophosphazene having a degree of polymerization of 3 to 10,000 with a phenoxy group.

[0050] Also, R 5 is -N=P(OR 3 ) 3 groups, -N=P(OR 4 ) 3 groups, -N=P(O)OR 3 Group, -N=P(O)OR 4 R represents at least one selected from the group 6 is -P(OR 3 ) 4 groups, -P(OR 4 ) 4 groups, -P(O)(OR 3 ) 2 groups, -P(O)(OR 4 ) represents at least one selected from the following two groups.

[0051] In general formula (2), b represents an integer of 3 to 10,000, preferably 3 to 1,000, more preferably 3 to 100, and even more preferably 3 to 25.

[0052] The phosphazene compound (B) may be a crosslinked phosphazene compound in which a portion of the phosphazene compound is crosslinked. The presence of such a crosslinked structure tends to improve heat resistance. Examples of such a crosslinked phosphazene compound include a crosslinked structure represented by the following general formula (3), for example, a compound having a crosslinked structure of 4,4'-diphenylene group, such as a compound having a crosslinked structure of 4,4'-sulfonyldiphenylene (i.e., bisphenol S residue), a compound having a crosslinked structure of 2,2-(4,4'-diphenylene)isopropylidene group, a compound having a crosslinked structure of 4,4'-oxydiphenylene group, or a compound having a crosslinked structure of 4,4'-thiodiphenylene group.

[0053] [ka] [In formula (3), X is —C(CH)—, —SO—, —S—, or —O—, and v is 0 or 1.]

[0054] The crosslinked phosphazene compound is a compound represented by the general formula (1) in which R 1 and R 2 a bridged phenoxyphosphazene compound in which a cyclic phenoxyphosphazene compound in which R is a phenyl group is bridged by a bridge group represented by the general formula (3), or 3 and R 4 A bridged phenoxyphosphazene compound obtained by crosslinking a chain phenoxyphosphazene compound in which R is a phenyl group with a crosslinking group represented by the above general formula (3) is preferred from the viewpoint of flame retardancy, and a bridged phenoxyphosphazene compound obtained by crosslinking a cyclic phenoxyphosphazene compound with a crosslinking group represented by the above general formula (3) is more preferred.

[0055] The content of phenylene groups in the crosslinked phenoxyphosphazene compound is usually 50 to 99.9%, preferably 70 to 90%, based on the total number of phenyl groups and phenylene groups in the cyclic phosphazene compound represented by general formula (1) and / or the chain phenoxyphosphazene compound represented by general formula (2). It is particularly preferred that the crosslinked phenoxyphosphazene compound is a compound having no free hydroxyl groups in its molecule.

[0056] In the present invention, the phosphazene compound (B) is preferably a cyclic phenoxyphosphazene compound represented by the general formula (1) above, or a crosslinked phenoxyphosphazene compound obtained by crosslinking the cyclic phenoxyphosphazene compound represented by the general formula (1) above with a crosslinking group, from the viewpoints of flame retardancy and mechanical properties.

[0057] The content of the phosphazene compound (B) is 8 to 30 parts by mass, preferably 9 parts by mass or more, more preferably 10 parts by mass or more, even more preferably 11 parts by mass or more, of which 12 parts by mass or more, and preferably 28 parts by mass or less, even more preferably 25 parts by mass or less, of which 24 parts by mass or less, 22 parts by mass or less, 20 parts by mass or less, 18 parts by mass or less, and particularly preferably 17 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). By including the phosphazene compound in such an amount, flame retardancy, transparency, and high heat resistance can be exhibited.

[0058] Glass Filler The form of the glass filler (C) used in the present invention is not particularly limited, and various forms such as glass fiber, glass powder, glass flake, milled fiber, glass beads, etc. can be used, and these may be used alone or in combination of two or more. Among these, from the viewpoint of transparency and reinforcing effect, it is preferable to use glass fiber or glass flake, and it is particularly preferable to use glass fiber.

[0059] Although alkali-free glass (E glass) may be used as the glass filler (C), it is more preferable that the refractive index of the glass filler (C) is close to that of the polycarbonate resin (A). Specifically, the refractive index at 589 nm is preferably 1.565 to 1.605, more preferably 1.570 to 1.600, and even more preferably 1.575 to 1.595. When the refractive index of the glass filler (C) is within this range, the transparency of the resin composition can be further improved and the haze can be further reduced.

[0060] The average fiber length of the glass fibers is not particularly limited, but is preferably selected from the range of 0.1 to 20 mm, more preferably 0.3 to 5 mm. When the average fiber length is in this range, the reinforcing effect is more sufficient and the polycarbonate resin composition can be easily molded. The average fiber diameter of the glass fibers is not particularly limited, but is preferably selected from the range of, for example, 1 to 100 μm, more preferably 2 to 50 μm, even more preferably 3 to 30 μm, and particularly preferably 5 to 20 μm.

[0061] Glass fibers having a flat cross-sectional shape (a cross-section perpendicular to the fiber length direction of the glass fibers) are preferred over those having a circular cross-sectional shape (hereinafter also referred to as "flat cross-section glass fibers") because they have excellent orientation during molding, are excellent in improving dimensional stability, etc., and are also effective in improving the transparency of molded products.

[0062] Here, the cross-sectional shape of the glass fiber can be expressed by the oblateness, which is the ratio of the major axis to the minor axis (D2 / D1), where D2 is the major axis and D1 is the minor axis of the cross section perpendicular to the longitudinal direction of the fiber. The average oblateness of the glass fiber is preferably 1.5 to 8, and more preferably 3 to 8. The average value of the major diameter D2 of the cross section of the flat cross section glass fiber is usually 10 to 50 μm, preferably 15 to 40 μm, more preferably 20 to 35 μm, still more preferably 24 to 30 μm, and particularly preferably 25 to 30 μm. The cross-sectional shape of the flat cross-section glass fiber includes not only a flat shape (approximately rectangular) but also non-circular shapes such as an ellipse, a cocoon shape, a trefoil shape, and similar shapes, but a flat shape or an ellipse shape is preferred, and a flat shape is particularly preferred.

[0063] The ratio of the average fiber length to the average fiber diameter (aspect ratio) of the glass fibers is usually 2 to 1000, preferably 2.5 to 700, and more preferably 3 to 600. When the aspect ratio of the glass fibers is 2 or more, the effect of improving the mechanical strength is excellent, and when it is 1000 or less, warpage and anisotropy can be suppressed, and deterioration in the appearance of the molded article can be prevented.

[0064] The average fiber diameter (diameter) of glass fibers refers to the diameter of glass fibers with a circular cross section, but for glass fibers with other cross sections, it refers to the number-average fiber diameter (diameter) when the cross section is converted into a perfect circle of the same area. The average fiber length of glass fibers refers to the number-average length of the fibers in the longitudinal direction. The average fiber length and average fiber diameter of glass fibers can be determined by averaging the fiber lengths and diameters measured for approximately 100 randomly selected glass fibers through SEM (scanning electron microscope) observation, but for commercially available products, catalog values ​​can be used.

[0065] Glass flakes are typically scaly glass powders having an average particle size of 10 to 4000 μm, an average thickness of 0.1 to 10 μm, and an aspect ratio (ratio of average maximum diameter / average thickness) of about 2 to 1000. The glass flakes used in the present invention preferably have an average particle size of 2000 μm or less, particularly 100 to 1500 μm, an average thickness of 0.1 to 10 μm, particularly 0.4 to 6 μm, and an aspect ratio of 10 to 800, particularly 50 to 600.

[0066] The glass filler (C) may be surface-treated with a surface treatment agent such as a silane coupling agent to improve adhesion to the resin matrix and suppress decomposition of the polycarbonate resin (A). However, since many commercially available glass fibers and glass flakes are already surface-treated with a surface treatment agent, when a surface-treated product is used, it is not necessary to further use a surface treatment agent.

[0067] Any conventionally known surface treatment agent can be used, and specific examples thereof include silane coupling agents such as aminosilanes, epoxysilanes, allylsilanes, and vinylsilanes. Of these, aminosilane surface treatment agents are preferred, and specific examples thereof include γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-(2-aminoethyl)aminopropyltrimethoxysilane. Furthermore, preferred examples of the surface treatment agent include novolac-type epoxy resins, bisphenol A-type epoxy resins, etc. Among these, novolac-type epoxy resins are more preferred. The silane-based surface treatment agent and the epoxy resin may be used alone or in combination, and it is also preferable to use both in combination.

[0068] The content of the glass filler (C) is 10 to 60 parts by mass per 100 parts by mass of the polycarbonate resin (A). A preferred embodiment is 10 to 15 parts by mass, and another preferred embodiment is 15 to 60 parts by mass, with 20 to 50 parts by mass, 25 to 45 parts by mass, or 25 to 40 parts by mass being particularly preferred. By using an amount within this range, rigidity and other properties can be sufficiently improved, there is no deterioration in transparency or the appearance of the molded product, or in impact resistance due to surface lifting of the glass filler, and the resin composition can be easily melt-extruded (pelletized).

[0069] [Fluororesin (D)] The polycarbonate resin composition of the present invention does not contain a fluororesin (D), or if it contains one, the content is 0.1 part by mass or less, preferably 0.05 part by mass or less, more preferably 0.03 part by mass or less, even more preferably less than 0.01 part by mass, of which less than 0.005 part by mass, and particularly preferably less than 0.001 part by mass. Even if the polycarbonate resin composition of the present invention does not contain a fluororesin (D), or if it contains one, it contains only a trace amount of fluororesin (D), the melting properties of the resin composition make it possible to prevent dripping during combustion and to have excellent flame retardancy.

[0070] [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.

[0071] 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 2B 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.

[0072] 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. Specific 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.

[0073] 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, per 100 parts by mass of the polycarbonate resin (A). By including the phosphorus-based stabilizer in such an amount, a sufficient heat stabilizing effect can be exhibited.

[0074] 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.

[0075] 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.

[0076] 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, per 100 parts by mass of the polycarbonate resin (A). By including the phenolic stabilizer in such an amount, the effect as a stabilizer can be sufficiently obtained.

[0077] [Release agent] The polycarbonate resin composition of the present invention preferably contains a mold release agent (lubricant). Examples of the mold 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 even if it is a mixture of substances with various constituent components and molecular weights, it is preferable that the main component is within the above range.

[0084] Examples of polysiloxane-based silicone oils include dimethyl silicone oil, methylphenyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone oil.

[0085] The release agent may be contained either as one kind or as two or more kinds in any combination and ratio.

[0086] The content of the release agent is usually 0.001 part by mass or more, preferably 0.01 part by mass or more, and usually 2 parts by mass or less, preferably 1 part by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). By setting the content of the release agent to be equal to or more than the lower limit of the above range, sufficient releasability effect is easily obtained, and by setting the content of the release agent to be equal to or less than the upper limit of the above range, sufficient hydrolysis resistance is obtained and mold contamination during injection molding is less likely to occur.

[0087] [Other ingredients] The polycarbonate resin composition of the present invention may contain other components in addition to those described above, as necessary, as long as the desired physical properties are not significantly impaired. Examples of other components include resins other than polycarbonate resins, various resin additives, etc. The other components may be contained alone or in any combination and ratio of two or more.

[0088] <Other resins> Other resins include, for example, thermoplastic polyester resins such as polyethylene terephthalate resin, polytrimethylene terephthalate resin, and polybutylene terephthalate resin; styrene-based resins such as polystyrene resin, high-impact polystyrene resin (HIPS), and acrylonitrile-styrene copolymer (AS resin); and polymethacrylate resin.

[0089] When a resin other than the polycarbonate resin (A) is contained, the content thereof is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, even more preferably 3 parts by mass or less, even more preferably 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).

[0090] <Resin additives> Examples of resin additives include ultraviolet absorbers, dyes and pigments, antistatic agents, 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.

[0091] [Production of polycarbonate resin composition] There is no limitation on the method for producing the polycarbonate resin composition of the present invention, and a wide variety of known methods for producing polycarbonate resin compositions can be employed, including a method in which the polycarbonate resin (A), the phosphazene compound (B), and other components to be added as needed are premixed using various mixers such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, a roll, a Brabender, a single-screw kneading extruder, a twin-screw kneading extruder, a kneader, etc. It is preferable to side-feed the glass filler (C).

[0092] The glass fiber reinforced polycarbonate resin composition of the present invention has excellent flame retardancy, particularly when it is thin. Preferred embodiments of the present invention are as follows. A polycarbonate resin composition containing 10 to 15 parts by mass of a glass filler (C) per 100 parts by mass of a polycarbonate resin (A), and having flame retardancy of UL-94 V-0 or V-1 at a thickness of 1.2 mm. A polycarbonate resin composition containing 10 to 25 parts by mass of a phosphazene compound (B) relative to 100 parts by mass of a polycarbonate resin (A), and having flame retardancy of UL-94 V-0 at a thickness of 1.0 mm. A polycarbonate resin composition containing 15 to 60 parts by mass of a glass filler (C) relative to 100 parts by mass of a polycarbonate resin (A), and having flame retardancy of UL-94 V-0 at a thickness of 1.0 mm.

[0093] [Molded products] The polycarbonate resin composition of the present invention is molded into a molded article. The method for producing a molded article can be any molding method generally used for polycarbonate resin compositions. Examples include injection molding, ultra-high speed injection molding, injection compression molding, two-color molding, gas-assisted or other hollow molding, molding using a heat-insulating 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, lamination molding, press molding, blow molding, etc. Also, a molding method using a hot runner system can be used. Among these, injection molding methods such as injection molding, ultra-high speed injection molding, and injection compression molding are preferred.

[0094] Examples of molded articles include parts for electrical and electronic devices, office automation equipment, information terminal equipment, machine parts, camera equipment, automobile parts, home appliances, building materials, various containers, leisure goods and miscellaneous goods, lighting equipment, etc. The resin composition of the present invention has high rigidity, flame retardancy, and excellent transparency, and is therefore particularly suitable for parts and housings where it is required to be able to see inside. [Example]

[0095] 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.

[0096] The components used in the examples and comparative examples are as shown in Table 1 below.

[0097] [Table 1]

[0098] (Examples 1 to 20, Comparative Examples 1 to 6) <Production of Polycarbonate Resin Composition Pellets> Each component other than the glass filler (C) described in Table 1 was blended at the ratios (parts by mass) described in Table 3 below, and after mixing for 20 minutes in a tumbler, it was supplied from the upstream feeder to a twin-screw extruder (TEM26SX) manufactured by Shibaura Machine Co., Ltd. equipped with 1 vent. Further, the glass filler (C) was supplied from the middle of the barrel, from the upstream (hopper part) of the extruder, at a downstream position 3 / 5 of the barrel length L, and kneaded under the conditions of a rotation speed of 250 rpm, a discharge rate of 25 kg / hour, and a barrel temperature of 290°C. The molten resin extruded in a strand shape from the extruder was rapidly cooled in a water tank and pelletized using a pelletizer to obtain pellets of the polycarbonate resin composition. Regarding Comparative Example 2, since the vibration of the strand was large and it was difficult to take it out, pellets could not be obtained.

[0099] <Preparation of ISO multi-purpose test piece (4 mm)> After drying the resin composition pellets obtained above at 90°C for 5 hours, using an injection molding machine (NEX80III type) manufactured by Nissei Plastic Industrial Co., Ltd., injection molding was performed under the conditions of a cylinder set temperature of 280°C, a mold temperature of 70°C, an injection time of 2 seconds, and a molding cycle of 50 seconds to injection mold an ISO multi-purpose test piece (4 mm thick).

[0100] <Measurement of density> Using the ISO multi-purpose test piece obtained by the above method, in accordance with ISO1183, the density (unit: g / cm 3 ) was measured.

[0101] <Measurement of Charpy impact strength without notch> Using the ISO multi-purpose test piece obtained by the above method, in accordance with ISO179-1 and ISO179-2, the Charpy impact strength without notch (unit: kJ / m 2 ) was measured.

[0102] <Measurement of flexural strength and flexural modulus> Using the ISO multi-purpose test piece obtained by the above method, in accordance with ISO178, the flexural strength (unit: MPa) and flexural modulus (unit: MPa) were measured.

[0103] <Measurement of deflection temperature under load (DTUL)> Using the ISO multipurpose test specimen obtained by the above method, the deflection temperature under load (unit: °C) was measured under a load of 1.80 MPa in accordance with ISO75-1 and ISO75-2.

[0104] <Measurement of bar flow length> The pellets obtained in the examples and comparative examples were dried at 90°C for 5 hours, and then injection-molded into bar-flow molded articles with a width of 20 mm and a thickness of 2 mm using an NEX80III (clamping force 80 tons) manufactured by Nissei Plastic Industrial Co., Ltd. under the following conditions: cylinder temperature 300°C, mold temperature 70°C, injection pressure 150 MPa, and molding cycle 40 seconds. The flow length (unit: mm) of the molded articles was evaluated.

[0105] <Haze measurement> The pellets obtained by the above manufacturing method were dried at 90°C for 5 hours and then injection molded using an injection molding machine (SE50DUZ) manufactured by Sumitomo Heavy Industries, Ltd. under conditions of a cylinder temperature of 300°C and a mold temperature of 80°C to form flat plates with a length of 80 mm, a width of 40 mm, and a thickness of 1 mm. The mold used was an insulated mold equipped with 80mm x 40mm x 3mm zirconium oxide (ZrO2) plates on the surfaces of the fixed cavity and the movable cavity. The haze (%) of the flat plate obtained by the above method was measured using SH7000 manufactured by Nippon Denshoku Industries Co., Ltd. The smaller the haze, the better the transparency.

[0106] <1.2mm and 1.0mm UL test> The pellets obtained by the above-mentioned manufacturing method were dried at 90°C for 5 hours, and then injection molded using an injection molding machine (SE50DUZ type) manufactured by Sumitomo Heavy Industries, Ltd. under conditions of a cylinder temperature of 270°C and a mold temperature of 70°C to mold test specimens for UL testing with a length of 127 mm, a width of 12.7 mm, and a wall thickness of 1.0 mm or 1.2 mm. The resulting UL test specimens were conditioned for 48 hours in a temperature-controlled room at 23°C and 50% humidity, and subjected to the UL94 test (combustion test for plastic materials for equipment components) established by Underwriters Laboratories (UL) in the United States. UL94V is a method for evaluating flame retardancy based on the afterflame time and drip rate after a burner flame is applied to a test specimen of a specified size held vertically for 10 seconds. To achieve flame retardancy of V-0, V-1, or V-2, the materials must meet the criteria shown in Table 2 below.

[0107] [Table 2]

[0108] Here, afterflame time refers to the length of time the test specimen continues to burn with a flame after the ignition source is removed. Cotton ignition by dripping is determined by whether or not the cotton marker, located approximately 300 mm below the bottom of the test specimen, is ignited by dripping material from the test specimen. Furthermore, if even one of the five specimens did not meet the above criteria, it was deemed not to meet V-2 and was rated NR (not rated).

[0109] The above results are shown in Table 3-6 below. In the table, "Act n" represents "Example n" and "Comparative n" represents "Comparative Example n."

[0110] [Table 3]

[0111] [Table 4]

[0112] [Table 5]

[0113] [Table 6] [Industrial Applicability]

[0114] The polycarbonate resin composition of the present invention has high rigidity and excellent flame retardancy and transparency, and therefore can be suitably used widely in components for, for example, electrical and electronic devices, office automation equipment, information terminal devices, home appliances, lighting equipment, etc., and has extremely high industrial applicability.

Claims

1. the composition contains 8 to 30 parts by mass of a phosphazene compound (B) and 10 to 60 parts by mass of a glass filler (C) relative to 100 parts by mass of a polycarbonate resin (A), and does not contain a fluororesin (D), or if it contains a fluororesin (D), the content is 0.1 part by mass or less; A polycarbonate resin composition, characterized in that the polycarbonate resin (A) contains 5 mass % or more of a linear polycarbonate resin (A1) having a viscosity average molecular weight of 55,000 or more.

2. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin (A) further contains 15 mass% or more of a branched polycarbonate resin (A2).

3. 3. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin (A) contains more than 90% by mass of a polycarbonate resin derived from bisphenol A, based on 100% by mass of the total polycarbonate resin (A).

4. 4. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition contains 10 to 15 parts by mass of the glass filler (C) per 100 parts by mass of the polycarbonate resin (A), and has a flame retardancy of V-0 or V-1 according to UL-94 at a thickness of 1.2 mm.

5. 5. The polycarbonate resin composition according to claim 1, wherein the phosphazene compound (B) is contained in an amount of 10 to 25 parts by mass per 100 parts by mass of the polycarbonate resin (A), and the polycarbonate resin composition has a flame retardancy of V-0 according to UL-94 at a thickness of 1.0 mm.

6. 6. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition contains 15 to 60 parts by mass of the glass filler (C) per 100 parts by mass of the polycarbonate resin (A), and has flame retardancy of UL-94 V-0 at a thickness of 1.0 mm.

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