Polycarbonate resin composition

Abstract

A polycarbonate resin composition characterized by containing 0.0001 to 0.3 parts by mass of a triaryl phosphate ester (B) represented by general formula (1), 1 to 100 parts by mass of a fibrous filler (C), and at least one of the following (i) to (iv) in an amount indicated below, per 100 parts by mass of a polycarbonate resin (A). The present invention relates to a composition comprising (i) 0.0005 to 0.1 parts by mass of 2-4-di-tert-butylphenol, (ii) 0.0001 to 0.03 parts by mass of 2, 2-bis (4-hydroxyphenyl) propane, (iii) 0.0005 to 0.05 parts by mass of 4-tert-butylphenol, (iv) 0.001 to 0.05 parts by mass of cumylphenol, and a method for preparing the same.

Description

Technical Field

[0001] This invention relates to polycarbonate resin compositions, and more particularly to polycarbonate resin compositions and molded articles thereof having excellent flexural strength and impact resistance. Background Technology

[0002] Polycarbonate resins have excellent mechanical properties, such as impact resistance, and are also excellent in terms of heat resistance and transparency. Therefore, they are used in many applications such as various optical components, electrical and electronic equipment components, automotive interior and exterior components, OA equipment components, seats, mechanical components and building materials.

[0003] One method to improve the heat resistance of polycarbonate resins is to add stabilizers. Aromatic phosphite stabilizers are commonly used for polycarbonate resins, and a representative example is tris(2,4-di-tert-butylphenyl) phosphite.

[0004] Numerous proposals exist for polycarbonate resin compositions in which the stabilizer is used, and, for example, in Patent Document 1, a method in which tris(nonylphenyl) phosphite is used in combination with tris(2,4-dibutylphenyl) phosphite has been proposed.

[0005] However, while tris(2,4-di-tert-butylphenyl) phosphite does have the effect of preventing discoloration and deterioration of polycarbonate resin, it also has the problem of reduced mechanical strength.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: JP H10-60247 A Summary of the Invention

[0009] The problem the invention aims to solve

[0010] Sometimes, fillers are compounded to improve the mechanical properties of polycarbonate resins. The object of this invention is to provide filler-reinforced polycarbonate resin compositions that have improved mechanical properties and are excellent in terms of flexural strength and impact resistance.

[0011] Solution for solving the problem

[0012] As a result of repeated and intensive research to achieve the above objectives, the inventors discovered that polycarbonate resin compositions comprising specific amounts of specific triaryl phosphate compounds, specific compounds having phenolic structures, and fibrous fillers respectively have improved mechanical properties and are excellent in terms of flexural strength and impact resistance, thus achieving the present invention.

[0013] This invention relates to the following polycarbonate resin compositions and molded articles.

[0014] 1. A polycarbonate resin composition comprising a polycarbonate resin (A), 0.0001 to 0.3 parts by weight of a triaryl phosphate ester (B) represented by the following general formula (1) relative to 100 parts by weight of the polycarbonate resin (A), 1 to 100 parts by weight of a fibrous filler (C), and at least one of the following (i) to (iv) in amounts:

[0015] (i) 0.0005 to 0.1 parts by weight of 2,4-di-tert-butylphenol,

[0016] (ii) 0.0001 to 0.03 parts by weight of 2,2-bis(4-hydroxyphenyl)propane,

[0017] (iii) 0.0005 to 0.05 parts by weight of 4-tert-butylphenol, and

[0018] (iv) 0.001 to 0.05 parts by weight of cumylphenol,

[0019] [Chemistry 1]

[0020]

[0021] In equation (1), R 1 To R 5 Each is independently a hydrogen atom or an alkyl group having 1 to 12 carbon atoms.

[0022] 2. The polycarbonate resin composition of 1 above, wherein the fibrous filler (C) is glass fiber, carbon fiber or a mixture thereof.

[0023] 3. The polycarbonate resin composition of 2 above, wherein the glass fiber is at least one selected from the group consisting of ground fibers, chopped filaments and flat glass fibers.

[0024] 4. The polycarbonate resin composition of any one of 1 to 3 above, wherein in formula (1), R 1 To R 5 At least one of them is an alkyl group having 1 to 12 carbon atoms.

[0025] 5. The polycarbonate resin composition of any one of 1 to 4 above, wherein in formula (1), R 1 and R 3 It is an alkyl group having 1 to 12 carbon atoms, and R 2 R 4 and R 5 It is a hydrogen atom.

[0026] 6. The polycarbonate resin composition of any one of 1 to 5 above, wherein in formula (1), R 1 and R 3 It is tert-butyl, and R 2 R 4 and R 5 It is a hydrogen atom.

[0027] 7. The polycarbonate resin composition of any one of 1 to 6 above further comprises 0.001 to 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite relative to 100 parts by weight of polycarbonate resin (A).

[0028] 8. The polycarbonate resin composition of any one of 1 to 7 above, wherein the polycarbonate resin (A) comprises recycled polycarbonate resin.

[0029] 9. A granule comprising the polycarbonate resin composition of any one of 1 to 8 above.

[0030] 10. The granules of the above 9, wherein the average length of the long side of the fibrous filler (C) in the granules is 50 μm or more, and the ratio of the average length of the long side to the average length of the short side is 5 or more.

[0031] 11. A molded article comprising the polycarbonate resin composition of any one of 1 to 8 above.

[0032] 12. A molded body obtained by molding the granules of the above 9 or 10.

[0033] The effects of the invention

[0034] The polycarbonate resin compositions of the present invention have advantageous mechanical properties, and are particularly excellent in terms of flexural strength and impact resistance. Attached Figure Description

[0035] [ Figure 1 (a) is a conceptual diagram of an example of glass fiber with a flat cross-sectional shape compounded with polycarbonate resin, and (b) is a conceptual diagram of an example of glass fiber with a flat cross-sectional shape in granules. Detailed Implementation

[0036] The present invention will now be described in detail with reference to implementation schemes and examples.

[0037] In this specification, unless otherwise specified, “to” is used to refer to the values ​​shown before and after “to” as lower and upper limits.

[0038] The polycarbonate resin composition of the present invention is a polycarbonate resin composition comprising polycarbonate resin (A), 0.0001 to 0.3 parts by weight of a triaryl phosphate ester (B) represented by the following general formula (1) relative to 100 parts by weight of polycarbonate resin (A), 1 to 100 parts by weight of a fibrous filler (C), and at least one of the following (i) to (iv) in the following amounts:

[0039] (i) 0.0005 to 0.1 parts by weight of 2,4-di-tert-butylphenol,

[0040] (ii) 0.0001 to 0.03 parts by weight of 2,2-bis(4-hydroxyphenyl)propane,

[0041] (iii) 0.0005 to 0.05 parts by weight of 4-tert-butylphenol, and

[0042] (iv) 0.001 to 0.05 parts by weight of cumylphenol.

[0043] [Polycarbonate resin (A)]

[0044] The polycarbonate resin (A) used in this invention is not particularly limited, and various polycarbonate resins can be used. Polycarbonate resins can be classified into aromatic polycarbonate resins in which the carbon atoms directly bonded to the carbon dioxide are each aromatic carbon atoms, and aliphatic polycarbonate resins in which the carbon atoms are each aliphatic carbon atoms, and either of these can be used. From the viewpoints of heat resistance, mechanical properties, and electrical properties, aromatic polycarbonate resin (A) is preferred.

[0045] Examples of aromatic dihydroxy compounds among monomers used as raw materials for aromatic polycarbonate resins include:

[0046] Dihydroxybenzenes, such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol) and 1,4-dihydroxybenzene;

[0047] Dihydroxybiphenyls, such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl and 4,4'-dihydroxybiphenyl;

[0048] 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;

[0049] Dihydroxy diaryl ethers, such as 2,2'-dihydroxy diphenyl ether, 3,3'-dihydroxy diphenyl ether, 4,4'-dihydroxy diphenyl ether, 4,4'-dihydroxy-3,3'-dimethyl diphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene and 1,3-bis(4-hydroxyphenoxy)benzene;

[0050] Bis(hydroxyaryl)alkanes, such as 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A),

[0051] 1,1-bis(4-hydroxyphenyl)propane,

[0052] 2,2-Bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C),

[0053] 2,2-bis(3-methoxy-4-hydroxyphenyl)propane,

[0054] 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane,

[0055] 1,1-Bis(3-tert-butyl-4-hydroxyphenyl)propane,

[0056] 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane,

[0057] 2,2-Bis(3-cyclohexyl-4-hydroxyphenyl)propane,

[0058] 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane,

[0059] α,α'-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene,

[0060] 1,3-Bis[2-(4-hydroxyphenyl)-2-propyl]benzene,

[0061] bis(4-hydroxyphenyl)methane,

[0062] bis(4-hydroxyphenyl)cyclohexylmethane,

[0063] bis(4-hydroxyphenyl)phenylmethane,

[0064] bis(4-hydroxyphenyl)(4-propenylphenyl)methane,

[0065] bis(4-hydroxyphenyl)diphenylmethane,

[0066] bis(4-hydroxyphenyl)naphthylmethane,

[0067] 1,1-bis(4-hydroxyphenyl)ethane,

[0068] 1,1-Bis(4-hydroxyphenyl)-1-phenylethane,

[0069] 1,1-Bis(4-hydroxyphenyl)-1-naphthylethane,

[0070] 1,1-Bis(4-hydroxyphenyl)butane,

[0071] 2,2-bis(4-hydroxyphenyl)butane,

[0072] 2,2-bis(4-hydroxyphenyl)pentane,

[0073] 1,1-bis(4-hydroxyphenyl)hexane,

[0074] 2,2-bis(4-hydroxyphenyl)hexane,

[0075] 1,1-Bis(4-hydroxyphenyl)octane,

[0076] 2,2-bis(4-hydroxyphenyl)octane,

[0077] 4,4-bis(4-hydroxyphenyl)heptane,

[0078] 2,2-bis(4-hydroxyphenyl)nonane,

[0079] 1,1-Bis(4-hydroxyphenyl)decane,

[0080] 1,1-Bis(4-hydroxyphenyl)dodecane;

[0081] Bis(hydroxyaryl)cycloalkanes, such as 1,1-bis(4-hydroxyphenyl)cyclopentane,

[0082] 1,1-Bis(4-hydroxyphenyl)cyclohexane,

[0083] 1,1-Bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane,

[0084] 1,1-Bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane,

[0085] 1,1-Bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane,

[0086] 1,1-Bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane,

[0087] 1,1-Bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane,

[0088] 1,1-Bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane,

[0089] 1,1-Bis(4-hydroxyphenyl)-3-tert-butylcyclohexane,

[0090] 1,1-Bis(4-hydroxyphenyl)-4-tert-butylcyclohexane,

[0091] 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, and

[0092] 1,1-Bis(4-hydroxyphenyl)-4-phenylcyclohexane;

[0093] Bisphenols containing a cardo structure, such as 9,9-bis(4-hydroxyphenyl)fluorene and

[0094] 9,9-Bis(4-hydroxy-3-methylphenyl)fluorene;

[0095] Dihydroxy diaryl sulfides, such as 4,4'-dihydroxydiphenyl sulfide and

[0096] 4,4'-Dihydroxy-3,3'-Dimethyl diphenyl sulfide;

[0097] Dihydroxy diaryl sulfoxides, such as 4,4'-dihydroxy diphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyl diphenyl sulfoxide;

[0098] Dihydroxy diaryl sulfones, such as 4,4'-dihydroxydiphenyl sulfone and

[0099] 4,4'-Dihydroxy-3,3'-Dimethyldiphenylsulfone;

[0100] wait.

[0101] Among them, bis(hydroxyaryl)alkanes are preferred, and even more so bis(4-hydroxyphenyl)alkanes, and particularly, from the viewpoint of impact resistance and heat resistance, 2,2-bis(4-hydroxyphenyl)propane and 2,2-bis(3-methyl-4-hydroxyphenyl)propane are preferred.

[0102] Aromatic dihydroxy compounds can be used alone, or two or more of them can be used in any combination and proportion.

[0103] Examples of monomers used as raw materials for polycarbonate resins, such as carbonyl halides and carbonates, are examples of carbonate precursors. Carbonate precursors can be used alone, or two or more can be used in any combination and proportion.

[0104] Specific examples of carbonyl halides include phosgene; halocarbamates, such as the dichlorocarbamate and monochlorocarbamate forms of dihydroxy compounds.

[0105] Specific examples of carbonates include diaryl carbonates, such as diphenyl carbonate and xylyl carbonate; dialkyl carbonates, such as dimethyl carbonate and diethyl carbonate; dihydroxy dicarbonates, dihydroxy monocarbonates and dihydroxy carbonates, such as cyclic carbonates.

[0106] There are no particular limitations on the method for producing polycarbonate resin (A), and any method can be used. Examples include interfacial polymerization, melt transesterification, pyridine polymerization, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among these, from the viewpoint of polycarbonate resin (A) with improved resistance to damp heat, interfacial polymerization and melt transesterification are preferred, and interfacial polymerization is particularly preferred.

[0107] Regarding the molecular weight of the polycarbonate resin (A), the viscosity-average molecular weight (Mv) is preferably from 10,000 to 50,000, more preferably from 10,000 to 40,000, particularly from 10,000 to 30,000 or from 10,000 to 26,000, even more preferably from 10,500 or more or from 11,000 or more, particularly preferably from 11,500 or more, and most preferably from 12,000 or more, and even more preferably from 24,000 or less, and particularly preferably from 20,000 or less. When the viscosity-average molecular weight is above the lower limit of the above range, the mechanical strength of the polycarbonate resin composition of the present invention can be improved, and when the viscosity-average molecular weight is below the upper limit of the above range, the flowability of the polycarbonate resin composition of the present invention can be improved by suppressing the reduction of flowability, and molding processing can be made easier by improving the processability.

[0108] Two or more polycarbonate resins with different viscosity-average molecular weights can be mixed and used, and in this case, polycarbonate resins with viscosity-average molecular weights outside the preferred range described above can also be mixed.

[0109] Viscosity-average molecular weight (Mv) refers to the value calculated using the Schnell viscosity equation after obtaining the intrinsic viscosity [η] (unit: dl / g) at 25°C using dichloromethane as a solvent and an Ubbelohde viscometer, i.e., η = 1.23 × 10⁻⁶. -4 Mv 0.83 Furthermore, intrinsic viscosity [η] refers to the specific viscosity [η] when measuring the concentration [l] (g / dl) of each solution. sp The value is then calculated using the following formula.

[0110] [Number 1]

[0111]

[0112] Furthermore, the polycarbonate resin (A) can be not only virgin resin, but also polycarbonate resin recycled from used products (so-called material-recycled polycarbonate resin) or polycarbonate resin produced from polycarbonate resin that has been chemically decomposed and returned to the raw materials (so-called chemically recycled polycarbonate resin). It is also preferable to include both virgin and recycled resin, and it can be composed of recycled polycarbonate resin. The proportion of recycled polycarbonate resin in polycarbonate resin (A) is preferably 40% or more, 50% or more, 60% or more, or 80% or more, and particularly preferably 100%.

[0113] Preferred examples of used products include various sheets, optical recording media such as optical discs (CDs and DVDs), light guide plates; transparent vehicle components such as automotive window glass, automotive headlight lenses and windshields; containers such as water bottles; various cap materials; eyeglass lenses; and building components such as soundproof walls, glass windows, and corrugated sheets. Furthermore, as recycled polycarbonate resin, defective products from molding, pulverized products obtained from the gating or runner, and granulated products obtained by melting the aforementioned products are also available.

[0114] [Triarylphosphate (B)]

[0115] The polycarbonate resin composition of the present invention comprises a triaryl phosphate (B) represented by general formula (1). In this specification, aryl means a group containing a monocyclic or polycyclic aromatic group, and particularly preferably means phenyl.

[0116] [Chemistry 2]

[0117]

[0118] In equation (1), R 1 To R 5 Each alkyl group is independently composed of hydrogen atoms or alkyl groups having 1 to 12 carbon atoms, preferably alkyl groups having 1 to 8 carbon atoms, and preferred examples include methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl, hexyl, heptyl, or octyl. Alkyl groups having 1 to 6 carbon atoms, particularly alkyl groups having 1 to 4 carbon atoms, are preferred.

[0119] In equation (1), when R on each of the three aromatic rings 1 To R 5 When two or more of the components are alkyl groups, the alkyl groups can be the same as or different from each other.

[0120] In triaryl phosphate (B), R on each aromatic ring in formula (1) 1 To R 5 At least one or more of them are preferably alkyl groups having 1 to 12 carbon atoms.

[0121] In addition, R on each aromatic ring 1 and R 3 It is an alkyl group having 1 to 12 carbon atoms, and each aromatic ring has an R 2 R 4 and R 5 More preferably, it is a hydrogen atom.

[0122] Specific examples of triaryl phosphates (B) include triphenyl phosphate, trimethylbenzyl phosphate, tridimethylbenzyl phosphate, tolyl diphenyl phosphate, tolyl-2,6-didimethylbenzyl phosphate, dimethylbenzyl phosphate, ethylphenyl diphenyl phosphate, diethylphenyl phosphate, propylphenyl diphenyl phosphate, dipropylphenyl phosphate, tripropylphenyl phosphate, butylphenyl diphenyl phosphate, dibutylphenyl phosphate, and tributylphenyl phosphate.

[0123] Among them, the triaryl phosphate (B) is preferably in formula (1) where R on each aromatic ring is... 1 and R 3 It is tert-butyl, and R on each aromatic ring 2 R 4 and R 5 It is a triaryl phosphate with hydrogen atoms, and is particularly preferred to be tris(2,4-di-tert-butylphenyl) phosphate.

[0124] Triaryl phosphates (B) can be used alone, or two or more of them can be used together.

[0125] The content of triaryl phosphate (B) is 0.0001 to 0.3 parts by weight relative to 100 parts by weight of polycarbonate resin (A). Resin compositions containing such amounts of triaryl phosphate also exhibit excellent flexural strength and impact resistance. The content of triaryl phosphate (B) is preferably 0.0005 parts by weight or more, particularly 0.001 parts by weight or more or 0.003 parts by weight or more, and especially preferably 0.005 parts by weight or more, and preferably 0.25 parts by weight or less, particularly 0.2 parts by weight or less, 0.15 parts by weight or less, 0.13 parts by weight or less, and especially preferably 0.10 parts by weight or less.

[0126] [Fibrous packing (C)]

[0127] The polycarbonate resin composition of the present invention comprises a fibrous filler (C). When triaryl phosphate (B) and fibrous filler (C) are combined, flexural strength and impact resistance can be improved.

[0128] As the fibrous filler used in this invention, any conventionally known fibrous filler can be used. Specific examples include glass fibers, carbon fibers, calcium silicate (wollastonite) fibers, alumina fibers, silica-alumina fibers, potassium titanate fibers, and ceramic fibers. Preferably, at least one selected from the group consisting of glass fibers, carbon fibers, wollastonite fibers, alumina fibers, and silica-alumina fibers is preferred. Glass fibers, carbon fibers, and mixtures thereof are preferred.

[0129] As glass fibers, not only glass fibers with a roughly perfect circular cross-sectional shape can be used, but also glass fibers with various irregular cross-sectional shapes can be used. The average fiber diameter of such glass fibers is preferably 1 to 25 μm, and more preferably 5 to 17 μm. When glass fibers with an average fiber diameter less than 1 μm are used, there is a concern that the formability may be impaired, and when glass fibers with an average fiber diameter greater than 25 μm are used, there is a concern that the external appearance may be impaired or the reinforcing effect may be insufficient. Furthermore, as glass fibers, continuously wound glass rovings, chopped filaments with a trimmed length (cut length) of 1 to 10 mm, ground fibers pulverized to an average fiber length of about 10 to 500 μm, and other glass fibers with a length ( ) Figure 1 2) The cross-section has flat glass fibers (also known as flat glass fibers) or elliptical glass fibers in orthogonal directions, and these can also be used together.

[0130] In glass fibers with a flat cross-section, the length of the short side ( Figure 1 1) is defined as the fiber diameter (in some cases called the major axis), and in glass fibers with an elliptical cross-sectional shape, the length of the major axis of the ellipse is defined as the fiber diameter.

[0131] When using fiberglass, impact resistance becomes more advantageous, which is preferred.

[0132] As carbon fibers, there are various types (flame-retardant, carbonaceous, and graphite, etc.) of carbon fibers that are typically produced by burning acrylic fibers, petroleum, special carbon pitch, cellulose fibers, or lignin as raw materials, and the matrix material is irrelevant. The average fiber diameter of such carbon fibers is preferably 1 to 20 μm, and more preferably 3 to 15 μm. When using carbon fibers with an average fiber diameter less than 1 μm, there is a concern that the formability may be impaired, and when using carbon fibers with an average fiber diameter greater than 20 μm, there is a concern that the appearance may be impaired and the reinforcing effect may be insufficient.

[0133] When carbon fiber is used, the tensile strength becomes more advantageous, which is preferred.

[0134] The average fiber diameter and average fiber length of the fibrous filler (C) can be obtained, for example, by randomly selecting 50 fibers from 10g of fibrous filler, observing and measuring the fiber diameter and length of each fiber under a microscope, and obtaining the average value of the measurement results.

[0135] Furthermore, the average fiber diameter and average fiber length of the fibrous filler (C) mentioned herein refer to the average fiber diameter and average fiber length of the fibrous filler (C) when it is blended with polycarbonate resin (A) to produce polycarbonate resin composition granules, and not to the average length of the long side and the average length of the short side of the fibrous filler (C) in the granules obtained as described below.

[0136] The fibrous filler (C) can undergo surface treatment, wherein the surface of the fibrous filler is coated as needed with fatty acids such as stearic acid or oleic acid, paraffin wax, wax, organosilane, organotitanate, epoxy resin or urethane resin, etc.

[0137] The content of fibrous filler (C) is 1 to 100 parts by weight relative to 100 parts by weight of polycarbonate resin (A). When the content of fibrous filler (C) is less than 1 part by weight, the improvement effect on impact resistance or elastic modulus is insufficient, and when the content exceeds 100 parts by weight, the appearance of the polycarbonate resin molded article may deteriorate. The content is preferably 3 parts by weight or more, more preferably 5 parts by weight or more, more preferably 90 parts by weight or less, and particularly preferably 80 parts by weight or less.

[0138] [Polycarbonate oligomers]

[0139] The polycarbonate resin compositions of the present invention may contain polycarbonate oligomers to improve the appearance or flowability of the molded articles. The polycarbonate oligomers are, for example, carbonate oligomers with a viscosity-average molecular weight (Mv) of less than 10,000. The viscosity-average molecular weight (Mv) of the polycarbonate oligomers is measured using the same method as for the viscosity-average molecular weight (Mv) of polycarbonate resins.

[0140] The viscosity-average molecular weight (Mv) of the polycarbonate oligomer is typically 1,500 or more, preferably 2,000 or more, and more preferably 3,000 or more, and typically 9,500 or less, preferably 9,000 or less, and more preferably 8,000 or less. Furthermore, the content of the polycarbonate oligomer is preferably set to 30% by mass or less of the polycarbonate resin.

[0141] There are no particular limitations on the polycarbonate oligomer, as long as it contains a -[OR-OC(=O)]- unit with carbonate bonds in the main molecular chain (R contains an organic group, preferably a hydrocarbon group, and more preferably an aliphatic group, an aromatic group, or both an aliphatic group and an aromatic group, and further has a straight-chain or branched structure). In this embodiment, the polycarbonate oligomer is preferably an aromatic polycarbonate oligomer, and more preferably a polycarbonate oligomer with a bisphenol backbone.

[0142] When polycarbonate oligomers are compounded, the affinity between polycarbonate resin (A) and glass fiber tends to improve.

[0143] [Compounds with phenolic structures]

[0144] The polycarbonate resin composition of the present invention comprises at least one of the following compounds (i) to (iv) having a phenolic structure:

[0145] (i) 0.0005 to 0.1 parts by weight of 2,4-di-tert-butylphenol,

[0146] (ii) 0.0001 to 0.03 parts by weight of 2,2-bis(4-hydroxyphenyl)propane,

[0147] (iii) 0.0005 to 0.05 parts by weight of 4-tert-butylphenol, and

[0148] (iv) 0.001 to 0.05 parts by weight of cumylphenol.

[0149] When a specific amount of at least one compound having a phenolic structure is included together with a triaryl phosphate ester (B), the flexural strength and impact resistance of the polycarbonate resin composition can be further improved.

[0150] In the above compounds, the polycarbonate resin composition preferably comprises at least any one of (i) 0.0005 to 0.1 parts by weight of 2,4-di-tert-butylphenol, (ii) 0.0001 to 0.03 parts by weight of 2,2-bis(4-hydroxyphenyl)propane, or (iii) 0.0005 to 0.05 parts by weight of 4-tert-butylphenol. When the polycarbonate resin composition comprises these compounds together with triaryl phosphate (B), the polycarbonate resin composition can exhibit excellent flexural strength and impact resistance.

[0151] The content of 2,4-di-tert-butylphenol relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.001 parts by weight or more, more preferably 0.003 parts by weight or more, and particularly preferably 0.005 parts by weight or more, and preferably 0.08 parts by weight or less, more preferably 0.07 parts by weight or less, even more preferably 0.06 parts by weight or less, and particularly preferably 0.05 parts by weight or less.

[0152] The content of 2,2-bis(4-hydroxyphenyl)propane relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.002 parts by weight or more, more preferably 0.003 parts by weight or more, and even more preferably 0.004 parts by weight or more, and preferably 0.02 parts by weight or less.

[0153] The content of 4-tert-butylphenol relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.0010 parts by weight or more, more preferably 0.0012 parts by weight or more, even more preferably 0.0015 parts by weight or more, and preferably 0.0035 parts by weight or less.

[0154] The content of cumylphenol (i.e., 2-(4-hydroxyphenyl)-2-phenylpropane or 4-α-cumylphenol) relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.0012 parts by weight or more, more preferably 0.0015 parts by weight or more, more preferably 0.01 parts by weight or less, more preferably 0.005 parts by weight or less, and particularly preferably 0.0035 parts by weight or less.

[0155] [Tris(2,4-di-tert-butylphenyl)phosphite]

[0156] The polycarbonate resin composition of the present invention preferably further comprises 0.001 to 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite relative to 100 parts by weight of polycarbonate resin (A). When the polycarbonate resin composition comprises such an amount of tris(2,4-di-tert-butylphenyl) phosphite together with triaryl phosphate (B) and a compound having a phenolic structure, flexural strength and impact resistance can be further improved.

[0157] The content of tris(2,4-di-tert-butylphenyl) phosphite is more preferably 0.002 parts by mass or more, particularly 0.003 parts by mass or more or 0.004 parts by mass, and especially preferably 0.005 parts by mass or more, and more preferably 0.25 parts by mass or less, particularly 0.2 parts by mass or less, 0.15 parts by mass or less or 0.13 parts by mass, and especially preferably 0.10 parts by mass or less.

[0158] [Arylphosphine and arylphosphine oxides]

[0159] The polycarbonate resin composition of the present invention preferably also contains arylphosphine or arylphosphine oxide.

[0160] Preferred examples of arylphosphine include triphenylphosphine, diphenylbutylphosphine, diphenyloctadecylphosphine, tris(p-tolyl)phosphine, tris(p-nonylphenyl)phosphine, tris(naphthyl)phosphine, diphenyl(hydroxymethyl)phosphine, diphenyl(acetoxymethyl), diphenyl(β-ethylcarboxyethyl)phosphine, tris(p-chlorophenyl)phosphine, tris(p-fluorophenyl)phosphine, diphenylbenzylphosphine, diphenyl-β-cyanoethylphosphine, diphenyl(p-hydroxyphenyl)phosphine, diphenyl-1,4-dihydroxyphenyl-2-phosphine, and phenylnaphthylbenzylphosphine, etc., with triarylphosphine being preferred, and preferred examples of triphenylphosphine and trio-tolylphosphine, and particularly preferred triphenylphosphine.

[0161] When arylphosphine is included, the content of arylphosphine relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.001 to 0.3 parts by weight. Resin compositions containing such amounts of arylphosphine together with triaryl phosphate (B) exhibit excellent flexural strength, tensile strength, and impact resistance. The content of arylphosphine is more preferably 0.005 parts by weight or more, particularly 0.008 parts by weight or more, and especially preferably 0.01 parts by weight or more, and more preferably 0.25 parts by weight or less, particularly 0.2 parts by weight or less, 0.15 parts by weight or less, 0.1 parts by weight or less, or 0.05 parts by weight or less, and especially preferably 0.04 parts by weight or less.

[0162] Preferred examples of arylphosphine oxides include triphenylphosphine oxide, diphenylbutylphosphine oxide, diphenyloctadecylphosphine oxide, tri(p-tolyl)phosphine oxide, tri(p-nonylphenyl)phosphine oxide, tri(naphthyl)phosphine oxide, diphenyl(hydroxymethyl)phosphine oxide, diphenyl(acetoxymethyl)phosphine oxide, diphenyl(β-ethylcarboxyethyl)phosphine oxide, tri(p-chlorophenyl)phosphine oxide, tri(p-fluorophenyl)phosphine oxide, diphenylbenzylphosphine oxide, diphenyl-β-cyanoethylphosphine oxide, diphenyl(p-hydroxyphenyl)phosphine oxide, diphenyl-1,4-dihydroxyphenyl-2-phosphine oxide, and phenylnaphthylbenzylphosphine oxide, etc., with triarylphosphine oxide being preferred, and triphenylphosphine oxide being particularly preferred.

[0163] When arylphosphine oxide is included, the content of arylphosphine oxide relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.001 to 0.3 parts by weight. Resin compositions containing such amounts of arylphosphine oxide, together with triaryl phosphate (B) and the other aforementioned components, can further improve flexural strength, tensile strength, and impact resistance. The content of arylphosphine oxide is more preferably 0.002 parts by weight or more, particularly 0.003 parts by weight or more or 0.004 parts by weight or more, and especially preferably 0.005 parts by weight or more, and more preferably 0.25 parts by weight or less, particularly 0.2 parts by weight or less, 0.15 parts by weight or less, or 0.13 parts by weight or less, and especially preferably 0.10 parts by weight or less.

[0164] [Styrene-based resins]

[0165] The polycarbonate resin composition of the present invention preferably also contains a styrene-based resin.

[0166] Styrene-based resins are preferably either a single aromatic vinyl monomer (b1) or a resin obtained by polymerizing an aromatic vinyl monomer (b1) with one or more of other vinyl monomers (b2 and b4) and rubber polymers (b3) that can be copolymerized as needed.

[0167] Examples of aromatic vinyl monomers (b1) used as styrene-based resins include styrene and styrene derivatives, such as α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, methoxystyrene, monobromostyrene, dibromostyrene, fluorostyrene, and tribromostyrene, with styrene being particularly preferred.

[0168] These can be used individually, or two or more of them can be mixed together and used.

[0169] As other vinyl monomers that can copolymerize with these aromatic vinyl monomers (b1), vinyl cyanide monomers (b2) are preferred, and examples of them include acrylonitrile and methacrylonitrile.

[0170] In addition, examples of copolymerizable monomers (b4) other than vinyl cyanide monomers (b2) include aryl esters of acrylic acid such as phenyl acrylate and benzyl acrylate; alkyl esters of acrylic acid such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, and dodecyl acrylate; aryl esters of methacrylate such as phenyl methacrylate and benzyl methacrylate; and alkyl esters of methacrylate such as methyl methacrylate, methyl... Ethyl acrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, 2-ethylhexyl methacrylate, octyl methacrylate, cyclohexyl methacrylate, and dodecyl methacrylate; epoxy-containing methacrylates such as glycidyl methacrylate; maleimide monomers such as maleimide, N-methylmaleimide, and N-phenylmaleimide; α,β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, phthalic acid, and itaconic acid and their anhydrides. Alkyl acrylates and alkyl methacrylates are preferred.

[0171] These other monomers (b4) can be used alone, or two or more of them can be mixed together and used.

[0172] Furthermore, as a rubber polymer (b3) that can copolymerize with aromatic vinyl monomers (b1), a rubber with a glass transition temperature of 10°C or lower is preferred. Specific examples of such rubber polymers include diene rubbers, acrylic rubbers, ethylene / propylene rubbers, silicone rubbers, and composite rubbers (IPN-type rubbers) having a structure in which the polyorganosiloxane rubber component and the poly(meth)acrylate alkyl ester rubber component are entangled with each other so that the two components cannot be separated from each other, and preferred examples include diene rubbers and acrylic rubbers.

[0173] In this specification, “(meth)acrylate” means one or both of “acrylate” and “methacrylate”, and this also applies to “(meth)acrylic acid” and “(meth)acryloyl”.

[0174] Examples of diene-based rubbers include polybutadiene, styrene-butadiene random copolymers and block copolymers, acrylonitrile-butadiene copolymers, polyisoprene, butadiene-isoprene copolymers, copolymers of ethylene, propylene and non-conjugated dienes such as ethylene-propylene-hexadiene copolymers, butadiene-(meth)acrylic acid lower alkyl ester copolymers and butadiene-styrene-(meth)acrylic acid lower alkyl ester copolymers, etc.

[0175] Examples of lower alkyl esters of (meth)acrylic acid include methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate.

[0176] The proportion of lower alkyl esters of (meth)acrylic acid in the butadiene-(meth)acrylic acid lower alkyl ester copolymer or the butadiene-styrene-(meth)acrylic acid lower alkyl ester copolymer is preferably less than 30% by mass of the rubber polymer.

[0177] Examples of acrylic rubbers include alkyl acrylate rubbers, wherein the alkyl group preferably has 1 to 8 carbon atoms. Specific examples of alkyl acrylates include ethyl acrylate, butyl acrylate, and hexyl acrylate. In alkyl acrylate rubbers, olefinically unsaturated monomers may be used in any way. Specific examples of such compounds include di(meth)acrylate, divinylbenzene, trivinylbenzene, triallyl cyanurate, allyl (meth)acrylate, butadiene, and isoprene. Further examples of acrylic rubbers include core-shell polymers having a crosslinked diene rubber as the core.

[0178] These rubber polymers (b3) can be used alone, or two or more of them can be mixed together and used.

[0179] The styrene-based resin is preferably composed of 50 to 100% by mass of an aromatic vinyl monomer component (b1), 0 to 30% by mass of a vinyl cyanide monomer component (b2), 0 to 30% by mass of a rubber polymer component (b3), and 0 to 30% by mass of other monomer components (b4). More preferably, it is composed of 50 to 80% by mass of an aromatic vinyl monomer component (b1), 10 to 30% by mass of a vinyl cyanide monomer component (b2), 5 to 25% by mass of a rubber polymer component (b3), and 0 to 20% by mass of other monomer components (b4). Even more preferably, it is composed of 55 to 70% by mass of an aromatic vinyl monomer component (b1), 15 to 25% by mass of a vinyl cyanide monomer component (b2), 10 to 25% by mass of a rubber polymer component (b3), and 0 to 5% by mass of other monomer components (b4).

[0180] Specific examples of styrene-based resins include, for example, styrene homopolymers, copolymers of styrene and (meth)acrylonitrile, copolymers of styrene and alkyl methacrylates, copolymers of styrene, (meth)acrylonitrile and other copolymerizable monomers, graft copolymers obtained by polymerizing styrene in the presence of rubber, and graft copolymers obtained by graft polymerization of styrene and (meth)acrylonitrile in the presence of rubber, etc.

[0181] Specific examples include resins such as polystyrene, high-impact polystyrene (HIPS), acrylonitrile-styrene copolymers (AS resin), styrene-maleic anhydride copolymers (SMA resin), acrylonitrile-butadiene-styrene copolymers (ABS resin), acrylonitrile-styrene-acrylic rubber copolymers (ASA resin), styrene-butadiene-styrene copolymers (SBS resin), hydrogenated styrene-butadiene-styrene copolymers (hydrogenated SBS), hydrogenated styrene-isoprene-styrene copolymers (SEPS), acrylonitrile-acrylic rubber-styrene copolymers (AAS resin), acrylonitrile-ethylene-propylene rubber-styrene copolymers (AES resin), and styrene-IPN type rubber copolymers, or mixtures thereof.

[0182] Among them, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene-acrylic rubber copolymer (ASA resin) and acrylonitrile-ethylene-propylene rubber-styrene copolymer (AES resin) are preferred, among which acrylonitrile-butadiene-styrene copolymer (ABS resin) and acrylonitrile-styrene copolymer (AS resin) are preferred, and in particular, acrylonitrile-butadiene-styrene copolymer (ABS resin) is preferred.

[0183] When the resin composition contains a styrene-based resin, the flowability of the resin composition can be improved. When a styrene-based resin is included, the content of the styrene-based resin relative to 100 parts by weight of polycarbonate resin (A) is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, and preferably 40 parts by weight or less, more preferably 30 parts by weight or less.

[0184] [Mold Release Agent]

[0185] The resin composition of the present invention preferably also contains a release agent.

[0186] Examples of mold release agents include aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, and polysiloxane silicone oils.

[0187] Examples of aliphatic carboxylic acids include saturated or unsaturated aliphatic monovalent, divalent, or trivalent carboxylic acids. Aliphatic carboxylic acids also include alicyclic carboxylic acids. Preferably, the aliphatic carboxylic acids are monovalent or divalent carboxylic acids with 6 to 36 carbon atoms, and more preferably, they are saturated aliphatic monovalent carboxylic acids with 6 to 36 carbon atoms. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, hexanoic acid, decanoic acid, lauric acid, arachidic acid, benzanoic acid, tetracosanoic acid, ceric acid, beeswax acid, tritetracosanoic acid, linalool, adipic acid, and azelaic acid.

[0188] Aliphatic carboxylic acids, as esters of aliphatic carboxylic acids and alcohols, can be, for example, the same aliphatic carboxylic acids as described above. On the other hand, examples of alcohols include saturated or unsaturated monovalent or polyvalent alcohols. These alcohols may have substituents, such as fluorine atoms or aryl groups. Monovalent or polyvalent saturated alcohols with 30 or fewer carbon atoms are preferred, and aliphatic saturated monovalent alcohols or aliphatic saturated polyvalent alcohols with 30 or fewer carbon atoms are more preferred. Here, the term "aliphatic" is used as a term that also includes alicyclic compounds.

[0189] Specific examples of such alcohols include octanol, decanol, dodecylol, stearyl alcohol, betaine alcohol, ethylene glycol, diethylene glycol, glycerol, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentyl glycol, ditrimethylolpropane, and dipentaerythritol.

[0190] The aforementioned esters may contain aliphatic carboxylic acids and / or alcohols as impurities. Furthermore, the ester may be a pure substance or a mixture of multiple compounds. Additionally, the aliphatic carboxylic acids and alcohols bonded together to form an ester may be used individually, or two or more may be used in any combination and proportion.

[0191] Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (which mainly comprises a mixture of beeswax palmitate), stearate, benzyl benzyl acid, stearate, glyceryl monopalmitate, glyceryl monostearate, glyceryl distearate, glyceryl tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate, etc.

[0192] Examples of aliphatic hydrocarbons with 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 with 3 to 12 carbon atoms. Aliphatic hydrocarbons also include alicyclic hydrocarbons. Furthermore, these hydrocarbons can be partially oxidized.

[0193] Paraffin wax and polyethylene wax or partial oxides of polyethylene wax are preferred, and paraffin wax and polyethylene wax are even more preferred.

[0194] In addition, aliphatic hydrocarbons are preferably those with a number-average molecular weight of 5,000 or less.

[0195] Aliphatic hydrocarbons can be single substances, but mixtures of substances with various constituent components or molecular weights can also be used as aliphatic hydrocarbons, as long as the main components are within the above range.

[0196] Examples of polysiloxane silicone oils include dimethyl silicone oil, methylphenyl silicone oil, diphenyl silicone oil, and fluorinated alkylsiloxanes.

[0197] The aforementioned release agents may be included individually, or two or more of them may be included in any combination and proportion.

[0198] The content of the mold release agent relative to 100 parts by weight of polycarbonate resin (A) is typically 0.001 parts by weight or more, and preferably 0.01 parts by weight or more, and typically 2 parts by weight or less, preferably 1 part by weight or less, and more preferably 0.5 parts by weight or less. When the content of the mold release agent is less than the lower limit of this range, the mold release effect may be insufficient, and when the content of the mold release agent exceeds the upper limit of this range, there is a possibility that the hydrolysis resistance may deteriorate and mold contamination may occur during injection molding.

[0199] [Additives, etc.]

[0200] The polycarbonate resin composition of the present invention may contain other additives besides those described above, such as fluorescent whitening agents, pigments (including carbon black), dyes, flame retardants, UV absorbers, impact modifiers, plasticizers, and compatibilizers. These additives may be contained individually or in combination with two or more of them.

[0201] Furthermore, the polycarbonate resin composition may contain resins other than polycarbonate resin (A) and styrene-based resins. Examples of other resins include thermoplastic polyester resins such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate; polyolefin resins such as polyethylene resin and polypropylene resin; polyamide resins; polyimide resins; polyetherimide resins; polyurethane resins; polyphenylene ether resins; polyphenylene sulfide resins; polysulfone resins; and polymethacrylate resins, etc. Polybutylene terephthalate resin is preferred as one of the other resins.

[0202] It may not contain other resins, and when other resins are included, their content is preferably less than 5 parts by weight relative to 100 parts by weight of polycarbonate resin (A). Furthermore, when included, other resins may be included alone, or two or more may be included in any combination and proportion.

[0203] [Method for producing polycarbonate resin composition granules]

[0204] The mixing conditions for producing the granules of the polycarbonate resin composition of the present invention also vary depending on the type and mixing ratio of the components used in the polycarbonate resin composition; however, among the components mixed with the polycarbonate resin composition, the fibrous filler (C) is preferably melt-mixed separately from the other components, and it is particularly preferred to side-feed when melt-mixing using an extruder, supplied from the middle part of the extruder to the melt-mixed material obtained by fully melt-mixing the other components, such as the polycarbonate resin, and melt-mixing.

[0205] There are no particular restrictions on the melt mixing temperature, but it is usually in the range of 240°C to 320°C.

[0206] The filament molten from the extruder is rapidly cooled in a water bath and cut using a granulator, thereby obtaining the polycarbonate resin composition granules of the present invention.

[0207] [Average length of the long side and average length of the short side of the fibrous filler (C) in the granular material]

[0208] In this invention, it is preferable that the average length of the long side (also referred to as the fiber length) of the fibrous filler (C) in the polycarbonate resin composition granules is 50 μm or more, and the ratio of the average length of the long side to the average length of the short side (also referred to as the fiber diameter) is 5 or more. When the average length of the long side of the fibrous filler (C) in the granules is 50 μm or more, and the ratio of the average length of the long side to the average length of the short side is 5 or more, the resulting molded article exhibits excellent impact resistance or flexural strength. When the average length of the long side is less than 50 μm or the ratio of the average length of the long side to the average length of the short side is less than 5, there is a concern that the impact resistance or flexural strength of the molded article may become insufficient.

[0209] The average length of the long side of the fibrous filler (C) in the polycarbonate resin composition granules is more preferably 70 μm or more, more preferably 550 μm or less, more preferably 500 μm or less, even more preferably 400 μm or less, and particularly preferably 100 μm or less.

[0210] Furthermore, the ratio of the average length of the long side to the average length of the short side is more preferably 10 or more, more preferably 500 or less, more preferably 300 or less, and particularly preferably 100 or less.

[0211] The average length of the long side and the average length of the short side of the fibrous filler (C) in the polycarbonate resin composition granules can be obtained by the following: Specifically, 2g of the obtained granules are heated at 600°C for two hours to volatilize the organic components, such as the resin, and to recover the fibrous filler. The fibrous filler is dispersed in methanol, and the methanol dispersion of the fibrous filler is added dropwise to a glass plate. The methanol is removed by drying, and then the lengths of the long and short sides of 50 randomly selected fibrous fillers are measured by microscopic observation, and their average values ​​are obtained.

[0212] There are no particular limitations on the method of forming the molded article from polycarbonate resin composition granules. Conventionally known molding methods can be used, and examples include injection molding, injection compression molding, extrusion molding, profile extrusion, transfer molding, blow molding, gas-assisted blow molding, blow molding, extrusion blow molding, IMC (in-mold coating) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding. Among these, injection molding is particularly preferred.

[0213] There are no particular restrictions on the shape of the molded article, and it can be appropriately selected according to the use or purpose of the molded article. Examples include chassis, board-like articles, plate-like articles, rod-like articles, sheet-like articles, film-like articles, cylindrical articles, ring-like articles, round articles, elliptical articles, polygonal articles, profile molded articles, hollow articles, frame-like articles, box-like articles, and panel-like articles.

[0214] [Example]

[0215] The following steps were taken to confirm the effects of the polycarbonate resin composition of the present invention, but the present invention should not be construed as limited to the following examples.

[0216] The components used are shown in Tables 1 and 2 below.

[0217] [Table 1]

[0218]

[0219] [Table 2]

[0220]

[0221] (Examples 1 to 38 and Comparative Examples 1 to 27)

[0222] In addition to the above components, components that do not contain glass fiber and carbon fiber are compounded in the proportions (parts by weight) shown in Tables 3 to 11 below and mixed using a drum mixer for 20 minutes. Then, glass fiber and carbon fiber are side-fed, and the components are melt-blended at a barrel temperature of 280°C using a twin-screw extruder with a screw diameter of 25 mm (“TEX-25αIII” manufactured by Japan Steelworks, Ltd.), and the wire is cut to obtain pellets.

[0223] <Average length of the long side and average length of the short side of the fibrous filler (C) in the granular material>

[0224] Two grams of the obtained granules were heated at 600°C for 2 hours to volatilize organic components such as resin and recover the fibrous filler. The fibrous filler was dispersed in methanol. The methanol dispersion of the fibrous filler was added dropwise to a glass plate. The methanol was dried and removed. The lengths of the long and short sides of 50 randomly selected fibrous fillers were then measured under a microscope, and their average values ​​were obtained.

[0225] <Measurement of bar flow length>

[0226] The granules obtained above were dried at 120°C for 5 hours. Then, using an injection molding machine (NEX80III, clamping force of 80 tons) manufactured by Nissei Plastics Industrial Co., Ltd., a rod-flow molded body with a width of 20 mm and a thickness of 2 mm was injection molded under the following conditions: barrel set temperature of 300°C, mold temperature of 100°C, injection pressure of 150 MPa, injection time of 5 seconds and molding cycle of 40 seconds. The flow length (unit: mm) was evaluated.

[0227] The resin composition granules obtained above were dried at 120°C for 5 hours, and then ISO multipurpose test pieces (4 mm thick) were injection molded using an injection molding machine (NEX80III) manufactured by Nissei Plastics Industrial Co., Ltd. under the conditions of a barrel set temperature of 300°C, a mold temperature of 110°C, an injection pressure of 100 MPa, an injection time of 2 seconds, and a molding cycle of 50 seconds.

[0228] Measurement of Unnotched Charpy Impact Strength

[0229] Unnotched Charpy impact strength (unit: kJ / m) 2 )Measure using ISO multipurpose test pieces obtained by the above method according to ISO 179-1 and ISO 179-2.

[0230] Measurement of Bending Strength and Tensile Strength

[0231] Using the ISO multipurpose test piece obtained by the above method, the flexural strength (unit: MPa) was measured according to ISO 178, and the tensile strength (unit: MPa) was measured at 23°C according to ISO standards 527-1 and 527-2.

[0232] The evaluation results are shown in Tables 3 to 11 below.

[0233] [Table 3]

[0234]

[0235] [Table 4]

[0236]

[0237] [Table 5]

[0238]

[0239] [Table 6]

[0240]

[0241] [Table 7]

[0242]

[0243] [Table 8]

[0244]

[0245] [Table 9]

[0246]

[0247] [Table 10]

[0248]

[0249] [Table 11]

[0250]

[0251] Industrial availability

[0252] The polycarbonate resin composition of the present invention has improved mechanical properties and is excellent in terms of flexural strength and impact resistance, and is therefore suitable for a variety of molded articles.

[0253] Explanation of reference numerals in the attached figures

[0254] 1. Short side

[0255] 2 Long side

[0256] 3. Short diameter

Claims

1. A polycarbonate resin composition comprising a polycarbonate resin (A), 0.0001 to 0.3 parts by mass of a triaryl phosphate represented by the following general formula (1) (B), 1 to 100 parts by mass of a fibrous filler (C), and the following (i) to (iv) in the following amounts, relative to 100 parts by mass of the polycarbonate resin (A): (i) 0.0005 to 0.1 parts by mass of 2-4-di-tert-butylphenol, (ii) 0.0001 to 0.03 parts by mass of 2,2-bis(4-hydroxyphenyl)propane, (iii) 0.0005 to 0.05 parts by mass of 4-tert-butylphenol, and (iv) 0.001 to 0.05 parts by mass of cumyl phenol.

2. The polycarbonate resin composition according to claim 1, wherein the fibrous filler (C) is glass fiber, carbon fiber, or a mixture thereof.

3. The polycarbonate resin composition according to claim 2, wherein the glass fiber is at least one selected from the group consisting of milled fiber, chopped strand, and flat glass fiber.

7. The polycarbonate resin composition according to claim 1, further comprising 0.001 to 0.3 parts by mass of tris(2,4-di-tert-butylphenyl) phosphite, relative to 100 parts by mass of the polycarbonate resin (A).

8. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin (A) comprises a recycled polycarbonate resin. [in formula (1), R 1 to R 5 each independently is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms.

9. A pellet comprising the polycarbonate resin composition according to any one of claims 1 to 8.

10. The pellet according to claim 9, wherein the fibrous filler (C) in the pellet has an average length of a long side of 50 μm or more, and a ratio of the average length of the long side to an average length of a short side is 5 or more.

4. The polycarbonate resin composition according to claim 1, wherein in formula (1), R 1 at least one of R 5 is an alkyl group having 1 to 12 carbon atoms.

5. The polycarbonate resin composition according to any one of claims 1 or 4, wherein in formula (1), R 1 and R 3 are alkyl groups having a carbon number of 1 to 12, and R 2 , R 4 , and R 5 are hydrogen atoms.

6. The polycarbonate resin composition according to claim 5, wherein in formula (1), R 1 and R 3 are a tert-butyl group, and R 2 , R 4 and R 5 are hydrogen atoms.

1. A polycarbonate resin composition comprising: a polycarbonate resin; and a compound represented by formula (1) : ###0001### wherein R1 and R2 are each independently a hydrogen atom or a C1-6 alkyl group, R3 is a C1-6 alkyl group, R4 is a C1-6 alkyl group or a C6-10 aryl group, R5 is a C 11. A molded body comprising the polycarbonate resin composition according to any one of claims 1 to 8.

12. A molded body obtained by molding the pellet according to claim 9. ​ ​ ​ ​

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