Polycarbonate resin composition and molded article made therefrom

Abstract

The present invention provides a polycarbonate resin composition containing carbon fibers that possesses high strength and rigidity, and excellent impact resistance. [Solution] A polycarbonate resin composition comprising (A) 100 parts by weight of polycarbonate resin (component A) and (B) 5 to 100 parts by weight of carbon fiber (component B) having a number-average fiber length variation coefficient of 0.4 or more.

Description

Technical Field

[0001] The present invention relates to a polycarbonate resin composition containing carbon fibers having a coefficient of variation in number average fiber length of 0.4 or more, and a molded product made therefrom.

Background Art

[0002] Polycarbonate resin is excellent in transparency, impact resistance, heat resistance and dimensional stability, and is used as an engineering plastic in a wide range of fields such as casings of electrical and electronic devices, interior and exterior parts of automobiles, building materials, furniture, musical instruments and miscellaneous goods. In particular, a polycarbonate resin composition containing carbon fibers is excellent in mechanical properties, impact resistance, dimensional stability and conductivity, and is used for camera parts, notebook computer parts and mobile phone parts, etc. (For example, Patent Document 1). To improve the mechanical properties of a polycarbonate resin composition containing carbon fibers, the content of carbon fibers can be increased. However, increasing the content of carbon fibers improves strength and rigidity but has the problem that impact resistance decreases. On the other hand, from the viewpoint of effectively utilizing limited resources, the development of materials using recycled carbon fibers recovered from end materials generated during carbon fiber production is desired.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a polycarbonate resin composition having high strength and rigidity and excellent impact resistance, and a molded product made therefrom.

Means for Solving the Problems

[0005] As a result of diligent research to achieve the above objectives, the inventors have discovered that a polycarbonate resin composition containing carbon fibers having a specific coefficient of variation in fiber length, and a molded article made therefrom, can solve the above objectives, leading to the present invention. That is, according to the present invention, the following 1 to 8 are provided.

[0006] 1. A polycarbonate resin composition comprising (A) 100 parts by weight of polycarbonate resin (component A) and (B) 5 to 100 parts by weight of carbon fibers (component B) having a number-average fiber length variation coefficient of 0.4 or more. 2. The polycarbonate resin composition according to item 1 above, wherein component A is a polycarbonate resin having a terminal OH group content of 0.35% or more. 3. The polycarbonate resin composition according to item 1 or 2 above, wherein component B is carbon fiber obtained by recycling process scraps from the carbon fiber manufacturing process. 4. A polycarbonate resin composition according to any one of items 1 to 3 above, comprising 0.001 to 1.0 parts by weight of (C) phosphorus-based stabilizer (component C) per 100 parts by weight of component A. 5. A polycarbonate resin composition according to any one of items 1 to 4 above, comprising 0.01 to 10 parts by weight of (D) mold release agent (component D) per 100 parts by weight of component A. 6. A polycarbonate resin composition according to any one of items 1 to 5 above, wherein the flexural strength of the polycarbonate resin composition described in item 1 above is greater than the flexural strength of a polycarbonate resin composition in which component B is carbon fiber with a number-average fiber length variation coefficient of less than 0.4. 7. A polycarbonate resin composition according to any one of paragraphs 1 to 6, wherein the notched Charpy impact strength of the polycarbonate resin composition described in paragraph 1 is equal to or greater than that of a polycarbonate resin composition in which component B is carbon fiber with a number-average fiber length variation coefficient of less than 0.4. 8. A molded article made from a polycarbonate resin composition as described in any of items 1 to 7 above. [Effects of the Invention]

[0007] The polycarbonate resin composition of the present invention and a molded article made therefrom have high strength and rigidity and are excellent in impact resistance, and thus are particularly preferably used as camera parts, notebook computer parts, and mobile phone parts. Therefore, the industrial effect achieved thereby is remarkable.

Mode for Carrying Out the Invention

[0008] Hereinafter, the details of the present invention will be described.

[0009] <Component A: Polycarbonate Resin> The polycarbonate resin used as Component A of the present invention is obtained by reacting a dihydric phenol with a carbonate precursor. Examples of the reaction method include interfacial polymerization method, melt transesterification method, solid-phase transesterification method of carbonate prepolymer, and ring-opening polymerization method of cyclic carbonate compound, etc.

[0010] Typical examples of divalent phenols used here include hydroquinone, resorcinol, 4,4'-biphenol, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A), 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 2,2-bis(4-hydroxyphenyl)pentane, and 4,4'-(p-phenyl Examples include bis(4-hydroxyphenyl)diphenol, 4,4'-(m-phenylenediisopropylidene)diphenol, 1,1-bis(4-hydroxyphenyl)-4-isopropylcyclohexane, bis(4-hydroxyphenyl)oxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)ketone, bis(4-hydroxyphenyl)ester, bis(4-hydroxy-3-methylphenyl)sulfide, 9,9-bis(4-hydroxyphenyl)fluorene, and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene. Preferred divalent phenols are bis(4-hydroxyphenyl)alkanes, among which bisphenol A is particularly preferred and widely used in terms of impact resistance.

[0011] The polycarbonate resin of the present invention may further contain other copolymerization units, as long as they do not impair the effects of the present invention.

[0012] Examples of dihydroxy compounds that induce other copolymerization units include hydroquinone, resorcinol, orsinol, 2,2-bis(4-hydroxyphenyl)norbornene, 1,3-bis(4-hydroxyphenyl)adamantane, 2,2-bis(4-hydroxyphenyl)adamantane, 1,3-bis(4-hydroxyphenyl)-5,7-dimethyladamantane, 10,10-bis(4-hydroxyphenyl)-9-antrone, and 1,5-bis(4-hydroxyphenylthio)-2,3-dioxapentaenebisphenoxyethanolfluorene.

[0013] Diol compounds that induce other copolymerization units include isosorbide:1,4:3,6-dianhydro-D-sorbitol, tricyclodecanedimethanol (TCDDM), 4,8-bis(hydroxymethyl)tricyclodecane, tetramethylcyclobutanediol (TMCBD), 2,2,4,4-tetramethylcyclobutane-1,3-diol, mixed isomers, cis / trans-1,4-cyclohexanedimethanol (CHDM), cis / trans-1,4-bis(hydroxymethyl)cyclohexane, and cyclohex-1,4-yl Examples include dicyclodimethanol, trans-1,4-cyclohexanedimethanol (tCHDM), trans-1,4-bis(hydroxymethyl)cyclohexane, cis-1,4-cyclohexanedimethanol (cCHDM), cis-1,4-bis(hydroxymethyl)cyclohexane, cis-1,2-cyclohexanedimethanol, 1,1'-bi(cyclohexyl)-4,4'-diol, spiroglycol, dicyclohexyl-4,4'-diol, 4,4'-dihydroxybicyclohexyl, and poly(ethylene glycol).

[0014] Carbonyl halides, diester carbonates, or haloformates are used as carbonate precursors, specifically including phosgene, diphenyl carbonate, or dihaloformates of divalent phenols.

[0015] When producing a polycarbonate resin by interfacial polymerization of the divalent phenol and the carbonate precursor, a catalyst, an end-terminating agent, an antioxidant to prevent oxidation of the divalent phenol, etc., may be used as needed. The polycarbonate resin of the present invention also includes a branched polycarbonate resin copolymerized with a trifunctional or polyfunctional aromatic compound, a polyester carbonate resin copolymerized with an aromatic or aliphatic (including alicyclic) bifunctional carboxylic acid, a copolymerized polycarbonate resin copolymerized with a bifunctional alcohol (including alicyclic), and a polyester carbonate resin copolymerized with both such bifunctional carboxylic acid and bifunctional alcohol. Furthermore, a mixture of two or more of the obtained polycarbonate resins may also be used.

[0016] Branched polycarbonate resins can impart properties such as drip prevention to the polycarbonate resin composition of the present invention. Examples of trifunctional or polyfunctional aromatic compounds used in such branched polycarbonate resins include phloroglucin, phloroglucides, or 4,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)heptene-2, 2,4,6-trimethyl-2,4,6-tris(4-hydroxyphenyl)heptane, 1,3,5-tris(4-hydroxyphenyl)benzene, 1,1,1-tris(4-hydroxyphenyl)ethane, 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane, 2,6-bis(2-hydroxy-5-methylbenzyl)-4-methylphenol, and 4-{4-[1,1-bis(4- Examples include trisphenols such as hydroxyphenyl)ethyl]benzene}-α,α-dimethylbenzylphenol, tetra(4-hydroxyphenyl)methane, bis(2,4-dihydroxyphenyl)ketone, 1,4-bis(4,4-dihydroxytriphenylmethyl)benzene, or trimellitic acid, pyromellitic acid, benzophenonetetracarboxylic acid and their acid chlorides, among which 1,1,1-tris(4-hydroxyphenyl)ethane and 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane are preferred, and 1,1,1-tris(4-hydroxyphenyl)ethane is particularly preferred.

[0017] In the production of the polycarbonate resin composition of the present invention, the amount of terminal OH groups in the polycarbonate resin is preferably 0.35% or more, more preferably 0.40% or more, still more preferably 0.45% or more, and particularly preferably 0.45% or more and 5.0% or less. When the amount of terminal OH groups is less than 0.35%, good flexural strength may not be obtained. On the other hand, when the amount of terminal OH groups is 5.0% or more, the thermal stability may decrease. The amount of terminal OH groups is measured according to the method described in the examples.

[0018] In the production of the polycarbonate resin composition of the present invention, the polycarbonate resin may be a recycled polycarbonate resin. By using a recycled polycarbonate resin, it becomes possible to provide a composition with reduced environmental impact. The recycled polycarbonate resin is derived from materials such as bottles, discs, pachinko machines, sheets, and semiconductor transport containers.

[0019] <Component B: Carbon fiber> The carbon fiber used as the component B of the present invention has a coefficient of variation in number-average fiber length of 0.4 or more, preferably 0.4 to 1.0, and more preferably 0.4 to 0.8. When the coefficient of variation in number-average fiber length is less than 0.4, the improvement in flexural strength and notchless Charpy impact strength is insufficient. On the other hand, when it exceeds 1.0, the supply of carbon fiber becomes unstable during melt-kneading, and thus the carbon fiber content in the resin composition may become non-uniform. The coefficient of variation in number-average fiber length is measured according to the method described in the examples.

[0020] The content of component B is 5 to 100 parts by weight, preferably 5 to 80 parts by weight, more preferably 5 to 60 parts by weight, still more preferably 5 to 50 parts by weight, and particularly preferably 5 to 40 parts by weight with respect to 100 parts by weight of component A. When the content of component B is less than 5 parts by weight, good flexural strength and flexural modulus cannot be obtained. On the other hand, when it exceeds 100 parts by weight, the strands during melt-kneading become unstable, resulting in deteriorated productivity.

[0021] The carbon fiber used as component B of the present invention preferably has a sizing agent attached thereto, more preferably the attached amount of the sizing agent is 0.5 to 5.0% by weight, and even more preferably 1.0 to 3.0% by weight. If the attached amount of the sizing agent is less than 0.5% by weight, productivity or molding processability may decrease, and if it exceeds 5.0% by weight, mold deposit properties may deteriorate.

[0022] In producing the polycarbonate resin composition of the present invention, the carbon fiber is preferably recycled carbon fiber, more preferably carbon fiber obtained by recycling market return products of molded articles made of the polycarbonate resin composition, carbon fiber obtained by recycling process end materials during the production of molded articles made of the polycarbonate resin composition, and carbon fiber obtained by recycling process end materials during the production of carbon fiber, and even more preferably carbon fiber obtained by recycling process end materials during the production of molded articles made of the polycarbonate resin composition and carbon fiber obtained by recycling process end materials during the production of carbon fiber, and particularly preferably carbon fiber obtained by recycling process end materials during the production of carbon fiber. By using recycled carbon fiber, it becomes possible to provide a composition with reduced environmental impact.

[0023] <Component C: Phosphorus-based stabilizer> In the polycarbonate resin composition of the present invention, from the viewpoints of heat resistance and molding stability, it is preferable to use a phosphorus-based stabilizer within a range that does not impair the object of the present invention.

[0024] As phosphorus-based stabilizers, 3,9-bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane, 3,9-bis(2,6-ditatobutyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane, 2,2'-methylenebis(4,6-ditatobutylphenyl)2-ethylhexyl phosphite, tris(2,4-ditatobutylphenyl) phosphite, tris(nonylphenyl) phosphite, tetra-C12-C15-alkyl(propane N-2,2-diylbis(4,1-phenylene))bisphosphite, 2-ethylhexyldiphenylphosphite, isodecyldiphenylphosphite, triisodecylphosphite, triphenylphosphite, ethyl acid phosphate, butyl acid phosphate, butoxyethyl acid phosphate, 2-ethylhexyl acid phosphate, alkyl (C12,C14,C16,C18) acid phosphate, isotridecyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, Diylene glycol acid phosphate, 2-hydroxyethyl methacrylate acid phosphate, dibutyl phosphate, bis(2-ethylhexyl) phosphate, ethyl diethyl phosphonoacetate, dibutylbutyl phosphonate, dimethyl octadecyl phosphonate, dimethylmethyl phosphonate, diethyl hydroxymethyl phosphonate, diethylphenyl phosphonate, diethylphosphonoacetic acid, diethyl(p-methylbenzyl) phosphonate, diethylbenzyl phosphonate, diethyl(p-chlorobenzyl) phosphonate, diethyl Examples include tyloctadecylphosphonate, diethyl(3,5-di-t-butyl-4-hydroxybenzyl)phosphonate, nitrilotris(methylenephosphonic acid), triphenylphosphine, and stearyl acid phosphate zinc salt, as well as 3,9-bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane, 3,9-bis(2,6-ditatobutyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane, and 2,2'-methylenebis(4,6-Ditert-butylphenyl) 2-ethylhexyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris (nonylphenyl) phosphite, ethyl diethyl phosphonoacetate, dibutyl butyl phosphonate, dimethyl octadecyl phosphonate, dimethyl methyl phosphonate, diethyl hydroxymethyl phosphonate, diethyl phenyl phosphonate, diethyl phosphonoacetic acid, diethyl (p-methylbenzyl) phosphonate, diethyl benzyl phosphonate, diethyl (p-chlorobenzyl) phosphonate, diethyl octadecyl phosphonate, diethyl (3,5-di-t-butyl-4-hydroxybenzyl) phosphonate, nitrilotris (methylene phosphonic acid), triphenylphosphine, zinc stearyl acid phosphate are preferred, and ethyl diethyl phosphonoacetate, dibutyl butyl phosphonate, dimethyl octadecyl phosphonate, dimethyl methyl phosphonate, diethyl hydroxymethyl phosphonate, diethyl phenyl phosphonate, diethyl phosphonoacetic acid, diethyl (p-methylbenzyl) phosphonate, diethyl benzyl phosphonate, diethyl (p-chlorobenzyl) phosphonate, diethyl octadecyl phosphonate, diethyl (3,5-di-t-butyl-4-hydroxybenzyl) phosphonate, nitrilotris (methylene phosphonic acid), triphenylphosphine, zinc stearyl acid phosphate are more preferred.,

[0025] The content of Component C is preferably 0.001 to 1.0 parts by weight, more preferably 0.005 to 0.5 parts by weight, and even more preferably 0.01 to 0.5 parts by weight with respect to 100 parts by weight of Component A. If the content of Component C is less than 0.001 parts by weight, the thermal stability may be insufficient. On the other hand, if it exceeds 1.0 parts by weight, the mechanical properties may deteriorate.,

[0026] <Component D: Release agent> In the polycarbonate resin composition of the present invention, from the viewpoint of improving the mold release property from the mold during melt molding, it is preferable to use a release agent within a range that does not impair the object of the present invention.,

[0027] Examples of mold release agents include olefin waxes, olefin waxes containing carboxyl groups and / or carboxylic acid anhydride groups, silicone oils, organopolysiloxanes, higher fatty acid esters of monohydric or polyhydric alcohols, paraffin waxes, and beeswax.

[0028] The content of component D is preferably 0.01 to 10 parts by weight, more preferably 0.05 to 10 parts by weight, and even more preferably 0.05 to 5 parts by weight, per 100 parts by weight of component A. If the content of component D is less than 0.01 parts by weight, the release properties from the mold during injection molding may be insufficient, while if it exceeds 10 parts by weight, the mechanical properties may deteriorate.

[0029] <Other ingredients> The polycarbonate resin composition of the present invention may contain, to the extent that it does not impair the objectives of the present invention, heat stabilizers other than component C, ultraviolet absorbers, bluing agents, antistatic agents, flame retardants, heat shielding agents, fluorescent dyes (including fluorescent whitening agents), colorants, pigments, light diffusing agents, reinforcing fillers, sliding modifiers, and other resins and elastomers.

[0030] <Method for producing polycarbonate resin composition> In the present invention, it is preferable to blend components A and B in a molten state in the polycarbonate resin composition. As a method of blending in a molten state, an extruder is generally used, and it is preferable to knead and pelletize at a molten resin temperature of 200 to 400°C. This yields a polycarbonate resin composition in which components A and B are uniformly blended. The configuration of the extruder and the screw configuration are not particularly limited.

[0031] (Bending strength) In the present invention, the flexural strength of the polycarbonate resin composition is preferably greater than that of a polycarbonate resin composition in which component B is carbon fiber with a number-average fiber length variation coefficient of less than 0.4. The flexural strength is measured according to ISO 178 using an 80 mm × 10 mm × 4 mm thick flat test specimen molded from the polycarbonate resin composition.

[0032] (Charpy impact strength (without notch, with notch)) In the present invention, the Charpy impact strength (without notches and with notches) of the polycarbonate resin composition is preferably equal to or greater than that of a polycarbonate resin composition in which component B is carbon fiber with a number-average fiber length variation coefficient of less than 0.4. The Charpy impact strength (without notches and with notches) is measured in accordance with ISO 179 using an 80 mm × 10 mm × 4 mm thick flat test piece molded from the polycarbonate resin composition. [Examples]

[0033] The present invention will be described in more detail below with reference to examples, but these examples are not intended to limit the present invention. The evaluation was carried out according to the following method. (1) Terminal OH group amount (%) 40 mg of polycarbonate resin was dissolved in 0.6 mL of deuterated chloroform, and the amount of terminal OH groups was calculated from the integral ratio of the constituent units and terminal OH groups using proton NMR with a JEOL JNM-AL400.

[0034] (2) Number-average coefficient of variation of fiber length Several grams of polycarbonate resin composition were weighed and dissolved in dichloromethane. The carbon fibers were then filtered and separated. The separated carbon fibers were suspended in water, and the length of 5000 fibers was measured using a JASCO International SC-2micro analyzer. The number-average fiber length and standard deviation of the fiber length were then calculated. Using these values, the coefficient of variation of the number-average fiber length was calculated using the following formula. (Coefficient of variation of number-mean fiber length) = (Standard deviation of fiber length) / (Number-mean fiber length)

[0035] (3) Bending strength and flexural modulus Using 80mm x 10mm x 4mm thick flat test specimens molded from polycarbonate resin compositions, bending tests were conducted according to ISO 178 to measure bending strength and bending modulus. Furthermore, based on the bending strength measurement results, the ratio of bending strength to the comparison was calculated. Specifically, Examples 1-5 were compared with Comparative Example 1, Examples 6-10 with Comparative Example 2, Examples 11-16 with Comparative Example 3, Examples 17-22 with Comparative Example 4, and Examples 23-27 with Comparative Example 5. When the bending strength of the comparison target was set to 100, the relative value of each bending strength was used as the ratio of bending strength.

[0036] (4) Charpy impact strength Using 80mm x 10mm x 4mm thick flat test specimens molded from polycarbonate resin compositions, the Charpy impact strength (with and without notches) at 23°C was measured according to ISO 179. Furthermore, based on the Charpy impact strength measurement results, the ratio of the Charpy impact strength (without notches) to the comparison was calculated. Specifically, Examples 1-5 were compared with Comparative Example 1, Examples 6-10 with Comparative Example 2, Examples 11-16 with Comparative Example 3, Examples 17-22 with Comparative Example 4, and Examples 23-27 with Comparative Example 5. When the Charpy impact strength (without notches) of the comparison target was set to 100, the relative value of each Charpy impact strength (without notches) was defined as the ratio of the Charpy impact strength.

[0037] [Examples 1-4, 6-9, 11-15, 17-21, 23-27, Comparative Examples 1-7] Each component other than the carbon fiber, as shown in Tables 1 to 6, was weighed and uniformly mixed using a tumbler. A polycarbonate resin composition was prepared by feeding this mixture through the main feeder of an extruder and the carbon fiber through the side feeder. The extruder used was a vented twin-screw extruder, model TEX-30XSST, manufactured by Japan Steel Works Ltd. (fully meshed, co-rotating, double-threaded screw). The extrusion conditions were a discharge rate of 20 kg / h, a screw rotation speed of 180 rpm, and a vent vacuum of 3 kPa. The extrusion was performed at an extrusion temperature of 280°C.

[0038] [Examples 5, 10, 16, 22] Each component other than the carbon fiber, as shown in Tables 1 to 4, was weighed and uniformly mixed using a tumbler. A polycarbonate resin composition was prepared by feeding this mixture through the main feeder of an extruder and the carbon fiber through the side feeder. The extruder used was a vented twin-screw extruder, model TEX-30XSST, manufactured by Japan Steel Works Ltd. (fully meshed, co-rotating, double-threaded screw). The extrusion conditions were a discharge rate of 15 kg / h, a screw rotation speed of 150 rpm, and a vent vacuum of 3 kPa. The extrusion was performed at an extrusion temperature of 300°C.

[0039] The components of the compositions shown in Tables 1 to 6 are as follows: (Component A: Polycarbonate resin) A-1: Aromatic polycarbonate resin (manufactured by Teijin Limited; a polycarbonate resin polymerized from bisphenol A and phosgene by interfacial polymerization, with a viscosity-average molecular weight of 19,700 and a terminal OH group content of 0.25%). A-2: Recycled polycarbonate resin (polycarbonate resin with a viscosity-average molecular weight of 20,500 and terminal OH group content of 1.0%, obtained by recycling polycarbonate headlamp lenses) (Component B: Carbon fiber) B-1: HT C422 (manufactured by Teijin Limited, virgin carbon fiber) B-2: DSZ6-PA3(2) (Manufactured by Varetga Inc., carbon fiber obtained by recycling process scraps from carbon fiber manufacturing) (Component C: Phosphorus-based stabilizer) C-1: JC-224 (manufactured by Johoku Chemical Industry Co., Ltd., ethyl diethyl phosphonoacetate) (Component D: Release agent) D-1: HW405MP (Manufactured by Mitsui Chemicals, Inc., polyethylene wax) (Other ingredients) E-1: ROYAL BLACKRB90003S (Manufactured by Koshigaya Kasei, polystyrene resin master containing 50% carbon black)

[0040] [Table 1]

[0041] [Table 2]

[0042] [Table 3]

[0043] [Table 4]

[0044] [Table 5]

[0045] [Table 6] [Industrial applicability]

[0046] The polycarbonate resin composition and molded articles made therefrom of the present invention possess high strength and rigidity, and excellent impact resistance, making them particularly suitable for use in camera components, laptop computer components, mobile phone components, and the like.

Claims

1. A polycarbonate resin composition comprising (A) 100 parts by weight of polycarbonate resin (component A) and (B) 5 to 100 parts by weight of carbon fibers (component B) having a number-average fiber length variation coefficient of 0.4 or more.

2. The polycarbonate resin composition according to claim 1, wherein component A is a polycarbonate resin having a terminal OH group content of 0.35% or more.

3. The polycarbonate resin composition according to claim 1 or 2, wherein component B is carbon fiber obtained by recycling process scraps from the production of carbon fiber.

4. The polycarbonate resin composition according to claim 1 or 2, comprising 0.001 to 1.0 parts by weight of (C) a phosphorus-based stabilizer (component C) per 100 parts by weight of component A.

5. The polycarbonate resin composition according to claim 1 or 2, comprising 0.01 to 10 parts by weight of (D) mold release agent (component D) per 100 parts by weight of component A.

6. The polycarbonate resin composition according to claim 1 or 2, wherein the flexural strength of the polycarbonate resin composition according to claim 1 is greater than the flexural strength of the polycarbonate resin composition in which component B is carbon fiber with a number-average fiber length variation coefficient of less than 0.

4.

7. A polycarbonate resin composition according to claim 1 or 2, wherein the notched Charpy impact strength of the polycarbonate resin composition according to claim 1 is equal to or greater than that of a polycarbonate resin composition in which component B is carbon fiber with a number-average fiber length variation coefficient of less than 0.

4.

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

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