Polycarbonate resin composition and molded article comprising same

Abstract

The present invention provides a polycarbonate resin composition containing carbon fibers that have high strength and rigidity, and excellent impact resistance, flame retardancy, and flowability. This polycarbonate resin composition contains 5 to 100 parts by weight of (B) carbon fibers (component B) having a number average fiber length variation coefficient of 0.4 or more relative to 100 parts by weight of (A) a polycarbonate resin (component A).

Description

Polycarbonate resin composition and molded article made therefrom

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

[0002] Polycarbonate resin is used as an engineering plastic in a wide range of fields, including electrical and electronic equipment housings, automotive interior and exterior parts, building materials, furniture, musical instruments, and general merchandise, due to its excellent transparency, impact resistance, heat resistance, and dimensional stability. In particular, polycarbonate resin compositions containing carbon fibers are used in camera parts, laptop computer parts, and mobile phone parts because of their excellent mechanical properties, impact resistance, dimensional stability, and conductivity (for example, Patent Document 1). To improve the mechanical properties of polycarbonate resin compositions containing carbon fibers, the carbon fiber content can be increased, but this increases strength and rigidity but decreases impact resistance. On the other hand, it has been disclosed that high flame retardancy can be obtained by adding a flame retardant to a polycarbonate resin composition containing carbon fibers (for example, Patent Document 2). However, these polycarbonate resin compositions exhibit high flame retardancy but suffer from reduced mechanical properties. Furthermore, from the perspective of effectively utilizing limited resources, there is a desire for the development of materials using recycled carbon fibers recovered from scraps generated during carbon fiber manufacturing.

[0003] Japanese Patent Publication No. 2001-49109 Japanese Patent Publication No. 2022-139199

[0004] The object of the present invention is to provide a polycarbonate resin composition and a molded article made therefrom that has high strength and rigidity, impact resistance, and preferably flame retardancy and fluidity.

[0005] The inventors of the present invention have conducted extensive research to achieve the above objectives and have found that a polycarbonate resin composition containing carbon fibers having a specific coefficient of variation in fiber length, and further containing a phosphorus-based flame retardant or a metal salt-based flame retardant, and a molded article made therefrom, can solve the above objectives, leading to the present invention. That is, according to the present invention, items 1 to 17 below 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 fiber (component B) having a number-average fiber length coefficient of variation of 0.4 or more. 2. The polycarbonate resin composition according to item 1, further comprising (C) 1 to 50 parts by weight of phosphorus-based flame retardant (component C) per 100 parts by weight of component A. 3. The polycarbonate resin composition according to item 1, further comprising (D) 0.01 to 2 parts by weight of metal salt-based flame retardant (component D) per 100 parts by weight of component A. 4. The polycarbonate resin composition according to any one of items 1 to 3, wherein component A is a polycarbonate resin having a terminal OH group content of 0.35% or more. 5. The polycarbonate resin composition according to any one of items 1 to 4, wherein component B is carbon fiber obtained by recycling process scraps from carbon fiber manufacturing. 6. 10. A polycarbonate resin composition according to any one of items 1 to 5 above, comprising 0.001 to 1.0 parts by weight of (E) phosphorus-based stabilizer (component E) per 100 parts by weight of component A. 7. A polycarbonate resin composition according to any one of items 1 to 6 above, comprising 0.01 to 10 parts by weight of (F) mold release agent (component F) per 100 parts by weight of component A. 8. A polycarbonate resin composition according to item 2 or 3 above, comprising 0.01 to 50 parts by weight of (G) drip prevention agent (component G) per 100 parts by weight of component A. 9. A polycarbonate resin composition according to item 2 above, comprising 0.01 to 50 parts by weight of (H) silicone-based compound (component H) per 100 parts by weight of component A. 10. A polycarbonate resin composition according to item 2 above, comprising 0.1 to 100 parts by weight of (I) inorganic filler (component I) per 100 parts by weight of component A. 11. The polycarbonate resin composition according to item 2 above, comprising 0.01 to 50 parts by weight of (J) compatibilizer (component J) per 100 parts by weight of component A. 12. The polycarbonate resin composition according to item 1 above, having the same constituent components and amounts, but having a greater bending strength than the polycarbonate resin composition in which the number-average fiber length variation coefficient of the carbon fibers (component B) is less than 0.4. 13. The polycarbonate resin composition according to item 1 above, having the same constituent components and amounts, but having a notched Charpy impact strength equal to or greater than the notched Charpy impact strength of the polycarbonate resin composition in which the number-average fiber length variation coefficient of the carbon fibers (component B) is less than 0.4.14. A polycarbonate resin composition according to item 2, wherein the constituent components and quantities are the same, but the coefficient of variation of the number-average fiber length of the carbon fibers that constitute component B is less than 0.4, and the polycarbonate resin composition has a greater flexural modulus than that of the polycarbonate resin composition according to item 3, wherein the constituent components and quantities are the same, but the coefficient of variation of the number-average fiber length of the carbon fibers that constitute component B is less than 0.4, and the polycarbonate resin composition has a greater fluidity than that of the polycarbonate resin composition according to item 3, wherein the constituent components and quantities are the same, but the coefficient of variation of the number-average fiber length of the carbon fibers that constitute component B is less than 0.4. 16. A polycarbonate resin composition according to item 2 or 3, wherein the flame retardancy of a molded article with a thickness of 0.8 mm measured according to the UL94 standard is V-2 or higher. 17. A molded article made from the polycarbonate resin composition according to any one of items 1 to 16.

[0007] The polycarbonate resin composition and molded articles made therefrom of the present invention possess high strength and rigidity, as well as excellent impact resistance, flame retardancy, and fluidity, making them particularly suitable for use as camera components, laptop computer components, and mobile phone components. Therefore, the industrial benefits they provide are exceptional.

[0008] The details of the present invention will be described below.

[0009] <Component A: Polycarbonate Resin> The polycarbonate resin used as component A in this invention is obtained by reacting a divalent phenol with a carbonate precursor. Examples of reaction methods include interfacial polymerization, molten transesterification, solid-phase transesterification of carbonate prepolymers, and ring-opening polymerization of cyclic carbonate compounds.

[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] Other diol compounds that induce 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-ylu- 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 producing 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, even more preferably 0.45% or more, and particularly preferably 0.45% to 5.0%. If the amount of terminal OH groups is less than 0.35%, good flexural strength may not be obtained. On the other hand, if the amount of terminal OH groups is 5.0% or more, thermal stability may decrease. The amount of terminal OH groups is measured according to the method described in the examples.

[0018] In manufacturing the polycarbonate resin composition of the present invention, the polycarbonate resin may be recycled polycarbonate resin. By using recycled polycarbonate resin, it becomes possible to provide a composition with reduced environmental impact. Recycled polycarbonate resin can be derived from bottles, discs, pachinko machines, sheets, semiconductor transport containers, etc.

[0019] <Component B: Carbon Fiber> The carbon fiber used as component B of the present invention has a number-average coefficient of variation of fiber length of 0.4 or more, preferably between 0.4 and 1.0, and more preferably between 0.4 and 0.8. If the number-average coefficient of variation of fiber length is less than 0.4, the balance between strength and toughness is not maintained due to the uneven distribution of fiber length, resulting in insufficient improvement in bending strength and notch-free Charpy impact strength. On the other hand, if it exceeds 1.0, the supply of carbon fiber is not stable during melt-mixing, which may result in uneven carbon fiber content in the resin composition. The number-average coefficient of variation of 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, even more preferably 5 to 50 parts by weight, and particularly preferably 5 to 40 parts by weight, per 100 parts by weight of component A. If the content of component B is less than 5 parts by weight, good bending strength and bending modulus cannot be obtained, while if it exceeds 100 parts by weight, the strand will not be stable during melt mixing, resulting in poor productivity.

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

[0022] In producing the polycarbonate resin composition of the present invention, the carbon fibers are preferably recycled carbon fibers, more preferably recycled carbon fibers obtained from market-recovered molded articles made of the polycarbonate resin composition, more preferably recycled carbon fibers obtained from process scraps during the production of molded articles made of the polycarbonate resin composition, and more preferably recycled carbon fibers obtained from process scraps during the production of carbon fibers, and even more preferably recycled carbon fibers obtained from process scraps during the production of molded articles made of the polycarbonate resin composition, and more preferably recycled carbon fibers obtained from process scraps during the production of carbon fibers. By using recycled carbon fibers, it becomes possible to provide a composition with reduced environmental impact.

[0023] <Component C: Phosphorus-based flame retardant> The polycarbonate resin composition of the present invention may contain a phosphorus-based flame retardant (component C). The content of component C is preferably 1 to 50 parts by weight, more preferably 1 to 45 parts by weight, even more preferably 1 to 40 parts by weight, particularly preferably 5 to 40 parts by weight, and most preferably 5 to 35 parts by weight, per 100 parts by weight of component A. If the content of component C is less than 1 part by weight, the improvement in flame retardancy is insufficient, and if it exceeds 50 parts by weight, the heat resistance may deteriorate.

[0024] Examples of phosphorus-based flame retardants used as component C include phosphate ester flame retardants, red phosphorus flame retardants, and phosphazenes. Among these, phosphate ester flame retardants and phosphazenes are preferred, with phosphate ester flame retardants being more preferred. Examples of phosphate ester-based flame retardants include cresyl diphenyl phosphate, tricresyl phosphate, triphenyl phosphate, trixylenyl phosphate, cresyl di-2,6-xylenyl phosphate, resorcinol-bis(diphenyl phosphate), bisphenol A-bis(diphenyl phosphate), and 1,3-phenylene-bis(2,6-dimethylphenyl phosphate). These may be oligomers with approximately 2 to 20 repeating units or polymers with 20 or more repeating units that contain cresyl diphenyl phosphate, tricresyl phosphate, triphenyl phosphate, trixylenyl phosphate, cresyl di-2,6-xylenyl phosphate, resorcinol-bis(diphenyl phosphate), bisphenol A-bis(diphenyl phosphate), 1,3-phenylene-bis(2,6-dimethylphenyl phosphate), etc., as constituent components.

[0025] <Component D: Metal Salt Flame Retardant> The polycarbonate resin composition of the present invention may contain a metal salt flame retardant (Component D). The content of Component D is preferably 0.01 to 2 parts by weight, more preferably 0.05 to 2 parts by weight, even more preferably 0.05 to 1 part by weight, and particularly preferably 0.05 to 0.5 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 improvement in flame retardancy is insufficient, and if it exceeds 2 parts by weight, the flame retardancy and impact resistance may deteriorate.

[0026] Examples of metal salt-based flame retardants include metal salts of organic sulfonic acids and metal salts of phosphinates, with metal salts of organic sulfonic acids being preferred. Examples of metal salts of organic sulfonic acids include lithium alkyl sulfonate having 1 to 50 carbon atoms, sodium alkyl sulfonate having 1 to 50 carbon atoms, potassium alkyl sulfonate having 1 to 50 carbon atoms, lithium aralkyl sulfonate having 6 to 60 carbon atoms, sodium aralkyl sulfonate having 6 to 60 carbon atoms, potassium aralkyl sulfonate having 6 to 60 carbon atoms, lithium perfluoroalkanesulfonate having 1 to 50 carbon atoms, sodium perfluoroalkanesulfonate having 1 to 50 carbon atoms, and perfluoroalkanesulfonate having 1 to 50 carbon atoms. Potassium bis(alkylsulfone)imide lithium with 2 to 100 carbon atoms, sodium bis(alkylsulfone)imide with 2 to 100 carbon atoms, potassium bis(alkylsulfone)imide with 2 to 100 carbon atoms, lithium bis(aralkylsulfone)imide with 12 to 120 carbon atoms, sodium bis(aralkylsulfone)imide with 12 to 120 carbon atoms, potassium bis(aralkylsulfone)imide with 12 to 120 carbon atoms, lithium bis(perfluoroalkylsulfone)imide with 2 to 100 carbon atoms, 2 to 100 bis(perfluoroalkylsulfone)imide sodium, 2-100 bis(perfluoroalkylsulfone)imide potassium, lithium diphenylsulfonate, sodium diphenylsulfonate, potassium diphenylsulfonate, dilithium diphenylsulfonate, disodium diphenylsulfonate, dipotassium diphenylsulfonate, lithium polystyrenesulfonate, sodium polystyrenesulfonate, potassium polystyrenesulfonate, lithium alkylnaphthalenesulfonate (10-100 carbon atoms), sodium alkylnaphthalenesulfonate (10-100 carbon atoms), potassium alkylnaphthalenesulfonate (10-100 carbon atoms), lithium alkyldiphenylethersulfonate (12-100 carbon atoms), sodium alkyldiphenylethersulfonate (12-100 carbon atoms), potassium alkyldiphenylethersulfonate (12-100 carbon atoms), lithium alkyldiphenylethersulfonate (12-100 carbon atoms),Examples include sodium alkyldiphenyl ether disulfonate with 12 to 100 carbon atoms, potassium alkyldiphenyl ether disulfonate with 12 to 100 carbon atoms, lithium benzenesulfonate formalin condensate, sodium benzenesulfonate formalin condensate, potassium benzenesulfonate formalin condensate, lithium naphthalenesulfonate formalin condensate, sodium naphthalenesulfonate formalin condensate, potassium naphthalenesulfonate formalin condensate, sodium alkylsulfonate with 1 to 50 carbon atoms, and alkylsulfonate with 1 to 50 carbon atoms. Potassium sulfonate, sodium aralkylsulfonate with 6-60 carbon atoms, potassium aralkylsulfonate with 6-60 carbon atoms, sodium perfluoroalkanesulfonate with 1-50 carbon atoms, potassium perfluoroalkanesulfonate with 1-50 carbon atoms, lithium bis(alkylsulfone)imide with 2-100 carbon atoms, sodium bis(alkylsulfone)imide with 2-100 carbon atoms, potassium bis(alkylsulfone)imide with 2-100 carbon atoms, lithium bis(aralkylsulfone)imide with 12-120 carbon atoms, bis(aralkyl Sodium bis(aralkylsulfone)imide, potassium bis(aralkylsulfone)imide with 12-120 carbon atoms, lithium bis(perfluoroalkylsulfone)imide with 2-100 carbon atoms, sodium bis(perfluoroalkylsulfone)imide with 2-100 carbon atoms, potassium bis(perfluoroalkylsulfone)imide with 2-100 carbon atoms, sodium diphenylsulfonate, potassium diphenylsulfonate, disodium diphenylsulfonate, dipotassium diphenylsulfonate, sodium polystyrenesulfonate Um, potassium polystyrene sulfonate, sodium alkylnaphthalene sulfonate with 10 to 100 carbon atoms, potassium alkylnaphthalene sulfonate with 10 to 100 carbon atoms, sodium alkyldiphenyl ether sulfonate with 12 to 100 carbon atoms, potassium alkyldiphenyl ether sulfonate with 12 to 100 carbon atoms, lithium alkyldiphenyl ether disulfonate with 12 to 100 carbon atoms, sodium alkyldiphenyl ether disulfonate with 12 to 100 carbon atoms, potassium alkyldiphenyl ether disulfonate with 12 to 100 carbon atoms,Examples include sodium benzenesulfonate formalin condensate, potassium benzenesulfonate formalin condensate, sodium naphthalenesulfonate formalin condensate, and potassium naphthalenesulfonate formalin condensate, as well as sodium alkylsulfonate with 1 to 50 carbon atoms, potassium alkylsulfonate with 1 to 50 carbon atoms, sodium aralkylsulfonate with 6 to 60 carbon atoms, potassium aralkylsulfonate with 6 to 60 carbon atoms, sodium perfluoroalkanesulfonate with 1 to 50 carbon atoms, potassium perfluoroalkanesulfonate with 1 to 50 carbon atoms, lithium bis(alkylsulfone)imide with 2 to 100 carbon atoms, sodium bis(alkylsulfone)imide with 2 to 100 carbon atoms, potassium bis(alkylsulfone)imide with 2 to 100 carbon atoms, and C12 Preferably, bis(aralkylsulfone)imide lithium with up to 120 carbon atoms, bis(aralkylsulfone)imide sodium with 12 to 120 carbon atoms, bis(aralkylsulfone)imide potassium with 12 to 120 carbon atoms, bis(perfluoroalkylsulfone)imide lithium with 2 to 100 carbon atoms, bis(perfluoroalkylsulfone)imide sodium with 2 to 100 carbon atoms, bis(perfluoroalkylsulfone)imide potassium with 2 to 100 carbon atoms, diphenylsulfonesulfonate sodium, diphenylsulfonesulfonate potassium, disodium diphenylsulfonedisulfonate, dipotassium diphenylsulfonedisulfonate, alkylnaphthalenesulfonate sodium with 10 to 100 carbon atoms, and alkylnaphthalenesulfonate potassium with 10 to 100 carbon atoms are used.

[0027] <Component E: Phosphorus-based stabilizer> From the viewpoint of heat resistance and molding stability, it is preferable that a phosphorus-based stabilizer (Component E) is used in the polycarbonate resin composition of the present invention, to the extent that it does not impair the objectives of the present invention.

[0028] 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-ethylhexyl diphenyl phosphite, isodecyl diphenyl phosphite, triisodecyl phosphite, triphenyl phosphite, 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, ethyl hexyl 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, diethyl benzyl 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-Ditated butylphenyl) 2-ethylhexyl phosphite, Tris(2,4-Ditated 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(methylenephosphonic acid) Triphenylphosphine and stearyl acid phosphate zinc salt are preferred, and ethyl diethyl phosphonoacetate, dibutylbutyl phosphonate, dimethyl octadecyl phosphonate, dimethyl methyl phosphonate, diethyl hydroxymethyl phosphonate, diethylphenyl 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(methylenephosphonic acid), triphenylphosphine, and stearyl acid phosphate zinc salt are more preferred.

[0029] The content of component E 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, per 100 parts by weight of component A. If the content of component E is less than 0.001 parts by weight, the thermal stability may be insufficient, while if it exceeds 1.0 part by weight, the mechanical properties may deteriorate.

[0030] <Component F: Release Agent> From the viewpoint of improving release properties from the mold during melt molding, it is preferable that a release agent (Component F) is used in the polycarbonate resin composition of the present invention, to the extent that it does not impair the objective of the present invention.

[0031] Examples of the release agent include olefin wax, olefin wax containing a carboxyl group and / or carboxylic anhydride group, silicone oil, organopolysiloxane, higher fatty acid ester of monohydric or polyhydric alcohol, paraffin wax, beeswax, and the like.

[0032] The content of component F 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 with respect to 100 parts by weight of component A. When the content of component F is less than 0.01 part by weight, the mold release property from the mold during injection molding may be insufficient, while when it exceeds 10 parts by weight, the mechanical properties may deteriorate.

[0033] <G component: anti-dripping agent> From the viewpoint of flame retardancy, it is preferable that an anti-dripping agent (G component) is used in the polycarbonate resin composition of the present invention within a range not impairing the object of the present invention. The content of component G is preferably 0.01 to 50 parts by weight, more preferably 0.05 to 50 parts by weight, even more preferably 0.05 to 25 parts by weight, and particularly preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of component A. When the content of component G is less than 0.01 part by weight, the improvement in flame retardancy may be insufficient, and when it exceeds 50 parts by weight, the fluidity may deteriorate.

[0034] Examples of the anti-dripping agent used as component G include polytetrafluoroethylene (PTFE) and modified PTFE.

[0035] <H component: silicone-based compound> From the viewpoint of flame retardancy, it is preferable that a silicone-based compound (H component) is used in the polycarbonate resin composition of the present invention within a range not impairing the object of the present invention. The content of component H is preferably 0.01 to 50 parts by weight, more preferably 0.05 to 50 parts by weight, even more preferably 0.05 to 40 parts by weight, and particularly preferably 0.1 to 40 parts by weight with respect to 100 parts by weight of component A. When the content of component H is less than 0.01 part by weight, the improvement in flame retardancy may be insufficient, and when it exceeds 50 parts by weight, the mechanical properties may deteriorate.

[0036] Silicone compounds used as the H component include polyorganosiloxanes and polycarbonate-polyorganosiloxane copolymers. The polyorganosiloxane contains at least one structural unit selected from the group consisting of the following formula (1), and is an oligomer having about 2 to 20 repeating units or a polymer having 20 or more repeating units.

[0037]

[0038] (In formula (1), R １ , R ２ and R ３ each independently represent a hydrogen atom, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an aryl group having 6 to 15 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms.) The polycarbonate-polyorganosiloxane copolymer is a compound composed of a structural unit represented by the following formula (2) and a structural unit represented by the following formula (4).

[0039]

[0040] (In formula (2), R ４ , R ５ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, a and b each independently represent an integer of 1 to 4, and X is a single bond or at least one group selected from the group consisting of the following formula (3).)

[0041]

[0042] (In formula (3), R ６ , R ７ , R ８ , R ９ , R １０ , R １１ , R １２ and R １３ each independently represent at least one group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 14 carbon atoms, and an aralkyl group having 7 to 20 carbon atoms, R １４ and R１５ Each of these independently represents at least one group selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aralkyloxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group, and a carboxyl group. If there are multiple groups, they may be the same or different, and c is an integer from 1 to 10, and d is an integer from 4 to 7.

[0043]

[0044] (In formula (4), R １６ , R １７ , R １８ , R １９ , R ２０ , R ２１ , R ２２ and R ２３ Each of the following independently represents a hydrogen atom, a halogen atom, an alkyl group with 1 to 4 carbon atoms, an aryl group with 6 to 12 carbon atoms, an aralkyl group with 7 to 20 carbon atoms, an alkoxy group or vinyl group with 1 to 10 carbon atoms; Y and Z independently represent a single bond or a divalent aliphatic group with 1 to 10 carbon atoms; e and f independently represent an integer from 1 to 4; and g and h represent 0 or a natural number.

[0045] <Component I: Inorganic Filler> In the polycarbonate resin composition of the present invention, it is preferable to use an inorganic filler (Component I) to the extent that it does not impair the objectives of the present invention, from the viewpoint of flame retardancy and mechanical properties. The content of Component I is preferably 0.1 to 100 parts by weight, more preferably 0.5 to 100 parts by weight, even more preferably 0.5 to 80 parts by weight, and particularly preferably 1 to 80 parts by weight, per 100 parts by weight of Component A. If the content of Component I is less than 0.1 parts by weight, the improvement of flame retardancy and mechanical properties may be insufficient, and if it exceeds 100 parts by weight, the strand may not be stable during melt mixing, which may lead to a deterioration in productivity.

[0046] Examples of inorganic fillers include talc, mica, kaolin, clay, wollastonite, alumina, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, graphite, glass fiber, potassium titanate fiber, and metal fiber, with talc, mica, wollastonite, graphite, and glass fiber being preferred.

[0047] <Component J: Compatibilizer> From the viewpoint of mechanical properties, it is preferable that a compatibilizer (component J) be used in the polycarbonate resin composition of the present invention, to the extent that it does not impair the objective of the present invention. The content of component J is preferably 0.01 to 50 parts by weight, more preferably 0.01 to 40 parts by weight, even more preferably 0.01 to 30 parts by weight, and particularly preferably 0.05 to 30 parts by weight, per 100 parts by weight of component A. If the content of component J is less than 0.01 parts by weight, the improvement of mechanical properties may be insufficient, and if it exceeds 50 parts by weight, the flame retardancy may deteriorate.

[0048] Examples of compatibilizers include compounds having epoxy groups, oxazarin groups, oxazine groups, carboxyl groups, hydroxyl groups, ester bonds, carbodiimide bonds, urethane bonds, urea bonds, amide bonds, and imide bonds, with compounds having epoxy groups, oxazarin groups, oxazine groups, hydroxyl groups, ester bonds, carbodiimide bonds, urethane bonds, and imide bonds being preferred.

[0049] <Other Components> 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 E, ultraviolet absorbers, bluing agents, antistatic agents, flame retardants other than components C and D, heat shielding agents, fluorescent dyes (including fluorescent whitening agents), colorants, pigments, light diffusing agents, reinforcing fillers, sliding modifiers, and other resins and elastomers.

[0050] <Method for producing polycarbonate resin composition> In the present invention, it is preferable to blend component A, component B, and other necessary components in a molten state to produce the polycarbonate resin composition. As a method for blending in a molten state, an extruder is generally used, and it is preferable to knead and pelletize the mixture at a molten resin temperature of 200 to 400°C. This yields a polycarbonate resin composition in which component A, component B, and other necessary components are uniformly blended. The configuration of the extruder and the screw configuration are not particularly limited.

[0051] (Bending Strength) The bending strength of the polycarbonate resin composition in the present invention is preferably greater than that of a polycarbonate resin composition having the same constituent components and quantities, but in which the coefficient of variation of the number-average fiber length of the carbon fibers, which are component B, is less than 0.4. The bending strength is measured in accordance with ISO 178 using a flat test piece measuring 80 mm × 10 mm × 4 mm in thickness, molded from the polycarbonate resin composition.

[0052] (Charpy impact strength (without notch, with notch)) In the present invention, the Charpy impact strength (without notch, with notch) of the polycarbonate resin composition is preferably equal to or greater than that of a polycarbonate resin composition having the same constituent components and quantities, but in which the number-average fiber length variation coefficient of the carbon fibers, which are component B, is less than 0.4. The Charpy impact strength (without notch, with notch) is measured in accordance with ISO 179 using a flat test piece measuring 80 mm × 10 mm × 4 mm thick molded from the polycarbonate resin composition.

[0053] (Flexural Modulus) The flexural modulus of the polycarbonate resin composition in the present invention is preferably greater than that of a polycarbonate resin composition having the same constituent components and amounts, but in which the coefficient of variation of the number-average fiber length of the carbon fibers, which are component B, is less than 0.4. The flexural modulus is measured in accordance with ISO 178 using a flat test piece measuring 80 mm × 10 mm × 4 mm in thickness, molded from the polycarbonate resin composition.

[0054] (Fluidity) The fluidity of the polycarbonate resin composition in the present invention is preferably greater than that of a polycarbonate resin composition having the same constituent components and quantities, but in which the coefficient of variation of the number-average fiber length of the carbon fibers, which are component B, is less than 0.4. The fluidity was measured by injection molding the polycarbonate resin composition using an injection molding machine (Sumitomo Heavy Industries, Ltd., all-electric small injection molding machine SE130EV-A) with a channel thickness of 2 cm and a channel width of 8 mm, under the conditions of a cylinder temperature of 290°C, a mold temperature of 100°C, and an injection pressure of 118 MPa.

[0055] (Flame retardancy) In the present invention, the flame retardancy is preferably V-2 or higher for a molded article with a thickness of 0.8 mm. The flame retardancy is measured according to the UL94 standard using a test piece measuring 125 mm × 13 mm × 0.8 mm thick, molded from a polycarbonate resin composition.

[0056] The present invention will be described in more detail below with reference to examples, but these are not intended to limit the present invention. The evaluation was carried out according to the following method. (1) Amount of terminal OH groups (%) 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 constituent units and terminal OH groups using proton NMR with JEOL Ltd.'s JNM-AL400.

[0057] (2) Coefficient of Variation of Number-Average Fiber Length Several grams of polycarbonate resin composition were weighed and dissolved in dichloromethane. Then, only the contained carbon fibers were filtered and separated. The separated carbon fibers were suspended in water, and the length of 5,000 fibers of the suspension was measured using a JASCO International SC-2 micro, and the number-average fiber length and the standard deviation of the fiber length of the carbon fibers contained in the polycarbonate resin composition were calculated. Using these values, the coefficient of variation of number-average fiber length was calculated using the following formula: (Coefficient of Variation of Number-Average Fiber Length) = (Standard Deviation of Fiber Length) / (Number-Average Fiber Length)

[0058] (3) Bending strength and flexural modulus A flat plate test specimen measuring 80 mm × 10 mm × 4 mm in thickness, molded from a polycarbonate resin composition, was subjected to bending tests in accordance with ISO 178, and the bending strength and flexural modulus were measured. In addition, the ratio of bending strength to the comparison was calculated based on the measurement results of the bending strength. Specifically, Examples 1 to 5 were compared with Comparative Example 1, Examples 6 to 10 with Comparative Example 2, Examples 11 to 16 with Comparative Example 3, Examples 17 to 22 with Comparative Example 4, and Examples 23 to 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 taken as the ratio of bending strength. Furthermore, the ratio of flexural modulus to the comparison was calculated based on the measurement results of the flexural modulus. Specifically, Examples 28-30 were compared with Comparative Example 8, Examples 31-33 with Comparative Example 9, Examples 34-40 with Comparative Example 10, Examples 41-47 with Comparative Example 11, Examples 48-54 with Comparative Example 12, and Examples 55-58 with Comparative Example 13. When the flexural modulus of the comparison subjects was set to 100, the relative value of the flexural modulus of each was used as the ratio of the flexural strength.

[0059] (4) Charpy impact strength Using 80 mm × 10 mm × 4 mm thick flat test specimens molded from polycarbonate resin compositions, the Charpy impact strength (without notch and with notch) at 23°C was measured according to ISO 179. In addition, the ratio of the Charpy impact strength (without notch) to the comparison was calculated based on the measurement results of the Charpy impact strength. Specifically, Examples 1 to 5 were compared with Comparative Example 1, Examples 6 to 10 with Comparative Example 2, Examples 11 to 16 with Comparative Example 3, Examples 17 to 22 with Comparative Example 4, and Examples 23 to 27 with Comparative Example 5. When the Charpy impact strength (without notch) of the comparison target was set to 100, the relative value of each Charpy impact strength (without notch) was taken as the ratio of the Charpy impact strength.

[0060] (5) A 125 mm × 13 mm × 0.8 mm thick test specimen molded from a flame-retardant polycarbonate resin composition was subjected to a combustion test in accordance with the UL94 standard. Based on the test results, the specimens were evaluated as one of the following grades: V-0, V-1, V-2, or not-V.

[0061] (6) HDT A flat plate test specimen measuring 80 mm × 10 mm × 4 mm in thickness, molded from a polycarbonate resin composition, was used to measure the temperature of deflection under load (HDT) according to ISO 75-1. The test load was 1.80 MPa.

[0062] (7) The Archimedes spiral flow length of a flow channel with a thickness of 2 cm and a flow channel width of 8 mm was measured by injection molding a polycarbonate resin composition using an injection molding machine (Sumitomo Heavy Industries, Ltd., all-electric small injection molding machine SE130EV-A) under the conditions of cylinder temperature 290°C, mold temperature 100°C, and injection pressure 118 MPa. In addition, the ratio of flow to comparative examples was calculated based on the flow measurement results. Specifically, Examples 59 to 65 were compared with Comparative Example 16, Examples 66 to 72 with Comparative Example 17, Examples 73 to 82 with Comparative Example 18, Examples 83 to 92 with Comparative Example 19, and Examples 93 to 102 with Comparative Example 20. When the flow of the comparison target was set to 100, the relative value of the flow of each was taken as the ratio of flow.

[0063] [Examples 1-4, 6-9, 11-15, 17-21, 23-27, 28-38, 40-45, 47-52, 54-58, 59-62, 64-69, 71-77, 79-87, 89-97, 99-102, Comparative Examples 1-22] Each component other than carbon fiber, as shown in Tables 1-19, was weighed and uniformly mixed using a tumbler. A polycarbonate resin composition was prepared by feeding this mixture from the main feeder of an extruder and the carbon fiber from the side feeder. The extruder used was a vented twin-screw extruder manufactured by Japan Steel Works, Ltd.: TEX-30XSST (full meshing, co-direction rotation, double-thread screw). The extrusion conditions were a discharge rate of 20 kg / h, a screw rotation speed of 180 rpm, a vent vacuum of 3 kPa, and an extrusion temperature of 280°C.

[0064] [Examples 5, 10, 16, 22, 39, 46, 53, 63, 70, 78, 88, 98] Each component other than carbon fiber, as shown in Tables 1 to 19, was weighed and uniformly mixed using a tumbler. A polycarbonate resin composition was prepared by feeding this mixture from the main feeder of an extruder and the carbon fiber from the side feeder. The extruder used was a vented twin-screw extruder manufactured by Japan Steel Works Ltd.: TEX-30XSST (full meshing, co-direction rotation, double-thread screw). The extrusion conditions were a discharge rate of 15 kg / h, a screw rotation speed of 150 rpm, a vent vacuum of 3 kPa, and the extrusion temperature was 300°C.

[0065] The components of the compositions shown in Tables 1 to 19 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 (a polycarbonate resin obtained by recycling polycarbonate headlamp lenses, with a viscosity-average molecular weight of 20,500 and a terminal OH group content of 1.0%) A-3: 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 20,900 and a terminal OH group content of 0.20%) A-4: Recycled polycarbonate resin (a polycarbonate resin obtained by recycling polycarbonate headlamp lenses, with a viscosity-average molecular weight of 20,400 and a terminal OH group content of 1.2%)

[0066] (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)

[0067] (Component C: Phosphorus-based flame retardant) C-1: CR-741 (manufactured by Daihachi Chemical Industry Co., Ltd., bisphenol A-bis(diphenyl phosphate)) C-2: PX-200 (manufactured by Daihachi Chemical Industry Co., Ltd., 1,3-phenylene-bis(2,6-dimethylphenyl phosphate))

[0068] (Component D: Metal salt-based flame retardant) D-1: F-Top PFBS (manufactured by Mitsubishi Materials Corporation, potassium perfluorobutanesulfonate) D-2: KSS-FR (manufactured by AriChem Inc., potassium diphenylsulfonsulfonate)

[0069] (Component E: Phosphorus-based stabilizer) E-1: JC-224 (manufactured by Johoku Chemical Industry Co., Ltd., ethyl diethyl phosphonoacetate) E-2: Adekastab PEP-36 (manufactured by ADEKA Corporation, 3,9-bis(2,6-ditatobutyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane)

[0070] (Component F: Release agent) F-1: HW405MP (Manufactured by Mitsui Chemicals, Inc., polyethylene wax) (Component G: Drip inhibitor) G-1: Polyflon MPa FA-500H (Manufactured by Daikin Industries, Ltd., high molecular weight PTFE)

[0071] (Component H: Silicone compound) H-1: Polycarbonate-polyorganosiloxane copolymer (manufactured by Teijin Limited, 89 parts by weight of bisphenol A, 11 parts by weight of dihydroxyaryl-terminated polyorganosiloxane represented by the following formula (5), and phosgene, with a viscosity-average molecular weight of 19,800, polymerized by interfacial polymerization)

[0072] (Component I: Inorganic filler) I-1: Victorilite TK-RC (manufactured by Katsumitsuyama Mining Co., Ltd., talc) I-2: PFE-301S (manufactured by Nitto Boseki Co., Ltd., cut glass fiber)

[0073] (Component J: Compatibilizer) J-1: jER1256 (Manufactured by Mitsubishi Chemical Corporation, bisphenol A type phenoxy resin with epoxy equivalent of 7,500 to 8,500)

[0074] (Other ingredients) K-1: ROYAL BLACKRB90003S (manufactured by Koshigaya Chemical Co., Ltd., polystyrene resin master containing 50% carbon black)

[0075]

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[0094] The polycarbonate resin composition and molded articles made therefrom of the present invention possess high strength and rigidity, as well as excellent impact resistance, flame retardancy, and fluidity, 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, comprising 1 to 50 parts by weight of (C) phosphorus-based flame retardant (component C) per 100 parts by weight of component A.

3. The polycarbonate resin composition according to claim 1, comprising 0.01 to 2 parts by weight of (D) a metal salt-based flame retardant (component D) per 100 parts by weight of component A.

4. The polycarbonate resin composition according to any one of claims 1 to 3, wherein component A is a polycarbonate resin having a terminal OH group content of 0.35% or more.

5. The polycarbonate resin composition according to any one of claims 1 to 4, wherein component B is carbon fiber obtained by recycling process scraps from the production of carbon fiber.

6. A polycarbonate resin composition according to any one of claims 1 to 5, comprising 0.001 to 1.0 parts by weight of (E) a phosphorus-based stabilizer (component E) per 100 parts by weight of component A.

7. A polycarbonate resin composition according to any one of claims 1 to 6, comprising 0.01 to 10 parts by weight of (F) a mold release agent (component F) per 100 parts by weight of component A.

8. The polycarbonate resin composition according to claim 2 or 3, comprising 0.01 to 50 parts by weight of (G) drip inhibitor (component G) per 100 parts by weight of component A.

9. The polycarbonate resin composition according to claim 2, comprising 0.01 to 50 parts by weight of (H) a silicone-based compound (component H) per 100 parts by weight of component A.

10. The polycarbonate resin composition according to claim 2, comprising 0.1 to 100 parts by weight of (I) inorganic filler (component I) per 100 parts by weight of component A.

11. The polycarbonate resin composition according to claim 2, comprising 0.01 to 50 parts by weight of (J) compatibilizer (component J) per 100 parts by weight of component A.

12. The polycarbonate resin composition according to claim 1, which has the same constituent components and quantities, but has a greater bending strength than a polycarbonate resin composition in which the number-average fiber length variation coefficient of the carbon fibers, which are component B, is less than 0.

4.

13. The polycarbonate resin composition according to claim 1, wherein the constituent components and quantities are the same, but the number-average fiber length variation coefficient of the carbon fibers that constitute component B is less than 0.4, and the polycarbonate resin composition has a notch-free Charpy impact strength equal to or greater than that of the polycarbonate resin composition according to claim 1.

14. The polycarbonate resin composition according to claim 2, wherein the constituent components and quantities are the same, but the polycarbonate resin composition has a greater flexural modulus than the polycarbonate resin composition in which the number-average fiber length variation coefficient of the carbon fibers, which are component B, is less than 0.

4.

15. The polycarbonate resin composition according to claim 3, wherein the constituent components and quantities are the same, but the polycarbonate resin composition has greater fluidity than the polycarbonate resin composition in which the number-average fiber length variation coefficient of the carbon fibers, which are component B, is less than 0.

4.

16. The polycarbonate resin composition according to claim 2 or 3, wherein the flame retardancy of a molded article with a thickness of 0.8 mm, measured according to the UL94 standard, is V-2 or higher.

17. A molded article comprising the polycarbonate resin composition according to any one of claims 1 to 16.

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