# US 2001/0023937 A1 · Carbon-reinforced PC-ABS composition and articles made from same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2001/0023937 A1 - Document ID: US20010023937A1 - Status: Published application - Kind: A1 - Application number: 09/794,175 - Filed: 2001-02-27 - Published: 2001-09-27 - Earliest claimed: 2000-02-03 - Assignees: General Electric Company - Inventors: Nirajkumar Patel - Web page: https://patentgrep.com/patent/US20010023937A1 ## CPC - H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon - B29C 45/0001: {characterised by the choice of material} - B29C 45/0005: {using fibre reinforcements} - C08K 7/06: Elements - C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers - C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates - C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract Carbon fiber-filled PC-ABS resin compositions which have improved electrical properties at a given level of carbon fibers, and which do not suffer from as significant a decrease in impact strength as would result from the introduction of generic carbon fibers are achieved using carbon fibers treated with a polyamide terpolymer binder. The bundles are dispersed within the PC-ABS blend. The compositions can be used for injection molding of articles for use as components in applications requiring static dissipation and/or EMI shielding. Such articles include, but are not limited to electronic devices, dust handling equipment and notebook computer enclosures. ## Claims ### Claim 1 A composition comprising: (a) a thermoplastic resin comprising a blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer; and (b) carbon fibers associated into bundles with a polyamide terpolymer binder, said bundles being dispersed within the thermoplastic resin. ### Claim 2 (depends on 1) The composition of claim 1, wherein the carbon fibers are present in an amount of from 5 to 50% by weight of the composition. ### Claim 3 (depends on 2) The composition of claim 2, wherein the binder is present in an amount of from 0.5 to 10% by weight of the carbon fibers. ### Claim 4 (depends on 1) The composition of claim 1, wherein the binder is present in an amount of from 0.5 to 10% by weight of the carbon fibers. ### Claim 5 (depends on 1) The composition of claim 1, further comprising a flame retardant. ### Claim 6 (depends on 1) The composition of claim 1, wherein the blend comprises polycarbonate and acrylonitrile-butadiene-styrene copolymer in a ratio of from 10:90 to 90:10, by weight. ### Claim 7 (depends on 6) The composition of claim 6, wherein the carbon fibers are present in an amount of from 5 to 50% by weight of the composition. ### Claim 8 (depends on 7) The composition of claim 7, wherein the binder is present in an amount of from 0.5 to 10% by weight of the carbon fibers. ### Claim 9 A method for making an injection-molded article comprising the steps of: (a) preparing a composition comprising a thermoplastic resin comprising a blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer, and carbon fibers associated into bundles with a polyamide terpolymer binder, said bundles being dispersed within the thermoplastic resin; (b) heating the composition to melt the thermoplastic resin; and (c) injecting the heated composition into a mold shaped to form the article. ### Claim 10 (depends on 9) The method of claim 9, wherein the carbon fibers are present in an amount of from 5 to 50% by weight of the composition. ### Claim 11 (depends on 10) The method of claim 10, wherein the binder is present in an amount of from 0.5 to 10% by weight of the carbon fibers. ### Claim 12 (depends on 9) The method of claim 9, wherein the blend comprises polycarbonate and acrylonitrile-butadiene-styrene copolymer in a ratio of from 10:90 to 90:10 by weight. ### Claim 13 An injection-molded article prepared by a method comprising the steps of: (a) preparing a composition comprising a thermoplastic resin comprising a blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer, and carbon fibers associated into bundles with a polyamide terpolymer binder, said bundles being dispersed within the thermoplastic resin; (b) heating the composition to melt the thermoplastic resin; and (c) injecting the heated composition into a mold shaped to form the article. ### Claim 14 (depends on 13) The article of claim 13, wherein the carbon fibers are present in an amount of from 5 to 50% by weight of the composition. ### Claim 15 (depends on 14) The article of claim 14, wherein the binder is present in an amount of from 0.5 to 10% by weight of the carbon fibers. ### Claim 16 (depends on 13) The article of claim 13, wherein the blend comprises polycarbonate and acrylonitrile-butadiene-styrene copolymer in a ratio of from 10:90 to 90:10 by weight. ### Claim 17 A method for increasing the impact strength of a PC-ABS blend having carbon fibers dispersed therein, comprising the step of coating the carbon fibers with a polyamide terpolymer binder prior to dispersing them in the PC-ABS blend.