# US 11,993,695 B2 · Thermoplastic resin composition having excellent heat resistance and electromagnetic wave shielding capacity, method of preparing thermoplastic resin composition, and injection-molded article manufactured using thermoplastic resin composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,993,695 B2 - Document ID: US11993695B2 - Status: Granted - Kind: B2 - Application number: 17/261,250 - Filed: 2019-11-14 - Published: 2021-09-02 - Granted: 2024-05-28 - Earliest claimed: 2019-01-11 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Gi Dae Choi; Youngjoo Kim; Eon Seok Lee; Changhun Yun; Minsu Kim - Web page: https://patentgrep.com/patent/US11993695B2 ## CPC - B29B 7/482: {provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs} - C08K 3/046: {Carbon nanorods, nanowires, nanoplatelets or nanofibres} - B29B 7/007: {for continuous mixing} - B29B 7/603: {in measured doses, e.g. proportioning of several materials} - B29B 7/726: {Measuring properties of mixture, e.g. temperature or density (B29B7/724 takes precedence)} - B29B 7/90: Fillers or reinforcements {, e.g. fibres} - B29B 9/12: characterised by structure or composition - B29C 48/0022: {combined with cutting} - B29C 48/40: using two or more parallel screws {or at least two parallel non-intermeshing screws}, e.g. twin screw extruders - B29C 48/425: using three or more screws (serially arranged screws B29C48/38, B29C48/385) - B29C 48/92: Measuring, controlling or regulating - C08K 3/042: {Graphene or derivatives, e.g. graphene oxides} - C08K 3/08: Metals - C08K 7/06: Elements - C08L 101/00: Compositions of unspecified macromolecular compounds - H05K 9/009: {comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked} - B29B 7/826: {Apparatus therefor} - B29B 9/06: in the form of filamentary material, e.g. combined with extrusion - B29C 2948/9259: Angular velocity - B29C 2948/92704: Temperature - B29C 2948/92885: Screw or gear - B29K 2301/12: Thermoplastic materials - B29K 2995/0011: Electromagnetic wave shielding material - C08K 3/04: Carbon - C08K 2003/0843: {Cobalt} - C08K 2003/0856: {Iron} - C08K 2003/0862: {Nickel} - C08K 2201/001: Conductive additives - C08K 2201/003: Additives being defined by their diameter - C08K 2201/006: Additives being defined by their surface area - C08K 2201/01: Magnetic additives - C08K 2201/011: Nanostructured additives - B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - 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) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract Provided is a thermoplastic resin composition, including (a) 100 parts by weight of a thermoplastic resin including 80-100% by weight of a base resin and 0-20% by weight of a reinforcing resin; (b) 2-60 parts by weight of linear carbon fibers having an average diameter of 1-15 μm; (c) 1-5 parts by weight of carbon nanofibrils having a BET specific surface area of 200-400 m2/g; (d) 1-15 parts by weight of carbon nanoplates; and (e) 1-25 parts by weight of metal powder, a method of preparing the thermoplastic resin composition, and an injection-molded article manufactured using the thermoplastic resin composition. The thermoplastic resin composition has excellent mechanical properties, e.g., impact strength, and also excellent conductivity, heat resistance, and electromagnetic wave shielding capacity, particularly high shielding efficiency against high-frequency electromagnetic waves, and thus can be used as automobile, electric, and electronic parts, and as a substitute for aluminum alloys and magnesium alloys. ## Claims ### Claim 1 A thermoplastic resin composition having excellent heat resistance and electromagnetic wave shielding capacity, comprising: (a) 100 parts by weight of a thermoplastic resin comprising 80 to 90% by weight of a base resin and 10 to 20% by weight of an impact-reinforcing resin that is a modified polyolefin resin grafted with one or more unsaturated carboxylic acids or anhydrides thereof; (b) 2 to 60 parts by weight of a linear carbon fiber having an average diameter of 3 to 15 μm; (c) 1 to 5 parts by weight of a carbon nanofibril having a BET specific surface area of 200 to 400 m2/g; (d) 1 to 15 parts by weight of a carbon nanoplate; and (e) 1 to 25 parts by weight of a metal powder. ### Claim 2 (depends on 1) The thermoplastic resin composition according to claim 1, wherein a total weight of the components of (b), (c), (d), and (e) is 5 to 80 parts by weight. ### Claim 3 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the base resin comprises one or more selected from the group consisting of polyamide resins, polycarbonate resins, polyarylene sulfide resins, polystyrene resins, polyolefin resins, polyketone resins, and polyester resins. ### Claim 4 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the carbon nanoplate has an average thickness of 2 to 50 nm. ### Claim 5 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the metal powder is a magnetic metal powder. ### Claim 6 (depends on 5) The thermoplastic resin composition according to claim 5, wherein the magnetic metal powder comprises one or more selected from the group consisting of an iron powder, a cobalt powder, and a nickel powder. ### Claim 7 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the metal powder has an average diameter of 1 to 100 μm. ### Claim 8 (depends on 1) The thermoplastic resin composition according to claim 1, further comprising one or more additives selected from the group consisting of flame retardants, nucleating agents, UV absorbents, antioxidants, dust removing agents, antimicrobials, repellents, deodorants, anti-coloring agents, heat stabilizers, release agents, antistatic agents, plasticizers, lubricants, coloring agents, pigments, dyes, blowing agents, anti-foaming agents, coupling agents, and inorganic fillers. ### Claim 9 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a heat distortion temperature of 150° C. or more and an electromagnetic wave shielding dB value of 47 or more. ### Claim 10 (depends on 1) The thermoplastic resin composition according to claim 1, wherein, when Notched Izod impact strength is measured under a condition of specimen thickness of 4 mm according to an ISO 180A method, the thermoplastic resin composition has a Notched Izod impact strength of 70 kJ/m2 or more. ### Claim 11 (depends on 1) An injection-molded article having electromagnetic wave shielding capacity, comprising the thermoplastic resin composition of claim 1. ### Claim 12 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the metal powder comprises an iron powder. ### Claim 13 A method of preparing a thermoplastic resin composition having excellent heat resistance and electromagnetic wave shielding capacity, the method comprising melt-kneading and extruding a composition comprising: (a) 100 parts by weight of a thermoplastic resin comprising 80 to 90% by weight of a base resin and 10 to 20% by weight of an impact-reinforcing resin that is a modified polyolefin resin grafted with one or more unsaturated carboxylic acids or anhydrides thereof; (b) 2 to 60 parts by weight of a linear carbon fiber having an average diameter of 3 to 15 μm; (c) 1 to 5 parts by weight of a carbon nanofibril having a BET specific surface area of 200 to 400 m2/g; (d) 1 to 15 parts by weight of a carbon nanoplate; and (e) 1 to 25 parts by weight of a metal powder at a temperature of 250 to 320° C. and a rate of screw rotation of 250 to 350 rpm using an extruder to form the thermoplastic resin composition as an extrudate. ### Claim 14 (depends on 13) The method according to claim 13, comprising obtaining pellets by cutting the extrudate using a pelletizer after the melt-kneading and extruding.