# US 10,479,885 B2 · Thermoplastic resin composition and article produced therefrom > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,885 B2 - Document ID: US10479885B2 - Status: Granted - Kind: B2 - Application number: 15/698,999 - Filed: 2017-09-08 - Published: 2018-03-29 - Granted: 2019-11-19 - Earliest claimed: 2016-09-29 - Assignees: Lotte Advanced Materials Co., Ltd. - Applicants: Lotte Advanced Materials Co., Ltd. - Inventors: Sung Oh Eim; Young Chul Kwon - Web page: https://patentgrep.com/patent/US10479885B2 ## CPC - C08L 25/12: with unsaturated nitriles - F25D 23/08: Parts formed wholly or mainly of plastics materials - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2205/035: containing four or more polymers in a blend - F25D 23/066: {Liners} - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) ## Abstract A thermoplastic resin composition includes: a first rubber-modified vinyl graft copolymer obtained by grafting a monomer mixture including an aromatic vinyl monomer and a vinyl cyanide monomer to a diene rubber polymer; a second rubber-modified vinyl graft copolymer obtained by grafting a monomer mixture including an aromatic vinyl monomer and a vinyl cyanide monomer to an acrylate rubber polymer; a first aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 250,000 g/mol to about 450,000 g/mol and including about 25 wt % to about 31 wt % of a repeat unit derived from a vinyl cyanide monomer; a second aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 70,000 g/mol to about 150,000 g/mol and including about 33 wt % to about 42 wt % of a repeat unit derived from a vinyl cyanide monomer; and a third aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 70,000 g/mol to about 150,000 g/mol and including about 25 wt % to about 31 wt % of a repeat unit derived from a vinyl cyanide monomer. The thermoplastic resin composition can have excellent properties in terms of chemical resistance, stiffness, impact resistance, and the like. ## Claims ### Claim 1 A thermoplastic resin composition comprising: about 10 wt % to about 30 wt % of a first rubber-modified vinyl graft copolymer obtained by grafting a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer to a diene rubber polymer; about 1 wt % to about 15 wt % of a second rubber-modified vinyl graft copolymer obtained by grafting a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer to an acrylate rubber polymer; about 10 wt % to about 40 wt % of a first aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 250,000 g/mol to about 450,000 g/mol and including about 25 wt % to about 31 wt % of a repeat unit derived from a vinyl cyanide monomer; about 20 wt % to about 60 wt % of a second aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 70,000 g/mol to about 150,000 g/mol and including about 33 wt % to about 42 wt % of a repeat unit derived from a vinyl cyanide monomer; and 5 wt % to about 15 wt % of a third aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 70,000 g/mol to about 150,000 g/mol and including about 25 wt % to about 31 wt % of a repeat unit derived from a vinyl cyanide monomer, each based on 100 wt % of the thermoplastic resin composition, wherein the thermoplastic resin composition has a fracture strain ratio ε1/ε0 of about 65% to about 90%, as measured in accordance with ASTM D543-06 using a 3.2 mm thick specimen, wherein ε1 is fracture strain measured when the specimen not exposed to a chemical reagent is subjected to tensile testing and ε0 is fracture strain measured when the specimen exposed to a chemical reagent is subjected to tensile testing, wherein tensile testing is conducted at a tensile rate of 5 mm/min in accordance with ASTM D638. ### Claim 2 (depends on 1) The thermoplastic resin composition according to claim 1, wherein each of the diene rubber polymer and the acrylate rubber polymer has an average particle diameter of about 0.1 μm to about 0.4 μm. ### Claim 3 (depends on 1) The thermoplastic resin composition according to claim 1, further comprising: a rubber-modified aromatic vinyl copolymer resin comprising a rubber polymer having an average particle diameter of about 1 μm to about 10 μm. ### Claim 4 (depends on 3) The thermoplastic resin composition according to claim 3, comprising the rubber-modified aromatic vinyl copolymer resin in an amount of about 1 part by weight to about 10 parts by weight relative to about 100 parts by weight of the thermoplastic resin composition. ### Claim 5 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a tensile strength of about 450 MPa to about 600 MPa, as measured on a 3.2 mm thick specimen in accordance with ASTM D638. ### Claim 6 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a notched Izod impact strength of about 25 kgf·cm/cm to about 40 kgf·cm/cm, as measured on a ⅛″ thick specimen in accordance with ASTM D256. ### Claim 7 (depends on 1) A molded article formed of the thermoplastic resin composition according to claim 1. ### Claim 8 (depends on 7) The molded article according to claim 7, wherein the molded article is an inner case of a refrigerator. ### Claim 9 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a fracture strain ratio ε1/ε0 of about 70% to about 85%, as measured in accordance with ASTM D543-06 using a 3.2 mm thick specimen, wherein ε1 is fracture strain measured when the specimen not exposed to a chemical reagent is subjected to tensile testing and ε0 is fracture strain measured when the specimen exposed to a chemical reagent is subjected to tensile testing, wherein tensile testing is conducted at a tensile rate of 5 mm/min in accordance with ASTM D638. ### Claim 10 (depends on 1) The thermoplastic resin composition according to claim 1, wherein each of the first aromatic vinyl-vinyl cyanide copolymer and the third aromatic vinyl-vinyl cyanide copolymer include about 25 wt % to about 30 wt % of the repeat unit derived from the vinyl cyanide monomer. ### Claim 11 (depends on 10) The thermoplastic resin composition according to claim 10, wherein each of the first aromatic vinyl-vinyl cyanide copolymer and the third aromatic vinyl-vinyl cyanide copolymer include about 25 wt % to about 28 wt % of the repeat unit derived from the vinyl cyanide monomer.