US 12,421,381 B2
Thermoplastic resin composition, method of preparing the same, and molded article including the same
Jung Tae Park, Daejeon (KR); Dae Woo Lee, Daejeon (KR); Jae Bum Seo, Daejeon (KR); Gyu Sun Kim, Daejeon (KR); and Jiuk Jang, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/419,494
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 24, 2020, PCT No. PCT/KR2020/012972
§ 371(c)(1), (2) Date Jun. 29, 2021,
PCT Pub. No. WO2021/080199, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 10-2019-0132327 (KR), filed on Oct. 23, 2019.
Prior Publication US 2022/0089854 A1, Mar. 24, 2022
Int. Cl. C08L 33/08 (2006.01)
CPC C08L 33/08 (2013.01) 7 Claims
 
1. A thermoplastic resin composition, comprising:
65 to 85% by weight of a heat-resistant copolymer (A) containing 86 to 90% by weight of a (meth)acrylic acid alkyl ester compound, 3 to 4% by weight of an N-substituted maleimide compound, and 7 to 10% by weight of an aromatic vinyl compound;
10 to 30% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (B) containing acrylate-based rubber having an average particle diameter of 50 to 200 nm; and
1 to 15% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (C) containing acrylate-based rubber having an average particle diameter of 300 to 600 nm,
wherein, in the heat-resistant copolymer (A), a weight ratio of the aromatic vinyl compound to the N-substituted maleimide compound is 1.6 to 7.5,
wherein the heat-resistant copolymer (A) has a refractive index of 1.515 or less,
wherein the heat-resistant copolymer (A) has a weight average molecular weight of 80,000 to 130,000 g/mol,
wherein the thermoplastic resin composition has an L value (colorability) of 20 to 24.1 as measured using a color meter according to a CIE 1976 L*a*b* color system, and
wherein the thermoplastic resin composition has a heat deflection temperature of 91° C. or more.