US 12,030,973 B2
Thermoplastic resin composition and molded article of same
Kentaro Hiraishi, Tokyo (JP); Yoshiaki Shinohara, Tokyo (JP); and Ichiro Kamata, Tokyo (JP)
Assigned to TECHNO-UMG CO., LTD., Tokyo (JP)
Appl. No. 18/284,192
Filed by Techno-UMG Co., Ltd., Tokyo (JP)
PCT Filed Feb. 22, 2022, PCT No. PCT/JP2022/007413
§ 371(c)(1), (2) Date Sep. 26, 2023,
PCT Pub. No. WO2022/209442, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 2021-054509 (JP), filed on Mar. 29, 2021.
Prior Publication US 2024/0092961 A1, Mar. 21, 2024
Int. Cl. C08F 283/12 (2006.01); C08F 220/18 (2006.01); C08F 220/40 (2006.01); C08F 285/00 (2006.01); C08G 77/20 (2006.01); C08K 5/14 (2006.01); C08L 25/12 (2006.01)
CPC C08F 283/124 (2013.01) [C08F 220/1804 (2020.02); C08F 220/40 (2013.01); C08F 285/00 (2013.01); C08G 77/20 (2013.01); C08K 5/14 (2013.01); C08L 25/12 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01)] 6 Claims
 
1. A thermoplastic resin composition comprising a resin component, wherein:
the resin component comprises a graft copolymer (A), a graft copolymer (B), and a vinyl copolymer (C),
the resin component is present in an amount of 90 to 100% by mass, based on a total mass of the thermoplastic resin composition,
a sum of amounts of the graft copolymer (A) and the graft copolymer (B) is 25 to 55% by mass, and an amount of the vinyl copolymer (C) is 45 to 75% by mass, provided that a sum of amounts of the graft copolymer (A), the graft copolymer (B) and the vinyl copolymer (C) is 100% by mass,
a proportion of a rubbery polymer contained in the thermoplastic resin composition is 21 to 28% by mass, based on a total mass of the thermoplastic resin composition, and a proportion of particles with a particle size of 300 nm or more among all particles formed by the rubbery polymer is 1 to 11% by mass, based on a total mass of the all particles,
the graft copolymer (A) is a graft copolymer obtained by polymerizing 80 to 20% by mass of a vinyl monomer mixture (m1) in the presence of an alkyl acrylate rubbery polymer (a) containing 0.2 parts by mass or more and less than 0.9 parts by mass of polyfunctional monomer units per 100 parts by mass of alkyl acrylate monomer units, provided that a sum of amounts of the alkyl acrylate rubbery polymer (a) and the vinyl monomer mixture (m1) is 100% by mass, wherein the alkyl acrylate rubbery polymer (a) has a volume average particle size of 70 nm or more and less than 130 nm,
the graft copolymer (B) is a graft copolymer obtained by polymerizing 80 to 20% by mass of a vinyl monomer mixture (m2) in the presence of an alkyl acrylate rubbery polymer (b) containing 0.9 to 2.2 parts by mass of polyfunctional monomer units per 100 parts by mass of alkyl acrylate monomer units, provided that a sum of amounts of the alkyl acrylate rubbery polymer (b) and the vinyl monomer mixture (m2) is 100% by mass, wherein the alkyl acrylate rubbery polymer (b) has a volume average particle size of 130 nm to 200 nm, and
the vinyl copolymer (C) comprises a vinyl copolymer obtained by polymerizing a vinyl monomer mixture (m3) comprising an alkyl acrylate monomer, an aromatic vinyl monomer, and a vinyl cyanide monomer.