	US 11,884,802 B2
	Thermoplastic resin composition having high rigidity and low coefficient of linear thermal expansion and molded article comprising same
Jin Young Yoon, Gimpo-si (KR); Hee Joon Lee, Seoul (KR); Dong Eun Cha, Hwaseong-si (KR); Sun Jun Kwon, Seoul (KR); Chun Ho Park, Seoul (KR); Seung Ryong Jeong, Seoul (KR); and Jin Bo Chae, Seoul (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and HDC HYUNDAI ENGINEERING PLASTICS CO., LTD., Dangjin-si (KR)
Filed by Hyundai Motor Company, Seoul (KR); Kia Corporation, Seoul (KR); and HDC Hyundai Engineering Plastics Co., Ltd., Danjin-si (KR)
Filed on Jul. 6, 2022, as Appl. No. 17/810,878.
Claims priority of application No. 10-2021-0088631 (KR), filed on Jul. 6, 2021.
Prior Publication US 2023/0020121 A1, Jan. 19, 2023
Int. Cl. C08L 23/12 (2006.01); C08L 23/14 (2006.01)

CPC C08L 23/12 (2013.01) [C08L 23/14 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01); C08L 2207/04 (2013.01)]

14 Claims

1. A thermoplastic resin composition comprising:

a polypropylene composite resin comprising at least two selected from the group consisting of crystalline polypropylene resulting from polymerization of 0.1 wt % to 10 wt % of an alkylene monomer having 4 to 10 carbon atoms and 90 wt % to 99.9 wt % of a propylene monomer, an ethylene-propylene copolymer resulting from polymerization of 1 wt % to 50 wt % of an ethylene monomer and 50 wt % to 99 wt % of a propylene monomer, and a polypropylene elastomer resulting from polymerization of 20 wt % to 85 wt % of ethylene-propylene rubber and 15 wt % to 80 wt % of homo-polypropylene;

an elastomer comprising ethylene-α-olefin; and

an inorganic filler,

wherein the thermoplastic resin composition has a flexural modulus (FM) of 2,500 MPa or more and a coefficient of linear thermal expansion (CLTE) of 60 μm/m·° C. or less,

wherein the polypropylene elastomer has a melt index (230° C., 2.16 kgf) of 10 g/10 min to 20 g/10 min.