Patent ID: 11905402
Assignee: KIA CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A thermoplastic resin composition having a low coefficient of linear thermal expansion, comprising:
a polypropylene-based resin having an isotactic pentad fraction of 96% or more as measured by 13C-NMR;
a thermoplastic elastomer comprising at least two elastomers;
an inorganic filler having an average particle diameter of 0.1 μm to 5 μm; and
a compatibilizer,
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 flexural modulus is measured according to ASTM D790 from a molded article of the size of 127×12.7×6.4 mm, a span length of 100 mm and a speed of 10 mm/min,
wherein the coefficient of linear thermal expansion is measured according to ASTM E831 from a molded article of the size of 10×12.8×3.2 mm, at a rate of 5° C./min and in the range of −30° C. to 30° C., and
wherein the thermoplastic resin composition having a melt index (230° C., 2.16 kgf) of 35 g/10 min to 50 g/10 min.