Patent ID: 6838510
Filing Date: 2005-01-04
Classification: C08L

Abstract:
1. A resin composition for automotive exterior application, which comprises (A) 50 to 70% by weight of a crystalline propylene-ethylene block copolymer (A-1) by itself or a polypropylene mixture comprising of the A-1 and a crystalline propylene homopolymer (A-2) in a weight equal to or less than the A-1, (B) 18 to 25% by weight of an elastomeric polymer, and (C) 15 to 25% by weight of an inorganic filler, wherein the crystalline propylene-ethylene block copolymer (A-1) is comprised of a propylene homopolymer segment and a propylene-ethylene random copolymer segment, and has a melt flow rate of 70 to 130 g/10 min as determined in accordance with ASTM D-1238 at a temperature of 230° C. and under a load of 2,160 g, wherein the crystalline propylene-ethylene block copolymer (A-1) has an isotactic pentad ratio (mmmm ratio) of the propylene homopolymer segment of 97% or more as determined by wherein the crystalline propylene homopolymer (A-2) has an isotactic pentad ratio (mmmm ratio) of 97% or more as determined by (B-2) an ethylene-α-olefin-nonconjugated polyene random copolymer, which has a melt flow rate of 1 g/10 min or less (ASTM D-1238, 230° C. and 2,160 g load), and (B-3) a hydrogenated block copolymer, wherein the hydrogenated block copolymer (B-3) is a hydrogen adduct of a block copolymer represented by the following formula (1) or (2),  where X is a polymer block of a monovinyl group-substituted aromatic hydrocarbon compound, Y is a polymer block of a conjugated diene compound, and n is an integer of 1 to 5, while a hydrogenation ratio of the Y part is 90 mole % or more, the X part content is 10 to 25% by weight, and a melt flow rate of the hydrogenated block copolymer (B-3) is 15 g/10 min or less (ASTM D-1238, 190° C. and 2,160 g load).