Patent ID: 6180709
Filing Date: 2001-01-30
Classification: C08L

Abstract:
A thermoplastic resin composition comprising the following components (A) to (E):component (A): 50 to 74.7% by weight of a Ziegler-Natta catalyst sequentially polymerized blend of a propylene homopolymer and an ethylene-propylene copolymer containing a propylene homopolymer having a melt flow rate of 20 to 200 g/10 min. and an isotactic pentad fraction of at least 0.98, said blend having a melt flow rate of 10 to 100 g/10 min. and a ratio of the weight average molecular weight to the number average molecular weight of 5 to 7,component (B): 5 to 10% by weight of an ethylene-octene random copolymer having a melting temperature of 40 to 55.degree. C. and a melt flow rate of 0.5 to 15 g/10 min.,component (C): 5 to 10% by weight of an ethylene-butene random copolymer having a melting temperature of less than 35.degree. C. and having a melt flow rate of 0.5 to 15 g/10 min.,component (D): 0.3 to 5% by weight of an elastomer, the elastomer being either one comprising a block structure represented by the following formula (I) and/or the following formula (II) and having a melting temperature of 80 to 110.degree. C., a melt flow rate of 0.5 to 20 g/10 min., a polyethylene crystalline moiety content of 20 to 40% by weight, and a random copolymer moiety content of 60 to 80% by weight, or one comprising a block structure represented by the following formula (III), the following formula (IV) and/or the following formula (V) and having a melt flow rate of not more than 15 g/10 min. and a polystyrene moiety content of 10 to 40% by weight and a random copolymer moiety content of 60 to 90% by weight:polyethylene-(ethylene/butene random copolymer)-polyethylene (I)polyethylene-(ethylene/butene random copolymer) (II)polystyrene-(ethylene/butene random copolymer)-polystyrene (III)polystyrene-(ethylene/propylene random copolymer)-polystyrene (IV)polystyrene-(ethylene/propylene random copolymer) (IV);andcomponent (E): 15 to 25% by weight of a talc having an average particle diameter of up to 5 .mu.m and a specific surface area of at least 3.5 m.sup.2 /g.