Patent ID: 8450400
Filing Date: 2013-05-28
Classification: C08K,C08L

Abstract:
1. A polypropylene resin composition comprising: 98 to 50 parts by weight of a polypropylene (A) comprising a propylene-ethylene block copolymer (A-1) or a polymer mixture containing a propylene-ethylene block copolymer (A-1) and a propylene homopolymer (A-2), 1 to 25 parts by weight of an ethylene-α-olefin copolymer rubber (B) which comprises an α-olefin having 4 to 12 carbon atoms and ethylene and which has a density of 0.85 to 0.87 g/cm 1 to 25 parts by weight of an inorganic filler (C), 0.02 to 1 part by weight of a hindered amine light stabilizer (D) which satisfies requirements (a), (b) and (c) given below, 0.05 to 1 part by weight of a nonionic antistatic agent (E), provided that the combined amount of the polypropylene resin (A), the ethylene-α-olefin copolymer rubber (B) and the inorganic filler (C) is let be 100 parts by weight: requirement (a): it has a 2,2,6,6-tetramethylpiperidyl group represented by formula (I); requirement (b): it has an acid dissociation constant (pka) of less than 8; requirement (c): the weight loss rate, as measured in an thermogravimetric analysis at a measurement temperature of 300° C. under a nitrogen gas atmosphere, is less than 10% by weight.