Patent ID: 6395829
Filing Date: 2002-05-28
Classification: C08L

Abstract:
An amorphous polyolefin resin composition being excellent in impact resistance and surface glossiness which is an amorphous polyolefin resin composition comprising (A) 100 parts by weight of an amorphous polyolefin and (B) from 1 to 100 parts by weight of an impact resistance improver, wherein:said impact resistance improver (B) comprises, as the essential components, at least one block copolymer (B-1) and at least one core-shell elastomer (B-2); said core-shell elastomer (B-2) has (i) a shell layer comprising at least 70% by weight of an aromatic vinyl monomer and (ii) at least one other shell layer; the content of said shell layer (i) is from 1 to 20% by weight of the whole component (B-2); said shell layer (ii) comprises at least one monomer selected from the group consisting of alkyl (meth)acrylates carrying an alkyl group having 3 or more carbon atoms, aromatic vinyl monomers, alkyl (meth)acrylates carrying an alkyl group having 2 or less carbon atoms and (meth)acrylonitrile and the total content of the alkyl (meth)acrylate carrying an alkyl group having 2 or less carbon atoms and (meth)acrylonitrile is from 0 to 10% by weight of the whole (B-2) component; in an arbitrary composition comprising component (A) and components (B-1) and (B-2) with a same ratio of component (B-1) to component (B-2) (i.e., (B-1)/(B-2)) as said amorphous polyolefin resin composition and with a weight ratio of the component (A) to the component (B) (i.e., (A)/(B)) of 80/20, the impact resistance strength expressed by the Izod strength is 8 kgÂ·cm/cm or more and said impact resistance strength is 1.4 times or more than the Izod strength of a composition comprising (A) and (B-2) without (B-1) at a weight ratio of the component (A) to the component (B-2) (i.e., (A)/(B-2)) of 80/20; and an injection-molded article (thickness: 3 mm) of said amorphous polyolefin resin composition has a surface gloss value (60Â° Gloss value) of 60 or more, wherein said amorphous polyolefin (A) is a cyclic olefin copolymer (A-1) and said cyclic olefin copolymer (A-1) is an addition copolymer (A-1-1) comprising ethylene with a cyclic olefin optionally together with an &agr;-olefin, or a hydrogenation product (A-1-2) of a ring-opening polymer of a cyclic olefin.