Patent ID: 6284355
Filing Date: 2001-09-04
Classification: B32B,C08F,C08J,C08L,C09D,Y02P,Y10T

Abstract:
A laminated film (LF-1) comprising:(i) a layer containing a propylene resin having a modulus of elasticity in bending at 23.degree.C. of from about 1300 to 2800 Mpa; and(ii) a layer containing a propylene block copolymer having (A) and (B) components; wherein the propylene block copolymer is prepared by a process comprising the steps of:(I) carrying out copolymerization of propylene with ethylene until the content of the component(A) reaches from about 40 to 85% by weight based on the total weight of the component(A) and the component(B) defined below, said component(A) being a propylene-ethylene copolymer component having an ethylene content (EA) of from about 1.5 to 6.0% by weight:(II) carrying out copolymerization of propylene with ethylene in the presence of the component(A) prepared in step (I) until the content of the component(B) reaches from about 15 to 60% by weight based on the total weight of the components (A) and (B), said component(B) being a propylene-ethylene copolymer component having an ethylene content (EB) of from about 7 to 17% by weight;provided that the intrinsic viscosity, (.eta.)B, of the component (B) is from about 2 to 5 dl/g, and the ratio of (.eta.)B to the intrinsic viscosity, (.eta.)A, of the component(A), namely, (.eta.)B/(.eta.)A, is from about 0.5 to 1.8; and further provided that said propylene resin excludes a propylene block copolymer which has a modulus of elasticity in bending at 23.degree. C. of not lower than about 1300 Mpa.