Patent ID: 8580890
Filing Date: 2013-11-12
Classification: C08L,Y10T

Abstract:
1. A heterophasic propylene copolymer, comprising: a propylene polymer matrix (M) comprising a propylene homopolymer or a random copolymer of propylene and at least one further olefin different from propylene, wherein the further olefin is present in amounts up to 4.0 wt % relative to the total weight of the random copolymer, and a rubber (R) comprising a first olefin, which is different from propylene, and a second olefin, which is different from the first olefin; wherein the heterophasic propylene copolymer has a melt flow index ranging from 45 to 75 dg/min, measured according to ISO 1133, condition L, at 230° C., 2.16 kg; wherein the rubber has an intrinsic viscosity ranging from 2.4 to 4.5 dl/g, measured in tetralin at 135° C. following ISO 1628; wherein the ratio of the intrinsic viscosities, measured in tetralin at 135° C. following ISO 1628, of the rubber (R) and the propylene polymer matrix (M), ηR/ηM, is at least 3.5; and wherein rubber particles are dispersed within the propylene polymer matrix, wherein at least 50% of the rubber particles have a size of at most 1.0 μm, determined on pellets by transmission electron microscopy.