Patent ID: 8138251
Filing Date: 2012-03-20
Classification: C08F,C08L

Abstract:
1. A random block copolymer comprising: a) about 65 wt % to about 97 wt % of a crystalline propylene/ethylene copolymer A containing from about 0.5 wt. % to about 6 wt. % of units derived from ethylene and from about 94 wt. % to about 99.5 wt. % of units derived from propylene, having a melting point of 120° C. to about 159° C.; and copolymerized therewith, b) about 3 wt % to about 35 wt. % of a propylene/ethylene copolymer B containing from about 8 wt. % to about 40 wt. % of units derived from ethylene and from about 60 wt. % to about 92 wt. % of units derived from propylene, wherein the ratio of the powder MFR wherein K=1.0 to about 1.5, and wherein a crystalline to amorphous spacing ratio Lc/La of said random block copolymer ranges from about 1.00 to about 2.25.