Patent ID: 8013069
Filing Date: 2011-09-06
Classification: C08L

Abstract:
1. A process for the production of a polymer blend comprising: (i) a first polymerization stage comprising polymerizing a first polymer comprising propylene-derived units in a first reactor to produce a solution of the first polymer comprising propylene-derived units, wherein the first polymer comprising propylene-derived units comprises at least 75 wt. % of propylene-derived units and wherein the propylene-derived units have an isotactic triad fraction of about 65% to about 99% and wherein the first polymer comprising propylene-derived units has a heat of fusion of less than 75 J/g; (ii) a second polymerization stage comprising polymerizing a second polymer comprising propylene-derived units in a second reactor to produce a solution of the second polymer comprising propylene derived units, wherein the second polymer comprising propylene-derived-units comprises at least 90 wt. % of propylene derived units and wherein the second polymer comprising propylene-derived units has a melting temperature of at least 100° C.; (iii) combining the solution of the first polymer comprising propylene-derived units and the solution of the second polymer comprising propylene-derived units after polymerization to produce a polymer blend solution comprising at least one non-polymeric component; and (iv) processing the polymer blend solution to produce the polymer blend.