PROCESS FOR PREPARING, IN SINGLE REACTOR, POLYMER BLENDS HAVING BROAD MOLECULAR WEIGHT DISTRIBUTION

摘要

PROBLEM TO BE SOLVED: To provide an improved process for forming polymer blends of ethylene-based polymers having a broad MWD (e.g., greater than 2) and ethylene-based polymers having a narrow MWD.SOLUTION: A process comprises contacting, under polymerization conditions and in a single reaction vessel 12, (i) ethylene, (ii) at least one C-C-olefin, (iii) optionally, at least one polyene, and (iv) catalysts, which are a primary catalyst 1 and a primary catalyst 2 of a mixed constrained geometry catalyst system. The weight ratio of the primary catalyst 1 to the primary catalyst 2, based on the weight of the metal M contained in each catalyst, is between 90:10 and 10:90.