OLEFIN POLYMERIZATION PROCESS BASED ON A DOUBLE CATALYST SYSTEM FOR THE PRODUCTION OF LLDPE COPOLYMERS WITH IMPROVED PROCESSABILITY

摘要

these are ethylene-based polymers, generally characterized by a density of 0.89 to 0.93 g / cm3, a mw / mn ratio of 3 to 6.5, a mz of 200,000 to 650,000 g / mol, a cy-a parameter at 190 ° c from 0.2 to 0.4 and a short chain reverse branch distribution. the atref profile of these polymers can have a high temperature peak of 92 to 102 ° c and a low temperature peak of 18 to 36 ° c less than that of the high temperature peak. these polymers can have physical properties comparable to those of a metallocene-catalyzed lldpe, but with improved processability, shear thinning and melt resistance, and can be used in blown films and other end-use applications.