PREPARATION OF LLDPE RESINS AND FILMS HAVING LOW GELS

摘要

Disclosed is a process for making a linear low density polyethylene (LLDPE) having low gels. The process comprises copolymerizing ethylene with one or more C3-10 a-olefins to produce an LLDPE resin which has a gel defect area less than 25 ppm. The copolymerization is performed in the presence of a Ziegler-Nattta catalyst which comprises an MgCI2 support, a Ti(IV) complex, and a cyclic ether as an internal electron donor. The Ziegler-Natta catalyst has a Mg/Ti molar ration greater than or equal to 7.