LLDPE PREPARATION OF LLDPE HAVING CONTROLLED XYLENE SOLUBLES OR HEXANE EXTRACTABLES

摘要

A method of making LLDPE grades with different xylene solvates or hexane extracts with the same Ziegler-Natta catalyst is disclosed by varying the amount of alkyl aluminum used in the polymerization. The method comprises: copolymerizing ethylene and a C _3-10 alpha-olefin in the presence of a Ziegler-Natta catalyst, an alkyl aluminum, and an electron donor; Measuring the dependency of xylene solubles or hexane extract on alkyl aluminum / electron donor ratios; And adjusting the alkyl aluminum / electron donor ratio to obtain the desired xylene solubles or hexane extract.