Process for cationic polymerizations

摘要

Elastomeric polymers comprising polymerized alpha-olefins or conjugated alkadienes are produced by cationic polymerization in the presence of titanium tetrachloride and an electron pair donor selected from pyridine or a non-hindered alkylpyridine. The polymers have very narrow, mono-modal molecular weight distributions such a achived by anionic polymerization. Polymerization of each monomer is terminated prior to broadening of the molecular weight distribution which significantly detracts from polymer properties.