Polymerization catalysts

摘要

Improved catalysts are disclosed for producing highly crystalline alpha-olefin polymers and highly crystalline copolymers of an alpha-olefin with ethylene or other olefins. Such catalysts can reduce the amount of coproduced amorphous polymer formed without substantial adverse effect on polymerization yield. These novel catalysts involve improving an alkylaluminum component-titanium chloride catalyst by using such catalyst in combination with effective amounts of sulfur dioxide and certain amines. Such catalyst compositions are useful in slurry polymerization, bulk polymerization and, particularly, vapor phase polymerization.