PREPARATION OF SYNDIOTACTIC 1,2-POLYBUTADIENE USING A CHROMIUM-CONTAINING CATALYST SYSTEM

摘要

The instant invention teaches a method for forming a syndiotactic 1,2-polybutadi ene product having a syndiotacticity of more than 66.5 % and a melting temperature o f more than about 100~C. The method includes polymerizing 1,3-butadiene in solution with a s olvent, in the presence of catalytically effective amounts of: (a) an organomagnesium compound; (b) a chromium compound; and, (c) a dihydrocarbyl hydrogen phosphite. The present inve ntion also contemplates a product of the method and an article made from the product.