摘要 |
Blends of syndiotactic 1,2-polybutadiene and rubbery elastomers are prepared by a process that comprises polymerizing 1,3-butadiene monomer into syndiotactic 1,2-polybutadiene within a rubber cement of at least one rubbery elastomer by using a chromium-based catalyst composition that is formed by combining a chromium-containing compound, a hydrogen phosphite, and an organomagnesium compound.
|