Patent ID: 6528588
Filing Date: 2003-03-04
Classification: C08F,C08L

Abstract:
A process for preparing blends of syndiotactic 1,2-polybutadiene and rubbery elastomers comprising the steps of:(1) providing a mixture of a rubber cement and 1,3-butadiene monomer; and (2) preparing a catalyst composition, where the catalyst composition is prepared by combining, outside the presence of the mixture of rubber cement and monomer, (a) a chromium-containing compound, (b) a hydrogen phosphite, and (c) an organomagnesium compound or (a) a molybdenum-containing compound, (b) a hydrogen phosphite, and (c) an organoaluminum compound; and (3) adding the catalyst composition to the mixture and thereby polymerizing the 1,3-butadiene monomer into syndiotactic 1,2-polybutadiene within the rubber cement.