abstract |
Syndiotactic 1,2-polybutadiene of high quality may be obtained in excellent yield by solution polymerization of butadiene-(1,3) in hydrocarbons, using organometallic mixed catalysts composed of trialkylaluminium, hydrocarbon-soluble chromium-III compounds and a dialkylphosphite corresponding to the formula <IMAGE> wherein R denotes straight chained or branched C1-C8-alkyl and R1, R2 and R3 denote methyl or ethyl or R and R1 together form a methylene group. |