| 摘要 |
A catalyst composition that is formed by combining a Cr-containing compound, a cyclic hydrogen phosphite, and at least one compound selected from aluminoxanes and compounds defined by the formula AlRnX3-n where each R independently is a monovalent organic group, where each X independently is a halogen atom, a carboxylate group, an alkoxide group, or an aryloxide group, and where n is an integer of from 1 to 3 inclusive. This catalyst composition is useful for polymerizing conjugated diene monomers and is particularly useful for polymerizing 1,3-butadiene into gel-free amorphous high-vinyl polybutadiene. |
