Preparation of high cis-1,4-polybutadiene with reduced gel

摘要

There is provided a process for the preparation of a high cis-1,4-polybutadiene with a reduced microgel content wherein a novel catalyst system consisting of (1) a nickel salt of a carboxylic acid, (2) a mixture of triethyl aluminum and an organoaluminum compound having the formula R3Al, said mixture having an average composition Et3-xRxAl wherein Et is an ethyl group, x is a numeral from 0.1 to 2.9 and R is an alkyl group having 8 to 12 carbon atoms, and (3) a boron trifluoride etherate is used to polymerize 1,3-butadiene in an inert hydrocarbon.