Investigation of methylaluminoxane as a cocatalyst for the polymerization of 1,3-butadiene to high cis-1,4-polybutadiene

The catalytic system Co/methylaluminoxane/tert-butyl chloride has been stud ied and optimized for the polymerization of 1,3-butadiene to high cis-1,4-p olybutadiene. The ratio of the individual catalyst components was investiga ted to achieve maximum conversion, stereoregularity, and molecular weight. It was found that the specific order of addition of catalyst components to the feedstock and aging time therein has critical influence in the polymeri zation reaction. This can be attributed to the rate of chlorinating the alu minoxane and the stability of the active catalyst sites obtained. (C) 1999 John Wiley & Sons, Inc.