DIRECT CONVERSION OF A POLYMERIZATION REACTION CATALYZED BY A ZIEGLER-TYPE CATALYST INTO ONE CATALYZED BY A CHROMIUM-BASED CATALYST

摘要

- 31 -ABSTRACT OF THE DISCLOSUREA method of converting a continuous olefinpolymerization reaction catalyzed by a Ziegler-typecatalyst into one catalyzed by a chromium-basedcatalyst, without the need of emptying and re-charging the polymerization reactor, by adding ahydroxyl-containing compound to the reactor con-taining the Ziegler-type catalyst to interact withsuch catalyst before the chromium-based catalyst isintroduced into the reactor.D-12,981-1