Patent ID: 6034023
Filing Date: 2000-03-07
Classification: C08F

Abstract:
A process for the preparation of a deactivated Ziegler-Natta catalyst system with a long storage life, suitable upon reactivation, for the preparation of polymers of propylene and of polymers of propylene together with other .alpha.-olefins containing, as active components, a catalyst suspension ofa) a titanium-containing solid component which contains titanium, magnesium, halogen and a carboxylic ester and, as a cocatalyst,b) an aluminum compound andc) an organosilicon compound as a further cocatalyst;which process comprises reacting components a), b), and c), wherein, after the reaction, the reaction mixture is deactivated by reaction with carbon dioxide, whereby gaseous carbon dioxide is introduced into the gas space above the catalyst suspension at from 1 to 30 bar.