Patent ID: 6096837
Filing Date: 2000-08-01
Classification: B01J,C08F,Y10S

Abstract:
A method for preventing sheeting problems in a gas phase reactor in a multi-phase polymerization process, which comprises one or more loop reactors, where alpha-olefins are polymerized or copolymerized in particle form in the presence of catalysts and which loop reactor(s) is followed by a gas phase reactor, where the polymerization is continued in the presence of added monomers, and in which process a fouling preventive agent is used to prevent fouling or sheeting in the reactors, characterized in that 30-70% of the end product is polymerized in the loop reactor(s), where the whole amount of the fouling preventive agent is added into the loop reactor and that the amount of the fouling preventive agent is higher than necessary to prevent the fouling in the loop reactor.