Continuous preparation of polyolefin having broad molecular weight distribution

Abstract

Abstract PURPOSE: To prepare continuously a polyolefin having a broad molecular weight distribution, by maintaining the first and the second step reactor under specific polymerization states and using an active Ziegler catalyst carried on a carrier. CONSTITUTION: A high molecular weight copolymer dispersed in a solvent is first prepared by feeding an olefin monomer and comonomers continuously into the first step reactor wherein the upper part is free of the gas phase and filled with the liquid, and copolymerizing the monomers in the presence of a solvent, hydrogen and a highly active Ziegler catalyst carried on a solid carrier. The mixture is continuously transferred to the second step reactor of a vertical stirring vessel kept to a pressure lower than that of the first step reactor, by the pressure difference without separation of the mixture and forced transfer means. Low molecular weight polymer is continuously prepared in the presence of the olefin monomer and hydrogen, under the condition that the gas phase is present at the upper part of the stirring vessel, and taken out from the vessel. COPYRIGHT: (C)1979,JPO&Japio

Inventors

• 👤 Nobuyuki Kuroda
• 👤 Yasunosuke Miyazaki
• 👤 Kazuo Matsuura
• 👤 Kunimichi Kubo
• 👤 Mitsuharu Miyoshi

Bibliographic Details