Patent ID: 7553916
Filing Date: 2009-06-30
Classification: B01J,C08F,Y02P,Y10S

Abstract:
1. A process for polymerizing in a first polymerization at least one olefinic monomer selected from ethylene, propylene, 1-butene or mixtures thereof in a first loop reactor in the presence of a polymerization catalyst at from 20 to 150°C., but below the melting point of a polymer to be formed, and a pressure of from 5 to 100 bar, where the polymer formed is present in a suspension in a liquid or supercritical suspension medium and wherein the suspension is circulated by means of an axial pump, wherein the loop reactor comprises a cyclic reactor tube whose diameter varies by at least 10%, based on the predominant reactor tube diameter, and in which there is at least one widening and narrowing in a region other than that of the axial pump, wherein an olefin polymer of ethylene, propylene, butene or mixtures thereof is formed.