Patent ID: 8017704
Filing Date: 2011-09-13
Classification: C08F,Y10S

Abstract:
1. A process for the production of propylene copolymers wherein in a first step, an olefin polymerisation catalyst comprising a solid catalyst component is subjected to a prepolymerisation reaction in a prepolymerisation reactor, in which propylene monomers are present in an amount of 98.5 to 99.8 mol % and further alpha-olefin monomers other than propylene are present in an amount of 0.2 to 1.5 mol %, based on the combined amount of propylene and further alpha-olefin monomers, so that a prepolymer is produced on the catalyst in an amount of 10 to 1000 g per g of the solid catalyst component, and in a second, subsequent step, propylene and further alpha-olefin monomers other than propylene are copolymerised in the presence of the prepolymerised catalyst produced in the first step so that a propylene copolymer is obtained-which contains at least 0.1 mol % of alpha-olefin units other than propylene.