Patent ID: 9303094
Filing Date: 2016-04-05
CPC Classification: B01J,C08F

Claim Text:
1. Process for the transition between an ethylene co-polymerization process carried out in a polymerization reactor in the presence of a catalyst and of ethylene E and an olefin co-monomer A to produce an ethylene copolymer PEA into an ethylene co-polymerization process carried out in the same polymerization reactor in the presence of a catalyst and of ethylene E and an olefin co-monomer B to produce an ethylene copolymer PEB wherein co-monomer A and co-monomer B are different; co-monomer A and co-monomer B are both present in the reactor during at least part of the transition from PEA to PEB; said process comprising carrying out the transition continuously by performing the steps of: (i) starting the transition by stopping steady state production of ethylene copolymer PEA and, (ii) ending the transition when steady state production of ethylene copolymer PEB is achieved, wherein the polymerisation production rate, defined as the amount of polymer produced by unit of time (e.g. tonnes/hour), must fulfill the following equation wherein R