Patent ID: 8153734
Filing Date: 2012-04-10
Classification: C08F

Abstract:
1. A process for preparing a polyethylene resin in a double loop reactor comprising: injecting into a first reactor an activated supported catalyst system, wherein the catalyst system comprises from 25 to 55 wt. % of a first bisindenyl catalyst component and from 45 to 75 wt % of a second bistetrahydroindenyl catalyst component; injecting ethylene monomer and optional comonomer into the first reactor simultaneously with or after the catalyst system; maintaining under polymerisation conditions in the first reactor; transferring the catalyst system and polymer into a second reactor and injecting fresh monomer and the same optional comonomer; maintaining in the second reactor the same polymerisation conditions as in the first reactor; and retrieving a polyethylene resin from the second reactor, wherein a level of long chain branches increases when passing from the first to the second reactor.