Patent ID: 7365137
Filing Date: 2008-04-29
Classification: C08F,C08L

Abstract:
1. A process for the polymerization of olefins of formula CH 2 ═CHR, wherein R is hydrogen or an alkyl, cycloalkyl or aryl radical with 1-20 carbon atoms, comprising the following steps: a) a first step of polymerization wherein at least one of said olefins are polymerized, in at least one reactor, in the presence of a catalyst comprising the product of reaction between an alkyl-Al compound and (i) a solid component comprising a compound of a transition metal M b) a treatment step comprising: c) a second step of polymerization wherein at least one olefin is polymerized, in at least one gas phase reactor, in the presence of the product obtained in the treatment step b); and wherein the amount of homo- or copolymer of olefins produced in the first polymerization step a) is between 10% to 90% by weight of the total amount of polymer produced.