Process for the polymerization of olefins

Details Process for the polymerization of olefins Process for the polymerization of olefins

2006-03-22

2010-06-01

Lu, Caixia (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S065000, C526S066000, C526S078000, C526S160000, C526S165000, C526S348000, C526S943000, C502S103000, C502S152000

Reexamination Certificate

active

07728086

ABSTRACT:
A multistep process comprising the following steps:step a) polymerizing propylene and optionally one or more monomers selected from ethylene or alpha olefins of formula CH2═CHT1wherein T1is a C2-C10alkyl radical in the presence of a catalyst system supported on an inert carrier, comprising:ii) one or more metallocene compounds of formula (I):ii) an alumoxane or a compound capable of forming an alkyl metallocene cation; and optionallyiii) an organo aluminum compound;step b) contacting, under polymerization conditions, in a gas phase, propylene or ethylene with one or more alpha olefins of formula CH2═CHT, wherein T is hydrogen or a C1-C10alkyl radical, and optionally a non-conjugated diene, in the presence of the polymer obtained in step a) and optionally in the presence of an additional organo aluminum compound; provided that an homopolymer is not produced;wherein: the compound of formula (I) is described in the application.

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