Multistep process for the (co) polymerization of olefins

Details Multistep process for the (co) polymerization of olefins Multistep process for the (co) polymerization of olefins

2008-04-29

2008-04-29

Rabago, Roberto (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S114000, C526S118000, C526S119000, C526S124300, C526S161000, C526S127000, C525S240000

Reexamination Certificate

active

10482877

ABSTRACT:
A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step wherein the polymer obtained in the first step is contacted with a catalyst system comprising an half-sandwich metallocene compound, followed by a second polymerization step. The amount of homo- or copolymer of olefins produced in the first polymerization step is between 10% to 90% by weight of the total amount of polymer produced.

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