Multistage process for the (CO) polymerization of olefins

Details Multistage process for the (CO) polymerization of olefins Multistage process for the (CO) polymerization of olefins

1995-06-05

1996-12-31

Teskin, Fred

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 52, 525 53, 525242, 525245, 525297, 525319, 525320, 525322, 526 64, 526 65, 526127, 526160, 5261243, 526901, 526943, C08F29500, C08F 1006

Patent

active

055895492

ABSTRACT:
Multistage process for the polymerization of olefins CH.sub.2 .dbd.CHR, where R is hydrogen or an alkyl, cycloalkyl or aryl radical with 1-10 carbon atoms, comprising two stages of polymerization. In a first stage, in the presence of a titanium or a vanadium catalyst and working in one or more reactors, an olefinic polymer with particular values of porosity is prepared; in a second stage, in the presence of the said porous polymer and a metallocene compound and/or their reaction products, one or more olefins, that are equal to or different from those polymerized in the first stage, are polymerized in one or more reactors.

REFERENCES:
patent: 4298718 (1981-11-01), Mayr et al.
patent: 4495338 (1985-02-01), Mayr et al.
patent: 4521566 (1985-06-01), Galli et al.
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patent: 5132262 (1992-07-01), Rieger et al.
patent: 5322902 (1994-06-01), Schreck et al.
patent: 5428110 (1995-06-01), Uehara et al.
patent: 5449738 (1995-09-01), Koura et al.
patent: 5468810 (1995-11-01), Hayakawa et al.
patent: 5486572 (1996-01-01), Fujita et al.

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