Process for production of propylene homopolymers

Details Process for production of propylene homopolymers Process for production of propylene homopolymers

2007-05-15

2007-05-15

Rabago, Roberto (Department: 1713)

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

Synthetic resins

Polymerizing in two or more physically distinct zones

C526S070000, C526S351000, C525S053000, C525S240000

Reexamination Certificate

active

11089955

ABSTRACT:
A process for producing propylene homopolymers comprises producing a homopolymer in a reactor train having a first stage and a second stage, wherein the first stage is normally used for homopolymer production and the second stage is normally used only in the production of copolymer blends, and is left idle during homopolymer production. According to the invention, during the production of propylene homopolymer, the polymerization is carried out sequentially in both the first stage and second stage reactors.

REFERENCES:
patent: 6689845 (2004-02-01), Govoni et al.
patent: 2001/0004662 (2001-06-01), Bidell et al.
patent: 2003/0130444 (2003-07-01), Satou et al.
patent: 2003/0149196 (2003-08-01), Streeky et al.
patent: 2005/0032991 (2005-02-01), Chosa et al.
patent: WO 99/20663 (1999-04-01), None

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