Process for making propylene homo or copolymers

Details Process for making propylene homo or copolymers Process for making propylene homo or copolymers

1996-05-17

2000-07-04

Wu, David W.

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

Synthetic resins

Polymerizing in tubular or loop reactor

526 65, 526351, 526901, 526904, 526905, 525 53, 525240, 525270, 525322, C08F 200

Patent

active

060840412

ABSTRACT:
A process for homo or copolymerizing propylene, wherein propylene is polymerized in the presence of a catalyst at an elevated temperature in a reaction medium in which a major part of the reaction medium is propylene and the polymerization is carried in at least one CSTR or loop reactor, where the polymerization is carried out at a temperature and a pressure which are above the corresponding critical temperature and the pressure of the reaction medium and where the residence time is at least 15 minutes. The process can also comprise a supercritical loop polymerization before the supercritical stage polymerization or a gas phase polymerization after the supercritical stage polymerization.

REFERENCES:
patent: 3294772 (1966-12-01), Cottle
patent: 4740550 (1988-04-01), Foster
patent: 4740551 (1988-04-01), Foster
patent: 5326835 (1994-07-01), Ahvenainen et al.
patent: 5391654 (1995-02-01), Ahvenainen et al.
Spitz et al., Makromol. Chem., 190(1989) 707-716.
Sergeev et al., Makromol Chem., 190(1984) 2377-2385.

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