Process for the preparation of polyethylene which has a broad mo

Details Process for the preparation of polyethylene which has a broad mo Process for the preparation of polyethylene which has a broad mo

1997-09-12

2000-05-16

Teskin, Fred

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

Synthetic resins

Polymerizing in tubular or loop reactor

526 65, 526 73, 526106, 5263485, C08F 469, C08F 214, C08F21014

Patent

active

060638788

ABSTRACT:
Process for the preparation of polyethylene by the homopolymerization of ethylene or by the copolymerization of ethylene and of at least one alpha-olefinic comonomer containing from 3 to 10 carbon atoms, in two reactors for loop polymerization in liquid phase which are connected in series in the presence of a chromium catalyst, in which ethylene and the chromium catalyst are first introduced into the first reactor at a temperature of 95 to 110.degree. C. to produce an ethylene homopolymer of low molecular weight of a melt index MI.sub.2 of at least 1 g/10 minutes and in which the ethylene homopolymer thus obtained is next transferred into the second reactor to which ethylene and optionally the alpha-olefinic comonomer is added, at a temperature of 80 to 90.degree. C. to obtain an ethylene copolymer of high molecular weight.

REFERENCES:
patent: 3392213 (1968-07-01), Berger
patent: 5648439 (1997-07-01), Bergmeister et al.

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