Solution process for the preparation of polymers of .alpha.-olef

Details Solution process for the preparation of polymers of .alpha.-olef Solution process for the preparation of polymers of .alpha.-olef

Filed on

1994-02-01

Date issued

1996-02-20

Examiner

Pal, Asok

Patent Class

Catalyst, solid sorbent, or support therefor: product or process

SubClass

Catalyst or precursor therefor

SubSubClass

Plural component system comprising a - group i to iv metal...

Other Related Categories

502107, 502110, 502119, 502125, 502126, 526116, B01J 3136, B01J 3138

Type

Patent

Status

active

Patent number

054928761

Description

ABSTRACT:
A solution process, and a catalyst therefor, for the preparation of high molecular weight polymers of alpha-olefins viz. homopolymers of ethylene and copolymers of ethylene and C.sub.3 -C.sub.12 alpha-olefins, is disclosed. The process is operated under solution polymerization conditions at 105.degree.-320.degree. C. The catalyst is obtained from titanium tetrahalides, vanadium oxytrihalides and organoaluminum compounds, in which an admixture of catalyst components is heat-treated at 180.degree.-250.degree. C. and subsequently cooled to a temperature of less than 150.degree. C. Additional vanadium oxytrihalide is then added. The resultant catalyst solution is activated with an aluminum compound. The catalyst has good activity, showing superior activity to catalysts in which additional vanadium oxytrihalide is not added or added at temperatures above 150.degree. C.

REFERENCES:
patent: 4008358 (1977-02-01), Abe et al.
patent: 4483938 (1984-11-01), Rees
patent: 4537869 (1985-08-01), McDaniel
patent: 4704376 (1987-11-01), Blenkers et al.
patent: 4769428 (1988-09-01), Zboril et al.
patent: 4831000 (1989-05-01), Miro

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