Process for the preparation of a polymerization and copolymeriza

Details Process for the preparation of a polymerization and copolymeriza Process for the preparation of a polymerization and copolymeriza

1998-01-22

2000-09-05

Wu, David W.

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

Catalyst or precursor therefor

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

502104, 5261231, 526352, 526908, 526909, B01J 2110

Patent

active

061142719

ABSTRACT:
Process for the preparation of a catalyst component for the polymerization and copolymerization of ethylene to give ultrahigh-molecular-weight ethylene polymers. Reaction of a Grignard compound with a halogenating agent, a titanium compound, a perhalogen compound and an electron-donor compound and subsequent comminution of the resultant solid to a mean particle size of from 0.5 to 5 .mu.m gives a catalyst component which, together with an organoaluminum compound, results, in the polymerization and copolymerization of ethylene, in ultrahigh-molecular-weight ethylene polymers having a mean particle diameter of from 50 to 200 .mu.m and a viscosity index of greater than 2,000 cm.sup.3 /g. The mean particle diameter can be adjusted by means of the catalyst particle diameter and by means of the catalyst productivity.

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patent: 4933393 (1990-06-01), Toyota et al.
patent: 4962167 (1990-10-01), Shiraishi et al.
patent: 5349033 (1994-09-01), Thum

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