Process for the preparation of a polymerization and copolymerization of ethylene to give ultrahigh molecular-weight ethylene polymers
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United States of America Patent
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Sep 5, 2000
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Jan 22, 1998
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Jan 22, 1998
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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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