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US 5,670,438 AGranted
Catalyst compositions and catalytic processes
AssigneePhillips Petroleum Company
InventorRickey D. Badley
Life of this patent
Estimating the term…
Abstract
Catalyst compositions are provided that comprise (a) discrete silica particles; (b) chromium; and (c) a support comprising silica. These composition are useful in polymerizing ethylene or copolymerizing ethylene with a comonomer and provide better control over the molecular weight and the molecular weight distribution of a resulting polymer.
Claims9
A catalyst composition comprising:
- (a) discrete silica particles, wherein raid discrete silica particles are produced by the process consisting essentially of contacting together, in the absence of an acid, a tetraalkoxysilane composition, an alcohol composition, an ammonia composition, and water;
- (b) chromium;
- and
- (c) a support comprising silica.
1 more element
A catalyst composition produced by the process comprising:
- (a) contacting together, in the absence of an acid, a tetraalkoxysilane composition, an alcohol composition, an ammonia composition, and water to form discrete silica particles and then producing a mixture of said discrete silica particles and chromium;
- and then
- (b) contacting said mixture of discrete silica particles and chromium with a composition that comprises chromium and a support.
A catalyst composition produced by the process comprising:
- (a) contacting together, in the absence of an acid, a tetraalkoxysilane composition, an alcohol composition, an ammonia composition, and water to form discrete silica particles;
- and then
- (b) contacting said discrete silica particles with a support that comprises silica to form a discrete silica particle/support composition;
- and then
- (c) contacting said discrete silica particle/support composition with chromium.
2 more elements
Dependencies are inferred from the claim text.