Phillips Petroleum Company

Other

Williams, Phillips & Umphlett

James N Short

Max P McDaniel

M Bruce Welch

Richard E Dietz

Donald R Witt

Charles E Capshew

Kenneth W Willcox

Donald D Norwood

John W Marx

A catalyst system useful for the polymerization of ethylene and other .alpha.-olefins comprising (a) a silica-supported chromium oxide catalyst and (b) a dihydrocarbylboron monohydrocarbyloxide adjuvant. The catalyst system results in .alpha.-olefin polymers having a broadened molecular weight distribution in the high molecular portion.

Supported chromium oxide/boron catalyst

Polymerization of olefins in the presence of a catalyst system comprising a titanium-containing component A associated with a chemically treated silica-containing composition and a dihydrocarbylmagnesium compound and a cocatalyst component B comprising metal hydride or organometal compound derived from an element of Groups IA-IIIA of the Periodic Table.

Polymerization and catalysts

Polymerization process utilizing a silica-supported chromium oxide

In accordance with one embodiment of this invention, a bis-(cyclopentadienyl)chromium(II) compound is introduced onto an activated phosphate-containing support and utilized in conjunction with an organometal cocatalyst, such as an alkylaluminum. In accordance with another embodiment of this invention, a phosphate-containing zerogel is formed by removing water from an aluminum phosphate-containing hydrogel by means of azeotropic distillation or washing with a volatile, water mis-cible organic compound, activated and thereafter a bis-(cyclopentadienyl)chromium(II) compound is incorporated therewith. In other embodiments of this invention, a phosphate-containing support is formed by forming aluminum phosphate from an aluminum alkoxide or from a melt, or by phosphating silica or alumina, or by forming an aluminum phosphate/silica combination. A support thus formed is activated and a bis-(cyclopentadienyl)chromium(II) compound added. Alternatively in all embodiments, the chromium and phosphate components can be added separately. The resulting catalysts are capable of giving narrow molecular weight distribution polymer because of the inherent high molecular weight of the polymer produced, and the unusual sensitivity to hydrogen, a broad spectrum of polymers can be produced so far as molecular weight is concerned. The catalyst is ideally suited for forming olefin polymers such as ethylene and ethylene copolymers in a slurry system.

Ethylene polymer produced using a catalyst comprising a phosphate and

In accordance with one embodiment of this invention, a bis-(cyclopentadienyl)chromium(II) compound is introduced onto an activated phosphate-containing support and utilized in conjunction with an organometal cocatalyst, such as an alkylaluminum. In accordance with another embodiment of this invention, a phosphate-containing xerogel is formed by removing water from an aluminum phosphate-containing hydrogel by means of azeotropic distillation or washing with a volatile, water miscible organic compound, activated and thereafter a bis-(cyclopentadienyl)chromium(II) compound is incorporated therewith. In other embodiments of this invention, a phosphate-containing support is formed by forming aluminum phosphate from an aluminum alkoxide or from a melt, or by phosphating silica or alumina, or by forming an aluminum phosphate/silica combination. A support thus formed is activated and a bis-(cyclopentadienyl)chromium(II) compound added. Alternatively in all embodiments, the chromium and phosphate components can be added separately. The resulting catalysts are capable of giving narrow molecular weight distribution polymer because of the inherent high molecular weight of the polymer produced, and the unusual sensitivity to hydrogen, a broad spectrum of polymers can be produced so far as molecular weight is concerned. The catalyst is ideally suited for forming olefin polymers such as ethylene and ethylene copolymers in a slurry system.

Polymerization process using a catalyst comprising a phosphate and with

In accordance with one embodiment of this invention, a bis-(cyclopentadienyl)chromium(II) compound is introduced onto an activated phosphate-containing support and utilized in conjunction with an organometal cocatalyst, such as an alkylaluminum. In accordance with another embodiment of this invention, a phosphate-containing zerogel is formed by removing water from an aluminum phosphate-containing hydrogel by means of azeotropic distillation or washing with a volatile, water miscible organic compound, activated and thereafter a bis-(cyclopentadienyl)chromium(II) compound is incorporated therewith. In other embodiments of this invention, a phosphate-containing support is formed by forming aluminum phosphate from an aluminum alkoxide or from a melt, or by phosphating silica or alumina, or by forming an aluminum phosphate/silica combination. A support thus formed is activated and a bis-(cyclopentadienyl)chromium(II) compound added. Alternatively in all embodiments, the chromium and phosphate components can be added separately. The resulting catalysts are capable of giving narrow molecular weight distribution polymer because of the inherent high molecular weight of the polymer produced, and the unusual sensitivity to hydrogen, a broad spectrum of polymers can be produced so far as molecular weight is concerned. The catalyst is ideally suited for forming olefin polymers such as ethylene and ethylene copolymers in a slurry system.

Catalyst comprising a phosphate and with a

Stabilization of polymer blends with metal nitrites

A transition metal compound and a metal halide compound are chemically combined to form a composition of matter. The composition of matter is rapidly mixed with a precipitating agent to form an active olefin polymerization catalyst.

Catalyst, method of producing the catalyst, and polymerization process

A transition metal compound and a metal halide compound are chemically combined to form a composition of matter. The composition of matter is rapidly mixed with a precipitating agent to form an active olefin polymerization catalyst under an olefin atmosphere and prepolymer is formed on said catalyst to yield a catalyst capable of producing low fines content polymer.

A method for continuous production of block copolymers having a block of propylene homopolymer and blocks of polymer of ethylene. The block copolymers produced thereby. In a first stage a first reaction mixture containing a polymer of ethylene is produced with continuous transfer of a portion of this reaction mixture along with propylene monomer and a catalyst modifier into a second stage in which a block copolymer having a block of propylene homopolymer and blocks of polymer of ethylene is produced. In preferred embodiments the polymer of ethylene is ethylene homopolymer and/or ethylene-propylene random copolymer.

Continuous production of olefin block copolymers

A method is provided for treating a hydrogel with a saturated, aliphatic alcohol selected from the group consisting of 1-pentanol, 2-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol to remove water thereby producing a dried product that retains a porous structure and is particularly suitable upon impregnation with a polymerization catalyst for use in promoting the production of ethylene polymers of melt index in excess of about 6.6.

Catalyst support prepared by alcohol treatment of hydrogels

Polymers containing internal unsaturation are modified by treatment with a lower molecular weight olefin in the presence of an olefin disproportionation catalyst.

Modification of polymers by treatment with olefins

Opalescent-appearing compositions are prepared by dispersing conjugated diene/vinyl aromatic compound copolymers in a suitable solvent. Encapsulated compositions of this invention display the colors and brilliance of precious opal.

Growing community of inventors

Bartlesville, OK, United States of America

James N Short