Fred L Vance

US Patent:

42858348, Aug 25, 1981

Filed:

Dec 31, 1979

Appl. No.:

6/108896

Inventors:

Kirby Lowery - Lake Jackson TX
Fred L. Vance - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 402
C08F 462
C08F 464

US Classification:

252429C

Abstract:

A catalyst mixture containing at least two independently supported catalysts, at least one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is an inorganic oxide supported, chromium catalyst. These catalyst mixtures are suitable for polymerizing one or more. alpha. -olefins.

US Patent:

42040507, May 20, 1980

Filed:

Nov 9, 1978

Appl. No.:

5/959287

Inventors:

Wilbur L. Bressler - Lake Jackson TX
Kirby Lowery - Lake Jackson TX
Fred L. Vance - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 478

US Classification:

526 97

Abstract:

alpha. -olefins are polymerized with a catalyst prepared from (1) an inert support, (2) the reaction product of a tetravalent hydrocarbyloxy titanium halide such as di-n-butoxy titanium dichloride and hexavalent chromium oxide and (3) an organometal activating agent such as a tri alkyl aluminum.

US Patent:

43626548, Dec 7, 1982

Filed:

May 14, 1981

Appl. No.:

6/263642

Inventors:

Fred L. Vance - Lake Jackson TX
Rafael E. Guerra - Lake Jackson TX
Christopher P. Christenson - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B01J 2106
B01J 2322
B01J 2326
B01J 2386

US Classification:

252469

Abstract:

Inorganic oxide supported chromium-containing catalysts are improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. Polymers resulting from polymerizing one or more. alpha. -olefins in the presence of such catalysts exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.

US Patent:

43211593, Mar 23, 1982

Filed:

Nov 13, 1978

Appl. No.:

5/959538

Inventors:

Wilbur L. Bressler - Lake Jackson TX
Kirby Lowery - Lake Jackson TX
Fred L. Vance - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 464

US Classification:

252429B

Abstract:

Dual transition metal compounds containing titanium and chromium are prepared by reacting a hydrocarbyloxy titanium halide with CrO. sub. 3. The compounds are useful in catalysts for the polymerization of. alpha. -olefins.

US Patent:

43760651, Mar 8, 1983

Filed:

Jun 1, 1981

Appl. No.:

6/269232

Inventors:

Randall S. Shipley - Alvin TX
Fred L. Vance - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 464

US Classification:

252429B

Abstract:

Dual transition metal compounds containing zirconium and chromium are prepared by reacting a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with a chromium compound such as CrO. sub. 3. These compounds, as well as combinations of other soluble chromium and zirconium compounds, are useful in the polymerization of. alpha. -olefins to produce polymers having a high molecular weight and a narrow molecular weight distribution.

US Patent:

42634229, Apr 21, 1981

Filed:

Dec 31, 1979

Appl. No.:

6/108721

Inventors:

Kirby Lowery - Lake Jackson TX
Fred L. Vance - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 402
C08F 478

US Classification:

526 97

Abstract:

Alpha-olefins are polymerized in the presence of at least two independently supported catalysts, one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is inorganic oxide supported, chromium catalyst. This dual catalyst increases catalyst efficiency and/or provides more flexible control of the properties of the resulting polymers.

US Patent:

43806163, Apr 19, 1983

Filed:

May 14, 1981

Appl. No.:

6/263647

Inventors:

Fred L. Vance - Lake Jackson TX
Rafael E. Guerra - Lake Jackson TX
Christopher P. Christenson - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 402
C08F 462

US Classification:

526101

Abstract:

Olefins are polymerized in the presence of chromium-containing catalysts which have been improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. The resulting polymers exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.

US Patent:

43813828, Apr 26, 1983

Filed:

Jun 1, 1981

Appl. No.:

6/269233

Inventors:

Randall S. Shipley - Alvin TX
Fred L. Vance - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 402
C08F 1000

US Classification:

526 97

Abstract:

Alpha-Olefins are polymerized in the presence of a catalyst which comprises (A) the reaction product of (1) a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with (2) a chromium compound such as CrO. sub. 3 ; (B) a solid catalyst support; (C) an organometallic activating agent or cocatalyst and (D) a trivalent or tetravelent titanium compound. The resultant polymers have a high molecular weight and a narrow molecular weight distribution.