George S Vaughan

US Patent:

57672083, Jun 16, 1998

Filed:

Dec 18, 1996

Appl. No.:

8/769191

Inventors:

Howard William Turner - Cupertino CA
George Alan Vaughan - Houston TX
Richard Allen Fisher - League City TX
John Flexer Walzer - Seabrook TX
Charles Stanley Speed - Dayton TX
Bernard Jean Folie - Houston TX
Donna Jean Crowther - Baytown TX

Assignee:

Exxon Chemical Patents Inc. - Houston TX

International Classification:

C08F 4643
C08F 204
C08F21018

US Classification:

526160

Abstract:

A polymerization process for olefinically or acetylenically unsaturated monomers is disclosed. The process comprises contacting the one or more of the monomers with a suitable ionic catalyst system in the presence of a long-chain, linear alkyl ligand-containing organo aluminum compound. Preferred ionic catalysts are derived from 1) bridged hafnium compounds, 2) silicon bridged monocyclopentadienyl titanium compounds and 3) unbridged, bulky Group 15 containing, bulky monocyclopentadienyl titanium compounds, and a non-coordinating anion precursor compound. A class of preferred anion precursors consists of hydrated salts comprising a Group 1 or 2 cation and a non-coordinating anion. Using the preferred ionic catalysts high temperature processes, e. g. , at or above 90. degree. C. can be conducted to prepare polyolefins, particularly ethylene copolymers, of both high molecular weight and high comonomer content.

US Patent:

59070218, May 25, 1999

Filed:

Mar 26, 1998

Appl. No.:

9/048293

Inventors:

Howard William Turner - Cupertino CA
Charles Stanley Speed - Dayton TX
Bernard Jean Folie - Houston TX
Donna Jean Crowther - Baytown TX
George Alan Vaughan - Houston TX
Richard Allen Fisher - League City TX
John Flexer Walzer - Seabrook TX

Assignee:

Exxon Chemical Patents Inc. - Houston TX

International Classification:

C08F 4642

US Classification:

526160

Abstract:

A polymerization process for olefinically or acetylenically unsaturated monomers is disclosed. The process comprises contacting the one or more of the monomers with a suitable ionic catalyst system in the presence of a long-chain, linear alkyl ligand-containing organo aluminum compound. Preferred ionic catalysts are derived from 1) bridged hafnium compounds, 2) silicon bridged monocyclopentadienyl titanium compounds and 3) unbridged, bulky Group 15 containing, bulky monocyclopentadienyl titanium compounds, and a non-coordinating anion precursor compound. A class of preferred anion precursors consists of hydrated salts comprising a Group 1 or 2 cation and a non-coordinating anion. Using the preferred ionic catalysts high temperature processes, e. g. , at or above 90. degree. C. can be conducted to prepare polyolefins, particularly ethylene copolymers, of both high molecular weight and high comonomer content.