George Alan Vaughan

US Patent:

6476171, Nov 5, 2002

Filed:

Oct 3, 2000

Appl. No.:

09/677756

Inventors:

Ching-Tai Lue - Houston TX
Natalie A. Merrill - Houston TX
Michael E. Muhle - Kingwood TX
George Alan Vaughan - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 442

US Classification:

526348, 526943, 526901, 526 88, 5263402, 5263482, 5263481, 526 68, 526 69

Abstract:

A polymer of ethylene and at least one alpha olefin having at least 5, carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence of an aluminum alkyl based scavenger which polymer has a Melt Index (MI) as herein defined of from 0. 1 to 15; a Compositional Distribution Breadth Index (CDBI) as defined herein of at least 70%, a density of from 0. 910 to 0. 930 g/ml; a Haze value as herein defined of less than 20%; a Melt Index ratio (MIR) as herein defined of from 35 to 80; an averaged Modulus (M) as herein defined of from 20 000 to 60 000 psi (pounds per square inch) and a relation between M and the Dart Impact Strength in g/mil (DIS) complying with the formula:.

US Patent:

6489413, Dec 3, 2002

Filed:

Jul 13, 2000

Appl. No.:

09/615296

Inventors:

Joseph C. Floyd - Baytown TX
Moses Olukayode Jejelowo - Kingwood TX
Donna Jean Crowther - Baytown TX
George Alan Vaughan - Houston TX
Ching Tai Lue - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 416

US Classification:

526160, 526129, 526159, 5263482, 5263485, 5263486

Abstract:

The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one -bonded ring having a C or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two -bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

US Patent:

6492473, Dec 10, 2002

Filed:

Aug 8, 2000

Appl. No.:

09/633303

Inventors:

Jo Ann Marie Canich - Webster TX
George Alan Vaughan - Houston TX
Phillip T. Matsunaga - Houston TX
David Edward Gindelberger - Bedminster NJ
Timothy Daniel Shaffer - Houston TX
Kevin Richard Squire - Kingwood TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 470

US Classification:

526117, 526114, 526115, 526116, 526160, 526161, 526170, 526172, 526943

Abstract:

The invention encompasses a mixed transition metal olefin polymerization catalyst system suitable for the polymerization of olefin monomers comprising one late transition metal catalyst system and at least one different catalyst system selected from the group consisting of late transition metal catalyst systems, transition metal metallocene catalyst systems or Ziegler-Natta catalyst systems. Preferred embodiments include at least one late transition metal catalyst system comprising a Group 9, 10, or 11 metal complex stabilized by a bidentate ligand structure and at least one transition metal metallocene catalyst system comprising a Group 4 metal complex stabilized by at least one ancillary cyclopentadienyl ligand. The polymerization process for olefin monomers comprises contacting one or more olefins with these catalyst systems under polymerization conditions.

US Patent:

6759499, Jul 6, 2004

Filed:

Sep 21, 1999

Appl. No.:

09/400568

Inventors:

Joseph C. Floyd - Baytown TX
Moses Olukayode Jejelowo - Kingwood TX
Donna Jean Crowther - Baytown TX
George Alan Vaughan - Houston TX
Ching Tai Lue - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F21000

US Classification:

526348, 526352, 5263486, 5263485

Abstract:

The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one -bonded ring having a C or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two -bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

US Patent:

6800704, Oct 5, 2004

Filed:

Apr 22, 2002

Appl. No.:

10/127984

Inventors:

Joseph C. Floyd - Baytown TX
Moses Olukayode Jejelowo - Kingwood TX
Donna Jean Crowther - Baytown TX
George Alan Vaughan - Houston TX
Ching Tai Lue - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 406

US Classification:

526126, 526127, 526160, 526170, 526348, 526352, 5263482, 5263483, 5263484, 5263485, 5263486, 5263487

Abstract:

The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one -bonded ring having a C or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two -bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

US Patent:

6812184, Nov 2, 2004

Filed:

Jun 17, 1997

Appl. No.:

08/877684

Inventors:

George Alan Vaughan - Houston TX
Jo Ann Marie Canich - Webster TX
Phillip T. Matsunaga - Houston TX
David Edward Gindelberger - Bedminster NJ
Kevin Richard Squire - Kingwood TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

B01J 3100

US Classification:

502117, 502155, 502162, 502167

Abstract:

A late transition metal catalyst system for polymerization of olefin monomers is a Group 9, 10 or 11 metal complex stabilized by a bidentate ligand immobilized on a solid support where the late transition metal loading is less than 100 micromoles transition metal compound per gram of solid support. The bidentate ligand has the formula: wherein A is a bridging group containing a Group 13-15 element; each E is independently a Group 15 or 16 element bonded to M; each R is independently a C -C containing radical or diradical group which is a hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, hydrocarbyl-substituted organometalloid, halocarbyl-substituted organometalloid, m and n are independently 1 or 2 depending on the valency of E; and p is the charge on the bidentate ligand.

US Patent:

6828394, Dec 7, 2004

Filed:

Jul 19, 2002

Appl. No.:

10/199808

Inventors:

George Alan Vaughan - Houston TX
John F. Szul - Nitro WV
Matthew Gary McKee - Blacksburg VA
James McLeod Farley - League City TX
Ching-Tai Lue - Houston TX

Assignee:

Univation Technologies, LLC - Houston TX

International Classification:

C08F 444

US Classification:

526114, 526113, 526118, 526119, 526126, 526161

Abstract:

The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer. In particular, the invention provides a catalyst system comprising a poor comonomer incorporating catalyst compound and a good comonomer incorporating catalyst compound. Preferably, the low comonomer incorporating catalyst compound is a metallocene containing at least one substituted or unsubstituted fused ring cyclopentadienyl based ligand which is substantially directed to the front of the molecule, contains a long bridging group, or which contains a methyl substitution pattern which correlates to poor comonomer incorporation. The invention also provides methods of selecting the poor comonomer incorporating metallocene to pair with the good comonomer incorporating metallocene to produce polymers that are easy to process into a variety of articles, especially polyethylene based film, having enhanced properties.

US Patent:

7060765, Jun 13, 2006

Filed:

Jul 19, 2002

Appl. No.:

10/199147

Inventors:

George Alan Vaughan - Houston TX, US
Laughlin G. McCullough - League City TX, US

Assignee:

Univation Technologies, LLC - Houston TX

International Classification:

C08F 4/64

US Classification:

526127, 526160, 526161, 526172, 526943

Abstract:

The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer. In particular, the invention relates to identifying the comonomer incorporation behavior of metallocene polymerization catalyst compounds. More particularly, the invention relates to identifying metallocene catalyst compounds which incorporate comonomer poorly. Preferably, such metallocene catalyst compounds contain at least one substituted or unsubstituted fused ring cyclopentadienyl based ligand. The invention also relates to the use of these low comonomer incorporating metallocene catalyst compounds in catalyst systems to produce polymers that are easy to process into a variety of articles, especially polyethylene based film, having enhanced properties.