Robert Scott Cardwell

US Patent:

6448341, Sep 10, 2002

Filed:

Aug 24, 2000

Appl. No.:

09/645731

Inventors:

Brian W. S. Kolthammer - Lake Jackson TX
Robert S. Cardwell - Lake Jackson TX
Ronald P. Markovich - Houston TX
Bharat I. Chaudhary - Pearland TX
Adam E. Laubach - Lake Jackson TX
Jesus Nieto - Tarragona, ES

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 2308

US Classification:

525240, 264310, 26433117

Abstract:

Film, molded articles and fibers prepared from ethylene/-olefin interpolymer compositions are disclosed. The interpolymer compositions are blends prepared by combining specified amounts of a narrow molecular weight distribution, narrow composition distribution breadth index interpolymer, and a broad molecular weight distribution, broad composition distribution breadth index interpolymer, with each blend component having a specified density, melt index and degree of branching.

US Patent:

6566446, May 20, 2003

Filed:

Sep 18, 1997

Appl. No.:

08/932771

Inventors:

Deepak R. Parikh - Baton Rouge LA
Robert S. Cardwell - Lake Jackson TX
Brian W. S. Kolthammer - Lake Jackson TX

Assignee:

Dow Global Technologies Inc. - Midland MI

International Classification:

C08F 4642

US Classification:

525 53, 525240, 525322, 525324

Abstract:

A new process of interpolymerizing ethylene interpolymer products having improved properties, such as increased onset of crystallization temperature, is disclosed. Preferably, the process comprises interpolymerizing a first homogeneous ethylene/alpha-olefin interpolymer and at least one second homogeneous ethylene/alpha-olefin interpolymer using at least two constrained geometry catalysts having different reactivities such that the first ethylene/alpha-olefin interpolymer has a narrow molecular weight distribution (NMWD) with a very high comonomer content and relatively high molecular weight and the second ethylene/alpha-olefin interpolymer has a NMWD with a low comonomer content and a molecular weight lower than that of the first interpolymer. The resultant first homogeneous interpolymer is combined with the resultant second homogeneous interpolymer in appropriate weight ratios resulting in the desired finished polymer structure. The first interpolymer and the second interpolymer can be polymerized in a single reactor or they can be polymerized in separate reactors operated in parallel or series.

US Patent:

6538070, Mar 25, 2003

Filed:

May 19, 1997

Appl. No.:

08/858664

Inventors:

Robert S. Cardwell - Lake Jackson TX
Brian W. S. Kolthammer - Lake Jackson TX
Deepak R. Parikh - Baton Rouge LA

Assignee:

Dow Global Technologies Inc. - Midland MI

International Classification:

C08L 2308

US Classification:

525240

Abstract:

A new process of interpolymerizing ethylene interpolymer products having improved properties, such as increased onset of crystallization temperature, is disclosed. Preferably, the process comprises interpolymerizing a first homogeneous ethylene/alpha-olefin interpolymer and at least one second homogeneous ethylene/alpha-olefin interpolymer using at least two constrained geometry catalysts having different reactivities such that the first ethylene/alpha-olefin interpolymer has a narrow molecular weight distribution (NMWD) with a very high comonomer content and relatively high molecular weight and the second ethylene/alpha-olefin interpolymer has a NMWD with a low comonomer content and a molecular weight lower than that of the first interpolymer. The resultant first homogeneous interpolymer is combined with the resultant second homogeneous interpolymer in appropriate weight ratios resulting in the desired finished polymer structure. The first interpolymer and the second interpolymer can be polymerized in a single reactor or they can be polymerized in separate reactors operated in parallel or series.

US Patent:

6545088, Apr 8, 2003

Filed:

Jul 12, 1996

Appl. No.:

08/679538

Inventors:

Brian W. S. Kolthammer - Lake Jackson TX
Robert S. Cardwell - Lake Jackson TX
Deepak R. Parikh - Lake Jackson TX
Morris S. Edmondson - Alvin TX
Stanley W. Smith - Lake Jackson TX

Assignee:

Dow Global Technologies Inc. - Midland MI

International Classification:

C08F 214

US Classification:

525 53, 525232, 525322, 525324, 526126, 526134

Abstract:

Ethylene, an -olefin and, optionally, a diene monomer are polymerized in a process comprising the step of contacting (1) ethylene, (2) at least one C -C aliphatic -olefin, (3) optionally, at least one C -C diene, (4) a catalyst comprising (a) a metallocene complex, and (b) an activator, and (5) a solvent. The process is conducted in either a single reactor or in multiple reactors, the latter configured either in series or parallel. Solvent is removed from the polymer stream in an anhydrous, first stage solvent recovery operation such that the solids concentration of the product stream is increased by at least 100 percent. Additional solvent is removed in an anhydrous, second stage solvent recovery operation from the product of the first stage solvent recovery operation such that the solids concentration of the product stream is in excess of 65 weight percent.

US Patent:

6916883, Jul 12, 2005

Filed:

Sep 1, 2004

Appl. No.:

10/931821

Inventors:

Deepak R. Parikh - Baton Rouge LA, US
Brian W. S. Kolthammer - Lake Jackson TX, US
Robert S. Cardwell - Lake Jackson TX, US

Assignee:

Dow Global Technologies Inc. - Midland MI

International Classification:

C08F008/00
C08F210/00
C08L023/00
C08L023/04

US Classification:

525191, 525240, 526348

Abstract:

A new process of interpolymerizing ethylene interpolymer products having improved properties, such as increased onset of crystallization temperature, is disclosed. Preferably, the process comprises interpolymerizing a first homogeneous ethylene/alpha-olefin interpolymer and at least one second homogeneous ethylene/alpha-olefin interpolymer using at least two constrained geometry catalysts having different reactivities such that the first ethylene/alpha-olefin interpolymer has a narrow molecular weight distribution (NMWD) with a very high comonomer content and relatively high molecular weight and the second ethylene/alpha-olefin interpolymer has a NMWD with a low comonomer content and a molecular weight lower than that of the first interpolymer. The resultant first homogeneous interpolymer is combined with the resultant second homogeneous interpolymer in appropriate weight ratios resulting in the desired finished polymer structure. The first interpolymer and the second interpolymer can be polymerized in a single reactor or they can be polymerized in separate reactors operated in parallel or series.

US Patent:

20030149181, Aug 7, 2003

Filed:

Sep 6, 2002

Appl. No.:

10/236543

Inventors:

Brian Kolthammer - Lake Jackson TX, US
Robert Cardwell - Lake Jackson TX, US
Ronald Markovich - Houston TX, US
Bharat Chaudhary - Pearland TX, US
Adam Laubach - Lake Jackson TX, US
Jesus Nieto - Cambrils, ES

International Classification:

C08L023/08

US Classification:

525/240000, 264/310000, 264/331170

Abstract:

Film, molded articles and fibers prepared from ethylene/-olefin interpolymer compositions are disclosed. The interpolymer compositions are blends prepared by combining specified amounts of a narrow molecular weight distribution, narrow composition distribution breadth index interpolymer, and a broad molecular weight distribution, broad composition distribution breadth index interpolymer, with each blend component having a specified density, melt index and degree of branching.

US Patent:

20030166784, Sep 4, 2003

Filed:

Jan 20, 2003

Appl. No.:

10/348109

Inventors:

Deepak Parikh - Baton Rouge LA, US
Robert Cardwell - Lake Jackson TX, US
Brian Kolthammer - Lake Jackson TX, US

International Classification:

C08L023/08

US Classification:

525/240000

Abstract:

A new process of interpolymerizing ethylene interpolymer products having improved properties, such as increased onset of crystallization temperature, is disclosed. Preferably, the process comprises interpolymerizing a first homogeneous ethylene/alpha-olefin interpolymer and at least one second homogeneous ethylene/alpha-olefin interpolymer using-at least two constrained geometry catalysts having different reactivities such that the first ethylene/alpha-olefin interpolymer has a narrow molecular weight distribution (NMWD) with a very high comonomer content and relatively high molecular weight and the second ethylene/alpha-olefin interpolymer has a NMWD with a low comonomer content and a molecular weight lower than that of the first interpolymer. The resultant first homogeneous interpolymer is combined with the resultant second homogeneous interpolymer in appropriate weight ratios resulting in the desired finished polymer structure. The first interpolymer and the second interpolymer can be polymerized in a single reactor or they can be polymerized in separate reactors operated in parallel or series.

US Patent:

58695753, Feb 9, 1999

Filed:

Nov 24, 1997

Appl. No.:

8/980695

Inventors:

Brian W. S. Kolthammer - Lake Jackson TX
Robert S. Cardwell - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 2308

US Classification:

525240

Abstract:

Processes for polymerizing ethylene/. alpha. -olefin interpolymer compositions are disclosed. The interpolymer compositions have a controlled composition and a controlled molecular weight distribution. The processes utilize a highly-efficient homogeneous catalyst composition in at least one reactor to produce a first interpolymer having a narrow composition distribution and a narrow molecular weight distribution, and a highly-efficient heterogeneous Ziegler catalyst in at least one other reactor. The reactors can be operated sequentially or separately, depending upon the desired product. The novel compositions have good optical properties (e. g. , clarity and haze) and good physical properties (e. g. , modulus, yield strength, toughness and tear). Useful products which can be formed from these compositions include film, molded articles and fiber.