Michael L Chen

US Patent:

6476173, Nov 5, 2002

Filed:

Nov 7, 2000

Appl. No.:

09/707650

Inventors:

Chon-Yie Lin - Houston TX
Michael Chia-Chao Chen - Houston TX
Aspy Keki Mehta - Humble TX
Rajan K. Chudgar - League City TX

Assignee:

Exxon Mobil Chemical Patents Inc. - Houston TX

International Classification:

C08F11006

US Classification:

526351, 526160, 526943, 525240, 525242

Abstract:

This invention relates to isotactic propylene homopolymer compositions obtained from metallocene catalysis wherein the polymer has a molecular weight distribution (Mw/Mn) in the range of from about 2. 5 to about 20. The isototic propylene homopolymer composition may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages.

US Patent:

6576306, Jun 10, 2003

Filed:

Mar 6, 2001

Appl. No.:

09/800239

Inventors:

Aspy K. Mehta - Humble TX
Michael C. Chen - Houston TX
James J. McAlpin - Houston TX
Anthony N. Speca - Kingwood TX
Kelly Tormaschy - Round Rock TX
Chon Y. Lin - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

B32B 108

US Classification:

428 355, 428 357, 525240, 526348, 5263481

Abstract:

This invention relates generally to crystalline propylene polymers, to methods for their production and to methods for their use in film applications. Specifically, this invention relates to crystalline propylene polymers comprising both propylene homopolymer and propylene copolymer. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymer and copolymer using propylene with a small amount of comonomer, preferably ethylene. The polymerization is catalyzed by a dual metallocene catalyst system. The resulting polymers have a broad, bimodal molecular weight distribution. The resulting polymers are excellent for use in the production of biaxially oriented films or non-oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional propylene polymer.

US Patent:

6583227, Jun 24, 2003

Filed:

Mar 6, 2001

Appl. No.:

09/800238

Inventors:

Aspy K. Mehta - Humble TX
Michael C. Chen - Houston TX
James J. McAlpin - Houston TX
Anthony N. Speca - Kingwood TX
Kelly Tormaschy - Round Rock TX
Chon Y. Lin - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08L 2314

US Classification:

525240, 526348, 526943

Abstract:

This invention relates generally to crystalline propylene polymers, to methods for their production and to methods for their use in film applications. Specifically, this invention relates to crystalline propylene polymers comprising both propylene homopolymer and propylene copolymer. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymer and copolymer using propylene with a small amount of comonomer, preferably ethylene. The polymerization is catalyzed by a dual metallocene catalyst system. The resulting polymers have a broad, bimodal molecular weight distribution. The resulting polymers are excellent for use in the production of biaxially oriented films or non-oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional propylene polymer.

US Patent:

6784269, Aug 31, 2004

Filed:

Jun 20, 2002

Appl. No.:

10/177073

Inventors:

Chon Y. Lin - Houston TX
Michael C. Chen - Houston TX
Aspy K. Mehta - Humble TX
Rajan K. Chudgar - League City TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F21006

US Classification:

5263481, 526351, 526160, 526943

Abstract:

This invention relates to propylene homopolymer compositions obtained from metallocene catalysis wherein the polymer has a molecular weight distribution (Mw/Mn) in the range of from 4. 0 to 20. The propylene homopolymer composition may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages. The composition may comprise isotactic homopolymer in one embodiment, and have a hexane extractables of less than 2 wt % in one embodiment. The composition is useful in making films.

US Patent:

6806316, Oct 19, 2004

Filed:

Nov 25, 2002

Appl. No.:

10/303448

Inventors:

Aspy Keki Mehta - Humble TX
Michael Chia-Chao Chen - Houston TX
Chon-Yie Lin - Houston TX
James John McAlpin - Houston TX
Anthony Nicholas Speca - Kingwood TX
Kelly Tormaschy - Bellaire TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08L 2300

US Classification:

525240

Abstract:

This invention relates generally to crystalline polypropylene polymers and methods for their production. Specifically, this invention relates to crystalline polypropylene polymer compositions comprising both propylene homopolymers and propylene copolymers. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymers and copolymers using propylene with a small amount of comonomer, preferably ethylene. The resulting polymers are excellent for use in the production of biaxially oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional polypropylene polymers.

US Patent:

6809168, Oct 26, 2004

Filed:

Apr 2, 2003

Appl. No.:

10/406036

Inventors:

Pawan Kumar Agarwal - Houston TX
Weiqing Weng - Houston TX
Aspy K. Mehta - Humble TX
Armenag H. Dekmezian - Kingwood TX
Main Chang - Houston TX
Rajan K. Chudgar - League City TX
Olivier Jean Georjon - Brussels, BE
Chon-Yie Lin - Houston TX
Michael C. Chen - Bellaire TX
Galen C. Richeson - Kingwood TX
Palanisamy Arjunan - Houston TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F23620

US Classification:

526336, 526126, 526127, 526131, 526134, 526160, 526165, 526339

Abstract:

The co-polymerization reaction of one or more olefin monomers, such as propylene, with ,-diene units and the resulting copolymers are provided. More specifically, the copolymer may have from 90 to 99. 999 weight percent of olefins and from 0. 001 to 2. 000 weight percent of ,-dienes. The copolymer may have a weight average molecular weight in the range from 50,000 to 2,000,000, a crystallization temperature in the range from 115Â C. to 135Â C. and a melt flow rate in the range from 0. 1 dg/min to 100 dg/min. These copolymers may be employed in a wide variety of applications, the articles of which include, for example, films, fibers, such as spunbonded and meltblown fibers, fabrics, such as nonwoven fabrics, and molded articles. The copolymer may further include at least two crystalline populations. Desirably, the melting point range of one of the crystalline populations is distinguishable from the melting point range of another crystalline population by a temperature range of from 1Â C.

US Patent:

7026040, Apr 11, 2006

Filed:

Aug 31, 2004

Appl. No.:

10/930477

Inventors:

Aspy Keki Mehta - Humble TX, US
Michael Chia-Chao Chen - Houston TX, US
Chon-Yie Lin - Houston TX, US
James John Mcalpin - Houston TX, US
Anthony Nicholas Speca - Kingwood TX, US
Kelly Tormaschy - Bellaire TX, US

Assignee:

Exxon Mobil Chemical Patents Inc. - Houston TX

International Classification:

C08L 23/00
C08L 23/04
B32B 7/02

US Classification:

428212, 525240

Abstract:

This invention relates generally to films made from crystalline polypropylene polymers. Specifically, this invention relates to films comprising crystalline polypropylene polymer compositions containing both propylene homopolymers and propylene copolymers. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymers and copolymers using propylene with a small amount of comonomer, preferably ethylene. The resulting polymers are excellent for use in the production of biaxially oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional polypropylene polymers.

US Patent:

7098277, Aug 29, 2006

Filed:

Aug 22, 2001

Appl. No.:

10/343846

Inventors:

Chon-Yie Lin - Houston TX, US
Michael C-C Chen - Bellaire TX, US
Aspy K. Mehta - Humble TX, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 110/06
C08F 4/52
C08F 4/643

US Classification:

526134, 526135, 526160, 526348, 5263481, 526351

Abstract:

The present invention provides isotactic polypropylene compositions suitable for cast film applications, cast polypropylene films made therefrom, and processes for forming such films. The novel polypropylene films are formed from film resins having a melt flow ratio of from 6–15 dg/min, with a narrow molecular weight distribution, narrow composition distribution, low level of solvent extractables, and increased film clarity (i. e. , decreased haze %) compared to prior art Ziegler-Natta polypropylene film resins. The polypropylene films can be cast from an extruded polypropylene polymer, the extruded isotactic polypropylene polymer being formed by polymerization with a fluorided silica supported catalyst.