Donn A Dubois

US Patent:

6420490, Jul 16, 2002

Filed:

Nov 24, 1999

Appl. No.:

09/448664

Inventors:

Donn Anthony DuBois - Houston TX

Assignee:

KRATON Polymers U.S. LLC - Houston TX

International Classification:

C08F 832

US Classification:

525338, 5253303, 5253305, 5253306, 525379, 525388

Abstract:

A low molecular weight, telechelic polymer containing polar internal functionality is produced by (a) treating a copolymer of a polar alpha olefin and a conjugated diene with ozone to degrade the copolymer and form polymer segments which have aldehyde or ketone groups on the chain ends, wherein the copolymer has a random distribution of predominantly 1,4-diene double bonds and the pendant functional groups of the polar alpha olefin are stable to ozone, and (b) further reacting the aldehyde or ketone end groups to provide terminal functionality. The terminal functionality which can be provided includes carboxylic acid groups, primary hydroxyl groups, and amide groups.

US Patent:

6441224, Aug 27, 2002

Filed:

Aug 22, 2000

Appl. No.:

09/643353

Inventors:

Thomas Fairchild Brownscombe - Houston TX
Donn Anthony DuBois - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Stafford TX

Assignee:

Mossi Ghisolfi Overseas, S. A.

International Classification:

C07C 51347

US Classification:

562423, 562481, 562482

Abstract:

Disclosed is a method for selective carboxylation of naphthoic acid, or other aromatic mono-acids to form primarily 2,3-naphthalene dicarboxylic acid (2,3-NDA) or other aromatic diacids which comprises reacting said aromatic mono-acid in the presence of one or more metal oxide catalysts, alone, or in combination, and in the presence of about 0. 2 to 0. 8 moles excess of base over aromatic mono-acid, at a temperature of about 380Â C. to about 420Â C. , and, in a second step, disproportionating the product of said selective carboxylation at a temperature above about 420Â C. to form a product with a greatly improved yield of 2,6-naphthalene dicarboxylic acid, or other aromatic dicarboxylic acid.

US Patent:

6448436, Sep 10, 2002

Filed:

Aug 22, 2000

Appl. No.:

09/644003

Inventors:

Keith Michael Kreitman - Houston TX
Steve Edward Brewer - Houston TX
John Bernard Rodden - Houston TX
Robert Lawrence Blackbourn - Houston TX
Thomas Fairchild Brownscombe - Houston TX
James Laurel Buechele - Houston TX
Ye-Mon Chen - Sugar Land TX
Zaida Diaz - Houston TX
Donn Anthony DuBois - Houston TX
Raymond Lawrence June - Singapore, SG
Brendan Dermot Murray - Houston TX
Michael Wayne Potter - Sugar Land TX

Assignee:

Mossi Ghisolfi Overseas, S. A. - Luxembourg

International Classification:

C07C 51265

US Classification:

562412, 562414

Abstract:

Disclosed is an integrated process for producing 2,6-naphthalene dicarboxylicacid comprising oxidizing a methylnaphthalene feedstock, hydrodebrominating the crude naphthoic acid product under conditions different from any work known in the art, forming a potassium salt of the acid; disproportionating the potassium salt to produce 2,6 potassium salts of NDA; selectively precipitating K NDA; selectively precipitating the monopotassium salt of 2,6 NDA(KHNDA); disproportionating the KHNDA into 2,6 NDA and K2NDA; further reacting the 2,6 NDA in a pipe reactor; and drying the product 2,6 NDA by conventional means or directly slurrying directly into a PEN process. The process can tolerate impurities in the economical methylnaphthalene feed and the resulting 2,6 NDA is of high quality with 50 ppm potassium.

US Patent:

6448437, Sep 10, 2002

Filed:

Aug 22, 2000

Appl. No.:

09/643398

Inventors:

Donn Anthony DuBois - Houston TX
Brendan Dermot Murray - Houston TX

Assignee:

Mossi Ghisolfi Overseas S.A. - Luxemborg

International Classification:

C02C 51347

US Classification:

562481

Abstract:

Disclosed are halide-free catalyst compositions for the disproportionation/isomerization of aromatic carboxylic acid salts. In one embodiment the catalyst comprises a mixed catalyst of compounds of copper, zinc, and zirconium; and, in a second embodiment, the catalyst comprises a copper compound treated with a base, optionally used with a promoter. Both halide-free catalysts provide advantages with respect to metallurgic problems, as well as good stability, activity and selectivity, and the later is faster kinetically at lower temperatures.

US Patent:

6452045, Sep 17, 2002

Filed:

Aug 22, 2000

Appl. No.:

09/643518

Inventors:

Thomas Fairchild Brownscombe - Houston TX
James Laurel Buechele - Houston TX
Donn Anthony DuBois - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Sugar Land TX

Assignee:

M G USA Corporation - Akron OH

International Classification:

C07C 51347

US Classification:

562481, 562488, 562490, 562492

Abstract:

Disclosed is a process for disproportionation of potassium naphthoate to the dipotassium salt of 2,6-NDA which gives reproducible improved yields of up to 40% which comprises: a) reacting naphthoic acid in the presence of excess base to produce a disproportionation feed comprising a finely dispersed disordered salt mixture of excess base salts and naphthoic acid salts, wherein the feed is prepared by the steps of: (1) Reacting naphthoic acid in the presence of excess base selected from the group consisting of carbonates and bicarbonates to form a salt; (2) Drying said salt mixture by a method which forms a highly mixed disordered salt mixture characterized by a differential scanning calorimeter(DSC) signature characterized by low melting peaks not previously observed in the salt; and b) Disproportionating said solid salts in the presence of a disproportionation catalyst to form the dipotassium salts of 2,6-NDA.

US Patent:

6479699, Nov 12, 2002

Filed:

Jul 3, 2001

Appl. No.:

09/898890

Inventors:

Thomas Fairchild Brownscombe - Houston TX
Donn Anthony DuBois - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Stafford TX

Assignee:

Mossi Ghisolfi Overseas S.A.

International Classification:

C07C 51347

US Classification:

562481, 562482, 562488

Abstract:

Disclosed is a method for selective carboxylation of naphthoic acid, or other aromatic mono-acids to form primarily 2,3-naphthalene dicarboxylic acid (2,3-NDA) or other aromatic diacids which comprises reacting said aromatic mono-acid in the presence of one or more metal oxide catalysts, alone, or in combination, and in the presence of about 0. 2 to 0. 8 moles excess of base over aromatic mono-acid, at a temperature of about 380Â C. to about 420Â C. , and, in a second step, disproportionating the product of said selective carboxylation at a temperature above about 420Â C. to form a product with a greatly improved yield of 2,6-naphthalene dicarboxylic acid, or other aromatic dicarboxylic acid.

US Patent:

7012118, Mar 14, 2006

Filed:

Oct 8, 2003

Appl. No.:

10/681608

Inventors:

David Romme Hansen - Houston TX, US
David John St. Clair - Houston TX, US
Donn Anthony Dubois - Houston TX, US
Carl Lesley Willis - Houston TX, US

Assignee:

KRATON Polymers U.S. LLC - Houston TX

International Classification:

C08F 297/04

US Classification:

525 88, 525 89, 525316, 525380, 525338, 525258

Abstract:

The present invention relates to a photopolymerizable composition, which comprises:The invention also includes flexographic printing plates derived from said photopolymerizable compositions, and flexographic printing relief forms prepared from said plates.

US Patent:

7241540, Jul 10, 2007

Filed:

Apr 27, 2004

Appl. No.:

10/832733

Inventors:

David J. St. Clair - Houston TX, US
David R. Hansen - Houston TX, US
Donn A. Dubois - Houston TX, US

Assignee:

Kraton Polymers U.S. LLC - Houston TX

International Classification:

G03F 7/033

US Classification:

430 18, 4302861, 4302871, 430306, 4302851, 4302811

Abstract:

The present invention relates to photocurable compositions for use in flexographic printing plates comprising selectively hydrogenated block copolymers of conjugated dienes and monoalkenyl arenes and flexographic printing plates made from the same. The block copolymers, either linear or radial, have terminal blocks of unsaturated conjugated diene. The block copolymer is further comprised of monoalkenyl arene blocks and hydrogenated conjugated diene blocks. The compositions exhibit exceptional improvement in degree of cure over comparative selectively hydrogenated block copolymers.

Address:

14310 Cindywood Dr, Houston, TX 77079

Phone:

2814975187

VIN:

3N1BC13E99L380620

Make:

NISSAN

Model:

VERSA

Year:

2009