Kien V Phung

US Patent:

20090163658, Jun 25, 2009

Filed:

Dec 19, 2008

Appl. No.:

12/317114

Inventors:

Florin Barsan - Pearland TX, US
Kien Van Phung - Pearland TX, US
Jeffrey Hunt Thompson - Friendswood TX, US

International Classification:

C08G 63/91

US Classification:

525 62

Abstract:

A process is provided for the manufacture of polyvinyl alcohol, having an APHA color of equal to or less than about 10, by polymerizing a vinyl acetate monomer to form polyvinyl acetate and then hydrolyzing the polyvinyl acetate to form polyvinyl alcohol wherein the vinyl acetate monomer is characterized as having an inhibitor level of equal to or less than about 10 ppm, preferably less than about 5 ppm, more preferably less than about 3 ppm, even more preferably less than about 1 ppm.

US Patent:

20110160418, Jun 30, 2011

Filed:

Sep 11, 2009

Appl. No.:

12/998026

Inventors:

Richard Vicari - Pearland TX, US
Florin Barsan - Pearland TX, US
Kien Van Phung - Pearland TX, US

International Classification:

C08F 226/02

US Classification:

526312

Abstract:

Disclosed herein is a water-soluble copolymer formed by copolymerizing N-vinylformamide and one or more vinyl C-Calkyl esters, and then hydrolyzing from 30 to 100 mol % of the formyl groups from the copolymerized units to form amino groups and from 30 to 100 mol % of the C-Calkyl ester groups from the copolymerized units to form hydroxyl groups, wherein the copolymer has a unimodal molecular weight distribution as evidenced by essentially one peak in a gel permeation gradient elution chromatographic analysis. A process to produce the polymer is also disclosed.

US Patent:

20130158289, Jun 20, 2013

Filed:

Dec 15, 2011

Appl. No.:

13/327401

Inventors:

Joseph G. Duff - League City TX, US
Stephen Kerlegon - League City TX, US
Kien V. Phung - Pearland TX, US
Tatiana H. Sonnenberg - Houston TX, US
Cathy L. Tway - Shepherd MI, US
Hang Wang - Houston TX, US

Assignee:

CELANESE INTERNATIONAL CORPORATION - Dallas TX

International Classification:

C07C 67/04
C07C 67/54

US Classification:

560261

Abstract:

In one embodiment, the invention is to a process for producing a vinyl acetate composition by contacting a vinyl acetate stream with acetic acid, ethylene, and oxygen to form a reaction mixture and reacting the reaction mixture in a reactor under conditions effective to form a crude vinyl acetate composition comprising vinyl acetate, water, acetic acid and at least 0.1 wt % diacetoxyethylene.

US Patent:

60462728, Apr 4, 2000

Filed:

Jan 29, 1998

Appl. No.:

9/015560

Inventors:

Kien Van Phung - Allentown PA

Assignee:

Air Products and Chemicals, Inc. - Allentown PA

International Classification:

C08F 1606
C08F11606
C08F21606
C08G 6348
C08G 6391

US Classification:

525 56

Abstract:

A process for making a thermally stable and substantially low yellow polyvinyl alcohol, and a process for reversing discoloration of polyvinyl alcohol. The process consists of treating polyvinyl acetate before saponification or treating polyvinyl alcohol after saponification with a small amount of a reducing phosphorus-containing compound and, optionally, a trace amount of a peroxide. This invention is particularly useful in producing low molecular weight polyvinyl alcohol which is thermally stable and low in yellow color.

US Patent:

57537534, May 19, 1998

Filed:

Feb 19, 1997

Appl. No.:

8/803172

Inventors:

Kien Van Phung - Allentown PA
Dennis Sagl - Bethlehem PA

Assignee:

Air Products and Chemicals, Inc. - Allentown PA

International Classification:

C08F 1606

US Classification:

525 60

Abstract:

This invention relates to an improved process for producing a vinyl alcohol containing polymer having a narrow particle size without substantial reactor fouling. The process for producing the vinyl alcohol containing polymer involves hydrolyzing a vinyl ester containing polymer, e. g. , a polymer containing polymerized vinyl alkanoate units in the presence of an alcoholic medium and a hydrolysis catalyst in the presence of an alcoholic medium having finely divided, inert material such as an alkali metal carbonate dispersed therein. The finely divided inert material acts as nucleating sites for the polyvinyl alcohol as it precipitates from the solution during hydrolysis.

US Patent:

47286962, Mar 1, 1988

Filed:

Dec 2, 1985

Appl. No.:

6/803757

Inventors:

Kien Van Phung - Midland MI
Syamalarao Evani - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 2058

US Classification:

526304

Abstract:

The invention comprises a composition comprising at least one compound defined by the formula ##STR1## wherein R is hydrogen, C. sub. 1-4 alkyl or a group ##STR2## wherein G is a divalent hydrocarbyl-linking group and J, D, E and F are hereinafter defined; wherein J and E independently are divalent linking groups selected from ##STR3## wherein R' is hydrogen or C. sub. 1-4 alkyl; D is a divalent hydrocarbyl group which lends hydrophobicity to the compound; and F is a monovalent hydrocarbyl group which lends hydrophilicity to the compound. Such compositions are useful as comonomers with water-soluble monomers such as acrylamide and acrylic acid which form water-dispersible thickening agents which are resistant to shear degradation and heat and have a broad range of salt tolerance. Aqueous solutions thickened with such copolymers are useful in enhanced oil recovery processes as fluid mobility control agents, as fracturing fluids and drilling muds as well as hydraulic fluids and lubricants in many applications.