Phan L Tang from 133 Side Saddle Pl, West Chester, PA 19382, age 63, Phone: 610 455-0951

Us Patents

Curable Base-Resistant Fluoroelastomers
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US Patent:

6664339, Dec 16, 2003
Filed:

May 2, 2002
Appl. No.:

10/138069
Inventors:

Walter Werner Schmiegel - Wilmington DE
Phan Linh Tang - West Chester PA
Assignee:

DuPont Dow Elastomers LLC - Wilmington DE
International Classification:

C08L 2712
US Classification:

5253264, 5253263, 5253593, 525368, 525384
Abstract:

A base resistant, substantially amorphous fluoroelastomer comprising (1) 10-40 mole percent ethylene units, (2) 32-60 mole percent tetrafluoroethylene units, (3) 20-40 mole percent perfluoro ether units selected from the group consisting of perfluoro(alkyl vinyl ethers), perfluoro(alkyl alkenyl ethers) and perfluoro(alkoxy alkenyl ethers), and (4) 0. 1 to 15 mole percent of a cure site monomer selected from the group consisting of i) 3,3,3-trifluoropropene-1, ii) trifluoroethylene, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene. Such fluoroelastomers may be vulcanized with polyhydroxy curatives. The resulting vulcanized fluoroelastomer compositions are resistant to attack by amines, strong bases and hydrogen sulfide and possess a combination of good low temperature and high temperature properties and they are resistant to oil swell.

Process For Producing Fluoroelastomers With Fluorinated Anionic Surfactants
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US Patent:

6774164, Aug 10, 2004
Filed:

Aug 24, 2001
Appl. No.:

09/938695
Inventors:

Donald Frederick Lyons - Wilmington DE
Albert Lloyd Moore - Wilmington DE
Phan Linh Tang - West Chester PA
Assignee:

DuPont Dow Elastomers L.L.C. - Wilmington DE
International Classification:

C08F21418
US Classification:

524157, 524166, 524423, 524462, 524544, 524545, 524546, 524805, 5253262, 525344, 526225, 526242, 526250, 526255
Abstract:

A novel emulsion polymerization process for the production of fluoroelastomers is disclosed wherein a partially fluorinated anionic surfactant of the formula Fâ(CF CF ) âCH CH SO M, where n is an integer from 2 to 9, or mixtures thereof, and M is a cation having a valence of 1, is used as the dispersing agent.

Curable Base-Resistant Fluoroelastomers
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US Patent:

6887959, May 3, 2005
Filed:

Sep 24, 2003
Appl. No.:

10/670086
Inventors:

Walter Werner Schmiegel - Wilmington DE, US
Phan Linh Tang - West Chester PA, US
Assignee:

DuPont Dow Elastomers LLC - Wilmington DE
International Classification:

C08F130/02
US Classification:

526247, 5253263, 5253264
Abstract:

A base resistant, substantially amorphous fluoroelastomer comprising (1) 10-40 mole percent ethylene units, (2) 32-60 mole percent tetrafluoroethylene units, (3) 20-40 mole percent perfluoro ether units selected from the group consisting of perfluoro(alkyl vinyl ethers), perfluoro(alkyl alkenyl ethers) and perfluoro(alkoxy alkenyl ethers), and (4) 0. 1 to 15 mole percent of a cure site monomer selected from the group consisting of i) 3,3,3-trifluoropropene-1, ii) trifluoroethylene, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene. Such fluoroelastomers may be vulcanized with polyhydroxy curatives. The resulting vulcanized fluoroelastomer compositions are resistant to attack by amines, strong bases and hydrogen sulfide and possess a combination of good low temperature and high temperature properties and they are resistant to oil swell.

Semi-Batch Process For Producing Fluoroelastomers
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US Patent:

7521513, Apr 21, 2009
Filed:

Oct 23, 2007
Appl. No.:

11/977021
Inventors:

Phan Linh Tang - West Chester PA, US
Assignee:

DuPont Performance Elastomers LLC - Wilmington DE
International Classification:

C08F 4/00
C08F 14/18
C08F 114/18
C08F 12/20
C08F 214/18
C08F 10/24
C08F 116/12
C08F 216/12
US Classification:

526247, 526 91, 526242, 526250, 526255
Abstract:

A novel semi-batch emulsion polymerization process for the production of fluoroelastomers is disclosed wherein a hydrocarbon anionic surfactant is employed as the dispersing agent. The surfactant has the formula R-L-M wherein R is an alkyl group having between 6 and 17 carbon atoms, L is selected from the group consisting of ArSO, SO, SO, PO and COO and M is a univalent cation. Preferred surfactants are sulfonates of the formula CH—(CH)—SOM, CH—(CH)—CH—SOM, or CH—(CH)—CH═CHCH—SOM, where n is an integer from 6 to 17, or mixtures thereof, and M is a cation having a valence of 1. Surfactant is not introduced to the reactor until shortly after the polymerization reaction has begun.

Curable Base-Resistant Fluoroelastomers
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US Patent:

7576164, Aug 18, 2009
Filed:

Feb 27, 2007
Appl. No.:

11/712250
Inventors:

John G. Bauerle - Wilmington DE, US
Christopher J. Bish - Kennett Square PA, US
Theresa M. Dobel - Akron OH, US
Phan L. Tang - West Chester PA, US
Assignee:

Du Pont Performance Elastomers LLC. - Wilmington DE
International Classification:

C08F 12/20
C08F 114/18
US Classification:

526242, 524544, 524545, 524546, 524547, 524551, 524570, 524800, 526247, 526249, 526250, 526253, 526255, 526291, 5262929, 526294, 526296, 526332, 5263488, 526348
Abstract:

Compositions of fluoroelastomers containing copolymerized units of tetrafluoroethylene, propylene, a first cure site selected from the group consisting of i) trifluoroethylene, ii) 3,3,3-trifluoropropene-1, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene, and a second cure site selected from the group consisting of i) copolymerized units of a brominated cure site monomer, ii) copolymerized units of an iodinated cure site monomer, iii) copolymerized units of a chlorinated cure site monomer, iv) brominated endgroups, v) iodinated endgroups and vi) a combination of any of i)-v) are readily curable with polyhydroxy curing systems. The resulting cured articles have a combination of excellent resistance to alkaline fluids, superior tensile properties and compression set resistance, and excellent adhesion to metal substrates. Optionally, the fluoroelastomers may be dual cured by both a polyhydroxy system and an organic peroxide system.

Process For Producing Fluoropolymers
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US Patent:

7754810, Jul 13, 2010
Filed:

Oct 21, 2008
Appl. No.:

12/255082
Inventors:

Michael Cregg Coughlin - Wilmington DE, US
Ming-Hong Hung - Wilmington DE, US
Phan Linh Tang - West Chester PA, US
International Classification:

C08K 5/01
US Classification:

524746, 524805
Abstract:

An emulsion polymerization process for the production of fluoropolymers is disclosed wherein a combination of at least two fluorosurfactants is employed as dispersants. At least one fluorosurfactant is a perfluoroalkyl or perfluoroalkoxy sulfinate. At least one other fluorosurfactant is a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a slat thereof, sulfonic acid and a salt thereof.

Fluoroalkyl Ether Sulfonate Surfactants
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US Patent:

7977426, Jul 12, 2011
Filed:

Nov 13, 2008
Appl. No.:

12/270120
Inventors:

Sheng Peng - Hockessin DE, US
Ming-Hong Hung - Wilmington DE, US
Christopher P. Junk - Wilmington DE, US
Phan Linh Tang - West Chester PA, US
Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE
International Classification:

C08K 3/06
US Classification:

524742
Abstract:

A compound of Formula (1)R—O—(CXX′)—(CY)SOM (1)wherein.

Fluorosulfonates
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US Patent:

7989568, Aug 2, 2011
Filed:

Nov 13, 2008
Appl. No.:

12/270148
Inventors:

Sheng Peng - Hockessin DE, US
Phan Linh Tang - West Chester PA, US
Assignee:

E.I. du Pont de Nemours and Company - Wilmington DE
International Classification:

C08F 14/18
US Classification:

526225, 524805
Abstract:

A process comprising polymerizing in an aqueous medium at least one fluorinated olefin monomer other than vinylidene fluoride in the presence of a compound of formula (1):R(CHCF)—(CH)SOM (1)wherein.