Clay M Jones

US Patent:

6720437, Apr 13, 2004

Filed:

Jan 30, 2002

Appl. No.:

10/060995

Inventors:

Clay Woodward Jones - Washington WV
Ta-Wei Fu - Vienna WV

Assignee:

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

International Classification:

C11B 310

US Classification:

554191, 554207

Abstract:

Fluorinated carboxylic acid, used as a surfactant in fluoropolymerization in aqueous media, can be recovered by scrubbing from the exhaust gas of the dryer during polymer drying and, after concentration and treatment with alumina, directly reused in fluoropolymerization in aqueous media.

US Patent:

6841594, Jan 11, 2005

Filed:

Mar 13, 2002

Appl. No.:

10/098803

Inventors:

Clay Woodward Jones - Washington WV, US
Walter Thomas Krakowiak - Wilmington DE, US

Assignee:

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

International Classification:

C08L 8300
C08L 2712

US Classification:

523201, 524546

Abstract:

A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2. 225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1. 5×10Pas and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9×10Pas and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.

US Patent:

7347960, Mar 25, 2008

Filed:

Nov 3, 2004

Appl. No.:

10/980701

Inventors:

Clay Woodward Jones - Washington WV, US

Assignee:

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

International Classification:

D01F 6/12

US Classification:

264127, 428421, 523201, 524500

Abstract:

A process is disclosed for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible fluoropolymer particles and an aqueous solution of a matrix polymer is formed. The non-melt-processible fluoropolymer particles have an SSG of less than about 2. 40 and comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce the non-melt-processible fluoropolymer particles to form the fiber. The present invention also provides for spinning composition useful for the dispersion spinning of non-melt-processible fluoropolymer fiber.

US Patent:

7390448, Jun 24, 2008

Filed:

Jul 28, 2006

Appl. No.:

11/494893

Inventors:

Devin Flowers - Kennett Square PA, US
Clay Woodward Jones - Washington WV, US
Robert John Cavanaugh - Cincinnati OH, US

Assignee:

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

International Classification:

D01F 6/12

US Classification:

264127, 524500, 525191, 428421

Abstract:

A process for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible polytetrafluoroethylene or modified polytetrafluoroethylene fluoropolymer particles and an aqueous solution of matrix polymer is formed. The non melt-processible particles have an SSG of less than about 2. 40. The aqueous dispersion contains an aliphatic alcohol ethoxylate nonionic surfactant having a 20% residuals temperature determined by thermogravimetric analysis (TGA) of less than about 290 C. and is essentially free of surfactants containing aromatic groups. The dispersion has a fluorinated surfactant content of less than about 300 ppm. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce. The present invention also provides a spinning composition useful for the dispersion spinning of non-melt-processible fluoropolymer fiber.

US Patent:

7612139, Nov 3, 2009

Filed:

May 15, 2006

Appl. No.:

11/435006

Inventors:

Clay Woodward Jones - Washington WV, US
David William Johnson - Washington WV, US

Assignee:

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

International Classification:

C08L 27/12

US Classification:

524544, 523310, 524458, 524546, 525482

Abstract:

A stabilized aqueous fluoropolymer dispersion comprising:.

US Patent:

7619039, Nov 17, 2009

Filed:

Apr 19, 2006

Appl. No.:

11/407166

Inventors:

Clay Woodward Jones - Washington WV, US
Robert John Cavanaugh - Cincinnati OH, US
Walter Thomas Krakowiak - Wilmington DE, US
Richard A. Morgan - Vienna WV, US
Theodore A. Treat - Washington WV, US

Assignee:

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

International Classification:

C08F 259/00
C08F 259/10
C08L 43/00

US Classification:

525276, 524535, 526242

Abstract:

An aqueous dispersion of non-melt-processible fluoropolymer, process for making same and concentrated dispersion and powder obtained from the dispersion. The fluoropolymer particles of the dispersion have a standard specific gravity (SSG) of less than 2. 225 and comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. At least about 1. 5 weight % of the fluoropolymer particles comprise substantially rod-shaped particles having a length to diameter ratio greater than about 5.

US Patent:

7790041, Sep 7, 2010

Filed:

Aug 1, 2005

Appl. No.:

11/194257

Inventors:

Charles Joseph Noelke - Wilmington DE, US
Clay Woodward Jones - Washington WV, US
Michael Gene McClusky - Washington WV, US
David William Johnson - Washington WV, US

Assignee:

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

International Classification:

B01D 15/04

US Classification:

210690, 523310, 524544, 526242, 526250

Abstract:

A process for reducing the fluorosurfactant content of an aqueous fluoropolymer dispersion by filling a shipping container with fluoropolymer dispersion and contacting the dispersion with a fluorosurfactant sorbent in the shipping container.

US Patent:

7956112, Jun 7, 2011

Filed:

Oct 23, 2007

Appl. No.:

11/876944

Inventors:

Clay Woodward Jones - Washington WV, US

Assignee:

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

International Classification:

C08F 6/22
C08L 27/18

US Classification:

524236, 528401, 524612, 524546, 526206, 526255

Abstract:

An aqueous fluoropolymer dispersion comprising an aqueous medium, fluoropolymer particles, and an amine oxide surfactant. Coagulated fluoropolymer resin is produced from the dispersion by adding an acidic reagent in sufficient amount to cause coagulation and separation of the coagulated fluoropolymer resin from the aqueous medium. Another particulate component such as particular polymer, filler, pigment, solid lubricant, etc. , may be added to the dispersion and co-coagulated to form a mixture of coagulated fluoropolymer resin and particulate component.