Nathan E Houser

US Patent:

6472494, Oct 29, 2002

Filed:

Feb 22, 2001

Appl. No.:

09/790422

Inventors:

Nathan E Houser - Afton VA
Gordon W Selling - Waynesboro VA

Assignee:

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

International Classification:

C08G 1876

US Classification:

528 61, 528 59, 528 64, 528 67, 528 76, 528906

Abstract:

A high heat-set efficiency, high unload power spandex, based on a polyurethaneurea prepared from a polyether glycol, mixtures of 2,4â-MDI and 4,4â-MDI, and chain extenders, is provided.

US Patent:

6720403, Apr 13, 2004

Filed:

Nov 1, 2002

Appl. No.:

10/286723

Inventors:

Nathan E. Houser - Afton VA

Assignee:

E.I. duPont de Nemours and Co. - Wilmington DE

International Classification:

C08G 1865

US Classification:

528 85, 528906

Abstract:

Spandex having good whiteness retention, high heat-set efficiency, and percent set is made from comprises amide soluble polyurethaneurea polymers prepared by reacting polyether which comprises the reaction product of a polymeric glycols with ortho-substituted diisocyanates and bulky diamine chain extenders.

US Patent:

6846866, Jan 25, 2005

Filed:

Jun 3, 2002

Appl. No.:

10/162360

Inventors:

Nathan E. Houser - Afton VA, US
Gordon W. Selling - Waynesboro VA, US

Assignee:

Invista North America S.a.r.L. - Wilmington DE

International Classification:

C08J 300
C08K 513
C08K 534
C08L 7500
D02G 300

US Classification:

524348, 428364, 428372, 428394, 428395, 524 86, 524101, 524108, 524115, 524127, 524140, 524141, 524145, 524151, 524152, 524283, 524287, 524290, 524291, 524299, 524323, 524324, 524330, 524333, 524334, 524335, 524336

Abstract:

The invention provides polyurethane containingThe polyurethane of the invention exhibits improved resistance to degradation by chlorine and by atmospheric fumes.

US Patent:

6916896, Jul 12, 2005

Filed:

May 5, 2003

Appl. No.:

10/430060

Inventors:

Gordon W. Selling - Dunlap IL, US
Nathan E. Houser - Afton VA, US

Assignee:

Invista North America S.a.r.l. - Wilmington DE

International Classification:

C08G018/76
C08G018/10
C08G018/32
C08G018/42
C08G018/48

US Classification:

528 49, 528 61, 528 67, 528 76, 528 80, 528 83, 528906

Abstract:

Commercially acceptable spandex can be prepared with greater efficiency, improved consistency and at lower costs from a high-solids content polyurethaneurea polymer solution. The polyurethaneurea is prepared using a combination of 4,4′-MDI and 2,4′-MDI, and an amount of chain extenders and chain terminators such that the polymer solution, prior to spinning, is highly soluble and has an appropriate pre-spun IV and primary amine content.

US Patent:

7838617, Nov 23, 2010

Filed:

Nov 3, 2004

Appl. No.:

10/904317

Inventors:

Nathan E. Houser - Afton VA, US
Gordon W. Selling - Dunlap IL, US
Beverly Jean Selle - Wilmington DE, US
Steven Peter Pardini - Waynesboro VA, US
Robert Dewhurst - Gloucester, GB
Elizabeth Todd Singewald - Wilmington DE, US

Assignee:

INVISTA North America s.àr.l. - Wilmington DE

International Classification:

C08G 18/76
C08G 18/10
C08G 18/32
C08G 18/42
C08G 18/48

US Classification:

528 49, 8543, 8926, 139420 A, 139420 R, 139421, 528 48, 528 61, 528 67, 528 76, 528 80, 528 83, 528906

Abstract:

Commercial spandex can be prepared with greater efficiency, improved consistency and at lower costs from a high-solids content polyurethaneurea polymer solution. The polyurethaneurea is prepared using a combination of 4,4′-MDI and 2,4′-MDI, and an amount of chain extenders and chain terminators such that the polymer solution, prior to spinning, is highly soluble and has an appropriate pre-spun IV and primary amine content. Such spandex fibers, and the fabrics and garments comprising them, have good dyeability and colorfastness, as well as other desirable characteristics.

US Patent:

53913434, Feb 21, 1995

Filed:

Oct 26, 1992

Appl. No.:

7/965600

Inventors:

Richard L. Dreibelbis - Waynesboro VA
Nathan E. Houser - Afton VA
Jacob Lahijani - Wilmington DE

Assignee:

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

International Classification:

B29D 700
B28B 138
C08J 320
C08L 7500

US Classification:

264216

Abstract:

Certain polyether-based or polyester-based polyurethaneureas in solutions of organic solvent at a 12 to 20% concentration are particularly suited for use in a mandrel-dipping process for producing thin-walled elastic articles, such as surgical gloves, which are more resistant to puncture and tear than conventional surgical gloves made from rubber latex.

US Patent:

57283400, Mar 17, 1998

Filed:

Jul 19, 1996

Appl. No.:

8/684067

Inventors:

Richard Lewis Dreibelbis - Waynesboro VA
Nathan Eli Houser - Afton VA
Jacob Lahijani - Wilmington DE

Assignee:

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

International Classification:

B29D 700
B28B 138
B28B 114
B28B 310

US Classification:

264216

Abstract:

Certain polyester-based polyurethaneureas in solutions of organic solvent at a 12 to 20% concentration are particularly suited for use in a mandrel-dipping process for producing thin-walled elastic articles, such as surgical gloves, which are more resistant to puncture and tear than conventional surgical gloves made from rubber latex.

US Patent:

53624327, Nov 8, 1994

Filed:

Apr 2, 1993

Appl. No.:

8/042342

Inventors:

Nathan E. Houser - Afton VA
Willem Bakker - Waynesboro VA
Richard L. Dreibelbis - Waynesboro VA

Assignee:

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

International Classification:

D01D 504
D01F 678

US Classification:

264205

Abstract:

A process is provided for dry spinning a segmented polyurethaneurea at speeds as high as 900 meters/min. The process includes chain-extending an isocyanate-capped polyether glycol with a mixture of ethylenediamine and 1,2-diaminopropane, the 1,2-diaminopropane amounting to 8 to 17 mole % of the diamine mixture. The resultant spandex is particularly suited for use in women's hosiery.