Ram Avtar Gupta

US Patent:

52888657, Feb 22, 1994

Filed:

Oct 30, 1992

Appl. No.:

7/968871

Inventors:

Ram B. Gupta - Bronx NY

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07D25154
C07D41304

US Classification:

544200

Abstract:

This invention provides a process for preparing amide derivatives of acids by the reaction of haloaminotriazines and acid halides. This invention also provides a process for preparing isocyanates and isocyanate adducts from amide derivatives derived from haloaminotriazines and acid halides such as oxalyl chloride, phosgene and phosgene analogs. Melamine derived acid amides are prepared by reaction of trichloro and hexachloromelamines with chloroformates and acid chlorides. The by-product chlorine may be recycled in this process. Amides, carbamates, sulfonamides, phosphoramides, and related amide derivatives may be prepared by the novel processes of the invention.

US Patent:

58521330, Dec 22, 1998

Filed:

Aug 29, 1996

Appl. No.:

8/705472

Inventors:

Ram Baboo Gupta - Bronx NY
Kuang Jong Wu - Easton CT

Assignee:

Cytec Technology Corp. - Wilmington DE

International Classification:

C08F 832

US Classification:

525375

Abstract:

Curable compositions which include a 1,3,5-triazine carbamate crosslinker and a polyfunctional epoxy resin as well as their uses in coatings are disclosed. The compositions may additionally contain a co-crosslinker and/or a polyfunctional hydroxy group containing material. Reduction in the formaldehyde emission levels relative to aminoplast resin based coatings can be achieved without loss of the ultimate film properties.

US Patent:

55719155, Nov 5, 1996

Filed:

Mar 3, 1995

Appl. No.:

8/398256

Inventors:

Ram B. Gupta - Bronx NY

Assignee:

Cytec Technology Corp. - Wilmington DE

International Classification:

C07D25148
C07D25154

US Classification:

544200

Abstract:

This invention provides a process for preparing amide derivatives of acids by the reaction of haloaminotriazines and acid halides. This invention also provides a process for preparing isocyanates and isocyanate adducts from amide derivatives derived from haloaminotriazines and acid halides such as oxalyl chloride, phosgene and phosgene analogs. Melamine derived acid amides are prepared by reaction of trichloro and hexachloromelamines with chloroformates and acid chlorides. The by-product chlorine may be recycled in this process. Amides, carbamates, sulfonamides, phosphoramides, and related amide derivatives may be prepared by the novel processes of the invention.

US Patent:

54059593, Apr 11, 1995

Filed:

Nov 10, 1993

Appl. No.:

8/150679

Inventors:

Ram B. Gupta - Bronx NY

Assignee:

Cytec Technology Corp. - Wilmington DE

International Classification:

C07D25148
C07D25154

US Classification:

544195

Abstract:

This invention provides a process for preparing amide derivatives of acids by the reaction of haloaminotriazines and acid halides. This invention also provides a process for preparing isocyanates and isocyanate adducts from amide derivatives derived from haloaminotriazines and acid halides such as oxalyl chloride, phosgene and phosgene analogs. Melamine derived acid amides are prepared by reaction of trichloro and hexachloromelamines with chloroformates and acid chlorides. The by-product chlorine may be recycled in this process. Amides, carbamates, sulfonamides, phosphoramides, and related amide derivatives may be prepared by the novel processes of the invention.

US Patent:

61536725, Nov 28, 2000

Filed:

Jan 7, 1993

Appl. No.:

8/001697

Inventors:

Ram B. Gupta - Bronx NY
Robert G. Lees - South Stamford CT

Assignee:

Cytec Technology Corp. - Wilmington DE

International Classification:

C07D40314
C08G 7306
C08L 3314
C08L 6702

US Classification:

523414

Abstract:

A process for preparing a tris-lactam crosslinking agent, tris-pyrrolidonyl triazine, from N,N',N"-tris(4-chlorobutyryl)melamine by treatment of the chlorobutyryl derivative with a base such as sodium or potassium carbonate to effect intramolecular cyclization to the tris-lactam. A curable composition comprised of tris-pyrrolidonyl triazine as the crosslinking agent and a hydroxyfunctional or aminofunctional material as a resin. Thick films with no pinholes are prepared from the curable compositions using powder coating techniques.