Balwant Singh

US Patent:

6630599, Oct 7, 2003

Filed:

Dec 30, 1998

Appl. No.:

09/223512

Inventors:

Balwant Singh - Stamford CT
Laurence Wu-Kwang Chang - Orange CT

Assignee:

Cytec Technology Corp. - Wilmington DE

International Classification:

C07C26100

US Classification:

560 25, 5483211, 548537

Abstract:

A process for preparing blocked derivatives of m- or p- isopropenyl-,-dimethylbenzyl isocyanates, comprising reacting a meta- or a para-isopropenyl-,-dimethylbenzyl carbamate ester with hydroxy functional blocking group, such as hydroxyethylene-ethyleneurea, hydroxyethylenepropylene urea, dialkylaminoethanol and dialkylamino propanol.

US Patent:

53149505, May 24, 1994

Filed:

Jan 22, 1993

Appl. No.:

8/007225

Inventors:

Balwant Singh - Stamford CT
Robert J. Tynik - Stamford CT

Assignee:

Cytec Technology Corp. - Wilmington DE

International Classification:

C08L 3500
C08L 3506
C08F22240
C08F12240

US Classification:

525 73

Abstract:

Novel resin compositions are provided which possess excellent heat resistance and thermal color stability, alone, or in admixture with bulk resins. The claimed resin compositions comprise homo- and/or copolymers of N-(2,3-dimethylphenyl) maleimide, alone, or in further combination with resins composed of copolymer components, such as vinyl copolymers and rubber-grafted vinyl copolymer resins. The resin compositions have improved heat resistance and produce molded articles with desirably light colors. Also provided is an improved process to make maleimide monomers by using selected polar solvents whereby the amount of uncyclizable trans-amic acid is held at tolerable levels and the desired maleimide is obtained in high yields, free from by-products.

US Patent:

50895613, Feb 18, 1992

Filed:

Mar 11, 1991

Appl. No.:

7/667740

Inventors:

Peter S. Forgione - Stamford CT
Balwant Singh - Stamford CT

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C08F 830

US Classification:

525127

Abstract:

Novel alkylcarbamylmethyl aminotriazines self-cure and also function as crosslinkers for compounds containing active hydrogen groups. When the active hydrogen-containing compounds are hydroxylated polymers, coatings are provided with exceptional resistance to detergent and salt-spray exposure and improved abrasion resistance. The novel aminotriazines also can be combined with fillers as binders which when cured provide shaped articles of manufacture, such as insulation and foundry core molds.

US Patent:

39446182, Mar 16, 1976

Filed:

Aug 1, 1974

Appl. No.:

5/493802

Inventors:

Balwant Singh - Stamford CT

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07C 8900
C07C 8904
C07C 9104

US Classification:

260584R

Abstract:

D-2-Amino-1-butanol, for the synthesis of ethambutol hydrochloride, d,d'-2,2'-(ethylenediimino)di-1-butanol dihydrochloride, is produced in high purity and good yields by the reaction of butene-1, a nitrile, preferably an excess of acetonitrile, and chlorine to form N-[1-(chloromethyl)propyl]acetimidoyl chloride which is hydrolyzed to dl-2-amino-1-butanol, which can be isolated as the hydrochloride, or free base, or a mixture, resolved with L(+)-tartaric acid and the d-2-amino-1-butanol reacted with ethylene dichloride and then hydrochloric acid to form ethambutol hydrochloride. A minimum of by-products which are conveniently split out permits the economical synthesis of a pharmaceutical grade product.

US Patent:

50896172, Feb 18, 1992

Filed:

Nov 13, 1987

Appl. No.:

7/120570

Inventors:

Peter S. Forgione - Stamford CT
Balwant Singh - Stamford CT

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07D25118
C07D25170

US Classification:

544196

Abstract:

Novel beta-hydroxyalkylcarbamylmethyl aminotriazines function in self-condensation and as cross-linkers for amino resins and also compounds containing active hydrogen groups. The compositions cure to coatings with excellent properties, and they can be used as binders for fillers such as insulating glass and foundry sand.

US Patent:

43747710, Feb 22, 1983

Filed:

Mar 8, 1982

Appl. No.:

6/355821

Inventors:

Balwant Singh - Stamford CT
Robert W. Novak - Stamford CT

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07D40312

US Classification:

2602393R

Abstract:

The novel compound, N,N'-methylenebis (hexahydro-2-oxo-1H-azepine-1-carboxamide) which is useful as a blocked isocyanate to introduce the functionality of methylene diisocyanate and which is prepared by the reaction of isocyanic acid and caprolactam followed by reaction with formaldehyde.

US Patent:

43953697, Jul 26, 1983

Filed:

Mar 8, 1982

Appl. No.:

6/355945

Inventors:

William A. Henderson - Stamford CT
Balwant Singh - Stamford CT

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07C11800

US Classification:

260453P

Abstract:

A process for production of tertiary aralkyl isocyanates by reaction at low temperatures of the corresponding halides with an excess of isocyanic acid. Manufacture of TMXDI is specifically contemplated.

US Patent:

46330100, Dec 30, 1986

Filed:

Dec 27, 1982

Appl. No.:

6/453681

Inventors:

Balwant Singh - Stamford CT
Peter S. Forgione - Stamford CT

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07C125077
C07C119048

US Classification:

560 25

Abstract:

1,3,5-Tris(1-isocyanatomethylethyl)benzene is disclosed as a component in coating formulations and the like.