Patents by Inventor Laurence Wu-Kwang Chang

Laurence Wu-Kwang Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for preparing derivatives of isopropenyl-&agr;, &agr;-dimethylbenzyl isocyanate
    Patent number: 6630599
    Abstract: A process for preparing blocked derivatives of m- or p- isopropenyl-&agr;,&agr;-dimethylbenzyl isocyanates, comprising reacting a meta- or a para-isopropenyl-&agr;,&agr;-dimethylbenzyl carbamate ester with hydroxy functional blocking group, such as hydroxyethylene-ethyleneurea, hydroxyethylenepropylene urea, dialkylaminoethanol and dialkylamino propanol
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: October 7, 2003
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, Laurence Wu-Kwang Chang
  • Self-crosslinking hydroxy/alkoxy acyl imidazolidinone monomers
    Patent number: 6307058
    Abstract: Acyl imidazolidinones and compositions containing the same are disclosed, which are particularly suitable for use as self-crosslinkers and can also be used as wet adhesion properties, especially in latex-based polymer systems. Processes for preparing such compounds, compositions containing the same, as well as additional uses thereof are also disclosed.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: October 23, 2001
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, David Andrew Siesel, Laurence Wu-Kwang Chang
  • Ethylenically unsaturated imidazidolidinone monomers
    Patent number: 6166220
    Abstract: Classes of urea functional compounds and compositions containing the same are disclosed which are particularly suitable for use as a wet adhesion promoters in coatings, especially in aqueous emulsion systems used to make latex paints. Compositions containing the same, as well as additional uses thereof are also disclosed.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: December 26, 2000
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, Roland Ralph DiLeone, Laurence Wu-Kwang Chang
  • Curable compositions containing novel polyfunctional crosslinking agents
    Patent number: 6150460
    Abstract: Novel polyfunctional glyoxylated compounds and compositions containing the same are disclosed which are particularly suitable for use as crosslinking components in curable compositions and also find use in imparting wet adhesion properties to water-based paints and coatings. A process for preparing novel polyfunctional glyoxylated compounds is also disclosed.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: November 21, 2000
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, Laurence Wu-Kwang Chang
  • Method of coating a substrate using curable compositions containing novel polyfunctional crosslinking agents
    Patent number: 6136378
    Abstract: Novel polyfunctional glyoxylated compounds and compositions containing the same are disclosed which are particularly suitable for use as crosslinking components in curable compositions and also find use in imparting wet adhesion properties to water-based paints and coatings. A process for preparing novel polyfunctional glyoxylated compounds is also disclosed.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: October 24, 2000
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, Laurence Wu-Kwang Chang
  • Polyfunctional crosslinking agents and curable compositions containing the same
    Patent number: 6028141
    Abstract: Novel polyfunctonal glyoxylated compounds and compositions containing the same are disclosed which are particularly suitable for use as crosslinking components in curable compositions and also find use in imparting wet adhesion properties to water-based paints and coatings. A process for preparing novel polyfunctional glyoxylated compounds is also disclosed.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: February 22, 2000
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, Laurence Wu-Kwang Chang
  • Sulfenamide accelerators and rubber compositions containing the same
    Patent number: 5840908
    Abstract: Novel mono- and bis-benzothiazole sulfenamide compounds based on primary amines are provided which may be employed as rubber vulcanization accelerators having excellent scorch safety. Vulcanizable rubber compositions containing rubber, sulfur and the novel benzothiazole sulfenamide compounds are also provided.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: November 24, 1998
    Assignee: Cytec Technology Corp.
    Inventors: Balwant Singh, Thomas Patrick Sassi, Laurence Wu-Kwang Chang
  • Surface-modified polyacrylonitrile substrates
    Patent number: 5194512
    Abstract: A composition is disclosed herein which comprises a core of a polyacrylonitrile homopolymer or copolymer and a surface of N-haloamides. Also disclosed is a process for the production of said composition.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: March 16, 1993
    Assignee: American Cyanamid Company
    Inventors: Laurence Wu-Kwang Chang, Larry S. Anderson, David A. Ley