Patents by Inventor Roy R. Wilkinson

Roy R. Wilkinson 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).

  • Antipopping agents for powder coating compositions
    Patent number: 5342893
    Abstract: A thermosetting powder coating composition containing a solid saturated thermosetting polyester having an acid value of at least 25 and a glass transition temperature (Tg) of at least 45.degree. C. and a curing agent such as a hydroxyalkyl amide capable of reacting with carboxylic acid groups of the polyester additionally contains, as an anti-popping agent, a thermoplastic polymer which i) is solid, ii) has a Tg of 30.degree.-100.degree. C., iii) comprises, at least mainly, units derived from at least one alkyl acrylate or alkacrylate and iv) has an acid value of no more than 10.
    Type: Grant
    Filed: March 10, 1993
    Date of Patent: August 30, 1994
    Assignee: Scott Bader Company Limited
    Inventors: Roy R. Wilkinson, Anthony Phillips