Patents by Inventor Robert D. Prottas

Robert D. Prottas 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).

  • Waterborne acrylourethane pigment dispersant polymer
    Patent number: 5051464
    Abstract: An improved waterbased coating composition containing about 10-50% by weight of film forming binder and pigment in a pigment to binder weight ratio of about 1/100 to 200/100 dispersed in an aqueous carrier and having a pH of about 7-10; wherein the improvement used in the composition is a acrylourethane pigment dispersing polymer in an amount of about 0.5-10% by weight, based on the weight of the coating composition; the acrylourethane pigment dispersing polymer is composed ofhydroxyl and carboxyl functional acrylic polyol having a hydroxyl no. of about 50-170 and an acid no. of about 30-120 and chain extended with an aliphatic, cycloaliphatic or aromatic diisocyanate in the presence of a monohydric alcohol and the polymer has a weight average molecular weight of about 10,000-40,000 and the carboxyl groups are neutralized with ammonia or an amine.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: September 24, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jeffery W. Johnson, Robert D. Prottas, Clifford H. Strolle