Patents by Inventor Walter M. W. Zom

Walter M. W. Zom 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 aqueous dispersions of acrylic-urethane graft copolymers
    Patent number: 4730021
    Abstract: Ethylenically unsaturated aqueous urethane dispersions of controlled molecular weight are prepared by first reacting an active hydrogen atom containing polymerizable vinyl compound with a diisocyanate to produce a monoacrylated diisocyanate adduct in the presence of excess diisocyanate.The adduct thus formed, being a nearly selectively made mono-ethylenically unsaturated mono-isocyanate compound, is used in preparing an aqueous urethane polymer dispersion by reacting this adduct with polyisocyanates, organic compounds containing active hydrogen atoms like polyols and polyamines and organic compounds containing at least one active hydrogen atom and at least one group capable of saltformation, followed by neutralizing, dispersing in water and chain-extending the prepolymer.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: March 8, 1988
    Assignee: Polyvinyl Chemie Holland B.V.
    Inventors: Walter M. W. Zom, Hendricus C. Goos, Johan Stijntjes