Patents by Inventor Robert S. Wallach

Robert S. Wallach 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).

  • Fast setting polyurethane hot melt adhesive composition comprising low hydroxyl number/high molecular weight polyester diols
    Patent number: 5939488
    Abstract: The subject invention provides reactive hot melt adhesive compositions comprising polyurethane prepolymers which have an isocyanate index greater than one and which are prepared from a low hydroxyl number composition comprising high molecular weight polyester diols which have a relatively low melting point. These reactive hot melt adhesive compositions have a faster setting speed than conventional reactive hot melt adhesive compositions. The subject invention also provides a method for bonding articles together which uses such reactive hot melt adhesive compositions and articles which comprise the reactive hot melt adhesive compositions.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: August 17, 1999
    Assignee: National Starch and Chemical Investment Holding Corporation
    Inventors: James W. Nowicki, Robert S. Wallach