Patents Represented by Attorney L. J. Dankert

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  • Method of heat sealing employing a hot tack adhesive
    Patent number: 4253901
    Abstract: Normally solid heat-activatable thermoplastic adhesives having improved hot tack strength at heat-seal temperatures are composed essentially of copolymers of ethylene with acrylic acid or methacrylic acid having standard melt flow values from about 1 to about 3 dg/min., and are especially useful as heat-seal coating or layer on substrates for packaging.
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: March 3, 1981
    Assignee: The Dow Chemical Company
    Inventor: R. Corbin Aslakson
  • Transparent astatic resinous articles and method for their production
    Patent number: 3959561
    Abstract: A method for the rapid rendering of transparent polymer articles astatic by treating the articles with dilute gaseous sulfur trioxide followed by treatment with base such as ammonia and water or dilute aqueous ammonia. The articles are rendered permanently astatic without affecting their transparency by this process.
    Type: Grant
    Filed: June 28, 1971
    Date of Patent: May 25, 1976
    Assignee: The Dow Chemical Company
    Inventor: Wilhelm E. Walles