Patents by Inventor Thord G. Hassler

Thord G. Hassler 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).

  • Paper size and paper sizing process
    Patent number: 6159339
    Abstract: Disclosed are a paper size consisting essentially of a) alkyl ketene dimer and/or alkenyl succinic acid anhydride; b) degraded, liquid cationic starch having a cationic charge density of 0.5 to 3.5 meqv/g, a degree of substitution of more than 0.1 and a viscosity of less than 10000 cps (30% by weight solution in water at 25.degree. C.); and c) water, and a process for making paper products in which this paper size is added to the pulp. The invention allows the production of AKD and/or ASA sizes on-site in paper plants using simple mixing equipment.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: December 12, 2000
    Assignee: BetzDearborn Inc.
    Inventors: Thord G. Hassler, Jurgen F. Schuetz, Bryan C. Smith
  • Water soluble thermosetting resin, process for its production, paper sizing composition and paper sizing process
    Patent number: 4895621
    Abstract: A water soluble thermosetting resin useful as a promoter for paper sizing is described. Polyallylamine or a modified polyallyamine is reacted with epichlorohydrin and/or formaldehyde. The formaldehyde may be reacted with the polyallylamine in the presence of dicyandiamide, urea or an ammonium salt or mixtures thereof.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: January 23, 1990
    Assignee: W. R. Grace AB
    Inventor: Thord G. Hassler