Patents by Inventor Donald N. Van Eenam

Donald N. Van Eenam 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).

  • Purification of wet strength resins
    Patent number: 4269951
    Abstract: Certain wet strength resins based on the epichlorohydrin/polyamine reaction which are characterized by extremely long gel times can be purified from epichlorohydrin residuals by azeotropic distillation.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: May 26, 1981
    Assignee: Monsanto Company
    Inventor: Donald N. Van Eenam
  • Wet strength paper additives
    Patent number: 4250212
    Abstract: A polymer is described which has particular utility as an additive imparting wet an dry strength to a paper base. The polymer is formed by the reaction of a polymer of an N,N-disubstituted vinyl-benzyl amine or homologue thereof with an epihalohydrin.
    Type: Grant
    Filed: January 7, 1980
    Date of Patent: February 10, 1981
    Assignee: Monsanto Company
    Inventor: Donald N. Van Eenam
  • Wet strength polymers
    Patent number: 4233417
    Abstract: The invention provides a stable polymeric additive useful for improving the wet strength of a cellulosic substrate. The additive is a water-soluble cationic thermosetting polymer incorporating a plurality of extralinear glycidyl quaternary ammonium groups. The invention also comprises a method of making such an additive.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: November 11, 1980
    Assignee: Monsanto Company
    Inventor: Donald N. Van Eenam
  • Wet strength paper additives
    Patent number: 4226957
    Abstract: A polymer is described which has particular utility as an additive imparting wet and dry strength to a paper base. The polymer is formed by the reaction of a polymer of an N,N-disubstituted vinyl-benzyl amine or homologue thereof with an epihalohydrin.
    Type: Grant
    Filed: June 13, 1979
    Date of Patent: October 7, 1980
    Assignee: Monsanto Company
    Inventor: Donald N. Van Eenam
  • Polyamine/epihalohydrin reaction products
    Patent number: 4222921
    Abstract: An improved wet strength resin prepared from a polyamine and an epihalohydrin is obtained with improved yield if the polyamine is formed by the polymerization of a quaternary amine in the presence of an anion derived from an acid in which the final pKa is less than 2.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: September 16, 1980
    Assignee: Monsanto Company
    Inventor: Donald N. Van Eenam
  • Air drying process
    Patent number: 4145248
    Abstract: Polymers comprising a plurality of adjacent activated unsaturations and which are hydrophilic are particularly useful as wet and dry strength improvers for cellulosic substrates.
    Type: Grant
    Filed: October 13, 1977
    Date of Patent: March 20, 1979
    Assignee: Monsanto Company
    Inventor: Donald N. Van Eenam
  • Polyamine-epihalohydrin resinous reaction products
    Patent number: 4129528
    Abstract: Resinous reaction products wherein the hydrohalide salt of a polyamine is condensed with an epihalohydrin provides improved wet strength and improved dry strength to cellulosic substrates such as paper, paperboard, and the like. It has been found that the wet strength and dry strength of paper products can be significantly improved by using a resinous reaction product resulting from the removal of halide ions from the polyamine hydrohalide salt before it is condensed with an epihalohydrin.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: December 12, 1978
    Assignee: Monsanto Company
    Inventors: John P. Petrovich, Donald N. Van Eenam