Patents by Inventor Clayton W. Hoornstra

Clayton W. Hoornstra 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).

  • Gelled photopolymer composition for article in relief
    Patent number: 4124389
    Abstract: A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: November 7, 1978
    Assignee: The Dow Chemical Company
    Inventors: Clayton W. Hoornstra, Violete L. Stevens
  • Fused poly-nuclear aromatic cyclic sulfonium zwitterions and polymers thereof
    Patent number: 4118297
    Abstract: AR-Cyclic sulfonium, fused polynuclear areneoxides exemplified by the structural formula: ##STR1## polymerize readily upon exposure to ultraviolet light and/or heat to yield water-insoluble resins useful as adhesives, coatings, films and the like. Fused polynuclear zwitterions containing more than one areneoxide and cyclic sulfonium group per molecule crosslink under such conditions.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: October 3, 1978
    Assignee: The Dow Chemical Company
    Inventors: William E. Broxterman, Demetrius Urchick, Donald L. Schmidt, Clayton W. Hoornstra
  • Gelled photopolymer composition and methods of making them
    Patent number: 4072529
    Abstract: A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or a mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: February 7, 1978
    Assignee: The Dow Chemical Company
    Inventors: Clayton W. Hoornstra, Violete L. Stevens