Patents by Inventor David W. Swatton

David W. Swatton 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).

  • Process for preparing photohardenable elastomeric element having increased exposure latitude
    Patent number: 5582954
    Abstract: A process for preparing a photohardenable elastomeric element having increased exposure latitude, said element having a support and a photohardenable layer wherein at least (a) a thermoplastic-elastomeric polymeric binder comprising a copolymer of isoprene, (b) a liquid plasticizer, and (c) a petroleum wax, are premixed is described.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: December 10, 1996
    Assignee: E.I. Du Pont de Nemours and Company
    Inventors: David W. Swatton, Bernard Feinberg, Udo Weikart
  • Photosensitive elastomeric element having improved solvent resistance
    Patent number: 5135837
    Abstract: A photosensitive elastomeric composition and process of using the composition to prepare flexographic printing plates having substantially improved solvent resistance are described.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: August 4, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: David W. Swatton
  • Plasticized polyvinyl alcohol release layer for a flexographic printing plate
    Patent number: 5077175
    Abstract: The present invention concerns a plasticized polyvinyl alcohol release composition for an aqueous or semi-aqueous processible flexographic printing plate comprising:(a) at least 60% of a substantially hydrolyzed polyvinyl alcohol based on the total weight of the release composition; and(b) at least 8% plasticizer, based on the total weight of the release composition.This invention also concerns aqueous or semi-aqueous processible flexographic photosensitive elements containing this plasticized polyvinyl alcohol release layer and to processes for making printing reliefs from such elements.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: December 31, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Michael Fryd, Ernst Leberzammer, David W. Swatton
  • Flexographic printing plates containing blended adhesives
    Patent number: 4415649
    Abstract: Photosensitive flexographic element comprising(A) a flexible support,(B) a photosensitive elastomeric layer comprising (a) butadiene/acrylonitrile copolymer having a no. average molecular weight of 20,000 to 75,000 and optionally up to 15% by weight carboxyl content, (b) ethylenically unsaturated monomer and (c) free radical generating system, and between (A) and (B) an adhesive blend of at least two of the following polymers (1) polyester resin, condensation polymer of ethylene glycol, terephthalic acid, isophthalic acid and azelaic acid, 0 to 78% by weight; (2) polyether polyurethane resin having a Brookfield viscosity of 100-1200, 0 to 78% by weight; (3) a polyamide as defined, 0 to 94% by weight; and (4) a polyamide as defined, 0 to 97% by weight, the weight percentages based on the total weight of resin in the adhesive composition. The element is particularly useful for the preparation of flexographic printing plates processed in aqueous or semiaqueous basic solutions.
    Type: Grant
    Filed: June 3, 1982
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Stanley H. Munger, Michael R. Short, David W. Swatton