Patents Assigned to Citiplate, Inc.
  • Thermally sensitive coating compositions containing mixed diazo novolaks useful for lithographic elements
    Patent number: 6436601
    Abstract: An infrared imaging composition comprises a mixture of at least two novolak resins esterified with from about 0.1 to 50 mole % of a 2-diazo-1-naphthol-4 or 5-sulfonic acid or derivative thereof, wherein the degree of esterification of one novolak differs from the degree of esterification of the other by at least about 3 mole %, further mixed with an infrared radiation absorbing compound. When applied to a proper support and processed, the composition is useful as an offset lithographics printing plate, color proofing film or image resist.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: August 20, 2002
    Assignee: Citiplate, Inc.
    Inventors: Prakash Seth, Charles S. Cusumano