Radiation-sensitive composition containing a resole resin and a novolac resin and use thereof in lithographic printing plates
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United States of America Patent
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Aug 23, 1994
Issued Date -
N/A
app pub date -
Aug 4, 1993
filing date -
May 19, 1993
priority date (Note) -
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Abstract
A radiation-sensitive composition especially adapted to prepare a lithographic printing plate that is sensitive to both ultraviolet and infrared radiation and capable of functioning in either a positive-working or negative-working manner is comprised of (1) a resole resin, (2) a novolac resin, (3) a latent Bronsted acid and (4) an infrared absorber. The solubility of the composition in aqueous alkaline developing solution is both reduced in exposed areas and increased in unexposed areas by the steps of imagewise exposure to activating radiation and heating.
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