WATER-DEVELOPABLE PHOTOSENSITIVE LITHOGRAPHIC PRINTING PLATE MATERIAL
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United States of America Patent
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Issued Date -
May 6, 2010
app pub date -
Mar 21, 2008
filing date -
Mar 23, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention provides a highly sensitive photosensitive lithographic printing plate material capable of being used in a CTP system, which allows on-press development and/or development with water and has superior printability. More specifically, the present invention provides a water-developable photosensitive lithographic printing plate material comprising a support; on the support, a hydrophilic layer containing a water-soluble polymer, a crosslinking agent which forms a cross-linking network with the water-soluble polymers, and colloidal silica, wherein the weight ratio of the water-soluble polymer to the colloidal silica is within the range of 1:1 to 1:3; and, on the hydrophilic layer, a photocurable photosensitive layer containing a polymer having a sulfonic acid group and a vinylphenyl group in a side chain wherein the vinylphenyl group is attached to a main chain through a linking group containing a hetero ring, a photopolymerization initiator, and a compound which sensitizes the photopolymerization initiator.
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