Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Reexamination Certificate
2011-05-03
2011-05-03
Kelly, Cynthia H (Department: 1722)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
C101S463100, C430S270100, C430S281100, C430S286100
Reexamination Certificate
active
07935476
ABSTRACT:
High speed violet or ultraviolet laser sensitive lithographic printing plate comprising on a hydrophilic substrate a specific photosensitive composition is described. The photosensitive layer comprises an alkaline soluble polymeric binder, a multifunctional (meth)acrylate monomer, a free-radical initiator, and a sensitizing dye. The plate is imagewise exposed with a violet or ultraviolet laser at a dosage of less than 300 μJ/cm2, and then developed with an aqueous alkaline developer. Higher monomer to polymer weight ratio is advantageously used. A pigment is preferably incorporated into the photosensitive coating solution as a liquid dispersion. The exposed plate is preferably developed on a processor with an alkaline developer coupled with a replenisher having higher pH.
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Kelly Cynthia H
Robinson Chanceity N
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