Laser sensitive lithographic printing plate having specific...

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates

Reexamination Certificate

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Details

C430S271100, C430S284100, C430S309000, C430S434000, C430S435000

Reexamination Certificate

active

11336132

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 a polymeric binder, a multifunctional (meth)acrylate monomer, a free-radical initiator, and a sensitizing dye, with specific weight ratio of the monomer to the polymer. Combination of multifunctional urethane (meth)acrylate monomer and multifunctional non-urethane (meth)acrylate monomer can be advantageously used. 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 developer or with ink and/or fountain solution.

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patent: 2005/0266349 (2005-12-01), Van Damme et al.

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