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US 5,210,004 AGranted
Photopolymerizable printing plate for flexographic printing
AssigneeE. I. Du Pont de Nemours and Company
InventorWerner Abele
Life of this patent
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Abstract
A photopolymerizable printing element comprising a photopolymerizable layer and an elastomeric layer coated thereon wherein said elastomeric layer contains at least one thermoplastic, elastomeric block copolymer and at least one reaction product of an epoxide resin with a rosin derivative. The element produces flexographic printing plates having improved printing results with aqueous and alcoholic printing inks.
Claims8
A photopolymerizable printing element comprising:
- (a) a support;
- (b) a photopolymerizable layer containing at least one elastomeric binder, at least one ethylenically unsaturated monomer addition-polymerizable by actinic radiation, and a photoinitiator or photoinitiator system;
- (c) an elastomeric layer containing at least one thermoplastic, elastomeric block copolymer;
- and
- (d) a cover sheet, wherein the elastomeric layer (c) further contains at least one compound produced by (i) reacting rosins with at least one compound selected from the group consisting of ethylenically unsaturated monocarboxylic acids, ethylenically unsaturated monocarboxylic acid anhydrides, ethylenically unsaturated polycarboxylic acids, and ethylenically unsaturated polycarboxylic acid anhydrides, (ii) reacting the compound produced by (i) with at least one polyol to esterify a part of the carboxylic acid groups of the compound produce by (i), and (iii) reacting the compound partially esterified by (ii) with at least one epoxide resin.
2 more elements
A process for preparing a photopolymerizable printing element comprising:
- (a) feeding into the nip of a calender, a photopolymerizable composition containing at least one elastomeric binder, at least one ethylenically unsaturated monomer additionally polymerizable by actinic radiation, and a photoinitiator or photoinitiator system;
- (b) calendering the photopolymerizable composition between a support (a) and a multilayer cover element thereby forming a photopolymerizable layer (b) between them, said multilayer cover element comprising an elastomeric layer (c) and a cover sheet (d),
- wherein the elastomeric layer (c) further comprises at least one thermoplastic elastomeric block copolymer and at least one compound produced by (i) reacting rosins with at least one compound selected from the group consisting of ethylenically unsaturated monocarboxylic acids, ethylenically unsaturated monocarboxylic acid anhydrides, ethylenically unsaturated polycarboxylic acids, and ethylenically unsaturated polycarboxylic acid anhydrides, (ii) reacting the compound produced by (i) with at least one polyol to esterify a part of the carboxylic acid groups of the compound produced by (i), and (iii) reacting the compound partially esterified by (ii) with at least one epoxide resin.
Dependencies are inferred from the claim text.