US 4,361,640 AGranted

Aqueous developable photopolymer compositions containing terpolymer binder

AssigneeE. I. Du Pont de Nemours and Company

InventorHerbert J. Pine

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Abstract

Compatible, aqueous developable photopolymerizable composition consisting essentially of (a) 22 to 32% by wt. of a monomeric compound having at least two terminal ethylenic groups, (b) 0.1 to 5.0% by wt of a photoinitiator or initiator system, (c) 40 to 80% by wt of a binder system which is the reaction product of (1) 65 to 87 parts by wt of a terpolymer of methylmethacrylate, butylmethacrylate and methacrylic acid as defined, (2) 5 to 20 parts by wt of a polyamide resin and (3) 5 to 20 parts by wt of a copolymer of vinyl pyrrolidone and vinyl acetate, (d) 0.03 to 0.10% by wt of a thermal polymerization inhibitor, and optionally up to 18% by wt of a plasticizer and up to 2.0% by wt of a tertiary amine capable of salt formation with a carboxylic acid. Aqueous developable photopolymerizable elements comprise a support bearing a layer of the composition. Relief printing plates can be prepared by imagewise exposing and developing the elements.

Claims13

Dependent claims

A compatible, aqueous developable photopolymerizable composition consisting essentially of

(a) 22 to 32% by weight of an ethylenically unsaturated monomeric compound having at least two terminal ethylenic groups capable of forming a high polymer by free-radical initiated chain-propagated addition polymerization;
(b) 0.1 to 5.0% by weight of a free radical generating, addition polymerization initiator or initiator system activatable by actinic radiation;
(c) 40 to 80% by weight of a binder system which is the reaction product of
(1) 65 to 87 parts by weight of a terpolymer of methylmethacrylate, butylmethacrylate, and methacrylic acid, the terpolymer having an acid number of 175 to 200 and an inherent viscosity of about 0.4 to 0.5,
(2) 5 to 20 parts by weight of amine-terminated polyamide resin, and
(3) 5 to 20 parts by weight of a copolymer of vinyl pyrrolidone and vinyl acetate;
(d) 0.03 to 0.10% by weight of a thermal polymerization inhibitor;
(e) 0 to 18% by weight of a plasticizer for the composition;
and
(f) 0 to 2% by weight of a tertiary amine capable of salt formation with a carboxylic acid, the percentages of the composition components being based on the total weight of the composition.

7 more elements

Dependencies are inferred from the claim text.