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US 5,688,633 AGranted
Soft relief photopolymer printing plates for flexographic printing
AssigneeMacDermid Imaging Technology, Inc.
InventorDouglas R. Leach
Life of this patent
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Abstract
A photosensitive resin composition includes a urethane oligomer prepared from a hydroxy-functionalized acrylate and/or methacrylate, at least one diol, and 2,4-toluene diisocyanate and 2,6-toluene diisocyanate in a 65:35 weight ratio. The resin composition additionally contains a monomer having at least one acrylate or methacrylate group, and a photoreactive initiator. The photosensitive resin composition may be cured to provide a soft photopolymer printing plate, particularly well suited for printing on corrugated bard.
Claims4
A photosensitive resin composition comprising
- (i) an urethane oligomer;
- (ii) a monomer having at least one ethylenically unsaturated group;
- and
- (iii) a photopolymerization initiator;
- wherein said urethane oligomer is the reaction product of a polyol, a hydroxy-functionalized acrylate or methacrylate, and a mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate in a weight ratio of, 65 to 35 respectively, and wherein said polyol is a mixture of a poly (alkylene oxide) diol and a polyester diol.
2 more elements
Dependencies are inferred from the claim text.