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US 6,555,292 B1Granted
Liquid photopolymer useful in fabricating printing plates which are resistant to solvent based ink
OwnerMisty Huanginventor
Life of this patent
Estimating the term…
Abstract
A polymer based on the reaction of an excess of diisocyanate with saturated polyolefine diols to form an oligomer and further reaction of the oligomer with hydroxyacrylates or hydroxymethacrylates is discussed. The polymer is then blended with ethylenically unsaturated monomers and a photoinitiator to produce a photosensitive composition which is useful in fabricating printing plates.
Claims5
A process for fabricating a printing plate, said process comprising:
- a). selectively exposing a photosensitive resin composition consisting essentially of:
- 1). an ethylenically unsaturated polyurethane prepolymer which is the reaction product of X, Y and P and which prepolymer has the following structure:
- Y′−X′[Parenopenst]P′−X′[Parenclosest]nY′
- wherein P is selected from the group consisting of hydrogenated polybutadiene diols, hydrogenated polyisoprene diols, copolymer diols of hydrogenated butadiene with styrene, mixtures of any of the foregoing diols, and mixtures of any of the foregoing diols with a compound selected from the group consisting of unsaturated polyolefin diols, short chain diols, and mixtures of any of the foregoing;
- wherein X is independently selected from the group consisting of aromatic diisocyanates, aliphatic diisocyanates and mixtures of the foregoing;
- wherein Y is selected from the group consisting of acrylates, methacrylates and mixtures of the foregoing;
- wherein n is an integer of from 1 to 20;
- wherein P′, X′ and Y′ are the reaction residues of P, X and Y;
- 2). at least one ethylenically unsaturated monomer;
- and
- 3). at least one photopolymerization initiator;
- to actinic radiation;
- and
- b). developing away any unpolymerized photosensitive resin.
11 more elements
A process for fabricating a printing plate, said process comprising:
- a). selectively exposing a photosensitive resin composition comprising:
- 1). an ethylenically unsaturated polyurethane prepolymer which prepolymer is formed by:
- (a) reacting an excess of a diisocyanate with diols, which diols are selected from the group consisting of hydrogenated polybutadiene diols, hydrogenated polyisoprene diols, copolymer diols of hydrogenated butadiene with styrene, mixtures of any of the foregoing diols, and mixtures of any of the foregoing diols with a compound selected from the group consisting of unsaturated polyolefin diols, short chain diols, and mixtures of any of the foregoing, to form an oligomer, and (b) further reacting the oligomer with a compound selected from the group consisting of hydroxyacrylates, hydroxymethacrylates and mixtures of the foregoing;
- 2). at least one ethylenically unsaturated monomer;
- and
- 3). at least one photopolymerization initiator;
- to actinic radiation;
- and
- b). developing away any unpolymerized photosensitive resin.
6 more elements
Dependencies are inferred from the claim text.