Liquid photopolymer useful in fabricating printing plates which are resistant to solvent based ink
AssigneeMacDermid Imaging Technology, Inc.
InventorMisty Huang
Life of this patent
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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.
Claims21
A photosensitive resin composition comprising:
- a). an ethylenically unsaturated polyurethane prepolymer of the following structure:
- Y—X[Parenopenst]P—X[Parenclosest]nY
- wherein P is a saturated polyolefine;
- wherein X is independently selected from the group consisting of aromatic diisocyanates and aliphatic diisocyanates;
- wherein Y is a terminal group which has an ethylenically active portion at the outer end of said group;
- and
- wherein n is an integer of from 1 to 20;
- b). at least one ethylenically unsaturated monomer;
- and
- c). at least one photopolymerization initiator.
A process for fabricating a printing plate, said process comprising:
- a). selectively contacting a photosensitive resin composition comprising:
- 1) an ethylenically unsaturated polyurethane prepolymer of the following structure:
- Y—X[Parenopenst]P—X[Parenclosest]nY
- wherein P is a saturated polyolefine;
- wherein X is independently selected from the group consisting of aromatic diisocyanates and aliphatic diisocyanates;
- wherein Y is a terminal group which has an ethylenically active portion at the outer end of said group;
- and
- wherein n is an integer of from 1 to 20;
- 2) at least one ethylenically unsaturated monomer;
- and
- 3) at least one photopolymerization initiator;
- with actinic radiation;
- and
- b) developing away any unpolymerized photosensitive resin.
A method of forming an ethylenically unsaturated polyurethane prepolymer comprising:
- a) reacting an excess of a diisocyanate with diols selected from the group consisting of saturated polyolefine diols, a mixture of saturated polydefine diols with unsaturated polyolefine diols, a mixture of saturated polyolefine diols with short claim diols and a mixture of saturated polyolefine diols with polyester diols, to form an oligomer;
- and
- b) further reacting the oligomer with a compound selected from the group consisting of hydroxyacrylates, hydroxymethacrylates and mixtures thereof.
A printing plate comprising the photochemical reaction product of:
- (a) an ethylenically unsaturated polyurethane prepolymer which prepolymer was prepared by:
- 1). reacting an excess of a diisocyanate with diols selected from the group consisting of saturated polyolefine diols, a mixture of saturated polyolefine diols with unsaturated polyolefine diols, a mixture of saturated polyolefine diols with short chain diols and a mixture of saturated polyolefine diols with polyester diols, to form an oligomer;
- and
- 2). further reacting the oligomer with a compound selected from the group consisting of hydroxyacrylates, hydroxymethacrylates and mixtures thereof;
- (b) at least one ethylenically unsaturated monomer;
- and
- (c) at least one photopolymerization initiator.
Dependencies are inferred from the claim text.