Appeal No. 2001-1986
Application No. 08/719,968
1). an ethylenically unsaturated polyurethane prepolymer which is the reaction
product of X, Y and P and which prepolymer has the following structure:
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.
23. 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
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