Patent ID: 6399278
Filing Date: 2002-06-04
Classification: B41M,G03F

Abstract:
A photosensitive resin composition comprising(i) a urethane oligomer; (ii) an ethylenically unsaturated compound; and (iii) a photopolymerization initiator; â€ƒwherein said urethane oligomer is the reaction product of (a) polyether diol compounds X and Y, (b) a polyisocyanate, and (c) a hydroxy-functionalized acrylate or methacrylate, wherein diol compound X has the formula Hâ€”(â€”Oâ€”R1)mâ€”OH wherein R1 is independently selected from the group consisting of ethylene and iso-propylene, m is an integer between 5-100 inclusive, and wherein the diol compound X has a majority of iso-propylene R1 units in relation to the total R1 units; and diol compound Y has the formula Hâ€”(Oâ€”R2â€”)nâ€”OH wherein R2 is independently selected from the group consisting of ethylene, propylene, butylene, ethylene branch substituted with 0-5 C1-C4 aliphatic groups, propylene branch substituted with 0-5 C1-C4 aliphatic groups, butylene branch substituted with 0-5 C1-C4 aliphatic groups and mixtures thereof, n is an integer between 5-100 inclusive, the total number of carbon atoms in Y divided by n is at least 3.5, diol compound Y has a melting point equal to or less than 22Â° C., and Y contributes at least 15 weight percent of the polyether diol compounds x and y.