Patent ID: 7105588

Claim:
A screen printable hydrogel composition comprising: (a) A soluble or partially soluble polymer wherein said polymer is a photocrosslinkable polymer which is a copolymer, interpolymer or mixture thereof, wherein each copolymer or interpolymer comprises (1) a nonacidic comonomer comprising a C 1-10 alkyl acrylate, C 1-10 alkyl methacrylate, styrenes or combinations thereof; (2) an acidic comonomer and its salts comprising ethylenically unsaturated carboxylic acid containing moiety, wherein 2–25% of the carboxylic acid containing moiety is reacted with a reactive molecule having a first and second functional unit wherein the first functional unit is a vinyl group and the second functional unit is capable of forming a chemical bond by reaction with the carboxylic acid moiety; (3) third comonomer units formed from the reacted portion of acidic comonomers; and (4) a nonacidic comonomer comprising C1–10 alkyl or alkoxy methacrylate or acrylate; (b) initiation system; (c) thickener; (d) water; and (e) solvent; with the proviso that the composition has a viscosity of greater than about 10 Pa·s and wherein said composition is a screen printable hydrogel composition.