Patent ID: 8173720

Claim:
A transparent gel comprising an interpenetrating polymer network of a copolymer and a hydrophilic polymer, the copolymer having a polysiloxane structure and a polycarbonate structure and the hydrophilic polymer being obtained by polymerizing a hydrophilic monomer and a cross linking agent; wherein the above copolymer having a polysiloxane structure and a polycarbonate structure is derived from a compound shown by the general formula (A) and a compound shown by the general formula (B) and a compound forming a carbonic acid ester, general formula (A): (wherein R 1 and R 2 are, respectively and independently, a member selected from the group consisting of a hydrogen atom, an alkyl group of C1-C10, an aryl group of C6-C12, an alkenyl group of C2 to C5, an alkoxy group of C1 to C5 and an aralkyl group of C7-C17, and when those groups have a carbon atom, those groups may contain a substituent selected from the group consisting of an alkyl group of C1 to C5, an alkenyl group of C2 to C5 and an alkoxy group of C1 to C5, Y is a group shown by the formula: (wherein R 3 to R 6 are respectively a member selected from the group consisting of a hydrogen atom, an alkyl group of C1 to C10, an alkenyl group of C2 to C10, an alkoxy group of C1 to C10 and an aryl group of C6 to C12, or both R 3 and R 4 and both R 5 and R 6 are respectively combined together to form a carbon ring or a heterocyclic ring, and when those groups contain a carbon atom, those groups may have a substituent selected from the group consisting of an alkyl group of C1 to C5, an alkenyl group of C2 to C5 and an alkoxy group of C1 to C5, and a is an integer of 0 to 20), general formula (B): (wherein R 7 to R 14 are respectively and independently a member selected from the group consisting of a hydrogen atom, an alkyl group of C1 to C5, an aryl group of C6 to C12, an alkenyl group of C2 to C5, an alkoxy group of C1 to C5 and an aralkyl group of C7 to C17, and when those groups contain a carbon atom, those groups may have a substituent selected from the group consisting of an alkyl group of C1 to C5, an alkenyl group of C2 to C5 and an alkoxy group of C1 to C5, R 15 is an aliphatic group of C1 to C6 or only shows a bond, X is a single polymer or a random copolymer of —SiO(R 16 )(R 17 )— and/or —SiO(R 18 )(R 19 )— and its polymerization degree is 0 to 200, and R 16 to R 19 are respectively and independently a member selected from the group consisting of a hydrogen atom, an alkyl group of C1 to C5, an aryl group of C6 to C12, an alkenyl group of C2 to C5, an alkoxy group of C1 to C5 and an aralkyl group of C7 to C17, and when those groups contain a carbon atom, those groups may have a substituent selected from the group consisting of an alkyl group of C1 to C5, an alkenyl group of C2 to C5 and an alkoxy group of C1 to C5); and wherein the above hydrophilic monomer is N-vinyl pyrrolidone, N,N-dimethylacrylamide and/or N-methyl-3-methylidene pyrrolidone; and wherein a ratio of said copolymer to said hydrophilic monomer is 5:95 to 40:60 by weight.