Patent ID: 8399558

Claim:
An inorganic-organic hybrid composition comprising: an organic component (A) consisting of: a monomer component (a1) containing a diol (meth)acrylate compound (U) having a urethane bond represented by the formula (1), said monomer component (a1), when polymerized, giving a polymer (P) having a structural unit represented by the formula (6), or a polymer component (a2) containing the polymer (P) having a structural unit represented by the formula (6), said polymer (P) being obtained by polymerization of said monomer component (a1): wherein R 1 stands for a hydrogen atom or a methyl group and R 2 stands for —(CH 2 )n- with n being an integer of 1 to 4, and l denotes an integer indicating that the parenthetic expression is a repeat unit, a cross-linker monomer, and an inorganic component (B), wherein the ratio of said organic component (A) to said inorganic component (B) is 1:99 to 99:1 by mass; and wherein the polymerization is conducted in the presence of a cross-linker monomer and wherein the polymer (P) is cross-linked.