Patent ID: 8648157

Claim:
A composition formed by reacting compounds comprising: a. a metal-containing precursor unit MU comprising at least one member selected from the group consisting of 1) a unit represented by Structure I MA w B x C y Structure I where M comprises a metal with valency of 1-5 selected from Zr, Hf, Ge, Ti, Gd, Pb, Sn, Zn, Ni, Na, Li, K, Ce, Nb, Eu, In, Al, Fe, Mn, Nd, Cu, Sb, Mg, Ag, and Y; A comprises at least one member selected from the group consisting of: where R 1 is a H atom, an alkyl group containing 1-8 carbon atoms, a group containing a halogen atom, or a hydroxyalkyl group, and n is 0-6; R 2 represents an alkyl group or a substituted or unsubstituted aryl group, and z is 1-3; B and C each comprise a member selected from the group consisting of oxygen, sulfur, a halogen atom and —OR 3 where R 3 represents an alkyl group, a halo-alkyl group, a substituted or unsubstituted aryl group; w is 2-5, x is 0-4, y is 0-4, and w+x+y is 2-5; b. a prepolymer unit PU containing at least two ethylenically unsaturated functional groups and at least one oxygen, sulfur or nitrogen atom, c. a catalyst or an initiator capable of inducing a reaction of ethylenically unsaturated functional groups of the metal-containing precursor unit and the prepolymer unit, and d. an inert solvent, wherein 7-90 weight % of compounds containing ethylenically unsaturated functional groups are represented by Structure I, the composition is a homogeneous solution and, after reaction, the composition is optically clear as measured by the Transmittance Test.