Patent ID: 7629424

Claim:
A composition formed by combining compounds comprising: a. a metal-containing precursor unit MU comprising at least one member selected from the group consisting of MA W B X C Y Structure I where M comprises a metal with formal valency of 0-5 selected from Zr, Hf, Ge, Ti, Sn, Zn, Ni, Nb, Eu, In, Al, Mn, Nd, Sb, Mg, or Y; Ligand A is selected individually or in combination from organic compounds with refractive index of at least 1.5; w is 1 to 5; Ligand B contains an ethylenically unsaturated functional group capable of undergoing a combining reaction; x is 0 to 4, with the proviso that x is 0 only when A contains an ethylenically unsaturated functional group capable of undergoing a combining reaction; Ligand C is selected from oxygen, sulfur, a halogen atom, or —XR 1 where X is oxygen or sulfur and R 1 represents an alkyl group, an alkyl ether group, a group containing a halogen atom, or a substituted or unsubstituted aryl group; y is 0 to 4; and the sum of w, x, and y equals 2 to 5 wherein at least a portion of the metal-containing precursor unit contains at least two ethylenically unsaturated functional groups with the proviso that when the sum of w, x, and y equals 2 both ligands contain ethylenically unsaturated functional groups and at least one liqand has a refractive index of at least 1.5 (w=1 or 2,x=0 or 1 and y =0), and b. a catalyst or an initiator capable of inducing a combining reaction of ethylenically unsaturated functional groups of the metal-containing precursor units, wherein the composition is optically clear as measured by the Transmittance Test.