Patent ID: 7888441

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 1 MA w B x C y Structure I where M comprises at least one metal selected from the group consisting of Zr, Hf, Ge, and Ti; 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, or a substituted or unsubstituted aryl group; w is 1-5, x is 0-4, y is 0-4, and w+x+y is 1-5; wherein at least a portion of the metal-containing precursor unit contains at least two ethylenically unsaturated functional groups, and b. a catalyst or an initiator capable of inducing a reaction of ethylenically unsaturated functional groups of the metal-containing precursor units, wherein at least 90 weight % of compounds containing ethylenically unsaturated functional groups are represented by Structure I, and the composition is optically clear as measured by the Transmittance Test.