Patent ID: 8518305

Claim:
A photochromic material comprising, a photochromic compound comprising a photochromic substituent selected from the group consisting of photochromic pyrans, photochromic oxazines, and thermally reversible photochromic fulgides, wherein the photochromic substituent has bonded thereto at least one pendent silane group selected from the group consisting of, (i) pendent silane groups represented by the following general formula I, wherein Z for each n is independently Si or C, R is selected from hydrogen or C 1 -C 10 hydrocarbyl, each R 1 is independently C 1 -C 10 hydrocarbyl or halo substituted C 1 -C 10 hydrocarbyl, m is 0 or 1, n is 2 or 3, provided that the sum of m and n is 3, and L is a divalent linking group comprising at least one divalent moiety selected from the group consisting of divalent organic moieties, divalent inorganic moieties and combinations thereof, (ii) pendent silane groups represented by the following general formula II, and combinations thereof, wherein Z, R, R 1 , m, n and L are each independently as described with regard to general formula (I), R a is a divalent linking group selected from divalent organic moieties, R b is selected from hydrogen or C 1 -C 10 hydrocarbyl, t is 0, 1 or 2, and y is 1, 2 or 3, provided that the sum of t and y is 3, wherein said divalent linking group of each L is independently selected from the group consisting of, —C(O)—NH—R 10 —, —R 9 —O—, —O—Si(R 1 ) 2 —R 10 —, wherein each R 1 is independently as described with regard to general formula (I), R 10 in each instance is independently selected from the group consisting of substituted or unsubstituted linear or branched C 1 -C 10 alkylene, substituted or unsubstituted linear or branched C 2 -C 10 alkenylene, substituted or unsubstituted linear or branched C 2 -C 10 alkynylene, substituted or unsubstituted C 3 -C 10 cycloalkylene, and substituted or unsubstituted arylene, R 8 in each instance is independently selected from the group consisting of substituted or unsubstituted linear or branched C 1 -C 20 alkylene, substituted or unsubstituted linear or branched C 2 -C 20 alkenylene, substituted or unsubstituted linear or branched C 2 -C 20 alkynylene, and substituted or unsubstituted C 3 -C 10 cycloalkylene, R 9 in each instance is independently selected from the group consisting of substituted or unsubstituted linear or branched C 1 -C 20 alkylene, substituted or unsubstituted linear or branched C 2 -C 20 alkenylene, substituted or unsubstituted linear or branched C 2 -C 20 alkynylene, substituted or unsubstituted C 3 -C 10 cycloalkylene, and substituted or unsubstituted arylene, and p is from 1 to 100, and p′ is from 1 to 10.