Patent ID: 8647538

Claim:
A photochromic compound represented by the following Formula (I), wherein L 1 is a multivalent linking group selected from the group consisting of multivalent amine, multivalent linear or branched optionally substituted C 1 -C 20 alkyl, multivalent optionally substituted C 3 -C 12 cycloalkyl, multivalent optionally substituted C 3 -C 12 heterocycloalkyl, multivalent optionally substituted aryl, multivalent optionally substituted heteroaryl, —(R 4 —O) q — wherein R 4 for each q is independently selected from divalent linear or branched C 1 -C 12 alkyl, and q is from 1 to 50, and combinations of two or more thereof, n is at least 2, R 1 for each n is independently selected from group consisting of a bond, divalent linear or branched optionally substituted C 1 -C 20 alkyl, divalent optionally substituted C 3 -C 12 cyclo alkyl, divalent optionally substituted C 3 -C 12 heterocycloalkyl, divalent optionally substituted aryl, divalent optionally substituted heteroaryl, and combinations of two or more thereof, X 1 for each n and X 2 for each n are each independently selected from the group consisting of O, NH, and a bond, provided that when R 1 is a bond and X 1 is a bond, R 1 and X 1 together define a bond, L 2 for each n is independently selected from a group represented by the following Formula (II), wherein R 2 for each t is independently selected from the group consisting of a bond, divalent linear or branched C 1 -C 20 alkyl, divalent optionally substituted C 3 -C 12 cycloalkyl, divalent optionally substituted aryl, divalent optionally substituted heteroaryl, and combinations of two or more thereof, R 3 for each p is independently selected from the group consisting of divalent linear or branched C 1 -C 20 alkyl, divalent optionally substituted C 3 -C 12 cycloalkyl, divalent optionally substituted aryl, divalent optionally substituted heteroaryl, and combinations of two or more thereof, X 3 for each t and X 4 for each t are each independently selected from the group consisting of O, NH and a bond, provided that when R 2 is a bond and X 3 is a bond, R 2 and X 3 together define a bond, and provided that when X 2 is a bond, R 2 is a bond, X 3 is a bond, and t is greater than 0, X 2 , R 2 and X 3 together define a bond, t, for each n, is 0 to 100, and p, for each n, is 0 to 20, provided that the sum of t and p is greater than 0, and PC for each n is independently a photochromic moiety.