Patent ID: 7550586

Claim:
An optical limiter composition comprising a phthalocyanine compound with peripheral siloxane substitution on the benzo ring substructures having the structure: wherein —W—X—Y—Z are peripheral groups comprising individual W, X, Y, and Z subgroups; wherein W is covalently bonded to any of the numbered positions on the benzo ring substructures; wherein each of the benzo ring substructures may have 0, 1, or 2 of the —W—X—Y—Z peripheral groups; wherein W is a linkage represented by the formula: —D—(R 1 ) 0,1 —; wherein D is an atom selected from the group consisting of sulphur and oxygen; and R 1 is a intermediary selected from the group consisting of aryl and alkyl hydrocarbons; wherein X is: —(CH 2 ) n —; wherein n=2 to 8; wherein Y is a siloxane chain having the formula: wherein m=3 to 100; and wherein B is a pendant substituent selected from the group consisting of —C p H 2p+1 where p=1 to 4; —C 6 H 5 ; —CH 2 CH 2 CF 3 ; and combinations thereof wherein Z is a terminal cap on the free end of the W—X—Y—Z peripheral groups selected from the group consisting of —H; linear alkyl group represented by the formula —C q H 2q+1 where q=1 to 8; branched alkyl group represented by the formula —C q H 2q+1 where q=1 to 8; and an aryl group; and wherein M is two protons or a metal ion.