Patent ID: 7485603

Claim:
A compound of the formula: wherein: each Ar independently represents a polycyclic carbocyclic aromatic moiety having 0 to 3 substituents selected from the group consisting of alkyl, alkoxy, alkoxyalkyl, hydroxy, hydroxyalkyl, halo and combinations thereof; each L is independently a linking moiety comprising a linking group; each Y is independently a moiety of the formula H(O(CR 2 ) n ) y X—, wherein X is selected from the group consisting of (CR′ 2 ) z , O and S; R and R′ are each independently is selected from H, C 1 to C 6 alkyl and aryl; z is 1 to 10; n is 1 to 10 when X is (CR′ 2 ) z , and 2 to 10 when X is O or S; and y is 1 to 30; each a is independently 0 to 3, with the proviso that at least one Ar moiety bears at least one group Y; and m is 2to 25.