Patent ID: 6969759

Claim:
A colorant composition of the formula wherein R is an alkyl group, an aryl group, on arylalkyl group, or an alkylaryl group, and wherein R can be joined to the phenyl moiety to form a ring, Râ€² is a thiophene derivative, a benzothiazole derivative, a thiadiazole derivative, an imidazole derivative, or of the formula each R a , independently of the others, is a halogen atom, an alkyl group, an alkoxy group, a nitrile group, a nitro group, an amide group, or a sulfonamide group, w is an integer of 0, 1, 2, 3, or 4, n is an integer representing the number of carbon atoms in each repeat alkylene oxide unit, and x is an integer representing the number of repeat alkylene oxide units, wherein said colorant has no more than one â€”OH, â€”SH, or primary or secondary amino group per molecule.