Patent ID: 8702815

Claim:
A cationic dye of formula I CAT + Y − (I), wherein CAT + is a cation selected from azine, xanthene, polymethine, styryl, azo, tetrazolium, pyrylium, benzopyrylium, thiopyrylium, benzothiopyrylium, thiazine, oxazine, triarylmethane, diarylmethane, acridine, quinoline, isoquinoline, and quaternized azafluorenone dyes, Y − is an anion selected from CAB − and FAP −, CAB − conforms to formula (II-1) [B(CN) y1 F 4−y1−x1 (R 0 ) x1 ] − (II-1) y1 is 2, 3 or 4, x1 is 0, 1, or 2, R 0 is alkyl, aryl, fluorinated alkyl, fluorinated aryl, cycloalkyl or alkylaryl, with the condition that R 0 may be hydrogen if y1 is >2, FAP − conforms to formula (II-2) [P(C p2 F 2p2+1−m2 H m2 ) y2 F 6−y2 ] − (II-2), p2 is 1 to 20, m2 is 0, 1, 2 or 3, y2 is 1, 2, 3 or 4 with the proviso that: said cationic dye is not a compound of formula I in which CAT + is a cation of a polymethine dye and Y − is an FAP anion of formula II-2.