Patent ID: 7482438

Claim:
Dye of formula wherein R 1 is hydrogen; C 1 -C 14 alkyl; hydroxy-C 1 -C 14 alkyl; C 2 -C 14 alkenyl; a radical of formula (1a) —(CH 2 ) n1 —O—(CH 2 ) n2 —CH 3 ; a radical of formula (1b) C 6 -C 10 aryl; or C 6 -C 10 aryl-C 1 -C 6 alkyl; R 3 is hydrogen; C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 6 -C 10 aryl; C 6 -C 10 aryl-C 1 -C 6 alkyl; or CO—R 6 ; R 4 is CO—R 6 ; R 5 is C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 6 -C 10 aryl; or C 6 -C 10 aryl-C 1 -C 6 alkyl; R 6 is hydrogen; C 1 -C 14 alkyl; C 2 -C 14 alkenyl; or C 6 -C 10 aryl; R 7 , R 8 , R 9 and R 10 , independently from each other are hydrogen; or C 1 -C 5 alkyl; m is 1; or 2; An − is an anion; If m=1, R 2 is hydrogen; C 1 -C 14 alkyl; C 2 -C 14 alkenyl; a radical of formula (1a); a radical of formula (1b); C 6 -C 10 aryl; or C 6 -C 10 aryl-C 1 -C 6 alkyl; If m=2, R 2 is the direct bond; or C 1 -C 14 alkylene, which is optionally substituted by one or more C 1 -C 4 alkyl, or which is optionally interrupted by C 5 -C 10 arylene, —O— or —NR 9 R 10 —; R 9 and R 10 , independently from each other are hydrogen; or C 1 -C 5 alkyl; and n1, n2, n3 and n4, independently from each other are a number from 0 to 5.