Light-stabilized ink compositions

Claim 1

A method of stabilizing an ink jet print against the deleterious effects of light which comprises preparing an aqueous solution containing at least 30% by weight of water and (i) an effective coloring amount of a water soluble dye, and (ii) 0.01 to 20% by weight, based on the total solution, an effective stabilizing amount, of at least one compound of formula I ##STR9## wherein R 1 is hydrogen, C 1 -C 4 alkyl, a group --R 4 --SO 3 M or --R 4 --CO 2 M, R 2 , if R 1 is H or C 1 -C 4 alkyl, is a --SO 3 M group and, if R 1 is --R 4 --CO 2 M or --R 4 --SO 3 M, is H or --SO 3 M, R 3 is hydrogen, R 4 is unsubstituted or OH-substituted C 1 -C 4 alkylene, X and Y are each independently of the other a group of formula II or III ##STR10## wherein R 5 is hydrogen, C 1 -C 4 alkyl, --R 4 --CO 2 M or --R 4 --SO 3 M R 6 is hydrogen, Cl, C 1 -C 4 alkyl or --SO 3 M, R 7 is hydrogen, R 8 , R 9 and R 10 are each independently of one another H, Cl, C 1 -C 4 alkyl, phenyl or --SO 3 M, and M is hydrogen, Li, Na, K, 1/2Ca, 1/2Mg, 1/2Zn, 1/2Co(II), 1/2Cu(II), 1/2Ni(II), 1/3Cr(III), 1/3Fe(III), ##STR11## wherein R 11 , R 12 , R 13 and R 14 are each independently of one another H, C 1 -C 12 alkyl, 2-hydroxyethyl, cyclohexyl, phenyl or benzyl, and then applying said aqueous solution as an ink onto a recording material for ink jet printing to form an ink jet print containing an effective stabilizing amount of said compound of formula I.

Claim 2

A method of stabilizing an ink jet print against the deleterious effects of light which comprises preparing an aqueous solution containing at least 30% by weight of water and (i) an effective coloring amount of a water soluble dye, and (ii) 0.01 to 20% by weight, based on the total solution, an effective stabilizing amount, of at least one compound of formula I ##STR9## wherein R 1 is hydrogen, C 1 -C 4 alkyl, a group --R 4 --SO 3 M or --R 4 --CO 2 M, R 2 , if R 1 is H or C 1 -C 4 alkyl, is a --SO 3 M group and, if R 1 is --R 4 --CO 2 M or --R 4 --SO 3 M, is H or --SO 3 M, R 3 is hydrogen, R 4 is unsubstituted or OH-substituted C 1 -C 4 alkylene, X and Y are each independently of the other a group of formula II or III ##STR10## wherein R 5 is hydrogen, C 1 -C 4 alkyl, --R 4 --CO 2 M or --R 4 --SO 3 M R 6 is hydrogen, Cl, C 1 -C 4 alkyl or --SO 3 M, R 7 is hydrogen, R 8 , R 9 and R 10 are each independently of one another H, Cl, C 1 -C 4 alkyl, phenyl or --SO 3 M, and M is hydrogen, Li, Na, K, 1/2Ca, 1/2Mg, 1/2Zn, 1/2Co(II), 1/2Cu(II), 1/2Ni(II), 1/3Cr(III), 1/3Fe(III), ##STR11## wherein R 11 , R 12 , R 13 and R 14 are each independently of one another H, C 1 -C 12 alkyl, 2-hydroxyethyl, cyclohexyl, phenyl or benzyl, and then applying said aqueous solution as an ink onto a recording material for ink jet printing to form an ink jet print containing an effective stabilizing amount of said compound of formula I.