Aqueous ink-jet ink containing polyurethane binder for printing on textile

1. An ink-jet ink for printing on textile comprising an aqueous ink vehicle, an aqueous pigment dispersion and a cross-linked polyurethane binder, wherein said aqueous pigment dispersion is prepared by dispersing a colorant with a polyurethane dispersant followed by cross-linking of said dispersant, and said cross-linked polyurethane binder is different from said polyurethane dispersant and non-reactive to said colorant, and wherein said polyurethane dispersant prior to being cross-linked comprises at least one compound of the general structure of Formula I:

wherein each X is independently OH, SH, COOH or NR 4 R 5 ;

each Y is independently O, S or NR 4 ;

each W is NH, O or S;

each R 1 is independently C 1 -C 20 alkylene, C 3 -C 20 substituted alkylene, C 6 -C 40 arylene or C 9 -C 40 substituted arylene;

R 2 is comprised of difunctional isocyanate reactants Z 1 , Z 2 and Z 3 , wherein Z 2 may be the same as Z 1 , or Z 2 may be the same as Z 3 , provided that Z 2 has one or more cross-linkable moieties;

each R 3 is independently C 1 -C 20 alkyl or C 3 -C 20 substituted alkyl;

each R 4 is independently —R 3 —A, C 1 -C 20 alkyl or C 3 -C 20 substituted alkyl;

each A is independently OH, SH or COOH;

each R 5 is independently C 1 -C 20 alkyl or C 3 -C 20 substituted alkyl;

NR 4 R 5 can be taken together with Z to form a 5-membered through 7-membered cyclic structure of Formula II:

Z is —(CH 2 )—, —(CH 2 ) 2 —, NR 6 , O or S;

R 6 is H or C 1 -C 20 alkyl;

n is an integer from 2 to 30;

Z 1 is a difunctional isocyanate reactant substituted with an aqueous dispersing moiety;

Z 2 is a difunctional isocyanate reactant substituted with one or more cross-linkable moieties; and

Z 3 is a polyol with a weight average molecular weight of less than 3000.

2. The ink of claim 1 , wherein said ink does not contain a melamine crosslinker.

3. The ink of claim 1 , wherein the cross-linking agent is one or more members selected from the group consisting of epoxide, isocyanate, carbodiimide, N-methylol, oxazoline, silane, and mixtures thereof.

4. The ink of claim 3 , wherein Y is NR 4 .

5. The ink of claim 4 , wherein X is OH.

6. The ink of claim 4 , wherein X is NR 4 R 5 .

7. The ink of claim 6 , wherein NR 4 R 5 is taken together with Z to form a 5-membered through 7-membered cyclic structure of Formula II:

8. The ink of claim 7 , wherein NR 4 R 5 is taken together with Z to form a 6-membered ring.

9. The ink of claim 8 , wherein Z is O.

10. The ink of claim 9 , wherein R 4 and R 5 are independently C 1 -C 3 alkylene.