Aqueous ink-jet inks containing branched polyurethanes as binders
View Patent ↗The present disclosure provides novel aqueous ink-jet inks containing an aqueous vehicle, a pigment and a branched polyurethane as a binder.
1. An aqueous ink-jet ink comprising a pigment dispersed in an aqueous vehicle, and a polyurethane binder, wherein said binder is different from any polymeric dispersant in the ink, and said binder has a general structure of Formula I:
wherein each Y is —(C═O)NHW 1 NH(C═O)OR 2 or
—(C═O)NH(CH 2 ) m Si(R 4 ) 3 ;
each X is O, S or NR 3 ;
each R 1 is C 1 -C 20 alkyl, C 6 -C 40 aryl, polyester, polycarbonate, polyamide or polyurethane, each substituted by one or more hydrophilic groups;
each R 2 is C 1 -C 20 alkyl, C 3 -C 20 substituted alkyl, C 6 -C 40 aryl or C 9 -C 40 substituted aryl;
each R 3 is H, C 1 -C 20 alkyl, C 3 -C 20 substituted alkyl, C 6 -C 40 aryl or C 9 -C 40 substituted aryl;
each R 4 is independently H, C 1 -C 20 alkyl, C 3 -C 20 substituted alkyl, C 6 -C 40 aryl, C 9 -C 40 substituted aryl or OR 5 ;
each R 5 is independently H, C 1 -C 20 alkyl or C 6 -C 40 aryl;
each W 1 is independently C 4 -C 20 alkyl, C 4 -C 20 substituted alkyl, C 6 -C 20 cycloalkyl, C 6 -C 20 substituted cycloalkyl, C 6 -C 40 aryl or C 9 -C 40 substituted aryl;
each W 2 is C 1 -C 20 alkyl or C 2 -C 20 substituted alkyl;
m is an integer from 1 to 15; and
n is an integer from 1 to 200.
2. The ink of claim 1 , wherein X is O.
3. The ink of claim 2 , wherein W 1 is C 4 -C 20 alkyl.
4. The ink of claim 3 , wherein Y is —(C═O)NHW 1 NH(C═O)OR 2 .
5. The ink of claim 4 , wherein R 2 is C 1 -C 20 alkyl.
6. The ink of claim 5 , wherein R 1 is C 1 -C 20 alkyl substituted by one or more hydrophilic groups.
7. The ink of claim 6 , wherein said hydrophilic groups are carboxylate, sulfonate, phosphate or quaternary amine.
8. The ink of claim 7 , wherein said hydrophilic groups are carboxylate.
9. The ink of claim 2 , wherein W 1 is C 6 -C 40 aryl.
10. The ink of claim 9 , wherein Y is —(C═O)NHW 1 NH(C═O)OR 2 .
11. The ink of claim 10 , wherein R 2 is C 1 -C 20 alkyl.
12. The ink of claim 11 , wherein R 1 is C 1 -C 20 alkyl substituted by one or more hydrophilic groups.
13. The ink of claim 12 , wherein said hydrophilic groups are carboxylate, sulfonate, phosphate or quaternary amine.
14. The ink of claim 13 , wherein said hydrophilic groups are carboxylate.
15. The ink of claim 1 , wherein said pigment is a self-dispersed pigment.
16. The ink of claim 15 , wherein X is O and W 1 is C 4 -C 20 alkyl.
17. The ink of claim 16 , wherein Y is —(C═O)NHW 1 NH(C═O)OR 2 and R 2 is C 1 -C 20 alkyl.
18. The ink of claim 17 , wherein R 1 is C 1 -C 20 alkyl substituted by one or more hydrophilic groups.
19. The ink of claim 18 , wherein said hydrophilic groups are carboxylate, sulfonate, phosphate or quaternary amine.
20. The ink of claim 19 , wherein said hydrophilic groups are carboxylate.