Aqueous inkjet inks containing a water-insoluble additive
The present disclosure pertains to an aqueous inkjet ink containing a pigment as colorant, a polymeric dispersant, a polymeric binder, and a water-insoluble additive. The inks show improved properties for printing on paper and textile.
1. An aqueous inkjet ink comprising an aqueous vehicle, a pigment, a polymeric dispersant, a polymeric binder and a water insoluble additive, wherein said polymeric dispersant and said polymeric binder are different polymers, and said additive is dispersed by said polymeric dispersant and said polymeric binder, has a solubility in water of less than 5 grams in 100 grams of water, and contains one or more molecules having a structure of Formula I:
wherein W 1 is OR 3 or COOH; W 2 is COOH, SO 3 H or NH 2 ; R 1 is C 1 -C 20 linear alkyl, R 2 is C 1 -C 20 linear alkyl, C 3 -C 20 branched alkyl, C 6 -C 40 aryl or C 6 -C 40 substituted aryl, each R 3 is independently H, C 3 -C 20 branched alkyl, C 3 -C 20 substituted branched alkyl or —C(O)CH(CH 3 ) 2 ; each R 4 is independently H, C 1 -C 20 linear alkyl or C 3 -C 20 branched alkyl; and each R 5 is independently H or C 1 -C 20 linear alkyl.
2. The ink of claim 1 , wherein said additive is present at an amount less than 8% by weight based on the total weight of the ink.
3. The ink of claim 1 , wherein said ink is printed on a textile substrate.
4. The ink of claim 3 , wherein said pigment is a white pigment.
5. The ink of claim 3 , wherein said textile substrate contains a polyvalent cation.
6. The ink of claim 1 , wherein said ink is printed on a paper substrate.
7. The ink of claim 6 , wherein said pigment is a cyan pigment.
8. The ink of claim 1 , wherein said dispersant is a polyurethane.
9. The ink of claim 1 , wherein said dispersant is an acrylic polymer.
10. The ink of claim 1 , wherein R 2 is C 1 -C 20 alkyl.
11. The ink of claim 10 , wherein W 1 is OR 3 .
12. The ink of claim 11 , wherein each R 3 is H.
13. The ink of claim 11 , wherein each R 3 is C 3 -C 20 substituted branched alkyl.
14. The ink of claim 13 , wherein each R 3 is —C(O)CH(CH 3 ) 2 .
15. The ink of claim 10 , wherein R 2 is C 3 -C 20 branched alkyl.
16. The ink of claim 15 , wherein R 2 is —CH(CH 3 ) 2 .
17. The ink of claim 16 , wherein W 1 and is OR 3 .
18. The ink of claim 17 , wherein each R 3 is H.
19. The ink of claim 17 , wherein each R 3 is —C(O)CH(CH 3 ) 2 .