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1. (WO2019009888) COMPOSITION D’ENCRE POUR JET D’ENCRE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1. An aqueous inkjet ink composition comprising:

a yellow azo pigment,

a pigment synergist comprising


where each of R1 to R10 is independently selected from H, a carboxylate and/or a sulphonate group,

a polymeric dispersant,

5 to 20 wt% of a latex polymer,

5 to 40 wt% of an organic co-solvent that has a boiling point of a boiling point in the range of about 170 °C to about 285 °C, and

water.

2. A composition as claimed in claim 1 , wherein the yellow azo pigment is Pigment Yellow 155.

3. A composition as claimed in claim 1 , wherein the pigment synergist comprises Pigment Yellow 12 or a sulphonated or carboxylated derivative thereof.

4. A composition as claimed in claim 1, wherein the pigment synergist further comprises a precipitating agent.

5. A composition as claimed in claim 4, wherein the precipitating agent comprises aluminium oxide and/or aluminium nitrate.

6. A composition as claimed in claim 1 , which comprises about 0.1 to about 3 wt% of pigment synergist.

7. A composition as claimed in claim 1 , which comprises about 1 to about 8 wt% polymeric pigment dispersant.

8. A composition as claimed in claim 1 , wherein the polymeric pigment dispersant is a styrene acrylic resin.

9. A composition as claimed in claim 1 , wherein the organic co-solvent comprises a first co-solvent having a boiling point in the range of about 170 °C to about 215 °C.

10. A composition as claimed in claim 7, wherein the first co-solvent is selected from at least one of 1 ,2-propanediol, 1 ,2-butanediol, ethylene glycol, 2-methyl-2,4-pentanediol1 1 ,3-butanediol, 2-methyl-1 ,3-propanediol and 1 ,3-propanediol.

11. A composition as claimed in claim 1 , wherein the organic co-solvent comprises a second co-solvent that has a boiling point of about 220 °C to about 285 °C.

12. A composition as claimed in claim 1 , wherein the latex polymer comprises a (meth)acrylate or a (meth)acrylamide polymer or copolymer.

13. A composition as claimed in claim 1 , which comprises 0.1 to 2 wt% surfactant.

14. An inkjet cartridge comprising the composition of claim 1.

15. A printed substrate comprising a rigid non-porous print medium, wherein the rigid non-porous print medium has a latex layer deposited on its surface, and wherein the latex layer encapsulates a yellow azo pigment, a pigment synergist and a polymeric dispersant, said pigment synergist comprising a compound of the Formula I