Inkjet ink with reduced bronzing

• US 20040092622A1
• Filed: 06/26/2003
• Published: 05/13/2004
• Est. Priority Date: 07/01/2002
• Status: Abandoned Application

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Jenkins, Lauri L., Pearlstine, Kathryn Amy
• Application Number:
  US10/607,378
• Publication Number:
  US 20040092622A1
• Time in Patent Office: Days
• US Class Current: 523/160
• CPC Class Codes: C08F 283/006 on to polymers provided for in C08G18/00 C08F283/004 takes precedence
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/2825 having at least 6 carbon atoms
• CPC Class Codes: C08G 18/289 containing silicon
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/3234 cycloaliphatic
• CPC Class Codes: C08G 18/4216 from mixtures or combinations of aromatic dicarboxylic acids and aliphatic dicarboxylic acids and dialcohols
• CPC Class Codes: C08G 18/423 containing cycloaliphatic groups
• CPC Class Codes: C08G 18/6659 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/672 Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
• CPC Class Codes: C09D 11/32 characterised by colouring agents
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/40 Ink-sets specially adapted for multi-colour inkjet printing

Abstract

This invention pertains to an aqueous inkjet ink based on a cyan copper phthalocyanine pigment dispersed in an aqueous vehicle and, more particularly, to the use of polyurethanes to reduce bronzing in the printed ink typically associated with this pigment.

Claims

1. An aqueous inkjet ink comprising an aqueous vehicle having dispersed therein (1) a cyan copper phthalocyanine pigment and (2) a polyurethane, provided that:

(i) the cyan copper phthalocyanine pigment is not dispersed in the aqueous vehicle by a sodium aromaticsulfonate-formaldehyde condensate dispersant; and

/or

(ii) the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 2.5.

2. The aqueous inkjet ink of claim 1, wherein (i) the cyan copper phthalocyanine pigment is not dispersed in the aqueous vehicle by a sodium aromaticsulfonate-formaldehyde condensate dispersant;

and (ii) the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 2.5.

3. The aqueous inkjet ink of claim 1, wherein the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 1.5.

4. The aqueous inkjet ink of claim 1, wherein the pigment is PB 15:

3 or PB 15;

4.

5. The aqueous inkjet ink of claim 1, wherein the polyurethane is dispersed in the aqueous vehicle as an anionically stabilized polyurethane dispersion.

6. The aqueous inkjet ink of claim 1, wherein the cyan copper phthalocyanine pigment is a self-dispersing pigment.

7. The aqueous inkjet ink of claim 1, wherein the cyan copper phthalocyanine pigment is dispersed in the aqueous vehicle with a polymeric dispersant.

8. The aqueous inkjet ink of claim 1, comprising from about 70% to about 99.8% aqueous vehicle, from about 0.1 to about 8% cyan copper phthalocyanine pigment, and about 0.1 to about 10% polyurethane (solids), based on the total weight of the ink.

9. The aqueous inkjet ink of claim 1, having a surface tension in the range of about 20 dyne/cm to about 70 dyne/cm at 25°

C., and a viscosity in the range of about 1 cP to about 30 cP at 25°

C.

10. An aqueous inkjet ink comprising a mixture of (1) an aqueous vehicle, (2) a cyan copper phthalocyanine pigment and (3) a polyurethane dispersion, such that the pigment and polyurethane are dispersed in the aqueous vehicle, provided that:

(i) the cyan copper phthalocyanine pigment is not dispersed in the aqueous vehicle by a sodium aromaticsulfonate-formaldehyde condensate dispersant; and

/or

(ii) the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 2.5.

11. The aqueous inkjet ink of claim 10, wherein (i) the cyan copper phthalocyanine pigment is not dispersed in the aqueous vehicle by a sodium aromaticsulfonate-formaldehyde condensate dispersant;

and (ii) the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 2.5.

12. The aqueous inkjet ink of claim 10, wherein the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 1.5.

13. The aqueous inkjet ink of claim 10, wherein the pigment is PB 15:

3 or PB 15;

4.

14. The aqueous inkjet ink of claim 10, wherein the polyurethane is dispersed in the aqueous vehicle as an anionically stabilized polyurethane dispersion.

15. The aqueous inkjet ink of claim 10, wherein the cyan copper phthalocyanine pigment is a self-dispersing pigment.

16. The aqueous inkjet ink of claim 10, wherein the cyan copper phthalocyanine pigment is dispersed in the aqueous vehicle with a polymeric dispersant.

17. The aqueous inkjet ink of claim 10, comprising from about 70% to about 99.8% aqueous vehicle, from about 0.1 to about 8% cyan copper phthalocyanine pigment, and about 0.1 to about 10% polyurethane (solids), based on the total weight of the ink.

18. The aqueous inkjet ink of claim 10, having a surface tension in the range of about 20 dyne/cm to about 70 dyne/cm at 25°

C., and a viscosity in the range of about 1 cP to about 30 cP at 25°

C.

19. An inkjet ink set for color printing, comprising a cyan, magenta and yellow ink, wherein the cyan ink comprises an aqueous vehicle having dispersed therein (1) a cyan copper phthalocyanine pigment and (2) a polyurethane, provided that:

(i) the cyan copper phthalocyanine pigment is not dispersed in the aqueous vehicle by a sodium aromaticsulfonate-formaldehyde condensate dispersant; and

/or

(ii) the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 2.5.

20. An inkjet ink set for color printing, comprising a cyan, magenta and yellow ink, wherein the cyan ink comprises a mixture of (1) an aqueous vehicle, (2) a cyan copper phthalocyanine pigment and (3) a polyurethane dispersion, such that the pigment and polyurethane are dispersed in the aqueous vehicle, provided that:

(i) the cyan copper phthalocyanine pigment is not dispersed in the aqueous vehicle by a sodium aromaticsulfonate-formaldehyde condensate dispersant; and

/or

(ii) the weight ratio of cyan copper phthalocyanine pigment to polyurethane is less than about 2.5.