INKJET INKS HAVING ANTI-ABRASION POLYMERS AND ANTI-ABRASION AIDS

• US 20090167824A1
• Filed: 09/22/2008
• Published: 07/02/2009
• Est. Priority Date: 12/27/2007
• Status: Active Grant

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Madigan, Paul J., Szajewski, Richard P.
• Granted Patent: US 8,066,364 B2
• Time in Patent Office: Days
• US Class Current: 347/84
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/44 Polycarbonates
• CPC Class Codes: C08G 18/6659 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/20 Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/40 Ink-sets specially adapted for multi-colour inkjet printing

Abstract

An aqueous inkjet ink is described comprising water, a charge stabilized anti-abrasion polymer provided as a hydrophobic colloidal sol, a water-soluble humectant and a polyethyleneglycol-diether compound of Formula I as an anti-abrasion aid:

R₁—(OCH₂CH₂)_nO—R₂   (I)

where R₁ and R₂ can be the same or different and are individually alkyl with 1 to 4 carbons, or phenyl, and n is between 2 and 45. Also described is a related aqueous inkjet ink-set and an image forming method having the step of imagewise applying by jetting to a receiver, one or more aqueous inks, as above described.

Claims

1. An aqueous inkjet ink comprising water, a charge stabilized anti-abrasion polymer provided as a hydrophobic colloidal sol, a water-soluble humectant, and a polyethyleneglycol-diether compound of Formula I as an anti-abrasion aid:

R₁—

(OCH₂CH₂)_nO—

R₂  

 

(I)

where R₁ and R₂ can be the same or different and are individually alkyl with 1 to 4 carbons, or phenyl, and n is between 2 and 45.

2. The ink of claim 1 wherein said anti-abrasion aid is a polyethylene glycol dimethyl ether having Mn between 160 and 2000.

3. The ink of claim 1 further comprising a colorant.

4. The ink of claim 3 wherein said colorant comprises a polymeric dispersed pigment colorant, a self-dispersed pigment, or a surfactant dispersed pigment.

5. The ink of claim 4 wherein said colorant comprises a pigment colorant dispersed with a polymeric dispersant formed from hydrophobic and hydrophilic monomers, wherein said hydrophobic monomers comprise benzyl methacrylate or acrylate, or methacrylic or acrylic acid esters containing an aliphatic chain having twelve or more carbons, and said hydrophilic monomers comprise carboxylated monomers.

6. The ink of claim 1 wherein said anti-abrasion polymer has a weight average molecular weight between 6,000 and 60,000.

7. The ink of claim 1 wherein said anti-abrasion polymer has a charge number between 30 and 180.

8. The ink of claim 1 wherein said anti-abrasion polymer is present at between 0.05 and 5 percent by weight.

9. The ink of claim 1 wherein said anti-abrasion polymer has a Tg of between 20 and 180°

C.

10. The ink of claim 1 wherein said anti-abrasion polymer is a polyurethane.

11. The ink according to claim 10 wherein said polyurethane has an acid number between 60 and 100 and a weight average molecular weight greater than 10,000 and said ink has a pH between 7 and 10.

12. The ink of claim 11, further comprising a pigment colorant.

13. The ink of claim 12 wherein said colorant comprises a polymeric dispersed pigment colorant.

14. The ink of claim 1 wherein said anti-abrasion aid is present at between 0.1 and 8 percent by weight.

15. The ink of claim 1 wherein said anti-abrasion aid has a number average molecular weight between 100 and 2500.

16. The ink of claim 1 comprising one or more humectants present at between 3 and 45 percent by total weight.

17. An aqueous inkjet ink-set comprising at least two distinctly formulated inks, wherein at least one of said inks comprises a charge stabilized anti-abrasion polymer provided as a hydrophobic colloidal sol;

at least one of said inks comprises a polyethyleneglycol-diether compound of formula I as an anti-abrasion aid;

R₁—

(OCH₂CH₂)_nO—

R₂  

 

(I)

where R₁ and R₂ can be the same or different and are individually alkyl with 1 to 4 carbons, or phenyl, and n is between 2 and 45; and

at least one of said inks comprises a pigment colorant.

18. An aqueous inkjet ink-set according to claim 17, wherein at least one of said inks comprises a colored pigmented inkjet ink and at least one of said inks comprises an uncolored protective inkjet ink.

19. An image forming method comprising the step of imagewise applying one or more aqueous inks by jetting to a receiver, wherein said one or more inks cumulatively comprise water, a humectant, a charge stabilized anti-abrasion polymer provided as a hydrophobic colloidal sol, and a polyethyleneglycol-diether compound of formula I as an anti-abrasion aid:

R₁—

(OCH₂CH₂)_nO—

R₂  

 

(I)

where R₁ and R₂ can be the same or different and are individually alkyl with 1 to 4 carbons, or phenyl, and n is between 2 and 45;

wherein said one or more inks are applied so as to mix at a common loci of said receiver.

20. The method of claim 19 wherein at least one of said inks further comprises a colorant.