INKJET INK WITH SELF DISPERSED PIGMENTS AND POLYURETHANE INK ADDITIVES

• US 20110039028A1
• Filed: 05/22/2009
• Published: 02/17/2011
• Est. Priority Date: 05/23/2008
• 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: Anton, Waifong Liew, Roberts, C. Chad, Mcintyre, Patrick F., Wolfe, Michael Stephen, Spinelli, Harry Joseph
• Application Number:
  US12/989,079
• Publication Number:
  US 20110039028A1
• Time in Patent Office: Days
• US Class Current: 427/256
• 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 18/2865 Compounds having only one primary or secondary amino group; Ammonia
• CPC Class Codes: C08G 18/3212 containing cycloaliphatic groups
• CPC Class Codes: C08G 18/4854 Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
• CPC Class Codes: C08G 18/6692 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: C08G 18/7642 containing at least two isocyanate or isothiocyanate groups linked to the aromatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate groups, e.g. xylylene diisocyanate or homologues substituted on the aromatic ring
• CPC Class Codes: C09D 11/322 Pigment inks

Abstract

The invention provides an ink for inkjet printing, comprising a self-dispersing pigment colorant and certain urea terminated polyurethanes derived from alpha-omega diols and/or polyetherdiols which enhances print quality especially gloss and distinctness of image without compromising jetting performance.

Claims

1. An aqueous inkjet ink composition comprising:

(a) a self dispersed pigment;

(b) an aqueous vehicle; and

(c) urea terminated polyurethanes derived from alpha-omega diols and/or polyether diols comprising at least one compound of general Structure (I)

2. The ink jet ink of claim 1, wherein the urea terminated polyurethanes comprises the diol Structure (II), wherein p is 1, and wherein m is 3 to 30.

3. The ink jet ink of claim 1, wherein the urea terminated polyurethanes comprises the diol of Structure (II), where p is 2 or greater, and wherein m is 3 to 12.

4. The ink jet ink of claim 1, wherein the urea terminated polyurethanes is from about 0.1 to about 12%, by weight based on the weight of the total ink composition.

5. The ink jet ink of claim 1, wherein the urea terminated polyurethanes is from about 0.2 to about 10% by weight based on the weight of the total ink composition.

6. The ink jet ink of claim 1, wherein the urea terminated polyurethanes is from about 0.25 to about 8% by weight based on the weight of the total ink composition.

7. The ink jet ink of claim 1, wherein the urea terminated polyurethanes has a urea content of the urea terminated polyurethanes ink additive is at least 2.5 wt % of the polyurethane and at most 10.5 wt. %.

8. The ink jet ink of claim 1, having from about 0.1 to about 10 wt % pigment based on the total weight of the ink, a surface tension in the range of about 20 dyne/cm to about 70 dyne/cm at 25°

C., and a viscosity of lower than about 30 cP at 25°

C.

9. The ink jet ink of claim 1, wherein the aqueous vehicle is a mixture of water and at least one water-miscible solvent.

10. The ink jet ink of claim 1, where the self dispersed pigment comprises anionic dispersing groups.

11. The ink jet ink of claim 10, where the self dispersed pigment comprises a degree of functionalization of less than about 3.5 μ

moles per square meter of pigment surface (3.5 μ

mol/m2).

12. The ink jet ink of claim 11, wherein the self dispersed pigment comprises a degree of functionalization of less than about 3.0 μ

moles per square meter of pigment surface (3.0 μ

mol/m2).

13. An inkjet ink set wherein at least one of the inks in the set is an ink of claim 1.

14. A method of inkjet printing comprising jetting an ink onto a substrate, wherein the ink is the aqueous ink of claim 1 or the ink set of claim 13.

15. The ink jet ink of claim 1, wherein the urea terminated polyurethanes has an acid number (mg KOH per gram solid polymer) of at least about 10 and at most about 90.