Inkjet inks containing crosslinked polyurethanes

• US 8,186,822 B2
• Filed: 05/08/2009
• Issued: 05/29/2012
• Est. Priority Date: 05/08/2008
• Status: Active Grant

• Current Assignee: DuPont Electronics, Inc. (DuPont de Nemours, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Li, Xiaoqing, Berge, Charles T.
• Primary Examiner(s): JACKSON, JUANITA DIONNE
• Application Number:
  US12/933,735
• Publication Number:
  US 20110018928A1
• Time in Patent Office: 1,117 Days
• Field of Search: 347/20, 347/56, 347/95, 347/100, 106/31.13, 106/31.6, 106/31.27, 523/160, 523/161
• US Class Current: 347/100
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: D06P 1/5285 Polyurethanes; Polyurea; Polyguanides
• CPC Class Codes: D06P 5/30 Ink jet printing

Abstract

Inkjet inks that have, as a principal component, a crosslinked polyurethane dispersoid binder additive with selected diols used to prepare the polyurethane. The diols include a polyether diol, an ionic diol and polycarbonate, polyamide and/or poly(meth)acrylate diols. These inks can be used for printing on different media, and are particularly suitable for printing on textiles. The printed textiles are particularly durable to wash fastness and crock.

Claims

1. An inkjet ink composition comprising an aqueous vehicle having a colorant and a first crosslinked polyurethane dispersoid, wherein the ink comprises the crosslinked polyurethane dispersoid in an amount of more than about 0.5% to about 30% by weight, based on the total weight of the ink, and wherein the amount of crosslinking in the crosslinked polyurethane is greater than about 1% and less than about 50 wt % as measured by the THF insolubles test and where the crosslinked polyurethane is formed from at least a first diol, Z₁ a second diol, Z₂ and a third diol Z₃ and where

2. The inkjet ink composition of claim 1, having a surface tension in the range of about 20 dyne/cm to about 70 dyne/cm, and a viscosity in the range of about 1 cP to about 30 cP at 25°

C.

3. The inkjet ink composition of claim 1, wherein the colorant comprises a pigment.

4. The inkjet ink composition of claim 1, wherein the first crosslinked polyurethane comprises diols Z₁ Z₂ and Z₃ and Z₃ is a polycarbonate diol.

5. The inkjet composition of claim 1, wherein the first crosslinked polyurethane is formed from diols Z₁, Z₂ and Z₃ and the mole ratio of diols Z₁, and Z₃ is about 1:

1 to about 1;

10.

6. The inkjet composition of claim 1, wherein the first crosslinked polyurethane is formed from diols Z₁, Z₂ and Z₃ and the mole ratio of diols Z₁, and Z₃ is about 1:

1.5 to about 1;

7.

8. A method for inkjet printing onto a substrate, comprising the steps of:

(a) providing an inkjet printer that is responsive to digital data signals;

(b) loading the printer with a substrate to be printed;

(c) loading the printer with an ink as set forth in any one of claims 1 and 2; and

(d) printing onto the substrate using the ink or inkjet ink set in response to the digital data signals.

9. The method of claim 8, wherein the substrate is a textile.

10. The method of claim 9, wherein the printed substrate is post treated with a combination of heat and pressure.

11. The inkjet ink composition of claim 2, having a surface tension in the range of about 20 dyne/cm to about 70 dyne/cm, and a viscosity is in the range of about 1 cP to about 30 cP at 25°

C.

12. The inkjet ink composition of claim 2, wherein the colorant comprises a pigment.

13. The inkjet ink composition of claim 2, wherein the third crosslinked polyurethane is formed from diols Z₂ and Z₃ and Z₃ is a polycarbonate diol.

14. The inkjet composition of claim 2, wherein the second and third crosslinked polyurethanes are formed from diols Z₁ and, Z₂ and Z₂ and Z₃ respectively and the mole ratio of diols Z₁, and Z₃ is about 1:

1 to about 1;

10.

15. The inkjet composition of claim 2, wherein the second and third crosslinked polyurethanes are formed from diols Z₁ and Z₂ and Z₂ and Z₃ respectively and the mole ratio of diols Z₁, and Z₃ is about 1:

1.5 to about 1;

7.

7. An inkjet ink composition comprising an aqueous vehicle having a colorant and a second crosslinked polyurethane dispersoid and a third crosslinked polyurethane dispersoid, wherein the ink comprises the second crosslinked polyurethane dispersoid in an amount of more than about 0.25% to about 30% by weight based on the total weight of the ink, and the third crosslinked polyurethane dispersoid in an amount of more than about 0.5% to about 30% by weight based on the total weight of the ink wherein the amount of crosslinking in the second crosslinked polyurethane is greater than about 1% and less than about 50 wt % as measured by the THF insolubles test and the amount of crosslinking in the third crosslinked polyurethane is greater than about 1% and less than about 50 wt % as measured by the THF insolubles test where the second crosslinked polyurethane is formed from at least a first diol, Z₁ and a second diol, Z₂ and the third crosslinked polyurethane is formed from at least a second diol, Z₂ and a third diol, Z₃ and

where