Binary ink sets

Patent metadata

Field	Value
Publication number	US-9822270-B2
Application number	US-201415118403-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 6, 2014
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The present disclosure provides binary ink sets and related methods. In one example, a binary ink set for printing a non-Newtonian inkjet image can comprise a gelator inkjet ink comprising a gelator in an amount ranging from 0.1% to 10% by weight based on the total weight of the gelator ink and an organic solvent; and a colorant inkjet ink comprising a colorant and an organic solvent. The gelator inkjet ink and the colorant inkjet ink can be configured to form a structured network upon printing where the non-Newtonian inkjet ink has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state, measured at 25° C.

First claim

What is claimed is:

1. A binary ink set, comprising:
a non-Newtonian gelator inkjet ink including an organic solvent and a gelator in an amount ranging from 0.1% to 20% by weight based on the total weight of the gelator ink; and
a colorant inkjet ink comprising a colorant and an organic solvent;
wherein the gelator inkjet ink and the colorant inkjet ink are formulated to form a structured network when contacted, wherein the gelator inkjet ink does not self-assemble into a structured network until mixing with the colorant inkjet ink, and wherein the gelator inkjet ink has a first dynamic viscosity ranging from 25 cps to 10,000 cps when subject to a shear rate of 5 s −1 and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state when subject to a shear rate of 10,000 s −1 , measured at 25° C.

2. The binary ink set of claim 1 , wherein the gelator is a low molecular weight organic gelator.

3. The binary ink set of claim 1 , wherein the gelator is a metal oxide.

4. The binary ink set of claim 1 , wherein the first dynamic viscosity is 100 cps to 1000 cps and the second dynamic viscosity is 1 cps to 25 cps.

5. The binary ink set of claim 1 , wherein
the gelator is a low molecular weight organic gelator selected from the group consisting of amino acids, peptides, cyclic peptides, amino acids having a protecting group, peptides having a protecting group, cyclic peptides having a protecting group, and mixtures thereof; or
the gelator is a metal oxide selected from the group consisting of aluminum oxide, silicon dioxide, zinc oxide, iron oxide, titanium dioxide, indium oxide, zirconium oxide.

6. The binary ink set of claim 1 , wherein
the gelator inkjet ink further comprises a salt present in an amount from 0.05% to 40% by weight based on the total weight of the gelator inkjet ink, or
the colorant inkjet ink further comprises a salt present in an amount from 0.05% to 40% by weight based on the total weight of the colorant inkjet ink; and wherein the salt and the gelator form the structured network.

7. The binary ink set of claim 6 , wherein the gelator is a low molecular weight organic gelator present in an amount ranging from 1% to 5% by weight based on the total weight of the gelator inkjet ink and the salt is present in an amount ranging from 1% to 10% by weight based on the total weight of the gelator or colorant inkjet ink, or wherein the gelator is a metal oxide present in an amount ranging from 1% to 5% by weight based on the total weight of the gelator inkjet ink and the salt is present in an amount ranging from 0.5% to 4% by weight based on the total weight of gelator or colorant inkjet ink.

8. The binary ink set of claim 6 , wherein the gelator is a low molecular weight organic gelator and the low molecular weight organic gelator and the salt are present at a low molecular weight organic gelator to salt ratio ranging from 1:1 to 1:5 by weight; or wherein the gelator is a metal oxide and the metal oxide and the salt are present at a metal oxide to salt ratio ranging from 0.5:1 to 5:1 by weight.

9. The binary ink set of claim 1 , wherein the structured network is free of polymers.

10. The binary ink set of claim 1 , wherein the organic solvent of the gelator inkjet ink and the organic solvent of the colorant inkjet ink is a network participating solvent independently selected from the group consisting of ethylhydroxy-propanediol (EHPD), glycerol, 1,5 pentanediol, ethylene glycol, tritethylene glycol, and mixtures thereof; or the organic solvent is a network non-participating solvent selected from the group consisting of 2-pyrrolidinone, 1,2 pentanediol, 2-methyl-1,3-propanediol (MPDIOL), 1,2 hexanediol, and mixtures thereof.

11. The binary ink set of claim 1 , wherein one or both of the non-Newtonian gelator inkjet ink or the colorant inkjet ink includes a network participating solvent.

12. The binary ink set of claim 1 , wherein the gelator inkjet ink has a first pH ranging from 2 to less than 7 and the colorant inkjet ink has a second pH ranging from greater than 7 to 12, and wherein, upon printing, a resultant non-Newtonian inkjet ink has a third pH ranging from 7 to 10that allows the structured network to form within 2 minutes.

13. The binary ink set of claim 1 , wherein the colorant inkjet ink is a Newtonian inkjet ink.

14. The binary ink set of claim 1 , wherein the colorant inkjet ink is a non-Newtonian inkjet gelator ink.

15. A method of printing a binary ink set to form a non-Newtonian inkjet image, comprising:
inkjet printing a gelator inkjet ink, comprising an organic solvent and a gelator in an amount ranging from 0.1% to 20% by weight based on the total weight of the gelator ink; and
inkjet printing a colorant inkjet ink in contact with the gelator inkjet ink, the colorant inkjet ink, comprising an organic solvent and a colorant,

wherein the gelator inkjet ink and the colorant inkjet ink, upon printing, mix and form a non-Newtonian inkjet image having a structured network, wherein the gelator inkjet ink does not self-assemble into a structured network until mixing with the colorant inkjet ink.

16. The binary ink set of claim 1 , wherein the gelator inkjet ink is devoid of colorant.

Assignees

• Hewlett Packard Development Co Lp

Inventors

• Adamic Raymond
• Kasperchik Vladek

Classifications

• C09D11/40 Primary

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• B41J2/21

  for multi-colour printing · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/324

  containing carbon black · CPC title

• C09D11/36 Primary

  based on non-aqueous solvents · CPC title