Pigmented inks and a method of making pigmented inks
First Claim
Patent Images
1. An ink jet ink comprising:
- a) water;
b) pigment;
c) water miscible organic solvent;
d) high-boiling water miscible organic solvent;
e) optionally, a biocide; and
f) optionally a photoinitiator;
wherein said ink does not contain ethylene glycol or diethylene glycol;
wherein the concentration of the water miscible organic solvent and the high boiling water miscible organic solvent together is from about 20% to about 50% by weight, based upon the total weight of the ink;
wherein the surface tension of the ink is from 30 to 74 dyne-cm;
wherein the liquid conductivity of the ink is less than about 5 milli-mhos;
wherein the pigment has a nominal particle size of less than about 0.2 microns; and
wherein the ink has a pH of from about 7 to about 10.
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Abstract
A method of making an ink jet ink that entails combining a water miscible organic solvent, water, and a pigment dispersion, and blending the water miscible organic solvent, the water, and the pigment dispersion together to form the ink jet ink, wherein the ink jet ink is capable of exhibiting no pigment precipitation, no pigment agglomeration, and no pigment flocculation after being stored in the absence of any agitation for a period of at least about 1 month.
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Citations
14 Claims
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1. An ink jet ink comprising:
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a) water;
b) pigment;
c) water miscible organic solvent;
d) high-boiling water miscible organic solvent;
e) optionally, a biocide; and
f) optionally a photoinitiator;
wherein said ink does not contain ethylene glycol or diethylene glycol;
wherein the concentration of the water miscible organic solvent and the high boiling water miscible organic solvent together is from about 20% to about 50% by weight, based upon the total weight of the ink;
wherein the surface tension of the ink is from 30 to 74 dyne-cm;
wherein the liquid conductivity of the ink is less than about 5 milli-mhos;
wherein the pigment has a nominal particle size of less than about 0.2 microns; and
wherein the ink has a pH of from about 7 to about 10. - View Dependent Claims (2, 4, 5, 6)
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3. An ink as claimed in claim wherein the water miscible organic solvent is selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, isobutanol, n-pentanol, dimethylformamide, dimethylacetamide and combinations of the foregoing, and wherein the high boiling water miscible organic solvent is selected from the group consisting of polyethylene glycol, glycerine, glycol ethers, cyclic amines, and combinations of the foregoing.
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7. A method of manufacturing an inkjet ink comprising combining (i) water, (ii) pigment, (iii) water miscible organic solvent and (iv) high-boiling water miscible organic solvent;
- wherein said ink does not contain ethylene glycol or diethylene glycol;
wherein the concentration of the water miscible organic solvent and the high-boiling water miscible organic solvent together is from about 20% to about 50% by weight, based upon the total weight of the ink;
wherein the surface tension of the ink is from 30 to 74 dyne-cm;
wherein the liquid conductivity of the ink is less than about 5 milli-mhos;
wherein the pigment has a nominal particle size of less than about 0.2 microns;
wherein the ink has a pH of from about 7 to about 10 and wherein the ink is subjected to ultrasonic mixing using ultrasonic energy. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
- wherein said ink does not contain ethylene glycol or diethylene glycol;
Specification