Ink composition
First Claim
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1. An ink composition, comprising:
- a colorant;
a co-solvent;
a surfactant system, consisting of;
an acid selected from the group consisting of undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof;
lithium; and
a non-ionic surfactant including a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system, the non-ionic surfactant excluding any ethyleneoxy groups; and
water;
wherein the ink composition excludes stearic acid, linolenic acid, linear saturated fatty acids having a carbon chain of fewer than 11 carbons, and linear saturated fatty acids having a carbon chain of more than 13 carbons.
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Abstract
An ink composition includes a colorant, a co-solvent, a surfactant system, and water. The surfactant system consists of an acid, lithium, and a non-ionic surfactant. The acid is selected from the group consisting of oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof. The non-ionic surfactant includes a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system. The non-ionic surfactant also excludes any ethyleneoxy groups.
47 Citations
17 Claims
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1. An ink composition, comprising:
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a colorant; a co-solvent; a surfactant system, consisting of; an acid selected from the group consisting of undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof; lithium; and a non-ionic surfactant including a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system, the non-ionic surfactant excluding any ethyleneoxy groups; and water; wherein the ink composition excludes stearic acid, linolenic acid, linear saturated fatty acids having a carbon chain of fewer than 11 carbons, and linear saturated fatty acids having a carbon chain of more than 13 carbons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A print cartridge, comprising:
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a fluid reservoir; a fluid ejector in fluid communication with the fluid reservoir; a nozzle in fluid communication with the fluid ejector; an ink composition present in the fluid reservoir, the ink composition including; a colorant; a co-solvent; a surfactant system, consisting of; an acid selected from the group consisting of undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof; lithium; and a non-ionic surfactant including a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system, the non-ionic surfactant excluding any ethyleneoxy groups; and water; wherein the ink composition excludes stearic acid, linolenic acid, linear saturated fatty acids having a carbon chain of fewer than 11 carbons, and linear saturated fatty acids having a carbon chain of more than 13 carbons; the anti-evaporative layer present at an interface between air and the ink composition in an orifice of the nozzle, the anti-evaporative layer formed during uncapped non-use, thereby reducing evaporation of the water from the ink composition. - View Dependent Claims (14)
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15. A method for improving decap of an ink composition, the method comprising:
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selecting a surfactant system, consisting of; an acid selected from the group consisting of undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof; lithium; and a non-ionic surfactant including a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system, the non-ionic surfactant excluding any ethyleneoxy groups; and incorporating the selected surfactant system into a mixture to form the ink composition, the mixture including; a colorant; a co-solvent; and water; wherein the ink composition excludes stearic acid, linolenic acid, linear saturated fatty acids having a carbon chain of fewer than 11 carbons, and linear saturated fatty acids having a carbon chain of more than 13 carbons.
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16. An ink composition, comprising:
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a colorant; a co-solvent; a surfactant system, consisting of; an acid selected from the group consisting of oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof; lithium; and a non-ionic surfactant including a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system, the non-ionic surfactant excluding any ethyleneoxy groups, wherein the non-ionic surfactant comprises bis-tartrate esters selected from the group consisting of dibutyl tartrate, dibenzyl tartrate, and diisopropyl tartrate; and water. - View Dependent Claims (17)
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Specification