Inkjet ink including polyurethane
First Claim
Patent Images
1. An inkjet ink composition, comprising:
- from 0.25 weight percent to 6 weight percent colorant;
from 5 weight percent to 40 weight percent solvent;
from 0.05 weight percent to 5 weight percent surfactant;
polyurethane binder in an amount of at least 0.5 weight percent of the inkjet ink composition but not more than twice the weight percent of the colorant, the polyurethane binder formed from a polyether polyol, an aliphatic isocyanate, and an acid group; and
a balance of water;
wherein the polyurethane binder does not include chain extenders; and
wherein the solvent includes a component solvent selected from the group consisting of 1,3-di(hydroxyethyl)-5,5-dimethylhydantoin, betaine, and combinations thereof.
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Abstract
An inkjet ink composition includes: from 0.25 to 6 weight percent colorant; from 7 to 40 weight percent solvent; from 0.05 to 5 weight percent surfactant; and polyurethane binder in an amount of at least 0.5 weight percent of the inkjet ink composition but not more than twice the weight percent of the colorant. The polyurethane binder has a molecular weight from 32 K to 50 K and an acid number from 40 to 45. The polyurethane binder includes polyether polyol, aliphatic isocyanate and an acid group and does not include chain extenders.
23 Citations
17 Claims
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1. An inkjet ink composition, comprising:
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from 0.25 weight percent to 6 weight percent colorant; from 5 weight percent to 40 weight percent solvent; from 0.05 weight percent to 5 weight percent surfactant; polyurethane binder in an amount of at least 0.5 weight percent of the inkjet ink composition but not more than twice the weight percent of the colorant, the polyurethane binder formed from a polyether polyol, an aliphatic isocyanate, and an acid group; and a balance of water; wherein the polyurethane binder does not include chain extenders; and wherein the solvent includes a component solvent selected from the group consisting of 1,3-di(hydroxyethyl)-5,5-dimethylhydantoin, betaine, and combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An ink set, comprising:
at least one ink selected from the group consisting of black, cyan, magenta and yellow inks, wherein the at least one ink includes; from 0.25 weight percent to 6 weight percent colorant; from 7 weight percent to 40 weight percent solvent; from 0.05 weight percent to 5 weight percent surfactant; polyurethane binder in an amount of at least 0.5 weight percent of the at least one ink but not more than twice the weight percent of the colorant, the polyurethane binder formed from a polyether polyol, an aliphatic isocyanate, and an acid group; and a balance of water; wherein the polyurethane binder in the at least one ink has a number average molecular weight from 32,000 to 50,000 and an acid number from 40 mg-KOH/g composition to 45 mg-KOH/g composition; and wherein the polyurethane binder does not include chain extenders. - View Dependent Claims (9, 11, 12)
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10. An ink set, comprising:
at least one ink selected from the group consisting of black, cyan, magenta and yellow inks, wherein the at least one ink includes; from 0.25 weight percent to 6 weight percent colorant; from 7 weight percent to 40 weight percent solvent; from 0.05 weight percent to 5 weight percent surfactant; polyurethane binder in an amount of at least 0.5 weight percent of the at least one ink but not more than twice the weight percent of the colorant; and a balance of water; wherein; the polyurethane binder in the at least one ink has a number average molecular weight ranging from 32,000 to 50,000 and an acid number ranging from 40 mg-KOH/g composition to 45 mg-KOH/g composition; the polyurethane binder does not include chain extenders; and the polyurethane binder is prepared from polytetramethylene glycol and isophorone diisocyanate.
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13. A method of making an inkjet ink, comprising the steps of:
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combining a di-acid with polytetramethylene glycol to produce a diol; combining the diol with isophorone diisocyanate to produce a polyurethane binder; and combining the polyurethane binder with vehicle, colorant and surfactant to produce the inkjet ink; wherein the ink includes from 0.25 weight percent to 6 weight percent colorant;
from 7 weight percent to 40 weight percent solvent;
from 0.05 weight percent to 5 weight percent surfactant; and
a balance of water;wherein the polyurethane binder is in an amount of at least 0.5 weight percent of the inkjet ink but not more than twice the weight percent of the colorant; and wherein the polyurethane binder does not include chain extenders. - View Dependent Claims (14, 15, 16)
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17. An inkjet ink composition, comprising:
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from 0.25 weight percent to 6 weight percent colorant; from 5 weight percent to 40 weight percent solvent; from 0.05 weight percent to 5 weight percent surfactant; polyurethane binder in an amount of at least 0.5 weight percent of the inkjet ink composition but not more than twice the weight percent of the colorant, the polyurethane binder formed from a polyether polyol, an aliphatic isocyanate, and an acid group; and a balance of water; wherein the polyurethane binder does not include chain extenders; and wherein the polyether polyol is polytetramethylene glycol, the aliphatic isocyanate is isophorone diisocyanate, and the acid group is a di-acid.
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Specification