Higher organic inks with good reliability and drytime
First Claim
1. In combination, an inkjet ink composition fixed by a fixer composition on a print medium, wherein each composition comprises a vehicle of the same or different composition and, in the case of said inkjet ink composition, additionally comprises at least one colorant, wherein said vehicle comprises at least one water-miscible organic co-solvent and water, wherein at least said inkjet ink composition contains from about 20 to 40 wt % of organic co-solvents, including at least one “
- high organic”
co-solvent selected from the group consisting of(a)
where R1, R2, and R3 are independently H or CH3 and where X, Y, and Z are independently H, OH or (CH2)nOH, where n=1 to 3; and
(b)
where A=CH2 or NH, said high organic co-solvent being present in an amount of at least 10 wt %.
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Abstract
An inkjet ink is provided that has a greater organic content than prior art inks. However, it is not simply enough to increase the organic content; other factors must be considered as well. These include controlling viscosity and surface tension, as well as maintaining acceptable drytime. An inkjet ink composition that evidences reduced outgassing and reduces paper cockle and curl comprises about 25 to 50 wt % of one or more organic co-solvents, has a viscosity of 10 cp or less, and has a surface tension of 40 dyne/cm or less. Advantageously, using a higher solvent ink reduces cockle and curl. Cockle and curl are also reduced as the water content of the ink is reduced. The present invention uses the higher solvent inks in combination with underprinting. In underprinting, a fixer solution is first “printed” on the print medium, followed by printing the inkjet ink thereon. There is a synergism to this combination. Together, weaknesses of both approaches are addressed. The advantages are a longer life pen, due to the reduction of outgassing of the ink, and reduced cockle and curl.
72 Citations
14 Claims
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1. In combination, an inkjet ink composition fixed by a fixer composition on a print medium, wherein each composition comprises a vehicle of the same or different composition and, in the case of said inkjet ink composition, additionally comprises at least one colorant, wherein said vehicle comprises at least one water-miscible organic co-solvent and water, wherein at least said inkjet ink composition contains from about 20 to 40 wt % of organic co-solvents, including at least one “
- high organic”
co-solvent selected from the group consisting of(a)
where R1, R2, and R3 are independently H or CH3 and where X, Y, and Z are independently H, OH or (CH2)nOH, where n=1 to 3; and
(b)
where A=CH2 or NH,said high organic co-solvent being present in an amount of at least 10 wt %. - View Dependent Claims (2, 3, 4, 5, 6)
- high organic”
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7. A method for reducing die outgassing of a pen used in printing ink on a print medium printed in an inkjet printer, said method comprising:
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(1) providing a fixer composition for printing on said print media in said printer, said fixer composition containing from about 10 to 40 wt % of organic co-solvents;
(2) printing said fixer composition on said print media where printing is desired;
(3) providing an inkjet ink composition for printing on said print media in said printer, said inkjet ink composition containing from about 20 to 40 wt % of at least one co-solvent, wherein said at least one co-solvent includes at least one member independently selected from the group consisting of (a)
where R1, R2, and R3 are independently H or CH3 and where X, Y, and Z are independently H, OH or (CH2)nOH, where n=1 to 3; and
(b)
where A=CH2 or NH,said high organic co-solvent being present in an amount of at least 10 wt %; and (4) printing said inkjet ink on said print media on top of said fixer composition. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
(a) - where R1, R2, and R3 are independently H or CH3 and where X, Y, and Z are independently H, OH or (CH2)nOH, where n =1 to 3; and
(b)
where A=CH2 or NH,said high organic co-solvent being present in an amount of at least 10 wt %.
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12. The method of claim 11 wherein said high organic co-solvent is selected from the group consisting of ethylhydroxypropanediol, 3-methyl-1,3,5-pentanetriol, glycerol, 1,6-hexanediol, 2-pyrrolidone, and 2-imidazolidone.
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13. The method of claim 7 wherein said print medium is optionally heated, either during printing or subsequent thereto, to drive off co-solvent.
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14. The method of claim 7 wherein said at least one colorant is carbon black.
Specification
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- Resources
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Current AssigneeHewlett-Packard Development Company, L.P. (HP Inc.)
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Original AssigneeHewlett-Packard Company (HP Inc.)
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InventorsStoffel, John L., Prasad, Keshava A., Kelly-Rowley, Anne M.
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Primary Examiner(s)Barlow, John
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Assistant Examiner(s)Shah, Manish S.
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Application NumberUS09/844,867Publication NumberTime in Patent Office606 DaysField of Search347/105, 347/100, 347/101, 347/96, 428/195US Class Current347/100CPC Class CodesC09D 11/30 Inkjet printing inks
