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Higher organic inks with good reliability and drytime

a technology of organic inks and inkjets, applied in the field of inkjet inks, can solve the problems of not simply achieve the effects of increasing the organic content, controlling viscosity and surface tension, and increasing the organic conten

Inactive Publication Date: 2003-01-30
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] Advantageously, using a higher solvent ink reduces cockle. Cockle is also reduced as the water content of the ink is reduced.
[0011] The present invention uses 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 and reduced cockle and curl with acceptable print quality. Current embodiments have not used higher solvent content inks in their underprinting solutions.

Problems solved by technology

However, it is not simply enough to increase the organic content; other factors must be considered as well.

Method used

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  • Higher organic inks with good reliability and drytime
  • Higher organic inks with good reliability and drytime
  • Higher organic inks with good reliability and drytime

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] Table I below tabulates the curl for three different inks, wherein "Ink 1" has the formulation listed above, "Ink 1+10% 2P" is Ink 1 plus 10 wt % 2-pyrrolidone, and "Control" is commercially available as HP C4844A black ink. Table I shows that the addition of a minimal amount of only 10 wt % 2-pyrrolidone to a basic ink jet formulation greatly improves the expected pen life ("plot suite" is a measure of pen life, wherein the higher the value, the longer the pen life) and stops curl.

1TABLE I # of plot suites in charac-Example 1 teristic life Curl Ink 1 63.8 Severe Ink 1 + 10% 2-P 97.6 None Control 53.7 Some

example 2

[0077] The inks may be underprinted with a fixer. An example of a suitable fixer composition is listed in Table II below.

2TABLE II Composition of Fixer. Ink Ingredients Fixer, wt % 2-pyrrolidone 4 tetraethylene glycol 6 1,5-pentanediol 10 Tergitol 15-S-5 1.25 Bioterge PS-8S 2.0 Calcium nitrate tetrahy-3.5 drate Polyethyleneimine 3.5 (800 MW from Aldrich) pH 4* *adjusted with HNO.sub.3

[0078] The fixer may also contain the anti-cockle / curl additives of the present invention, but the most effective use of these additives is in the high organic ink itself. The precipitation or immobilization of the colorant is also important to drytime, and the fixer combined with the ink precipitates the colorant to give essentially instantaneous drytime on plain papers. Cockle / curl are a separate issue, which can be helped by the addition of these solvents (the removal of water).

[0079] Table III below compares the results of Ink 2 and Ink 2 plus 10 wt % 2-pyrrolidone ("10% 2P"). Specifically, Table II...

example 3

[0081] Table IV below compares the results of Ink 3 alone and with (a) plus 20 wt % 2-pyrrolidone, (b) plus 10 wt % glycerol, and (c) plus 20 wt % glycerol. The same headings as in Table III above are also in Table IV.

[0082] Again, underprinting increases the optical density (OD). Increasing the organic content (e.g., +20 wt % glycerol) negatively impacts drytime without underprinting. But with underprinting, drytime is instantaneous in all cases. Underprinting also eliminates bleed even at high total organic content. Curl improves when the high organic content (2-pyrrolidone or glycerol in this example) is added and the fixer eliminates any negative impacts to drytime, bleed, and strikethrough.

[0083] The addition of high organic solvents also improves pen life from reduced outgassing as shown in Table I.

4TABLE IV Comparison of Ink 3 without and with Increased Organic Solvent. Ave. OD on Ave. OD Drytime Drytime Bleed with CDCY curl % strike five plain with un- on with under-Bleed on...

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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.

Description

[0001] The present invention relates to inkjet printing, and, more particularly, to reducing outgassing of the ink caused by the die in the pen used in inkjet printing.[0002] Inkjet printing is a well-established technology, involving jetting ink either thermally, via use of a heated element that expels bubbles of ink from a firing chamber upon controlled activation, or mechanically, via use of a piezoelectric transducer that expels bubbles of ink from a chamber upon controlled activation.[0003] The composition of the inks employed in ink-jet printing has undergone considerable modification, in an effort to improve properties related to the jetting operation as well as to improve the properties of the printed ink.[0004] Commercially-available inkjet inks have a high water content for printing on plain paper, typically on the order of 70 wt % or more water. These inks generally print well on plain paper. However, high water content ink has the disadvantage of degassing in the pen and...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/00
CPCC09D11/30
Inventor STOFFEL, JOHN L.KELLY-ROWLEY, ANNE M.PRASAD, KESHAVA A.
Owner HEWLETT PACKARD DEV CO LP
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