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Aqueous ink jet inks containing ester diol and amide diol cosolvents
| Details |
Inventors: Matrick, Howard;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Dixon, Jr.; William R.
Assistant Examiner: Einsmann; Margaret V.
Attorney, Agent or Firm:
An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and an amide diol or ester diol cosolvent penetrant such as hydroxypivalyl hydroxypivalate. The cosolvent penetrant has a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. The pigment dispersion consists of pigment particles and a dispersant, preferably a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit rapid drying, have excellent decap performance, are storage stable and give images having good print quality. |
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DETAILED DESCRIPTION OF THE INVENTION The invention relates to an ink jet ink composition which is particularly suited for use in ink jet printers in general, and thermal ink jet printers in particular.
The ink jet ink composition encompasses both pigment-based inks and dye-based inks.
The pigmented inks comprise an aqueous carrier medium, an ester diol or amide diol cosolvent and a pigment dispersion which is an aqueous dispersion of pigment particles, stabilized by dispersants, usually polymeric, that are stable over long periods, both in storage and in the printer.
The dye-based inks comprise an aqueous carrier medium, a dye and an ester diol or amide diol cosolvent.
The inks may be adapted to the requirements of a particular ink jet printer to provide a balance of light stability, smear resistance, viscosity, surface tension, high optical density, and crust resistance.
The aqueous carrier comprises water or a mixture of water and an organic water soluble compound other than the ester diol or amide diol compound.
A major advantage of using the cosolvents described in this invention is their compatibility with pigment dispersions.
However, the cosolvents can also be used in dye-based inks to impart rapid penetration of aqueous dye-based inks into the paper.
ESTER DIOL OR AMIDE DIOL COSOLVENT OR PENETRANTS The compounds of this invention fill a need for pigmented ink jet inks with good dispersion stability in the presence of a cosolvent that imparts both rapid media penetration and long decap performance.
The ester diol or amide diol compounds of the invention have a solubility in water of at least 4.
5 parts in 100 parts of water at 25.
degree.
C.
and are represented by the formula: ##STR2## wherein R'=--CH.
sub.
3, --C.
sub.
2 H.
sub.
5 , --C.
sub.
3 H.
sub.
7, or --C.
sub.
4 H.
sub.
9 and R"=--CH.
sub.
3, --C.
sub.
2 H.
sub.
5, or --C.
sub.
3 H.
sub.
7 and X=O for an ester diol or N--Y for an amide diol wherein Y=H, CH.
sub.
3, CH.
sub.
2 CH.
sub.
3 or CH.
sub.
2 CH.
sub.
2 OH.
Preferred are ester diols, and more specifically hydroxypivalyl hydroxypivalate also known as neopentyl glycol hydroxypivalate and is represented by the formula: ##STR3## DISPERSANTS The pigment dispersion comprises a pigment and usually a dispersant
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