Penetrants for aqueous ink jet inks
AssigneeE. I. Du Pont de Nemours and Company
InventorHoward Matrick
Life of this patent
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Abstract
An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a diol penetrant. The latter is an aliphatic diol having at least 6 carbon atoms, a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. and is selected from the group consisting essentially of: (1) compounds wherein at least 2 carbon atoms are attached as substituents to the main chain, and (2) Hexene [1,2-]diols. 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, are storage stable, have reliable performance and give images having good print quality.
Claims36
An aqueous ink jet ink composition comprising:
- (a) an aqueous carrier medium,
- (b) a pigment dispersion or dye;
- and
- (c) an aliphatic diol penetrant compound having at least 6 carbon atoms, a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C., and selected from the group consisting of
- (1) compounds wherein at least 2 carbon atoms are attached as substituents to the main chain and represented by the general formula
- C.sub.n H.sub.2n (OH).sub.2
- wherein n is at least 6;
- and
- (2) Hexene[1,2]diols.
Dependencies are inferred from the claim text.