Ink-jet ink for plain paper printing
AssigneeHewlett-Packard Company
InventorsJames G. Bearss, Kenneth A. Norton
Life of this patent
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Abstract
An ink composition is provided for an ink-jet printer, preferably a thermal ink-jet printer. The composition comprises about 5 to 40 wt % glycol, about 60 to 90 wt % water, about 0.001 to 10 wt % polymer blend and about 1 to 7 wt % dye. The polymer blend includes both uncharged and charged monomeric units. The glycol and polymer blend act to form a soft plug that forms in the orifice of the ink-jet pen. The soft plug prevents further evaporaion of water, but unlike a hard plug, is readily blown out upon firing. The charged units in the polymer blend contribute to water fastness and light fastness of the dye on paper. Further, by employing appropriate functional groups in the polymer blend, chemical degradation of the ink dye can be retarded on acid or alkaline papers.
Claims8
An ink-jet composition comprising:
- glycol 5-40 wt. %
- water 60-90 wt. %
- polymer blend 0.001-10 wt. %
- dye 1-7 wt. %
- wherein said polymer blend comprises polyvinyl pyrrolidone/polyvinyl acetate copolymer, ranging in ratio from about 60/40 to 90/10 PVP/PVA or polyvinyl pyrrolidone/polyvinyldimethylaminoethylmethacrylate copolymer, ranging in ratio from about 60/40 to 90/10 PVP/polyvinyldimethylaminoethylmethacrylate.
Dependencies are inferred from the claim text.