Formulation for control of paper cockle in thermal ink-jet printing
AssigneeHewlett-Packard Company
InventorsJohn R. Moffatt, Hiang P. Lauw
Life of this patent
Estimating the term…
Abstract
Paper cockle, which results from printing inks having a high water content, is reduced in thermal ink-jet inks by adding abut 15 to 50 wt % of an anti-cockle agent comprising a compound selected from the group consisting of hexaethylene glycol and an organic compound having from four to eight carbon atoms and two or three OH groups. The inks contain the commonly-employed components of water, dye, and a low vapor pressure solvent, in addition to the anti-cockle agents, and may include additional components to control specific properties, such as color bleed, threading, kogation, and the like.
Claims18
An improved thermal ink-jet ink evidencing reduced medium cockle consisting essentially of:
- (a) about 0.5 to 20 wt % of at least one low vapor pressure solvent;
- (b) about 0.5 to 5 wt % of at least one water-soluble dye;
- (c) about 15 to 50 wt % of an anti-cockle agent, based on the total ink composition, said anti-cockle agent comprising a compound selected from the group consisting of hexaethylene glycol and an organic compound having from four to eight carbon atoms and from two to three OH groups;
- and
- (d) water.
A method of reducing medium cockle during thermal ink-jet printing onto said medium, comprising employing a thermal ink-jet ink consisting essentially of
- (a) about 0.5 to 20 wt % of at least one low vapor pressure solvent;
- (b) about 0.5 to 5 wt % of at least one dye;
- (c) about 15 to 50 wt % of an anti-cockle agent, based on the total ink composition, said anti-cockle agent comprising a compound selected from the group consisting of hexaethylene glycol and an organic compound having from four to eight carbon atoms and from two to three OH groups;
- and
- (d) water.
Dependencies are inferred from the claim text.