Aqueous ink for ink-jet printing
US4620876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1985 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | Oct 24, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S534/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous ink for ink-jet printing comprising at least a water-soluble dye, a water-soluble organic solvent, a water-soluble preservative and anti-mold agent, and water, wherein PA0 (1) the water-soluble dye is a mixture of dye compounds I and II and/or III, the peak ratio of I/II and/or III of the water-soluble dye measured by liquid chromatography is in the range of 0.9 to 3.0; the total concentration of NaCl and Na.sub.2 SO.sub.4 contained in the water-soluble dye is 3.0 wt. % or less; and the concentration of Ca contained therein is 120 ppm or less; PA0 (2) the water-soluble organic solvent is a mixture consisting essentially of glycerin and at least one glycol selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol, with the content ratio of (the glycerin:the glycol) being in the range of (1:1) to (1:5) in terms of parts by weight, and the concentration of the water-soluble organic solvent in the aqueous ink is in the range of 10 wt. % to 30 wt. %; and PA0 (3) the surface tension of said aqueous ink is 50 dynes/cm or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.