Ink for ink-jet recording and ink-jet recording process using the same
AssigneeCanon Kabushiki Kaisha
InventorsShoji Koike, Yasuko Tomida
Life of this patent
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Abstract
An ink for ink-jet recording is provided which comprises a liquid composition essentially comprised of a coloring matter, a volatile solvent having a vapor pressure of 1 mmHg or more at 25.degree. C., and a material being solid at room temperature and having a molecular weight of 300 or more; and prepared so as to satisfy formula B.sub.1 /A.sub.1 .gtoreq.3, assuming viscosity as A.sub.1 cP at 25.degree. C. measured when the content of the solid material in said composition is 10% by weight, and assuming viscosity as B.sub.1 cP at 25.degree. C. measured when the content of the solid material in said composition is 30% by weight. An ink-jet recording process employing the above mentioned ink is also provided.
Claims26
A liquid ink-jet recording ink, comprising a water-soluble dye, from 60-95 wt. % of a volatile solvent having a vapor pressure of 1mmHg or more at 25.degree. C. and from 5-35 wt. % of a water-miscible material which is solid at room temperature and has a molecular weight of at least 300, said material being selected from the group consisting of polyethylene glycol, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and polyoxyethylene/polyoxypropylene block polymer, where said recording ink satisfies formula (I) shown below, assuming viscosity as A.sub.1 cP at 25.degree. C. measured when the content of the solid material in said composition is 10% by weight, and assuming viscosity as B.sub.1 cP at 25.degree. C. measured when the content of the solid material in said composition is 30% by weight:
- B.sub.1 /A.sub.1 .gtoreq.3 (I).
A liquid ink-jet recording ink, comprising a water-soluble dye, from 60-95 wt. % of a volatile solvent having a vapor pressure of 1 mmHg or more at 25.degree. C., a low-viscosity solvent having a vapor pressure of less than 1 mmHg and a viscosity of 10 cP or less at 25.degree. C., and from 5-35 wt. % of a water-miscible material which is solid at room temperature and has a molecular weight of at least 300, said material being selected from the group consisting of polyethleneglycol, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and polyoxyethylene/polyoxypropylene block polymer, wherein said recording ink satisfies formula (II) shown below, assuming viscosity as A.sub.2 cP at 25.degree. C. measured when the content of the solid material in said composition is 10% by weight, and assuming viscosity as B.sub.2 cP at 25.degree. C. measured when the content of the solid material in said composition is 30% by weight:
- B/A.gtoreq.3 (II).
A liquid ink-jet recording ink, comprising a water soluble dye, from 60-95 wt. % of a volatile solvent having a vapor pressure of 1 mmHg or more at 25.degree. C. and from 5-35 wt. % of a water-miscible material which is solid at room temperature and has a molecular weight of at least 300, said material being selected from the group consisting of polyethylene glycol, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and polyoxyethylene/polyoxypropylene block polymer.
A liquid ink-jet recording ink, comprising a water-soluble dye, from 60-95 wt. % of a volatile solvent having a vapor pressure of 1 mmHg or more at 25.degree. C., a low-viscosity solvent having a vapor pressure of less than 1mmHg and a viscosity of 10 cP or less at 25.degree. C., and from 5-35 wt. % of a water-miscible material which is solid at room temperature and has a molecular weight of at least 300, said material being selected from the group consisting of polyethylene glycol, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and polyoxyethylene/polyoxypropylene block polymer.
Dependencies are inferred from the claim text.