Water-based pigment-type ink and ink jet printer

Compositions: coating or plastic – Coating or plastic compositions – Marking

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106 3164, C09D 1102

Patent

active

060304405

ABSTRACT:
A water-based pigment-type ink containing at least water, a pigment and a dispersant, the pigment particles having an average particle diameter of not larger than 0.1 .mu.m, the weight ratio of the pigment to the dispersant being from 1.2 to 5. The water-based pigment-type ink exhibits more excellent color tone and chroma, by adding the fluorescent pigment in an amount of from 0.1% by weight to 3% by weight with respect to the amount of the ink. Furthermore, the water-based pigment-type ink comprises at least a pigment, a high-molecular dispersant, a surfactant and water, the pigment particles having an average particle diameter of not larger than 80 nm, a maximum particle diameter not being larger than 0.1 .mu.m, the high-molecular dispersant being added in an amount of from 3% by weight to 20% by weight with respect to the amount of the ink, and the surfactant being added in an amount of from 2% by weight to 4% by weight with respect to the amount of the ink.

REFERENCES:
patent: 3615749 (1971-10-01), Cramer et al.
patent: 3928226 (1975-12-01), McDonough et al.
patent: 5690721 (1997-11-01), Itoh
patent: 5736606 (1998-04-01), Yanagi et al.
patent: 5803958 (1998-09-01), Katsen et al.
Patent Abstracts of Japan, C-1104, vol. 17, No. 478, Aug. 31, 1993 & JPA 5 117569, May 14, 1993.
Patent Abstracts of Japan, C-229, vol. 8, No. 130, Jun. 16, 1984 & JPA 59 43076, Mar. 9, 1984.
Patent Abstracts of Japan, C-872, vol. 15, No. 388, Oct. 2, 1991 & JPA 3 157464, Jul. 5, 1991.

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