Inkjet ink and process for the production thereof

Details Inkjet ink and process for the production thereof Inkjet ink and process for the production thereof

1997-07-25

1999-06-22

Mulcahy, Peter D.

Compositions: coating or plastic

Coating or plastic compositions

Marking

524562, C09D 1100

Patent

active

059139714

ABSTRACT:
An inkjet ink having sufficient water resistance on a recording sheet but having excellent re-solubility in an ink in a head portion and excellent ejection stability through a nozzle, the inkject ink comprising an aqueous liquid, a pigment and a water-soluble resin, the water-soluble resin being a terpolymer obtained from acrylic acid, styrene and .alpha.-methyl styrene and having a weight average molecular weight of 2,000 to 8,000 and an acid value of 90 to 130, and a process for the production of the inkjet ink, which comprises preparing a concentrated aqueous dispersion of a pigment and a terpolymer obtained from acrylic acid, styrene and .alpha.-methylstyrene, adding water and an additive to the concentrated dispersion to dilute the concentrated dispersion and maintaining the diluted dispersion at a temperature between 60.degree. C. and 80.degree. C. for 5 to 48 hours.

REFERENCES:
patent: 5114479 (1992-05-01), Keaveney et al.
patent: 5172133 (1992-12-01), Suga et al.
patent: 5192361 (1993-03-01), Schilling
patent: 5302631 (1994-04-01), Yamada et al.
patent: 5316575 (1994-05-01), Lent et al.

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