Process of making aqueous pigmented ink-jet ink with improved ma

Details Process of making aqueous pigmented ink-jet ink with improved ma Process of making aqueous pigmented ink-jet ink with improved ma

1994-08-23

1996-04-30

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 20C, 106 20D, C09D 1102

Patent

active

055120890

ABSTRACT:
An ink jet ink composition comprises a liquid vehicle, a pigment, and a base for raising the pH of the system. The problem to be addressed for pigmented inks is how to achieve excellent ink redispersibility within a short time period, usually within 1-2 minutes, without any mechanical agitation. With the present invention, dried ink redispersibility/charge plate deposit redispersibility of aqueous pigmented ink is improved by raising the pH of the ink, for example, between 9 and 12. The time required for dried ink redispersibility is then reduced from greater than 10 minutes to an acceptable 1-2 minutes. The present invention results in significant improvement in machine runnability and can, therefore, be used in ink jet printers.

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