Pigmented inks for ink jet printers

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

Reexamination Certificate

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C106S031900, C106S476000, C347S100000

Reexamination Certificate

active

06958090

ABSTRACT:
There is provided an aqueous ink jet ink composition suitable for use in continuous ink jet printers comprising:(a) a surface modified carbon black pigment;(b) at least one organic pigment; and(c) an aqueous carrier medium.The black aqueous pigment ink formulated in accordance with this composition provides a dried ink film whereof the resistivity is increased to a level whereby no printer failure or print defects are caused by electrical shorts when the printer has been out of use for a sufficient time to allow the ink to dry out in parts of the apparatus. The ink may also comprise at least one dispersant for the organic pigment.

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Colour Index International, Pigments and Solvent Dyes, published by the Society of Dyers and Colourists 1997, no month available.

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