Use of ink formulations comprising mixtures of anionic waterfast dyes containing two or more carboxyl groups in thermal ink-jet printers to reduce nozzle clogging of the printer

Inks are provided comprising (a) at least two dyes corresponding to the formula wherein W is COOH, X is H, or COOH, Y is H, COOH, or SO3H, Z is H, COOH, or SO3H, and R is H, CH2COOH, or CH2CH2COOH; with the proviso that there are at least two COOH groups and that the number of COOH groups is equal t...

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Bibliographic Details
Main Authors WICKRAMANAYAKE, PALITHA, ADAMIC, RAYMOND J, RADKE, GAROLD E, HALKO, DAVID J, HINDAGOLLA, SURAJ L
Format Patent
LanguageEnglish
French
German
Published 25.01.1995
Edition5
Subjects
ADHESIVES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
INKS
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
POLISHES
USE OF MATERIALS THEREFOR
WOODSTAINS
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Summary:Inks are provided comprising (a) at least two dyes corresponding to the formula wherein W is COOH, X is H, or COOH, Y is H, COOH, or SO3H, Z is H, COOH, or SO3H, and R is H, CH2COOH, or CH2CH2COOH; with the proviso that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO3H groups, and (b) a solvent which may be water or a mixture of water and a water-soluble organic solvent provide excellent waterfast prints on paper. The inks preferably have a pH from about 7 to about 9.5. Also preferably, a phosphate is added to reduce kogation and a metal chelating agent is added to further reduce nozzle clogging.
Bibliography:Application Number: EP19910304845