C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
31/153
C09D 11/02 (2006.01) C09B 67/54 (2006.01) C09D 11/00 (2006.01)
Patent
CA 1315090
ABSTRACT OF THE DISCLOSURE A process is provided for reducing the crusting pro- pensity of dyes, complexed with sodium or other cations, used in ink-jet print heads and for improving other pro- perties of such dyes. The process comprises replacing at least a portion of the cations on such dyes with prese- lected cations, such as those of the alkali metals lith- ium, potassium, ammonium, and amines. A two-step process may be used, in which the sodium cations first are at least partially replaced with hydrogen cations by passing an aqueous solution of the dye through the hydrogen form of a strong acid ion exchange resin and the hydrogen cations subsequently are at least partially replaced with the preselected cations by neutralizing the hydrogen- containing dye solution with a base which contains the preselected cation species. Alternately, a one-step pro- cess, comprising passing the aqueous solution of the dye through an ion-exchange resin pre-loaded with the prese- lected cations may be employed.
537299
Johnson Loren E.
Lauw Hiang P.
Wenzel Donald E.
Hewlett-Packard Company
Sim & Mcburney
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