Dye preparation for thermal ink-jet printheads using ion exchange,申请号US19860912868-传众专利搜索

Dye preparation for thermal ink-jet printheads using ion exchange

申请公布号：US4786327(A)

申请号：US19860912868

申请日期：1986.09.29

申请公布日期：1988.11.22

申请人：

HEWLETT-PACKARD COMPANY

发明人：WENZEL, DONALD E.;JOHNSON, LOREN E.;LAUW, HIANG P.

分类号：B41J2/01;C09B67/54;C09D11/00;(IPC1-7):C09D11/02

主分类号：B41J2/01

摘要：A process is provided for reducing the crusting propensity of dyes, complexed with sodium or other cations, used in ink-jet print heads and for improving other properties of such dyes. The process comprises replacing at least a portion of the cations on such dyes with preselected cations, such as those of the alkali metals lithium, 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 process, comprising passing the aqueous solution of the dye through an ion-exchange resin pre-loaded with the preselected cations may be employed.