Process for preparing ink compositions for ink-jets printers

Details Process for preparing ink compositions for ink-jets printers Process for preparing ink compositions for ink-jets printers

1986-05-27

1987-08-11

Morris, Theodore

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 22, C09D 1100

Patent

active

046859683

ABSTRACT:
A process for preparing an aqueous-based ink composition for use in ink-jet printers in disclosed. The process comprises (a) forming a solution of a dye having at least one negatively charged functional group per molecule; (b) acidifying the solution; (c) cycling the solution through a reverse osmosis membrane to form a concentrate and a permeate, the concentrate including a cation of the compound associated with at least one functional group on the dye and the permeate including a cation formerly associated with at least one functional group; (d) adding water as necessary (e) concentrating the dye by reverse osmosis; and (f) admixing the concentrated dye with at least one glycol ether. The pH of the ink composition is maintained below about 7.

REFERENCES:
patent: 4373954 (1983-02-01), Eida et al.
patent: 4465492 (1984-08-01), Putzar

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