Electrocoagulation printing ink

Details Electrocoagulation printing ink Electrocoagulation printing ink

C - Chemistry, Metallurgy

09

D

C09D 11/02 (2006.01) B41C 1/10 (2006.01)

Patent

CA 2200143

The shelf-life of an electrocoagulation printing ink consisting essentially of a liquid colloidal dispersion containing an electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte, a pigment and a dispersing agent uniformly dispersing said pigment into the dispersion, is increased by selecting as the dispersing agent an alkali metal salt of a naphthalenesulfonic acid-formaldehyde polycondensate having the general formula: (see fig. I) in which R is an alkali metal and n is an integer ranging from about 5 to about 12.

La durée de conservation d'une encre d'imprimerie électrocoagulante, constituée essentiellement d'une dispersion colloïdale liquide contenant un colloïde coagulable electrolytiquement, un milieu de dispersion, un électrolyte soluble, un pigment et un agent de dispersion dispersant uniformément le dit pigment dans la dispersion, est prolongée en sélectionnant comme agent de dispersion un sel de métal alcalin de polycondensat d'acide naphthalènesulfonique-formaldéhyde de formule générale : (voir fig. I) dans laquelle R est un métal alcalin et n est un nombre compris entre environ 5 et environ 12..

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