Anion-based aqueous printing inks with improved deinkability

Details Anion-based aqueous printing inks with improved deinkability Anion-based aqueous printing inks with improved deinkability

C - Chemistry, Metallurgy

09

D

C09D 11/10 (2006.01) D21C 5/02 (2006.01)

Patent

CA 2166865

The invention pertains to water-based printing inks for paper printing, in particular flexographic and/or intaglio printing, containing finely dispersed pigments and binders based on synthetic polymer compounds as well as conventional additives, if desired, characterized in that selected polymer mixtures of (1) finely dispersed, aqueous-basic insoluble emulsion (co)polymers in intimate admixture with (2) aqueous-basic soluble and/or dispersible (co)polymer compounds with lower molecular weights than that of (1) are present as the binders for improving deinkability even in the flotation method involving waste paper printed with said ink, said polymer components being characterized by their glass transition temperatures (Tg) as follows: Tg (1) is equal to or less than 0°C and Tg (2) is equal to or higher than 0°C.

L'invention concerne des encres d'imprimerie à base aqueuse pour l'impression sur papier, notamment en flexographie et/ou en héliogravure, renfermant des pigments et des liants finement dispersés à base de composés polymères synthétiques et, le cas échéant, d'autre produits auxiliaires courants. Ces encres sont caractérisées en ce qu'en vue d'améliorer le désencrage, y compris dans le procédé par flottation, des vieux papiers imprimés avec ces encres, on utilise comme liants des mélanges polymères sélectionnés comprenant (1) des polymères ou des copolymères en émulsion, qui ne sont pas solubles dans l'eau pour donner une solution basique, finement dispersés et, mélangés intimement à ceux-ci, (2) des polymères ou des copolymères, solubles et/ou dispersibles dans l'eau pour donner une solution basique, de masse moléculaire plus faible par rapport à (1). Ces composants polymères présentent les températures de transition vitreuses (Tg) suivantes: Tg (1) égale ou inférieure à 0 DEG C, et Tg (2) égale ou supérieure à 0 DEG C.

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