Process for deinking waste paper

Details Process for deinking waste paper Process for deinking waste paper

D - Textiles, Paper

21

C

D21C 5/02 (2006.01)

Patent

CA 2567626

The present invention relates to a process for deinking waste paper comprising treating the waste paper with a peroxide compound in an aqueous alkaline medium in the presence of a first polymer (A) comprising a Ca-binding polymer in the form of a polycarboxylate polymer and a second polymer (B) comprising a poly-alfa-hydroxyacrylic acid or a salt thereof or the corresponding polylactone, said process additionally comprising treating the waste paper with at least one non-ionic surfactant or with at least one combination of a non-ionic surfactant and a fatty acid or a salt thereof to promote ink detachment and/or ink removal.

La présente invention concerne un procédé servant au désencrage du vieux papier comprenant de traiter le vieux papier avec un composé peroxyde dans un milieu aqueux alcalin en présence d'un premier polymère (A) comprenant un polymère formant des liaisons avec Ca sous la forme d'un polymère de type polycarboxylate et un second polymère (B) comprenant un poly(acide alpha-hydroxyacrylique) ou un sel de celui-ci ou la polylactone correspondante, ledit procédé comprenant en plus de traiter le vieux papier avec au moins un tensioactif non ionique ou avec au moins une association d'un tensioactif non ionique et d'un acide gras ou d'un sel de celui-ci pour favoriser le détachement de l'encre et/ou l'enlèvement de l'encre.

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