Deinking composition and method for deinking waste paper

D - Textiles – Paper – 21 – C

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D21C 5/02 (2006.01)

Patent

CA 2199745

A composition for use in flotation deinking of secondary fiber containing electrostatic ink and/or stickies and optionally conventional impact ink is provided. The composition consists essentially of displector deinking chemicals and non-ionic surfactant deinking additives such as: (i) capped aliphatic and alicyclic alkoxylates, e.g., chloride capped C5-C20 alkyl ethoxylates; (ii) alkyl phenol ethoxylates, e.g., octyl phenol ethoxylates; and (iii) a combination of (i) and (ii). Also described is a method for using the composition in a deinking process that includes a flotation step.

Composition destinée au désencrage par flotation d'une fibre secondaire renfermant de l'encre électrostatique et/ou des particules adhérentes et, facultativement, de l'encre d'impression classique. La composition consiste essentiellement en agents chimiques de désencrage dispersants-collecteurs et en additifs de désencrage tensio-actifs non ioniques tels que: (i) des alcoxylats aliphatiques et alicycliques à groupe terminal, par exemple des éthoxylats alkyle C5-C20 bloqués par un chlorure; (ii) des éthoxylats phénol alkyl, par exemple des éthoxylats phénol octyliques; et (iii) une combinaison de (i) et (ii). L'invention porte également sur le procédé d'utilisation de la composition dans un procédé de désencrage comportant une étape de flottation.

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