Use of modified inorganic particles in deinking

D - Textiles – Paper – 21 – C

Patent

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D21C 5/02 (2006.01)

Patent

CA 2636136

The present invention provides methods for deinking printed waste paper - particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle ("MIP") to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically- MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations ("ERIC") values.

La présente invention concerne des procédés pour le désencrage de vieux papiers imprimés, en particulier des procédés qui utilisent une composition de désencrage qui comprend des particules inorganiques modifiées ("MIP") de façon hydrophobe pour améliorer l'efficacité de la récupération de l'encre dans des conditions de désencrage alcalines, alcalines réduites et vraiment neutres traditionnelles. L'invention concerne des compositions de désencrage qui comprennent un substrat MIP de façon hydrophobe, un tensioactif non ionique et un acide gras ou des mélanges de ceux-ci. La meilleure récupération d'encre de la présente invention peut résulter en une pâte de vieux papiers désencrés de haute qualité et/ou en des produits qui ont une excellente blancheur et d'excellentes valeurs de concentration d'encre résiduelle effective ("ERIC").

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