Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Mikael Svedman0
Bob Horacek0
Jukka Jäkärä0
Date of Patent
June 8, 2010
Patent Application Number
11570452
Date Filed
June 16, 2005
Patent Primary Examiner
Patent abstract
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.
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