Flotation process for removing fillers from wastepaper in the presence of polymers and copolymers

US5238533A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Konrad Engelskirchen · Meerbusch, DE
• Herbert Fischer · Goldkronach, DE
• Klaus Hornfeck · Mettmann, DE
• Doris Oberkobusch · Goldkronach, DE
• Ludwig Schieferstein · Ratingen, DE

Key dates

• Filing date: Feb 28, 1992
• Grant date: Aug 24, 1993
• Expiry date: Feb 28, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/928
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the removal of fillers from waste paper, after floatation of the printing ink, in the presence of at least partly water-soluble polymers and/or copolymers having number average molecular weights of 1,000 to 500,000 by flotation.