Deinking waste paper using a polyglycol and a phosphoric ester mixture

US5228953A · kind A · utility

Assignee

• BK Ladenburg GmbH Gesellschaft fur Chemische Erzeugnisses · DE

Inventors

• Inge Bast · Schriesheim, DE
• Margarete Scholl · Mannheim, DE

Key dates

• Filing date: Oct 30, 1991
• Grant date: Jul 20, 1993
• Expiry date: Oct 30, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/64
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for the recovery of fibers by means of flotation de-inking of waste paper which bears ink applied by flexographic printing or xerography, by reducing the paper to fibers in an aqueous medium with the addition of bleaching chemicals and auxiliaries containing peroxide, fatty acids, complexing agent, sodium hydroxide, and an additive based on polyglycol and a phosphoric ester mixture, produces fibers which are free from ink, which are useful as a recyclable material.