Dyeing of paper

US5554261A · kind A · utility

Assignee

• BASF SE

Inventors

• Claudia Nilz · Rödersheim-Gronau, DE
• Norbert Sendhoff · Havelsee, DE
• Walter Breitschaft · Ludwigshafen, DE
• Manfred Zillig · Mannheim, DE
• Primoz Lorencak · Ludwigshafen, DE

Key dates

• Filing date: Mar 15, 1995
• Grant date: Sep 10, 1996
• Expiry date: Mar 15, 2015

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/28
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for dyeing paper in connection with paper manufacture by adding water-soluble anionic dyes and cationic polymers which contain vinylamine units to the paper pulp as fixing agents and removing water from the paper pulp with the formation of dyed paper is described.