Coloring paper

US5131981A · kind A · utility

Assignee

• BASF SE

Inventors

• Erwin Hahn · Heidelberg, DE
• Georg Henning · Ludwigshafen, DE
• Manfred Mielke · Heidelberg, DE
• Hans-Juergen Degen · Lorsch, DE
• Sigberg Pfohl · Speyer, DE

Key dates

• Filing date: Jun 6, 1991
• Grant date: Jul 21, 1992
• Expiry date: Jun 6, 2011

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/375
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

The wet-end coloring of paper with pigments and fixers is carried out by a process in which the pigment and fixer are added simultaneously to the paper pulp to be colored, and the fixer used is a cationic fixer, in an amount of from 0.01 to 3% by weight, based on the dry paper pulp to be colored.