Coloring of paper

US4383834A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Juergen Degen · Lorsch, DE
• Wolf Guender · Neustadt, DE
• Guenter Frey · Schifferstadt, DE
• Werner Streit · Worms, DE
• Rolf Fikentscher · Ludwigshafen, DE
• Klaus Wulz · Lambsheim, DE

Key dates

• Filing date: Feb 19, 1982
• Grant date: May 17, 1983
• Expiry date: Feb 19, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/919
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for coloring paper with an acid dye and/or direct dye in an aqueous medium in the presence of a water-soluble reaction product of an alkylating agent, possessing an aromatic substituent, with a cationic polyelectrolyte. The process gives papers with high color strength and substantially avoids cylinder twosidedness of the coloration.