Paper-coating slips containing fluorescent brighteners

US4888128A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jochen Koll · Odenthal, DE
• Friedhelm Muller · Odenthal, DE
• Werner Bieber · Monheim, DE
• Joachim Konig
• Udo Eckstein · Cologne, DE
• Hans Theidel

Key dates

• Filing date: Dec 11, 1987
• Grant date: Dec 19, 1989
• Expiry date: Dec 11, 2007

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/30
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Fluorescent brightener salts of the formula ##STR1## in which A denotes the anion of an anionic cellulose fluorescent brightener, PA1 R.sub.1 denotes alkyl, alkenyl, aralkyl, aryl or cycloalkyl, PA1 R.sub.2, R.sub.3 and R.sub.4 denote hydrogen or R.sub.1, or together, including the N atom, form a heterocyclic ring, and PA1 n denotes 1 or 2, are suitable for incorporation into paper-coating slips. The brightened coating slips are distinguished, inter alia, by the fact that the achievable greying limit is very high.