Phthalocyanine and azo dyestuff mixtures and their use for dyeing paper

US4521217A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ulrich Beck · Bornheim, DE
• Frank-Michael Stohr · Odenthal, DE
• Horst Nickel · Leverkusen, DE

Key dates

• Filing date: Jan 6, 1984
• Grant date: Jun 4, 1985
• Expiry date: Jan 6, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S534/01
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Mixtures of a phthalocyanine dyestuff and a substantive azo dyestuff which preferably has cationic or basic groups are suitable for dyeing paper.