Mixtures of optical brighteners

US4169810A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Dieter Gunther · Kelkheim, DE
• Rudiger Erckel · Eppstein, DE
• Gunter Rosch · Bad Soden am Taunus, DE
• Heinz Probst · Pocking, DE

Key dates

• Filing date: May 8, 1978
• Grant date: Oct 2, 1979
• Expiry date: May 8, 1998

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06L4/65
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A mixture of optical brighteners containing 0.05 to 0.95 part by weight of a compound from the benzoxazolyl- or benzothiazolylstilbene series and 0.95 to 0.05 part by weight of a compound of the bis-benzoxazolyl- or bis-benzothiazolylstilbene series or of the benzoxazolyl- or benzothiazolyl-stilbene oxazolo[5,4-6]pyridinyl or oxazolo[2,3-b]pyridinyl series. These mixtures show an enhanced degree of whiteness as compared to the same amount of the single components.