Daylight fluorescent pigments

US3939093A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Theodor Papenfuhs · Frankfurt, DE
• Ernst Spietschka · Idstein, DE
• Helmut Troster · Königstein, DE

Key dates

• Filing date: Dec 6, 1974
• Grant date: Feb 17, 1976
• Expiry date: Dec 6, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0061
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A daylight fluorescent pigment based on condensation resins which contain a compound of the formula ##SPC1## In which R.sub.1 is hydroxyalkyl of 1-8 carbon atoms or unsubstituted or substituted phenyl, carboxylic acid amide, cyano, nitro, sulfonic acid amide, alkylsulfone of 1-6 carbon atoms, acetylamino or unsubstituted or substituted benzoylamino or the triazolyl or benzimidazolyl radical, R.sub.2 is a straight-drained or branched alkylene radical of 1-8 carbon atoms which may contain as a bridging member between two alkylene moieties the phenylene or cyclohexylene radical or an oxygen or cycloalkylene and zis 1, 2 or 3. Compared with known pigment dyestuffs of the naphthalic acid imide series they have the advantage that they can be prepared with a dyestuff which is technically obtainable in an easy way. The daylight fluorescent pigments of this invention have a very good fastness to bleeding, a very high tinctorial strength, an improved fluorescence intensity and a very good brilliance. They are advantageously suited for the dyeing of lacquers and varnishes, printing pastes, inks, and plastic materials.