Process for the dyeing of water-insoluble thermoplastic polymers and polycondensates in the mass

US4097444A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wolfgang Teige · Kelkheim, DE
• Rudolf Schickfluss

Key dates

• Filing date: Feb 28, 1977
• Grant date: Jun 27, 1978
• Expiry date: Feb 28, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B23/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Process for the dyeing of a water-insoluble thermoplastic polymer or polycondensate in mass, which comprises adding to the said thermoplastic material before the final molding thereof, an azlactone dyestuff of the formula (1) ##STR1## in which A and B each represents phenyl, lower alkyl-phenyl, lower alkoxy-phenyl, chlorophenyl, nitrophenyl, cyanophenyl, ##STR2## METHYLENE-DIOXY-PHENYLENE OR NAPHTHYL, A and B being identical or different, D represents phenylene, lower alkyl-phenylene, di-lower alkoxy-phenylene, monochlorophenylene, dichlorophenylene, biphenylene or naphthylene, and n represents the integer 0 or 1, or a mixture of dyestuffs of the said formula (1), the dyeings so obtained representing brilliant yellow dyeings of high tinctorial strength being distinguished by very good fastness to light, rubbing and ironing, and, particularly, by an outstanding stability toward heat.