Branched low molecular weight polyesters levelling agents for dyestuff

US4168145A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Karl Hintermeier · Frankfurt am Main, DE
• Fritz Engelhardt · Frankfurt am Main, DE
• Joachim Ribka · Offenbach am Main, DE
• Helmut Beutler · Kelkheim, DE

Key dates

• Filing date: Sep 30, 1977
• Grant date: Sep 18, 1979
• Expiry date: Sep 30, 1997

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06P1/5271
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Dyeing with disperse dyes is made more uniform when there is used as a levelling agent a branched polyester which has an apparent average molecular weight of from about 600 to about 5,000, disperses itself in water, and is essentially an ester-linked combination of hydrocarbyloxy groups and carboxyl-derived acyl groups, the groups being linked together as a branched chain by the ester linkages and relative to the carboxy-derived acyl groups the polyester contains from about 5 to about 50 mol.% of COOH or COOM groups and less than 5 mol.% of SO.sub.3 M groups, wherein M denotes the cation of an alkali metal, the ammonium ion or the cationic radical of an organic amine, the number of branches on an interesterified group being not over three and at least 50 mol.% of the hydrocarbyloxy groups are in diethylene glycol or triethylene glycol groups.