Highly viscous condensation products containing sulfonic acid groups based on amino-s-triazines

US5789526A · kind A · utility

Assignee

• SKW Trostberg Aktiengesellschaft · DE

Inventors

• Josef Weichmann · Pleiskirchen, DE
• Franz Wolfertstetter · Palling, DE
• Herbert Winkelmann · Garching bei München, DE
• Alfred Kern · Schneeberg, DE

Key dates

• Filing date: Feb 22, 1996
• Grant date: Aug 4, 1998
• Expiry date: Feb 22, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G12/40
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a highly viscous condensation product containing sulfonic acid groups based on amino-s-triazines with at least 2 amino groups and formaldehyde which has a viscosity of 500 to 100,000 cp at 20.degree. C. and a pH value of 8.0 to 13.0 as an aqueous solution with a solids content of 20% by weight. The product is obtainable by (a) condensation of amino-s-triazine, formaldehyde and sulfite in a molar ratio of 1:1.9 to 2.9:0.7 to 1.3 in aqueous solution at a pH value of 9.0 to 12.0 and a temperature of 50.degree. to 90.degree. C. until the sulfite is no longer detectable, and (b) subsequent further condensation at a pH value of 2.0 to 5.0 and a temperature of 50.degree. to 100.degree. C. until the viscosity exhibits the desired value.