Process for preparing s-triazine prepolymers by condensation of an aromatic polyhydroxy compound with cyanuric chloride and thereafter reacting the condensation product with cyanogen halide in the presence of base

US3978028A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rudolf Sundermann · New Martinsville, US
• Rolf Putter
• Ernst Grigat

Key dates

• Filing date: Dec 4, 1974
• Grant date: Aug 31, 1976
• Expiry date: Dec 4, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/065
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

S-Triazine prepolymers, useful in the preparation of polytriazines, are prepared by condensing an aromatic dihydroxy or polyhydroxy compound with less than one-third mol of cyanuric chloride per hydroxy group. Thereafter the free hydroxy groups in the condensation product are reacted with a cyanogen halide in the presence of a base. The condensation is preferably carried out in a melt at temperatures of from 100.degree.-240.degree.C.