Process for the preparation of poly(thio)hydantoins

US4246393A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilfried Zecher · Leverkusen, DE
• Jurgen Lewalter · Odenthal, DE
• Rudolf Merten · Leverkusen, DE
• Willi Dunwald · Leverkusen, DE

Key dates

• Filing date: Nov 8, 1978
• Grant date: Jan 20, 1981
• Expiry date: Nov 8, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/0616
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of a poly(thio)hydantoin, which comprises reacting an organic isocyanate or isothiocyanate having two or more isocyanate or isothiocyanate moieties with an unsaturated dicarboxylic acid of the formula: ##STR1## at a temperature of from -20.degree. C. to +500.degree. C., wherein R.sub.1 and R.sub.2 are hydrogen, halogen, substituted or unsubstituted aliphatic, aliphatic-aromatic, aromatic or heterocyclic.