Cross-linking of modified engineering thermoplastics

US6221923A · kind A · utility

Inventors

• Werner Schnurnberger · Stuttgart, DE
• Jochen Kerres · Esslingen am Neckar, DE
• Wei Cui · London, GB

Key dates

• Filing date: Jun 4, 1997
• Grant date: Apr 24, 2001
• Expiry date: Jun 4, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G75/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention pertains to a process for the cross-linking of modified engineering thermoplastics, in particular, of polymeric sulfinic acids or sulfinic acid salts. In particular, the invention pertains to a process for the preparation of cross-linked polymers, characterized in that solutions of polymeric sulfinic acids or sulfinic acid salts (--SO.sub.2 Me), optionally in the presence of organic di- or oligohalogeno compounds [R(Hal).sub.x ], are freed from solvent and cross-linked to polymers, wherein PA1 Me stands for a monovalent or polyvalent metal cation; PA1 R stands for an optionally substituted alkyl or aryl residue containing from 1 to 20 carbon atoms; and PA1 Hal stands for F, Cl, Br or I.