Production of concentrates of titanium dioxide in polycaprolactam

US4388425A · kind A · utility

Assignee

• BASF SE

Inventors

• Hugo Strehler · Bischofswerda, DE
• Werner Hoerauf · Ludwigshafen, DE
• Guenter Valentin · Ludwigshafen, DE

Key dates

• Filing date: Jun 4, 1982
• Grant date: Jun 14, 1983
• Expiry date: Jun 4, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L77/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Concentrates of from 20 to 50% by weight of titanium dioxide in polycaprolactam are produced by a process in which a 5-15% strength by weight aqueous suspension of titanium dioxide is metered into a solution of caprolactam in water at from 100.degree. to 150.degree. C. at the same rate at which water is distilled off, and after the water has been distilled off the resulting mixture is polymerized at from 240.degree. to 280.degree. C.