Manufacture of phosphorus nitride esters

US3957927A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Wurmb
• Dietmar Werner · Bad Dürkheim, DE
• Gerd Wunsch · Speyer, DE
• Volker Kiener · Bad Dürkheim, DE
• Wolfgang Schwarz · Ludwigshafen, DE

Key dates

• Filing date: Jul 2, 1974
• Grant date: May 18, 1976
• Expiry date: Jul 2, 1994

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/921
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Cyclic phosphorus nitride esters are prepared as flameproofers of high durability for use on regenerated cellulose. The known synthesis from cyclic phosphorus nitride chlorides with alcohols in the presence of amines is controlled under specific temperature conditions such that desired side-reactions permit the production, in a simple manner and in very high yields, of products showing a durability to washing not hitherto achieved.