Polyesters containing structural units derived from phosphonic acids or estere

US3962194A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Ulrich Bollert · Diedenbergen, DE
• Hans-Jerg Kleiner · Kronberg, DE
• Walter Herwig · Bad Soden, DE

Key dates

• Filing date: Feb 10, 1975
• Grant date: Jun 8, 1976
• Expiry date: Feb 10, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S260/24
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Permanently flame resistant filaments and fibers are produced from synthetic linear polyesters in which about 5 to 15 mol% of the acid component of the polyester consist of phosphinic acid structural units of the formula ##EQU1## in which R, R.sub.1 and R.sub.2 stand for organic radicals which may contain hetero atoms, preferably halogen, oxygen or sulfur. The filaments and fibers can be well dyed deep shades and are suitable in all fields of application where textiles which are hard to inflame are desired.