Process for producing elastane fibers of high elasticity and strength

US5061426A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Beatrix Frauendorf · Leverkusen, DE
• Siegfried Korte · Odenthal, DE
• Carlhans Suling · Odenthal, DE
• Rudi Dauscher · Dormagen, DE

Key dates

• Filing date: Sep 21, 1990
• Grant date: Oct 29, 1991
• Expiry date: Sep 21, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/7671
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of highly elastic elastane fibers (spandex fibers) based on segmented polyurethane (urea) elastomers having high elasticity and, at the same time, high strength values, balanced elastic properties and excellent thermal and hydrothermal behavior, wherein relatively high molecular weight, carbonate-linked, block-like polyester of polyester etherdiols having molecular weight of 3,300 to 7,000 are reacted with macrodiols with diisocyanates in a molecular ratio of 1:2.5 to 1:4.5 to obtain NCO prepolymers which have NCO contents of 2.10 to 4.0% NCO, then the NCO prepolymer is chain-extended with (cyclo)-aliphatic diamines to fom polyurethane (urea) elastomers.