US 5,565,270 AGranted

Process for the production of elastane filaments

AssigneeBayer Aktiengesellschaft

InventorsBodo Rehbold, Hans-Josef Behrens, Erich Haug, G unter Spilgies, Rolf-Volker Meyer, Hanns-Peter M uller

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Abstract

The invention relates to a process for the solventless production of elastic filaments based on segmented poly(urethane)s or poly(urethane urea)s having improved thermal properties and, hence, improved processing behavior, for example during the heat setting of fabrics containing the elastic fibers, by the use of a polyisocyanate containing isocyanurate groups in the reaction of long-chain, relatively high molecular weight polyhydroxyl compounds with organic diisocyanates and low molecular weight diols and, optionally, other auxiliaries and additives in the melt, direct spinning of the reaction mixture thus obtained and thermal aftertreatment of the elastic filaments obtained and also to the filaments obtainable by this process.

Claims16

Dependent claims

A process for the production of elastane filaments comprising continuously reacting together

a) at least one macrodiol having a molecular weight of 1000 to 8000,
b) at least one diisocyanate,
c) at least one polyisocyanate having an average functionality of greater than 2,
d) diols having a molecular weight of up to 400 as chain-extending agents,
e) optionally catalysts and
f) optionally other auxiliaries and additives,
component (c) consisting of an isocyanurate polyisocyanate with an average functionality of greater than 2, components (b) and (c) being used in such a quantity ratio that the ratio of the number of isocyanate equivalents of component (b) to the number of isocyanate equivalents of component (c) is 99.5:0.5 to 80:20, to form a polyurethane, directly spinning the polyurethane through a nozzle without any further intermediate steps thereby to form elastane filaments, and thermally aftertreating the elastane filaments.

4 more elements

Dependencies are inferred from the claim text.