Polyurethane-urea fibres with improved resistance
AssigneesBayer Aktiengesellschaft, Bayer Faser GmbH
InventorsUwe Zweering, Thomas Gross, Stephan Hütte, Andreas Endesfelder
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Abstract
Polyurethane-urea compositions are described, and, in particular, elastic polyurethane-urea fibers are described which result therefrom and which contain a dialkylsulphosuccinate as a finely dispersed or dissolved additive which considerably increases the strength of the fibers. Moreover, a method is described of producing polyurethane-urea fibers using a dialkylsulphosuccinate as an additive.
Claims12
A polyurethane-urea composition having improved mechanical properties, comprising
- A) from 99.98 to 65% by weight of a polyurethane-urea polymer,
- B) from 0.02 to 15% by weight, of a dialkylsulphosuccinate corresponding to general formula (2)
- wherein M+ represents Li+, Na+, K+ or NH4+,
- and
- C) from 0 to 20% by weight of additives.
Polyurethane-urea fibers which exhibit increased fineness-related strength, comprising polyurethane-urea polymers which contain from 0.02 to 15% by weight of a dialkylsulphosuccinate corresponding to general formula (2)
- wherein M+ represents Li+, Na+, K+ or NH4+,
- and wherein the dialkylsulphosuccinate is finely dispersed or dissolved in the fiber.
A method for increasing the strength of polyurethane urea fibers comprising polyurethane-urea polymers, which comprises dispersing a dialkylsulphosuccinate of formula 2
- wherein M+ represents Li+, Na+, K+ or NH4+ in the fiber in an amount from 0.02 to 15% by weight.
A method of producing improved polyurethane-urea fibers by the dry spinning or wet spinning process which comprises preparing the spinning solution, spinning the spinning solution using a spinneret, forming fibers downstream of the spinneret by removing the spinning solvent by drying or in a regeneration bath, and conditioning and taking up the fibers, wherein
- from 0.02 to 15% by weight of a dialkylsulphosuccinate corresponding to general formula (2)
- wherein M+ represents Li+, Na+, K+ or NH4+, is admixed with and dissolved in the polyurethane-urea solution before said solution is spun to form polyurethane-urea fibres.
Dependencies are inferred from the claim text.