Yarn formed of eastane fibers produced by the dry spinning or wet spinning of spinning solutions which include polydimethylsiloxane and ethoxylated polydimethylsiloxane
AssigneeBayer Aktiengesellschaft
InventorsMichael Kausch, Karl-Heinz Wolf, Wolfgang Klein, Konrad Schmitz
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Abstract
The invention relates to a spinning process, more particularly a dry spinning process, for the production of elastane fibers in which 0.8 to 2% by weight of polydimethylsiloxane with a viscosity of 50 to 300 cSt and 0.2 to 0.6% by weight of ethoxylated polydimethylsiloxane with a viscosity of 20 to 150 cSt are added to the elastane spinning solution before it is spun.
Claims9
A yarn formed of elastane fibers produced from polyurea polyurethane by dry spinning or wet spinning to form filaments, removing the spinning solvent, finishing, optionally twisting to form filaments, and winding the spun filaments, wherein
- A) from 0.8 to 2% by weight of polydimethylsiloxane having a viscosity of 50 to 300 cSt and
- B) from 0.2 to 0.6% by weight of ethoxylated polydimethylsiloxane having a viscosity of 20 to 150 cSt
- (Viscosities measured with a falling ball viscosimeter at 25° C.) the percentages being based on the siloxane content of the final fiber, are added to the spinning solutions before spinning.
Dependencies are inferred from the claim text.