Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
2005-01-18
2005-01-18
Edwards, N. (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S394000
Reexamination Certificate
active
06844060
ABSTRACT:
Described are a process for producing elastane yarn having a linear density of at least 2500 dtex by the wet spinning process and the thereby producible coarse linear density elastane yarn having a wide cross section and a low residual solvent content. The process comprises the steps of spinning an up to 35% strength by weight stable-viscosity elastane solution into a coagulation bath, washing and optionally drawing, drying by contact heating, setting, spin finishing and winding the yarn, the filaments leaving the coagulation bath passing around a diverting roller disposed just above the coagulation bath liquid, the as-spun filament linear density amounting to not more than 1% of the value of the final linear density, the jet stretch ratio being within the range from 0.5 to 50, the contact heating temperature being at least 220° C. and the contact time of the elastane yarn being at least 2 seconds.
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F. Fourne Chemiefasern/Textilinodustrie 44/96; Jun. 1994, p. 392.
P.A. Koch Faserstoff-Tabellen in Chemiefasern/Textilindustrie, Feb. 1979, p. 100.
Anderheggen Wolfgang
Herbertz Toni
Reinehr Ulrich
Sehm Tilo
Bayer Aktiengesellschaft
Bayer Faser GmbH
Edwards N.
Norris McLaughlin & Marcus PA
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