Patent ID: 6830715
Filing Date: 2004-12-14
Classification: D01F,Y02P

Abstract:
Process for producing elastane fibers by the dry spinning process or the wet spinning press using spinning solutions of elastane recycling material, optionally with the addition of fresh elastane solution, whereina) the waste obtained from elastane fibers, is cut up to a cut length of at least 0.1 mm, b) the cut elastane fibers and 0.1 to 2 wt. %. based on the content of solid elastane, of a secondary aliphatic amine are introduced into the spinning solvent, c) the mixture of cut elastane fibers, spinning solvent and secondary aliphatic amine is heated at a temperature of 60Â° C. to 150Â° C., with homogenization, d) the resulting homogeneous elastane spinning solution is prefiltered, e) optionally with the addition of fresh elastane solution, the elastane spinning solution is mixed at 70Â° C. to 140Â° C. with a fresh elastane solution, in any mixing ratio and heating is continued, f) the resulting spinning solution is cooled to a temperature of at not more than 70Â° C., and filtered once more, g) the finished spinning solution is optionally remixed, and subsequently spun into elastane fibers by the dry spinning process or the wet spinning process.