| 摘要 |
Filaments are made by extruding a copolymer of hexamethylene adipamide and hexamethylene isophthalamide, containing less than 10% by weight of the isophthalamide, preferably from 5-9%. The copolymer may be made from an aqueous solution containing a salt component consisting of 92% by weight hexamethylene diammonium adipate and 8% hexamethylene diammonium isophthalate to which is added 0.03% excess hexamethylene diamine as a viscosity stabilizer.ALSO:Copolyamide filaments of enhanced dyeability are made by extruding a copolymer of hexamethylene adipamide and hexamethylene isophthalamide containing less than 10% by weight of the isophthalamide, preferably from 5-9%. A filament comprising at least two component sections in eccentric or concentric relationship may be extruded, one section comprising the said copolymer and another section comprising a homopolyamide, especially polyhexamethylene adipamide. Example 1 illustrates the melt-spinning of the copolymer to form filaments, which are quenched, steamed, contacted with a liquid finish and wound up. Subsequently the wound-up filaments are drawn four times their as-spun length. The filaments are dyed with Perlon Fast Red 3BS at 55 DEG C., and take up the dye at 9.7 times the rate of take up of the same dye with polyhexamethylene adipamide filaments. Filaments may also be dyed with C.1. Acid Blue 113 at 80-90 DEG C. Potentially crimpable composite filaments may be made by concurrent extrusion of the copolymer melt and a homopolyamide melt to form eccentric (e.g. side-by-side) or concentric (e.g. core-and-sheath) composite filaments. In Example III such a side-by-side filament made by melt-spinning is quenched with air, and wound up. Subsequently the wound-up filaments are drawn to a ratio of 2.66, relaxed 11% in a steam tube at 175 DEG C., interlaced with an air jet and wound up. The filaments develop crimp on subjection to boiling water for about 15 minutes. The copolymer may be made from an aqueous solution containing a salt component consisting of 92% by weight hexamethylene diammonium adipate and 8% hexamethylene diammonium isophthalate to which is added 0.03% excess hexamethylene diamine as a viscosity stabilizer. |
