Spandex fiber having improved adhesive characteristics with hot melt adhesive and method for manufacturing same
The present invention relates to a spandex fiber and a method for manufacturing the same that is capable of providing excellent adhesive characteristics, by means of a hot melt adhesive, between the spandex fiber and a polypropylene nonwoven fabric or a polyethylene film, during a diaper-manufacturing process. The method for manufacturing a spandex fiber comprises the steps of: preparing a polyurethane urea solution as a spinning solution; and dry-spinning the spinning solution to obtain the spandex fiber, where the polyurethane urea solution contains, with respect to the weight of the solid content, about 0.1 to 30 wt. % of an ethylene vinyl acetate monomer or polymer, or a derivative thereof, a C9 hydrocarbon-based resin monomer or polymer, or a derivative thereof, a C5 hydrocarbon-based resin monomer or polymer, or a derivative thereof, or a C5/C9 hydrocarbon-based resin monomer or copolymer, or a derivative thereof.
1. A spandex fiber having improved adhesive characteristics with a hot melt adhesive, wherein in a manufacture of the spandex fiber using a polyurethane urea polymer, a C9 hydrocarbon-based monomer represented by chemical formula 1 is used as an adhesion enhancer in an amount of 0.1 to 30 wt. % with respect to solid content of the polyurethane urea polymer to enhance the adhesive characteristics with the hot melt adhesive,
wherein a strength of the spandex fiber is 0.7 g/d or above and an elongation of the spandex fiber is 500% or above.
2. A spandex fiber having improved adhesive characteristics with a hot melt adhesive, wherein in a manufacture of the spandex fiber using a polyurethane urea polymer, a C5/C9 hydrocarbon-based copolymer prepared by copolymerization of the C9 hydrocarbon-based monomer represented by chemical formula 1 and C5 hydrocarbon-based monomer represented by chemical formula 2 is used as an adhesion enhancer in an amount of 0.1 to 30 wt. % with respect to solid content of the polyurethane urea polymer to enhance the adhesive characteristics with the hot melt adhesive,
wherein a strength of the spandex fiber is 0.7 g/d or above and an elongation of the spandex fiber is 500% or above.
3. The spandex fiber of claim 1 , wherein the strength of the spandex fiber is at 0.98 g/d or above and the elongation of the spandex fiber is 575% or above.
4. The spandex fiber of claim 2 , wherein the strength of the spandex fiber is at 0.99 g/d or above and the elongation of the spandex fiber is 599% or above.