Nylon latent-crimp yarn having outstanding elasticity and cool feel

Abstract

The present invention relates to a nylon latent-crimp yarn having outstanding elastic properties and cool feel, and is characterized in that a nylon 64 random copolymer (A) and one type of polymer (B) selected from nylon 6 and nylon 66 are subjected to conjugate spinning on a yarn cross-section in a side-by-side form. The nylon latent-crimp yarn according to the present invention has outstanding dyeing properties, dye fastness and elasticity, and exhibits high official moisture regain and a good cool feel. Also, the nylon latent-crimp yarn according to the present invention is inexpensive to produce, is highly suited to production, and also has outstanding yarn uniformity. For this reason, the nylon latent-crimp yarn according to the present invention is particularly useful as a fabric material for outdoor wear which is used like an elastic breathable waterproof polyurethane film.

1 . A nylon latent-crimp yarn having outstanding elasticity and cool feeling, the nylon latent-crimp yarn is characterized in that a nylon 64 random copolymer (A) and one polymer (B) selected from nylon 6 and nylon 66 are subjected to conjugate spinning on a yarn cross-section in a side-by-side form. 
     
     
         2 . The nylon latent-crimp yarn according to  claim 1 , wherein the nylon 64 random copolymer (A) includes 10 to 30 mol % of pyrrolidone which is a nylon 4 monomer, and 70 to 90 mol % of caprolactam which is a nylon 6 monomer, and has a molecular weight of 70,000 to 120,000 g/mol and a polydispersity index of 1 to 2. 
     
     
         3 . The nylon latent-crimp yarn according to  claim 1 , wherein the weight ratio of the nylon 64 random copolymer (A) to the one polymer (B) selected from nylon 6 and nylon 66, which are subjected to conjugate spinning on the yarn cross-section in a side-by-side form, is 25 to 50:75 to 50. 
     
     
         4 . The nylon latent-crimp yarn according to  claim 1 , wherein the nylon latent-crimp yarn has a shrinkage rate in boiling water of 30 to 50%, a crimping rate of 20 to 50%, and an official moisture regain of 5 to 8%. 
     
     
         5 . The nylon latent-crimp yarn according to  claim 1 , wherein the nylon 64 random polymer (A) has a relative viscosity (RV) of 2.4 to 3.0 measured by a sulfuric acid viscosimetric method, a melting point of 150 to 190° C., and a specific gravity of 1.11 to 1.13 g/cm 3 . 
     
     
         6 . The nylon latent-crimp yarn according to  claim 1 , wherein the one polymer (B) selected form nylon 6 and nylon 66 has a relative viscosity (RV) of 2.4 to 2.7 measured by the sulfuric acid viscosimetric method.