HYGROSCOPICALLY EXOTHERMIC NONWOVEN FABRIC HAVING HIGH ABSORPTION AND DESORPTION OF MOISTURE

摘要

PROBLEM TO BE SOLVED: To produce hydgroscopically exothermic nonwoven fabric having high absorption and desorption of moisture, having comfortable heat retaining property and nature of dew condensation prevention by making a specific hygroscopically exothermic organic fine grain having high absorption and desorption of moisture adhere to nonwoven fabric through the medium of an adhesive. SOLUTION: This hygroscopically exothermic nonwoven fabric having high absorption and desorption of moisture is produced by imparting 1-100 wt.% (based on the fiber weight of nonwoven fabric) hygroscopically exothermic organic fine grain having high absorption and desorption of moisture using resin film having >=30 g/(m2.h.) moisture permeability and 30μm thickness as at least part of an adhesive. The fine grain has <=30μm average particle diameter and is prepared by subjecting an acrylic resin including >=85 wt.% acrylonitrile to hydrazine treatment to introduce a crosslinking structure and to increase the nitrogen content by 1.0-15.0 wt.%, and by the hydrolysis of >=1.0 m mol/g residual nitrile group to chemically convert it into a carboxylic salt. The hygroscopically exothermic nonwoven fabric having high absorption and desorption of moisture has >=0.8%/min initial moisture absorption speed at 20 deg.C and 65% RH and initial moisture desorption from (20 deg.C and 90% RH) to (20 deg.C and 40% RH) respectively.