Way it is superior in resistance sweat degradation Characteristic leather, stand sheet condition ones

摘要

PURPOSE: To obtain a leathery napped sheetlike material, excellent in resistance to deterioration by perspiration and simultaneously improved in resistance to hydrolysis, deterioration by heat and light and dyeability and good in hand. ;CONSTITUTION: A leathery napped sheetlike material is obtained by impregnating polyamide ultra-fine fiber entangled nonwoven fabric having ≤0.2 denier, preferably 0.005-0.1 denier average size with a polyurethane elastomer polymer liquid having ≥60% strength retention in a state of a film, dyed with a green cobalt- containing dye and having 90-100μm thickness when kept both after 6 weeks at 110°C and after 6 weeks at 70°C and 95% relative humidity and ≤10% area swelling degree in oleic acid, coagulating the liquid and then buffing the surface. The aforementioned elastomer polymer is obtained by copolymerizing (A) a polymer diol consisting essentially of a polycarbonate having 500-3000 molecular weight with (B) a polymer diol consisting essentially of polyethylene glycol having 500-3000 molecular weight, a 2-6C low-molecular diol and/or a diamine (a chain extender) and an aromatic diisocyanate so as to provide (70/30)-(97/3) weight ratio of the components (A)/(B).;COPYRIGHT: (C)1993,JPO&Japio