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    • 3. 发明授权
    • Leather-like material having excellent water vapor permeability and
suppleness and its manufacture
    • 具有优异的水蒸汽渗透性和柔软性及其制造的皮革状材料
    • US5151240A
    • 1992-09-29
    • US410701
    • 1989-09-21
    • Koin AsanoKenichi TagawaHiroshi NakagawaHiroyuki Wakahara
    • Koin AsanoKenichi TagawaHiroshi NakagawaHiroyuki Wakahara
    • B29C41/30B44F9/12D06N3/00D06N3/14
    • B29C41/30B44F9/12D06N3/0095D06N3/14B29K2075/00B29K2995/0065Y10S428/904Y10T156/1023Y10T156/1039Y10T156/1041
    • A leather-like material having a soft feed and a high water vapor permeability comprises a substrate of a fiber aggregate and a microporous grain layer mainly comprising a polyurethane elastomer and having an average thickness between 20 .mu.m and 300 .mu.m, preferably between 20 .mu.m and 200 .mu.m, more preferably 20 .mu.m and 100 .mu.m. The grain layer has an inner layer portion permeating partly into interstices of the fiber aggregate and bonding thereto, a topside having been coagulated to set up with a flat and smooth, or animal skin-like, grain appearance and micropores having an average pore diameter gradient of from at least 4 .mu.m in the inner layer portion to at most 3 .mu.m in the surface layer portion. The leather-like material is characterized by a water vapor permeability of from 1 to 30 mg/cm.sup.2.hr and a Gurley stiffness ratio of article to substrate of at most 1.5. The leather-like material of the invention is manufactured by a process comprising the steps in sequence of: coating a release belt with a water-miscible solvent solution of a polyurethane elastomer; superimposing a water-moisturized substrate on the coated solution; heating the topside surface of the substrate to coagulate said polyurethane elastomer by the action of saturated water vapor forming within the substrate; and then releasing the resultant leather-like material from the release belt, followed by washing with water and drying.
    • 具有软进料和高水蒸汽渗透性的皮革状材料包括纤维聚集体的基材和主要包含聚氨酯弹性体的微孔颗粒层,其平均厚度为20-300μm,优选为20μm m和200亩,更优选20亩和100亩。 颗粒层具有部分地渗透到纤维聚集体的间隙中并粘合到其上的内层部分,顶层已经凝固以形成平坦光滑的或动物皮肤状的颗粒外观和具有平均孔径梯度的微孔 在表层部分中的内层部分中至少4μm至至多3μm。 皮革样材料的特征在于水蒸汽透过率为1至30mg / cm2.hr,并且制品与基材的Gurley刚度比至多为1.5。 本发明的皮革样材料通过包括以下步骤的方法制造:按照以下步骤:用聚氨酯弹性体的水混溶性溶剂溶液涂布剥离带; 将水保湿底物叠加在涂布溶液上; 加热衬底的顶面以通过在衬底内形成饱和水蒸气的作用使所述聚氨酯弹性体凝结; 然后从剥离带中释放所得的皮革样材料,随后用水洗涤并干燥。