| 摘要 |
PURPOSE:To obtain a leather-like material having excellent durability and feeling, and elegant surface appearance, by impregnating a specific urethane solution containing a specific amount of nitrogen atom originated from isocyanate group into a piece of cloth and coagulating the solution under stretching. CONSTITUTION:A solution of a polyurethane composed of (A) a polymer diol composed mainly of poly-3-methylpentane adipate having a molecular weight of 500-3,000 (B) a 2-6C low-molecular diol and (C) 4,4'-diphenylmethane diisocyanate and containing 3.5-6wt%, preferably 4.0-5.0wt% nitrogen atom originated from the isocyanate group in said urethane, is impregnated in and/or applied to a piece of cloth (especially nonwoven cloth of ultrafine fiber). The clock is stretched longitudinally by 0-10%, and immersed under tension in a non-solvent of said polyurethane (e.g. water) or in a texture of solvent and non-solvent to effect the coagulation of polyurethane.
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