| 摘要 |
PURPOSE:To obtain an artificial leather, resembling natural leather and having a smooth surface, by sandwiching and pressing one surface of a substrate with a heating element surface and the other surface with a cooling element surface in a state of the residual nonsolvent in coagulating an impregnated and entangled polyurethane in a nonsolvent to provide the substrate for the artificial leather. CONSTITUTION:Interstitial parts of an entangles short fiber material containing >50% preferably 6-nylon are impregnated with a solution of a polyurethane elastomer in a water-miscible organic solvent, e.g. dimethylformamide, etc., and then dipped in an aqueous nonsolvent to coagulate the above-mentioned elastomer and provide a substrate for an artificial leather. One surface of the resultant substrate in a state of the residual nonsolvent in an amount of preferably about 30-150% based on the dry weight of the substrate is brought into contact, sandwiched, pressed with a heating element surface (at >= the softening point of the short fibers -50 deg.C - <= heat softening point) and passed therethrough and the other surface is brought into contact, sandwiched, pressed with a cooling element surface (>=5 deg.C - <= room temperature) and passed therethrough to evaporate and remove the nonsolvent near the surface in contact with the heating element surface. Thereby the aimed artificial leather having a formed dense and smooth surface as well as soft feeling resembling that of natural leather is obtained.
|
