| 摘要 |
<p>A leather-like sheet material is provided which has a microporous surface and comprises a fibrous substrate layer (1) and a porous, skinless surface layer (2) having an apparent density of 0.25-0.48 g/cm<3> with pores having an average diameter of 15-300 mu m being dominatingly present therein. The surface layer (2) comprises polyurethane I in which the constituent organic diisocyanate is an aromatic ring-containing organic diisocyanate and the porous structure of at least the surface portion of the surface layer (2) is provided with polyurethane II prepared from an organic diisocyanate, which mainly comprises an aliphatic diisocyanate and/or an alicyclic diisocyanate, a polymer diol and a chain extender. The surface portion of the surface layer of the leather-like sheet material may be provided with a polyurethane coat layer which mainly comprises a fine particle polyurethane, or a coat layer made of a composition composed of a polyurethane, which mainly comprises a fine particle polyurethane, and a polyoxyethylene- or glycerol-modified hardened oil.</p> |
