| 摘要 |
<p>Process for the production of sheet products having a suede-like surface by application of a coating paste to a matrix whose surface has the structure of a negative of suede or suede-like materials, solidification of the coating by heating, stripping of the solidified coating from the matrix and, optionally, laminating it to a textile material, characterized in that: (a) a coating paste of a two-component system which does not harden to a polyurethane urea until heated, which system is based either on a blocked isocyanate prepolymer and a polyamine or on an isocyanate prepolymer and a complex of an alkali metal halide and an aromatic polyamine and, optionally, up to about 40% by weight, preferably less than about 30% by weight, more preferably less than about 25% by weight, and most preferably less than about 15% by weight, of solvent, so that the coating paste has a viscosity of at the most about 100,000 mPa.s at room temperature, is applied; (b) the coating is heated to a temperature of from about 30 DEG to 80 DEG C., the viscosity of the coating paste passing through a minimum which is at the most about 30,000 mPa.s; and (c) the coating is hardened to the polyurethane urea by heating to a temperature above about 90 DEG C.</p> |
