B - Operations – Transporting – 44 – F
Patent
B - Operations, Transporting
44
F
18/28
B44F 9/12 (2006.01) B29C 43/22 (2006.01) B29C 59/02 (2006.01) C08G 18/10 (2006.01) D06N 3/00 (2006.01) D06N 3/14 (2006.01)
Patent
CA 1181207
PROCESS FOR THE PRODUCTION OF IMITATION SUEDES BY THE REVERSAL PROCESS ABSTRACT OF THE DISCLOSURE 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, solidifica- tion 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 iso- cyanate 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 to 80°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°C.
369614
Bayer Ag
Marcoux & Sher Swabey Mitchell Houle
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