C - Chemistry – Metallurgy – 14 – C
Patent
C - Chemistry, Metallurgy
14
C
8/55
C14C 13/00 (2006.01) C14C 3/00 (2006.01) C14C 5/00 (2006.01)
Patent
CA 1267753
Abstract of the Disclosure A process for the preparation of fish skin consists in a) descaling and at least partially degreasing of the skins in a bath containing one or more surface active anionic, non-ionic or amphoteric organic compounds in a small amount of water, b) treating the skins in a second bath containing a keratolytic enzyme or an alkali metal sulphide and/or alkali metal hydrogen sulphide, lime and water under stirring and optionally further removing the sulphide by adding a precipitating agent for the sulphide and washing, c) degreasing the skins simultaneously with step b) or in a separate bath by means of surface active non- ionic and/or anionic compounds and/or solvents and/or enzymes, d) pretanning the skins with an aromatic syntan at a tem- perature of below 20°C and a pH of 5 to 8, e) pickling the skins in an acid and salt containing pickling bath at a pH of 1.5 to 4 and f) tanning the skins in a.manner known per se with a chromium and/or syntan tanning solution and g) optionally, after a resting period of several hours, washing and retanning the skins with chromium or aluminium salts and/o r syntans and subsequently, if desired,dyeing and fat liquoring in a known manner, drying and further mechanical processing of the skins.
526836
Berbardo von Beck
Ernst Rudolf
Swabey Ogilvy Renault
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