| 摘要 |
The invention relates to a process for pickling and pretanning hides, which is characterised in that (I) the hides are pickled in an aqueous liquor A which is free from salts, and (a) contains a product of the reaction of phenol and a sulphonating agent, where the phenol:SO3 molar ratio is from 1:1.1 to 2.2, and (II) the pickled hides are pretanned in the same bath by addition of an aqueous composition B containing (b) a reductive saccharide having a dextrose equivalent of from 10 to 100, and (c) an aliphatic dialdehyde containing 2 to 8 carbon atoms. The present combined one-bath pickling/pretanning process allows the production, in treatment baths which are free from neutral salts and heavy metals, of readily shavable wet-white leathers which are suitable for further processing by all customary tanning methods. |
