Patent ID: 8642185

Claim:
A process for producing leather, comprising treating a part-processed hide, a crust leather or a pelt with an aqueous float comprising (A) an amphiphilic organic copolymer, (B) a silicone compound having a carboxylic acid group or a carboxylic anhydride group per molecule, (C) a surface-active compound selected from emulsifiers having a phosphorus atom per molecule, (D) a surface-active compound selected from N-acylated amino acids, and (E) a surface-active compound comprising a C 10 -C 30 -alkyl radical, branched or unbranched, or a polyisobutene moiety, and an ionic or aqueous-ionizable group, other than the amphiphilic copolymer (A) and the surface-active compound (C), wherein the float is free of waxes and oils.