METHOD OF TREATING FUR SKINS Russian patent published in 2000 - IPC

FIELD: fur industry. SUBSTANCE: invention is intended for use when treating sheepskin-fur coat and peltry- ware-fur stock. Fur skins are subjected to pretannage treatment with solution containing sodium chloride, organic acid, surfactant, and sodium thiosulfate followed by tannage with chrome tanner in amounts 0.67 to 0.85% (on conversion to chromium(III) oxide) of the weight of skins. Tanner is prepared by dissolving chromite-chromates in sulfuric acid at Cr(III)-to-Cr(VI) molar ratio (0.8-1.2):1 until deoxolation and deoiling of chromium(VI) oxide are complete, after which chromium(VI) reduced and basicity of tanner is adjusted with sodium or potassium dichromate. According to invention, pretannage and tannage are carried out in presence of dimethylsulfoxide. EFFECT: improved quality of intermediate product owing to reduced surface shrinkage and increased hair-to-derma attachment. 3 cl, 1 tbl