Abstract: In the process of tanning for the production of leather comprising subjecting pickled uncured hides to the action of an aqueous liquor containing(1) chemical tanning or pretanning agents, and(2) auxiliary chemicals to tanning and recovering leather, the improvement consisting essentially of employing a water-insoluble aluminosilicate, containing bound water, of theformula(Cat.sub.2/n O).sub.x.Al.sub.2 O.sub.3.(SiO.sub.2).sub.ywherein Cat represents a cation selected from the group consisting of alkali metals, bivalent metal ions, trivalent metal ions and mixtures thereof, n represents an integer from 1 to 3 of the valence of the cation, x is an integer from 0.5 to 1.8 and y is an integer from 0.8 to 50, said aluminosilicates having an average particle size in the range of 0.1.mu. to 5 mm and a calcium binding power of from 0 to 200 mg CaO/gm of anhydrous active substance measured at 22.degree. C.

Abstract: In an improved process of tanning for the production of leather comprising subjecting pickled uncured hides to the action of an aqueous liquor containing (1) chemical tanning or pretanning agents and (2) auxiliary chemicals to tanning and recovering leather, the improvement consisting essentially of employing (i) a water-insoluble aluminosilicate, containing bound water, of the formula(Cat.sub.2/n O).sub.x.Al.sub.2 O.sub.3.(SiO.sub.2).sub.ywherein Cat represents a cation selected from the group consisting of alkali metals, bivalent metal ions, trivalent metal ions, and mixtures thereof; n represents an integer of from 1 to 3; x is a number of from 0.5 to 1.8; and y is a number of from 0.8 to 50, said aluminosilicates having an average particle size in the range of from about 0.1.mu. to 5 mm and a calcium binding power of from about 0 to 200 mg CaO/gm of anhydrous active substance measured at 22.degree. C.

Abstract: In the process of tanning for the production of dressed fur skins comprising subjecting pickled fur skins to the action of an aqueous liquor containing tanning agents, the improvement which comprises adding to the pickling bath as sole tanning agent a water-insoluble aluminosilicate, containing bound water, of the formula(Cat.sub.2/n O).sub.x .Al.sub.2 O.sub.3.(SiO.sub.2).sub.ywherein Cat represents a cation selected from the group consisting of alkali metals, bivalent metal ions, trivalent metal ions and mixtures thereof; n represents an integer from 1 to 3; or x is a number of from 0.5 to 1.8; and y is a number of from 0.8 to 50, said aluminosilicates having an average particle size in the range of from 0.1.mu. to 5 mm and a calcium binding power of from 0 to 200 mg CaO/gm of anhydrous active substance measured at 22.degree. C. according to the Calcium Binding Power Test Method.

Abstract: The present invention concerns a process for the softening of furs while at the same time taking the greatest possible care of the appearance of the hair. The process of this invention comprises contacting a fur with an acid aqueous liquor containing an acid protease from a fungus strain of the genus Rhizopus rhizopodiformis, said acid protease being effective in the pH range of from about 2.5 to 6.5.

Abstract: In the process of tanning for the production of leather comprising subjecting uncured hides to the action of an aqueous liquor containing (1) chemical tanning agents, and (2) auxiliary chemicals to tanning and recovering leather, the improvement consisting of essentially of employing water-insoluble aluminosilicate, containing bound water of the formula(Cat.sub.2/n O).sub.x.Al.sub.2 O.sub.3.(SiO.sub.2).sub.ywherein Cat represents a cation selected from the group consisting of alkali metals, bivalent metal ions, trivalent metal ions, and mixtures thereof, n represents an integer from 1 to 3 of the valence of said cation, x is an integer from 0.5 to 1.8 and y is an integer from 0.8 to 50, said aluminosilicates having an average particle size in the range of 0.1.mu. to 5 mm and a calcium binding power of from 0 to 200 mg CaO/gm of anhydrous active substance measured at 22.degree. C.

Abstract: In the process of washing and cleaning rawhides and fur skins before tanning comprising subjecting rawhides and fur skins to the action of an aqueous solution containing (1) surface-active compounds selected from the group consisting of anionic surface-active compounds, nonionic surface-active compounds and mixtures thereof, (2) emulsifiable solvents for fats and (3) electrolytes, removing said aqueous solution, rinsing, and recovering washed and cleaned rawhides and fur skins, the improvement consisting essentially of employing a fine-particulate, water-insoluble alkali metal aluminosilicate, containing bound water, of the formula(M.sub.2 O).sub.x.Al.sub.2 O.sub.3.(SiO.sub.2).sub.ywherein M represents an alkali metal, x is an integer from 0.7 to 1.5 and y is an integer from 0.8 to 6, said aluminosilicates having an average particle size in the range of from 0.1 to 25.mu. and a calcium binding power of from 20 to 200 mg CaO/gm of anhydrous active substance measured at 22.degree. C.