Leather tanning agent and process for making same

PCT No. PCT/SU81/00043 Sec. 371 Date Jan. 18, 1983 Sec. 102(e) Date Jan. 18, 1983 PCT Filed May 19, 1981 PCT Pub. No. WO82/04071 PCT Pub. Date Nov. 25, 1982.A leather tanning agent characterized in that it contains the following components, percent by weight: -sulphate of aluminum and ammonium 3 to 20 -containing 0.001 to 1.0% of TiO2 or -TiO2 and ZrO2 -and/or sulphate of zirconium and ammonium 20 to 50 -containing 0.001 to 0.5% of TiO2 -or TiO2 and Al2O3 -and sulphate of titanyl and ammonium -containing of 0.001 to 1.0% of Al2O3 -and/or ZrO2 the balance. - The above-mentioned additives of TiO2, ZrO2 and Al2O3 incorporated in the sulphates are present therein in a chemically combined state. In the process for producing the leather tanning agent a titanium-containing solution with a concentration of titanium of from 80 to 200 g/l as calculated for titanium dioxide is reacted with a solution of aluminum sulphate containing 80 to 130 g/l of aluminum as calculated for alumina, and/or a solution of zirconium sulphate containing 50 to 200 g/l of zirconium as calculated for zirconium dioxide in the presence of sulphuric acid and ammonium sulphate. The sulphate tanning agent according to the present invention can be very useful in the leather industry.