Tanning agent and method

摘要

A leather tanning agent for use as sole tannage or with others includes Al(III) ions, Ti(IV) ions and an organic sequestrant in stated ratios. The ratio of Ti:Al, expressed as metal oxides TiO2:Al2O3, based on the weight, is between 0.6:1 and 2:1 and the amount of sequestrant is between 0.1 and 0.4 mol per mole of total metal oxides. Preferably SO4 ions are present. Other metal tanning agents such as zirconium salts may be included. The tanning agent is widely used and possesses enhanced stability.