| 摘要 |
A leather tanning agent for use as a sole tannage or with another includes Al (III) ions, Ti (IV) ions and an organic masking agent in specific proportions. The ratio of Ti:Al expressed as metal oxides TiO2:Al2O3 on a weight basis is from 0.6:1 to 2:1 and the amount of masking agent is from 0.1 to 0.4 mole per mole of total metal oxides. Preferably SO4 ions are present. Other metal tanning agents such as zirconium salts can be incorporated. The tanning agent finds wide use and has an increased stability. |
