Leather tanning process using aluminium (III) and titanium (IV) complexes
AssigneeTioxide Group Limited
InventorAnthony D. Covington
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Abstract
In a leather tanning process, animal skins are treated with a tanning agent comprising an aluminium (III)/titanium (IV) mixed complex with a salt of a polyhydroxymonocarboxylic acid as a masking compound. The masking compound preferably has the general formula: HOCH.sub.2 (CHOH)n CO.sub.2 M wherein M is an alkali metal, and n is 2 to 6. Especially preferred masking compounds are sodium gluconate and sodium glucoheptonate. The same process can be used for a wide range of skins, both as a base tannage and in combination with other tanning processes.
Claims14
A leather tanning process in which animal skins are treated with a tanning agent comprising a mixed complex of aluminum (III) ions and titanium (IV) ions and as a masking compound a salt of a polyhydroxymonocarboxylic acid.
A process for tanning an animal skin comprising contacting the animal skin with a tanning agent, the tanning agent comprising a mixed complex of aluminum (III) ions, titanium (IV) ions and compound having the general formula
- HOCH.sub.2 (CHOH).sub.n CO.sub.2 M
- wherein M is an alkali metal, n is 2 to 6, the tanning agent having a pH in the range of from about 3 to about 5.
A tanning agent for animal skins comprising:
- a mixed complex of aluminum (III) ions, titanium (IV) ions and a compound having the general formula
- HOCH.sub.2 (CHOH).sub.n CO.sub.2 M
- wherein M is an alkali metal, n is 2 to 6, the tanning agent having a pH in the range of from about 3 to about 5 in an aqueous media.
Dependencies are inferred from the claim text.