Leather tanning process using aluminium (III) and titanium (IV) complexes
US4937009A · kind A · utility
1Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1987 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Oct 13, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC14C3/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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: EQU 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.