Process for mineral tanning, re-tanning or leather after-treatment
US5725599A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1995 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Mar 20, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC14C9/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the production of mineral tanned or/and re-tanned or/and after-treated leather or pelt, wherein before the mineral tanning, directly after the mineral tanning, directly before the mineral re-tanning, after the mineral re-tanning or/and with the after-treatment of a fatliquoring with a polyvalent metal cation, the substrate is treated with PA1 (A) a polymeric carboxylic acid containing .alpha.-hydroxyacrylic acid units, optionally in salt form, as constituent units of the polymer, by which a high exhaustion of mineral (re)tanning agent, an excellent distribution of the tanning agent and very pleasant soft handle of the (re)tanned leather resp. an outstanding water resistance of mineral after-treated fat-liquored leather can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.