Tanning process for obtaining leather
US10731230B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2014 |
| Grant date | Aug 4, 2020 |
| Priority date | — |
| Expiry date | Sep 30, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC14C1/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention concerns a process for tanning hide to obtain leather. The general process for obtaining the intermediary wet blue stage comprises the following steps: a) a picking step with acid and salt, followed by b) a tanning step with chromium salt, followed by c) a basification step. The invention is characterized in that the bath of the pickling step comprises organic acids selected from 2-Methyl glutaric acid (MGA), ethyl succinic acid (ESA) and mixture thereof instead of the traditional strong acid, generally sulfuric acid This process requires less basification agent and enables an increase of the up-taking of the re-tanning products. This invention provides leather with improved mechanical properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.