Tanning agent-free leather making method
US11739390B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2022 |
| Grant date | Aug 29, 2023 |
| Priority date | — |
| Expiry date | Aug 31, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC14C13/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A tanning agent-free leather making method is provided. A raw hide is subjected to controllable dehydration with a molecular sieve-polar organic solvent composite dehydration media to achieve a dehydrated hide, and then a tanning agent-free leather is prepared by increasing the surface roughness of the dehydrated hide and reducing the surface energy of the dehydrated hide. The present disclosure does not use any metal or non-metal tanning agent, which is eco-friendly. The present disclosure breaks the balance of water distribution between the raw hide and the polar organic solvent, which realizes a multi-medium self-driven directional controllable dehydration of the raw hide, effectively solving the problems during dehydration of the raw hide only using polar organic solvent. The molecular sieve-polar organic solvent dehydration system is easy to recover and can be recycled for the controllable dehydration of the raw hide multiple times. Therefore, a brand-new clean leather making technology is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.