Method for manufacturing leather not oxidizing silver

The chemical process of neutralizing hydrogen sulfide during tanning and subsequent dyeing retanning ensures leather does not oxidize silver, addressing the classic issue of metal oxidation in leathers, making it suitable for premium applications.

WO2024263110A1PCT designated stage expired Publication Date: 2024-12-26SOCIÉTÉ TANNERIES MÉGISSERIES DU MAGHREB
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Patent Information

Application Number
PCT/TN2023/050005
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-21
Filing Date
2023-10-11
Publication Date
2024-12-26

AI Technical Summary

Technical Problem

Leathers manufactured using the classic process tend to oxidize metals when in contact, due to residual hydrogen sulfide (H2S) trapped in the fibers, leading to issues with silver oxidation.

Method used

A chemical process is introduced during tanning that neutralizes hydrogen sulfide (H2S) through a series of washing operations using oxidants, followed by a special dyeing retanning process to consolidate the leather's non-oxidizing properties, ensuring all H2S is eliminated and the leather is 'clean and inert' for further processing.

Benefits of technology

The process results in leather that does not oxidize silver, making it suitable for high-end applications like jewelry cases and luxury watches, while maintaining durability and aesthetic qualities, by ensuring the leather is free from H2S and its regenerative substances.

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Abstract

Traditionally, raw skins are transformed into useful leather in a sequence of complex chemical operations. In the present invention, the chemical products used in the tanning and dyeing processes have specific characteristics under well-determined pH and temperature conditions in order for the finished leather not to oxidize silver. The physical characteristics of this leather are comparable to those of conventionally treated leathers.
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Citation Information

Patent Citations

  • PROCESS PERFECTED FOR TREATING IN ACID BATHS SKINS IN TRIPES SKINNY USING SULPHIDES

    FR2351175A1

  • Process for Dehairing and Liming of Hides, Skins or Pelts

    US20220347069A1

  • Tanning method

    US4314803A