Process for the treatment of skins, hides or shett materials containing collagen by a dense, pressurized fluid
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United States of America Patent
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Apr 30, 1996
Grant Date -
N/A
app pub date -
Jun 2, 1994
filing date -
Oct 2, 1992
priority date (Note) -
Expired
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Abstract
A process for the treatment of products constituted by hides and skins with a view towards their transformation into leather, and for the treatment of leather which involves contacting the product with a dense, pressurized fluid, such as CO.sub.2, in the supercritical state or pressurized liquid, which optionally contains one or more active substances and a specified pressure Pi and temperature Ti, in order to provide degreasing of the skins if pure dense fluid is used, or to impregnate the products with active substances such as tanning, stiffening, dyeing or waterproofing agents. The products are subsesquently brought to atmospheric pressure to eliminate the dense fluid therefrom.
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