Biologically degradable leather
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United States of America Patent
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Jul 3, 2001
Grant Date -
N/A
app pub date -
Aug 23, 1999
filing date -
Feb 26, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for preparing leather by (I) tanning a pelt with (a) an aldehyde, or (b) a bisulphite-blocked polyisocyanate; (II) optionally, retanning the pelt with (a) a polyaspartic acid, a salt of a polyaspartic acid, a polyaspartic acid anhydride, or a mixture thereof, and/or (b) a polyaspartamide; (III) dressing the resultant product by (a) bottoming the product with a polyurethane and one or more natural bottoming assistants, and (b) applying a polyurethane and/or polyesteramide finish; and (IV) optionally, aftertreating the resultant dressed leather with a leather preservative.
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