Patent ID: 6254644
Filing Date: 2001-07-03
Classification: C08G,C14C

Abstract:
A process for preparing leather comprising(I) tanning a pelt with(a) an aldehyde, or(b) a bisulphite-blocked polyisocyanate;(II ) 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.