Patent Number: 6,254,644

Title: Biologically degradable leather

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.

Inventors: Traubel; Harro (Leverkusen, DE), Muller; Hanns-Peter (Odenthal, DE), Reiff; Helmut (Leverkusen, DE), Reiners; Jurgen (Leverkusen, DE), Renner; Gerd-Friedrich (Kurten, DE), Koch; Rainhard (Koln, DE), Pisaric; Karl (Pulheim, DE)

Assignee: Bayer Aktiengesellschaft

International Classification: C08G 18/00 (20060101); C08G 18/80 (20060101); C14C 3/08 (20060101); C14C 3/18 (20060101); C14C 9/00 (20060101); C14C 11/00 (20060101); C14C 3/00 (20060101); C14C 3/28 (20060101); C14C 003/00 ()

Expiration Date: 07/03/2018