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US 4,374,872 AGranted
Casein coatings for leather insolubilized with alkoxy alkyl ureas
AssigneeBASF SE
InventorsGuenter Eckert, Lothar Wuertele, Harro Petersen, Ulrich Goeckel, Kurt Fischer
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Abstract
A process is disclosed for insolubilizing casein coatings for leather utilizing alkoxy alkyl ureas. The coatings are cured in the presence of an acid catalyst. The casein coatings of the invention avoid the disadvantageous use of aldehydes such as formaldehyde and glutaraldehyde to cure the casein and reduce its water sensitivity and unexpectedly show improved wet abrasion resistance.
Claims6
A process for finishing leather and improving the wet abrasion resistance thereof comprising:
- (A) applying a coating to said leather with an aqueous coating composition consisting essentially of a mixture of casein and an alkoxy alkyl urea,
- (B) thereafter drying said coating and applying an acid catalyst thereto, and thereafter
- (C) drying, pressing, and curing said coating at ambient temperature to about 160.degree. C.
Dependencies are inferred from the claim text.