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US 6,599,629 B2Granted
Coated natural leather having low deformation
AssigneeE. I. Du Pont de Nemours and Company
InventorsYery A. Mendoza, Eleni Karayianni
Life of this patent
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Abstract
Coated natural leather, prepared from natural leather having polyurethane coated on its flesh side and having an improved (decreased) measure of deformation, is provided.
Claims10
Coated natural leather comprising:
- (a) natural leather having at least 15% elongation prior to coating;
- and
- (b) 5-70 wt %, based on the weight of uncoated leather, of elastomeric polyurethane, from a polyurethane solution having a viscosity of 1,000-300,000 centipoise as measured at about 22° C., coated on the flesh side of the leather which is capable of absorbing the polyurethane solution, wherein the coated leather has an elongation of at least 15%, a set of no more than 25%, and a measure of deformation at least 0.05 lower than that of the leather prior to coating.
A method for preparing coated natural grain leather comprising the steps of:
- (a) providing an elastomeric polyurethane solution having a viscosity of 1,000-300,000 centipoise as measured at about 22° C.;
- (b) providing natural leather having a grain side and a flesh side, and an elongation of at least 15%, wherein the flesh side is capable of absorbing the polyurethane solution;
- (c) coating the solution onto the flesh side of the leather in a quantity sufficient to afford 5-70% by weight, based on the weight of the leather prior to coating, upon drying the coating;
- and
- (d) drying the coating to afford coated leather having an elongation at least 15%, a set of no more than 25% and a measure of deformation of at least 0.05 lower than that of the uncoated leather.
2 more elements
Dependencies are inferred from the claim text.