US 12,291,817 B2
Method for the dyeing of leather and dyed leather having a high rubbing fastness
Michael Prokein, Oberhausen (DE); and Manfred Renner, Essen (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Appl. No. 18/013,129
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
PCT Filed Jun. 28, 2021, PCT No. PCT/EP2021/067629
§ 371(c)(1), (2) Date Dec. 27, 2022,
PCT Pub. No. WO2022/002821, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 10 2020 117 164.1 (DE), filed on Jun. 30, 2020.
Prior Publication US 2023/0141950 A1, May 11, 2023
Int. Cl. D06P 1/00 (2006.01); D06P 1/94 (2006.01); D06P 3/32 (2006.01)
CPC D06P 1/94 (2013.01) [D06P 3/32 (2013.01)] 18 Claims
OG exemplary drawing
 
1. Method for dyeing leather with an organic colorant in a supercritical fluid, the method comprising:
coating a surface of the leather to provide a coated surface of the leather, wherein the coating comprises an organically based varnish; and
dyeing the coated surface of the leather with the organic colorant in the supercritical fluid.