Re-tanning of chrome-free leather

摘要

(A) A retanning mixture comprising 2% to 15% by weight of an amphoteric polymer composition based on the wet weight of a wet white (chrome-free tanned skin) comprising an amine functional unit and an acid functional unit and wet Contacting the white; and (b) applying to the retanned wet white a polymer overcoat containing an acrylic copolymer having one or more metal transition elements having a thickness of 100 microns or less. A method is provided for forming chrome-free retanned leather. Also provided is a chrome-free retanned leather formed by the present method. [Selection figure] None