Chrome-free leather retanning
AssigneeRohm and Haas Company
InventorsEdwin Nungesser, Andrew Hejl, Caiyun Li, Pu Luo
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Abstract
A method for forming chrome-free retanned leather including: (a) contacting wet white (chrome-free tanned hide) with a retanning mixture comprising from 2% to 15%, by solids weight, based on the wet weight of the wet white, of an amphoteric polymer composition comprising amine functional units and acid functional units; and (b) applying a polymeric overcoat containing an acrylic copolymer with one or more metal transition elements, with a thickness of no greater than 100 microns, to the retanned wet white, is provided. The present invention also provides a chrome-free retanned leather formed by the method.
Claims20
A method for forming chrome-free retanned leather comprising:
- (a) preparing a chrome-free tanned leather hide;
- (b) contacting the chrome-free tanned leather with a retanning mixture comprising from 2% to 15%, by solids weight, based on the wet weight of the chrome-free tanned leather hide, of an amphoteric polymer composition comprising amine functional units and acid functional units;
- and
- (c) applying a polymeric overcoat containing an acrylic copolymer with one or more metal transition elements, with a thickness of no greater than 100 microns, to the retanned leather wherein the polymeric overcoat further comprises polyurethane.
A method for forming chrome-free retanned leather comprising:
- (a) preparing a chrome-free tanned leather hide;
- (b) contacting the chrome-free tanned leather with a retanning mixture comprising from 2% to 15%, by solids weight, based on the wet weight of the chrome-free tanned leather hide, of an amphoteric polymer composition comprising amine functional units and acid functional units;
- and
- (c) applying a polymeric overcoat containing an acrylic copolymer with one or more metal transition elements, with a thickness of no greater than 100 microns, to the retanned leather wherein the acrylic copolymer of the polymeric overcoat contains phosphorus acid monomer units copolymerized therein.
A method for forming chrome-free retanned leather comprising:
- (a) preparing a chrome-free tanned leather hide;
- (b) contacting the chrome-free tanned leather with a retanning mixture comprising from 2% to 15%, by solids weight, based on the wet weight of the chrome-free tanned leather hide, of an amphoteric polymer composition comprising amine functional units and acid functional units;
- and
- (c) applying a polymeric overcoat containing an acrylic copolymer with one or more metal transition elements, with a thickness of no greater than 100 microns, to the retanned leather, wherein the polymeric overcoat further comprises from 5 to 20% by weight based on the solid content of the polymeric overcoat, of organic, solid spherical particle beads with a particle size of 3 to 10 microns, as measured using a Disc Centrifuge Photosedimentometer.
Dependencies are inferred from the claim text.