Abstract

The invention relates to a tanning and/or retanning process for leather or a leather intermediate, comprising the steps of A tanning and/or retanning process for leather or a leather intermediate, comprising the steps of a) (i) tanning after a pre-treatment step and/or (ii) retanning after (ii.1) a pre-treatment step or (ii.2) with a parallel or (ii.3) subsequent treatment step, wherein the treatment or pre-treatment steps comprise adding to the leather intermediate in an aqueous medium a composition containing biopolymer microbeads in form of an aqueous dispersion or a dry powder, having a particle size, determined by laser diffraction based on volume density, with a Dv(90) in the range from 1 to 500 µm;; and b) working up and drying the resulting wet leather.

IPC Classes  ?

• C08L 1/02 - CelluloseModified cellulose
• C14C 3/06 - Mineral tanning using chromium compounds
• C14C 3/10 - Vegetable tanning
• C14C 3/20 - Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
• C14C 3/22 - Chemical tanning by organic agents using polymerisation products
• C14C 3/28 - Multi-step processes
• C14C 1/08 - DelimingBatingPicklingDegreasing
• C14C 9/02 - Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring

Abstract

A method of image recording on natural leather including the steps of: i) applying a base coat composition onto a surface of crusted leather, the base coat composition comprises water, a coloured pigment and a binder being a polyacrylate, a polyurethane, a polyamide or a polybutadiene, such as to form a base coat layer; and ii) applying a pre-treatment liquid onto at least a part of the base coat layer, the pre-treatment liquid comprising water, a fixing agent being a multivalent metal salt or a cationic polymer, a binder being a polyacrylate, a polyamide, a polyester, a polybutadiene or a polyurethane, such as to form a pre-treatment layer; and iii) inkjet printing an image onto the pre-treatment layer using an aqueous inkjet ink comprising a pigment and a water-soluble organic solvent. An image receiving natural leather substrate is also provided.

IPC Classes  ?

• B41M 5/00 - Duplicating or marking methodsSheet materials for use therein
• C09D 11/10 - Printing inks based on artificial resins
• C09D 11/102 - Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
• C09D 11/107 - Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
• C09D 11/108 - Hydrocarbon resins
• C09D 11/322 - Pigment inks
• C09D 11/38 - Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
• C09D 11/40 - Ink-sets specially adapted for multi-colour inkjet printing
• C09D 11/54 - Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
• B41M 5/50 - Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
• B41M 5/52 - Macromolecular coatings

Abstract

The invention relates to the use of a tannin-containing product which can be produced or is produced by means of (i) an aqueous solution or dispersion, containing one or more polar organic solvents, in the form of an extract, or (ii) a supercritical solvent in the form of a residue of the extraction, or (iii) pure water in the form of a residue of the extraction, or (iv) a mixture of a supercritical and a polar solvent in the form of a residue of the extraction, for tanning and/or retanning hides or skins or intermediate products thereof resulting from leather production; and further related subject matter of the invention.

IPC Classes  ?

• C14C 3/12 - Vegetable tanning using purified or modified vegetable tanning agents
• C14C 3/10 - Vegetable tanning
• C14C 3/28 - Multi-step processes
• C14C 9/02 - Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring

Abstract

The invention relates to a tanning agent comprising, as the tanning component, a synthetic peptide-modified polyphenolic tanning agent composition, obtainable in that (i) a hydrolysate is produced by means of base, enzymatic or acid hydrolysis of materials containing peptides and/or proteins and is admixed with a condensed aromatic compound in free and/or salt form containing sulphonic acid groups - obtained by condensation of an aldehyde with an aromatic compound in free and/or salt form containing sulphonic acid groups - and the mixture is subjected to condensation with an aldehyde to form a condensate, namely the synthetic peptide-modified polyphenolic tanning agent composition, or (ii) a condensate obtainable in that a material containing peptides and/or proteins is subjected in a first step to pretreatment by means of a monomeric aromatic compound containing sulphonic acid groups and to a first condensation to form a precondensate in the presence of an aldehyde or a combination of aldehyde and urea, and in a second step the precondensate is then subjected to a further condensation with an aldehyde and a further, monomeric aromatic compound in the form of phenol or a phenol derivative and/or with at least one monomeric aromatic compound, in free and/or salt form, containing sulphonic acid groups.

IPC Classes  ?

• C08G 16/02 - Condensation polymers of aldehydes or ketones with monomers not provided for in the groups of aldehydes
• C08L 61/00 - Compositions of condensation polymers of aldehydes or ketonesCompositions of derivatives of such polymers
• C08L 89/00 - Compositions of proteinsCompositions of derivatives thereof
• C14C 3/20 - Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
• C14C 3/28 - Multi-step processes
• C08L 89/06 - Products derived from waste materials, e.g. horn, hoof or hair derived from leather or skin

Abstract

Modified polylactones, aqueous compositions comprising them, as well as their use and methods comprising there use as fatliquoring agents ("fatliquors") in the treatment of leathers, including other invention embodiments as disclosed herein.

IPC Classes  ?

• C14C 9/02 - Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
• C08G 63/08 - Lactones or lactides
• C08G 63/82 - Preparation processes characterised by the catalyst used
• C14C 3/06 - Mineral tanning using chromium compounds
• C14C 3/20 - Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
• C14C 3/28 - Multi-step processes
• C14C 9/04 - Fixing tanning agents in the leather

Abstract

The present invention relates to a deliming composition and a deliming method using graft polymers from polysaccharides and/or polypeptides or the corresponding derivatives, obtainable by radical polymerization of a monomer, selected at least from, or a monomer mixture of, acrylic acid or methacrylic acid or the mixtures thereof.

IPC Classes  ?

• C14C 1/08 - DelimingBatingPicklingDegreasing
• C08L 51/02 - Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsCompositions of derivatives of such polymers grafted on to polysaccharides
• C08L 51/08 - Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsCompositions of derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• C08L 89/06 - Products derived from waste materials, e.g. horn, hoof or hair derived from leather or skin

Abstract

The invention relates to a device (1) for reducing the odor of tanned leather, comprising a treatment chamber (2), which is designed to dry tanned leather and/or treat dried leather, and at least one odor reducing reservoir (3), wherein the at least one odor reducing reservoir (3) has at least one odor-neutralizing substance (4), and a gas-exchange connection (5) is provided between the treatment chamber (2) and the odor reducing reservoir (3).

IPC Classes  ?

• C14C 15/00 - Apparatus for chemical treatment or washing of hides, skins, or leather
• C14B 3/00 - Milling leather
• C14C 3/06 - Mineral tanning using chromium compounds

Abstract

The invention relates to a composition and a method for tanning, in particular for pretanning, hides and/or skins, the composition for tanning being anhydrous and containing an acetal of an aldehyde tanning agent and a non-combustible organic solvent.

IPC Classes  ?

• C14C 3/16 - Chemical tanning by organic agents using aliphatic aldehydes
• C07D 307/00 - Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom

Abstract

The present invention refers to a process for tanning, pretanning or retanning leather comprising the steps of: a) providing leather stock, tanned or pre-tanned leather b) treating the leather or leather stock of step a) with an aqueous composition and/or a powder composition comprising at least one carboxymethyl cellulose and/or its salts (CMC), and c) drying.

IPC Classes  ?

• C14C 3/12 - Vegetable tanning using purified or modified vegetable tanning agents
• C14C 9/02 - Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
• C08L 1/28 - Alkyl ethers
• D06P 3/00 - Special processes of dyeing or printing textiles or dyeing leather, furs or solid macromolecular substances in any form, classified according to the material treated

Abstract

The invention relates to a composition containing an acetal of an aldehydic tanning agent for tanning hides and/or pelts and to a method for tanning hides and/or pelts in order to produce leather, wherein an acetal of an aldehydic tanning agent is used. By lowering the pH value, the aldehydic tanning agent can be released, whereby a tanning step is initiated. The composition and the method according to the invention are characterized by a lower toxicity compared to conventional compositions and tanning methods based on aldehydic tanning agents. Furthermore, an improved penetration of the tanning agents into deeper layers of the hide and/or the pelt is facilitated such that a particularly homogeneous tanning is achieved.

IPC Classes  ?

• C14C 3/16 - Chemical tanning by organic agents using aliphatic aldehydes

Abstract

The present invention is directed to a process for retanning leather comprising the steps of: a) providing tanned or pre-tanned leather b) treating the tanned leather of step a) with a composition comprising hollow microspheres, preferably as an aqueous composition,the hollow microspheres have a true density of from 0.01 to 0.10 g/cm3 (25°C) and/or a bulk density of the dry powder of 0.005 to 0.06 g/cm3 (25°C), c) drying, whereby the temperature of the leather during drying does not exceed 75°C. as well as to leather obtained by said process.

IPC Classes  ?

• C14C 3/20 - Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
• C14C 3/22 - Chemical tanning by organic agents using polymerisation products
• C14C 3/28 - Multi-step processes
• C14C 3/10 - Vegetable tanning
• C14C 9/02 - Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
• C14C 11/00 - Surface finishing of leather
• C09D 175/04 - Polyurethanes