Abstract: Tanned leather, skin or pelt is produced by non-metal tanning, comprising the step of tanning a bated hide, skin or pelt with a tanning agent (A), the tanning agent (A) being at least one compound of formula (I), wherein Hal signifies chlorine or fluorine, X signifies N or CR Y signifies hydrogen, C1-8-alkyl, C1-4-alkyl-carbonyl, C1-4-alkyl-sulphonyl or a radical of formula (Ia), or (Ib) —(—C2-3 alkylene-O—)q—H??(Ib) R signifies hydrogen or chlorine, q is 1 to 10 and M signifies hydrogen or an alkali metal cation or an ammonium cation, the ammonium cation being a protonated tertiary amine or a quaternary ammonium cation, in a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of the tanning step.

Abstract: Tanned leather, skin or pelt is produced by non-metal tanning, comprising the step of tanning a bated hide, skin or pelt with a tanning agent (A), the tanning agent (A) being at least one compound of formula (I), R—NH—Y—SO2—Z??(I), wherein R signifies a radical of formula wherein Hal signifies fluorine or chlorine, X signifies N or CR1, Y signifies an aliphatic, araliphatic or aromatic hydrocarbonic bridge which may optionally be interrupted by a heteroatom or heteroatomic group, Z signifies vinyl, ?-chloroethyl, ?-phosphatoethyl or ?-sulphatoethyl R1 signifies hydrogen or Cl, in a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of tanning step.

Abstract: The present invention pertains to a process for decreasing and/or drying skins which comprises contacting the skins to be degreased and/or dried with one or more extractor solvents which are able to dissolve both fat and water. Preferably, the extractor solvent is selected from the group consisting of dimethyl ether (DME), methylal, dioxolane, diethyl ether, methyl ethyl ketone, ethanol, propanol, and isopropanol. Most preferably, the extractor solvent is DME.

Abstract: Tanned leather, skin or pelt is produced by non-metal tanning, comprising the step of tanning with a tanning agent (A) of formula (I), wherein Hal signifies fluorine or chlorine, R1 signifies hydrogen, C1-8-alkyl or an alkyleneoxy radical of formula (Ia), —(—C2-3 alkylene-O—)q—H ??(Ia) R2 signifies C1-4-alkyl or C1-4-alkoxy, m signifies 1 or 2, n signifies 0 or 1, q is of from 1 to 10, M signifies hydrogen or an alkali metal cation or an ammonium cation, in a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of tanning step, the invention relates to the defined tanning process, particular tanning agent compositions, the use of the tanned leather, skins or pelts for further processing and the produced tanned and optionally further processed leather, skins or pelts.

Abstract: Fatliquoring agents for the production and/or for the treatment of leather comprising (A) at least one natural lipoid; (B) at least one polymer based on the monomers acrylic acid and/or methacrylic acid; (C) an emulsifier composition containing a C6- to C17-alkanol alkoxylated with up to 12 alkylene oxide units or a mixture of two or more such alkanols and a C12- to C24-fatty alcohol mixture alkoxylated with at least 15 alkylene oxide units.

Abstract: A material is impregnated into leather by incorporating the material into micro-capsules and then applying said micro-capsules to said leather material by means of a suitable process. A roller coating process is described in which the material is applied to a roller under which said leather material passes whilst compressed. Alternatively, the micro-capsules may be applied to said leather by drumming-in in a wet process.

Abstract: A method for producing leather generally including the steps of: (a) providing wet blue, full grain skins, (b) applying a liquid chrome solution to the skins while at a pH of 3.5 or lower, (c) raising the pH level of the skins to at least approximately 6.0 or above, (d) retaining the skins with a vegetable tanning agent, (e) introducing the skins to a dye bath, (f) introducing lubricants into the dye bath, (g) fixing the dyestuff and lubricants in the skins while reducing the pH level to the range of 3.3-3.8, (g) introducing the skins to a second dye bath, (h) fixing the dyestuff while reducing the pH level to a range of 3.0-3.5, (i) introducing the skins to a float containing a waterproofing agent, (j) fixing the waterproofing agent while reducing the pH level to approximately 3.0, (k) capping the skins to remove emulsifiers, and (1) introducing the skins to a bath containing flame resistant agents.