CONDENSATES FOR THE RETANNING OF FE-TANNED LEATHER

A process for the retanning of iron-tanned leather, comprising applying to iron-tanned leather condensates based on: A) sulphonated aromatics, B) aldehydes and/or ketones and optionally C) one or more compounds selected from the group consisting of the unsulphonated aromatics, urea and urea derivati...

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Bibliographische Detailangaben
1. Verfasser:	JOHN D. WHITEMAN
Format:	Patent
Sprache:	eng ; spa
Schlagworte:	APPARATUS THEREFOR CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS FOR TANNING HIDES LEATHER MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PELTS SKINS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process for the retanning of iron-tanned leather, comprising applying to iron-tanned leather condensates based on: A) sulphonated aromatics, B) aldehydes and/or ketones and optionally C) one or more compounds selected from the group consisting of the unsulphonated aromatics, urea and urea derivatives for the retanning of iron-tanned leather, with the proviso that the content of naphthalenesulphonic acid/formaldehyde condensate and condensate based on phenol and formaldehyde is less than 25% by weight, preferably less than 5% by weight, based on the total amount of condensate. Uso de productos de condensacion a base de A) aromatos sulfonados, B) aldehidos y/o cetonas y, en caso dado, C) uno o varios compuestos, elegidos del grupo formado por los aromatos, urea y derivados de urea no sulfonados, para el recurtido de cuero curtido al hierro, con la condicion de que el contenido en condensado de acido naftalinsulfonico-formaldehido, y de condensado a base de fenol y de formaldehido sea menor que el 25 % en peso, preferentemente menor que el 5 % en peso, referido a la cantidad total del producto de condensacion.