Dyed leather and method for dyeing tanned leather

Details Dyed leather and method for dyeing tanned leather Dyed leather and method for dyeing tanned leather

2005-07-12

2005-07-12

Einsmann, Margaret (Department: 1751)

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Leather dyeing

C008S436000, C008S094220, C008S652000, C008S657000, C008S661000

Reexamination Certificate

active

06916348

ABSTRACT:
Tanned leather is (a) pretreated in an aqueous and alkaline medium either with ammonia, primary amines or a mixture of ammonia and primary amines and then with a polyfunctional organic compound containing at least one aldehyde group as a functional group, or (b) in an aqueous and acidic medium with a polyfunctional organic compound and then ammonia, primary amines or a mixture of ammonia and primary amines, and (c) then dyed in an aqueous and alkaline medium with a water-soluble dye containing at least one functional group which is capable of reacting with one of the functional groups of the organic compound, forming a covalent bond. A tanned and dyed leather is obtainable with a high color intensity, outstanding wet fastness and excellent grain tightness, wherein the dye is permanently and covalently bonded to the leather via a bridging group, preferably in the region of the surface, and the bridging group is essentially bonded to the leather via —N═CH— groups.

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Jander-Blasus, “Lehrbuch der analytischen und praäparativen anorganischen chemie”, S. Hirzel Verlag Stuttgart, XP002187079, pp. 239-240, 1973.

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