Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1994-05-03
1996-03-26
Willis, Jr., Prince
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 9421, 8 9422, 8 9418, 8 9433, 252 857, C14C 900
Patent
active
055017070
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP92/01938 filed Aug. 8, 1992.
FIELD OF THE INVENTION
The oiling of vegetable- and/or mineral-tanned leathers and skins is an essential process step in the treatment cycle leading to the ready-to-use leather- or skin-based useful material. The manner in which the oil is distributed in the skin and the extent to which the oil components are bound into the skin critically determine the properties and usefulness of the end products. Extensive specialist knowledge exists on possible interactions between the oil components on the one hand and the tanned skin containing residual tanning agents on the other hand. The particular composition of the oiling preparations, for example the number of lipophilic groups and any reactive groups present for reaction with suitable reactive constituents in the tanned leather, determines inter alia the durability and effectiveness of the oiling treatment in the practical use of the leather and hide goods.
One aspect which is still important in practice is the provision of oiling preparations which can be bound in the tanned skin so reliably that the leather and hide goods are sufficiently resistant to washing and cleaning for practical requirements. High-quality leather goods, for example in the clothing industry, are supposed to lend themselves both to washing with detergents and even to dry cleaning without any significant loss of quality. The further requirement of adequate water tightness of the oiled leather is required in special cases.
BACKGROUND OF THE INVENTION
Basically, there are three known processes for the waterproofing of leather and skins, namely: solid fats, waxes or special polymers, high-viscosity emulsions on taking up water and which block the interstices between the leather fibers, for example special emulsifiers of the w/o type, chromium and/or zirconium complexes, silicones or organic fluorine compounds.
RELATED ART
DE 1 669 347 describes the use of water-emulsifiable sulfosuccinic acid semiesters for oiling leather, although no waterproofing effects are obtained. EP 193 832 describes a process for the production of waterproof leathers and skins using sulfosuccinic acid monoesters in combination with impregnating and/or hydrophobicizing oiling preparations which is characterized in that, after retanning, the leathers or skins are treated in aqueous solution with impregnating and/or hydrophobicizing oiling preparations containing sulfosuccinic acid monoester salts with C.sub.12-24 fatty residues and, after acidification, are fixed by addition of a chromium, zirconium and/or aluminium salt. The sulfosuccinic acid monoester salts are preferably used with impregnating oiling preparations from the group consisting of oxidized or oxidized and partly sulfonated C.sub.18-26 hydrocarbons or C.sub.32-40 waxes, phosphoric acid mono-C.sub.12-24 -alkyl esters, citric acid mono-C.sub.16-24 -alkyl esters, sorbitan, glycerol and/or pentaerythritol-C.sub.16-24 -fatty acid esters.
Amphiphilic preparations in the form of selected co-oligomers of, on the one hand, hydrophilic or oleophilic monomers and, on the other hand, hydrophilic monomer constituents have recently been described and recommended for the wet end treatment of, in particular, mineral-tanned leathers and skins. Amphiphilic preparations of this type may be incorporated, for example by milling, in the leathers or skins to be treated in the form of aqueous dispersions, emulsions and/or solutions on completion of the primary tanning stage. In the particular case of mineral-tanned leathers or skins, these amphiphilic preparations may also perform the retanning function. Finally, the amphiphilic preparations may be fixed in a final step, more particularly with mineral tanning agents. The more recent patent literature describes auxiliaries of the type in question. For example, EP 372 746 describes corresponding preparations and their use, the amphiphilic copolymers consisting predominantly of at least one hydrophobic monomer and, to a minor extent, of at least one copolymer
REFERENCES:
patent: 4605721 (1986-08-01), Jenkins et al.
patent: 4755187 (1988-07-01), Friese et al.
Conradi Joachim
Ruscheinsky Emil
Schieferstein Ludwig
Zauns-Huber Rudolf
Diamond Alan D.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Ortiz Daniel S.
Szoke Ernest G.
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