Compositions – Leather or fur treating
Patent
1996-09-18
1998-03-17
Green, Anthony
Compositions
Leather or fur treating
8 941R, 8 9415, 8 9418, 8 9419R, 8 9422, 8 9423, C14C 902, C14C 100, C14C 314
Patent
active
057283133
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the use of water-dispersible and/or water-emulsifiable partial esters of cyclic polycarboxylic acids or (partial) anhydrides thereof and monohydric alcohols of fatty character as amphiphilic compositions for the oiling and, optionally, retanning of leathers and skins.
BACKGROUND OF THE INVENTION
The oiling of vegetable- and/or mineral-tanned leathers or skins is an essential step in the finishing process leading to the ready-to-use material. The way in which the fats are distributed in the skin and the extent to which the fatty components are bound into the skin critically influence the properties and usefulness of the end products. Extensive expert knowledge exists on possible interactions between the fatty components on the one hand and the tanned skin containing residual tanning agents on the other hand. The particular composition of the oiling compositions, for example the number of lipophilic groups and reactive groups present, if any, for reaction with suitable reactive constituents in the tanned leather, determine inter alia the durability and effectiveness of the oil finish in the practical use of the leather and skin products.
One aspect of practical importance is the provision of oiling compositions which can be so reliably fixed in the tanned skin that the leather and skin products are sufficiently resistant to washing and cleaning for practical requirements. High-quality leather goods, for example from the clothing industry, should be accessible both to washing with detergents and optionally to dry cleaning without any significant loss of quality. In special cases, the oiled leather is also required to be sufficiently waterproof.
RELATED ART
It is known that there are three basic processes for the waterproofing of leather and skins, namely: solid fats, waxes or special polymers, taking up water, form highly viscous emulsions that block the fiber interstices of the leather, for example special emulsifiers of the w/o type, chromium and/or zirconium complexes, silicones or organic fluorine compounds.
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 relates to a process for the production of waterproof leathers or skins using sulfosuccinic acid monoesters in combination with impregnating and/or hydrophobicizing oiling compositions, the process being characterized in that, after retanning in aqueous liquor, the leathers or skins are treated with impregnating and/or hydrophobicizing oiling compositions 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 aluminum salt. The sulfosuccinic acid monoester salts are preferably used with impregnating oiling compositions from the group 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 compositions in the form of certain selected co-oligomers of, on the one hand, hydrophobic or oleophilic monomers and, on the other hand, hydrophilic monomer constituents have recently been used for the oiling of, in particular, mineral-tanned leathers and skins. Amphiphilic compositions of this type may be incorporated in the leathers or skins to be oiled in the form of aqueous dispersions, emulsions and/or solutions, for example by milling on completion of the main tanning process. In the particular case of mineral-tanned leathers or skins, these amphiphilic compositions may also be used for retanning. Finally, the amphiphilic compositions may be fixed in a concluding 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 compositions and their use, the amphiphilic
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Ortanderl Stefanie
Ritter Wolfgang
Ruscheinsky, deceased Emil
Zauns-Huber Rudolf
Green Anthony
Henkel Corporation
Jaeschke Wayne C.
Ortiz Daniel S.
Szoke Ernest G.
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