New leather oiling preparations and their use

Details New leather oiling preparations and their use New leather oiling preparations and their use

1995-02-17

1996-10-22

Green, Anthony

Compositions

Radioactive compositions

Nuclear reactor fuel

8 941R, 8 9422, 8 9423, 427389, C14C 900

Patent

active

055673430

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The oiling of vegetable- and/or mineral-tanned leathers and skins is an essential step in the finishing process leading to the ready-to-use material. The form in which the oil is distributed in the skin and the extent to which the oil components are fixed in the skin critically influence the properties and performance of the end products. Extensive expert 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 reactive groups present, if any, for reaction with suitable reactive constituents in the tanned leather--determine inter alia the permanence and effectiveness of the oil finish in the practical use of the leathers and skins.
An important practical aspect lies in the provision of oil finishes which can be so reliably fixed in the tanned skin that the leathers and skins are sufficiently resistant to washing and cleaning for practical requirements. High-quality leather goods, for example from the clothing industry, are expected to lend themselves both to washing with water/detergents and also to dry cleaning without any significant loss of quality. There are also special cases where the finished leather is required to show sufficient impermeability to water.
2. Discussion of Related Art
In principle, there are in particular three known processes for the waterproof finishing of leather and skins: solid fats, waxes or special polymers, highly viscous emulsions on taking up water and which 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 waterproof effects are obtained. EP 193 832 relates to a process for the production of waterproof leathers and skins using sulfosuccinic acid monoesters in combination with impregnating and/or hydrophobicizing oiling preparations, the process being characterized in that, after retanning, the leathers and skins are treated in an aqueous liquor with impregnating and/or hydrophobicizing oiling preparations containing sulfosuccinic acid monoester salts with C.sub.12-24 fatty groups 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 of oxidized or oxidized and partly sulfonated C.sub.18-26 hydrocarbons and 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, hydrophobic or oleophilic monomers and, on the other hand, hydrophilic monomers have recently been described for the oiling 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 finished in the form of aqueous dispersions, emulsions and/or solutions on completion of the main tanning process. In the case of mineral-tanned leathers or skins in particular, the amphiphilic preparations may also perform the retanning function. Finally, the amphiphilic preparations may be fixed, 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 lesser extent, of at least one copolymerizable hydrophilic monomer. The hydrophobic monomers listed include long-chain alkyl (meth)acrylates, long-chain alkoxy or alkylphenoxy (polyethylene oxid

REFERENCES:
patent: 4755187 (1988-07-01), Friese et al.
patent: 4946471 (1990-08-01), Friese et al.
patent: 5124181 (1992-06-01), Schaffer et al.

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