Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1994-08-26
1995-07-18
Buttner, David
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 9422, 252 857, 5253276, 5253277, C14C 322, C14C 902
Patent
active
054337526
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the use of reaction products of homo- or copolymers based on monoethylenically unsaturated dicarboxylic anhydrides with amines and alcohols for fatliquoring and filling leather and fur skins. The invention also relates to leather treatment compositions containing these reaction products.
To control the mechanical properties of leather, such as softness, flexibility or suppleness, it is common practice to employ aqueous fat emulsions (fat liquors) which are generally based on petrochemically produced or natural oils and fats. These oils and fats are in general rendered emulsifiable in water by partial sulfonation or by means of emulsifiers. Disadvantages of this class of fatliquoring agents are incomplete liquor exhaustion, relative ease of extraction by solvents or water, the occurrence of migration phenomena and unsatisfactory fastness profiles.
Polymeric products, based for example on unsaturated dicarboxylic acid derivatives and long chain olefins, that have fatliquoring properties for leather and fur skins are known and find utility as water repellents for leather and fur skins.
For instance, EP-A-412 389 recommends the use as water repellents for leather and fur skins of copolymers of C.sub.8 - to C.sub.40 -monoolefins and ethylenically unsaturated C.sub.4 - to C.sub.8 -dicarboxylic anhydrides, converted into aqueous solutions or dispersions by solvolysis of the anhydride groups, for example with bases such as amines, or partial esterification of the anhydride groups with alcohols and at least partial neutralization of the resulting carboxyl groups with bases in an aqueous medium.
Polymeric fatliquoring agents of this type do have some effect, but they are not entirely satisfactory for soft kinds of leather. Soft leathers require an additional, native or synthetic fat liquor that complements the action of the polymeric agent.
It is an object of the present invention to provide an improved fatliguoring and filling agent for leather and fur skins that is free of the prior art disadvantages.
We have found that this object is achieved by using reaction products of anhydrides and obtainable by free-radically initiated polymerization of dicarboxylic anhydrides of from 4 to 10 carbon atoms, general formula I ##STR2## where R.sup.1, R.sup.2 and R.sup.3 are each hydrogen, methyl or ethyl and, k is 1 or 2, -carboxylic acids, - to C.sub.5 -carboxylic acids, weight of further copolymerizable monomers, with hydrogen, C.sub.1 - to C.sub.20 -alkyl, C.sub.5 - to C.sub.8 -cycloalkyl or C.sub.2 - to C.sub.4 -hydroxyalkyl and R.sup.5 is C.sub.6 - to C.sub.30 -alkyl, C.sub.6 -to C.sub.30 -alkenyl, C.sub.5 - to C.sub.8 -cycloalkyl or C.sub.2 - to C.sub.4 -hydroxyalkyl, or alcohols of the general formula R.sub.6 -Q-(C.sub.m H.sub.2m O).sub.p -(C.sub.n H.sub.2n O).sub.q -H, where R.sup.6 is C.sub.1 - to C.sub.30 -alkyl, C.sub.2 - to C.sub.30 -alkenyl, C.sub.5 - to C.sub.8 -cycloalkyl or--if p+q>0--hydrogen, m and n are each from 2 to 4 and p and q are each from 0 to 50, or mixtures of such amines and alcohols,
Suitable monoethylenically unsaturated dicarboxylic anhydrides of from 4 to 10 carbon atoms (a) are in particular maleic anhydride, itaconic anhydride, citraconic anhydride, mesaconic anhydride, methylenemalonic anhydride and mixtures thereof. Maleic anhydride is particularly preferred.
In the general formula I for the aromatic vinyl compounds (b), R.sup.1 is preferably hydrogen or methyl, R.sup.2 and R.sup.3 are each preferably hydrogen and k is preferably 1. If when k is 1 R.sup.3 is methyl or ethyl, it is preferably in the para position. If when k is 2 R.sup.3 is methyl or ethyl, the substitution pattern on the phenyl is preferably 2,4.
Suitable aromatic vinyl compounds (b) are in particular styrene, .alpha.-methylstyrene and a mixture thereof.
Suitable vinyl esters (c) are in particular vinyl esters of C.sub.1 - to C.sub.4 -carboxylic acids, e.g. vinyl formate, vinyl propionate, vinyl butyrate or in particular vinyl acetate. Mixtures of such vinyl esters can also be used.
Suitab
REFERENCES:
patent: 2452536 (1948-11-01), Kirk
patent: 2746837 (1956-05-01), Kirk
patent: 4048422 (1977-09-01), Sackmann
patent: 5124181 (1992-06-01), Schaffer
patent: 5279613 (1994-01-01), Schaffer
Birkhofer Hermann
Danisch Peter
Denzinger Walter
Greif Norbert
Hartmann Heinrich
BASF - Aktiengesellschaft
Buttner David
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