Compositions – Leather or fur treating
Patent
1998-01-28
1999-03-23
Green, Anthony
Compositions
Leather or fur treating
8 9421, 427389, 428540, C14C 900
Patent
active
058854746
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the use of products which can be obtained by reaction of polysuccinimide with amine as leather auxiliaries. The use of these auxiliaries leads to desirable properties, such as a good body, soft feel and excellent grain smoothness and solidity of grain.
Leathers of little body are thin and hard and have a low flexibility. With the aid of leather auxiliaries, attempts are made to achieve the desired properties before, during and/or after tanning. It should be remembered here that, in spite of its softness, the leather should also have an adequate mechanical strength. Furthermore, the leather surface should not be tacky; it should have a pleasant feel. Some auxiliaries result in leathers which tend to have a loose grain; this undesirable concomitant phenomenon should also be avoided.
Surprisingly, it has now been found that polyaspartic acid amides have the excellent action described above on leather.
The invention thus relates to the use of products which have a molecular weight, determined as the number-average, of 700 to 30,000, preferably 1300 to 16,000, and are obtainable by reaction of number-average, of 500 to 10,000, preferably 500 to 6000, in particular 1000 to 4000, with polysuccinimide A, of primary and/or secondary amine, the nitrogen substituents of which contain 1 to 60, preferably 1 to 36, carbon atoms and can be substituted by fluorine atoms, hydroxyl groups, amino groups and/or organosilicon radicals and/or interrupted by oxygen atoms, ester groups, amides groups, urea groups or urethane groups, at least 2.5, preferably at least 15, in particular at least 30 mol % of the nitrogen substituents of the amine containing at least 12 carbon atoms, if appropriate C.sub.2 -C.sub.10 -dicarboxylic acids and/or (ii) monoisocyanates, diisocyanates or epichlorohydrin (for reaction of amino and/or hydroxyl groups on the nitrogen substituents of the reaction product of A and B), and (necessarily) of water,
The polysuccinimide A used as the starting substance for the polyaspartic acid amides to be used according to the invention is known. It can thus be prepared from aspartic acid water being split off; cf., for example, J. Org. Chem. 26 (1961) 1084; FR 70 24 831; P. Neri in J. Med. Chem. 16 (1973), 893; U.S. Pat. No. 4,363,797.
Other processes start from maleic acid or its anhydride and ammonia (German Offenlegungsschrift 4 305 368; and U.S. Pat. No. 4,839,461). Thus, for example, polysuccinimide can be prepared by reaction of 80 to 100 mol % of maleic acid and 20 to 0 mol % of succinic anhydride (as a chain stopper) with ammonia at elevated temperature, in general at 85.degree. to 240.degree., preferably 120.degree. to 180.degree. C., the water of reaction being removed.
U.S. Pat. No. 4,839,461 (=EP-A 256 366) describes the preparation from maleic anhydride, water and ammonia. According to this process, maleic anhydride is converted into the monoammonium salt in an aqueous medium with the addition of concentrated ammonia solution. This maleic acid monoammonium salt can be subjected to a thermal, optionally continuous polycondensation, preferably at 150.degree. to 180.degree. C. in a reactor over a residence time of 5 to 300 minutes, to give polysuccinimide.
The polysuccinimide A used as the starting compound can also be prepared by dehydration of polyaspartic acid.
The preparation of polyaspartic acid and its derivatives has been the subject matter of numerous publications for a long time. The preparation can thus be carried out by thermal polycondensation of aspartic acid (J. Org. Chem. 26, 1084 (1961); cf. also German Offenlegungsschrift 2 253 190 and U.S. Pat. Nos. 4,696,981, 5,296,578 and 5,288,783.
In a preferred embodiment, polyaspartic acid essentially contains recurring units of the following structures ##STR1##
In general, the proportion of the .beta.-form is more than 50%, in particular more than 70%, based on the sum of a+b.
In addition to the recurring aspartic acid units a) and b), it can contain further recurring units, for example ##STR2## d) maleic acid units of the
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Groth Torsten
Joentgen Winfried
Muller Nikolaus
Reiners Jurgen
Schmitz Gerd
Bayer Aktiengesellschaft
Green Anthony
LandOfFree
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