Leather fat-liquoring agents

摘要

The present invention relates to a process for the preparation of a fat-liquoring compositions based on oxysulfited oils of animal and/or vegetable origin, the fatty substances employed containingP Pa) 70-99% by weight of fatty substances of animal and/or vegetable origin andPPb) 30-1% by weight of compounds of the formula I ##STR1## which differ from the compounds of component a) and in which R.sup.1, R.sup.2 and R.sup.3 independently of one another are branched or straight-chain, optionally substituted C.sub.1 -C.sub.24 - alkyl radicals,PPR.sup.4 is hydrogen or a straight-chain or branched, optionally substituted C.sub.1 -C.sub.8 -alkyl radical, PPm and n integers which are greater than zero andP Pthe process has the steps of:PPoxidation of compositions based on fatty substances containing the components a) and b) at a temperature above 40° C. andPPreacting the resulting oxidized composition with a 10 to 40% strength by weight aqueous solution of a base and subsequent sulfitation by addition of a 5 to 50% strength by weight solution of a sulfiting agent with simultaneous or subsequent heating.