PHOSPHINIC ACID ADDUCTS WITH MALEIC ACID SEMIESTERS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE

摘要

The invention relates to adducts of phosphinic acid with maleic acid semiesters and salts thereof corresponding to the following general formula in which R1 is hydrogen or a methyl group, R2 is a linear or branched, optionally hydroxyl substituted C8-C18 alkyl or cycloalkyl group or an aryl group corresponding to the formula in which R3 and R4 may be the same or different and are hydrogen or a linear or branched unsubstituted C7-C12 alkyl group, M is H, Na, K or NH4, m is an integer of from 1 to 8, and n is 1 or 2. The invention also relates to a process for production of the adducts and to their use for the flotation of non-sulfidic minerals.