MODIFIED POLYCONDENSATES OF ASPARAGINIC ACID, METHOD FOR THE PRODUCTION THEREOF, AND THEIR USE IN FERTILIZERS

摘要

The invention relates to modified polycondensates of asparaginic acid which contain 0.1 to 50 mol % of at least one pyrazole compound which is covalently or ionically bound. The invention also relates to a method for producing the modified polyasparaginic acid by the condensation of a) asparaginic acid, mixtures of asparaginic acid and compounds which can be co-condensed therewith, and by the respective condensation of alkali metal salts or ammonium salt of the asparaginic acid with b) at least one nitrification inhibitor, preferably a pyrazole compound, at temperatures ranging from 120 to 270 DEG C and, afterwards, the optional hydrolysis of aspartimide units, said units being formed during the condensation, into asparaginic acid units or the salts thereof using alkali metal, alkaline-earth metal or ammonium bases, or by attaching at least one pyrazole compound to polycondensates containing aspartimide units, or by mixing polycondensates of asparaginic acid with nitrification inhibitors and using the modified polycondensates of asparaginic acid obtained in this manner as nitrification inhibitors and mineral fertilizers. Said fertilizers contain the modified polycondensates of asparaginic acid as a nitrification inhibiting addition, or mixtures of nitrification inhibitor(s) for the polycondensate of asparaginic acid in a weight ratio ranging from 0.01: 1 to 10: 1.