METHOD OF PRODUCING ALKENYL SUCCINIMIDES Russian patent published in 2025 - IPC C08F8/32 C08F8/46 C08G73/10 C10M149/22 C10L1/22 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing alkenyl succinimides with high thermal-oxidative stability, and can be used as a dispersing additive in lubricating oils for reducing formation of carbon deposits on parts of internal combustion engines. Method of producing alkenyl succinimides involves reacting maleic anhydride with raw material, followed by a step for amidation of alkenyl succinic anhydride (ASA) in the presence of a stabilizing diluent. Raw material used is polyisobutylenes, and the raw material component at the amidation step is ethyleneamines with molecular weight of 103 amu and more, wherein at the amidation process step, a mixture of esters of terephthalic acid and paraffin-naphthene oil is added to the reaction mass as stabilizing diluent at ratio of 1:9 to 1:1 by weight in amount of 50 to 100 wt.% per ASA.

EFFECT: method enables to obtain alkenyl succinimides, suitable for use as effective dispersing additives, with low viscosity, high dispersing properties, improved thermal-oxidative stability, and also leads to improvement of antifriction properties of lubricants containing a commercial additive.

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