ADDITIVE FOR CRUDE OIL, LUBRICATING OIL OR LIQUID FUEL, COMPOSITION BASED ON CRUDE OIL, LUBRICATING OIL OR LIQUID FUEL, AND ADDITIVE CONCENTRATE Russian patent published in 1998 - IPC

FIELD: petroleum processing and petrochemistry. SUBSTANCE: additive for improving cold fluidity of crude oil, lubricating oil and liquid fuel contains one or more low-soluble copolymers of ethylene and unsaturated monomer with general formula R⁵R⁶C=CHR⁷ where R⁶ is hydrogen or methyl and R⁵ is OOCR⁸ group in which R⁸ is hydrogen or straight-chain or branched C₁-C₂₈ (better C₁-C₁₇ and preferably C₁-C₈)-alkyl, or R⁵ is -COOR⁸ group in which R⁸ is as above but not hydrogen and R⁷ is hydrogen or -COOR⁸ defined as above, provided that, (i) when there is more than one copolymer, arithmetic mean of content of above-mentioned unsaturated monomer in copolymers is less than 11 mol %, and (ii) when there is one copolymer, content of above- mentioned unsaturated monomer in that copolymer is 6.5 to 10 mol %. EFFECT: optimized composition. 13 cl, 7 tbl