Patent ID: RE40758

Claim:
A low-temperature-stabilized additive for fuel oils having a sulfur content of up to 0.05 weight percent, comprising fatty acid mixtures comprising A1) from 1 to 99 weight percent of at least one saturated mono- or dicarboxylic acid having from 6 to 50 carbon atoms, A2) from 1 to 99 weight percent of at least one unsaturated mono- or dicarboxylic acid having from 6 to 50 carbon atoms, and B) at least one polar nitrogen-containing compound , being a product of a secondary fatty amine having from 8 to 36 carbon atoms, which is effective as paraffin dispersant in middle distillates, in an amount of from 0.01 to 90 weight percent, based on the total weight of A1), A2), and B ) , wherein a mixture of A1) and A2) has an iodine number of at least 40 g of 1/100 g , and said at least one polar nitrogen-containing compound B) is a terpolymer comprising: I) 20 - 80 mol % of a divalent structural unit of formula 12 and a divalent structural unit selected from the group consisting of formula 14 , 13 , and mixtures thereof, where R 22 and R 23 , independently of one another, are hydrogen or methyl, a and b are zero or one and a+b is one, R 24 and R 25 are identical or different and are —NHR 6 , N(R 6) 2 or —OR 27 or a combination thereof, and R 27 is a cation of the formula H 2 N(R 6 ) 2 or H 3 NR 6 , and R 6 is selected from the group consisting of C 8 -C 36-alkyl, C 6 -C 36-cycloalkyl, and C 8 -C 36-alkenyl, II ) 19 - 80 mol % of a divalent structural unit of formula 15 in which R 28 is hydrogen or C 1 -C 4-alkyl, and R 29 is C 6 -C 60-alkyl or C 6 -C 18-aryl, and III ) 1 - 30 mol % of a divalent structural unit of formula 16 in which R 30 is hydrogen or methyl, R 31 is hydrogen or C 1 -C 4-alkyl, R 33 is C 1 -C 4-alkylene, m is a number from 1 to 100 , R 32 is C 1 -C 24-alkyl, C 5 -C 20-cycloalkyl, C 8 -C 18-aryl or —C(O)—R 34 , where R 34 is C 1 -C 40-alkyl, C 5 -C 10-cycloalkyl or C 6 -C 18-aryl .