Patent ID: 8734542

Claim:
A method for improving the response behavior of mineral oil cold flow improvers C) in middle distillates which comprise at least one ashless nitrogen-containing detergent additive A), wherein A) is an oil-soluble amphiphilic compound which comprises at least one alkyl or alkenyl radical which is bonded to a polar group, wherein the alkyl or alkenyl radical comprises 10 to 500 carbon atoms and the polar group comprises 2 or more nitrogen atoms, comprising the step of nucleating a paraffin crystallization with at least one oil-soluble compound B), wherein B) is selected from copolymers of ethylene and 5 to 10.5 mol % of at least one ethylenically unsaturated carboxylic ester and wherein C) is different than B), and wherein C) comprises oil-soluble polar nitrogen compounds which are reaction products of compounds of the formula NR 6 R 7 R 8 in which R 6 , R 7 and R 8 may be the same or different, and at least one of these groups is C 8 -C 36 -alkyl, C 6 -C 36 -cycloalkyl, or C 8 -C 36 -alkenyl and the remaining groups are either hydrogen, C 1 -C 36 -alkyl, C 2 -C 36 -alkenyl, cyclohexyl or a group of the formula -(A-O) x -E or —(CH 2 ) n —NYZ in which A is an ethyl or propyl group, x is from 1 to 50, E=H, C 1 -C 30 -alkyl, C 5 -C 12 -cycloalkyl or C 6 -C 30 -aryl, and n=2, 3 or 4, and Y and Z are each independently H, C 1 -C 30 -alkyl or -(A-O) x , wherein A is an ethyl or propyl group, x is from 1 to 50, with compounds which contain at least one acyl group, wherein the middle distillate contains 10 to 10 000 ppm of an ashless nitrogen-containing detergent additive A) and wherein, based on one part by weight of the nitrogen-containing detergent additive A), 0.01 to 10 parts by weight of the oil-soluble compound B) are used.