Additives for improving the cold flow properties and the storage stability of crude oil

An additive for improving the flowability of mineral oils comprising

• A) from 1 to 40% by weight of at least one copolymer which is oilsoluble and is a cold-flow improver for mineral oils selected from
• A1) copolymers of from 80 to 96.5 and mol % of ethylene and from 3.5 to 20 mol % of vinyl esters of carboxylic acids having from 1 to 20 carbon atoms and/or (meth)acrylic esters of alcohols having from 1 to 8 carbon atoms, and
• A2) homo- or copolymers of esters which bear C10-C30-alkyl radicals and are esters of ethylenically unsaturated carboxylic acids comprising up to 20 mol % of further olefinically unsaturated compounds,
• B) from 20 to 80% by weight of at least one poly-α-olefin having a molecular weight of from 250 to 5000 which is derived from monoolefins having from 3 to 5 carbon atoms, and
• C) from 5 to 70% by weight of at least one organic acid selected from
• C1) alkylphenol-aldehyde resins of the formula 1
• 5
• where R1 and R2 are each independently H or alkyl radicals having from 1 to 30 carbon atoms, but where both radicals may not at the same time be H, n is an integer from 3 to 50 and R3 is H or an alkyl radical having from 1 to 4 carbon atoms, and
• C2) aliphatic and/or aromatic sulfonic acids of the formula R18—SO3H, where R18 is C6- to C40-alkyl, C6 to C40-alkenyl or an alk(en)ylaryl radical which has 1, 2, 3 or 4 aromatic rings and 1, 2, 3 or 4 alkyl or alkenyl radicals each having from 6 to 40 carbon atoms.