Patent ID: 8123930

Claim:
A crude oil or product which has been produced therefrom and comprises distillation residues, comprising an alkylphenol-aldehyde resin having a repeat structural unit of the formula where R 1 is a branched alkyl or alkenyl radical which has from 10 to 40 carbon atoms and bears at least one carboxyl or carboxylate or ester group, which is bonded to the aromatic system via a secondary carbon atom of the alkyl or alkenyl chain, R 2 is hydrogen or R 1 R 3 is hydrogen or an alkoxy group of the formula -(A-O) m —H, A is a C 2 - to C 4 -alkylene group, m is from 1 to 100, R 4 is hydrogen, a C 1 - to C 11 -alkyl radical or a carboxyl group, R 5 is C 1 -C 200 -alkyl or -alkenyl, O—R 6 , R 6 is C 1 -C 200 -alkyl or -alkenyl, n is from 1 to 100 and k is 1 or 2.