Use of polymeric additives for paraffin-containing fluids

A method for reducing the pour point of a paraffin-containing fluid, comprising adding to a paraffin-containing fluid a polymer comprising the following building blocks:

• wherein
• and —R2 are, independent from each other, a C12- to C36- alkyl group;
• the alkyl groups being a mixture of branched and linear, the ratio of the linear alkyl groups to the branched alkyl groups is in the range from 95:5 to 5:95 (weight % :
• weight %),
• at least 90% of the number of the building blocks are a) and b), relative to the total number of all building blocks incorporated in the polymer;
• and
• the building blocks a) and b) are, relative to each other, present in the polymer in a ratio of from 80:20 to 20:80 (number:number);
• wherein the paraffin-containing fluid is a crude oil, a petroleum oil, a shale oil, a tar sands oil, or mixtures thereof;
• and
• wherein 20 to 2000 ppm (weight:weight) of the polymers are used in the paraffin-containing fluid.