Copolymers, their mixtures with polymers of esters of (meth)acrylic acid, and their use in improving the flowability of crude oil at a low temperature

摘要

Copolymers comprising from 50 to 99.9 % by weight of a C14-C22-alkyl (meth)acrylate and from 50 to 0.1 % by weight of a comonomer of the formula I IMAGE where R1 is hydrogen or methyl and R2 is a group of the formula IMAGE R3 is C1-C80-alkyl, C2-C80-alkenyl, C5- or C6-cycloalkyl or cycloalkenyl, which may be substituted by alkyl groups, aralkyl, alkaryl or the radical of a dimeric fatty acid, maleic acid, succinic acid or a C6-C22-alkenylsuccinic acid, R4 is C1-C80-alkyl, C1-C80-alkenyl, C5- or C6-cycloalkyl or cycloalkenyl, which may be substituted by alkyl groups, aralkyl or alkaryl, R5 is C6-C20-alkyl, m is 2 or 3, n is a number from 1 to 30, and x is a number from 2 to 20, and mixtures of these copolymers with poly(C14-C22-alkyl (meth)acrylates) are highly suitable for improving the flowability of crude oils. Such copolymers also include those which contain a comonomer of the formula 1 in which R2 is additionally a group of the formula IMAGE