COPOLYMERS, MIXTURES THEREOF WITH POLY(METH)ACRYLATE ESTERS AND THE USE THEREOF FOR IMPROVING THE COLD FLUIDITY OF CRUDE OILS

- ? New copolymers, mixtures thereof with poly(meth)acrylate esters and the use thereof for improving the cold fluidity of crude oils Copolymers and the use thereof for improving the fluidity of crude oils. Copolymers of 50 to 99.9% by weight of a C14-C22-alkyl (meth)acrylate and 50 to 0.1% by weight of a comonomer of the formula 1 (1) in which R1 is hydrogen or methyl, R2 is a group of the formulae , , , , , -CH2-O-C2HF3 , or , R3 is C1-C80-alkyl, C2-C80-alkenyl, C5- or C6-cycloalkyl or -cycloalkenyl which can each be substituted by alkyl groups, or is aralkyl, alkaryl or the radical of a dimeric fatty acid, of maleic acid, of succinic acid or of a C6-C22-alkenylsuccinic acid, R4 is C1-C80-alkyl, C1-C80-alkenyl, C5- or C6-cycloalkyl or -cycloalkenyl which can each be substituted by alkyl groups, or is aralkyl or alkaryl, R5 is C6-C20 -alkyl, - ? m is 2 or 3, n is a number from 1 to 30 and is a number from 2 to 20, and mixtures of such a copolymer with C14-C22-alkyl poly(meth)acrylates. These copolymers or their mixtures with C14-C22-alkyl poly(meth)acrylates are outstandingly suitable for improving the fluidity of crude oils. Those copolymers are also included here which contain a comonomer of the formula 1 in which R2 additionally can also be a group of the formula , or