The invention relates to a copolymer comprising (a) 30 to 95.5 wt.% of ethylene; (b) 4 to 40 wt.% of at least one vinyl ester of C2-6 monocarboxylic acids; (c) 0.5 to 30 wt.% of at least one (meth)acrylate of the general formula (I), the radicals having the meaning given in the description; (d) 0 to 10 wt.% of at least one monomer which can be polymerised with the monomers (a) to (c). The invention also relates to the use of said copolymer as a flow improver.