A process for preparing a random copolymer, the process comprising the steps of (i) preparing a monomer composition comprising: (a) 5 to 55 mol-% of one or more conjugated dienes having 6 carbon atoms or less per molecule; (b) 5 to 45 mol-% of one or more C 1 -C 6 alkyl(meth)acrylates; (c) 10 to 70 mol-% of one or more C 7 -C 24 alkyl(meth)acrylates; (d) 0 to 10 mol-% of one or more esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene; and (e) 0 to 10 mol-% of one or more 1-alkenes comprising 6 to 16 carbon atoms, and (f) 0 to 10 mol-% of monomers selected from the group consisting of styrene monomers having from 8 to 17 carbon atoms, vinyl esters having from 1 to 11 carbon atoms in the acyl group, vinyl ethers having from 1 to 10 carbon atoms in the alcohol group, dispersing oxygen- and/or nitrogen-functionalized monomers, heterocyclic (meth)acrylates, heterocyclic vinyl compounds, monomers containing a covalently bonded phosphorous atom, monomers containing epoxy groups and monomers containing halogens, based on the total amount of monomers in the monomer composition, (ii) providing a reaction mixture including the monomer composition prepared in step (i) and initiating radical polymerization in the reaction mixture to obtain a random copolymer, wherein radical polymerization is performed as solution polymerization and the amount of monomer composition relative to the total weight of the reaction mixture in step (ii) is at least 20 % by weight, wherein the amounts of components (a) to (f) add up to 100 mol-%, based on the total amount of monomers in the monomer composition, and wherein the weight-average molecular weight of the random copolymer is in the range of 7,000 to 30,000 g/mol. (i) preparing a monomer composition comprising: (a) 5 to 55 mol-% of one or more conjugated dienes having 6 carbon atoms or less per molecule; (b) 5 to 45 mol-% of one or more C 1 -C 6 alkyl(meth)acrylates; (c) 10 to 70 mol-% of one or more C 7 -C 24 alkyl(meth)acrylates; (d) 0 to 10 mol-% of one or more esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene; and (e) 0 to 10 mol-% of one or more 1-alkenes comprising 6 to 16 carbon atoms, and (f) 0 to 10 mol-% of monomers selected from the group consisting of styrene monomers having from 8 to 17 carbon atoms, vinyl esters having from 1 to 11 carbon atoms in the acyl group, vinyl ethers having from 1 to 10 carbon atoms in the alcohol group, dispersing oxygen- and/or nitrogen-functionalized monomers, heterocyclic (meth)acrylates, heterocyclic vinyl compounds, monomers containing a covalently bonded phosphorous atom, monomers containing epoxy groups and monomers containing halogens, based on the total amount of monomers in the monomer composition, (a) 5 to 55 mol-% of one or more conjugated dienes having 6 carbon atoms or less per molecule; (b) 5 to 45 mol-% of one or more C 1 -C 6 alkyl(meth)acrylates; (c) 10 to 70 mol-% of one or more C 7 -C 24 alkyl(meth)acrylates; (d) 0 to 10 mol-% of one or more esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene; and (e) 0 to 10 mol-% of one or more 1-alkenes comprising 6 to 16 carbon atoms, and (f) 0 to 10 mol-% of monomers selected from the group consisting of styrene monomers having from 8 to 17 carbon atoms, vinyl esters having from 1 to 11 carbon atoms in the acyl group, vinyl ethers having from 1 to 10 carbon atoms in the alcohol group, dispersing oxygen- and/or nitrogen-functionalized monomers, heterocyclic (meth)acrylates, heterocyclic vinyl compounds, monomers containing a covalently bonded phosphorous atom, monomers containing epoxy groups and monomers containing halogens, based on the total amount of monomers in the monomer composition, (ii) providing a reaction mixture including the monomer composition prepared in step (i) and initiating radical polymerization in the reaction mixture to obtain a random copolymer, wherein radical polymerization is performed as solution polymerization and the amount of monomer composition relative to the total weight of the reaction mixture in step (ii) is at least 20 % by weight, wherein the amounts of components (a) to (f) add up to 100 mol-%, based on the total amount of monomers in the monomer composition, and wherein the weight-average molecular weight of the random copolymer is in the range of 7,000 to 30,000 g/mol. wherein radical polymerization is performed as solution polymerization and the amount of monomer composition relative to the total weight of the reaction mixture in step (ii) is at least 20 % by weight, wherein the amounts of components (a) to (f) add up to 100 mol-%, based on the total amount of monomers in the monomer composition, and wherein the weight-average molecular weight of the random copolymer is in the range of 7,000 to 30,000 g/mol.