- 61 -ABSTRACT LUBRICATING OIL COMPOSITION COMPRISING POLYALKYL (METH)ACRYLATE COPOLYMERSThe present invention relates to copolymers obtainable by polymerizing a monomer composition composed of a) 0% to 40% by weight of one or more ethylenically unsaturated ester compounds of the formula (I) in which R is hydrogen or methyl, R1 is a linear or branched alkyl radical having 1 to 5 carbon atoms, R2 and R3 independently are hydrogen or a group of the formula -COOR', in which R1 is hydrogen or an alkyl group having 1 to 5 carbon atoms, b) 10% to 99.9% by weight of one or more ethylenically unsaturated ester compounds of the formula (II) in which R is hydrogen or methyl, R4 is a linear or branched alkyl radical having 6 to 15 carbon atoms, R5 and R6 independently are hydrogen or a group of the formula -COOR', in which R' is hydrogen or an alkyl group having 6 to 15 carbon atoms, c) 0% to 80% by weight of one or more ethylenically unsaturated ester compounds of the formula (III) in which R is hydrogen or methyl, 12.2 is a linear or branched alkyl radical having 16 to 30 carbon atoms, R8 and R9 independently are hydrogen or a group of the formula -COOR", in which R" is hydrogen or an alkyl group having 16 to 30 carbon atoms, d) 0.1% to 30% by weight of one or more ethylenically unsaturated, polar ester compounds of the formula (IV) in which R is hydrogen or methyl, X is oxygen, sulphur or an amino group of the formula -NH- or -NR"-, in which Ra is an alkyl radical having 1 to 40 carbon atoms, RI° is a radical which encompasses 2 to 1000 carbon atoms and has at least 2 heteroatoms, R11 and R12 independently are hydrogen or a group of the formula -COX'Ricr, in which X' is oxygen or an amino group of the formula -NH- or NRa, in which Rai is an alkyl radical having 1 to 40 carbon atoms, and R10' is a radical which encompasses 1 to 100 carbon atoms, and e) 0% to 50% by weight of comonomer, based in each case on the total weight of the ethylenically unsaturated monomers.
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