| abstract |
This invention concerns copolymers, which are obtainable by ATRP methods, where a mixture of ethylenically unsaturated monomers consisting ofa) 0 to 40% by weight of one or more ethylenically unsaturated ester compounds of formula (I)where R is hydrogen or methyl, R1 means a linear or branched alkyl residue with 1 to 5 carbon atoms, R2 and R3 independently represent hydrogen or a group of the formula -COOR', where R' means hydrogen or an alkyl group with 1 to 5 carbon atoms,b) 10 to 98% by weight of one or more ethylenically unsaturated ester compounds of formula (II)where R is hydrogen or methyl, R4 means a linear or branched alkyl residue with 6 to 15 carbon atoms, R5 and R6 independently are hydrogen or a group of the formula -COOR'', where R'' means hydrogen or an alkyl group with 6 to 15 carbon atoms,c) 0 to 80% by weight of one or more ethylenically unsaturated ester compounds of formula (III)where R is hydrogen or methyl, R7 means a linear or branched alkyl residue with 16 to 30 carbon atoms, R8 and R9 independently are hydrogen or a group of the formula -COOR''' where R''' means hydrogen or an alkyl group with 16 to 30 carbon atoms,d) 0 to 50% by weight comonomer, where the indication of % by weight in each case refers to the total weight of the ethylenically unsaturated monomers.The new copolymers are used as pour point depressants. |