| abstract |
The present invention relates to a polymer comprising from 50 to 100% by weight, based on the weight of the polymer, of repeating units derived from one or more ethylenically unsaturated ester compounds of the formula (I) wherein R is hydrogen or methyl, R 1 is a linear or branched alkyl radical having 7 to 30 carbon atoms, R 2 and R 3 are independently hydrogen or a group of the formula -COOR ', wherein R' is hydrogen or an alkyl group having 7 to 30 carbon atoms wherein the polymer is a star polymer having 3 to 21 arms and at least 3 of the arms comprise at least 40% by weight, based on the weight of the arms, of repeat units derived from one or more ethylenically unsaturated ester compounds of formula (1 ) wherein R is hydrogen or methyl, R 1 is a linear or branched alkyl radical having 7 to 30 carbon atoms, R 2 and R 3 are independently hydrogen or a group of the formula -COOR ', wherein R' is hydrogen or an alkyl group having 7 to 30 carbon atoms means are derived. Furthermore, the present invention relates to oil formulations comprising the polymers according to the invention. The polymers of high thickening effect according to the invention can be used in particular as viscosity modifiers, pour point improvers, dispersants and / or friction modifiers. |