| abstract |
The present invention describes a copolymer having at least one nonpolar segment P and at least one polar segment D and comprising an ester group. That is, in this case, the polar segment D has at least 8 repeating units, the mass proportion of the dispersible repeating units in the polar segment D is at least 30% of the mass of the polar segment D, and the co-polymer containing this ester group The coalescence is obtained by NMP (nitroxide mediated polymerization). In addition, the present invention describes a lubricating oil comprising the above copolymer and having improved frictional properties. |