| 摘要 |
The present invention provides a method for making a viscosity index improving copolymer, which comprises heating a reaction mixture comprising from about 55 weight percent to about 99.5 weight percent of one or more first monomer selected from the group consisting of (C8-C15)alkyl (meth)acrylates and mixtures thereof, from about 0.5 weight percent to about 45 weight percent of one or more second monomer selected from the group consisting of (C1-C7)alkyl (meth)acrylates, (C16-C24)alkyl(meth)acrylates and mixtures thereof, a polymerization initiator and a hydrocarbon diluent, to a reaction temperature from about 75 DEG C to about 100 DEG C and maintaining the reaction mixture at the reaction temperature for a period of time effective to allow copolymerization of the monomers. |
