Method of making a copolymer useful as viscosity index...

Details Method of making a copolymer useful as viscosity index... Method of making a copolymer useful as viscosity index...

C - Chemistry, Metallurgy

08

F

C08F 220/18 (2006.01) C10M 145/12 (2006.01) C10M 145/14 (2006.01)

Patent

CA 2121705

A method for making a viscosity index improving copolymer includes heating a reaction mixture including from about 55 weight percent to about 99.5 weight percent of a 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 a 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°C to about 100°C and maintaining the reaction mixture at the reaction temperature for a period of time effective to allow copolymerization of the monomers.

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