Process for making a viscosity index improving copolymer

Details Process for making a viscosity index improving copolymer Process for making a viscosity index improving copolymer

C - Chemistry, Metallurgy

08

F

C08F 220/16 (2006.01) C08F 212/08 (2006.01) C08F 220/18 (2006.01) C08L 25/14 (2006.01) C08L 33/06 (2006.01) C10M 145/14 (2006.01)

Patent

CA 2146604

A method for making viscosity index improving copolymer includes polymerizing a monomer mixture including a first (meth)acrylate monomer, a second (meth)acrylate monomer and a styrenic monomer in an oil soluble diluent and in the presence of a polymerization initiator to form a polymerization intermediate and then polymerizing an additional amount of the first (meth)acrylate monomer, the second (meth)acrylate monomer or a mixture thereof in the presence of the polymerization intermediate to provide a solution of a viscosity index improving copolymer in the diluent wherein the solution includes less than or equal to 1000 parts by weight residual styrene monomer per one million parts by weight solution.

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