Process for making a viscosity index improving copolymer
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United States of America Patent
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May 8, 2001
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N/A
app pub date -
Apr 14, 1994
filing date -
Apr 14, 1994
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Expired
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Abstract
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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