Process for preparing polymers and compositions thereof
AssigneeThe Lubrizol Corporation
InventorsMarina Baum, Barton J. Schober, Mark C. Davies, Daniel C. Visger, John R. Johnson
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Abstract
The present invention provides a process for preparing a polymer, employing the steps of: (1) contacting a free radical initiator; a chain transfer agent containing a thiocarbonyl thio group and a free radical leaving group; and a radically polymerizable monomer, to form a polymer chain; and (2) contacting the polymer chain of step (1) with at least one of a polyvalent coupling agent, a polymerization inhibitor, a grafting acylating agent, an amine and an oil of lubricating viscosity. The invention further provides compositions and uses for the polymer.
Claims20
A composition comprising an oil of lubricating viscosity and 0.1 wt % to 60 wt % a star polymer derived from at least two monomers comprising:
- (a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers;
- and
- (b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer;
- (c) containing 0 wt % styrene;
- and
- (d) optionally containing less than 10 wt % alkyl methacrylamide, wherein the star-polymer has about 7 to about 50 arms present on the star polymer, and wherein the star polymer is prepared by a reversible addition-fragmentation chain transfer controlled radical polymerisation process.
A composition comprising an oil of lubricating viscosity and 0.1 wt % to 60 wt % a star polymer derived from two monomers consisting of:
- (a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers;
- and
- (b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer.
A composition comprising an oil of lubricating viscosity and 0.1 wt % to 60 wt % a star polymer derived from at least two monomers comprising:
- (a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers;
- and
- (b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer;
- (c) containing less than 20 wt % styrene;
- and
- (d) optionally containing less than 10 wt % alkyl methacrylamide, wherein the star-polymer has 16 or more arms present on the star polymer, and wherein the star polymer is prepared by a reversible addition-fragmentation chain transfer controlled radical polymerisation process.
Dependencies are inferred from the claim text.