US 9,809,780 B2
Process for preparing polymers and compositions thereof
Marina Baum, Chagrin Falls, OH (US); Barton J. Schober, Perry, OH (US); Mark C. Davies, Belper (GB); Daniel C. Visger, Mentor, OH (US); and John R. Johnson, Euclid, OH (US)
Assigned to The Lubrizol Corporation, Wickliffe, OH (US)
Filed by The Lubrizol Corporation, Wickliffe, OH (US)
Filed on Jul. 8, 2013, as Appl. No. 13/936,445.
Application 13/936,445 is a continuation of application No. 11/577,769, granted, now 8,513,172, previously published as PCT/US2005/038138, filed on Oct. 21, 2005.
Claims priority of provisional application 60/621,745, filed on Oct. 25, 2004.
Prior Publication US 2013/0310291 A1, Nov. 21, 2013
Int. Cl. C10M 145/14 (2006.01); C08F 2/38 (2006.01); C08F 293/00 (2006.01); C08L 53/00 (2006.01); C10M 177/00 (2006.01)
CPC C10M 145/14 (2013.01) [C08F 2/38 (2013.01); C08F 293/005 (2013.01); C08L 53/00 (2013.01); C10M 177/00 (2013.01); C08F 2438/03 (2013.01); C10M 2209/084 (2013.01); C10M 2217/023 (2013.01); C10M 2217/024 (2013.01); C10M 2217/028 (2013.01); C10N 2220/021 (2013.01); C10N 2220/029 (2013.01); C10N 2230/02 (2013.01); C10N 2230/04 (2013.01); C10N 2230/08 (2013.01); C10N 2230/68 (2013.01); C10N 2240/04 (2013.01); C10N 2240/042 (2013.01); C10N 2240/044 (2013.01); C10N 2240/08 (2013.01); C10N 2240/10 (2013.01); C10N 2270/00 (2013.01)] 20 Claims
 
1. 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.