C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 297/02 (2006.01) C08F 297/04 (2006.01) C08G 81/02 (2006.01) C10M 143/08 (2006.01) C10M 143/10 (2006.01) C10M 143/12 (2006.01) C10M 143/14 (2006.01)
Patent
CA 2082331
T 4823 FF A B S T R A C T STAR POLYMERS, A PROCESS FOR THEIR PREPARATION AND LUBRICATING OIL COMPOSITIONS AND CONCENTRATES CONTAINING THEM The present invention provides star polymers, useful as lubricating oil viscosity index improvers, produced by the process comprising the steps of: (a) anionically polymerising isoprene and styrene to produce block copolymer molecules, each block copolymer molecule having an A-B structure wherein B is a block of polyisoprene having a number average molecular weight (MWI) in the range from 30,000 to 70,000 and A is a block of polystyrene having a number average molecular weight (MWS) in the range from 4,000 - (MWI/30) to 3000 + (MWI/30); (b) coupling the block copolymer molecules with 2.5 or more moles of polyalkenyl coupling agent per mole of block copolymer molecules, to form a star polymer; and (c) selectively hydrogenating the star polymer such that at least 95% of isoprene units (olefinic unsaturation) and less than 15% of styrene units (aromatic unsaturation) are hydrogenated; a process for their preparation; and lubricating oil compositions and lubricating oil concentrates containing them. PS25/T4823FF.DOC
Atwood Harvey E.
Gorman John E.
Rhodes Robert B.
Shell Canada Limited
Smart & Biggar
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