Viscosity-index improvers

Details Viscosity-index improvers Viscosity-index improvers

C - Chemistry, Metallurgy

08

F

C08F 297/02 (2006.01) C08F 8/04 (2006.01) C08F 8/30 (2006.01) C08F 8/32 (2006.01) C10M 143/10 (2006.01) C10M 143/12 (2006.01) C10M 145/08 (2006.01) C10M 145/14 (2006.01) C10M 149/02 (2006.01)

Patent

CA 2111790

The invention provides polymers comprising: at least 3 first arms, each arm comprising a hydrogenated, polymerised conjugated diene and having a peak molecular weight from 10,000 to 200,000; at least 3 second arms, each arm comprising a polymerised methacrylate and/or amide or imide derivative thereof and having a peak molecular weight from 500 to 10,000; and a central core comprising a polymerised bisunsaturated monomer, wherein the central core connects the first and second arms in a star configuration; a process for their preparation; lubricating oil compositions containing them; and their use as viscosity-index improver additives.

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