| 摘要 |
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. |
