| 摘要 |
This invention is concerned with a polymer useful as an ashless dispersant additive which provides a combination of dispersancy, good cold cranking engine start-up, low-temperature viscosity properties and neutral behaviour towards fluoropolymer engine seal materials, and is obtainable by polymerising one or more alkyl methacrylate with one or more hydroxy-alkyl methacrylate while controlling the relative weight ratio of the component monomers to obtain an appropriate carbon atom content in the alkyl side chain portion of the methacrylate backbone polymer to achieve desired additive solubility properties. |
