Dispersant viscosity modifiers
US8778854B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2010 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Mar 20, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The disclosed invention relates to a composition comprising a grafted polymer. The polymer comprises a backbone with at least one olefin block and at least one vinyl aromatic block. The polymer is grafted with a pendant carbonyl containing group, the grafting being conducted by halogenating the vinyl aromatic carbon of the vinyl aromatic block and then grafting a carboxylic acid or derivative thereof on the halogenated vinyl aromatic carbon in the presence of an activating agent. The carbonyl containing-group is optionally substituted to provide ester, imide and/or amide functionality. The grafted polymer is useful as a dispersant viscosity modifier in lubricating compositions such as engine oils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.