Treatment of a hydrogenated polymer solution after hydrogenation catalyst removal to improve subsequent lithiation reaction
US4471099A · kind A · utility
13Cited by
14References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1983 |
| Grant date | Sep 11, 1984 |
| Priority date | — |
| Expiry date | Mar 7, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2217/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the preparation of nitrogen-containing dispersant viscosity index improvers and/or gasoline detergent additives wherein a polymer cement is hydrogenated, an alkaline wash step following hydrogenation catalyst removal reduces residual poisons such that subsequent lithiation is improved. The lithiated copolymer thereafter is treated with various nitrogen-containing compounds reactive with the lithiated sites.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.