Hydrogenated lithiated copolymers grafted with organic nitrogen compounds as viscosity index improvers having dispersant properties
US4145298A · kind A · utility
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52Claims
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Key dates
| Filing date | Aug 22, 1977 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Aug 22, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Nitrogen-containing copolymers are prepared by the reaction of lithiated hydrogenated conjugated diene-monovinylarene copolymers with nitrogen-containing organic compounds. The nitrogen-containing copolymers are oil additives which combine the aspects of viscosity index improvers with dispersant properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.