Mixed dispersants for lubricants
US7615521B2 · kind B2 · utility
24Cited by
21References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2004 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Nov 6, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/252
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A dispersant composition comprising the product of an amine, an alcohol, or an amino alcohol, with a hydrocarbyl-substituted succinic anhydride component exhibits improved viscosity stability and reduced chlorine content, when the hydrocarbyl-substituted succinic anhydride component comprises: (a) 10 to 95 weight percent of a component prepared by reacting a polyisobutylene with maleic anhydride in the presence of chlorine; and (b) 5 to 90 weight percent of a component prepared by reacting a polyisobutylene with maleic anhydride in the substantial absence of chlorine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.