Dispersant additive
US6255258A · kind A · utility
4Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Nov 2, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An oil-soluble dispersant obtainable by reacting the reaction product of a polyamine and a long-chain hydrocarbyl-substituted dicarboxylic acid, anhydride or ester thereof with a polyanhydride, characterized in that the dispersant restricts the viscosity increase in an oil to below 8 Pa.s in the Haake rheology test defined herein at 2% w/w active matter and a shear rate of 0.26 s.sup.-1 Pa.s, and lubricating oil and fuel compositions and additive concentrates containing such a dispersant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.