Lubricating compositions and concentrates
US5490945A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1994 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Apr 28, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02F7/006
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A lubricating oil composition is described which comprises a major amount of an oil of lubricating viscosity and (A) at least about 1% by weight of at least one carboxylic derivative composition produced by reacting PA1 (A-1) at least one substituted succinic acylating agent containing at least about 50 carbon atoms in the substituent with PA1 (A-2) from about 0.5 equivalent up to about 2 moles, per equivalent of acylating agent (A-1), of at least one amine compound characterized by the presence within its structure of at least one HN< group; and (B) an amount of at least one alkali metal overbased salt of a carboxylic acid or a mixture of a carboxylic acid and an organic sulfonic acid sufficient to provide at least about 0.002 equivalent of alkali metal per 100 grams of the lubricating oil composition provided that when the alkali metal salt comprises a mixture of overbased alkali metal salts of a hydrocarbyl-substituted carboxylic acid and a hydrocarbyl-substituted sulfonic acid, then the carboxylic acid comprises more than 50% of the acid equivalents of the mixture; and either PA1 (C-1) at least one magnesium overbased salt of an acidic organic compound having a metal ratio of a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.