Succinimide derivatives and processes for their preparation
US5286873A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | May 12, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for producing a lubricating oil dispersant additive comprises: step (1) reacting compound (A), wherein compound (A) is a hydrocarbyl-substituted or a substituted hydrocarbyl-substituted succinic acid or anhydride or ester thereof, with compound (B) of formula (I) EQU H.sub.2 N(CHR.sup.1 CHR.sup.2 O).sub.n CHR.sup.3 CHR.sup.4 NH.sub.2(I) wherein one of R.sup.1 and R.sup.2 is hydrogen and the other is hydrogen or a lower alkyl group and n is an integer from 1 to 10 and one of R.sup.3 and R.sup.4 is hydrogen and the other is hydrogen or a lower alkyl group, each of the --(CHR.sup.1 CHR.sup.2 O)-- units being independently defined, to give a product (C) and step (2) reacting product (C) with a diisocyanate (D) of formula (II) EQU OCN--R.sup.5 --NCO (II) wherein R.sup.5 is a divalent organic group. Novel succinimides have been prepared by the disclosed process, lubricating oil compositions comprise 1-20% w/w of the modified succinimides. The succinimides have dispersancy and VI improver properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.