Polymeric additives for fuels and lubricants
US4144181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Apr 29, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Oil-soluble, derivatized ethylene copolymers derived from about 2 to 98 wt. % ethylene, and one or more C.sub.3 to C.sub.28 alpha-olefins, e.g. propylene, which are grafted, preferably solution-grafted under an inert atmosphere and at elevated temperatures and in the presence of a high-temperature decomposable free-radical initiator, with an ethylenically-unsaturated carboxylic acid material and thereafter reacted with a polyfunctional material reactive with carboxy groups; such as (a) a polyamine, or (b) a polyol, or (c) a hydroxy amine, or mixtures thereof to form carboxyl-grafted polymeric derivatives are reacted with oil-soluble hydrocarbyl substituted acids, preferably with long chain alkyl aryl sulfonic acids with an average side chain carbon number of about 20-40, to yield haze-free hydrocarbon solutions, e.g. a lubricant additives composition, of increased dispersant potency. Useful number average molecular weight (M.sub.n) of said copolymers range from about 700 to 500,000, however, if the molecular weight is from 10,000 to 500,000 then these copolymers are also useful as multifunctional viscosity index improvers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.