Stabilized amide-imide graft of ethylene copolymeric additives for lubricants
US4219432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1979 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Feb 14, 1999 |
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 dicarboxylic acid material and thereafter firstly reacted with from 0.1 to 0.9 molar equivalents of a t-amino-amine compound containing only one primary amino group to form imido groups and then secondly reacted with from 0.1 to 0.9 molar equivalents of a .alpha.,.omega. primary diamine having at least two primary amine groups, e.g. a poly(alkylene amine) such as diethylene triamine, to form carboxyl-grafted polymeric imide, usually succinimide, intermediate and thirdly reacted with an anhydride of a C.sub.1 -C.sub.30 hydrocarbon substituted acid, preferably acetic anhydride, to yield an oil-soluble stable amide derivative of said polyamine whereby oil solutions of said amide derivative are characterized by minimal viscosity change over an extended period of time. Useful number average molecular weight (M.sub.n) of sai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.