C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
253/104, 260/245
C07D 207/408 (2006.01) C08F 8/00 (2006.01) C10L 1/236 (2006.01) C10M 143/02 (2006.01)
Patent
CA 1131221
ABSTRACT OF THE DISCLOSURE Oil-soluble, derivatized ethylene copolymers derived from about 2 to 98 wt.% etyhlene, and one or more C3 to C28 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 amino, 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 C1-C30 hydrocarbon sub- stituted acid, preferably acetic anhydride, to yield an oil-soluble stable amidederivative 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 (?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 multifunctional viscosity index improvers of enhanced sludge dispersant activity. It is preferred to treat these derivatized copolymers with oil-soluble hydrocarbyl substituted acids, preferably with long chain alkylaryl sulfonic acids with an average side chain carbon number of about 20-40, to yield haze-free hydrocarbon concentrate useful as an additive solution for lubricating oils.
343355
Gardiner John B.
Girgenti Salvatore J.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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