Highly grafted, multi-functional olefin copolymer VI modifiers
AssigneeEthyl Corporation
InventorsJoseph J. Valcho, Mark Rees, Peter Growcott, Mark Thomas Devlin, Errol J. Olivier
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Abstract
A novel additive comprising a highly grafted, multi-functional olefin copolymer comprising a graft and amine-derivatized copolymer prepared from ethylene and at least one C.sub.3 to C.sub.23 alpha-monoolefin and, optionally, a polyene, wherein the copolymer of ethylene and at least one C.sub.3 to C.sub.23 alpha-monoolefin has grafted thereon from 0.3 to 0.75 carboxylic groups per 1000 number average molecular weight units of olefin copolymer and wherein the olefin copolymer has a number average molecular weight of between 20,000 and 150,000, and lubricating oil concentrates and compositions containing the same are provided.
Claims12
A highly grafted, multi-functional olefin copolymer viscosity modifier comprising the reaction product of an acylated olefin copolymer and a polyamine, wherein the acylated olefin copolymer comprises an olefin copolymer having grafted thereon from 0.3 to 0.75 carboxylic groups per 1000 number average molecular weight units of olefin copolymer and wherein the olefin copolymer has a number average molecular weight of between about 40,000 and 150,000, wherein the polyamine is selected from the group consisting of:
- (a) an N-arylphenylenediamine represented by the formula:
- ##STR15## in which R.sup.1 is hydrogen, --NH-aryl, --NH-arylalkyl, --NH-alkyl, or a branched or straight chain radical having from 4 to 24 carbon atoms that can be alkyl, alkenyl, alkoxyl aralkyl, alkaryl, hydroxyalkyl or aminoalkyl;
- R.sup.2 is --NH.sub.2, CH.sub.2 --(CH.sub.2).sub.n --NH.sub.2, CH.sub.2 -aryl-NH.sub.2, in which n has a value from 1 to 10;
- and R.sup.3 is hydrogen, alkyl, alkenyl, alkoxyl, aralkyl, alkaryl having from 4 to 24 carbon atoms;
- (b) an aminothiazole from the group consisting of aminothiazole, aminobenzothiazole, aminobenzothiadiazole and aminoalkylthiazole;
- (c) an aminocarbazole represented by the formula:
- ##STR16## in which R and R.sup.1 represent hydrogen or an alkyl, alkenyl, or alkoxy radical having from 1 to 14 carbon atoms;
- (d) an aminoindole represented by the formula:
- ##STR17## in which R represents hydrogen or an alkyl radical having from 1 to 14 carbon atoms;
- (e) an aminopyrrole represented by the formula:
- ##STR18## in which R is a divalent alkylene radical having 2 to 6 carbon atoms and R.sup.1 is hydrogen or an alkyl radical having from 1 to 14 carbon atoms;
- (f) an amino-indazolinone represented by the formula:
- ##STR19## in which R is hydrogen or an alkyl radical having from 1 to 14 carbon atoms;
- (g) an aminomercaptotriazole represented by the formula:
- ##STR20## in which R can be absent or is a C.sub.1 -C.sub.10 linear or branched hydrocarbon selected from the group consisting of alkyl, alkenyl, arylalkyl or aryl;
- (h) an aminoperimidine represented by the formula:
- ##STR21## in which R represents hydrogen or an alkyl or alkoxyl radical having from 1 to 14 carbon atoms;
- (i) aminoalkyl imidazoles selected from the group consisting of 1-(2-aminoethyl) imidazole and 1-(3-aminopropyl) imidazole, and
- (j) 4-(3-aminopropyl) morpholine.
Dependencies are inferred from the claim text.