Dispersant-viscosity improvers for lubricating oil compositions
First Claim
1. A dispersant-viscosity improver for lubricating oil compositions comprising the reaction product of reactants comprising(a) an ethylene copolymer selected from the group consisting of an oil soluble ethylene-alpha olefin copolymer and an ethylene-lower olefin-diene copolymer, wherein the alpha olefin is selected from the group consisting of C3-28 alpha olefins, said polymer having a number average molecular weight ranging from about 30,000 to about 300,000, grafted with an ethylenically unsaturated carboxylic acid or functional derivative thereof;
- (b-1) at least one polyester containing at least one condensable hydroxyl group; and
(b-2) at least one polyamine having at least one condensable primary or secondary amino group.
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Abstract
Dispersant-viscosity improvers for lubricating oil compositions comprise the reaction product of reactants comprising
(a) an oil soluble ethylene-alpha olefin copolymer wherein the alpha olefin is selected from the group consisting of C3-28 alpha olefins, said polymer having a number average molecular weight ranging from about 30,000 to about 300,000 grafted with an ethylenically unsaturated carboxylic acid or functional derivative thereof;
(b-1) at least one polyester containing at least one condensable hydroxyl group; and
(b-2) at least one polyamine having at least one condensable primary or secondary amino group, and optionally further comprising (c) at least one hydrocarbyl substituted carboxylic acid or anhydride.
24 Citations
51 Claims
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1. A dispersant-viscosity improver for lubricating oil compositions comprising the reaction product of reactants comprising
(a) an ethylene copolymer selected from the group consisting of an oil soluble ethylene-alpha olefin copolymer and an ethylene-lower olefin-diene copolymer, wherein the alpha olefin is selected from the group consisting of C3-28 alpha olefins, said polymer having a number average molecular weight ranging from about 30,000 to about 300,000, grafted with an ethylenically unsaturated carboxylic acid or functional derivative thereof; -
(b-1) at least one polyester containing at least one condensable hydroxyl group; and (b-2) at least one polyamine having at least one condensable primary or secondary amino group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 44, 46, 48, 50)
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23. The dispersant-viscosity improver of claim 1 wherein the polyamine (b-2) is selected from the group consisting of diethylenetriamine, triethylene tetramine, tetraethylenepentamine, pentaethylenehexamine, polyamine bottoms and mixtures thereof.
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24. The dispersant-viscosity improver of claim 1 wherein (b-1) is a polyester of hydrocarbon-substituted monocarboxylic and dicarboxylic acids, said hydrocarbon substituent containing from 5 to about 500 carbon atoms.
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25. The dispersant-viscosity improver of claim 1 wherein the polyester is derived from an aliphatic hydrocarbon substituted succinic acid containing from about 16 to about 100 carbon atoms in the aliphatic hydrocarbon substituent.
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26. The dispersant-viscosity improver of claim 25 wherein the polyester is derived from at least one polyol selected from the group consisting of pentaerythritol, 2-ethyl-2-hydroxymethyl-1,3-propanediol, sorbitol, glycerol, a polyetherpolyol, 2-ethyl-2-amino-1,3-propanediol, tris-hydroxymethyl aminomethane, triethanolamine, diethanolamine, and mixtures of two or more of these.
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27. The dispersant-viscosity improver of claim 1 wherein the ethylenically unsaturated carboxylic acid or functional derivative thereof, is an alpha, beta-unsaturated carboxylic acid or functional derivative thereof containing from 2 to about 20 carbon atoms exclusive of carbonyl carbons.
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28. The dispersant-viscosity improver of claim 27 wherein the ethenylically unsaturated carboxylic acid or functional derivative thereof, comprises at least one member of the group consisting of maleic acid, maleic anhydride, fumaric acid, itaconic acid and itaconic anhydride and esters of the acids.
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44. An additive concentrate comprising an inert normally liquid organic diluent and from about 5 to about 40 percent by weight of the dispersant-viscosity improver of claim 1.
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46. The additive concentrate of claim 44 further comprising from about 1% to about 5% by weight of at least one pour point depressant selected from the group consisting of polymethacrylates, alkylated naphthalenes and maleate/vinyl acetate copolymers.
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48. A lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of the dispersant-viscosity improver of claim 1.
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50. A lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of the additive concentrate of claim 44.
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29. An oil soluble or dispersible composition comprising the reaction product of reactants comprising
(a) an oil soluble copolymer of ethylene with at least one comonomer, wherein at least one of the comonomers is selected from the group consisting of C3-28 alpha-olefins, said copolymer having a number average molecular weight ranging from about 30,000 to about 300,000, grafted with an alpha-beta ethylenically unsaturated carboxylic acid or functional derivative thereof; -
(b-1) a polyisobutenyl substituted succinic polyester which contains an average of at least one free hydroxyl group per mole of succinic groups; and (b-2) an alkylene polyamine having the formula
space="preserve" listing-type="equation">H.sub.2 N--(alkylene-NR).sub.n --Hwherein n is a number from 1 to about 10, each R is independently hydrogen, a hydrocarbyl group having from 1 to about 30 carbon atoms or a group of the formula ##STR4## wherein each x is independently 0 or a number from 1 to about 5, and said alkylene group contains from 2 to about 10 carbon atoms. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 47, 49, 51)
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Specification