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1. CA2248661 - FUNCTIONALIZED OLEFIN COPOLYMER ADDITIVES

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[ EN ]
CLAIMS
We claim:
1. A functionalized olefin copolymer comprising the reaction product of a) an acylated olefin copolymer, b) at least one coupling compound, wherein said coupling compound contains more than one amine, thiol and/or alcohol functionality capable of reacting with the acylated olefin copolymer and c) a performance enhancing compound.
2. The functionalized olefin copolymer of claim 1 wherein the olefin copolymer substrate is selected from copolymers of polymerizable C2 to C23 olefins, hydrogenated random and block copolymers of a vinyl aromatic compound and at least one conjugated diene, or hydrogenated random and block copolymers of mixtures of conjugated dienes.
3. The functionalized olefin copolymer of claim 1 wherein said olefin copolymer has a number average molecular weight of between 700 and about 500,000.
4. The functionalized olefin copolymer of claim 1 wherein the olefin copolymer is a copolymer of ethylene and one or more C3-C23 alpha-olefins.
5. The functionalized olefin copolymer of claim 1 wherein said acylated olefin copolymer comprises an olefin copolymer grafted with from about 0.5 to about 6 molecules of ethylenically unsaturated carboxylic acid, or derivative thereof, per molecule of olefin
copolymer.
6. The functionalized olefin copolymer of claim 1 wherein said coupling compound containing more than one amine, thiol and/or alcohol functionality is selected from the group consisting of organic polyamines, polyalcohols, polyhydroxy or thiol amines, amide-amines and amino guanidines.
7. The functionalized olefin copolymer of claim 1 wherein the performance enhancing compound is selected from the group consisting of monoamines, sterically hindered polyamines, heterocyclic thiols and hydroxyamines.
8. The functionalized olefin copolymer of claim 4 wherein the copolymer of ethylene and one or more C3-C23 alpha-monoolefins is an ethylene-propylene copolymer.
9. The functionalized ethylene copolymer of claim 1 wherein the acylated olefin copolymer is reacted with from 0.5 to 85 mol% coupling compound and 15 to 99.5 mol% performance enhancing compound per mol of acylating agent.
10. An oil concentrate containing, on an active ingredient basis, 20 to 90 weight percent of a carrier or diluent oil and from about 3 to 45 weight percent of the functionalized olefin copolymer of claim 1.
11. The oil concentrate of claim 10 further comprising at least one additive selected from the group consisting of viscosity index improvers, antioxidants, corrosion inhibitors, detergents, dispersants, pour point depressants, antiwear agents, antifoamants, demulsifiers and friction modifiers.
12. A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of the funcitonalized olefin copolymer of claim 1.
13. The lubricating composition of claim 12 further comprising at least one additive selected from the group consisting of viscosity index improvers, antioxidants, corrosion inhibitors, detergents, dispersants, pour point depressants, antiwear agents, antifoamants, demulsifiers and friction modifiers.
14. A fuel composition comprising a major amount of a fuel and a minor amount of the functionalized olefin copolymer of claim 1.
15. The fuel composition of claim 14 further comprising at least one additive selected from the group consisting of anti-knock agents, deposit preventers or modifiers, dyes, cetane improvers, antioxidants, rust inhibitors, gum inhibitors, and metal deactivators.
16. A process for preparing a functionalized olefin copolymer comprising the steps of:
(1) preparing an oil or solvent solution of an acylated olefin copolymer, (2) preparing a solution of at least one performance enhancing compound at a concentration of from 5 to 40 weight percent in surfactant, (3) preparing a solution of at least one coupling compound at a concentration of from 5 to 40 weight percent in surfactant, wherein said coupling compound contains more than one amino, hydroxy and/or thiol group capable of reacting with the carboxylic group of the acylated olefin copolymer, and mixing and heating the solutions (1), (2) and (3) in any order or simultaneously at a temperature of 120° to 200°C for a time sufficient to effect reaction of the amino, hydroxy or thiol group of the performance enhancing compound and the coupling compound with the carboxylic group of the acylated olefin copolymers and to effect coupling of at least two acylated olefin copolymers.
17. The process of claim 16 wherein (a) solutions (1) and (2) are mixed and heated at a temperature of 120° to 200°C for a time sufficient to effect reaction of the amino, hydroxy or thiol group of the performance enhancing compound with the carboxylic group of the acylated olefin copolymers, then (b) the resulting reaction solution of (a) is mixed with (3) and heated at a temperature of 120° to 200°C for a time sufficient to effect coupling of at least two acylated olefin polymers.
18. The process of claim 16 wherein (1), (2) and (3) are simultaneously mixed and heated at a temperature of from 120°C to 200°C for a time sufficient to couple at least two acylated
olefin copolymers via their carboxylic groups and to react excess carboxylic groups with the performance enhancing compound.
19. The process of claim 16 wherein the olefin copolymer used in preparing the acylated and functionalized olefin copolymers has a number average molecular weight of from 700 to 500,000.
20. The process of claim 16 wherein the acylated olefin copolymer contains 0.5 to 6 molecules of carboxylic reactant per molecule olefin copolymer.
21. The process of claim 16 wherein the olefin copolymer substrate is selected from copolymers of polymerizable C2 to C23 olefins, hydrogenated random and block copolymers of a vinyl aromatic compound and at least one conjugated diene, or hydrogenated random and block copolymers of mixtures of conjugated dienes.
22. The process of claim 16 wherein said coupling compound containing more than one amine, thiol and/or hydroxy functionality is selected from the group consisting of organic polyamines, polyalcohols, polyhydroxy or thiol amines, amide-amines and amino guanidines.
23. The process of claim 16 wherein the performance enhancing compound is selected from the group consisting of monoamines, sterically hindered polyamines, heterocyclic thiols and
hydroxyamines.
24. The process of claim 16 wherein the surfactant is selected from the reaction products of aliphatic and aromatic hydroxy compounds with ethylene oxide, propylene oxide or mixtures thereof.
25. A process for preparing a functionalized olefin copolymer comprising the steps of reacting an acylated olefin copolymer having a number average molecular weight of from 700 to 500,000 and having 0.5 to 6 molecules of carboxylic reactant per molecule olefin copolymer with a performance enhancing compound and a coupling compound at a temperature in the range of 120° to 200°C, wherein the reaction of the acylated olefin polymer with the coupling compound is before, after or simultaneous with reaction of the performance enhancing compound and the acylated olefin copolymer.