Heterocyclic amine terminated, lactone modified, aminated viscosity modifiers of improved dispersancy

• US 4,866,135 A
• Filed: 10/07/1986
• Issued: 09/12/1989
• Est. Priority Date: 10/07/1986
• Status: Expired due to Fees

• Current Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Original Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Gutierrez, Antonio, Lundberg, Robert D.
• Primary Examiner(s): Smith, Edward J.
• Application Number:
  US06/916,287
• Time in Patent Office: 1,071 Days
• Field of Search: 525/285, 525/375, 525/301, 560/196, 560/198, 564/159
• US Class Current: 525/285
• CPC Class Codes: C08F 210/16 Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
• CPC Class Codes: C08F 2800/20 as weight or mass percentages
• CPC Class Codes: C08F 8/30 Introducing nitrogen atoms or nitrogen-containing groups
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• CPC Class Codes: C10L 1/221 compounds of uncertain formula; reaction products where mixtures of compounds are obtained
• CPC Class Codes: C10M 143/00 Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
• CPC Class Codes: C10M 143/02 Polyethene
• CPC Class Codes: C10M 143/12 containing conjugated diene
• CPC Class Codes: C10M 145/16 polycarboxylic
• CPC Class Codes: C10M 149/10 containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
• CPC Class Codes: C10M 149/12 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C10M 2205/00 Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
• CPC Class Codes: C10M 2205/02 containing acyclic monomers
• CPC Class Codes: C10M 2205/022 Ethene
• CPC Class Codes: C10M 2205/06 containing conjugated dienes
• CPC Class Codes: C10M 2209/086 polycarboxylic, e.g. maleic acid
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/26 Amines
• CPC Class Codes: C10M 2217/028 containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
• CPC Class Codes: C10M 2217/04 : Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C10M 2217/042 : between the nitrogen-containing monomer and an aldehyde or ketone
• CPC Class Codes: C10M 2217/043 : Mannich bases
• CPC Class Codes: C10M 2217/044 : Polyamides
• CPC Class Codes: C10M 2217/045 : Polyureas; Polyurethanes
• CPC Class Codes: C10M 2217/046 : Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
• CPC Class Codes: C10M 2217/06 : Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2223/045 : Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2040/02 : Bearings
• CPC Class Codes: C10N 2040/04 : Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/042 : for automatic transmissions
• CPC Class Codes: C10N 2040/044 : for manual transmissions
• CPC Class Codes: C10N 2040/046 : for traction drives
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/251 : Alcohol fueled engines
• CPC Class Codes: C10N 2040/252 : Diesel engines
• CPC Class Codes: C10N 2040/253 : Small diesel engines
• CPC Class Codes: C10N 2040/255 : Gasoline engines
• CPC Class Codes: C10N 2040/28 : Rotary engines
• CPC Class Codes: C10N 2070/02 : Concentrating of additives

Abstract

Polymer C₅ -C₉ derivatives are made by reacting a C₅ -C₉ lactone with an aminoalkyl derivative, e.g., N-(3-aminopropyl) morpholine, to form an adduct having a hydroxyl group on one end thereof and a tertiary amino nitrogen-containing heterocyclic ring group on the other end thereof, and then reacting the adduct with an ethylene-C₃ to C₂₈ alpha-olefin copolymer or terpolymer which has from about 0.2 to about 5 wt. % of ethylenically unsaturated carboxylic acid units grafted thereto, e.g., maleic anhydride ethylene-propylene copolymer. The resulting polymeric C₅ -C₉ lactone derivatives are usful per se as multifunctional oil soluble additives for fuel and lubricating oil compositions, including concentrates containing the additives.

Claims

1. A process for preparing polymeric dispersant additives for lubricating oils and hydrocarbon fuels, which comprises:

reacting a C_5-C9 lactone at a temperature of from about 50°

to about 200°

C. with an aminoalkyl derivative having from 2 to about 60 total carbon atoms and from 2 to about 12 nitrogen atoms, said aminoalkyl derivative being terminated on one end thereof by a primary or secondary amino group and being terminated on the other end thereof with a tertiary amino-containing hetero-cyclic ring, to effect ring opening polymerization of said lactone and to form an adduct which contains a heterocyclic ring on one end and a hydroxyl group on the other end; and

reacting said adduct at a temperature of from about 100°

to about 250°

C. for a period of from about 10 minutes to about 30 hours with a copolymer of ethylene and at least one C₃ to C₂₈ alpha-olefin, which copolymer has been grafted with an ethylenically unsaturated carboxylic acid material prior to being reacted with said adduct, to form an ester- and amide-containing polymeric dispersant reaction product having a degree of polymerization of said lactone of from about 0.2 to about 100 said ethylenically unsaturated dicarboxylic acid material being selected from the group consisting of organic compounds which contain at least two carboxylic acid groups or anhydride groups or a polar group which is convertible into said carboxylic acid groups by oxidation or hydrolysis.

2. The process of claim 1, wherein said ethylene copolymer has a number average molecular weight of from about 700 to about 500,000;

and wherein there is from about 5 wt. % to about 0.2 wt. % of ethylenically unsaturated carboxylic acid derived units in the grafted ethylene-alpha olefin copolymer.

3. The process of claim 2, wherein said C₅ -C₉ lactone is E-caprolactone.

4. The process of claim 2, wherein said C₃ to C₂ alpha-olefin comprises propylene.

5. The process of claim 2, wherein said ethylenically unsaturated carboxylic acid material is selected from group of materials having the formula:

##STR10## where R₁ and R₂ are hydrogen or a halogen, and X is oxygen, NH, or NR₃ wherein R₃ is a hydrocarbyl amine or a C₁ -C₄₀ alkyl group.

6. The process of claim 2, wherein said ethylenically unsaturated carboxylic acid material is selected from the group consisting of chloromaleic anhydride, itaconic anhydride, N-hexyl maleimide, maleic anhydride, and the corresponding dicarboxylic acids thereof.

7. The process of claim 6, wherein said ethylenically unsaturated carboxylic acid material is maleic anhydride.

8. The process of claim 5, wherein said C₅ -C₉ lactone is E-caprolactone, and wherein said ethylene copolymer is selected from ethylene-propylene copolymers containing from about 2 to about 98 wt. % ethylene moieties and from about 2 to about 98 wt. % propylene moieties and ethylene-alpha-olefin-non-conjugated diolefin terpolymers containing from about 2 to about 98 wt. % ethylene, from about 2 to about 98 wt. % of at least one C₃ -C₂₈ alpha-olefin, and up to about 20 mole % of said non-conjugated diolefin, based on the total weight of ethylene and alpha-olefin moieties present.

9. The process of claim 1, wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula:

##STR11## wherein G is hydrogen or an omega-aminoalkylene radical of from 1 to 3 carbon atoms, and p is a number of from 1 to 4.

10. The process of claim 5, wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula:

##STR12## wherein G is hydrogen or an omega-aminoalkylene radical of from 1 to 3 carbon atoms, and P is a number of from 1 to 4.

11. The process of claim 10, wherein said C₅ -C₉ is E-caprolactone, and wherein said ethylene copolymer is selected from ethylene-propylene copolymers containing from about 2 to about 98 wt. % ethylene moieties and from about 2 to about 98 wt. % propylene moieties and ethylene-alpha-olefin-non-conjugated diolefin terpolymers containing from about 2 to about 98 wt. % ethylene, from about 2 to about 98 wt. % of at least one C₃ -C₂₈ alpha-olefin, and up to about 20 mole % of said non-conjugated diolefin, based on the total weight of ethylene and alpha-olefin moieties present.

12. The process of claim 5, wherein a molar excess of said C₅ -C₉ lactone is reacted with said aminoalkyl derivative to form an adduct which contains an ester sequence between the terminal hydroxyl group and the terminal heterocyclic ring.

13. The process of claim 9, wherein a molar excess of said C₅ -C₉ lactone is reacted with said aminoalkyl derivative to form an adduct which contains an ester sequence between the terminal hydroxyl group and the terminal heterocyclic ring.

14. The process of claim 8, wherein a molar excess of said C₅ -C₉ lactone is reacted with said aminoalkyl derivative to form an adduct which contains an ester sequence between the terminal hydroxyl group and the terminal heterocyclic ring.

15. The process of claim 13, wherein said C₅ -C₉ lactone is E-caprolactone, wherein said aminoalkyl derivative is an N-aminoalkyl morpholine having from 1 to about 10 carbon atoms in the alkyl group.

16. The process of claim 13, wherein said C₅ -C₉ is E-caprolactone, wherein said aminoalkyl derivative is an N-aminoalkyl morpholine having from 1 to about 10 carbon atoms in the alkyl group.

17. The process of forming a polymeric dispersant additive for lubricating oils and hydrocarbon fuels, which comprises the steps of:

(a) forming a copolymer of ethylene and at least one C₃ -C₂₈ alpha-olefin and, optionally, a non-conjugated diolefin, wherein said copolymer comprises from 2 to about 98 wt. % of ethylene moieties, from 2 to about 98 wt. % alpha-olefin moieties, and up to about 20 mole % of non-conjugated diolefin moieties;

(b) grafting onto the copolymer formed in step (a) from about 0.2 wt. % to about 5 wt. % of an ethylenically unsaturated carboxylic acid material, said acid material being selected from the group consisting of organic compounds which contain at least two carboxylic acid groups or anhydride groups or a polar group which is convertible into said carboxylic acid groups by oxidation or hydrolysis;

(c) reacting a C₅ -C₉ lactone with an aminoalkyl derivative having from 2 to about 60 total carbon atoms and from 2 to about 12 nitrogen atoms at a temperature of from about 50 to about 200°

C. to effect ring opening polymerization of said lactone and to form an adduct which is terminated at one end thereof with a hydroxyl group and at the other end with a nitrogen-containing heterocyclic ring, said aminoalkyl derivative being terminated at one end thereof with a primary or secondary amino group and at the other end thereof with a nitrogen-containing heterocyclic ring, and said adduct having a degree of polymerization of said lactone of from about 0.2 to about 100; and

(d) reacting the adduct formed in step (c) with the grafted ethylene-alpha-olefin copolymer formed in step (b) at a temperature of from about 100°

to about 250°

C. to form a polymeric dispersant additive exhibiting improved varnish performance, the amount of said adduct being reacted in step (d) being from about 0.01 to about 10 moles of adduct per mole of grafted ethylene-alpha-olefin copolymer.

18. The process of claim 17, wherein said C₃ -C₂₈ alpha-olefin comprises propylene;

wherein said ethylenically unsaturated dicarboxylic acid material is a material selected from the group consisting of materials having the formula;

##STR13## wherein R₁ and R₂ are hydrogen or a halogen, and X is oxygen, NH or NR₃ wherein R₃ is a hydrocarbyl amine or a C₁ -C₄₀ alkyl group;

wherein said C₅ -C₉ lactone is E-caprolactone; and

wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula;

##STR14## wherein G is hydrogen or an omega-aminoalkylene radical of 1 to 3 carbon atoms, and p is a number from 1 to 4.

19. The process of forming a polymeric dispersant additive for lubricating oils and hydrocarbon fuels, which comprises the steps of:

(a) reacting a C₅ -C₉ lactone with an aminoalkyl derivative having from 2 to about 60 total carbon atoms and from 2 to about 12 nitrogen atoms at a temperature of from about 50°

to about 200°

C. to effect ring opening polymerization of said lactone and to form an adduct which is terminated at one end thereof with a hydroxyl group and at the other end with a nitrogen-containing heterocyclic ring, said aminoalkyl derivative being terminated at one end thereof with a primary or secondary amino group and at the other end thereof with a nitrogen-containing heterocyclic ring;

(b) forming a copolymer of ethylene and at least one C₃ -C₂₈ alpha-olefin and, optionally, a non-conjugated diolefin, wherein said copolymer comprises from 2 to about 98 wt. % of ethylene moieties, from 2 to about 98 wt. % alpha-olefin moieties, and up to about 20 mole % of non-conjugated diolefin moieties;

(c) grafting onto the copolymer formed in step (b) from about 0.2 wt. % to about 5 wt. % of an ethylenically unsaturated carboxylic acid material, said material being selected from the group consisting of organic compounds which contain at least two carboxylic acid groups or anhydride groups or a polar group which is convertible into said carboxylic acid groups by oxidation or hydrolysis; and

(d) reacting the adduct formed in step (a) with the grafted ethylene-alpha-olefin copolymer formed in step (c) at a temperature of from about 100°

to about 250°

C. to form a polymeric dispersant additive exhibiting improved varnish performance, the amount of said adduct being reacted in step (d) being from about 0.01 to about 10 moles of adduct per mole of grafted ethylene-alpha-olefin copolymer, said polymeric dispersant additive having a degree of polymerization of said lactone of from about 0.2 to about 100.

20. The process of claim 19, wherein said C₃ -C₂₈ alpha-olefin comprises propylene;

wherein said ethylenically unsaturated dicarboxylic acid material is a material selected from the group consisting of materials having the formula;

##STR15## wherein R₁ and R₂ are hydrogen or a halogen, and X is oxygen, NH or NR₃ wherein R₃ is a hydrocarbyl amine or a C₁ -C₄₀ alkyl group;

wherein said C₉ -C₉ lactone is E-caprolactone; and

wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula;

##STR16## wherein G is hydrogen or an omega-aminoalkylene radical of 1 to 3 carbon atoms, and p is a number from 1 to 4.

21. A polymeric lactone derivative useful as an oil additive having improved dispersancy and formed by reacting together at a temperature of from about 100°

to about 250°

C.;

(a) an adduct of a C₅ -C₉ lactone and an aminoalkyl derivative, and

(b) a copolymer of ethylene, at least one C₃ -C₂₈ alpha-olefin, and, optionally, a non-conjugated diolefin,

said aminoalkyl derivative having from 2 to about 60 total carbon atoms and from 2 to about 12 nitrogen atoms and being terminated at one end thereof with a primary or secondary amino group and at the other end thereof with a tertiary amino-containing heterocyclic ring,

said copolymer of ethylene having moieties derived from an ethylenically unsaturated carboxylic acid material grafted thereto, said acid material being selected from the group consisting of organic compounds which contain at least two carboxylic acid groups or anhydride groups or a polar group which is convertible into said carboxylic acid groups by oxidation or hydrolysis, and

said adduct of said C₅ -C₉ lactone and said aminoalkyl derivative being formed by reacting together said C₅ -C₉ lactone with said aminoalkyl derivative at a temperature of from about 50°

to about 200°

C., said adduct being terminated at one end thereof with a hydroxyl group and at the other end with said tertiary amino-containing heterocyclic ring, and said polymeric lactone derivative having a degree of polymerization of said lactone of from about 0.2 to about 100.

22. The polymeric lactone derivative of claim 21, wherein said ethylene copolymer has a number average molecular weight of from about 700 to about 500,000;

wherein there is from about 0.2 wt. % to about 5 wt. % of ethylenically unsaturated carboxylic acid derived units in the grafted ethylene-alpha olefin copolymer, wherein said non-conjugated diolefin, if present in the copolymer, is present in an amount up to about 20 mole %.

23. The polymeric lactone derivative of claim 22, wherein said C₅ -C₉ lactone is E-caprolactone.

24. The polymeric lactone derivative of claim 22, wherein said C₃ to C₂₈ alpha olefin comprises propylene.

25. The polymeric lactone derivative of claim 22, wherein said ethylenically unsaturated carboxylic acid material is selected from the group of materials having the formula:

##STR17## wherein R₁ and R₂ are hydrogen or a halogen, and X is oxygen, NH or NR₃ wherein R₃ is a hydrocarboxyl amine or a C₁ -C₄₀ alkyl group.

26. The polymer lactone derivative of claim 22, wherein said ethylenically unsaturated carboxylic acid material is selected from the group consisting of chloromaleic anhydride, itaconic anhydride, N-hexyl maleimide, maleic anhydride, and the corresponding dicarboxylic acids thereof.

27. The polymeric lactone derivative of claim 26, wherein said ethylenically unsaturated carboxylic acid material is maleic anhydride.

28. The polymeric lactone derivative of claim 25, wherein said C₅ -C₉ lactone is E-caprolactone, and wherein said ethylene copolymer is selected from the group consisting of ethylene-propylene copolymers containing from about 2 to about 98 wt. % ethylene moieties and from about 2 to about 98 wt. % propylene moieties, and ethylene-alpha-olefin-non-conjugated diolefin terpolymers containing from about 2 to about 98 wt. % ethylene, from about 2 to about 98 wt. % of at least one C₃ -C₂₈ alpha-olefin, and up to about 20 mole % of said non-conjugated diolefin, based on the total weight of ethylene and alpha-olefin moieties present.

29. The polymeric lactone derivative of claim 21, wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula:

##STR18## wherein G is hydrogen or an omega-aminoalkylene radical of from 1 to 3 carbon atoms, and p is a number of from 1 to 4.

30. The polymeric lactone derivative of claim 25, wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula:

##STR19## wherein G is hydrogen or an omega-aminoalkylene radical of from 1 to 3 carbon atoms, and p is a number of from 1 to 4.

31. The polymeric lactone derivative of claim 30, wherein said C₅ -C₉ lactone is E-caprolactone, and wherein said ethylene copolymer is selected from the group consisting of ethylene-propylene copolymers containing from about 2 to about 98 wt. % ethylene moieties and from about 2 to about 98 wt. % propylene moieties, and ethylene-alpha-olefin-non-conjugated diolefin terpolymers containing from about 2 to about 98 wt. % ethylene, from about 2 to about 98 % of at least one C₃ -C₂₈ alpha-olefin, and up to about 20 mole % of said non-conjugated diolefin, based on the total weight of ethylene and alpha-olefin moieties present.

32. The polymeric lactone derivative of claim 25, wherein said adduct of said C₅ -C₉ lactone and said aminoalkyl derivative contains an ester sequence between said terminal hydroxyl group and said terminal heterocyclic ring.

33. The polymeric lactone derivative of claim 29, wherein said adduct of said C₅ -C₉ lactone and said aminoalkyl derivative contains an ester sequence between said terminal hydroxyl group and said terminal heterocyclic ring.

34. The polymeric lactone derivative of claim 28, wherein said adduct of said C₅ -C₉ lactone and said aminoalkyl derivative contains an ester sequence between said terminal hydroxyl group and said terminal heterocyclic ring.

35. The polymeric lactone derivative of claim 33, wherein said C₅ -C₉ lactone is E-caprolactone wherein said aminoalkyl derivative is an N-aminoalkyl morpholine having from 1 to about 10 carbon atoms in the alkyl group.

36. An oil soluble dispersant useful as an oil additive, comprising the product of a reaction mixture comprising:

(I) an ethylene-C₃ to C₂₈ alpha-olefin copolymer or an ethylene-C₃ to C₂₈ alpha-olefin-non-conjugated diolefin terpolymer, wherein said copolymer or terpolymer contains from about 2.0 to about 5 wt. % of ethylenically unsaturated carboxylic acid material-derived units grafted thereto, said unsaturated carboxylic acid material being selected from the group consisting of organic compounds which contain at least two carboxylic acid groups or anhydride groups or a polar group which is convertible into said carboxylic acid groups by oxidation or hydrolysis, and

(II) a C₅ -C₉ lactone adduct having a hydroxyl group on one end thereof and an N-heterocyclic ring on the other end thereof, wherein said adduct was formed by reacting at a temperature of from about 50°

to about 200°

C. (a) a C₅ -C₉ lactone with (b) an aminoalkyl derivative having a terminal primary or secondary amino group on one end thereof and said N-heterocyclic ring of the other end thereof, said adduct having a degree of polymerization of said lactone of from about 0.2 to about 100, and said aminoalkyl derivative having from 2 to about 60 total carbon atoms and from 2 to about 12 nitrogen atoms,

wherein said product of said reaction mixture is prepared by reacting components (I) and (II) at a temperature of about 100°

to about 250°

C.

37. An oil soluble dispersant according to claim 36, wherein said C₅ -C₉ lactone is caprolactone and said dispersant contains the unit ##STR20## wherein m is from about 0.2 to about 50.

38. An oil soluble dispersant according to claim 37, wherein said aminoalkyl derivative is selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula:

##STR21## wherein G is hydrogen or an omega-aminoalkylene radical of from 1 to 3 carbon atoms, and p is a number of from 1 to 4.

39. An oil soluble dispersant according to claim 38, wherein said ethylenically unsaturated carboxylic acid material is selected from the group consisting of materials having the formula:

##STR22## wherein R₁ and R₂ are hydrogen or a halogen, and X is oxygen, NH or NR₃ wherein R₃ is a hydrocarboxyl amine or a C₁ -C₄₀ alkyl group.

40. An oil soluble reaction product useful as an oil additive having varnish performance of:

(a) polymer consisting essentially of an ethylene-C₃ to C₂₈ alpha-olefin backbone or an ethlyene-C₃ to C₈ alpha-olefin-non-conjugated diolefin backbone, said backbone having a number average molecular weight of about 700 to about 500,000 and having grafted thereto from about 0.2 to about 5 wt. % of ethylenically unsaturated carboxylic acid material units, based on the weight of the grafted polymer, said carboxylic acid material being selected from the group consisting of organic compounds which contain at least two carboxylic acid groups or anhydride groups or a polar group which is convertible into said carboxylic acid groups by oxidation or hydrolysis,

(b) an aminoalkyl derivative selected from the group consisting of aminoalkyl morpholines and heterocyclic nitrogen compounds of the general formula;

##STR23## wherein G is hydrogen or an omega-aminoalkylene radical of from 1 to 3 carbon atoms, and p is a number of from 1 to 4, and,

(c) a C₅ -C₉ lactone, wherein (b) is first reacted with (c) at a temperature of from about 50°

to about 200°

C. to form an adduct which is terminated on one end thereof with a hydroxyl group and on the other end thereof with a nitrogen-containing heterocyclic ring, wherein said adduct is then reacted with (a) at a temperature of from about 100°

to about 250°

C. to form said oil soluble reaction product, and wherein the degree of polymerization of said C₅ -C₉ lactone in said adduct is from about 0.2 to about 100.

41. An oil soluble reaction product according to claim 40, wherein said C₅ -C₉ lactone is caprolactone.

42. An oil soluble reaction product according to claim 41, wherein (a) is an ethylene-propylene copolymer which has been grafted with succinic anhydride moieties.

43. An oil soluble reaction product according to claim 40, wherein (c) is E-caprolactone and wherein the degree of polymerization of said E-caprolactone in said adduct is from about 0.5 to about 20.