Lubricating bases for multigrade oils

Claim 2

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a dimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O -- R 1 ) n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, and diols having the general formula HO -- R 1 ' -- OH, in which R 1 ' is a divalent hydrocarbon radical, and with at least one hydrocarbyl monohydroxyl compound selected from monohydric hydrocarbyl alcohols, monohydric phenols of the formula R 2 - OH, oxyalkylenated monohydric hydrocarbyl alcohols, and oxyalkylenated monohydric phenols of the formula R 2 --O(R 1 --O) n H, wherein R 2 is an aliphatic, alicyclic or aromatic monovalent hydrocarbyl radical, and n' is a number of from 1 to 50, the reagents being employed in proportions which substantially correspond to 2 moles of dimeric acid for 1 mole of dihydroxyl compound and 2 moles of monohydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 3

A composition according to claim 1, wherein the dihydroxyl compound consists essentially of at least one polypropylene glycol having 2-30 oxypropylene groups and the monohydroxyl compound comprises at least one oxypropylenated monohydric alcohol having 1-30 oxypropylene groups.

Claim 4

A composition according to claim 1, wherein the dimeric acid results from the dimerisation of at least one unsaturated fatty acid that contains 18 carbon atoms.

Claim 5

A composition according to claim 2, wherein the dimeric acid results from the dimerization of C 18 unsaturated fatty acids, the dihydroxyl compound is a polypropylene glycol having a molecular weight of approximately 130 to 1,800 and the monohydroxyl compound is selected from the group consisting of (a) a monohydroxyl polyether of condensation of 1,2-propylene oxide on an aliphatic monohydric alcohol having 13 to 15 carbon atoms, which contains about 20 1,2-propylene oxide units per molecule, and (b) an aliphatic monohydric alcohol of 9-11 carbon atoms.

Claim 6

A composition according to claim 4, wherein said monohydroxyl compound consists essentially of said monohydroxyl polyether.

Claim 7

A composition according to claim 1, wherein the hydrocarbon oil is selected from solvent-refined or acid-refined mineral oils and hydrorefined mineral oils which have a viscosity at 37.8° C. of about 100 to 600 SSU.

Claim 8

A composition according to claim 1, wherein the hydrocarbon oil is selected from olefin polymers and mono- or polyalkylated aromatic compounds, which may be at least partially hydrogenated.

Claim 9

A composition according to claim 1, wherein said homogenous mixture essentially contains from 80 to 95% by weight of hydrocarbon oil and from 5 to 20% by weight of complex ester composition.

Claim 10

A composition according to claim 1, wherein said homogeneous mixture contains from 10 to 40% by weight of light ester, from 50 to 80% by weight of hydrocarbon oil and from 1 to 40% by weight of complex ester composition.

Claim 11

The improved lubricating composition according to claim 1, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 20 W 40 rating.

Claim 12

The improved lubricating composition according to claim 1, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 10 W 30 rating.

Claim 13

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a dimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H-- O -- R 1 ) n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, and diols having the general formula HO -- R 1 ' -- OH, in which R 1 ' is a divalent hydrocarbon radical, and with at least one hydrocarbyl monohydroxyl compound selected from monohydric hydrocarbyl alcohols, monohydric phenols of the formula R 2 --OH, oxyalkylenated monohydric hydrocarbyl alcohols, and oxyalkylenated monohydric phenols of the formula R 2 --O(R 1 -O) n H, wherein R 2 is an aliphatic, alicyclic or aromatic monovalent hydrocarbyl radical, and n' is a number of from 1 to 50, the reagents being employed in proportions which substantially correspond to 3 moles of dimeric acid for 2 moles of dihydroxyl compound and 2 moles of monohydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 14

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a dimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H-- O -- R 1 ) n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, and diols having the general formula HO -- R 1 ' -- OH, in which R 1 ' is a divalent hydrocarbon radical, and with at least one hydrocarbyl monohydroxyl compound selected from monohydric hydrocarbyl alcohols, monohydric phenols of the formula R 2 --OH, oxyalkylenated monohydric hydrocarbyl alcohols, and oxyalkylenated monohydric phenols of the formula R 2 --O(R 1 -O) n H, wherein R 2 is an aliphatic, alicyclic or aromatic monovalent hydrocarbyl radical, and n' is a number of from 1 to 50, the reagents being employed in proportions which substantially correspond to 3 moles of dimeric acid for 2 moles of dihydroxyl compound and 2 moles of monohydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 15

A composition according to claim 12, wherein the dihydroxyl compound consists essentially of at least one diol of the general formula HO--R 1 '--OH and the monohydroxyl compound consists essentially of at least one oxypropylenated monohydric alcohol having 1-30 oxypropylene groups.

Claim 16

A composition according to claim 13, wherein the dimeric acid results from the dimerization of C 18 unsaturated fatty acids, the dihydroxyl compound is neopentyl glycol and the monohydroxyl compound is a monohydroxy polyether of condensation of 1,2-propylene oxide on an aliphatic monohydric alcohol having from 13 to 15 carbon atoms, which contains about 20 propylene oxide units per molecule.

Claim 17

A composition according to claim 12, wherein the dihydroxyl compound consists essentially of at least one polypropylene glycol having 2-30 oxypropylene groups and the monohydroxyl compound comprises at least one oxypropylenated monohydric alcohol having 1-30 oxypropylene groups.

Claim 18

A composition according to claim 12, wherein the dimeric acid results from the dimerization of at least one unsaturated fatty acid that contains 18 carbon atoms.

Claim 19

A composition according to claim 12, wherein the hydrocarbon oil is selected from solvent-refined or acid-refined mineral oils and hydrorefined mineral oils, which have a viscosity at 37.8° C. of about 100 to 600 SSU.

Claim 20

A composition according to claim 12, wherein the hydrocarbon oil is selected from olefin polymers and mono- or polyalkylated aromatic compounds, which may be at least partially hydrogenated.

Claim 21

A composition according to claim 12, wherein said homogeneous mixtures essentially contains from 80 to 95% by weight of hydrocarbon oil and from 5 to 20% by weight of complex ester composition.

Claim 22

A composition according to claim 12, wherein said homogenous mixture contains from 10 to 40% by weight of light ester, from 50 to 80% by weight of hydrocarbon oil and from 1 to 40% by weight of complex ester composition.

Claim 23

The improved lubricating composition according to claim 12, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 20 W 40 rating.

Claim 24

The improved lubricating composition according to claim 12, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 10 W 30 rating.

Claim 25

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a dimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, and at least one monocarboxylic acid having the general formula R' 2 COOH, in which R' 2 is a monovalent hydrocarbon radical with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O--R 1 ) n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, the reagents being employed in proportions which substantially correspond to 1 mole of dimeric acid and 2 moles of monocarboxylic acid for 2 moles of dihydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 26

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a dimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, and at least one monocarboxylic acid having the general formula R' 2 COOH, in which R' 2 is a monovalent hydrocarbon radical with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O--R 1 ) n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, the reagents being employed in proportions which substantially correspond to 1 mole of dimeric acid and 2 moles of monocarboxylic acid for 2 moles of dihydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylenated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 27

A composition according to claim 23, wherein the dihydroxyl compound consists essentially of at least one polypropylene glycol having 2-30 oxypropylene groups.

Claim 28

A composition according to claim 24, wherein the dimeric acid results from the dimerization of C 18 unsaturated fatty acids, the dihydroxyl compound is a polypropylene glycol having a molecular weight of from about 130 to 1,800, and the monocarboxylic acid is lauric acid.

Claim 29

A composition according to claim 23, wherein the dimeric acid results from the dimerization of at least one unsaturated fatty acid that contains 18 carbon atoms.

Claim 30

A composition according to claim 23, wherein the hydrocarbon oil is selected from solvent-refined or acid-refined mineral oils and hydrorefined mineral oils, which have a viscosity at 37.8° C. of about 100 to 600 SSU.

Claim 31

A composition according to claim 23, wherein the hydrocarbon oil is selected from olefin polymers and mono- or polyalkylated aromatic compounds, which may be at least partially hydrogenated.

Claim 32

A composition according to claim 23, wherein said homogenous mixtures essentially contains from 80 to 95% by weight of hydrocarbon oil and from 5 to 20% by weight of complex ester composition.

Claim 33

A composition according to claim 23, wherein said homogenous mixture contains from 10 to 40% by weight of light ester, from 50 to 80% by weight of hydrocarbon oil and from 1 to 40% by weight of complex ester composition.

Claim 34

The improved lubricating composition according to claim 23, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 20 W 40 rating.

Claim 35

The improved lubricating composition according to claim 23, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 10 W 30 rating.

Claim 36

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a trimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O -- R 1 ).sub. n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, and diols having the general formula HO -- R 1 ' -- OH, in which R 1 ' is a divalent hydrocarbon radical, and with at least one monohydroxyl compound selected from monohydric hydrocarbyl alcohols, monohydric phenols of the formula R 2 -- OH, in which R 2 is an aliphatic, alicyclic or aromatic hydrocarbyl monovalent radical, and oxyalkylenated hydrocarbyl monohydric alcohols or monohydric phenols having the general formula R 2 -- O -- R 1 -- O ).sub. n H, in which R.sub. 1 and R 2 are as defined above and n' is a number of from 1 to 50, the reagents being employed in proportions which substantially correspond to 2 moles of trimeric acid for 1 mole of dihydroxyl compound and 4 moles of monohydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 37

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a trimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O -- R 1 ).sub. n OH, in which R 1 is a 1,2-alkylene radical and n is a number of from 2 to 50, and diols having the general formula HO -- R 1 ' -- OH, in which R 1 ' is a divalent hydrocarbon radical, and with at least one monohydroxyl compound selected from monohydric hydrocarbyl alcohols, monohydric phenols of the formula R 2 -- OH, in which R 2 is an aliphatic, alicyclic or aromatic hydrocarbyl monovalent radical, and oxyalkylenated hydrocarbyl monohydric alcohols or monohydric phenols having the general formula R 2 -- O -- R 1 -- O ).sub. n H, in which R.sub. 1 and R 2 are as defined above and n' is a number of from 1 to 50, the reagents being employed in proportions which substantially correspond to 2 moles of trimeric acid for 1 mole of dihydroxyl compound and 4 moles of monohydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 38

A composition according to claim 33, wherein the dihydroxyl compound consists essentially of at least one polypropylene glycol having 2-30 oxypropylene groups and the monohydroxyl compound comprises at least one oxypropylenated monohydric alcohol having 1-30 oxypropylene groups.

Claim 39

A composition according to claim 33, wherein the trimeric acid results from the trimerization of at least one unsaturated fatty acid which contains 18 carbon atoms.

Claim 40

A composition according to claim 34, wherein the trimeric acid results from the trimerization of C 18 unsaturated fatty acids, the dihydroxyl compound is a polypropylene glycol having a molecular weight of from about 130 to 1,800, and the monohydroxyl compound is a monohydroxy polyether of condensation of 1,2-propylene oxide on an aliphatic monohydric alcohol having from 13 to 15 carbon atoms, which contains about 20 1,2-propylene oxide units per molecule.

Claim 41

A composition according to claim 33, wherein the hydrocarbon oil is selected from solvent-refined or acid-refined mineral oils and hydrorefined mineral oils, which have a viscosity at 37.8° C of about 100 to 600 SSU.

Claim 42

A composition according to claim 33, wherein the hydrocarbon oil is selected from olefin polymers and mono- or polyalkylated aromatic compounds, which may be at least partially hydrogenated.

Claim 43

A composition according to claim 33, wherein said homogenous mixtures essentially contains from 80 to 95% by weight of hydrocarbon oil and from 5 to 20% by weight of complex ester composition.

Claim 44

A composition according to claim 33, wherein said homogenous mixture contains from 10 to 40% by weight of light ester, from 50 to 80% by weight of hydrocarbon oil and from 1 to 40% by weight of complex ester composition.

Claim 45

The improved lubricating composition according to claim 33, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 20 W 40 rating.

Claim 46

The improved lubricating composition according to claim 33, wherein said viscosity index improver is added in an amount sufficient to yeild a final composition of SAE 10 W 30 rating.

Claim 47

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a trimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, and at least one monocarboxylic acid having the general formula R 2 ' COOH, in which R 2 ' is a monovalent hydrocarbon radical, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O -- R 1 ) OH, in which R 1 is a 1,2, alkylene radical and n is a number of from 2 to 50, the reagents being employed in proportions which substantially correspond to 1 mole of trimeric acid and 3 moles of monocarboxylic acid for 3 moles of dihydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 48

In a lubricating composition usable as multigrade oil for motor-car engines, and comprising a major proportion of base oil of lubricating viscosity and, in amounts sufficient to effect each additives' attendant function, an additive selected from the group consisting of viscosity index improvers, antioxidants, detergents and mixtures thereof, the improvement which comprises utilizing as the base oil a homogeneous mixture comprising: a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity, b. from 1 to 50% by weight of at least one complex ester composition produced by the esterification of a trimeric acid derived from at least one unsaturated fatty acid which contains from 14 to 22 carbon atoms, and at least one monocarboxylic acid having the general formula R 2 ' COOH, in which R 2 ' is a monovalent hydrocarbon radical, with at least one dihydroxyl compound selected from polyalkylene glycols having the general formula H -- O -- R 1 ) OH, in which R 1 is a 1,2, alkylene radical and n is a number of from 2 to 50, the reagents being employed in proportions which substantially correspond to 1 mole of trimeric acid and 3 moles of monocarboxylic acid for 3 moles of dihydroxyl compound, and c. from 0 to 40% by weight of at least one light ester selected from esters of monohydric hydrocarbyl alcohols and hydrocarbyl dicarboxylic acids, esters of polyols and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl monocarboxylic acids, esters of polyoxyalkylinated hydrocarbyl monohydric alcohols of a low degree of condensation and hydrocarbyl dicarboxylic acids, and esters of polyoxalkylene glycols of low molecular weight and hydrocarbyl monocarboxylic acids.

Claim 49

A composition according to claim 43, characterized in that the dihydroxyl compound consists essentially of at least one polypropylene glycol having 2-30 oxypropylene groups.

Claim 50

A composition to claim 44, wherein the trimeric acid results from the trimerization of C 18 unsaturated fatty acids, the dihydroxyl compound is a polypropylene glycol having a molecular weight of from about 130 to 1,800, and the monocarboxylic acid is lauric acid.

Claim 51

A composition according to claim 43 wherein the trimeric acid results from the trimerization of at least one unsaturated fatty acid which contains 18 carbon atoms.

Claim 52

A composition according to claim 43, wherein the hydrocarbon oil is selected from solvent-refined or acid-refined mineral oils and hydrorefined mineral oils, which have a viscosity at 37.8° C of about 100 to 600 SSU.

Claim 53

A composition according to claim 43, wherein the hydrocarbon oil is selected from olefin polymers and mono- or polyalkylated aromatic compounds, which may be at least partially hydrogenated.

Claim 54

A composition according to claim 43, wherein said homogenous mixtures essentially contains from 80 to 95% by weight of hydrocarbon oil and from 5 to 20% by weight of complex ester composition.

Claim 55

A composition according to claim 43, wherein said homogenous mixture contains from 10 to 40% by weight of light ester, from 50 to 80% by weight of hydrocarbon oil and from 1 to 40% by weight of complex ester composition.

Claim 56

The improved lubricating composition according to claim 43, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 20 W 40 rating.

Claim 57

The improved lubricating composition according to claim 43, wherein said viscosity index improver is added in an amount sufficient to yield a final composition of SAE 10 W 30 rating.