US3720612A — Synthetic ester lubricating oil compositions

Claim 1

Independent Claim 187 words

A lubricating oil composition comprising a major portion, as a base oil, of a synthetic polyester lubricating oil formed by esterifying a hindered aliphatic polyol with a mono aliphatic carboxylic acid or by esterifying mixtures of said polyols with mixtures of said carboxylic acids and an amount, sufficient to improve load carrying properties, of (i) a neutral phosphate ester and (ii) an amine neutralized acid addition salt of a hydrocarbyl acid phosphate ester having at least one of the formulas or mixtures of the formulas: wherein R is a hydrocarbyl radical of between about one and about 18 carbon atoms, and R'', R'''' and R'''''' are each hydrogen or hydrocarbyl groups of from about one to about 24 carbon atoms, at least one of R'', R'''' and R'''''' being a hydrocarbyl group, the amine acid addition salt of the acid phosphate ester containing a total of between about 14 and about 60 carbon atoms per molecule, all phosphorus compounds present being neutral and having phosphorus in its highest valence state, said composition also containing an amount, sufficient to inhibit metal corrosion, of an aminobenzamide having the formula:

Claim 2

Dependent Claim 187 words

A lubricating oil composition comprising a major portion, as a base oil, of a synthetic polyester lubricating oil formed by esterifying a hindered aliphatic polyol with a mono aliphatic carboxylic acid or by esterifying mixtures of said polyols with mixtures of said carboxylic acids and an amount, sufficient to improve load carrying properties, of (i) a neutral phosphate ester and (ii) an amine neutralized acid addition salt of a hydrocarbyl acid phosphate ester having at least one of the formulas or mixtures of the formulas: wherein R is a hydrocarbyl radical of between about one and about 18 carbon atoms, and R'', R'''' and R'''''' are each hydrogen or hydrocarbyl groups of from about one to about 24 carbon atoms, at least one of R'', R'''' and R'''''' being a hydrocarbyl group, the amine acid addition salt of the acid phosphate ester containing a total of between about 14 and about 60 carbon atoms per molecule, all phosphorus compounds present being neutral and having phosphorus in its highest valence state, said composition also containing an amount, sufficient to inhibit metal corrosion, of an aminobenzamide having the formula:

Claim 3

Dependent Claim 59 words

A lubricating oil composition as in claim 1 wherein the amine neutralized acid addition salt of a hydrocarbyl acid phosphate ester is one in which the acid phosphate ester is a mixture of mono and dialkyl phosphates and the aliphatic polyol is selected from the group consisting of neopentylglycol, trimethylol propane, pentaerythritol, trimethylol ethane, dipentaerythritol, trimethylolbutane and mixtures thereof.

Claim 4

Dependent Claim 22 words

A lubricating oil composition as in claim 2 wherein the acid phosphate ester is a mixture of mono and dilauryl acid phosphate.

Claim 5

Dependent Claim 27 words

A lubricating oil composition as in claim 2 wherein the amine employed in forming the acid addition salt is a mixture of iso C12-C14 alkyl primary amines.

Claim 6

Dependent Claim 27 words

A lubricating oil composition as in claim 2 wherein the amine employed in forming the acid addition salt is a mixture of iso C18-C22 alkyl primary amines.

Claim 7

Dependent Claim 40 words

A lubricating oil composition as in claim 2 wherein the amine employed is a mixture of iso C18-C22 alkyl primary amine, the acid phosphate is a mixture of mono and di methyl phosphate and the neutral phosphate is tricresyl phosphate.

Claim 8

Dependent Claim 40 words

A lubricating oil composition as in claim 1 wherein the amount of amine acid addition salt and the amount of neutral phosphate ester are each between about 0.01 and about 10.0 parts per 100 parts of the ester base oil.

Claim 9

Dependent Claim 81 words

A lubricating oil composition as in claim 1 wherein the ester oil composition contains (i) between about 0.01 and about 5.0 parts of a C12-C22 alkyl primary amine addition salt of a mixed mono and dialkyl acid phosphate wherein the alkyl of the acid phosphate ranges between about C1 and about C18 and (ii) between about 0.01 and about 10.0 parts of a trialkaryl phosphate, the ester base oil also containing a small but effective amount of an aromatic amine antioxidant.

Claim 10

Dependent Claim 24 words

A lubricating oil composition as in claim 1 wherein the ester oil is a tetraester of pentaerythritol with a mixture of C4-C7 n-alkanoic acids.

Claim 11

Dependent Claim 28 words

A lubricating oil composition as in claim 1 wherein the ester oil is a tetraester of mixed mono and di pentaerythritol with a mixture of C5-C10 n-alkanoic acids.

Claim 12

Dependent Claim 66 words

A lubricating oil composition comprising a synthetic saturated mono carboxylic acid - hindered polyol ester lubricating oil and minor but effective amounts of an amine neutralized acid addition salt of a hydrocarbyl acid phosphate mixed mono and diester containing at least 22 carbon atoms per molecule, a trihydrocarbyl phosphate, a dialkaryl amine antioxidant, and an amount, sufficient to inhibit corrosion, of an aminobenzamide having the formula:

Claim 13

Dependent Claim 66 words

A lubricating oil composition comprising a synthetic saturated mono carboxylic acid - hindered polyol ester lubricating oil and minor but effective amounts of an amine neutralized acid addition salt of a hydrocarbyl acid phosphate mixed mono and diester containing at least 22 carbon atoms per molecule, a trihydrocarbyl phosphate, a dialkaryl amine antioxidant, and an amount, sufficient to inhibit corrosion, of an aminobenzamide having the formula:

Claim 14

Dependent Claim 31 words

A lubricating oil as in claim 11 wherein the trihydrocarbyl is tricresyl phosphate and the ester oil is a fully esterified mixture of mono and dipentaerythritol esterified with C5-C10 n-alkanoic acids.

Claim 15

Dependent Claim 99 words

A synthetic ester lubricating oil comprising per 100 parts by weight of the polyester of mixed mono and dipentaerythritol, in the weights of mono and dialcohols of between about 80 to 90 wt. percent of mono and about 10 to 20 wt. percent of di, esterified with mixed C5-C10 n-alkanoic acids, about 1.6 parts of p,p''diisooctyl diphenylamine, about 0.4 part of phenothiazine, about 0.1 part each of quinizarin, anthranilamide and the mixed iso C12-C14 primarily alkyl amine salt of mixed monomethyl and dimethyl acid phosphate esters, about 1.0 part of tricresyl phosphate and about 0.02 part of sebacic acid.

Claim 16

Dependent Claim 99 words

A synthetic ester lubricating oil comprising per 100 parts by weight of the polyester of mixed mono and dipentaerythritol, in the weights of mono and dialcohols of between about 80 to 90 wt. percent of mono and about 10 to 20 wt. percent of di, esterified with mixed C5-C10 n-alkanoic acids, about 1.6 parts of p,p''diisooctyl diphenylamine, about 0.4 part of phenothiazine, about 0.1 part each of quinizarin, anthranilamide and the mixed iso C12-C14 primarily alkyl amine salt of mixed monomethyl and dimethyl acid phosphate esters, about 1.0 part of tricresyl phosphate and about 0.02 part of sebacic acid.

Claim 17

Dependent Claim 13 words

The lubricating oil composition of claim 1 wherein R is a methyl group.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-03-12	1976-09-11	1977-03-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-03-12	1980-09-11	1981-03-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-03-12	1984-09-11	1985-03-13	$7700.00	Window Closed / Lapsed

Synthetic ester lubricating oil compositions

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