Synthetic ester lubricating oil composition containing particular t-butylphenyl substituted phosphates and stabilized hydrolytically with particular long chain alkyl amines
AssigneeExxon Research & Engineering Co.
InventorsStephen J. Metro, Dale D. Carr
Life of this patent
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Abstract
A synthetic ester lubricating oil composition having effective high temperature properties and hydrolytic stability comprising a selected synthetic ester base oil and the additive combination of a selected tertiary-butylphenyl substituted phosphate ester and a selected alkyl amine. Additionally, a method for providing hydrolytically stable turbine oils which comprises adding a combination of a selected tertiary-butylphenyl phosphate and a selected alkyl amine to a synthetic ester base oil.
Claims12
A synthetic ester lubricating oil composition comprising a major amount of synthetic ester base oil, from about 0.1 to about 5% by weight, based on the weight of lubricating oil composition of a phosphate ester having the formula:
- (RO).sub.3 PO
- with each R being phenyl or t-butylphenyl provided at least one R group is t-butylphenyl, and from about 0.001 to about 0.1% by weight, based on the weight of lubricating oil composition, of an alkyl amine having the formula:
- NR.sub.1 R.sub.2 R.sub.3
- where each of R.sub.1, R.sub.2 and R.sub.3 is a long chain alkyl group of about 16 to about 36 carbon atoms or hydrogen provided at least one of R.sub.1, R.sub.2 and R.sub.3 is said alkyl group and the total number of carbon atoms is about 24 to about 60, said synthetic ester base oil being selected from the group consisting of:
- (a) simple esters derived from monohydric aliphatic alcohols having from about 1 to about 18 carbon atoms and monobasic aliphatic acids having from about 2 to about 22 carbon atoms;
- (b) complex esters formed from the reaction of three or more of the following compounds:
- (i) monohydric aliphatic alcohols having about 1 to about 18 carbon atoms;
- (ii) monobasic aliphatic acids having about 2 to about 22 carbon atoms;
- (iii) aliphatic glycols or polyglycols having about 2 to about 70 carbon atoms;
- (iv) polyhydric aliphatic alcohols having about 4 to about 25 carbon atoms;
- (v) dibasic aliphatic acids having about 2 to about 25 carbon atoms;
- (vi) polybasic aliphatic acids having about 3 to about 30 carbon atoms, wherein at least one polyfunctional alcohol and at least one polyfunctional acid are employed;
- and
- (c) polyolesters derived from polyhydric aliphatic alcohols containing from about 2 to about 10 hydroxyl groups and about 4 to about 25 carbon atoms and monobasic aliphatic acids having from about 2 to about 22 carbon atoms.
The method of providing a hydrolytically stable synthetic ester lubricating oil composition comprising adding to a major amount of a synthetic ester base oil from about 0.1 to about 5% by weight, based on the weight of lubricating oil composition, of a phosphate ester having the formula:
- (RO).sub.3 PO
- with each R being phenyl or t-butylphenyl provided at least one R group is t-butylphenyl, and from about 0.001 to about 0.1% by weight, based on the weight of lubricating oil composition, of an alkyl amine having the formula:
- NR.sub.1 R.sub.2 R.sub.3
- each of R.sub.1, R.sub.2 and R.sub.3 is a long chain alkyl group of about 16 to about 36 carbon atoms or hydrogen, provided each of R.sub.1, R.sub.2 and R.sub.3 is said alkyl group and the total number of carbon atoms is about 24 to about 60.
Dependencies are inferred from the claim text.