Information
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Patent Application
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20070232505
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Publication Number
20070232505
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Date Filed
February 23, 200717 years ago
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Date Published
October 04, 200716 years ago
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CPC
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US Classifications
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International Classifications
Abstract
The deposit forming tendency of Group II, III and IV lubricating base oils is reduced by the use of synergistic mixtures of diphenylamines or phenyl-α-naphthylamines with triarylphosphites.
Claims
- 1. A method for reducing deposit formation in a lubricating base oil selected from the group consisting of Group II, III, IV oils and mixtures thereof comprising adding to the oil an effective amount of a mixture of triaryl phosphites represented by Formula I with diphenylamines or phenyl-α-naphthylamines represented by Formula II and III respectively,
- 2. The method of claim 1 wherein the weight ratio of diphenylamine or phenyl-α-naphthylamine to the triaryl phosphite in the mixture is in the range of from about 5:1 to about 1:5.
- 3. The method of claim 2 wherein the amount of the mixture added to the base oil is in the range of about 0.1 wt % to about 2 wt % based on the total weight of the composition.
- 4. The method of claim 3 wherein R1 is tert-butyl, R2 is H and R3 is octyl.
- 5. The method of claim 4 wherein the oil is a Group III oil.
- 6. The method of claim 5 wherein the Group III oil is a GTL oil.
- 7. A lubricating composition having reduced deposit forming tendency as evidenced by the Hot Tube Test, comprising:
a major amount of an oil of lubricating viscosity selected from the group consisting of Group II, III, IV oils and mixtures thereof; anda minor amount of a mixture of triaryl phosphites represented by Formula I with diphenylamines or phenyl-α-naphthylamines represented by Formula II and III respectively.
- 8. The composition of claim 7 wherein the weight ratio of diphenylamine or phenyl-α-naphthylamine to triaryl phosphite in the mixture is in the range of from about 5:1 to about 1:5.
- 9. The composition of claim 8 wherein the amount of the mixture is in the range of from about 0.1 wt % to about 2 wt %, based on the total weight of the composition.
- 10. The composition of claim 9 wherein R1 is tert-butyl, R2 is H and R3 is octyl.
- 11. The composition of claim 10 wherein the base oil is a Group III base oil.
- 12. The composition of claim 11 wherein the Group III base oil is a GTL oil.
- 13. A method for reducing deposit formation in a lubricating base oil selected from the group consisting of Group II, III, IV oils and mixtures thereof comprising adding to the oil an effective amount of a mixture of triaryl phosphites represented by Formula I with diphenylamines or phenyl-α-naphthylamines represented by Formula II and III respectively,
Provisional Applications (1)
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Number |
Date |
Country |
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60788235 |
Mar 2006 |
US |