TREA

Method for reducing deposit formation in lubricant compositions

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Information

  • Patent Application
  • 20070232505
  • Publication Number
    20070232505
  • Date Filed
    February 23, 2007
    17 years ago
  • Date Published
    October 04, 2007
    16 years ago
Information
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.
Description
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)
Number Date Country
60788235 Mar 2006 US