Lubricant composition comprising alkali metal borate dispersed in a polyalkylene succinic anhydride and a metal salt of a polyisobutenyl sulfonate
AssigneeChevron Oronite Company LLC
InventorsJames J. Harrison, Kenneth D. Nelson
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Abstract
Disclosed are lubricant compositions comprising a dispersed hydrated alkali metal borate, a polyalkylene succinic dispersant selected from a polyalkylene succinic anhydride, a mixture of polyalkylene succinic anhydrides or derivatives thereof; and a metal salt of a polyisobutenyl sulfonate. Also disclosed are methods for improving the water tolerance of a lubricant composition and methods for preparing such lubricants comprising a dispersed hydrated alkali metal borate and a dispersant mixture.
Claims19
A lubricant composition which comprises:
- a base oil of lubricating viscosity;
- a dispersed hydrated alkali metal borate;
- and
- a dispersant mixture comprising:
- a) a polyalkylene succinic dispersant which is selected from the group consisting of a polyalkylene succinic anhydride, a non-nitrogen containing derivative of the polyalkylene succinic anhydride, mixtures of polyalkylene succinic anhydrides, mixtures of non-nitrogen containing derivatives of the polyalkylene succinic anhydride, and mixtures of one or more polyalkylene succinic anhydrides and one or more non-nitrogen containing derivatives of the polyalkylene succinic anhydride;
- and
- b) a metal salt of a polyisobutenyl sulfonate, wherein the polyisobutenyl moiety has a number average molecular weight from about 400 to 1200.
A method for enhancing the water tolerance of lubricant compositions comprising alkali metal borate which method comprises adding an anti-wear effective amount of an alkali metal borate to a base oil of lubricating viscosity in combination with a dispersant effective amount of a dispersant mixture comprising:
- a) a polyalkylene succinic dispersant which is selected from the group consisting of a polyalkylene succinic anhydride, a non-nitrogen containing derivative of the polyalkylene succinic anhydride, mixtures of polyalkylene succinic anhydrides, mixtures of non-nitrogen containing derivatives of the polyalkylene succinic anhydride, and mixtures of one or more polyalkylene succinic anhydrides and one or more non-nitrogen containing derivatives of the polyalkylene succinic anhydride;
- and
- b) a metal salt of a polyisobutenyl sulfonate, wherein the polyisobutenyl moiety has a number average molecular weight from about 400 to 1200.
A method for preparing a lubricant composition comprising a base oil of lubricating viscosity, a dispersed hydrated alkali metal borate, and a dispersant mixture comprising:
- a) a polyalkylene succinic dispersant which is selected from the group consisting of a polyalkylene succinic anhydride, a non-nitrogen containing derivative of the polyalkylene succinic anhydride, mixtures of polyalkylene succinic anhydrides, mixtures of non-nitrogen containing derivatives of the polyalkylene succinic anhydride and mixtures of one or more polyalkylene succinic anhydrides and one or more non-nitrogen containing derivatives of the polyalkylene succinic anhydride;
- and
- b) a metal salt of a polyisobutenyl sulfonate, wherein the polyisobutenyl moiety has a number average molecular weight from about 400 to 1200;
- which method comprises:
- mixing, under agitation, (1) an aqueous solution of boric acid and alkali metal hydroxide, and (2) a diluent oil containing the polyalkylene succinic dispersant and the polyisobutenyl sulfonate;
- and
- heating the mixture to remove the water.
Dependencies are inferred from the claim text.