Dispersed hydrated sodium borate compositions having improved properties in lubricating oil compositions
AssigneeChevron Oronite Company LLC
InventorsJames J. Harrison, Kenneth D. Nelson
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Abstract
Disclosed are dispersed hydrated sodium borate compositions, as well as additive packages and finished oil compositions comprising the same. The dispersed hydrated sodium borate compositions of this invention exhibit decreased turbidity and the finished oil compositions improved water tolerance when the hydroxyl to boron ratio is carefully controlled.
Claims14
A dispersed hydrated sodium borate composition comprising a hydrated sodium borate, a dispersant, and an oil of lubricating viscosity wherein said hydrated sodium borate is characterized by a hydroxyl:boron ratio (OH:B) of from about 0.80:1 to 1.60:1 and by a sodium to boron ratio of from about 1:2.75 to 1:3.25.
A method for providing lower turbidity for oil compositions comprising a sodium metal borate and a dispersant which method comprises forming a dispersed hydrated sodium borate composition with an oil of lubricating viscosity, a dispersant and an anti-wear effective amount of a hydrated sodium borate wherein said dispersed hydrated sodium borate composition is selected to have a hydroxyl:boron ratio (OH:B) of from about 0.80:1 to 1.60:1 and a sodium to boron ratio of from about 1:2.75 to 1:3.25.
A method for the preparation of a dispersed hydrated sodium borate composition which comprises:
- (1) mixing, under agitation, a mixture comprising:
- (a) an aqueous solution of boric acid and sodium hydroxide wherein the stoichiometric ratio of reagents are selected to provide for a sodium to boron ratio in the product of from about 1:2.75 to 1:3.25,
- (b) an oil of lubricating viscosity;
- and
- (c) a dispersant;
- and then,
- (2) heating the mixture to remove sufficient water so as to produce a dispersed hydrated sodium borate having a hydroxyl:boron ratio (OH:B) of from about 0.80:1 to 1.60:1.
Dependencies are inferred from the claim text.