Dispersed hydrated potassium borate compositions having improved properties in lubricating oil compositions
AssigneeChevron Oronite Company LLC
InventorsJames J. Harrison, Kenneth D. Nelson, Juan A. Buitrago
Life of this patent
Estimating the term…
Abstract
Disclosed are dispersed hydrated potassium borate compositions, as well as additive packages and finished oil compositions comprising the same. The dispersed hydrated potassium borate compositions of the invention exhibit low turbidity and the finished oil compositions exhibit improved wear performance under high temperature conditions.
Claims14
A dispersed hydrated potassium borate composition comprising a hydrated potassium borate, a dispersant, and an oil of lubrication viscosity wherein said hydrated potassium borate is characterized by a hydroxyl:boron ratio (OH:B) of from at least 1.2:1 to about 1.5:1, a potassium to boron ratio of from about 1:2.75 to 1:3.25 and a turbidity value of less than about 75 ntu.
A method for providing lower turbidity for oil compositions comprising a potassium metal borate and a dispersant which method comprises forming a dispersed hydrated potassium borate composition with an oil of lubricating viscosity, a dispersant and an anti-wear effective amount of a hydrated potassium borate wherein said dispersed hydrated potassium borate composition is selected to have a hydroxyl:boron ratio (OH:B) of from at least 1.2:1 to about 1.5:1, a potassium to boron ratio of from about 1:2.75 to 1:3.25 and a turbidity of less than about 75 ntu.
A method for inhibiting gear damage, as measured by reduced wear and metal fatigue associated with ridging and pitting, during operation of a gear set at a temperature of at least 163° C., which method comprises operating said gear set with a dispersed, hydrated, potassium borate composition comprising:
- (a) a hydrated potassium borate,
- (b) a dispersant, and
- (c) an oil of lubricating viscosity,
- wherein the dispersed, hydrated potassium borate composition is characterized by a hydroxyl:boron ratio (OH:B) of from at least 1.2:1 to about 1.5:1, a potassium to boron ratio of from about 1:2.75 to 1:3.25 and a turbidity value of less than about 75 ntu.
A method for the preparation of a dispersed hydrated potassium borate composition which comprises:
- (1) mixing, under agitation, a mixture comprising:
- (a) an aqueous solution of boric acid and potassium hydroxide wherein the stoichiometric ratio of reagants are selected to provide a potassium 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 potassium borate composition having a hydroxyl:
- boron ratio (OH:B) of from at least 1.2:1 to about 1.5:1 and a turbidity of less than about 75 ntu.
Dependencies are inferred from the claim text.