Additive package for high temperature synthetic lubricants
OwnerDale Carr, Thomas Schaefer +1inventors
InventorsDale Carr, Thomas Schaefer, Jeffrey Hutter
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Abstract
An improved additive package including at least a polymeric amine antioxidants and a borated extreme pressure/antiwear agent for a polyol ester lubricant suitable for use in high temperature applications is provided. The lubricant fluid includes a base stock that is the reaction product of a polyol and monocarboxylic acid mixture including a major proportion of 3,5,5-trimethylhexanoic acid (iso-C9 acid). The additive package may be added in up to about 20 percent by weight of the lubricant to provide a viscosity of the lubricant at 40° C. of at least about 140 cSt and at 100° C. of no less than about 15.0 cSt. Greases are formed by adding a thickener to a high viscosity lubricating fluid.
Claims26
An additive package for a polyol ester base stock suitable for high temperature use, comprising:
- at least one oligomeric aromatic amine antioxidant, and
- at least one borated extreme pressure/antiwear agent.
A synthetic ester based lubricant fluid, comprising
- (A) an ester base stock that is the reaction product of:
- (i) pentaerythritol, and
- (ii) a monocarboxylic acid mixture including at least 60 weight percent iso-C9 acid;
- and
- (B) an effective amount of an additive package including:
- at least one oligomeric aromatic amine antioxidant, and
- at least one borated extreme pressure/antiwear agent;
- the lubricant fluid having a viscosity at 40° C. of at least about 120 cSt.
A synthetic ester base lubricant fluid, comprising
- (A) an ester base stock that is the reaction product of:
- (i) dipentaerythritol, and
- (ii) a monocarboxylic acid mixture including at least about 60 weight percent iso-C9 acid and straight chain C7 and C8-10 acids;
- and
- (B) an effective amount of an additive package including:
- at least one oligomeric aromatic amine antioxidant and
- a borated extreme pressure/antiwear agent;
- to yield the lubricant fluid having a viscosity at 40° C. of at least about 120 cSt.
Dependencies are inferred from the claim text.