Diesters of polyethylene oxide as lubricant base oils
AssigneeVantage Santolubes Research LLC
InventorsThomas Reginald Forbus, Jr., Salvatore Michael Perna
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Abstract
A lubricant fluid comprising a base oil, which utilizes carboxylic esters of carboxyl di-end-capped-polyethylene glycols, or a mixture thereof, to have ultra-low viscosity, high flash point, high viscosity index (VI), excellent low temperature properties (viscosity and pour/freeze points), and low elastohydrodynamic (EHD) shear strength, and to enable the production of high efficiency fluids with enhanced temperature properties for machines or machine elements that operate in the elastohydrodynamic regime of lubrication.
Claims15
A lubricating fluid comprising:
- a carboxyl di-ester of polyethylene glycol having a formula
- wherein R1 and R2 each independently comprise branched alkyl groups, each alkyl group having 4 to 6 carbon atoms, and wherein m ranges from 2 to 12;
- and
- wherein the carboxyl di-ester of polyethylene glycol has an average molecular weight ranging from 240 g/mol to 500 g/mol.
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A machine comprising:
- two mechanical parts that interact with one another;
- and
- a lubricating fluid applied between the two parts, the lubricating fluid comprising:
- a carboxyl di-ester of polyethylene glycol having a formula
- wherein R1 and R2 each independently comprise alkyl groups, each alkyl group having 4 to 6 carbon atoms, and wherein m ranges from 2 to 12;
- wherein the carboxyl di-ester of polyethylene glycol has an average molecular weight ranging from 240 g/mol to 500 g/mol;
- and
- wherein the mechanical parts operate in an elastohydrodynamic regime of lubrication.
(canceled)
A process of lubricating an electric vehicle transmission, comprising:
- using a lubricating fluid which comprises:
- a carboxyl di-ester of polyethylene glycol having a formula
- wherein R1 and R2 each independently comprise alkyl groups, each alkyl group having 4 to 6 carbon atoms, and wherein m ranges from 2 to 12;
- wherein the carboxyl di-ester of polyethylene glycol has an average molecular weight ranging from 240 g/mol to 500 g/mol;
- and
- applying the lubricating fluid in an area between two mechanical parts of the transmission;
- wherein the mechanical parts operate in an elastohydrodynamic regime of lubrication.
Dependencies are inferred from the claim text.