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US 5,492,642 AGranted
Top of rail lubricating method and composition
AssigneeTexaco Inc.
InventorsMark A. Mulvihill, Arnold C. Witte, Jr.
Life of this patent
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Abstract
An aqueous top of rail lubricant comprises a synthetic lubricant, a synthetic thickener, propylene glycol and ethanol. The lubricating composition is consumed in 5 to 15 minutes in the heat generated by a passing train. The lubricant is environmentally innocuous.
Claims4
A method of lubricating the top of a rail comprising:
- applying a lubricating composition in an amount sufficient to wet the rail in the heat generated by the passing of a train, the lubricating composition comprising:
- 15 to 30 wt% propylene glycol;
- 10 to 30 wt% of a first polyoxyalkylene glycol consisting of a linear ethylene oxide-propylene oxide copolymer having a molecular weight of about 3900 to 4600;
- 0.1 to 3 wt% of a second polyoxyalkylene glycol consisting of a linear ethylene oxide-propylene oxide copolymer having a molecular weight of 8000 to 12,000;
- and
- 2 to 18 wt% of an alcohol selected from the group consisting of ethanol, methanol and mixtures thereof.
3 more elements
Dependencies are inferred from the claim text.