Synthetic turbine oils
AssigneeTexaco Inc.
InventorsIsaac D. Rubin, John W. Nebzydoski
Life of this patent
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Abstract
Disclosed are synthetic lubricating oil compositions for turbine engines containing a major amount of aliphatic carboxylic acid esters having lubricating properties whose pour points are depressed by the incorporation of a synergistic mixture of minor amounts of at least one mineral oil with a methacrylic pour point depressant.
Claims9
A synthetic lubricating oil composition comprising a major amount of an aliphatic ester base oil having lubricating properties and formed by the reaction of a pentaerythritol or trimethylolpropane and an organic acid having from about 2 to about 12 carbon atoms per molecule together with a pour point depressant amount of a mixture of a mineral oil having lubricating properties and a pour point ranging from -40.degree. F to +35.degree. F with a copolymer of two or more esters of methacrylic acid characterized by the formula:
- ##STR2## wherein R is a radical ranging from butyl to stearyl and n is an integer giving a molecular weight to said polymer ranging from 5000 to 500,000.
Dependencies are inferred from the claim text.