High temperature stability lubricant composition containing short chain acids and method for making the same

摘要

This invention generally relates to a high temperature stable polyol ester lubricant composition containing short chain carboxylic esters and a process for making the same. The polyol ester lubricant compositions are preferably formed from pentaerythritol and a mixture of C₂ to C₁₀ carboxylic acids in which (1) from 95 to 80 mole %, based on total acids, are C₅ to C₁₀ carboxylic acid, and (2) from 5 to 20 mole %, based on total acids, are at least one C₂ to C₄ carboxylic acid The polyol ester lubricant compositions of the present invention, specifically those using at least one C₂ to C₄ carboxylic acid, are useful as base stock for high temperature application such as Aviation Turbine Oils and exhibit enhanced anti-deposition and oxidation stability compared with the base polyol ester compositions while maintaining a good viscosity index.