Pinic Acid Diesters: Their Preparation, Properties, and Lubricant Applications

The preparation and properties are reported for a new class of diesters prepared from pinic acid and normal alcohols containing from 4 to 10 carbon atoms. These compounds compare favorably with the diesters of aliphatic dibasic acids and 2-ethylhexanol as regards V.I., pour point (or freezing point), volatility, and lubricity. Lubricating oil compositions have been developed which establish the suitability of the dialkyl pinates for a wide variety of applications. Excellent pinate-base greases have also been prepared with soap and other gelling agents. Mixtures of pinates with other types of esters, petroleum oils, polyethers, compatible silicones, and other synthetics oils can be used to formulate improved lubricant compositions.