DICARBOXYLIC DIESTER, PROCESS FOR PRODUCING THE SAME, AND REFRIGERATING MACHINE LUBRICATING OIL COMPRISING THE ESTER

摘要

A dicarboxylic diester in which the two carbonyl groups are bonded to adjacent carbon atoms of the ring and which has the following properties (1) to (9). (1) total acid value: 0.05 mg KOH/g or lower. (2) sulfated ash content: 10 ppm or lower. (3) sulfur content: 20 ppm or lower. (4) phosphorus content: 20 ppm or lower. (5) peroxide number: 1.0 meq/kg or lower. (6) carbonyl value: 10 or lower. (7) volume resistivity: 1x10<11> OMEGA .cm or higher. (8) hydroxyl value: 3 mg KOH/g or lower. (9) water content: 100 ppm or lower.