Patent ID: 7282601

Claim:
An ester selected from the group consisting of alicyclic dicarboxylic acid diesters represented by the formula (E) wherein A represents a cyclohexane ring or a cyclohexene ring, X is a hydrogen atom or methyl, R X and R Y are the same or different and each is a branched-chain alkyl group having 3 to 18 carbon atoms, a straight-chain alkyl group having 1 to 18 carbon atoms, a straight-chain alkenyl group having 2 to 18 carbon atoms or a cycloalkyl group having 3 to 10 carbon atoms, the ester having the following properties: 1) a total acid number of 0.05 mgKOH/g or less, 2) a sulfated ash content of 10 ppm or less, 3) a sulfur content of 20 ppm or less, 4) a phosphorus content of 20 ppm or less, 5) a peroxide value of 1.0 meq/kg or less, 6) a carbonyl value of 10 or less, 7) a volume resistivity of 1×10 11 Ω·cm or more, 8) a hydroxyl value of 3 mgKOH/g or less, and 9) a water content of 100 ppm or less.