Capacitor oil having excellent properties in wide temperature range
AssigneeJx Nippon Oil & Energy Corporation
InventorsNobuhiro Kimura, Hiroyuki Hoshino, Takahiro Kawaguchi
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Abstract
The present invention provides a capacitor oil that can maintain breakdown voltage at a high level in a wide temperature range of −50° C. to 30° C., extremely unlikely precipitates as crystals in particular at −50° C. and thus has excellent properties both at normal temperature and a lower temperature. The capacitor oil of the present invention comprises 1,1-diphenylethane and benzyltoluene, wherein the mass ratio of 1,1-diphenylethane to benzyltoluene is 0.8 to 2.0, the total amount of the ortho-isomer and para-isomer in the benzyltoluene is 90 percent by mass or less, and the composition has a 40° C. kinematic viscosity of 3.00 mm2/s or lower.
Claims19
A capacitor oil comprising 1,1-diphenylethane and benzyltoluene, wherein the mass ratio of 1,1-diphenylethane to benzyltoluene is 0.8 to 2.0, the total amount of the ortho-isomer and para-isomer in the benzyltoluene is 90 percent by mass or less and more than 72 percent by mass, and the oil has a 40° C. kinematic viscosity of 3.00 mm2/s or lower.
A capacitor oil comprising 1,1-diphenylethane and benzyltoluene, wherein the mass ratio of 1,1-diphenylethane to benzyltoluene is 0.8 to 2.0, the total amount of the ortho-isomer and para-isomer in the benzyltoluene is 90 percent by mass or less and the oil has a 40° C. kinematic viscosity of 2.66 to 3.00 mm2/s and a crystal precipitation temperature of −50° C. or lower.
Dependencies are inferred from the claim text.