Chemistry of hydrocarbon compounds – Product blend – e.g. – composition – etc. – or blending process... – Fluent dielectric
Patent
1987-09-04
1991-05-21
Pal, Asok
Chemistry of hydrocarbon compounds
Product blend, e.g., composition, etc., or blending process...
Fluent dielectric
174 25C, 174176F, 174 23C, 252570, 336 94, 361317, 361327, 585 11, 585 25, 585 66, H01B 324, H01G 422
Patent
active
050177338
ABSTRACT:
An electrical insulating oil composition which comprises 45% by weight or more of at least 2 members selected from the group consisting of (a) m-ethylbiphenyl, (b) p-ethylbiphenyl, (c) o-benzyltoluene, (d) m-benzyltoluene, (e) p-benzyltoluene, and (f) 1,1-diphenylethane; and the remainder of non-condensed bicyclic aromatic hydrocarbons having not more than 17 carbon atoms besides the above 6 components; and is characterized in that, when the temperature of the composition is -40.degree. C., (I) the total quantity of solid phase obtained by calculating according to the following solid-liquid equilibrium equation is 45% by weight or less relative to the total quantity of the composition, and (II) in the liquid phase composition calculated by the following solid-liquid equilibrium equation, the total quantity of the compounds (a) to (f) is 40% by weight or more and the viscosity of this liquid phase is 500 cSt or lower, ##EQU1## wherein X.sub.i is the equilibrium mole fraction of a component i in the liquid phase; .DELTA.H.sub.i.sup.f is a heat of fusion (cal.mol.sup.-1); T.sub.i.sup.f is a meltinig point (K); T is the temperature (K); and R is the gas constant (cal.mol.sup.-1.K.sup.-1).
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Dohi Hideyuki
Endo Keiji
Kawakami Shigenobu
Sato Atsushi
Nippon Petrochemicals Company Limited
Pal Asok
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