Chemistry of hydrocarbon compounds – Product blend – e.g. – composition – etc. – or blending process... – Fluent dielectric
Patent
1987-09-04
1992-05-12
Pal, Asok
Chemistry of hydrocarbon compounds
Product blend, e.g., composition, etc., or blending process...
Fluent dielectric
585 66, 585 24, 585 25, 361315, 361323, 361327, 252570, H01B 324
Patent
active
051130297
ABSTRACT:
A new electrical insulating oil composition having improved low temperature characteristics which composition comprises a mixture of 40% by weight or more of benzyltoluene and the remainder of alkyl substituted diphenylmethane having 15 to 17 carbon atoms which is represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.1 to C.sub.4 alkyl groups and the total number of carbon atoms in R.sub.1 and R.sub.2 is 1 to 4, with the proviso that R.sub.1 and R.sub.2 may not simultaneously be methyl groups and the proportion of the total quantity of solid phase calculated according to the following general solid-liquid equilibrium equation is 45% by weight or less relative to the total quantity of said composition at -40.degree. C.: ##EQU1## where X.sub.i is the equilibrium mole fraction of a component i, in the liquid phase, .DELTA.H.sub.i.sup.f is the heat of fusion (cal.mol.sup.-1), T.sub.i.sup.f is the melting point (K), T is the temperature (K) system, and R is the gas constant (cal.mol.sup.-1.K.sup.-1).
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Kashiwazaki et al, Toshiba Review, No. 108, Mar.-Apr. 1977 (pp. 9-12).
Dohi Hideyuki
Endo Keiji
Kawakami Shigenobu
Sato Atsushi
Nippon Petrochemicals Company Limited
Pal Asok
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