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US 6,669,872 B2Granted
Electrical insulating oil with reduced gassing tendency
AssigneeExxonMobil Research and Engineering Company
InventorsChristopher Jeffrey Still Kent, Jacob B. Angelo
Life of this patent
Estimating the term…
Abstract
An electrical oil having reduced gassing tendency includes a major amount of a paraffinic or naphthenic basestock and a blend of certain hindered phenols, especially a blend of 2,6-di-t-butyl phenol and 2,6-di-t-butyl cresol. A further enhanced gassing tendency can be provided to the electrical oil by including a tolyltriazole derivative.
Claims8
An electrical oil composition comprising:
- a major amount of a paraffinic or naphthenic oil having a viscosity greater than about 5 cSt at 40° C. and the combination of at least one phenol represented by formula I
- and at least one phenol represented by formula II
- where R1 and R2 may be the same or different alkyl groups having 3 to about 9 carbon atoms, the combination being present in an amount greater than 0.5 wt % based on the weight of oil and the weight ratio of a phenol of formula I to II being in the range of 1:10 to 10:1.
Dependencies are inferred from the claim text.