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US 5,192,457 AGranted
Lubricating oil for use under radioactive or energy irradiation conditions
AssigneeNok Kluber Co., Ltd.
InventorJun Nishimura
Life of this patent
Estimating the term…
Abstract
A finely pulverized alkaline earth metal oxide or an alkali metal oxide is added to perfluoropolyether oil represented by the general formula Rf[CF(CF.sub.3)CF.sub.2 O].sub.5.about.60 Rf, to absorb HF generated by decomposition of the perfluoropolyether at radioactive or energy irradiation of the perfluoropolyether oil, thereby effectively suppressing diffusion of HF into the oil or the gas phase.
Claims5
A lubricating oil that is useful under radioactive or energy irradiation conditions which comprises a perfluoropolyether oil and a finely pulverized magnesium oxide distributed in the perfluoropolyether oil.
Dependencies are inferred from the claim text.