Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Heterocyclic ring compound; a heterocyclic ring is one...
Patent
1996-01-19
1998-03-17
Diamond, Alan
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Heterocyclic ring compound; a heterocyclic ring is one...
508433, 508438, 252 68, C10M10538, C10M12918
Patent
active
057286558
ABSTRACT:
A refrigerating machine oil composition for vapor compression type refrigerating machines is disclosed which can be used with either of HCFC refrigerants and HFC refrigerants. The inventive machine oil composition comprises a polyol ester (ester compound) as a base oil. Furthermore, the base oil contains from 1.0 to less than 5.0% by weight of a phosphate, from 0.1 to 2.0% by weight of an alkyl phosphorothionate and/or an aryl phosphorothionate, and from 0.05 to 2.0% by weight of an epoxy compound. The composition is free from sludge formation and insufficient lubricity, which are drawbacks of the polyol ester, due to the synergistic effect of these additives. On the other hand, the inventive composition provides the desirable properties of a polyol ester base oil, namely, good compatibility with refrigerants, high electrical insulating properties, and low hygroscopicity.
REFERENCES:
patent: 5021179 (1991-06-01), Zehler et al.
patent: 5185092 (1993-02-01), Fukuda et al.
patent: 5447647 (1995-09-01), Ishida et al.
patent: 5620950 (1997-04-01), Kamakura et al.
Beppu Yukiharu
Hamada Takayoshi
Konishi Shozaburo
Muraki Masayoshi
Murata Nobuo
Diamond Alan
Mitsubishi Jukogyo Kabushiki Kaisha
Mitsubishi Oil Company, Limited
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