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US 4,267,064 AGranted
Refrigeration lubricating oil compositions
AssigneesNippon Oil Co., Ltd., Matsushita Electric Industrial Co., Ltd.
InventorsUmekichi Sasaki, Masaaki Tsunemi, Kaichi Yamada, Yoshiyuki Morikawa
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Abstract
Oil compositions are disclosed for effective use in the lubrication of rotary-type compressor for refrigeration equipment. The composition essentially comprises a polyglycol oil blended with specified amounts of at least one of additives or compounds of the group consisting of glycidyl ether type epoxy compounds, epoxidized fatty acid monoesters and epoxidized vegetable oils.
Claims5
A refrigeration lubricating oil composition which comprises:
- a starting polyglycol oil (A) having a kinetic viscosity in the range of 25-50 cSt at 98.9.degree. C. and a viscosity index of greater than 150, the polyglycol oil being represented by the formula ##STR2## wherein R.sub.1 and R.sub.3 each are a hydrogen atom, hydrocarbon radical or acyl group and may be identical with, or different from, each other;
- R.sub.2 is an alkylene group;
- n is an integer of 1-6;
- and m.times.n is 2 or greater;
- and
- an additive (B) selected from the group consisting of glycidyl ether type epoxy compounds (1), epoxidized fatty acid monoesters (2) and epoxidized vegetable oils (3), the additive (B) being in the range of 0.1-10 percent by weight of the total weight of components (A) and (B).
3 more elements
Dependencies are inferred from the claim text.