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US 4,248,726 AGranted
High-viscosity refrigerator oil compositions
AssigneesNippon Oil Co., Ltd., Mitsubishi Jukogyo Kabushiki Kaisha, Sanyo Chemical Industries, Ltd.
InventorsKazuo Uchinuma, Umekichi Sasaki
Life of this patent
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Abstract
A high-viscosity refrigerator oil composition comprising (A) a polyglycol oil such as a polyoxypropylene glycol or an alkyl ether thereof and (B) 0.1-10% by weight, based on the total weight of (A) and (B), of a glycidyl ether type epoxy compound, an epoxidized fatty acid monoester and/or an epoxidized vegetable oil.
Claims7
A high-viscosity refrigerator oil composition consisting essentially of:
- (A) 90-99.9% by weight of a polyglycol oil having a kinematic viscosity of 50-200 cSt at 98.9.degree. C. and a viscosity index of at least 150, represented by the following formula
- R.sub.1 --O--(R.sub.2 O).sub.m --R.sub.3 ].sub.n
- wherein R.sub.1 and R.sub.3 are each a hydrogen atom, hydrocarbon radical or fatty acyl group and they may be identical with, or different from, each other, R.sub.2 is an alkylene group, n is an integer of 1-6 and mxn equals at least 30, and
- (B) 0.1-10% by weight of at least one member selected from the group consisting of (1) glycidyl ether epoxy compounds, (2) epoxidized fatty acid monoesters and (3) epoxidized vegetable oils.
1 more element
Dependencies are inferred from the claim text.