Refrigerating Machine Oil

• US 20070275865A1
• Filed: 03/02/2005
• Published: 11/29/2007
• Est. Priority Date: 03/04/2004
• Status: Active Grant

• Current Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: Takigawa, Katsuya, Tagawa, Kazuo
• Granted Patent: US 8,083,965 B2
• Time in Patent Office: Days
• US Class Current: 508/438
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2207/021 having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2207/04 Ethers; Acetals; Ortho-esters; Ortho-carbonates
• CPC Class Codes: C10M 2207/042 Epoxides
• CPC Class Codes: C10M 2207/126 monocarboxylic
• CPC Class Codes: C10M 2207/281 of (cyclo)aliphatic monocarboxylic acids
• CPC Class Codes: C10M 2207/282 of (cyclo)aliphatic oolycarboxylic acids
• CPC Class Codes: C10M 2223/041 Triaryl phosphates
• CPC Class Codes: C10M 2223/047 Thioderivatives not containing metallic elements
• CPC Class Codes: C10N 2020/067 Unsaturated Compounds
• CPC Class Codes: C10N 2020/099 Containing Chlorofluorocarbons
• CPC Class Codes: C10N 2020/101 Containing Hydrofluorocarbons
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/40 Low content or no content compositions
• CPC Class Codes: C10N 2030/43 Sulfur free or low sulfur content compositions
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants

Abstract

The refrigerating machine oil of the present invention contains a mineral oil whose nitrogen content is not more than 50 ppm by mass and whose percent in aromatic ring structures (% C_A) is from 5 to 25. With the refrigerating machine oil of the present invention, high levels of lubricity, stability, and miscibility with refrigerants are attained, with a good balance between these, so refrigerating and air conditioning machines can be operated stably over a longer period.

Claims

1. A refrigerating machine oil, containing a mineral oil whose nitrogen content is nor more than 50 ppm by mass and whose percent in aromatic ring structure (% C_A) is from 5 to 25.

2. The refrigerating machine oil according to claim 1, wherein the sulfur content of the mineral oil is not more than 150 ppm by mass.

3. The refrigerating machine oil according to claim 1, further containing a phosphorothionate and a phosphorus-based additive other than said phosphorothionate.