Lubricating oil composition for air compressors

Patent metadata

Field	Value
Publication number	US-9453179-B2
Application number	US-201314388563-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Mar 29, 2012
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A lubricating oil composition for an air compressor according to the present invention contains a synthetic base oil, and one or more amine-based antioxidants selected from the group consisting of asymmetric diphenylamine-based compounds, phenylnaphthylamine-based compounds, asymmetric dinaphthylamine-based compounds, dialkyl monophenylamine-based compounds and dialkyl mononaphthylamine-based compounds.

First claim

The invention claimed is:

1. A lubricating oil composition, comprising a synthetic base oil and 2.40%-10% by mass of monobutylphenyl-monooctylphenyl-amine, wherein:
the synthetic base oil is one or more selected from the group consisting of a polyglycol-based synthetic oil, an ester of pentaerythritol with a saturated fatty acid, and a poly-α-olefin-based synthetic oil.

2. The lubricating oil composition according to claim 1 , wherein the synthetic base oil is a mixed oil comprising said polyglycol-based synthetic oil and said ester of pentaerythritol with a saturated fatty acid.

3. The lubricating oil composition according to claim 1 , wherein the synthetic base oil comprises the polyglycol-based synthetic oil, and 70 mol % or more of a main chain moiety of the polyglycol-based synthetic oil is C3 to C4 oxyalkylene units.

4. The lubricating oil composition according to claim 1 , comprising 5% to 9% by mass of the monobutylphenyl-monooctylphenyl-amine.

5. The lubricating oil composition according to claim 1 , wherein the composition has a kinematic viscosity at 100° C. of 6.5 to 10 mm 2 /s.

6. An air compressor comprising the lubricating oil composition according to claim 1 .

7. The lubricating oil composition according to claim 1 , wherein the synthetic base oil comprises the polyglycol-based synthetic oil.

8. The lubricating oil composition according to claim 1 , wherein the synthetic base oil comprises the ester of pentaerythritol with a saturated fatty acid.

9. The lubricating oil composition according to claim 1 , wherein the synthetic base oil comprises the poly-α-olefin-based synthetic oil.

10. The lubricating oil composition according to claim 1 , wherein:
said composition has a kinematic viscosity at 100° C. of 6 to 12 mm 2 /s:
50 mol % or more of a main chain moiety of the polyglycol-based synthetic oil is C3 to C4 oxyalkylene units, and the polyglycol-based synthetic oil comprises a C1 to C4 alkyl group at a terminal end thereof; and
the poly-α-olefin-based synthetic oil is a polymer of a C8 to C18 α-olefin.

Assignees

• Idemitsu Kosan Co

Inventors

• Sato Tokue

Classifications

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10N2030/10

  Inhibition of oxidation, e.g. anti-oxidants · CPC title

• C10M2209/1033

  used as base material · CPC title

• C10M2209/1075

  used as base material · CPC title