Lubricant composition, use thereof and aliphatic ether compound

Patent metadata

Field	Value
Publication number	US-9920274-B2
Application number	US-201515129757-A
Country	US
Kind code	B2
Filing date	Oct 21, 2015
Priority date	Feb 9, 2015
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The present invention provides a lubricant composition having high moisture resistance and having physical properties including low viscosity, low evaporability, low-temperature fluidity, and a high viscosity index. The lubricant composition contains (i) an aliphatic ether compound as a base oil and (ii) an antioxidant made from at least alkylated phenylnaphthylamine and phosphite ester, wherein a sum of individual amounts of the alkylated phenylnaphthylamine and the phosphite ester is a predetermined amount, and the alkylated phenylnaphthylamine and the phosphite ester are used in a predetermined ratio.

First claim

The invention claimed is:

1. A lubricant composition comprising:
an aliphatic ether compound that serves as a base oil; and
an antioxidant including at least alkylated phenylnaphthylamine and phosphite ester,
wherein a sum of individual amounts of the alkylated phenylnaphthylamine and the phosphite ester, which are contained in the lubricant composition, is 3% to 8% by weight relative to a total amount of the base oil, and
the alkylated phenylnaphthylamine and the phosphite ester are used in such a ratio that the alkylated phenylnaphthylamine and the phosphite ester account for 85% to 95% by weight and 5% to 15% by weight, respectively, of the sum of the individual amounts of the alkylated phenylnaphthylamine and the phosphite ester.

2. The lubricant composition according to claim 1 , wherein the aliphatic ether compound is an aliphatic ether compound having 8 to 300 carbon atoms in one molecule and having 1 to 150 oxygen atoms in one molecule.

3. The lubricant composition according to claim 1 , wherein the aliphatic ether compound is 2-(2-ethylhexyloxy)ethyl ether compound.

4. The lubricant composition according to claim 1 , wherein the aliphatic ether compound is at least one compound selected from the group consisting of compounds having respective structures represented by the following chemical formulae (1) to (10):

5. The lubricant composition according to claim 1 , wherein the alkylated phenylnaphthylamine is N-phenyl-dodecylnaphthalene-1-amine or N-phenyl-octylnaphthalene-1-amine.

6. The lubricant composition according to claim 1 , wherein the phosphite ester is 1,1,3-tris(2-methyl-4-ditridecylphosphite-5-t-butylphenyl)butane.

7. A bearing oil comprising a lubricant composition recited in claim 1 .

8. A bearing which is lubricated with use of a lubricant composition recited in claim 1 .

9. The bearing according to claim 8 , which is a fluid bearing or an impregnated bearing.

10. A motor comprising a bearing recited in claim 8 .

11. A method for lubricating a bearing, comprising:
lubricating a bearing with use of a lubricant composition recited in claim 1 .

12. A method for producing a grease, the method comprising adding a thickener to the lubricant composition of claim 1 .

13. A grease containing a lubricant composition recited in claim 1 .

14. A freezer oil containing a lubricant composition recited in claim 1 .

15. An aliphatic ether compound having a structure represented by any one of the following chemical formulae (1) to (9):

Assignees

• Moresco Corp

Inventors

• Maruyama Shingo

Classifications

• C10M2207/127

  polycarboxylic · CPC title

• C10M2215/223

  Five-membered rings containing nitrogen and carbon only · CPC title

• C10M2215/065

  Phenyl-Naphthyl amines · CPC title

• C10M2207/283

  of polyhydroxy compounds · CPC title

• C10M2207/2825

  used as base material · CPC title