Claims
- 1. A lubricant composition for a compression-type refrigerating machine, said composition comprising a refrigerant selected from the group consisting of 1,1,1,2-tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134), pentafluoroethane (R-125), difluoromethane (R-32), and 1,1,1-trifluoroethane (R-143a) and a lubricant comprising (A) 60 to 90% by weight of a synthetic oil composed of (A-1) at least one member selected from the group consisting of a poly-.alpha.-olefin and ethylene/.alpha.-olefin copolymer or (A-2) a mixture of an alkylbenzene and at least one member selected from the group consisting of a poly-.alpha.-olefin and an ethylene/.alpha.-olefin copolymer, said poly-.alpha.-olefin being a polymer of an .alpha.-olefin having 8 to 14 carbon atoms and a kinematic viscosity of 10 to 350 cSt at 40.degree. C., and (B) 10 to 40% by weight of a fluidity improver composed of at least one member selected from the group consisting of an ester compound and a triglyceride; said ester compound being selected from the group consisting of:
- (I) a reaction product of a polybasic carboxylic acid or a derivative thereof, a polyhydric alcohol or a derivative thereof and a monobasic fatty acid or a derivative thereof,
- (II) a reaction product of a polybasic carboxylic acid or a derivative thereof, a polyhydric alcohol or a derivative thereof and a monohydric aliphatic alcohol or a derivative thereof,
- (III) a reaction product of a polyhydric alcohol or a derivative thereof and a monobasic fatty acid or a derivative thereof,
- (IV) a reaction product of a monohydric aliphatic alcohol or a derivative thereof and a polybasic carboxylic acid or a derivative thereof, or
- (v) a reaction product of a polybasic carboxylic acid or a derivative thereof and a polyhydric alcohol or a derivative thereof.
- 2. The lubricant composition according to claim 1, wherein said polymer of an .alpha.-olefin is a polymer of 1-dodecene, 1-decene or 1-octene, each having a kinematic viscosity of 10 to 350 cSt at 40.degree. C.
- 3. The lubricant composition according to claim 1, wherein said ethylene/.alpha.-olefin copolymer is a copolymer of ethylene and an .alpha.-olefin selected from the group consisting of propylene, 1-butene, 1-hexene, 1-octene, 1-decene and 1-dodecene.
- 4. The lubricant composition according to claim 1, wherein said alkylbenzene is selected from a soft alkylbenzene or a hard alkylbenzene, each having a kinematic viscosity of 10 to 350 cSt at 40.degree. C.
- 5. The lubricant composition according to claim 1, wherein said mixture of the alkylbenzene and at least one member selected from the group consisting of a poly-.alpha.-olefin and an ethylene/.alpha.-olefin copolymer has an olefinic polymer content of 5 to 90% by weight of the mixture.
- 6. The lubricant composition according to claim 1, wherein said fluidity improver (B) has a kinematic viscosity of 3 to 50 cSt at 40.degree. C.
- 7. The lubricant composition according to claim 1, wherein said ester compound has 2 or more ester bonds.
- 8. The lubricant composition according to claim 1, wherein said refrigerant is R-134a.
- 9. The lubricant composition according to claim 1, wherein said refrigerant is R-125.
- 10. The lubricant composition according to claim 1, wherein said refrigerant is R-143a.
- 11. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-134a and R-125.
- 12. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-134a and R-32.
- 13. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-134a, R- 125 and R-32.
- 14. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-143a and R-125.
- 15. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-143a, R-125 and R-134a.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-030529 |
Feb 1992 |
JPX |
|
5-027907 |
Feb 1993 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation application of Ser. No. 177,074, filed Jan. 3, 1994, now abandoned, which application is a continuation-in-part application of Ser. No. 018,157, filed Feb. 16, 1993 (now abandoned).
This is a continuation-in-part application of application Ser. No. 08/018,157, filed Feb. 16, 1993.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5295357 |
Kaneko |
Mar 1994 |
|
5431835 |
Katafuchi et al. |
Jul 1995 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
0415778 |
Mar 1991 |
EPX |
0440069 |
Aug 1991 |
EPX |
0470788 |
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EPX |
62-292895 |
Dec 1987 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
177074 |
Jan 1994 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
18157 |
Jan 1993 |
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