Claims
- 1. A lubricating oil composition for a wet brake or wet clutch comprising 97 to 60% by weight of mineral oil and 3 to 40% by weight of polyester, said mineral oil having a kinematic viscosity at 100.degree. C. of 2 to 50 centistokes, a pour point of lower than -30.degree. C. and a viscosity index of at least 70, and wherein the polyester is a hindered ester or a dicarboxylic acid ester.
- 2. The composition as claimed in claim 1 wherein mineral oil has a kinematic viscosity at 100.degree. C. of 5 to 30 centistokes.
- 3. The composition as claimed in claim 1 wherein the mineral oil has a pour point of not more than -40.degree. C.
- 4. The composition as claimed in claim 1 wherein the mineral oil has a viscosity index of 75 to 105.
- 5. The composition as claimed in claim 1 wherein the mineral oil has a kinematic viscosity at 100.degree. C. of 5 to 30 centistokes, a pour point of not more than -40.degree. C. and a viscosity index of 75 to 105.
- 6. The composition as claimed in claim 1 wherein the polyester has a pour point of not more than -30.degree. C.
- 7. The composition as claimed in claim 1 wherein the polyester is a dicarboxylic acid ester of C.sub.3 -C.sub.18 alcohol and a C.sub.4 -C.sub.16 dibasic acid.
- 8. The composition as claimed in claim 7, wherein said C.sub.3 -C.sub.18 alcohol is isobutyl alcohol, isoamyl alcohol, isohexyl alcohol, isooctyl alcohol, isononyl alcohol, isodecyl alcohol or isotridecyl alcohol and said dibasic acid is adipic acid, azelaic acid, sebacic acid or dodecane dicarboxylic acid.
- 9. The composition of claim 7 wherein said alcohol is a C.sub.4 -C.sub.13 alcohol.
- 10. The composition as claimed in claim 5 wherein the polyester is a dicarboxylic acid ester of C.sub.3 -C.sub.18 alcohol and a C.sub.4 -C.sub.16 dibasic acid.
- 11. The composition as claimed in claim 10, wherein said C.sub.3 -C.sub.18 alcohol is isobutyl alcohol, isoamyl alcohol, isohexyl alcohol, isooctyl alcohol, isononyl alcohol, isodecyl alcohol or isotridecyl alcohol and said dibasic acid is adipic acid, azelaic acid, sebacic acid or dodecane dicarboxylic acid.
- 12. The composition of claim 10 wherein said alcohol is a C.sub.4 -C.sub.13 alcohol.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-209635 |
Sep 1986 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 183,744, filed Apr. 11, 1988, which is the designated U.S. application of PCT/JP87/00657 filed Sept. 4, 1987, published as WO88/02020 on Mar. 24, 1988 now abandoned.
US Referenced Citations (3)
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Continuations (1)
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Number |
Date |
Country |
Parent |
183744 |
Apr 1988 |
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