Claims
- 1. A biodegradable lubricant or functional fluid composition which comprises:
- (A) 50-60 wt. % of a synthetic ester base oil which is an ester of a polyhydric alcohol and a mixture of monocarboxylic acids comprising about 45-55 mole % of branched C.sub.8 acids and 55-45 mole % of a mixture of linear C.sub.8 and C.sub.10 acids the ester having a viscosity of 4.0-12.0 cSt at 100.degree. C.,
- (B) 6-8 wt. % of a second ester effective to enhance the lubricity and antiwear properties of the composition, said second ester being prepared from (i) a polyol selected from the group consisting of trimethylolpropane, pentaerythritol, dipentaerythritol and neopentyl glycol and (ii) an aliphatic monocarboxylic acid having 12 to 28 carbon atoms, and
- (C) the balance an additive package for lubricants or functional fluids, wherein the composition has a biodegradability of at least 55% as measured by the ASTM D 5864-95 modified Sturm test and exhibits environmentally acceptable aquatic toxicity properties.
- 2. The composition of claim 1 wherein the acid of component (B) is isostearic acid.
- 3. The composition of claim 2 wherein the polyol of component (B) is trimethylolpropane.
- 4. The composition of claim 1 which is a functional fluid.
- 5. The composition of claim 4 which is a hydraulic fluid.
- 6. The composition of claim 1 wherein the additive package comprises a polyisobutenyl succinimide dispersant.
- 7. The composition of claim 1 wherein the additive package comprises a diisooctyl adipate isoheptyl or isodecyl alcohol, or a mixture thereof as a viscosity diluent.
- 8. The composition of claim 1 wherein the base ester oil is an ester of technical grade pentaerythritol.
- 9. The composition of claim 6 which contains about 15-19 wt. % of the dispersant.
- 10. The composition of claim 6 which contains 7-8 wt. % of a detergent dispersant prepared by condensing isostearic acid, polyisobutenyl (Mn 950) succinic anhydride and tetraethylene pentamine, and 7-8 wt. % polyisobutenyl (Mn 950) succinimide detergent/dispersant.
- 11. The composition of claim 7 the lubricity additive is trimethylolpropane isostearate.
- 12. The composition of claim 1 wherein the lubricity additive is trimethylolpropane isostearate.
- 13. A fuel lubricant admixture suitable for use in a two-cycle engine comprising about 20-250 parts by wt. of fuel per 1 part by wt. of the lubricating oil composition of claim 1.
- 14. The composition of claims 2, 3, 4, 5, 6-12, 13 which is prepared by admixing the ingredients.
Parent Case Info
This is a continuation of application Ser. No. 08/934,965 filed Sep. 22, 1997, now U.S. Pat. No. 5,880,075.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO9405745 |
Mar 1994 |
WOX |
Continuations (1)
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Number |
Date |
Country |
Parent |
934965 |
Sep 1997 |
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