Claims
- 1. An ester base stock for a smokeless two cycle engine lubricant comprising: at least one linear oligoester having a molecular weight of 3000 Daltons or less containing residues of a non-hindered, unbranched diol containing from 4 to 6 carbon atoms, residues of a dicarboxylic acid containing from 6 to 36 carbon atoms and optionally residues of at least one member selected from the group consisting of monocarboxylic acids and monools each having from 7 to 10 carbon atoms wherein the base stock has a smoke index of at least 75.
- 2. The ester base stock of claim 1 wherein said base stock comprises an oligoester comprised of dipropylene glycol, azelaic acid and nonanonic acid residues wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 3. The ester base stock of claim 1 wherein said base stock comprises an oligoester comprised of dipropylene glycol, adipic acid and nonanoic acid residues wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 4. The ester base stock of claim 1 wherein said base stock comprises an oligoester comprised of diethylene glycol, azelaic acid and nonanoic acid residues and wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 5. The ester base stock of claim 1 wherein said oligoester comprises dimer acid residues and diethylene glycol residues.
- 6. The ester base stock of claim 1 further comp rising an additive selected from the group consisting of extreme pressure additives, anti-foaming agents, pour point depressants, rust or corrosion prevention agents, oxidation inhibitors, detergent, dispersants, smoke-suppression agents, hydrocarbon diluents.
- 7. A method for eliminating or reducing observable smoke in an exhaust emitted from a two-cycle gasoline engine which comprises: bringing the components of said engine, which are to be lubricated, into contact with an effective amount of a lubricant comprising at least one linear oligoester having a molecular weight of 3000 Daltons or less containing residues of a non-hindered, unbranched diol containing from 4 to 6 carbon atoms, residues of a dicarboxylic acid containing from 6 to 36 carbon atoms and optionally residues of at least one member selected from the group consisting of monocarboxylic acids and monools each having from 7 to 10 carbon atoms wherein the base stock has a smoke index of at least 75.
- 8. The method of claim 7 wherein said base stock comprises an oligoester comprised of dipropylene glycol, azelaic acid and nonanonic acid residues and wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 9. The method of claim 7 wherein said base stock comprises an oligoester comprised of dipropylene glycol, adipic acid and nonanoic acid residues and wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 10. The method of claim 7 wherein said base stock comprises an oligoester comprised of diethylene glycol, azelaic acid and nonanoic acid residues and wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 11. The method of claim 7 wherein said oligoester comprises a dimer acid ester of diethylene glycol.
- 12. The method of claim 7 further comprising an additive selected from the group consisting of extreme pressure additives, anti-foaming agents, pour point depressants, rust or corrosion prevention agents, oxidation inhibitors, detergent, dispersants, smoke-suppression agents, hydrocarbon diluents.
- 13. In a two-cycle internal combustion engine comprising lubricant, the improvement wherein said lubricant comprises at least one linear oligoester having a molecular weight of 3000 Daltons or less containing residues of a non-hindered, unbranched diol containing from 4 to 6 carbon atoms, residues of a dicarboxylic acid containing from 6 to 36 carbon atoms and optionally residues of at least one member selected from the group consisting of monocarboxylic acids and monools each having from 7 to 10 carbon atoms wherein the base stock has a smoke index of at least 75.
- 14. The two-cycle engine of claim 13 wherein said base stock comprises the oligoester comprised of dipropylene glycol, azelaic acid and nonanonic acid residues wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 15. The two-cycle engine of claim 13 wherein said base stock comprises the oligoester comprised of dipropylene glycol, adipic acid and nonanoic acid residues wherein the base stock has a viscosity of from 75-3 cSt to 20 cSt at 100.degree. C.
- 16. The two-cycle engine of claim 13 wherein said base stock comprises the oligoester comprised of diethylene glycol, azelaic acid and nonanoic acid residues and wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 17. The two-cycle engine of claim 13 wherein said oligoester comprises the dimer acid ester of diethylene glycol.
- 18. The 2-cycle engine of claim 13 further comprising an additive selected from the group consisting of extreme pressure additives, anti-foaming agents, pour point depressants, rust or corrosion prevention agents, oxidation inhibitors, detergent, dispersants, smoke-suppression agents, hydrocarbon diluents.
- 19. An ester base stock for a somkeless two-cycle engine lubricant which is a product of a process comprising: reacting a dicarboxylic acid having from 6 to 36 carbon atoms with a non-hindered, unbranched diol having from 4 to 6 carbon atoms optionally in the presence of a monocarboxylic acid or a monool each having from 7 to 10 carbon atoms to form a linear oligoester having a molecular weight of 3000 Daltons or less and a smoke index of at least 75.
- 20. The ester base stock of claim 19 wherein said base stock comprises the oligoester comprised of dipropylene glycol, azelaic acid and nonanonic acid residues wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 21. The ester base stock of claim 19 said base stock comprises the oligoester comprised of dipropylene glycol, adipic acid and nonanoic acid residues wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 22. The ester base stock of claim 19 wherein said base stock comprises the oligoester comprised of diethylene glycol, azelaic acid and nonanoic acid residues and wherein the base stock has a viscosity of from 3 cSt to 20 cSt at 100.degree. C.
- 23. The ester base stock of claim 19 wherein said oligoester comprises a dimer acid ester of diethylene glycol.
- 24. The ester base stock of claim 19 further comprising an additive selected from the group consisting of extreme pressure additives, anti-foaming agents, pour point depressants, rust or corrosion prevention agents, oxidation inhibitors, detergent, dispersants, smoke-suppression agents, hydrocarbon diluents.
BENEFIT OF EARLIER FILING DATE UNDER 35 U.S.C. .sctn.119(E)
This application claims the benefit of earlier filed and copending provisional application Ser. No. 60/002,655, filed on Aug. 22, 1995. This application is a Continuation of U.S. Ser. No. 08/679,786, filed Jul. 15, 1996, pending.
US Referenced Citations (8)
Continuations (1)
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Number |
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679786 |
Jul 1996 |
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