Claims
- 1. An improved gear oil comprising:
- a) a base oil having a kinematic viscosity at 100.degree. C. ranging from about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) about 0.1 to about 10 percent by weight of a polymer comprising the following monomers:
- (i) a C1-C6 alkylmethacrylate of the formula: ##STR6## where R.sup.1 is alkyl of 1 to 6 carbon atoms; (ii) a C7-C14 alkylmethacrylate of the formula: ##STR7## where R.sup.2 is alkyl of 7 to 14 carbon atoms; (iii) A C15-C20 alkylmethacrylate of the formula: ##STR8## where R.sup.3 is alkyl of 15-20 carbon atoms; and (iv) a N,N-dialkylaminoalkyl(meth)acrylamide of the formula: ##STR9## where R.sup.4 is hydrogen or a lower alkyl group; R.sup.5 or R.sup.6 are hydrogen or a hydrocarbon selected from the group consisting of alkyl, aralkyl cycloalkyl, aryl and alkaryl, including such radicals when inertly substituted; R" is a hydrocarbon group selected from the group consisting of alkylene, aralkylene, cycloalkylene, arylene and alkarylene, including such radicals when inertly substituted; and A is selected from --O--, --S-- and --NH--;
- wherein said polymer comprises 0 to 50 percent by weight of said C1-C6 alkylmethacrylate, 30-85 percent by weight of said C7-C14 alkylmethacrylate, 3-50 percent by weight of said C15-C20 alkylmethacrylate and 2-10 percent by weight of said N,N dialkylaminoalkyl(meth)acrylamide and
- c) at least one gear performance additive.
- 2. The gear oil according to claim 1 wherein said gear performance additive is at least one extreme pressure agent that contains at least 25 percent by weight sulfur.
- 3. The gear oil according to claim 2 wherein said extreme pressure agent is present in said gear oil at a level to result in 1,000 to 30,000 ppm sulfur in said gear oil from said extreme pressure agent.
- 4. The gear oil according to claim 3 wherein said gear oil contains 10,000 to 25,000 ppm sulfur from said extreme pressure agent.
- 5. The gear oil according to claim 4 wherein said gear oil contains 15,000 to 25,000 ppm sulfur from said extreme pressure agent.
- 6. The gear oil according to claim 1 wherein R.sup.5 and R.sup.6 are selected from methyl, ethyl, n-propyl, i-propyl, butyls, amyls, hexyls, octyls, and decyls.
- 7. The gear oil according to claim 1 wherein said N,N-dialkylamninoalkyl(meth)acrylamide is selected from N,N-diethylaminopropylmethacrylamide and N,N-dimethylaminoethylacrylamide.
- 8. The gear oil according to claim 1 wherein said gear oil gear performance additive is at a concentration from 3.0 to 10 percent by weight.
- 9. The gear oil according to claim 1 wherein said gear oil has a Brookfield Viscosity at -12.degree. C. ranging from 1,000 to 150,000 cP.
- 10. The gear oil according to claim 1 wherein said gear oil has a Brookfield Viscosity at -26.degree. C. ranging from 1,000 to 150,000 cP.
- 11. The gear oil according to claim 1 wherein said gear oil is essentially devoid of carboxylic-type ashless dispersants.
- 12. The gear oil according to claim 1 wherein said gear oil is from 88.0 to 98.5 percent by weight of said base oil.
- 13. The gear oil according to claim 1 wherein said gear oil is essentially free of metal-containing additive components.
- 14. The gear oil according to claim 1 wherein said gear oil has a maximum concentration of metal of about 25 ppm.
- 15. The gear oil according to claim 1 wherein said polymer is at a concentration of 0.1 to 3.0 percent by weight.
- 16. The gear oil according to claim 1 wherein said base oil has a flash point temperature ranging from 200.degree. to 700.degree. F.
- 17. The gear oil according to claim 1 wherein R.sup.5 and R.sup.6 are selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, amyl, octyl, decyl, octadecyl, benzyl, beta-phenylethyl, cyclohexyl, cycloheptyl, cyclooctyl, 2-methylcycloheptyl, 3-butylcyclohexyl, 1,3-methlcyclohexyl, tolyl, xylyl, 2-ethoxyethyl, carboethoxymethyl and 4-methylcyclohexyl.
- 18. A lubricant essentially devoid of carboxylic ashless dispersants comprising:
- a) a base oil having a kinematic viscosity at 100.degree. C. ranging from about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) a dispersant Viscosity Index Improver at a concentration of from 0.1 to 10.0 percent by weight; and
- c) a gear performance additive at a concentration of from 3.0 to 10 percent by weight and wherein said additive is at least one extreme pressure agent containing at least 25 percent by weight sulfur; and wherein the resulting lubricant has a Brookfield Viscosity at -12.degree. C. ranging from about 1,000 to about 150,000 cP.
- 19. The lubricant according to claim 18 wherein said resulting lubricant has a Brookfield Viscosity at -26.degree. C. ranging from about 1,000 to about 150,000 cP.
- 20. The lubricant of claim 18 wherein said lubricant comprises from about 0.1 to about 3.0 percent by weight of said dispersant Viscosity Index Improver.
- 21. The lubricant of claim 18 additionally comprising a dispersant pour point depressant.
- 22. The lubricant of claim 18 wherein said lubricant contains from about 88.0 to about 98.5 percent by weight of said base oil.
- 23. A method for reducing the carbon and varnish production in a lubricated axle or manual transmission, said method comprising the use of a gear oil comprising:
- a) a base oil in the amount of about 88.0 to about 98.5 percent by weight, said base oil having a kinematic viscosity at 100.degree. C. ranging from about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) about 0.1 to about 10 percent by weight of a polymer comprising the following monomers:
- (i) a C1-C6 alkylmethacrylate of the formula: ##STR10## where R.sup.1 is alkyl of 1 to 6 carbon atoms; (ii) a C7-C14 alkylmethacrylate of the formula: ##STR11## where R.sup.2 is alkyl of 7 to 14 carbon atoms; (iii) A C1-C20 alkylmethacrylate of the formula: ##STR12## where R.sup.3 is alkyl of 15-20 carbon atoms; and (iv) a N,N-dialkylaminoalkyl(meth)acrylamide of the formula: ##STR13## where R.sup.4 is hydrogen or a lower alkyl group; R.sup.5 or R.sup.6 are hydrogen or a hydrocarbon selected from the group consisting of alkyl, aralkyl cycloalkyl, aryl and alkaryl, including such radicals when inertly substituted; R" is a hydrocarbon group selected from the group consisting of alkylene, aralkylene, cycloalkylene, arylene and alkarylene, including such radicals when inertly substituted; and A is selected from --O--, --S-- and --NH--;
- wherein said polymer comprises 0 to 50 percent by weight of said C1-C6 alkylmethacrylate, 30-85 percent by weight of said C7-C14 alkylmethacrylate, 3-50 percent by weight of said C15-C20 alkylmethacrylate and 2-10 percent by weight of said N,N dialkylaminoalkyl(meth)acrylamide and
- c) about 0.1 to 10 percent by weight of an extreme pressure agent containing at least 25 percent by weight sulfur.
- 24. A lubricant comprising:
- a) a base oil in the amount of about 88.0 to about 96.0 percent by weight, said base oil having a kinematic viscosity at 100.degree. C. of about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) a dispersant pour point depressant in the amount of about 0.1 to about 3.0 percent by weight; and
- c) a gear performance additive in the amount of about 3.0 to about 10.0 percent by weight and wherein said additive is at least one extreme pressure agent containing at least 25 percent by weight sulfur; and wherein the resulting lubricant has a Brookfield viscosity at -12.degree. C. ranging from about 1,000 up to about 150,000 cP.
- 25. The lubricant according to claim 24 wherein said resulting lubricant has a Brookfield Viscosity at -26.degree. C. ranging from about 1,000 up to about 150,000 cP.
- 26. The lubricant according to claim 24 wherein said lubricant is essentially free of carboxylic-type ashless dispersants.
- 27. A gear oil comprising:
- a) a base oil having a kinematic viscosity at 100.degree. C. ranging from about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) a combination of a dispersant pour point depressant and a dispersant Viscosity Index Improver, said combination being at a concentration for 0.1 to 3.0 percent by weight; and
- c) at least one extreme pressure agent at a concentration from 3.0 to 10 percent by weight and wherein said extreme pressure agent is at least 30 percent by weight sulfur; and wherein the resulting gear oil has a Brookfield Viscosity at -12.degree. C. ranging from about 1,000 to about 150,000 cP.
- 28. The gear oil according to claim 27 wherein said gear oil is essentially free of carboxylic-type ashless dispersants and Mannich base dispersants.
- 29. The gear oil according to claim 28 wherein said gear oil contains from about 88.0 to about 98.5 percent by weight of said base oil.
- 30. The gear oil according to claim 28 wherein said gear oil comprises from about 1.0 to about 3.0 percent by weight of said combination of said dispersant pour point depressant and dispersant Viscosity Index Improver.
- 31. A gear oil having a Brookfield Viscosity at -12.degree. C. or -26.degree. C. ranging from about 1,000 up to about 150,000 cP, said gear oil comprising:
- a) a base oil in the amount of about 88.0 to about 98.5 percent by weight; said base oil having a kinematic viscosity at 100.degree. C. of about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) a functionalized poly(meth)acrylate (PMA) in the amount of about 0.1 to about 3.0 percent by weight; and
- c) a gear performance additive containing at least 25 percent by weight sulfur in the amount of about 3.0 to about 10.0 percent by weight.
- 32. The gear oil of claim 31 wherein said gear oil contains about 500 to 2500 ppm phosphorous, about 1000 to 30,000 ppm sulfur and about 0 to 500 ppm boron.
- 33. The gear oil of claim 32 wherein said gear performance additive is an ashless oil-soluble additive and contains at least 30% by weight sulfur.
- 34. The gear oil of claim 33 wherein said gear oil is essentially free of carboxylic-type ashless dispersants.
- 35. The gear oil of claim 34 wherein said gear oil has a maximum concentration of metal of about 25 ppm.
- 36. A method for reducing the sludge production in a lubricated gear box or axle comprising adding to said gear box or axle:
- a) a base oil in the amount of about 88.0 to about 96 percent by weight, said base oil having a kinematic viscosity at 100.degree. C. ranging from about 4.0 to about 41.0 cSt and a Viscosity Index ranging from about 60 to about 140;
- b) about 0.1 to about 10 percent by weight of a polymer comprising the following monomers:
- (i) a C1-C6 alkylmethacrylate of the formula: ##STR14## where R.sup.1 is alkyl of 1 to 6 carbon atoms; (ii) a C7-C14 alkylmethacrylate of the formula: ##STR15## where R.sup.2 is alkyl of 7 to 14 carbon atoms; (iii) A C15-C20 alkylmethacrylate of the formula: ##STR16## where R.sup.3 is alkyl of 15-20 carbon atoms; and (iv) a N,N-dialkylaminoalkyl(meth)acrylamide of the formula: ##STR17## where R.sup.4 is hydrogen or a lower alkyl group; R.sup.5 or R.sup.6 are hydrogen or a hydrocarbon selected from the group consisting of alkyl, aralkyl cycloalkyl, aryl and alkaryl, including such radicals when inertly substituted; R" is a hydrocarbon group selected from the group consisting of alkylene, aralkylene, cycloalkylene, arylene and alkarylene, including such radicals when inertly substituted; and A is selected from --O--, --S-- and --NH--; and
- wherein said polymer comprises 0 to 50 percent by weight of said C1-C6 alkylmethacrylate, 30-85 percent by weight of said C7-C14 alkylmethacrylate, 3-50 percent by weight of said C15-C20 alkylmethacrylate and 2-10 percent by weight of said N,N dialkylaminoalkyl(meth)acrylamide and
- c) about 0.1 to 10 percent by weight of an extreme pressure agent containing at least 25% by weight sulfur.
RELATED U.S. APPLICATION DATA
This application is a continuation-in-part of application Ser. No.: 08/662,396 filed Jun. 12, 1996, now abandoned.
US Referenced Citations (21)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 436 872 B1 |
Sep 1993 |
EPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
662396 |
Jun 1996 |
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