Claims
- 1. A method of lubrication which consists of applying to the structure to be lubricated a synthetic oil which comprises as the active ingredient a mixture of monoalkylnaphthalenes represented by the following general formulae, ##STR2## Wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a straight-chain alkyl group and the total of the carbon atoms in R.sub.1 and R.sub.2 or in R.sub.3 and R.sub.4 is 5 to 23, and the molar ratio of .alpha.-substituted monoalkylnaphthalenes to .beta.-substituted monoalkylnaphthalenes being at least 1.0.
- 2. A method according to claim 1, wherein the said molar ratio is 1.0 to 2.0.
- 3. A method according to claim 1, wherein said total of the carbon atoms in R.sub.1 and R.sub.2 or in R.sub.3 and R.sub.4 in 7 to 13.
- 4. A lubricating oil composition containing as the active ingredient a mixture of monoalkylnaphthalenes represented by the following general formulae, ##STR3## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a straight-chain alkyl group and the total of the carbon atoms in R.sub.1 and R.sub.2 or in R.sub.3 and R4 is 5 to 23, and the molar ratio of .alpha.-substituted monoalkylnaphthalenes to .beta.-substituted monoalkylnaphthalenes being at least 1.0.
- 5. A lubricating oil composition according to claim 4 which further comprises at least one of a lubricating oil and a mineral oil, said mineral oil or lubricating oil being in the amount of 25-75% by weight.
- 6. A lubricating oil composition according to claim 4 which consists of:
- 19 mol % of .alpha.--(1-methylnonyl) naphthalene;
- 16 mol % of .alpha.--(1-ethyloctyl) naphthalene;
- 12 mol % of .alpha.--(1-propylheptyl) naphthalene;
- 10 mol % of .alpha.--(1-butylhexyl) naphthalene; and
- 12 mol % of .beta.--(1-methylnonyl) naphthalene;
- 11 mol % of .beta.--(1-ethyloctyl) naphthalene;
- 10 mol % of .beta.--(1-propylheptyl) naphthalene;
- 10mol % of .beta.--(1-butylhexyl) naphthalene
- 7. A lubricating oil composition according to claim 4 which consists of:
- 29 mol % of .alpha.--(1-methylheptyl) naphthalene;
- 17 mol % of .alpha.--(1-ethylhexyl) naphthalene;
- 13 mol % of .alpha.--(1-propylpentyl) naphthalene; and
- 17 mol % of .beta.--(1-methylheptyl) naphthalene;
- 12 mol % of .beta.--(1-ethylhexyl) naphthalene;
- 12 mol % of .beta.--(1-propylpentyl) naphthalene;
- 8. A lubricating oil composition according to claim 4 which consists of:
- 18 mol % of .alpha.--(1-methylpentadecyl) naphthalene;
- 10 mol % of .alpha.--(1-ethyltetradecyl) naphthalene;
- 7 mol % of .alpha.--(1-propyltridecyl) naphthalene;
- 5 mol % of .alpha.--(1-butyldodecyl) naphthalene;
- 22 mol % of .alpha.--(1-pentylundecyl) naphthalene,
- .alpha.--(1-hexyldecyl) naphthalene,
- .alpha.--(1-heptylnonyl) naphthalene;
- and
- 12 mol % of .beta.--(1-methylpentadecyl) naphthalene;
- 7 mol % of .beta.--(1-ethyltetradecyl) naphthalene;
- 4 mol % of .beta.--(1-propyltridecyl) naphthalene;
- 2 mol % of .beta.--(1-butyldodecyl) naphthalene;
- 13 mol % of .beta.--(1-pentylundecyl) naphthalene,
- .beta.--(1-hexyldecyl) naphthalene,
- .beta.--(1-heptylnonyl) naphthalene.
- 9. A method of improving the oxidation stability of a thermal medium oil which consists of using a composition consisting essentially of a mixture of monoalkylnaphthalenes represented by the following general formulae, ##STR4## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a straight-chain alkyl group and the total of the carbon atoms in R.sub.1 and R.sub.2 or in R.sub.3 and R.sub.4 is 5 to 23, and the molar ratio of .alpha.-substituted monoalkylnaphthalenes to .beta.-substituted monoalkylnaphthalenes being at least 1.0.
- 10. A method according to claim 9, wherein the said molar ratio is 1.0 to 2.0.
- 11. A method according to claim 9, wherein said total of the carbon atoms in R.sub.1 and R.sub.2 or in R.sub.3 and R.sub.4 is 7 to 13.
- 12. A thermal medium oil consisting essentially of a mixture of monoalkylnaphthalenes represented by the following general formulae, ##STR5## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a straight-chain alkyl group and the total of the carbon atoms in R.sub.1 and R.sub.2 or in R.sub.3 and R.sub.4 is 5 to 23, and the molar ratio of .alpha.-substituted monoalkylnaphthalenes to .beta.-substituted monoalkylnaphthalenes being at least 1.0.
Priority Claims (2)
Number |
Date |
Country |
Kind |
59-249771 |
Nov 1984 |
JPX |
|
59-249773 |
Nov 1984 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 799,405 filed Nov. 19, 1985 now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1274097 |
Aug 1968 |
DEX |
635122 |
Dec 1976 |
SUX |
Continuations (1)
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Number |
Date |
Country |
Parent |
799405 |
Nov 1985 |
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