Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic sulfur compound – wherein the sulfur is single bonded...
Reexamination Certificate
2001-01-30
2002-10-15
Howard, Jacqueline V. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic sulfur compound, wherein the sulfur is single bonded...
C508S518000, C508S579000
Reexamination Certificate
active
06465399
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lubricant composition, and specifically, it relates to a lubricant composition useful as an automatic transmission fluid, a continuously variable transmission fluid, etc.
2. Description of the Related Art
In recent years, accompanying actions for preventing global warming, there has been a growing trend to decrease an emission of carbon dioxide on a worldwide scale. Accordingly, it is also required to further improve fuel efficiency of automobiles. As a way of improving fuel efficiency, there is an improvement of a powertrain transferring a driving force from an engine to wheels, that is, an improvement of a transmission.
Hitherto, among automatic transmissions (AT) for automobiles dominating transmissions, a type combining a torque converter, a wet clutch, a planetary gear, etc., has been the mainstream. In recent years, a slip control AT being a further advanced AT has been developed. This aims to decrease a power loss in a torque converter by slipping a lockup clutch in a low speed region in which fluctuations in rotation of an engine are large.
In the slip control AT, since a term of continuous slip of the lockup clutch is extremely long compared to conventional ATs, an occurrence of a shudder causes a problem. The shudder means abnormal vibrations and shocks occurred in a slip of a clutch disk when the wet clutch is engaged. Since the shudder not only causes drivers uncomfortable, but also hinders a safe drive in some cases, it is strongly required to prevent such shudders from occurring. Therefore, a performance of preventing these shudders from occurring is required of lubricating oils such as an automatic transmission fluid (ATF) and a continuously variable transmission fluid (CVTF) used for an AT and a continuously variable transmission (CVT).
It is theoretically known that a lubricating oil having a property exhibiting increases in friction coefficient with increasing slip velocity are useful to prevent shudders from occurring. As lubricating oils having such a performance, lubricating oil compositions containing dithiocarbamate compounds and aliphatic acid amine condensates are disclosed in, for example, Japanese Unexamined Patent Application Publication No.11-50077. Techniques disclosed in these prior arts are not, however, satisfied as a lubricating oil having a specific property exhibiting increases in friction coefficient with increasing slip velocity.
Accordingly, the inventors of the present invention earnestly researched and have developed a lubricant composition having a specific property exhibiting increases in friction coefficient with increasing slip velocity by using a (poly)glyceryl ether and an alkaline-earth metal salt of an organic acid together.
SUMMARY OF THE INVENTION
That is, the present invention is a lubricant composition, comprising a lubricant base oil containing: a (poly)glyceryl ether represented by the following general formula (1)
(wherein R
1
represents a hydrocarbon group and n represents a numeral being 1 or more.) as a (A) component; and
an alkaline-earth metal salt of an organic acid as a (B) component.
DETAILED DESCRIPTION OF THE INVENTION
A (A) component of a lubricant composition according to the present invention is a (poly)glyceryl ether represented by the aforementioned general formula (1). In the general formula (1), R
1
represents a hydrocarbon group. As the hydrocarbon group, for example, an alkyl group, an alkenyl group, an aryl group, a cycloalkyl group, and a cycloalkenyl group are listed.
As the alkyl group, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl, tertiary butyl, pentyl, isopentyl, secondary pentyl, neopentyl, tertiary pentyl, hexyl, secondary hexyl, heptyl, secondary heptyl, octyl, 2-ethylhexyl, secondary octyl, nonyl, secondary nonyl, isononyl, decyl, secondary decyl, isodecyl, undecyl, secondary undecyl, dodecyl, secondary dodecyl, tridecyl, isotridecyl, secondary tridecyl, tetradecyl, secondary tetradecyl, hexadecyl, secondary hexadecyl, stearyl, isostearyl, icosyl, docosyl, tetracosyl, triaconsyl, 2-propylheptyl, 2-butyloctyl, 2-pentylnonyl, 2-butyldecyl, 2-hexyloctyl, 2-hexyldecyl, 2-octyldecyl, 2-heptylundecyl, 2-hexyldodecyl, 2-octyldodecyl, 2-nonyltridecyl, 2-decyltetradecyl, 2-undecylpentadecyl, 2-dodecylhexadecyl, 2-tridecylheptadecyl, 2-tetradecyloctadecyl, 2-hexadecyloctadecyl, 2-pentadecylnonadecyl, 2-hexadecyleicosyl, and monomethyl branch-isostearyl, are listed.
As the alkenyl group, for example, vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tetradecenyl, and oleyl, are listed.
As the aryl group, for example, phenyl, toluyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, dodecylphenyl, phenylphenyl, benzylphenyl, styrenated phenyl, p-cumylphenyl, dinonylphenyl, didodecylphenyl, &agr;-naphthyl, and &bgr;-naphthyl group, are listed.
As the cycloalkyl group and the cycloalkenyl group, for example, cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, methylcyclohexenyl, and methylcycloheptenyl group, are listed.
As R
1
, an alkyl group or an alkenyl group are preferable, an alkyl group or an alkenyl group having a carbon number of 4 to 30 are more preferable, and an alkyl group or an alkenyl group having a carbon number of 8 to 24 are further preferable. In the general formula (1), n is a coefficient representing a degree of polymerization of glycerin, and is a numeral being 1 or more, preferably, is a numeral being 1 to 5, and more preferably, is a numeral 1.2 to 4. In the case in which n is a numeral being 1 or more, n indicates an average value. That is, n indicates an average value of a mixture of a glyceryl ether, a diglyceryl ether, a triglyceryl ether, a tetraglyceryl ether, and so forth.
A preferable blending amount of the (A) component is 0.1 to 10% by weight relative to an entirety of the lubricant composition, and more preferably, is 0.2 to 5% by weight.
A (B) component of the lubricant composition according to the present invention is an alkaline-earth metal salt of an organic acid. As an alkaline-earth metal in the alkaline-earth metal salt of an organic acid, for example, magnesium, calcium, and barium are listed. As an organic acid, sulfonic acid, phenol, salicylic acid, etc., are preferable. Specifically, additives for lubricating oils used as additives for engine oils (detergent) described below are preferable.
As the alkaline-earth metal salt of sulfonic acid, for example, besides a (mono or di)alkylnaphthalene sulfonic acid alkaline-earth metal salt and a petroleum sulfonic acid alkaline-earth metal salt, a substituted benzene sulfonic acid alkaline-earth metal salt represented by the following general formula (B-1)
(R and R′ represent chain hydrocarbon groups having a carbon number of about 10 to 30, and M represents an alkaline-earth metal atom.) is listed.
As the alkaline-earth metal salt of phenol, for example, the one represented by the following general formula (B-2)
(R and R′ represent chain hydrocarbon groups having a carbon number of about 10 to 30, and M represents an alkaline-earth metal atom.), by the following general formula (B-3)
(R and R′ represent chain hydrocarbon groups having a carbon number of about 3 to 20, M represents an alkaline-earth metal atom, and x represents a numeral being about 1 to 5.), or by the following general formula (B-4)
(R represents a chain hydrocarbon group having a carbon number of about 3 to 20, and M represents an alkaline-earth metal atom.), are listed.
As the alkaline-earth metal salt of salicylic acid, for example, the one represented by the following general formula (B-5)
(R represents a chain hydrocarbon group having a carbon number of about 3 to 2
Koishikawa Naomi
Tatsumi Yukio
Asahi Denka Koygo Kabushiki Kaisha
Howard Jacqueline V.
Sughrue & Mion, PLLC
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