Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1995-12-06
1997-11-11
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
508480, 508483, 508502, 44389, 44400, 560 56, 560 64, 560 67, 560 73, C10M12968, C10L 118
Patent
active
056863985
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an additive for a lubricant or a fuel, an additive composition for the lubricant or the fuel, a lubricating oil composition or a fuel composition containing the additive for the lubricant or the fuel, a novel substituted hydroxyaromatic ester derivative, and a process for preparing the derivative. More specifically, the present invention relates to an additive for a lubricant useful as an excellent ashless detergent and an anti-wear agent, an additive composition for the lubricant excellent in high-temperature stability and the dispersibility of fine particles which can be used in an engine oil, particularly a diesel engine oil and a methanol engine oil compliable with future severe exhaust gas controls, and a lubricating oil composition containing the above-mentioned additive for the lubricant. Furthermore, the present invention relates to an additive for a fuel which is useful as an excellent ashless detergent and is excellent in wear resistance of an injection pump and storage stability to a fuel containing a particulate reducer, an additive composition for a fuel which is excellent in high-temperature stability, has the dispersibility of fine particles, and is useful as an excellent ashless detergent dispersant for a fuel oil, and a fuel composition containing the additive for the fuel. In addition, the present invention also relates to a novel substituted hydroxyaromatic ester derivative which is useful as an ashless detergent having excellent high-temperature stability in place of a conventional metal detergent, and a process for efficiently preparing the derivative.
BACKGROUND ART
Examples of conventional ashless dispersants usually include succinimido-containing dispersants and hydroxybenzylamine (Mannich base)-containing dispersants, and importance has been attached to their remarkable fine particles dispersion function. For this reason, they have been widely used as additives for gasoline and a diesel engine oil. Moreover, it has been confirmed that they can exert a synergistic effect with a zinc dialkyldithiophosphate and a metal detergent, and therefore they have been utilized as the extremely important additives for the lubricant.
In recent years, however, it has often been indicated that these dispersants are poor in high-temperature stability (high-temperature detergency).
A conventional lubricating oil for an internal combustion engine is usually constituted of a base oil, an ashless dispersant such as polybutenylsuccinimide, a metal detergent such as a sulfonate or a phenate of an alkaline earth metal and a wear-resisting agent such as a zinc alkyldithiophosphate, but there has been a problem that oxides and sulfates are produced from metals in the additive components by combustion to cause environmental pollution.
Nowadays, in an internal combustion engine, particularly a diesel engine, measures against the environmental pollution attributable to particulates, NO.sub.x and the like in an exhaust gas are important themes. As these measures, exhaust gas purifying devices such as a particulate trap and an NO.sub.x removing catalyst have been used, but a conventional lubricating oil for the internal combustion engine is accompanied with a problem of clogging by metal oxides and sulfides produced during combustion. Therefore, a lubricant for the internal combustion engine has been required which permits minimizing the exhaust of these metal oxides and sulfides.
Furthermore, as one resolution of the future measures against the exhaust gas, much attention has been paid to a methanol engine. In the diesel engine, a gas oil is injected into the engine by an injection pump, but lubrication in the pump is self-lubrication by the gas oil itself. On the contrary, in the case of the methanol engine, an engine oil is usually injected into the injection pump, because the lubrication of methanol itself is low. In this case, the compatibility of methanol with the engine oil is poor, so that an additive is deposited in methanol. Particularly in the case t
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Smalheer et al, "Lubricant Additives", pp. 1-11, 1967.
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Gotoh Masahisa
Ikeda Harutomo
Koshima Hiroaki
Minokami Tomiyasu
Idemitsu Kosan Co. Ltd.
McAvoy Ellen M.
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