Compositions – Electrolytes for electrical devices
Patent
1988-08-26
1989-10-24
Dixon, Jr., William R.
Compositions
Electrolytes for electrical devices
252 486, C10M13526, C10M13522
Patent
active
048760218
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to lubricating oil compositions and in particular to lubricating oil compositions containing anti-wear/anti-corrosion additives.
The severe demands placed upon lubricating oils by modern internal combustion engines necessitate incorporation into the lubricating oil of additives of various types, for example dispersants, detergents, anti-oxidants, anti-wear (A.W.) agents, extreme pressure (E.P.) agents, and the like. Generally, each additive agent is employed to impart a particular characteristic to the base oil so as to afford a finished lubricating oil composition which is oxidation resistant, stable and non-corrosive to bearing metals, and which effectively reduces varnish and sludge forming tendencies and minimises frictional and corrosive wear.
The use of zinc dialkyl dithiophosphates (ZDTPs) as additives in lubricating oils for the purpose of improving the wear and corrosion characteristics of the oil has long been known from, for example GB Pat. Nos. 957,017: 1,358,478 and 1,565,961.
Despite the fact that ZDTPs have been very effective and very successful in a number of engine lubricating oils, it is presently considered desirable to replace them with ashless additives for the purpose of reducing environmental pollution.
One class of compound proposed for this purpose are the hydrocarbon polysulphide derivatives of 2,5-dimercapto-1,3,4-thiadiazole having the general formula: ##STR2## wherein R and R.sup.1 are the same or different hydrocarbon radicals, x and y are numbers 0 to about 8, the sum of x and y is at least one, and preferably 2 to about 16. Such compounds are described in U.S. Pat. Nos. 2,719,125; 2,719,126 and 3,663,561. One of these compounds of formula: ##STR3## has achieved some commercial importance.
We have now found that bisacyldisulphides and bisaroyldisulphides are another class of compounds which are capable of matching zinc dialkyl dithiophosphates in EP/AW activity and can be non-corrosive to copper.
Accordingly, the present invention provides a finished lubricating oil composition comprising a lubricating oil base stock and an EP/AW improving amount of a bisacyl- or bisaroyldisulphide.
The lubricating oil base stock may be any oil of lubricating viscosity, which may be a mineral oil or a synthetic lubricating oil. Suitable mineral oils include both solvent extracted or solvent refined oils obtained in accordance with conventional methods of treating lubricating oils. The base oil may be derived from paraffinic, naphthenic, asphaltic or mixed base crudes. Alternatively, the base oil may be a synthetic oil, or a mixture thereof with mineral oil.
Bisacyl- or bisaroyldisulphides have the general formula: ##STR4## wherein R is independently a hydrocarbyl or substituted hydrocarbyl group. Suitably the group R may be an alkyl, cycloalkyl, alkenyl, aryl, aralkyl or alkaryl group. Preferably the group R is an aliphatic hydrocarbyl group, more preferably an alkyl group, suitably containing greater than 5, for example, from 5 to 20 carbon atoms. Examples of suitable alkyl groups include n-heptyl, n-pentyl, 2-ethyl pentyl, oleyl (C.sub.17 H.sub.33 -) and 2-ethylhexyl. An example of a suitable alkenyl group is 9-octadecenyl.
Bisacyldisulphides for use in the compositions of the invention may suitably be prepared by the method described by Kodomari et al in Synthesis, 1981, 637-8. Bisaroyldisulphides may be similarly prepared.
The lubricating oil composition may suitably contain from 0.01 to 10, preferably from 0.1 to 1% w/w of the bisacyl- or bisaroyldisulphide, the remainder of the composition being comprised of the lubricating oil base stock.
In addition, the lubricating oil composition may contain conventional additives, for example dispersants, detergents, VI improvers, anti-oxidants, pour-point depressants, or the like.
Lubricating oil additives are generally manufactured and marketed in the form of a concentrate for subsequent blending into finished lubricating oils.
In another embodiment of the invention there is provided a lubricating oil additive conce
REFERENCES:
patent: 2398202 (1946-04-01), Zublin et al.
patent: 2520748 (1950-08-01), Vaughan et al.
patent: 4250046 (1981-02-01), Przybylinski
BP Chemicals Limited
Dixon Jr. William R.
Nguyen Maria
LandOfFree
Lubricating oil compositions containing anti-wear/anti-corrosion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lubricating oil compositions containing anti-wear/anti-corrosion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lubricating oil compositions containing anti-wear/anti-corrosion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1587496