Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Heterocyclic ring compound; a heterocyclic ring is one...
Patent
1997-02-07
1997-12-09
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Heterocyclic ring compound; a heterocyclic ring is one...
508460, 508516, C10M15920, C10M15924
Patent
active
056960620
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns colloidal products containing calcium and/or magnesium, also bismuth, modified by the action of acids containing sulphur and, optionally, nitrogen.
BACKGROUND OF THE INVENTION
In the French patent application entitled "Novel sulphonated compounds of bismuth, their preparation and use, in particular the preparation of overbased colloidal products which can be used as lubricant additives" deposited on the same day, the applicant described overbased colloidal products containing bismuth, which are compatible with hydrocarbon oils and can be used as additives with an antiwear and extreme-pressure action in lubricants. Those overbased colloidal products containing bismuth are obtained by carbonation of at least one calcium, barium or magnesium oxide or hydroxide, the calcium, barium or magnesium carbonate being maintained in a colloidal dispersion in the form of micelles in an organic medium by at least one sulphonated bismuth compound with one of the following general formulae: ##STR1## the preparation of which is described in the same French patent application.
The overbased colloidal products of the present parallel application can be used as antiwear and extreme-pressure additives in mineral or synthetic lubricating oils and in greases.
SUMMARY OF THE INVENTION
We have now discovered that it is possible to modify these products to increase their sulphur content by partial or complete neutralization of their basicity reserve using at least one acid containing sulphur and, optionally, nitrogen, neutralization not affecting the colloidal nature of the products formed.
The colloidal products of the present invention can be defined in general as being produced by a process which comprises at least partial neutralisation of the basicity reserve of an overbased colloidal product comprising calcium, barium or magnesium carbonate dispersed in micellar form in an organic medium by at least one sulphonated bismuth compound with one of the following general formulae: ##STR2## where R.sup.1 represents a linear or branched monovalent aliphatic hydrocarbon radical containing 8 to 36 carbon atoms and R.sup.2 represents a hydrogen atom or a linear or branched monovalent aliphatic hydrocarbon radical containing 8 to 36 carbon atoms, said at least partial neutralization being carried out by means of at least one carboxylic acid containing sulphur or at least one carboxylic acid containing sulphur and nitrogen.
The overbased colloidal starting products generally have a basicity reserve in the form of calcium, barium or magnesium carbonate represented by a TBN (total base number) of up to about 550 mg of potassium/g of product (i.e., up to about 10 basic meq/g).
More particularly, the invention includes sulphur-containing carboxylic acids which are termed "short sulphur-containing carboxylic acids", having the general formula: for example an alkylene radical containing 1 to 6 carbon atoms; or a phenylidene radical, R.sup.5 represents a single bond or a divalent hydrocarbon radical, for example an alkylene radical containing 1 to 4 carbon atoms, X represents a hydrogen atom or a carboxylic group; x and y each have an average value of 1 to 4 when R.sup.5 is a divalent hydrocarbon radical and the sum (x+y) has an average value of 1 to 4 when R.sup.5 represents a single bond.
More particularly, when R.sup.5 is a single bond and X represents COOH, the sulphur-containing carboxylic acids have the following form: -dipropionic and -dibutyric acids, also 2,2'-dithiodibenzoic acid.
When R.sup.5 is a divalent hydrocarbon radical and X is a carboxylic group, the acids are of the form: trithio-acetic) acids and methylene- and ethylene-bis(thio-, dithio- and trithio-propionic) acids.
Finally, when R.sup.5 is a single bond and X is a hydrogen atom, the acids have the form: -butyric acids.
Carboxylic acids of this type have already been described in our French patent FR-A-2 689 031.
Particular carboxylic acids containing sulphur and nitrogen which can be used in the process for the p
REFERENCES:
patent: 3929650 (1975-12-01), King et al.
patent: 4198317 (1980-04-01), Bertus et al.
patent: 4468339 (1984-08-01), Rysek et al.
patent: 5536424 (1996-07-01), Delfort et al.
Born Maurice
Daoudal Bertrand
Delfort Bruno
Lallement Jacques
Howard Jacqueline V.
Institut Francais du Pe'trole
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