Organoammonium tungstate and molybate compounds, and process for preparing such compounds
View Patent ↗Novel organoammonium compounds are provided, which are useful as additives for improving the antiwear and friction-reducing properties of lubricating compositions. The compound is formed by reacting a metal acid hydrate with one or more alkyl amines. Particular examples are the preparation of ditridecylammonium tungstate, di-n-octylammonium tungstate and ditridecylammonium molybdate.
1. A lubricating composition comprising
(a) a major amount of a lubricating oil, and
(b) about 0.025 to 5.0 wt.-%, based on the total weight of the lubricating composition, of an organoammonium salt of a Group VI metal, comprising the reaction product of a metal acid hydrate of formula MO 4 H 2 ·H 2 O with at least one alkyl amine of the formula R 1 R 2 NH wherein R 1 and R 2 may be identical or different and comprise at least one linear or branched, saturated or unsaturated C 8 -C 40 alkyl group, wherein M is tungsten.
2. The lubricating composition of claim 1 , wherein the concentration of the organoammonium salt is between about 0.05 to 2.0 wt.-%.
3. The lubricating composition of claim 2 , wherein the concentration of the organoammonium salt is between about 0.09 to 0.5 wt.-%.
4. The lubricating composition of claim 1 wherein R 1 and R 2 may be identical or different and R 1 or R 2 comprises at least one linear or branched, saturated or unsaturated C 8-13 alkyl group.
5. The lubricating composition of claim 1 wherein R 1 and R 2 comprise at least one C 8 alkyl group.
6. The lubricating composition of claim 1 wherein R 1 and R 2 comprise at least one C 13 alkyl group.
7. The lubricating composition of claim 1 wherein the R 1 R 2 NH comprises di-tridecylamine.
8. The lubricating composition of claim 7 wherein the organoammonium salt comprises di-tridecylammonium tungstate.
9. The lubricating composition of claim 1 wherein the R 1 R 2 NH comprises di-n-octylamine.
10. The lubricating composition of claim 9 wherein the organoammonium salt comprises di-n-octylammonium tungstate.