GB627865A - An improved mineral oil composition - Google Patents

Abstract

Low-pour test mineral oil compositions comprise a major proportion of a waxy mineral oil, e.g. a lubricating oil, a pour-depressing amount of a high molecular weight condensation product of a long-chain aliphatic compound having at least 10 carbon atoms in the molecule with an aromatic hydrocarbon or a hydroxy or amino derivative thereof, and a pour stability promoting amount of a condensation product prepared (see Group IV (b)) by heat-thickening at about 400 DEG to 750 DEG F., a compound of the formula R-COX, where R is a member of the class consisting of alkyl and aryl alkyl radicals having at least 10 carbon atoms in an aliphatic chain, e.g. the stearyl radical, and X is a halogen, e.g. chlorine. The composition may contain about 0.1-2.0 per cent, e.g. 1.0 to 1.25 per cent of a high mol. wt. condensation product of a chlorinated paraffin wax with naphthalene and about 0.01 to 1.5 per cent, e.g. 0.5-0.75 per cent of stearyl chloride heat-thickened at 400 DEG to 750 DEG F. The aromatic compound used in making the alkyl-aromatic condensation product may be diphenyl, benzene, toluene, amyl-benzene, anthracene, phenol, naphthol, cresol, aniline or xylidine. The long chain aliphatic compound is preferably paraffin wax chlorinated to about 10-20 per cent chlorine content. Alternatively the chlorinated wax may be dehydrochlorinated to produce corresponding olefines and the latter may be condensed with the aromatic compound. Alternative long chain aliphatic compounds which may be used are stearic acid, stearyl chloride, octadecyl alcohol, or cetyl alcohol. The acyl halide used in the preparation of the other condensation product may be prepared from palmitic or behenic acid or mixtures of acids obtained by the oxidation of paraffin wax. The oil base stocks may be waxy paraffinic or mixed base mineral oils and may have been partially dewaxed. Their viscosity may lie within the normal range for lubricating oils or may be of much lower viscosity, e.g. hydraulic oils of viscosity as low as 40 s.u.s. at 100 DEG F. U.S.A. Specifications 1,815,022 and 2,251,550 are referred to.ALSO:Condensation products which may be used as additives in mineral lubricating &c. oils (see Group III) are prepared by heat-thickening at about 400-750 DEG F. compounds of the formula R-COX, where R is an alkyl or aralkyl radical having at least 10 carbon atoms in an aliphatic chain, and X is a halogen. In the example stearyl chloride is heated for 3 hours at 580 DEG C. until the evolution of hydrogen chloride has ceased and the heat-thickened product heated to 600 DEG F. at 10-20 mm. mercury pressure to remove volatile impurities. Alternatively, the acyl halide may be prepared from palmitic, behenic or paraffin wax oxidation acids, and after heat thickening, the product may be dissolved in a solvent and washed free from acid prior to heating under reduced pressure. U.S.A. Specification 2,251,550 is referred to.