Patent GB-779698-A (GB)
Title: Lubricant
Inventor: MORTON RONALD WILLIAM
IPC: C10M169/04
Filed: 1952-12-10
Abstract: A lubricant composition comprises a blend of castor oil and a liquid carboxylic mono or diester which has a viscosity lower than that of castor oil and has no ether, sulphide, unesterified hydroxyl or unesterified carboxyl group.  The esters are formed from alcohols and mono or dicarboxylic acids or from monocarboxylic acids and glycols. Alcohols referred to are those containing 3-16 carbon atoms, e.g. aliphatic alcohols such as isopropanol, lauryl alcohols and oxo alcohols; and glycols having up to 20 carbon atoms e.g. branched chain alkylene glycols. Acids specified are fatty acids e.g. those having 8-22 carbon atoms and the ao  polymethylene dicarboxylic acids, e.g. adipic and sebacic acid.  Diesters mentioned are isopropyl oleate, di - 2 - ethyl hexyl sebacate or adipate and dinonyl sebacate or adipate.  The proportion of castor oil to ester may be between 95:5 and 5:95.  Mineral oil, for example up to 50 per cent of the composition, may be added.  Antioxidants may be added to the compositions; those referred to are phenols, aromatic nitro compounds, aromatic amines, aliphatic primary amines, organic sulphur compounds containing phosphorus and sulphur.  Phenols referred to are 2, 4, 6 - tri - t - butyl phenol, 2, 4 - methyl - 6 - t - butyl phenol, 2, 6 - di - t - butyl p - cresol, 2 - t - butyl - 4 - methoxy phenol, 3 - t - butyl - 4 - methoxy phenol, di - 2 - (4 - methyl, 6 - t - butyl phenol) methane, a - naphthol, b -naphthol, 1 - 2 - [di- -4 - (2, 6 - di - t - butyl phenol)] propane, catechol, homocatechol, hydroquinone, n - dodecyl gallate, o - hydroxy diphenyl, rufigallol and euganol.  Aromatic nitro compounds mentioned are 2, 4, 6 - trinitrophenol, onitrophenol, m - dinitrobenzene and 1, 5 - dinitronaphthalene. Aromatic amines referred to are N - lauroyl p - aminophenol, N - stearyl p - aminophenol, ophenylene diamine, b  - naphthylamine, phenyl - b  - naphthlyamine, phenyl a-naphthylamine, N - amyl p - toluidine, diethyl - a - naphthylamine, p - aminophenol, p - amino dimethylaniline, aniline and p - (di - iso - propyl) - o - methylamine phenol. Organic sulphur compounds specified are thiodiphenylamine, dithio oxamide, mercaptobenzthiazole, diphenyl thiazine, diphenyl thiophene, dibutyl thiophene, p - thiocresol and (5 methyl-2-hydroxy phenol) sulphide.  Phosphorus and sulphur containing compounds mentioned are those obtained by reacting phosphorus and sulphur either elementally or as chemical compounds with organic materials such as terpenes, e.g. a - pinene and dipentene; natural oils waxes and fats, e.g. mineral oil, sperm, lard, coconut, linseed, rapeseed and cottonseed oils, spermaceti, carnauba and candelilla wax, lanoline, lecithin and the sulphurized or chlorinated derivatives of such oils, waxes and fats; paraffins, olefins, olefin polymers, diolefins, acetylene, aromatics, alkyl aromatics, cycloaliphatics, petroleum fractions such as naphthas, heating oils or condensation products of petroleum fractions and solvent extracts of petroleum fractions. Less than 5 per cent of the antioxidant may be added. Specification 461,715 is referred to.  The Provisional Specification refers also to esters formed from ether alcohols or polyoxyalkylene glycols.