Patent GB-813484-A (GB)
Title: A lubricant composition
IPC: C07F9/12
Filed: 1956-05-18
Abstract: A lubricating oil composition comprises a polyester lubricating oil and a minor proportion (e.g. 0.5 to 5 per cent wt.) or di (o-chlorophenyl) phenyl phosphate.  The polyester base oil may be (i) an aliphatic di-ester of an organic dicarboxylic acid, e.g. di-(2-ethylhexyl) sebacate or di-2-(21-butoxyethoxy) ethyl alkenylsuccinate; (ii) the reaction product of an aliphatic dicarboxylic acid, a glycol, and either an aliphatic monohydroxy alcohol or an aliphatic monocarboxylic acid, e.g. the reaction product of adipic acid, diethylene glycol and 2-ethylhexanoic acid (see Group IV (a)); (iii) the diester of a glycol and a monocarboxylic acid, e.g. triethylene glycol di-laurate or 1,4-hexanediol di-laurate; or (iv) the sulphur analogues of any of the above, many examples of each class being given.  Optional ingredients are viscosity index improvers, e.g. methacrylate polymers, antioxidants, e.g. phenothiazine, and metal deactivators such as Schiff's base reaction products of an aliphatic diprimary amine (1 mol.) with an aromatic aldehyde (2 mols.) having the formula A-CH=N-R-N=CH-A, where A is an aromatic nucleus and R is an aliphatic radical with the 2 N atoms attached to different carbon atoms thereof, e.g. disalicylal propylene diamine (many other examples given).  In examples di(o-chloro-phenyl) phenyl phosphate, a methacrylate polymer, and phenothiazine are incorporated in (a) di-iso-octyl azelate, with or without a minor proportion of disalicylal-1,2-diaminopropane; and (b) di (2-ethyl-hexyl) sebacate with or without a trace of kerosene concentrate of dimethyl silicone. The effectiveness of di (o-chlorophenyl) phenyl phosphate as an additive is contrasted with that of diphenyl-o-chlorophenyl phosphate, di-o-chlorophenyl phosphate, di (b -chloro-ethyl) 2-ethylhexyl phosphate and tris (trichloropropyl) phosphate.ALSO:A lubricating oil composition (see Group III) comprises a polyester lubricating oil and a minor proportion (e.g. 0.2 to 5 per cent weight) of di-(-chlorophenyl) phenyl phosphate.  The polyester base oil may be formed by reacting an aliphatic dicarboxylic acid, a glycol with either an aliphatic monohydroxy alcohol or an aliphatic monocarboxylic acid in a molar ratio of difunctional compounds between 1.25 and 2.0, e.g. the reaction products of 2-ethyl-1,3-hexanediol, sebacic acid and 2-ethylhexanol (molar ratio of sebacid acid : glycol=1.83) and of adipic acid, diethyleneglycol and 2-ethylhexanoic acid (molar ratio of glycol : adipic acid= 1.4). The thio-analogues of such polyesters are also suitable e.g. the reaction product of adipic acid, thioglycol and 2-ethylhexyl mercaptan.  Optional ingredients are viscosity index improvers, e.g. methacrylate polymers, antioxidants, e.g. phenothiazine and metal deactivators such as Schiff's base reaction products of an aliphatic diprimary amine (1 mol) with an aromatic aldehyde (2 mols.) having the formula A-CH=N-R-N=CH-A where A is an aromatic nucleus and R is an aliphatic radiant with 2 N atoms attached to different carbon atoms, e.g. disalicyclal propylene diamine (many other examples given).  In examples, the effectiveness of di - (o - chlorophenyl) phenyl phosphate as an additive is contrasted with that of diphenyl o - chlorophenyl phosphate, di-o-chlorophenyl phosphate, di - (b  - chloro - ethyl) 2 - ethylhexyl phosphate and Tris-(trichloropropyl) phosphate.