GB827656A - Improvements in synthetic lubricants - Google Patents

Abstract

Synthetic lubricant compositions comprise a diester of the general formula <FORM:0827656/III/1> in which R1 and R2 are alkyl groups containing at least 4 carbon atoms, R3 is an alkyl group containing 1-4 carbon atoms and R4 is an alkyl group containing at least 2 carbon atoms, and another lubricant, an anti-oxidant, anti-corrosion agent, pour-point depressor, viscosity improver or extreme pressure additive. R1 and R2 may be the same or different, and may, for example, be derived from pelargonic acid, caproic acid, lauric acid, myristic acid, palmitic acid, stearic acid, 2 - ethyl butyric acid, 2 - ethyl haxanoic acid, 2-octanoic acid and oxo acids. The diesters can be used in conjunction with a hydrocarbon lubricating oil, another synthetic ester lubricant, mineral oil or other known lubricating materials. Specification 750,650 is referred to.ALSO:Diesters having the general formula <FORM:0827656/IV (b)/1> in which R1 and R2 are alkyl groups containing at least 4 carbon atoms, R3 is an alkyl group containing 1-4 carbon atoms and R4 is an alkyl group containing at least 2 carbon atoms are prepared by reacting one molar proportion of the propane diol of the formula <FORM:0827656/IV (b)/2> with 2 molar proportions of a single monocarboxylic acid containing 5-13 carbon atoms or with a molar proportion of each of two different monocarboxylic acids. Suitable acids are, for example, pelargonic acid, caproic acid, lauric acid, myristic acid, palmitic acid, stearic acid, 2-ethyl butyric acid, 2-ethyl hexanoic acid, 2-octanoic acid and oxo acids. Suitable diols are, for example, 2.2-diethyl propane diol 1.3, 2 - methyl - 2 - n - propyl propanediol-1.3, 2 - ethyl - 2 - n - butyl propanediol - 1.3, 2-methyl - 2 - n - butyl propane diol - 1.3, and 2 - ethyl - 2 - n - propyl propanediol - 1.3. The diesters are useful as additives for lubricants (Group III). Specification 750,560, [Group III], is referred to.