Patent GB-763611-A (GB)
Title: Improvements in or relating to synthetic lubricating compositions
Inventor: JENSEN HANS CHRISTIAN HENRY
Filed: 1953-10-29
Abstract: A composition comprising a diester of a C2-C40 dicarboxylic acid having dissolved therein 0.01-10 per cent by weight, based on the total composition, of one or more halogen and/or sulphur-containing hydrocarbon polymers or copolymers thereof, is employed as a lubricating composition (see Group III). The dicarboxylic acid may be a straight- or branched-chain, saturated or unsaturated acid and may contain at least one ether or thioether linkage.  Particularly suitable dicarboxylic acids are adipic, azelaic and sebacic acids. The dicarboxylic acid may be esterified with a C1-C40 saturated or unsaturated alcohol which may be an ether alcohol or thio-ether alcohol. Suitable alcohols are 2-ethyl hexanol, octyl alcohol and C5-C12 oxo alcohols.  Examples of polymers which may be used are polychloroprene, polyvinyl chloride, polyvinylidene chloride, polyvinyl chloride-acetate copolymers, polychlorotrifluoro - ethylene, polymono- and di-chlorostyrenes and poly-2,3-dichlorobutadiene.  The composition may also contain mono-esters, polyesters, complex esters, glycols, polyglycols, formals, polyformals, complex formals or blends of such compounds and various types of these synthetic lubricating oils are described. Anti-oxidants such as substituted phenols (e.g. catechol), aromatic nitro-compounds, aromatic amines including amine sulphides such as phenothiazine, sulphur-containing cyclic compounds (e.g. thiophene), thioalcohols, or their substituted derivatives, and phosphorus- and sulphur-containing organic compounds (e.g. thiophosphates) may be added to the composition. In the examples, compositions are described consisting of (a) di-iso-octyl adipate or sebacate and polyvinyl chloride, or (b) di-iso-octyl sebacate and polychloroprene, with or without a complex ester derived from polyethylene glycol of molecular weight 400, sebacic acid and 2-ethyl hexanol.  The Provisional Specification refers generally to compositions comprising a synthetic lubricating oil having dissolved therein a small amount of one or more halogen- and/or sulphur-containing polymers. Specifications 653,950, 664,052, [Group IV (b)], 668,663, 687,346, [Group III], 699,440, 708,035, [both in Group IV (b)], 708,202, [Group XXVIII], 732,086, 743,571 and 756,427, [Group III], are referred to.ALSO:Lubricating compsitions, having the loadcarrying ability and viscosity-temperature characteristics rendering them suitable for use in aviation gas turbine systems, comprise a diester of a C2-C40 dicarboxylic acid having dissolved therein 0.01-10 per cent by weight, based on the total composition, of one or more halogen- and/or sulphur-containing hydrocarbon polymers or copolymers thereof. The dicarboxylic acid may be a straight- or branched-chain saturated or unsaturated acid and may contain at least one ether or thio-ether linkage.  Particularly suitable dicarboxylic acids are adipic, azelaic and sebacic acids.  The dicarboxylic acid may be esterified with a C1C40 saturated or unsaturated alcohol which may be an ether alcohol or thio-ether alcohol.  Suitable alcohols are 2 - ethyl hexanol, octyl alcohol and C5-C12 oxo alcohols.  Examples of polymers which may be used are polychloroprene, polyvinyl chloride, polyvinylidene chloride polyvinyl chloride-acetate copolymers, polychlorotrifluoroethylene, polyalkylene sulphides, polymono- and di-chlorostyrene and poly- 2, 3 - dichlorobutadiene. The lubricating compositions may also contain mono-esters, polyesters, complex esters, glycols, polyglycols, formals, polyformals, complex formals or blends of such compounds, and various types of these synthetic lubricating oils are described. Antioxidants such as substituted phenols (e.g. catechol), aromatic nitro compounds, aromatic amines including amine sulphides such as phenothiazine, sulphur-containing cyclic compounds (e.g. thiophene), thioalcohols, or their substituted dervatives, phosphorus- and sulphur-containing organic compounds (e.g. thiophosphates), and the anti-oxidants described in Specification 743,571, may be added to the lubricating compositions. In the examples, lubricating compositions are described consisting of (a) di-iso-octyl adipate or sebacate and polyvinyl chloride or (b) di-iso-octyl sebacate and polychloroprene with or without a complex ester derived from polyethylene glycol of molecular weight 400, sebacic acid and 2 - ethyl hexanol.  For comparison purposes, lubricating compositions are described consisting of di-iso-octyl sebacate and the above-mentioned complex esters, with or without tricresylphosphate.  The Provisional Specification refers generally to lubricating compositions comprising a synthetic lubricating oil having dissolved therein a small amount of one or more halogen- and/or sulphur-containing polymers.  Specifications 653,950, 664,052, 668,663, 687,346, 699,440, 708,035 [Group IV(b)], 708,202 [Group XXVIII], 732,086 and 756,427 also are referred to.