Lubricating oil compositions
AssigneeExxon Research & Engineering Co.
InventorsVictor Charles Ernest Burnop, Ronald Charles Watkins
Life of this patent
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Abstract
A lubricating oil composition comprising a lubricating oil base and (A) an overbased detergent additive (e.g. an organic phenate) is foam stabilised by adding thereto, (B) 0.1 to 15 wt.% based on the weight of (A) of a monocarboxylic acid, anhydride or salt thereof, or a dicarboxylic acid, anhydride or salt thereof, said acid, anhydride (e.g. a polyisobutenyl succinic anhydride) or salt having at least 30 carbon atoms per molecule or the reaction product of a phosphorus sulphide with a hydrocarbon and (C) a dihydric alcohol having 2,3, or 4 carbon atoms per molecule (e.g. ethylene glycol), or a di- or tri- (C.sub.2 -C.sub.4) glycol or an ether alcohol having 2 to 10 carbon atoms per molecule.
Claims17
A foam stabilised lubricating oil composition comprising a lubricating oil base, from 0.01 to 20 wt.% of (A) an overbased detergent additive, (B) 0.1 to 15 wt.% based on the weight of (A) of an aliphatic monocarboxylic acid, anhydride or salt thereof, or an aliphatic dicarboxylic acid, anhydride or salt thereof, said acid, anhydride or salt having at least 30 carbon atoms per molecule or the reaction product of a phosphorus sulphide with a hydrocarbon and (C) a dihydric alcohol having 2,3 or 4 carbon atoms per molecule, or a di- or tri- (C.sub.2 -C.sub.4) glycol or an ether alcohol having 2 to 10 carbon atoms per molecule.
Dependencies are inferred from the claim text.