Abstract: Lubricating oil composition comprising a major proportion of a mineral lubricating oil and, as viscosity index improver, a hydrogenated block copolymer or olefin copolymer functionalized by the presence of carboxyl groups attached to the polymer chain by a sulphonamide linkage.

Abstract: Lubricating oil composition comprising a lubricating base oil, one or more overbased alkaline earth metal salts of an aromatic carboxylic acid, and a stabilizing agent which has been selected from a polyalkoxylated alcohol having a molecular weight from 150 to 1500.

Abstract: Barium sulfate scale can be removed from remote locations such as those in or around the borehole of a well extending into a subterranean earth formation by contacting the scale with an aqueous solution consisting essentially of water, a monovalent cation salt of a macrocyclic polyether containing at least two nitrogen-linked phosphomethyl groups and enough monovalent basic compound to provide a solution pH of about 8.

Abstract: A novel complex of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) and dimethylcarbonate or dimethyloxalate, containing one molecule of dimethylcarbonate or dimethyloxalate for each molecule of 18-crown-6, is useful in isolating 18-crown-6 from mixtures containing it. In the isolation or purification process described, 18-crown-6 is isolated from a mixture containing it by reacting the 18-crown-6 with dimethylcarbonate or dimethyloxalate to form a complex substantially in the form of a dispersed solid in a solution containing the non-complexed material of the mixture, separating the dispersed complex from the solution and disassociating the dimethylcarbonate or dimethyloxalate from the separated complex.