Basic metal salts having improved color and stability and vinyl halide polymers containing same
AssigneeThe Lubrizol Corporation
InventorRobert E. Quinn
Life of this patent
Estimating the term…
Abstract
In accordance with the present invention, it has been found that the color and stability of basic alkali and alkaline earth metal salts prepared from mixtures containing a phenol can be improved by conducting the reaction in the absence of free oxygen and thereafter post-treating the reaction product with at least one compound capable of displacing the hydrogen of the phenolic hydroxyl groups present in the mixture while maintaining oxygen free atmosphere. Generally, the metal salts will be alkaline earth metal salts of phenols such as calcium and barium salts. A preferred example of the compound capable of displacing the hydrogen of the phenolic hydroxyl group is an epoxide such as ethylene oxide and propylene oxide.
Claims38
A process for improving the color and stability of basic alkali and alkaline earth metal salts groups present in the mixture in the absence of free oxygen wherein the compound (C) is selected from the group consisting of phosgene, diazomethane, metal sulfoxides, isocyanates and ether forming compounds.
A process for improving the color and stability of basic alkali or alkaline earth metal salts prepared from mixtures containing a phenol which comprises the steps of
- (A) preparing, in the absence of free oxygen, a mixture of
- (A-2-1) at least one alkali or alkaline earth metal base,
- (A-2-2) at least one phenol,
- (A-2-3) at least one aliphatic or alkyl aromatic monocarboxylic acid, and
- (A-2-4) optionally at least one aliphatic alcohol, the ratio of equivalents of (A-2-3) to (A-2-2) being at least about 1.1:1, and the ratio of the equivalents of the metal base to the combination of the other components being greater than 1:1,
- (B) heating said mixture in the absence of free oxygen to drive off at least some of the water which may be present,
- (C) treating said mixture with carbon dioxide in the absence of free oxygen until the titratable basicity (phenolphthalein indicator) of the mixture has been substantially reduced, and
- (D) treating the mixture with at least one compound capable of displacing the hydrogen of the phenolic hydroxy groups present in the mixture in the absence of free oxygen wherein the compound (C) is selected from the group consisting of phosgene, diazomethane, metal sulfoxides, isocyanates and ether forming compounds.
Dependencies are inferred from the claim text.