Patent GB-513222-A (GB)
Title: Manufacture of driers
IPC: C09F9/00
Filed: 1938-04-01
Abstract: 513,222. Driers; metal carboxylates ; carboxylic acids. I,. G. FABBENINDUSTRIE AKT.-GES. April 1, 1938, No. 10006. Convention date, April 1, 1937. [Classes 1 (iii) and 95] [Also in Group IV] Driers comprise the simple or complex salts of polyvalent heavy metals or earth metals with mixtures of carboxylic acids containing 6-16 carbon atoms and branched carbon chains, or fractions of these mixtures, obtained from primary aliphatic alcohols by means of an alkaline oxidation at a raised temperature and it may be under pressure. The carboxylic acid mixture may be derived from the mixed alcohols comprising the fraction boiling above 140‹C. of the so-called " isolutyl oil " obtained as by-product during the synthesis of methanol by the hydrognation of carbon monoxide under pressure. The driers may be prepared from the free acids or their alkali metal salts and the requisite metal salts, hydroxides, or oxides by the known '' precipitating," " melting," " direct dissolving," or " combined dissolving " processes. The crude sodium salts of the acids formed during the oxidation in the presence of sodium hydroxide may sometimes be used, after neutralization of free alkali as by means of napthenic acid, resinic acid, wool fat acid, or linoleic acid. Compounds of the metals cobalt, manganese, lead, zinc, aluminium, copper, iron, mercury, bismuth, cadmium, chromium, cerium, or vanadium may be used, and when a complex metal salt is to be formed, an alkaline-earth metal compound may, if desired, be included. The driers obtained may be mixed with other driers such as linoleates, resinates, or naphthenates, or the acids of such driers may be added to the carboxylic acid mixtures specified before their conversion into metal salts. When the precipitation process is used, the precipitated drier may have added thereto a drying oil, semi-drying oil, or a non- drying oil or the acids thereof, or softening agents such as liquid trialkyl phosphates, dialkyl phthalates, benzyl benzoates, or butylstearates to accelerate the final melting step, which may be effected under reduced pressure with the addition of small quantities of readily volatile organic solvents such as benzene, toluene, xylene. or butanol. This step may be carried out with exclusion of air to obtain a light-coloured product. The driers are readily soluble in drying and semi-drying oils such as linseed oil, wool oil, perilla oil, soya bean oil or the acids thereof, and in organic solvents such as mineral spirit, turpentine oil, benzene, toluene, xylene, solvent naphtha, tetrahydronaphthalene, methylene chloride, carbon tetrachloride, and cyclohexane, and from very stable solutions. By adding to the solid drier or a solution thereof a small quantity of a free carboxylic acid such as crotonic or benzoic acid, or an amino-compound such as triethanolamine, or ethylenediamine, or an alcohol of high molecular weight, the stability of the solutions is still further improved. Numerous illustrative examples are given, in which the mixed carboxylic acids or fractions thereof used are usually derived from by-products obtained in the synthesis of methanol, but in one case are derived from the oily products obtained during the catalytic condensation of aliphatic alcohols in the presence or absence of carbon monoxide ; in this case the alkaline oxidation to form the acid mixture is preferably carried out in the presence of a substance insoluble in alcohol and adapted to split off hydrogen, such as an oxide of silver, copper, nickel, manganese, or zinc. The Specification as open to inspection under Sect. 91 comprises also the use of single carboxylic acids having 6-16 carbonations and branched carbon chains for perforation of the driers. This subject-matter does not -appear in the Specification as accepted.