Patent GB-365084-A (GB)
Title: Improvements in driers for oils, paints and varnishes
IPC: C09F9/00
Filed: 1930-09-09
Abstract: Driers for oil such as linseed or tung oil or for paints or varnishes containing these oils or for resinous products derived from the oils or the corresponding fatty acids such as the products made by condensing glycerol, phthalic anhydride, and drying oils or their acids, consist of polyvalent metal salts of a benzoic acid in which at least one nuclear hydrogen atom is replaced by a hydrocarbon radicle.  Salts of cobalt, lead, manganese, iron, vanadium, cadmium, tin, nickel, chromium, copper, zinc, and aluminium may be used. Numerous examples of suitable acids are given.  The salts are made by double decomposition between the sodium or potassium salts of the organic acids and soluble salts of the metals, or by fusion of the free acid with the oxide, hydroxide, or carbonate of the metal.  The salts may be dissolved directly in oils, or dissolved in an aromatic hydrocarbon, which is then mixed with the oil.ALSO:Driers for oils such as linseed or tung oil or for paints or varnishes containing these oils or for resinous products derived from the oils or the corresponding fatty acids such as the products made by condensing glycerol, phthalic anhydride and drying oils or drying oil acids, consist of polyvalent metal salts of a benzoic acid in which at least one nuclear hydrogen atom is replaced by a hydrocarbon radicle. Salts of cobalt, lead, manganese, iron vanadium, cadmium, tin, nickel, chromium, copper, zinc and aluminium may be used.  Suitable acids are toluic acids, propyl or isopropyl benzoic acids, o-, m- or p-butyl or phenyl benzoic acids, mesitylenic acid, and a - or b -naphthoic acids, or derivatives of these acids in which the hydrogen in the substitution group is replaced by an alkyl or aryl group, as in para-xylyl-orthobenzoic acid and naphthyl methane-ortho-benzoic acid.  Orthoderivatives of benzoic acid may be obtained by condensing phthalic anhydride with a compound having a replaceable hydrogen, hydrolysing the product and then reducing the resultant keto-acid R,CO,C6H4,COOH in which R may be (1) an alkyl group, such as methyl, ethyl, butyl, propyl, isopropyl, amyl; (2) a benzene ring or its derivative, such as toluene, ethyl, propyl, isopropyl, dimethyl, butyl or amyl benzene, cymene, chlorbenzene, dichlorbenzene, cyclohexane, methylcyclohexane, hexaethylbenzene and cyclohexene; (3) a polynuclear aromatic group or its derivative such as naphthalene, chlornaphthalene, methyl, ethyl, and isopropylnaphthalene, tetra- and decahydronaphthalene, anthracene, diphenyl, phenanthrene, dinaphthyl, retene, perylene; (4) a mixed system such as diphenyl oxide, diphenylene oxide, carbazole, anisole, phenetole, dibenzyl ether, diphenyl methane, dinaphthyl ether, dibenzyl, ditolyl, dinaphthylene oxide, acenaphthene, fluorene, chrysene, hydrindene, picene, stilbene, pinene, dipentene.  The benzoic acid nucleus may also be alkylated, nitrated, halogenated, or hydrogenated.  The ketone group may be reduced by zinc dust and ammonia ; if hydrogen in the presence of platinum is used, completely saturated compounds are obtained, a -naphthoyl-o-benzoic acid yielding perhydro - a -naphthyl - methane-o - benzoic acid.  The polyvalent metal salts are prepared from the sodium or potassium salts of the acids by double decomposition with soluble salts of the metals, or by fusion of the metal oxide, hydroxide, or carbonate with the free acid.  The salts may be dissolved directly in oils, or first in aromatic hydrocarbons, which are then mixed with the oils.