Patent GB-721749-A (GB)
Title: Improvements in or relating to complex basic ferric carboxylates and methods of making the same
IPC: C09C1/24
Filed: 1951-06-11
Abstract: Complex basic ferric carboxylates in which hydroxyl groups of ferric hydroxide are substituted at least in part and to an extent not exceeding one hydroxyl group per three atoms of iron by a fatty acid radical of a fatty acid having at least four carbon atoms, chlorinated oleic acid, fatty acids of chlorinated cottonseed oil or a naphthenic acid (see Group IV (b)) are pigments which may be employed in organic coating compositions and printing inks, e.g. in vehicles of the nitrocellulose, alkyd or oleoresinous types.  A gold lacquer is described which comprises a pigment, obtained by reacting ferric hydroxide with coconut fatty acids, nitrocellulose, coconut oil modified alkyd resin, castor oil modified alkyd resin, toluol, xylol, butyl acetate and butyl alcohol.ALSO:High molecular weight complex iron compounds are prepared by a process which comprises reacting ferric hydroxide with a compound having the formula R1OR2, in which R1 is NH4 or H and OR2 is an acid radical of a fatty acid having at least four carbon atoms, chlorinated oleic acid, fatty acids of chlorinated cottonseed oil, 8,9-dichlorostearic acid or a naphthenic acid, in a reaction medium comprising a non-reactive compound containing both an organohydrophobic and a hydrophilic group which is liquid at 102 DEG  C. and condensable at that temperature by a water-cooled condenser, and separating the iron compound formed from the reaction medium, the molar ratio of ferric hydroxide to the compound of formula R1OR2 being at least 3 : 1.  The invention comprises complex basic ferric carboxylates in which hydroxyl groups of ferric hydroxide are substiturtd at least in part and to an extent not exceeding one hydroxyl group per three atoms of iron by an acid radical of a fatty acid having at least four carbon atoms or a naphthenic acid. Fatty acid starting materials mentioned include stearic, palmitic, lauric and ethyl hexoic acids and their ammonium soaps, commercial mixtures of fatty acids, e.g. coconut fatty acids and castor oil fatty acids, and ricinoleic acid.  Naphthenic acids mentioned include the aliphatic monocyclic acids containing up to six carbon atoms, monocyclic acids containing seven to twelve carbon atoms and dicyclic acids having more than twelve carbon atoms. Compounds containing an organohydrophobic group and an hydrophilic group mentioned include isobutyl, 2-ethyl-hexyl and hexyl alcohols, octyl acetate and hexaethyl tetraphosphate, amyl methyl ketone, the ethyl, butyl di-ether of glycol, diamyl- and triethyl-amines.  In examples: Ammonia solution in excess of that required to precipitate ferric hydroxide and form the ammonium salt of the fatty acid, is added to aqueous ferric chloride solution cooled with ice, followed by coconut fatty acids, isobutanol and ethyl hexanol, the mixture is boiled under reflux and the pigment which forms is separated, dried and pulverized (1); palmitic acid is employed in a similar process (2); ammonia solution is added to a mixture of aqueous ferric chloride cooled with ice, coconut fatty acids, isobutanol and ethyl hexanol and the mixture is refluxed, and the pigment is separated (3); in similar processes ethyl hexoic acid (5); castor oil fatty acids (6); a naphthenic acid (7) are employed whilst n-octanol and iso butanol are used with stearic acid (4); caprylic acid (8); and 8,9-dichlorostearic acid (9) in similar processes.  To show that not more than one mol. of acid or the ammonium salt thereof will react with three mols. of ferric hydroxide processes similar to (1) are carried out using butyric, ethyl butyric, caproic, caprylic, capric, lauric, myristic and palmitic acids, the product in each case being dissolved in toluene and precipitated with ethyl acetate.  The product may be incorporated in organic coating compositions and printing inks, e.g. in vehicles of the nitrocellulose, alkyd or oleoresinous types (see Group IV (a)).ALSO:Complex basic ferric carboxylates in which hydroxyl groups of ferric hydroxide are substituted at least in part and to an extent not exceeding one hydroxyl group per three atoms of iron by an acid radical of a fatty acid having at least four carbon atoms, chlorinated oleic acid, fatty acids of chlorinated cotton seed oil, 8, 9-dichlorostearic acid or a naphthenic acid (see Group IV (b)) are pigments which may be used in alkyd, nitrocellulose and oleoresinous types of vehicles (see Group IV (a)).  Acids mentioned which may be reacted with ferric hydroxide to produce the pigments include butyric, caproic, myristic, palmitic, coconut and castor oil acids.