GB806113A - Improvements relating to aluminium alcoholate derivatives - Google Patents

Abstract

The invention comprises condensed organic aluminium compounds of general formulae <FORM:0806113/IV (a)/1> and (b) <FORM:0806113/IV (a)/2> in which R1 is an alkyl or aryl radical and X is the radical of a monocarboxylic acid HX. They are prepared from acyloxyaluminium alcoholates or phenolates, which are obtained by heating one mol. of aluminium alcoholate or phenolate with up to 2.4 mols. of monocarboxylic acid, by heating the acyloxy aluminium compounds to a temperature higher than that used in their preparation. The condensation products may be further reacted with alcoholic or phenolic hydroxy compounds, water or carboxylic acids. The compound of formula (a) above on heating to a temperature above 230 DEG C. gives (O=Al.OR1)n in which n has an integral value and the compound of formula (b) on further heating, e.g. to 200 DEG -300 DEG C. gives (O=AIX)n. The monocarboxylic acids used are for example fatty acids such as stearic, oleic and linoleic acids; cycloaliphatic acids such as the naphthenic acids; aromatic acids such as benzoic acid; and acid mixtures such as tall oil. The aluminium alkoxide used as starting material may be a mixed alkoxide-phenoxide.ALSO:The invention comprises condensed organic aluminium compounds of the general formulae <FORM:0806113/IV (b)/1> and <FORM:0806113/IV (b)/2> in which R1 is an alkyl or aryl radical and X is the radical of a monocarboxylic acid HX. They may be prepared from acyloxy aluminium alcoholates or phenolates, which are obtained by heating and reacting one mol. of aluminium alcoholate or phenolate with up to 2.4 mols. of monocarboxylic acid, by heating the acyloxy aluminium compounds to a temperature higher than that used for their preparation and condensing them to form partially or completely condensed aluminium compounds with liberation of ester. The condensation products may be further reacted with alcoholic or phenolic hydroxy compounds, water or carboxylic acids to give useful products. Where 1 and 2 mols. of acid/mol. of aluminium alcoholate are used the intermediate products are believed to have the formula (1) <FORM:0806113/IV (b)/3> and (2) <FORM:0806113/IV (b)/4> respectively, R1OH and R2OH representing the alcohols used in the preparation of the alcoholate and HX being the acid used. The compound of formula (1) on further heating to a temperature in the range 150-230 DEG C. gives <FORM:0806113/IV (b)/5> and this on heating to a temperature above 230 DEG C. gives (O = Al-OR1)n where n has an integral value. On heating the compound of formula (2) up to 160 DEG C. the compound <FORM:0806113/IV (b)/6> is obtained and on heating this to higher temperatures the compound (O = Al.X)n is obtained. The monocarboxylic acids used are, for example, fatty acids such as stearic, oleic and linoleic acids; cycloaliphatic acids such as the naphthenic acids; aromatic acids such as benzoic acid; and acid mixtures such as tall oil. The aluminium alkoxide used as starting material may be a mixed alkoxide-phenoxide. The alcohols used in the formation of the alkoxides may be primary, secondary or tertiary and may be normal or otherwise. In the examples: (a) aluminium isopropoxide is mixed with an equimolar amount of stearic acid and the mixture is heated to 90 DEG C. to give aluminium di-isopropoxide monostearate; the temperature is raised to 185 DEG C. to give a liquid mixture containing a compound of formula (3) in which X is a stearate radical and R1 is an isopropyl radical; (b) the mixture obtained in (a) is heated to 230 DEG C. to give a solid of formula (3) in which X is a stearate radical and R1 is an isopropyl radical; (c) aluminium isopropoxide is heated with stearic acid and acetic acid to 70 DEG C. and the product is heated to 260 DEG C. to give a condensed aluminium product; (d) aluminium isopropoxide is heated with an equimolar amount of acetic acid to give aluminium monoacetate di-isopropoxide which is heated to 200 DEG C. when an equimolar amount of isopropyl acetate distils off: on heating to 250 DEG C. a compound corresponding to the formula (O = Al-OPr)n is obtained; and (e) aluminium isopropoxide is heated with octoic acid to 100 DEG C. with loss of isopropanol; the temperature is raised to 150 DEG and then to 210 DEG C. with further loss of isopropanol to give a condensed aluminium - containing product; further heating to 325 DEG C. brings about further condensation to give isopropyl octoate and a condensed aluminium-containing product.