Patent GB-772144-A (GB)
Title: Improvements relating to aluminium alcoholate derivatives
IPC: C07F5/06
Filed: 1954-11-15
Abstract: Resinous condensation products are obtained by heating an aluminium alcoholate of a normal or isomonohydroxy alcohol containing from 3 to 10 carbon atoms with a monoalkylene glycol having at least 6 carbon atoms or a polyalkylene glycol having 3 or 4 carbon atoms in the alkylene radical, the number of alkylene radicals being from 2 to 10, and the glycol having more carbon atoms than the alcohol from which the alcoholate is derived.  If desired, the alcoholate used as starting material may have one or two of the alcoholate groups replaced by radicals of a compound exhibiting keto-enol tautomerisms, e.g. ethyl acetoacetates or the product may be further reacted with an alcohol having more than 8 carbon atoms.  In the examples: (a) aluminium isopropoxide dissolved in white spirit is reacted with octylene glycol; the white spirit is distilled off and the dry resin product is heated with stearyl alcohol; (b) aluminium butylate is heated with hexylene glycol to give a resin which is mixed with oleyl alcohol to give a soft wax; (c) dipropylene glycol is heated with aluminium isopropylate to give a resinous mass which is soluble in benzine; (d) aluminium isopropylate is heated with ethyl acetoacetate and the product is heated with dipropylene glycol to give a product which acts as a drier for alkyds.  The aluminium alcoholate derivatives may be used for thickening or gelling alkyd resins and other hydroxyl-containing oils and resins, e.g. they may be added to a soya bean oil-modified glyceryl alkyd resin of 30 per cent phthalic anhydride content or to linseed oil.  They may also be used as cross-linking agent for the production of rubbery products from polyesters of molecular weight 10,000-100,000 derived from polypropylene glycol and dicarboxylic acids.  The addition of one of the aluminium alcoholate derivatives to a mixture of ethylene or propylene glycol and adipic acid produces high-molecular polymers of rubber-like properties.  The aluminium alcoholate derivatives may also be used in admixture with fatty amide and polyamide resins, particularly with polyamide resins made from dimerised fatty acids, e.g. linoleic acid, ethylene diamine and diethylene triamine.ALSO:The invention comprises condensation products of aluminium alcoholates of normal or isomonohydroxy alcohols containing from 3 to 10 carbon atoms with polyalkylene glycols having 2-10 alkylene radicals each containing 3 or 4 carbon atoms, the glycol containing more carbon atoms than the alkoxy group of the alcoholate used.  These and other aluminium alcoholate derivatives are obtained by heating an aluminium alcoholate of a normal or iso-monohydroxy alcohol containing 3-10 carbon atoms with a monoalkylene glycol having at least 6 carbon atoms or a polyalkylene glycol having 2-10 radicals each containing 3 or 4 carbon atoms, the glycol having more carbon atoms than an alkoxy group of the alcoholate used as starting material.  If desired, the aluminium alcoholates used as starting materials may contain one or two radicals of compounds exhibiting keto-enol tautomerism, e.g. a radical of an enolic keto ester, such as ethyl laevulinate or ethyl acetoacetate, or of a keto alcohol or diketone such as acetonyl acetone, pentane dione and diacetone alcohol.  These may be obtained by heating the aluminium tri-alcoholate with sufficient of the keto-compound to replace one or two of the alkyl radicals.  In the examples: (a) aluminium isopropoxide is heated with octylene glycol; (b) aluminium butylate is heated with hexylene glycol; (c) dipropylene glycol is heated with aluminium isopropylate; (d) hexapropylene glycol is heated with aluminium isobutylate; (e) dibutylene glycol is heated with aluminium propylate; (f) aluminium isopropylate is heated with ethylacetoacetate and the product is heated with dipropylene glycol.ALSO:Aluminium alcoholate derivatives suitable for use in coating compositions are obtained by heating an aluminium alcoholate of a normal or iso-monohydroxy alcohol containing from 3 to 10 carbon atoms with a monoalkylic glycol having at least 6 carbon atoms or a polyalkylene glycol having 2-10 radicals each containing 3 or 4 carbon atoms, the glycol having more carbon atoms than an alkoxy group of the alcoholate used as starting material.  If desired the aluminium alcoholate used as starting material may have one or two alkoxy groups replaced by one or two radicals of a compound exhibiting ketoenol tantomerism, preferably of an enolic keto ester such as ethylacetoacetate.  When 3 per cent of one of these aluminium alcoholate derivatives is added to linseed oil, coating compositions containing it have improved drying characteristics. When 1 per cent of one of the aluminium alcoholate derivatives is added to a soya bean oil modified glyceryl alkyd resin of 30 per cent phthalic anhydride content, a thickened product is obtained suitable for use as a coating composition.  The aluminium alcoholate derivatives may also be mixed with fatty amide and polyamide resins to give a coating which dries hard and tack-free. In an example, the dipropylene glycol-aluminium isopropylate reaction product is dissolved in a mixture of butanol and xylol and heated with the resinous condensation product of dimer linoleic acid with diethylene triamine to give a resin solution which when applied as a coating dries rapidly by the absorption of moisture from the air to provide a hard tack-free surface.