Patent ID: 6517795
Filing Date: 2003-02-11
Classification: A61K,A61P,A61Q,B01J,C01B,C01F,C01G,C01P,C08K

Abstract:
A process for producing high purity hydrotalcites which are stratiform, anionic mixed metal hydroxides of the general formulaM2x2+ M23+(OH)4x+4.A2/nnâˆ’.zH2O wherein M2x2+, M23+ are divalent and trivalent metal(s) respectively, x ranges from 0.5 to 10 in intervals of 0.5, A is an interstitial anion selected from the group consisting of a hydroxide anion and an organic anion, n is the charge of said interstitial anion, and z is an integer of 1 to 6, comprising(A) mixing at least one divalent metal alcoholate with at least one trivalent metal alcoholate, both metal alcoholates being metal alcoholates of mono-, di-, or trihydric C1 to C40 alcoholates, where said mono-, di- and trihydric metal alcoholates being mixed in a molar ratio corresponding to the stoichiometry of the formula referred to hereinabove, and (B) hydrolyzing the resultant alcoholate mixture with water, the water for hydrolysis being used in stoichiometric excess, referring to the reactive valences of the metals used and where the source of the interstitial anions for A is from the water-soluble anions contained in the water for hydrolysis.