US5196388A
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Process for the preparation of double metal oxide powders containing a Group IIIA and a Group IVB element and a novel double metal hydroxyl carboxylate useful in preparing same
Assignee: Akzo NV
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Filing: 1991-06-10
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Granted: 1993-03-23
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Expires: 2011-06-10
Abstract
Abstract Disclosed is a process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA, inclusive of aluminum and gallium, and at least one metal of Group IVB, inclusive of titanium and zirconium. The process involves a first step in which an aqueous solution of mixed metal alkoxides or salts is formed and which also contains a chelating agent, preferably a polycarboxylic acid, and a second step in which a base is added in order to cause precipitation of a mixed metal hydroxyl groups-containing precursor that can be calcined or otherwise converted to the final mixed metal oxide. The invention also pertains to novel double metal hydroxyl carboxylates which are useful intermediates in preparing double metal oxides.
Inventors
- 👤 Lieh-Jiun Shyu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/478; C01; C01B; C01B13/00; C01B13/14; C01B13/36; C01B13/363; C01G; C01G23/00; C01G23/003; C04B35/622; C04B35/626
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
120 words
A process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA and at least one metal of Group IVB comprising the steps of: (a) forming an aqueous solution of mixed metal compounds which respectively contain said Group IIIA and Group IVB metals and which compounds are selected from the group consisting of the metal salts, the metal alkoxides, and the mixtures thereof, the solution also containing a polyfunctional compound capable of chelating the metal compounds; (b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate; and, (c) converting the precipitate formed under (b) into a double metal oxide.
Claim 2
Dependent Claim
120 words
A process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA and at least one metal of Group IVB comprising the steps of: (a) forming an aqueous solution of mixed metal compounds which respectively contain said Group IIIA and Group IVB metals and which compounds are selected from the group consisting of the metal salts, the metal alkoxides, and the mixtures thereof, the solution also containing a polyfunctional compound capable of chelating the metal compounds; (b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate; and, (c) converting the precipitate formed under (b) into a double metal oxide.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the polyfunctional compound capable of chelating said metal compounds is a polycarboxylic compound.
Claim 4
Dependent Claim
14 words
A process according to claim 2, wherein the polycarboxylic compound is a polycarboxylic acid.
Claim 5
Dependent Claim
14 words
A process according to claim 3, wherein the polycarboxylic acid is a dicarboxylic acid.
Claim 6
Dependent Claim
38 words
A process according to claim 4, wherein the dicarboxylic acid is selected from the group consisting of oxalic acid, malonic acid, adipic acid, malic acid, maleic acid, succinic acid, itaconic acid, citraconic acid, glutaric acid, and mixtures thereof.
Claim 7
Dependent Claim
20 words
A process according to claim 1, wherein the Group IIIA metal is aluminum and the Group IVB metal is titanium.
Claim 8
Dependent Claim
19 words
A process according to claim 6, wherein the polyfunctional compound capable of chelating said metal compounds is oxalic acid.
Claim 9
Dependent Claim
28 words
A process according to claim 7, wherein aluminum is used in the form of an inorganic acid salt and titanium is used in the form of an alkoxide.
Claim 10
Dependent Claim
29 words
A process according to claim 1, wherein the base is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide, magnesium hydroxide, calcium hydroxide, and mixtures thereof.
Claim 11
Dependent Claim
29 words
A process according to claim 3, wherein the base is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide, magnesium hydroxide, calcium hydroxide, and mixtures thereof.
Claim 12
Dependent Claim
12 words
A process according to claim 8, wherein the base is ammonium hydroxide.
Claim 13
Dependent Claim
89 words
A hydroxyl groups-containing double metal compound obtainable by a process involving the steps (a) and (b) as described in claim 1, in accordance with the general molecular formula (A).sub.x (B).sub.y (OH).sub.p (FG).sub.q in which A represents a Group IIIA metal; B represents a Group IVB metal; FG represents a functional group that is part of the chelating agent; x,y,p, and q each independently represent an integer greater than 1 with the proviso that x:y is in the range of from about 1 to about 25, and p+q equals 6x+4y.
Claim 14
Dependent Claim
43 words
A double metal compound in accordance with the general structural formula ##STR3## in which A represents a Group IIIA metal; B represents a Group IVB metal; n represents an integer greater than 1 R represents an organic radical r is 0 or 1.
Claim 15
Dependent Claim
43 words
A double metal compound in accordance with the general structural formula ##STR3## in which A represents a Group IIIA metal; B represents a Group IVB metal; n represents an integer greater than 1 R represents an organic radical r is 0 or 1.
Claim 16
Dependent Claim
33 words
A double metal compound according to claim 13, wherein the organic radical is of the general formula --(CH 2 ) y -- in which y represents an integer of from 0 to 6.
Claim 17
Dependent Claim
22 words
A double metal compound according to claim 12, wherein the Group IIIA metal is aluminum and the Group IVB metal is titanium.
Claim 18
Dependent Claim
1 words
Aluminum-titanium-hydroxyl-oxalate.
Claim 19
Dependent Claim
1 words
Aluminum-titanium-hydroxyl-oxalate.
Claim 20
Dependent Claim
106 words
A process for the preparation of a double metal hydroxyl carboxylate containing at least one metal of Group IIIA, inclusive of aluminum and gallium, and at least one metal of Group IVB, inclusive of titanium and zirconium, comprising the steps of (a) forming a mixed aqueous solution of compounds which contain said metals and which are selected from the group consisting of metal salts, metal alkoxides, and mixtures thereof, the solution also containing a polycarboxylic compound capable of chelating the metal compounds; and, (b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate.
Claim 21
Dependent Claim
106 words
A process for the preparation of a double metal hydroxyl carboxylate containing at least one metal of Group IIIA, inclusive of aluminum and gallium, and at least one metal of Group IVB, inclusive of titanium and zirconium, comprising the steps of (a) forming a mixed aqueous solution of compounds which contain said metals and which are selected from the group consisting of metal salts, metal alkoxides, and mixtures thereof, the solution also containing a polycarboxylic compound capable of chelating the metal compounds; and, (b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate.
Claim 22
Dependent Claim
35 words
A method of using a double metal compound obtainable by a process in accordance with claim 17 to prepare a double metal oxide,.comprising the step of subjecting said compound to sufficient heat to effect decomposition.
Claim 23
Dependent Claim
31 words
A method of using a double metal compound according to claim 12 to prepare a double metal oxide, comprising the step of subjecting said compound to sufficient heat to effect decomposition.
Claim 24
Independent Claim
37 words
A method of using aluminum-titanium-hydroxyl oxalate to prepare aluminum titanate, comprising the step of heating the hydroxyl oxalate to a temperature of from 1000° C. to 1500° C. for a sufficient period of time to effect decomposition.
Claim 25
Independent Claim
37 words
A method of using aluminum-titanium-hydroxyl oxalate to prepare aluminum titanate, comprising the step of heating the hydroxyl oxalate to a temperature of from 1000° C. to 1500° C. for a sufficient period of time to effect decomposition.
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| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
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