US4609694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing metamorphosed alkaline titanates
Assignee: Otsuka Chemical Co Ltd
•
Filing: 1984-11-19
•
Granted: 1986-09-02
•
Expires: 2004-11-19
Abstract
Abstract A process for preparing metamorphosed alkaline metal titanates which comprises heating a mixture of at least one alkaline metal compound capable of being decomposed into an oxide of the alkaline metal and a gas by heating, and titanium dioxide, under a non-oxidative atmosphere, in the presence of at least one carbide represented by the formula C(M).sub.z (1) wherein M is an element except carbon selected from groups III, IV and V in Periodic Table, and z is an integer corresponding to valency of M. The products have excellent heat resistance and electroconductivity and are useful as insulating materials.
Inventors
- 👤 Takuo Morimoto
- 👤 Kihachiro Nishiuchi
- 👤 Kenichi Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:31
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/003; C01G23/005; C09; C09C; C09C1/00; C09C1/36; C01P; C01P2002/00; C01P2002/02; C01P2006/00; C01P2006/40; C01P2006/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A method of preparing electroconductive, heat resistant alkali metal titanates which comprises heating, under a non-oxidative, non-hydrogenous atmosphere, a mixture consisting essentially of at least one alkali metal compound capable of being decomposed by heating into an oxide of the alkali metal and a gas, and titanium dioxide, in the presence of at least one carbide of an element selected from Group IV of the Periodic Table, said titanium dioxide and said alkali metal compound being present in the mixture in such proportions that the ratio of the number of titanium atoms to the number of alkali metal atoms is in the range of 1:1 to 1:10.
Claim 2
Independent Claim
107 words
A method of preparing electroconductive, heat resistant alkali metal titanates which comprises heating, under a non-oxidative, non-hydrogenous atmosphere, a mixture consisting essentially of at least one alkali metal compound capable of being decomposed by heating into an oxide of the alkali metal and a gas, and titanium dioxide, in the presence of at least one carbide of an element selected from Group IV of the Periodic Table, said titanium dioxide and said alkali metal compound being present in the mixture in such proportions that the ratio of the number of titanium atoms to the number of alkali metal atoms is in the range of 1:1 to 1:10.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein said alkali metal compound is selected from the group consisting of alkali metal carbonates, alkali metal chlorides and alkali metal oxalates.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein said carbide is selected from the group consisting of silicon carbide and titanium carbide.
Claim 5
Dependent Claim
25 words
A method according to claim 1, wherein said mixture additionally comprises a void-forming agent that decomposes, vaporizes or burns at a temperature below 500° C.
Claim 6
Dependent Claim
42 words
A method according to claim 4, wherein said void-forming agent is selected from the group consisting of water, hydrocarbon compounds, glycerol, ethylene glycol, starch, saccharides, nitrogen-containing compounds, polyvinyl alcohol, synthetic resins, polyvinyl acetate resin, atactic polyethylene, liquid polypropylene, polybutene and acrylic resin.
Claim 7
Dependent Claim
19 words
A method according to claim 5, wherein said void-forming agent is liquid paraffin, ethylene glycol, glycerol, or polyvinyl alcohol.
Claim 8
Dependent Claim
84 words
A method according to claim 4 which additionally comprises the steps of: (a) molding the alkali metal compound, titanium dioxide, carbide and void-forming agent into a composite prior to heating; (b) deaerating the composite under a non-oxidative atmosphere at a temperature not higher than 100° C.; (c) gradually increasing the temperature of the atmosphere to between 900° and 1150° C. and maintaining the temperature at said level for 3 to 6 hours; and (d) gradually cooling the atmosphere and the composite to ambient temperature.
Claim 9
Dependent Claim
33 words
A method according to claim 1, wherein the non-oxidative atmosphere comprises more than 90% by volume of at least one gas selected from the group consisting of non-hydrogenous reducing gases and inert gases.
Claim 10
Dependent Claim
13 words
A method according to claim 8, wherein said reducing gas is carbon monoxide.
Claim 11
Dependent Claim
16 words
A method according to claim 8, wherein said inert gases are nitrogen, helium and carbon dioxide.
Claim 12
Dependent Claim
33 words
A method according to claim 1, wherein the carbide is present in an amount equal to 5 to 100% by weight of the total weight of titanium dioxide and the alkali metal compound.
Claim 13
Dependent Claim
32 words
A method according to claim 11, wherein the carbide is present in an amount equal to 10 to 40% by weight of the total weight of titanium dioxide and alkali metal compound.
Claim 14
Dependent Claim
21 words
A method according to claim 1, wherein the mixture is compressed together with the carbide under reduced pressure prior to heating.
Claim 15
Dependent Claim
20 words
A method according to claim 1, wherein said heating is effected at a temperature of 900° C. to 1300° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |