Patent US4022710A successfully refreshed from Google Patents.
US4022710A
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Process for producing colloidal antimony oxide
Assignee: Japan Exlan Co Ltd
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Filing: 1976-05-10
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Granted: 1977-05-10
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Expires: 1996-05-10
Abstract
Abstract Colloidal antimony oxide is continuously produced by passing an aqueous dispersion containing antimony trioxide and hydrogen peroxide through a heated tube-type reactor.
Inventors
- 👤 Toshiyuki Kobashi
- 👤 Hirotaka Shiota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
C; C01; C01G; C01G30/00; C01G30/004; C01G30/005; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
A process for producing colloidal antimony oxide characterized by reacting an aqueous dispersion obtained by dispersing antimony trioxide and hydrogen peroxide in a ratio of 1 mol of the former to 2 mols or more of the latter into water, while passing said dispersion in the from of a plug flow through a tubular reactor having a shape represented by the formula: l/D ≧ 2000 wherein l stands for the length of the tube and D stands for the inner diameter of the tube, said aqueous dispersion having a residence time of from about 1 to 30 minutes and being maintained at a temperature of not lower than 90° C within said tubular reactor.
Claim 2
Dependent Claim
114 words
A process for producing colloidal antimony oxide characterized by reacting an aqueous dispersion obtained by dispersing antimony trioxide and hydrogen peroxide in a ratio of 1 mol of the former to 2 mols or more of the latter into water, while passing said dispersion in the from of a plug flow through a tubular reactor having a shape represented by the formula: l/D ≧ 2000 wherein l stands for the length of the tube and D stands for the inner diameter of the tube, said aqueous dispersion having a residence time of from about 1 to 30 minutes and being maintained at a temperature of not lower than 90° C within said tubular reactor.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein the aqueous dispersion contains a dispersing amount of polyvinyl alcohol as a dispersing agent.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 2, wherein the dispersing agent is used in an amount of 0.01 to 2% by weight based on the antimony trioxide.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1, wherein the aqueous dispersion contains a dispersing amount of polyacrylic acid or its salts as a dispersing agent.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 4, wherein the dispersing agent is used in an amount of 0.01 to 2% by weight based on the antimony trioxide.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1, wherein the aqueous dispersion contains a dispersing amount of lignin sulfonic acid or its salts as a dispersing agent.
Claim 8
Dependent Claim
27 words
A process as claimed in claim 6, wherein the dispersing agent is used in an amount of 0.01 to 2% by weight based on the antimony trioxide.
Claim 9
Dependent Claim
17 words
A process as claimed in claim 1 wherein the tubular reactor is made of a fluorine-containing resin.
Claim 10
Dependent Claim
13 words
A process as claimed in claim 7 wherein the flourine-containing resin is polytetrafluoroethylene.
Claim 11
Dependent Claim
28 words
A process as claimed in claim 1 wherein the aqueous dispersion is subjected to the reaction in the tubular reactor at a temperature of 95° - 140° C.
Claim 12
Dependent Claim
24 words
A process as claimed in claim 1 wherein the residence time of the aqueous dispersion in the tubular reactor is 3 to 10 minutes.
Claim 13
Dependent Claim
21 words
A process as claimed in claim 1 wherein the inner diameter D of the tubular reactor is 2 to 100 mm.
Claim 14
Dependent Claim
25 words
A process as claimed in claim 1 wherein the aqueous dispersion contains 5 - 10 mols of hydrogen peroxide per 1 mol of antimony trioxide.
Claim 15
Dependent Claim
23 words
A process as claimed in claim 1 wherein the aqueous dispersion contains antimony trioxide in a concentration of 1 - 20% by weight.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |