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Patent US3728443A successfully refreshed from Google Patents.
US3728443A
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PRODUCTION OF HIGH ASPECT RATIO ACICULAR RUTLE TiO{11
Assignee: EIDP Inc
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Filing: 1971-09-14
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Granted: 1973-04-17
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Expires: 1991-09-14
Abstract
Abstract TiO2 fibers are produced in the form of single acicular rutile crystals from a calcined blend of TiO2, salt and oxy-phosphorus components. High aspect ratio fibers are achieved by the use of water in the blend and critical control of the ratios of the solid components.
Inventors
- 👤 R Berisford
- 👤 E Joinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:37
CPC Classifications
C; C30; C30B; C30B7/00; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/08; C30B29/00; C30B29/10; C30B29/16; C30B29/60; C30B29/62; C01P; C01P2004/00; C01P2004/10; C01P2004/54; C01P2004/60; C01P2004/61; C01P2004/62; C08K2201/00; C08K2201/016
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
Process according to claim 1 wherein the salt is sodium chloride.
Claim 2
Dependent Claim
31 words
a salt selected from the group consisting of sodium chloride and mixtures of at least 50 mol percent sodium chloride with at least one other alkali metal halide or sulfate, and
Claim 3
Dependent Claim
130 words
at least one alkali metal oxyphosphorus compound as a promoter, and (b) leaching the product from the calcination step to remove soluble salts therefrom, and recovering the desired acicular rutile, the improvement, for promoting the formation of high aspect ratio crystals, wherein step (a) is operated in such a manner that: i. water Is included in the blended mixture, the amount so employed being 20 to 40 percent based on the weight of solids in the blend, ii. the ratio of salt to titanium dioxide used is 2:1 to 4.5:1 on a weight basis, iii. the ratio of salt to oxy-phosphorus compound is 5:1 to 14:1 on a weight basis, calculated on the phosphorus present, and iv. the effective alkali metal/phosphorus molar ratio of the promoter is 2.0 to 2.1.
Claim 4
Dependent Claim
17 words
Process according to claim 1 wherein the effective alkali metal/phosphorus molar ratio of said promoter is 2.0.
Claim 5
Dependent Claim
20 words
Process according to claim 1 wherein said seeding amount is 0.5 to 1 percent, based upon said preformed titanium dioxide.
Claim 6
Dependent Claim
22 words
Process according to claim 1 wherein the calcining temperature is 800*- 850* C., and the calcination period is 4 to 6 hours.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |