Patent US3856929A successfully refreshed from Google Patents.
US3856929A
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PRODUCTION OF ANATASE TiO{11 {11 BY THE CHLORIDE PROCESS
Assignee: EIDP Inc
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Filing: 1972-08-25
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Granted: 1974-12-24
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Expires: 1992-08-25
Abstract
Abstract Anatase TiO2 is produced by the ''''chloride'''' process involving the vapor phase oxidation of titanium tetrachloride. A silicon halide and a phosphorus halide are co-oxidized along with titanium tetrachloride to increase the percentage of anatase in the product.
Inventors
- 👤 A Angerman
- 👤 C Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:34
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
IN THE CHLORIDE PROCESS FOR PRODUCING TIO2 PIGMENT BY THE OXIDATION OF TITANIUM TETRACHLORIDE WITH AN OXYGEN-CONTAINING GAS IN THE VAPOR PHASE AT AN ELEVATED TEMPERATURE, THE IMPROVEMENT FOR PRODUCING AT LEAST ABOUT 80 WEIGHT PERCENTAGE OF ANATASE OF GOOD DISPERSIBILITY AND UNDERTONE BY EFFECTING THE OXIDATION IN THE PRESSURE OF A SILICON HALIDE AND A PHOSPHORUS HALIDE, SAID HALIDES BEING GASEOUS AND OXIDIZABLE AT SAID TEMPERATURE, AND SAID HALIDES BEING PRESENT IN AMOUNTS TO PROVIDE WEIGHT PERCENTAGE OF 0.4 TO 1 PERCENT OXIDIZED SILICON HALIDE, CALCULATED AS SIO2, AND 0.1 TO 0.5 PERCENT OXIDIZED PHOSPHOROUS HALIDE, CALCULATED AS P2O5, IN SAID PIGMENT.
Claim 2
Dependent Claim
103 words
IN THE CHLORIDE PROCESS FOR PRODUCING TIO2 PIGMENT BY THE OXIDATION OF TITANIUM TETRACHLORIDE WITH AN OXYGEN-CONTAINING GAS IN THE VAPOR PHASE AT AN ELEVATED TEMPERATURE, THE IMPROVEMENT FOR PRODUCING AT LEAST ABOUT 80 WEIGHT PERCENTAGE OF ANATASE OF GOOD DISPERSIBILITY AND UNDERTONE BY EFFECTING THE OXIDATION IN THE PRESSURE OF A SILICON HALIDE AND A PHOSPHORUS HALIDE, SAID HALIDES BEING GASEOUS AND OXIDIZABLE AT SAID TEMPERATURE, AND SAID HALIDES BEING PRESENT IN AMOUNTS TO PROVIDE WEIGHT PERCENTAGE OF 0.4 TO 1 PERCENT OXIDIZED SILICON HALIDE, CALCULATED AS SIO2, AND 0.1 TO 0.5 PERCENT OXIDIZED PHOSPHOROUS HALIDE, CALCULATED AS P2O5, IN SAID PIGMENT.
Claim 3
Dependent Claim
15 words
Process according to claim 1 wherein said halides are silicon tetrachloride and phosphorus trichloride, respectively.
Claim 4
Dependent Claim
33 words
Process according to claim 1 wherein there is present in the reaction zone a metal ion nucleant selected from the group consisting of sodium, potassium, lithium, rubidium, cesium, calcium, barium, strontium, and cerium.
Claim 5
Dependent Claim
25 words
Process according to claim 3 wherein said nucleant is present in the amount of about 1 to 5,000 parts per million, based on said pigment.
Claim 6
Dependent Claim
96 words
In the chloride process for producing TiO2 pigment by the oxidation of titanium tetrachloride with an oxygen-containing gas in the vapor phase at an elevated temperature, the improvement for producing anatase of good dispersibility and undertone by effecting the oxidation in the presence of a silicon halide and a phosphorus halide, said halides being gaseous and oxidizable at said temperature, and said halides being present in amounts to provide weight percentage of 0.4 to 0.65 percent oxidized silicon halide, calculated as SiO2, and 0.15 to 0.35 percent oxidized phosphorus halide, calculated as P2O5, in said pigment.
Claim 7
Dependent Claim
96 words
In the chloride process for producing TiO2 pigment by the oxidation of titanium tetrachloride with an oxygen-containing gas in the vapor phase at an elevated temperature, the improvement for producing anatase of good dispersibility and undertone by effecting the oxidation in the presence of a silicon halide and a phosphorus halide, said halides being gaseous and oxidizable at said temperature, and said halides being present in amounts to provide weight percentage of 0.4 to 0.65 percent oxidized silicon halide, calculated as SiO2, and 0.15 to 0.35 percent oxidized phosphorus halide, calculated as P2O5, in said pigment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |