US4097301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable chloride process anatase slurries
Assignee: EIDP Inc
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Filing: 1977-03-30
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Granted: 1978-06-27
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Expires: 1997-03-30
Abstract
Abstract Process for producing aqueous slurries of chloride process anatase titanium dioxide pigment by adding to the slurry from 0.03 to 0.45% by weight of sodium aluminate or aluminum trichloride, calculated as Al 2 O 3 and based on the weight of the titanium dioxide pigment. The resulting slurries retain relatively low viscosity for at least one day.
Inventors
- 👤 Hans-Achim Dietmar Wildt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:07
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
In a process for the production of anatase titanium dioxide pigment by ( 1) oxidizing titanium tetrachloride in th vapor phase to form anatase titanium dioxide pigment and (2) combining the anatase titanium dioxide pigment from the oxidation reactor with water to form an aqueous slurry, the improvement for producing highly concentrated slurry having stable viscosity comprising adding to said aqueous slurry, consisting essentially of from 600 g/l to 1400 g/l of anatase titanium dioxide pigment, from 0.03 to 0.45% by weight of an inorganic aluminum compound selected from sodium aluminate and aluminum trichloride, calculated as Al 2 O 3 and based on the weight of the titanium dioxide pigment.
Claim 2
Dependent Claim
110 words
In a process for the production of anatase titanium dioxide pigment by ( 1) oxidizing titanium tetrachloride in th vapor phase to form anatase titanium dioxide pigment and (2) combining the anatase titanium dioxide pigment from the oxidation reactor with water to form an aqueous slurry, the improvement for producing highly concentrated slurry having stable viscosity comprising adding to said aqueous slurry, consisting essentially of from 600 g/l to 1400 g/l of anatase titanium dioxide pigment, from 0.03 to 0.45% by weight of an inorganic aluminum compound selected from sodium aluminate and aluminum trichloride, calculated as Al 2 O 3 and based on the weight of the titanium dioxide pigment.
Claim 3
Dependent Claim
25 words
Process for the production of anatase titanium dioxide pigment according to claim 1 wherein the pH of the final slurry is from 3 to 4.5.
Claim 4
Dependent Claim
30 words
Process for the production of anatase titanium dioxide pigment according to claim 1 wherein from 0.1 to 0.3% by weight of said inorganic aluminum compound is added to said slurry.
Claim 5
Dependent Claim
21 words
Process for the production of anatase titanium dioxide pigment according to claim 3 wherein said inorganic aluminum compound is sodium aluminate.
References Cited (Backward Citations)
US3146119A
Cited
US3859115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |