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US4036662A
Expired / Lapsed
US
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Metal additions to pigments of pseudobrookite-titanium dioxide structure
Assignee: Bayer AG
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Filing: 1975-10-20
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Granted: 1977-07-19
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Expires: 1995-10-20
Abstract
Abstract In the production of temperature-stable inorganic pigment of pseudobrookite-titanium dioxide structure having the composition Fe 2 TiO 5 .sup.. x TiO 2 , wherein x is from 0 to about 15, by preparing a suspension of finely divided titanium dioxide or titanium dioxide hydrate and at least one of finely divided iron oxide, iron oxide hydroxide, iron hydroxide and iron carbonate, removing the aqueous phase of the suspension from a solid residue and calcining the residue at a temperature in the range of about 600° to 1100°C, the improvement which comprises including in the suspension or in the solid residue at least one compound of a metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel, the compound being present in a quantity to provide about 0.1 to 10 % by weight of metal based on the pigment. With the addition of compounds of lithium, sodium, potassium, magnesium, zinc, calcium or aluminum even in small amounts a much purer yellow color results.
Inventors
- 👤 Jacob Rademachers
- 👤 Henning Erfurth
- 👤 Franz Hund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:25
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/04; C04; C04B; C04B14/00; C04B14/02; C04B14/36; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C09; C09C; C09C1/00; C09C1/36; C01; C01P; C01P2002/00; C01P2002/30; C01P2002/50; C01P2002/52
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
64 words
A temperature-stable inorganic pigment of pseudo-brookite-titanium dioxide structure having the composition Fe 2 TiO 5 .sup.. x TiO 2 , wherein x is from 0 to about 15, and containing about 0.1 to 10% by weight of the pigment of at least one metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel.
Claim 2
Dependent Claim
64 words
A temperature-stable inorganic pigment of pseudo-brookite-titanium dioxide structure having the composition Fe 2 TiO 5 .sup.. x TiO 2 , wherein x is from 0 to about 15, and containing about 0.1 to 10% by weight of the pigment of at least one metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel.
Claim 3
Dependent Claim
28 words
A pigment according to claim 1, wherein x is about 2 to 4 and said metal is present in about 0.1 to 5% by weight of the pigment.
Claim 4
Dependent Claim
36 words
A pigment according to claim 1, wherein x is about 3, said metal is lithium, sodium, potassium, magnesium, zinc, calcium or aluminum and it is present in about 0.1 to 2% by weight of the pigment.
Claim 5
Dependent Claim
149 words
In the production of a temperature-stable inorganic pigment according to claim 1 of pseudobrookite-titanium dioxide structure having the composition Fe 2 TiO 5 .sup.. x TiO 2 , wherein x is from 0 to about 15 by preparing a suspension of finely divided titanium dixoide or titanium dioxide hydrate and at least one of finely divided iron oxide, iron oxide hydroxide, iron hydroxide and iron carbonate, removing the aqueous phase of the suspension from a solid residue and calcining the residue at a temperature in the range of about 600° to 1100° C., the improvement which comprises including in the suspension at least one compound of a metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel, the compound being present in a quantity to provide about 0.1 to 10% by weight of metal based on the pigment.
Claim 6
Dependent Claim
22 words
A process according to claim 4, wherein the metal compound present in the suspension is at least one salt, oxide or hydroxide.
Claim 7
Dependent Claim
36 words
A process according to claim 4, wherein x is about 2 to 4 and said metal compound is present in amount sufficient to provide about 0.1 to 5% of said metal by weight of the pigment.
Claim 8
Dependent Claim
42 words
A process according to claim 4, wherein x is about 3, said metal is lithium, sodium, potassium, magnesium, zinc, calcium or aluminum, and said metal compound is present in amount sufficient to provide about 0.1 to 2% by weight of the pigment.
Claim 9
Dependent Claim
151 words
In the production of a temperature-stable inorganic pigment according to claim 1 and of pseudobrookite-titanium dioxide structure having the composition Fe 2 TiO 5 : x TiO 2 , wherein x is from 0 to about 15 by preparing a suspension of finely divided titanium dioxide or titanium dioxide hydrate and at least one of finely divided iron oxide, iron oxide hydroxide, iron hydroxide and iron carbonate, removing the aqueous phase of the suspension from a solid residue and calcining the residue at a temperature in the range of about 600° to 1100° C., the improvement which comprises including in the solid residue at least one compound of a metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel, the compound being present in a quantity to provide about 0.1 to 10% by weight of metal based on the pigment.
Claim 10
Dependent Claim
23 words
A process according to claim 8, wherein the metal compound present in the solid residue is at least one salt, oxide or hydroxide.
Claim 11
Dependent Claim
36 words
A process according to claim 8, wherein x is about 2 to 4 and said metal compound is present in amount sufficient to provide about 0.1 to 5% of said metal by weight of the pigment.
Claim 12
Dependent Claim
42 words
A process according to claim 8, wherein x is about 3, said metal is lithium, sodium, potassium, magnesium, zinc, calcium or aluminum, and said metal compound is present in amount sufficient to provide about 0.1 to 2% by weight of the pigment.
Claim 13
Dependent Claim
13 words
The pigment of claim 1 present as the coloring agent in a glaze.
Claim 14
Dependent Claim
13 words
The pigment of claim 1 present as the coloring agent in a ceramic.
Claim 15
Dependent Claim
13 words
The pigment of claim 1 present as the coloring agent in an enamel.
Claim 16
Dependent Claim
13 words
The pigment of claim 1 present as the coloring agent in a lime-sand-brick.
Claim 17
Dependent Claim
15 words
The pigment of claim 1 present as the coloring agent in a water-glass-based stoving coating.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |