Patent US4344987A successfully refreshed from Google Patents.
US4344987A
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Preparation of flaky mica pigments coated with metal oxides, and use of these pigments
Assignee: BASF SE
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Filing: 1981-07-24
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Granted: 1982-08-17
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Expires: 2001-07-24
Abstract
Abstract Flaky mica pigments coated with metal oxides are prepared by oxidizing vaporizable metal carbonyls to metal oxides with oxygen at an elevated temperature in the presence of mica flakes which are kept in motion. The amount of carbonyls introduced into the reaction zone does not exceed 5% by volume of the amount of other gases introduced. The coated mica pigments are employed as pigments in surface coatings, plastics and glasses.
Inventors
- 👤 Werner Ostertag
- 👤 Knut Bittler
- 👤 Gustav Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:42
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; C01; C01P; C01P2006/00; C01P2006/12; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/30; C09C2200/301; C09C2220/00; C09C2220/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A process for the preparation of a flaky mica pigment coated with metal oxide, wherein a vaporizable metal carbonyl is oxidized with oxygen at an elevated temperature in the presence of mica flakes which are kept in motion, with the proviso that the amount of carbonyl introduced into the reaction zone does not exceed 5% by volume, based on the amount of the other gases introduced.
Claim 2
Dependent Claim
66 words
A process for the preparation of a flaky mica pigment coated with metal oxide, wherein a vaporizable metal carbonyl is oxidized with oxygen at an elevated temperature in the presence of mica flakes which are kept in motion, with the proviso that the amount of carbonyl introduced into the reaction zone does not exceed 5% by volume, based on the amount of the other gases introduced.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein the oxidation of the metal carbonyl is carried out in a fluidized bed of the mica flakes.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1 or 2, wherein the metal carbonyl employed is iron pentacarbonyl or nickel tetracarbonyl.
Claim 5
Dependent Claim
36 words
A process as claimed in claim 1, wherein the mica flakes have a mean particle size corresponding to a main dimension of from 5 to 400 μm and a thickness of from 0.03 to 30 μm.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 1, wherein the mica flakes are white wet-milled mica.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1, wherein the oxidation is carried out at from 150° to 450° C.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1, wherein the oxidation is carried out at from 180° to 250° C.
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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |