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US4404254A
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Production of lamellar iron oxide pigments
Assignee: BASF SE
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Filing: 1981-07-07
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Granted: 1983-09-13
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Expires: 2001-07-07
Abstract
Abstract Synthetic, hexagonal, lamellar iron oxide particles, suitable as corrosion-inhibiting or decorative colored pigments, containing about 0.1 to 12% by weight of at least one oxide of an element of the IVth, Vth or VIth Main and Secondary Groups and of the IInd Secondary Group of the Periodic System of Elements.
Inventors
- 👤 Gerhard Franz
- 👤 Franz Hund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:17
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C09C1/24; C09C1/245; C01; C01G; C01G49/00; C01G49/02; C01G49/06; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; C01P; C01P2002/00; C01P2002/60; C01P2004/00; C01P2004/20; C01P2004/22; C01P2004/54; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/62; C01P2006/65; C01P2006/66; C01P2006/80; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
44 words
Synthetic, hexagonal, lamellar iron oxide particles substantially homogeneously about 0.1 to 12% by weight of at least one oxide of an element of the IVth, Vth or VIth Main and Secondary Groups and of the IInd Secondary Group of the Periodic System of elements.
Claim 2
Dependent Claim
44 words
Synthetic, hexagonal, lamellar iron oxide particles substantially homogeneously about 0.1 to 12% by weight of at least one oxide of an element of the IVth, Vth or VIth Main and Secondary Groups and of the IInd Secondary Group of the Periodic System of elements.
Claim 3
Dependent Claim
23 words
Iron oxide particles as claimed in claim 1, containing at least one of the oxides of silicon, germanium, zinc, titanium, zirconium and phosphorus.
Claim 4
Dependent Claim
27 words
Iron oxide particles as claimed in claim 1, containing about 0.1 to 9% by weight of at least one of the oxides of silicon, germanium and phosphorus.
Claim 5
Dependent Claim
19 words
Iron oxide particles as claimed in claim 1, containing about 0.1 to 5% by weight of SiO 2 .
Claim 6
Dependent Claim
26 words
Iron oxide particles as claimed in claim 1, additionally containing at least one oxide of an element of the Third Main Group of the Periodic System.
Claim 7
Dependent Claim
22 words
Iron oxide particles as claimed in claim 1, additionally containing at least one of the oxides of manganese, cobalt, nickel and rhodium.
Claim 8
Dependent Claim
14 words
Iron oxide particles as claimed in claim 1, having the crystal structure of hematite.
Claim 9
Dependent Claim
78 words
In the hydrothermal production and growth of hexagonal lamellar α-iron oxide particles, the improvement which comprises effecting such growth in the presence of at least one compound of an element of the IVth, Vth or VIth Main and Secondary Groups and of the IInd Secondary Group of the Periodic System of elements whereby the resulting particles are hexagonal and lamellar and the ratio of lamella diameter to lamella thickness thickness depends on the added amounts of said elements.
Claim 10
Dependent Claim
78 words
In the hydrothermal production and growth of hexagonal lamellar α-iron oxide particles, the improvement which comprises effecting such growth in the presence of at least one compound of an element of the IVth, Vth or VIth Main and Secondary Groups and of the IInd Secondary Group of the Periodic System of elements whereby the resulting particles are hexagonal and lamellar and the ratio of lamella diameter to lamella thickness thickness depends on the added amounts of said elements.
Claim 11
Dependent Claim
16 words
A process as claimed in claim 8, in which said element is germanium, titanium or zirconium.
Claim 12
Dependent Claim
16 words
A process as claimed in claim 8 in which said element is silicon, germanium or phosphorus.
Claim 13
Dependent Claim
13 words
A process as claimed in claim 8, in which said element is silicon.
Claim 14
Dependent Claim
37 words
A process as claimed in claim 8, growth of the hexagonal, lamellar--iron oxide particles being effected in the presence of at least one compound of the elements manganese, cobalt, nickel and rhodium in the trivalent oxidation state.
Claim 15
Dependent Claim
52 words
A process as claimed in claim 8, in which the principal compound from which the particles are being grown are iron(III)-compounds, growth being affected in aqueous solution or suspensions at a temperature above that at which there occurs complete conversion of the compound used into α-iron oxide, at least above 100° C.
Claim 16
Dependent Claim
30 words
A process as claimed in claim 13, the process including the further steps of separating the lamellar hematite crystals, washing them, and converting them into hexagonal lamellar magnetite or maghemite.
Claim 17
Dependent Claim
23 words
Iron oxide particles according to claim 1 present as a corrosion-inhibiting or decorative colored pigment in a synthetic resin, plastic, glaze or enamel.
Claim 18
Dependent Claim
31 words
A magnetic recording support, magneto-optical display or storage device including a ferrite with the crystal structure of spinel or barium hexaferrite and made from iron oxide particles according to claim 1.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |