US4826537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamellar pigments of the general formula MnX -AlY Fe2-(X+Y) O3
Assignee: BASF SE
•
Filing: 1987-10-23
•
Granted: 1989-05-02
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Expires: 2007-10-23
Abstract
Abstract Lamellar pigments are based on iron oxide of the general formula Mn X Al Y Fe 2 -(X+Y)O 3 , where X is from 0.01 to 0.06 and Y is from 0 to 0.2. The pigments are prepared by hydrothermal treatment of an aqueous suspension which contains an iron hydroxide or iron oxide hydroxide,and an alkali metal hydroxide and/or alkali metal carbonate, in the presence of a manganese compound which is soluble in the reaction medium and in the presence or absence of an aluminum compound. The pigments are used for pigmenting coatings, printing inks, finishes, plastics, ceramic surfaces, glasses and cosmetic products.
Inventors
- 👤 Werner Ostertag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:31
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018; C09C1/22; C09C1/24; C09C1/245; C09C1/40; C09D; C09D5/00; C09D5/36; C01; C01P; C01P2002/00; C01P2002/70; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A lamellar pigment based on iron oxide of the formula Mn X Al Y Fe 2- (X+Y) O 3 where X is 0.01-0.06 and Y is 0-0.2.
Claim 2
Dependent Claim
27 words
A lamellar pigment based on iron oxide of the formula Mn X Al Y Fe 2- (X+Y) O 3 where X is 0.01-0.06 and Y is 0-0.2.
Claim 3
Dependent Claim
87 words
A process for the preparation of a lamellar pigment of the formula Mn.sub.X Al.sub.Y Fe.sub.2-(X+Y) O.sub.3 where X is 0.01-0.06 and Y is 0-0.2, which comprises: heating an aqueous suspension containing iron(III) oxide or iron(III) oxide hydroxide at a temperature above 170° C. in the presence of an alkali metal hydroxide and/or carbonate and in the presence of a manganese compound soluble in the reaction medium, whereby the hydrothermal treatment forms the lamellar pigment; separating the pigment from the reaction solution; and washing and drying the pigment.
Claim 4
Dependent Claim
87 words
A process for the preparation of a lamellar pigment of the formula Mn.sub.X Al.sub.Y Fe.sub.2-(X+Y) O.sub.3 where X is 0.01-0.06 and Y is 0-0.2, which comprises: heating an aqueous suspension containing iron(III) oxide or iron(III) oxide hydroxide at a temperature above 170° C. in the presence of an alkali metal hydroxide and/or carbonate and in the presence of a manganese compound soluble in the reaction medium, whereby the hydrothermal treatment forms the lamellar pigment; separating the pigment from the reaction solution; and washing and drying the pigment.
Claim 5
Dependent Claim
23 words
The process of claim 2, wherein an alkali metal permanganate is used as the manganese compound which is soluble in the reaction medium.
Claim 6
Dependent Claim
22 words
The process of claim 2, wherein the content of alkali metal hydroxide and/or carbonate in the suspension does not exceed 2 N.
Claim 7
Dependent Claim
20 words
The process of claim 2, wherein a temperature of from 250° to 360° C. is maintained in the hydrothermal treatment.
Claim 8
Dependent Claim
11 words
The process of claim 2, wherein the suspension contains sodium aluminate.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |