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US4146403A
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Iron oxide coated mica nacreous pigments
Assignee: Mearl Corp
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Filing: 1978-04-27
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Granted: 1979-03-27
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Expires: 1998-04-27
Abstract
Abstract Iron oxide coated mica nacreous pigments are improved by interposing a thin layer of titanium dioxide or aluminum oxide between the iron oxide and the mica.
Inventors
- 👤 Louis Armanini
- 👤 Frank Bagala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:31
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0051; C09C1/0057; C09C1/0066; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/30; C09C2200/301; C09C2220/00; C09C2220/10; C09C2220/103; Y; Y10; Y10S; Y10S106/00; Y10S106/03; Y10T; Y10T428/00; Y10T428/29; Y10T428/2911; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
A process for the preparation of a nacreous pigment having increased stripping resistance which comprises: (a) coating micaceous particles with a colorless oxide selected from the group consisting of titanium dioxide and aluminum oxide in the amorphous form by deposition from a colorless oxide precurser containing coating bath at a rate such that the resulting colorless oxide layer is 5-35 mg/m 2 and about 1 to 7 weight percent of the colorless oxide coated mica; (b) coating the colorless oxide coated micaceous particles with a mixture of α and δ iron oxide in the amorphous form in an amount such that the final calcined product contains about 20-50 weight percent iron oxide by deposition by hydrolysis from an iron compound containing coating bath; and (c) calcining the resulting particles at about 650°-950° C. to produce the desired nacreous pigment.
Claim 2
Dependent Claim
139 words
A process for the preparation of a nacreous pigment having increased stripping resistance which comprises: (a) coating micaceous particles with a colorless oxide selected from the group consisting of titanium dioxide and aluminum oxide in the amorphous form by deposition from a colorless oxide precurser containing coating bath at a rate such that the resulting colorless oxide layer is 5-35 mg/m 2 and about 1 to 7 weight percent of the colorless oxide coated mica; (b) coating the colorless oxide coated micaceous particles with a mixture of α and δ iron oxide in the amorphous form in an amount such that the final calcined product contains about 20-50 weight percent iron oxide by deposition by hydrolysis from an iron compound containing coating bath; and (c) calcining the resulting particles at about 650°-950° C. to produce the desired nacreous pigment.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said colorless oxide is titanium dioxide and said colorless oxide precurser coating bath contains about 0.05 to 3 percent titanyl sulfate.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the titanyl sulfate concentration is about 0.05 to 0.75 percent.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein the titanyl sulfate concentration is about 0.1 to 0.5 percent.
Claim 6
Dependent Claim
32 words
The process of claim 1 wherein the colorless oxide is aluminum oxide and the aluminum compound precurser concentration in the aluminum compound precurser containing coating bath is about 0.05 to 3 percent.
Claim 7
Dependent Claim
16 words
The process of claim 5 wherein the aluminum compound concentration is about 0.5 to 3 percent.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein the aluminum compound concentration is about 0.75 to 1.5 percent.
Claim 9
Dependent Claim
23 words
A non-striping iron oxide coated mica nacreous pigment having a thin interlayer of a colorless oxide produced by the process of claim 1.
Claim 10
Dependent Claim
42 words
The nacreous pigment of claim 8 wherein the iron oxide is 20 to 50 weight of the pigment, the mica is 50 to 75 weight percent of the pigment, and the colorless oxide is 0.5 to 4 weight percent of the pigment.
Claim 11
Dependent Claim
50 words
The nacreous pigment of claim 9 wherein the iron oxide is 25 to 40 weight percent of the pigment and wherein the colorless oxide is present in an amount of 5 to 35 milligrams per square meter of mica surface and has a geometric thickness of 2 to 21 mu.
Claim 12
Dependent Claim
21 words
A nacreous composition, comprising a light transmitting resinous medium having suspended therein or supported thereon the nacreous pigment of claim 8.
Claim 13
Dependent Claim
76 words
An iron oxide coated mica comprising mica having on the surface thereof a thin layer of colorless oxide selected from the group consisting of titanium dioxide, aluminum and the hydrous forms thereof, the amount of colorless oxide being 5-35 mg/m 2 mica, and the colorless oxide having on the surface thereof a mixture of α-FeOOH and δ-FeOOH, the amount of said mixture being 20-50 weight percent of the total weight of the iron oxide coated mica.
Claim 14
Dependent Claim
76 words
An iron oxide coated mica comprising mica having on the surface thereof a thin layer of colorless oxide selected from the group consisting of titanium dioxide, aluminum and the hydrous forms thereof, the amount of colorless oxide being 5-35 mg/m 2 mica, and the colorless oxide having on the surface thereof a mixture of α-FeOOH and δ-FeOOH, the amount of said mixture being 20-50 weight percent of the total weight of the iron oxide coated mica.
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) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |