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US5156889A
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Process for stabilizing metal oxide-coated mica pigments against light and moisture
Assignee: BASF Catalysts LLC
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Filing: 1991-12-11
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Granted: 1992-10-20
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Expires: 2011-12-11
Abstract
Abstract Metal oxide coated mica pigments are provided with enhanced light and moisture stability by providing on the particle surfaces of coating of hydrous aluminum oxide.
Inventors
- 👤 Carmine V. DeLuca, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:07
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0024; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C09C2200/00; C09C2200/40; C09C2200/401; C09C2210/00; C09C2210/20; C09C2220/00; C09C2220/10; Y; Y10; Y10S; Y10S106/00; Y10S106/03; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A process for stabilizing a metal oxide-coated mica pigment against light and moisture, comprising adding to an aqueous suspension of said metal oxide-coated mica pigment an aluminum compound at a rate of 0.001 to 0.07 mg Al per minute per gram of said metal oxide-coated mica to cause coating by hydrolysis so as to form on said metal oxide-coated mica pigment a hydrous aluminum oxide coating containing an amount of aluminum equal to about 0.1 to 0.8 wt % of the hydrous aluminum oxide-coated pigment.
Claim 2
Dependent Claim
85 words
A process for stabilizing a metal oxide-coated mica pigment against light and moisture, comprising adding to an aqueous suspension of said metal oxide-coated mica pigment an aluminum compound at a rate of 0.001 to 0.07 mg Al per minute per gram of said metal oxide-coated mica to cause coating by hydrolysis so as to form on said metal oxide-coated mica pigment a hydrous aluminum oxide coating containing an amount of aluminum equal to about 0.1 to 0.8 wt % of the hydrous aluminum oxide-coated pigment.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said adding an aluminum compound comprises simultaneously adding an aluminum salt solution and a basic solution.
Claim 4
Dependent Claim
25 words
The process of claim 2 in which the temperature is about 30° to 90° C. and the pH is maintained at about 4.5 to 6.5.
Claim 5
Dependent Claim
25 words
The process of claim 3 in which the temperature is about 40° to 80° C. and the pH is maintained at about 5 to 6.
Claim 6
Dependent Claim
16 words
The process of claim 2 in which the aluminum salt is aluminum chloride or aluminum sulfate.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein said adding an aluminum compound comprises simultaneously adding an aluminate solution and an acid solution.
Claim 8
Dependent Claim
25 words
The process of claim 1 in which the temperature is ambient to about 80° C. and the pH is maintained at about 7 to 9.5.
Claim 9
Dependent Claim
27 words
The process of claim 7 in which the temperature is ambient to about 20° to 65° C. and the pH is maintained at about 8 to 9.
References Cited (Backward Citations)
US4038099A
Cited
US4084983A
Cited
FR2311822A1
Cited
US4323554A
Cited
US4509988A
Cited
US4490179A
Cited
JPH0214819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |