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US5374306A
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Luster pigments based on metal oxide-coated aluminum platelets having a total carbon content of less than 0.1% by weight
Assignee: BASF SE
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Filing: 1993-07-01
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Granted: 1994-12-20
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Expires: 2013-07-01
Abstract
Abstract There are described luster pigments based on metal oxide-coated aluminum platelets wherein the substrate aluminum platelets have a total carbon content <0.1% by weight, and the preparation and use of these pigments.
Inventors
- 👤 Reinhold Schlegel
- 👤 Norbert Mronga
- 👤 Reinhold Rieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; C09C1/62; C09C1/64; C09C1/642; C09C1/644; C09C1/646; C01; C01P; C01P2006/00; C01P2006/60; C01P2006/62; C01P2006/65; C01P2006/66; C01P2006/80; C09C2200/00; C09C2200/10; C09C2200/1054; C09C2220/00; C09C2220/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
In luster pigments based on metal oxide-coated aluminum platelets, the improvement comprising employing as substrate aluminum platelets aluminum platelets having a total carbon content <0.1% by weight.
Claim 2
Dependent Claim
27 words
In luster pigments based on metal oxide-coated aluminum platelets, the improvement comprising employing as substrate aluminum platelets aluminum platelets having a total carbon content <0.1% by weight.
Claim 3
Dependent Claim
38 words
Luster pigments as claimed in claim 1 wherein the aluminum platelets have been coated A) with a first coat consisting essentially of iron oxide, and B) optionally with a second coat consisting essentially of a colorless metal oxide.
Claim 4
Dependent Claim
72 words
A process for preparing the luster pigments of claim 1, which comprises a) treating the conventionally prepared substrate aluminum platelets under agitation with an oxygen-containing gas and optionally additionally with steam at elevated temperature to reduce their total carbon content to below 0.1% by weight, and b) coating the resulting aluminum platelets with a metal oxide in a conventional manner by gas phase decomposition of volatile metal compounds using oxygen and/or steam.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 3, wherein the oxygen-containing gas of step a) contains from 1 to 5% by volume of oxygen.
Claim 6
Dependent Claim
18 words
A process as claimed in claim 3, wherein the oxygen-containing gas of step a) is an air/nitrogen mixture.
Claim 7
Dependent Claim
33 words
A process as claimed in claim 3, wherein the oxygen-containing gas of step a) has added to it for an additional water vapor treatment from 0.5 to 3% by volume of water vapor.
Claim 8
Dependent Claim
30 words
A process as claimed in claim 3, wherein, in step a), the aluminum platelets are treated initially with the oxygen-containing gas only and subsequently additionally with the water vapor-containing gas.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 3, wherein the step a) treatment of the aluminum platelets is carried out at from 150° to 270° C.
Claim 10
Dependent Claim
14 words
A process as claimed in claim 3, carried out in a fluidized bed reactor.
Claim 11
Dependent Claim
29 words
In a process for coloring paints, printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations, the improvement comprising selecting as a colorant a luster pigment of claim 1.
Claim 12
Dependent Claim
28 words
Aluminum platelets having a total carbon content <0.1% by weight, obtained by treating conventional aluminum platelets having a carbon content >0.1% by process step a) of claim 3.
References Cited (Backward Citations)
US4328042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-19 | 1998-06-20 | 1998-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-19 | 2002-06-20 | 2002-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-19 | 2006-06-20 | 2006-12-20 | $7700.00 | Window Closed / Lapsed |