US5352286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-phase passivation of metal pigments
Assignee: BASF SE
•
Filing: 1993-10-14
•
Granted: 1994-10-04
•
Expires: 2013-10-14
Abstract
Abstract A simple process for achieving very active passivation of metal pigments against hydroxyl-containing compounds comprises treating the metal pigments with passivators in the gas phase.
Inventors
- 👤 Raimund Schmid
- 👤 Norbert Mronga
- 👤 Juan A. G. Gomez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:47
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/62; C09C1/64; C09C1/642; C09C1/66; C09C3/00; C09C3/06; C09C3/063; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/12; C01P2006/80
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A process for passivating metal pigments against hydroxyl-containing compounds, which comprises treating the metal pigments with passivators in the gas phase.
Claim 2
Dependent Claim
21 words
A process for passivating metal pigments against hydroxyl-containing compounds, which comprises treating the metal pigments with passivators in the gas phase.
Claim 3
Dependent Claim
15 words
A process as claimed in claim 1, wherein the metal pigments are passivated against water.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1, wherein the passivators used are phosphorus, chromium or vanadium compounds or mixtures thereof.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein the passivators used are phosphorus or chromium compounds or mixtures thereof.
Claim 6
Dependent Claim
17 words
A process as claimed in claim 1, wherein passivation is effected in the presence of water vapor.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1, wherein the passivation is effected at from 100° to 350° C.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 6, wherein the passivation is effected at from 130° to 220° C.
Claim 9
Dependent Claim
27 words
A process as claimed in claim 1, wherein uncoated or metal oxide-coated metal pigments of iron, iron alloys, copper, copper alloys, aluminum or aluminum alloys are passivated.
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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) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |