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US5071676A
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Electroconductive particles and method for adjusting the isoelectric point thereof
Assignee: Milliken and Co
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Filing: 1990-06-28
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Granted: 1991-12-10
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Expires: 2010-06-28
Abstract
Abstract An electroconductive powder composition of antimony-containing tin oxide with an outer layer of hydrous metal oxide having an isoelectric point in the range from about 5 to 9.
Inventors
- 👤 Howard W. Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:00
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/24; C09C; C09C1/00; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2004/82; C01P2004/84; C01P2004/86; C01P2006/00; C01P2006/40; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A method for adjusting the isoelectric point of electroconductive powder particles, each particle consisting essentially of a substrate having a conductive coating layer which comprises a network of interconnecting crystallites of antimony-containing tin oxide, according to the following steps: (a) forming an aqueous slurry of said powder particles to be coated in which the slurry has a resulting concentration in the range of from about 200 to 400 g/l and a temperature in the range of from ambient to about 90° C.; (b) adding an aqueous solution of a salt containing a hydrous metal oxide which is an essentially non-conducting oxide selected from the group consisting of alumina, magnesia, zirconia, titania and cerium and having an isoelectric point in the range of from 6 to 10 to said slurry while maintaining the pH of the resulting mixture in the range of from about 5 to 9; (c) maintaining the mixture until from a partial molecular layer to about 5 monomolecular layers of metal oxide are deposited on the surface of said particles; and (d) isolating the particles.
Claim 2
Independent Claim
177 words
A method for adjusting the isoelectric point of electroconductive powder particles, each particle consisting essentially of a substrate having a conductive coating layer which comprises a network of interconnecting crystallites of antimony-containing tin oxide, according to the following steps: (a) forming an aqueous slurry of said powder particles to be coated in which the slurry has a resulting concentration in the range of from about 200 to 400 g/l and a temperature in the range of from ambient to about 90° C.; (b) adding an aqueous solution of a salt containing a hydrous metal oxide which is an essentially non-conducting oxide selected from the group consisting of alumina, magnesia, zirconia, titania and cerium and having an isoelectric point in the range of from 6 to 10 to said slurry while maintaining the pH of the resulting mixture in the range of from about 5 to 9; (c) maintaining the mixture until from a partial molecular layer to about 5 monomolecular layers of metal oxide are deposited on the surface of said particles; and (d) isolating the particles.
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) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |