US3928668A
Expired / Lapsed
US
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Electrostatic deposition of dry ceramic powders
Assignee: Vibrantz Corp
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Filing: 1974-05-06
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Granted: 1975-12-23
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Expires: 1994-05-06
Abstract
Abstract A novel dry ceramic powder and process for its electrostatic deposition are disclosed, characterized in that the powder is coated with a liquid, curable organopolysiloxane which is polymerized to a solid form before the powder is deposited. Preferably, the polysiloxane is monosubstituted, leaving hydrogen linkages which react with surfaces of the particles comprising the ceramic powder and thereby chemically unite the polysiloxane with the particles. The present ceramic powder can be electrostatically deposited onto a substrate and retain an electrostatic charge for appreciable periods of time, even in environments having fairly high relative humidities, for example 75% and higher.
Inventors
- 👤 Jerry D Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:09
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/4584; C04B41/50; C04B41/5025; C08; C08K; C08K7/00; C08K7/16; C08K7/18; C09; C09D; C09D183/00; C09D183/04; C23; C23D; C23D5/00; C23D5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
AN IMPROVED PROCESS FOR FORMING A CERAMIC COAT ON A SUBSTRATE BY ELECTROSTATICALLY DEPSOITING THEREON A CERAMIC POWDER HAVING AN EXTENDED RETENTION TIME OF AN ELECTRIC CHARGE, COMPRISING: A. COATING SAID CERAMIC POWDER WITH A LIQUID, CURABLE ORGANOPOLYSILOXANE HAVING THE FORMULA:
Claim 2
Dependent Claim
41 words
AN IMPROVED PROCESS FOR FORMING A CERAMIC COAT ON A SUBSTRATE BY ELECTROSTATICALLY DEPSOITING THEREON A CERAMIC POWDER HAVING AN EXTENDED RETENTION TIME OF AN ELECTRIC CHARGE, COMPRISING: A. COATING SAID CERAMIC POWDER WITH A LIQUID, CURABLE ORGANOPOLYSILOXANE HAVING THE FORMULA:
Claim 3
Dependent Claim
11 words
The process of claim 1 in which said substrate is metallic.
Claim 4
Dependent Claim
33 words
The process of claim 1 in which said resistivity of at least about 10 12 ohm-cm is maintained for at least 20 hours in the environment having a relative humidity of about 88%.
Claim 5
Dependent Claim
34 words
The process of claim 1 in which at least half of said R substituents is hydrogen, and said polymerization of the polysiloxane includes reacting the polysiloxane through its hydrogen linkages with the ceramic powder.
Claim 6
Dependent Claim
38 words
The process of claim 4 in which at least half of said R monovalent substituents is hydrogen and the balance is methyl, and said reaction step comprises reacting the hydrogen substituents with hydroxyl groups on said ceramic powder.
Claim 7
Dependent Claim
16 words
The process of claim 1 in which polymerizing said polysiloxane includes heating the coated ceramic powder.
Claim 8
Dependent Claim
36 words
The process of claim 1 in which polymerizing said polysiloxane includes heating the coated ceramic powder at a temperature within the range of about 125*C to about 300*C for about 1 minute to about 20 minutes.
Claim 9
Dependent Claim
23 words
The process of claim 1 in which said coated ceramic particles contain from about 0.02% to about 2% by weight of the polysiloxane.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |