US3663174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of passivated red phosphorus
Assignee: Knapsack AG
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Filing: 1970-12-22
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Granted: 1972-05-16
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Expires: 1990-12-22
Abstract
Abstract Production of passivated red phosphorus. Between about 10 and 85 weight percent powdered red phosphorus having a particle size of up to 100 microns is treated with between about 90 and 15 weight percent of molten Epsilon -caprolactam, under inert gas; the resulting homogeneous and phosphorus-containing blend is cooled in a suitable cooler until solid; and solidified material in the form of lumps or scale is removed from the cooler.
Inventors
- 👤 Franz-Josef Dany
- 👤 Klaus Komorniczyk
- 👤 Hilmar Roszinski
- 👤 Gerhard Kalteyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:39
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/10; C01; C01B; C01B25/00; C01B25/003; C01B25/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A process for the manufacture of passivated red phosphorus which comprises subjecting between about 10 and 85 weight percent of powdered red phosphorus having a particle size of up to 100 microns to treatment with between about 90 and 15 weight percent of molten epsilon -caprolactam, under inert gas; cooling the resulting homogeneous and phosphorus-containing melt in a cooler until solid; and removing solidified lumpy or scaly material from the cooler.
Claim 2
Dependent Claim
17 words
The process as claimed in claim 2, wherein the solidified material is transformed into powder or granules.
Claim 3
Dependent Claim
17 words
The process as claimed in claim 2, wherein the red phosphorus is introduced into molten epsilon -caprolactam.
Claim 4
Dependent Claim
33 words
The process as claimed in claim 2, wherein the red phosphorus is intimately blended first with solid finely divided epsilon -caprolactam and the resulting blend is heated to melt the epsilon -caprolactam therein.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 5, wherein the blend is heated to a temperature of between about 80* and 90* C.
Claim 6
Dependent Claim
22 words
The process as claimed in claim 2, wherein the red phosphorus has a particle size of between about 5 and 60 microns.
Claim 7
Dependent Claim
31 words
The process as claimed in claim 2, wherein between about 60 and 75 weight percent of red phosphorus are treated with between about 40 and 25 weight percent of epsilon -caprolactam.
Claim 8
Dependent Claim
16 words
The process as claimed in claim 2, wherein the inert gas is nitrogen or carbon dioxide.
Claim 9
Dependent Claim
20 words
The process as claimed in claim 2, wherein the phosphorus-containing melt is cooled on a cooling roller or belt cooler.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |