US4113841A
Expired / Lapsed
US
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Stabilized red phosphorus and process for making it
Assignee: Hoechst AG
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Filing: 1977-07-13
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Granted: 1978-09-12
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Expires: 1997-07-13
Abstract
Abstract The invention provides stabilized pulverulent red phosphorus. It comprises a homogeneous blend of red phosphorus particles with a size of at most about 2 mm and a metal compound of the second or third group of the Periodic System as an oxidation stabilizer, wherein the metal compound is the aluminum, magnesium, calcium or zinc salt of an alkyl-, cycloalkyl-, aryl- or aralkylphosphonic acid having 1 to 20 carbon atoms, the metal compound being present in the homogeneous blend in a proportion of about 0.5 to 5 weight %.
Inventors
- 👤 Horst Staendeke
- 👤 Franz-Josef Dany
- 👤 Joachim Kandler
- 👤 Theodor Auel
- 👤 Werner Kloss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:17
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/006
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
Pulverulent red phosphorus comprising a homogeneous blend of red phosphorus particles with a size of at most about 2 mm and the aluminum, magnesium, calcium or zinc salt of an alkyl-, cycloalkyl-, aryl- or aralkylphosphonic acid having 1 to 20 carbon atoms, the salt being present in the homogeneous blend in a proportion of about 0.5 to 5 weight %.
Claim 2
Dependent Claim
60 words
Pulverulent red phosphorus comprising a homogeneous blend of red phosphorus particles with a size of at most about 2 mm and the aluminum, magnesium, calcium or zinc salt of an alkyl-, cycloalkyl-, aryl- or aralkylphosphonic acid having 1 to 20 carbon atoms, the salt being present in the homogeneous blend in a proportion of about 0.5 to 5 weight %.
Claim 3
Dependent Claim
19 words
Red phosphorus as claimed in claim 1, wherein the particles have a size of about 0.01 to 0.15 mm.
Claim 4
Dependent Claim
21 words
Red phosphorus as claimed in claim 1, wherein the alkyl-, cycloalkyl-, aryl- or aralkylphosphonic acid has 4 to 18 carbon atoms.
Claim 5
Dependent Claim
33 words
Red phosphorus as claimed in claim 1, wherein the salt is the aluminum, magnesium, calcium or zinc salt of octane-, decane-, dodecane-, benzene-, cyclohexene-3-, 2-phenylethane-1-, 2-phenylethylene-1, 2-carboxyethane-1-, cyclohexane-, vinyl-, 2-chloroethane-1 or propane-phosphonic acid.
Claim 6
Dependent Claim
24 words
Red phosphorus as claimed in claim 1, wherein the homogeneous blend contains the metal compound in a proportion of 0.5 to 3 weight %.
Claim 7
Dependent Claim
160 words
In a process for making a homogeneous blend of red phosphorus having a particle size of at most about 2 mm and the aluminum, magnesium, calcium or zinc salt of an alkyl-, cycloalkyl-, aryl- or aralkylphosphonic acid having 1 to 20 carbon atoms, as an oxidation stabilizer, the improvement which comprises: intimately blending red phosphorus particles with a size of at most about 2 mm with about 0.5 to 5 weight %, based on red phosphorus, of an alkyl-, cycloalkyl-, aryl or aralkyl-phosphonic acid having 1 to 20 carbon atoms; suspending the blend in water and heating the resulting suspension to about 60° to 95° C; gradually admixing the suspension with at least stoichiometric proportions of an aqueous solution of a water-soluble aluminum, magnesium, calcium or zinc salt to cause precipitation of the respective phosphonic acid salt from the aqueous suspension at a pH of 3.0 to 6.0; filtering the resulting mixture, and drying the filter residue at elevated temperature.
Claim 8
Dependent Claim
160 words
In a process for making a homogeneous blend of red phosphorus having a particle size of at most about 2 mm and the aluminum, magnesium, calcium or zinc salt of an alkyl-, cycloalkyl-, aryl- or aralkylphosphonic acid having 1 to 20 carbon atoms, as an oxidation stabilizer, the improvement which comprises: intimately blending red phosphorus particles with a size of at most about 2 mm with about 0.5 to 5 weight %, based on red phosphorus, of an alkyl-, cycloalkyl-, aryl or aralkyl-phosphonic acid having 1 to 20 carbon atoms; suspending the blend in water and heating the resulting suspension to about 60° to 95° C; gradually admixing the suspension with at least stoichiometric proportions of an aqueous solution of a water-soluble aluminum, magnesium, calcium or zinc salt to cause precipitation of the respective phosphonic acid salt from the aqueous suspension at a pH of 3.0 to 6.0; filtering the resulting mixture, and drying the filter residue at elevated temperature.
Claim 9
Dependent Claim
21 words
The process as claimed in claim 6, wherein the red phosphorus particles have a size of about 0.01 to 0.15 mm.
Claim 10
Dependent Claim
26 words
The process as claimed in claim 6, wherein the blend is suspended in water and the suspension heated to a temperature of 80° to 90° C.
Claim 11
Dependent Claim
29 words
The process as claimed in claim 6, wherein the red phosphorus particles are blended with octane-, decane-, dodecane-, benzene-, cyclohexene-3-, 2-phenylethane-1-, 2-phenylethylene-1-, 2-carboxyethane-1-, cyclohexane-, vinyl-, 2-chloroethane or propane-phosphonic acid.
Claim 12
Dependent Claim
28 words
The process as claimed in claim 6, wherein the red phosphorus particles are blended with 0.5 to 3 weight % of the alkyl-, cycloalkyl-, aryl or aralkylphosphonic acid.
Claim 13
Dependent Claim
30 words
The process as claimed in claim 6, wherein the suspension is admixed with at least stoichiometric proportions of a 5 to 20 weight % aqueous solution of the water-soluble salt.
Claim 14
Dependent Claim
21 words
The process as claimed in claim 6, wherein the alkyl-, cycloalkyl-, aryl- or aralkyl-phosphonic acid has 4 to 18 carbon atoms.
Claim 15
Dependent Claim
47 words
The process as claimed in claim 6, wherein the water-soluble salt is Al 2 (SO 4 ) 3 · 18 H 2 O, Ca(NO 3 ) 2 · 4 H 2 O, ZnSO 4 · 7 H 2 O or MgSO 4 · 7 H 2 O.
Claim 16
Dependent Claim
29 words
The process as claimed in claim 6, wherein the aluminum salt of the respective phosphonic acid is precipitated from the aqueous suspension at a pH-value of 3.0 to 3.5.
Claim 17
Dependent Claim
32 words
The process as claimed in claim 6, wherein the magnesium, calcium or zinc salt of the respective phosphonic acid is precipitated from the aqueous suspension at a pH-value of 5.0 to 6.0.
Claim 18
Dependent Claim
21 words
The process as claimed in claim 6, wherein the filter residue is dried at a temperature of 80° to 130° C.
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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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |