US4693876A
Expired / Lapsed
US
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Process for the preparation of linear polychlorophosphazene
Assignee: Societe National Elf Aquitaine
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Filing: 1985-10-15
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Granted: 1987-09-15
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Expires: 2005-10-15
Abstract
Abstract A process for preparing linear polychlorophosphazenes having a terminal --PXCl 2 group, wherein X is O or S, by polycondensation of a monomer of the formula P 2 NXCl 5 , by heating to release PXCl 3 and continuing the heating after the evolution of PXCl 3 has stopped. In the process, at least the heat induced polycondensation phase after evolution of PXCl 3 has stopped is carried out in solution in a medium which is a solvent for both the monomer and the polymer and which is inert to the constituents of the polycondensation reaction. The process reduces the amount of cross-linking and produces high molecular weight polymers in a reproducible way.
Inventors
- 👤 Roger DeJaeger
- 👤 Guy Pagniez
- 👤 Philippe Potin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:24
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/025; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A process for the preparation of linear polychlorophosphazenes having a terminal group --PXCl 2 , wherein X is oxygen or sulfur, wherein a monomer of the formula P 2 NXCl 5 is polycondensed to form a polycondensation mixture by heating to release PXCl 3 and said heating is continued after the release of PXCl 3 has ceased, wherein at least the heating, following the release of PXCl 3 , is carried out in solution in a medium which is a solvent of the monomer and the polychlorophosphazene, said solvent being inert to the constituents of the polycondensation reaction.
Claim 2
Dependent Claim
98 words
A process for the preparation of linear polychlorophosphazenes having a terminal group --PXCl 2 , wherein X is oxygen or sulfur, wherein a monomer of the formula P 2 NXCl 5 is polycondensed to form a polycondensation mixture by heating to release PXCl 3 and said heating is continued after the release of PXCl 3 has ceased, wherein at least the heating, following the release of PXCl 3 , is carried out in solution in a medium which is a solvent of the monomer and the polychlorophosphazene, said solvent being inert to the constituents of the polycondensation reaction.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the solvent comprises at least one compound selected from the group consisting of aromatic hydrocarbons and chlorinated derivatives thereof.
Claim 4
Dependent Claim
29 words
A process according to claim 2, wherein said solvent comprises compounds selected from the group consisting of benzene, naphthalene, diphenyl, chlorobenzene, trichlorobenzene, dichlorobenzene, tetrachlorobenzene, pentachlorobenzene, hexachlorobenzene, chloronaphthalene and chlorodiphenyl.
Claim 5
Dependent Claim
22 words
A process according to claim 1 wherein the polycondensation is carried out at a temperature between about 125° C. and 380° C.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the polycondensation is carried out at a temperature of from about 190° C. to 350° C.
Claim 7
Dependent Claim
18 words
The process according to claim 1, wherein the polycondensation temperature is from about 200° C. to 320° C.
Claim 8
Dependent Claim
24 words
The process according to claim 1 wherein the polycondensation is carried out under a pressure of from about atmospheric pressure to about 60 bars.
Claim 9
Dependent Claim
29 words
The process of claim 1, wherein the weight of solvent for forming the solution is from about 0.1 to 5 times the weight of monomer subjected to the polycondensation.
Claim 10
Dependent Claim
29 words
The process of claim 4, wherein the weight of solvent for forming the solution is from about 0.1 to 5 times the weight of monomer subjected to the polycondensation.
Claim 11
Dependent Claim
23 words
The process of claim 1 wherein the solvent is added to the polycondensation mixture during the polycondensation with release of PXCl 3 .
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the solvent is present at the beginning of the polycondensation of the monomer.
Claim 13
Dependent Claim
38 words
The process according to claim 10 wherein the solvent does not form an azeotrope with the PXCl 3 compound and has a boiling temperature higher, by at least by 20° C., than that of said PXCl 3 compound.
Claim 14
Dependent Claim
20 words
The process of claim 1, wherein the polycondensation is effected at atmospheric pressure at the boiling temperature of the solvent.
Claim 15
Dependent Claim
35 words
The process of claim 1 wherein the polycondensation is effected under pressure and the boiling temperature of said solvent under said pressure is at least equal to the temperature selected for the polycondensation in solution.
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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |