US4137330A
Expired / Lapsed
US
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Metal salt catalyzed polymerization of (NPCl2) oligomers
Assignee: Bridgestone Firestone Inc
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Filing: 1978-02-09
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Granted: 1979-01-30
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Expires: 1998-02-09
Abstract
Abstract A process for producing benzene-soluble substantially linear dichlorophosphazene polymer having the formula (NPCl2)x, in which x is greater than 20 and may be as high as 50,000 or higher, from a cyclic oligomer having the formula (NPCl2)n, in which n is from 3 to 9, particularly the trimer (NPCl2)3 or tetramer (NPCl2)4, in the presence of a small but significant amount of an inorganic salt, preferably a halide of a metal such as Cr, Ni, Co, Cu, Fe, Mn or Mg which affords control of the molecular weight and avoids the formation of large amounts of gel.
Inventors
- 👤 Mark S. Prichard
- 👤 Ashley S. Hilton
- 👤 Mark L. Stayer, Jr.
- 👤 Thomas A. Antkowiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:53
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
106 words
The process of polymerizing a slow or ordinarily non-polymerizing exceptionally pure cyclic oligomer having the structure (NPCl 2 ) n , wherein n is from 3 to 9, which comprises polymerizing said oligomer at a temperature of from 200°-300° C. under an inert atmosphere or in a vacuum in the presence of from about 0.002 to about 0.50 weight percent of a hydrated inorganic metal halide salt, whereby the percent conversion to the resultant linear polymer represented by the structure (NPCl 2 ) x , wherein x is between 20 and 50,000, is increased as compared to the percent conversion in the absence of said salt.
Claim 2
Dependent Claim
106 words
The process of polymerizing a slow or ordinarily non-polymerizing exceptionally pure cyclic oligomer having the structure (NPCl 2 ) n , wherein n is from 3 to 9, which comprises polymerizing said oligomer at a temperature of from 200°-300° C. under an inert atmosphere or in a vacuum in the presence of from about 0.002 to about 0.50 weight percent of a hydrated inorganic metal halide salt, whereby the percent conversion to the resultant linear polymer represented by the structure (NPCl 2 ) x , wherein x is between 20 and 50,000, is increased as compared to the percent conversion in the absence of said salt.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said cyclic oligomer is (NPCl 2 ) 3 or (NPCl 2 ) 4 .
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the inorganic metal halide salt is present in an amount of from 0.005 to 0.20 weight percent.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the metal halide salt is a hydrated metal chloride.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the metal of said metal halide salt is selected from the group consisting of nickel, cobalt, chromium, magnesium, copper, iron and manganese.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the halide of said metal halide salt is selected from the group consisting of chloride, bromide, iodide and fluoride.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the metal halide salt is chromium chloride.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the metal halide salt is CrCl 3 ·6H 2 O.
Claim 10
Dependent Claim
126 words
The process of polymerizing cyclic oligomers represented by the formula (NPCl 2 ) n in which n is from 3 to 9, which comprises polymerizing said oligomers at a temperature of 200°-300° C. under an inert atmosphere or in a vacuum in the presence of from about 0.002 to about 0.50 weight percent of a hydrated inorganic metal halide salt of a metal selected from the group consisting of nickel, cobalt, chromium, magnesium, copper, iron and manganese, whereby the dilute solution viscosity of the resultant linear polymer represented by the formula (NPCl 2 ) x in which x is between 20 and 50,000 is reduced to a desired value as compared to the dilute solution viscosity of said polymer prepared in the absence of said salt.
Claim 11
Dependent Claim
126 words
The process of polymerizing cyclic oligomers represented by the formula (NPCl 2 ) n in which n is from 3 to 9, which comprises polymerizing said oligomers at a temperature of 200°-300° C. under an inert atmosphere or in a vacuum in the presence of from about 0.002 to about 0.50 weight percent of a hydrated inorganic metal halide salt of a metal selected from the group consisting of nickel, cobalt, chromium, magnesium, copper, iron and manganese, whereby the dilute solution viscosity of the resultant linear polymer represented by the formula (NPCl 2 ) x in which x is between 20 and 50,000 is reduced to a desired value as compared to the dilute solution viscosity of said polymer prepared in the absence of said salt.
Claim 12
Dependent Claim
20 words
The process of claim 9 wherein said cyclic oligomer is (NPCl 2 ) 3 or (NPCl 2 ) 4 .
Claim 13
Dependent Claim
15 words
The process of claim 9 wherein the metal halide salt is a hydrated metal chloride.
Claim 14
Dependent Claim
25 words
The process of claim 9 wherein the halide of said metal halide salt is selected from the group consisting of chloride, bromide, iodide and fluoride.
Claim 15
Dependent Claim
13 words
The process of claim 9 wherein the metal halide salt is chromium chloride.
Claim 16
Dependent Claim
16 words
The process of claim 9 wherein the metal halide salt is CrCl 3 ·6H 2 O.
Claim 17
Dependent Claim
24 words
The process of claim 9 wherein said inorganic metal halide salt is present in an amount of from 0.005 to 0.20 percent by weight.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |