US4123503A
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Catalysis of phosphazene cyclics to polymer, using Lewis acid compounds
Assignee: Bridgestone Firestone Inc
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Filing: 1977-03-23
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Granted: 1978-10-31
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Expires: 1997-03-23
Abstract
Abstract Thermal polymerization of (NPCl2)3,4 is improved by conducting the polymerization in the presence of Lewis Acid type compounds of Al or B.
Inventors
- 👤 Dennis L. Snyder
- 👤 Mark L. Stayer, Jr.
- 👤 Jung W. Kang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:23
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A process for polymerizing cyclic (NPCl 2 ) n in which n is an integer smaller than 7 which comprises heating said polydichlorophosphazene in the presence of an effective amount of a catalyst comprising a Lewis Acid compound selected from the group consisting of (1) organo metallic compounds of a Group IIIA metal represented by the general formula R a MX b in which M is a metal of Group IIIA having a valence of a+b, X is anionic, R is a monovalent hydrocarbon radical selected from the group consisting of alkyl, aryl, cycloalkyl, alkaryl and arylalkyl, and a is an integer from 1 to 3 and b is an integer from 0 to 3 and (2) boron halides represented by the formula BX 3 wherein X is selected from the group consisting of F, Cl and Br and at temperatures up to about 290° C. to produce a substantially linear (NPCl 2 ) m polymer in which m is between about 10 and about 50,000.
Claim 2
Dependent Claim
166 words
A process for polymerizing cyclic (NPCl 2 ) n in which n is an integer smaller than 7 which comprises heating said polydichlorophosphazene in the presence of an effective amount of a catalyst comprising a Lewis Acid compound selected from the group consisting of (1) organo metallic compounds of a Group IIIA metal represented by the general formula R a MX b in which M is a metal of Group IIIA having a valence of a+b, X is anionic, R is a monovalent hydrocarbon radical selected from the group consisting of alkyl, aryl, cycloalkyl, alkaryl and arylalkyl, and a is an integer from 1 to 3 and b is an integer from 0 to 3 and (2) boron halides represented by the formula BX 3 wherein X is selected from the group consisting of F, Cl and Br and at temperatures up to about 290° C. to produce a substantially linear (NPCl 2 ) m polymer in which m is between about 10 and about 50,000.
Claim 3
Dependent Claim
60 words
The process of claim 1 in which the catalyst is an Al compound represented by the formula R an Al n Z bn in which n is either 1 or 2, a + b equals, 3n, Z is selected from the group consisting of alkyl, halogen, alkoxy and hydride and R, a and b are as defined in claim 1.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the amount of catalyst present is up to 10 m moles/100 g of (NPCl 2 ) n .
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein n is an integer selected from the group consisting of 3,4 and mixtures of 3 and 4.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the temperature is about 170° C.
Claim 7
Dependent Claim
24 words
The process of claim 3 wherein the amount of catalyst is about 0.1 to 0.5 m moles/100 g of (NPCl 2 ) n .
References Cited (Backward Citations)
US3026174A
Cited
US4005171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |