US4523009A
Expired / Lapsed
US
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Polyphosphazene compounds and method of preparation
Assignee: Individual
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Filing: 1984-07-31
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Granted: 1985-06-11
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Expires: 2004-07-31
Abstract
Abstract Shown are fully alkylated/arylated polyphosphazenes having side units bonded to the phosphorus backbone by direct carbon-phosphorus bonds. A method of preparing the polyphosphazenes includes the thermal decomposition of and elimination of silanes from suitably constructed N-silylphosphinimines.
Inventors
- 👤 Robert H. Neilson
- 👤 Patty J. Wisian-Neilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/46; C07F9/535; C07F9/5355
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A linear non cross-linked phosphazene polymer, having the formula: ##STR10## wherein R is an alkyl group containing 1 to 5 carbon atoms and wherein R' is selected from the group consisting of alkyl, aryl, and lower alkyl-substituted aryl groups, said alkyl groups containing 1 to 5 carbon atoms, and said aryl and alkyl-substituted aryl groups having 6 to 10 carbon atoms; n is greater than about 175; and wherein both R and R' are bonded to phosphorus atoms by direct carbon to phosphorus bonds.
Claim 2
Dependent Claim
84 words
A linear non cross-linked phosphazene polymer, having the formula: ##STR10## wherein R is an alkyl group containing 1 to 5 carbon atoms and wherein R' is selected from the group consisting of alkyl, aryl, and lower alkyl-substituted aryl groups, said alkyl groups containing 1 to 5 carbon atoms, and said aryl and alkyl-substituted aryl groups having 6 to 10 carbon atoms; n is greater than about 175; and wherein both R and R' are bonded to phosphorus atoms by direct carbon to phosphorus bonds.
Claim 3
Dependent Claim
61 words
A linear non cross-linked phosphazene polymer, having, the formula: ##STR11## wherein R is selected from the group consisting of methyl and ethyl and R' is selected from the group consisting of methyl, ethyl, and phenyl; n is in the range of 175 to 1000; and wherein both R and R' are bonded to phosphorus atoms by direct carbon to phosphorus bonds.
Claim 4
Dependent Claim
61 words
A linear non cross-linked phosphazene polymer, having, the formula: ##STR11## wherein R is selected from the group consisting of methyl and ethyl and R' is selected from the group consisting of methyl, ethyl, and phenyl; n is in the range of 175 to 1000; and wherein both R and R' are bonded to phosphorus atoms by direct carbon to phosphorus bonds.
Claim 5
Dependent Claim
18 words
The linear phosphazene polymer of claim 2, wherein R and R' are methyl and n is approximately 650.
Claim 6
Dependent Claim
19 words
The linear phosphazene polymer of claim 2, wherein R is methyl, R' is phenyl and n is approximately 400.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |