US3843596A
Expired / Lapsed
US
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Stabilized phosphonitrile elastomers
Assignee: Bridgestone Firestone Inc
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Filing: 1973-05-10
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Granted: 1974-10-22
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Expires: 1993-05-10
Abstract
Abstract The stabilization of phosphazene polymers against degradiation when exposed to temperatures of about 275*F or higher, in air is achieved by the addition of controlled amounts of stabilizers to such phosphazene polymers, metal dialkyl-,alkyl-aryl-, or diaryl dithiocarbamates of zinc, lead or bismuth, or various inorganic or metallo-organic compounds, being preferred stabilizers.
Inventors
- 👤 G Kyker
- 👤 J Beckman
- 👤 A Halasa
- 👤 J Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:07
CPC Classifications
C; C08; C08L; C08L85/00; C08L85/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
A THERMALLY STABILIZED COMPOSITION COMPRISING POLYPHOSPHAZENES THE SKELETAL CHAINS OF WHICH CONSIST OF RECURRING UNITS REPRESENTED BY THE GENERAL FORMULA:
Claim 2
Dependent Claim
20 words
A THERMALLY STABILIZED COMPOSITION COMPRISING POLYPHOSPHAZENES THE SKELETAL CHAINS OF WHICH CONSIST OF RECURRING UNITS REPRESENTED BY THE GENERAL FORMULA:
Claim 3
Dependent Claim
14 words
The stabilized polyphosphazenes of claim 1 wherein R and R'' are each fluoroalkoxy groups.
Claim 4
Dependent Claim
11 words
The stabilized polyphosphazenes of claim 1, stabilized with a zinc dialkyldithiocarbamate.
Claim 5
Dependent Claim
23 words
The stabilized polyphosphazenes of claim 1 wherein the basic inorganic compound is selected from the group consisting of metal oxides, hydroxides, and carbonates.
Claim 6
Dependent Claim
21 words
The stabilized polyphosphazenes of claim 1 as a constituent of a composition containing a gum polymer of a compounded stock material.
Claim 7
Dependent Claim
16 words
The stabilized polyphosphazenes of claim 1 wherein the incorporation of stabilizer is effected in homogeneous solution.
Claim 8
Dependent Claim
16 words
The stabilized polyphosphazenes of claim 1 wherein the incorporation of stabilizer is effected by mechanical mixing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |