US4073825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphosphazene polymer/silicone rubber blends and foams therefrom
Assignee: Armstrong World Industries Inc
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Filing: 1976-12-20
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Granted: 1978-02-14
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Expires: 1996-12-20
Abstract
Abstract This invention relates to blends of polyphosphazenes and silicone polymers. The blends of this invention can be formed into coatings, sheets or films or into flexible or semi-rigid foams. The blends are extremely fire retardant and produce low smoke loads, or essentially no smoke, when heated in an open flame.
Inventors
- 👤 Ronald L. Dieck
- 👤 Edwin J. Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L83/00; C08L83/04; C08L85/00; C08L85/02; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/70; C08J2383/00; C08J2383/04; C08J2385/00; C08J2385/02; C08J2483/00; C08J2485/00; Y; Y10; Y10S; Y10S521/00; Y10S521/903; Y10S521/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A curable polymer blend comprising: A. a polyphosphazene comprising randomly distributed repeating units represented by the formulas: ##STR6## wherein R 1 and R 2 are the same or different and are hydrogen, a C 1 - C 10 linear or branched alkyl radical, or a C 1 - C 4 linear or branched alkoxy radical substituted or any sterically permissible position on the phenoxy group, B. a poly(organosiloxane) elastomer, C. said polymer (A) being present in an amount of about 15% to about 85% by weight and said polymer (B) being present in an amount of about 85% to about 15% by weight, based on the combination of (A) and (B).
Claim 2
Dependent Claim
111 words
A curable polymer blend comprising: A. a polyphosphazene comprising randomly distributed repeating units represented by the formulas: ##STR6## wherein R 1 and R 2 are the same or different and are hydrogen, a C 1 - C 10 linear or branched alkyl radical, or a C 1 - C 4 linear or branched alkoxy radical substituted or any sterically permissible position on the phenoxy group, B. a poly(organosiloxane) elastomer, C. said polymer (A) being present in an amount of about 15% to about 85% by weight and said polymer (B) being present in an amount of about 85% to about 15% by weight, based on the combination of (A) and (B).
Claim 3
Dependent Claim
15 words
A blend, as in claim 1, where the poly(organosiloxane) (B) contains vinyl or allyl groups.
Claim 4
Dependent Claim
13 words
A blend, as in claim 2, where the poly(organosiloxane) (B) contains vinyl groups.
Claim 5
Dependent Claim
32 words
A blend, as in claim 1, where the polyphosphazene (A) (1) has randomly distributed repeating units represented by the formulas: ##STR7## where W is a substituent capable of a crosslinking chemical reaction.
Claim 6
Dependent Claim
15 words
A blend, as in claim 4, where the poly(organosiloxane) (B) contains vinyl or allyl groups.
Claim 7
Dependent Claim
13 words
A blend, as in claim 5, where the poly(organosiloxane) (B) contains vinyl groups.
Claim 8
Dependent Claim
13 words
A blend, as in claim 1, where the poly(organosiloxane) is a phenyl vinyldimethylpolysiloxane.
Claim 9
Dependent Claim
13 words
A blend, as in claim 4, where the poly(organosiloxane) is a phenyl vinyldimethylpolysiloxane.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |