Patent US4026839A successfully refreshed from Google Patents.
US4026839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphosphazene polymer/silicone rubber blends and foams therefrom
Assignee: Armstrong World Industries Inc
•
Filing: 1976-08-30
•
Granted: 1977-05-31
•
Expires: 1996-08-30
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
2026-10-30 21:06
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
110 words
A foamed 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 on 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
110 words
A foamed 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 on 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
16 words
A foamed blend, as in claim 1, where the poly(organosiloxane) (B) contains vinyl or allyl groups.
Claim 4
Dependent Claim
14 words
A foamed blend, as in claim 2, where the poly(organosiloxane) (B) contains vinyl groups.
Claim 5
Dependent Claim
14 words
A foamed blend, as in claim 1, wherein the poly(organosiloxane) is a phenyl vinyldimethylpolysiloxane.
Claim 6
Dependent Claim
33 words
A foamed 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 7
Dependent Claim
16 words
A foamed blend, as in claim 5, where the poly(organosiloxane) (B) contains vinyl or allyl groups.
Claim 8
Dependent Claim
14 words
A foamed blend, as in claim 6, where the poly(organosiloxane) (B) contains vinyl groups.
Claim 9
Dependent Claim
14 words
A foamed blend, as in claim 5, wherein the poly(organosiloxane) is a phenyl vinyldimethylpolysiloxane.
References Cited (Backward Citations)
US3856712A
Cited
US3856713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |