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US4162278A
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Flame retardant polyphenylene ether resin compositions containing a pentaerythrityl phosphonate
Assignee: Wyeth Holdings LLC
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Filing: 1978-04-28
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Granted: 1979-07-24
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Expires: 1998-04-28
Abstract
Abstract Polyphenylene ether resin/rubber-modified, high-impact polystyrene thermoplastic compositions as rendered flame retardant by use of specific pentaerythrityl phosphonate compounds.
Inventors
- 👤 Albrecht H. Granzow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5357; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A flame retardant polyphenylene ether resin/rubber-modified, high-impact polystyrene thermoplastic composition comprising an effective flame retarding amount of a pentaerythrityl phosphonate compound represented by the formula: ##STR11## wherein R is methyl, phenyl, benzyl, or mono-, di- or trimethylbenzyl.
Claim 2
Dependent Claim
37 words
A flame retardant polyphenylene ether resin/rubber-modified, high-impact polystyrene thermoplastic composition comprising an effective flame retarding amount of a pentaerythrityl phosphonate compound represented by the formula: ##STR11## wherein R is methyl, phenyl, benzyl, or mono-, di- or trimethylbenzyl.
Claim 3
Dependent Claim
31 words
The composition of claim 1 wherein said molding composition comprises a homogeneous blend of 20 to 50 percent polyphenylene ether resin and 50 to 80 percent of rubber-modified, high-impact polystyrene resin.
Claim 4
Dependent Claim
10 words
The composition of claim 1 wherein each R is methyl.
Claim 5
Dependent Claim
10 words
The composition of claim 1 wherein each R is phenyl.
Claim 6
Dependent Claim
10 words
The composition of claim 1 wherein each R is benzyl.
Claim 7
Dependent Claim
10 words
The composition of claim 1 wherein each R is 4-methylbenzyl.
Claim 8
Dependent Claim
10 words
The composition of claim 1 wherein each R is 2,4-dimethylbenzyl.
Claim 9
Dependent Claim
9 words
The composition of claim 1 wherein R is 2,4,6-trimethylbenzyl.
Claim 10
Dependent Claim
20 words
The composition of claim 1 wherein the phosphonate is present in at least about 5% by weight of the composition.
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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |