US4178281A
Expired / Lapsed
US
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Flame-retardant polycarbonate compositions
Assignee: Borg Warner Corp
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Filing: 1978-05-30
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Granted: 1979-12-11
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Expires: 1998-05-30
Abstract
Abstract Flame-retardant polycarbonate compositions containing a pentaerythritol diphosphonate or diphosphate. A halogenated organic compound having at least about 30% halogen may also be present.
Inventors
- 👤 William E. Horn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:09
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527; C08L; C08L55/00; C08L55/02; C08L69/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
39 words
An aromatic polycarbonate composition containing a minor proportion of at least one phosphorus compound having the structural formula: ##STR5## wherein R is alkyl of 1-8 carbon atoms or aryl of 6-20 carbon atoms and n is 0 or 1.
Claim 2
Dependent Claim
39 words
An aromatic polycarbonate composition containing a minor proportion of at least one phosphorus compound having the structural formula: ##STR5## wherein R is alkyl of 1-8 carbon atoms or aryl of 6-20 carbon atoms and n is 0 or 1.
Claim 3
Dependent Claim
11 words
The aromatic polycarbonate composition of claim 1 wherein n is 0.
Claim 4
Dependent Claim
11 words
The aromatic polycarbonate composition of claim 1 wherein n is 1.
Claim 5
Dependent Claim
11 words
The aromatic polycarbonate composition of claim 1 wherein R is methyl.
Claim 6
Dependent Claim
11 words
The aromatic polycarbonate composition of claim 1 wherein R is phenyl.
Claim 7
Dependent Claim
23 words
The aromatic polycarbonate composition of claim 1 wherein the aromatic polycarbonate is an aromatic polycarbonate of a dihydric phenol and a carbonate precursor.
Claim 8
Dependent Claim
19 words
The aromatic polycarbonate composition of claim 1 wherein the aromatic polycarbonate is a carbonic acid polyester of an alkylidenediphenol.
Claim 9
Dependent Claim
52 words
An aromatic polycarbonate composition containing minor proportions of each of (a) a phosphorus compound having the structural formula: ##STR6## where R is alkyl of 1-8 carbon atoms or aryl of 6-20 carbon atoms and n is 0 or 1, and (b) a halogenated organic compound containing at least about 30% of halogen.
Claim 10
Dependent Claim
52 words
An aromatic polycarbonate composition containing minor proportions of each of (a) a phosphorus compound having the structural formula: ##STR6## where R is alkyl of 1-8 carbon atoms or aryl of 6-20 carbon atoms and n is 0 or 1, and (b) a halogenated organic compound containing at least about 30% of halogen.
Claim 11
Dependent Claim
19 words
The aromatic polycarbonate composition of claim 8 wherein the halogenated organic compound contains at least about 50% of halogen.
Claim 12
Dependent Claim
18 words
The aromatic polycarbonate composition of claim 8 wherein the halogenated organic compound is a chlorinated and/or brominated compound.
Claim 13
Dependent Claim
13 words
The aromatic polycarbonate composition of claim 8 wherein R is methyl or phenyl.
Claim 14
Dependent Claim
20 words
The aromatic polycarbonate composition of claim 1 wherein the aromatic polycarbonate is a polycarbonate of a mixture of polyhydric phenols.
Claim 15
Dependent Claim
16 words
The aromatic polycarbonate composition of claim 1 wherein two or more such phosphorus compounds are present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |