US3993635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame resistant polystyrene
Assignee: General Electric Co
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Filing: 1974-12-06
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Granted: 1976-11-23
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Expires: 1994-12-06
Abstract
Abstract A flame-resistant, thermoplastic copolymer of styrene and phosphorylated styrene having a phosphorus group bonded to a phenyl group by an intervening methylene group and being substantially non-crosslinked.
Inventors
- 👤 Louis A. Mango, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:42
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A copolymer of styrene and phosphorylated styrene, said copolymer containing phenyl groups and being represented by the formula ##EQU2## where R is an alkyl group having 1-8 carbon atoms of the group consisting of alkyl and at least about 5 wt. pct. phosphorus, said phosphorus being bonded to the phenyl group by an intervening methylene group and said polystyrene copolymer being substantially non-crosslinked.
Claim 2
Dependent Claim
63 words
A copolymer of styrene and phosphorylated styrene, said copolymer containing phenyl groups and being represented by the formula ##EQU2## where R is an alkyl group having 1-8 carbon atoms of the group consisting of alkyl and at least about 5 wt. pct. phosphorus, said phosphorus being bonded to the phenyl group by an intervening methylene group and said polystyrene copolymer being substantially non-crosslinked.
Claim 3
Dependent Claim
27 words
A copolymer, as set forth in claim 1, wherein said phosphorus is present in an amount in the range of about 5 to about 10 wt. pct.
Claim 4
Dependent Claim
12 words
A copolymer, as set forth in claim 1, wherein R is ethyl.
Claim 5
Dependent Claim
12 words
A copolymer, as set forth in claim 1, wherein R is butyl.
Claim 6
Dependent Claim
18 words
A copolymer, as set forth in claim 1, wherein the phosphorus is in the form of a phosphonate.
Claim 7
Dependent Claim
23 words
A copolymer, as set forth in claim 5, wherein the carbon-phosphorus bond of the phosphonate is connecting the phosphorus to the phenyl group.
Claim 8
Dependent Claim
25 words
A copolymer, as set forth in claim 1, including glass fibers in an amount in the range of about 5 to about 50 wt. pct.
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |