US3753770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant compositions containing nitrogen-phosphorous-halogen adducts
Assignee: WR Grace and Co Conn
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Filing: 1971-11-30
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Granted: 1973-08-21
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Expires: 1991-11-30
Abstract
Abstract A process of producing flame resistant layers, which comprises treating cured resins or cured formed resinous bodies with the vapor of phosphorus trichloride and thereafter subjecting the treated resins to the vapors of ammonia. Satisfactory flame resistance is given by concentrations of the halide moiety of between 5 and 20 percent by weight of the resin.
Inventors
- 👤 G Braude
- 👤 E Stahly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:30
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31786; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
The process of producing a flame resistant layer at and adjacent to the surface of a formed resinous body which consists in treating a formed resinous body selected from the class of cured formed polyester bodies, cured formed epoxy resinous bodies, cured formed polyurethane bodies and cured formed polystyrene bodies to the vapors of phosphorus trichloride for a period of about 2 hours, withdrawing the phosPhorus trichloride vapor and then subjecting the treated resinous body to the vapors of ammonia for a period of about 2 hours whereby a flame resistant layer comprising the resin and -5-20 percent of the resin of the adduct of phosphorus trichloride and ammonia is formed on the surface of the body.
Claim 2
Dependent Claim
7 words
The cured resin product of claim 1.
Claim 3
Dependent Claim
7 words
The cured resin product of claim 2.
References Cited (Backward Citations)
US3132045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |