US4440944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant epoxy resins containing 3-hydroxyalkylphosphine oxides
Assignee: FMC Corp
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Filing: 1983-02-03
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Granted: 1984-04-03
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Expires: 2003-02-03
Abstract
Abstract Epoxy resins are rendered fire retardant by the addition thereto of a 3-hydroxyalkylphosphine oxide. Other halogen containing flame retardants may or may not be present in the composition. Mixtures containing a brominated epoxide and/or a halogenated phosphine oxide provide a high level of flame retardance at low levels of the additive. The epoxy resins may be heat cured in the presence of an acid anhydride or amine to form a polymer having the phosphine oxide incorporated in the polymer molecule.
Inventors
- 👤 Edward R. Fretz, Jr.
- 👤 Joseph Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:00
CPC Classifications
C; C08; C08L; C08L63/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A flame retardant hardener for epoxy resins comprising the reaction product of an anhydride with a 3-hydroxypropylphosphine oxide having the general formula: ##STR2## wherein R 1 may be the same or a different radical selected from the group consisting of hydrogen, phenyl, hydroxymethyl and alkyl radicals of 1-4 carbon atoms, R 2 may be the same or a different radical selected from the group consisting of hydrogen, hydroxymethyl, and alkyl radicals of 1-4 carbon atoms, R 3 may be the same or a different radical selected from the group consisting of hydrogen and methyl radicals, R 4 is an alkyl radical 2-8 carbon atoms and n is either 0 or 1.
Claim 2
Dependent Claim
111 words
A flame retardant hardener for epoxy resins comprising the reaction product of an anhydride with a 3-hydroxypropylphosphine oxide having the general formula: ##STR2## wherein R 1 may be the same or a different radical selected from the group consisting of hydrogen, phenyl, hydroxymethyl and alkyl radicals of 1-4 carbon atoms, R 2 may be the same or a different radical selected from the group consisting of hydrogen, hydroxymethyl, and alkyl radicals of 1-4 carbon atoms, R 3 may be the same or a different radical selected from the group consisting of hydrogen and methyl radicals, R 4 is an alkyl radical 2-8 carbon atoms and n is either 0 or 1.
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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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |