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Patent US4495111A successfully refreshed from Google Patents.
US4495111A
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Hemiesters of phosphonic acids
Assignee: ATO Chimie SA
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Filing: 1983-09-26
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Granted: 1985-01-22
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Expires: 2003-09-26
Abstract
Abstract The invention relates to a fire-resistant synthetic resin composition containing a polycarbonate, more specifically a bisphenol A derivative, a phosphorous fireproofing additive derived from phosphonic acid, and possibly other additives and/or fillers. The fireproofing additive is a Li, Na or K hemiester of a phosphonic acid derived from an aromatic or cycloaliphatic hydrocarbon, or from a polynuclear aromatic compound, and is added at the rate of 0.01 to 0.4 weight % in relation to polycarbonate. This small amount of additive improves the fire-resistant properties of the polycarbonate, without affecting its mechanical properties.
Inventors
- 👤 Bernard Guerin
- 👤 Pierre Poisson
- 👤 Georges Sturtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:44
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A hemiester with the formula ##STR22## where Y 1 is a monovalent radical derived, by the loss of a nuclear hydrogen atom, from a compound selected from the group consisting of benzene, toluene, ethylbenzene, bromobenzene and cyclohexane, R 1 is a methyl or ethyl radical, m is 0 or 1 and M is potassium.
Claim 2
Dependent Claim
54 words
A hemiester with the formula ##STR22## where Y 1 is a monovalent radical derived, by the loss of a nuclear hydrogen atom, from a compound selected from the group consisting of benzene, toluene, ethylbenzene, bromobenzene and cyclohexane, R 1 is a methyl or ethyl radical, m is 0 or 1 and M is potassium.
Claim 3
Dependent Claim
53 words
A hemiester with the formula ##STR23## where Y 2 is a divalent radical derived, by the loss of two hydrogen atoms, each located on a different nucleus, from a compound selected from the group consisting of diphenyl, diphenyloxide, diphenylsulphone and diphenyl-2,2-propane, R 1 is a methyl or ethyl radical and M is potassium.
Claim 4
Dependent Claim
53 words
A hemiester with the formula ##STR23## where Y 2 is a divalent radical derived, by the loss of two hydrogen atoms, each located on a different nucleus, from a compound selected from the group consisting of diphenyl, diphenyloxide, diphenylsulphone and diphenyl-2,2-propane, R 1 is a methyl or ethyl radical and M is potassium.
Claim 5
Dependent Claim
29 words
A hemiester with the formula ##STR24## where m is a number equal to 0 or 1, and R 1 is a methyl or ethyl radical and M is potassium.
Claim 6
Dependent Claim
29 words
A hemiester with the formula ##STR24## where m is a number equal to 0 or 1, and R 1 is a methyl or ethyl radical and M is potassium.
Claim 7
Dependent Claim
29 words
A hemiester with the formula ##STR25## where m is a number equal to 0 or 1, and R 1 is a methyl or ethyl radical and M is potassium.
Claim 8
Dependent Claim
29 words
A hemiester with the formula ##STR25## where m is a number equal to 0 or 1, and R 1 is a methyl or ethyl radical and M is potassium.
Claim 9
Dependent Claim
35 words
A hemiester according to claim 1, selected from the group consisting of ethyl and potassium phenylphosphonate, ethyl and potassium benzylphosphonate, methyl and potassium benzylphosphonates, ethyl and potassium bromo-4 benzylphosphonate and ethyl and potassium cyclohexyl methylphosphonate.
Claim 10
Dependent Claim
14 words
A hemiester according to claim 2, which is a diethyl and dipotassium diphenylene-4,4' diphosphonate.
Claim 11
Dependent Claim
27 words
A hemiester according to claim 3, selected from the group consisting of diethyl and dipotassium paraxylylene diphosphonate, dimethyl and dipotassium paraxylylene diphosphonate, diethyl and dipotassium paraphenylene diphosphonate.
References Cited (Backward Citations)
US3325569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |