Patent US4269762A successfully refreshed from Google Patents.
US4269762A
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Polycarbonate containing a salt of a tetrahydrocarbyl borate as an ignition depressant
Assignee: Dow Chemical Co
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Filing: 1980-04-21
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Granted: 1981-05-26
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Expires: 2000-04-21
Abstract
Abstract A polycarbonate such as a bisphenol-A homopolycarbonate containing a small amount of a salt of a tetrahydrocarbyl borate e.g., sodium tetraphenyl borate, resists combustion upon exposure to a low temperature ignition source.
Inventors
- 👤 Lowell S. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:44
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/55
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A composition comprising a carbonate polymer having dispersed therein a thermally stable salt of a tetrahydrocarbyl borate in an amount sufficient to retard combustion when the composition is exposed to a low temperature ignition source.
Claim 2
Dependent Claim
35 words
A composition comprising a carbonate polymer having dispersed therein a thermally stable salt of a tetrahydrocarbyl borate in an amount sufficient to retard combustion when the composition is exposed to a low temperature ignition source.
Claim 3
Dependent Claim
27 words
The composition of claim 1 wherein the salt is represented by the formula: MBR.sub.4 wherein M is alkali metal; each R 4 is individually aryl or alkyl.
Claim 4
Dependent Claim
17 words
The composition of claim 2 wherein M is Na or K and each R is individually aryl.
Claim 5
Dependent Claim
30 words
The composition of claim 3 wherein the salt is sodium tetraphenyl borate and is present in an amount from about 0.02 to about 0.1 weight percent of the carbonate polymer.
Claim 6
Dependent Claim
14 words
The composition of claim 1 wherein the salt is a tetrahydrocarbyl phosphonium tetrahydrocarbyl borate.
Claim 7
Dependent Claim
13 words
The composition of claim 5 wherein the salt is methyl triphenylphosphonium tetraphenyl borate.
References Cited (Backward Citations)
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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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |