Patent US4231920A successfully refreshed from Google Patents.
US4231920A
Expired / Lapsed
US
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Transparent to translucent flame-retardant polycarbonate composition
Assignee: General Electric Co
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Filing: 1979-01-25
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Granted: 1980-11-04
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Expires: 1999-01-25
Abstract
Abstract A transparent to translucent flame-retardant polycarbonate composition comprising a mixture of an aromatic carbonate polymer and a flame-retardant additive which can be the metal salts of organic sulfonic acids and a coadditive which can be a solvent for said metal salts.
Inventors
- 👤 Victor Mark
- 👤 Charles V. Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:59
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; C08L; C08L25/00; C08L25/18; C08L69/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A transparent to translucent and flame retardant polycarbonate composition comprising a mixture of a high molecular weight aromatic polycarbonate; a minor amount of a flame retardant salt selected from the group consisting of organic alkali or organic alkaline earth metal salts of sulfonic acids or mixtures thereof; and, a minor amount of a coadditive solvent selected from the group consisting of water, organic protic compounds or organic aprotic compounds, or mixtures thereof.
Claim 2
Dependent Claim
72 words
A transparent to translucent and flame retardant polycarbonate composition comprising a mixture of a high molecular weight aromatic polycarbonate; a minor amount of a flame retardant salt selected from the group consisting of organic alkali or organic alkaline earth metal salts of sulfonic acids or mixtures thereof; and, a minor amount of a coadditive solvent selected from the group consisting of water, organic protic compounds or organic aprotic compounds, or mixtures thereof.
Claim 3
Dependent Claim
16 words
The composition of claim 1 in which the aromatic carbonate is the reaction product of 2,2-bis(4-hydroxyphenyl)propane.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the flame retardant salt is sodium trichlorobiphenyl sulfonate.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein the flame retardant salt is sodium 1,1-dichloro-2,2-diphenylethylene sulfonate.
Claim 6
Dependent Claim
14 words
The composition of claim 1 wherein the flame retardant salt is potassium diphenylsulfone sulfonate.
Claim 7
Dependent Claim
13 words
The composition of claim 1 wherein the flame retardant salt is potassium trifluoromethanesulfonate.
Claim 8
Dependent Claim
136 words
The composition of claim 1 wherein the coadditive solvent is selected from the group comprising C 1 -C 4 alcohols; C 2 -C 6 glycols, triols and polyols; C 1 -C 4 mono- and di-carboxylic acids; C 2 -C 6 hydroxycarboxylic acids; C 1 -C 4 mono- or di-carboxamides; N-methylated-, N,N-dimethylated-, N-hydroxyethylated, N,N-bis(hydroxyethylated) mono- and di-carboxamides, including cyclic C 4 -C 6 carboxamides; C 2 -C 12 dialkyl, alkyl aryl and diaryl sulfoxides; C 2 -C 14 dialkyl, alkyl aryl and diaryl sulfones; substituted diaryl sulfones, wherein the substituents are C 1 -C 6 alkyl, chlorine, bromine and fluorine; cyclic C 4 -C 12 alkyl, alkyl aryl and aryl sulfones; C 1 -C 12 mono- and di-sulfonamides; N-methyl, N,N-dimethyl, N-hydroxyethyl and N,N-bis(hydroxyethyl) C 1 -C 12 mono- and di-sulfonamides; N-polyalkylated and N-poly(hydroxyethylated) phosphoramides; and mixtures thereof.
Claim 9
Dependent Claim
11 words
The composition of claim 7 wherein the coadditive solvent is dimethylformamide.
Claim 10
Dependent Claim
11 words
The composition of claim 7 wherein the coadditive solvent is N-methylpyrrolidone.
Claim 11
Dependent Claim
11 words
The composition of claim 7 wherein the coadditive solvent is tetramethylenesulfone.
Claim 12
Dependent Claim
12 words
The composition of claim 7 wherein the coadditive solvent is ethylene glycol.
Claim 13
Dependent Claim
16 words
The composition of claim 1 wherein the coadditive solvent is a mixture of water and dimethylformamide.
Claim 14
Dependent Claim
30 words
The composition of claim 1 wherein the flame retardant salt and the coadditive solvent each are present in amounts of about 0.01-5.0 parts per hundred parts of the aromatic polycarbonate.
References Cited (Backward Citations)
US3294741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |