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US4594375A
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Bis-(imide-sulfonate) flameproofing agents, their preparation and their use for flameproofing in polycarbonate
Assignee: Bayer AG
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Filing: 1984-06-04
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Granted: 1986-06-10
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Expires: 2004-06-04
Abstract
Abstract The present invention relates to novel bis-(imide-sulphonates) of the formula (I), a process for their preparation, their use for flameproofing aromatic, thermoplastic polycarbonates obtained from halogen-free diphenols, and thermoplastic aromatic polycarbonates obtained from halogen-free diphenols and containing 0.01 to 1% by weight, of bis-(imide-sulphonate) of the formula (I), based on an aromatic, thermoplastic polycarbonate.
Inventors
- 👤 Sivaram Krishnan
- 👤 Klaus Kircher
- 👤 Hans-Jurgen Kress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:05
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
Bis-(imide-sulphonates) of the general formula ##STR5## wherein Y and Y' independently of one another represent an alkyl radical with 1 to 4 carbon atoms, a is 0, 1, 2, 3 or 4, T is 0 or 1 and M is an alkali metal.
Claim 2
Dependent Claim
43 words
Bis-(imide-sulphonates) of the general formula ##STR5## wherein Y and Y' independently of one another represent an alkyl radical with 1 to 4 carbon atoms, a is 0, 1, 2, 3 or 4, T is 0 or 1 and M is an alkali metal.
Claim 3
Dependent Claim
13 words
A compound according to claim 1 in which M is sodium or potassium.
Claim 4
Dependent Claim
87 words
A process for the production of a compound according to claim 1 in which benzene-1,2,4,5-tetracarboxylic acid bis-anhydride is reacted with an aminosulphonic acid of the general formula ##STR6## wherein Y, a and T have the same meanings as in claim 1, in a molar ratio of bis-anhydride to aminosulphonic acid of 1:2 at a temperature of 130° C. to 150° C., in a solvent in the presence of an equivalent amount of alkali metal carbonate, based on the particular amount of aminosulphonic acid of the formula (II).
Claim 5
Dependent Claim
12 words
A process according to claim 3 in which the solvent is dimethylformamide.
Claim 6
Dependent Claim
18 words
A process according to claim 3, in which the alkali metal carbonate is sodium carbonate or potassium carbonate.
Claim 7
Dependent Claim
67 words
A process of using the bis-(imidesulphonate) of claim 1 for flameproofing an aromatic, thermoplastic polycarbonate obtained from halogen-free diphenols comprising incorporating said bis-(imide-sulphonate) into the aromatic, thermoplastic polycarbonates, in an amount of 0.01 to 1% by weight, based on the aromatic, thermoplastic polycarbonate, via a twin-screw extruder, a temperature of 270°-280° C. and a throughput of 18 kg/hour at a rotation speed of 40-80 revolutions/minute being maintained.
Claim 8
Dependent Claim
26 words
A process according to claim 6, in which the incorporation of the bis-(imide-sulphonate) into the polycarbonate is carried out in the presence of another flameproofing additive.
Claim 9
Dependent Claim
27 words
A process according to claim 6, in which the bis-(imide-sulphonate) is incorporated in an amount of 0.1 to 0.75% by weight, based on the aromatic, thermoplastic polycarbonate.
Claim 10
Dependent Claim
32 words
A thermoplastic composition comprising an aromatic polycarbonate which is obtained from halogen-free diphenols and 0.01 to 1% by weight, based on the aromatic, thermoplastic polycarbonate, of a bis-(imide-sulphonate) according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |