US4471104A
Expired / Lapsed
US
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Process for the preparation of polycarbonates having sulfonanilide terminal groups
Assignee: Bayer AG
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Filing: 1982-11-04
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Granted: 1984-09-11
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Expires: 2002-11-04
Abstract
Abstract The present invention relates to the preparation of aromatic polycarbonates by the known two-phase interface process, from diphenols characterized in that aromatic sulfonanilides are used as chain terminators in amounts of about 2 mol % to 20 mol %, preferably in amounts of about 2.5 mol % to 10 mol %, relative to mols of diphenols employed. In addition, the present invention relates to the aromatic polycarbonates obtainable by the process according to the invention. The products of this invention have been found to have better self extinguishing property compared to polycarbonates without sulfonamide end groups.
Inventors
- 👤 Sivaram Krishnan
- 👤 Wolfgang Cohnen
- 👤 Dieter Neuray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:13
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
In the interfacial process for the preparation of an aromatic polycarbonate resin having a weight average molecular weight of between 10,000 and 100,000 as determined from the relative viscosity measured in CH 2 Cl 2 at 25° C. at a concentration of about 0.5% by weight from at least one diphenol and a carbonic acid derivative the improvement comprising coreacting an aromatic sulfonanilide as a chain stopper in an amount of from 2 mol % to 20 mol % relative to the number of mols of said diphenol.
Claim 2
Dependent Claim
88 words
In the interfacial process for the preparation of an aromatic polycarbonate resin having a weight average molecular weight of between 10,000 and 100,000 as determined from the relative viscosity measured in CH 2 Cl 2 at 25° C. at a concentration of about 0.5% by weight from at least one diphenol and a carbonic acid derivative the improvement comprising coreacting an aromatic sulfonanilide as a chain stopper in an amount of from 2 mol % to 20 mol % relative to the number of mols of said diphenol.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the amount of aromatic sulfonanilide is about 2.5 mol % to 10 mol %.
Claim 4
Dependent Claim
12 words
The process according to claim 1, wherein said diphenol is halogen free.
Claim 5
Dependent Claim
18 words
The process according to claim 1 wherein said at least one diphenol comprises at least one halogenated diphenol.
Claim 6
Dependent Claim
12 words
The process according to claim 1 further comprising coreacting a branching agent.
Claim 7
Dependent Claim
35 words
The process according to claim 1, wherein the aromatic sulfonanilide has the general formula (I) ##STR7## wherein R 1 to R 10 are identical or different and are H, alkyl, cycloalkyl, aryl, cyano or halogen.
Claim 8
Dependent Claim
10 words
The aromatic polycarbonate produced by the process according claim 1.
Claim 9
Dependent Claim
106 words
An aromatic polycarbonate prepared by the process of claim 1 and characterized by the general formula (II) ##STR8## wherein E and E' are the same or different and are radicals of formula (III) ##STR9## wherein R 1 to R 10 are identical or different and are H, C 1 -C 18 alkyl, C 5 -C 6 cycloalkyl, C 6 -C 16 aryl, cyano or halogen, wherein Z represents a divalent aromatic diradical derived from a compound of the formula (IV) HO--Z--OH and n is the degree of polymerisation which results from a weight average molecular weight, of the aromatic polycarbonate of from about 10,000 to 100,000.
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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |