US4188475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of flame-retardant polycarbonates
Assignee: Bayer AG
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Filing: 1978-06-30
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Granted: 1980-02-12
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Expires: 1998-06-30
Abstract
Abstract The present invention relates to the preparation of aromatic polycarbonates, by the two-phase interface process, from diphenols, preferably from halogen-free diphenols, characterized in that aromatic monosulphonic acid chlorides are used as chain stoppers in amounts of about 2 mol % to 20 mol %, preferably in amounts of about 2.5 mol % to 10 mol %, relative to mols of the diphenols employed. In addition, the present invention relates to the aromatic polycarbonates obtainable by the process according to the invention.
Inventors
- 👤 Dieter Margotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:23
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
In a process for the preparation of an aromatic polycarbonate from diphenols by a two-phase interface process, the improvement wherein an aromatic monosulphonic acid chloride is used as a chain stopper in an amount of from about 2 mol % to 20 mol %, relative to the number of mols of diphenol.
Claim 2
Dependent Claim
52 words
In a process for the preparation of an aromatic polycarbonate from diphenols by a two-phase interface process, the improvement wherein an aromatic monosulphonic acid chloride is used as a chain stopper in an amount of from about 2 mol % to 20 mol %, relative to the number of mols of diphenol.
Claim 3
Dependent Claim
24 words
The process according to claim 1 wherein the amount of aromatic monosulphonic acid chloride is from about 2.5 mol % to 10 mol %.
Claim 4
Dependent Claim
12 words
The process according to claim 1 wherein the diphenols are halogen free.
Claim 5
Dependent Claim
35 words
The process according to claim 1 wherein the aromatic monosulphonic acid chloride has the general formula ##STR4## wherein R 1 to R 5 are identical or different and are H, alkyl, cycloalkyl, aryl or halogen.
Claim 6
Dependent Claim
42 words
The process according to claim 4 wherein the alkyl group has from 1 to 4 carbon atoms, the cycloalkyl group has 5 or 6 carbon atoms, the aryl group has 6 to 16 carbon atoms, and the halogen is chlorine or bromine.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the aromatic polycarbonate has a weight-average molecular weight of from about 10,000 to 100,000.
Claim 8
Dependent Claim
103 words
An aromatic polycarbonate characterized by the general structural formula ##STR5## wherein E and E 1 are the same or different and are radicals of the formula II ##STR6## wherein R 1 to R 5 are identical or different and are H, C 1 -C 4 -alkyl, C 5 -C 6 -cycloalkyl, C 6 -C 16 - aryl or halogen, and wherein Z represents a divalent aromatic radical derived from a compound of the formula III HO--Z--OH (III), and n is the degree of polymerization which results from a weight average molecular weight, Mw, of the aromatic polycarbonate of from about 10,000 to 100,000.
Claim 9
Dependent Claim
103 words
An aromatic polycarbonate characterized by the general structural formula ##STR5## wherein E and E 1 are the same or different and are radicals of the formula II ##STR6## wherein R 1 to R 5 are identical or different and are H, C 1 -C 4 -alkyl, C 5 -C 6 -cycloalkyl, C 6 -C 16 - aryl or halogen, and wherein Z represents a divalent aromatic radical derived from a compound of the formula III HO--Z--OH (III), and n is the degree of polymerization which results from a weight average molecular weight, Mw, of the aromatic polycarbonate of from about 10,000 to 100,000.
Claim 10
Dependent Claim
33 words
The aromatic polycarbonate of claim 7 wherein the aromatic sulfonyl radical of formula II is present in from about 2 to 20 mol % relative to the mols of divalent aromatic radical Z.
References Cited (Backward Citations)
FR1311130A
Cited
US3177179A
Cited
US3240756A
Cited
US3398120A
Cited
US3933734A
Cited
US4020045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |