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US4200727A
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Manufacture of polyethers from bisphenols and dihalides in the absence of solvent and in the presence of alkali metal carbonate
Assignee: BASF SE
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Filing: 1978-10-19
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Granted: 1980-04-29
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Expires: 1998-10-19
Abstract
Abstract Polyethers are manufactured by polycondensing about equivalent amounts of a bisphenol and of a dihalogen compound in the presence of an anhydrous alkali metal carbonate, in the absence of a solvent or diluent. The polyethers may be used for the manufacture of moldings, fibers, films, adhesives and coating compositions.
Inventors
- 👤 Gerd Blinne
- 👤 Claus Cordes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:31
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A process for the manufacture of a polyether by polycondensing substantially equivalent amounts of a bisphenol or of a mixture of several bisphenols and of a dihalobenzene compound or a mixture of several dihalobenzene compounds in the presence of from 1.0 to 2.2 moles of an anhydrous alkali metal carbonate, wherein the polycondensation is carried out in the melt, in the absence of a solvent or diluent at a temperature of from 200° to 400° C.
Claim 2
Dependent Claim
76 words
A process for the manufacture of a polyether by polycondensing substantially equivalent amounts of a bisphenol or of a mixture of several bisphenols and of a dihalobenzene compound or a mixture of several dihalobenzene compounds in the presence of from 1.0 to 2.2 moles of an anhydrous alkali metal carbonate, wherein the polycondensation is carried out in the melt, in the absence of a solvent or diluent at a temperature of from 200° to 400° C.
Claim 3
Dependent Claim
45 words
The process of claim 1, wherein the bisphenol used is a compound of the formula ##STR3## where A is a divalent radical selected from the group comprising --C(CH 3 ) 2 --, --SO 2 -- and --CO-- and n and m are 0 or 1.
Claim 4
Dependent Claim
42 words
The process of claim 1, wherein the dihalobenzene compounds is a compound of one of the formulae ##STR4## where Y is --F or --Cl, X is --CO-- or --SO 2 --, D is --O-- or --S-- and r is 0 or 1.
Claim 5
Dependent Claim
16 words
The process of claim 1, wherein potassium carbonate is used as the anhydrous alkali metal carbonate.
Claim 6
Dependent Claim
20 words
The process of claim 1, wherein from 1.1 to 2.0 moles of anhydrous potassium carbonate is used in the process.
Claim 7
Dependent Claim
20 words
The process of claim 5, wherein the polycondensation is carried out at a temperature of from 250° to 350° C.
References Cited (Backward Citations)
US4105636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |