US4136087A
Expired / Lapsed
US
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Method for making aromatic cyclic polyformals
Assignee: General Electric Co
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Filing: 1978-05-15
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Granted: 1979-01-23
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Expires: 1998-05-15
Abstract
Abstract A method is provided for making aromatic cyclic polyformals by effecting reaction between a methylene halide and an anhydrous bisphenol dianion, followed by a precipitation and an extraction of the resulting aromatic polyformal reaction product. The aromatic cyclic polyformals can be used as plasticizers for organic polymers for making wire coating formulations.
Inventors
- 👤 Frank J. Williams, III
- 👤 Paul E. Donahue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:51
CPC Classifications
C; C07; C07D; C07D323/00; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4081; C08G2650/00; C08G2650/28; C08G2650/38; C08G2650/44
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A method for making aromatic cyclic polyformal which comprises, (1) stirring a mixture at a temperature of from 25° C. to 80° C. comprising (a) methylene halide and (b) the anhydrous bisphenol dianion formed by refluxing and azeotroping a mixture of an alkali metal hydroxide, and a bisphenol, in the presence of a mixture of a dipolar aprotic solvent and an aromatic hydrocarbon azeotroping solvent, where there is used from 1 to 100 moles of methylene halide, per mole of bisphenol dianion and (2) adding the resulting mixture of (1) to a precipitating solvent, (3) recovering aromatic polyformal from (2) and (4) thereafter extracting with a dialkyl ketone aromatic cyclic polyformal from the aromatic polyformal of (3).
Claim 2
Independent Claim
117 words
A method for making aromatic cyclic polyformal which comprises, (1) stirring a mixture at a temperature of from 25° C. to 80° C. comprising (a) methylene halide and (b) the anhydrous bisphenol dianion formed by refluxing and azeotroping a mixture of an alkali metal hydroxide, and a bisphenol, in the presence of a mixture of a dipolar aprotic solvent and an aromatic hydrocarbon azeotroping solvent, where there is used from 1 to 100 moles of methylene halide, per mole of bisphenol dianion and (2) adding the resulting mixture of (1) to a precipitating solvent, (3) recovering aromatic polyformal from (2) and (4) thereafter extracting with a dialkyl ketone aromatic cyclic polyformal from the aromatic polyformal of (3).
Claim 3
Dependent Claim
10 words
The method of claim 1, where the bisphenol is 2,2-bis(4-hydroxyphenyl)propane.
Claim 4
Dependent Claim
12 words
The method of claim 1, where the aromatic hydrocarbon solvent is toluene.
Claim 5
Dependent Claim
12 words
The method of claim 1, where the dipolar aprotic solvent is dimethylsulfoxide.
Claim 6
Dependent Claim
13 words
The method of claim 1, where the alkali metal hydroxide is sodium hydroxide.
Claim 7
Dependent Claim
11 words
The method of claim 1, where the bisphenol is 4,4'-dihydroxydiphenyl ether.
References Cited (Backward Citations)
US3069386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |