US3960811A
Expired / Lapsed
US
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Process for the preparation of an amorphous polyphenylene oxide
Assignee: General Electric Co
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Filing: 1970-08-19
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Granted: 1976-06-01
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Expires: 1990-08-19
Abstract
Abstract Amorphous polyphenylne oxide resins and polyphenylene oxide resins with lower degrees of crystallinity are prepared by adding a solution thereof to an antisolvent. The resins have from about 0 to 75 percent of the crystallinity of conventional polyphenylene oxide resins and provide compositions, e.g., with styrene resins, having maximum physical properties after a single extrusion.
Inventors
- 👤 James G. Bennett
- 👤 Glenn D. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:51
CPC Classifications
C; C08; C08J; C08J3/00; C08G; C08G65/00; C08G65/34; C08G65/46; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; C08J2371/00; C08J2371/08; C08J2371/10; C08J2371/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A process for the preparation of a completely amorphous polyphenylene oxide having a degree of polymerization of at least 100 from a polyphenylene oxide with 30 to 40% crystallinity which comprises providing a solution of said polyphenylene oxide with 30 to 40% crystallinity in toluene and adding said solution to methanol until the precipitation of said amorphous polyphenylene oxide is substantially complete and recovering said amorphous polyphenylene oxide.
Claim 2
Dependent Claim
68 words
A process for the preparation of a completely amorphous polyphenylene oxide having a degree of polymerization of at least 100 from a polyphenylene oxide with 30 to 40% crystallinity which comprises providing a solution of said polyphenylene oxide with 30 to 40% crystallinity in toluene and adding said solution to methanol until the precipitation of said amorphous polyphenylene oxide is substantially complete and recovering said amorphous polyphenylene oxide.
Claim 3
Dependent Claim
122 words
A process as defined in claim 1 wherein said polyphenylene oxide is of the formula ##SPC4## wherein the oxygen ether atom of one unit is connected to the benzene nucleus of the next repeating unit, n is a positive integer and is at least 100 and each R 1 is a monovalent substituent selected from hydrogen, halogen, hydrocarbon radicals free of a tertiary alpha-carbon atom, halohydrocarbon radicals having at least two carbon atoms between the halogen atom and phenyl nucleus and being free of a tertiary alpha-carbon atom, hydrocarbonoxy radicals being free of a tertiary alpha-carbon atom, and halohydrocarbonoxy radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus and being free of a tertiary alpha-carbon atom.
Claim 4
Dependent Claim
41 words
A process as defined in claim 1 wherein said polyphenylene oxide is of the formula ##SPC5## wherein each R 2 is alkyl of from about 1 to about 4 carbon atoms, and n is a whole integer of at least 100.
Claim 5
Dependent Claim
14 words
A process as defined in claim 2 wherein said polyphenylene oxide is poly(2,6-dimethyl-1,4-phenylene oxide).
Claim 6
Dependent Claim
68 words
A process for the preparation of a completely amorphous polyphenylene oxide having a degree of polymerization of at least 100 from a polyphenylene oxide with 30 to 40% crystallinity which comprises providing a solution of said polyphenylene oxide with 30 to 40% crystallinity in chloroform and adding said solution to methanol until the precipitation of said amorphous polyphenylene oxide is substantially complete and recovering said amorphous polyphenylene oxide.
Claim 7
Dependent Claim
68 words
A process for the preparation of a completely amorphous polyphenylene oxide having a degree of polymerization of at least 100 from a polyphenylene oxide with 30 to 40% crystallinity which comprises providing a solution of said polyphenylene oxide with 30 to 40% crystallinity in chloroform and adding said solution to methanol until the precipitation of said amorphous polyphenylene oxide is substantially complete and recovering said amorphous polyphenylene oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |