US3923738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the formation of polyphenylene ethers of controlled particle size
Assignee: General Electric Co
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Filing: 1974-07-23
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Granted: 1975-12-02
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Expires: 1994-07-23
Abstract
Abstract Polyphenylene ether resins with narrow particle size distribution, higher bulk density, and of substantially lower content of dusty, fine particles are obtained by precipitation from their solution in an organic aromatic solvent with a nonsolvent medium which is capable of forming a two-phase system with the aromatic solvent. In especially preferred embodiments, the polyphenylene ethers assume spheroidal shape during precipitation. The improved form of polyphenylene ethers facilitates bagging, transfer and compounding, and improves the appearance and physical properties of articles molded therefrom.
Inventors
- 👤 Sorge Bernardus J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:25
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/46
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
118 words
IN A PROCESS FOR RECEIVING A POLYPHENYLENE ETHER FROM A SOLUTION THEREOF IN AN AROMATIC SOLVENT BY MIXING SAID SOLUTION WITH A NON-SOLVENT FOR SAID POLYPHENYLENE ETHER IN AN AMOUNT SUFFICIENT TO CAUSE SEPARATION OF THE POLYPHENYLENE ETHER THEREFROM, THE IMPROVEMENT WHICH COMPRISES USING AS SAID NON-SOLVENT A MEDIUM SELECTED FROM THE GROUP CONSISTING OF (I) WATER AND A (LOWER) ALKYL ALCOHOL, (II) WATER AND A (LOWER) ALKYL KETONE, AND (III) WATER AND A MIXTURE OF A (LOWER) ALKYL ALCOHOL AND A (LOWER) ALKYL KETONE WHICH IS ALSO CAPABLE OF FORMING A TWO-PHASE SYSTEM WITH THE AROMATIC SOLVENT AND AN AROMATIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, THE XYLENES, ETHYLTOLUENE, CHLOROBENZENE, DICHLOROBENZENE, NITROBENZENE AND BROMOBENZENE.
Claim 2
Dependent Claim
118 words
IN A PROCESS FOR RECEIVING A POLYPHENYLENE ETHER FROM A SOLUTION THEREOF IN AN AROMATIC SOLVENT BY MIXING SAID SOLUTION WITH A NON-SOLVENT FOR SAID POLYPHENYLENE ETHER IN AN AMOUNT SUFFICIENT TO CAUSE SEPARATION OF THE POLYPHENYLENE ETHER THEREFROM, THE IMPROVEMENT WHICH COMPRISES USING AS SAID NON-SOLVENT A MEDIUM SELECTED FROM THE GROUP CONSISTING OF (I) WATER AND A (LOWER) ALKYL ALCOHOL, (II) WATER AND A (LOWER) ALKYL KETONE, AND (III) WATER AND A MIXTURE OF A (LOWER) ALKYL ALCOHOL AND A (LOWER) ALKYL KETONE WHICH IS ALSO CAPABLE OF FORMING A TWO-PHASE SYSTEM WITH THE AROMATIC SOLVENT AND AN AROMATIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, THE XYLENES, ETHYLTOLUENE, CHLOROBENZENE, DICHLOROBENZENE, NITROBENZENE AND BROMOBENZENE.
Claim 3
Dependent Claim
51 words
A process as defined in claim 1 wherein said solvent is an aromatic solvent and said non-solvent comprises a (lower)alkyl alcohol and water or a (lower)alkyl ketone and water, said water being present in an amount sufficient to cause said mixture of non-solvent and solvent to separate into two immiscible mixtures.
Claim 4
Dependent Claim
16 words
A process as defined in claim 2 wherein said aromatic solvent is benzene, toluene or xylene.
Claim 5
Dependent Claim
22 words
A process as defined in claim 2 wherein said (lower)alkyl alcohol is methanol, ethanol or isopropanol and said (lower)alkyl ketone is acetone.
Claim 6
Dependent Claim
38 words
A process as defined in claim 3 wherein said organic solvent is toluene and said non-solvent comprises from about 80 to about 95% by weight of methanol and from about 5 to about 20% by weight of water.
Claim 7
Dependent Claim
28 words
A process as defined in claim 3 wherein said nonsolvent comprises methanol and water in a weight ratio of from 1:5 to 1: 20 of water to methanol.
Claim 8
Dependent Claim
13 words
A process as defined in claim 6 wherein said aromatic solvent is toluene.
Claim 9
Dependent Claim
15 words
A process as defined in claim 1 wherein said polyphenylene ether is of the formula:
Claim 10
Dependent Claim
21 words
A process as defined in claim 8 wherein each Q is an alkyl group having from 1 to 6 carbon atoms.
Claim 11
Dependent Claim
14 words
A process as defined in claim 9 wherein each Q is a methyL group.
Claim 12
Dependent Claim
84 words
In a process for recovering a polyphenylene ether from a solution thereof in an aromatic solvent by mixing said solution with a non-solvent for said polyphenylene ether in an amount sufficient to cause the separation of the polyphenylene ether therefrom, the improvement which comprises using a said aromatic solvent benzene, toluene or xylene and as said non-solvent a mixture of a (lower)alkyl alcohol and water or a (lower)alkyl ketone and water, said mixture being capable of forming a twophase system with the aromatic solvent.
Claim 13
Dependent Claim
84 words
In a process for recovering a polyphenylene ether from a solution thereof in an aromatic solvent by mixing said solution with a non-solvent for said polyphenylene ether in an amount sufficient to cause the separation of the polyphenylene ether therefrom, the improvement which comprises using a said aromatic solvent benzene, toluene or xylene and as said non-solvent a mixture of a (lower)alkyl alcohol and water or a (lower)alkyl ketone and water, said mixture being capable of forming a twophase system with the aromatic solvent.
Claim 14
Dependent Claim
67 words
A process as defined in claim 11 wherein a first phase consists substantially of said (lower)alkyl alcohol or said (lower)alkyl ketone and water with a relatively small amount of said aromatic solvent, and a second phase consists substantially of said aromatic solvent and said polyphenylene ether, and includes only a small amount of water and a relatively small amount of said (lower)alkyl alcohol or said (lower)alkyl ketone.
Claim 15
Dependent Claim
19 words
A process as defined in claim 11 wherein said aromatic solvent is toluene and said (lower)alkyl alcohol is methanol.
Claim 16
Dependent Claim
19 words
A process as defined in claim 12 wherein said aromatic solvent is toluene and said (lower)alkyl alcohol is methanol.
Claim 17
Dependent Claim
15 words
A process as defined in claim 11 wherein said polyphenylene ether is of the formula:
Claim 18
Dependent Claim
21 words
A process as defined in claim 15 wherein each Q is an alkyl group having from 1 to 6 carbon atoms.
Claim 19
Dependent Claim
14 words
A process as defined in claim 16 wherein said Q is a methyl group.
Claim 20
Dependent Claim
32 words
A process as defined in claim 11 wherein said non-solvent comprises from about 80 to about 95% by weight of methanol and from about 5 to about 20% by weight of water.
Claim 21
Dependent Claim
28 words
A process as defined in claim 11 wherein said non-solvent comprises methanol and water in a weight ratio of from 1:5 to 1: 20 of water to methanol.
Claim 22
Dependent Claim
13 words
A process as defined in claim 19 wherein said aromatic solvent is toluene.
References Cited (Backward Citations)
US3789054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |