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US4806602A
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Anhydride capping polyphenylene ether with carboxylic acid
Assignee: General Electric Co
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Filing: 1988-03-21
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Granted: 1989-02-21
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Expires: 2008-03-21
Abstract
Abstract Polyphenylene ethers are capped by reaction at a temperature in the range of about 175°-350° C. with at least one carboxylic acid anhydride in the presence of a catalytic amount of at least one highly basic and/or nucleophilic amine. The capping reaction advantageously takes place in the melt. Blends of polyphenylene ethers with polystyrenes may also be capped.
Inventors
- 👤 Dwain M. White
- 👤 Laura A. Socha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
78 words
A method for capping a polyphenylene ether which comprises contacting said polyphenylene ether with at least one carboxylic acid anhydride at a temperature in the range of about 175°-350° C. in the presence of a catalytic amount of at least one tertiary amine having a boiling point of at least about 180° C., the basic nitrogen atoms in said tertiary amine being directly bonded to at least two alkyl groups or being part of a six-membered aromatic ring.
Claim 2
Independent Claim
78 words
A method for capping a polyphenylene ether which comprises contacting said polyphenylene ether with at least one carboxylic acid anhydride at a temperature in the range of about 175°-350° C. in the presence of a catalytic amount of at least one tertiary amine having a boiling point of at least about 180° C., the basic nitrogen atoms in said tertiary amine being directly bonded to at least two alkyl groups or being part of a six-membered aromatic ring.
Claim 3
Dependent Claim
80 words
A method according to claim 1 wherein the polyphenylene ether comprises a plurality of structural units having the formula ##STR7## and in each of said units independently, each Q 1 is independently halogen, primary or secondary lower alkyl, phenyl, haloalkyl, aminoalkyl, hydrocarbonoxy, or halohydrocarbonoxy wherein at least two carbon atoms separate the halogen and oxygen atoms; and each Q 2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy as defined for Q 1 .
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein about 2.5-10% by weight of said anhydride is employed, based on polyphenylene ether.
Claim 5
Dependent Claim
18 words
A method according to claim 3 wherein each Q 1 is methyl and each Q 2 is hydrogen.
Claim 6
Dependent Claim
16 words
A method according to claim 4 wherein the anhydride is acetic, benzoic, isatoic or succinic anhydride.
Claim 7
Dependent Claim
22 words
A method according to claim 5 wherein contact is effected in the melt at a temperature of at least about 225° C.
Claim 8
Dependent Claim
23 words
A method according to claim 5 wherein the amine is N,N'-di-t-butylethylenediamine, 1,4-diaza[2.2.2]bicyclooctane or a substituted pyridine in which the substituents are electron-releasing groups.
Claim 9
Dependent Claim
11 words
A method according to claim 7 wherein the amine is N,N'-di-t-butylethylenediamine.
Claim 10
Dependent Claim
11 words
A method according to claim 7 wherein the amine is 1,4-diaza[2.2.2]bicyclooctane.
Claim 11
Dependent Claim
11 words
A method according to claim 7 wherein the amine is 2-hydroxypyridine.
Claim 12
Dependent Claim
11 words
A method according to claim 7 wherein the amine is 4-dimethylaminopyridine.
Claim 13
Dependent Claim
15 words
A method according to claim 4 wherein there is also present at least one polystyrene.
Claim 14
Dependent Claim
18 words
A method according to claim 12 wherein each Q 1 is methyl and each Q 2 is hydrogen.
Claim 15
Dependent Claim
16 words
A method according to claim 13 wherein the anhydride is acetic, benzoic, isatoic or succinic anhydride.
Claim 16
Dependent Claim
22 words
A method according to claim 14 wherein contact is effected in the melt at a temperature of at least about 225° C.
Claim 17
Dependent Claim
23 words
A method according to claim 14 wherein the amine is N,N'-di-t-butylethylenediamine, 1,4-diaza[2.2.2]bicyclooctane or a substituted pyridine in which the substituents are electron-releasing groups.
Claim 18
Dependent Claim
11 words
A method according to claim 16 wherein the amine is N,N'-di-t-butylethylenediamine.
Claim 19
Dependent Claim
11 words
A method according to claim 16 wherein the amine is 1,4-diaza[2.2.2]bicyclooctane.
Claim 20
Dependent Claim
11 words
A method according to claim 16 wherein the amine is 2-hydroxypyridine.
Claim 21
Dependent Claim
11 words
A method according to claim 16 wherein the amine is 4-dimethylaminopyridine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |