US4808671A
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Catalytic method of preparing carboxy derivatives of polyphenylene ethers
Assignee: SABIC Global Technologies BV
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Filing: 1988-04-21
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Granted: 1989-02-28
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Expires: 2008-04-21
Abstract
Abstract Carboxylated polyphenylene ethers are prepared by reaction of the polyphenylene ether with an ester such as a 4-alkyl or 4-aryl ester of trimellitic anhydride. The methyl, ethyl and o-carbophenoxyphenyl esters are preferred; the latter caps the polyphenylene ether in addition to carboxylating it. The reaction takes place in the presence of a triaryl phosphite, at a temperature in the range of about 225°-350° C.
Inventors
- 👤 Timothy M. Sivavec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:57
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
93 words
A method for preparing a carboxy derivative of a polyphenylene ether which comprises contacting said polyphenylene ether at a temperature in the range of about 225°-350° C. with at least one ester of the formula ##STR7## wherein R 1 is an alkyl or fluoroalkyl radical containing about 1-6 carbon atoms or an unsubstituted or substituted aryl radical containing about 6-10 carbon atoms and R 2 is an organic radical containing at least one additional carboxylic acid ester or anhydride group, in the presence of a catalytic amount of at least one triaryl phosphite.
Claim 2
Independent Claim
93 words
A method for preparing a carboxy derivative of a polyphenylene ether which comprises contacting said polyphenylene ether at a temperature in the range of about 225°-350° C. with at least one ester of the formula ##STR7## wherein R 1 is an alkyl or fluoroalkyl radical containing about 1-6 carbon atoms or an unsubstituted or substituted aryl radical containing about 6-10 carbon atoms and R 2 is an organic radical containing at least one additional carboxylic acid ester or anhydride group, in the presence of a catalytic amount of at least one triaryl phosphite.
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 ##STR8## 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
11 words
A method according to claim 2 wherein melt conditions are employed.
Claim 5
Dependent Claim
12 words
A method according to claim 3 wherein an inert atmosphere is employed.
Claim 6
Dependent Claim
20 words
A method according to claim 4 wherein about 5-10% by weight of said ester is employed, based on polyphenylene ether.
Claim 7
Dependent Claim
21 words
A method according to claim 5 wherein about 0.5-2.0% by weight of said triaryl phosphite is employed, based on polyphenylene ether.
Claim 8
Dependent Claim
13 words
A method according to claim 6 wherein the triaryl phosphite is triphenyl phosphite.
Claim 9
Dependent Claim
13 words
A method according to claim 6 wherein R 2 is an aromatic radical.
Claim 10
Dependent Claim
14 words
A method according to claim 8 wherein R 2 contains an internal anhydride moiety.
Claim 11
Dependent Claim
13 words
A method according to claim 9 wherein the ester has the formula ##STR9##
Claim 12
Dependent Claim
23 words
A method according to claim 10 wherein R 1 is an alkyl radical or an aryl radical containing one or more electron-withdrawing substituents.
Claim 13
Dependent Claim
14 words
A method according to claim 11 wherein R 1 is methyl, ethyl or o-carbophenoxyphenyl.
Claim 14
Dependent Claim
17 words
A method according to claim 12 wherein the temperature is in the range of about 275°-325° C.
Claim 15
Dependent Claim
18 words
A method according to claim 13 wherein each Q 1 is methyl and each Q 2 is hydrogen.
Claim 16
Dependent Claim
13 words
A method according to claim 14 wherein the triaryl phosphite is triphenyl phosphite.
Claim 17
Dependent Claim
20 words
A method according to claim 15 wherein about 6-8% by weight of said ester is employed, based on polyphenylene ether.
Claim 18
Dependent Claim
11 words
A method according to claim 16 wherein R 1 is methyl.
Claim 19
Dependent Claim
11 words
A method according to claim 16 wherein R 1 is ethyl.
Claim 20
Dependent Claim
11 words
A method according to claim 16 wherein R 1 is o-carbophenoxyphenyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |