US4988775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dicarboxylate-capped polyphenylene ether with trimellitic acid anhydride salicylate ester
Assignee: General Electric Co
•
Filing: 1990-02-05
•
Granted: 1991-01-29
•
Expires: 2010-02-05
Abstract
Abstract Polyphenylene ethers are capped by reaction in the melt, with application of vacuum, with at least one trimellitic anhydride salicylate ester, preferably the 4-(phenyl salicylate) ester. The preferred melt processing method is extrusion with vacuum venting. By this method, the polyphenylene ether is capped with reactive dicarboxylate groups and also with salicylate groups, improving its thermal stability. The capped polyphenylene ether is capable of forming copolymers with polyamides, and said copolymers are useful as compatibilizers for polyphenylene ether-polyamide blends.
Inventors
- 👤 Timothy M. Sivavec
- 👤 Sharon J. McCormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:16
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/126; C08L77/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
45 words
A dicarboxylate-capped polyphenylene ether composition prepared by melt blending, with application of vacuum, at least one polyphenylene ether with at least one trimellitic acid anhydride salicylate ester of the formula ##STR6## wherein R 1 is C 1-6 alkyl or a C 6-10 aromatic hydrocarbon radical.
Claim 2
Dependent Claim
45 words
A dicarboxylate-capped polyphenylene ether composition prepared by melt blending, with application of vacuum, at least one polyphenylene ether with at least one trimellitic acid anhydride salicylate ester of the formula ##STR6## wherein R 1 is C 1-6 alkyl or a C 6-10 aromatic hydrocarbon radical.
Claim 3
Dependent Claim
14 words
A composition according to claim 1 wherein the polyphenylene ether is a poly(2,6-dimethyl-l,4-phenylene ether).
Claim 4
Dependent Claim
23 words
A composition according to claim 1 wherein the materials blended consist essentially of said polyphenylene ether and said trimellitic acid anhydride salicylate ester.
Claim 5
Dependent Claim
18 words
A composition according to claim 3 wherein the melt processing step is effected by extrusion with vacuum venting.
Claim 6
Dependent Claim
22 words
A composition according to claim 4 wherein the proportion of trimellitic acid anhydride salicylate ester is about 3-5% based on polyphenylene ether.
Claim 7
Dependent Claim
11 words
A composition according to claim 5 wherein R 1 is phenyl.
Claim 8
Dependent Claim
26 words
A composition according to claim 3 wherein the polyphenylene ether has been melt processed under vacuum prior to reaction with said trimellitic acid anhydride salicylate ester.
Claim 9
Dependent Claim
18 words
A composition according to claim 7 wherein the melt processing steps are effected by extrusion with vacuum venting.
Claim 10
Dependent Claim
21 words
A composition according to claim 8 wherein about 3-5% of trimellitic acid anhydride salicylate ester is blended, based on polyphenylene ether.
Claim 11
Dependent Claim
11 words
A composition according to claim 9 wherein R 1 is phenyl.
Claim 12
Dependent Claim
19 words
A composition according to claim 3 which has again been melt processed at least once under vacuum after preparation.
Claim 13
Dependent Claim
18 words
A composition according to claim 11 wherein the melt processing steps are effected by extrusion with vacuum venting.
Claim 14
Dependent Claim
21 words
A composition according to claim 12 wherein about 3-5% of trimellitic acid anhydride salicylate ester is blended, based on polyphenylene ether.
Claim 15
Dependent Claim
11 words
A composition according to claim 13 wherein R 1 is phenyl.
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) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |