US4410684A
Expired / Lapsed
US
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Aromatic copolyamides containing ether linkages
Assignee: Dow Chemical Co
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Filing: 1983-02-07
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Granted: 1983-10-18
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Expires: 2003-02-07
Abstract
Abstract Novel copolyamides having the recurring unit ##STR1## are disclosed wherein Ar in the major proportion of the recurring units is m-phenylene and in the corresponding minor proportion (but more than 10 percent) of the recurring units Ar is a phenylene ether having the formula ##STR2## The copolyamides have excellent high temperature resistance but, unlike those polymers in which Ar in the above recurring unit is exclusively m-phenylene, they can be injection molded.
Inventors
- 👤 II Robert G. Nelb
- 👤 Kemal Onder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:24
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G69/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A copolyamide having the recurring unit ##STR16## wherein Ar in about 65 to about 85 percent of the recurring units is m-phenylene and in the remainder of the recurring units Ar is a phenylene ether having the formula ##STR17##
Claim 2
Dependent Claim
39 words
A copolyamide having the recurring unit ##STR16## wherein Ar in about 65 to about 85 percent of the recurring units is m-phenylene and in the remainder of the recurring units Ar is a phenylene ether having the formula ##STR17##
Claim 3
Dependent Claim
33 words
A copolyamide according to claim 1 wherein Ar in about 70 percent of said recurring units is m-phenylene and the remainder of said units are those in which Ar is said phenylene ether.
Claim 4
Dependent Claim
33 words
A copolyamide according to claim 1 wherein Ar in about 80 percent of said recurring units is m-phenylene and the remainder of said units are those in which Ar is said phenylene ether.
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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |