US4017459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-imides
Assignee: Dow Chemical Co
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Filing: 1975-09-19
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Granted: 1977-04-12
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Expires: 1995-09-19
Abstract
Abstract Polyamide-imides are described which are derived by conventional procedures from 2,2-bis[4-(p-aminophenoxy)-phenyl]propane (or the corresponding diisocyanate) and trimellitic acid (preferably through the anhydride acid chloride). Copolyamide-imides derived from trimellitic acid, the above diamine (or diisocyanate) and certain other aromatic diamines or diisocyanates (4,4'-diaminodiphenyl ether, m-phenylene diamine and corresponding diisocyanates are preferred) are also described. The above polyamide-imides are engineering thermoplastics which, unlike closely related polyamides and polyimides, can be extruded and injection molded to form parts having good mechanical properties.
Inventors
- 👤 Besir K. Onder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:37
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A polyamide-imide characterized by the presence in random arrangement of at least two recurring units having the formulae: ##STR5##wherein R in each case represents ##STR6##
Claim 2
Dependent Claim
25 words
A polyamide-imide characterized by the presence in random arrangement of at least two recurring units having the formulae: ##STR5##wherein R in each case represents ##STR6##
Claim 3
Dependent Claim
28 words
A copolyamide-imide according to claim 1 in which up to 50 percent of the divalent radicals R in said recurring units are selected from the class consisting of
Claim 4
Dependent Claim
22 words
A copolyamide-imide according to claim 1 in which up to 50 percent of the divalent radicals in said recurring units are ##STR7##
Claim 5
Dependent Claim
13 words
A copolyamide-imide according to claim 1 in which up to 50 percent of
Claim 6
Dependent Claim
41 words
A polyamide-imide according to claim 1 having a molecular weight number average (M n ) in the range of about 5,000 to about 15,000 and a molecular weight weight average (M w ) in the range of about 10,000 to 120,000.
References Cited (Backward Citations)
US3505288A
Cited
US3573260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |