US4283361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of shaped articles of poly(metaphenylene isophthalamide)
Assignee: EIDP Inc
•
Filing: 1979-12-31
•
Granted: 1981-08-11
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Expires: 1999-12-31
Abstract
Abstract Process for the preparation of shaped articles of poly(metaphenylene isophthalamide) by simultaneously heating poly(metaphenylene isophthalamide) and applying moderately elevated pressures.
Inventors
- 👤 Ruskin Longworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:27
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; C; C08; C08G; C08G69/00; C08G69/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A process for the preparation of shaped articles having a tensile strength of at least about 14,800 psi from coalescible and densifiable powder of poly(methaphenylene isophthalamide) by heating the powder in a mold of the desired configuration to a temperature of about from 265° to 320° C. while simultaneously maintaining the powder under a pressure of about from 100 to 2500 psi.
Claim 2
Dependent Claim
62 words
A process for the preparation of shaped articles having a tensile strength of at least about 14,800 psi from coalescible and densifiable powder of poly(methaphenylene isophthalamide) by heating the powder in a mold of the desired configuration to a temperature of about from 265° to 320° C. while simultaneously maintaining the powder under a pressure of about from 100 to 2500 psi.
Claim 3
Dependent Claim
15 words
A process of claim 1 wherein the temperature is about from 285° to 295° C.
Claim 4
Dependent Claim
15 words
A process of claim 1 wherein the pressure is about from 200 to 1500 psi.
Claim 5
Dependent Claim
31 words
A process of claim 1 wherein the poly(metaphenylene isophthalamide) powder comprises about from 1 to 75 percent by weight, based on the total weight of the composition, of a particulate additive.
Claim 6
Dependent Claim
21 words
A process of claim 4 wherein the additive is incorporated by having been present during the precipitation of the poly(metaphenylene isophthalamide).
Claim 7
Dependent Claim
21 words
A process of claim 4 wherein the particulate additive comprises about from 16 to 60 percent by weight of the composition.
Claim 8
Dependent Claim
17 words
A process of claim 1 wherein the poly(metaphenylene isophthalamide) is previously formed to about the desired configuration.
References Cited (Backward Citations)
US3413394A
Cited
US3287324A
Cited
US4016140A
Cited
US3925323A
Cited
US3965236A
Cited
US4036907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |