US4036907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(meta-phenylene isophthalamide) composition
Assignee: EIDP Inc
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Filing: 1975-11-10
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Granted: 1977-07-19
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Expires: 1995-11-10
Abstract
Abstract A poly(meta-phenylene isophthalamide) powder is provided which is coalescible under the influence of pressure followed by heating at temperatures below its crystalline melting point to provide molded objects of a solid and homogeneous nature. A process for preparing coalescible powders of poly(meta-phenylene isophthalamide) also is provided wherein a solution of said polymer in a solvent such as DMAC is added to a precipitant such as water to provide a slurry which is filtered, followed by washing and drying the resulting filter cake to provide a crumb which is ground and screened through a sieve of 35 mesh size (U.S. Standard).
Inventors
- 👤 John William Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:23
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08L; C08L77/00; C08L77/10; C08J2377/00; C08J2377/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A composition consisting essentially of a coalescible and densifiable powder of poly(meta-phenylene isophthalamide) having a density of between about 1.0 g./cc. and about 1.30 g./cc. when pressed into a preform and a density when sintered of at least about 1.24 g./cc. and between about 1% and about 75% by weight, based upon the total weight of said composition, of particulate halocarbon resin.
Claim 2
Dependent Claim
62 words
A composition consisting essentially of a coalescible and densifiable powder of poly(meta-phenylene isophthalamide) having a density of between about 1.0 g./cc. and about 1.30 g./cc. when pressed into a preform and a density when sintered of at least about 1.24 g./cc. and between about 1% and about 75% by weight, based upon the total weight of said composition, of particulate halocarbon resin.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein said halocarbon resin is a polymer of tetrafluoroethylene.
Claim 4
Dependent Claim
12 words
The composition of claim 2 wherein said polymer of tetrafluoroethylene is polytetrafluoroethylene.
References Cited (Backward Citations)
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Cited
US2975128A
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US3228902A
Cited
US3287288A
Cited
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US3661823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |