US3869430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High modulus, high tenacity poly(p-phenylene terephthalamide) fiber
Assignee: EIDP Inc
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Filing: 1972-06-30
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Granted: 1975-03-04
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Expires: 1992-06-30
Abstract
Abstract High strength, high modulus fibers having a density of at least 1.4o g./cm.3 and consisting essentially of poly(p-phenylene terephthalamide) of inherent viscosity of at least 4.0 are provided. These fibers have a lateral birefringence of at least 0.022, a novel crystalline structure with crystalline regions having an apparent crystallite size of greater than 58 Angstrom units (A), and an orientation angle no greater than 13* with the proviso that the ratio of the apparent crystallite size to the orientation angle (degrees) is at least 6A/degree.
Inventors
- 👤 Herbert Blades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A HIGH TENACITY, HIGH MODULUS FIBER HAVING A DENSITY OF AT LEAST 1.40 GRAMS PER CUBIC CENTIMETER AND CONSISTING ESSENTIALLY OF POLY(P-PHENYLENE TEREPHTHALAMIDE), THE POLYMER OF SAID FIBER HAVING AN INHERENT VISCOSITY OF AT LEAST 4.0 AS MEASURED AT A CONCENTRATION OF 0.5 GRAM OF POLYMER IN 100 ML. OF CONCENTRATED SULFURIC ACID (95-98% H2SO4) AT 30*C. AND SAID FIBER HAVING 1) A LATERAL BIREFRINGENCE, $N, OF AT LEAST 0.022 AS DETERMINED FROM MEASUREMENTS ON OBLIQUE FIBER SECTIONS OF THICKNESS, T, IN MICRONS, WITH A POLARIZING MICROSCOPE EQUIPPED WITH A COMPENSATOR, USING THE EQUATION:
Claim 2
Dependent Claim
94 words
A HIGH TENACITY, HIGH MODULUS FIBER HAVING A DENSITY OF AT LEAST 1.40 GRAMS PER CUBIC CENTIMETER AND CONSISTING ESSENTIALLY OF POLY(P-PHENYLENE TEREPHTHALAMIDE), THE POLYMER OF SAID FIBER HAVING AN INHERENT VISCOSITY OF AT LEAST 4.0 AS MEASURED AT A CONCENTRATION OF 0.5 GRAM OF POLYMER IN 100 ML. OF CONCENTRATED SULFURIC ACID (95-98% H2SO4) AT 30*C. AND SAID FIBER HAVING 1) A LATERAL BIREFRINGENCE, $N, OF AT LEAST 0.022 AS DETERMINED FROM MEASUREMENTS ON OBLIQUE FIBER SECTIONS OF THICKNESS, T, IN MICRONS, WITH A POLARIZING MICROSCOPE EQUIPPED WITH A COMPENSATOR, USING THE EQUATION:
Claim 3
Dependent Claim
17 words
The fiber of claim 1 wherein the crystalline regions have an orientation angle of less than 10*.
Claim 4
Dependent Claim
16 words
The fiber of claim 1 having a filament tenacity of at least 22 grams per denier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |