Patent US4413110A successfully refreshed from Google Patents.
US4413110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High tenacity, high modulus polyethylene and polypropylene fibers and intermediates therefore
Assignee: Honeywell International Inc
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Filing: 1982-03-19
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Granted: 1983-11-01
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Expires: 2002-03-19
Abstract
Abstract Solutions of ultrahigh molecular weight polymers such as polyethylene in a relatively non-volatile solvent are extruded through an aperture at constant concentration through the aperture and cooled to form a first gel of indefinite length. The first gels are extracted with a volatile solvent to form a second gel and the second gel is dried to form a low porosity xerogel. The first gel, second gel or xerogel, or a combination, are stretched. Among the products obtainable are polyethylene fibers of greater than 30 or even 40 g/denier tenacity and of modulus greater than 1000 or even 1600 or 2000 g/denier.
Inventors
- 👤 Sheldon Kavesh
- 👤 Dusan C. Prevorsek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; Y; Y10; Y10S; Y10S428/00; Y10S428/902
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
84 words
A stretched polyethylene fiber of substantially indefinite length being of weight average molecular weight at least about 500,000 and having a tenacity of at least about 20 g/denier, a tensile modulus at least about 500 g/denier, a creep value no more than about 5% (when measured at 10% of breaking load for 50 days at 23° C.), a porosity less than about 10% and a main melting temperature of at least about 147° C. (measured at 10° C./minute heating rate by differential scanning calorimetry).
Claim 2
Dependent Claim
84 words
A stretched polyethylene fiber of substantially indefinite length being of weight average molecular weight at least about 500,000 and having a tenacity of at least about 20 g/denier, a tensile modulus at least about 500 g/denier, a creep value no more than about 5% (when measured at 10% of breaking load for 50 days at 23° C.), a porosity less than about 10% and a main melting temperature of at least about 147° C. (measured at 10° C./minute heating rate by differential scanning calorimetry).
Claim 3
Dependent Claim
26 words
The stretched polyethylene fiber of claim 1 having a tenacity of at least about 30 g/denier and a tensile modulus of at least about 1000 g/denier.
Claim 4
Dependent Claim
17 words
The stretched polyethylene fiber of claim 2 having a tensile modulus of at least about 1600 g/denier.
Claim 5
Dependent Claim
17 words
The stretched polyethylene fiber of claim 2 having a tensile modulus of at least about 2000 g/denier.
Claim 6
Dependent Claim
29 words
The stretched polyethylene fiber of claim 1 or 2 having a main melting temperature at least about 149° C. (measured at 10° C./minute heating rate by differential scanning calorimetry).
Claim 7
Dependent Claim
33 words
The stretched polyethylene fiber of claim 1 or 2 or 3 or 4 having a main melting temperature of at least about 149° C. (measured at 10°/minute heating rate by differential scanning calorimetry).
Claim 8
Dependent Claim
24 words
The stretched polyethylene fiber of claim 1 or 2 or 3 or 4 being of weight average molecular weight of at least about 1,000,000.
Claim 9
Dependent Claim
25 words
The stretched polyethylene fiber of claim 1 or 2 or 3 or 4 being of weight average molecular weight between about 2,000,000 and about 8,000,000.
Claim 10
Dependent Claim
58 words
A stretched polyethylene fiber of substantially indefinite length being of weight average molecular weight of at least about 1,000,000 and having a tensile modulus of at least about 1600 g/denier, a main melting temperature of at least about 147° C. (measured at 10° C./minute heating rate by differential scanning calorimetry) and an elongation-to-break of not more than 5%.
Claim 11
Dependent Claim
58 words
A stretched polyethylene fiber of substantially indefinite length being of weight average molecular weight of at least about 1,000,000 and having a tensile modulus of at least about 1600 g/denier, a main melting temperature of at least about 147° C. (measured at 10° C./minute heating rate by differential scanning calorimetry) and an elongation-to-break of not more than 5%.
Claim 12
Dependent Claim
19 words
The stretched polyethylene fiber of claim 9 being of weight average molecular weight between about 2,000,000 and about 8,000,000.
Claim 13
Dependent Claim
30 words
The stretched polyethylene fiber of claim 9 or 10 having a main melting temperature of at least about 149° C. (measured at 10° C./minute heating rate by differential scanning calorimetry).
Claim 14
Dependent Claim
19 words
The stretched polyethylene fiber of claim 9 or 10 having a tensile modulus of at least about 2000 g/denier.
Claim 15
Dependent Claim
59 words
A stretched polypropylene fiber of substantially indefinite length being of weight average molecular weight of at least about 750,000 and having a tenacity of at least about 8 g/denier, a tensile modulus of at least about 160 g/denier and a main melting temperature of at least about 168° C. (measured at 10° C./minute heating rate by differential scanning calorimetry).
Claim 16
Dependent Claim
59 words
A stretched polypropylene fiber of substantially indefinite length being of weight average molecular weight of at least about 750,000 and having a tenacity of at least about 8 g/denier, a tensile modulus of at least about 160 g/denier and a main melting temperature of at least about 168° C. (measured at 10° C./minute heating rate by differential scanning calorimetry).
Claim 17
Dependent Claim
16 words
The stretched polypropylene fiber of claim 13 having a tenacity of at least about 11 g/denier.
Claim 18
Dependent Claim
16 words
The stretched polypropylene fiber of claim 13 having a tenacity of at least about 13 g/denier.
Claim 19
Dependent Claim
17 words
The stretched polypropylene fiber of claim 13 having a tensile modulus of at least about 200 g/denier.
Claim 20
Dependent Claim
17 words
The stretched polypropylene fiber of claim 13 having a tensile modulus of at least about 220 g/denier.
Claim 21
Dependent Claim
25 words
The stretched polypropylene fiber of claim 13 or 14 or 15 or 16 or 17 being of weight average molecular weight at least about 1,000,000.
Claim 22
Dependent Claim
27 words
The stretched polypropylene fiber of claim 13 or 14 or 15 or 16 or 17 being of weight average molecular weight between about 2,000,000 and about 8,000,000.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |