US4344908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making polymer filaments which have a high tensile strength and a high modulus
Assignee: Stamicarbon BV
•
Filing: 1980-02-06
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Granted: 1982-08-17
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Expires: 2000-02-06
Abstract
Abstract A process for making polymer filaments which have a high tensile strength and a high modulus by stretching a polymer filament which contains an appreciable amount of polymer solvent at a temperature between the swelling point and the melting point of the polymer.
Inventors
- 👤 Paul Smith
- 👤 Pieter J. Lemstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:15
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; D01D; D01D10/00; D01D10/02; D01D5/00; D01D5/12; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2223/00; B29K2223/04; B29K2223/06; B29K2995/00; B29K2995/0037; B29K2995/0088; D07; D07B; D07B1/00; D07B1/02; D07B1/025; D07B2205/00; D07B2205/20; D07B2205/201; D07B2205/2014; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
A process for making polymer filaments which have a high tensile strength and a high modulus comprising the steps of, (a) spinning a solution of a polymer, ranging from about 1% to about 5% by weight of polymer to solvent, through a spinning aperture to form a filament, (b) cooling said filament of step (a) to below the solution temperature of the polymer either in a zone containing a gas without promoting the evaporation of the solvent or with a cooling liquid that does not dilute or extract the solvent in the filament, (c) bringing said filament to a temperature between the swelling point of the polymer in the solvent and the melting point of the polymer and, (d) stretching the filament that still contains at least about 25% by weight of solvent relative to the polymer, at a stretching ratio of at least 5.
Claim 2
Dependent Claim
145 words
A process for making polymer filaments which have a high tensile strength and a high modulus comprising the steps of, (a) spinning a solution of a polymer, ranging from about 1% to about 5% by weight of polymer to solvent, through a spinning aperture to form a filament, (b) cooling said filament of step (a) to below the solution temperature of the polymer either in a zone containing a gas without promoting the evaporation of the solvent or with a cooling liquid that does not dilute or extract the solvent in the filament, (c) bringing said filament to a temperature between the swelling point of the polymer in the solvent and the melting point of the polymer and, (d) stretching the filament that still contains at least about 25% by weight of solvent relative to the polymer, at a stretching ratio of at least 5.
Claim 3
Dependent Claim
168 words
A process for making polymer filaments which have a high tensile strength and a high modulus comprising the steps of, (a) spinning a solution of polymer ranging from about 1% to about 5% by weight of polymer to solvent through a spinning aperture to form a filament, (b) cooling said filament of step (a) to below the solution temperature of the polymer to form a polymer gel in either a zone containing a gas without promoting the evaporation of the solvent or with a cooling liquid that does not dilute or extract the solvent in the filament, (c) adjusting the temperature of said polymer gel filament to a value between the swelling point of the polymer and the melting point of the polymer, (d) stretching the filament, that still contains at least about 25% by weight of solvent relative to the polymer, at a stretching ratio of at least 5, wherein there is at least a partial evaporation of the solvent, and (e) recovering a substantially solvent-free filament.
Claim 4
Dependent Claim
168 words
A process for making polymer filaments which have a high tensile strength and a high modulus comprising the steps of, (a) spinning a solution of polymer ranging from about 1% to about 5% by weight of polymer to solvent through a spinning aperture to form a filament, (b) cooling said filament of step (a) to below the solution temperature of the polymer to form a polymer gel in either a zone containing a gas without promoting the evaporation of the solvent or with a cooling liquid that does not dilute or extract the solvent in the filament, (c) adjusting the temperature of said polymer gel filament to a value between the swelling point of the polymer and the melting point of the polymer, (d) stretching the filament, that still contains at least about 25% by weight of solvent relative to the polymer, at a stretching ratio of at least 5, wherein there is at least a partial evaporation of the solvent, and (e) recovering a substantially solvent-free filament.
Claim 5
Dependent Claim
31 words
The process of claim 1 or 2 wherein the spun filament is cooled below the swelling point and then stretched at a temperature between the swelling point and the melting temperature.
Claim 6
Dependent Claim
23 words
The process of claim 3 wherein a filament containing at least about 100% by weight of solvent relative to the polymer is stretched.
Claim 7
Dependent Claim
16 words
Process of claim 3, wherein a polyolefin dissolved in a hydrocarbon solvent is spun to filaments.
Claim 8
Dependent Claim
8 words
Process of claim 5, wherein polyethylene is spun.
Claim 9
Dependent Claim
17 words
Process of claim 6, wherein the filament is stretched at a stretching ratio of at least 10.
Claim 10
Dependent Claim
17 words
Process of claim 6, wherein the filament is stretched at a stretching ratio of at least 20.
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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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |