US4012557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nylon-6 filament and method of manufacture thereof
Assignee: Individual
•
Filing: 1975-08-06
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Granted: 1977-03-15
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Expires: 1995-08-06
Abstract
Abstract A nylon-6 filament and a method for manufacturing the same to achieve a high degree of permeability to ultraviolet rays in fabric formed from such filament comprising the steps of adding potassium or sodium bromide to the filament to render the same more pervious to ultraviolet rays than before such treatment, spinning the filament by extrusion, treating the spun filament with a solvent which dissolves superficially the filament surface with cooling after each of the steps to prevent the generation of spherulites, the extruded filament being preferably of an oval cross-sectional shape. Further it is optional to color the filament.
Inventors
- 👤 Jean-Philippe Cornelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:56
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/144; D01; D01D; D01D10/00; D01D10/04; D01D10/0436; D01D5/00; D01D5/253; D01F; D01F1/00; D01F1/02; D01F1/10; D01F1/106; D06M11/00; D06M11/07; D06M11/11; D06M11/13; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
A method of manufacturing a synthetic filament from nylon-6 to permit yarn or fabric made therefrom to be highly pervious to ultraviolet rays consisting essentially of treating nylon-6 in powder form in an aqueous solution containing about 0.5% of an alkali-metal salt selected from the group consisting of potassium bromide and sodium bromide melt-spinning the so-treated nylon-6 by extrusion with intimate mixing through an oval-shaped orifice to form an oval-shaped extruded spun filament having a temperature of about 200° C, immediately cooling the spun filament to the Brill point thereof in order to avoid the formation of spherulites which are an obstacle to the passage of ultraviolet rays, dissolving the superficial shiny surface of the cooled filament by drawing said filament through a bath of saturated aqueous solution of copper lactate or formic acid, at a temperature of about 55° C, again cooling to the Brill point, thus providing an oval-shaped nylon-6 filament that is pervious to ultraviolet rays.
Claim 2
Independent Claim
159 words
A method of manufacturing a synthetic filament from nylon-6 to permit yarn or fabric made therefrom to be highly pervious to ultraviolet rays consisting essentially of treating nylon-6 in powder form in an aqueous solution containing about 0.5% of an alkali-metal salt selected from the group consisting of potassium bromide and sodium bromide melt-spinning the so-treated nylon-6 by extrusion with intimate mixing through an oval-shaped orifice to form an oval-shaped extruded spun filament having a temperature of about 200° C, immediately cooling the spun filament to the Brill point thereof in order to avoid the formation of spherulites which are an obstacle to the passage of ultraviolet rays, dissolving the superficial shiny surface of the cooled filament by drawing said filament through a bath of saturated aqueous solution of copper lactate or formic acid, at a temperature of about 55° C, again cooling to the Brill point, thus providing an oval-shaped nylon-6 filament that is pervious to ultraviolet rays.
Claim 3
Dependent Claim
27 words
A method in accordance with claim 1 wherein the melt spun filament is subjected to an additonal step of stretching or drawing to provide necessary filament strength.
Claim 4
Dependent Claim
32 words
A method in accordance with claim 1 wherein the melt spun filament is cooled to room temperature immediately after extrusion and also after dissolution of the superficial shiny surface of the filament.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1 wherein the bromide is sodium bromide.
Claim 6
Dependent Claim
13 words
A method in accordance with claim 1 wherein the bromide is potassium bromide.
Claim 7
Dependent Claim
13 words
A method in accordance with claim 1 wherein the solvent is copper lactate.
Claim 8
Dependent Claim
13 words
A method in accordance with claim 1 wherein the solvent is formic acid.
Claim 9
Dependent Claim
12 words
A nylon-6 filament made in accordance with the method of claim 1.
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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |