Patent EP0140559A2 successfully refreshed from Google Patents.
EP0140559A2
Expired / Lapsed
EP
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Improved high speed process for forming fully drawn polyester yarn
Assignee: Celanese Corp
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Filing: 1984-09-13
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Granted: —
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Expires: 2004-09-13
Abstract
Abstract @ An improved process is provided for producing fully drawn multifilamentary polyethylene terephthalate yarn via a high speed melt spinning process wherein the multifilamentary material following solidification is passed through a heated conditioning zone wherein substantial crystallisation takes place. Such multifilamentary product is withdrawn from the conditioning zone at a speed in excess of 8000 feet (2438 m) per minute and a conventional drawing step is not required. In accordance with the concept of the present invention it surprisingly has been found that the uniformity of the multifilamentary product is enhanced by the inclusion of a minor substantially uniformly dispersed concentration of particulate silicon dioxide (e.g. fumed silica) in the molten polyethylene terephthalate polymer prior to extrusion and such subsequent processing. In a particularly preferred embodiment the particulate silicon dioxide is substantially uniformly dispersed within the polyethylene terephthalate as a result of its prior admixture with the reactants which were polymerised to form the polyethylene terephthalate.
Inventors
- 👤 James J. Breuning
- 👤 Robert D. Johnson
- 👤 Gregory K. Morris
- 👤 Cornell Whitley
- 👤 David F. Whitley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 12:02
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01F; D01F1/00; D01F1/02; D01F1/10; D01D5/098; D01F6/00; D01F6/58; D01F6/62
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
182 words
A process for the formation of a highly spin oriented polyethylene terephthalate yarn comprising (a) extruding molten fibre-forming polyethylene terephthalate through a plurality of orifices to form a molten multifilamentary material, (b) passing said molten multifilamentary material in the direction of its length through a solidification zone provided with a gaseous atmosphere at a temperature below the glass transition temperature thereof wherein said multifilamentary material is quenched and is transformed to a solid multifilamentary material, (c) passing said resulting multifilamentary material in the direction of its length through a conditioning zone provided with a gaseous atmosphere at a temperature above the glass transition temperature thereof and below the melting temperature thereof wherein substantial crystallisation of said previously solidified multifilamentary material takes place, and (d) withdrawing said resulting multifilamentary material from the conditioning zone at a speed in excess of 8000 feet (2438 m) per minute; characterised in that there.ts substantially uniformly dispersed within said fibre-forming polyethylene terephthalate prior to step (a) 0.05 to 1.5 percent by weight of particulate silicon dioxide having a weight average particle size of less than 1 micron.
Claim 2
Dependent Claim
182 words
A process for the formation of a highly spin oriented polyethylene terephthalate yarn comprising (a) extruding molten fibre-forming polyethylene terephthalate through a plurality of orifices to form a molten multifilamentary material, (b) passing said molten multifilamentary material in the direction of its length through a solidification zone provided with a gaseous atmosphere at a temperature below the glass transition temperature thereof wherein said multifilamentary material is quenched and is transformed to a solid multifilamentary material, (c) passing said resulting multifilamentary material in the direction of its length through a conditioning zone provided with a gaseous atmosphere at a temperature above the glass transition temperature thereof and below the melting temperature thereof wherein substantial crystallisation of said previously solidified multifilamentary material takes place, and (d) withdrawing said resulting multifilamentary material from the conditioning zone at a speed in excess of 8000 feet (2438 m) per minute; characterised in that there.ts substantially uniformly dispersed within said fibre-forming polyethylene terephthalate prior to step (a) 0.05 to 1.5 percent by weight of particulate silicon dioxide having a weight average particle size of less than 1 micron.
Claim 3
Dependent Claim
40 words
A process according to claim 1 wherein the polyethylene terephthalate prior to step (a) has an intrinsic viscosity of 0.35 to 1.0 determined with a solution of 0.1 gram of the polymer dissolved in 100 ml. of ortho-chlorophenol at 25°C.
Claim 4
Dependent Claim
33 words
A process according to claim 2 wherein the polyethylene terephthalate exhibits an intrinsic viscosity of approximately 0.7 determined with a solution of 0.1 gram of polymer dissolved in 100 ml. of ortho-chlorophenol at'25°C.
Claim 5
Dependent Claim
26 words
A process according to any of claims 1 - 3 wherein the gaseous atmosphere of step (b) is provided at a temperature of 10 to 40°C.
Claim 6
Dependent Claim
19 words
A process according to any of claims 1 - 4 wherein the gaseous atmosphere of step (b) is air.
Claim 7
Dependent Claim
26 words
A process according to any of claims 1 - 5 wherein the gaseous atmosphere of step (c) is provided at a temperature of 90 to 220°C.
Claim 8
Dependent Claim
18 words
A process according to any.of claims 1 - 6 wherein the gaseous atmosphere of step (c) is air.
Claim 9
Dependent Claim
34 words
A process according to any of claims 1 - 7 wherein in step (d) the resulting multifilamentary material is withdrawn at a speed of 8,000 to 16,000 feet (2438 to 4877 m) per minute.
Claim 10
Dependent Claim
30 words
A process according to claim 8 wherein in step (d) the resulting multifilamentary material is withdrawn at a speed of 11,000 to 13,000 feet (3353 to 3962 m) per minute.
Claim 11
Dependent Claim
40 words
A process according to any of claims 1 - 9 wherein the multifilamentary material which is withdrawn from step (d) consists of 6 to 200 continuous filaments each having a substantially constant denier within the range of 1 to 5.
Claim 12
Dependent Claim
33 words
A process according to any of claims 1 - 10 wherein the particulate silicon dioxide is substantially uniformly dispersed in the polyethylene terephthalate in a concentration of 0.1 to 1.0 percent by weight.
Claim 13
Dependent Claim
46 words
A process according to any of claims 1 - 11 wherein the particulate silicon dioxide is substantially uniformly dispersed within the fibre-forming polyethylene terephthalate prior to step (a) as a result of its prior admixture with the reactants which were polymerised to form the polyethylene terephthalate.
Claim 14
Dependent Claim
41 words
A process according to any of claims 1 - 12 wherein the polyethylene terephthalate from which the multifilamentary material is extruded is free of solid particulate material other than the silicon dioxide and the resulting filamentary product possesses a lustrous appearance.
Claim 15
Dependent Claim
60 words
A process according to any of claims 1 - 12 wherein the polyethylene terephthalate from which the multifilament-- ary material is extruded additionally contains substantially uniformly dispersed therein 0.05 to 1.5 percent by weight of particulate titanium dioxide having a weight average particle size of less than 2 microns and the resulting filamentary product possesses a semi-dull or dull appearance.
Claim 16
Dependent Claim
31 words
A process according to any of claims 1 - 14 wherein the particulate silicon dioxide possesses a nominal particle size of less than 0.1 micron as determined by the BET method.
Claim 17
Dependent Claim
18 words
A process according to any of claims 1 - 15 wherein the particulate silicon dioxide is fumed silica.
Claim 18
Dependent Claim
22 words
A process according to any of claims 1 - 16 wherein the polyethylene terephthalate is made by polymerising dimethylterephthalate and ethylene glycol.
Claim 19
Dependent Claim
23 words
A process according to any of claims 1 - 16 wherein the polyethylene terephthalate is made by polymerising terephthalic acid and ethylene glycol.
Claim 20
Dependent Claim
243 words
An improved process for the formation of a highly spin oriented polyethylene terephthalate yarn according to any of the previous claims comprising: (1) polymerising monomers capable of forming polyethylene terephthalate while in admixture with particulate fumed silica, having a nominal particle size of less than 0.1 micron as determined by the BET method to form a fibre-forming polymer having an intrinsic viscosity of 0.5 to 0.8 determined with a solution of 0.1 gram of the polymer dissolved in 100 ml. of ortho-chlorophenol at 25°C., (2) extruding the resulting polyethylene terephthalate while in molten form and containing 0.1 to 1.0 percent by weight of the particulate fumed silica introduced in step (1) substantially uniformly dispersed therein through a plurality of orifices to form a molten multifilamentary material, (3) passing said molten multifilamentary material in the direction of its length through a solidification zone provided with a gaseous atmosphere at a temperature below the glass transition temperature thereof wherein the multifilamentary material is quenched and is transformed to a solid multifilamentary material, (4) passing the resulting multifilamentary material in the direction of its length through a conditioning zone provided with a gaseous atmosphere at a temperature above the glass transition temperature thereof and below the melting temperature thereof wherein substantial crystallisation of the previously solidified miltifilamentary material takes place, and (5) withdrawing the resulting multifilamentary material from the conditioning zone at a speed of 8,000 to 16,000 feet (2438 to 4877 m) ; per minute.
Claim 21
Dependent Claim
29 words
A process according to claim 19 wherein the particulate fumed silica is substantially uniformly dispersed in the polyethylene terephthalate in a concentration of 0.10 to 0.40 percent by weight.
Claim 22
Dependent Claim
29 words
A process according to claim 19 or 20 wherein the particulate fumed silica has a nominal particle size of less than 0.02 micron as determined by the BET method.
References Cited (Backward Citations)
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