Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1999-12-27
2000-10-24
Edwards, N.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428395, 26417217, D01F 500
Patent
active
061364355
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polyester filament yarn having an improved winding performance and a large increase in residual elongation, and a process for producing the same.
More particularly, the present invention relates to a polyester filament yarn having an improved winding performance and a large increase in residual elongation, obtained by preparing a melt of a mixture of a polyester resin and particles of an addition-polymerization product of a unsaturated monomer, which particles have a specific thermal deformation temperature (T), and are dispersed in a melt of a polyester resin, by melt-extruding the melt mixture and by taking up the resultant polyester filament yarn at a high speed to cause the addition polymerization product particles dispersed in each filament to be elongated along the longitudinal axis of the filament, and provided that the filament has a non-hollow circular cross-section, the distribution density of the particles to be maximized in an annular area between two concentric circles having radiuses corresponding to 1/3 and 2/3 of the radius of the circular cross-section of the filament, and to a process for producing the same.
BACKGROUND ART
In a melt-spinning for a polyester filament yarn, an increase as large as possible in the extruding rate of the polymer through a spinneret significantly contributes to enhancing the productivity of the polyester filament yarn. In the current fiber industry, the above-mentioned increase in the extruding rate is considered to be preferable from a point of view of a cost reduction in the production of the polyester filament yarn.
As a typical means for enhancing the productivity of the polyester filament yarn, a method in which the extruded polyester filament yarn is taken up at an increased speed to increase the extruding rate of the polyester filament yarn through the spinneret is known. In this conventional method, however, since the taking-up speed of the extruded polyester filament yarn is high, and thus the degree of orientation of the polyester molecules in each polyester filament increases, the resultant filament yarn disadvantageously exhibits a decreased residual elongation. Therefore, naturally, the maximum draw ratio of the polyester filament yarn in the subsequent drawing step or draw-false twisting step decreases. Thus, the disadvantageous decrease in the drawing property of the polyester filament yarn in the drawing or draw-false twisting step offsets the extruding rate-increasing effect due to the increase in the taking-up speed.
As one means for solving the above-mentioned problem, European Patent Publication No. 47464-A1 discloses a polyester filament yarn-producing method in which an addition-polymerization product of an unsaturated organic monomer is added as a filament elongation-enhancing agent to a polyester resin, to increase the residual elongation of the resultant melt-spun polyester filament yarn. In this method of the European patent publication at, for example, page 9, line 3, the addition polymerization product finely dispersed in the particle form molecular size in the polyester resin, and the resultant fine particles of the polymer are considered to serve as rollers or runners for the polyester resin. The European patent publication discloses, as a practical example of the addition-polymerization product, "DELPET 80N". In an actual measurement result, the polymer exhibited a thermal deformation temperature of 98.degree. C.
The above-mentioned method of the European patent publication is useful for producing a partially (or pre-) oriented polyester filament yarn (POY) and a melt-spun polyester filament yarn having a high residual elongation, namely an as-spun filament yarn, and a polyester filament yarn (FOY) produced, under a super high speed, by a coupled spinning and drawing process. However, when the inventors of the present invention have an attempt to wind up the as-spun polyester filament yarn as disclosed in the European patent publication and having a high residual elongation by
REFERENCES:
patent: 5565522 (1996-10-01), Bohringer et al.
Kuroda Toshimasa
Yoshimura Mie
Edwards N.
Teijin Limited
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