MXPA99010471A - Polyester filament yarn - Google Patents

Abstract

A polyester filament yarn produced by a melt-spinning a mixture of a polyester resin with 0.4 to 4.0 weight%of filament elongation-enhancing agent particles and taking up the filament yarn at a speed of 2500 to 8000 m/minutes, having an increase in residual elongation of 50%or more and exhibiting an improved winding performance, wherein the filament elongation-enhancing agent particles satisfies the requirements (a), (b) and (c):(a) the particles have a thermal deformation temperature of 105 to 130°C, (b) provided that the polyester filaments have a non-hollow circular cross section, the distribution density of the particles is maximized in an annular area between two concentric circles around the center of the cross section, of which the two concentric circles have radiuses corresponding to 1/3 and 2/3 of the radius of the cross section, respectively;and (c) the number of the particles appearing on the filament surfaces is 15 particles/100&mgr;m2 or less.

Description

TECHNICAL FIELD POLYESTER FILAMENT THREAD 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 said yarn. More particularly, the present invention relates to a polyester filament yarn having an improved winding performance and a large increase in residual elongation, which is obtained by preparing a melt of a mixture of a polyester resin and particles of polyester. a polymerization product by the addition of an unsaturated monomer, said particles having a temperature of thermal deformation (T), and they are dispersed in a melt of a polyester resin, by means of melt extrusion of the melt mixture and collecting the yarn of resultant polyester filaments at high speed in order to cause polymerization by the addition of dispersed product particles in each filament to be elongated along the longitudinal axis of the filament, and provided that the filament does not have a circular hollow cross section, the distribution density of the particles to be optimized in a ring-shaped area between two c concentric circles having radii corresponding to 1/3 and 2/3 of the radius of the circular cross section of the filament, and to a process for the production thereof. BACKGROUND ART In a melt spin for a polyester filament yarn, a maximum possible increase in the extrusion rate of the polymer through the spinneret significantly contributes to improving the productivity of the polyester filament yarn. In the current fiber industry, the aforementioned increase in extrusion speed is considered preferable from a cost reduction perspective in the production of polyester filament yarn. As a typical means for increasing the productivity of the polyester filament yarn, a method is known in which the extruded polyester filament yarn is collected at an increased speed in order to increase the extrusion speed of the polyester filament yarn. through the row. In this conventional method, however, since the collection speed of the extruded polyester filament yarn is high, and therefore the degree of orientation of the polyester molecules in each polyester filament increases, the resulting filament yarn presents disadvantageously a decreased residual elongation. Therefore, of course, the maximum stretch ratio of the polyester filament yarn in the subsequent stretch step or in the false-stretch twist pitch decreases. Thus, the disadvantageous decrease in the stretching property of the polyester filament yarn in the stretch or false-twist-stretch step compensates for the effect of increased extrusion velocity due to the increase in the recovery speed. As a method for answering the aforementioned problem, European Patent Publication No. 47464-A1 discloses a method of producing polyester filament yarn in which a polymerization product is added by the addition of an unsaturated organic monomer as an enhancing agent. of filament elongation to a polyester resin, in order to increase the residual elongation of the resulting melt spun polyester filament yarn. In this method of European patent publication, for example, on page 9, row 3, the addition polymerization product finely dispersed in the molecular size in the form of particles in the polyester region, and the resultant fine particles of the polymer They are considered to serve as rollers for the polyester resin. The European patent publication presents, as a practical example of the addition polymerization product, "DELPET 80N", in a real measurement result, the polymer had a thermal deformation temperature of 98 ° C. The aforementioned method of the European publication is useful for the production of a partially oriented or preoriented polyester filament yarn (POY) and a melt spun polyester filament yarn having a high residual elongation, i.e. a filament yarn in the state in which it was spun; and a polyester filament yarn (FOY) produced, at super high speed, by a coupled process of spinning and stretching. However, when the inventors of the present invention tried to wind the polyester filament yarn in the state in which it was spun presented in the European patent publication and which has a high residual elongation by using a commercially available winding device, They faced new problems. Namely, the inventors of the present invention found that in practice the polyester filament yarn in the state in which it was spun could not be wound by a conventional winding device, and a rolled presentation of the yarn could not be formed. As phenomena related to this problem, it was found that since one or more filaments in the yarn had a limited transverse printing property, in the resulting rolled presentation, a cobweb phenomenon was observed in which the yarn fell outside the portion of the yarn. edges, in the form of a normal circumferential wrapping state of the rolled presentation and an irregular wrapping was obtained in the edge portion, whereby the surface of the edge portion was misadjusted resulting in a destruction of the rolled presentation, In addition, a floating yarn was observed in the yarn presentation during the period in which the yarn was being wound, and this phenomenon caused the presentation to be undone. Thus, these phenomena can cause a fatal blow against the polyester filament yarn. It was considered that the causes of the aforementioned problems are that, since the particles of addition polymerization products are not compatible with the polyester resin and serve as rollers for the polyester resin, these particles bleed superiorly on the peripheral surface of the polyester resin. polyester filament which causes the peripheral surface to become too rough, and therefore decreases the friction of the filaments between them (F / F friction), and the friction of the filaments with a metal (friction F / M). Accordingly, the winding performance of the resulting polyester filament yarn decreases or becomes irregular. To avoid the reduction of F / F friction and F / M friction, a person with ordinary skill in the art will provide a means in which an oily agent is applied in order to increase friction F / F and friction F / M to the extruded polyester filament yarn and then the oiled yarn is collected and rolled up. Friction-increasing agents include the addition product of alkylene oxide modified with an aromatic ring or a polyhydric alcohol, for example, polyoxyethylene-octylphenyl ether, polyoxyethylene-nonylphenyl ether, polyoxyethylene-noxylphenyl stearate, polyoxyethylene-p-phenyl ether, and polyoxyethylene-benzylphenyl-phenolic ether; and glycerol propylene oxide (PO) / ethylene oxide (EO) addition products, sorbitol PO / EO addition product and sorbitan addition products PO / EO. Also, friction increase agents include low viscosity compounds having a low lubricating property, for example, polypropylene glycol with a low molecular weight of 500 to 700; esters of rosin and silica. In fact, when the friction enhancing agent was applied on the extruded polyester filament yarn prior to winding, the yarn presentation could be prepared in a good form. However, when the rolled polyester filament yarn was removed from the presentation and subjected to subsequent processing, for example, stretching or false twisting, lint formation and thread breakage were frequently observed, and therefore the processing was not he could continue and an unsatisfactory thread was produced. Accordingly, the use of the friction increase agent was not successful in essentially solving the problems mentioned above. The term "improved winding performance" employed in the present invention relates to a performance of the polyester filament yarn wherein the polyester filament yarn can be stably and smoothly wound in a stretch processing step or Stretch texturing without the use of an oily agent according to what is described above, which causes the formation of lint or thread breakage. PRESENTATION OF THE INVENTION An object of the present invention is to provide a polyester filament yarn devoid of a fatal defect which is that a conventional polyester filament yarn produced with a high speed melt spinning method in combination with the use of filament elongation enhancement agent can not be rolled. While ensuring the level of residual elongation of a yarn resulting at least at the same level as said conventional yarn, and a process for the production thereof. Another object of the present invention is to offer a polyester filament yarn free from the additional defect that the conventional yarn can not be processed smoothly in subsequent processing due to the occurrence of lint and yarn breaks, and a process for the production thereof.

The aforementioned objects can be achieved by the polyester filament yarn, and the process for the production thereof, of the present invention. The polyester filament yarn of the present invention having an improved winding performance, is a yarn produced by means of melt spinning a mixture of a polyester resin with particles of a filament elongation increase agent in an amount 0.5 to 4.0% based on the weight of the polyester resin, and picking up the melt spun polyester filament yarn at a speed of 2,500 to 8,000 m / minute, to form a polyester filament yarn comprising a plurality of filaments each comprising a matrix consisting of the polyester resin and the filament elongation improving agent particles dispersed in the polyester resin matrix, said polyester filament yarn exhibits an increase (I) in residual elongation of 50% or more; determined in accordance with the equation: Where I represents the increase in residual elongation as a percentage of the polyester filament yarn, EIb represents a residual elongation as a percentage of the polyester filament yarn and EL0 represents a residual elongation as a percentage of a yarn of comparative polyester filaments produced by the same procedures as those presented for the polyester filament yarn except that it does not contain filament elongation increase agent in the comparative polyester filaments, Characterized in that said particles of filament elongation increase agent contained in the polyester filament meets the requirements (a), (b), and (c): (a) the filament elongation increase agent particles have a thermal deformation temperature (T) within the range of 105 to 130 ° C, (b) provided that the polyester filaments have a transverse section Circular not hollow. The distribution density of the agent particles which increase the filament elongation in the circular cross-section of the polyester filaments is optimized in a ring-shaped area between two concentric circles around the center of the circular cross section, of which two concentric circles have the radii corresponding to 1/3 and 2/3 of the radius of the circular cross section of the polyester filaments, respectively; and (c) the number (N) of the filament elongation enhancing agent particles that appear on the peripheral surface of the polyester filaments is 15 particles / 1OO square meters or less.

In addition, the process for the production of the polyester filament yarn is as follows. In a process for the production of polyester filament yarn, comprising: extruding a melt of a mixture of a polyester resin with particles of an agent that increases filament elongation in an amount of 0.5 to 4.0% by weight based on the weight of the polyester resin through a spinneret, and collecting the melt-extruded polyester filament yarn at a speed of 2500 to 8000 m / minute, along a spinning line, said process is characterized in that, in the melt extrusion step, the melting passes through a filter having a pore size of 40 μm placed immediately upstream of the spinneret, and in the spinning line, the tensioning of the polyester filament yarn Melt extrusion is controlled within a range of 150 to 1500, thus providing improved rolling performance to said yarn. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a circular cross-section of a filament for the polyester filament yarn of the present invention, in which cross-section schematically shows the distribution of particles of a filament elongation increase agent in the A, B, and C areas of the filament, Figure 2 is a graph showing the distribution density of the filament elongation increase agent particles in areas A, B and C, respectively, of the filament illustrated in the figure 1, Figure 3 shows a cross section of a non-hollow and regular filament for the polyester filament yarn of the present invention, having areas A ', B', and C. Figure 4 is a graph showing the distribution density of the particles of the filament elongation increase agent in the areas C, B ', A', A ", B", and C ", respectively, of the filament illustrated in Figure 3, Figure 5 shows a cross section of a circular hollow filament for the polyester filament yarn of the present invention, having the areas A ", B" and C ". PREFERRED MODALITY OF THE INVENTION In the study of the inventors of the present invention, it was found that when thin films of a polymer produced by polymerization by addition of an unsaturated organic monomer, incompatible with the polyester resin and having a thermal deformation temperature (T) greater than the thermal deformation temperature of the polyester resin, are mixed, as a filament elongation agent, in the polyester resin, and the resulting resin mixture is subjected to a melt-spinning process, the particles of the filament elongation increase agent distributed in each polyester filament of the resulting polyester filament yarn serve as a material resistant to the deformation-elongation of each filament, instead of rollers for the polyester molecules, during the slimming process of the melt extruded filament stream, and the agent particles of Increasing filament elongation are oriented and elongated in the longitudinal direction of each polyester filament. It has also been found that, provided that the polyester filament has a non-hollow circular cross-section, the distribution density of the aforementioned filament elongation increase agent particles in the transverse profile of the polyester filament can be optimized in the ring-shaped area between two concentric circles around the center of the circular transverse profile of which the radii of two concentric circles correspond to 1/3 and 2/3 of the radius of the circular transverse profile of the polyester filament, respectively , both improved rolling performance and satisfactory residual elongation of the polyester filament yarn can be obtained. The present invention was completed based on the aforementioned finding. The background of the present invention will be explained in more detail below. The aforementioned European Patent Publication No. 47464-A presents a concept in which a polyester filament yarn having a residual elongation increase (I) of 50% or more can be obtained by melt extrusion of a mixture of a resin of polyester with a filament elongation increase agent in the form of fine particles which serve as rollers for the molecular orientation of the individual polyester filaments in the resulting filament yarn, and in an amount of 0.5 to 4% by weight in based on the weight of the polyester resin, and, picking up the filament yarn extruded in melt at a speed of 2500 to 8000 m / minute along a spinning line. Likewise, the European publication presents, as only a practical filament elongation increase agent, "DELPET 80N" which has a really measured thermal deformation temperature (T) of 98 ° C. In the present invention, filament elongation increase agents are limited to agents having a thermal deformation temperature (T) of 105 ° C to 130 ° C, and therefore problems that could not be solved can be solved. for the invention of the European publication, namely the difficulty of rolling. In the polyester filament yarn of the present invention, the filament elongation enhancement agent particles are incompatible with the polyester resin. A) Yes, in the melt extrusion step, the filament elongation increase agent particles and the polyester resin are present in the melting state of an island-like mixture in a sea where the islands consist of the agent particles of filament elongation increase and are dispersed in the sea consisting of polyester resin, and the fusion of island-type mixture in a sea is extruded through a row, and in the collection step, the currents of Extruded filaments are tensioned and cooled, to form a strand of polyester filaments. During cooling, the filament elongation increase agent particles pass from a molten state to a glass state prior to the transition of the polyester resin, and therefore serve predominantly as a material resistant to elongation-deformation of the current filaments extruded due to the tension of the melt spinning. Due to this fact, the elongation viscosity of the mixture melt located near the spinneret in the polymer high temperature state does not follow the common elongation viscosity formula, and a non-linear increase in viscosity develops. This non-linear increase in viscosity is considered as promoting thinning of the filament yarn and melting side at a point upstream closer to the spinneret and to allow the speed of the melt spinning filament yarn to reach the final spinning speed from it, to an earlier stage of a spinning line. In other words, the thinning of these filament yarns of the present invention is completed at a melt-spun filament yarn path location upstream of the location at which the thinning of a filament yarn is carried out. polyester that does not contain a filament elongation and melt spinning increase agent at the same speed as mentioned above. Likewise, the meltblown filament yarn of the present invention does not have a thinning behavior in the form of a neck phenomenon whose thinning is frequently observed at a collection speed of 4,000 to 5,000 m / minute and is accompanied by a crystallization of the polyester resin. From this fact, it is clear that the use of the specific filament elongation-increasing agent in the present invention allows the realization of a high-speed melt spinning from the polyester filament yarn under a low tension, the performance The winding of the resulting polyester filament yarn can be improved, and a polyester filament yarn having a satisfactory residual elongation can be produced.

The polyester filament yarn of the present invention is produced by melt spinning a mixture of a polyester resin with particles of an agent that improves filament elongation in an amount of 0.5 to 4%, based on the weight of the polyester resin and collecting the yarn from melt spun polyester filaments at a temperature of 2,500 to 8,000 m / minute. The polyester filament yarn of the present invention exhibits an increase (I) in residual elongation of 50% or more compared to that usually obtained for the extruded filament polymer determined in accordance with equation (1): (%) = ((EIb / ELo) - 1) x 100 (1) In equation (1) I represents the increase of the residual elongation as a percentage of the polyester filament yarn, EIb represents a residual elongation as a percentage of the yarn of polyester filaments and EL0 represents a residual elongation as a percentage of a comparative polyester filament yarn produced by the same procedures as those indicated for the polyester filament yarn except that no filament elongation increase agent is found in the comparative polyester filament yarn. The requirements (a), (b), and (c) that characterize the present invention will be explained below.

Requirement (a) Taking into account the function of the elongation-deformation resistant material due to melt spinning tension, the filament elongation increase agent passes from a melting state to a glass state before the transition of the polyester polymer matrix during the thinning process of a melt extruded filament stream. For this requirement, the filament elongation increase agent of the present invention must have a thermal deformation temperature (T) from 105 to 130 ° C, preferably from 110 to 130 ° C.

Usually, the polyester resin has a thermal deformation temperature of about 70 ° C, and therefore the thermal deformation temperature of the filament elongation increase agent of the present invention is from about 35 ° C to about 60 ° C above. of the thermal deformation temperature of the polymer resin. Thus, during the melt-spinning process, the particles of the filament elongation-increasing agent moreover support the tension by melt spinning and concentrate in a relatively deep inner portion of each extruded stream of filaments that is thinning. Accordingly, the number of particles exposed to the peripheral surface of each constituent filament of the resulting polyester filament yarn decreases and, consequently, the winding performance is significantly improved. When the thermal deformation temperature (T) is less than 105 ° C, the resulting particles of the filament elongation increase agent exhibit a malfunction, as a material resistant against elongation-deformation of the filament yarn, namely, put that the difference in thermal deformation temperature (T) between the filament elongation increase agent and the polyester resin matrix is too small, the particles of the filament elongation increase agent can not serve as a material that satisfactorily supports stress while a large number of the particles are exposed to the surface of each filament to cause the filament surface to have a decreased coefficient of friction, and consequently the winding performance of the resulting filament yarn is significantly deteriorated . Also, when the thermal deformation temperature is greater than 130 ° C, the agent particles which increase the resulting filament elongation have too high a resistance to the elongation-deformation of each extruded filament stream. As a result, the resulting polyester filament yarn shows excessive residual elongation; the mechanical strength of the polyester filament yarn becomes lower than a satisfactory level for practical use; The particles of the filament elongation increase agent have a lower thinning property (elongation) than that of the polyester resin during the thinning process of a melt extruded filament stream and consequently, in general, the resin mixture of polyester containing the filament elongation increase agent exhibits an unsatisfactory filament-forming property and a stable melt-spinning operation can not be expected. In the following description, instead of the expression "filament elongation increase agent in the form of particles", the expression "material resistant against elongation-deformation" or "stress support material" can be used. Requirement (b) In the present invention, the requirement (b) is very important to obtain both a satisfactory winding performance and a high elongation of the resulting filament yarn. As mentioned above, the stress support material in each stream of filament thinning polymers tends to concentrate in the inner portion of the polymer stream in the form of filaments. Likewise, it is considered that when the tension support material is present in the surface portion of the polymer stream in the form of filaments, the stress-bearing material is cooled at a higher cooling rate than is the case of the polymer In the extruded filament stream itself, as a result, the extruded filament stream has an increased elongation viscosity, and, consequently, the stress support effect can be presented with high efficiency. However, when the material carrying the particle tension is located on the peripheral surface of each filament, the surface of the filament is uneven, and the coefficient of friction between individual filaments decreases. Accordingly, the resulting filament yarn exhibits a very unsatisfactory winding performance, and consequently a filament yarn having both an improved winding performance and a high elongation can not be obtained. According to the present invention, the distribution of the filament elongation enhancing particles in each filament is limited in such a way that while the particles are allowed to be located near the peripheral surfaces of the filament, and, in addition, the density The distribution of the particles exposed to the peripheral surface of the filament is limited as much as possible. That is, in the polyester filament yarn of the present invention, the filament elongation increase agent distributed in each filament must comply with requirement (b). As for the requirement (b), when a modality of the polyester filament of the present invention is, as shown in Figure 1, in the form of a non-hollow circular filament and has a cross-section surrounded by an outermost contour circular 1, and provided that the cross section of the circular non-hollow polyester filament is divided into 3 areas, that is, an outer ring-shaped area C defined between a circular outer contour pair 1 and intermediate contour 3, a intermediate ring-shaped area B defined between a concentric circular intermediate contour pair 3 and inner contour 5, and an internal circular area A surrounded by the internal circular contour 5, and provided that the radius of the internal circular contour 5 has a substantially radius equal to 1/3 of the radius r of the outermost circular contour 1, and the intermediate circular contour 3 has a radius substantially equal to 2/3 of the radius r of the circular contour m s external one, the density of particle distribution enhancement agent filament elongation in the polyester filament is optimized in the area shaped intermediate ring B. As the magnitude of this state optimized, it is preferable that at least 50%, by weight, of the total amount of filament elongation increase agent dispersed in each filament is exposed in the area In the non-hollow circular polyester filament for the polyester filament yarn of In the present invention, there is shown in Figure 2 a relationship between the distribution density of the agent particles that increase the filament elongation and the distance from the center point 0 of the cross section of the filament, in Figure 2, the density of distribution of the agent particles that increase filament elongation is optimized in the intermediate area B which is defined between an intermediate circular contour having a radius of 2/3 r and an internal circular contour having a radius of 1/3 r . In another embodiment, when the polyester filament, as shown in Figure 3, is a non-hollow trilobal filament shape and has a cross section surrounded by an outermost trilobal contour 1 ', a straight line OP, is drawn between the center point O and one upper end point P of each lobe, and another straight line Mi - M2 is plotted at right angles relative to the straight line OP through a center point O 'of the straight line OP. In addition along the straight line Mi - M2, each lobe is divided into 6 areas C, B ', A', A ", B", and C "in parallel with the straight line OP, and the widths of the areas C, B ', A', A ". B ", and C" are equal among them. And when the length of the straight line Mi - M2 is represented by 2L, each of the areas C ', B', A ', A ", B", C ", has a width of 1 / 3L, and total width of the areas B'and A'es 2 / 3L The distribution density, which occurs in the present invention, of the filament elongation increase agent particles is optimized in the intermediate areas B'y B ", as shown in figure 4. In the graph illustrated in figure 4, the curve showing the relationship between the distance from the center point O'de the straight line Mi - M2 and the density distribution of the particles has two peaks located in intermediate areas B'and B ". In addition, in another additional embodiment, the polyester filament, as shown in Figure 5, is a hollow circular filament shape and has a hollow circular cross section defined by a pair of outermost circular contour 11 and circular innermost contour 12. In figure 5, a line is drawn straight that passes through a point of center O of the outermost circular contour 11 and inner circular contour 12 concentric. This straight line cuts the outermost contour 11 at a point Mi and the innermost contour 12 at a point M2. The straight line Mi - M2 has a center point O '. That is, the length Mi - O 'is equal to the length M2 - 0'. A half circle 22 is traced through the center point 0 'around the center point 0.

The middle circle 22 is concentric in relation to the outermost circular contours 11 and innermost 12. Provided that the hollow circular cross section of the polyester filament is divided into 6 ring-shaped areas, i.e. a ring-shaped area outermost C "defined between a concentric circular outermost contour pair 11 and a first intermediate contour 14, a first intermediate ring-shaped area B" defined between a pair of first intermediate contour 14 and first concentric circular internal contour 16, one first internal ring-shaped area A "defined between a pair of first internal contour 12 and middle circle 22 concentric circular, a second area A 'in the form of an internal ring defined between the concentric middle circle 22 and a second internal contour 18, a second area B 'in the form of an intermediate ring defined between a pair of second internal contour 18 and a second intermediate contour 20 concentric circular, and an innermost ring-shaped area C 'defined between a pair of second intermediate contour 20 and innermost contour 12 circular concentric, and provided that the widths of the areas C, B', A ', A ", B", and C "are substantially equal therebetween, the distribution density, according to the present invention, of the filament elongation increase agent particles in the hollow circular polyester filament is optimized in the first B'-shaped area. intermediate ring and the second area B "in the form of an intermediate ring. Contrary to the foregoing, when the filament elongation increase agent particles are distributed at the highest distribution density in the inner area A of a non-hollow polyester filament as shown in Figure 1 or in the internal areas A 'and A "of a hollow polyester filament as shown in Figure 5, the resulting polyester filament yarn exhibits an unsatisfactory elongation.Since, when the filament elongation increase agent particles are distributed in the highest distribution density in the outer area C of a non-hollow polyester filament as shown in Figure 1 or in the outermost C "area and / or the innermost area C of a hollow circular polyester filament as shown in Figure 5, the surface portions of the resulting outer area C of the non-hollow polyester filament and the resulting outermost area C "and / or innermost area C'de The hollow polyester filament has a too high apparent elongation viscosity. This causes, in the non-hollow polyester filament, a core-coating structure which is unacceptable for subsequent processing. Also, in the hollow polyester filament, there is a coating-core-coating structure. Also, a larger portion of the particles of the filament elongation increase agent is exposed to the outer surface of the non-hollow polyester filament or on the outer and inner surfaces of the hollow polyester filament, and the winding performance of the yarn. The resultant polyester filament deteriorates, even when the yarn exhibits a satisfactory residual elongation. Likewise, the resulting polyester filament yarn exhibits reduced mechanical strength, and unsatisfactory process performance in subsequent processing. Also, the initial resistance to the yield point of the resulting polyester filament yarn will probably be decreased in a color application operation, and, accordingly, a woven or finished knitted fabric produced from the polyester filament yarn shows a insufficient volume and unsatisfactory texture. Requirement (c) In the requirement (c) the number (N) of the filament elongation increase agent particles that appear on the peripheral surface of the individual filaments constituting the yarn of the present invention should be 15 particles / lOOmeters square or less, preferably 10 particles / 100 μm or less. In this feature, the number of the filament elongation enhancing agent particles exposed to the peripheral surface of the individual filaments constituting the yarn of the present invention is limited to a small number of 15 or less per 100 square meters of the surface peripheral. When the number of particles (N) is greater than 15 particles / 100 μm, the peripheral surface of the resultant filament has a significantly decreased coefficient of friction, and consequently, the resultant polyester filament yarn formed of said filaments exhibits a performance of unsatisfactory rolled Also, since the agent particles that increase the filament elongation are different in terms of their coloration properties of the polyester resin, the particles exposed to a number N of particles greater than 15 particles / 100 μm square to the peripheral surface of the filament causes the surface of the colored filament to show a significantly uneven character in terms of color tone and / or color density, and the woven or spun fabric thus finished comprising the dyed filament yarn exhibits an unsatisfactory quality. And, likewise, when the filament elongation increase agent particles having a high thermal deformation temperature cover the peripheral surfaces of the individual filaments of a density of more than 15 particles / 100 square meters in the polyester filament yarn , the preheating efficiency decreases in thermal processing, for example, a stretching process in heat, in this process a uniform stretching is no longer expected and also undesirable fluffs are generated in the yarn. The polyester filament yarn of the present invention meets the requirements (a), (b), and (c) and has a high resistance to lint formation and filament or thread breakage during subsequent processes and can be stably wound around a roller or spool in order to form a yarn presentation while maintaining the ultimate elongation of the yarn at a high level. In relation to the requirements (a), (b), and (c) above, the sizes of the filament elongation increase agent particles distributed in the polyester filament in the longitudinal and transverse directions of the filament are limited to a certain magnitude. The sizes of the particles will be explained below.Average size (D) of filament elongation increase agent particles in the filament cross direction The average size (D) of the filament elongation increase agent particles in the transverse direction of the polyester filament shows a result of the contribution of the filament elongation increase agent to the stress support function exerted on the filament during the thinning process of a melt extruded filament stream. In the polyester filament yarn of the present invention, the average size (D) of the filament elongation increase agent particles determined in the transverse direction of the filament is generally 0.05 to 0.15 μm, more preferably 0.07 to 0.13μm. When the average size (D) is less than 0.05μm, the resulting particles may not be large enough to serve as tensile support particles during the thinning process of a melt extruded filament stream, and therefore may present a insufficient effect on the improvement of the residual elongation of the resulting filament yarn. Likewise, the resulting small particles can be easily and superiorly exposed to the peripheral surface of the filament to cause the peripheral surface to be rough. And, consequently, the coefficient of friction of the resulting filament surface may decrease and the resulting filament yarn may present an unsatisfactory winding property. Likewise, when the average size (D) is greater than 0.15μm, the particles may have a reduced dispersion property in the polyester resin matrix and are distributed in the extruded filamentary stream to cause the melt spinning tension is unevenly distributed in the cross section of the extruded filamentous stream. This local distribution of the melt spinning tension causes a regular spinning tension which, in turn, causes the spinning filament yarn to spin, and at each spinning hole in which the particles are unevenly distributed in the polymer melt, the melt viscosity and cut stress of the irregularly mixed melt of the polymer with the particles fluctuate and the flow of the mixed melt is disordered. Therefore, in this case, stable melt spinning can not be expected. L / D ratio of filament elongation increase agent particles distributed in the polyester filament In the polyester filament yarn of the present invention, the filament elongation increase agent particles serve as tension bearing particles during the thinning process of the melt extruded filamentary stream, and consequently the particles are elongated and oriented in the longitudinal length of the filament. In the polyester filament yarn of the present invention, the filament elongation increase agent particles distributed in the filament preferably have an L / D ratio of 20 or less, more preferably from 5 to 12, where L represents an average length of the particles as determined in the filament length direction, and D represents the average particle size determined in the transverse direction of the filament, as explained above. When the L / D ratio is greater than 20, this high ratio can be derived from the fact that the particles of the filament elongation increase agent are deformed under a melt spinning tension, while being accompanied by the deformation of polyester resin , and accordingly, the location at which the thinning of the melt-spun filament yarn is complete may not be displaced near the spinneret, and the filament elongation-increasing agent may not satisfactorily increase the residual elongation property of the yarn. resultant polyester filaments. Apart from the above in the polyester filament yarn of the present invention, there is a relationship between the increase in residual elongation (I) of 50% or more and the bi-refringency of the polyester filament yarn. The bi-refringency (delta n) polyester filament yarn of the present invention is preferably within the range of 0.015 to 0.105, more preferably 0.03 to 0.070. In the polyester filament yarn of the present invention produced at a collection speed of 2500 to 8000 m / minute, when the bi-refringency (delta n) is less than 0.015 the resulting polyester filament yarn can be disadvantageous in the as the properties of the polyester filament yarn change easily with the passage of time, and consequently the stretching property is easily deteriorated. Accordingly, it is likely that the individual filaments are frequently broken in the subsequent stretching operation, which causes the difficulty to carry out said operation under stable conditions. Also, when the bi-refringency (delta n) is greater than 0.105, since the residual elongation of the resultant polyester filament yarn can be low and therefore the maximum stretch ratio of the melt spun yarn can approach the 1.0 volume the resulting polyester filament yarn is not suitable for various yarn processing. In addition, the high bi-refraction meltblown polyester filament yarn may be suitable, as high-speed meltblown filament yarn, instead of drawn yarns obtained under a separate drawing system or a coupled spinning system. and high speed stretching for the production of woven or knitted fabrics. When the bi-refringency (delta n) is within the range of 0.013 to 0.070, the resulting polyester filament yarn can exhibit high residual elongation and excellent processing performance. The polyester resin that can be employed for the present invention includes polyesters that form filaments in which at least one aromatic bicarboxylic acid is contained as an acid component. For example, the polyester resin comprises at least one member selected from polyethylene terephthalate resins, polytrimethylene terephthalate resins, polytetramethylene terephthalate resins, polycyclohexanedimethylene terephthalate resins, and polyethylene-2,6-naphthalene dicarboxylate resins. . These polyester resins can be modified by copolymerization with, as a third element, a diol compound, for example, butanediol, and / or a dicarboxylic acid, for example, isophthalic acid. Likewise, the aforementioned polyester resins can be used alone or in a mixture of two or more of them. Among these polyester resins, polyethylene terephthalate resins are more preferably used for the present invention. The polyester resin for the present invention contains an additive comprising at least one member selected for dyeing agents, thermal stabilizers, ultraviolet ray absorbers, antistatic agents, end group terminating agents and fluorescent gloss agents. Taking into account the melting property of the polyester resins and the physical properties of the polyester filament yarn, the polyester resin preferably has an intrinsic viscosity of 0.4 to 1.1, as determined in O-chlorophenol at a temperature of 35 ° C. The filament elongation increase agent which can be employed for the present invention comprises at least one polymeric material produced by an addition polymerization of at least one unsaturated monomer, especially an ethylenically unsaturated monomer, and substantially incompatible with the polyester resin. The filament elongation increase agent has a thermal deformation temperature (T) of 105 to 130 ° C, preferably from 110 to 130 ° C, in accordance with what is mentioned above. The filament elongation increase agent preferably comprises at least one member selected from acrylonitrile-styrene copolymers, acrylonitrile-butadiene-styrene copolymers, polytetrafluoroethylene copolymers, high density polyethylenes, low density polyethylenes, straight linear low density polyethylenes. , polystyrenes, polypropylenes, polymethylpentenes, polyacrylate ester resins, polymethyl methacrylate resins, as well as derivatives of the polymers mentioned above. These polymers for the filament elongation increase agent are necessary, according to the polyester resin, to present a sufficiently high visco-elasticity structure to serve as a high tensile strength molecular material during the thinning process of an extruded filamentous stream. in fusion. Thus, the filament elongation increase agent has a high molecular weight. That is, the filament elongation increase agent preferably has a weight average molecular weight of 2000 or more, more preferably from 2,000 to 200,000, and preferably still greater than 8,000 to 150,000. When the molecular weight is less than 2,000, the resulting filament elongation increase agent may not exhibit a sufficiently high structural viscoelasticity to serve as a high tensile strength molecular material. Also, when the molecular weight is greater than 200,000, the resulting polymer may have too high a cohesion energy and therefore the melt viscosity of the polymer may be too high for the polyester resin. Accordingly, the resultant filament elongation enhancing agent particles can be very difficult to disperse regularly in the polyester resin matrix, and therefore the melt blending of the polyester resin and the elongation enhancement agent particles of filament may have a significantly reduced filament formation property and the resulting filament yarn may be difficult to roll up smoothly. In addition, the resultant filament elongation increase particles may have a significant negative effect on the polyester resin and it may be impossible to obtain the polyester filament yarn having satisfactory physical properties. When the weight average molecular weight is within a range of 8,000 to 150,000, the resulting filament elongation increase agent exhibits increased thermal resistance and is therefore very useful for the present invention. The addition polymerization product which can be employed for the filament elongation increase agent is preferably selected from methyl methacrylate copolymers and isotactic styrene polymers each having a weight average molecular weight of 8,000 to 200,000 and a Fusion (MI) of 0.5 to 15.0 g / 10 minutes determined in accordance with Japanese Industrial Standard (JIS) D 1238 at a temperature of 230 ° C lowers a load of 3.8 kgf, ethylpentene polymers and derivatives thereof having a weight average molecular weight of 8,000 to 200,000 and a melt index (MI) of 5.0 to 40.0 g / 10 minutes determined in accordance with JIS D 1238 at a temperature of 260 ° C under a load of 5.0 kgf, and styrene polymers syndiotactic (crystalline) and derivatives thereof having a weight average molecular weight of 8,000 to 200,000, and a melt index (MI) of 6.0 to 25.0 g / lOminutes as determined in accordance with with JIS D 1238 at a temperature of 300 ° C under a load of 2.16 kgf. The aforementioned polymers have excellent thermal stability and dispersion property in the polyester resin matrix, at a melt spinning temperature for the polyester resin blend. In a polyester filament yarn embodiment of the present invention, the polymerization product by addition of the unsaturated organic monomer comprises an acrylate polymer comprising, as a main component, an addition-polymerized methyl methacrylate having a number average molecular weight of 8,000 to 200,000 and a melt index of 0.5. at 8.0 g / 10 minutes, as determined at a temperature of 230 ° C under a load of 3.8 kg. In another embodiment of the polyester filament yarn, the polymerization product by addition of the unsaturated organic monomer comprises a styrene polymer comprising, as a main component, an isotactic styrene polymer and having a number average molecular weight of 8,000 to 200,000. and a melt index of 0.5 to 8.0 g / 10 minutes, as determined at a temperature of 230 ° C under a load of 3.8 kg. In another embodiment of the polyether filament yarn, the polymerization product by addition of the unsaturated organic monomer comprises a styrene polymer comprising, as a main component, a syndiotactic (crystalline) styrene polymer and having a number average molecular weight of 8,000. at 200,000 and a melt index of 6 to 2.5 g / 10 minutes, as determined at a temperature of 300 ° C under a load of 2.16 kg. In a further embodiment of the polyester filament yarn, the product of the polymerization by addition of the unsaturated organic monomer comprises a methylpentene polymer comprising, as principal, a 4-methylpentene-1 polymerized by addition and having an average number-average molecular weight. from 8,000 to 200,000 and a melt index of 5.0 to 40.0 g / 10 minutes as determined at a temperature of 230 ° C under a load of 5.0 kg. The process of the present invention for the production of the polyester filament yarn in accordance with that mentioned above will be explained below.

To obtain the polyester filament yarn of the present invention having the excellent rolling performance and a high residual elongation, the process for the production of the polyester filament yarn comprises, as important steps, a specific filtering process for the melting of the polyester resin mixture and the filament elongation increase agent particles under a specific tensioning process for the melt spun filament yarn. In the process of the present invention, a blend of the mescal of a polyester resin and particles of a filament elongation increase agent in an amount of 0.5 to 4.0%, by weight, based on the weight of the resin of The polyester is melt extruded through a spinneret, and the melt extruded polyester filament yarn is collected at a speed of 2,500 to 8,000 m / min. In this process it is important that in the melt extrusion step, the melt passes through a filter having a pore size of 40 μm or less and placed upstream of the spinneret, and in the spinning line, an apparent tension of melt extruded polyester filament yarn is controlled within a range of 150 to 1,500. When the pore size of the filter is greater than 40um, the filtered melt mixture can include coarse particles and therefore can not be stably melted. Also, when the coarse particles are exposed to the peripheral surface of the filament, and the resulting filament surface is rough, the resulting filament yarn may exhibit an unsatisfactory coiling performance. Likewise, the collection step can be carried out under a tension of 150 to 1,500 and at a speed of 2,500 to 8,000 m / minute. When the tension is less than 150, that is, the size of the melt spin hole is small, a high cutting force is applied to the polymer melt which passes through the melt spin hole, and therefore, the Elongated filament elongation increase agent particles elongated in the longitudinal direction of the melt stream of polymers are broken due to the action of the cutting force. Thus, the average size (D) of the particles in the transverse direction can be less than 0.005μm. consequently, the particles of the filament elongation increase agent may have an unsatisfactory elongation increase effect on the filament, ie, the particles do not exhibit a satisfactory tension support effect in the melt spun filament, the frequency of exposure of the particles to the peripheral surface of the filament, and the resulting polyester filament yarn exhibits unsatisfactory winding performance.

Likewise, when the tension is greater than 1500, the breaking effect on the filament elongation increase agent particles by the cutting force applied to the particles during their passage through the melting spin hole is low. and the residual elongation of the meltblown filament yarn improves significantly. However, significant tensioning greater than 1,500 causes thick particles to be generated and the coarse particles in turn cause the winding property of the resulting filament yarn to become unsatisfactory. Accordingly, when the tensioning is within the range of 150 to 1,500, the distribution of the filament elongation increase agent particles in the resulting polyester filament can satisfy the requirement (b) of the present invention, as shown , for example in FIG. 2 for the non-hollow circular filament or in FIG. 4 for the non-hollow trilobal filament. That is, the distribution density of the filament elongation increase agent particles is optimized clearly in the intermediate area B or B'y B ", and the melt spinning process can be achieved smoothly in a stable condition. When the process of the present invention is carried out, the particles of the filament elongation increase agent are elongated in the longitudinal direction of the filament and thinned, while supporting the melt spinning tension, to decrease the particle size in the direction transverse to 0.05 to 0.15um. during the melt spinning process with the tension from 150 to 1,500, the filament elongation increase agent particles, which are distributed in a regular manner throughout the melt extruded filamentary stream in the initial stage of the spinning process in fusion, are concentrated in the intermediate area or in the intermediate areas of the filament according to the above mentioned. This specific local distribution of the filament elongation increase agent particles in the extruded filamentous stream causes the resultant polyester filament yarn to exhibit both satisfactory residual elongation and improved coiling performance. In the process of the present invention, the melt spinning temperature (which is identical to the spinneret temperature) and the cooling of the melt extruded filamentary stream at a low to high current location relative to the spinneret are preferably controlled . As for the melt spinning temperature, it is preferred that the die temperature for the melt blending of the polyester resin and the filament elongation increase agent particles dispersed in the polyester resin matrix are maintained at a level lower than the spinneret temperature for conventional polyester resins free from melt filament elongation agent particles, in order to ensure a significant increase in residual elongation and a good stable rolling performance of the filament yarn resulting. These advantages derive from the phenomenon that, after passing through the spinneret, the filament elongation increase agent particles exhibit a high elongation viscosity in a portion upstream of the filament yarn and melt side path, and serve as a melt spinning tension support agent. As a result, the melt spinning tension of the filament yarn decreases significantly, and, a specific area as previously explained several times, where the filament elongation increase agent particles are distributed at a maximum distribution density, is formed and It is fixed in the filament and the do in fusion. In the process of the present invention, the temperature of the spinneret is preferably 270 to 790 ° C, more preferably 275 to 285 ° C, when the polyester resin consists essentially of ethylene terephthalate units, in this case When the spinneret temperature is less than 270 ° C, the resultant melting polyester resin mixture may have insufficient filament-forming property, and when the spinneret temperature is higher than 290 ° C, the spin agent Increased filament elongation may exhibit insufficient thermal stability in the molten polyester resin. The cooling of the extruded filamentary stream in a stream-to-stream melt is preferably carried out by blowing cooling air at a controlled blowing speed within a range of 15 to 0.6 m / second in the transverse direction of the same, in order to increase both the residual elongation and the rolling performance of the resulting polyester filament yarn. When the air blowing speed is less than 0.15 m / second, the resulting filament yarn is uneven in terms of its quality and consequently in the subsequent processing a processed filament yarn can not be obtained, for example, a stretched filament yarn or a textured yarn having a good quality as well, when the air blowing speed is greater than 0.6 m / second, the elongation viscosity of the molten polyester resin of the extruded filamentous stream in melting can be increased and therefore an increase in the residual elongation of the resulting filament yarn can not be expected. The addition of the filament elongation increase agent particles to the polyester resin can be achieved by conventional methods. For example, during the polymerization process of the polyester resin, the particles are mixed with a polyester resin in a final stage of the polymerization process. In another method, the polyester resin and the filament elongation increase agent particles are melted and mixed together, the resulting melt mixture is extruded cooled and cut to form flakes (or pellets) of the mixture. In another method, a fused polyester resin is fed through a main duct, and a melt of the filament elongation increase agent is also fed through a side duct connected to the main duct, both in a spinning block after passing through a dynamic and / or static mixer. In another method, the polyester resin and the filament elongation enhancing agent both in the form of chips are mixed together, and the mixture is fed into a spinneret. Among these methods, a method in which a portion of the fused polyester resin charged to a feed line directly connected to a spinning block is removed in the path and is melt-mixed with the feed agent particles is especially preferred. Increasing filament elongation in order to disperse them in the molten polyester resin, the resulting melt mixture is returned to the feed line through a dynamic and / or static mixer, and then subjected to melt spinning. In the process of the present invention, since a lower stress is exerted on the polymer portion in the extruded filamentous stream while the filament elongation increase agent particles in the mixture function as a tension support element, it can be produced a strand of polyester filaments having an extremely small thickness of 1.11 dtex per filament (1.0 denier) or less, at high collection speed. Generally speaking, in the production of a polyester filament yarn in which the individual filament thickness is extremely small, since the cooling of the melt extruded filamentary stream is achieved at very high speed, and an air resistance by Unitary cross-sectional area of the filament yarn, occurring in an upstream location of a first recovery roller is high, the production efficiency of the extremely fine filaments at high recovery speed is low and the production yield is very unsatisfactory. However, when the specific polyester resin mixture of the present invention is employed, the improvement of the cooling effect due to the decrease in thickness of individual filament causes the promotion of the orientation and effect of crystallization obstruction and this effect is helpful. for the production of extremely fine filaments and allows the production of them at high speed. The aforementioned melt-spinning method of the present invention can be applied not only to the production of the polyester filament yarn of type as it leaves the spinneret alone, but also the production of other types of filament yarns. For example, by the combined melt extrusion (coiling) of a polyester resin mixture containing the filament elongation increase agent particles and a polyester resin that substantially does not contain any filament elongation increase agent particle. independently through a common row, a mixed unstretched polyester filament yarn having elongation properties similar to those of a mixed unstretched polyester filament yarn as produced by bending yarn non-stretched polyester filaments of two types separately collected at different recovery speeds and therefore different in terms of the final elongation between them. In the conventional co-melt spinning method, a single melt polyester resin is extruded through a spinneret having two types of spinning holes extremely different in relation to their diameter therebetween. In this case, the recovery speed must be controlled at a low level of about 1,500 m / minute in order to obtain a melt spun polyester filament yarn having a high residual elongation, for example, a high final elongation of 270 to 340%. In comparison with this, when the melt polyester resin mixture containing the filament elongation increase agent particles and the melt polyester resin substantially free of the particles are extruded independently through the common die, the yarn The resulting mixed polyester filament can be collected and wound at a high recovery rate at which the polyester filament yarn produced from the polyester resin free from the filament elongation increase agent and having a low residual elongation desired can be collected. Accordingly, the confound spinning method of this type contributes to improving the productivity of the mixed polyester filament yarn consisting of two types of polyester filament yarns different in their residual elongation therebetween and can be usefully employed as yarn of material for a bulky twisted false yarn of core type in wrapping presented, for example, in U.S. Patent No. 2,013,746 (corresponding to JP-B-61-19, 733). That is, when the above-mentioned material yarn is subjected to a false twisting process-simultaneous stretching in accordance with the method presented in the aforementioned US patent, a high drawing ratio can be applied on the material yarn., and consequently, the resulting yarn and the falsely twisted yarn can be recovered and wound up at an increased speed in order to improve the productivity of the processed yarn. The melt spinning process of the present invention can be preferably combined with a conventional sequential melt spinning and drawing process. Particularly, when a high speed / high performance winding is employed whereby a high winding speed (peripheral speed) of 8,000 m / minute or more can be realized, the polyester filament yarn can be collected by retrieval roller Gl (which serves as a preheating roller and is known as a first recovery roller), at a recovery speed of 5,000 to 6,000 m / minute, and then is stretched and heat-set by a thermal and stretched fixing roller (G2) that It is known as the second recovery roller at a speed of 7,000 to 9,000 m / minute. Also, the melt spinning process of the present invention can be used for an energy-saving polyester filament yarn production process in which the first recovery roll (Gl) is driven at a speed of 7,000 to 8,000 m. / minute, after the filamentous thread is cold drawn by the second recovery roller (G2) at a speed ratio (G2 / G?) between the second recovery roller (G2) and the first recovery roller (Gl) of 1.10 to 1.25 at its highest level, the filament yarn passes through a steam chamber for removing the residual voltage of filament yarn and to heat set said yarn, and then yarn is wound filaments thermoset. EXAMPLES The present invention will be further illustrated through the following examples. In the examples, the following tests were applied to the resultant polyester filament yarns. (1) Thermal deformation temperature (T) The thermal deformation temperature of the polyester filament yarn was measured in accordance with ASTM D-648. (2) Average size (D) of filament elongation increase agent particles in the transverse direction A sample of the spun filament yarn was integrated into a paraffin matrix, and was cut at right angles in relation to the longitudinal axis of the wire to prepare samples that had a thickness of 7μm for observation through electron microscopy by means of an electron microscope (model: JSM-840, manufactured by NIPPON DENSHI KK). Several samples were placed on a stage and left in toluene at room temperature for 2 days. During this treatment, the particles of the filament elongation increase agent consisting of a polymerization product by the addition of an unsaturated monomer were dissolved in toluene and removed from the samples. In the resulting samples, platinum was deposited by electron deposition at 10 mA for 2 minutes, and the samples that received platinum were photographed with an amplification of 15,000. In the resulting photograph, cross-sectional areas of 200 traces of particles were measured by a curve meter area (manufactured by K.K. USHIKATA SHOKAI) and the average size of the traces in the transverse direction of the filament yarn was calculated. The resulting average size represents the average particle size (D) of the filament elongation increase agent particles in the transverse direction. (3) Average size (L) of filament elongation increase agent particles in the longitudinal direction and a L / D ratio A sample of the filament yarn and melt side was integrated into a paraffin matrix and cut to cut individual filaments along the longitudinal axis of each filament in order to prepare samples for electron microscopic observation. Several samples were placed on a glass slide and were left in toluene at room temperature for two days in order to dissolve the agent particles increase elongation filament in toluene and platinum on the surfaces of cut filaments resulting was deposited by same procedures as those presented above. The samples that received platinum were photographed with an amplification of 15, 000 in the photograph, the lengths of 200 fingerprints of the particles were measured by means of the same area curve meter as mentioned above, and the average length of the fingerprints in the longitudinal direction was calculated. The average length of the particles (L) in the longitudinal direction is represented by the average length of the tracks. Likewise, the L / D ratio is represented by the ratio between the average length of the beads in the longitudinal direction and the average size of the traces in the transverse direction. (4) Distribution of filament elongation increase agent particles in cross section of polyester filament Twenty cross sections of non-hollow circular polyester filament were photographed in the same manner as mentioned above. In each photograph the circular cross section of the filament was divided into 3 concentric areas, that is, an internal circular area surrounded by an internal contour having a radius corresponding to 1/3 of the radius of the outer circular contour of the cross section, intermediate ring-shaped area defined between the inner contour and an intermediate circular contour having a radius corresponding to 2/3 of the radius of the outer circular contour and an outer ring-shaped area defined between the intermediate circular contour and the circular contour external. The number of traces of filament elongation increase agent particles in each area was counted, and a distribution density of the traces (the number of traces per unit area) in each area was calculated. The percentage of distribution density of the traces in each area was calculated with the average distribution density of the traces in the total cross section of the filament, the percentage of the distribution density of the filament elongation increase agent particles. in each area it is represented by the percentage of distribution density of the footprints in each area. (5) The number (N) of filament elongation increase agent particles that appear on the peripheral filament surface A polyester filament yarn consisting of a plurality of individual filaments was cut to a length of 10 mm, a Right angles in relation to the longitudinal axis of the filament thread. The cut filaments were placed on a glass slide and immersed in toluene at room temperature for two days in order to remove the filament elongation increase agent particles from the filaments. In the same way as mentioned in test (2), the surfaces of the filaments were photographed with an enlargement of 15,000. in the photograph, the number of fingerprints of the particles per 2000 μm2 was counted. From the counted number of the traces, the number of particles per 100 um2 of the filament surface was calculated. (6) Bi-refringency (delta n) of polyester filament yarn Interference fringes were measured on a polyester filament yarn by polarizing microscope using a penetration liquid consisting of 1-bromonaphthalene and a single color light with a wavelength of 530 nm. The bi-refringency (delta n) of the polyester filament yarn was calculated according to the following equation: Delta n = 530 (n + theta / 180) / X where n represents the number of interference fringes, theta represents an angle of rotation of a compensator and X represents the diameter of the filament. (7) Residual elongation A strand of polyester filaments and melted side was left in a room with high humidity and high temperature maintained at a temperature of 25 ° C at a relative humidity of 60% for 24 hours, then placed a sample of the thread of a measurement length of 100 mm in a tension tester (trademark: TENSILON, manufactured by KK SHIMAZU SEISAKUSHO) and a final elongation of the sample was measured at an elongation rate of 200 mm / minute; say at a tension speed of 2 mm "1.

The ultimate elongation represents the residual elongation of the filament yarn. (8) Melt index The melt index was measured in accordance with ASTM D-1238. (9) Tensile of apparent melt spinning (Df) In the melt spinning process of a polyester filament yarn, the melt extrusion rate in ml / min of an individual filament was calculated by dividing the amount of melt extrusion in g / min of the filament with a specific gravity in g / cm3 of the molten polyester resin, ie 1.2 g / cm2, the speed of The resulting extrusion in ml / minute was divided between the cross-sectional area of the melt extrusion orifice, in order to calculate the linear velocity of melt extrusion Vo. The Df is calculated from the speed of recovery (or winding) Vw of the filament yarn and the linear velocity of melt extrusion Vo according to the following equation: Df = Vw / Vo ' (10) Swath temperature Swath temperature was measured by inserting a temperature sensing end of a thermometer into a temperature measuring hole having a depth of 2 mm and formed from a surface portion of the spinneret, and measuring the temperature of the temperature measurement orifice, while the spinneret is in the conditions of melt spinning. (11) Cooling air blowing speed downstream in relation to the row An anemometer was placed at a location 30 cm from the upper end of a cooling air blowout vent with a honeycomb structure and adhered on the face of the honeycomb. The blowing speed of the cooling air was measured five times by the anemometer. The average of the measured values of the velocity of blown. (12) Coefficient of friction between filaments (coefficient of friction F / F) The coefficient of friction F / F is illustrated in detail in Japanese Unexamined Patent Publication No. 48-35112, and is a barometer of sliding property of the filaments between them.

A multiple filament yarn sample (Y) having a length of 690 m was wound helically around a cylinder with an external diameter of 5.1 cm and a length of 7.6 cm with a helix angle of ± 15 degrees under a Rolling load of 10 g, by the use of transverse movement. A sample (Yl) of the same multi-filament yarn sample mentioned above with a length of 30.5 cm was placed in the layer of wound yarn formed in the cylinder, in parallel with the winding direction of the yarn (Y). One end of the wire sample (Yi) was connected to a strain gauge of one friction tester and the other end of the wire sample (Yi) was loaded with a load of 0.04 times the weight corresponding to the denier thickness value of the wire sample (Yi). Then the cylinder that winds the thread (Y) is rotated at an angle of 180 degrees at a peripheral speed of 0.0016 cm / second. The tension was recorded continuously exerted on the wire sample (Yi).

The coefficient of friction F / F (f) is calculated by the following equation which is well known in terms of the friction of a band moving in a cylinder, f = (l / pi) ln (T2 / T1) where T2 represents an average peak tension of the yarn sample (Yi) measured 25 times, Ti represents a tension applied to the yarn sample (Yi) under a load of 0.04 times the weight corresponding to the denier thickness value of the yarn sample (Yi), ln is a sign of natural logarithm. When a non-reversible elongation of the yarn sample (Yi) was observed during the measurement, that is, when the yarn sample (Yi) was stretched, the yarn sample data was not used. The measurement temperature of the atmosphere was 25 ° C. (13) Oil recovery measurement method (OPU) A sample of filament yarn and melt side was dried at a temperature of 105 ° C for 2 hours, and then the weight (W) of the dried yarn was immediately measured. Then, the wire sample was immersed in 300 ml of an aqueous cleaning solution containing, as a main component, sodium alkylbenzene sulfonate, and was treated with ultrasonic waves at a temperature of 40 ° C for 10 minutes.

After the aqueous cleaning solution was removed, the cleaned wire sample was rinsed with a flow of hot water at a temperature of 40 ° C for 30 minutes, and then dried at room temperature. Subsequently, the yarn sample was further dried at a temperature of 105 ° C for 2 hours and immediately the weight (Wx) of the dried yarn sample was given. The oil recovery (OPU) of the wire sample was calculated according to the following equation: OPU (%) = ((W - W?) / W?) X 100 (14) The number of fluffs per m The number of lint that appears in a textured yarn produced by a false twist method and that has a length of 25 m or more was counted to the naked eye, and the number of lint per meter was calculated. Example 1-8 and comparison examples no. 1 to 6 In each of Examples 1 to 8 and Comparative Examples 1 to 6, a polyester filament yarn was produced through the following procedures. Polyethylene terephthalate resin flakes with an intrinsic viscosity of 0.64, as determined in 0-chlorophenol at a temperature of 35 ° C and containing a luster removal agent consisting of a titanium dioxide pigment in an amount of 0.3% based on the weight of the polyethylene terephthalate resin were dried at a temperature of 160 ° C for 5 hours and then melted in a single screw fusion extruder of Fullright type with an internal diameter of 25 mm at a temperature of 300 ° C. Separately, a filament elongation increase agent consisting of (A) a polymethyl methacrylate resin (PMMA- (A)) having a thermal deformation temperature (T) of 121 ° C, a melt index of 1.0 g / 10 minutes determined at a temperature of 230 ° C under a load of 8 kgf, a weight average molecular weight of 150,000, or (B) a polymethyl methacrylate resin (PMMA- (B)) that has a temperature of thermal deformation (T) of 98 ° C, a melt index of 2.5 g / 10 minutes as determined at a temperature of 230 ° C under a load of 3.8 kgf, and a weight average molecular weight of 60,000, or (C) a methyl methacrylate copolymer resin-acrylic imide-styrene addition product (molar ratio = 24: 45:30) (PMMA- (C)) having a thermal deformation temperature (T) of 140 ° C, a melt index of 0.6 g / 10 minutes in accordance with that determined at a temperature of 230 ° C under a load of 3.8 kgf, and a weight average molecular weight of 70,000, melted at a temperature of 250 ° C. The melt of the filament elongation increase agent was introduced in the amount illustrated in Table 1, via a side path, into the melt extruder and mixed into the melt of the polyester resin in the melt extruder. The resulting mixture was passed through a 20 step static mixer in order to disperse the filament elongation increase agent fusion in the form of a plurality of particles in a matrix consisting of the polyester resin melt. The melt mixture was filtered through a metal filament filter having a pore size of 25 μm, and then melt extruded through a spinneret immediately downstream in relation to the filter and equipped with 36 nozzles of melt spinning with a diameter of 0.4 mm and a flat surface length of 0.8 mm at a die temperature of 285 ° C, at a controlled extrusion rate in response to the rate of recovery as shown in Table 1. The extruded filamentary streams were cooled by blowing hot air in the transverse direction in relation to the longitudinal axis of the spinning line, at a blowing speed of 0.23 m / second, from a transverse blow cooling pipe. placed in a location of 9 to 100 cm below the row, in order to cool and solidify the extruded filamentary streams to provide the filament thread of polyester consisting of 36 filaments. The polyester filament yarn was oiled with an aqueous emulsion of an oily agent in a dry amount of 0.25 to 0.30% based on the weight of the filament yarn, and then recovered at the speed shown in table 1. In the In the aforementioned melt-spinning processes, the tension ratio (Vw / Vo) was 407. The resulting polyester filament yarn had a yarn count of 133.3 dtex (120 denier) / 36 filaments. The oily agent had the following composition. Oily agent (Fa) Component Content (% by weight) Random addition reaction product of butanol-PO / EO (50/50) Random addition reaction product 47 of glycerol-PO / EO (50/50) Sulfonate of alkyl (C12-C16) sodium 1.5 EO potassium (2) moles) - lauryl phosphate 1.5 (Note: PO ... oxypropylene group EO ... oxyethylene group) The aqueous oily agent emulsion had a dry content of 10% by weight and was applied to the filament yarn by the use of a oil nozzle. In the recovery step, the tension (immediately before a rolling presentation) remained within the range of 0.15 to 0.25 times the force corresponding to the denier thickness of the filament yarn. The recovered filament yarn was wound into a presentation having a yarn weight of 7 kg. The shape of the yarn presentation was evaluated at a glance in the following classes. Class presentation form 3 satisfactory 2 spider webs observed 1 a destruction of the presentation is observed The test results are shown in Tables 2 and 3 Table 1 Melt spinning Element speed of rolled filament elongation increase agent Ex. Do not . (m / min) type quantity (% by weight) Example 1 2000 (A) 1.5 example example 1 2500 (A) 1.5 2 3500 (A) 1.5 Ex. Comp. 2 4500 (A) 0.3 Example 3 4500 ( A) 0.5 4 4500 (A) 1.5 5 5500 (A) 1.5 6 5500 (A) 3.0 Comp. Example 3 5500 (A) 5.0 4 5500 (B) 3.0 5 5500 (C) 3.0 example 7 7000 (A) 1.5 8 8000 (A) 1.5 ex. Comp .. 6 8500 (A) 1.5 Table 2 Element of filament Elongation increase agent particles in individual filament Ex. No, D (*)? L / D (*) 2 percentage of density μm of distribution (%) area area internal interexternal internal area Ex. comp. 1 0.12 5 133 85 82 Example 1 0.095 10 97 115 88 2 0.076 14 95 119 86 Ex. comp. 2 0.065 15 89 121 90 Example 3 0.068 13 87 120 93 4 0.069 12 83 130 87 5 0.062 14 79 132 89 6 0.064 13 77 134 89 Ex. Comp. 3 0.070 14 90 125 85 4 0.047 23 110 111 79 5 0..165 8 76 124 100 Example 7 0, .060 18 91 117 92 8 0. .057 17 95 109 96 Ex. comp. 6 0. .055 20 91 105 104 Example No. the number (N) (*) 3 (particles / 100 μm2) Ex. comp. 1 16 Example 1 8 2 9 Ex. comp. 2 3 Example 3 4 4 8 5 10 ß 15 Ex. comp. 3 22 4 21 5 13 Example 7 12 8 14 Ex. comp. 6 18 Note: (*)] .. particle size r. > romedic 3 defer transverse direction (*) 2 average particle length in accordance with that determined in the longitudinal direction (*) 3 the number of particles that appear on the peripheral surface of the filament per lOOμm2 Table 3 Polyester filament thread element Dn (*) 4 resistance elongation increase form to the last tension of the pre-elongation seat-residual Ex. Do not . (g / of) (%) (%) Ex. comp. 1 0.0089 1.34 360 29 2 Example 1 0.0158 1.47 312 80 3 2 0.0270 1.95 212 93 3 Ex. comp. 2 0.0630 2.87 95 23 3 Example 3 0.0551 2.65 117 52 3 4 0.0452 2.50 158 106 3 5 0.0617 2.8 100 87 3 6 0.0487 2.2 143 167 3 E. comp. 3 0.0272 1.4 210 293 1 4 0.0563 2.3 113 113 2 Example 7 0.0714 3.2 80 74 3 8 0.103 3.6 60 71 3 Ex. comp. 6 0.135 2.6 48 48 K *) 6 Note: (*) < i • < , .. bi-refringency (*). * *, .. ruj.ituras de hilo (*) 6 ... observed ruptures of individual filaments Taking in what Tables 1, 2 and 3, the results of the examples and comparison examples are the following. In the low speed melt spinning polyester filament yarn produced in comparative example 1, since the tension speed of the filamentary stream extruded during the thinning process thereof is low, the elongation-deformation of the particles of filament elongation increase agent followed the elongation-deformation of the polyester resin matrix and therefore did not substantially serve as elongation-deformation resistant particles of the polyester resin matrix in the melt state. Accordingly, the effect of increasing the resulting elongation on the resulting polyester filament yarn is small. Also, in this case, since the number of particles exposed to the peripheral surfaces of the individual filaments is important, in the resulting yarn presentation the web formation of the filament yarn was observed. In the examples 1, 4, 7, 12 and 13, according to the present invention, all the requirements are met (a), (b), and (c) as well as with the winding speed of 2,500 to 8,000 m / minute, the residual elongation and rolling performance of the resulting polyester filament yarns are also met. Especially, in the recovery speed of 3,500 to 5,500 m / minute, the effect of the present invention is optimized. In the comparison example 6, since the tensioning speed of the filamentary stream extruded during the thinning process thereof is very high, it is considered that the filament formation property of the melt mixture is degraded due to the separation interfacial that occurs between the polyester resin matrix and the filament elongation increase agent particles. In comparison examples 2, since the amount of the filament elongation increase agent particles is too small, the filament elongation increase effect was unsatisfactory. In the comparison example 3, in which particles of filament elongation increase agent were used in too large an amount, the resulting increase in residual elongation of 293% was sufficient, but the number (N) of the particles exposed to the peripheral surfaces of the filaments is too large and the resulting yarn presentation was unsatisfactory. In Examples 3 and 6, according to the present invention the filament elongation increase agent particles were employed in an amount of 0.5 to 4.0% by weight, and therefore the particles were placed in the polyester resin matrix in a satisfactory condition. In the comparative example 4 in which the PMMA- (B) having a thermal deformation temperature (T) of 98 ° C which does not meet the requirement (a) of the present invention, was used, the resulting particle size ( D) in the transverse direction was less than 0.005um, the number (N) of the particles exposed to the peripheral surfaces of the filaments is greater than 15 particles per 100 square meters and the resulting filament yarn exhibited an unsatisfactory winding performance. In comparative example 5, the filament elongation increase agent (PMMA- (C)) was used, which shows a thermal deformation temperature (T) of 140 ° C which was higher than 130 ° C and therefore did not comply the requirement (a) of the present invention. In this case, since the difference in temperature of thermal deformation (T) between the polyester resin and the particles was too great, the particles of the filament elongation increase agent had an effect of resistance too high to the elongation-thermal deformation of the polyester resin, and the thermal deformation of the particles could not follow the thermal deformation of the polyester resin. Likewise, the resulting PMMA- (C) particles distributed in the filaments had too large a particle size (D), and therefore the polyester resin mixture exhibited an unsatisfactory filament-forming property, and the filament yarn The resulting polyester had an unsatisfactory rolling performance. Comparative Examples 7 to 9 In each of the comparative examples 7 to 9, a polyester filament yarn was produced in which it was wound by the following procedures. Polyester resin flakes with an intrinsic viscosity of 0.62 determined in the same manner as in Example 1, produced by a direct polymerization method, and containing 0.08% by weight of luster removal agent consisting of dioxide pigment. titanium, were dried at a temperature of 160 ° C for 5 hours. The dried resin flakes were fed in a melt extruder through a flake feed duct and a feeder with measurement. Likewise, the polyester resin master flakes containing 20% by weight of PMMA with a thermal deformation temperature of 121 ° C, a melt index of 1.0 g / 10 minutes determined at a temperature of 230 ° C under a load of 8 kgf, and a weight average molecular weight of 150,000 were fed to the melt extruder through a side conduit and a feeder with gauge in order to provide a mixture of the polyester resin flakes and resin flakes of polyester containing PMMA, said mixture contained 1.0 wt% of PMMA. The mixture was melted at a temperature of 300 ° C while it was being stirred and the melted mixture was filtered through a metal filament filter with the pore size illustrated in Table 14, and then extruded through a row of 36 nozzles each with a diameter shown in table 4, and placed immediately below the filter, at the same spinneret temperature as in example 1, in the tension ratio (Vw / Vo) shown in table 4. The currents Extruded filaments were cooled and oiled in the same manner as in Example 1 and recovered at a rate of 5., 000 m / minute. The resulting filament yarn had a yarn count of 133.3 dtex (120 denier) / 36 filaments. The results of the test are shown in Table 4. Table 4 Melt-Spun Element Example No. Bore Diameter Tensile Diameter Example - Filter Keels Comparative (mm) 7 0.15 57 40 0.4 405 50 0.8 1620 25 Particle Particles Incrementing agent for filament elongation in individual filament D (*); L / D (*) Density of distribution in elongation Example No, (%) Area in- Area rea the number Terna inter exter ro (N) Mean n of particles (*) 3 (particles / 100um2) Example 0.036 20 106 98 96 15 Comparative 0.151 9 94 115 91 8 0.189 6 91 109 100 7 Element Polyester filament yarn Example DeltaN Resis Elon Incremen Form No. Tension to present To the last elongation Re sual Tension (I) Example 7 0.0655 2.8 94 45 3 Comparative 8 0.0495 2.5 135 109 2 9 0.0422 2.2 167 156 1 The results of comparative examples 7 to 9 are the following. In comparative example 7, in which the diameter of the melt spinning nozzles was 0.15 mm, the melt spinning tension was 57 which is less than 150, the requirement (b) of the present invention is not fulfilled and the increase (I) of the residual elongation was less than 50%. It is considered that the filament elongation increase agent was finely cut by a high cutting force generated in the very narrow melt spinning nozzle, and the very fine particles of the filament elongation increase agent had an increase effect of reduced elongation. In Comparative Example 7 where a filter having a pore size of 50μm that was greater than 40μm was used, and the particle size (D) in the transverse direction was 0.151μm which was more than 0.15, the presentation of Resulting thread presented spider webs. In Comparative Example 8 where the melt spinning nozzles had a large diameter of 0.8 mm and the melt spinning tension was 1620 which was more than 1,500, coarse particles of the filament elongation increase agent were exposed to the peripheral surfaces of the individual filaments, and consequently the resulting filament yarn exhibited a significantly reduced coefficient of friction F / F. In this case, the destruction phenomenon occurred frequently within a few minutes of the start of rolling. Example 9 and Comparative Examples 10 and 11 In Example 9, a melt spun polyester filament yarn was produced by the same procedures as in Example 6, and subjected to a false twist procedure in a heater length of 1.6 m at a heater temperature of 180 ° C, at a controlled tensioning ratio to adjust the ultimate elongation of the resulting textured filament yarn to 25% at a controlled false twist disk drive speed to adjust a ratio (T? G). / T2g) between a tension (Txg) of the filament yarn upstream of the false twist disk and the tension (T2g) of the filament yarn located downstream of the false twist disk at 0.93. In Comparative Example 10, the same melt-spun polyester filament yarn as in Comparative Example 8 was subjected to the same false twisting procedure as in Example 9. In Comparative Example 11, a melt-spun yarn was produced by the same procedures as in comparative example 8, except that the content of the lubricant containing, as friction increase material FF, nonylphenyl ether reacted by addition with ethylene oxide (10 moles), in the emulsion of lubricating agent aqueous change from 10% by weight (Fa) to 25% by weight (Fb). The lubricating agent emulsion was applied to the melt spun filament yarn by means of an oil addition nozzle during the melt spinning process. The melt-spun polyester filament yarn was subjected to the same false twisting procedure as in Example 9. The results of the test are shown in Table 5. Table 5 Element Filament Filament yarn lubrication Melt yarn Yarn in OPU composition Resistance Elonga in fusion (%) to the last tension (g / of; (%) Example No. Example Example Fa 0.27 2.5 136 Comparative Comparative 10 8 Example Example Fa 0.29 2.2 143 Comparative 6 9 Example Example Fb 0.26 2.6 134 Comparative comparative 11 8 Element Filament Filament yarn Melt-melt spinning Coefficient of Presenting Form F / F tion Example No. Example Example 0.25 2 Comparative Comparative 10 8 Example Ex Emplo 0.28 Comparative 6 9 Example Example 0.30 Comparative comparative 11 8 Element Filament Yarn Textured by tension Melting yarn resistance elongation number of the last tension (%) fluffs (g / of) per m Example No.

Example Example 4.9 25 none Comparative Comparative 10 8 Example Example 4.7 26 none Comparative 6 9 Example Example 4.5 25 5 / m Comparative Comparative 11 8 As shown in Table 5m in comparative example 10, since the filament yarn spun in melt showed a low coefficient of friction F / F, the resulting yarn presentation had spider webs. However, the meltblown filament yarn could be softly textured by the false portion method, and exhibited satisfactory physical properties and a high resistance to lint formation. In Example 9, the melt spinning and texturing procedures were carried out smoothly without any problem. The resulting textured filament yarn exhibited satisfactory properties. In comparative example 11, the composition of the lubricant emulsion changed in order to increase friction F / F. The resulting yarn had a good presentation. However, the increased friction of the filament yarn caused an increase in the friction of the filament yarn with a texturizing disc and yarn guides, and consequently the resulting textured yarn exhibited a limited resistance to lint and was unsatisfactory.

Claims (4)

1. CLAIMS A polyester filament yarn having an improved winding performance, produced by the melt spinning of a mixture of a polyester resin with particles of a filament elongation increase agent in an amount of 0.5 to 4.0% based on in the weight of the polyester resin, and by recovering the melt spun polyester filament yarn at a speed of 2,500 to 8,000 m / minute, in order to form a polyester filament yarn comprising several filaments each comprising a matrix consisting of the polyester resin and the filament elongation enhancement agent particles dispersed in the polyester resin matrix, said polyester filament yarn exhibits an increase (I) in residual elongation of 50% or more, as determined in accordance with the equation: I (%) = (EIb / EL0 - 1) x 100 where I represents the increase in residual elongation as a percentage of The polyester filament yarn, EIb represents a residual elongation as a percentage of the polyester filament yarn, and EL0 represents a residual elongation as a percentage of a comparative polyester filament yarn produced by the same procedures as the procedures used for yarn of polyester yarn. polyester filaments except that the comparative polyester filament yarn does not contain filament elongation increase agent and characterized in that said filament elongation increase agent particles contained in the polyester filaments meet the requirements (a), (b) ) and (c): (a) the filament elongation increase agent particles have a thermal deformation temperature (T) within the range of 105 to 130 ° C; (b) provided that the polyester filaments have a non-hollow circular cross-section, the distribution density of the filament elongation increase agent particles in the circular cross-section of the polyester filament is optimized in an area in the form of ring between two concentric circles around the center of the circular cross section, the radii of two concentric circles correspond to 1/3 and 2/3 of the radius of the circular cross section of the polyester filaments, respectively; and (c) the number (N) of the filament elongation increase agent particles that appear on the peripheral surfaces of the polyester filament is 15 particles / 100 square meters or less.
2. 2. The polyester filament yarn according to claim 1, wherein the thermal deformation temperature (T) of the filament elongation increase agent particles is within the range of 110 to 130 ° C. The polyester filament yarn according to claim 1, wherein the amount of filament elongation increase agent particles distributed in the ring area is 50% by weight or less, based on the total amount of the particles that appear in the circular cross section. The polyester filament yarn according to claim 1, wherein the number (N) of the filament elongation increase agent particles that appear on the peripheral surface of the polyester filament is 10 particles / 100 μm or less. The polyester filament yarn according to claim 1, wherein the particles of filament elongation increase agent distributed in the polyester filament have an average particle size (D) of 0.05 to 0.15um, in accordance with the determined in the transverse direction of the polyester filaments. The polyester filament yarn according to claim 5, wherein the filament elongation increase agent particles distributed in the polyester filaments are elongated in the longitudinal direction of the polyester filament and have a L / D ratio of 20 or more. less, where L represents an average length of the particles determined in the longitudinal direction of the polyester filament and D represents the average particle size determined in the transverse direction of the polyester filaments. The polyester filament yarn according to claim 1, which has a bi-refringency (delta n) within the range of 0.015 to 0.105. The polyester filament yarn according to claim 1, wherein the particles of filament elongation increase agent comprise a polymerization product by the addition of at least one ethylenically unsaturated organic monomer, said polymerization product by addition of the unsaturated organic monomer is substantially incompatible with the polyester resin and has a weight average molecular weight of 2,000 or more. The polyester filament yarn according to claim 8, wherein the polymerization product by addition of the unsaturated organic monomer comprises an acrylate polymer comprising, as a main component, an addition-polymerized methyl methacrylate and having an average molecular weight of weight from 8,000 to 200,000 and a melt index of 0.5 to 8.0 g / 10 minutes, as determined at a temperature of 230 ° C under a load of 3.8 kg. The polyester filament yarn according to claim 8, wherein the polymerization product by addition of the unsaturated organic monomer comprises a styrene polymer comprising, as a main component, an isotactic styrene polymer and having a weight average molecular weight. from 8,000 to 200,000 and a melt index of 0.5 to 8.0 g / 10 minutes in accordance with that determined at a temperature of 230 ° C under a load of
3. 3.8 kg. 11. The polyester filament yarn according to claim 8, wherein the polymerization product by addition of the unsaturated organic monomer comprises a styrene polymer comprising, as a main component, a syndiotactic (crystalline) styrene polymer, and having a weight average molecular weight of 8,000 to 200,000 and a melt index of 6 to 2.5 g / 10 minutes, as determined at a temperature of 300 ° C under a load of 2.16 kg. 2. The polyester filament yarn according to claim 8, wherein the polymerization product by addition of the unsaturated organic monomer comprises a methylpentene polymer comprising, as a main component, a 4-methylpentene-1 polymerized by addition and having a weight average molecular weight of 8,000 to 200,000 and a melt index of 5.0 to 40.0 g / 10 minutes in accordance with that determined at a temperature of 260 ° C under a load of 5.0 kg. 13. In a process for the production of a polyester filament yarn, comprising: extruding a melt of a mixture of a polyester resin with particles of a filament elongation increase agent in an amount of 0.5 to 4.0% by weight Weight based on the weight of the polyester resin through a spinneret, pick up the filament yarn of melt extruded polyester at a speed of 2,500 to 8,000 m / minute along a spinning line, said process is characterized because, in the melt extrusion step, the melt passes through a filter having a pore size of 40um or less placed immediately upstream of the die, and in the spinning line, a thought of the filament yarn of Extruded fused polyester is controlled within a range of 150 to 1,500, thus providing said yarn with improved coiling performance. The process for the production of a polyester filament yarn according to claim 13, wherein in the recovery step, the melt extruded polyester filament yarns are cooled by blowing downstream cooling air in with the row at a controlled blowing speed within a range of 0.15 to 0.6 m / sec. The process for the production of the polyester filament yarn according to claim 13, wherein in the melt extrusion step, the polyester resin containing the particles of the filament elongation-increasing agent dispersed therein in an amount of 0.5 to
4. 4.0% by weight based on the weight of the polyester resin and a Polyester resin which does not substantially contain any particles of filament elongation increase agent are melt extruded by means of a co-spin method, in the recovery step, the resulting mixed filament yarn is collected at a speed of 2,500 at 8,000 m / minute.