JP2018527479A - Polyamide fiber having improved comfort management, method thereof, and article made therefrom - Google Patents

Abstract

The present invention relates to polyamide fibers having improved comfort management properties. The present invention also discloses a method for obtaining such fibers and articles made therefrom. The polyamide fibers are made from a hygroscopic polyamide with a multilobe cross-sectional profile. The hygroscopic polyamide fibers are preferably made from polyamide 5X, where X is preferably an integer from 4 to 16. Most preferably, it is polyamide 5.6, which is a polyamide derived from pentamethylenediamine, which is a raw material for living things, and derived from a renewable raw material mainly composed of sugar. As such, the present invention discloses polyamide fibers and articles made therefrom for sportswear and leisurewear applications having improved water absorption, wicking, and drying properties, where sweat is away from the skin. Carried and dried quickly, thereby reducing wet sensation and coldness during activity. The present invention provides freshness and comfort by maintaining a pleasant skin temperature and a climate within the garment.
[Selection figure] None

Description

  The present invention relates to polyamide fibers having improved comfort management properties. The present invention also discloses a method for obtaining such fibers and articles made therefrom. The polyamide fibers are made from a hygroscopic polyamide with a multilobe cross-sectional profile. The hygroscopic polyamide fiber is preferably polyamide 5. Produced from X (where X is preferably an integer from 4 to 16). Most preferred is polyamide 5.6, which is a polyamide derived from pentamethylenediamine as a raw material and derived from a renewable raw material mainly composed of sugar. As such, the present invention discloses polyamide fibers and articles made therefrom for sportswear and leisurewear applications having improved water absorption, wicking, and drying properties, where sweat is away from the skin. Carried and dried quickly, thereby reducing wet sensation and coldness during activity. The present invention provides freshness and comfort by maintaining a pleasant skin temperature and a climate within the garment.

  There is a growing demand for comfort in sportswear and leisurewear clothing. According to World Sports Activewear, “comfort is the most important thing in apparel” and this is the number one consumer expectation. Comfort not only affects the wearer's satisfaction, but also its behavior and ability. For example, if a heavily sporting person wears a poorly breathable garment system, heart rate and rectal temperature will increase much more rapidly than when wearing breathable sportswear.

  Polyamide fibers are the most suitable fibers for improving comfort among the synthetic fibers available on the market. Polyamide is very soft, smooth and comfortable against the skin. In addition to a very balanced moisture behavior, it provides a very comfortable sensation with high flexibility, light weight, and wear resistance. Polyamides also have high durability, good physical and chemical properties, ease of care, and quick drying.

  Polyamide, also known as nylon, is a linear condensation polymer consisting of repeating main bonds of amide groups. The amide group (—CO—NH —) — provides a hydrogen bond between the polyamide intermolecular chains. Polyamide fibers are usually produced by melt spinning extrusion and are available in staple fiber, tow, monofilament, multifilament, raw or textured form.

  As such, polyamides are promising candidates for sportswear, underwear, leisure wear, and other uses on the bare skin. The fabric on the bare skin is usually a soft and skin-friendly fabric made of hydrophilic and / or porous fibers and is designed to absorb sweat from the body and maintain a comfortable skin garment climate. Sweating is the mechanism required to cool the body in response to the generation of high levels of body heat. When sweating, the climate inside the skin becomes suddenly humid. For efficient cooling, the evaporated sweat needs to be carried as water vapor by convection through a layer of air adjacent to the garment and skin and / or through the garment opening.

  The fabric on the bare skin controls the climatic temperature in the clothing and the humidity of the skin. In low-metabolism activities, the fabric's climate is maintained by the air that remains, so the fabric must reduce air movement. Higher metabolic activities require that heat and moisture be transferred from the dough to cool the skin. In this case, moisture is controlled by absorption, transportation, or ventilation.

  For moderate activities that sweat only a limited amount, absorption reduces skin humidity and retains relative comfort, while in higher metabolic activities and intense sweating, moisture remains in the clothing system There is a possibility that the efficiency of heat insulation will be reduced due to wet clothing, which may adversely affect the heat balance at a later stage, which reduces comfort and makes the chill feel after stopping activity. Cause it to occur. Therefore, the principle of transport should be applied in conditions that sweat more, in which case the sweat is carried away from the skin by wicking and capillary action, thereby keeping the skin dry.

  Synthetic fibers are durable and easy to care for, but most are hydrophobic. Hydrophobic textiles on the bare skin can cause moisture to rise rapidly due to sweating, so hydrophobic fabrics carry water quickly away by the space for capillary action between the fibers and yarns Need to be designed to. On the other hand, hydrophilic and / or hygroscopic fibers absorb and transport water by the fibers themselves and by capillarity, and thus promote evaporation.

  Highly hygroscopic fibers also cause prolonged physiologically problematic drying times. If the drying time is too long, a sweat-soaked shirt loses its thermal insulation, and chills after exercise cannot be avoided. This mechanism is usually found in these because of the very high hydrophilic properties of natural and regenerated fibers. In addition, wet skin may cause skin irritation and further skin diseases caused by moisture.

  For example, wool has a high absorption capacity and can handle a small amount of moisture without losing its thermal insulation properties. Wool can be used as a fabric on the bare skin and can keep the skin relatively dry. However, when the dough is saturated, the ability to control moisture decreases. Cotton has very good properties for the garment worn in normal wearing situations where it sweats only a limited amount. In this situation, cotton can lessen the sweat irritation and thus keep the garment climate drier and more comfortable. However, in the field of sports textile products where more liquid sweat is produced over a longer period of time, cotton is only recommended in combination with the outside of the laminated material and the inside of the synthetic fiber on the skin side . When cotton is used alone or as the main fiber component, the textile product gets wet with moisture and gets wet and sticks to the body.

  Moisture absorbed by the clothing gradually loses its thermal insulation. When activity is stopped and sweating subsides, the drying of wet layers of clothing can remove more heat from the body than is generated by metabolic rate, resulting in a hypothermic endangering heat balance. It causes the effect of making you feel chilly after exercise. Chilly after exercise can be avoided by a short drying time. In fact, a short drying time is one of the main prerequisites for good comfort for sportswear.

  In summary, textile products are required to have reasonable hydrophilicity, high wicking rate, and fast drying rate in order to be effective in maintaining a pleasant garment climate and comfort. If the hydrophilicity is too high as in the case of natural fibers, water is absorbed and retained in the fibers for a longer time, which may slow the drying rate. Poor wicking results in saturated areas and can result in reduced transport and drying rates. Therefore, it is necessary to achieve an optimal balance among hydrophilicity, wicking properties, and quick drying properties.

  There has been a considerable amount of research activity to improve the moisture management of polyamide fiber products. There are multiple approaches such as adding a hydrophilic material into the fiber matrix or onto the fiber surface such as polyvinylpyrrolidone (PVP) and ethoxylated polyamide, or blending the polyamide with another hydrophilic polymer by two-component melt extrusion. Has been adopted. An example of a sheath-core polyamide multifilament is disclosed in JP2012-211406, in which a polyalkylene oxide-modified product is used as a core material. This approach requires a two component device. Also, the drying speed and wicking speed cannot be obtained.

  In another approach, a coolant is added into the polyamide fiber matrix to improve cooling and moisture management properties. This method is disclosed in Chinese Patent Application No. 1041778839 and Chinese Patent No. 103088459. Disadvantages of this approach include the lack of quick drying, water absorption, and wicking speed. This cooling mechanism may also cause unpleasant sensations such as hypothermia due to excessive cooling during sweating due to activity.

  In Chinese Patent Application No. 103882550, which is a Chinese patent application, a cooled polyamide fiber using a coolant such as inorganic metal oxide particles is proposed, but PVP is added to the fiber for the purpose of improving water absorption. The A disadvantage of using PVP is that the presence of pyrrolidone as a by-product tends to cause fiber yellowing, thereby affecting the desired mechanical and chemical properties for textile applications. is there. Furthermore, rapid wicking and drying effects have not been demonstrated and can cause discomfort during excessive sweating and sports activities.

  A few patents attempt to provide polyamide fibers that manage moisture by only changing the fiber cross-section. Filaments having cross-sections other than circular are generally proposed for aesthetic effects, moisture management, and light weight. Examples of non-circular contours include “dogbone”, “trefoil”, “zigzag”, “king”, “flat”, and “hollow”. This approach aims to increase the capillary effect by introducing grooves and minute channels in the longitudinal direction of the filament to create spaces in and between the fibers. For example, the trefoil profile (also referred to as Y) is well known and widely used to impart gloss and vividness to articles, but this does not provide deep microchannels, so capillary action, Does not increase softness and surface area. Japanese Patent No. 5206640 discloses an improved cross-section polyamide with radial lobes. However, water absorption, wicking, and drying rate have not been evaluated or improved.

  U.S. Patent Publication No. 201515013047 disclosed a cooled polyamide yarn using an inorganic cooling additive, an improved cross-section, and a low crimp module. The disclosed cross section is a flat cross section. The disadvantage of this cross-section is that the flat fiber contours cover the skin more, reduce thermal insulation, reduce air intake, and increase the point of contact with the skin that can reduce the feeling of skin comfort. . This is not suitable for more sweating activities because it does not give capillarity and does not increase wicking and drying rates. Furthermore, the flat cross section evaluated in the experiment of the present invention showed inferior processing behavior. This suggests that it may be more difficult to process a flat cross section by melt spinning.

  Finally, EP 2554721 discloses hygroscopic polyamide 5.6 fibers. However, there are no additional advantages of fast wicking and drying rates as provided by the present invention. Thus, EP 2554721 does not provide a solution for comfort management of sportswear textile products where wicking and faster drying speed are desired.

  There are still no fibers on the market that simultaneously provide hydrophilic properties, cooling effects, and wicking properties.

  In view of the above, there is a need for synthetic fibers with essentially improved comfort management properties that have the added benefit of quick drying and wicking properties that mimic the softness and comfort of natural fibers. Yes.

There is also a need to provide a solution for having a comfortable polyamide fiber product, including:
-Optimal hygroscopicity to absorb sweat without a wet feel and maintain the ideal garment climate insulation.
-Enhanced wicking speed to efficiently carry sweat away from the skin.
-Fast drying speed to keep skin dry and avoid unpleasant chilly sensations after exercise.
-Sensory skin comfort for a pleasant hand with textured multifilament yarns with multiple very fine filaments.

  Accordingly, it is an object of the present invention to provide a polyamide fiber having excellent comfort management properties, a method thereof, and an article made therefrom, thereby improving the skin garment climate during sports and sweating activities. And creating a comfortable sensation.

  The present invention is a solution for obtaining polyamide fibers that are very comfortable and refreshing in order to give the wearer a comfortable sensation.

  Accordingly, the present invention relates to polyamide 5. Having improved comfort management, including hygroscopic polyamide, a bio-based aliphatic polyamide, selected from the group consisting of X (where X is an integer from 4 to 16) and mixtures thereof Polyamide fiber having a multilobe-shaped cross section characterized by having at least two coalesced centers and at least five equally sized elliptical lobes, each coalesced center being adjacent and equal A polyamide fiber is provided that connects at least three equally sized elliptical lobes according to angular symmetry between sized elliptical lobes.

  Surprisingly, it has been found that such polyamides exhibit sufficiently high hygroscopicity, water drying rate, water diffusion rate, and water absorption compared to non-hygroscopic polyamides having a circular cross section. It has been found that increased water absorption, wicking, and drying speed provide better moisture management and comfort is also sufficiently improved.

  The present invention is a method for obtaining said polyamide fiber with improved comfort management, wherein the polyamide fiber comprises a hygroscopic polyamide, for example by using a new multi-lobe cross-section spinneret A process obtained by melt spinning extrusion of the product is also aimed.

  The present invention also proposes a polyamide article comprising polyamide fibers with improved comfort management as defined above and in the following paragraphs and a method for obtaining such a polyamide article, wherein The polyamide fibers of the invention are converted by texturing, stretching, warping, knitting, weaving, non-woven processing, sewing, or combinations thereof.

  Another object of the present invention is to improve the comfort management of the polyamide articles, particularly the textile articles produced therefrom, of the polyamide fibers having improved comfort management as defined above and in the following paragraphs. Is the use of.

The schematic example of a cross section of a multilobe type. Schematic example of a special spinneret orifice. Other cross-sectional contours.

Definitions The expression “polyamide fiber” in the sense of the present invention is the usual term including the following spun articles: fibers, monofilaments, multifilaments, and yarns. The “polyamide article” of the present invention is a polyamide fiber that has been converted or treated and is a staple fiber, any flock or any textile composition made from polyamide fiber, especially fabrics and / or garments. In the following description, the terms “fiber”, “yarn”, and “filament” may be used independently without changing the meaning of the present invention.

Polyamide fiber with improved comfort management The present invention relates to polyamide 5. Having improved comfort management, including hygroscopic polyamide, a bio-based aliphatic polyamide, selected from the group consisting of X (where X is an integer from 4 to 16) and mixtures thereof Polyamide fiber having a multilobe-shaped cross section characterized by having at least two coalesced centers and at least five equally sized elliptical lobes, each coalesced center being adjacent and equal A polyamide fiber is provided that connects at least three equally sized elliptical lobes according to angular symmetry between sized elliptical lobes.

Hygroscopic polyamide Hygroscopic polyamide is polyamide 5. An aliphatic polyamide comprising X (where X is an integer of 4 to 16) or a mixture thereof.

  Polyamide 5. X is produced from pentamethylenediamine and aliphatic dicarboxylic acid as raw materials. The list of potential dicarboxylic acids is as follows: butanedioic acid (succinic acid), pentanedioic acid (glutaric acid), hexanedioic acid (adipic acid), heptanedioic acid (pimelic acid), octanedioic acid (suberin) Acid), nonanedioic acid (azelaic acid), decanedioic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, brassic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid. All these diacids are commercially available.

  Polyamide 5. X has the advantage that it can be produced from biomass according to ASTM 6866. Pentamethylenediamine can also be synthesized from biological resources according to ASTM 6866, and the resulting polyamides can be made from 40% to 100% biological resources.

  The amino end group (ATG) content of the polyamides based on these organisms is preferably 25-60 equivalent / ton and the carboxyl end group (CTG) is preferably 45-90 equivalent / ton. These amino / carboxy end group contents are measured according to the method described in the following experimental section.

  The hygroscopic polyamide is preferably polyamide 5.4, polyamide 5.6, polyamide 5.8, polyamide 5.10, polyamide 5.12, polyamide 5.14, polyamide 5.16, and mixtures thereof, such that X is 4. Polyamide which is an even number of 4 to 16. X. More preferably, X is 6 or 10, advantageously 6 such as polyamide 5.6 (nylon 5.6, also known as poly (pentamethylene adipamide)), which comprises pentamethylenediamine as raw material and Produced by polycondensation reaction with adipic acid.

  Preferred polyamides 5.6 may have a viscosity index (IVN) in the range of 100 to 200 ml / g, preferably about 120 to 170. This IVN is measured according to the ISO 307 standard, which will be explained in the experimental section below.

  A particularly preferred polyamide 5.6 of the present invention has an IVN (viscosity index) of 138-142 and an ATG (amine end group) of 38-42.

  The hygroscopic effect of polyamide 5.6 measured according to the method described in the following experimental section is at least 4%. The hygroscopic character is attributed to the odd / even configuration of diamines (5 carbons) and diacids (6 carbons). This imbalances the intermolecular bonds and reduces the hydrogen bonds within the molecule, resulting in accessible sites that are more accessible to more water within the molecule.

  The polyamide fibers of the present invention advantageously comprise greater than 75% hygroscopic polyamide, preferably greater than 85%, more preferably greater than 95% by weight, based on the total weight of the fiber.

  In practice, the polyamide fibers of the present invention are stable to other polymers such as PA 6.6, PA 6.10, and PA 6 and / or plasticizers, antioxidants, stabilizers, heat or light stabilizers, etc. Agents, colorants, pigments, nucleating agents such as talc, matting agents such as titanium dioxide and zinc sulfide, processing aids, biocides, viscosity modifiers, cooling agents, catalysts, far-infrared emitting minerals, antistatic Additives such as agents, functional additives, optical brighteners, nanocapsules, antibacterial agents, acaricides, antifungal agents, or other conventional additives may be included.

  Usually, the amount of additive in the fiber corresponds to a maximum of 25% by weight, more preferably a maximum of 10%.

  In another embodiment of the invention, a coolant or temperature regulator is used. Coolant includes any far-infrared ceramic powder, inorganic fillers such as inorganic metal oxides (eg TiO2, ZrO2, MgO, SnO2, ZnO, BaO), jade powder, zirconia powder, silica powder, mica, boron nitride, Calcium carbonate, barium carbonate, magnesium carbonate, aluminum silicate, alumina, zeolite, and talc may be included. Temperature regulators also include phase change materials such as paraffin or endothermic substances such as sugar alcohols such as xylitol or erythritol. Coolants or temperature regulators produce contact cold by providing good thermal conductivity due to slow endothermic and fast thermal diffusion properties and fast thermal conduction through the body.

Multilobe-shaped cross section The polyamide fibers of the present invention have a multilobe-shaped cross section characterized by having at least 2 coalesced centers and at least 5 equally sized elliptical lobes, each coalesced. The center connects at least three equal sized elliptical lobes according to angular symmetry between adjacent equal sized elliptical lobes.

  In the polyamide fibers of the present invention, a “lobe” is understood to be an elliptical portion / area of the fiber cross-section that connects to at least one coalesced center.

  In the polyamide fiber of the present invention, “merged center” is understood to be the confluence of at least three lobes.

  According to a preferred embodiment, the multilobe-shaped cross section has 2 to 6 merged centers, preferably 2 or 3 merged centers, each merged center being 120 respectively between adjacent lobes. Three or four equally sized elliptical lobes are symmetrically connected according to an angle of 90 ° or 90 °, with the best result being that each merged center has three according to a 120 ° angle between adjacent lobes. Is obtained when elliptical lobes of equal dimensions are connected symmetrically.

  A schematic example of a multilobe cross section is shown in FIG. In FIG. 1, there are three merged centers indicated by the letter a, b represents a lobe, and in this specific example there are seven lobes. c represents the 120 ° angle reproduced between each adjacent lobe.

  Other cross-sectional profiles are shown in FIG. 3, in which the profile of the present invention is illustrated by “A” to “F” (120 ° symmetry) and “I” and “J” (90 ° symmetry). Yes. The contours “G”, “H”, and “K” are shown for comparison only.

  If it has a multilobe-shaped cross section with at least two merged centers and three lobes arranged with 120 ° angular symmetry, it means that all adjacent lobes are connected at an angle of 120 °. Means that For example, two merged centers have a total of 5 lobes, 3 merged centers have a total of 7 lobes, and so on. For any “N” number of merged centers, the number of lobes is “(N * 2) +1”.

  A multilobe-shaped cross-section with at least two merged centers of four lobes arranged with 90 ° angular symmetry means that any adjacent lobes are connected at 90 °. For example, two merged centers connect 7 lobes, 3 merged centers connect 10 lobes, and so on. For any number of “M” s in the merged center, the number of lobes is “(M * 3) +1”. The lobes are angularly symmetric, meaning that any adjacent lobes are connected at 90 °.

  Therefore, the total number of lobes in the cross section may be 5 (image “A” in FIG. 3) to 13 (image “F” in FIG. 3). The best cross-section sharpness and workability is the cross-section with an angle between adjacent lobes of 120 °, more specifically two with 5 lobes and 7 lobes respectively (see image “ A ") and three cross sections with merged centers (image" B "in FIG. 3).

  Asymmetrical cross sections such as samples “G” and “H” in FIG. 3 should be avoided as they exhibit poor processability. These cross-sections are shown for comparison only, as is the conventional circular cross-section, and so is sample “K” in FIG. 3 which does not belong to the present invention. Usually, flat cross sections such as “G” and “H” in FIG. 3 are more difficult to process.

  The particular multilobed cross section of the present invention produces a special fine and continuous concave surface along the length of the fiber. The capillarity and higher surface area of the fibers of the present invention increase water absorption, diffusivity, and drying rate, thereby improving moisture management and the comfort of the textile produced therefrom. Less dense yarn is obtained that contributes to the creation of more voids inside the filament, which improves the thermal insulation, capillarity, and the thermoregulatory function of the textile produced therefrom.

  The larger surface area of the cross-section of the present invention allows sweat diffusion, which greatly contributes to faster sweat evaporation. As such, the fiber article produced therefrom dries more quickly, keeping the wearer comfortable and dry during exercise. As a result, the heat insulating property of the fiber article to be produced from now on is maintained, thereby avoiding the action of a damp cloth that makes it feel chilly after exercise.

  In contrast to the elastic nature of the circular and trefoil cross-section (Y-shape), the hand and softness are also greatly improved due to the smaller bending stiffness caused by the irregular and preferred bending direction of the cross-section. A similar phenomenon of softness is also observed in the “bean” section of cotton fibers. For example, “Image“ B ”in FIG. 3 has a preferred bending direction to a deeper concave surface.

  The polyamide fibers of the present invention advantageously have an overall dtex of about 40-300, about 0.1-5 dpf (dtex per filament), 20-80 cN / Tex tensile strength (at break), and 20% Has an elongation (at break) of ~ 90%.

Method for Obtaining Polyamide with Improved Comfort Management First Embodiment: Raw Yarn The present invention also provides a method for obtaining polyamide fiber with improved comfort management as described above. Polyamide fibers are obtained by melt spinning extrusion. “Melt-spinning extrusion” is understood to mean an extrusion process that converts polyamides into polyamide fibers. The polyamide can be fed to the melt spinning apparatus in pellets, powder, or molten form. The method includes any conventional extrusion spinning means suitable for melt spinning extrusion of polyamides such as single screw extruders, twin screw extruders, two component extruders, and lattice spinning heads, these means being known to those skilled in the art. Is well known. Melt spinning extrusion is available as LOY (low drawn yarn), POY (semi-drawn yarn), FDY (fully drawn yarn), FOY (fully drawn yarn), LDI (for low denier industry), or HDI (for high denier industry) It can be further defined.

Melt spinning extrusion advantageously includes the following steps:
a1. Feeding a polyamide composition containing a hygroscopic polyamide in the form of a melt, pellets or powder into the inlet of a screw extruder;
a2. Melting, homogenizing and pressing the polyamide composition;
a3. Spinning the molten polyamide composition into fibers,
a4. Cooling and winding the fiber.

  In step a1, the hygroscopic polyamide is preferably introduced continuously as a melt, pellets or powder into the inlet of the screw extruder. In step a2, the polyamide is preferably melted, homogenized and pressurized in a screw extruder, preferably at a temperature of 260-310 ° C. above the melting point of the polyamide and an extrusion pressure of 30-70 bar.

  Thereafter, according to step a3, the molten polyamide is preferably used at a temperature of 260-310 ° C., a spin pack pressure of 150-250 Bar, and 3-8 kg / hour using a spinning screen pack comprising a filter element and a spinneret. Spin into fiber (or yarn or filament) at spin pack flow rate.

  A special spinneret must be used during step a3 to obtain a combined lobe, multi-lobe shaped cross section with elliptical lobes of the same dimensions and angular symmetry.

  A spinneret is a metal plate that includes an orifice that is used to extrude a polymer to the desired cross-sectional shape and size.

  A special spinneret is a multi-lobe type orifice in which each orifice has at least two coalesced centers, at least five equal sized elliptical lobes, and angular symmetry between adjacent equal sized elliptical lobes. including.

  The multilobe-shaped orifice preferably has 2-6 merged centers, each merged center having 3 or 4 equally sized ellipses according to an angle of 120 ° or 90 °, respectively, between adjacent lobes. The lobes are connected symmetrically.

  The best results have 2-6 merged centers, preferably 2 or 3 merged centers, where each merged center has 3 equal dimensions according to an angle of 120 ° between adjacent lobes. Are obtained with multi-lobe type orifices which are connected symmetrically.

  A schematic example of a special spinneret orifice is shown in FIG. In FIG. 2, there are three merged centers indicated by the letter a, b corresponds to a lobe, and in this specific example there are seven lobes. c corresponds to an angle of 120 ° reproduced between each adjacent lobe.

  With respect to each orifice of the spinneret of the present invention, a “lobe” means that during extrusion, a molten polymer passes through it to form a solid filament after cooling, which forms an elliptical portion / area of the fiber cross section. Is understood to be an area, orifice, or hole.

  For each orifice of the spinneret of the present invention, the “merged center” means the point of at least three lobes through which molten polymer passes during extrusion, but which will join at least three lobes after coalescence. It is understood that.

  The coalesced center of the spinneret orifice and an equally sized elliptical lobe are necessary to obtain a good polymer distribution in the orifice during extrusion, while angular symmetry is the stability, shape, and sharpness of the cross section Guarantees and strengthens the fiber groove and capillary action.

  A multilobe-shaped cross-section with a combined center of three lobes connected at an angle of 120 ° is shown in images “A” to “F” in FIG. A multilobe-shaped cross section with the combined center of four lobes connected at an angle of 90 ° is shown in images “I” and “J” in FIG.

  The coalescence phenomenon is well understood by those skilled in the art and is a process in which two or more separate parts (also called lobes) fuse together upon contact to form a single part. As such, the lobes do not connect with each other within the spinneret, but instead, the portions of the lobes fuse during extrusion to form a single continuous filament. The merged center is then the center of the individual lobes of the present invention, in particular 3 or 4 lobes.

  The best sharpness and workability of the cross section is obtained with a symmetrical profile with an angle between adjacent lobes of 120 °. More specifically, two (sample “A”) and three (sample “B”) combined central cross sections with “5 lobes” and “7 lobes”, respectively.

  Each set of lobes from the sample of FIG. 3 corresponds to a single continuous filament after extrusion, which are combined by a coalescence phenomenon. The total number of orifices (lobe sets) in the spinneret can be designed to produce yarns of 10-200 filaments. The lobes have an elliptical shape and are exactly the same dimensions.

  Step a4 is a step of cooling the fiber (or yarn or filament) to a solidified form and winding the polyamide fiber around a bobbin. In this step, spinning oil may be added onto the fiber. The winding speed is 3000 m / min to 6500 m / min.

  In the present invention, the extruder may be equipped with a metering system to introduce the polymer and optional additives (such as a masterbatch) into the main component polymer in steps a1 and / or a2 and / or a3. .

  Additional additives can be introduced into the process of the present invention or may be present in the hygroscopic polyamide polymer. The additives are listed above. These additives are typically added in the polymer or in steps a1 and / or a4 of melt spinning extrusion in an amount of from 0.001% to 10% by weight of the polyamide fibers.

  In an additional embodiment of the invention, a coolant or temperature regulator is also introduced in step a1 separately from the hygroscopic polyamide using a dosing device such as a weight or volumetric feed pump. The coolant or temperature regulator may be in the form of a powder, liquid, or solid masterbatch. The coolant or temperature regulator is advantageously introduced in an amount of 0.5% to 20.0%, preferably 1.0 to 5.0% by weight of the total weight of the polyamide fibers.

Second Embodiment: Textured Yarn According to the second embodiment of the present invention, the polyamide fiber obtained from the first embodiment is a textured yarn of greater elasticity, bulk and softness. It is then textured for manufacturing. This method includes any technique known to those skilled in the art such as false twisting, false twist-fixing, and air jet processing. Most preferred is false twisting.

The method has the following steps:
b1. A step in which the fiber is removed from the package and passed through a delivery roll;
b2. The process of the fiber passing through the heater and then entering the cold zone,
b3. The fiber passes through a spindle containing a rotating disk (friction aggregation),
b4. A process in which the entanglement points and coning oil are applied to the fibers
b5. The fiber may be wound on a bobbin, where the fiber is given a draw ratio by changing the speed ratio of b1 and b5.

  In step b1, the fibers are advantageously placed in the creel and unwound from the bobbin to the delivery roll. Step b2 preferably passes the fiber through a heater at a temperature between 120 ° C. and 400 ° C. to aid in the mechanical action of drawing and twisting the fiber by softening (making it more conformable). Including. Thereafter, the fiber is cooled.

  Step b3 is a place where the fibers are twisted, resulting in bulk, crimp and texture. The amount of twist is changed by changing the speed of the disc, the placement of the disc, and the D / Y relationship. The D / Y ratio changes the speed ratio between the friction disk and the linear velocity of the fiber. This ratio is preferably 1.0 to 2.8. The arrangement of the disks is preferably 1/2/1 to 1/8/1, guide disk / working disk / guide disk.

  In step b4, in order to impart lubricity and to improve physical and aesthetic properties (in the case of entanglement), entanglement points and coning oil are imparted to the fibers. The entanglement per meter is preferably at least 30 per meter. Step b5. Is the winding process, where the fiber is wound on a bobbin. The winding speed can vary from 150 m / min to 1500 m / min.

  The draw ratio is imparted to the fiber by changing the speed ratio of step b1 and step b5, which is an important parameter of the process to achieve the desired linear density. The draw ratio is preferably 1.10 to 4.00. Yarns larger than 1 ply, such as 1-8 ply, are also possible.

Polyamide articles The polyamide fibers of the present invention can then be converted into polyamide articles, in particular woven and / or garments. The polyamide articles of the present invention are manufactured from the polyamide fibers of the present invention (as defined above) or manufactured from the polyamide fibers obtained from the process of the present invention, preferably fibers, multifilament yarns, flocs Woven fabric, knitted fabric, non-woven fabric, or textile article.

The fiber article may be any fiber article known in the art such as, but not limited to, woven fabric, knitted fabric, nonwoven fabric, rope, string, sewing thread, and the like. For clothing, the best results are achieved with fabrics having a mass per unit area of 200 g / m ² , most preferably less than 150 g / m ² .

Methods for obtaining polyamide articles Methods for converting polyamide fibers into polyamide articles such as woven or garment are well known to those skilled in the art. Indeed, the polyamide fibers can be converted into polyamide articles by texturing, drawing, warping, knitting, weaving, non-woven processing, sewing, or combinations thereof. These articles continue to be used in many applications, particularly in socks, underwear, sportswear, outerwear, and leisure wear.

Advantages Additional advantages of the polyamide fibers with improved comfort management of the present invention and articles made therefrom are highlighted below:
In the present invention, a novel polyamide 5.6 fiber is disclosed which has essentially hygroscopic properties and capillarity effects. In contrast to the chemically modified hydrophilic polyamides offered on the market.
-In the present invention, a novel multi-lobe cross-sectional profile is disclosed.
The polyamide article exhibits a faster rate of water absorption, wicking and drying when compared to a non-hygroscopic polyamide of circular cross section.
-The synergistic effect of hygroscopicity, capillary action and the larger surface area of the cross section accelerates the drying rate of the water, so that the wearer feels dry and comfortable even after intense sweating.
-The mechanical and chemical properties of the polyamide article are not significantly changed.
-This method is simple and utilizes conventional known extrusion equipment.
-The cross-sectional profile of the present invention greatly improves the feel and softness of the fiber due to the smaller bending stiffness caused by the irregular and preferred bending direction, in contrast to the elastic nature of the circular and trefoil cross sections. To do. A similar phenomenon is observed in the “bean” section of cotton fibers.

Background of comfort and methods of evaluation Although comfort is a complex phenomenon, it can generally be classified into four different main aspects: a) Thermophysiological comfort is Affects temperature regulation, including the process of heat and moisture transfer through clothing. Key concepts include thermal insulation, breathability, and moisture management capabilities; b) sensory comfort of the skin characterizes and comforts the mechanical sensation that the textile produces when in direct contact with the skin Such perceptions include smoothness and softness, while discomfort may be tingling, overwhelming, or sticking to wet skin with sweat; c) ergonomic comfort It deals with compatibility and the freedom of movement it makes possible. This mainly depends on the pattern of the garment and the elasticity of the material; d) Physiological comfort is influenced by fashion, personal preferences, conceptual forms, etc.

  Thermophysiological comfort is based on the principle of energy conservation. All the energy produced in the body due to metabolism is exactly the same amount due to heat loss by the respiratory organs (breathing), dry heat flux (including radiation, conduction, convection), and heat flow by evaporation caused by sweating Must be dissipated from. If more energy is generated than is dissipated, the body becomes hyperthermic. Also, if the heat loss is too great, hypothermia occurs.

  Comfort is by no means the result of only one parameter, but rather it is the result of fiber composition, fabric structure, clothing layering system, chemical conversion treatment, and the like. Several studies have revealed that fabric structural parameters and chemical conversion are as important as fiber composition. For example, for a textile product for sports, in addition to hydrophilicity and quick drying, a lightweight, porous and thin fabric is desirable. Water vapor diffuses through the spaces between the yarns, the spaces between the fibers, the fiber material itself, and the open voids in the fiber product.

  The chemical conversion treatment includes a treatment mainly for the purpose of hydrophilicity, which aims to increase the hydrophilic nature of the hydrophobic fiber product. The disadvantage of the chemical conversion process is that it is a non-durable process and can only last for several household washing cycles. On the other hand, fibers with essential moisture management properties persist throughout the life of the fiber article.

  With regard to the composition of the yarn, the use of filament yarn results in direct skin contact with the too smooth and flat textile surface. This structure shows contact points with too much skin, and the fabric is recognized as sticking to skin that is too smooth and wet with sweat. Filament yarns have a poor touch feeling, while spun or textured yarns give a better touch. Textured yarns provide fewer contact points with the skin, greater thermal insulation, softness, and a pleasant feel. In spun and textured yarns, not only more 3D structures, but also protruding fiber ends, which act as a spacer between the skin and the fiber product. In order to increase wicking speed and surface area, the cross section of the yarn with grooves, vacancies and capillary flow paths along the filament is also important, which results in wicking and faster drying rates.

  Air is also an important feature of clothing. Air is welcomed not only for light weight but also for temperature control. A layer of air between the garment and the skin helps to reduce temperature fluctuations. By reducing the contact points between the skin and clothing, the air circulates freely and breathes the body.

  Moisture management properties are usually assessed by water absorption, vertical wicking, horizontal wicking, breathability, water vapor permeability, heat resistance, and drying rate. The AATCC 195 standard of “American Association of Chemists and Colorists” can be used to measure the liquid moisture management properties of textile products. Water absorption can be evaluated according to AATCC 79. The vertical wicking of textiles is usually evaluated by AATCC 197, while the horizontal wicking can be evaluated by AATCC 198. AATCC 199 and AATCC 200 can be used to measure the drying time of textiles at various conditions using a moisture gravimetric analyzer. Apart from the above methods, heat to assess comfort, such as using a heated hot plate (ASTM F 1868; ISO 5085-1, 1989; ISO 11092, 1993), thermal mannequin, and human testing. -Physiological and sensory tests can also be used.

  Other details or advantages of the invention will become clearer with the examples given below.

  Form a series of polyamide articles, including comparative polyamide articles and control polyamide articles, and process performance, water wicking rate, water absorption rate, water drying rate, hygroscopicity, mechanical properties, IVN (viscosity index), ATG (terminal) Amino group) and CTG (carboxyl terminal group) are evaluated. Table 1 summarizes the samples.

Amino end group content (ATG)
The amino end group (ATG) content was determined by potentiometric titration. A 2 g quantity of polyamide is added to about 70 ml of about 90% by weight phenol. The mixture is kept at a temperature of 40 ° C. with continued stirring until the polyamide is completely dissolved. The solution is then titrated with 0.1 N HCl at about 25 ° C. Results are reported in eq / ton (eq / ton). When analyzing fibers and articles, any residue or spin finish must be removed beforehand.

Solution viscosity (IVN)
Determination of solution viscosity (IVN) is performed according to ISO307. The polyamide is dissolved in 90% by weight formic acid at 25 ° C. at a concentration of 0.005 g / ml and the flow time is measured. Results are reported as ml / g.

Carboxyl end group content (CTG)
The carboxyl end group content (CTG) was determined by a titration method. A quantity of 4 g of polyamide is added to about 80 ml of benzyl alcohol. The mixture is kept at a temperature of 200 ° C. while continuing to stir until the polyamide is completely dissolved. The solution is then titrated with 0.1 N potassium hydroxide in ethylene glycol. Results are reported in eq / ton (eq / ton). When analyzing fibers and articles, any residue or spin finish must be removed beforehand.

AATCC 195-Liquid moisture management of textile products (evaluation of horizontal water wicking rate and water absorption time)
Liquid moisture management characteristics are evaluated by sandwiching a dough specimen between two horizontal (upper and lower) electrode sensors. A predetermined amount of test solution that facilitates the measurement of the change in conductivity is dropped onto the center of the surface of the test specimen facing upward. The test solution is free to move in a three-dimensional direction, ie, radial spread at the top surface, movement through the sample from the top surface to the bottom surface, and radial spread at the bottom surface of the sample. During the test, the change in electrical resistance of the specimen is measured and recorded. This method uses a moisture management test meter (MMT). The water absorption result (seconds) and water diffusion rate (mm / second) are indicated by this method.

AATCC 199 Liquid Water Drying Rate Water is applied to the test specimen (0.1 ml) and then the specimen is placed on the scale and allowed to dry for 40 minutes. The drying rate is continuously monitored and recorded by the drying tester software. Results are reported in milligrams of water per minute sample area (mg / min * inch ² ).

Vertical wicking of AATCC 197 textiles Visually observe the speed (distance per unit time) of the liquid traveling along and / or through the vertical fabric specimen, manually timed and recorded at specific intervals To do. This test method considers the effect of gravity when assessing wicking.

Hygroscopicity Approximately 2 g of sample is placed in a weighed bottle and dried at 105 ° C. for 2 hours (weight W3). The weighed bottle is then placed in a climate test chamber at 20 ° C. and 65% RH for 24 hours. The sample is weighed again (weight W1). The weighed bottle is then placed in a climate test chamber at 30 ° C. and 90% RH for 24 hours. The sample is weighed again (weight W2). The hygroscopic delta is measured by the following formula: MRl = (Wl−W3) / W3, MR2 = (W2−W3) / W3. The difference in moisture absorption rate is obtained by Λ MR (%) = MR2−MR1.

Evaluation of texture The evaluation of touch was subjectively evaluated using "HESC Standard of Hand Evaluation-Second Edition". This is a technique developed by the “Hand Evaluation and Standardization Committee” of the Japan Textile Machinery Society. The sensation felt with the finger when the sample is touched by hand is evaluated by comparing it with a standardized reference sample of the method. These characteristics include “koshi”, “slim”, “bulge”, “soft”, “sharp”, “compressibility” and the like. An evaluation of THV (total texture value) of 1 to 5 is given, 5 is “very good” and 1 is “very bad”.

Examples AI-Multilobe-type cross-section studies Various multilobe-type cross-sections were investigated in light of melt spinning ability. Polyamide 6.6 pellets were used for the samples. Polyamide 6.6 pellets were produced by polymerization of a nylon salt containing mainly hexamethylenediamine and adipic acid. The IVN (viscosity index) measured by the method disclosed herein is 128-132, and the ATG (amine end group) is 40-45. Multifilament yarn was produced. A sample summary is shown in Table 2.

Examples 1-8-Raw yarn sample PA 5.6-Examples 1, 2, 3 and 6
Polyamide 5.6 fibers were made from polyamide 5.6 pellets using spinnerets with multilobe sections for Examples 2 and 3 or spinnerets with round orifices for Examples 1 and 6. Produced by melt spinning extrusion. Polyamide 5.6 pellets are polyamides commercially available from Cathay Biotech under the trademark Terryl®. The IVN measured by the method disclosed herein is 138-142, the ATG is 38-42, and the CTG is 65-75.

  In step a1, the polyamide composition was fed into the screw extruder inlet in the form of dry pellets. In step a2, the polyamide was melted, homogenized and pressed in a screw extruder at a temperature of about 290 ° C. and an extrusion pressure of about 50 bar. Thereafter, in step a3, the molten polyamide blend was spun into multifilament yarns at a spin pack pressure of about 200 bar and a spin pack flow rate of about 5 kg / hr. In step a4, the polyamide fiber blend was solidified and wound on a bobbin at about 4200 m / min.

PA 6.6-Examples 4, 5, and 7
Polyamide 6.6 fibers were melted from polyamide 6.6 pellets using a spinneret with a multilobe-shaped cross section for Example 5 or a spinneret with a round orifice for Examples 4 and 7. Prepared by spin extrusion in the same manner as described above in Examples 1, 2, 3, and 6.

  Polyamide 6.6 pellets were produced by polymerization of a nylon salt containing mainly hexamethylenediamine and adipic acid. The IVN (viscosity index) measured by the method disclosed herein is 128-132, and the ATG (amine end group) is 40-45.

PA 6.10-Example 8
Polyamide 6.10 fibers are produced in the same manner as described above in Examples 1, 2, 3, and 6 by melt spinning extrusion from polyamide 6.10 pellets using a spinneret containing a round orifice. did. Polyamide 6.10 pellets are polyamides commercially available from Solvay Group under the trademark STABAMID (copyright). The IVN measured by the method disclosed herein is 102-118 and the ATG is 49-57.

Examples 1.1-4.2-Textured yarn samples The multifilament yarns obtained above (Samples 1, 2, 4, 5, 6, and 7) are further textured to a linear density of 1x80f68 dtex ( For example, 1.1, 2.1, 4.1, 5.1, 6.1, and 7.1). The multifilament yarn obtained above (Samples 1 and 4) is further textured (eg 1.2 and 4.2) to a linear density of 2 × 80 f68 dtex.

  In all the above examples, similar knitted fabrics are produced for performing moisture management tests. Sample details and a summary of the mechanical results are shown in the table below.

Result 1. Investigation of workability of multilobe section

2. Investigation of water absorption of polyamide

3. Investigation of moisture management of raw yarn samples

4). Investigation of moisture management of textured yarn samples

5. Vertical wicking of fabric

6). Investigation of cross-sectional influence on texture

Conclusion Initially, multiple cross sections were examined to select the most appropriate one considering processability (Table 2). A multilobe arrangement with an angle between the lobes of 120 ° showed the best melt spinning performance (Samples A, B, C, D, F). On the other hand, a flat cross section or a cross section with small symmetry showed inferior workability (samples E, G, H). Therefore, samples “A” and “B” were used for the comfort management experiment of the present invention.

  Next, when the hygroscopicity of the three types of polyamides was analyzed, polyamide 5.6 showed the best results. In fact, it was found that the hygroscopicity was surprisingly high (5.1% in Table 3, sample 1.2).

  Thereafter, the moisture management properties named water absorption, water drying, and water wicking were investigated on the raw yarn. The results are summarized in Table 3. Comparing sample 2 (invention) and sample 4 (comparative example), water drying rate increased 79%, water absorption improved 89%, water wicking rate increased 26 times (or 2600%) Can be observed. Less coarse filament yarns (higher dtex per filament), such as 100f23, tend to be more uncomfortable to the skin than more thinner filament yarns (100f68). However, the results of Samples 6 and 7 (100f23) showed very good moisture management, eg 96% greater water absorption, 78 times greater water wicking rate due to the hygroscopic nature of polyamide 5.6. These are expected to be even larger by providing a multi-lobe cross section. Therefore, the wicking characteristics were greatly improved.

  The improved multi-lobe cross section plays a major role in this improvement, comparing sample 1 (control) and sample 2 (invention) with a 9% increase in water drying rate and a 40% increase in water absorption. And the water wicking rate was found to increase by 24%. The results for polyamide 6.10 (sample 8) are also shown as a comparison, with very poor results due to the very low hydrophilicity.

  The same properties were analyzed for the textured yarn (Table 5). Since textured yarns have more crimp, texture, bulk, stretch, and twist, they provide greater softness, comfort, thermal insulation and are more comfortable to the skin. Sample 2.1 (invention) and 4.1 (comparative) results showed an improvement in 15% water drying rate, 22% water absorption, and 46% water wicking rate. The multi-lobe type cross section also contributes to this improvement by comparing sample 1.1 and sample 2.1, with an increase in water drying rate of 9%, water absorption of 11% and wicking rate of 7%. is there. Less filament yarn (6.1) and 2x ply (1.2) results showed a significant improvement in relation to samples 7.1 and 4.2, respectively. The term 2x80f68 means that two yarns combine during the texturing process, so the resulting linear density is twice that of 1x80f68.

  A vertical wicking test was also conducted to further analyze the wicking characteristics considering gravity in order to understand the effect of the multilobe cross section. Again, a significant improvement was observed by comparing the results in Table 6 (Samples 1 and 2), which resulted in a surprising increase of 29%.

  From the results in Table 7, it can also be concluded that the cross-sectional profile of the present invention improves the texture and softness of the fiber due to the low bending stiffness, preferred bending direction, and lower yarn package density.

  Thus, according to this result, in the present invention, a novel polyamide having essential hygroscopic properties and comfort is disclosed, wherein the polyamide article is more when compared to a non-hygroscopic polyamide having a circular cross section. It can be seen that it exhibits a fast rate of water absorption, wicking, and drying. Furthermore, the synergistic effect of hygroscopicity, larger surface area cross-sections and capillarity accelerates the rate of water drying so that the wearer feels dry and comfortable even after intense sweating. The results are summarized below.

The overall advantages of polyamide fibers and articles made from these include the following:
-Optimal hygroscopicity to absorb sweat without a wet feel and maintain the ideal garment climate insulation.
-Enhanced wicking speed to efficiently carry sweat away from the skin.
-Fast drying speed to keep skin dry and avoid unpleasant chilly sensations after exercise.
-The mechanical and chemical properties of the polyamide article are not significantly changed.
-This method is simple and utilizes conventional known extrusion equipment.
-The cross-sectional profile of the present invention also greatly improves the feel and softness of the fibers due to the novel multi-lobe features disclosed.

Claims (21)

  Polyamide 5. Having improved comfort management, including hygroscopic polyamide, a bio-based aliphatic polyamide, selected from the group consisting of X (where X is an integer from 4 to 16) and mixtures thereof A polyamide fiber having a multilobe-shaped cross section characterized by having at least two coalesced centers and at least five equally sized elliptical lobes, wherein each coalesced center is said adjacent Polyamide fiber connecting at least three equal sized elliptical lobes according to angular symmetry between equal sized elliptical lobes.   4. The hygroscopic polyamide is polyamide 2. Polyamide fiber according to claim 1, wherein X is an even number from 4 to 16, preferably 6 or 10, wherein X is X.   The polyamide fiber according to claim 1 or 2, wherein the hygroscopic polyamide is polyamide 5.6.   The polyamide fiber according to any one of claims 1 to 3, comprising more than 75% by weight, preferably more than 85% by weight, more preferably more than 95% by weight of hygroscopic polyamide, based on the total weight of the fibers.   The multilobe-shaped cross section has 2-6 merged centers, each merged center having 3 or 4 equally sized elliptical lobes according to an angle of 120 ° or 90 °, respectively, between adjacent lobes The polyamide fibers according to any one of claims 1 to 4, which are connected symmetrically.   The multilobe-shaped cross section has 2-6 merged centers, each merged center symmetrically connecting three equally sized elliptical lobes according to a 120 ° angle between adjacent lobes. The polyamide fiber according to any one of claims 1 to 5.   The multilobe-shaped cross section has two or three merged centers, and each merged center symmetrically connects three equally sized elliptical lobes according to a 120 ° angle between adjacent lobes. The polyamide fiber according to any one of claims 1 to 6.   A method for obtaining a polyamide fiber having improved comfort management according to any one of claims 1 to 7, wherein the polyamide fiber is according to any one of claims 1 to 4. A process obtainable by melt spinning extrusion of a polyamide composition comprising a hygroscopic polyamide. The melt spinning extrusion comprises the following steps:
a1. Feeding the polyamide composition comprising the hygroscopic polyamide in the form of a melt, pellets or powder into the inlet of a screw extruder;
a2. Melting, homogenizing and pressing the polyamide composition;
a3. Spinning the molten polyamide composition into fibers;
a4. Cooling and winding the fiber,
Step a3 is accomplished through at least one spinneret that includes multi-lobe type orifices, each orifice having at least two coalesced centers, at least five equally sized elliptical lobes, and adjacent equal sized ellipses. Have angular symmetry between the lobes,
9. The fiber of claim 8, wherein the fibers are obtained by coalescence and each coalesced center connects at least three equal sized elliptical lobes according to angular symmetry between the adjacent equal sized elliptical lobes. Method.   The multilobe-shaped orifice has 2-6 merged centers, each merged center having 3 or 4 equally sized elliptical lobes according to an angle of 120 ° or 90 °, respectively, between adjacent lobes 10. The method of claim 9, wherein the are connected symmetrically.   The multi-lobe type orifice has 2-6 merged centers, each merged center symmetrically connecting three equally sized elliptical lobes according to a 120 ° angle between adjacent lobes. The method according to claim 9.   The multi-lobe type orifice has two or three merged centers, each merged center symmetrically connecting three equally sized elliptical lobes according to a 120 ° angle between adjacent lobes. The method according to claim 9. Next step:
b1. The fiber is removed from the package and passed through a delivery roll;
b2. The fiber passes through a heater and then enters a cold zone;
b3. Passing the fibers through a spindle containing a rotating disk (friction aggregation);
b4. A step of confounding points and coning oil applied to the fibers;
b5. 13. The yarn according to any one of claims 8 to 12, further comprising a false twisting process comprising the step of winding the fiber onto a bobbin, wherein the yarn is given a draw ratio by changing the speed ratio between step b1 and step b5. The method according to one item.   A polyamide article comprising polyamide fibers having improved comfort management, according to any one of claims 1 to 7, or obtained from a method according to any one of claims 8 to 13.   The polyamide article is manufactured from a polyamide fiber having improved comfort management, according to any one of claims 1 to 7, or obtained from a method according to any one of claims 8 to 13. 15. A polyamide article according to claim 14, which is a fiber, staple fiber, flock, woven fabric, knitted fabric or nonwoven fabric, or a textile article.   Raw with a tensile strength of 20-80 cN / Tex (at break), 20-90% elongation (at break), linear density of 40-300 dtex, and dtex per filament of 0.1-5.0 16. A polyamide article according to claim 14 or 15 which is a multifilament yarn of or of textured. A fabric, the mass per unit area of the polyamide fabric is less than 200 g / ^{m 2,} preferably less than 150 g / ^{m 2,} polyamide article according to claim 14 or 15.   18. A polyamide article according to any one of claims 14 to 17, which is a fiber article or part of a fiber article and occupies at least 30% by weight of the total weight of the fiber article.   A polyamide fiber with improved comfort management, obtained from the method according to any one of claims 1 to 7 or obtained from any one of claims 8 to 13, is warped, knitted, 19. A method for obtaining a polyamide article according to any one of claims 14 to 18 which is transformed by weaving, non-woven processing, sewing or a combination thereof.   In order to improve the comfort management of the polyamide articles produced therefrom, of the polyamide fibers according to any one of claims 1 to 7 or obtained from the method according to any one of claims 8 to 13. Use of.   21. Use according to claim 20, wherein the polyamide article is a textile article.