KR20180045023A - Polyamide fibers having improved comfort management ability, a method for producing the same, and articles made therefrom - Google Patents

Abstract

The present invention relates to polyamide fibers having improved comfort management capabilities. The present invention also discloses methods of obtaining such fibers and articles made therefrom. Polyamide fibers are made from hygroscopic polyamides with a multi-lobe cross-sectional profile. Hygroscopic polyamide fibers are preferably made from polyamide 5.X, where X is an integer from 4 to 16. Most preferably polyamide 5.6, which is a bio-based polyamide made from pentamethylenediamine and derived from a sugar-based renewable feedstock. Accordingly, the present invention relates to polyamide fibers having improved moisture absorption, wicking and drying characteristics, in which sweat is transported outward from the skin and dried quickly, thereby reducing moist sensation and cold during activity, and sportswear and leisure wear Of the article. The present invention provides pleasantness and comfort by maintaining pleasant skin temperature and fine weather.

Description

Polyamide fibers having improved comfort management ability, a method for producing the same, and articles made therefrom

There is an increasing demand for comfort in sports wear and leisure wear. According to World Sports Activewear, "comfort is the most important thing in apparel," which is one of what consumers expect. Comfort affects performance and efficiency as well as well-being of the wearer. For example, if an active athlete wears poorly breathable clothing, heart rate and rectal temperature will increase much faster than wearing breathable sportswear.

Polyamide fibers are among the commercially available synthetic fibers most suitable for improving the comfort. The polyamide is very soft and smooth and has a good feel to the skin. Excellent stretchability, light weight and high abrasion resistance provide a very pleasant feel, in addition to well-balanced moisture behavior. Polyamides are also excellent in durability, have excellent physical and chemical properties, are easy to clean, and have quick drying properties.

Polyamides, also known as nylons, are linear condensation polymers consisting of repeated primary bonds of the amide group. The amide group, - (- CO - NH -) -, provides hydrogen bonding between polyamide intermolecular chains. Polyamide fibers are generally produced by melt spin extrusion and are provided in the form of staple fibers, tows, monofilaments, multifilaments, plain weave or textured fabrics.

Therefore, polyamides are candidates for sportswear, underwear, leisure wear and other garments that directly touch the skin. A fabric that touches directly to the skin is a soft, skin-friendly fabric, usually composed of hydrophilic and / or porous fibers, designed to suck up sweat from the body while keeping the microclimate of the skin pleasant do. Sweating is a necessary mechanism to cool the body in response to a high level of body heat generation. The skin's microclimate is rapidly humid during sweating. For efficient cooling, the evaporated sweat should be transported as water vapor through clothing and air layers adjacent to the skin and / or by convection through the apertures in the garment.

Textiles that touch skin directly control the skin's microclimate temperature and humidity. If metabolic activity is reduced, the microclimate is retained by the stagnant air, so the movement of air in the fabric must be reduced. As metabolism increases, heat and moisture must be transported from the fabric to cool the skin. Moisture control is then carried out by absorption, by movement or by ventilation.

Absorption can reduce skin humidity and limit sweating in daily activities while maintaining relatively pleasantness. On the other hand, in high metabolic activity and intense sweating, the moisture can stay in the clothing system, the wetting of the clothing can reduce the adiabatic effect, And cause a chilling effect after inactivity, which may later be harmful to thermal balance. Therefore, in the case of a lot of sweat, the transportation principle must be applied, in which sweat is transported from the skin by wicking and capillarity, thereby drying the skin.

Synthetic fibers are durable and easy to clean, but mostly hydrophobic. The use of a hydrophobic fabric that touches directly to the skin should be designed to rapidly transfer moisture through the capillary space between the fibers and the yarn, as sweating raises the moisture rapidly. On the other hand, hydrophilic and / or hygroscopic fibers absorb and transport water through the fibers themselves and by capillary action, thereby promoting evaporation.

High hygroscopic fibers also lead to an increase in drying time which is physiologically problematic. If the drying time is too long, the post-exercise chilling effect will be inevitable because the sweaty shirt will lose its insulation. This mechanism is usually found in natural and regenerated fibers due to its high hydrophilicity. In addition, wet skin can cause skin irritation or even wet skin dermatitis.

For example, wool has a high absorption capacity and can control a small amount of moisture without loss of adiabatic properties. Wool can be used as a fabric that touches the skin directly, and can keep the skin relatively dry. However, when the fabric is saturated, moisture control is reduced. Cotton has excellent properties for garments that are worn only in a limited amount of sweaty normal climatic conditions. In this situation, the cotton can lessen the sweat stimulus to a lesser extent, thus keeping the microclimate drier and more pleasant. However, in the sport fabric industry, which produces sweat which is a greater amount of liquid for an extended period of time; The face is only recommended on the outer face of the double-sided material and in combination with the inner synthetic face of the skin. When cotton is used as the sole or main fiber element, the fabric is soaked with water and rapidly wetted and sticks to the body.

Moisture absorbed into clothing gradually reduces the insulation. If activity ceases and sweating ceases, drying of the wet garment layer will take more heat away from the body than is produced by the metabolic rate, and the result is a post-exercise period that can be detrimental to thermal balance, resulting in hypothermia. A short period of time after exercise can be prevented by a short drying time. Indeed, short drying times are one of the key preconditions for the excellent wearing comfort of sportswear.

In summary, to effectively maintain a pleasant microclimate and comfort, fabrics require moderate hydrophilicity, high wicking speed and fast drying speed. If the hydrophilicity is too high, as in the case of natural fibers, the drying speed may be delayed because the water is absorbed and stays in the fiber for a longer period of time. Poor wicking can also result in saturation zones, and reduced transport and drying rates. Therefore, an optimal balance between hydrophilicity, wicking and fast drying properties must be achieved.

There has been considerable research to improve the moisture management of polyamide fabrics. Several approaches have been made, such as the addition of a hydrophilic material in a fiber matrix or on a fiber surface such as polyvinylpyrrolidone (PVP) and ethoxylated polyamide; Or in bi-component melt extrusion of polyamides and another hydrophilic polymer have been applied. An example of a sheath-core polyamide multifilament in which a polyalkylene oxide modified product is used as a core material is disclosed in JP 2012211406. This approach requires dual equipment and does not provide drying speed and wicking speed.

In another approach, a coolant is inserted into the polyamide fiber matrix to improve cooling and moisture management characteristics. Chinese patent applications CN 104178839 and CN 103088459 disclose this method. Disadvantages of this approach include a lack of fast drying rates, moisture absorption and wicking speed. The cooling mechanism may also result in unpleasant sensations during activity sweating, for example hypothermia due to excessive cooling.

Chinese patent application CN103882550 also proposes cooled polyamide fibers using a coolant, such as inorganic metal oxide particles, but PVP is added to the fibers for the purpose of improving water absorption. A disadvantage of using PVP is that the occurrence of pyrrolidone as a by-product tends to cause yellowing of the fibers, thereby affecting the mechanical and chemical properties desirable for fabric application. In addition, rapid wicking and drying may not occur and may cause discomfort during sweating and sporting activities.

Several patents have attempted to provide moisture control polyamide fibers by only changing the fiber cross-section. Filaments with cross-sections other than circular are usually proposed for aesthetic effects, moisture management and light weight. Examples of non-circular profiles include "dog bone", "trilobal", "zig-zag", "king", "flat" quot; hollow "propyl. This approach aims to increase the capillary effect by introducing grooves and microchannels in the longitudinal direction of the filament, creating a space in and between the fibers. For example, a triple lobe profile (also known as Y) is well known and widely used to provide shine and gloss to an article; It does not provide deep microchannels and thus does not increase capillary action, softness and surface area. JP 5206640 discloses a modified cross-section polyamide having a radial lobe; Moisture absorption, wicking and drying rates are not evaluated or improved.

 US 2015013047 discloses a cooled polyamide yarn using a cooling inorganic additive, a modified cross section and a low crimp module. The disclosed cross section is a flat cross section. The disadvantage of this section is the fact that flat fiber profiles can result in wider skin coverage, lower thermal insulation, less trapped air and more points of contact for the skin, thus reducing wearing comfort of the skin senses. This does not provide capillary action and does not increase wicking and drying speeds and is therefore not suitable for high sweating activity. In addition, the flattened section evaluated in the experiments of the present invention exhibits a poor treatment mode, suggesting that the flattened section may be more difficult to process with melt spinning.

Finally, EP 2554721 discloses hygroscopic polyamide 5.6 fibers; This has the additional advantage of fast wicking speed and drying speed as provided by the present invention. Thus, patent EP 2554721 does not provide a solution to the comfort management of sportswear fabrics in which wicking and fast drying speeds are desired.

Fibers that simultaneously provide hydrophilicity, cooling effect, and wicking are not yet commercially available.

In view of the above, there is a need for synthetic fibers having inherently improved comfort management characteristics that resemble the softness and comfort of natural fibers with the added benefit of fast drying and wicking properties.

- Optimum hygroscopicity to absorb perspiration without feeling damp and to maintain ideal microclimate insulation;

Improved wicking speed for effectively transporting and exporting sweat from the skin;

- fast drying speed , to keep skin dry and to avoid chills after unpleasant exercise;

- Comfort of skin sensation to obtain comfortable touch due to woven multi filament yarn with very fine filaments

There is also a need to provide a solution for having a pleasant polyamide fabric comprising a polyamide fabric.

Therefore, an object of the present invention is to provide a polyamide fiber, a method for producing the same, and an article made therefrom, which has superior comfort management properties, thereby improving skin micro climate and producing a pleasant feeling during sports and high perspiration activity .

The present invention is a solution for obtaining a polyamide fiber having high comfort and freshness in order to provide a comfortable feeling to a wearer.

Thus, the present invention is a polyamide 5.X (where X is an integer of 4 to 16) and a bio-based aliphatic polyamide is selected from the group consisting of a mixture thereof, a polyamide fiber having improved comfort management capability including a hygroscopic polyamide Wherein the fibers have at least two mating centers and at least five rectangular lobes of the same dimensions and each mating center has at least three rectangular lobes of the same dimension according to angular symmetry between adjacent rectangular lobes of the same dimension to it characterized in that the connection has a multi-probe (multilobal) cross-section.

Surprisingly, it has been found that such polyamide fibers exhibit significantly higher hygroscopicity, moisture drying rate, water diffusion rate and moisture absorption than non-hygroscopic polyamides having a round cross-section. It has been proven that by improving the water absorption, wicking and drying speed, it leads to better moisture management and also substantially improves the comfort.

The present invention is also directed to a process for obtaining said polyamide fibers having improved comfort management ability , wherein the polyamide fibers are made of polyamide fibers comprising hygroscopic polyamides, for example, using spinning processes of new multi- By melt-spin extrusion of the composition.

The present invention also relates to polyamide articles comprising polyamide fibers having improved comfort management as defined above and below in the following paragraphs; And a method of obtaining such a polyamide article , wherein the polyamide fibers of the present invention are used for texturing, drawing, warping, knitting, weaving, nonwoven processing, Is modified by a combination.

A further subject of the present invention is the use of said polyamide fibers having improved comfort management capabilities as defined above and below in the following paragraphs to provide a comfort management for polyamide articles, It is to increase ability.

Justice

In the context of the present invention, the expression "polyamide fibers" is a generic term including fibers, monofilaments, multifilaments and yarn-like articles. According to the present invention, a "polyamide article" is a modified or treated polyamide fiber, a staple fiber made of polyamide fibers, any flock or any fabric component, Or garments. In the following description, the terms "fiber", "yarn" and "filament" may be used as long as the meaning of the present invention is not changed.

Polyamide fibers with improved comfort management

The present invention relates to a polyamide fiber having improved comfort management ability, comprising a hygroscopic polyamide which is a bio-based aliphatic polyamide selected from the group consisting of polyamide 5.X (where X is an integer of 4 to 16) Wherein the fibers have at least two mating centers and at least five identical sized rectangular lobes, each mating center connecting at least three identical-sized rectangular lobes according to an angular symmetry between adjacent equal-sized rectangular lobes characterized in that has a multi-lobe cross-section.

Hygroscopic polyamide

The hygroscopic polyamide is an aliphatic polyamide composed of polyamide 5.X (where X is an integer of 4 to 16) or a mixture thereof.

Polyamide 5.X is composed of pentamethylenediamine and aliphatic dicarboxylic acid (s) as raw materials. Possible dicarboxylic acid lists include: butanedioic acid (succinic acid), pentanedioic acid (glutaric acid), hexanedioic acid (adipic acid), heptanedioic acid (pimelic acid) Nonanedioic acid (azelaic acid), decanedioic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid. All of these disposals are available for purchase.

Polyamide 5.X has the advantage that it can be prepared from biomass according to ASTM 6866. Penta methylenediamine can also be prepared from biological sources according to ASTM 6866, and the polyamides produced can be generated from 40% to 100% of biological resources.

The amino end group (ATG) content of such bio-based polyamides is advantageously 25 to 60 equivalents / ton and the carboxyl end groups (CTG) advantageously 45 to 90 equivalents / ton. The content of such amino / carboxyl end groups is determined according to the method described in the following experimental part.

The hygroscopic polyamide is preferably a polyamide 5.X wherein X is an even integer of 4 to 16, such as polyamide 5.4, polyamide 5.6, polyamide 5.8, polyamide 5.10, polyamide 5.12, polyamide 5.14 , Polyamide 5.16, and mixtures thereof. More preferably, X is 6 or 10, advantageously 6, such as polyamide 5.6 (nylon 5.6) also referred to as poly (pentamethylene adipamide), which is a polycondensation reaction of pentamethylenediamine and adipic acid as a raw material .

The preferred polyamide 5.6 may have a viscosity index (IVN) ranging from 100 to 200 ml / g, preferably from about 120 to 170 ml / g. This IVN is measured according to the ISO 307 standard, which is described later in the experimental part.

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

The hygroscopic behavior of the polyamide 5.6 is at least 4%, as measured according to the method described in the experimental part below. Hygroscopicity is an odd number of diamines (5 carbons) and diacids (6 carbons), which leads to misalignment of intermolecular bonds and leads to fewer hydrogen bond numbers and thus more water- / Even number array.

The polyamide fibers according to the invention advantageously comprise more than 75% by weight, preferably more than 85% by weight, more preferably more than 95% by weight, of hygroscopic polyamides, based on the total weight of the fibers.

Indeed, the polyamide fibers according to the invention may also contain other polymers such as PA 6.6, PA 6.10 and PA 6, and / or additives such as plasticizers, antioxidants, stabilizers (such as heat or light stabilizers), colorants, pigments, Antioxidants, antistatic additives, functional additives, photocatalytic agents, nanocapsules, antioxidants, antioxidants, antioxidants, antioxidants, antioxidants, antioxidants, An antimicrobial agent, an antidandrin agent, an antifungal agent or other conventional additives.

Generally, the amount of additive in the fibers corresponds to up to 25% by weight, more preferably up to 10% by weight.

In a further embodiment of the invention, a coolant or temperature controller is used. The coolant may be any far infrared ceramic powder, an inorganic filler such as an inorganic metal oxide such as TiO2, ZrO2, MgO, SnO2, ZnO, BaO, jade powder, zirconia powder, silica powder, mica, boron nitride, , Magnesium carbonate, aluminum silicate, alumina, zeolite, and talc. The temperature controlling agent also includes phase transfer materials such as paraffins or endothermic substances such as xylitol or sugar alcohol such as erythritol. A coolant or temperature modifier provides rapid thermal conduction through the body to create a cool feel through excellent thermal conductivity, slow endotherms and fast heat dissipation characteristics.

Multiple lobe section

The polyamide fibers of the present invention have at least two mating centers and at least five identical dimensional rectangular lobes, each mating center having at least three identical dimensional rectangular lobes connected according to angular symmetry between adjacent equal- Lt; RTI ID = 0.0 > lobe < / RTI >

In the polyamide fibers according to the invention, a "lobe" is understood to be a rectangular section / section of a fiber cross-section connected with at least one mating center.

In the polyamide fibers according to the present invention, "cohesion center" is understood as a point where at least three lobes meet.

According to a preferred embodiment, the multi-lob cross section has two to six, preferably two or three, coalescent centers, each coalescent center comprising three or twelve lobes at an angle of 120 ° or 90 ° respectively between adjacent lobes, The best results are obtained when four equally dimensioned rectangular lobes are symmetrically connected and three co-dimensional rectangular lobes are symmetrically connected at an angle of 120 [deg.] Between adjacent lobes.

A schematic example of a multiple lobe section is shown in Fig. In Figure 1, there are three center of co-ordinates indicated by the letter a, b represents a lobe, in this particular example there are 7 lobes, and c represents an angle formed between each adjacent lobe of 120 degrees.

Other cross sectional profiles are illustrated in FIG. 3, wherein the profiles according to the present invention are illustrated as "A" to "F" (120 ° symmetry) and "I" and "J" (90 ° symmetry). Profiles "G", "H", and "K" are presented solely for comparison.

If there are multiple lobe sections with at least two lumen centers and three lobes arranged at an angle of 120 degrees symmetrically, then all adjacent lobes are connected at an angle of 120 °. For example, two coalescent centers have a total of five lobes, three coalescent centers have a total of seven lobes, and so on. For the "N" coalescent centers, the number of lobes is "(N * 2) + 1".

A multiple lobe section with at least two lumen centers with four lobes arranged angularly symmetrically at 90 degrees means that any adjacent lobes are connected at 90 degrees. For example, two coalescent centers connect seven lobes, and three coalescent centers connect ten lobes. For any "M" coalescent centers, the number of lobes is "(M * 3) + 1". The lobes are symmetrically angled, meaning that any adjacent lobes are connected at 90 degrees.

Therefore, the total number of cross-section lobes may be five (images "A" in FIG. 3) to thirteen (image "F" in FIG. 3). The highest cross-sectional sharpness and processability are obtained when two cross-sections (image "A" in FIG. 3) and three cross-sections (three cross- "B").

Asymmetric cross-sections, e. G. Samples " G " and "H" of Fig. 3 show poor processability and should be avoided. This cross section is only presented for comparison, and also the sample "K" in Fig. 3 is a conventional round cross section and does not belong to the present invention. In general, flat sections such as "G" and "H"

The specific multi-lobe section of the present invention creates a particularly fine, continuous recess in the longitudinal direction of the fiber. The capillary action and large surface area of the fibers of the present invention increase the rate of moisture absorption, diffusion and drying, thereby improving the moisture management and comfort of the fabrics produced thereby. If a less compressed yarn is obtained, it contributes to more air space in the filament, thereby increasing the adiabatic, capillary, and thermal control of the fabric produced thereby.

The large surface area of the cross section of the present invention allows sweat to spread around, which contributes significantly to faster evaporation of sweat, so that the fabric product made therefrom dries more quickly and the wearer is more comfortable and dries during exercise do. Thus, the insulation of the fabric product made therefrom is maintained, which prevents cold after the movement of the sweat-absorbent garment.

In contrast to the elastic action of the round cross section (Y-shaped) of the triple lobes, handling and softness are also greatly improved because of the lower bending stiffness produced by the irregular and preferred bending direction of the cross section. Similarities to softness are also observed in the "kidney bean" section of cotton fibers. For example, the image "B" in FIG. 3 has a preferred bending direction toward a deeper recess.

Advantageously, the polyamide fibers according to the present invention have a total dtex of about 40 to about 300, a dpf (dtex per filament) of about 0.1 to about 5, a toughness (tear strength) of 20 to 80 cN / % (At break).

Method for obtaining polyamide fiber having improved comfort management ability

First embodiment: Flat yarn

The present invention also provides a method for obtaining a polyamide fiber having improved comfort management ability as described above. The polyamide fibers are obtained by melt spin extrusion. "Melting spin extrusion" is understood to mean an extrusion process for converting a polyamide into a polyamide fiber. The polyamide may be supplied to the melt spinning apparatus in the form of pellets, powder or melt. The present methods include any conventional extrusion spinning means suitable for melt spin extrusion of polyamides, such means as single screw extruders, twin screw extruders, binary extruders and grid spinning heads are well known to those skilled in the art. The melt spinning extrusion can be carried out by using LOY (Low-Oriented Yarn), POY (Partially Oriented Yarn), FDY (Full Drawn Yarn), FOY (Fully Oriented Yarn) Denier industrial, or HDI (High Denier Industrial).

The melt spin extrusion advantageously comprises the following steps:

a1. Feeding the polyamide composition comprising the hygroscopic polyamide to the inlet of the screw extruder in the form of a melt, pellet or powder.

a2. Melting, homogenizing and pressing the polyamide composition.

a3. Spinning the molten polyamide composition onto the fiber.

a4. Cooling and winding the fiber.

In step a1, the hygroscopic polyamide is advantageously introduced continuously into the entrance of the screw extruder as a melt, pellet or powder. In step a2, the polyamide is preferably melted, homogenized and pressed inside a screw extruder, preferably at a temperature of 260 DEG C to 310 DEG C, and preferably at an extrusion pressure of 30 to 70 bar, which is above the melting temperature of the polyamide .

Then, in accordance with step a3, the molten polyamide is heated to a temperature of from 260 to 310 DEG C, preferably from 150 to 250 DEG C, using a spinning screen-pack comprising a filtering component and a spinneret bar at a spinning pack pressure of 3 to 8 kg / h and a spin pack flow rate of 3 to 8 kg / h.

A special spinneret should be used during step a3 to obtain a multi-lobe section with a center of gravity, a rectangular lobe of the same dimension and angular symmetry.

The spinneret is a metal plate containing an orifice that is used to extrude the polymer to have the desired cross-section and size.

The special spinning projections include multiple lobe apertures, each of which has an angular symmetry between at least two mating centers, at least five identical dimension rectangular lobes and adjacent identical dimension rectangular lobes.

The multiple lobe holes preferably have two to six lumen centers, each lumen center symmetrically connecting three or four identical dimensional rectangular lobes at an angle of 120 or 90 degrees between adjacent lobes, respectively do.

A plurality of lobes having two to six lapping centers, preferably two or three lapping centers, each lapping center symmetrically connecting three identical-dimension rectangular lobes at an angle of 120 [deg.] Between adjacent lobes The best results are obtained.

A schematic example of a special spinneret hole is provided in Fig. In Fig. 2, there are three center of co-ordinates indicated by the letter a, b represents a lobe, in this particular example there are seven lobes, and c represents an angle of 120 degrees formed between each adjacent lobe.

For each hole in the spinneret according to the present invention, a "lobe" means that the molten polymer passes there through during extrusion to form solid filaments upon cooling and to form a rectangular section / It is understood to be a hole.

For each hole in the spinneret according to the present invention, the "mating center" is understood to be the point of connection of at least three lobes through which the molten polymer passes during the extrusion but which will connect at least three lobes after mating.

The coalescent center of the spinneret hole and the same dimension rectangular lobe are required to obtain good polymer dispersion in the hole during extrusion, while angular symmetry ensures the stability, shape and sharpness of the cross section and improves the groove and capillary action of the fibers .

A multi lobe section having a lap center of three lobes connected at an angle of 120 [deg.] Is shown in the image "A" The multi lobe section with the lumped center of the four lobes connected at an angle of 90 is shown in the images "I" and " J "

The coalescence phenomenon is well understood by those skilled in the art and is a process in which two or more distinct compartments (also called lobes) are merged into one compartment during contact. Thus, the lobes are not interconnected within the spinnerets; Instead, the lobe compartment is merged upon extrusion to form one continuous filament. The coalescent center then becomes the center of a separate lobe, especially three or four lobes according to the invention.

The best cross-sectional sharpness and processability is achieved with a symmetrical profile with an angle of 120 [deg.] Between adjacent lobes. More specifically, the cross-section of the center of the coalescence of two (sample "A") and three (sample "B") has "five lobes" and "seven lobes", respectively.

Each set of lobs from the sample of Fig. 3 corresponds to one continuous filament upon extrusion coupled by coalescence. The total number of holes (lobes) in the spinneret can be designed to produce yarns from 10 to 200 filaments. The lobes have a rectangular shape and are exactly the same size.

Step a4 is a step of cooling the fiber (or yarn or filament) to a solidified state and winding the polyamide fiber on the bobbin. Spinning oil may also be added to the fibers at this stage. The winding speed is from 3000 m / min to 6500 m / min.

In the present invention, the extruder of step a1 and / or a2 and / or a3 may be equipped with a metering system for introducing an additive such as a polymer and optionally a master batch into the main polymer.

Additional additives may be introduced during the process of the present invention or may be present in the hygroscopic polyamide polymer. The additives are listed above. These additives are generally added in an amount of 0.001% to 10% based on the weight of the polyamide fibers in the polymer or in stages a1 and / or a4 of melt spin extrusion.

In a further embodiment of the invention, a coolant or a temperature control agent is introduced in step a1, in addition to the hygroscopic polyamide, using an injection device, such as a unit of weight or volume unit feed pump. The coolant or temperature controlling agent may be in the form of a powder, liquid or solid masterbatch. The coolant or temperature controlling agent is advantageously introduced in an amount of from 0.5% by weight to 20.0% by weight, preferably from 1.0% by weight to 5.0% by weight, based on the total weight of the polyamide fibers.

Second embodiment: Texture room

According to a second embodiment of the invention, the polyamide fibers obtained from the first embodiment are subsequently textured to produce textured yarns with higher elasticity, volume and flexibility. This method includes any of the techniques known to those skilled in the art, such as false-twist texturizing, false-twist-fixed texturizing, and air injection texturing. Twist texturing is most desirable.

The method may include the following steps:

b1. Removing the fibers from the package and passing them through a delivery roll.

b2. Passing the fibers through a heater and then sending them to a cooling zone.

b3. Passing the fibers through a spindle comprising a rotating disk (friction aggregates).

b4. Applying an intermingling point and a corning oil to the fibers.

b5. Winding the fiber onto the bobbin.

Where the drawing ratio is provided to the fibers by changing the speed ratio of b1 and b5.

In step b1, the fibers are advantageously placed in a creel and unwound from the bobbin by a delivery roll. Step b2 preferably comprises passing the fibers through a heater at a temperature of between 120 DEG C and 400 DEG C to aid in the mechanical work of stretching and twisting the fibers by softening (making them more stretchable). The fibers are then cooled.

Step b3 is the step of creating twist, volume, crease and texture of the fibers. The amount of kink varies by varying the speed of the disk, the disk arrangement, and the D / Y relationship. The D / Y ratio changes the speed ratio between the friction discs and the linear velocity of the fibers. This ratio is preferably 1.0 to 2.8. The disk arrangement is advantageously 1/2/1 to 1/8/1 of the guide disk / working disk / guide disk.

According to step b4, in the case of mixing, the mixing point and the corning oil are applied to the fiber to provide lubrication and improve physical and aesthetic properties. The interlacing per meter is preferably at least 30 times per meter. Step b5 is a winding process, wherein the fiber is wound into a bobbin; The winding speed can vary from 150 m / min to 1500 m / min.

The drawing ratio is provided to the fiber by changing the speed ratio of step b1 and step b5, and is an important parameter of the method for achieving the desired linear density. The draw ratio is advantageously between 1.10 and 4.00. A yarn of 1 ply or more, for example 1 to 8 ply, is possible.

Polyamide article

The polyamide fibers according to the invention can then be modified into polyamide articles, in particular woven fabrics and / or garments. The polyamide article according to the invention is preferably made of a polyamide fiber of the invention (as defined above), or a fiber, multifilament yarn, debris, woven, knitted or nonwoven fabric obtained from the process according to the invention It is a fabric article.

The fabric article may be any fabric article, including, but not limited to, woven fabrics, knitted fabrics, nonwoven fabrics, ropes, strings, In the case of garments, the best results are achieved on a fabric having a mass per unit area of less than 200 g / m 2, most preferably less than 150 g / m 2.

Method for obtaining a polyamide article

Methods of transforming polyamide fibers into polyamide articles such as fabric cloths or garments are well known to those skilled in the art. Indeed, the polyamide fibers can be modified into polyamide articles by texturing, drawing, canning, knitting, weaving, nonwoven processing, garment making, or a combination thereof. These articles are subsequently used in a number of applications, specifically socks, underwear, sportswear, outerwear and leisure wear.

advantage

Additional advantages of polyamide fibers and articles made therefrom with improved comfort management capabilities in accordance with the present invention are highlighted below:

- New polyamide 5.6 fibers having inherent hygroscopicity and capillary effect are disclosed in the present invention. Which is contrary to commercially available chemically modified hydrophilic polyamides.

New multi-lobe section profiles are disclosed in the present invention.

The present polyamide article exhibits a higher water uptake, wicking and drying as compared to non-hygroscopic polyamides of round cross section.

The synergistic effect of cross-sectional hygroscopicity, capillary action and larger surface area increases the rate of moisture drying, so that the wearer feels dry and comfortable even after severe sweating.

The mechanical and chemical properties of the polyamide article are not significantly changed.

The process uses a simple, conventional and known extrusion machine.

The cross sectional profile of the present invention improves the handling and flexibility of the fiber due to the lower bending stiffness due to the irregular and preferred bending direction, as opposed to the elastic action of the round and triple lobe sections. A similar phenomenon is observed in the "kidney bean" section of the fiber.

Wear comfort background and evaluation method

Wear comfort is a complex phenomenon, but can generally be divided into four different main aspects: a) warm physiological wear Comfort affects the temperature control of a person, including the heat and water transport process through clothing. The core concepts include insulation, ventilation and moisture management capabilities; b) Skin Sensitivity Wear comfort characterizes physical sensations resulting from direct contact with the skin, pleasant sensations include smoothness and suppleness, while itching, uncomfortable sensations are associated with excessive stiffness, or sweaty skin will be; c) Ergonomic wearing Comfort is the freedom of the pit of the garment and the freedom it allows. This mainly depends on the pattern of the garment and the elasticity of the material; d) Psychological wear Comfort is influenced by fashion, personal preference, ideology and so on.

Thermal physiological comfort is based on energy conservation principles. All energy produced by metabolism in the body is produced by the heat flow from dry heat flow including respiratory heat loss (breathing), radiation, conduction, convection, and sweating evaporation, Should disappear. If there is more energy produced than disappearing, the body suffers from hyperthermia. Excessive heat loss also causes hypothermia.

Wear comfort is not the result of just one single parameter; Instead, it is the result of fiber composition, fabric structure, garment layer system, chemical finish, and so on. Several studies have demonstrated that fabric parameters and chemical finishes are as important as fiber composition. For example, in addition to hydrophilic and fast drying properties, lightweight, porous, and thin fabrics are desirable for sports fabrics. The water vapor diffuses through the room space, through the interfiber space, through the fiber material itself, and through the free air space within the fabric.

Chemical finishes include treatment of mainly hydrophilic themes and are intended to increase the hydrophilic action of the hydrophobic fabric. The disadvantage of chemical finishes is the fact that they are non-durable treatments and can only last for a few home washes, whereas fibers with inherently moisture control properties last for the entire life of the fabric article.

For yarn compositions, the use of filament yarns makes the surface of the fabric directly touching the skin too smooth and flat. This structure represents a point of contact with too much skin, which is thought to stick to the skin, which is too smooth and sweaty. Flat filament yarns provide a poor skin sensation, while spinning yarns or textured yarns provide a better skin feel. Texture yarns provide fewer skin contact points, higher insulation, suppleness and a pleasant feel. In the spinning room and texture room, not only the protruding fiber ends, but also more three-dimensional structures are created, which serve as a spacer between the skin and the fabric. The cross-section of the yarn with grooves, voids, and capillary channels along the filaments also increases the wicking speed and surface area, which is important to cause wicking and fast drying rates.

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

Moisture management properties are usually assessed by moisture absorption, vertical wicking, horizontal wicking, air permeability, water vapor transmission, heat resistance and drying speed. The standard AATCC 195 from "American Association of Chemists and Colorists" may be used to determine the liquid water management properties of fabrics. Water absorption can be assessed by AATCC 79. The vertical wicking of the fabric is usually evaluated by AATCC 197 while the horizontal wicking can be measured by AATCC 198. AATCC 199 and AATCC 200 can be used to measure the drying time of the fabric, using a weight unit moisture analyzer under different conditions. Apart from the above method, thermo-physiological and sensory tests for comfort evaluation may be applied not only to thermal mannequins but also to human subjects, such as heated hot plates (ASTM F 1868; ISO 5085-1, 1989 ; ISO 11092, 1993).

Other details or advantages of the present invention will become more apparent with reference to the following examples.

Example

A wetting rate, a moisture drying rate, a moisture absorption, a mechanical property, an IVN (viscosity index), an ATG (a viscosity index), and the like. The polyamide- Terminal amino group) and CTG (carboxyl end group). Table 1 summarizes the samples.

Amino terminal group content (ATG)

Amino terminal group (ATG) content was measured by potentiometric titration method. 2 grams of polyamide is added to about 70 ml of 90 wt% phenol. The mixture is maintained under stirring and at a temperature of 40 DEG C until the polyamide is completely dissolved. The solution is then titrated with 0.1 N HCl at about 25 ° C. The result is reported as equivalents / tonne (eq / ton). When analyzing fibers and articles, any residue or spin finish must be removed in advance.

Solution viscosity ( IVN )

Measure solution viscosity (IVN) according to ISO 307. The polyamide is dissolved at a concentration of 0.005 g / ml in 90% by weight of formic acid at 25 占 폚, and its flow time is measured. The results are reported as ml / g.

Carboxyl  The terminal group content (CTG)

The carboxyl end group (CTG) content was measured by an appropriate method. 4 grams of polyamide is added to about 80 ml of benzyl alcohol. The mixture is maintained under stirring and at a temperature of 200 DEG C until the polyamide is completely dissolved. The solution is then titrated with 0.1 N potassium hydroxide in ethylene glycol. The result is reported as equivalents / tonne (eq / ton). When analyzing fibers and articles, any residue or spin finish must be removed in advance.

AATCC  195 - Liquid moisture management ability of fabric (horizontal moisture Wicked  Speed and moisture absorption time)

A fabric sample is placed between two horizontal (upper and lower) electrical sensors to evaluate liquid water management properties. Drop a prescribed amount of the test solution on the center of the specimen surface facing upwards to help measure the electrical conductivity change. Allowing the test solution to move freely in three directions (radial diffusion on the upper surface, migration from the upper surface to the lower surface via the specimen, and radial diffusion on the lower surface of the specimen). During the test, the change in electrical resistance of the specimen shall be measured and recorded. Use a moisture management tester (MMT) with this method. The results of moisture absorption (unit: second) and water diffusion rate (mm / sec) are obtained by this method.

AATCC  199 Liquid moisture drying rate

Water (0.1 ml) is applied to the test specimen, which is then placed on the balance and dried for 40 minutes. Continue to monitor the drying rate and record with the Drying Tester software. Record the result as mg of water per minute x surface area (mg / min x in ² ) of the specimen.

Fabric AATCC  197 Vertical Wicked

The time is manually measured and recorded at specific intervals while observing the speed (moving distance per unit time) at which the liquid travels along and / or across the fabric sample in the vertical direction. This test method considers the influence of gravity on the wicking assessment.

Moisture absorption

Approximately 2 grams of sample are placed in a metering bottle and dried at 105 ° C for 2 hours (weight W3). Then, the weighing bottle is placed in an artificial climate chamber (temperature: 20 ° C, RH: 65%) for 24 hours. The weight of the sample is again measured (weight W1). Then, the weighing bottle is placed in an artificial climate chamber (temperature: 30 ° C, RH: 90%) for 24 hours. The weight of the sample is again measured (weight W2). The difference in hygroscopicity is measured by the following equation: MRI = (Wl - W3) / W3, MR2 = (W2 - W3) / W3. The water absorption rate difference is obtained by ∧ MR (%) = MR2 - MRI.

Evaluation by Hand

"HESC Standard of Hand Evaluation - Second Edition", a method developed by the "Hand Evaluation and Standardization Committee" of "The Textile Machinery Society of Japan" , The evaluation of the tactile property was evaluated subjectively. The samples were evaluated by comparing the sensory feel felt on the fingers while touching the samples of the method with the standard reference samples by hand. These properties include stiffness, smoothness, fullness, softness, crispness, and compression. The THV (Total Hand Value) grade is given as 1 to 5, 5 is very good, and 1 is very poor.

Example  A to I - Multi lobe section study

For the melt-spinning process ability, different multi-lobe sections were investigated. Polyamide 6.6 pellets were used in the samples. A polyamide 6.6 pellet was prepared from the polymerization of a nylon salt containing predominantly hexamethylenediamine and adipic acid. IVN (viscosity index), measured according to the method disclosed herein, is 128-132 and ATG (amine end group) is 40-45. A multi-filament yarn was produced. A summary of the samples is shown in Table 2.

EXAMPLES 1 to 8-Flat flat sample

PA 5.6 -Examples 1, 2, 3 and 6

5. Prepare polyamide 5.6 fibers from polyamide 5.6 pellets by melt spinning extrusion using spinnerets containing multiple lobe sections of Examples 2 and 3, or spinnerets containing round holes of Examples 1 and 6 Respectively. The polyamide 5.6 pellets are polyamides commercially available from Cathay Biotech under the tradename Terryl ^® . IVN is 138 to 142, ATG is 38 to 42, and CTG is 65 to 75, measured according to the method disclosed herein.

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 inside a screw extruder (temperature of about 290 ° C and extrusion pressure of about 50 bar). Then, according to step a3, the molten polyamide blend was spun into a multi-filament yarn at a spin pack pressure of about 200 bar and a spin pack flow rate of about 5 kg / h. In step a4, the polyamide fiber blend was solidified and wound onto a bobbin at a speed of about 4200 m / min.

PA 6.6 -Examples 4, 5 and 7

In the same manner as described in Examples 1, 2, 3 and 6, spinning processes including the spinnerets including the multiple lobe section holes of Example 5, or spinning processes using the spinnerets including the round holes of Examples 4 and 7 Polyamide 6.6 fibers were prepared from polyamide 6.6 pellets by spin extrusion.

Polyamide 6.6 pellets were prepared from the polymerization of nylon salts containing predominantly hexamethylenediamine and adipic acid. As measured according to the method disclosed herein, the IVN (viscosity index) is 128 to 132 and the ATG (amine end group) is 40 to 45.

PA 6.10 - Example 8

Polyamide 6.10 fibers were prepared from polyamide 6.10 pellets by melt spin extrusion using spinning processes including round holes, in the same manner as described in Examples 1, 2, 3 and 6 above. Polyamide 6.10, polyamide pellets are sold under the trade name STABAMID ^ⓒ from Solvay Group. IVN is 102 to 118 and ATG is 49 to 57, measured according to the method disclosed herein.

Examples 1.1 to 4.2 - Texture room samples

The resulting multifilament yarns (Samples 1, 2, 4, 5, 6 and 7) were further texturized to a linear density of 1 x 80f68 dtex (Examples 1.1, 2.1, 4.1, 5.1, 6.1 and 7.1). The resultant multifilament yarns (Samples 1 and 4) were further texturized to a linear density of 2 x 80 f68 dtex (Samples 1.2 and 4.2).

In all of the above examples, similar knitted fabrics were made to perform moisture management capability tests. A summary of the specimen details and mechanical results is provided in the following table.

result

1. Workability study of multiple lobe sections

2. Hygroscopicity study of polyamide

3. Flat  Study on moisture management ability of real samples

4. Moisture management ability of texture samples

5. Vertical of fabric Wicked

6. Study of cross-sectional effects on hand touch characteristics

conclusion

First, some cross-sections were examined to select the most favorable workability (Table 2). A multi-lobe arrangement with an angle between lobes of 120 ° showed the best melt spinning performance (Samples A, B, C, D, F). On the other hand, sections with flat or low symmetry showed poor workability (Samples E, G, H). Therefore, samples "A" and "B" were used for the comfort management ability test of the present invention.

Secondly, the hygroscopicity of the three polyamides was analyzed and the polyamide 5.6 showed the best results. In fact, the hygroscopicity was found to be surprisingly high (5.1% sample 1.2 in Table 3).

Next, moisture management characteristics called water absorption, moisture drying, and water wicking were observed on the flat yarn, and the results are summarized in Table 3. In comparison between Sample 2 (invention) and Sample 4 (comparative), the moisture drying rate was increased by 79%, the water uptake was improved by 89%, and the water wicking rate was increased by 26 (or 2600%) . A thread of less and thicker filaments, such as 100f23 (greater dtex per filament), tended to be less comfortable to the skin than yarn 100f68, which was made of more and thinner filaments. However, the results of Samples 6 and 7 (100f23) showed very good moisture management capabilities due to the hygroscopic nature of the polyamide 5.6 (for example, the moisture uptake is 96% greater and the water wicking speed 78 times faster) , It is expected that the addition of the multi-lobe section will further increase. Thus, the wicking characteristics are greatly improved.

By comparison of sample 1 (control) and sample 2 (invention), the modified multi-lob cross section played a significant role in this improvement, with a moisture drying rate of 9%, a moisture uptake of 40%, a water wicking rate of 24% Respectively. The results of polyamide 6.10 (sample 8) are also presented as comparative examples; Very poor results were obtained due to very low hydrophilicity.

The same characteristics were analyzed for the texture room (Table 5). Texture yarns had more wrinkles, textures, volume, stretch and twist; Therefore, it provided better softness, comfort, insulation, and improved skin comfort. The results of Samples 2.1 (invention) and 4.1 (comparative) show a 15% increase in moisture drying rate, a 22% increase in moisture uptake, and a 46% increase in moisture wicking rate. Compared with Samples 1.1 and 2.1, the increase in moisture drying rate by 9%, moisture uptake by 11% and wicking rate by 7%, and the multiple lobe section also contributed to this increase. The results of the yarn with fewer filaments (6.1) and double ply (1.2) showed significant improvement with respect to samples 7.1 and 4.2, respectively. The term 2 x 80f68 combines two chambers during the texturing process; This means that the linear density is twice the linear density of 1 x 80f68.

In addition, to understand the effect of multiple lobe sections, a vertical wicking test with gravity was also performed to further analyze the wicking characteristics, and again by comparing the results of Table 6 (Samples 1 and 2), surprisingly 29% A substantial improvement has been achieved.

Also, from the results in Table 7, it can be concluded that the cross-sectional profile of the present invention improves the feel and softness of the fibers when touched by hand because of the lower bending strength, the preferred bending direction, and lower thread packing density.

Therefore, according to the results, novel polyamides having inherent hygroscopicity and comfort characteristics are disclosed in the present invention, which have a higher water absorption rate than the articles made of non-hygroscopic polyamide with round cross- And drying can be confirmed. In addition, synergism between the cross-section and hygroscopicity with larger surface area and capillary action increases the rate of moisture drying, and as a result, the wearer feels dry and comfortable even after severe sweating. The results are summarized below:

Moisture Drying Rate

PA 5.6 (7 lobes) >>> PA 6.6 0 (flat)

PA 5.6 (7 lobes) >> PA 6.6 0 (texture)

Moisture absorption time

PA 5.6 (7 lobes) >>> PA 6.6 0 (flat)

PA 5.6 (7 lobes) >> PA 6.6 0 (texture)

Water Wicking Rate

PA 5.6 (7 lobes) >>>>> PA 6.6 0 (flat)

PA 5.6 (7 lobes) >> PA 6.6 0 (texture)

The overall advantages of polyamide fibers and articles made therefrom include:

- Optimum hygroscopicity for absorbing sweat without feeling damp and keeping the ideal microclimate insulation.

- Improved wicking speed for efficient transport of sweat out of the skin.

- Fast drying speed, for keeping skin dry and preventing chills after unpleasant exercise.

The mechanical and chemical properties of the polyamide article are not significantly changed.

The present invention uses a simple, conventional and well-known extrusion machine.

The cross-sectional profile of the present invention also improves the hand feel and softness of the fibers due to the novel multi-lobe cross-sectional features disclosed.

Claims (21)

A polyamide fiber having improved comfort management ability, comprising a hygroscopic polyamide which is a bio-based aliphatic polyamide selected from the group consisting of polyamide 5.X (where X is an integer of 4 to 16) and mixtures thereof, Characterized in that it has at least two cooperating centers and at least five identical-sized rectangular lobes, each cooperating center connecting at least three identical-sized rectangular lobes according to the angular symmetry between adjacent equal-sized rectangular lobes. ≪ / RTI > The polyamide fiber according to claim 1, wherein the hygroscopic polyamide is a polyamide 5.X wherein X is an even integer number of 4 to 16, preferably 6 or 10. The polyamide fiber according to claim 1 or 2, wherein the hygroscopic polyamide is a polyamide 5.6. 4. The composition of any one of claims 1 to 3, wherein the fibers comprise more than 75 wt%, preferably more than 85 wt%, more preferably more than 95 wt% hygroscopic polyamide, based on the total weight of the fibers, ≪ / RTI > 5. A method according to any one of claims 1 to 4, wherein the multi-lob cross section has two to six mating centers, each mating center comprising three or four Of the same size rectangular lobes symmetrically. 6. The method according to any one of claims 1 to 5, wherein the multi-lobe section has two to six mating centers, each mating center having three identical-sized rectangular lobes at an angle of 120 [deg.] Between adjacent lobes The polyamide fibers are symmetrically connected. 7. A method according to any one of claims 1 to 6, wherein the multi-lob cross section has two or three cooperating centers, each cooperating center having three identical-sized rectangular lobes at an angle of 120 [deg.] Between adjacent lobes The polyamide fibers are symmetrically connected. A process for the production of polyamide fibers having improved comfort management capabilities as defined in any one of claims 1 to 7, characterized in that the polyamide fibers are of the type defined in any one of claims 1 to 4 Is obtained by melt-spin extrusion of a polyamide composition comprising the same hygroscopic polyamide. The method of claim 8, wherein the melt spin extrusion
a1. Feeding a polyamide composition comprising a hygroscopic polyamide to the inlet of a screw extruder in the form of a melt, pellet or powder,
a2. Melting, homogenizing and pressing the polyamide composition,
a3. Spinning the molten polyamide composition into a fiber,
a4. Cooling and winding the fiber
Lt; / RTI >
Wherein step a3 is achieved through at least one spinneret comprising multiple lobe holes in which each hole has at least two mating centers and at least five identical dimension rectangular lobes which are angularly symmetric between adjacent equal dimension rectangular lobes, Lt; / RTI >
Wherein the fibers are obtained by coalescence, each coalescent center connecting at least three identical-sized rectangular lobes according to angular symmetry between adjacent equal-sized rectangular lobes. 10. The method of claim 9, wherein the multiple lobe apertures have two to six lumen centers, each lumen center symmetrically connecting three or four identical dimension rectangular lobes at an angle of 120 or 90 degrees between adjacent lobes, How to. 10. The method of claim 9, wherein the multiple lobe holes have two to six lumen centers, each lumen center symmetrically connecting three identical dimension rectangular lobes at an angle of 120 [deg.] Between adjacent lobes. 10. The method of claim 9, wherein the multiple lobe holes have two or three lobe centers, each lobe center symmetrically connecting three identical dimension rectangular lobes at an angle of 120 [deg.] Between adjacent lobes. 13. The method according to any one of claims 8 to 12,
b1. Removing the fibers from the package and passing them through a delivery roll,
b2. Passing the fibers through a heater and then sending them to a cooling zone,
b3. Passing the fibers through a spindle comprising a rotating disk (friction aggregates)
b4. Applying an intermingling point and a corning oil to the fibers,
b5. Winding the fiber onto the bobbin
(Here, the drawing ratio is provided to the yarn by changing the speed ratio of step b1 and step b5)
Further comprising a false twist texturing process comprising: A polyamide fiber having improved comfort management capability as defined in any one of claims 1 to 7 or a polyamide fiber obtained from a process as defined in any one of claims 8 to 13 ≪ / RTI > 15. The polyamide article according to claim 14, wherein the polyamide article is a polyamide fiber having improved comfort management capability as defined in any one of claims 1 to 7 or a polyamide fiber as defined in any one of claims 8 to 13 Staple fiber, flock, woven, knitted or non-woven fabric, or fabric article made from polyamide fibers obtained from a process as described above. 16. The method according to claim 14 or 15, wherein the polyamide article has a toughness of 20 to 80 cN / Tex (at break), an elongation at break of 20% to 90%, a linear density of 40 to about 300 dtex, Wherein the dtex per filament is from 0.1 to 5.0. 16. Polyamide article according to claim 14 or 15, wherein the polyamide article is a fabric having a mass per unit area of polyamide fabric less than 200 g / m2, preferably less than 150 g / m2. 18. A polyamide article according to any one of claims 14 to 17, wherein the polyamide article is a part of a fabric article or a textile article and the polyamide article comprises at least 30% by weight, based on the total weight of the article of fabric. article. A process for the production of a polyamide article as defined in any one of claims 14 to 18, characterized in that it comprises a polyamide fiber having improved comfort management ability as defined in any one of claims 1 to 7, A polyamide fiber obtained by a process as defined in any one of claims 8 to 13 which is modified by means of a canning, knitting, weaving, nonwoven processing, clothing making or a combination thereof. Method of obtaining an article. A polyamide fiber as defined in any one of claims 1 to 7 or a polyamide fiber obtained from a process as defined in any one of claims 8 to 13, Use to increase the ability of the article to manage comfort. 21. Use according to claim 20, wherein the polyamide article is a textile article.

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