JP7050424B2 - Method for manufacturing composite fiber, fabric and fiber structure - Google Patents

Description

The present invention relates to a method for producing a composite fiber, a fabric and a fiber structure.

Conventionally, various fibers and composite fibers using a polyether amide block resin have been proposed. These fibers are used for the purpose of imparting cold contact feeling and antistatic property to the fabric by taking advantage of the high hygroscopicity of the polyether amide block resin.
For example, Patent Document 1 describes that an excellent contact cooling sensation can be obtained by using a fiber containing a polyether amide block resin.
Further, Patent Document 2 describes that by using an antistatic fiber structure having fibers made of a polyether amide block resin, an excellent antistatic effect can be obtained without impairing the physical characteristics and texture of the fibers. ..

Japanese Unexamined Patent Publication No. 2004-270075 Japanese Unexamined Patent Publication No. 2007-291558

However, both Patent Document 1 and Patent Document 2 only describe that yarn is produced by a melt spinning method using resin pellets of a polyether amide block resin, and a specific method for fiberization is disclosed. It has not been. In fact, when the polyether amide block resin is melt-spun alone, the obtained fibers easily become stuck, so that the fibers are unraveled from the clerill during warping and knitting of the woven fabric. It could not be smoothly used, and it could not be industrially used as a fiber for cloth used for clothing and the like.

Therefore, the present invention solves the above-mentioned problems and obtains a fiber for industrial use, which is substantially composed of a polyether amide block resin alone, as a fiber for a cloth used for clothing or the like. The purpose.

（式中、ＰＡはポリアミド単位（ハードセグメント）、ＰＥはポリエーテル単位（ソフトセグメント）、ｎは繰り返し単位を示す。) In order to achieve the above object, the first gist of the present invention is a composite fiber containing a polyether block amide copolymer resin represented by the formula (1) as a core component and a hot water soluble resin as a sheath component.

(In the formula, PA is a polyamide unit (hard segment), PE is a polyether unit (soft segment), and n is a repeating unit.)

Further, the hot water-soluble resin is a copolymerized polyester composed of an acid component mainly composed of terephthalic acid and a diol component mainly composed of ethylene glycol, and 8 to 15 mol% of the acid component is a sodium sulfoisophthalate derivative and the acid component. The second gist is the composite fiber in which 10 to 40 mol% of the above is isophthalic acid or a derivative thereof and 8 to 25 mol% of the diol component is diethylene glycol.

Further, the above-mentioned composite fiber in which the hot water-soluble resin is a copolymer resin of ethylene and vinyl alcohol is the third gist.

The fourth gist is that the fabric contains at least 20% by mass of the composite fiber.

A method for producing a fiber structure containing a single yarn of a polyether blockamide copolymer resin, which comprises treating a fabric containing the composite fiber with water at 60 ° C. or higher to dissolve and remove a hot water-soluble resin. It is the gist of the five.

According to the composite fiber of the present invention, it can be unraveled at the time of knitting and weaving without sticking. Therefore, by removing the hot water-soluble resin in the subsequent step, a fiber structure containing substantially a single yarn of a polyether amide block resin can be obtained. Can be manufactured industrially.

Further, the fiber structure obtained by treating the fabric containing the composite fiber of the present invention with hot water and the garment containing the fiber structure have excellent contact cooling sensation and antistatic property.

FIG. 1 is an example of a cross section of a composite fiber of the present invention. FIG. 2 is an example of the cross section of the composite fiber of the present invention.

Hereinafter, the present invention will be described in detail.

The present invention is a composite fiber containing a polyether block amide copolymer resin as a core component and a hot water soluble resin as a sheath component.

First, the polyether block amide copolymer resin in the present invention is a copolymer obtained by polycondensation of a polyamide unit having a dicarboxylic acid terminal and a polyether diol unit, and is represented by the following formula 1.

（式中、ＰＡはポリアミド単位（ハードセグメント）、ＰＥはポリエーテル単位（ソフトセグメント）、ｎは繰り返し単位を示す。)

(In the formula, PA is a polyamide unit (hard segment), PE is a polyether unit (soft segment), and n is a repeating unit.)

As the polyamide unit, polyamide 6, polyamide 6, 6, polyamide 12, and the like are preferably used.

As the polyether unit, poethylene glycol, polytetramethylene glycol and the like are preferably used.

The mass ratio of the "polyamide unit" and the "polyether unit" is preferably 99: 1 to 5:95, more preferably 80:20 to 10:90, and can be effectively used within this range. ..

Examples of commercially available products include Arkema's Pevacs (Pebax (registered trademark)), and among them, Pevacs (Pebax (registered trademark)) MV1074 (trade name) and MH1657 (trade name) are particularly used. Good antistatic properties can be obtained.

The polyether block amide copolymer resin is generally known as a resin having strong impact resistance, and is used for soles and the like for sports applications. Its chemical resistance is resistant to alcohols and general organic solvents, but weak to strong acids and alkalis, for example, it dissolves in concentrated sulfuric acid or an aqueous solution of sodium hydroxide.

Next, examples of the hot water-soluble resin preferably include a copolymerized polyester resin and an ethylene-vinyl alcohol copolymerized resin.

In the present invention, the hot water-soluble resin is a resin that dissolves in hot water, preferably a resin that dissolves in water at 80 ° C. or higher, and more preferably a resin that dissolves in water at 60 ° C. or higher.

The copolymerized polyester resin in the present invention comprises an acid component mainly composed of terephthalic acid and a diol component mainly composed of ethylene glycol.

The acid component of the copolymerized polyester resin in the present invention is 8 to 15 mol% of a sodium sulfoisophthalate derivative. More preferably, it is 9 to 12 mol%.
When the ratio of the sodium sulfoisophthalate derivative as an acid component is less than 8 mol%, the solubility in hot water tends to decrease. If it exceeds 15 mol%, the reactivity is lowered and the degree of polymerization is not increased, the resin strength is remarkably lowered, and it may be difficult to use it as a fiber.

The acid component of the copolymerized polyester resin in the present invention is isophthalic acid or an isophthalic acid derivative in an amount of 10 to 40 mol%. More preferably, it is 20 to 35 mol%.

The diol component of the copolymerized polyester resin in the present invention is 8 to 25 mol% of diethylene glycol. More preferably, it is 15 to 22 mol%. If the ratio of diethylene glycol is less than 8 mol%, the solubility in hot water tends to decrease, and if it exceeds 25 mol%, the impact strength is significantly reduced and the color is colored yellow, which may be difficult to use as a fiber.

The copolymerized polyester resin in the present invention may be further copolymerized with other components as long as the object of the present invention is not impaired. Specific examples of the copolymerization component include components such as naphthalenedicarboxylic acid, 4,4-diphenyldicarboxylic acid, adipic acid, sebacic acid and ester-forming derivatives thereof as the dicarboxylic acid component. Examples of the diol component include hexamethylene glycol, neopentyl glycol, cyclohexanedimethanol, bisphenol A and the like. Further, polyoxyalkylene glycols such as polyethylene glycol and polypropylene glycol can also be mentioned. The copolymerization amount of these copolymerization components is preferably 10 mol% or less, more preferably 5 mol% or less, per constituent repeating unit.

As a method for producing a copolymerized polyester in the present invention, an esterification or transesterification reaction was carried out according to a conventional method using the above-mentioned dicarboxylic acid or an ester-forming derivative thereof as a main starting material and a diol or an ester-forming derivative thereof. After that, a method of producing by further performing a transesterification reaction at a high temperature and a reduced pressure can be mentioned.
Further, as the polymerization catalyst, an antimony catalyst typified by antimony trioxide, a germanium catalyst typified by germanium oxide, an aluminum catalyst or a titanium catalyst, which are generally used for polyester polymerization, may be used. can.

The viscosity of the copolymerized polyester resin in the present invention is not particularly limited, and polyester having an intrinsic viscosity (hereinafter referred to as IV) used for ordinary polyester fibers can be used. From the viewpoint of polymerizable property, spinnability and mechanical strength of the fiber, IV of 0.30 to 0.63 can be preferably used. More preferably, the IV is 0.33 to 0.45.

To the extent that the object of the present invention is not impaired, a small amount of other polymers, antioxidants, heat stabilizers, matting agents, pigments, dyes, ultraviolet absorbers, and fluorescence increase can be contained in this copolymerized polyester resin. It may contain whitening agents, plasticizers or other additives.

The water content of the copolymerized polyester resin in the present invention is preferably less than 50 ppm. As a method for drying the resin, a method using a static vacuum dryer or a vacuum dryer with a stirring blade is preferable. Since the copolymerized polyester resin in the present invention is amorphous and has a glass transition temperature (Tg) of about 60 to 70 ° C., the resin should be dried in a static vacuum dryer at about 60 ° C. for several days. It is preferably less than 50 ppm over a long period of time (for example, 1 to 7 days). In a vacuum dryer with a stirring blade (for example, Nauter Mixer (trade name) manufactured by Hosokawa Micron Co., Ltd.), the temperature is 80 to 100 ° C. for 12 to 24 hours while stirring is continued, and the temperature becomes 55 ° C or lower while stirring is continued. By forcibly cooling to, it can be dried to a moisture content of 50 ppm.

The ethylene-vinyl alcohol copolymer resin used for the hot water soluble resin in the present invention will be described.

The ethylene-vinyl alcohol copolymer resin is a resin obtained by further saponifying an ethylene-vinyl acetate copolymer obtained by polymerizing ethylene and vinyl acetate, and is represented by the following formula (2).

（式中、ｌ、ｍ、ｎは繰り返し単位を示す。）

(In the formula, l, m, and n indicate repeating units.)

Here, the ethylene content represented by the following formula (3) is preferably 1 to 45 mol%, more preferably 4 to 40 mol%. If the ethylene content is less than 1 mol%, even if it is thermally melted, it tends to be mottled and the formability tends to deteriorate. If it exceeds 45 mol%, the water solubility is lowered, and there is a tendency that undissolved residue is generated even in hot water. If the ethylene content is 15 mol% or less, it dissolves in water at room temperature, but if the content is higher than that, it dissolves in boiling water from 60 ° C.

（式中、ｌ、ｍ、ｎは繰り返し単位を示す。)

(In the formula, l, m, and n indicate repeating units.)

The saponification degree represented by the following formula (4) is preferably 90 to 99.7 mol%, and if it exceeds 99.7 mol%, the water solubility tends to decrease, and stable production may be difficult. There is. Further, when the saponification degree is less than 90 mol%, the thermal stability is poor and there is a possibility that satisfactory spinning cannot be achieved due to thermal decomposition or gel generation. Therefore, the more preferable saponification degree is 95 to 99.5 mol%.

The ratio of ethylene, vinyl alcohol and vinyl acetate can be measured using a nuclear magnetic resonance spectrum (NMR).

As for the ethylene-vinyl alcohol copolymer resin, a commercially available resin may be used as it is. Specifically, select from various grades of "Soanol (registered trademark)" manufactured by Nippon Synthetic Chemistry Co., Ltd., "Eval (registered trademark)" and "Exevar (registered trademark)" manufactured by Kuraray Co., Ltd. as appropriate. be able to.

Next, FIGS. 1 and 2 are exemplified as preferable cross-sectional shapes of the composite fiber of the present invention. FIG. 1 is a core-sheath-shaped composite fiber containing a polyether blockamide copolymer resin as one core component and a hot water-soluble resin as a sheath component. This cross section is in the shape of a double circle in which one core component is completely surrounded by a sheath component. FIG. 2 is a sea-island type shape in which a plurality of island components in which two or more core components are arranged and a sheath component includes a plurality of island components.
Further, the outer shape of the core component in the core-sheath shape and the island component in the sea-island shape is not particularly limited, but may be a simple round shape, a triangle shape, a C shape, a star shape, or the like. There may be. The outer peripheral shape of the composite fiber is not particularly limited, and may be a polygonal shape such as a circle, a triangle, or a quadrangle.

The number of fibers constituting the composite fiber may be a so-called monofilament composed of one fiber or a so-called multifilament composed of a plurality of fibers.

Further, the mass ratio (core-sheath ratio, sea-island ratio) of the core component and the sheath component in the composite fiber of the present invention is not particularly limited, but when used as a woven fabric such as a cloth or clothing, the sheath is made of hot water. The core (island) / sheath (sea) is 25 / The range of 75 to 90/10 is preferable, the core (island) / sheath (sea) is in the range of 50/50 to 85/15, and the core (island) / sheath (sea) is particularly preferable. , 70/30 to 80/20.

Furthermore, in the case of the sea-island shape, the number of islands is as follows: 3 islands and 4 islands on a single circle, 5 islands and 7 islands on a double circle, and 19 on a triple circle. Islands, 37 islands, 61 islands arranged in a quadruple circle, etc. are preferable because they are easy to spin in a well-balanced manner.

The fabric containing the composite fiber of the present invention may be any form of fabric such as a woven fabric, a knitted fabric, and a non-woven fabric.

It is preferable to use at least 20% by mass of the composite fiber of the present invention in the fabric containing the composite fiber of the present invention from the viewpoint of easily obtaining cold contact sensitivity and antistatic property. More preferably, it is 25% by mass or more.

The fabric containing the composite fiber of the present invention can substantially produce a fiber structure containing a single yarn of a polyether block amide copolymer resin by dissolving and removing the hot water-soluble resin.

The fiber structure containing the obtained substantially polyether block amide copolymer resin single yarn can be suitably used for clothing. Clothing containing such a fiber structure is excellent in contact cold sensitivity and antistatic property.

Next, suitable examples of the composite fiber of the present invention, the fabric containing the composite fiber of the present invention, and the method for producing clothing will be described.
As a method for producing a composite fiber of the present invention, for example, the resin constituting the core component and the resin constituting the sheath component are heated and melted by separate extruders, and then metered and extruded by a gear pump to meet in a desired shape inside the nozzle. A general melt composite extrusion method, in which the fibers are extruded to obtain a fiber shape and then wound into fibers, can be applied.

As a method for producing a fabric, for example, a woven fabric may be produced by weaving and weaving as warp and weft warped using a loom, or a knitted fabric may be produced by knitting using a circular knitting machine or the like. .. It is preferable to use the composite fiber of the present invention in an amount of 20% by mass or more of the fiber in order to obtain cold contact feeling and antistatic property as the cloth. More preferably, it is 25% by mass or more.

Further, the fabric may be produced by melting the core component and the sheath component, extruding the melted resin in the shape of the core sheath, and using a spunlace method or a spunbond method as a non-woven fabric.

The composite fiber of the present invention can be easily used as a cloth for woven fabrics, knitted fabrics, non-woven fabrics, etc. Can be manufactured.

The fabric containing the composite fiber of the present invention can substantially produce a fiber structure containing a single yarn of a polyether block amide copolymer resin by dissolving and removing the thermoplastic resin.

As a method for dissolving and removing the hot water-soluble resin in the fabric containing the composite fiber of the present invention, for example, it is preferably dissolved and removed by submerging it in water having a temperature of 60 ° C. or higher in the pre-stage of the fabric scouring step. can do. Here, dissolution can be efficiently performed by adding a water stream or mechanical kneading in water. Further, as a step before dyeing with a liquid flow dyeing machine, the hot water soluble resin may be dissolved and removed by adding a liquid flow in a state of being filled with only water. In the present invention, the temperature of water for dissolving and removing the hot water-soluble resin is preferably 60 ° C. or higher, more preferably 80 ° C. or higher.

By using the fiber structure thus obtained substantially containing a single yarn of a polyether block amide copolymer resin for clothing, it is possible to obtain clothing having excellent contact cooling sensation and antistatic property.

Hereinafter, the present invention will be specifically described with reference to examples. The present invention is not limited to the examples described below. The prototype method, measurement method, and evaluation method in Examples and Comparative Examples are as follows.

[Making polyester resin]
The diol component was charged into a stainless steel autoclave at the copolymerization ratio shown in Table 1 so that the mol ratio of the glycol component to the acid component was 1.2, and the esterification reaction was carried out under the conditions of 250 ° C. and 200 kPa. rice field. After completion of the esterification reaction, a predetermined amount of antimony trioxide catalyst and trimethyl phosphate were added, and a depolymerization reaction was carried out at 280 ° C. under a reduced pressure of 66 Pa to obtain a copolymerized polyester resin having the composition shown in Table 1. The obtained copolymerized polyester resin was discharged from the bottom nozzle of the stainless autoclave into a water tank under nitrogen pressure to be cooled and solidified, and this was pelletized with a pelletizer. Here, for those with particularly high solubility in hot water (those that dissolve even in water at room temperature), the copolymerized polyester resin is discharged onto a metal mesh on a strand conveyor and solidified by applying cold air to form a cord. It was pelletized with a pelletizer.

[Evaluation of hot water solubility of polyester resin]
Regarding the various resin pellets in Table 1, those dissolved in water at 60 ° C. were marked with ⊚, those dissolved in water at 80 ° C. were marked with ◯, and those not dissolved in water at 80 ° C. were marked with x.

[Cylinder knitted fabric manufacturing method]
Using the test tube knitting machine NCR-EW (kettle diameter: 3 inches and a half, 24 gauge) manufactured by Eiko Sangyo, the composite fiber is made of two twin yarns, the number of wales is 30 / 25.4 mm, and the number of courses is 60. A tubular knitted fabric was prepared by knitting to a size of / 25.4 mm.

[Evaluation of hot water solubility of composite fibers]
The prepared tubular knitted fabric was placed in water at 80 ° C. (ion-exchanged water, 1:20), stirred, treated for 10 minutes, taken out, further washed with water, dehydrated, and air-dried. The mass of the tubular knitted fabric before and after the treatment was weighed, and the mass weight loss rate was obtained. With respect to the mass of the sheath component (sea component) calculated from the composition of the composite fiber used for the tubular knitted fabric, those with a mass loss rate of 95% or more were evaluated as ◯, and those with a mass loss rate of less than 95% were evaluated as ×. ..

[Evaluation of cool contact feeling]
The prepared tubular knitted fabric was placed in water at 80 ° C. (ion-exchanged water, 1:20), stirred, treated for 10 minutes, taken out, further washed with water, dehydrated, and air-dried. The tubular knitted fabrics before and after the treatment were grasped with the left and right hands, respectively, and those judged to have a difference in cold sensation were evaluated as ◯, and those judged to have no difference were evaluated as x.

[Example 1]
Using the resin A-1 shown in Table 1 as a sheath component and Arkema's Pevacs (registered trademark) MH1657 (trade name) as a core component, adjust the core / sheath ratio to 3/1 (mass ratio). It was melt-spun at 270 ° C. to obtain a composite fiber of 110 dtex / 24 f. A tubular knitted fabric was produced using the obtained composite fiber.

[Example 2]
The cross-sectional shape of the fiber is a sea-island shape with 19 island components, resin B-1 shown in Table 1 is the sea component, Arkema Pevacs (registered trademark) MH1657 (trade name) is the island component, and the sea / island ratio. Composite fibers were obtained in the same manner as in Example 1 except that the value was 4/6 (mass ratio). A tubular knitted fabric was produced using the obtained composite fiber.

[Example 3]
The cross-sectional shape of the fiber is a sea-island shape with 19 island components, resin B-2 shown in Table 1 is the sea component, Arkema Pevacs (registered trademark) MH1657 (trade name) is the island component, and the sea / island ratio. Composite fibers were obtained in the same manner as in Example 1 except that the value was 4/6 (mass ratio). A tubular knitted fabric was produced using the obtained composite fiber.

[Example 4]
The fiber cross-sectional shape is the same as in Example 2 except that the fiber cross-sectional shape is a sea-island shape having 37 island components, the resin C-1 shown in Table 1 is a sea component, and the sea / island ratio is 5/5 (mass ratio). Obtained a composite fiber. A tubular knitted fabric was produced using the obtained composite fiber.

[Example 5]
The fiber cross-sectional shape is the same as in Example 2 except that the fiber cross-sectional shape is a sea-island shape having 37 island components, the resin C-2 shown in Table 1 is a sea component, and the sea / island ratio is 5/5 (mass ratio). Obtained a composite fiber. A tubular knitted fabric was produced using the obtained composite fiber.

[Example 6]
Soanol (registered trademark) E3808 (trademark) manufactured by Nippon Synthetic Chemical Co., Ltd. with 38 mol% ethylene content and 98% saponification degree is the sheath component, Pevacs (registered trademark) MV1074 (trademark) manufactured by Arkema is the core component, and the spinning temperature. Composite fibers were obtained in the same manner as in Example 1 except that the temperature was set to 220 ° C. A tubular knitted fabric was produced using the obtained composite fiber.

[Example 7]
Kuraray's Exevar (registered trademark) RS-4104 (trademark) with 6 mol% ethylene content and 98.5% saponification is used as the sheath component, and Arkema's Pevacs (registered trademark) MV1074 (trademark) is used as the core component. Composite fibers were obtained in the same manner as in Example 2 except that the core / sheath ratio was 3/1 (mass ratio) and the spinning temperature was 240 ° C. A tubular knitted fabric was produced using the obtained composite fiber.

[Comparative Example 1]
Composite fibers were obtained in the same manner as in Example 1 except that the resin D having the composition shown in Table 1 had a sheath component, a core / sheath ratio of 3/1 (mass ratio), and a spinning temperature of 290 ° C. A tubular knitted fabric was produced using the obtained composite fiber.

[Comparative Example 2]
Composite fibers were obtained in the same manner as in Example 1 except that the resin E having the composition shown in Table 1 was used as a sheath component. A tubular knitted fabric was produced using the obtained composite fiber.

Fiber cross-sectional shape of Examples and Comparative Examples, sheath (sea) component resin, sheath (sea) component mass ratio, core (island) component resin, island component mass ratio, fineness, hot water solubility evaluation, and contact cold sensitivity. The evaluation is shown in Table 2. In the table, E3808 is Soanol (registered trademark) E3808 (trademark) manufactured by Nippon Synthetic Chemical Co., Ltd., RS-4104 is Exevar (registered trademark) RS-4104 (trademark) manufactured by Kuraray, and MH1657 (trademark) is. Alchema Pevacs (registered trademark) MH1657 (trade name) and MV1657 (trade name) indicate Alchema Pevacs (registered trademark) MV1657 (trade name).

The tubular knitted fabrics made from the composite fibers obtained from Examples 1 to 7 are soluble in hot water, and the tubular knitted fabrics after the hot water treatment are substantially composed of fibers of the polyether block copolymer resin alone. It was excellent in cool contact feeling and antistatic property.
The tubular knitted fabric made from the composite fiber obtained from Comparative Example 1 did not lose weight at all and did not have a cold contact feeling at the time of evaluation of solubility in hot water.
The tubular knitted fabric obtained from the composite fiber obtained from Comparative Example 2 did not lose weight at all during the hot water solubility evaluation. Then, the tube knitted fabric was weight-reduced at 90 ° C. for 30 minutes using 2% sodium hydroxide aqueous solution instead of hot water at 80 ° C., and all of them including the core component were dissolved. The obtained tubular knitted fabric had no cold contact sensitivity.
Further, the composite fibers obtained from Examples 1 to 7 were knitted using 50% by mass, flowed with water at 80 ° C. in a liquid flow dyeing machine, and then the dyed fiber structure was used for a shirt. As a result, even after repeated washing, the contact cooling sensation was excellent and the antistatic property was excellent. Similarly, when a shirt was produced from the composite fibers of Comparative Example 1 and Comparative Example 2, no contact cold sensation was felt. In addition, repeated washing caused static electricity to cling to the skin.

The composite fiber of the present invention can be obtained because a fiber structure containing a single yarn substantially made of a polyether blockamide copolymer resin can be industrially obtained by treating the composite fiber with hot water after making it into a fabric. The resulting fiber structure is excellent in cool contact property and antistatic property, and can be suitably used for clothing applications such as clothing.

1 Hot water soluble resin 2 Polyether block amide copolymer resin

Claims (4)

A polyester block amide copolymer resin having the following formula (1) is used as a core component, a hot water-soluble resin is used as a sheath component, and the hot water-soluble resin mainly contains an acid component mainly containing terephthalic acid and ethylene glycol. It is a copolymerized polyester composed of a diol component, in which 8 to 15 mol% of the acid component is a sodium sulfoisophthalic acid derivative, 10 to 40 mol% of the acid component is isophthalic acid or a derivative thereof, and 8 to 25 of the diol component. A composite fiber characterized in that mol% is diethylene glycol .

(In the formula, PA is a polyamide unit (hard segment), PE is a polyether unit (soft segment), and n is a repeating unit.) The core component is a polyether blockamide copolymer resin having the following formula (1), the hot water soluble resin is a sheath component, and the hot water soluble resin is a copolymer resin of ethylene and vinyl alcohol. Composite fiber .

(In the formula, PA is a polyamide unit (hard segment), PE is a polyether unit (soft segment), and n is a repeating unit.) A fabric containing at least 20% by mass of the composite fiber according to claim 1 or 2 . A method for producing a fiber structure containing a single yarn of a polyether blockamide copolymer resin, which comprises treating the fabric according to claim 3 with water at 60 ° C. or higher to dissolve and remove the hot water-soluble resin.

Images