JP2003201674A - Waterproof fabric and method of producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof fabric that never evolves a gas toxic to human bodies from the plastic used on the fabric when the waterproof fabric is discarded and incinerated, and can resist to high water pressure even when the thickness of the coating layer is thin. <P>SOLUTION: A PEE (polyetherester-based elastomer) to be laminated on the ground fabric, PEEA and PEEB having different melting points from each other are used wherein the PEEA layer is directly arranged on the surface of the ground fabric and the PEEB layer is laminated thereon. Both of the PEEA and PEEB include polyalkylene glycol residues of which ≥90 wt.% are polytetramethylene glycol residues, the PEEB melts at ≥130°C, the PEEA melts by more than 20°C lower than the PEEB does. In addition, the thickness of the PEEA layer and that of the PEEB layer totals within 5-50 μm and the proportion of the PEEA layer is within 5-60 wt.% based on the whole thickness of the coating layers. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a waterproof fabric.
More specifically, the present invention relates to a waterproof fabric having a high water pressure resistance, which is suitable as a fabric for tents and has a coating layer formed of a thermoplastic polyether-ester elastomer on the surface of a base fabric.

[0002]

2. Description of the Related Art Conventionally, fabrics for tents have been required to have a function (waterproofness) of preventing rain from entering the tents. In general, it is difficult to obtain satisfactory waterproofness only by the fiber structure of the base fabric, therefore, on one surface of the base fabric made of a fiber material, a method of laminating a film made of polytetrafluoroethylene or a polyurethane elastomer, or Methods such as coating with polyurethane-based elastomers have been adopted.

However, the tent cloth thus obtained has an environmental problem such that the resin used generates a gas that is toxic to the human body when it is discarded and burned. .

On the other hand, for example, Japanese Patent Laid-Open No. 2000-290878.
Polyether-ester based elastomers containing a large amount of polyethylene glycol (PE
It has been proposed to coat the surface of the base fabric with E).

However, when such a waterproof cloth is discarded and burned, it does not generate a gas that is toxic to the human body, but the thickness of the coating layer is reduced in order to reduce the weight of the cloth. Since PEE containing a large amount of polyethylene glycol has insufficient film strength as a thin film, high water pressure resistance cannot be obtained, and it is not suitable for applications such as tent cloth.

For this reason, when discarded and burned, the resin used does not generate a gas that is toxic to the human body, and a high water pressure resistance can be obtained even if the coating layer is thin. Proposals for waterproof fabrics have been earnestly desired.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. The problem is that the resin used when it is discarded and burned is harmful to the human body. It is an object of the present invention to provide a waterproof fabric suitable for a tent fabric, which does not generate a toxic gas and has a high water pressure resistance even when the coating layer is thin, and a method for producing the same.

[0008]

Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventor has found that at least one surface of a base fabric made of a fiber material has a polyether-ester system having a predetermined composition and physical properties. 2 elastomers (PEE)
It was found that a waterproof fabric having a high water pressure resistance can be obtained by coating with a layered structure, and the present invention has been completed.

Thus, according to the present invention, "polyalkylene glycol residue (PAG), alkylene glycol residue (A
G) and a polyether-ester elastomer (PEE) composed of a dicarboxylic acid residue (DC), which is a waterproof cloth, wherein the covering layer has a two-layer structure and is in contact with the base cloth. PEE (PEEA) to be formed and PEE (PEEB) to form the layer on the outside air side are (a) to
A waterproof fabric which simultaneously satisfies the requirement (e). (A) In PEEA and PEEB, both PAGs contain 90% by weight or more of polytetramethylene glycol residues. (B) The melting point of PEEB is 130 ° C. or higher. (C) The melting point of PEEA is lower than the melting point of PEEB by 20 ° C. or more. (D) The total thickness of the layer made of PEEA and the layer made of PEEB is in the range of 5 to 50 μm. (E) The ratio of PEEA in the total coating layer is 5 to 60.
Must be in the weight% range. In addition, "For organic solvents, P
A solution in which a polyether-ester elastomer (PEEA) composed of AG, AG and DC is dissolved in an amount of 2 to 30% by weight with respect to the weight of the organic solvent is prepared, and the solution is prepared by using at least a base material composed of a fiber material. 0.5 to 1 surface
After coating with an amount of 20 g / m ² , the step of forming a layer made of PEEA on the surface of the base fabric by removing the organic solvent, and a polyether-ester type elastomer made of PAG, AG and DC in the organic solvent. A solution in which (PEEB) is dissolved in an amount of 2 to 30% by weight based on the weight of the organic solvent is prepared, and the solution is placed on the layer made of PEEA in an amount of 5 to 30%.
A method for producing a waterproof fabric, comprising the step of laminating a layer made of PEEB on a layer made of PEEA by removing an organic solvent after coating with an amount of g / m ² . Is provided. In order to obtain high peel strength, it is preferable to form a layer made of PEEA and a layer made of PEEB on at least one surface of the base fabric in the method for producing the waterproof fabric and then heat-dissolving only the layer made of PEEA. preferable.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. First, the fiber material constituting the base fabric used in the present invention is not particularly limited, and natural fibers such as cotton, silk and hemp, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, and polyethylene terephthalate. Polyester fiber, polyether fiber, acrylic fiber, nylon fiber, aramid fiber, polybenzimidazole fiber, polytetrafluoroethylene fiber, polybenzoxazole fiber, carbon fiber, phenol fiber, polyvinyl fiber, etc. The synthetic fibers of These fibers may be one kind or a combination of plural kinds. Depending on the type of fiber material used, it is possible to add functions such as high strength, abrasion resistance, flame retardancy, easy recyclability and biodegradability to the waterproof fabric of the present invention.

These fibers are long fibers or short fibers, or
It is used as a yarn such as a processed yarn or a spun yarn of the composite fiber, and is used in the form of a base fabric such as a woven or knitted fabric or a non-woven fabric which is a known fiber aggregate using these yarns. Further, two or more kinds of these base cloths may be stuck together to form a multilayer base cloth.

The single fineness of the fibers constituting these base fabrics is not particularly limited, but those in the range of 0.5 to 5.0 decitex are preferable in view of handling when processing the base fabric.

It is also preferable that these base fabrics are subjected to a water repellent treatment. As the water repellent agent, any conventional one such as a paraffin water repellent agent, a polysiloxane water repellent agent, and a fluorine water repellent agent can be used, and the treatment method is also a padding method, a spray method, or the like. Can be adopted. The process of such water repellent treatment uses PEEA or PEEB for the base cloth.
Either before or after the step of coating with
It is preferable to perform water repellent treatment before coating with A. The amount of the treating agent added is 0.1 to 2% with respect to the weight of the base fabric.
A range of 0% by weight is suitable.

Next, in the waterproof cloth of the present invention, a poly-alkylene glycol residue (PAG), an alkylene glycol residue (AG) and a dicarboxylic acid residue (DC) are formed on at least one surface of the base cloth. Ether
An ester elastomer (PEE) is coated. Here, at least one surface of the base cloth means all one side surface or all side surfaces or all one side surface and a part of the other side surface of the base cloth.

The coating layer has a two-layer structure.
Among the layers, PEE (PEEA) forming a layer in contact with the base cloth (hereinafter referred to as PEEA layer) and a layer on the outside air side (hereinafter referred to as PEE)
The PEE (PEEB) forming the B layer) must have the following features.

First, the melting point of PEEB must be 130 ° C. or higher (preferably 140 to 170 ° C.). When the melting point is less than 130 ° C., for example, when the waterproof cloth of the present invention is used as a tent cloth, the covered surfaces may be heat-sealed when the tent cloth is folded and stored at a high temperature such as in a car in midsummer. Is not preferred. Also, PEE
The melting point of A needs to be lower than the melting point of PEEB by 20 ° C. or more (preferably 30 to 60 ° C.). When the temperature difference between the melting points is less than 20 ° C., the following problems occur, which is not preferable. That is, after covering the base fabric with the PEEA layer, and further covering the PEEB layer with the PEEA layer, P using a heat calendar or the like.
When only the EEA layer is heat-melted to further strengthen the adhesiveness between the coating layer and the base fabric, not only the PEEA layer but also the PEE
The B layer is also dissolved, and high peel strength cannot be obtained, which is not preferable. The melting point of PEEA is 50 to 130 ° C.
The range of (more preferably 70 to 110 ° C.) is suitable from the viewpoint of workability.

The thickness of all coating layers, ie the sum of the PEEA layer thickness and the PEEB layer thickness, must be in the range of 5 to 50 μm (preferably 7 to 40 μm). If the thickness of the entire coating layer is smaller than 5 μm, sufficient water resistance cannot be obtained, which is not preferable. On the contrary, if the thickness is larger than 50 μm, the texture and the lightness of the waterproof fabric are impaired, which is not preferable. The thickness of the coating layer here means
This is the thickness of the coating layer formed on the surface of the base cloth, and does not include the thickness of PEEA that has penetrated into the inside of the base cloth.

Furthermore, the proportion of PEEA in the total coating layer must be in the range of 5 to 60% by weight (preferably 7 to 50% by weight). When the proportion of such PEEA is lower than 5% by weight, sufficient film forming property cannot be obtained, which is not preferable. On the contrary, if the proportion of PEEA is more than 60% by weight, the heat resistance of the coating layer is poor, which is not preferable. By setting the ratio of PEEA in all the coating layers within the above range, excellent adhesion and heat resistance of the coating layer to the base fabric are easily obtained. The ratio of PEEA referred to here includes the amount that has penetrated into the inside of the base cloth.

Next, requirements common to PEEA and PEEB will be described below. First, PEEA and PEEB
In PAG, both polytetramethylene glycol residues are 90% by weight or more (preferably 95% by weight or more)
Must be included. When the content of the polytetramethylene glycol residue is less than 90% by weight, stable and strong film strength cannot be obtained, so that pinholes are likely to occur and high water pressure resistance cannot be obtained, which is not preferable. In addition, PEE on the surface of the base cloth
When coating A, PEEA itself tends to excessively penetrate into the inside of the base fabric, which is not preferable.

PAGs that make up PEEA and PEEB
As long as the above requirements are satisfied, a polyethylene glycol residue, a poly (1,2-propylene glycol residue), a poly (1,3-propylene glycol residue), or a residue of a copolymer of ethylene oxide and propylene oxide. A part of the residue of a copolymer of ethylene oxide and tetrahydrofuran may be arranged. The number average molecular weight of the PAG is preferably in the range of 600 to 8000 (more preferably 1000 to 5000). If the number average molecular weight is less than 600, sufficient mechanical properties may not be obtained. On the other hand, when the number average molecular weight exceeds 8000, phase separation is likely to occur and it may be difficult to adjust PEE.

As DC constituting PEEA and PEEB, terephthalic acid residue, isophthalic acid residue, phthalic acid residue, naphthalene-2,6-dicarboxylic acid residue, naphthalene-2,7-dicarboxylic acid residue, Diphenyl-4,
4 ^, -dicarboxylic acid residue, diphenoxyethanedicarboxylic acid residue, aromatic dicarboxylic acid residue such as sodium 3-sulfoisophthalate, alicyclic dicarboxylic acid residue such as 1,4-cyclohexanedicarboxylic acid residue, Succinic acid residue,
At least one selected from the group consisting of aliphatic dicarboxylic acid residues such as oxalic acid residue, adipic acid residue, sebacic acid residue, dodecanedioic acid residue, dimer acid residue, and derivative residues thereof. Of these, at least one selected from the group consisting of a terephthalic acid residue, an isophthalic acid residue, a naphthalene-2,6-dicarboxylic acid residue, and a derivative residue thereof is particularly preferred. Of course, some of these DCs (usually 30 mol% based on total DC
The following) may be replaced with other DC or oxycarboxylic acid residue.

Examples of AG constituting PEEA and PEEB include ethylene glycol residue, propylene glycol residue, tetramethylene glycol residue and the like.

Furthermore, in PEEA and PEEB, the weight ratio of PAG to AG and DC (PAG: (A
G + DC)) are both in the range of 30:70 to 70:30 (more preferably 40:60 to 60:40). If the weight of PAG is higher than the above range, the melting point of the obtained PEE tends to be low, and if the weight of PAG is lower than the above range, sufficient flexibility may not be exhibited.

The intrinsic viscosity of PEEA and PEEB is appropriately in the range of 0.8 to 1.4 in order to maintain sufficient film forming property and film strength of the coating layer. Also, PEE
Various stabilizers and ultraviolet absorbers may be blended in A and PEEB, if necessary.

In the waterproof fabric of the present invention, the base fabric and PEE
A layer must be directly bonded, but PEEA layer and P layer
An intermediate layer composed of a third PEE having a different polymer composition from the above PEEA and PEEB may be interposed between the EEB layer and a small amount thereof. As the third PEE, one having an intermediate property between PEEA and PEEB is preferable. Moreover, further on the PEEB layer, that is,
On the outer surface side, an outermost surface layer made of another polymer material having a polymer composition different from that of PEEB may also be arranged in a small amount. Other polymer materials having a different polymer composition from PEEB include, for example, a water repellent resin such as a fluororesin, a silicone resin, the above-mentioned third PEE, PEEA, and the like. A water-repellent resin such as a fluororesin or a silicone resin is preferable because it can add a function. The small amount referred to here means 20% by weight or less based on the total weight of all the coating layers.

Next, the method for producing the waterproof fabric of the present invention will be described below. The waterproof fabric of the present invention comprises a step of forming a layer of PEEA on the surface of the base fabric by removing the organic solvent by a dry method or a wet method after coating a solution prepared by dissolving the above PEEA in an organic solvent. And a step of laminating a PEEB layer on the PEEA layer by removing the organic solvent by a dry method or a wet method after coating the solution in which the above-mentioned PEEB is dissolved in the organic solvent. Here, a film made of PEEA and P
The waterproof fabric of the present invention can be obtained by laminating a film made of EEB, but the coating method is preferable in the production process. The base cloth is preferably subjected to a water repellent treatment with a water repellent agent such as a fluorine-based agent as described above, and the amount of the water repellent agent added is
A suitable range is 0.1 to 2.0% by weight based on the weight of the base fabric. Thus, before forming the PEEA layer on the base fabric,
By performing the water repellent treatment in advance, it is possible to prevent the PEEA solution from penetrating into the inside of the base cloth.

Solvents capable of dissolving PEEA and PEEB include dimethylformamide, dioxane,
Examples of the organic solvent include 1,3-dioxolane (ethylene formal), toluene, chloroform, and methylene chloride. Also, PEEA or PE
When EB is dissolved in an organic solvent, it is necessary to dissolve 2 to 30% by weight of PEEA or PEEB with respect to the weight of the organic solvent, and particularly 5 to 20% by weight is uniformly dissolved at a temperature of 50 to 65 ° C. It is preferable for obtaining a uniform coating layer.

As a method for coating the surface of the base cloth,
Any coating method, for example, a coating method using a knife coater or the like is preferably adopted. First, a PEEA coat layer is formed on the surface of the base fabric, and then a PEEB coat layer is formed to form a base fabric. A coating layer having excellent adhesiveness and high water pressure resistance is formed.

The PEEA coat amount is from 0.5 to
20 g / m²(Preferably 1 to 5 g / m²) Range
There is a need. The coating amount of PEEA is 0.5 g / m²Not yet
When it is full, it is difficult to form a uniform thin film.
Since the EB layer also tends to be non-uniform, sufficient water pressure resistance can be obtained.
Not desirable. On the contrary, the coating amount is 20 g / m²Over
If so, the weight of the waterproof fabric increases, which makes it difficult to reduce the weight and is preferable.
Not good. Also, regarding the coating amount of PEEB, 5
~ 30g / m²(Preferably 10 to 20 g / m²) Range
Must be The coating amount of PEEB is 5 g / m²
If it is less than this, sufficient water pressure resistance cannot be obtained, which is not preferable. Reverse
And the coating amount of PEEB is 30 g / m ²Crossing,
The resulting waterproof fabric tends to have a hard texture, which is favorable.
Not good.

For the removal of the organic solvent, 70-1
A method of removing the organic solvent under dry heat at 70 ° C. (preferably 75 to 150 ° C.), or a method in which PEE is insoluble and the organic solvent is soluble, for example, the organic solvent is extracted with warm water, and then dried. A wet method or the like is used.

In the method for producing a waterproof fabric of the present invention, P
After the EEB layer is formed, heat treatment such as thermal calendering is performed, so that the PEEB layer is not thermally melted and PEEA is not melted.
It is preferred to heat dissolve only the layers. By this method, it becomes possible to further strengthen the adhesiveness between the coating layer and the base fabric. At this time, the heat treatment temperature is such that PEEA is melted by heat but PEEB is not melted by heat, and the temperature is 90 to 180 ° C. (more preferably 100 to 1).
A range of 50 ° C is suitable. By calendering the cloth at such a temperature, only the PEEA layer can be heat-dissolved, and strong adhesion between the coating layer and the base cloth can be obtained.

The water repellent treatment may be performed before and / or after heat treatment such as thermal calendaring.

In the waterproof cloth of the present invention thus obtained, the PEEA layer and the PEEB layer are formed with a uniform thickness in the surface direction, and even if it is a thin film, it has a high water pressure resistance. Here, the water pressure resistance is 10 kPa (1020
mmH ₂ O) or more (more preferably 14 kPa or more). Further, as adhesiveness, peel strength is 8 N / 25 mm or more (more preferably 10 N / 25 mm
Or more) is preferable. The waterproof cloth having such high water pressure resistance is suitably used for applications such as cloth for tents.

Although the waterproof cloth of the present invention and the method for producing the same have been described above, the waterproof cloth of the present invention may be used alone or in combination with other cloths.

[0035]

EXAMPLES Examples of the present invention will now be described in detail, but the present invention is not limited thereto. Each measurement item in the examples was measured by the following method. <Melting point> Differential scanning calorimeter (TA instrument
DSC29290 manufactured by T., in a nitrogen stream at 10 ° C.
It was measured at a temperature rising rate of / min. <Tetramethylene glycol content> 90MHz FT
-Quantification was performed using NMR (R1900 manufactured by Hitachi, Ltd.). <Hydraulic pressure resistance test> The test was carried out according to JIS B-1092 method B (high water pressure method) and was measured by the hydrostatic pressure method. <Peeling test> Referring to K-6301, a test piece (2 cm
After heat-bonding the fusion tape to the coated surface of (9 cm), the test piece and the fusion tape are set in the mutually facing chucks (50 mm) of the tensile tester at 50 mm / min.
The distance between the chucks is increased at a pulling speed of 10 to separate the base cloth and the coating layer, and the average stress excluding the initial peeling is read, and the stress per 25 mm width of the sample (N / 25
The value calculated as mm) was defined as the peel strength. <Heat resistance test> Two test pieces of 10 cm x 10 cm were prepared, and the coated surfaces of the test pieces were pasted together to obtain 9.8 N (1 kgf).
Was applied, the mixture was left at 100 ° C. for 6 hours, a peeling test was performed between the coated surfaces of the fusion-bonded portion, and evaluation was made according to the following criteria. ◯: A state where the coated surfaces are not fused at all. Δ: Peel strength (0.98 to 9.8) cN / 25 mm
[(1-10) grf / 25 mm]. X: Peel strength is 9.8 cN / 25 mm [10 grf / 2
5 mm] or more.

Example 1 (Preparation of PEEA) Dimethyl isophthalate (IMT) 3
1.5 parts by weight, tetramethylene glycol (TMG) 1
8.1 parts by weight, polytetramethylene glycol (PTM
G) 32.7 parts by weight was charged into the reaction vessel and a transesterification reaction was carried out to obtain a monomer. Then, the polycondensation reaction was performed while heating and depressurizing to obtain PEEA. In addition, PTMG
Having a number average molecular weight of 1000 was used. Obtained PE
The melting point of EA was 107 ° C. (Production of PEEB) Dimethyl terephthalate (DMT) 2
10 parts, 63.6 parts by weight of isophthalic acid (IA), 193.3 parts by weight of tetramethylene glycol (TMG), and 199 parts by weight of polytetramethylene glycol (PTMG) were charged in a reaction vessel to carry out a transesterification reaction, and a monomer was obtained. Got After that, polycondensation reaction is performed while heating and depressurizing, and P
Obtained EEB. In addition, IA is slurry type, PT
MG having a number average molecular weight of 2000 was used. The melting point of the obtained PEEB was 155 ° C. (Production of waterproof fabric) A water repellent treatment agent (fluorine-based water repellent treatment agent LS-317, manufactured by Meisei Chemical Co., Ltd.) is applied to a polyester fabric.
Is treated to 1.0% by weight with respect to the weight of the base cloth,
A base fabric having a water pressure resistance of 2.94 kPa (300 mmH ₂ O) was prepared. Then, 25 parts by weight of PEEA obtained above was completely dissolved in 75 parts by weight of ethylene formal heated to 60 ° C., and the clearance was adjusted with a knife coater so that the coating amount was 5 g / m ^2. After coating, a PEEA layer was formed by performing heat treatment for 1 minute under dry heat at 120 ° C. Subsequently, 10 parts by weight of PEEB obtained as described above was completely dissolved in 90 parts by weight of ethylene formal heated to 60 ° C., and coated so that the coating amount was 7 g / m ^2.
Heat treatment was performed for 3 minutes under dry heat at 0 ° C. to form a PEEB layer. Furthermore, 120 ° C, 196 N (20 Kgf) / cm
The calendar processing of. The resulting waterproof cloth had a high water pressure resistance, high peel strength, and excellent heat resistance even though the coating layer was a thin film. The evaluation results are shown in Table 1.

[Example 2, Comparative Examples 1 and 2] PEEB
Polytetramethylene glycol (PTM
A waterproof fabric was obtained in the same manner as in Example 1 except that a part of G) was replaced with polyethylene glycol (PEG) and the PTMG / PEG weight ratio was changed as shown in Table 1. Table 1 shows the evaluation results of the obtained waterproof fabric.

[Example 3, Comparative Examples 3 and 4] PEEB
At the time of producing, the melting point of PEEB was changed as shown in Table 1 by appropriately changing the ratio of PTMG and the molecular weight.
Further, the weight ratio of PTMG and PEG was changed as shown in Table 1. A waterproof fabric was obtained in the same manner as in Example 1 except for this. Table 1 shows the evaluation results of the obtained waterproof fabric.

[Comparative Examples 5 to 7] In producing PEEA,
By appropriately changing the ratio of PTMG and the molecular weight, P
The melting point of EEA was changed as shown in Table 1. Also, PEEB
At the time of producing, the melting point of PEEB was changed as shown in Table 1 by appropriately changing the ratio of PTMG and the molecular weight.
Further, the calendering temperature was changed as shown in Table 1.
A waterproof fabric was obtained in the same manner as in Example 1 except for this. Table 1 shows the evaluation results of the obtained waterproof fabric.

[0040]

[Table 1]

[0041]

According to the present invention, a waterproof cloth having a high water pressure resistance can be obtained even if the thickness of the coating layer is thin. When such a waterproof cloth is discarded and burned, the resin used does not generate a gas that is toxic to the human body and is extremely suitable for applications such as tent cloth.

Continued front page    F term (reference) 4F100 AK41B AK41C AK41D AK41E                       AK41J AK42B AK42C AK42D                       AK42E AK42J AK54B AK54C                       AK54D AK54E AK54J AL01B                       AL01C AL01D AL01E AL09B                       AL09C AL09D AL09E BA03                       BA05 BA06 BA07 BA10D                       BA10E DG01A DG11A EH462                       GB87 GB90 JA04B JA04C                       JA04D JA04E JA20B JA20C                       JA20D JA20E JB06 JB07                       JD05 JJ03 JK06 JL00 YY00                       YY00B YY00C YY00D YY00E                 4L033 AA07 AB04 AC03 AC15 CA45                       CA48

Claims (9)

[Claims] 1. A polyether-ester elastomer comprising a polyalkylene glycol residue (PAG), an alkylene glycol residue (AG), and a dicarboxylic acid residue (DC) on at least one surface of a base material made of a fiber material. (PEE) -coated waterproof cloth, wherein the covering layer has a two-layer structure and forms a layer in contact with the base cloth.
EE (PEEA) and PEE (PE that forms a layer on the outside air side)
A waterproof fabric in which EB) simultaneously satisfies the following requirements (a) to (e). (A) In PEEA and PEEB, both PAGs contain 90% by weight or more of polytetramethylene glycol residues. (B) The melting point of PEEB is 130 ° C. or higher. (C) The melting point of PEEA is lower than the melting point of PEEB by 20 ° C. or more. (D) The total thickness of the layer made of PEEA and the layer made of PEEB is in the range of 5 to 50 μm. (E) The ratio of PEEA in the total coating layer is 5 to 60.
Must be in the weight% range. 2. DC in PEEA and PEEB
2. The waterproof fabric according to claim 1, wherein each of them is at least one selected from the group consisting of a terephthalic acid residue, an isophthalic acid residue, a naphthalene-2,6-dicarboxylic acid residue, and a derivative residue thereof. 3. In PEEA and PEEB, PA
The waterproof fabric according to claim 1 or 2, wherein both G number average molecular weights are in the range of 600 to 8000. 4. PA in PEEA and PEEB
Weight ratio of G to AG and DC (PAG: (AG + D
Both C)) are in the range of 30:70 to 70:30, The waterproof cloth according to any one of claims 1 to 3. 5. The water resistant pressure of the waterproof fabric is 10 kPa (10
20 mm H ₂ O) or more in the waterproof fabric according to any one of claims 1 to 4. 6. The peel strength of the waterproof cloth is 8 N / 25 mm.
It is above, The waterproof cloth in any one of Claims 1-5. 7. A polyether-ester elastomer (PEE) comprising PAG, AG and DC in an organic solvent.
A solution is prepared by dissolving A) in an amount of 2 to 30% by weight based on the weight of the organic solvent, and the solution is applied to at least one surface of the base fabric made of a fiber material in an amount of 0.5 to 20 g / m ² . After coating with, the organic solvent is removed to form a layer made of PEEA on the surface of the base cloth, and the organic solvent is treated with PAG, AG.
A polyether-ester type elastomer (PEEB) composed of DC and DC, based on the weight of the organic solvent;
A solution having 0% by weight dissolved therein is prepared, and the solution is mixed with the PEE.
A waterproofing characterized by including a step of laminating a layer made of PEEB on a layer made of PEEA by removing an organic solvent after coating the layer made of A in an amount of 5 to 30 g / m ^2. Fabric manufacturing method. 8. A layer of PEEA and a layer of PEEB are formed on at least one surface of a base fabric, and then PEE is formed.
The method for producing a waterproof cloth according to claim 7, which includes a step of heat-dissolving only the layer consisting of A. 9. The organic solvent is at least one selected from the group consisting of dimethylformaldehyde, dioxane, 1,3-dioxolane, toluene, chloroform, methylene chloride, and mixtures thereof.
The method for producing the waterproof fabric according to.