WO2005007961A1

WO2005007961A1 - Stretch nonwoven fabric, stretch laminate and processes for production of both

Info

Publication number: WO2005007961A1
Application number: PCT/JP2004/009725
Authority: WO
Inventors: Shigeki Tanaka; Masataka Adachi; Hiroyasu Sakaguchi
Original assignee: Toyo Boseki Kabushiki Kaisya
Priority date: 2003-07-18
Filing date: 2004-07-08
Publication date: 2005-01-27
Also published as: JP4217962B2; JP2005036337A

Abstract

The invention provides a stretch nonwoven fabric which is soft and excellent in the contour-following properties and exhibits little tenseness; and a process for the production of a stretch laminate composed of the fabric and an extremely thin stretch film, that is, a stretch nonwoven fabric made of a continuous block copolyester filament fiber which fabric has a fiber diameter of 3 to 30μm and a basis weight of 20 to 200g/m2 and exhibits an elongation at break of 100 % or above, a recovery from 20% elongation of 95% or above, and a stress at 100% elongation at least 1.4 times that at 50% elongation; and a process for the production of a stretch laminate which comprises shrinking a nonwoven fabric made of a block copolyester and having a fiber diameter of 3 to 25μm at 70 to 200°C in at least one direction by 5 to 80% and extrusion-laminating the resulting fabric with a film made of a block copolyester having a melting point of 150 to 230 °C and having a thickness of 5 to 50μm.

Description

Specification

Stretchable nonwoven fabric, stretchable laminate, and methods for producing them

Technical field

The present invention relates to a nonwoven fabric having excellent stretchability and stretch recovery properties. Further, the present invention relates to a waterproof and moisture-permeable thin and lightweight nonwoven laminate, and more particularly, to a nonwoven and nonwoven laminate comprising only a polyester resin composition having excellent mechanical properties and good recyclability. It is about the body. Further, the nonwoven fabric composite of the present invention can be used for clothing, medical use, general industrial use such as house wraps, roofing materials, roofing materials, etc., and all uses requiring moisture permeability and waterproofness such as agricultural sheets. It is possible.

Background art

[0002] Stretchable nonwoven fabrics made of thermoplastic polyurethanes, isoprene-based elastomers and the like have been used for clothing applications such as gloves and bibs. However, these resins have problems of poor solvent resistance and poor weather resistance, and their use has been limited. In addition, non-woven fabrics using polyester fibers that exhibit crimping due to heat have been used mainly for medical applications such as pulp base fabrics and wound tapes. Although these have excellent solvent resistance and weather resistance, they have a problem that they are difficult to use in applications with large deformation due to a large residual strain rate. In addition, although olefin elastomers are used in engineering plastics, it is not easy to produce fine fibers due to problems such as high melt viscosity. In addition, stretchable nonwoven fabrics made of polyurethane as disclosed in Patent Document 1 have been used for medical applications such as taping materials and wound tapes because of their excellent recoverability. There is a need for a softer and more followable material, as well as a feeling of tension when moving a worn body part.

[0003] Further, as a laminate of a nonwoven fabric and a film, a composite in which a nonwoven fabric is laminated with a porous film typified by a polyolefin or fluorine-type resin porous membrane is known. For the formation, a method of forming a void by stretching or a method of directly forming a desired hole by a laser or the like is used. In this case, the film has virtually no holes It is not easy to increase the waterproofness because the door is open. If the waterproofness is increased, the moisture permeability decreases, and it is difficult to obtain desired properties such as humidity controllability. As a method for solving the above-mentioned problem, attempts have been made to convert a moisture-permeable waterproof material made of nonporous resin into a film. For example, Patent Document 2 discloses that a nonporous moisture-permeable film formed of a block copolymer polyester resin having a hard segment and a soft segment is bonded to a stretchable nonwoven fabric. However, the non-porous moisture-permeable film is bonded to a non-woven fabric by using an adhesive or by pattern bonding after forming the film. Not only is it excellent in balance with waterproofing, but it is not one that can be manufactured stably and adheres firmly.

[0004] That is, if the non-porous moisture-permeable film is made as thin as possible in order to increase the moisture permeability, the film will be torn due to unevenness of the nonwoven fabric when joining the films, This block copolymer polyester resin film is easily deformed due to elongation. Immediately, it is technically quite difficult to prevent the film from being broken during winding and unwinding of the thin film. At present, there are no practical applications. Further, a problem that the elasticity is hindered by the influence of the adhesive easily occurs. Furthermore, when materials with different elasticity are bonded, there are problems such as easy peeling at the stress concentrated part and peeling easily due to the difference in the expansion rate of moisture between the non-porous moisture-permeable film and the nonwoven fabric. Was.

Patent Document 1: Japanese Patent Application Laid-Open No. 2-14059

Patent Document 2: Japanese Patent Application Laid-Open No. 8-126663

Disclosure of the invention

Problems to be solved by the invention

[0005] The present invention provides a nonwoven fabric which has excellent stretchability and stretch recovery properties, is soft and has good followability to deformation, and has a small feeling of tension when worn. It is intended to provide a stable production method of a stretchable laminate having a strong adhesive force between the laminate and an ultra-thin stretchable film, and a suitable use of the laminate.

Means for solving the problem [0006] The present invention employs the following means in order to solve a powerful problem. That is, the first invention is a non-woven fabric mainly composed of polyester long fibers having a fiber diameter of 3-30 μΐη and a basis weight of 20-200 g / m ² , comprising a block copolymerized polyester having a hard segment and a soft segment. Wherein the elongation at break is 100% or more, the recovery rate at 20% elongation is 95% or more, and the stress at 100% elongation is 1.4 times or more the stress at 50% elongation. It is an elastic nonwoven fabric.

[0007] A second invention is the stretchable nonwoven fabric according to the first invention, wherein the long fiber contains 0.015% by mass of inorganic fine particles or a lubricant.

[0008] A third invention is the stretchable nonwoven fabric according to the first or second invention, wherein the thickness of the nonwoven fabric is 1.0 Omm or less.

[0009] A fourth invention is a stretch laminate comprising the stretch nonwoven fabric according to the first invention and a film having a thickness of 5100 µm adhered and laminated on the entire surface.

[0010] Next, a fifth invention is the stretchable laminate according to the fourth invention, characterized in that the film contains 0.01 to 5% by mass of inorganic fine particles or a lubricant. is there.

[0011] The sixth invention is directed to a block copolymer polyester having a hard segment and a soft segment. The nonwoven fabric having a fiber diameter of 3 to 30 μm is formed at 70 to 200 ° C. in at least one direction. A method for producing a stretchable nonwoven fabric, characterized in that the shrinkage is 5 to 80%.

[0012] The seventh invention is directed to a block copolymer polyester having a hard segment and a soft segment and having a fiber diameter of 3 to 25 μm. — Shrinkage by 80%, and then extruding a 5 to 50 μm thick film made of block copolymer polyester with a melting point of 150 to 230 ° C onto the nonwoven fabric to form an integrated laminate by extrusion lamination. It is a manufacturing method.

[0013] Further, an eighth invention is characterized in that a resin or a pigment is discontinuously printed on the surface of the stretchable nonwoven fabric according to the first invention or the stretchable laminate according to the fourth invention. This is a stretchable laminate.

[0014] A ninth invention is characterized by using the stretchable nonwoven fabric according to any one of the thirteenth to thirteenth inventions or the stretchable laminate according to any one of the fourth or fifth inventions. Medical sheet. The invention's effect

[0015] According to the present invention, it is possible to provide a stretchable nonwoven fabric that is excellent in stretchability and stretch recovery properties, is soft, has good shape-following properties, and has a small feeling of tension. In addition, the nonwoven fabric composite having a moisture-permeable and waterproof property obtained by laminating a film layer on a nonwoven fabric made of the block copolymerized polyester of the present invention can be used for clothing, medical applications, house wraps, roofing materials, roofing materials, heat exchange materials. It can be suitably used for general industrial applications such as heat exchangers, and applications requiring moisture permeability and waterproofness such as agricultural sheets.

BEST MODE FOR CARRYING OUT THE INVENTION

The stretchable nonwoven fabric of the present invention is a nonwoven fabric mainly composed of polyester long fibers having a fiber diameter of 3 to 30 μΐη and a basis weight of 20 to 200 g / m ² . If the fiber diameter is smaller than 3 μm, it is difficult to improve the post-processing such as fluffing or immediate embossing due to abrasion of the non-woven fabric. In addition, stress concentration easily occurs during elongation, and it becomes difficult to enhance elongation recovery. When the fiber diameter is larger than 30 xm, there is a sticky feeling when touched, and even if embossing or lubrication with lubricating material is performed, the dry feeling or the dry feeling cannot be improved. Within the scope of the study by the present inventors, it was not particularly preferable that the fiber diameter be between 3 and 15 zm. In addition, or low weight per unit area of the nonwoven fabric is 20gZm ² less than the non-woven fabric strength, ease a problem such as the formation spots of the non-woven fabric is noticeable Les,. If the basis weight exceeds 200 gZ m ² , the weight is too heavy, which is not preferable. When used in contact with a moving part such as a human body, an animal or a machine, the basis weight is preferably between 30 and 150 g / m ² , particularly preferably 40 and 100 g / m ² , and most preferably 50 and 90 g / m ² . a m ^2.

[0017] The stretchable nonwoven fabric of the present invention is a nonwoven fabric mainly composed of polyester-based long fibers, and other long fibers and short fibers are compounded in addition to the polyester long fibers as long as the effects of the present invention are not impaired. The content of the polyester filament is preferably 60% by mass. Long fibers are preferred because they have excellent strength properties and the finished nonwoven fabric has a smooth surface. It is also preferable that the surface is smooth because the adhesiveness with the film is improved because the adhesiveness with the film is good when the laminate is extruded later. When short fibers are combined by a needle punching method or the like, the texture becomes soft, and this is one of the preferred aspects when applied to clothing applications that come into contact with the human body. [0018] The nonwoven fabric of the present invention needs to have a breaking elongation of 100% or more, a 20% elongation recovery rate of 95% or more, and a stress force at 100% elongation of 1% of a 50% elongation stress. It must be at least 4 times. If the elongation is less than 100% or the 20% elongation / recovery ratio is less than 95%, a nonwoven fabric excellent in elongation and elongation / recovery, which is the object of the present invention, cannot be provided. . Furthermore, it is important that the stress at 100% elongation is at least 1.4 times the stress at 50% elongation. Existing polyurethane-based stretchable fibers have a ratio of stress at 100% elongation to stress at 50% elongation of about 1.0-1.3 times, but in this case, the initial deformation stress is high. When the non-woven fabric is stretched, a feeling of tension appears, which is not desirable. If the ratio of the stress at 100% elongation to the stress at 50% elongation is 1.4 or more, a moderate soft feeling and a moderate

It has dimensional stability (feeling power) and is easy to handle when pasted or wound on wound tapes or bandages. The value of the ratio between the stress at 100% elongation and the stress at 50% elongation is preferably 1.7 or more, more preferably 2.0 or more. The optimum value of this ratio depends on the basis weight of the nonwoven fabric, but if the basis weight is 80 g / m ² or less, the ratio value is preferably 1.5 or more.If the basis weight is greater than 8 Og / m ² Is preferably 1.7 or more.

[0019] The value of the ratio between the stress at 100% elongation and the stress at 50% elongation is adjusted by changing the copolymerization ratio of the block copolymerized polyester having a hard segment and a soft segment, and by changing the molecular weight of the soft segment. It is possible. The higher the soft segment ratio and the higher the molecular weight of the soft segment, the greater the value of this ratio can be adjusted. In addition, it is possible to control the condition by heat-treating the stretchable nonwoven fabric, such that the polymer is not deteriorated, the temperature range is lower, the heat treatment temperature is higher, or the shrinkage due to the heat treatment is larger. It is possible to adjust the value of this ratio to be large.

[0020] The nonwoven fabric of the present invention preferably has a thickness of less than 1. Omm, more preferably 0.5 mm or less, particularly preferably 0.35 mm or less. Since stretchable materials generally have a high coefficient of friction and are hard to slip, they have a problem in that they may induce a catching force, fray, or fuzz immediately when they come into contact with other objects. In particular, in the case of the nonwoven fabric of the present invention, when the thickness is more than 1. Omm, shedding force and squealing easily occur. The thinnest thickness is a thickness that can satisfy the basis weight of 20 g / m ² , but it is preferably 0.05 mm or more. Calendar to adjust thickness Performing a treatment or a heat embossing treatment is also a preferable embodiment.

In order to improve the feel of the stretchable nonwoven fabric or stretchable laminate of the present invention, the fiber preferably contains 0.01 to 5% by mass of inorganic fine particles or a lubricant. The inorganic fine particles are fine particles such as titanium oxide, montmorillonite, and carbon nanotubes, and are preferably uniformly dispersed in a polymer for producing fibers or films. Alternatively, it is also a preferable embodiment to form a core-sheath type composite fiber structure so that more inorganic particles are dispersed on the surface of the sheath portion. The particle size is preferably 1/10 or less of the diameter of a sphere-equivalent linear fiber in terms of mass, more preferably 0 or less, and particularly preferably 0.1 xm or less. The smaller the particles, the better the dispersion in the fiber. As the lubricant, it is preferable to disperse a heat-resistant material such as oleic acid amide or erlic acid amide / stearic acid amide in the polymer. These lubricants can migrate to the fiber or film surface over time to improve slipperiness and dryness. Promoting the migration of the lubricant by heat treatment is also a preferred embodiment. In particular, as one of the nonwoven fabrics of the present invention, there is a method of imparting excellent extensibility and elongation recovery rate by performing a heat shrink treatment, and in this case, migration of a lubricant can be promoted. it is conceivable that. The addition of a plurality of inorganic particles or the combined use of inorganic particles and an organic lubricant is also one of the preferred embodiments with high effects. If the total amount of the inorganic fine particles or the lubricant exceeds 5%, thread breakage occurs in the nonwoven fabric manufacturing process, and the back pressure of the polymer filter increases, causing a problem.

[0022] In order to improve the feel of the stretchable nonwoven fabric of the present invention, it is preferable to have a discontinuous embossing pressing portion, and the embossing treatment is performed so that the area ratio becomes 3 to 70%. Preferably. More preferably, the embossing area ratio is between 850% and particularly preferably 20-40%. If the embossing area ratio is small, the unique sticky feeling of the elastic body (elastomer) appears and it is not so desirable. If the area ratio is too large, the skin comes into contact with the embossed depressions, giving a sticky feeling. This phenomenon is considered to be that the feeling of dryness disappears when the contact area of the finger or the like with the skin increases. Therefore, the smaller the area of the embossing retainer is, the more dry it is. Therefore, the embossing retainer needs to be discontinuous. In addition, the depth of the embossed portion is approximately 0 from the surface of the unpressed portion. It is preferably 2 mm or more. If the emboss is too shallow, it will be difficult to give a dry feeling. When the area of every single island embossed pressing portion about 2 mm ² smaller than may be shallower relatively deep, but is necessary to have Sutame's dry feeling of performing deeper processing when the area is large is there. It is also desirable that the shortest adjacent contact distance between the embossed portions is 1.5 mm or less. If the distance is wider than 1.5 mm, the degree of adhesion to the skin will increase, and the stickiness tends to increase. It is preferably at most 1.2 mm, more preferably at most lmm, most preferably at most 0.8 mm. The shape of the embossing may be any of a circle, an oval, a diamond pattern, etc., and is not particularly specified.However, if the maximum width of the holding portion is more than about 2 mm, the feeling of stickiness tends to be easily felt. There is. It is also preferable to orient the fibers in the thickness direction of the nonwoven fabric by means such as hydroentanglement to further improve the dry feeling.

[0023] It is also a preferable embodiment to perform a treatment such as printing a resin having a dry feeling on the surface of the stretchable nonwoven fabric or stretchable laminate of the present invention. In addition, the design can be improved by adding a pigment during printing. The printing method is particularly preferable because continuous printing called solid printing is effective because discontinuous printing does not impair air permeability and moisture permeability. In particular, in the case of using it by attaching it to the skin, such as a wound dressing material or a wound tape, it is preferable that the air permeability is high. Therefore, it is preferable to adjust the printing area to be about 85%. If the printing area is too small, it is difficult to obtain the effect of improving slipperiness. If the area is too large, air permeability is impaired, which is not preferable. A particularly preferred printing area is 15-70%. As a printing method, a resin processing method of applying a resin or the like only to the vicinity of the surface, such as a spray method or a foaming method, which is suitable for gravure printing, off-drag printing, flexographic printing, or the like, may be used. The discontinuous printing pattern may be any of a dot, a line, and a plane, but the basic pattern is preferably as small as possible. It is preferable that the average interval between the printing surfaces is about 15 to 5000 μm.

When the stretchable nonwoven fabric or stretchable laminate of the present invention is used as a medical sheet, the recovery after 20% elongation is preferably 95% or more. It is more preferably at least 98%, most preferably 99. / ₀ or more. In particular, medical sheets such as bandages, plaster base cloths, pulp materials, wound dressings, wound tapes, etc. In addition, it is necessary to have high deformability equivalent to that of a surface layer material such as skin to be contacted with and high strain recovery within the range. If the recovery rate after 20% elongation is less than 95%, problems may occur such as the inability to follow the deformation during repeated use and the surface being wavy due to the large residual strain of the nonwoven fabric. In addition, if the recovery rate is poor, problems such as occurrence of seams after deformation may occur.

[0025] In order to increase the elongation recovery rate of the extensible nonwoven fabric, it is preferable that the nonwoven fabric is subjected to a shrinkage treatment of at least 580% in at least one direction at a temperature of 70 to 200 ° C. It is presumed that the shrinkage treatment relaxes the tension of the fibers in the nonwoven fabric and stabilizes the fiber structure. The conditions for the shrinkage treatment are either dry heat or wet heat. The force depends on the thermal properties of the polymer. In the case of a block copolymer polyester consisting of a hard segment and a soft segment, the dry heat is 70-200 ° C. C temperature is appropriate. If the temperature is lower than 70 ° C, it takes too much time S to generate shrinkage to improve the elongation and recovery, while if the temperature is higher than 200 ° C, a part of the fiber melts to give a hard texture. Or shrinkage becomes too large, and the problem of the nonwoven fabric surface becoming wavy tends to occur. If the shrinkage is less than 5%, the effect of improving elongation recovery is small. If it exceeds 80%, the texture of the nonwoven fabric and poor appearance tend to occur.

[0026] Further, the stretchable nonwoven fabric of the present invention is also one of the preferable modes in which a needle punching process or a hydroentanglement process is performed for the purpose of increasing the entanglement of the fibers, increasing the bulk or softening the fibers. . It is possible to increase the fiber adhesion with a binder such as resin to prevent fluff, but it is necessary to consider the adhesion with the polyester copolymer.

[0027] Further, it is particularly preferable basis weight of the stretchable nonwoven fabric when it is laminated with the film layer is a polyester non-woven fabric of 20- 80g / m ^2. If the basis weight of the nonwoven fabric is too high, only the lightness is lost, and the sheet becomes too hard, causing stiffness at the time of folding, and the moisture-permeable membrane layer tends to be easily broken.

[0028] Further, as one of preferred embodiments of the present invention, there is an elastic laminate in which a film is entirely adhered and laminated on the elastic nonwoven fabric of the present invention. The material of the film is preferably formed of a block copolymer polyester having a hard segment and a soft segment, and is preferably a block copolymer polyester having a melting point between 150 and 230 ° C. Soft segment The components contribute to the expression of elasticity. It is presumed that this copolymerized polyester adsorbs water molecules on the soft segment portion, and the water molecules permeate or diffuse inside the amorphous resin layer, thereby obtaining moisture permeability. For example, by increasing the copolymerization amount of the glycol component as a soft segment, the moisture permeability improves, but the strength of the resin itself decreases. The hard segment component of the copolymerized polyester is selected from aromatic polyesters, alicyclic polyesters, derivatives thereof, and mixtures thereof, and the soft segment component is polytetramethylene glycol or poly (ethylene / propylene) block glycol. It is preferable to select from polyethylene glycol and the like.

[0029] When a film is bonded to a nonwoven fabric, the materials may be exactly the same, even if the ratio and molecular weight of the hard segment and the soft segment are different. In many cases, block copolymerized polyester is a resin with a highly hydrophilic composition, and tends to swell when it contains a large amount of water. Easy to occur. When the film and the nonwoven fabric are bonded together, the composition of the film and the nonwoven fabric is preferably a resin having a closer composition and a closer equilibrium moisture content.

[0030] The lamination of the film and the nonwoven fabric is particularly preferred in which the film is bonded by extrusion lamination. The laminating method is that the film is stretchable, and in some cases, the stretchable nonwoven fabric is stretched by about 5 to 50% and bonded together, so that the film bends into a small strip after the stress is released. It is possible to give the body elasticity. If the stretchability of the nonwoven fabric is smaller than the stretchability of the film, it is possible to increase the stretchability by a similar mechanism by attaching the stretched film to the nonwoven fabric. In general, when the films are bonded, the elongation recoverability tends to decrease. Therefore, it is preferable that the film is not too thick. As a method of laminating and bonding, an extrusion lamination method is preferable, but from the viewpoints of recyclability and simplicity, a heat lamination method, an ultrasonic welder method, and the like can also be employed.

[0031] When the stretchable nonwoven fabric of the present invention is laminated by extrusion lamination or the like with a 5 100 µm thick film made of a block copolymerized polyester comprising a hard segment and a soft segment having an appropriate composition, a moisture-permeable nonporous film is obtained. Can be firmly adhered and stably bonded. Able to obtain a stretchable laminate that is water-based and has a moisture permeability of 500-10000 g / m ² ′ for 24 hours. When such a laminate is used for clothing, it is particularly preferable that the moisture permeability be in the range of 2000 to 10 000 g / m ² ′ for 24 hours. If the film thickness is greater than 100 μΐη, it is possible to increase the water pressure resistance, but a problem with inferior moisture permeability arises, and it is particularly preferably 50 am or less immediately. On the other hand, if the film thickness is less than 5 μm, the water resistance is apt to decrease because the film is destroyed when an external force is applied or a water pressure is applied, which is not preferable. By making the nonwoven fabric and the film similar materials, it is easy to prevent peeling at the interface.

[0032] In the case where a film layer of a block copolymer polyester composed of hard segments and soft segments is formed on the nonwoven fabric surface by extrusion lamination, the melting point of the polyester resin is between 150 and 230 ° C, and the MFR ( Melt flow rate: 230 according to ASTM D1238). It is a resin with a C of about 30-300 g / 100 minutes, and is preferably processed at a temperature 2040 ° C higher than the melting point. The melting point of polyester and the apparent melt viscosity at the time of processing can be determined by the structure and composition ratio of the soft segment. In order to set the water pressure resistance and moisture permeability to desired values, it is particularly preferable to set them in these temperature ranges. The higher the processing temperature, the higher the bonding strength between the finolem and the nonwoven fabric can be. However, if the temperature is too high, the variation in the thickness of the film in the width direction and / or the longitudinal direction becomes large, and production becomes difficult.

[0033] Preferably, the MFR is between 30 and 150 g / 10 minutes at 230 ° C. In order to reduce fluctuations in the thickness, width direction and / or longitudinal direction of the film during extrusion lamination, it is preferable to use this MFR. If the MFR is higher than 300 g / 10 minutes, the fluctuation of the width becomes large due to the influence of the ear fluctuating, and if the MFR is too small, it is difficult to form the film to the thinness as the object of the present invention.

[0034] In order to improve the adhesiveness between the film and the nonwoven fabric, it is preferable that the nonwoven fabric is preheated to a temperature range of about 40 to 100 ° C and then brought into contact with the film. Further, in order to increase the peel strength, it is desirable that a certain amount or more of fibers are arranged near the peel direction. This is presumed to be because the bonded surface is continuous along the axial direction of the fiber, so that it is possible to increase the effective bonded area against the peeling force. Fiber array is measured directly Since it is not easy, it can be almost estimated by measuring the strength in each direction in the plane of the nonwoven fabric. In other words, the greater the number of fibers in that direction, the higher the strength in that direction. Therefore, it is preferable that the nonwoven fabric has a uniform fiber arrangement and a high overall peel strength, because the strength in the longitudinal direction and the strength in the lateral direction of the nonwoven fabric are close to each other. Specifically, it is particularly preferable that the ratio of the longitudinal strength to the transverse strength is between 0.75 and 1.4 in order to increase the peel strength.

[0035] Here, the conditions for the extrusion lamination are as follows: a moisture-permeable resin is extruded from a T-die with approximately the same width as the nonwoven fabric to form a film-like film, and is brought into contact with the nonwoven fabric at an offset of about 530 cm, and then is subjected to a mouth roll. It is preferred that the film be cooled while sandwiching and bonding. The copolyester film layer that can be used in the present invention has high adhesiveness, so that the releasability from a roll is deteriorated, and as a result, the processability may be deteriorated. For this reason, at least the roll that comes into contact with the membrane should be coated with a resin with good release properties, such as PTFE, or should be matted.

[0036] When a nonwoven fabric formed of a block copolymer polyester composed of hard segments and soft segments is laminated with a film composed of a similar block copolymer polyester, the fiber diameter must be 3 to 30 m. Particularly preferred is 5-18 / im. According to the inventor's experience, when the thickness of the membrane is thinner than 1/2 of the average fiber diameter, there is a tendency that a problem that the membrane is torn or peeled off from the fiber layer tends to occur. On the other hand, when the fiber diameter is smaller than 3 / m, fluffing occurs at the time of handling or the like, and as a result, the problem that the peel strength becomes small easily occurs.

[0037] It is recommended that the block copolymerized polyester nonwoven fabric of the present invention is subjected to corona treatment or the like as necessary to improve the adhesiveness to a film or the like. Further, the nonwoven fabric or film of the present invention can be mixed with an appropriate antioxidant, weatherproofing agent, lubricant, coloring agent and the like. In particular, when used in direct sunlight, such as house wrap applications, a UV absorber, UV stabilizer, and antioxidant should be added in a total amount of about 0.1 to 15% by mass to prevent deterioration due to UV rays. Is preferred.

Example

Next, the present invention will be described with reference to specific examples. The measurement method used in the present invention is as follows. It is a cage. (Thickness) The thickness under a load of 20 g / cm ² was measured with a Peacock thickness gauge. (Elongation at break and stress at elongation) Cut the non-woven fabric into a rectangle of 5cm x 10cm, and measure the stress at the time of 50% deformation and 100% deformation at a constant crosshead speed of 10cm / min with an effective width of 5cm and a gauge length of 2.5cm. The elongation at break was measured. (20% elongation recovery rate) In accordance with the JIS L 1096 B2 method, after leaving for 20% elongation with respect to the initial gauge line distance L0 under no load, leave for 1 minute and then remove the weight to reduce the gauge line distance L1. It was measured. The residual strain was measured by the following equation. 20% elongation recovery rate (%) = 1 1 ÷ L0 X 100

(Moisture Permeability) Measured according to JIS-L1099 [4.1.1 (A-1 method), using calcium chloride, φ70 mm]. (Waterproof pressure) The measurement was carried out according to JIS-L1092 [5.1 B method (high water pressure method)]. (Fibre diameter) A photograph was taken at an appropriate magnification using a scanning electron microscope, and about 20 to 200 fibers were randomly selected to measure the distance between the side faces of each fiber. The fiber diameter was measured assuming a circular cross section by converting from the photographing magnification. (Example 1) Toyobo Co., Ltd. copolymerized polyester resin perprene P40B (MFR at 190 ° C, 10 g / 10 min, melting point: 180 ° C) was dried at 215 ° C by a spun bond method with a diameter of 14 / im and a basis weight. A nonwoven of 42 / m ² was made. Followed by 150. (The non-woven fabric was processed using a hot embossing roll so that the shrinkage of the non-woven fabric was 20%. The non-woven fabric had a basis weight of 50 g / m ² and a thickness of 0.35 mm. The elongation at break was 295%. The 20% elongation recovery rate was 100%, and the stress at 50% elongation and the stress at 100% elongation were 5.6 N and 11.9 N, respectively. The value was 2.1. It was recognized that it was suitable for use as a single piece of blaster cloth or a wound tape, which gave a firm feeling even when the hand was moved when the adhesive layer was attached to the elbow.

(Example 2) A polymer obtained by adding 0.5% by mass of erlic acid amide to Toyobo Co., Ltd. perprene resin GP550 (MFR at 230 ° C: 34 g / 10 min, melting point: 174 ° C) was added at 230 ° C. And then extruded, contacted with the stretchable nonwoven fabric of Example 1 having a basis weight of 53 g / m ² with an offset of 15 cm, and bonded so as to have an average thickness of 20 μm. The moisture permeability of the obtained nonwoven fabric was 8650 g / m ² ′ for 24 hours, and the water pressure resistance was 1280 mmAq, showing extremely excellent performance. The 20% elongation recovery rate of the laminated product was 96%, and there was no particular problem. The film side also had a soft touch.

(Example 3) Perprene P30B (23) of a copolymerized polyester resin manufactured by Toyobo Co., Ltd. 0 ° C MFR25, mp 160 ° C) in the El forces acid amide extrusion Τ die force 0 - 03 wt% added polymer at 21 5 ° C, an embodiment of the basis weight of 53 g / m ² at an offset of 15cm The non-woven fabric was brought into contact with the nonwoven fabric of No. 1 and bonded so as to have an average thickness of 18 / m. The obtained nonwoven fabric showed excellent performance with a water pressure resistance of 2260 mmAq for 4410 gZm ² ′ for 24 hours. The tactile sensation on the finolem surface was not as great as in Example 2, but not so much as to cause a major problem. An area ratio of 5% by mass of flesh-colored pigment added to a urethane resin hardened by gravure printing on the film surface. Printed by dot processing of / ₀ . The printed surface showed a suitable texture with no stickiness.

(Comparative Example 1) A commercially available stretchable nonwoven fabric made of polyurethane in Example 1 was evaluated. The fiber diameter was 20 μπι, the basis weight was 50 g / m ² , and the thickness was 0.27 mm. The elongation at break was 30%, and the elongation / recovery rate at 20% was 91%. The stress at 50% elongation and the stress at 100% elongation are 6.8N and 8.4N, respectively. /. The value of the ratio of the stress during elongation was 1.2. When the adhesive was attached to the elbow with a large deformation resistance when the non-woven fabric was stretched and it was attached to the elbow, the hand felt strongly when the hand was moved.

Comparative Example 2 In the production of the nonwoven fabric of Example 1, the fiber diameter was changed to 27 μ 27η and the basis weight was changed to 200 g / m ² . The thickness of the obtained nonwoven fabric was 1.2 mm. Subsequently, the nonwoven fabric was processed using a hot embossing roll at 150 ° C so that the shrinkage of the nonwoven fabric became about 4%. The basis weight of the nonwoven fabric after processing was 209 g / m ² , and the thickness was 1.1 mm. The elongation at break was 181%, and the elongation recovery rate at 20% was 90%. The stress at 100% elongation and the stress at 50% elongation were 22.4N and 33. ON, respectively, and the values of the 100% -Shincho B temple stress and the 50% -Shincho B temple stress were 1.5. Met. The feel of the nonwoven fabric was sticky and rubber-like, which was not preferable.

(Comparative Example 3) Using a polymer obtained by adding 7% by mass of oleic acid amide to the perprene {40} resin used in Example 1, a diameter of 14 zm and a basis weight of 42 g / m 2 at 215 ° C by a spun bond method. ^{2. A} 0.35 mm thick nonwoven fabric was prepared. Many yarn breaks occurred during spinning, and the texture of the sheet was significantly reduced. Subsequently, processing was performed using a hot embossing roll at 150 ° C so that the shrinkage of the nonwoven fabric became 20%. The elongation at break was 190%, which was lower than that in Example 1, and the elongation recovery rate at 20% was 93%. The stress at 100% elongation and the stress at 50% elongation are 4.8N and 9.3N, respectively, and 100. /. Elongation stress and 50. /. The value of the ratio of stress at elongation is 1.9. I got it. When touching the non-woven fabric, there was a dry feeling, but the thread breaks were rough and unpleasant. In addition, elongation recovery was insufficient, and the object of the present invention was not achieved. Industrial applicability

The stretchable nonwoven fabric and stretchable laminate of the present invention are excellent in stretchability and stretch recovery, and provide a nonwoven fabric that is soft and has a low feeling of stretch when worn with good followability to deformation. It can be used for clothing such as gloves and bibs, as well as for a wide range of applications such as pulp base fabrics and wound tapes, and has a strong adhesive strength between the nonwoven fabric and ultra-thin elastic film. It provides a stable production method for, and is greatly contributed to the industry.

Claims

The scope of the claims

[1] A non-woven fabric consisting mainly of polyester-based long fibers with a fiber diameter of 330 μm and a basis weight of 20 to 200 g / m ² , consisting of a block copolymerized polyester having a hard segment and a soft segment. An extensible nonwoven fabric characterized by having a degree of 100% or more, a 20% elongation recovery rate of 95% or more, and a stress at 100% elongation of at least 1.4 times the stress at 50% elongation.

[2] The stretchable nonwoven fabric according to claim 1, wherein the long fiber contains 0.01 to 5% by mass of inorganic fine particles or a lubricant.

[3] The stretchable nonwoven fabric according to claim 1 or 2, wherein the thickness of the nonwoven fabric is 1 Omm or less.

[4] A stretchable laminate comprising the stretchable nonwoven fabric according to claim 1 and a film having a thickness of 5 to 100 μΐη adhered and laminated on the entire surface.

[5] The stretchable laminate according to claim 4, wherein the film contains 0.01 to 5% by mass of inorganic fine particles or a lubricant.

[6] A non-woven fabric made of a block copolymer polyester having a hard segment and a soft segment and having a diameter of 30 μm is shrunk by 580% at 70 200 ° C in at least one direction of the non-woven fabric. A method for producing a stretchable nonwoven fabric.

[7] A non-woven fabric having a fiber diameter of 25 μm comprising a block copolymerized polyester having a hard segment and a soft segment is shrunk by 580% at 70 200 ° C in at least one direction of the non-woven fabric. A method for producing an elastic laminate, comprising laminating and unifying a 5 to 50 μm thick film made of a block copolymer polyester having a melting point of 150 to 230 ° C by extrusion lamination.

[8] A stretchable laminate obtained by printing a resin or pigment discontinuously on the surface of the stretchable nonwoven fabric according to claim 1 or the stretchable laminate according to claim 4.

[9] A medical sheet comprising the stretchable nonwoven fabric according to any one of claims 13 to 13 or the stretchable laminate according to any one of claims 4 and 5.