WO2006080246A1

WO2006080246A1 - Stretch sheet, adhesive skin patch and process for producing them

Info

Publication number: WO2006080246A1
Application number: PCT/JP2006/300820
Authority: WO
Inventors: Shigeki Tanaka; Masataka Adachi
Original assignee: Toyo Boseki Kabushiki Kaisha
Priority date: 2005-01-31
Filing date: 2006-01-20
Publication date: 2006-08-03
Also published as: JP4806935B2; JP2006207092A

Abstract

A nonwoven fabric that due to having of appropriate drape at the time of attachment or pasting, excels in handling easiness when used as a base cloth of adhesive skin patch, etc., and that after initiation of use, excels in elongation recovery, realizing enhanced softness and high follow property and is relieved in stiffness feeling. There is provided a stretch sheet of 20 to 200 g/m2 basis weight characterized in that the breaking elongation thereof in at least one direction is ≥ 100%, and that the tensile stress at 10% elongation measured upon a procedure consisting of first performing an elongation deformation as large as ≥ 20%, thereafter removing the deformation load and once more performing elongation is in the range of 3 to 85% based on the initial value prior to the large deformation.

Description

Specification

Stretchable sheet and patch and method for producing them

Technical field

[0001] The present invention relates to a stretchable sheet using a nonwoven fabric or a film excellent in stretchability and stretch recovery properties. Furthermore, with regard to medical or sanitary materials such as wet or dry patches and bandages, taping materials, wound tapes, surgical dressings, etc., there is a good feeling of wearing because of good stretchability and stretch recovery, and the first attachment and attachment The present invention relates to an adhesive patch that is sometimes relatively high and exhibits tensile stress, but is soft and has low deformation resistance during use, or an elastic sheet suitably used therefor. Further, in the present invention, a non-woven fabric made of block copolymer polyester and a non-woven fabric composite having moisture permeability and waterproof properties by bonding a film layer to the non-woven fabric are used for apparel, house wrap, roofing materials, roofing materials, thermal materials. It can be used for general industrial applications such as exchangers, and for all applications that require moisture and waterproof properties such as agricultural sheets. It can also be used as a non-slip material. Background art

Conventionally, stretchable nonwoven fabrics and films having stretchability have been widely used in fields and applications that require stretchability. For example, stretchable nonwoven fabrics and films made of thermoplastic polyurethane, isoprene-based elastomers, etc. are used for apparel such as gloves and bibs. However, these resins have poor solvent resistance and weather resistance, so their use is limited.

[0003] Therefore, non-woven fabrics using polyester fibers that develop crimps when heated as stretch nonwoven fabrics and films with excellent solvent resistance and weather resistance, mainly for medical applications such as S-pap base fabric and wound tape For these, although solvent resistance is excellent in weather resistance, when subjected to large deformation, since the residual strain rate is large, it is difficult to use for applications with large deformation. there were.

[0004] In addition, although olefinic elastomers are used for engineering plastics, etc., there are problems with high viscosity and other applications for olefinic elastomers that are not easy to produce fine fibers. The [0005] In addition, stretchable nonwoven fabrics made of polyurethane have been used for taping materials and wound tapes because they have excellent recoverability and have many achievements in medical applications (for example, see Patent Document 1). Due to the high stress, there is a sense of tension when moving the human body, so there has been a demand for a softer and more conformable nonwoven fabric.

[0006] A block copolymer polyester is known as a material having few problems as described above, and has been used for various applications because of its excellent stretchability and weather resistance.

[0007] However, even when a block copolymer polyester is used, the problem inherent to stretchable fabrics, such as being easily scratched or rubbed at the time of use, is not solved even when a surface copolymer is used. As a means for solving the problem, a method of applying a slippage adjusting liquid such as a resin containing titanium oxide has been disclosed (for example, see Patent Document 2). There is a possibility that problems may occur, such as impediments to air permeability and air permeability inherent to nonwoven fabrics.

[0008] Furthermore, the stretchable nonwoven fabric has a lower tensile resistance, so it can be used without any resistance when worn by being rolled or pasted, but it is bonded to the sheet because the sheet becomes too soft. There was a problem that sometimes wrinkles entered and it was difficult to paste. The powerful problem

In order to solve this problem, a method for restricting stretchability by applying a resin to the surface of the nonwoven fabric has been disclosed (see, for example, Patent Document 3), which reduces the flexibility of the stretchable material. There is a sense of tension when used because it is hard and has poor followability.

[0009] Further, as one of the usage forms of the stretchable fabric, a composite body in which a nonwoven fabric and a film having a moisture-permeable and waterproof function are bonded together is known. Examples thereof include a laminated composite of porous films represented by a fat porous membrane and the like. These films are excellent in moisture permeability, waterproofness, mechanical properties, chemical properties, etc., and are used for textiles for clothing and industrial materials, for example, depending on their properties. For forming the pores of the porous film, means such as directly forming desired pores with a laser or the like that forms voids by stretching are taken. However

In these methods, the production cost of the porous membrane is high and its use is limited. Also, the actual hole Since it is open, it is difficult to increase the waterproof property. If the waterproof property is increased, the moisture permeability decreases, and it is difficult to obtain desired characteristics such as humidity controllability. At present, there is no porous film capable of realizing high and stretchability in the composite.

[0010] As a method for solving these problems, an attempt has been made to form a moisture-permeable waterproof material made of a nonporous resin into a film, for example, a block copolymer polyester resin made of a node segment and a soft segment. It is disclosed to join a non-porous moisture-permeable film formed to a stretchable nonwoven fabric (for example, see Patent Document 4). However, a composite bonded with an adhesive V cannot achieve a performance with excellent balance between stretchability, moisture permeability and waterproofness.

This is because moisture permeability is almost inversely proportional to the thickness of the film, so it is necessary to make the non-porous moisture-permeable film as thin as possible in order to increase moisture permeability. However, there was a problem that the film was easily broken due to the unevenness of the nonwoven fabric. In addition, since the film contains soft segments, deformation due to elongation is likely to occur, and it is technically difficult to prevent film tearing when handling this thin film during winding or unwinding. The current situation is that it has not been put to practical use because it would lead to cost increases by force. Therefore, the development of a sheet with an excellent balance between moisture permeability and waterproofness is awaited! /

[0011] In addition, the problem of stretchability being hindered by the influence of adhesives is also likely to occur. When materials with different stretchability are used together, a material with low elongation may be destroyed during stretching, or a portion where stress is concentrated. The force with which it was easy to produce peeling was preferable. In addition, the resin that is generally used as a raw material for non-porous moisture-permeable films swells when the hydrophilicity is high and the moisture content is high, and the swelling rate is different from that of the non-woven fabric, which is a reinforcing material. There was a problem.

Patent Document 1: JP-A-2-14059

Patent Document 2: Japanese Patent Laid-Open No. 11-9632

Patent Document 3: Japanese Patent Laid-Open No. 11 81151

Patent Document 4: JP-A-8-126663 Disclosure of the invention

Problems to be solved by the invention

[0012] The present invention relates to a stretchable sheet having excellent stretchability and stretch recovery, softer and better followability, and less stretch feeling. In particular, it is an object of the present invention to provide a sheet material such as a nonwoven fabric and a film, which is easy to put on at an early stage, a patch using the same, and a method for producing the same.

[0013] In order to provide a stretchable sheet that solves the problems that are intensive, the following measures are taken.

That is, (1) a sheet having a basis weight of 20 to 200 gZm ² and having a breaking elongation of at least 100% in at least one direction, and for the first time after a large elongation deformation (first deformation) of 20% When the deformation load is removed and stretched again (second deformation), the tensile stress at 10% elongation is 3% of the initial value before (first deformation) (first deformation). The elastic sheet is characterized by being 85% or less, and (2) The surface of the sheet is coated with a resin having an area ratio of 3 to L00%. (1) or (2) characterized in that it comprises at least one layer of a stretchable sheet, (3) a non-woven fabric having a fiber diameter of ~ 50 microns and a volume filling rate of between 5-30% (4) Block-copolymerized polyester resin, hard polyurethane resin, polyurethane resin, The elastic sheet according to any one of (1) to (3), characterized in that the main raw material is any one of a fin-based resin and a polyamide-based resin, (5) (1) to (3) The stretchable sheet described in 1. is a nonwoven fabric, and a stretchable sheet having a thickness of 5 to: L00 micron stretched on one side of the nonwoven fabric, (6) (1) to (5) A patch characterized by the presence of a water-based or solvent-based drug or a gel-like layer on one side of the sheet, (7) a block copolymer polyester or polyurethane comprising a hard segment and a soft segment Polyolefin and polyamide are subjected to 5-80% shrinkage treatment at 70-200 ° C for a long fiber nonwoven fabric with a fiber diameter of 3-50 microns consisting of shear force or an extruded film made of the same material, and then the pigment is added. Do not use printing materials or media with different elongation, such as medium. Is the manufacturing method of the stretchable sheet, characterized in that at least print 0. l~5g / m ² on one surface of the fabric

The invention's effect [0014] The stretchable sheet and patch according to the present invention have a high degree of elongation at break in at least one direction and a small tensile stress after a large deformation, so that there is little soft and good stretch feeling. In particular, there is an advantage that it is easy to put on at the early stage. Brief Description of Drawings

[0015] [Figure 1] Tensile test stress-strain curve of nonwoven fabric

Explanation of symbols

[0016] 1: It is a stress strain curve in the forward path at the time of the first deformation.

2: Stress-strain curve on the return path during the first deformation

3: Stress strain curve (outward path) at the time of second deformation

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail.

The elastic sheet of the present invention is easily deformed by itself, and is composed of a nonwoven fabric, a sheet, or a composite thereof having a breaking elongation of 100% or more in at least one direction mainly composed of an elastomer or a rubbery material. It is preferable. This is because when the elongation at break is less than 100%, for example, when used as an adhesive, it cannot follow human movement, and the deformation followability is insufficient in actual use. Further, even a short fiber nonwoven fabric using a highly shrinkable fiber such as a three-dimensional crimped fiber or a composite thereof is applicable as long as the elongation at break is 100% or more. Further, the breaking elongation is preferably 200% or more, particularly preferably 250% or more. The upper limit of the elongation at break of the present invention is not particularly limited, but in the region exceeding 600%, the necessity for practical use becomes poor, but the handleability is inferior.

[0018] The stretchable sheet of the present invention preferably has an elongation recovery rate of 50% or more after 20% elongation. If it is less than 50%, it is difficult to follow the shrinking deformation, and problems such as wrinkles are likely to occur. A particularly preferred elongation recovery rate is 80% or more. The stretchable sheet of the present invention has a tensile deformation at the time of 10% extension when the large deformation (first deformation) of 20% or more is performed for the first time and then the deformation load is removed and the film is stretched again (at the second deformation). The force is preferably 3% or more and 85% or less with respect to the initial value before the first deformation (at the time of the first deformation). As a result, when the nonwoven fabric of the present invention is used as a patch, bandage, wound tape, etc., it has an initial tensile stress to some extent, so that it is easy to handle and easy to wear. However, when it is used while being stretched, the tensile stress is reduced and the followability to deformation is sufficient, while the unpleasant sensation such as the skin being pulled is eliminated, and blood circulation by long-time tightening is eliminated. It is possible to prevent the occurrence of inhibition or the like.

[0019] It is preferable that the characteristic of changing the tensile stress is satisfied in at least one arbitrary direction of the sheet material. In particular, it is preferable that the characteristic is the same in another direction in which the angle is different by 20 degrees or more. If the elongation at which the tensile stress changes (ie, the amount of strain) is about 20%, there is no problem in use, and the elongation can be changed as necessary. Preferably, the elongation is 50% or less. There is preferably a change in tensile stress. Even a nonwoven fabric with a breaking elongation of less than about 100% may behave in this way, but because the nonwoven fabric itself breaks along with the decrease in tensile stress, the subsequent stretch recovery is reduced. This is not preferred and is different from the present invention.

[0020] On the other hand, non-woven fabrics with a high elongation at break and elongation recovery rate are hardly accompanied by structural changes of the non-woven fabric itself at deformations of about 20%, so there is almost no change in stress. In the present invention, it is preferable that the tensile stress at the time of 10% elongation after approximately 20% elongation deformation is 3% or more and 85% or less after the large deformation with respect to the initial value. The timing for evaluating the tensile stress may be the stress at the time of 10% elongation before the first 20% deformation and after subsequent deformation of 1 degree or 2 to 10 degrees. If this value is 3% or more and 85% or less of the initial value, it is preferably 20 to 80%, particularly preferably 30 to 60%. If it decreases to 3% or less from the initial stage, the strength and elongation characteristics of the nonwoven fabric may deteriorate, which may cause problems with durability.In addition, the shrinkage force becomes insufficient, and the followability to deformation disappears. This may cause generation, peeling from the contacted body, and the like. If it is higher than 85%, the contraction force becomes excessive in practical use, making it difficult to realize a soft feeling. Even when deformation of about 20% is repeated, the stress decreases once, and thereafter, the stress is almost the same with no significant change in the 10% stress.

[0021] The material of the sheet such as a nonwoven fabric or a film used in the present invention may be any polyester-based elastomer, polyolefin-based elastomer, polyurethane-based resin, or polyamide-based resin if it is a stretchable material. Etc. are raised. The present invention can also be applied to a short fiber nonwoven fabric using three-dimensional crimped fibers. In that case, nylon is a polyester. Fibers of materials such as stealth, vinylon, and acrylic can also be mixed and used. In order to increase durability against stretching fatigue, it is also preferable to perform post-crosslinking treatment with an electron beam after fiberization, which is one of the forms.

[0022] Within the scope of the study by the present inventors, a block copolymerized polyester comprising a hard segment and a soft segment is particularly preferred for practicing the present invention with a small initial tensile resistance S. Since the soft segment component contributes to the development of stretchability, it is possible to change the segment ratio and molecular weight to achieve desired stretchability, stretch recovery properties, and durability against dry cleaning solvents and adhesive agents. Etc. can be controlled. Even if this copolyester is a non-porous film, moisture permeability can be obtained by adsorbing water molecules to the soft segment part and allowing water molecules to permeate or diffuse into micro brown particles inside the amorphous resin layer. it is conceivable that. For example, as a soft segment, increasing the amount of copolymerization of the glycol component improves the moisture permeability, but decreases the strength of the resin itself. The hard segment component of the copolyester is selected from aromatic polyester, aliphatic polyester, their derivatives or mixtures thereof, and the soft segment component is polytetramethylene glycol or poly (ethylene Z propylene) block poly. It is preferable to choose power such as Dalicall. When a film is laminated on a non-woven fabric, the materials may be exactly the same, or it may be a problem if the ratio and molecular weight of the hard segment and soft segment are different.

[0023] stretchable sheet 3 to 30 microns fiber diameter when a nonwoven fabric, the nonwoven fabric is preferably made mainly of polyester long fibers basis weight of 2 0 to 200 g / m ² of the present invention! /,. Fiber diameter is 3

,

If it is thinner than Cron, it is difficult to improve the non-woven fabric even if it is post-processed by fuzzing or immediately embossing due to wear or the like. In addition, stress concentration is likely to occur during elongation, and it becomes difficult to increase stretch recovery. If the fiber diameter is thicker than 30 microns, there will be a sticky feeling when touched, and even if embossing is performed, the dry feeling or smooth feeling cannot be improved even if a lubricant is added. In addition, if the fiber diameter is large, the unevenness of the nonwoven fabric tends to increase. Within the scope of the study by the present inventor, it was particularly preferable that the fiber diameter was between 3 and 15 microns. [0024] If the basis weight of the nonwoven fabric is less than 20 gZm ² , the strength of the nonwoven fabric tends to be low, and the joint spots of the nonwoven fabric tend to be noticeable. When the basis weight exceeds 200 gZm ² , the weight is too heavy, which is not preferable. If used in touch contact with the operation portion such as an animal or a machine such as a human body, basis weight is the preferred tool particularly preferably be between 30~150gZm ^² 40~: LOOgZm ^2, and most preferably 50～90GZm ² Met. Further, when the stretchable sheet of the present invention is a film, it is preferably a film having a thickness of about 10 to 200 microns. If the thickness is smaller than 10 microns, it is easy to tear and the rigidity is too small to make handling difficult. On the other hand, if the thickness is too large, the tensile resistance at the time of wearing becomes large and the feeling of wearing becomes worse. If necessary, the structure may be a composite of non-woven fabric and film.

[0025] The elastic sheet of the present invention is coated with a pigment, acrylic resin, urethane resin, medium, or the like on the surface so that the area ratio is 3 to 100% by printing or spraying. Preferably it is. When coating is performed so as to cover 100% of the surface, the air permeability may be impaired by the resin material, so the area ratio is preferably 3 to 85%, particularly preferably 8 to 80%. Since these coating layers generate resistance at the time of initial deformation, a relatively high tensile stress can be obtained, so they can be wrapped around the arm or attached to the skin with pressure sensitive adhesive. When doing this, put the appropriate waist down to make the installation work easier. When the nonwoven fabric is deformed greatly during pasting or use, the coating layer is destroyed and the stress during the second and subsequent deformations is reduced, so that a soft and non-tacky texture can be obtained during use. The thickness of the coating layer is preferably between 5 and 350 microns, particularly preferably between 10 and LOO microns, and most preferably between 15 and 50 microns. If the thickness of the coating layer becomes too large, the cooperation of the resin layer itself will increase, and at the same time, reinforcement with fibers will be made, and it is difficult for structural changes of the coating layer to occur before and after large deformation. It becomes difficult to cause changes in tensile stress over time. The thickness of the coating layer is preferably 10 times or less the fiber diameter, particularly preferably 3 times or less. The coating may be applied to the front continuously, but the hardness may be controlled by dots or lines. In addition, this coating makes it possible to control the coefficient of static friction. The coefficient of static friction is preferably between 0.35 and L0 Particularly preferred is 0.5 to 0.85. The method of controlling the deformation hardness and friction coefficient can be adjusted by changing the thickness, the number of coatings, and the hardness of the grease.

[0026] Japanese Patent Application Laid-Open No. 11-81151 discloses a method of limiting stretchability by applying a resin to the surface of the nonwoven fabric, but the resin may be impregnated to a thickness of about 1Z3. In the present invention, the printing layer is applied to the surface of the sheet as much as possible, and the purpose and effect are completely different from the means for causing a change in stress due to structural breakage. Is. Therefore, the amount of greaves used in the present invention is also about 5 gZ m ²

Compared with the examples, the examples exemplified in JP-A-11-81151 are very different in the amount of slag from about 29 gZm ² .

[0027] The elastic sheet of the present invention preferably has a thickness of less than 1.5 mm, more preferably 0.5 mm or less, and particularly preferably 0.35 mm or less. Stretchable materials generally have a high coefficient of friction and are difficult to slip, and this has been a problem when they come into contact with other objects and can cause hooking force, or fluffing, or mechleting due to the hooking force. In particular, in the case of the nonwoven fabric of the present invention, when the thickness is thicker than 1.5 mm, there is a problem that a tension is likely to occur. It is also preferable to perform a calendar process or a heat embossing process to adjust the thickness. The apparent volume filling of the nonwoven was preferably between 5-30%. When the volume filling rate is lower than 3%, the shape stability of the nonwoven fabric is deteriorated. On the other hand, when the volume filling rate is higher than 30%, the softness is lost and a rubber-like texture is obtained.

[0028] In order to improve the tactile sensation of the stretchable nonwoven fabric sheet of the present invention, it is also one of preferable modes to disperse 0.01 to 5% of inorganic fine particles or a lubricant. As the inorganic fine particles, it is preferable to uniformly disperse fine particles such as titanium oxide, montmorillonite and carbon nanotubes in the polymer for producing the fiber film. Alternatively, it is one of preferred forms that a core-sheath type composite fiber structure is used so that more inorganic particles are dispersed on the surface. The size of the particles is preferably 1/10 or less of the sphere-corresponding straight fiber diameter in terms of weight, particularly preferably 0.2 microns or less, and particularly preferably 0.1 microns or less. The smaller the particles, the better the dispersion in the fiber. As the lubricant, a polymer having heat resistance such as oleic acid amide, L force acid amide or stearic acid amide is used. I prefer to disperse it. These lubricants can be moulded over the fiber or film surface over time to improve the slipperiness and dryness. It is also a preferred form to promote the migration of the lubricant by heat treatment. 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 heat shrink treatment, and at this time, it is possible to promote the migration of the lubricant. Conceivable. Adding a plurality of inorganic particles, or using inorganic particles and organic lubricants together is one of the preferred forms. If the total amount of inorganic fine particles exceeds 5%, thread breakage may occur in the nonwoven fabric manufacturing process, or the back pressure of the polymer filter will increase significantly, which is not preferable! ,.

In order to improve the feel of the stretchable nonwoven fabric of the present invention, it is also preferable to have a discontinuous embossing pressing part, and it is preferable that the embossing treatment is performed so that the area ratio is 3 to 70%. . More preferably, the embossed pressing area ratio is between 5 and 50%, particularly preferably 8 to 40%. The embossing area ratio is small, and the elastic body (elastomer) has a unique stickiness, which is not preferable. If the area ratio is too large, the skin will come into contact with the embossed depressions, resulting in a sticky feeling. This phenomenon is thought to eliminate dryness when the contact area of the finger or other skin increases. Therefore, the smaller the area of the embossing pressing part, the more dry it is. Therefore, the embossing pressing part needs to be discontinuous. Further, it is preferable that the surface force of the portion where the depth of the embossed portion is not suppressed is also about 0.2 mm or more. If the embossing is too shallow, it will be difficult to achieve a dry feeling. Even shallow relatively depth when the area of every single island embossed pressing portion about lmm ² less than

Although it is good, deeper processing is necessary to give a dry feeling when the area increases. In addition, it is desirable that the shortest adjacent contact distance of the embossed portion is 1.5 mm or less. 1. If the interval is wider than 5 mm, the degree of stickiness tends to increase because the degree of adhesion to the skin increases, which is not preferable. This is preferably 1.2 mm or less, more preferably 1 mm or less, and most preferably 0.8 mm or less. The shape of the emboss is not particularly specified as it is round, oval, or diamond pattern, but it is not preferable if the maximum width of the holding part is more than about 2mm, because it makes it easier to feel stickiness. I was strong. In addition, It is also preferable to orient the fibers in the thickness direction of the non-woven fabric by means such as hydroentanglement in order to further improve the feeling.

[0030] The surface of the stretchable nonwoven fabric or stretchable sheet of the present invention may be subjected to a treatment such as printing of a functional material such as a resin having a dry feeling for a purpose other than controlling the tensile stress. One of the preferred forms. In addition, adding a pigment to the printing agent will improve the design.

Is possible. The printing method is particularly preferred because it is effective even in continuous full-face printing, which is called solid printing, because discontinuous printing does not impair air permeability and moisture permeability. In particular, when used by adhering to the skin, such as a wound covering material or a wound tape, it is preferable that the air permeability is high, and therefore it is preferable to adjust the printing area to be about 1 to 85%. If the printed area is too small, an improvement effect such as slipping can be obtained 1, and if the printed area is too large, the air permeability is hindered. A particularly preferred printing area was 15 to 70%. The printing method may be gravure printing, off-duller printing, flexographic printing, or the like, or a resin processing method such as spraying or foaming, where a resin or the like is applied only to the vicinity of the surface. The discontinuous print pattern may be any of dot, line, and plane, but the basic pattern is as small as possible! / Is preferred!

[0031] When the stretchable nonwoven fabric or stretchable laminate of the present invention is used as a medical sheet such as a patch, the recovery rate after 20% elongation needs to be 95% or more. More preferably, it is 98% or more, and most preferably 99% or more. In particular, materials that come into contact with human bodies and animals such as bandages, plaster substrates, knitted materials, wound dressings, wound tapes, and omuts are highly deformed as well as surface materials such as skin that they are in contact with. And high strain recovery within that range. If the recovery rate after 20% elongation is less than 95%, problems such as failure to follow the deformation during repeated use and the surface becoming wavy due to the large residual strain of the nonwoven fabric may cause problems. Become. Or, a poor recovery rate may cause problems such as wrinkles after deformation, which is often not preferred.

[0032] In order to increase the elongation recovery rate of the stretchable nonwoven fabric made of thermoplastic resin, it is preferable that the nonwoven fabric is subjected to a shrinkage treatment of 5 to 80% in one direction even at a temperature of 70 to 200 ° C. It is presumed that the stretch recovery performance is improved because the fiber tension in the nonwoven fabric is released by the shrinking treatment and the fiber structure is stabilized. The temperature at which the shrinkage treatment is performed is appropriate to be 70 to 200 ° C in the case of a block copolymerized polyester composed of hard and soft segments due to the thermal characteristics of the polymer. If the temperature is lower than 70 ° C., there is a problem such that too much time is required to cause shrinkage to improve the stretch recovery. On the other hand, when the temperature is higher than 200 ° C., a part of the fibers are melted to form a hard texture, and the shrinkage is so large that the nonwoven fabric surface is likely to be waved, which is not preferable. If the amount of shrinkage is less than 5%, the effect of improving the stretch recovery is small. If it is 80% or more, the texture of the nonwoven fabric tends to cause poor appearance!

[0033] Further, as one of the preferred embodiments of the present invention, there is a stretchable laminate in which a film is laminated on a stretchable nonwoven fabric. Block copolymer having a melting point of 150 to 230 ° C on at least one side of the stretchable nonwoven fabric. It is also particularly preferred that a 5-50 micron thick film of polyester is extruded and laminated. Lamination can be done simply, but if the film is not stretchable, the stretchable non-woven fabric is stretched about 5 to 50% and bonded together to release the film into a small sheet shape after stress release. Therefore, the stretchability of the laminate can be obtained. If the stretchability of the nonwoven fabric is smaller than the stretchability of the nonwoven fabric, the stretchability can be increased by the same mechanism by laminating the nonwoven fabric with the film stretched more. Generally, it is preferable to be careful not to make the film too thick because the stretch recovery properties generally decrease when the films are pasted together. As a method of laminating and bonding, an adhesive method may be used, but from the viewpoint of recyclability, adhesion by a thermal laminating method, an extrusion laminating method, an ultrasonic welder method or the like is preferable.

[0034] A film having a thickness of 5 to 100 microns made of a block copolymer polyester composed of a hard segment and a soft segment having an appropriate composition is extruded and laminated on the stretchable nonwoven fabric of the present invention. ~ 10000gZm ² '24-hour moisture permeability can be achieved in the non-porous film state. When used for clothing, the moisture permeability is 20

It is particularly preferred to be in the range of 0 to 10000 gZm ² '24 hours. Film thickness is 100 If it is thicker than micron, the water pressure resistance can be increased, but the problem of poor moisture permeability is caused. On the other hand, if the film thickness is thinner than 5 microns, the water resistance is likely to be lowered because the film breaks when an external force is applied or when the water pressure is strong. By making the nonwoven fabric and film similar materials, it becomes easy to prevent peeling at the interface.

[0035] When a film layer of a block copolymer polyester comprising hard segments and soft segments is formed on the nonwoven fabric surface by extrusion laminating, the melting point of the polyester resin is between 150 and 230 ° C, and MFR It is a resin that is between about 30 and 300 gZlO min at 230 ° C, and it was particularly preferred to cache at a temperature 20 to 40 ° C above the melting point. The melting point of polyester and the apparent melt viscosity during processing are determined by the structure and composition ratio of the soft segment, but within the scope of the inventors' investigation, in order to set the water pressure resistance and moisture permeability to desired values. It was particularly preferable to set the temperature range. The higher the processing temperature, the higher the adhesive strength between the film and the nonwoven fabric. However, if the temperature is too high, the variation in the thickness in the width direction and / or the longitudinal direction of the film will increase, making production difficult.

[0036] The MFR is preferably 30 to 150 gZlO 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 be in this MFR. When the MFR is higher than 300 gZlO, the fluctuation of the width becomes large due to the influence of the edge vibration of the end portion, etc., and the unfavorable MFR becomes too small, it is difficult to form the film to the intended thickness of the present invention. . In addition, in order to improve the adhesion between the film and the nonwoven fabric, it was preferable to preheat the nonwoven fabric in a temperature range of 40 ~: LOO ° C and then contact it with the film.

[0037] The conditions for the extrusion lamination were as follows. The moisture permeable resin was extruded from the T-die in almost the same width as that of the nonwoven fabric to form a film-like film and contacted with the nonwoven fabric with an offset of 5 to 30 cm! It is preferable to cool the film at the same time that the film is sandwiched by a roller for adhesion. The film layer of the copolyester that can be used in the present invention has high adhesiveness, so that the peelability from the roll is deteriorated, and as a result, the processability may be deteriorated. For this reason, at least the roll that is in contact with the membrane is coated with a releasable resin such as PTFE. V, that is, is matte!

[0038] When a non-woven fabric formed of a block copolymer polyester composed of a hard segment and a soft segment is laminated with a film composed of a block copolymer polyester composed of a similar chemical composition, the fiber diameter is 3 to 30 microns. Particularly preferred is between 5 and 18 microns. According to the inventor's experience, when the thickness of the membrane is thinner than 1Z2 which is the average fiber diameter, the membrane may be broken or peeled off from the fiber layer. On the other hand, when the fiber diameter is smaller than 3 microns, fluffing occurs during handling, and as a result, the peel strength tends to decrease.

[0039] As a result of the study by the present inventors, it is also recommended to improve the adhesion to a film or the like by subjecting the block copolymer polyester nonwoven fabric to corona treatment or the like, if necessary. In addition, the nonwoven fabric and film of the present invention can be mixed with appropriate antioxidants, weathering materials, lubricants, colorants and the like. In particular, when used for applications such as house wraps where sunlight is directly applied, in order to prevent deterioration due to ultraviolet rays, etc., a total amount of UV absorber, UV stabilizer, and antioxidant should be 0.1 to 15%. Is preferred.

[0040] In addition, the stretchable nonwoven fabric of the present invention is also preferably subjected to hydroentanglement force for one dollar punch force for the purpose of increasing fiber entanglement, bulkiness or flexibility. One of the

It is also possible to prevent fluff by increasing fiber adhesion with a binder such as greaves. Example

Next, the present invention will be described with specific examples.

The measuring method used in the present invention is as follows.

(Thickness) The thickness at 20 gZcm ² load was measured with a peacock thickness meter.

[0043] (Elongation at break and stress at 10% elongation)

Measurement was performed according to the procedure according to JIS L1096. A non-woven fabric was cut into a 5 cmxlOcm rectangle, and the load at 10% deformation was measured at an effective width of 5 cm, a gauge length of 2.5 cm, and a constant crosshead speed of lOcmZ. When measuring the elongation at break, the elongation until the tensile stress Sl decreased was measured. Even when a large deformation is applied to the sheet, it will be stretched at the same speed and immediately after being deformed to a preset maximum strain of 20% or more. The load was removed.

[0044] (Stress ratio at 10% elongation during first deformation and second deformation: fh)

Ten

Cut the non-woven fabric into a 5cmxl0cm rectangle, measure the load (fho) at 10% deformation when deformed by 20% at an effective width of 5cm, gauge length of 2.5cm and constant crosshead speed of lOcmZ (first deformation). Reverted deformation to 0%. The same material was stretched and deformed again, and the value (fhr) when the strain amount reached 10% was measured. The stress ratio was calculated by the following formula.

fh (%) = fhr / fho X 100

Ten

[0045] (20% elongation recovery rate) In accordance with JIS L 1096 B2 method, the distance between the marked lines after being left for 1 minute after extending 20% with respect to the distance L0 between the initial marked lines under no load. The distance L1 was measured. The residual strain rate was measured by the following formula.

20% growth recovery rate (%) = L1 ÷ L0 X 100

(Moisture permeability)

Measured according to JIS L1099 [4.1.1 (A-1 method) using calcium chloride, φ 70mm] (water pressure resistance)

Measurement was performed according to JIS L1092 [5.1 B method (high water pressure method)].

(Fiber diameter)

Photographs were taken at an appropriate magnification using an operation electron microscope, and about 20 to 200 fibers were randomly selected to measure the distance between the sides of each fiber. The fiber diameter was measured assuming a circular cross section in terms of the magnification.

[Example 1]

A non-woven fabric having a diameter of 14 microns and a basis weight of 42 Zm ² was prepared by the spunbond method at 215 ° C with a copolymerized polyester resin, perprene P40B (M FRlOgZlO content at 190 ° C, melting point 180 ° C) at 215 ° C. Subsequently, the fibers were bonded using a hot embossing roll at 150 ° C, and at the same time, the nonwoven fabric was processed so that the shrinkage ratio was 20%. Furthermore, after coating the entire surface of the nonwoven fabric surface with an acrylic resin in which skin color pigment is dispersed with a thickness of about 25 microns by offset gravure printing, the acrylic resin is coated by offset gravure printing. Sousse medium was coated to a thickness of about 18 microns. The basis weight of the nonwoven fabric was 53 gZm and a thickness of 0.35 mm. The elongation at break was 292%, and the 10% elongation stress after the first 20% elongation was as low as about 45% of the initial value before large deformation. The 20% growth recovery rate was 93%. When a 2cmxl0cm rectangular sheet with an acrylic adhesive layer is pasted on the elbow, move the hand after pasting or immediately pasting because there is a suitable waist.

However, it was found that it is suitable for use as a plaster base fabric or scratched tape that does not feel sticky.

(Example 2) Perprene resin GP550 manufactured by Toyobo Co., Ltd. (MFR34gZ for 10 minutes at 230 ° C, melting point: 174 ° C) C at an extrusion Ri by the T-die, at an offset of 15cm in example 1 of 53 g / m ² stretchable non

They were bonded together in contact with the woven fabric so as to have an average thickness of 20 microns. The film side of the obtained sheet was subjected to the same flesh-color printing and medium coating as in Example 1. The elongation at break was 264%, and the stress at 10% elongation after the first 20% elongation was as low as about 58% of the initial value. The 20% elongation recovery rate of the laminate was 93%, which was good. The moisture permeability is 2800g / m ² · 24Hr, which is excellent!

Example 3 A nonwoven fabric nonwoven fabric having a breaking elongation of 155% was prepared using MS7 (2.2 dtex), a polyester short fiber manufactured by Toyobo Co., Ltd. On one side, a solid urethane resin with 5% flesh-colored pigment added by gravure printing was printed with a 65% dot coverage. The elongation at break was 164%, and the 10% elongation stress after the initial 20% elongation was about 52% lower than the initial value. The 20% elongation recovery rate of the laminated product was 94%, and there was no particular problem. The nonwoven fabric had a suitable texture.

[0049] (Example 4)

In Example 1, the medium layer coating is a dot pattern and the area ratio is set to 50%. I went twice. The elongation at break was 249%, and the 10% elongation stress after the first 20% elongation was about 41% of the initial value, which was even lower than Example 1. The 20% elongation recovery rate of the laminated product was 90%, and the problem was strong. [0050] (Comparative Example 1)

In Example 1, surface printing was carried out without any effort. The breaking elongation was 330%, and the 20% elongation recovery rate was 91%. After the initial 20% elongation, the stress at 10% elongation was almost the same as the initial value of about 99%. When a 2cmxl0cm rectangular sheet with an acrylic adhesive layer is attached to the elbow, it is estimated that there is no tension even if the hand is applied after the application, and it can be used as a plaster base fabric or scratched tape. Because the nonwoven fabric was too soft, it was difficult to apply curl and wrinkles that were presumed to be caused by static electricity.

[0051] (Comparative Example 2)

In the production of the nonwoven fabric of Example 1, the fiber diameter was changed to 27 microns, and the basis weight was changed to 250 g / m ² . The thickness of the obtained nonwoven fabric was 1.3 mm. Subsequently, using a hot embossing roll at 150 ° C, the nonwoven fabric was shrunk so that the shrinkage was about 4%, but no coating was performed. The nonwoven fabric weight after processing was 263 g / m ² and the thickness was 1.4 mm.

. The elongation at break was 181%, the 20% elongation recovery rate was 90%. The stress at 10% elongation after the initial 20% elongation was about 98% of the initial value, which was almost the same. The texture of the nonwoven fabric was too hard to be used as a patch. The feel of the seat was also rubber-like and felt very good.

[0052] (Comparative Example 3)

In the same manner as in Example 1, a medium-based coating agent was printed on the nonwoven fabric used in Comparative Example 2 over the entire surface of the nonwoven fabric so as to have a thickness of about 360 microns, which is about 1Z2 in thickness. The elongation at break was 148%, the 20% elongation recovery rate was 82%. The stress at 10% elongation after the first 20% elongation was about 88% of the initial value, but the difference was small. The texture was too hard, and when used as a patch, a feeling of tension was felt.

Industrial applicability

[0053] The stretchable sheet that can be used in the present invention is a product that is easy to handle because it has a certain level of elasticity in the initial stage, is excellent in stretchability and stretch recovery, is softer and has better followability. A wide range of uses such as clothing, patches, bandages, etc. It can be used in the field and contributes greatly to the industry.

Claims

The scope of the claims

[1] A sheet having a basis weight of 20 to 200 gZm ² and having a breaking elongation of 10 in at least one direction

Tensile stress at 10% elongation when the deformation load is removed after the first large deformation (first deformation) of 20% or more and the deformation load is removed for the first time (second deformation) is ( An elastic sheet characterized by being 3% or more and 85% or less of the initial value before (first deformation).

[2] The stretchable sheet according to claim 1, wherein the surface of the sheet is coated with a resin having an area ratio of 3 to L00%.

[3] The stretchable sheet according to claim 1 or 2, further comprising at least one layer of a nonwoven fabric having a fiber diameter of 3 to 50 microns and a volume filling ratio of 5 to 30%.

[4] The main raw material is a block copolymerized polyester resin, a polyurethane resin, a polyolefin resin, or a polyamide resin comprising a hard segment and a soft segment. 4. The elastic sheet according to any one of 3.

[5] The stretchable sheet according to claims 1 to 3 is a non-woven fabric, and the thickness of one side of the non-woven fabric is 5 to: L0

A stretchable sheet comprising a laminate of 0 micron stretchable films.

[6] A patch comprising an aqueous or solvent-based drug or a gel-like layer on one side of the sheet according to any one of claims 1 to 5.

[7] Is a block copolymer polyester composed of hard and soft segments, or a long fiber nonwoven fabric with a fiber diameter of 3 to 50 microns made of any force of polyurethane, polyolefin, or polyamide, or an extruded film made of the same material. After shrinkage treatment at 200 ° C for 5-80%, printing materials containing pigments or materials with different elongation, such as medium, are printed at 0.1 to 5 g / m ^{2 on} at least one side of the nonwoven fabric. A method for producing an elastic sheet.