WO2006009031A1

WO2006009031A1 - Stretch nonwoven fabric and laminated stretch nonwoven fabric

Info

Publication number: WO2006009031A1
Application number: PCT/JP2005/012908
Authority: WO
Inventors: Shigeki Tanaka; Masataka Adachi
Original assignee: Toyo Boseki Kabushiki Kaisha
Priority date: 2004-07-20
Filing date: 2005-07-13
Publication date: 2006-01-26
Also published as: JP2006028695A

Abstract

[PROBLEMS] To provide a stretch nonwoven fabric which is so excellent in moisture permeability to bring about little sweatiness and little suffers fluffing by virtue of its surface smoothness and which little causes peeling-off by virtue of its proper stretching property to follow the expansion and contraction of the skin surface and is favorably usable as fabric backing of the sheets or tapes to be applied to the skin. [MEANS FOR SOLVING PROBLEMS] A stretch nonwoven fabric consisting of partially thermocompression-bonded thermoplastic elastomer fibers, characterized in that at least one outermost surface layer of the fabric is partially coated with a resin and the fabric has an apparent density of 0.15g/cm3 or above, an air permeability of 200cm3/cm2?sec or below, a moisture permeability of 8000g/m2?24h or above, an elongation in one direction of 100% or above, and a 20% elongation recovery of 80% or above.

Description

Specification

Elastic nonwoven fabric and elastic composite nonwoven fabric

Technical field

[0001] The present invention relates to a stretchable nonwoven fabric. Sarasuko is a sheet that adheres to or coats the skin surface that has excellent moisture permeability, makes it difficult to slip and makes it difficult to fluff, and has moderate elasticity that can follow the expansion and contraction of the skin surface. The present invention relates to a stretchable nonwoven fabric that is optimal for a tape base fabric.

Background art

[0002] In order to impart stretchability to a sheet or tape base fabric to be applied to the skin surface, a non-woven fabric using fibers made of thermoplastic cocoon resin has been proposed. For example, urethane fiber nonwoven fabrics by the melt blow method have been proposed (see, for example, Patent Document 1 and Patent Document 2). However, non-woven fabrics that also have urethane fiber strength are inferior in smoothness and fuzzy. Further, when a medicated plaster or the like is applied, there is a problem that bleeding is large. Melt blown non-woven fabrics composed of a butyl aromatic conjugated Jen compound and olefin have been proposed for the purpose of improving the light resistance, chemical resistance and heat resistance, which are the disadvantages of urethane (see, for example, Patent Document 3). ) However, the problem of significant fuzz has not been solved.

Patent Document 1: JP 59-223347

Patent Document 2: Japanese Patent Laid-Open No. 01-132858

Patent Document 3: Japanese Patent Laid-Open No. 02-259151

[0003] For this reason, various proposals have been made to use thermoplastic elastic resin in a film as a method for preventing fuzz. For example, a method using a urethane resin film has been proposed (see, for example, Patent Document 4). However, this method has poor moisture permeability, and also has the problem of oozing out of chemicals due to urethane.

There have been many proposals for a laminated structure of a film and a nonwoven fabric. For example, a laminate of a fiber nonwoven fabric and a urethane film (for example, see Patent Document 5), a laminate structure of a fiber nonwoven fabric and urethane or a thermoplastic rubber-based film (for example, see Patent Document 6), and a fiber structure that emphasizes stretchability. The woven fabric is also made of thermoplastic elastic resin, and the film is also made of thermoplastic elastic resin. A layer structure has also been proposed.

[0005] Furthermore, a laminate of a urethane fiber nonwoven fabric and a urethane film (for example, Patent Document 7), a laminate structure of a nonwoven fabric and a film that also becomes a polyamide elastomer (for example, Patent Document 8), and a polyester elastomer. Laminated structure of non-woven fabric and film (for example, patent literature)

9), laminated structures with various films (for example, Patent Document 10, Patent Document 11, Patent Document 12)

Patent Document 13, Patent Document 14, etc.) have been proposed. Thus, the laminated structure with these films is excellent in smoothness and eliminates fuzz, but has insufficient moisture permeability and does not eliminate stuffiness.

Patent Document 4: Japanese Patent Laid-Open No. 02-270818

Patent Document 5: Japanese Patent Laid-Open No. 05-271077

Patent Document 6: Japanese Patent Laid-Open No. 07-309748

Patent Document 7: Japanese Patent Application Laid-Open No. 08-10283

Patent Document 8: Japanese Unexamined Patent Publication No. 2003-181995

Patent Document 9: Japanese Unexamined Patent Publication No. 2003-171861

Patent Document 10: Japanese Unexamined Patent Publication No. 2000-158593

Patent Document 11: Japanese Patent Laid-Open No. 2001-105520

Patent Document 12: Japanese Patent Laid-Open No. 2001-348766

Patent Document 13: JP 2002-96432 A

Patent Document 14: Japanese Patent Application Laid-Open No. 2002-178427

[0006] As described above, in the conventional technique, since the surface that is excellent in moisture permeability and slippery is easy to slip, it is difficult to fluff and has the appropriate elasticity that can follow the expansion and contraction of the skin surface. There is no satisfactory stretchable nonwoven fabric suitable for the base fabric of sheets or tapes to be applied to the skin surface.

Disclosure of the invention

Problems to be solved by the invention

[0007] The present invention has been made against the background of the problems of the prior art, and since the surface that is excellent in moisture permeability and difficult to simmer is slippery, it is difficult to fluff and has appropriate elasticity that can follow the expansion and contraction of the skin surface and is difficult to peel off. Sheet or tape to be applied to the skin surface that can satisfy all requirements It proposes the most suitable stretch nonwoven fabric for the base fabric.

Means for solving the problem

[0008] As a result of diligent research to solve the above-mentioned problems, the inventors of the present invention have developed a dense structure in order to impart the necessary strength to a fiber nonwoven fabric imparted with thermoplastic elastic resin. Even so, it has been found that adding a moisture absorbing / releasing material to the nonwoven fabric surface can solve the fuzziness and provide excellent moisture permeability, and the present invention has been completed. That is, the present invention is (A) a non-woven fabric made of a thermoplastic elastomer fiber partly thermocompression-bonded (embossed), and at least a part of the outermost layer of the non-woven fabric is coated with a resin. an apparent density 0. 15gZcm ³ or more, air permeability 200cm ³ Zcm ² 'sec or less, moisture permeability 8000gZ m ^2' and at 24h or more, one direction elongation greater than 100% and a 20% elongation recovery rate of 80 A stretchable nonwoven fabric characterized by being at least%. (B) The stretchable nonwoven fabric according to (A), which contains moisture absorbing / releasing fine particles in an amount of 0.01 to 10% by weight. (C) The elastic nonwoven fabric according to any one of (A) to (B), wherein the thermoplastic elastomer fiber is a polyester elastomer fiber. (D) The stretchable nonwoven fabric according to any one of (A) to (C), wherein the nonwoven fabric has a load at 100% elongation of 1.4 times or more of a load at 50% elongation. (E) A stretchable nonwoven fabric in which the fibers constituting the stretchable nonwoven fabric described in (A) to (D) also have an original fiber strength composed of cocoon resin in which colored fine particles such as pigments are kneaded into a thermoplastic elastomer. . (F) A stretchable nonwoven fabric described in (A) to (E) is extruded and laminated with a film having a thickness of 5 to: L00 m made of a block copolymer polyester having a melting point of 150 to 230 ° C. Elastic composite nonwoven fabric. (G) A base fabric for sticking characterized by using the stretchable nonwoven fabric or stretchable composite nonwoven fabric described in (A) to (F).

The invention's effect

[0009] The stretchable nonwoven fabric of the present invention absorbs the nonwoven fabric surface even if it has a dense structure in order to impart the necessary strength to the fiber nonwoven fabric imparted with a thermoplastic elastic resin. By adding a moisture-releasing substance, it was possible to solve the fuzziness and provide excellent moisture permeability. In addition, it has moderate elasticity that can follow the expansion and contraction of the skin surface and is difficult to peel off. Elasticity ideal for tape fabrics A nonwoven fabric can be provided.

Furthermore, for house wrap applications that require water resistance, a base fabric that satisfies both excellent moisture permeability and water resistance at the same time can be provided by providing a laminate strength with the film.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail.

The present invention is a non-woven fabric made of a thermoplastic elastomer fiber fiber partially thermocompression-bonded, wherein at least a part of the outermost layer of one surface of the non-woven fabric is coated with a resin, and the apparent density is 0.15 gZcm ³ or more. Stretch characterized by air permeability of 200cm ³ Zcm ² 'sec or less, moisture permeability of 8000gZm ² ' 24h or more, unidirectional elongation of 100% or more and 20% elongation recovery rate of 80% or more A non-woven fabric.

In the present invention, the thermoplastic elastomer refers to a thermoplastic resin having thermoplasticity and rubber elasticity. For example, an olefin elastomer, a polyester elastomer, a urethane elastomer, and a styrene elastomer. Examples thereof include polyamide elastomers, butadiene elastomers, fluorine elastomers, copolymers and mixtures thereof, and compositions containing a thermoplastic non-elastomer.

[0012] A preferred thermoplastic elastomer in the present invention is a polyether glycol, polyester glycol, polycarbonate glycol having a molecular weight of 300 to 5000 as a soft segment, or a long-chain hydrocarbon terminal is a carboxylic acid or a hydroxyl group. Examples thereof include polyester elastomers obtained by block copolymerization of polyolefin compounds, polyamide elastomers, polyurethane elastomers, polyolefin elastomers, and the like.

[0013] By using a thermoplastic cocoon resin, it becomes possible to regenerate by remelting, so that recycling becomes easy. For example, polyester-based elastomers include polyester ether block copolymers with thermoplastic polyester as the node segment and polyalkylene diol as the soft segment, or polyester ester block copolymers with aliphatic polyester as the soft segment. It can be illustrated. More specific examples of polyester ether block copolymers include aromatic dicarbons such as terephthalic acid, isophthalic acid, naphthalene 2/6 dicarboxylic acid, naphthalene 2/7 dicarboxylic acid, diphenyl 4/4 'dicarboxylic acid, etc. Acid, alicyclic dicarboxylic acid such as 1/4 cyclohexanedicarboxylic acid, oxalic acid, adipine Acid, aliphatic dicarboxylic acids such as sebacic acid dimer acid, or ester-forming derivatives of these, at least one selected dicarboxylic acid, and 1,4 butanediol, ethylene glycol, trimethylene glycol, Formation of aliphatic diols such as tetremethylene glycol, pentamethylene glycol, hexamethylene glycol, alicyclic diols such as 1 · 1 cyclohexane dimethanol, 1 · 4 cyclohexane dimethanol, or esters thereof At least one diol component selected from functional derivatives, and polyalkylenes such as glycols comprising polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene oxide propylene oxide copolymer having an average molecular weight of about 300 to 5000 At least of the diol Is a ternary block copolymer composed of one kind of force.

[0014] The polyester ester block copolymer includes a ternary block copolymer consisting of at least one of the dicarboxylic acid, diol, and polyester diol such as polylatatatone having an average molecular weight of about 300 to 5,000. It is a coalescence. Considering thermal adhesiveness, hydrolysis resistance, stretchability, heat resistance, etc., dicarboxylic acid is terephthalic acid or naphthalene 2/6 dicarboxylic acid, diol component is 1,4 butanediol, polyalkylene The diol is particularly preferably a polytetramethylene glycol ternary block copolymer or a polylatatane terpolymer block copolymer as a polyester diol. In a special case, a polysiloxane-based soft segment can also be used. The thermoplastic elastomer blended with the present invention includes those obtained by blending the above-mentioned elastomer with a non-elastomeric component, those copolymerized, and those having a polyolefin segment as a soft segment.

[0015] Polyamide elastomers are generally made of nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, etc. and their copolymer nylon in the hard segment, and average in the soft segment. At least one kind of polyalkylene diols such as polyethylene glycol having a molecular weight of about 300 to 5000, polypropylene glycol, polytetramethylene glycol, and ethyleneoxy-doped propylene oxide copolymer. You may use the block copolymer comprised individually or in mixture of 2 or more types. Furthermore, blended or copolymerized non-elastomer components are also used in the present invention. it can. Polyurethane elastomers include (A) a polyether and / or polyester having a hydroxyl group at the terminal with a number average molecular weight of 1000 to 6000 in the presence or absence of a normal solvent (dimethylformamide, dimethylacetamide, etc.) and (B) A typical example is (C) a polyurethane elastomer chain-extended with a polyamine containing diamine as a main component in a prepolymer that is a double-end force S-isocyanate group reacted with a polyisocyanate containing organic diisocyanate as a main component. It can be illustrated. Polyester (A), polyether - as the ethers, the average molecular weight force ^s about 1000 to 6000, preferably <a positive butylene adipate Bokutomo-polyester and polyethylene glycol 1300-5000, polypropylene glycol, Poritetoramechi glycol, Polyalkylene diols such as glycols made of ethylene oxide propylene oxide copolymer are preferred (B) As the polyisocyanate (B), a conventionally known polyisocyanate can be used. Diphenylmethane 4.4 , Diisocyanate is mainly used, and if necessary, a conventionally known triisocyanate or the like may be added in a small amount.

[0016] As the polyamine (C), known diamines such as ethylene diamine and 1/2 propylene diamine are mainly used, and a small amount of triamine and tetraamine may be used in combination as required. These polyurethane elastomers may be used alone or in combination of two or more. In addition, if necessary, it can be used as an original coffin resin colored by adding colored fine particles. Further, durability can be improved by adding an antioxidant or a light-resistant agent. Most preferably, it is a composition that passes the voluntary standards for food containers made of synthetic resin such as polyolefin for use in contact with the skin.

[0017] The stretchable nonwoven fabric of the present invention is a partially thermocompressed nonwoven fabric composed of the above-mentioned fibers made of thermoplastic elastomer, and at least a part of the outermost layer on one side of the nonwoven fabric is a resin. Coated with an apparent density of 0.15 g / cm ³ or more, air permeability of 200 cm ³ / cm ² 'sec or less, moisture permeability of 8000 gZm ² '24 h or more, and unidirectional elongation of 100% or more and 20% It is necessary to satisfy all the requirements that the elongation recovery rate is 80% or more.

[0018] The nonwoven fabric of the present invention needs to be partially thermocompressed in order to join and integrate the fibers constituting the nonwoven fabric to give the strength and shape retention necessary for stretchability. The form of the thermocompression bonding (emboss) pattern is not particularly limited, but the form and thermocompression bonding can be performed according to various requirements. It is preferable to select the area. For example, a crimp area ratio of 5% to 60% can be selected for shapes such as a square convex pattern, a lattice convex pattern, a turtle shell pattern, a diagonal lattice pattern, a dial pattern, a horizontal ellipse pattern, and a texture pattern. In order to obtain a noreki structure, it is preferable to reduce the thermocompression bonding area ratio to 5% to 15%. When strength is required, the crimping area ratio is preferably increased to 20% to 60%. In special cases, the thermocompression bonding part can be a through hole. The embossing temperature should be below the melting point depending on the material. For example, polyester with a melting point of 180 ° C is 130 ° C to 140 ° C, and the crimping line pressure is 5kNZn! ~ 200kNZm can be selected.

[0019] The stretchable nonwoven fabric of the present invention is required to have at least one outermost layer coated with a resin so that the surface is slippery and the fibers are prevented from being pulled out by being caught to prevent fluffing. The outermost surface as referred to in the present invention is a surface that has been crushed by embossing and is raised, and at least a part of the outermost surface needs to be coated with a resin. If the surface layer is not coated with a resin, it is not preferable because the surface slippage is poor and the fibers are easily fuzzed. Further, it is not preferable because the fiber can be easily pulled out by being caught and the base fabric may be broken. In the present invention, for example, to coat the outermost layer only, there is a method of coating the resin by Daravia printing or offset printing. To coat the resin to the inner layer, flexographic printing may be used. Can be used. If necessary, coat both sides with grease. Furthermore, in order to coat the resin to the inner layer, the resin can be impregnated by applying the resin by a dip method, a spray method, foam processing or the like.

A preferred resin coat of the present invention is flexographic printing in which the resin layer can be processed to the inner surface of the surface layer so that the surface layer can be firmly fixed and an aqueous resin dispersion can be used.

[0020] As the coating resin, urethane-based, acrylic-based, polyester-based and mixed systems thereof can be used. It is preferable to use a resin having elasticity in a range that does not inhibit smoothness. The amount of sachet applied is preferably 0.1 lg / m ² to: LOg / m ^{2 on} one side for printing (twice on both sides), and the amount can be changed as required. If it is less than 0.lgZm ² , the effect of preventing fuzzing may be insufficient. It is necessary to set an appropriate amount that does not hinder stretchability. The apparent density in the present invention is a value obtained from the mass per unit area and the thickness obtained according to JIS L-1906 (2000). In the present invention, an apparent density of 0.15 g / cm ³ or more is required. If the apparent density is less than 0.15 g / cm ³ , Unsatisfactory strength causes undesired breakage during elongation. Preferred Apparent only density of the present invention is 0. A 18gZcm ^³ ~0. 50gZcm ^3, more preferably ^{0. 20gZcm 3 ~0. 45g / cm} 3. If the apparent density exceeds 0.50 g / cm ³ , the air permeability and moisture permeability may deteriorate, which may be preferable.

The air permeability in the present invention is a value determined in accordance with JIS L 1906 (2000) Frazier method. In the present invention, the air permeability of the stretchable nonwoven fabric is 200 cm ³ / cm ² ′ sec or less. If the air permeability exceeds 200 cm ³ / cm ² ′ sec, the skin covering performance may be deteriorated due to aeration, which is not preferable. The preferred air permeability of the present invention is 150 cm ³ / cm ² 'sec or less, more preferably 1 OOcm / cm 2 sec or less.

The moisture permeability in the present invention is a value determined by the JIS L 1099 (1993) calcium chloride method. In the present invention, the moisture permeability needs to be 8000 gZm ² '24h or more. Since the moisture permeability is so high, water vapor on the skin surface is released to the outside of the non-woven fabric, and it is difficult to feel stuffiness even when applied to the skin surface. Less than 8000gZm ² '24h is not preferable because stuffiness is not eliminated.

Preferably lOOOOgZm ² · 241! ~ 25000gZm ² · 24h, more preferably 12000g / m ² · 2 41! ~ 20000gZm ² '24h. If it is 25000gZm ² '24h or more, the hydrophilic property may be extremely poor, which may be preferable.

The elongation percentage of the nonwoven fabric in the present invention is a value measured by a method based on JIS L-1906.

[0022] In addition, the elongation recovery rate is the elongation when stretched to 20%, immediately recovered to 0%, and stretched to break again in accordance with the elongation measurement method of JIS L-1906. The value obtained by subtracting 20% from the value obtained by subtracting the relaxation strain (εi) from 20% when it is stretched again after 20% stretch recovery of the recovery elongation load curve. The one direction in the present invention means one of the vertical direction (hereinafter abbreviated as MD direction) and the horizontal direction (hereinafter abbreviated as CD direction). If there is no description, the MD direction is assumed. The nonwoven fabric of the present invention has an elongation rate in at least one direction of 100% or more and a 20% elongation recovery rate of 80% or more. An elongation of less than 100% is not preferable because it cannot follow the expansion and contraction of the skin surface. The preferable elongation is 120% to 500%, more preferably 150% to 450%. If the elongation rate is 500% or more, even if the elongation recovery rate is 80% or more, if the elongation exceeds 200%, sagging may occur and cause turning Is not preferable. When the 20% elongation recovery rate is less than 80%, it is not preferable because it can not follow the expansion and contraction of the skin surface to give a favorable fit and also causes sagging, which can cause turning. The preferable 20% elongation recovery rate is 85% or more, more preferably 90% to 100%. In the present invention, the elongation rate and elongation recovery rate in other directions are not particularly limited, but preferably, the elongation rate is 50% or more and the elongation recovery rate is within the range in which the followability to the stretchability of the skin is good. 50% or more. More preferably, the elongation rate is 100% or more and less than 500%, and the elongation recovery rate is 80% or more.

The elongation load of the nonwoven fabric of the present invention is not particularly limited. However, when the 100% elongation load of the nonwoven fabric is at least 1.4 times the 50% elongation load, the elongation rate is less than 50%. Since the load following the expansion and contraction of the skin surface can be reduced, the pressure on the skin surface can be reduced, which is a preferred embodiment.

[0023] The nonwoven fabric of the present invention is provided with moisture-absorbing / releasing fine particles, from the inside (skin surface) to the outside via the moisture-releasing / releasing particles (from the surface of the sheet or tape attached to the skin surface to the atmosphere) This is a preferred embodiment because it allows continuous release of moisture and enhances moisture permeability.

If moisture-absorbing fine particles that do not have moisture release properties are applied, the moisture-absorbing fine particles absorb moisture sufficiently and saturate, and the moisture absorption fine particles become moisture barriers and no moisture moves from the inside (skin surface). Is not preferable because of rapid progress.

[0024] The preferred moisture-absorbing / releasing fine particles used in the present invention include, for example, a crosslinked structure introduced into acryl resin containing 85% or more of allyl-tolyl by hydrazine treatment, and having a nitrogen content. Examples include those having an increase of 1 to 15% by weight and remaining by hydrolysis, and having a particle size of 5 μm or less in which the amount of ru-tolyl group of ImmolZg or more is chemically changed to a salt-based carboxy group. If the particle size is larger than the fiber diameter, it will be difficult to bond to the fiber surface, and it will be easy to fall off even if bonded, so the particle size is fine! Fine fine particles can be imparted and bonded to the surface by, for example, a method of mixing moisture absorbing / releasing fine particles with the ink component and printing on the nonwoven fabric surface when performing gravure printing to improve surface slippage and fluff. it can. The preferred particle size of the moisture-absorbing / releasing fine particles applied to the nonwoven fabric surface in the present invention is 5 μm or less, more preferably 1 μm or less. Non-woven fabric that gives moisture-absorbing and releasing fine particles, when applied to the surface in the air opposite to the skin surface, Even when the air permeability is very low, the moisture absorption function of the moisture absorbing / releasing fine particles functions forcibly even through the air permeability low barrier, and this is a preferred embodiment because the moisture releasing efficiency is further improved. In the case of a nonwoven fabric having a remarkably low air permeability, it is preferable to increase the amount of moisture-absorbing / releasing moisture particles applied to the nonwoven fabric in order to sufficiently impart moisture absorption / release properties. Preferred embodiment in the present invention In the embodiment, the amount of moisture absorbing / releasing fine particles applied to the nonwoven fabric is preferably 0.01 wt% to 10 wt%. More preferably, it is 0.10 wt% to 5 wt%. If the amount is less than 01% by weight, the moisture absorption / release property may be insufficient. If the amount is 10% by weight or more, the excessive application effect may not be an effective use of the function, which may be preferable.

[0025] The composition of the fibers constituting the nonwoven fabric of the present invention is not particularly limited as long as it is one of the above-mentioned thermoplastic elastomers, but a polyester elastomer that does not easily cause exudation of drugs or the like is particularly preferred. This is an embodiment.

The fineness of the fibers constituting the nonwoven fabric of the present invention is not particularly limited, but it is desirable to set the fineness suitable for the desired structure according to each application. For example, for a dense structure, 0.2 dtex to 3 dtex is preferable, and for a slightly rough structure, 3 dtex to 6 dtex is preferable. Furthermore, for a rough structure, 6 dtex to 20 dtex. Is preferred.

The cross-sectional shape of the fibers constituting the nonwoven fabric of the present invention is not particularly limited, but if it is thinner and requires strong and stretchable properties in a specific direction, it is preferable to use a flat cross-section, which is extremely bulky. When required, measures such as a modified hollow cross section are preferable, but a round cross section is usually a preferable cross section with little difficulty during manufacture.

[0026] The arrangement of the fibers constituting the nonwoven fabric of the present invention is not particularly limited, but it is preferable to have a desired arrangement according to each application. For example, when stretch recovery is particularly required only in the vertical direction, a random arrangement is preferable when stretchability is required in both the vertical and horizontal directions, which is preferable to a somewhat random orthogonal arrangement.

Basis weight of the present invention the nonwoven fabric is not particularly limited, in the case of thin request, the 30gZm ^² ~8 OgZm ² is preferably tool in basis weight required product, 80gZm ^² ~200gZm ^2, the thickness basis weight required product 200gZm ^² ~ 1 OOOgZm ² It is preferable to set in the range! /.

[0027] The stretchable nonwoven fabric of the present invention can be used as a film laminate structure by lamination with a thermoplastic elastomer when waterproofness is required. For example, polyester By stretching and extruding a stretchable non-woven fabric that is also an elastomeric elastomer and a polyester elastomer, for example, a polyester polyether copolymer, a laminated product with a film having a thickness of 5 μm to 100 μm is obtained. A stretchable nonwoven fabric having wettability can be obtained.

[0028] An example of a method for producing the nonwoven fabric of the present invention is shown below.

The nonwoven fabric of the present invention can be produced by controlling the expression of rubber elasticity in accordance with a known spinning method such as a spun bond method or a melt blow method. In the known spunbond method, spinning is performed at a temperature 10 ° C to 20 ° C higher than the melting point of the extruded polymer, and the sheet is formed by pulling it down from 4000 mZ min to 600 OmZ min. In the present invention, a thermoplastic elastomer is used. The fiber is spun at a temperature 15 ° C to 25 ° C higher than the melting point of the fiber to ensure that the web has an elongation of 250% to 350%, and is cooled sufficiently to prevent fusion, and the fiber returns due to rubber elasticity recovery. To prevent this, the web is formed into a sheet by swinging it down to the lower take-up net while taking it up at a speed of 500mZ to 2000mZ with the ejector. Subsequently, it can be thermocompression-bonded with an embossing roller and wound up into a stretchable nonwoven fabric. The pattern of the embossing roll can be used as a most preferred embodiment of the present invention for a grease ink for surface coating of a gravure printing for fluffing, coloring and smoothing of moisture absorbing / releasing fine particles on a nonwoven fabric surface. A stretchable nonwoven fabric that is mixed and dispersed and applied to the surface of the nonwoven fabric to which moisture-absorbing and releasing fine particles are fixed simultaneously with printing is obtained.

[0029] In the known melt-blowing method, the spinning temperature is extruded at a normal temperature, and the sheet is formed by shaking while pulling along with a super high-speed air flow exceeding 10,000 m / min at a high temperature exceeding 300 ° C. In the invention, the traction airflow temperature (less than 300 ° C) and speed (less than 8000mZ) are set low, shaken onto the net surface just before solidification, and sucked and attached to the net surface to give a bow by rubber elasticity. An elastic nonwoven fabric is obtained by winding it by embossing while preventing spasm. As the most preferred embodiment of the present invention, the surface of the nonwoven fabric is obtained by mixing and dispersing moisture absorbing / releasing fine particles on the surface of the stretchable nonwoven fabric in a fluffy ink for surface coating for gravure printing, coloring and smoothing. A stretchable nonwoven fabric in which moisture absorbing / releasing fine particles are fixed at the same time as printing is obtained.

[0030] The stretchable nonwoven fabric of the present invention obtained by caulking has excellent moisture permeability by solving fuzziness Medical treatment that is applied to or covered on the skin surface, such as bandages, pops, plasters, pantages, bandages, taping, supporters, etc. It is possible to provide a stretchable nonwoven fabric that is most suitable for the base fabric of adhesive sheets for medical use or medical adhesive tapes.

Furthermore, for house wrap applications that require water resistance, by laminating, for example,

A base fabric that simultaneously satisfies excellent moisture permeability and water resistance can be provided by laminating and extrusion with a polyester polyether copolymer to form a laminated product with a film having a thickness of 5 μm to 100 μm. .

In addition, the illustration in this invention is not limited to these.

[0031] Examples of the present invention will be described below. The present invention is not limited to the examples.

Example

Next, the present invention will be specifically described with reference to examples and comparative examples. Sensory evaluation by a wearing test was measured and evaluated by the following methods.

100 μm acrylic adhesive is coated on the opposite side of the non-woven fabric coated stretch nonwoven fabric coated on one side with 100 μm, and 50 μm on the opposite side of the nonwoven fabric. Was laminated to create an adhesive sheet. This pressure-sensitive adhesive sheet was punched into 2 Ocm in the MD direction and 10 cm in the CD direction as a sample for application. The sample for pasting is to have 5 panelists put them on the surfaces of both knees and elbows, wearing long trousers and long-sleeved acrylic training wear, and running at an indoor temperature of 25 ° C and an indoor humidity of 65% RH. The following evaluation was performed 5 minutes after running for 2 hours with knees and elbows bent at a relative speed of lOkmZ on a machine.

[0033] (Dampness)

The degree of stuffiness on the affixed surface. I don't feel stuffy: 5, I feel a little stuffy, but I don't care: 4, I feel a little stuffy: 3, I feel a little stuffy: 2, I feel very stuffy: Evaluate with 1 and judge by the average of 5 people did.

[0034] (Following)

The degree of resistance on the pasting surface was judged by the panelist's feeling. No resistance when flexing: 5, feel some resistance when flexing, but don't mind: 4, feel a little resistance when flexing: 3, flexion I feel a little resistance to resistance: 2, I feel very resistance to flexion: I rated it as 1, and judged it as the average of 5 people.

(Fuzziness)

Judged from the occurrence of fluff on the surface of the four samples after wearing. No fuzz generation: 5, Fuzz generation almost never: 4, Fuzz generation slightly: 3, Fuzz generation slightly: 2, Fuzz generation Large: Judged by 1 and determined by the average of 5 people.

(Peeling)

The peel strength of the 4 pasted samples after wearing was judged. No peeling: 5, Slightly peeled (only 1 place): 4, Slightly peeled (within 3 places): 3, Slightly peeled: 2, Peeled (4 places): 1 And we judged by average value of five people.

[0035] Examples 1, 2, 3, Comparative Examples 1, 2, 3, 4,

As a polyester elastomer, dimethyl terephthalate (DMT) and 1/4 butanediol (1'4BD) are charged with a small amount of catalyst, and after transesterification by a conventional method, polytetramethylene glycol (PTMG) is added. Polyester ester block copolymer elastomer is formed by polycondensation while heating and reducing the pressure, and after adding 1% of antioxidant in the next step, kneading and mixing, pelletizing, and vacuum drying at 50 ° C for 48 hours. Table 1 shows the formulation of the thermoplastic elastomer raw material obtained.

[0036] [Table 1]

[0037] As a polyurethane elastomer, 4.4 'diphenylmethane diisocyanate (MDI), PTMG and 1'4BD as a chain extender are added and polymerized, and then dried in a vacuum and dried into a polyester. Tellurium urethane was used as the thermoplastic elastomer (A-3) raw material. The resulting thermoplastic elastomer had a melting point of 152 ° C. and a PTMG content of 64%.

[0038] (Example 1) Using A-1 as the resulting thermoplastic elastomer, discharging at a spinning temperature of 200 ° C, discharging at a single hole discharge of 0.5 gZ, and pulling it with an ejector at lOOOmZ nets on shaken off so that 50GZm ^2, holds the web forms the web is transferred fixed taking at pressing roller in the sheet by suction, and then the temperature 110 ° C, crimped area 20 weave pattern Stretch nonwoven fabric embossed with a linear pressure of lOOkNZm with an embossed roller of 100%, and then an aqueous dispersion of acrylic resin and skin-colored pigment with hygroscopic fine particles with an average diameter of 5 μm the Tafuchikku HU manufactured by Toyobo Co., Ltd. is dispersed in a water-based dispersion at a flexographic printing method, the Enbosuka卩工surface was wound by applying榭脂amount 5GZm ² and moisture-absorbing and desorbing fine particles 2gZm ^2. Table 2 shows the evaluation results of the resulting elastic nonwoven fabric. Example 1 satisfies all the requirements of the present invention, shows an excellent feeling of wearing, and exhibits the stretchable nonwoven fabric properties that are optimal for the base fabric of a sheet or tape to be applied to or coated on the skin surface.

[0039] [Table 2]

[0040] (Example 2)

Table 2 shows the evaluation results of the stretchable nonwoven fabric obtained in the same manner as in Example 1 except that 2-2 was used as the thermoplastic elastomer and the spinning temperature was 220 ° C and the embossing temperature was 130 ° C. In addition, The skin-colored resin coat is not applied to the pressure-bonded surface by embossing. Example 2 satisfies all the requirements of the present invention and exhibits an excellent feeling of wear, and shows the stretchable nonwoven fabric properties that are optimal for the base fabric of a sheet or tape that is applied to or coated on the skin surface.

[0041] (Comparative Example 1)

Using A-3 as the thermoplastic elastomer, discharge at a spinning temperature of 200 ° C at a single hole discharge rate of 0.5gZ, and pull it on the take-off net while pulling at 1300mZ by the ejector. Shake down to OgZm ² and hold the web shape in the form of a sheet by suction.The web is fixedly picked up and transferred by a single presser, then embossed at a temperature of 120 ° C and a textured pattern with a 65% crimp area. Table 2 shows the evaluation results of the stretch nonwoven fabric obtained by rolling with a roller and embossing at a linear pressure of 50 kNZm. Comparative Example 1 does not have the outermost resin coating required by the present invention and has poor moisture permeability, so that it is inferior in wearing feeling, and is not suitable for a base fabric of a sheet or tape to be applied to or coated on the skin surface. Nonwoven properties are shown.

[0042] (Comparative Example 2)

A-2 is used as the thermoplastic elastomer, and it is discharged at a spinning temperature of 280 ° C and a single-hole discharge of 0.4gZ, and at a traction fluid temperature of 350 ° C, being pulled at 8500mZ for a semi-molten state. The melt blown nonwoven fabric was blown onto the take-up net so as to be 50 gZm ² , held in a sheet form by suction, and the melt blown sheet was fixedly taken and transferred by a press roller, and then wound up. Aqueous dispersion of acrylic resin and skin-colored pigment and Tufic HU manufactured by Toyobo Co., Ltd., which are hygroscopic fine particles with an average diameter of 5 μm, are dispersed in the aqueous dispersion and sprayed on one side. It was wound up with 5 gZm ² of sallow and 0. lgZm ^{2 of} hygroscopic fine particles. Table 2 shows the evaluation results of the resulting stretchable nonwoven fabric. In Comparative Example 2, the embossing required for the present invention is not applied, and structural failure occurs at the time of elongation, so that the recoverability is poor. In addition, since the fiber diameter is thin and dense, air permeability is low and moisture permeability is low despite the addition of moisture-absorbing and releasing fine particles. Exhibits stretchable nonwoven fabric properties that are inappropriate for the base fabric of the sheets or tapes used.

[0043] (Comparative Example 3)

The processing pattern at the time of embossing is a lattice convex pattern, the crimping area is 25%, and the linear pressure is 20 kN / m. Table 2 shows the evaluation results of the stretchable nonwoven fabric obtained in the same manner as in Comparative Example 1 except for the above. In Comparative Example 3, the outermost resin coating required by the present invention was not applied, and the fluffing and squirting had a low density.Therefore, the air permeability was increased and the covering property was inferior. Since it is inferior, it exhibits an inappropriate stretch nonwoven fabric property that is not suitable for the base fabric of a sheet or tape to be applied to or coated on the skin surface.

[0044] (Comparative Example 4)

With the exception of Comparative Example 1, except that the web basis weight is 70 gZm ² and the embossed pattern is a grid convex pattern, the crimping area is 25%, the roll temperature is 120 ° C, and the linear pressure is 20 kN / m. Next, a non-woven fabric obtained in the same manner was dispersed in a solvent-based solution of acrylic resin and a pigment and Tufic HU manufactured by Toyobo Co., Ltd., which is a hygroscopic fine particle having an average diameter of 5 μm. Then, by the gravure printing method, the embossed surface was coated with ² gZm ² of the resin and hygroscopic fine particles lgZm ² and wound up. Table 2 shows the evaluation results of the resulting elastic nonwoven fabric. Comparative Example 4 is low in density, easily breaks when stretched, has poor recoverability, and exhibits slightly unsuitable elastic nonwoven fabric properties for the base fabric of a sheet or tape applied or coated on the skin surface.

[0045] (Comparative Example 5)

Polypropylene (PP) with a melt index of 20 is used for thermoplastic resin, and spinning is performed at a spinning temperature of 220 ° C. The embossed pattern is a lattice convex pattern with a crimp area of 25% and at a temperature of 120 ° C. Table 2 also shows the evaluation results of the nonwoven fabric obtained by the same method as in Comparative Example 1, except that the linear pressure was lOOkNZm. In Comparative Example 5, since the material is not elastomeric, the stretch recovery property is remarkably inferior, and other properties are also extremely inferior, so the nonwoven fabric properties are completely unsuitable for the base fabric of the sheet or tape to be applied to or coated on the skin surface. Indicates.

[Example 3]

Table 3 shows the evaluation results of the stretch nonwoven fabric obtained in the same manner as in Example 1 except that the basis weight of the web was lOOgZm ² and 0.05 wt% of moisture absorbing / releasing fine particles were added. Example 3 is an example having a high basis weight, which satisfies all the requirements of the present invention and exhibits an excellent feeling of wear, and is suitable for a base fabric of a sheet or tape to be applied to or coated on the skin surface. It exhibits excellent stretchable nonwoven fabric characteristics. [0047] [Table 3]

[0048] (Example 4)

The same as Example 1 except that a resin (A 14) containing 0.3% flesh colored inorganic fine particles in thermoplastic elastomer A-1 was used and no pigment was added to the aqueous dispersion for resin coating. Table 3 shows the evaluation results of the stretchable nonwoven fabric obtained. Except that it is composed of skin-colored primary fibers, it satisfies all the requirements of the present invention in the same manner as in Example 1 and exhibits an excellent feeling of wearing, and is a base fabric of a sheet or tape that is applied to or coated on the skin surface. It shows the best stretchable nonwoven fabric characteristics.

[0049] (Example 5)

A-4 is used as the thermoplastic elastomer, and it is discharged at a spinning temperature of 270 ° C and a single-hole discharge of 0.6gZ, and at a traction fluid temperature of 300 ° C, being pulled at 2500mZ for a semi-molten state. The fiber was blown onto the take-up net so that it became lOOgZm ^2, and the melt-blown sheet held in the form of a sheet by suction and fixed and taken up by the press roller was transferred, and then the temperature was 110. C, stretchable nonwoven fabric wound with embossing force at a linear pressure of 20 kNZm with an embossing roller with a 20% crimping area with a textured pattern, followed by an aqueous dispersion of acrylic resin and an average diameter of 5 Tough tic HU made by Toyobo Co., Ltd. Is dispersed in water-based dispersions, in offset printing, on one side, it was wound by applying榭脂amount 2GZm ² and moisture-absorbing and desorbing fine particles 0. 5gZm ^2. Table 3 shows the evaluation results of the resulting stretchable nonwoven fabric. Example 5 satisfies the requirements of the present invention and exhibits an excellent feeling of wearing, and shows the stretchable nonwoven fabric characteristics that are most suitable for the base fabric of a sheet or tape to be applied to or coated on the skin surface.

[0050] (Example 6)

The stretchable nonwoven fabric obtained by laminating the embossed nonwoven fabric obtained in Example 1 to a film thickness of 25 μm using A-1 was then heated to 110 ° C, θ. A composite stretch nonwoven fabric wound with a 5mm dot pattern and an embossing roller with a 5% crimp area and a linear pressure of 50kNZm and embossed on the surface of the film, and then averaged with solvent dispersions and pigments of acrylic resin Tuftic HU manufactured by Toyobo Co., Ltd., which is a hygroscopic fine particle with a diameter of 5 μm, is dispersed in the solvent-based dispersion, and the gravure is used to absorb and release the resin on the film surface at 0.5 g / m ^2. The wet fine particles were wound at 0.5 g / m ² . The resulting stretchable nonwoven fabric had an air permeability of 43 cm ³ Zcm ² 'sec, a moisture permeability of 9200 gZm ² ' 24 h, an MD elongation of 190%, and an MD20% elongation recovery rate of 88%. The results of wearing evaluation were as follows: simmering grade 4, follow-up ability grade 4, fuzziness grade 5 and peeling grade 5. Example 6 satisfies the requirements of the present invention and exhibits an excellent wearing feeling, and shows the stretchable nonwoven fabric characteristics that are optimal for the base fabric of a sheet or tape to be applied to or coated on the skin surface.

[0051] As is clear from Examples 1 to 5 and Comparative Examples 1 to 5, the stretchable nonwoven fabric satisfying the requirements of the present invention is a non-woven fabric that is most suitable for the base fabric of a sheet or tape to be applied to or coated on the skin surface. It is half U to be.

Industrial applicability

[0052] The stretchable nonwoven fabric of the present invention absorbs the nonwoven fabric surface even if it has a dense structure in order to impart the necessary strength to the fiber nonwoven fabric imparted with a thermoplastic elastic resin. By adding a moisture-releasing substance, it was possible to solve the fuzziness and provide excellent moisture permeability. In addition, since it has moderate elasticity that can follow the expansion and contraction of the skin surface and is difficult to peel off, it is a medical adhesive sheet that can be applied to or coated on the skin surface, such as adhesive plaster, pap, plaster, pantage, bandage, taping material, supporter, etc. It is possible to provide a stretchable nonwoven fabric that is optimal for the base fabric of adhesive tape. In addition, for house wrap applications that require water resistance, the ability to laminate with a film can provide a base fabric that satisfies both excellent moisture permeability and water resistance at the same time. It is important to contribute to the industry.

Claims

The scope of the claims

[1] A partially non-woven thermoplastic elastomer that is also thermocompression-bonded, wherein at least a part of the outermost layer of the non-woven fabric is coated with a resin and has an apparent density of 0.15 g / cm ³ As described above, air permeability is 200 cm ³ Zcm ² 'sec or less, moisture permeability is 8000 gZm ² ' 24 h or more, unidirectional elongation is 100% or more, and 20% elongation recovery is 80% or more. Elastic nonwoven fabric.

[2] The stretchable nonwoven fabric as set forth in [1], wherein the hygroscopic fine particles are contained in an amount of 0.01 to 10% by weight.

[3] The stretchable nonwoven fabric according to claim 1 or 2, wherein the thermoplastic elastomer fiber is a polyester elastomer fiber.

[4] The stretchable nonwoven fabric according to any one of claims 1 to 3, wherein a load at 100% elongation of the nonwoven fabric is 1.4 times or more of a load at 50% elongation.

[5] The fibers constituting the stretchable nonwoven fabric according to any one of claims 1 to 4, wherein the stretchable nonwoven fabric is composed of an original fiber composed of a resin in which colored fine particles such as pigments are kneaded into a thermoplastic elastomer. Sex non-woven.

[6] The stretch nonwoven fabric according to any one of claims 1 to 5, wherein a film having a melting point of 150 to 230 ° C and made of a block copolymerized polyester having a thickness of 5 to L: μm is extruded and laminated. Stretchable composite nonwoven fabric.

[7] A base fabric for sticking, characterized in that the stretchable nonwoven fabric or stretchable composite nonwoven fabric according to any one of claims 1 to 6 is used.