JPWO2018084145A1 - Composite laminate - Google Patents

Abstract

It can achieve both functionality and aesthetics required for clothing and advanced disposable diaper products. It also has excellent fit and smooth and well-ordered wrinkles, and has a homogeneous elastic fiber. It is an object to provide a composite laminate having an appearance. A composite laminate comprising a plurality of elastic fibers arranged in parallel in one direction between two fabrics and a resin extending in one direction arranged in a direction intersecting the elastic fibers, The two fabrics and the elastic fibers are separated between the elastic fibers and the resin extending in one direction adjacent to the longitudinal direction of the fibers, and the elastic fibers with respect to the fineness of the fibers constituting the fabrics. A composite laminate having a fineness ratio of 0.5 to 300. [Selection] Figure 1

Description

  The present invention relates to a composite laminate. More specifically, it is a composite laminate having elasticity, and is used for clothing that adheres to the skin, specifically underwear, sportswear, sanitary materials such as diapers for children and adults, and sanitary items. The present invention relates to a composite laminate having stretchability that can be suitably used.

  Conventionally, in applications that adhere to the skin such as sanitary materials such as disposable diapers, stretchable materials have been used in order to improve the feeling of wearing and the wearing stability.

  For example, in paper diapers, a composite laminate in which elastic fibers are inserted into a laminated nonwoven fabric is used to improve the fit with the body such as underbody, abdomen, waist, etc., or to prevent urine leakage. I came.

  Such a composite laminate having elasticity is often manufactured by laminating a plurality of elastic fibers into a predetermined draft and laminating with a plurality of fabric sheets such as nonwoven fabrics while maintaining the state. The form had a hot melt resin extending in a direction parallel to the elastic fibers in the fabric sheet such as a nonwoven fabric. Such a composite laminate is frequently used in disposable diapers and is a mainstream gather member.

  Furthermore, a composite laminate having a form having a heat-sealing fiber extending in a direction intersecting with an elastic fiber in a fabric sheet such as a nonwoven fabric as in Patent Documents 1 to 3 has been devised.

JP2013-202056A Japanese Patent Laying-Open No. 2005-320636 JP 2014-076077 A

  However, in any of these composite laminates, functions such as stretchability and feel have been improved in recent years, but their appearance and aesthetics have not been fully satisfactory. In other words, it is insufficient for use in advanced paper diaper products that can be used as underwear, and even apparel products such as sportswear.

  The main reason for the insufficient appearance is that the presence of elastic fibers in the composite laminate can be clearly discriminated visually. Such a point becomes more prominent by lowering the basis weight of the nonwoven fabric, giving priority to the feel and the like. The main reason for the insufficient aesthetics is that the composite laminate has irregular ridges and exhibits a surface or contour form unique to disposable diapers.

  The appearance and aesthetics of the composite laminate are one of the most important factors in developing advanced disposable diaper products and clothing. The biggest factor for recognizing that it is a diaper is that the folds of the composite laminate are irregular and that the presence of elastic fibers can be clearly identified visually. In particular, when the composite laminate is stretched, the elastic fibers at the time of stretching in the clothing fabric are exposed (blurring phenomenon). Stand out and make the appearance unsatisfactory. And even if it tries to give the designability by dyeing | staining or a textile printing process in order to improve this, an elastic fiber floats up in stripe shape or a stripe form, and makes it difficult to express the intended color and design.

  In this way, the appearance and aesthetics of the composite laminate are not excluded in the prior art, and the excellent fit and feel when worn, the homogeneous appearance in which elastic fibers are not noticeable, and the smooth and regularity It was not possible to obtain a composite laminate having Even if this technology is applied as it is, it has not been possible to achieve both the functionality required for advanced paper diaper products and clothing and the enhancement of appearance and aesthetics.

  The present invention achieves both the functionality, appearance and aesthetics required for obtaining advanced paper diaper products and clothing, that is, excellent fit and feel when worn, and elastic fibers are conspicuous. It is an object of the present invention to provide a composite laminate having a uniform appearance and a smooth and regular wrinkle.

As a result of intensive studies to solve the above problems, the present inventors have found a form having a high degree of stretching function and the presence of elastic fibers in the composite laminate is difficult to distinguish. That is,
A plurality of elastic fibers arranged in parallel in one direction between two fabrics;
A composite laminate having a resin extending in one direction arranged in a direction intersecting with elastic fibers,
Between each of the two fabrics and the elastic fiber, the elastic fibers are adjacent to each other in the longitudinal direction of the elastic fiber, and the elastic fiber intersects with the resin extending in one direction.
A composite laminate in which the ratio of the fineness of the elastic fibers to the fineness of the fibers constituting the fabric is 0.5 or more and 300 or less.

  The color difference ΔE between the elastic fiber and the fabric is preferably 10 or less.

  Moreover, the thickness at the location where the resin extending in one direction and the elastic fiber intersect is 0.1 mm or more and 5.0 mm or less, and the maximum value of the thickness between the locations adjacent to each other in the longitudinal direction of the elastic fiber is It is preferable that it is 1 mm or more and 20 mm or less.

  Moreover, it is preferable that the width of the resin extending in one direction is 0.2 mm or more and 10 mm or less at the maximum extension, and the resin interval is 1 mm or more and 20 mm or less at the maximum extension.

  Moreover, it is preferable that the heat softening point of an elastic fiber is 100 degreeC or more and 240 degrees C or less.

  Moreover, it is preferable that the resin extended in one direction arrange | positioned in the direction which cross | intersects an elastic fiber contains the component of a fabric and / or an elastic fiber.

  According to the present invention, it is possible to obtain a composite laminate having excellent stretchability and feel, and having a homogeneous appearance in which elastic fibers are not conspicuous and smooth and regular wrinkles. By using such a composite laminate of the present invention, it is possible to achieve both functionality, that is, excellent fit and feel when worn, and appearance and aesthetics, which are required for clothing and advanced paper diaper products. .

FIG. 3 is an external view photograph of the composite laminate of Example 1 taken from a substantially planar direction. FIG. 3 is an external view photograph of the test specimen of the composite laminate of Example 1 taken from a substantially cross-sectional direction. A shows the thickness at the location where the resin extending in one direction and the elastic fiber intersect, and B shows the maximum thickness measurement location between the location where the resin extending in one direction and the elastic fiber intersect.

As a result of intensive studies to solve the above problems, the present inventors have found a form having a high degree of stretching function and the presence of elastic fibers in the composite laminate is difficult to distinguish. That is,
A plurality of elastic fibers arranged in parallel in one direction between two fabrics;
A composite laminate having a resin extending in one direction arranged in a direction intersecting with elastic fibers,
Each of the two fabrics facing each other across the elastic fiber is separated between the elastic fiber adjacent to the longitudinal direction of the elastic fiber, and the resin extending in one direction and the elastic fiber,
It is a composite laminate in which the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric is 0.5 or more and 300 or less.

  By adopting such a configuration, the composite laminate of the present invention not only has an appearance as if it does not contain elastic fibers, but even if it is stretched and stretched for the hand, and further extended to the maximum extent, It has been found that it is difficult to distinguish the elastic fiber in the composite laminate, and the elastic function inherent to the elastic fiber is remarkably exhibited.

  First, the form of this composite laminated body is described.

  In this invention, it has the elastic fiber arrange | positioned in parallel by one direction between two fabrics. The elastic fibers are arranged in a linear shape or a curved shape or a combination thereof, and are sandwiched between fabrics.

  In this invention, it has resin extended in one direction arranged in multiple numbers in the direction which cross | intersects an elastic fiber. That is, the resin is arranged in a direction that intersects the direction in which the elastic fiber is inserted. Here, extending in one direction means that the resin is linear and is arranged in one direction as a whole. As the linear form, any of a linear form, a curved form, or a combination thereof can be taken. Arranging in one direction as a whole means arranging such a linear form within a range of parallel lines within a width of 10 mm, and the direction in one direction is the direction of such virtual parallel lines. The direction. The angle at which the elastic fiber and the resin extending in one direction intersect is not particularly limited, but is preferably 90 ± 20 °, more preferably 90 ± 10 °, and even more preferably 90 ± 5 °.

  In the present invention, each fabric and the elastic fiber are separated from each other at a location where the elastic fiber and the resin extending in one direction are adjacent to each other in the longitudinal direction of the elastic fiber.

  The thickness between the portions where the resin extending in one direction and the elastic fiber intersect is preferably 0.1 mm or more and 5.0 mm or less, and more preferably 0.2 mm or more and 4.0 mm or less. When smaller than 0.1 mm, the presence of elastic fibers in the composite laminate may be visually determined, and when the composite laminate is stretched, the presence of elastic fibers can be more significantly determined. The appearance and aesthetics of the composite laminate may be reduced. If it is larger than 5.0 mm, the formed heel may be easily cramped, and the fit of the garment when worn and the feel of a smooth and well-ordered heel may be unsatisfactory.

  And between the said places adjacent to the longitudinal direction of an elastic fiber, it is preferable that the maximum value of the thickness is 1 mm or more and 20 mm or less, More preferably, it is 2 mm or more and 10 mm or less. If it is smaller than 1 mm, the presence of elastic fibers in the stretched composite laminate may be clearly discernable visually, and if the composite laminate is stretched, the presence of elastic fibers can be discriminated more significantly. The appearance and aesthetics of the composite laminate may be deteriorated. If it is larger than 20 mm, the formed heel may tend to bend, and the fit when worn and the feel of the heel with smooth and regularity may be unsatisfactory.

  The width of the resin extending in one direction is preferably 0.2 mm or more and 10 mm or less at the maximum extension, and more preferably 0.4 mm or more and 6 mm or less. If it is smaller than 0.2 mm, the elastic fibers in the composite laminate are easy to move, and when the expansion and contraction are repeated, the uniformity of wrinkles is reduced, or adjacent elastic fibers are close to each other, and the presence can be visually determined. In some cases, the appearance and aesthetics of the composite laminate may be reduced. When the thickness is larger than 10 mm, the presence of elastic fibers may be noticeable in a streak shape or a stripe shape when the composite laminate is viewed with transmitted light. Further, the elongation of the composite laminate may be reduced, and the placement size may be increased, or the fit when worn and the smooth and regular feel of the heel may be unsatisfactory.

  And it is preferable that the space | interval of the resin extended to one direction is 1 mm or more and 20 mm or less at the time of maximum expansion | extension, More preferably, it is 2 mm or more and 15 mm or less. The interval between the resins extending in one direction refers to the distance between the centers of the resins extending in one direction. When such an interval is smaller than 1 mm, the case where the presence of elastic fibers in the composite laminate can be clearly discerned appears, and when the composite laminate is stretched, it is more prominent. Aesthetics may be reduced. If it is larger than 20 mm, the formed heel may be easily cramped, and the fit of the garment when worn and the feel of a smooth and well-ordered heel may be unsatisfactory.

The fabric used in the composite laminate of the present invention is preferably a woven fabric, a knitted fabric, a non-woven fabric, etc., and a particularly preferable fabric is a non-woven fabric, a wet non-woven fabric manufacturing method such as a papermaking method, a resin bond type, a thermal bond type, a needle punch type. Any of those obtained by a dry nonwoven fabric production method such as a spunbond method, a spunlace method, a melt blow method, and a flash spinning method may be used. Good. From the standpoint of aesthetics and feel, the basis weight is preferably 10 to 40 g / ^{m 2,} more preferably 10 to 25 g / ^{m 2,} more preferably 12~18g / ^{m 2.}

  The material of the fibers constituting the fabric is not particularly limited, but polyester, polyamide, polyacrylonitrile, polypropylene, polyethylene, copolymers of various α-olefins such as propylene and ethylene, synthetic fibers such as polyurethane, regenerated fibers such as rayon and acetate, Semi-synthetic fibers, natural fibers such as wool and cotton are preferred.

  The form of the fibers constituting the fabric may be either long fiber filaments or short fiber spun yarns. Two or more types of fibers may be mixed or mixed, crimped, or other composites Fibers can be selected widely.

  The composite laminate of the present invention is one in which elastic fibers are used at least in part.

  The elastic fiber used in the present invention is a polyurethane-based elastic fiber, a polyether-ester-based elastic fiber, a polyamide-based elastic fiber, or a so-called rubber thread made of natural rubber, synthetic rubber, semi-synthetic rubber, Those obtained by cutting an elastomer film into fibers, or fibers obtained by combining or mixing with other organic synthetic resin bodies mainly composed of these, crimped fibers, etc. can be adopted, and the fibers themselves have enthalpy elasticity More preferred. From the viewpoint of better exhibiting stretchability as the composite laminate, polyurethane elastic fibers are most preferable.

  The elastic fiber used in the composite laminate of the present invention may be a bare yarn or may be covered (covered) with other elastic fibers or non-elastic fibers. From the viewpoint of stretchability, the bare laminate is most preferable as the composite laminate.

  The polyurethane elastic fiber is a polyester mainly composed of a long-chain diol such as a copolyesterdiol as a soft segment, a diisocyanate such as diphenylmethane-4,4 diisocyanate as a hard segment, and a bifunctional hydrogen compound as a chain extender. Polyether methylene glycol having a polytetramethylene ether glycol as a soft segment, diphenylmethane-4,4 diisocyanate as a hard segment, and a low molecular weight difunctional hydrogen compound as a chain extender is preferred as a main component.

  In addition, the polyether / ester-based elastic fiber is preferably composed mainly of polytetramethylene ether glycol as a soft segment and polybutyl terephthalate or polybutyl isophthalate as a hard segment.

  In the present invention, it is preferable to use polyurethane-based elastic fibers from the viewpoint of imparting desired stretchability to the final product.

  The polyurethane polymer used in the polyurethane elastic fiber that can be used in the present invention is a soft segment, an isocyanate, and a chain extender, each having a long-chain polyether segment, a polyester segment, or a polyether ester segment as main components. It is preferable to be comprised from the hard segment which uses diamine or diol as a main structural component.

  The raw material constituting the soft segment of such a polyurethane polymer is 1) a polymer or copolymer obtained from tetrahydrofuran, tetramethylene glycol, 3-methyl-1,5-pentanediol, tetrahydrofuran, 3-methyltetrahydrofuran or the like. Some polyether segments, 2) Polyester segments obtained from diols such as ethylene glycol, tetramethylene glycol, 2,2-dimethyl-1,3-propanediol, and dibasic acids such as adipic acid and succinic acid, and 3) poly Polyether ester segments obtained from-(pentane-1,5-carbonate) diol, poly- (hexane-1,6-carbonate) diol, etc. can be used, but among them, polyether obtained from tetramethylene glycol Segment, i.e. polytetramethylene ether glycol (hereinafter, abbreviated as PTMG) are preferred.

  In the elastic fiber used in the composite laminate of the present invention, the polyurethane polymer is obtained by subjecting a prepolymer product obtained by polyaddition reaction of a hydroxyl-terminated soft segment precursor with an organic diisocyanate (capping reaction) to an amine chain extender or It can be obtained by chain extension with a diol chain extender. Furthermore, for the purpose of adjusting the heat softening point, it is also preferable to obtain the prepolymer product by further reacting with an organic diisocyanate and then reacting with a chain extender.

  Examples of the organic diisocyanate used for the polyurethane polymer in the present invention include bis- (p-isocyanatophenyl) -methane (hereinafter abbreviated as MDI), tolylene diisocyanate (hereinafter abbreviated as TDI), bis- (4- Isocyanatocyclohexyl) -methane (hereinafter abbreviated as PICM), hexamethylene diisocyanate, 3,3,5-trimethyl-5-methylenecyclohexyl diisocyanate, and the like can be used, and MDI is particularly preferable.

  Various diamines such as ethylenediamine, 1,3-cyclohexanediamine, 1,4-cyclohexanediamine and the like are preferably used as amine chain extenders for forming polyurethaneurea.

  The amine chain extender is not limited to only one kind of diamine, and may be composed of plural kinds of amines. A chain terminator can be included in the reaction mixture to help control the final molecular weight of the polyurethaneurea. Usually, a monofunctional compound having active hydrogen as a chain terminator, such as diethylamine, can be used.

  Further, the chain extender is not limited to the above amine, and may be a diol. In particular, it is suitable for obtaining an elastic fiber having a heat softening point of 100 ° C to 180 ° C. For example, ethylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,2-propylene glycol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol, 1,4-bis (Β-hydroxyethoxy) benzene, bis (β-hydroxyethyl) terephthalate, paraxylylene diol, and the like can be used. The diol chain extender is not limited to only one type of diol, and may be composed of a plurality of types of diols. Moreover, you may use together with the compound containing one hydroxyl group which reacts with an isocyanate group. In this case, various methods such as a melt polymerization method and a solution polymerization method can be adopted as a method for obtaining such a polyurethane, and the method is not limited. The polymerization formulation is not particularly limited, and for example, a method of synthesizing polyurethane by simultaneously reacting a polyol, a diisocyanate, and a chain extender composed of a diol can be employed. It may be a thing.

  Furthermore, it is also preferable to blend a stabilizer, a thermal conductivity improver and a pigment within a range not impairing the effects of the present invention.

  For example, hindered phenol-based drugs such as so-called BHT and Sumitizer (registered trademark) GA-80 manufactured by Sumitomo Chemical Co., Ltd. Trademark) ”and other benzotriazole-based, benzophenone-based agents, phosphorus-based agents, various hindered amine-based agents, fluororesin powders or silicone resin powders based on polyvinylidene fluoride, metal soaps such as magnesium stearate In addition, bactericides and deodorants containing silver, zinc, and these compounds, as well as various lubricants such as lubricants such as silicone and mineral oil, barium sulfate, cerium oxide, betaine, phosphate compounds, and phosphate ester compounds An inhibitor or the like may be added, or may exist by reacting with the polymer. In particular, in order to further enhance the durability to light and various nitric oxides, a nitric oxide scavenger, for example, HN-150 manufactured by Nippon Hydrazine Co., “Hostanox (registered trademark)” SE10 manufactured by Clariant Corporation, etc. It is preferable to contain a thermal oxidation stabilizer.

  In order to promote melting and thermal softening, it is preferable to contain, for example, alumina, boron nitride, aluminum nitride, silica, silicon nitride, magnesium oxide, magnesium carbonate, silicon carbide or the like as a thermal conductivity improver.

  For example, the pigment preferably contains titanium oxide, zinc oxide, zirconium phosphate or the like. Among these, titanium oxide is preferred from the viewpoint of suppressing the glare caused by peeling of the elastic fibers and obtaining a composite laminate having a homogeneous appearance in which the elastic fibers are not noticeable. As long as it is titanium oxide, either a rutile type or an anatase type is preferably used. Further, from the viewpoint of suppressing reflection of light and stably producing a polyurethane elastic yarn, it is preferable that the average primary particle diameter is in the range of 0.15 μm to 0.3 μm. The content in the polyurethane elastic yarn is preferably 0.3% by mass or more from the viewpoint of preventing glare, and 3% by mass from the viewpoint of stably spinning the polyurethane elastic fiber while preventing clogging of the die. % Or less is preferable.

  In order to promote melting and thermal softening, it is preferable to contain, for example, alumina, boron nitride, aluminum nitride, silica, silicon nitride, magnesium oxide, magnesium carbonate, silicon carbide or the like as a thermal conductivity improver.

  N, N-dimethylacetamide (hereinafter abbreviated as DMAc), dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone and the like can be used as a solvent when the polyurethane polymer is used as a solution. It is the most commonly used solvent.

  The solution concentration of the polyurethane polymer is preferably a dry spinning method for obtaining filament yarns of polyurethane elastic fibers at a solution concentration of 30 to 50% by mass (based on the total mass of the solution).

  In the present invention, the method for spinning polyurethane-based elastic fibers from a polyurethane polymer is not particularly limited. For example, 1) As a spinning method for polyurethane-based elastic fibers using diol as a chain extender, melt spinning is used. A method, a dry spinning method or a wet spinning method can be employed. In addition, as a spinning method for polyurethane-based elastic fibers using amine as a chain extender, a normal dry spinning method can be employed.

  In the present invention, the use of a filament yarn of polyurethane-based elastic fiber is suitable from the viewpoint of high stretchability, particularly stretch recovery stress, but the elastic fiber itself tends to be noticeable. Therefore, the following fiber specifications and combinations are preferable.

  The fineness of the fibers and elastic fibers constituting the fabric can be appropriately selected according to the intended use, but is preferably in the range of 0.1 to 5000 dtex.

  The fineness of the fabric constituting the composite laminate in the present invention represents the maximum fineness of the fibers distributed on the fabric surface.

  The fineness of the fibers constituting the fabric is more preferably from 0.1 to 500 dtex, more preferably from 0.1 to 50 dtex, and even more preferably from 0.3 to 30 dtex from the viewpoint of forming highly uniform wrinkles. . And from a viewpoint of the touch of a composite laminated body, 0.2-5 dtex is preferable, 0.2-2.0 dtex is more preferable, 0.2-1.5 dtex is further more preferable.

  Further, the fineness of the elastic fiber is more preferably 1 to 3000 dtex, and further preferably 10 to 200 dtex. In the present invention, the fineness of the elastic fiber is an apparent fineness measured according to ISO2060, and the measurement method is as follows. The sample of the elastic fiber used for the measurement of the apparent fineness is a sample that is allowed to stand for 24 hours in an environment of 20 ° C. and 65% relative humidity. An elastic fiber is cut to a length d (unit: m) under no load, and an apparent fineness (decitex) = yarn mass (g) of length d (m) × 10000 ÷ d is obtained to one decimal place. Here, the length d is usually 0.1 m, but it is not necessary to be a single continuous fiber, and the total length d ′ of a plurality of fibers may be 0.1 m. In this case, when a sample of elastic fibers is taken out from the composite laminate, the elastic fibers arranged between the two fabrics may be sampled from a location separated from each fabric. For example, the composite laminate is cut with scissors along a resin extending in one direction and arranged in a direction intersecting the elastic fibers, and the elastic fiber pieces having a good linear shape have a total length. The dimensions are measured with an optical microscope until 0.1 ± 0.01 m, a plurality of elastic fiber pieces are selected, and the total length d ′ is obtained. Next, there is a method in which the total mass of a plurality of elastic fiber pieces selected with a precision balance is measured, and the total mass (g) of the elastic fiber pieces × 10000 ÷ d ′ is calculated to obtain the fineness of the elastic fibers.

  When an elastic fiber having a fineness of less than 10 dtex is used, there is a tendency that the elastic fiber cannot withstand running friction and yarn breakage tends to occur at the time of manufacture. Also, when an elastic fiber exceeding 5000 dtex is used, The sensor side cannot withstand running friction and tends to be damaged.

  In the composite laminate of the present invention, from the viewpoint of appearance quality, the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric is preferably 0.5 or more and 300 or less, and is 0.5 or more and 250 or less. More preferably, it is 0.5 or more and 200 or less.

  In order to obtain a composite laminate having a homogeneous appearance in which elastic fibers are not conspicuous (that is, a form in which the presence of elastic fibers in the composite laminate is difficult to distinguish), the fineness of the fibers constituting the fabric (that is, distributed on the surface of the fabric) The fineness ratio between the maximum fineness of the fiber and the elastic fiber is important. This is because the influence of surface reflected light is more dominant than transmitted light in determining the presence of elastic fibers in the composite laminate. If the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric exceeds 300, the presence of the elastic fiber is noticeable and the appearance quality is impaired. On the other hand, if the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric is 0.5 or more and 300 or less, the presence of the elastic fiber cannot be easily recognized visually, and the appearance quality is particularly excellent. This effect is more prominent when the fineness of the fibers constituting the fabric is in the range of 0.2 to 2.5 dtex. From this viewpoint, the fineness of the fibers constituting the fabric is more preferably 0.2 to 2.0 dtex, and further preferably 0.2 to 1.5 dtex. If the ratio of the fineness of the elastic fiber to the maximum fineness of the fiber distributed on the fabric surface is greater than 300, the presence of the elastic fiber in the composite laminate may be clearly visible, and when the composite laminate is stretched, It becomes easier to discriminate visually, and the appearance and aesthetics of the composite laminate are deteriorated. From this viewpoint, 0.5 or more and 160 or less are preferable, and 0.5 or more and 100 or less are more preferable. If it is less than 0.5, the elasticity of the elastic fiber is substantially insufficient, wrinkles are hardly formed, and stretchability may not be exhibited.

  In the composite laminate of the present invention, the color difference ΔE between the elastic fiber and the fabric is preferably 10 or less.

  The color difference here is a value calculated by an expression described later from each value of L value, a value, and b value in the Lab color system described later. When the color difference ΔE is 10 or less, the elastic fiber is not noticeable when the composite laminate is stretched, and the aesthetics at the time of wearing is maintained.

  In the present invention, the elastic fiber may be an original yarn, and it is also preferable to use a fabric and a fiber constituting the fabric that are colored in advance. Although it does not specifically limit about the coloring method of a fabric and the fiber which comprises it, From the viewpoint of coloring with the same color as an elastic fiber, it is also preferable to color by cheese dyeing etc. which can adjust a color.

  The L value, a value, and b value in the Lab color system are defined as values obtained by measurement as follows.

  10 g of a fiber to be measured is wound on a stainless steel plate to form a card-like sample and measured using a non-contact type spectrocolorimeter (for example, a color master D25 DP-9000 type signal processor). Value, b value is also obtained from this measurement).

Here, the L value in the Lab color system is an index representing lightness as described above, the a value is a position between red and green, and the b value is an index representing a position between yellow and blue. Each of these values is a value obtained by measuring a fiber or fabric to be measured on a stainless steel plate on a stainless steel plate in the same manner as the above L value and measuring it using a non-contact spectrocolorimeter. Define.
If the color difference ΔE is greater than 10, the elastic fibers in the composite laminate can be visually confirmed regardless of the fineness ratio, and the aesthetics may be impaired.

  Preferred as the elastic fiber used in the present invention is that there is no practical problem, including process passability, and excellent shape at the point where the elastic fiber and the resin extending in one direction intersect. From the viewpoint of obtaining, those having a thermal softening point in the range of 100 ° C. or higher and 240 ° C. or lower are preferable. If the heat softening point is lower than 100 ° C, the form may be destroyed by processing steps such as dyeing or practically by tumbler drying. If it is higher than 240 ° C, the resin and elastic fibers extending in one direction intersect. The presence of the elastic fiber at the location is conspicuous, and an unsatisfactory appearance may occur, or the thickness of the laminate may become too large. The range of the heat softening point is more preferably 110 ° C. or higher and 200 ° C. or lower, and still more preferably 120 ° C. or higher and 160 ° C. Within this range, a heat roll, an ultrasonic welder, a high frequency welder, an electromagnetic induction welder, or a composite welder thereof, which is a well-known method, is used to extend in one direction in which a plurality of them are arranged in a direction crossing the elastic fiber. It is suitable for the resin constituting the elastic fiber and / or the material constituting the fabric to be softened or melted.

  In the fabric used for the composite laminate of the present invention, there are resins extending in one direction arranged in a direction intersecting with the elastic fibers, and the resins are hot melt adhesives, solvent-based adhesives, etc. Various adhesives and elastic fibers and / or materials constituting the fabric are heat-softened or melted.

  When the material constituting the fabric is heat-softened or melted, various known methods such as heat embossing and ultrasonic fusion can be employed.

  It is also preferable that a mechanical entanglement method such as a needle punch or a water jet is added to the resin region extending in one direction.

  Furthermore, a resin preferable as a resin extending in one direction is a resin containing the same kind of material as that of the fabric and elastic fibers in order that the present invention enhances the effect thereof, and more preferably includes a component of the fabric and elastic fibers. preferable. When a resin containing such a fabric or elastic fiber component is used as the resin extending in one direction, it is also preferable to thermally soften or melt the fabric or elastic fiber to form a resin extending in one direction. More preferably, both the fabric and the elastic fiber are heat-softened or melted.

  The composite laminate of the present invention is a composite laminate having elasticity, and is a garment that is in close contact with the skin, specifically underwear, sportswear, diapers for children and adults, sanitary products, masks, and medical wear. It is suitable for use in hygiene materials such as surgical clothes, bandages, supporters, medical materials, etc., and also because of its excellent aesthetics, interior products such as curtains and furniture, bedding, lining, girdles, bras, inti Applications include mate products, clothing waistbands, stretch sportswear, and stretch outerwear.

  Hereinafter, the present invention will be described using examples.

[Thermal softening point]
The thermal softening point was measured as one of the heat resistance indicators of polyurethane fibers. With respect to the polyurethane fiber, the temperature dispersion of the dynamic storage elastic modulus E ′ was measured at a heating rate of 10 ° C./min using a dynamic elastic modulus measuring device RSAII manufactured by Rheometric. The thermal softening point was determined from the intersection of the tangent line in the plateau region where the E ′ curve was 80 ° C. or higher and 130 ° C. or lower and the tangent line of the E ′ curve where E ′ decreased due to thermal softening at 160 ° C. or higher. Note that E ′ is a logarithmic axis, and temperature is a linear axis.

[Color measurement]
A sample card was prepared by winding 10 g of the fiber to be measured on a stainless steel plate. Using a color master (D25 DP-9000 type signal processor) as a non-contact type spectrocolorimeter, each of L value, a value, and b value in the Lab color system was measured. The color difference “ΔE” between the target fibers was obtained from the following formula.

ΔE = √ ((L2−L1) ² + (a2−a1) ² + (b2−b1) ² )
(L1, a1, b1) are measured values of the elastic fiber (L2, a2, b2) are measured values of the fabric or the fibers constituting the fabric.

[Appearance evaluation of composite laminate]
A sensory evaluation was performed by 10 assessors to observe with the naked eye whether or not the elastic fibers inserted into the laminate were conspicuous from above the laminate. The judgment results are displayed in the following categories.

  S: Eight or more people felt inconspicuous.

  A: Fewer than 8 and 6 or more felt inconspicuous.

  B: Fewer than 6 people and 4 people felt inconspicuous.

  C: Fewer than 4 people felt inconspicuous.

[Evaluation of regularity of wrinkles of composite laminate]
In the relaxed composite laminate, sensory evaluation was performed by 10 judges to determine whether or not the wrinkles generated in the composite laminate had regularity. The judgment results are displayed in the following categories.

  S: Eight or more people felt that there was regularity.

  A: Fewer than 8 and 6 or more felt regular.

  B: Fewer than 6 and 4 or more felt regular.

  C: Fewer than 4 people felt regular.

[Feeling evaluation of laminate]
The laminate was touched with bare hands, and sensory evaluation was performed by 10 judges to determine the flexibility felt from the touch. The judgment results are displayed in the following categories.

  S: More than 8 people felt flexible.

  A: Fewer than 8 and 6 or more felt flexible.

  B: Fewer than 6 and 4 or more felt flexible.

  C: Fewer than 4 people felt flexible.

[Stretch evaluation of laminates]
The relaxed laminate was stretched with bare hands, and sensory evaluation was performed by 10 judges to determine the stretchability of the laminate. The judgment results are displayed in the following categories.

  S: Eight or more felt that the stretchability was excellent.

  A: Fewer than 8 and 6 or more felt that the stretchability was excellent.

  B: Fewer than 6 and 4 or more felt that the stretchability was excellent.

  C: Fewer than 4 people felt that the elasticity was excellent.

[Fit: Dispersion of tightening force of disposable diapers]
A sensory evaluation was performed in which ten judgment persons pressed the skin to observe whether the laminate used in the gathered part of the paper diaper felt that it was difficult for human skin to enter. The judgment results are displayed in the following categories.

  S: More than 8 people felt it was difficult to bite.

  A: Fewer than 8 and 6 or more felt that biting was difficult.

  B: Fewer than 6 people and 4 or more people felt difficult to bite.

  C: Fewer than 4 people felt that biting was difficult.

[Fineness of fabric]
The fibers on the surface of the fabric are observed using a scanning electron microscope, the maximum value (α) of the diameters of 10 randomly selected surface fibers is measured, and the density (ρ) g / m of the substance constituting the fabric ³ was used to determined from the following formula.

Fineness (dtex) = ρ × π × (α / 2) ² × 10000.

[Fineness of elastic fiber]
The composite laminate was cut using scissors along a resin extending in one direction and arranged in a direction intersecting with the elastic fibers. The elastic fiber pieces having a good linear shape are measured with an optical microscope until the total length becomes 0.1 ± 0.01 m, a plurality of elastic fiber pieces are selected, and the total length d ′ is obtained. Next, the total mass of the plurality of elastic fiber pieces selected with a precision balance was measured, and the total mass (g) of the elastic fiber pieces × 10000 ÷ d ′ was calculated to obtain the fineness of the elastic fibers.

[Example 1]
Elastic fiber used: “Lycra (registered trademark) fiber” T-127C manufactured by Toray Operontex Co., Ltd.
Fineness of the elastic fiber: 78 dtex
Number of elastic fibers constituting elastic fiber beam: 76 Fiber length of elastic fiber wound on bobbin as elastic fiber beam: 20,000 m
Bobbins used: Aluminum bobbins with a flange (cylinder outer diameter 20 cmφ, winding width 22.5 cm, rod outer diameter 38.0 cmφ)
Tape used: Fabric adhesive tape (width 2.5 cm, length 24.5 cm)
Nonwoven fabric used: PP spunbond, SMS, basis weight 16 g / m ² , fabric fineness 1 dtex
According to the method of Japanese Patent Application Laid-Open No. 2005-320636, 76 elastic fiber wound fiber bodies are arranged on a feed roller and unwound and fed at the same speed, and the 76 elastic fibers are evenly arranged in parallel within a width of 20 cm. The elastic fiber was wound up in a state where the elastic fiber was stretched 100% on the bobbin, and an elastic fiber beam wound body in which the fiber length of the elastic fiber was wound up to 20,000 m was produced. In addition, before winding up on a bobbin, the cloth adhesive tape was affixed over the beam width in the position of 200 cm from the winding start end of the elastic fiber beam. Furthermore, a cloth adhesive tape was pasted over the beam width at a position 300 cm from the end of winding.

  From the polyurethane elastic fiber beam winding body, 76 polyurethane elastic fibers were unwound and supplied so that the fiber speed was 66.7 m / min. The two nonwoven fabric wound bodies were unwound and supplied so that the linear velocity of the nonwoven fabric was 100 m / min. Between the two supplied non-woven fabrics, a polyurethane elastic fiber divided into 2 mm pitches with a fiber dividing guide is arranged so as to be arranged in parallel, and applied with a design roller according to the method of JP-A-2014-76077 Using a device, a resin-coated band-shaped coating surface perpendicular to the transport direction of the laminate is 2 mm wide, and a blank portion between the resin-band-shaped coated surfaces is 6 mm, and then a composite laminate is prepared. Paper diapers were manufactured.

The prepared composite laminate had a soft feel and a high flexibility, and the elastic fiber could not be visually confirmed. When the fineness of the fabric of the prepared composite laminate was measured, it was 1.0 dtex, and the fineness of the elastic fiber was measured, which was 77.6 dtex.
Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper. In addition, the measurement points for “the thickness at the point where the resin extending in one direction and the elastic fiber intersect” and “the maximum value of the thickness between the point where the resin extending in one direction and the elastic fiber intersect” are shown in FIG. Shown in

[Example 2]
A composite laminate and a disposable diaper were produced in the same manner as in Example 1 except that the following elastic fibers were used.
Elastic fiber used: “Lycra (registered trademark) fiber” T-127C manufactured by Toray Operontex Co., Ltd.
Fineness of the elastic fiber: 44 dtex
The prepared composite laminate had a soft feel and a high flexibility, and the elastic fiber could not be visually confirmed.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 3]
A composite laminate and a disposable diaper were produced in the same manner as in Example 1 except that the elastic fiber and the number were changed to the following and the arrangement was changed to a 4 mm pitch.
Elastic fiber used: “Lycra (registered trademark) fiber” T-127C manufactured by Toray Operontex Co., Ltd.
Fineness of the elastic fiber: 156 dtex
The number of elastic fibers constituting the elastic fiber beam: 38 The composite laminate produced was soft and flexible, and it was difficult to visually confirm the elastic fibers.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 4]
A composite laminate and a disposable diaper were produced in the same manner as in Example 1 except that the elastic fibers and the number of elastic fibers were changed as follows.
Elastic fiber used: “Lycra (registered trademark) fiber” T-127 manufactured by Toray Operontex Co., Ltd.
Fineness of the elastic fiber: 78 dtex
The number of the elastic fibers constituting the elastic fiber beam: 76 The composite laminate produced was soft and flexible, and it was difficult to visually confirm the elastic fibers.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 5]
A composite laminate and a disposable diaper were produced in the same manner as in Example 1 except that the elastic fiber produced by the following method was used and an ultrasonic welder was used from the design roller device when creating the composite laminate.

  MDI was charged to 1.6 mol per mol of PTMG having a number average molecular weight of 2000, and reacted at 70 ° C., and the resulting reaction product was sufficiently stirred in N, N-dimethylacetamide (DMAc). And dissolved to obtain a solution. Next, 0.4 mol of MDI is added to 1 mol of PTMG having a number average molecular weight of 2000 and the mixture is sufficiently stirred, and then a DMAc solution containing 1,4-butanediol as a chain extender is added and stirred sufficiently. Further, a DMAc solution containing butanol as a terminal blocking agent was added to prepare a polyurethane solution pu1 having a polymer solid content of 35% by mass. The resulting solution had a viscosity of about 3300 poise at 40 ° C. The polymer had an intrinsic viscosity of 0.88 when measured at 25 ° C. at a solution concentration of 0.5 g / 100 ml in DMAc.

  Next, as an antioxidant, a polyurethane solution (“METACROL (registered trademark)” 2462D manufactured by DuPont) formed by a reaction of t-butyldiethanolamine and methylene-bis- (4-cyclohexyl isocyanate), Mixing with a condensation polymer of p-cresol and divinylbenzene ("Metacral (registered trademark)" 2390D manufactured by DuPont) in a ratio of 2 to 1 (mass ratio), an antioxidant DMAc solution (concentration 35 mass%) And 96 parts by mass of the polyurethane solution pu1 and 4 parts by mass of the antioxidant solution were mixed to obtain a polymer solution (A1). Next, as a white pigment, titanium oxide “TIPAQUE (registered trademark)” PF-711 manufactured by Ishihara Sangyo Co., Ltd. and anhydrous magnesium carbonate “Magseees (registered trademark)” manufactured by Kamishima Chemical Co., Ltd. were dispersed in DMAc at a mass ratio of 1: 1, and the concentration was 35 A mass% DMAc dispersion (B1) was prepared. Further, a 35% by mass DMAc dispersion (C1) comprising ferric oxide, iron oxyhydroxide, and carbon black was prepared as a color pigment.

  The polymer solution A1, B1, and C1 were mixed at a ratio of 98.7% by mass, 1.0% by mass, and 0.3% by mass, respectively, to prepare a raw fiber solution pus1. This pus1 is ejected from the spinneret into a high-temperature (350 ° C.) inert gas (nitrogen gas) with 5 filaments, dried by passing through this high-temperature gas, and air jet so that the fibers in the middle of drying are twisted together 5 filaments were bonded together through a type twisting fiber machine, and wound at a speed of 600 m / min to produce 78 dtex polyurethane elastic fiber (PU1).

The heat softening point of this polyurethane elastic fiber (PU1) was 151 ° C.
The prepared composite laminate was soft and rich in flexibility, and it was difficult to visually confirm elastic fibers.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 6]
Example 1 except that a design roller coating device was used to make the resin coating strip-shaped coating surface perpendicular to the transport direction of the composite laminate 5 mm wide, and the space between the resin strip coating surfaces was 8 mm. A composite laminate was produced in the same manner as described above, and then a normal paper diaper was produced.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 7]
A composite laminate and a disposable diaper were produced in the same manner as in Example 3 except that the elastic fiber and the number were changed as follows.
Elastic fiber used: “Lycra (registered trademark) fiber” T-127C manufactured by Toray Operontex Co., Ltd.
Fineness of the elastic fiber: 225 dtex
The number of elastic fibers constituting the elastic fiber beam: 38 composite laminates, the elastic fibers were confirmed from the appearance, but the regularity of the heel was good, and the fit in the paper diaper was other Slightly inferior to the example.
Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 8]
A composite laminate and a disposable diaper were produced in the same manner as in Example 7, except that the nonwoven fabric was changed to the following nonwoven fabric.
Nonwoven were used: PP spunbond, SMS, basis weight 18 g ^{/ m} 2,
Fabric fineness 2.2dtex
The produced composite laminate was difficult to visually confirm the elastic fiber. Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 9]
A composite laminate and a disposable diaper were produced in the same manner as in Example 7, except that the nonwoven fabric was changed to the following nonwoven fabric.
Nonwoven fabric used: PP spunbond, two-layer structure, basis weight 18 g / m ² ,
Fabric fineness 0.8dtex
The prepared composite laminate was soft and soft. Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Example 10]
A composite laminate and a disposable diaper were produced in the same manner as in Example 9, except that the elastic fiber was produced by the following method.
The vessel was charged with 1.6 mol of MDI with respect to 1 mol of PTMG having a number average molecular weight of 1800, reacted at 70 ° C., and the resulting reaction product was sufficiently stirred in N, N-dimethylacetamide (DMAc). And dissolved to obtain a solution. Next, a DMAc solution containing ethylenediamine as a chain extender was added and stirred sufficiently to prepare a polyurethane solution pu2 having a polymer solid content of 35% by mass. The resulting solution had a viscosity of about 2800 poise at 40 ° C. The polymer had an intrinsic viscosity of 0.92 when measured at 25 ° C. at a solution concentration of 0.5 g / 100 ml in DMAc.

Next, as an antioxidant, a polyurethane solution (“METACROL (registered trademark)” 2462D manufactured by DuPont) formed by a reaction of t-butyldiethanolamine and methylene-bis- (4-cyclohexyl isocyanate), Mixing with a condensation polymer of p-cresol and divinylbenzene ("Metacral (registered trademark)" 2390D manufactured by DuPont) in a ratio of 2 to 1 (mass ratio), an antioxidant DMAc solution (concentration 35 mass%) And 96 parts by mass of the polyurethane solution pu2 and 4 parts by mass of the antioxidant solution were mixed to obtain a polymer solution (A2). Next, as a white pigment, titanium oxide “TIPAQUE (registered trademark)” PF-711 manufactured by Ishihara Sangyo Co., Ltd. and anhydrous magnesium carbonate “Magseees (registered trademark)” manufactured by Kamishima Chemical Co., Ltd. were dispersed in DMAc at a mass ratio of 1: 1, and the concentration was 35 A mass% DMAc dispersion (B1) was prepared. Further, a 35% by mass DMAc dispersion (C1) comprising ferric oxide, iron oxyhydroxide, and carbon black was prepared as a color pigment.
Polymer solution A2, B1, and C1 were mixed at a ratio of 98.7% by mass, 1.0% by mass, and 0.3% by mass, respectively, to prepare a spinning fiber stock solution pus2. This pus2 is ejected from the spinning die into 10-filaments in an inert gas (nitrogen gas) at a high temperature (350 ° C.), dried by passing through the high-temperature gas, and an air jet so that the fibers being dried are twisted together. 10 filaments were united through a type twisting fiber machine and wound at a speed of 500 m / min to produce 225 dtex polyurethane elastic fiber (PU2).

  The prepared composite laminate was able to recognize the presence of elastic fibers, but was soft and rich in flexibility.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Comparative Example 1]
A composite laminate and a disposable diaper were produced in the same manner except that the elastic fiber and the nonwoven fabric described below were changed to Example 3.
Elastic fiber used: “Lycra (registered trademark) fiber” T-127C manufactured by Toray Operontex Co., Ltd.
Nonwoven fabric used: PP spunbond, two-layer structure, basis weight 18 g / m ² ,
Fineness of fabric 0.8 dtex Fineness of elastic fiber: 310 dtex
The number of elastic fibers constituting the elastic fiber beam: The composite laminate produced by 20 had inferior fit to the disposable diaper because the elastic fibers could be clearly confirmed from the appearance.
Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Comparative Example 2]
A composite laminate and a paper diaper were produced in the same manner as in Example 1 except that the following elastic fibers and number were used and the arrangement was changed to 19 mm pitch.
Elastic fiber used: “Lycra (registered trademark) fiber” T-127C manufactured by Toray Operontex Co., Ltd.
Fineness of the elastic fiber: 470 dtex
The number of elastic fibers constituting the elastic fiber beam: The composite laminate produced by 8 had elastic fibers clearly visible from the appearance, and was inferior to the regularity, feel and fit of the wrinkles.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Comparative Example 3]
A composite laminate and a disposable diaper were produced in the same manner as in Example 1 except that the resin application method was changed to the curtain spray method and the resin application amount was 5 g / m ² per fabric area.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

[Comparative Example 4]
A composite laminate and a disposable diaper were produced in the same manner as in Example 5 except that the resin application method was changed to the curtain spray method and the resin application amount was 5 g / m ² per fabric area.

  Table 1 shows the specifications of the composite laminate, the determination results of the composite laminate, and the disposable diaper.

Claims (7)

A plurality of elastic fibers arranged in parallel in one direction between two fabrics;
A composite laminate having a resin extending in one direction arranged in a direction intersecting with elastic fibers,
Each of the two fabrics and the elastic fiber are spaced apart between the elastic fiber and the resin extending in one direction adjacent to the longitudinal direction of the elastic fiber,
A composite laminate in which the ratio of the fineness of the elastic fibers to the fineness of the fibers constituting the fabric is 0.5 or more and 300 or less. The composite laminate according to claim 1, wherein the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric is 0.5 or more and 200 or less. The composite laminate according to claim 1 or 2, wherein the color difference ΔE between the elastic fiber and the fabric is 10 or less. The thickness at the location where the elastic fiber and the resin extending in one direction intersect is 0.1 mm or more and 5.0 mm or less,
The composite laminate according to any one of claims 1 to 3, wherein the maximum value of the thickness between the portions adjacent to each other in the longitudinal direction of the elastic fiber is 1 mm or more and 20 mm or less. The width of the resin extending in one direction is 0.2 mm or more and 10 mm or less at the maximum extension,
The composite laminate according to any one of claims 1 to 4, wherein the distance between the resins is 1 mm or more and 20 mm or less at the maximum elongation. The composite laminate according to any one of claims 1 to 5, wherein the heat softening point of the elastic fiber is 100 ° C or higher and 240 ° C or lower. The composite laminate according to any one of claims 1 to 6, wherein a plurality of resins extending in one direction arranged in a direction intersecting with the elastic fibers include a fabric and / or a component of elastic fibers.