JP3366759B2 - Complex with restricted expansion and contraction direction - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite in which the direction of expansion and contraction is restricted, and more particularly, to at least two layers of a specific stretched long-fiber web and an elastic elastomer layer. The present invention relates to a composite formed by laminating layers and having a restricted expansion and contraction direction. Composites having such properties are widely used in disposable diapers, clothing materials, gloves, shoe covers, hats, accompanying plasters, bandages, joint tubes for pipes and electric wires, and the like. [0002] Conventionally, sportswear such as skis, motor sports and marine sports, base materials for clothing for work and surgery, work gloves, hat gathers and arm bands used in the food industry, etc. Various materials having functions such as elasticity and elasticity have been developed and used for applications such as hanging trousers, belts, cataplasms, and diapers.
Various techniques have been proposed to meet such demands. For example, a method of obtaining an elastic composite by laminating an elastic member having elasticity and a non-elastic member forming a fold (Japanese Unexamined Patent Application, First Publication No. H11-163873). JP-A-59-59901;
No. 33889, JP-A-6-31833, JP-A-6-31869, and JP-A-6-47808), a method for producing an uneven stretchable fabric by point-bonding a stretchable fabric and a non-stretchable sheet. (JP-A-63-924
No. 33), a method of laminating a nonwoven fabric and a rubbery elastic yarn (Japanese Patent Application Laid-Open No. 61-289163, Japanese Patent Application Laid-Open No. 3-213).
No. 543), a method of laminating a polyurethane film and a polyurethane nonwoven fabric (Japanese Patent Laid-Open Nos. 62-121045 and 62-162538), a method of laminating a specific thermoplastic rubber layer and a nonwoven fabric, and (Japanese Unexamined Patent Publication No. 3-158236). [0003] However, waist stoppers for disposable diapers; clothing for surgical operations and work; hats used for food handling work, cleaning work, IC manufacturing work, and the like; Gloves, shoe covers and other fasteners; accompanying plasters; bandages and other fasteners have good texture, moderate elasticity and elasticity, and are non-elastic in one direction and have mechanical strength It is required to be excellent. In the method for improving a composite having elasticity and elasticity found in the above-mentioned disclosed technology, in any case, those that sufficiently satisfy these required properties and are simple and economical have not been obtained. . The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a specific stretched long-fiber web made of a thermoplastic resin and a stretchable elastomer layer can be used. By laminating at least two layers, it is possible to obtain a complex having a good texture, moderate elasticity and elasticity, and non-elasticity in one direction, excellent mechanical strength, and a restricted elasticity direction. The present invention has been completed by finding that it can be formed. [0005] The present invention relates to a stretched long-fiber web obtained by stretching a long-fiber web formed by spinning a thermoplastic resin in one direction, and arranging the fibers of the web in substantially one direction; And a method for producing a composite in which the direction of expansion and contraction is regulated. Further, the present invention relates to a method for producing a composite having a restricted stretching direction, wherein the stretched long-fiber web has a draw ratio of 5 to 20 times and an average fineness of 0.01 to 10 denier. . Hereinafter, the present invention will be described in detail. The stretched long-fiber web of the present invention is a web containing long fibers in which most of the fibers stretched in the plane thereof are regularly arranged in one direction, or a stretched long-fiber web alone or
It may be a composite with another nonwoven fabric. As a specific example of a single unit of the drawn continuous fiber web, a continuous fiber web composed of an undrawn filament that can be drawn at a draw ratio of 2 or more, obtained by spinning a thermoplastic resin and applying a swirl or vibration with hot air. Is stretched in the longitudinal and / or transverse direction by a stretching method such as rolling by a rolling roll or the like, roll stretching, proximity stretching, tenter stretching, pulley stretching, hot plate stretching, or the like,
Next, a web formed by spinning a thermoplastic resin, stretching, opening, collecting and entangled in a substantially unidirectional manner, forming a web in a substantially unidirectional manner, and a long fiber bundle of a thermoplastic resin. The web is formed by stretching and crimping, opening and widening to form a web, and the web is formed by arranging the web in almost one direction, foaming and extruding a thermoplastic resin, foaming bursting, laminating and stretching to form a web. And those arranged in the direction. These drawn continuous fiber webs may be used in a plurality of layers. The draw ratio of the drawn continuous fiber web is 5 to 2
It is 0 times, preferably 8 to 12 times. The average fineness is selected from the range of 0.01 to 10 denier, preferably 0.01 to 5 denier, and the undrawn filament having the fineness of 0.2 to 50 denier is rolled or stretched to 0.01 to 1 denier.
Those having 0 denier are preferred. The basis weight of the drawn continuous fiber web varies depending on the use and purpose, but is generally selected from the range of 5 to 100 g / m ² . The thermoplastic resin as a raw material used in the present invention includes polyolefin resins such as polyethylene and polypropylene (PP), polyester resins, nylon resins, polyvinyl alcohol resins and the like. The elastic elastomer used in the present invention includes a thermoplastic elastomer, a synthetic rubber, a natural rubber and the like. Examples of the thermoplastic elastomer include olefin (TPO), polyamide (PA), styrene, vinyl chloride, polyester, and urethane elastomers. Of these, urethane-based thermoplastic elastomers are preferred. The urethane-based thermoplastic elastomer includes organic diisocyanates such as tolylene diisocyanate and p, p'-diphenylmethane diisocyanate;
Examples include polymers obtained by reaction with a low melting point polyol such as dihydroxy polyether and dihydroxy polyester and a chain extender. Examples of the synthetic rubber include polyurethane rubber, ethylene propylene rubber, natural rubber, nitrile rubber, isobutylene rubber and the like, and these can be used alone or as a mixture. As the above-mentioned ethylene propylene rubber,
A random copolymer (EPM) containing ethylene and propylene as main components, and a random copolymer (EPD) containing as a third component a diene monomer such as dicyclopentadiene or ethylidene norbornene as a main component
M). The stretchable elastomer layer used in the present invention may be a film or sheet obtained by an inflation method by extrusion molding, a T-die method, a calendering method, a fluid immersion method, a casting method of a polyurethane solution, or a spunbond method. An elastic nonwoven fabric by a melt blown method or the like can be used. In the present invention, as a method for forming a composite containing a stretched long-fiber web and a stretchable elastomer layer, an extrusion laminating method, a bonding method using an adhesive, a fusion method using heating and pressure, and the like are used. . When using a polyurethane film by a casting method of a polyurethane solution, an adhesive, preferably a urethane adhesive having a low degree of polymerization, is applied to the film obtained by the casting method, and then a stretched long fiber web is laminated and heated. The composite can be obtained by curing the urethane adhesive by applying pressure and pressure. The composite of the present invention may be combined with another base material as long as it contains a stretched long-fiber web and an elastic elastomer layer. For example, if the stretched long-fiber web is A, the stretchable elastomer layer is B, and the other substrate is X, as specific configurations, A / B, A / B / X,
A / X / B, X / A / B and the like. Other substrates X include polyethylene terephthalate (PET), PP, P
Spunbond nonwoven fabrics and meltblown nonwoven fabrics composed of various resins such as A; dry or wet nonwoven fabrics composed of artificial fibers such as PET, PA or rayon and natural fibers such as cotton and wool; and cloths, papers, rubber films, leathers and the like. Can be used. As a use of the composite of the present invention, for example, a material obtained by combining a stretched long-fiber web with a urethane-based elastomer nonwoven fabric is excellent in both air permeability and texture, so that it comes into contact with the skin and expands and contracts in only one direction. It is suitable for applications requiring properties, for example, disposable diaper bands, medical caps and gown sleeves, and knit clothing interlining. In addition, a composite obtained by combining a urethane-based elastomer nonwoven fabric with a stretched long-fiber web and another different base material can also be used. For example, like cloth or paper with gathers,
When combined with a base material that can be freely deformed simultaneously with expansion and contraction, it is possible to reinforce the direction perpendicular to the direction of expansion and contraction of the gathers, and to obtain a composite that does not change its shape in the horizontal direction during expansion and contraction. . In order to increase the adhesive strength when producing the composite of the present invention, it is preferable to apply a surface treatment to the drawn continuous fiber web in advance. Examples of the surface treatment include known surface treatments such as corona discharge treatment, plasma treatment, and ultraviolet treatment, and chemical surface treatments such as solvent treatment. The surface treated surface has a wetting index of 40 dyne / cm
It is preferable that it is above. In the present invention, an antistatic agent, an anti-fogging agent, an organic or inorganic filler, an antioxidant, a lubricant,
Known additives such as an organic or inorganic pigment, an ultraviolet absorber, a dispersant, a nucleating agent, a foaming agent, a flame retardant, and a crosslinking agent can be added within a range that does not substantially impair the characteristics of the present invention. . The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. First, a method for evaluating physical properties will be described. (1) Tensile test: Performed in accordance with JIS L1096,
A test piece having a width of 1 cm is used. (2) Drapability: According to the cantilever method described in JIS L1086. With the arrangement direction of the fibers in the stretched long fiber web of the sample as the length direction, a width of 2 cm and a length of 1
The test is performed by preparing five test pieces of 5 cm, and the scale at the time of contact with the slope of the cantilever is read. The smaller the value obtained, the more flexible and drapeable. (3) Feeling test: Performed by five monitors selected arbitrarily and evaluated according to the following criteria. ◎: Four or more monitors determined to have a good touch ○: Three monitors determined to have a good touch ×: Two or less monitors determined to have a good touch <Example 1> The drawn continuous fiber web was formed as follows. Long fiber in which spun filaments produced from polypropylene (trade name: Nisseki Polypro J120, manufactured by Nippon Petrochemical Co., Ltd.) are arranged by swirling with hot air and undrawn filaments having a fineness of 2 denier are arranged in the horizontal direction. Got the web. This web is disclosed in
No. 41922, the film is stretched 10 times in the transverse direction by a pulley-type transverse stretching method to a fineness of 0.2 denier, and temporarily bonded with polyvinyl alcohol to obtain a basis weight of 8
g / m ² transversely drawn continuous fiber web. Next, after performing corona discharge treatment on both sides of the obtained drawn continuous fiber web,
A urethane-based thermoplastic elastomer film having a thickness of 20 μm was laminated via an adhesive to obtain a composite whose expansion and contraction direction was regulated. The resulting composite had a stress at 100% elongation in the longitudinal direction of 100 g / cm 2, a maximum stress in the transverse direction of 1000 g / cm, and an elongation at that time (maximum elongation) of 7%. . The results are shown in Table 1 together with the results of the drapability and the feel test. <Example 2> After a corona discharge treatment was applied to both surfaces of the transversely stretched continuous fiber web obtained in Example 1, a film of a 20-μm-thick ethylene-propylene random copolymer rubber was put through an adhesive. To obtain a composite in which the direction of expansion and contraction was regulated. The resulting composite has a length of 100
The stress at% elongation was 160 g / cm 2, the maximum stress in the transverse direction was 1000 g / cm, and the maximum elongation was 7%. Table 1 shows the results. <Example 3> After applying corona discharge treatment to both sides of the transversely stretched continuous fiber web obtained in Example 1, a polyurethane spunbond nonwoven fabric having a basis weight of 25 g / m ² and a thickness of 0.12 mm ( Product Name: Espiancione UHO2
5, manufactured by Kanebo Co., Ltd.) via an adhesive to obtain a composite in which the direction of expansion and contraction was regulated. The resulting composite had a stress at 100% elongation in the machine direction of 80 g / cm 2, a maximum stress in the cross direction of 1000 g / cm, and a maximum elongation of 7%.
Table 1 shows the results. <Example 4> After applying corona discharge treatment to both surfaces of the transversely stretched long-fiber web obtained in Example 1, a polyurethane melt-blown nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 0.10 mm was bonded. The composite was laminated via the agent to obtain a composite in which the direction of expansion and contraction was regulated. The resulting composite had a stress at 100% elongation in the machine direction of 60 g / cm 2, a maximum stress in the cross direction of 1000 g / cm, and a maximum elongation of 7%.
Table 1 shows the results. <Comparative Example 1> A basis weight 25 used in Example 3
The measurement was performed in the same manner as described above for a spunbond nonwoven fabric made of polyurethane having a g / m ² and a thickness of 0.12 mm (trade name: Espinsione UHO25, manufactured by Kanebo Co., Ltd.). The stress at 100% elongation in the machine direction was 80 g / cm 3, and the stress at 100% elongation in the transverse direction was 40 g / cm 2. Table 1 shows the results. <Comparative Example 2> High-density polyethylene (trade name: Nisseki Staphrene E710, manufactured by Nippon Petrochemical Co., Ltd.)
A three-layer film in which low-density polyethylene (trade name: Nisseki Lexlon F30, manufactured by Nippon Petrochemical Co., Ltd.) is laminated on both sides of the film is stretched in the uniaxial direction, and is further split in the lateral direction by a slitter to uniaxially orientate. A reticulated film was produced. By laminating the horizontal uniaxially oriented reticulated film and the urethane-based elastomer film, a basis weight of 60 g /
A unidirectionally stretchable composite having m ² and a thickness of 0.8 mm was obtained. The stress at the time of 100% elongation in the longitudinal direction of the obtained composite was 80 g /
cm 2, and the maximum stress in the transverse direction was as high as 1500 g / cm (maximum elongation: 3%). However, it was hard, had poor texture, and had a poor feel. Table 1 shows the results. [Table 1] The composite of the present invention in which the direction of expansion and contraction is regulated has good texture and moderate expansion and contraction by laminating at least two layers of a specific stretched long fiber web and an elastic elastomer layer. It has excellent properties, is non-stretchable in one direction, and is excellent in mechanical strength, and can not be obtained with a conventional elastic composite. Utilizing these characteristics, waist stoppers for disposable diapers; clothing for surgical operation and work; stoppers for hats, gloves, shoe covers, etc. used in food handling work, cleaning work, IC manufacturing work, etc. It can be widely used as a bandage or other fastener.

Continuation of the front page (56) References JP-A-3-158236 (JP, A) JP-A-3-57627 (JP, A) JP-A-5-59655 (JP, A) JP-A-5-261130 (JP) JP-A-53-38767 (JP, A) JP-A-1-140930 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 D04H 1/00-18/00 EUROPAT (QUESTEL) WPI / L (QUESTEL)

Claims (1)

(57) [Claims] 1. A method for producing a composite in which the direction of expansion and contraction is regulated, comprising the following steps. 1) A step of forming a long fiber web by arranging the spun undrawn filaments in one direction by turning or vibrating the thermoplastic resin with hot air , 2) further stretching the long fiber web in the arrangement direction by 5%. A step of stretching by 20 to 20 times to form a drawn continuous fiber web having an average fineness of 0.01 to 10 denier, and 3) a step of laminating the drawn continuous fiber web and a stretchable elastomer layer.