JPH081842A - Extensible composite - Google Patents

Abstract

PURPOSE:To obtain extensibility and elasticity in a well balanced state by attaching an extensible elastomer layer to one face or both faces of a uniaxially oriented body of thermoplastic resin or a filament network and letting directions of warp and weft of the network and a tension direction make a specified angle. CONSTITUTION:An extensible composite 11 is formed by attaching an extensible elastomer layer 12 on both faces of an unwoven cloth 7 as a network consisting of a longitudinally and uniaxially oriented netted film. In the extensible composite 11, an angle made by a uniaxially oriented body of thermoplastic resin or warp and weft directions of the network of filaments and a tension direction is set to 10-80 deg.. Also, it is desirable to set an angle made by the warp and weft directions and a molding direction of the elastomer layer 12 to 10-80 deg.. Further, when the warp is at 10-80 deg. clockwise with respect to the molding direction of the elastomer layer 12, it is preferable to layer the weft at 10-80 deg. counterclockwise. Also, an additive such as antistatic agent and crosslinking agent can be added to the uniaxially oriented body and the filament.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretchable composite and is widely used as a gather or a stopper for disposable diapers, clothing materials, gloves, shoe covers, hats, bandages, bandages and the like.

[0002]

2. Description of the Related Art Conventionally, sportswear used for skis, motor sports, marine sports, etc., base materials for clothes for work and surgery, work gloves used in the food industry, gathers for hats, arm bands, Various materials having functions such as elasticity and elasticity have been developed and used for applications such as hanging trousers, belts, poultice materials coated with a poultice, and diapers. Various techniques have been proposed to meet such requirements. For example, a method for obtaining an elastic composite by laminating a stretchable member having elasticity and a non-stretchable member forming a fold (Japanese Patent Laid-Open No. 59-59901, Japanese Laid-Open Patent Publication No. 62-33889, Japanese Patent Laid-Open No. 62-33889). 6-318
33, JP-A-6-31869, JP-A-6-
No. 47808), a method for producing a concavo-convex stretchable fabric by spot-bonding a stretchable fabric and a non-stretchable sheet (JP-A-63-92433), and a method for laminating a non-woven fabric and a rubber-like elastic yarn (JP-A No. JP-A-61-289163 and JP-A-3-213543), a method of laminating a polyurethane film and a polyurethane non-woven fabric (JP-A-62-1).
No. 21045, JP-A No. 62-162538), a method of obtaining a laminate having elasticity by laminating a specific thermoplastic rubber layer and a non-woven fabric (JP-A-3-158236), and the like.

[0003]

However, a waist stopper for disposable diapers, gathers for surgical and working clothes,
Caps used for food handling, cleaning, IC manufacturing, etc., fasteners such as gloves and shoe covers, and fasteners such as bandages and bandages have appropriate elasticity and elasticity. Is required. In the method of improving the stretchable and elastic composite found in the above-mentioned disclosed technique, a product that sufficiently satisfies these required properties, is easy to manufacture, and is economical is not obtained.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a specific thermoplastic resin-made uniaxially oriented body or a reticulated material composed of filaments and a stretchable elastomer are used. It was found that a stretchable composite having appropriate stretchability and elasticity can be obtained by laminating the above, and thus the present invention has been completed. That is, the present invention is one in which a stretchable elastomer layer is provided on one side or both sides of a reticulated product made of a uniaxially oriented body or filament made of a thermoplastic resin, and the warp and weft directions of the reticulated product and the tensile direction The angle is 10-80
And a stretchable composite body.

The present invention will be described in more detail below. As the uniaxially oriented body made of a thermoplastic resin used in the present invention, (a) a longitudinally uniaxially oriented reticulated film made of a thermoplastic resin, (b)
A non-woven fabric or a woven fabric in which at least one kind of uniaxially oriented body selected from a laterally uniaxially oriented reticulated film and (c) uniaxially oriented tape is laminated or woven so that the mutual orientation axes intersect at an angle of 20 to 90 °. Is used.

The longitudinally uniaxially oriented reticulated film (a) made from the above thermoplastic resin may be a single film, but preferably the first thermoplastic resin is provided on one side or both sides of the first thermoplastic resin layer. A multilayer film obtained by laminating a second thermoplastic resin layer having a lower melting point is stretched or rolled in a longitudinal uniaxial direction (molding direction of the film), and before and / or after stretching or rolling, for example, a longitudinal direction using a slitter. It is split into pieces. FIG. 2 is a partially enlarged perspective view of an example of (a) a vertically uniaxially oriented reticulated film. In the figure,
The longitudinally uniaxially oriented reticulated film 1 is obtained by laminating the second thermoplastic resin layer 3 on both surfaces of the first thermoplastic resin layer 2, stretching or rolling, and performing splitting treatment in the longitudinal direction. In the figure, 4 is a trunk fiber and 5 is a branch fiber. The (b) laterally uniaxially oriented reticulated film made of a thermoplastic resin is preferably a second thermoplastic resin having a lower melting point than that of the first thermoplastic resin, preferably on one surface or both surfaces of the first thermoplastic resin layer. A multilayer film obtained by laminating a resin layer, which is stretched or rolled in a lateral uniaxial direction (direction perpendicular to the film forming direction), and split in the lateral direction using, for example, a slitter before and / or after stretching or rolling. Is. FIG. 3 is a partially enlarged perspective view of an example of (b) a laterally uniaxially oriented reticulated film.
In the figure, the lateral uniaxially oriented reticulated film 6 is obtained by laminating the second thermoplastic resin layer 3 on both surfaces of the first thermoplastic resin layer 2, and then performing stretching or rolling and transverse splitting treatment. Is. Further, the (c) uniaxially oriented tape made of a thermoplastic resin is used to cut the first thermoplastic resin single film or the above-described film having, for example, a three-layer structure, and stretched before and / or after cutting. Alternatively, it is uniaxially oriented by rolling.

The first thermoplastic resin is a homopolymer of α-olefin such as high density and medium density polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, polyhexene-1, propylene-. Examples thereof include polyolefins such as α-olefin mutual copolymers such as ethylene copolymers, polyamides, polyesters, liquid crystal polyesters, polycarbonates, polyvinyl alcohols and the like.

The second thermoplastic resin having a melting point lower than that of the first thermoplastic resin includes high density, medium density and low density polyethylene, linear low density polyethylene, ultra low density polyethylene and ethylene-vinyl acetate copolymer. Copolymers; ethylene-acrylic acid ester copolymers such as ethylene-ethyl acrylate and ethylene-methacrylic acid ester copolymers such as ethylene-ethyl methacrylate; ethylene- (maleic acid or its ester) copolymers; polypropylene, propylene -Propylene-based polymers such as ethylene copolymers; and polyolefins modified with unsaturated carboxylic acids. For manufacturing reasons, the difference in melting point between the second thermoplastic resin and the first thermoplastic resin is preferably 5 ° C. or higher, more preferably 10 to 50 ° C. or higher.

Specific combinations of uniaxially oriented bodies in the nonwoven fabric or woven fabric used in the present invention include (1) as shown in FIG. 4, (a) nonwoven fabric 7 in which two longitudinal uniaxially oriented reticulated films 1 are laminated. , (2) (a) a nonwoven fabric in which a longitudinal uniaxially oriented reticulated film and (b) a lateral uniaxially oriented reticulated film are laminated, (3) as shown in FIG. 5, (c) uniaxially oriented tape 8
Nonwoven fabric 9 in which two sets of (4) are laminated, as shown in FIG.
(C) A woven fabric 10 obtained by weaving the uniaxially oriented tape 8 may be used. As a specific example of the net-like material composed of a uniaxially oriented body, "Nisseki Wallif" (trade name, manufactured by Nisseki Plast Co., Ltd.) can be mentioned.

Examples of the net-like material composed of filaments made of a thermoplastic resin used in the present invention include a net made of a thermoplastic resin made by intersecting warps and wefts and fusing at the intersections. As the thermoplastic resin, polyethylene, polypropylene, polyester, polyamide and the like are used, but polypropylene is most preferable. A specific example of the thermoplastic resin net is "Nisseki Conwet Net" (trade name, manufactured by Nisseki Sheet Pallet System Co., Ltd.).

Examples of the stretchable elastomer used in the present invention include thermoplastic elastomers, synthetic rubbers and natural rubbers.

Examples of the thermoplastic elastomer include polyolefin (TPO), polyamide, polystyrene, vinyl chloride, polyester and polyurethane elastomers. Of these, polyurethane-based thermoplastic elastomers are preferred.

The above-mentioned polyurethane thermoplastic elastomer is obtained by reacting an organic diisocyanate such as tolylene diisocyanate or p, p'-diphenylmethane diisocyanate with a low melting point polyol such as dihydroxypolyether or dihydroxypolyester and a chain extender. Examples include polymers.

Examples of the synthetic rubber include polyurethane rubber, ethylene propylene rubber, natural rubber, nitrile rubber and isobutylene rubber, and these may be used alone or as a mixture.

As the above ethylene propylene rubber,
Random copolymer (EPM) containing ethylene and propylene as main components, and diene monomer (dicyclopentadiene, ethylidene norbornene, etc.) as third component
Random copolymer (EPD)
M).

When the stretchable elastomer layer used in the present invention is prepared in advance, a film or sheet is formed by an inflation molding method by extrusion molding, a T-die method, a calendering method, a fluidized dipping method, a polyurethane solution casting method, or the like. Or a nonwoven fabric is produced by a spun bond method, a melt blow method, or the like.

In the present invention, a method for forming a stretchable elastomer layer on one side or both sides of a net-like material made of a thermoplastic resin uniaxially oriented body or filaments is as follows:
An extrusion laminating method, a bonding method using an adhesive, a fusion bonding method using heat and pressure, or the like is used. In the case of a polyurethane film prepared by casting 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 uniaxially oriented body or filament is laminated and heated and heated. A laminate can be obtained by applying pressure to cure the urethane adhesive. FIG. 1 is a partially enlarged sectional view of an example of the stretchable composite of the present invention. Stretchable composite 1
In No. 1, a stretchable elastomer layer 12 is provided on both surfaces of a non-woven fabric 7 which is (a) a mesh made of a longitudinally uniaxially oriented reticulated film. The cross section of the non-woven fabric 7 corresponds to the arrow I-I in FIG.

In producing the laminate as the composite of the present invention, it is preferable to preliminarily subject the reticular material comprising the uniaxially oriented body or the filament to a surface treatment in order to enhance the adhesiveness. Examples of the surface treatment include known corona discharge treatment, physical surface treatment such as plasma treatment and ultraviolet treatment, and chemical surface treatment such as solvent treatment. The wettability index of the surface-treated surface is preferably 40 dyne / cm or more.

In the stretchable composite of the present invention, the angle formed by the warp and weft directions of the net-like material made of a uniaxially oriented body or filament made of a thermoplastic resin and the pulling direction is 1.
The angle between the warp and weft directions and the direction in which the elastic elastomer layer is formed is preferably 10 to 80, although it is necessary to be 0 to 80. further,
When the warp yarn is 10 to 80 ° in the clockwise direction with respect to the forming direction of the stretchable elastomer layer, the weft yarns are more preferably laminated to be 10 to 80 ° in the counterclockwise direction.

In the present invention, an antistatic agent, an antifogging agent, an organic or inorganic filler, an antioxidant, a lubricant, an organic material is used for the reticulate material and the elastic elastomer layer made of a uniaxially oriented body or filament made of a thermoplastic resin. Alternatively, known additives such as an inorganic pigment, a UV inhibitor, a dispersant, a nucleating agent, a foaming agent, a flame retardant, and a cross-linking agent can be added to the extent that the characteristics of the invention are not essentially impaired.

[0021]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention. <Example 1> First, a multilayer film was formed as follows. In the film-forming process, high-density polyethylene (density = 0.956 g / cm ³ , M
FR = 1.0g / 10min, product name: Nisseki Staflen E71
0, manufactured by Nippon Petrochemical Co., Ltd., as a core layer, and adhesive layers on both sides of the core layer, low density polyethylene (density = 0.924 g / c)
m ³ , MFR = 3.0g / 10min, product name: Nisseki Lexron
F30, manufactured by Nippon Petrochemical Co., Ltd.) was laminated to produce a multi-layer film having a width of 90 cm and having a three-layer structure of adhesive layer 15 μm / core layer 100 μm / adhesive layer 15 μm. Next, in the stretching step, a uniaxially stretched film having a thickness of 40 μm and a width of 30 cm was uniaxially stretched in the longitudinal direction (molding direction) at a draw ratio of 9 times to produce a uniaxially stretched film, which is disclosed in Japanese Utility Model Publication No. 51-38979. After the fibers were split in the longitudinal direction using a fiber tool, they were expanded three times in the width direction to obtain (a) a vertically uniaxially oriented reticulated film. In the next laminating step, nonwoven fabric A was prepared by laminating the two obtained films by latitudinal and latituting so that the orientation axes intersect at an angle of 60 °. Next, after performing corona discharge treatment on both sides of the nonwoven fabric A, urethane-based thermoplastic elastomers each having a thickness of 20 μm were laminated by an extrusion laminating method.
At this time, the warp of the non-woven fabric A was laminated so that the warp was 30 ° in the clockwise direction and the weft was 30 ° in the counterclockwise direction with respect to the molding direction of the elastomer layer to obtain a stretchable composite as shown in FIG. .. The stretch ratio of the obtained elastic composite is 15 in the molding direction.
% And 50% in the perpendicular direction.

Example 2 A multilayer film was formed in the same manner as in Example 1, and in the stretching step, it was obtained by uniaxially stretching in the transverse direction (the direction perpendicular to the molding direction). (B) Transverse uniaxially oriented reticulated film Then, the nonwoven fabric B was produced by laminating the longitudinally uniaxially oriented reticulated film (a) used in Example 1 so that the orientation axes of both films intersect at an angle of 60 °. Then, in the same manner as in Example 1, each of 20
A urethane thermoplastic elastomer having a thickness of μm was laminated by an extrusion laminating method. At this time, the warp of the non-woven fabric B is rotated by 60 ° in the clockwise direction with respect to the molding direction of the elastomer layer,
The wefts were laminated so that the weft was 60 ° in the counterclockwise direction to obtain a unidirectionally stretchable composite. The elongation rate of the obtained stretchable composite is
It was 50% in the molding direction and 15% in the perpendicular direction.

<Example 3> Nonwoven fabric obtained by laminating (c) uniaxially oriented tape obtained by cutting a film uniaxially stretched in the machine direction so that the two sets of orientation axes intersect at an angle of 60 °. The same procedure as in Example 1 was carried out except that C was produced. The stretch ratio of the obtained stretchable composite was 15% in the molding direction and 50% in the perpendicular direction.

Example 4 A uniaxially oriented tape (c) obtained by cutting a film uniaxially stretched in the machine direction was woven by warp weaving such that the angles of the two sets of orientation axes intersect at 60 °. The same procedure as in Example 1 was carried out except that Fabric D was prepared. The stretch ratio of the obtained stretchable composite was 15% in the molding direction and 50% in the perpendicular direction.

[0025]

EFFECT OF THE INVENTION The stretchable composite of the present invention comprises a thermoplastic resin uniaxially oriented body or a reticulated body made of filaments, on one or both sides of which the warp and weft directions of the reticulated body and the molding direction of the stretchable elastomer layer are formed. By laminating the stretchable elastomer layer so that the angle between and is 10 to 80 °, it has a proper balance of stretchability and elasticity, and has an excellent effect which was not obtained by the conventional elastic composite. Have. Taking advantage of the above characteristics, waist diapers for disposable diapers, clothes for surgical operations and work, work involving food,
It can be widely used as a cap for use in cleaning work and IC manufacturing work, a stopper such as gloves and shoe covers, a stopper such as a plaster, a bandage and the like.

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view of an example of a stretchable composite of the present invention.

FIG. 2A is a partially enlarged perspective view of an example of a vertically uniaxially oriented reticulated film.

FIG. 3 (b) is a partially enlarged perspective view of an example of a laterally uniaxially oriented reticulated film.

FIG. 4 is a partial plan view of an example of a nonwoven fabric.

FIG. 5 is a partial plan view of another example of a nonwoven fabric.

FIG. 6 is a partial perspective view of an example of a woven cloth.

[Explanation of symbols]

 1 Longitudinal uniaxially oriented reticulated film 2 First thermoplastic resin layer 3 Second thermoplastic resin layer 6 Lateral uniaxially oriented reticulated film 7, 9 Nonwoven fabric 8 Uniaxially oriented tape 10 Woven fabric 11 Stretchable composite 12 Stretchable elastomer layer

Claims (2)

[Claims] 1. A stretchable elastomer layer is provided on one side or both sides of a net-like material made of a uniaxially oriented body or filament made of a thermoplastic resin, and the direction of the warp and weft of the net-like material and the direction of tension are formed. A stretchable composite having an angle of 10 to 80 °. 2. The reticulate material comprising a uniaxially oriented body made of a thermoplastic resin is at least one kind of uniaxially oriented body selected from the following (a), (b) and (c), and has a mutual orientation axis of 2
The stretchable composite according to claim 1, which is a thermoplastic resin non-woven fabric or woven fabric laminated or woven so as to intersect at an angle of 0 to 90 °, (a) longitudinal uniaxial orientation. Reticulated film (b) Horizontal uniaxially oriented reticulated film (c) Uniaxially oriented tape.