JP2009126000A - Stretch layered body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stretch layered body which has excellent stretching properties and flexibility, has sufficient strength, can adjust waterproofness and gas barrier property and is excellent in anti-stripping properties. <P>SOLUTION: The stretch layered body is prepared by laminating: an stretch nonwoven fabric made of a mixture of at least one kind of thermoplastic elastomer component (A) selected from elastomeric polypropylene, propylene-ethylene copolymer and a homopolypropylene resin (B); and an stretch film made of at least one kind of thermoplastic elastomer component (C) selected from elastomeric polypropylene and a propylene-ethylene copolymer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a stretchable laminate in which a polyolefin-based thermoplastic elastomer stretchable nonwoven fabric and a polyolefin-based thermoplastic elastomer stretchable film are laminated. For example, the present invention relates to a stretchable laminate that can be used as a material for various articles such as clean room gloves, first aid adhesives, medical patches, and transdermal absorption agents.

In recent years, non-woven fabrics with excellent elasticity have been developed, including gloves for clean rooms, emergency bandages,
It is used as a material for products that require fit, adhesion, etc., such as medical patches and transdermal drugs. Nonwoven fabrics are generally inferior in waterproofness and gas barrier properties due to their structure, and therefore it is desired to provide waterproofness and gas barrier properties in addition to the stretchability as described above. Conventionally, they are excellent in waterproofness and gas barrier properties. A waterproof resin and a gas barrier property are imparted by laminating a synthetic resin film on a nonwoven fabric.

However, if a non-stretchable synthetic resin film is simply laminated on the surface of a nonwoven fabric excellent in stretchability using a binder such as an adhesive, the stretchability inherent in the nonwoven fabric is impaired, and the fit and adhesion are reduced. There is a problem that it is not suitable for use as a material of a product that requires such as

Moreover, in the case of the nonwoven fabric excellent in the above-mentioned stretchability, the laminated synthetic resin film peeled off from the nonwoven fabric while the nonwoven fabric itself repeatedly expanded and contracted, resulting in poor durability.

On the other hand, Patent Document 1 discloses that a film made of a polyolefin-based elastomer is laminated and integrated by a dry laminating method using an adhesive on a non-woven fabric having elasticity using latent crimped fibers made of polyester. ing.
However, the elongation of the laminate integrated was less than 200%, and the fit and adhesion were inferior.

JP 2005-162638 A

An object of the present invention is to provide a stretchable laminate having excellent stretchability and flexibility, capable of adjusting waterproofness and gas barrier properties, and having sufficient strength and peeling resistance (durability). It is to provide.

As a result of earnest research to solve the above problems, a stretchable nonwoven fabric composed of a thermoplastic elastomer component composed of a propylene / ethylene copolymer and a homopolypropylene resin, and a thermoplastic elastomer composed of a propylene / ethylene copolymer The present inventors have found that a stretchable laminate obtained by laminating a polyolefin stretchable film composed of components has excellent stretchability and flexibility, and completed the present invention. The present invention is constituted as follows.
(1) An elastic nonwoven fabric comprising a mixture of at least one thermoplastic elastomer component (A) selected from elastomeric polypropylene and propylene / ethylene copolymer and homopolypropylene resin (B), elastomeric polypropylene, propylene / ethylene A stretchable laminate obtained by laminating a polyolefin stretchable film made of at least one thermoplastic elastomer component (C) selected from copolymers.
(2) The stretchable laminate according to (1), wherein the mixing weight ratio [(A) / (B)] of the thermoplastic elastomer component (A) and the homopolypropylene resin (B) is 50/50 to 95/5.
(3) The stretchable laminate according to (1) or (2), wherein the stretchable film comprises a mixture of the thermoplastic elastomer component (C) and the homopolypropylene resin (D).
(4) The stretchable laminate according to (3), wherein the mixing weight ratio [(C) / (D)] of the thermoplastic elastomer component (C) and the homopolypropylene resin (D) is 50/50 to 95/5.
(5) The MFR value of the thermoplastic elastomer component (A) is 50 to 400 g / 10 minutes, and the MFR value of the homopolypropylene resin (B) is 25 to 200 g / 10 minutes (1) to (4)
The stretchable laminate according to any one of the above.
(6) The MFR value of the thermoplastic elastomer component (C) is 30 g / 10 min or less (1),
(2) or (5) The stretchable laminate according to any one of the above.
(7) The MFR value of the thermoplastic elastomer component (C) is 30 g / 10 min or less, and the MFR value of the homopolypropylene resin (D) is 30 g / 10 min or less (3) to (5) The stretchable laminate described.
(8) The stretchable nonwoven fabric and the stretchable film are formed by point-like melt bonding.
The stretchable laminate described in 1.
(9) The stretchable laminate according to any one of (1) to (8), wherein the elongation at break is 200% or more.

Since the stretchable laminate of the present invention has a laminate of a polyolefin-based thermoplastic elastomer stretchable nonwoven fabric having excellent stretchability and a polyolefin-based thermoplastic elastomer stretchable film, the stretchable laminate as a whole is excellent. Stretchability and flexibility are ensured, and waterproof and gas barrier properties can be adjusted.
Moreover, the stretchable laminate of the present invention has sufficient strength and excellent peel resistance. Therefore, it is useful as a material for products that require fit, adhesion, and the like.

Hereinafter, the present invention will be described in detail.
First, the stretchable nonwoven fabric of the stretchable laminate of the present invention will be described.
The stretchable nonwoven fabric according to the present invention is an olefinic thermoplastic elastomer fiber comprising a mixture of at least one thermoplastic elastomer component (A) and a homopolypropylene resin (B) selected from elastomeric polypropylene and a propylene / ethylene copolymer. (Filaments) are laminated and their contact points are joined by self-fusion.

The MFR value of the thermoplastic elastomer component (A) is preferably 50 to 400 g / 10 minutes.
The density is preferably 0.85 g / cm ³ or more and less than 0.89 g / cm ³ . Within this range, a stretchable nonwoven fabric having excellent productivity and good stretchability, flexibility, strength, texture and the like can be obtained.

The elastomeric polypropylene used in the present invention is a polypropylene having a stereo block structure in which a polymer chain is composed of crystalline isotactic polypropylene or syndiotactic polypropylene and amorphous atactic polypropylene. It has a structure having isotactic polypropylene or syndiotactic polypropylene in the hard segment and atactic polypropylene in the soft segment.

Elastomeric polypropylene includes homopolymers and copolymers, which in addition to propylene units, other olefin units other than propylene units in the molecule, for example,
It contains ethylene, butylene, pentene or hexene units. These have a substantially stereoregular block sequence in the chain structure and consist of, for example, isotactic polypropylene and atactic polypropylene ordered blocks selectively arranged in the polymer chain.
The elastomeric polypropylene is produced by polymerizing or copolymerizing propylene or a catalytic reaction of propylene with another α-olefin.

The propylene / ethylene copolymer used in the present invention is a propylene / ethylene random copolymer or a propylene / ethylene block copolymer, or a propylene / ethylene random copolymer and a propylene / ethylene block copolymer. It is a mixture. The propylene content is preferably 70 mol% or more.
The propylene / ethylene block copolymer is not a polypropylene, polyethylene, or poly (ethylene-co-propylene) blend, but a polypropylene segment, a polyethylene segment, or a poly (ethylene-co-propylene) segment. Are appropriately chemically bonded (covalently bonded).

The homopolypropylene resin (B) used in the present invention is a polypropylene homopolymer.
The MFR value of the homopolypropylene resin (B) is preferably 25 to 200 g / 10 minutes. The density is preferably 0.89 to 0.92 g / cm ³ . Within this range, a stretchable nonwoven fabric excellent in productivity and excellent in anti-sticking performance of the nonwoven fabric can be obtained.

The mixing weight ratio [(A) / (B)] of the thermoplastic elastomer component (A) and the homopolypropylene resin (B) constituting the stretchable nonwoven fabric according to the present invention is preferably 50/50 to 95/5. More preferably, it is 60 / 40-90 / 10. Thermoplastic elastomer component (
A) contributes to the stretchability and recoverability of the nonwoven fabric, and the homopolypropylene resin (B) contributes to imparting the strength, elongation stress, and anti-sticking property of the nonwoven fabric. In particular, when the content of the homopolypropylene resin (B) in the nonwoven fabric is increased, the strength of the stretchable fibers constituting the nonwoven fabric is improved.
The recoverability is hindered, and the web formation of the nonwoven fabric tends to deteriorate because the adhesion between the fibers decreases. On the other hand, when the content of the homopolypropylene resin (B) in the nonwoven fabric decreases, the strength of the nonwoven fabric becomes insufficient, and the nonwoven fabric becomes sticky, which tends to cause a problem in handling.

Moreover, the ratio [MFR (A) / MFR (B)] of each resin component when the thermoplastic elastomer component (A) and the homopolypropylene resin (B) are mixed and used is 1 to
10 is preferable. If it is within this range, the compatibility of the respective resins at the time of heat melting is good, and the operability of the nonwoven fabric production is excellent.

In the mixture consisting of the thermoplastic elastomer component (A) and the homopolypropylene resin (B) used in the production of the stretchable nonwoven fabric according to the present invention, hindered phenol-based, various amine-based antioxidants, if necessary, Benzotriazole-based, hindered amine-based UV absorbers, amide wax, montanic acid wax and other smoothing agents, various carbodiimide compounds and other hydrolysis inhibitors, titanium oxide and other matting agents, Bengala and other pigments, coloring agents, yellow Anti-change agent,
An antifungal agent, an antibacterial agent, and other various improving agents may be added and blended.

Examples of the method for producing a stretchable nonwoven fabric according to the present invention include a production method in which a raw material resin such as a known spunbond spinning method or melt blow spinning method is melted and then formed into a nonwoven fabric and produced according to any method. May be. In particular, a melt blow spinning method is preferred in terms of stretchability and flexibility of the resulting nonwoven fabric.

A general method of melt blow spinning will be described as follows. The mixture is melted with an extruder, and the molten polymer is measured with a gear pump, and then discharged from spinning nozzle holes arranged in a row. A high-temperature heated gas is jetted at high speed from slits arranged on both sides of the nozzle hole, and the polymer extruded from the nozzle hole is thinned and cooled by the high-speed gas flow to form a continuous filament. The thinned filaments are separated from the gas stream on the moving conveyor net collection device and are laminated onto the net without being substantially focused. The contact points of the laminated filaments are joined by fusion in a state of being laminated by the heat of the self. You may make it join by heating and pressurizing using a roller etc. before or after cooling solidification after lamination on a collection device. In order to strengthen the bonding at the contact points between the filaments, the distance from the spinning nozzle to the position where the filaments are stacked on the collecting device should not be too long, and should be set to 10 to 100 cm. A gas flow guiding passage may be provided between the nozzle and the collecting device, but it may be omitted.

In the stretchable nonwoven fabric according to the present invention, it is preferable that the constituent filaments are opened and laminated without substantially joining and concentrating along the fiber longitudinal direction. This is because if the filaments are joined and fused in a bundled state without being opened, the uniformity of the nonwoven fabric is lowered and the flexibility is significantly impaired.

The average fiber diameter of the filament which comprises the nonwoven fabric of this invention is 5-50 micrometers normally, Preferably it is 10-30 micrometers. The fiber diameter may vary,
Even in the maximum case, it is preferably 70 μm or less. This is because the nonwoven fabric becomes rough and rigid as the fiber diameter increases. Also, the basis weight of the nonwoven fabric is preferably 20 to 200 g / ^{m 2,} more preferably from 30 to 100 g / ^{m 2.}
Moreover, the thickness of the nonwoven fabric is preferably 0.05 to 2.0 mm, more preferably 0.1 to 1.mm.
0 mm.

As described above, the stretchable nonwoven fabric according to the present invention is formed by laminating filaments, and the contact points between filaments constituting the laminate are joined by the filaments themselves.
Such a bonded state can be achieved by fusing the filaments together by heat. A method using a solvent or a method using another adhesive is not preferable because it reduces the flexibility of the nonwoven fabric.

In addition, the stretchable nonwoven fabric according to the present invention has a great feature in that it has good elongation and recovery rate, and has excellent stretchability. Specifically showing the stretch performance of the stretchable nonwoven fabric, the breaking strength per unit weight (g / m ² ) is 0.05 N or more, the breaking elongation is 200% or more, and the recovery rate at 100% elongation is 70% or more. It is preferable that Further, the elongation at break is 300% or more, 100
The recovery rate at% elongation is more preferably 75% or more.

The breaking strength, breaking elongation, and elongation recovery rate of the stretchable nonwoven fabric vary depending on the adhesive strength between the contact points of the filaments constituting the stretchable nonwoven fabric, but this stretchable nonwoven fabric is excellent as described above. The fact that the rupture strength, the rupture elongation, and the elongation recovery rate are sufficient indicates that the contact points are sufficiently joined.

Next, the stretchable film in the stretchable laminate of the present invention will be described.

The stretchable film according to the present invention comprises at least one thermoplastic elastomer component (C) selected from elastomeric polypropylene and a propylene / ethylene copolymer.

The MFR value of the thermoplastic elastomer component (C) is preferably 30 g / 10 min or less. The density is preferably 0.85 g / cm ³ or more and less than 0.89 g / cm ³ . Within this range, a stretchable film having excellent productivity and good stretchability, strength, texture and the like can be obtained.

The elastomeric polypropylene used in the present invention is a polypropylene having a stereo block structure in which a polymer chain is composed of crystalline isotactic polypropylene or syndiotactic polypropylene and amorphous atactic polypropylene.
It has a structure having isotactic polypropylene or syndiotactic polypropylene in the hard segment and atactic polypropylene in the soft segment.

Elastomeric polypropylene includes homopolymers and copolymers, which in addition to propylene units, other olefin units other than propylene units in the molecule, for example,
It contains ethylene, butylene, pentene or hexene units. These have a substantially stereoregular block sequence in the chain structure and consist of, for example, isotactic polypropylene and atactic polypropylene ordered blocks selectively arranged in the polymer chain.
The elastomeric polypropylene is produced by polymerizing or copolymerizing propylene or a catalytic reaction of propylene with another α-olefin.

The propylene / ethylene copolymer used in the present invention is a propylene / ethylene random copolymer or a propylene / ethylene block copolymer, or a propylene / ethylene random copolymer and a propylene / ethylene block copolymer. It is a mixture. The propylene content is preferably 70 mol% or more.
The propylene / ethylene block copolymer used in the present invention does not exist in the state of blend of polypropylene, polyethylene, and poly (ethylene-co-propylene), but includes propylene segment, ethylene segment, poly (ethylene-co -Propylene) A propylene / ethylene copolymer in which segments are appropriately chemically bonded (covalently bonded).

You may mix | blend an inorganic filler with the said thermoplastic elastomer component (C). As the inorganic filler, inorganic compounds usually used as plastic compounding agents such as silica, calcium carbonate, magnesium hydroxide and talc can be used. Incorporation of an inorganic filler is an effective means for preventing blocking and improving slipperiness when formed into a film. As a compounding ratio, Preferably it is 1 to 20 weight% with respect to the resin component weight for films, More preferably, it mix | blends in the range of 2 to 15 weight%.

In the stretchable film according to the present invention, the thermoplastic elastomer component (C)
When the homopolypropylene resin (D) is blended and used, it is effective in preventing blocking when it is used as a film.
The MFR value of the homopolypropylene resin (D) is preferably 30 g / 10 min or less. Density is 0.
89-0.92 g / cm < ³ > is preferable. Within this range, a stretchable film excellent in productivity and excellent in anti-sticking performance of the film can be obtained.
Mixing weight ratio of thermoplastic elastomer component (C) and homopolypropylene resin (D) [(C
) / (D)] is preferably 50/50 to 95/5, more preferably 60/40 to 90 /.
10.

In addition, hindered phenol-based, various amine-based antioxidants, benzotriazole-based, hindered amine-based UV absorbers, smoothing agents such as amide wax and montanic acid wax, and hydrolysis inhibitors such as various carbodiimide compounds as necessary. Further, matting agents such as titanium oxide, various pigments such as bengara, colorants, yellowing prevention agents, antifungal agents, antibacterial agents, and other various improving agents may be added and blended.

The thickness of the stretchable film is preferably 3 to 200 μm, more preferably 5 to 100 μm.
Especially preferably, it is 10-50 micrometers. Specifically showing the performance of the stretchable film, the breaking strength per unit weight (g / m ² ) is 0.1 N or more, the breaking elongation is 200% or more, 100%.
It is preferable that the recovery rate during elongation is 70% or more. Further, the elongation at break is 300% or more,
The recovery rate at 100% elongation is more preferably 75% or more.
The stretchable film can be used after being stretched as necessary.

The production method of the stretchable film in the present invention can be produced by a conventional film forming method. Specifically, it can be produced by ordinary T-die film molding, inflation molding, extrusion molding or the like.

The stretchable laminate of the stretchable nonwoven fabric and stretchable film of the present invention is a method of thermally bonding a stretchable film produced by T-die film molding, inflation molding, extrusion molding or the like with a hot embossing roll, It can be produced according to a method of spot fusion bonding using a hot roll or the like, a method of heat bonding using a hot melt adhesive, or an extrusion lamination molding method in which a film is molded and laminated with a nonwoven fabric at the same time.

When a stretchable film is laminated on a stretchable nonwoven fabric, the stretchable film may be heated to 80 to 130 ° C. and directly melt bonded to the stretchable nonwoven fabric. The stretchable nonwoven fabric having the composition described above and the stretchable film having the composition described above are close to each other within the range of 70 to 120 ° C. and have good compatibility with each other. As a result, an extremely high adhesive strength can be ensured.

In the case of manufacturing by dot-like melt bonding, the hole diameter is 200 to 500 μm and the number of holes is 500,000 to 100
It is preferable to melt and bond so that the number of dots is 10,000 / m ² . When the hole diameter is 200 μm or less, or when the number of holes is 500,000 / m ² or less, melt adhesion is insufficient, and when the hole diameter is 500 μm or more, or the number of holes is 1,000,000 / m ² or more. Adhesion is sufficiently performed, but tackiness after adhesion tends to occur, which tends to be a problem in unraveling the stretchable laminate.
In the point melt adhesion, it is possible to form a microhole in the stretchable laminate of the stretchable nonwoven fabric and the stretchable film, and it is possible to adjust the air permeability and moisture permeability of the stretchable laminate.

Since the stretchable nonwoven fabric and stretchable film according to the present invention have extremely excellent stretchability and flexibility, by laminating them, extremely excellent stretchability and flexibility are ensured. It becomes a stretchable laminate capable of adjusting waterproofness and gas barrier property. In addition, because the stretchability (breaking elongation and elongation recovery rate) of both is very similar, the stretchable laminate in which both layers are laminated by melt bonding has good followability during stretching, Even if it repeats, it hardly peels.

Specifically showing the performance of the stretchable laminate of the present invention, the breaking strength per unit weight (g / m ² ) is 0.1 N or more, the breaking elongation is 200% or more, and the recovery rate at 100% elongation is It is preferable that it is 70% or more. In addition, the elongation at break is 300% or more, and the recovery rate at 100% elongation is 75%.
More preferably.
The thickness of the stretchable laminate is preferably 0.05 to 2.0 mm, more preferably 0.1.
-1.0 mm.
Moreover, the stretchable laminate obtained as described above may be subjected to processing such as corona treatment on the nonwoven fabric surface and the film surface as necessary.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples. Evaluation of the stretchable nonwoven fabric, stretchable film and stretchable laminate in the description of the examples was carried out by the following method.

MFR measurement of resin: Measurement of melt flow rate (MFR) Measured at 230 ° C. and a load of 21.2 N in accordance with JIS K 7210.

Average fiber diameter of nonwoven fabric: Using a scanning electron microscope (SEM), a 500-fold magnified photograph of the nonwoven fabric surface was taken, the diameter of 50 fibers was measured, and the average value was taken as the average fiber diameter.

Fabric weight and thickness of nonwoven fabric, film and laminate: Measured in accordance with JIS L1906 “General long fiber nonwoven fabric test method”. For the basis weight, a 100 × 100 mm test piece was sampled, and the weight was measured and converted per 1 m ² . Thickness is dial thickness gauge (manufactured by Ozaki Seisakusho)
It measured using.

Breaking strength and breaking elongation of nonwoven fabric and laminate: Measured according to JIS L1906 “Testing method for general long-fiber nonwoven fabric”. A test piece having a width of 25 mm and a length of 200 mm was collected, and using a tensile tester (Orientec), the distance between the chucks was set to 100 mm and the test piece was fixed. Elongated at a pulling speed of 300 mm / min, the test piece is 1 cm wide at break and 1 g / m ²
The breaking strength and breaking elongation per (unit weight) were measured.

Elongation recovery rate of nonwoven fabric and laminate: Measured according to JIS L1096 “General Textile Test Method”. However, the evaluation in the present invention is a recovery rate at an elongation of 100%, a width of 25 mm,
A test piece having a length of 200 mm was collected, and using a tensile tester (Orientec), the distance between chucks was set to 100 mm and the test piece was fixed. After extending to 100% at a pulling speed of 300 mm / min, the crosshead was returned to its original position at the same speed as when it was extended, and the stress applied to the nonwoven fabric was set to zero. It was extended to 100% again at the same speed, and the extended length of the nonwoven fabric when the stress load started again was defined as Lmm. The elongation recovery rate was determined according to the following formula.
Elongation recovery rate (%) = ((100−L) / 100) × 100

Air permeability: Measured according to the fragile method of JIS L1906 “Testing method for general long-fiber nonwoven fabric”. A test piece of about 200 × 200 mm is collected and a breathability tester (TEXTTEST).
).

Film breaking strength and breaking elongation: Measured in accordance with JIS L1096 “General Textile Testing Method”. A test piece having a width of 25 mm and a length of 200 mm was collected, and using a tensile tester (Orientec), the distance between the chucks was set to 100 mm and the test piece was fixed. Tensile speed 30
The test piece was stretched at 0 mm / min, and the breaking strength and breaking elongation per 1 cm width and 1 g / m ² (unit weight) at the time of breaking were measured.

Elongation recovery rate of film: Measured according to JIS L1096 “General Textile Test Method”. However, the evaluation in the present invention is a recovery rate at an elongation of 100%, a width of 25 mm, and a length of 20
A test piece of 0 mm was collected and 10 mm between the chucks using a tensile tester (Orientec).
The test piece was fixed at 0 mm. After extending to 100% at a pulling speed of 300 mm / min, the crosshead was returned to its original position at the same speed as when it was extended, and the stress applied to the nonwoven fabric was set to zero. It was extended to 100% again at the same speed, and the extended length of the nonwoven fabric when the stress load started again was defined as Lmm. The elongation recovery rate was determined according to the following formula.
Elongation recovery rate (%) = ((100−L) / 100) × 100

[Example 1]
(Elastic nonwoven fabric)
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200, density 0.867) (A) and homopolypropylene resin (Idemitsu Petrochemical Y-6005GM, M
FR = 60, density 0.900) (B) was mixed at a weight ratio of 80/20 and dry blended in a dry state. This mixed pellet was melt-kneaded with an extruder at 220 ° C., weighed with a gear pump, and discharged from a melt-blow nozzle in which holes with a diameter of 0.5 mm were arranged in a row at a pitch of 2 mm, and 0.3 g / min per hole of the nozzle. A polymer is extruded under discharge conditions, and a filament is formed by thinning and solidifying with heated air (235 ° C.) blown from both sides of the nozzle, and this filament is sprayed onto a moving conveyor net located 20 cm away from the nozzle. A nonwoven fabric having a basis weight of 50.0 g / m ² , a thickness of 0.30 mm, and an average fiber diameter of 22 μm was obtained. The spinning temperature was 220 ° C. and the spinning situation was good.
The properties of the nonwoven fabric are breaking strength 4.1N, breaking elongation 502%, elongation recovery rate 82%, air permeability 180
It was cm ³ / cm ² / sec.

(Elastic film inflation molding)
A stretchable film was produced using an inflation molded film manufacturing apparatus. Propylene / ethylene copolymer (VM1100 manufactured by ExxonMobil, MFR = 3.0, density 0.8
60) (C) and calcium carbonate (made of calcium Shiroishi, average particle size as an inorganic filler)
2 μm) with respect to the resin weight, and after dry blending in a dry state, using a 40 mm extruder equipped with a spiral die having a die diameter of 100 mm, a molding temperature of 210 ° C.,
A film having a thickness of 25 μm was molded under the conditions of a resin extrusion rate of 20 kg / h and a blow-up ratio of 3.0.
The physical properties of the film were a breaking strength of 4.0 N, a breaking elongation of 497%, and an elongation recovery rate of 80%.

(Film lamination)
Thermal lamination of the stretchable film and the stretchable nonwoven fabric was performed using an embossed hot roll apparatus. That is, the elastic nonwoven fabric is preheated with a heating roll having a surface temperature of 90 ° C., combined with the elastic film, and fed to a dielectric hot pressing flat roll whose film side is set to 120 ° C. at a line speed of 10 m / min. Lamination was performed and wound on a winding roll.
Table 1 shows the physical property values of the obtained stretchable laminate.
This stretch laminate is made by melt-bonding a polyolefin stretch nonwoven fabric excellent in stretch performance and a polyolefin stretch film, so that both stretch properties are maintained as they are, and stretch properties are maintained. It can be said that the excellent waterproof performance of the film is imparted to the stretchable nonwoven fabric.

[Example 2]
(Elastic nonwoven fabric)
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200, density 0.867) and homopolypropylene resin (Idemitsu Petrochemical Y-6005GM, MFR =
60, density 0.900) at a weight ratio of 80/20 and dry blended in a dry state. This mixed pellet was melt kneaded with an extruder at 220 ° C., weighed with a gear pump, and a diameter of 0.
5mm holes are ejected from a melt blow nozzle arranged in a row at 2mm pitch.
A polymer is extruded under a discharge condition of 0.45 g / min per hole, and a filament is formed by thinning and solidifying with heated air (235 ° C.) blown from both sides of the nozzle, and this filament is positioned 20 cm away from the nozzle. A nonwoven fabric having a basis weight of 75.0 g / m ² , a thickness of 0.40 mm, and an average fiber diameter of 22 μm was obtained by spraying on a certain moving conveyor net.
The spinning temperature was 220 ° C. and the spinning situation was good.
The properties of the nonwoven fabric are breaking strength 7.0N, breaking elongation 400%, elongation recovery rate 80%, air permeability 110
It was cm ³ / cm ² / sec.
(Elastic film extrusion lamination)
Propylene / ethylene copolymer (ExxonMobil VM1100, MFR = 3.0, density 0.860) and homopolypropylene resin (ExxonMobil PP4152F2, MF)
R = 2.0, density 0.900) at a weight ratio of 95/5 and dry blended in a dry state. The pellets were extruded at 220 ° C. using a T die having a lip opening of 0.6 mm and a width of 500 mm attached to an extruder having a screw diameter of 40 mmφ and L / D = 28.
The stretchable nonwoven fabric is fed out at 10 m / min, guided between nip rolls and cooling rolls with a diameter of 350 mmφ through which water of 25 ° C. circulates, and laminated on the extruded stretchable film,
An elastic laminate was produced.
Table 1 shows the physical property values of the obtained stretchable laminate.
Similarly to Example 1, the obtained stretch laminate has the stretch performance inherently possessed by both the polyolefin stretch film excellent in stretch performance and the polyolefin stretch nonwoven fabric by direct melt bonding. It can be said that the polyolefin-based stretchable nonwoven fabric is provided with the excellent waterproof performance of the polyolefin-based stretchable film.

[Example 3]
(Elastic nonwoven fabric)
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200, density 0.867) and homopolypropylene resin (Idemitsu Petrochemical Y-6005GM, MFR =
60 and density 0.900) were mixed at a weight ratio of 50/50, and a non-woven fabric was produced in the same manner as in Example 1 except that dry blending was performed in a dry state. Weight per unit area 50.0 g / m ² , thickness 0.31
A nonwoven fabric having a diameter of mm and an average fiber diameter of 22 μm was obtained. The spinning temperature was 225 ° C., and the spinning situation was good.
Nonwoven fabric properties are breaking strength 4.8N, breaking elongation 480%, elongation recovery rate 78%, air permeability 175
It was cm ³ / cm ² / sec.
In the same manner as in Example 1, a propylene / ethylene copolymer (VM1100 manufactured by ExxonMobil,
Film lamination with a stretchable film comprising MFR = 3.0, density 0.860) was performed. Lamination was performed at a thermocompression flat roll temperature of 120 ° C. and a line speed of 10 m / min.
Table 1 shows the physical property values of the obtained stretchable laminate.

[Example 4]
(Elastic nonwoven fabric)
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200, density 0.867) and homopolypropylene resin (Idemitsu Petrochemical Y-6005GM, MFR =
Example 1 except that 60) is mixed at a weight ratio of 40/60 and dry blended in a dry state.
A nonwoven fabric was prepared in the same manner as described above. A nonwoven fabric having a basis weight of 50.0 g / m 2, a thickness of 0.32 mm, and an average fiber diameter of 22 μm was obtained. The spinning temperature was 230 ° C., and the spinning situation was good. The physical properties of the nonwoven fabric are breaking strength 5.8N, breaking elongation 350%, elongation recovery rate 72%, air permeability 180 cm ³ /
cm ² / sec.
Propylene / ethylene copolymer (VM110 manufactured by ExxonMobil) in the same manner as in Example 1.
Film lamination with a stretchable film of 0, MFR = 3.0, density 0.900) was performed. Lamination was performed at a thermocompression flat roll temperature of 120 ° C. and a line speed of 10 m / min.
Table 1 shows the physical property values of the obtained stretchable laminate.

[Example 5]
(Polyolefin stretch nonwoven fabric)
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200, density 0.867) and polypropylene resin (Idemitsu Petrochemical Y-6005GM, MFR = 60)
, Density 0.900) was mixed at a weight ratio of 80/20, and a non-woven fabric was prepared in the same manner as in Example 1 except that dry blending was performed in a dry state. Weight per unit area 50.0 g / m ² , thickness 0.30 mm,
A nonwoven fabric having an average fiber diameter of 22 μm was obtained. The spinning temperature was 220 ° C. and the spinning situation was good.
The properties of the nonwoven fabric are breaking strength 4.1N, breaking elongation 502%, elongation recovery rate 82%, air permeability 180
It was cm ³ / cm ² / sec.
Propylene / ethylene copolymer (V made by ExxonMobil) obtained in the same manner as in Example 1.
M1100, MFR = 3.0) was laminated with a stretchable film by melt bonding using a hot-rolled spot (hole diameter 400 μm, number of holes 620,000 / m ² ) and laminated. The heating roll temperature was 120 ° C., and the line speed was 10 m / min.
Table 1 shows the physical property values of the obtained stretchable laminate.

[Comparative Example 1]
(Elastic nonwoven fabric)
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200, density 0.867) and homopolypropylene resin (Idemitsu Petrochemical Y-6005GM, MFR =
60, density 0.900) was added and melt kneaded with an extruder at 220 ° C., weighed with a gear pump, and discharged from a melt blow nozzle in which holes with a diameter of 0.5 mm were arranged in a row at a pitch of 2 mm. A polymer is extruded under a discharge condition of 0.45 g / min per hole, and a filament is formed by thinning and solidifying with heated air (236 ° C.) blown from both sides of the nozzle, and the filament is positioned 20 cm away from the nozzle. Sprayed on a moving conveyor net at a weight of 75.0 g / m ² , a thickness of 0.39 mm, and an average fiber diameter of 22 μm.
A non-woven fabric was obtained. The spinning temperature was 220 ° C. and the spinning situation was good.
The properties of the nonwoven fabric are breaking strength 7.0N, breaking elongation 400%, elongation recovery rate 80%, air permeability 110
It was cm ³ / cm ² / sec.
Table 1 shows the physical property values of the obtained nonwoven fabric.

[Comparative Example 2]
Propylene / ethylene copolymer (ExxonMobil VM2330, MFR = 200,
Only the density 0.867) was melted with an extruder at 220 ° C., weighed with a gear pump, and the diameter was 0.5 mm.
Are discharged from a melt blow nozzle arranged in a row at a pitch of 2 mm, the polymer is extruded under a discharge condition of 0.3 g / min per hole of the nozzle, and is refined with heated air (235 ° C) blown from both sides of the nozzle. A filament is formed by solidification, and this filament is sprayed onto a moving conveyor net located 20 cm away from the nozzle to obtain a nonwoven fabric having a basis weight of 50.0 g / m ² , a thickness of 0.30 mm, and an average fiber diameter of 22 μm. It was. The spinning temperature was 220 ° C. and the spinning situation was good.
The properties of the nonwoven fabric are breaking strength 3.5N, breaking elongation 545%, elongation recovery rate 82%, air permeability 178
It was cm ³ / cm ² / sec.
Propylene / ethylene copolymer (VM1100 manufactured by ExxonMobil) in the same manner as in Example 1.
, MFR = 2.0, density 0.900), and film lamination with a stretchable film was performed to obtain a laminate.
Table 1 shows the physical property values of the obtained stretchable laminate.
However, the stretchable nonwoven fabric and the stretchable film were stuck, and the stretchable laminate could not be rewound.

[Comparative Example 3]
Propylene / ethylene copolymer of Example 1 (VM1100, MFR manufactured by ExxonMobil)
= 2.0, density 0.900) In place of the polyolefin stretchable film, a 25 μm thick unstretched polypropylene film (Toyobo pyrene film CT, density 0.90) made of polypropylene resin is used for film lamination. Carried out.
The physical properties of the film used were a breaking strength of 30 MPa and a breaking elongation of 500%.
Table 1 shows the physical property values of the obtained stretchable laminate.
However, the obtained stretchable laminate was insufficient in recoverability after stretching.

The stretchable laminate of the present invention has extremely high stretchability and peeling resistance, and can be adjusted for moisture permeability and waterproof performance, so various products that require stretchability and moisture permeability and waterproof performance are required. Can be used as a material.
Therefore, this stretchable laminate is extremely suitable as a stretchable laminate that can be used as a material for various articles such as clean room gloves, first-aid adhesive plaster, medical patches, and transdermal drugs.
In addition, the stretchable laminate of the present invention is useful as a medical patch because it can be made thin and is excellent in chemical resistance.

Claims (9)

Elastic nonwoven fabric comprising a mixture of at least one thermoplastic elastomer component (A) selected from elastomeric polypropylene and propylene / ethylene copolymer and homopolypropylene resin (B), and elastomeric polypropylene and propylene / ethylene copolymer A stretchable laminate obtained by laminating a stretchable film made of at least one thermoplastic elastomer component (C) selected from: Mixing weight ratio of thermoplastic elastomer component (A) and homopolypropylene resin (B) [(A
) / (B)] is 50/50 to 95/5. The stretchable film is composed of thermoplastic elastomer component (C) and homopolypropylene resin (D).
The stretchable laminate according to claim 1 or 2, comprising a mixture of the above. Mixing weight ratio of thermoplastic elastomer component (C) and homopolypropylene resin (D) [(C
) / (D)] is 50/50 to 95/5. The expansion and contraction according to any one of claims 1 to 4, wherein the thermoplastic elastomer component (A) has an MFR value of 50 to 400 g / 10 min, and the homopolypropylene resin (B) has an MFR value of 25 to 200 g / 10 min. Laminate. The stretchable laminate according to any one of claims 1, 2 and 5, wherein the thermoplastic elastomer component (C) has an MFR value of 30 g / 10 min or less. The stretchable laminate according to any one of claims 3 to 5, wherein the thermoplastic elastomer component (C) has an MFR value of 30 g / 10 min or less and the homopolypropylene resin (D) has an MFR value of 30 g / 10 min or less. body. The stretchable laminate according to any one of claims 1 to 7, wherein the stretchable nonwoven fabric and the stretchable film are bonded in a dot-like manner. The stretchable laminate according to any one of claims 1 to 8, which has a breaking elongation of 200% or more.