JP2009079341A - Elastic nonwoven fabric, process for producing the same, and textile product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic nonwoven fabric having good feeling to the skin without stickiness together with excellent elastic recovery, and textile products using the elastic nonwoven fabric. <P>SOLUTION: A crystalline resin composition contains a lowly christalline polypropylene satisfying (a) [mmmm]=20-60 mol%, (b) [rrrr]/(1-[mmmm])≤0.1, (c) [rmrm]>2.5 mol%, (d) [mm]×[rr]/[mr]<SP>2</SP>≤2.0, (e) mass average molecular weight (Mw)=10,000-200,000, and (f) molecular weight distribution (Mw/Mn)<4, the elastic nonwoven fabric is produced by using a mold lubricant, and the textile products uses the elastic nonwoven fabric are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an elastic nonwoven fabric that has excellent elasticity recovery properties, has no stickiness, and has a good touch, a method for producing the same, and a textile product using the elastic nonwoven fabric.

In recent years, elastic fibers and elastic nonwoven fabrics have been used for various uses such as disposable diapers, sanitary products, sanitary products, clothing materials, bandages, and packaging materials. Disposable diapers, sanitary products, etc. are used in direct contact with the body. Therefore, from the viewpoints of a good fit on the body and ease of movement of the body after wearing, moderate elasticity and elastic recovery Is required.
Patent Document 1 discloses an elastic fiber obtained by blending an elastomer such as an olefin copolymer or a styrene block copolymer and another resin component as an elastic fiber to which elastic resilience is imparted. However, since these elastomers are incompatible with polypropylene and are non-crystalline, when these elastomers and polypropylene are mixed to form elastic fibers, the elastomers bleed on the fiber surface. Therefore, the elastic nonwoven fabric made of this elastic fiber has a sticky feeling, and the fiber product using this elastic nonwoven fabric has a problem that the touch is bad.
Patent Document 2 discloses that a propylene polymer constituting a nonwoven fabric is treated with a free radical initiator. Such treatment improves the fluidity of the propylene polymer, but reduces the thermal stability of the propylene polymer.
Patent Document 3 discloses forming a fiber with a crystalline propylene polymer composition containing a crystalline propylene copolymer and a crystalline isotactic propylene homopolymer. However, the crystalline propylene copolymer is inferior in compatibility with the crystalline isotactic propylene homopolymer compared to the low crystalline polypropylene, and there is a concern that the kneading property may deteriorate and the physical properties may decrease due to bleeding on the fiber surface. The
Furthermore, Patent Document 4 discloses a fiber containing an olefin homopolymer having an [mmmm] of less than 60%, but there is no provision for the amount of highly ordered polypropylene, and there is a problem in the balance between elasticity and moldability. is there.
Patent Document 5 discloses a resin composition containing a propylene polymer and an olefin polymer, in which (mmmm) is 0.2 to 0.6 and [rrrr / (1-mmmm)] ≦ 0.1. However, since the blending amount of the low crystalline polypropylene is not sufficient, the fiber is formed and stretched when it is pulled, but it remains stretched. For this reason, there is a need for a resin composition that gives a fiber that has an elastic recoverability, that is, shrinks rather than being stretched.

JP 2003-129330 A JP-T-2007-511680 JP-T-2001-520324 Special table 2003-511578 gazette JP 2003-27331 A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an elastic nonwoven fabric that has excellent elastic recoverability, has no stickiness, and has a good touch, a method for producing the same, and a fiber product using the elastic nonwoven fabric. It is what.

As a result of intensive studies, the present inventors have found that the above object is achieved by an elastic nonwoven fabric formed from a crystalline resin composition containing a low crystalline polypropylene. That is, it has been found that a crystalline resin composition containing a low crystalline polypropylene having a low stereoregularity and a low crystallization rate is suitable as a material for forming an elastic nonwoven fabric. Moreover, when manufacturing the said elastic nonwoven fabric, it discovered that adhesion to a movement collection surface etc. could be prevented by spraying a mold release agent on the movement collection surface which collects the fiber obtained by spinning. The present invention has been completed based on such findings.
That is, this invention provides the following elastic nonwoven fabrics, its manufacturing method, and the textiles using the said elastic nonwoven fabric.
1. The elastic nonwoven fabric manufactured using the crystalline resin composition containing the low crystalline polypropylene which satisfy | fills the following (a)-(f), and a mold release agent.
(A) [mmmm] = 20-60 mol%
(B) [rrrr] / (1- [mmmm]) ≦ 0.1
(C) [rmrm]> 2.5 mol%
(D) [mm] × [rr] / [mr] ² ≦ 2.0
(E) Mass average molecular weight (Mw) = 10,000 to 200,000
(F) Molecular weight distribution (Mw / Mn) <4
2. 2. The elastic nonwoven fabric according to 1 above, wherein the low crystalline polypropylene further satisfies the following (g) and (h).
(G) Using a differential scanning calorimeter (DSC), observed at the highest temperature side of the melting endotherm curve obtained by holding at -10 ° C for 5 minutes in a nitrogen atmosphere and then increasing the temperature at 10 ° C / min. The melting point (Tm-D) defined as the peak top of the peak is 0 to 120 ° C.
(H) The stereoregularity index ([mm]) is 50 to 90 mol%.
3. 3. The elastic nonwoven fabric according to 1 or 2 above, wherein the crystalline resin composition contains a release agent.
4). The elastic nonwoven fabric according to 3 above, wherein the content of the release agent is 10 to 10,000 ppm by mass on the basis of the resin composition.

5). The method for producing an elastic nonwoven fabric according to any one of the above 1 to 4, wherein the melt of the resin composition is extruded from a nozzle and spun, and the fibers obtained by the spinning are collected on a moving collection surface. When manufacturing an elastic nonwoven fabric by the manufacturing process containing, an external mold release agent is sprayed on the said collection surface, The manufacturing method of the elastic nonwoven fabric characterized by the above-mentioned.
6). A textile product using the elastic nonwoven fabric according to any one of 1 to 4 above.

  ADVANTAGE OF THE INVENTION According to this invention, while having the outstanding elastic recovery property, there is no stickiness and it can provide the elastic nonwoven fabric with favorable touch.

The elastic nonwoven fabric of this invention is manufactured using the crystalline resin composition containing the low crystalline polypropylene which satisfy | fills the following (a)-(f), and a mold release agent. Here, in the present invention, the crystalline polypropylene means a polypropylene in which a melting point (Tm-D) described later is observed. Low crystalline polypropylene refers to crystalline polypropylene having a melting point of 0 to 120 ° C.
The following (a) to (f) can be adjusted according to the selection of the catalyst and the reaction conditions when producing the low crystalline polypropylene. The same applies to (g) and (h) described later.
(A) [mmmm] = 20-60 mol%
When the mesopentad fraction [mmmm] of the low crystalline polypropylene is 20 mol% or more, the occurrence of stickiness is suppressed, and when it is 60 mol% or less, the degree of crystallinity does not become too high. Property is improved. The mesopentad fraction [mmmm] is preferably 30 to 50 mol%, more preferably 40 to 50 mol%.
The mesopentad fraction [mmmm], the racemic pentad fraction [rrrr] and the racemic meso racemic meso pendad fraction [rmrm], which will be described later, are described in “Macromolecules, 6, 925 (1973) by A. Zambelli et al. ) ”, And the meso fraction, the racemic fraction, and the racemic meso-racemic meso fraction in the pentad unit in the polypropylene molecular chain measured by the signal of the methyl group in the ¹³ C-NMR spectrum. is there. As the mesopentad fraction [mmmm] increases, the stereoregularity increases. Further, triad fractions [mm], [rr] and [mr] described later were also calculated by the above method.
The measurement of the ¹³ C-NMR spectrum can be carried out with the following apparatus and conditions in accordance with the attribution of the peak proposed in “Macromolecules, 8, 687 (1975)” by A. Zambelli et al. it can.

Apparatus: JNM-EX400 type ¹³ C-NMR apparatus manufactured by JEOL Ltd. Method: Proton complete decoupling method Concentration: 220 mg / ml
Solvent: 90:10 (volume ratio) mixed solvent of 1,2,4-trichlorobenzene and heavy benzene Temperature: 130 ° C
Pulse width: 45 °
Pulse repetition time: 4 seconds Integration: 10,000 times

<Calculation formula>
M = m / S × 100
R = γ / S × 100
S = Pββ + Pαβ + Pαγ
S: Signal intensity of side chain methyl carbon atoms of all propylene units Pββ: 19.8 to 22.5 ppm
Pαβ: 18.0 to 17.5 ppm
Pαγ: 17.5 to 17.1 ppm
γ: Racemic pentad chain: 20.7 to 20.3 ppm
m: Mesopentad chain: 21.7-22.5 ppm

(B) [rrrr] / (1- [mmmm]) ≦ 0.1
The value of [rrrr] / [1-mmmm] is obtained from the above pentad unit fraction and is an index indicating the uniformity of the regularity distribution of the low crystalline polypropylene. When this value becomes large, it becomes a mixture of highly ordered polypropylene and atactic polypropylene like conventional polypropylene produced using an existing catalyst system, which causes stickiness.
In the low crystalline polypropylene, when [rrrr] / (1- [mmmm]) is 0.1 or less, stickiness in the fiber obtained by spinning is suppressed. From such a viewpoint, [rrrr] / (1- [mmmm]) is preferably 0.05 or less, more preferably 0.04 or less.

(C) [rmrm]> 2.5 mol%
When the racemic meso racemic meso fraction [rmrm] of the low crystalline polypropylene is a value exceeding 2.5 mol%, the randomness of the low crystalline polypropylene increases, and the resilience of the fiber obtained by spinning is improved. Is further improved. [Rmrm] is preferably 2.6 mol% or more, more preferably 2.7 mol% or more. The upper limit is usually about 10 mol%.
(D) [mm] × [rr] / [mr] ² ≦ 2.0
[Mm] × [rr] / [mr] ² represents an index of randomness of the low crystalline polypropylene, and when this value is 2.0 or less, sufficient elastic recoverability is obtained in the fiber obtained by spinning. And stickiness is also suppressed. As [mm] × [rr] / [mr] ² is closer to 0.25, the randomness becomes higher. From the viewpoint of obtaining sufficient elastic recovery, [mm] × [rr] / [mr] ² is preferably more than 0.25 and 1.8 or less, and more preferably 0.5 to 1.5.

(E) Mass average molecular weight (Mw) = 10,000 to 200,000
When the mass average molecular weight is 10,000 or more in the low crystalline polypropylene, the viscosity of the low crystalline polypropylene is not too low and is moderate, so that yarn breakage during spinning is suppressed. Further, when the mass average molecular weight is 200,000 or less, the viscosity of the low crystalline polypropylene is not too high, and the spinnability is improved. This mass average molecular weight is preferably 30,000 to 150,000, and more preferably 50,000 to 150,000. A method for measuring this mass average molecular weight will be described later.

(F) Molecular weight distribution (Mw / Mn) <4
In the low crystalline polypropylene, when the molecular weight distribution (Mw / Mn) is less than 4, occurrence of stickiness in the fiber obtained by spinning is suppressed. This molecular weight distribution is preferably 3 or less.
The mass average molecular weight (Mw) is a polystyrene-reduced mass average molecular weight measured by the gel permeation chromatography (GPC) method under the following apparatus and conditions, and the molecular weight distribution (Mw / Mn) is the same. It is a value calculated from the measured number average molecular weight (Mn) and the mass average molecular weight (Mw).

<GPC measurement device>
Column: TOSO GMHHR-H (S) HT
Detector: RI detector for liquid chromatogram WATERS 150C
<Measurement conditions>
Solvent: 1,2,4-trichlorobenzene Measurement temperature: 145 ° C
Flow rate: 1.0 ml / min Sample concentration: 2.2 mg / ml
Injection volume: 160 μl
Calibration curve: Universal Calibration
Analysis program: HT-GPC (Ver.1.0)

In the elastic nonwoven fabric of the present invention, the low crystalline polypropylene preferably further satisfies the following (g) and (h).
(G) Using a differential scanning calorimeter (DSC), observed at the highest temperature side of the melting endotherm curve obtained by holding at -10 ° C for 5 minutes in a nitrogen atmosphere and then increasing the temperature at 10 ° C / min. The melting point (Tm-D) defined as the peak top of the peak is 0 to 120 ° C.
When the melting point (Tm-D) of the low crystalline polypropylene is 0 ° C. or higher, the occurrence of stickiness in the fiber obtained by spinning is suppressed, and when it is 120 ° C. or lower, sufficient elastic recovery is obtained. From such a viewpoint, the melting point (Tm-D) is more preferably 0 to 100 ° C.
The melting point (Tm-D) was determined by using a differential scanning calorimeter (DSC-7, manufactured by Perkin Elmer Co.), and holding 10 mg of a sample at −10 ° C. for 5 minutes in a nitrogen atmosphere, then 10 ° C./min. It can be determined as the peak top of the peak observed on the highest temperature side of the melting endothermic curve obtained by raising the temperature at.

(H) The stereoregularity index ([mm]) is 50 to 90 mol%.
When the stereoregularity index ([mm]) is 50 mol% or more, the occurrence of stickiness is suppressed, and when it is 90 mol% or less, the operability in the nonwoven fabric manufacturing process is improved. From such a viewpoint, the stereoregularity index ([mm]) is more preferably 60 to 90 mol%, and still more preferably 60 to 80 mol%.
The stereoregularity index ([mm]) was measured using a JNM-EX400 type apparatus manufactured by JEOL Ltd., which will be described later, and the ¹³ C-NMR spectrum was measured in the same manner as described above, and the mesotriad fraction of the propylene chain [ mm]. The greater the value of the stereoregularity index ([mm]), the higher the stereoregularity.

  The low crystalline polypropylene can be synthesized, for example, using a homogeneous catalyst called a metallocene catalyst as described in WO2003 / 087172.

  The mold release agent used in the production of the elastic nonwoven fabric of the present invention refers to an additive for improving the peelability so that the molded nonwoven fabric does not adhere to a roll or conveyor of a molding machine. The release agent contained in the crystalline resin composition is referred to as an internal release agent, and the internal release agent refers to an additive that is added to a resin raw material to improve the peelability of the nonwoven fabric. The external mold release agent to be described later refers to an additive for directly applying to a roll or conveyor of a molding machine to improve the peelability of the nonwoven fabric.

Examples of the internal mold release agent include the following.
(1) High melting point polymer, organic carboxylic acid or metal salt thereof, aromatic sulfonate salt or metal salt thereof, organic phosphate compound or metal salt thereof, dibenzylidene sorbitol or derivative thereof, rosin acid partial metal salt, inorganic fine particles, Imido acid, amide acid, quinacridones, quinones or mixtures thereof.
(A) High melting point polymer Polyolefin such as polyethylene and polypropylene.
(B) Metal salt Aluminum benzoate, aluminum pt-butylbenzoate, sodium adipate, sodium thiophenecarboxylate, sodium pyrolecarboxylate, and the like, and metal soaps that are metal salts of carboxylic acids . As metals, Li, Ca, Ba, Zu, Mg, Al, Pb, etc. As carboxylic acids, octylic acid, palmitic acid, lauric acid, stearic acid, behenic acid, montanic acid, 12-hydroxystearic acid, oleic acid, Examples include fatty acids such as isostearic acid and linosyl acid, and aromatic acids such as benzoic acid and pt-b-benzoic acid.
(C) Dibenzylidenesorbitol or a derivative thereof Dibenzylidenesorbitol, 1,3: 2,4-bis (o-3,4-dimethylbenzylidene) sorbitol, 1,3: 2,4-bis (o-2,4- Dimethylbenzylidene) sorbitol, 1,3: 2,4-bis (o-4-ethylbenzylidene) sorbitol, 1,3: 2,4-bis (o-4-chlorobenzylidene) sorbitol and 1,3: 2,4 -Dibenzylidene sorbitol and the like, specifically, Gelall MD, Gelall MD-R, etc. manufactured by Shin Nippon Rika Co., Ltd.
(D) Rosin acid partial metal salt Pine Crystal KM1600, Pine Crystal KM1500, Pine Crystal KM1300, etc. manufactured by Arakawa Chemical Industries, Ltd.
(E) Inorganic fine particles Talc, clay, mica, asbestos, glass fiber, glass flake, glass beads, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, alumina, silica, diatomaceous earth, titanium oxide, magnesium oxide, pumice Powder, pumice balloon, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite, calcium sulfate, potassium titanate, barium sulfate, calcium sulfite and molybdenum sulfide.
(F) Amide compounds Adipic acid dianilide, suberic acid dianilide and the like.
(G) Organophosphate metal salt Adeka Stub NA-11 and Adeka Stub NA-21 manufactured by ADEKA Corporation.
(2) Synthetic silica-based silicia manufactured by Fuji Silysia Co., Ltd., Mizusukasil manufactured by Mizusawa Chemical Industry Co., Ltd.
(3) Erucic acid amide, oleic acid amide, stearic acid amide, behenic acid amide, ethylene bis stearic acid amide, ethylene bis oleic acid amide, stearyl erucamide, oleyl palmitoamide and the like.

These internal mold release agents can be used individually by 1 type or in combination of 2 or more types. In the present invention, among these internal mold release agents, dibenzylidene sorbitol, 1,3: 2,4-bis (o-3,4-dimethylbenzylidene) sorbitol, 1,3: 2,4-bis (o -2,4-dimethylbenzylidene) sorbitol, 1,3: 2,4-bis (o-4-ethylbenzylidene) sorbitol, 1,3: 2,4-bis (o-4-chlorobenzylidene) sorbitol and 1, 3: 2,4-dibenzylidene sorbitol is preferred.
In the crystalline resin composition used for producing the elastic nonwoven fabric of the present invention, the content of the internal release agent is preferably 10 to 10,000 ppm by mass, more preferably 100 to 5000 ppm by mass based on the resin composition. When the content of the internal mold release agent is 10 mass ppm or more, the function as a mold release agent is expressed, and when it is 10000 mass ppm or less, the balance between the function as the mold release agent and the economical efficiency is improved.

  Various additives can be added to the crystalline resin composition used in the production of the elastic nonwoven fabric of the present invention as necessary. Examples of the additive include an antioxidant, a neutralizing agent, a slip agent, an antiblocking agent, an antifogging agent, and an antistatic agent. These additives may be used individually by 1 type, and may be used in combination of 2 or more types. For example, examples of the antioxidant include phosphorus-based antioxidants, phenol-based antioxidants, and sulfur-based antioxidants. These may be added during the preparation of the crystalline resin composition, or may be added during the production of the low crystalline polypropylene.

The elastic nonwoven fabric of this invention can be manufactured by methods, such as a melt blow method and a spun bond method, and a manufacturing method can be suitably selected according to the use of an elastic nonwoven fabric.
In the melt blow method, after extruding a melt of the crystalline resin composition from a nozzle, it is brought into contact with a high-speed heated gas flow to form fine fibers, and the fine fibers are collected on a moving collection surface to form a nonwoven fabric. Elastic nonwoven fabrics can be manufactured. The nonwoven fabric produced by the melt blow method has a good texture because the average diameter of the fibers constituting the nonwoven fabric is small.
In the spunbond method, a continuous resin fiber is formed by spinning, stretching and opening a crystalline resin composition that has been melt-kneaded, and the continuous fiber is subsequently deposited on the moving collection surface in a continuous process. An elastic nonwoven fabric is manufactured by combining. In the spunbond method, an elastic nonwoven fabric can be produced continuously, and the elastic nonwoven fabric produced by the spunbond method has a high strength because the fibers constituting the nonwoven fabric are continuous long fibers.

  In the production of the elastic nonwoven fabric of the present invention, when an external release agent is used, the external release agent is sprayed on the moving collection surface. Further, when the crystalline resin composition for producing an elastic nonwoven fabric contains an internal release agent, it is not necessary to spray an external release agent on the moving collection surface, but a good release property is obtained. From the above, when producing the elastic nonwoven fabric, an external release agent may be sprayed on the moving collection surface.

Examples of the external release agent include a fluorine release agent and a silicone release agent. Examples of the fluorine-based mold release agent include Die Free manufactured by Daikin Industries, Ltd. and Fleas manufactured by Neos Co., Ltd. Silicone mold release agents include SPRAY200 manufactured by Toray Dow Corning Silicone Co., Ltd., KF96SP manufactured by Shin-Etsu Chemical Co., Ltd., Eporise 96 manufactured by Nippon Pernox Co., Ltd., and KURE- manufactured by Kure Kogyo Co., Ltd. 1046 or the like. These can be used individually by 1 type or in combination of 2 or more types. In the present invention, among these external release agents, a silicone release agent is preferable.
Examples of the method for spraying the external release agent on the collection surface include a spray method.

  Although it does not specifically limit as a fiber product using the elastic nonwoven fabric of this invention, For example, the following fiber products can be mentioned. That is, disposable diaper members, elastic members for diaper covers, elastic members for sanitary products, elastic members for hygiene products, elastic tapes, adhesive bandages, elastic members for clothing, insulation materials for clothing, heat insulation materials for clothing, Protective clothing, hat, mask, gloves, supporter, elastic bandage, poultice base fabric, anti-slip base fabric, vibration absorber, finger sack, clean room air filter, electret processed electret filter, separator, insulation , Coffee bags, food packaging materials, automotive ceiling skin materials, soundproof materials, cushion materials, speaker dustproof materials, air cleaner materials, insulator skins, backing materials, adhesive nonwoven fabric sheets, door trims and other automotive parts, copying machine cleaning Various cleaning materials such as wood, surface and backing materials for carpets, agricultural distribution, wood drain , Mention may be made of shoes for members such as sports shoes skin, a bag member, industrial sealing material, such as wiping material and sheets.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
Example 1
(1) Production of Low Crystalline Polypropylene A stainless steel reactor with an internal volume of 20 L equipped with a stirrer was mixed with 20 L / h of n-heptane, 15 mmol / h of triisobutylaluminum, and dimethylanilinium tetrakispentafluorophenylborate ( 1,2'-dimethylsilylene) (2,1'-dimethylsilylene) -bis (3-trimethylsilylmethylindenyl) zirconium dichloride, triisobutylaluminum and propylene are contacted in advance at a mass ratio of 1: 2: 20. The catalyst component thus obtained was continuously supplied at 6 μmol / h in terms of zirconium.
The polymerization temperature is set to 70 ° C., and propylene and hydrogen are continuously supplied so that the hydrogen concentration in the gas phase of the reactor is 8 mol% and the total pressure in the reactor is maintained at 0.7 MPa · G. A polymerization reaction was performed.
By adding Irganox 1010 (manufactured by Ciba Specialty Chemicals) as a stabilizer to the obtained polymerization solution so that the content ratio is 500 ppm by mass, and then removing n-heptane as a solvent, A low crystalline polypropylene was obtained.
About the obtained low crystalline polypropylene, melting point (Tm-D), stereoregularity index ([mm]), mesopentad fraction [mmmm], racemic meso racemic meso fraction [rmrm], [rrrr] ] / (1- [mmmm]), [mm] × [rr] / [mr] ² , mass average molecular weight (Mw) and molecular weight distribution (Mw / Mn) were measured. The results are shown in Table 1.

(2) Molding of elastic nonwoven fabric The low crystalline polypropylene obtained in (1) above was melt extruded at a resin temperature of 220 ° C. using a single screw extruder having a gear pump with a screw diameter of 65 mm, and a nozzle diameter of 0.3 mm. The nozzle (number of holes: 841 holes) was spun by discharging the molten resin at a rate of 0.5 g / min per single hole. While cooling the fiber obtained by spinning with air at a temperature of 15 ° C. and a wind speed of 0.8 m / sec, the fiber was sucked at an ejector pressure of 0.22 MPa with an ejector installed 1400 mm below the nozzle, and 11 m / min at 255 mm below the nozzle. Fibers were laminated while spraying a silicone mold release agent (TOZAI CORPORATION SILICON RELEASE AGENT SREASE PC) on the net surface moving at the line speed. The fiber bundle laminated on the net surface was embossed with an embossing roll heated to 40 ° C. at a linear pressure of 39.2 kN / m, and wound on a take-up roll.
The obtained elastic nonwoven fabric was subjected to the following measurements and evaluations. The results are shown in Table 2.

(1) Measurement of elastic recovery rate From the obtained elastic nonwoven fabric, a test piece having a length of 200 mm and a width of 25 mm was sampled in the machine direction (MD) and the direction perpendicular to the machine direction (TD). Using a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-I), the initial length L ₀ was set to 100 mm, and after 100% elongation at a tensile speed of 300 mm / min, it was immediately returned at 300 mm / min. The length L (mm) when the stress was 0 was measured. The elastic recovery rate (%) was calculated by the following formula.
Elastic recovery rate (%) = (2-L / L ₀ ) × 100
(2) Evaluation of stickiness of elastic nonwoven fabric The touch was evaluated by 10 panelists. The score is 2 points if you feel no stickiness, 1 point if you feel a little stickiness, 0 point if you feel stickiness, and the total score of 10 panelists is 14 points or higher A, 10-13 points B, 9 points or less were determined as evaluation C.
(3) Roll release property It evaluated by the frequency | count of winding to a calendar roll during 1 hour shaping | molding.
A: There is no winding.
○: Winding is 1 to 2 times.
(Triangle | delta): Winding is 3 times or more.
(4) Roping The presence or absence of the phenomenon (roping) of forming a bundle in which adjacent yarns adhered between the nozzle and the ejector was visually confirmed.
A: Not generated.
X: It occurred.
(5) Heat-fusibility The web was evaluated by the embossing temperature when the web was heat-fused with an embossing roll to form a nonwoven fabric. If the temperature is too high, the web adheres to the roll and winds. If the temperature is too low, sufficient adhesive strength cannot be obtained, and fuzzing and fraying occur. The temperature at which such roll adhesion and fluffing did not occur was defined as the embossing temperature. The evaluation conditions are as follows.
Embossing pressure (linear pressure): 39.2kN / m
Speed: 11m / min Web width: 0.5m

Example 2
In Example 1, Example 1 except that 5000 mass ppm of an internal mold release agent (manufactured by Shin Nippon Rika Co., Ltd., Gelol MD) was added to low crystalline polypropylene, and no mold release agent was used during molding. In the same manner, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 3
Example 1 Example 1 except that 500 mass ppm of an internal mold release agent (manufactured by Shin Nippon Rika Co., Ltd., Gelol MD) was added to low crystalline polypropylene, and no mold release agent was used during molding. In the same manner, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 4
In Example 1, except that 10000 mass ppm of high crystalline polypropylene (Prime Polymer Co., Ltd., Y2000GP) was added to the low crystalline polypropylene as an internal release agent, and no release agent was used during molding. The elastic nonwoven fabric was shape | molded similarly to Example 1, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 5
In Example 1, an elastic nonwoven fabric was molded in the same manner as in Example 1 except that 500 mass ppm of an internal mold release agent (manufactured by Shin Nippon Rika Co., Ltd., Gelol MD) was added to low crystalline polypropylene. Measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Comparative Example 1
In Example 1, an elastic nonwoven fabric was molded in the same manner as in Example 1 except that no release agent was used during molding, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 6
In Example 1, the polymerization temperature was set to 67 ° C., the hydrogen concentration in the gas phase part of the reactor was maintained at 0.8 mol%, and the total pressure in the reactor was maintained at 0.75 MPa · G. A low crystalline polypropylene was obtained in the same manner as in Example 1 except that hydrogen and hydrogen were continuously supplied, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 7
In Example 2, the polymerization temperature was set to 67 ° C., the hydrogen concentration in the gas phase portion of the reactor was maintained at 0.8 mol%, and the total pressure in the reactor was maintained at 0.75 MPa · G. In the same manner as in Example 2 except that hydrogen and hydrogen were continuously supplied, a low crystalline polypropylene was obtained, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 8
In Example 3, the polymerization temperature was set to 67 ° C., the hydrogen concentration in the gas phase part of the reactor was maintained at 0.8 mol%, and the total pressure in the reactor was maintained at 0.75 MPa · G. A low crystalline polypropylene was obtained in the same manner as in Example 3 except that hydrogen and hydrogen were continuously supplied, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 9
In Example 4, the polymerization temperature was set to 67 ° C., the hydrogen concentration in the gas phase part of the reactor was maintained at 0.8 mol%, and the total pressure in the reactor was maintained at 0.75 MPa · G. A low crystalline polypropylene was obtained in the same manner as in Example 4 except that hydrogen and hydrogen were continuously supplied, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Example 10
In Example 5, the polymerization temperature was set to 67 ° C., the hydrogen concentration in the gas phase part of the reactor was maintained at 0.8 mol%, and the total pressure in the reactor was maintained at 0.75 MPa · G. A low crystalline polypropylene was obtained in the same manner as in Example 5 except that hydrogen and hydrogen were continuously supplied, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

Comparative Example 2
In Comparative Example 1, the polymerization temperature was set to 67 ° C., the hydrogen concentration in the gas phase part of the reactor was maintained at 0.8 mol%, and the total pressure in the reactor was maintained at 0.75 MPa · G. A low crystalline polypropylene was obtained in the same manner as in Comparative Example 1 except that hydrogen and hydrogen were continuously supplied, an elastic nonwoven fabric was molded, and the same measurement and evaluation were performed. The results are shown in Tables 1 and 2.

  The elastic nonwoven fabric of the present invention is suitably used for various textile products such as disposable diapers, sanitary products, sanitary products, clothing materials, bandages and packaging materials.

Claims (6)

The elastic nonwoven fabric manufactured using the crystalline resin composition containing the low crystalline polypropylene which satisfy | fills the following (a)-(f), and a mold release agent.
(A) [mmmm] = 20-60 mol%
(B) [rrrr] / (1- [mmmm]) ≦ 0.1
(C) [rmrm]> 2.5 mol%
(D) [mm] × [rr] / [mr] ² ≦ 2.0
(E) Mass average molecular weight (Mw) = 10,000 to 200,000
(F) Molecular weight distribution (Mw / Mn) <4 The elastic nonwoven fabric according to claim 1, wherein the low crystalline polypropylene further satisfies the following (g) and (h).
(G) Using a differential scanning calorimeter (DSC), observed at the highest temperature side of the melting endotherm curve obtained by holding at -10 ° C for 5 minutes in a nitrogen atmosphere and then increasing the temperature at 10 ° C / min. The melting point (Tm-D) defined as the peak top of the peak is 0 to 120 ° C.
(H) The stereoregularity index ([mm]) is 50 to 90 mol%.   The elastic nonwoven fabric according to claim 1 or 2, wherein the crystalline resin composition contains a release agent.   The elastic nonwoven fabric according to claim 3, wherein the content of the release agent is 10 to 10,000 ppm by mass on the basis of the resin composition.   It is a manufacturing method of the elastic nonwoven fabric in any one of Claims 1-4, Comprising: The melt of a resin composition is extruded and spun from a nozzle, The fiber obtained by this spinning is collected on a movement collection surface. When manufacturing an elastic nonwoven fabric by the manufacturing process including a process, an external mold release agent is sprayed on the said collection surface, The manufacturing method of the elastic nonwoven fabric characterized by the above-mentioned.   The textiles using the elastic nonwoven fabric in any one of Claims 1-4.