JP2003113573A - Stretchable nonwoven fabric of melt-blown fiber and fiber article using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive stretchable nonwoven fabric of melt-blown fibers that has excellent elasticity, a proper level of elongation stress, high chemical resistance and antiblocking properties, occurs no noxious combustion gas, can be recyclably produced in no need of complicated production steps and to provide the fiber articles using the same. SOLUTION: A resin composition including (A) 20-80 wt.% of an olefinic copolymer component with the crystallinity of 0-50% and the number-average molecular weight (Mn) of 30,000-60,000 and (B) 80-20 wt.% of a hydrogenated butadiene polymer component is melt-blown to give the stretchable nonwoven fabric of melt-blown fibers and the fiber articles are produced from the melt- blown nonwoven fabric.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an elastic melt-blown nonwoven fabric and a textile product using the same. More specifically, the present invention relates to an elastic meltblown nonwoven fabric which has excellent elasticity and moderate stress during elongation, does not generate toxic gas during combustion, and is most suitable for use as a recyclable textile product, and a textile product using the same.

[0002]

2. Description of the Related Art An elastic non-woven fabric is a non-woven fabric having rubber-like elasticity and is also called a stretchable non-woven fabric, and has been used for various purposes in recent years and its use is expanding. In particular, it is used for, for example, disposable diapers, clothes, caps, bandages, tapes, etc. for the purpose of improving the fit to the body. The performance required for them is a proper fit, elasticity, and elasticity. In particular, polyurethane elastic nonwoven fabric is most often used as one satisfying such performance. However, the polyurethane elastic nonwoven fabric has problems such as generation of toxic gas during combustion, non-recyclability, high price, chemical resistance, and complicated manufacturing process, and development of an elastic nonwoven fabric without these problems is desired.

Japanese Patent No. 3110533 discloses that ethylene.
An inexpensive, recyclable, elastic non-woven fabric using an α-olefin copolymer, which does not generate toxic gas during combustion, has been proposed. However, this elastic nonwoven fabric has a problem of low elasticity.

Further, in JP-A-8-013237, a hydrogenated block copolymer comprising a polybutadiene block having a vinyl bond content of 30% or less and a (co) polymer block comprising isoprene-butadiene and an olefin polymer are disclosed. Elastic fibers containing are proposed. Since this elastic fiber contains isoprene, it has tackiness, and the obtained product has a problem of poor anti-blocking property.

Further, JP-A-11-012908 proposes a stretchable nonwoven fabric containing a hydrogenated diene polymer and a crystalline low molecular weight polyolefin having a number average molecular weight of 20,000 or less. This stretchable nonwoven fabric has the problems that it is difficult to manufacture the nonwoven fabric, the elongation at break is less than 200%, it is very brittle, the elastic performance is low, and the stress during elongation is extremely high.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to have excellent elasticity and moderate stress during extension, to produce no toxic gas during combustion, to be recyclable, and to have excellent chemical resistance and antiblocking properties. An object of the present invention is to provide an inexpensive elastic melt-blown nonwoven fabric that does not require a complicated manufacturing process and a fiber product using the same.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems. As a result, the crystallinity is 0 to 50% and the number average molecular weight (Mn) is 300.
An elastic meltblown nonwoven fabric made of a composition containing 20 to 80% by weight of an olefinic copolymer component (A) of 80 to 60,000 and 80 to 20% by weight of a hydrogenated butadiene-based polymer component (B), and the same were used. The textile product has the prospect that the object of the present invention can be achieved, and based on this, the present invention has been completed.

The present invention has the following configuration. (1) Crystallinity is 0 to 50%, and number average molecular weight (M
An elastic meltblown nonwoven fabric comprising a composition containing 20 to 80% by weight of an olefinic copolymer component (A) having n) of 30,000 to 60,000 and 80 to 20% by weight of a hydrogenated butadiene-based polymer component (B).

(2) Hydrogenated butadiene polymer component (B)
Is an olefin crystal / ethylene / butylene / olefin crystal block copolymer, wherein the elastic meltblown non-woven fabric according to item (1).

(3) Olefin-based copolymer component (A)
Is a copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms or a copolymer of propylene and an α-olefin having 4 to 10 carbon atoms, and has a molecular weight distribution (Mw / Mn)
The elastic meltblown nonwoven fabric according to the item (1) or (2), wherein the value is 1.5 to 4.

(4) 100% of elastic meltblown nonwoven fabric
The elongation recovery rate during elongation is 90% or more, and the stress during 100% elongation is 100 to 300 cN / 25 in terms of 100 g / m ² basis weight.
The elastic meltblown nonwoven fabric according to any one of the items (1) to (3), which has a size of mm.

(5) Any one of the above items (1) to (4)
A composite elastic meltblown nonwoven fabric obtained by laminating at least one selected from a nonwoven fabric having elasticity other than the elastic meltblown nonwoven fabric, a film, a knitted fabric, and a woven fabric on the elastic meltblown nonwoven fabric according to the item.

(6) Any one of the above items (1) to (4)
A fiber product using the elastic melt-blown nonwoven fabric according to the item or the composite elastic melt-blown nonwoven fabric according to the item (5).

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. The elastic meltblown nonwoven fabric of the present invention comprises an olefin copolymer component (A) (hereinafter referred to as component A) in an amount of 20 to 80% by weight, and a hydrogenated butadiene polymer component (B) (hereinafter referred to as component (B)). An elastic meltblown nonwoven fabric composed of a composition containing 80 to 20% by weight.

The component (A) is a copolymer of olefinic monomers, has a crystallinity of 0 to 50%, preferably 5 to 40% as measured by X-ray diffraction, and has a number average molecular weight. (Mn) is 30,000 to 60,000, preferably 3
It is 0000 to 50,000. When the crystallinity is much higher than 50%, the elasticity is extremely lowered and the stress during elongation is also extremely high. Therefore, the crystallinity must be 0 to 50%. Further, when the number average molecular weight (Mn) is significantly smaller than 30,000, it is difficult to produce a nonwoven fabric, and the nonwoven fabric obtained does not have a breaking elongation of 200% and an appropriate elongation stress cannot be obtained. . Conversely, the number average molecular weight (Mn) is 60
If it is much larger than 000, the strength of the fiber becomes strong, and the tightening force of the non-woven fabric made of the fiber becomes strong, but the fluidity of the olefin copolymer as the component (A) deteriorates and it becomes difficult to form the fiber. Therefore, the number average molecular weight (Mn) of the olefin copolymer component (A) is 30,000 to 6
Must be 0000.

The olefin copolymer as the component (A) is a copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms or a copolymer of propylene and an α-olefin having 4 to 10 carbon atoms. , Molecular weight distribution (Mw from the viewpoint of spinnability)
/ Mn = weight average molecular weight / number average molecular weight) is 1.5 to 4
Is preferred. Examples of the α-olefin having 3 to 10 carbon atoms include propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene. , 1-heptene, 1-octene, 1-nonene, 1-decene and the like. Among them, the α-olefin is 1
-Butene, 1-pentene, 1-hexene or 1-octene are preferred. These α-olefins may be used alone or in combination of two or more. Also,
The olefin-based copolymer of the component (A) includes ethylene and α
-A terpolymer in which a crosslinking diene monomer is added to olefin is also included, and examples of such an olefin copolymer include ethylene / propylene / diene rubber and ethylene / butene / diene rubber.

As the component (A), ethylene.α-
Olefin is preferable, and ethylene / octene copolymer and ethylene / butene-1 copolymer are particularly preferable. Specific examples of the olefin-based copolymer as the component (A) include Engage (trade name, manufactured by DuPont Dow Elastomers Japan Co., Ltd.) and Tuffmer (trade name, manufactured by Mitsui Chemicals, Inc.). Further, the olefin-based copolymer as the component (A) may be produced by a metallocene catalyst.

In the present invention, the component (B) is a block polymer composed mainly of butadiene and composed of a block (a) which becomes a hard segment after hydrogenation and a block (b) which becomes a soft segment after hydrogenation. It is obtained by hydrogenating. The main component means the most component. The block polymer comprises a polybutadiene block (a) having a 1,2-bond content of 25% by weight or less, more preferably 20% by weight or less, and a 1,2- and 3,4-bond content of 50% by weight or more. It is preferable that the block polymer is composed of the polybutadiene block (b) The block (a) becomes a block having a crystalline polyethylene-like structure after hydrogenation. The 1,2-bond content of the block (a) greatly affects the crystallinity of the block (a) after hydrogenation, and when it is significantly larger than 25% by weight, the mechanical strength of the target elastic meltblown nonwoven fabric is It may decrease. The block (b) becomes a block showing the structure of a rubber-like ethylene / 1-butene copolymer block after hydrogenation. 1,2-of block (b)
The bond content affects the physical properties of rubber after hydrogenation.
If it is much smaller than 0% by weight, the rubber-like physical properties may be significantly deteriorated.

Examples of the block polymer include (a)-
One or more of a (b) type block polymer, a (a)-(b)-(a) type block polymer, or a block polymer in which the block polymer unit is extended or branched via a coupling agent residue. An example is a block polymer consisting of
Examples of the component (B) include hydrogenated block polymers in which the double bond portion of the block polymer is hydrogenated and saturated at a hydrogenation rate of 70% or more, and the number average molecular weight is 40,000 to 700,000. In the present invention, as the component (B), an olefin crystal / ethylene / butylene / olefin crystal block polymer obtained by hydrogenating the (a)-(b)-(a) type block polymer can be preferably used. , As a specific example, Dynaron (trade name, J
SR Co., Ltd. etc. are mentioned.

Examples of the monomer other than butadiene used when the block polymer composed of the blocks (a) and (b) is a copolymer include diene compounds other than butadiene and vinyl aromatic compounds. be able to. As the diene compound other than butadiene,
Isoprene, 2,3-dimethyl 1,3-butadiene,
1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,
Examples include 3-octadiene, 3-butyl-1,3-octadiene and chloroprene. In addition, it is preferable not to use isoprene as the monomer of the block (b). When isoprene is contained in the block (b),
The melt-blown non-woven fabric using the component (B) obtained therefrom has tackiness and deteriorates anti-blocking property. For example, in summer, packing bales are stacked in multiple layers in a warehouse without a temperature control device or in a transportation truck. In this case, the non-woven fabrics tend to stick to each other and the operability at the time of feeding by the user is likely to deteriorate.

When the vinyl aromatic compound is used as a monomer in the present invention, the polymer block (b) is
A vinyl aromatic compound-butadiene compound random copolymer containing 70% by weight or more of a butadiene compound, wherein the vinyl bond content of the butadiene compound portion is 25 to 7
0% by weight, and the block structure is (a)-(ba) n.
Alternatively, it is preferably a linear or branched block copolymer represented by (ab) m (where n is an integer of 1 or more and m is an integer of 2 or more).

As the vinyl aromatic compound, styrene, α-methylstyrene, p-methylstyrene, t-butylstyrene, divinylbenzene, N, N-dimethyl-
Examples thereof include p-aminoethylstyrene, N, N-diethyl-p-aminoethylstyrene and vinylpyridine, and styrene and α-methylstyrene are preferable. In addition, it is preferable not to use an aromatic vinyl compound represented by styrene in the block (a). When the block (a) contains an aromatic vinyl compound, the component (B) obtained from it
There is a possibility that the chemical resistance of the melt blown non-woven fabric using the is decreased.

The composition comprising the olefin copolymer component (A) and the hydrogenated butadiene polymer component (B) used in the production of the elastic meltblown nonwoven fabric of the present invention may contain various stabilizers, if necessary. An ultraviolet absorber, a thickening / branching agent, a matting agent, a coloring agent, a flexibility-imparting agent such as rubber, and various other improving agents can be added.

The component mixing ratio of the composition constituting the elastic meltblown nonwoven fabric of the present invention is 20 to 80% by weight, preferably 30 to 70% by weight of the olefin copolymer component (A), and the hydrogenated butadiene polymer component. (B) 80 to 20% by weight, preferably 70 to 30% by weight. The component (A) is a component that mainly imparts stress during elongation to the meltblown nonwoven fabric, and the component (B) is a component that mainly imparts elasticity. When the content of the component (A) is less than 20% by weight, the resulting nonwoven fabric has good elasticity but insufficient elongation stress. Further, if the content of the component (B) is less than 20% by weight, the stress during elongation is good, but the elasticity is insufficient. Therefore, in order to satisfy both the properties of elasticity and stress during elongation, the component (A) is 20 to 80% by weight and the component (B) is 80 to 2% by weight.
It is necessary that the ratio is 0% by weight.

In the elastic melt-blown nonwoven fabric of the present invention, the above composition is melt-kneaded at a softening point of component (A) and component (B) or higher and extruded through a spinneret (nozzle) to form a fine melt. Is contacted with a high-speed heated gas flow to obtain finer fibers, and the fine fibers are collected on a porous support by a melt blowing method. The elastic melt-blown nonwoven fabric produced by the melt-blowing method has good texture, concealing property, and air permeability because the elastic fibers constituting it are fine fibers. Further, the melt blow method is preferable because it is a simple manufacturing method capable of completing from resin to nonwoven fabric in one step.

The average fiber diameter of the elastic fibers constituting the elastic meltblown nonwoven fabric of the present invention is preferably 1 to 50 μm, more preferably 1 to 24 μm. The finer the fibers constituting the fabric, the better the texture and hiding power of the non-woven fabric, but considering both the production cost and the non-woven fabric performance, the average fiber diameter is 5
The range of up to 24 μm is preferred. The nonwoven fabric weight of the elastic meltblown nonwoven fabric of the present invention is preferably 5 to 300.
g / m ^2, more preferably 20 to 200 g / m ^2, more preferably from 50 to 150 g / m ^2.

The elastic melt-blown non-woven fabric of the present invention has a point bond process, a sonic bond process,
Any one or more of water jet processing, needle punching processing, and resin bond processing may be performed.

The elastic meltblown nonwoven fabric of the present invention has 10
The elongation recovery rate at 0% elongation is preferably 90% or more. The elongation recovery rate is an index of elasticity, and a nonwoven fabric having an elongation recovery rate of 90% or more is generally called a good elastic nonwoven fabric or a stretchable nonwoven fabric. For example, the elastic recovery rate at 100% elongation required for the elastic nonwoven fabric used for diapers is 90% or more.

The elastic meltblown nonwoven fabric of the present invention is 100 in that a proper tightening force can be obtained when it is made into a product.
% Elongation stress (geometric mean of MD and CD) is 100 to 300 cN / 25 m in terms of 100 g / m ² of basis weight of the nonwoven fabric.
When the nonwoven fabric is used, for example, in the waist portion of a disposable diaper for infants, the excrement does not leak and the diaper does not come off. No skin irritation caused by.

The elastic melt-blown non-woven fabric of the present invention is laminated with at least one fabric selected from non-woven fabrics, films, knits and woven fabrics having elasticity other than the elastic melt-blown non-woven fabric as long as the elastic performance is not impaired. It can be used as an elasticized melt-blown nonwoven fabric. The fabric preferably has an elongation recovery rate of 90% or more when stretched by 20%, and is made of a thermoplastic elastomer resin such as a styrene elastomer, an olefin elastomer, a polyester elastomer, or a polyurethane elastomer. Melt blown non-woven fabrics, films, and knitted fabrics of fibers made of these thermoplastic elastomer resins can be mentioned. Further, a nonwoven fabric, a woven fabric, or a knitted fabric, which is structurally elastic by crimping, may be used instead of the elastomer material, but is not limited thereto.

The elastic melt-blown non-woven fabric of the present invention is a textile product, for example, a stretchable member for disposable diapers, a stretchable member for diapers, a stretchable member for sanitary products, a stretchable member for sanitary materials such as a stretchable member for diaper covers, Elastic tape,
Adhesive plasters, elastic members for clothes, hats, masks, gloves, supporters, elastic bandages, base cloth for poultice materials, non-slip base cloth,
It can be suitably used for vibration absorbers, finger cots, filters, separators, filters, separators and the like.

[0032]

EXAMPLES The present invention will be described in more detail below with reference to examples of the present invention and comparative examples, but the present invention is not limited to these examples. The measurements of Examples and Comparative Examples were performed according to the following methods.

(1) Crystallinity apparatus: wide angle X-ray diffractometer [JDX-82, manufactured by JEOL Ltd.]
00T type]. Source: CuKa line, output: 50KV-15
0 mA. Scanning speed: 1 ° / min for 2θ = 5 ° to 35 °. Receiving slit: 0.2 mm.

(2) Molecular weight distribution (Mw / Mn), number average molecular weight (Mn) Determined by GPC (gel permeation chromatography).

(3) Melt flow rate (hereinafter referred to as MFR) MFR was measured according to JIS K 7210.

(4) Elongation recovery rate of nonwoven fabric and stress width during elongation 2.5 cm Prepare three test pieces each in the longitudinal direction (MD) and the transverse direction (CD) having a length of 20 cm. Using a tensile tester (Autograph AG-G, Shimadzu Corporation), the distance between the chucks was set to 10 cm and the test piece was fixed.
Elongate to 100% at a pulling speed of 300 mm / min and then return to 0% at the same speed to reduce the stress applied to the elastic fiber.
And Immediately after that, it was again stretched to 100% at the same speed, and the stretched length when the stress application started again was defined as Lmm. The elongation recovery rate was calculated according to the following formula 1. The average value of the MD extension recovery rate and the average value of the CD extension recovery rate were determined, and the geometric average of MD and CD was determined by the following formula 2 to obtain 100% extension recovery rate. Elongation recovery rate at 100% elongation (%) = (100−L) / 100 × 100 Equation 1 Elongation recovery rate geometric mean value = (average value of MD × average value of CD) ^1/2 Equation 2 Stress at this time the values obtained by the non-woven fabric 100 g / m ² in terms of 100% elongation at a stress, like the stretch-back ratio in equation 2 to determine the geometric mean of MD and CD.

(5) Fiber Diameter of Elastic Fiber Constituting Nonwoven Fabric A piece of nonwoven fabric measuring 10 mm in length and 10 mm in width (a total of 5 pieces) was cut from any 5 places of the nonwoven fabric, and the surface was observed with an electron microscope. The fiber diameter of 20 fibers was measured from one piece of the nonwoven fabric, and this was measured with 5 pieces of the nonwoven fabric, and the average value of the fiber diameters of 100 fibers in total was calculated.

(6) Texture of non-woven fabric A non-woven fabric having a length of 10 cm and a width of 10 cm is prepared. Ten people touch the non-woven fabric to judge the texture. Ten panelists performed a 10-point evaluation, and the total score of all the members was used for evaluation. Therefore, the minimum is 0 points and the maximum is 100 points.

(7) Chemical resistance Using 10 g of elastic melt-blown non-woven fabric and 200 ml of toluene, the elastic melt-blown non-woven fabric was immersed in toluene for 7 days, and the weight reduction rate after drying the elastic melt-blown non-woven fabric was determined. The non-woven fabric in which the weight loss occurred was evaluated as ×, the non-woven fabric in which the morphology changed due to swelling but did not change in weight was evaluated as ○, and the non-woven fabric which did not change at all was evaluated as ⊚.

(8) Anti-blocking property Two test pieces having a length of 10 cm and a width of 10 cm are prepared. An aluminum plate having a length of 10 cm and a width of 10 cm is placed on the stacked test pieces, and a weight is further placed on the aluminum plate to adjust the weight to a total of 5 kg, and the test piece is left in an oven at 50 ° C. for 24 hours. The test piece taken out is cut into a width of 25 mm and a width of 25 mm
Peel strength per area Tensile tester Autograph AG-G
(Shimadzu Corporation) (N = 5). Those having a peel strength of less than 100 cN / 25 mm were judged to have good antiblocking properties.

(9) 1,2-bond content and 3,4-bond content of hydrogenated butadiene-based polymer It was calculated by the Hampton method using infrared analysis.

(10) Hydrogenation rate of hydrogenated butadiene polymer Using ethylene tetrachloride as a solvent, 100 MHz, H-NM
It was calculated from the R spectrum.

The materials used in the examples of the present invention are as follows. Component (A) -A-1: ethylene / 1-octene copolymer, crystallinity = 5%, Mn = 50000, Mw / Mn = 2.0, 1-
Octene content = 24 wt% A-2: ethylene / 1-octene copolymer, crystallinity = 0%, Mn = 50,000, Mw / Mn = 2.0, 1-
Octene content = 30 wt% A-3: ethylene / 1-octene copolymer, crystallinity = 50%, Mn = 50000, Mw / Mn = 2.0, 1
-Octene content = 12 wt% -A-4: ethylene / 1-octene copolymer, crystallinity = 5%, Mn = 30000, Mw / Mn = 2.0, 1-
Octene content = 24 wt% A-5: ethylene / 1-butene copolymer, crystallinity =
5%, Mn = 50000, Mw / Mn = 2.0, 1-butene content = 24% by weight A-6: ethylene / 1-octene copolymer, crystallinity = 5%, Mn = 60,000, Mw /Mn=2.0, 1-
Octene content = 24 wt% A-7: ethylene / propylene copolymer, crystallinity =
60%, Mn = 60,000, Mw / Mn = 2.0, propylene content = 7 wt%. A-8: ethylene / propylene copolymer, crystallinity =
10%, Mn = 15000, Mw / Mn = 2.0, propylene content = 20 wt%. A-9: ethylene / propylene copolymer, crystallinity = 60%, Mn = 15000, Mw / Mn = 2.0,
Propylene content = 7% by weight

Component (B) -B-1: olefin crystal / ethylene / butylene / olefin crystal block copolymer, MFR (230 ° C load 21.18N) = 2.5 g / 10 minutes, block (a);
1,2-bond content = 13% by weight, block (b); 1,
2- and 3,4-bond content = 78% by weight, hydrogenation rate =
98% B-2: olefin crystal / ethylene / butylene / olefin crystal block copolymer, MFR (230 ° C. load 21.18 N) = 4.0 g / 10 minutes, block (a);
1,2-bond content = 10% by weight, block (b); 1,
2- and 3,4-bond content = 81% by weight, hydrogenation rate =
98% B-3: olefin crystal / ethylene / butylene / olefin crystal block copolymer, MFR (230 ° C. load 21.18N) = 3.5 g / 10 minutes, block (a);
1,2-bond content = 12% by weight, block (b); 1,
2- and 3,4-bond content = 81% by weight, hydrogenation rate =
99% B-4: olefin crystal / ethylene / propylene / olefin crystal block copolymer, MFR (230 ° C. load 21.18 N) = 3.5 g / 10 minutes, block (a); 1,2-bond content = 8% by weight, block (b); 1,2- and 3,4-bond content = 55% by weight,
Hydrogenation rate = 97%

Examples 1 to 5 A-1 was used as the component (A), B-1 was used as the component (B) and blended at the mixing ratios shown in Table 1. Each of the resulting compositions was used as the raw material resin for the meltblown nonwoven fabric. Used as. An extruder equipped with a screw (30 mm diameter), a heating element, and a gear pump, a spinneret (hole diameter 0.3 mm, hole number 501 holes, effective width 500 mm), a pneumatic generator and an air heater, and a polyester net. It carried out using the apparatus which consists of a conveyor and a winder.

The raw material resin is charged into an extruder, and the raw material resin is heated and melted at 250 ° C. by a heating body, and the molten raw material resin is spun from the spinneret at a spinning speed of 0.14 g / min per hole to 4
The molten raw material resin was made into a fibrous state by being discharged into a high-pressure heated air flow of 00 ° C. and 98 kPa (gauge pressure), and was sprayed onto a polyester net collecting conveyor running at a speed of 1.3 m / min. . The collection conveyor was installed at a distance of 30 cm from the spinneret. The blown high pressure heated air was removed by a suction device provided on the back side of the collection conveyor.
The nonwoven fabric conveyed by the collecting conveyor was wound into a roll by a winder to obtain a melt blown nonwoven fabric. Table 1 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric.

The meltblown nonwoven fabrics obtained in any of the examples have excellent antiblocking properties, elasticity, and
The elongation stress, chemical resistance, and feel were good. Further, the elastic meltblown nonwoven fabrics obtained in Examples 1 to 5 were used to test whether or not they are suitable for use as disposable diapers. As a method, remove the net-like elastic material from both sides of the waist part of the P-sized Pants (product name) L size waist made by Procter & Gamble Far East Inc. The elastic melt-blown nonwoven fabrics obtained in Examples 1 to 5 were processed into the same size and then attached. Similarly, prepare 5 pieces of improved pants-type disposable diapers.
Used for one infant. As a result, everyone did not have a rash due to excessive tightening, and no tightening marks remained. In addition, the diaper did not slip or come off due to insufficient tightening, and there was no excrement leakage.

A stretchable non-woven fabric having a basis weight of 100 g / m ^{2 made} of three-dimensionally crimped polyolefin staple fibers was prepared, laminated with the elastic melt-blown non-woven fabric of Example 1 and entangled with a water jet to form a composite elastic melt-blown non-woven fabric. And In the same manner, processing was performed to produce 5 sheets. Using the obtained composite elastic melt-blown non-woven fabric as a supporter, 5 people can monitor 2 knees and test it.
I went for 4 hours. As a result, all had no rash due to excessive tightening, and no tightening marks remained. In addition, the supporters did not slip off or come off due to insufficient tightening.

Examples 6 to 10 A-1 to A-6 as the component (A) and B as the component (B)
-1 was blended at a mixing ratio of 50% by weight / 50% by weight, and the obtained composition was used as a raw material resin for a meltblown nonwoven fabric. A meltblown nonwoven fabric was manufactured by the meltblown method using the above raw material resin under the same processing conditions and manufacturing apparatus as in Example 1. However, the pressure of the compressed air introduced into the air superheater was adjusted within the range of 98 to 147 kPa (gauge pressure) in order to unify the fiber diameter to about 20 μm. Table 2 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. The meltblown nonwoven fabric obtained in any of the examples has excellent antiblocking properties, elasticity,
The elongation stress, chemical resistance, and feel were good.

Examples 11 to 12 A-1 was used as the component (A), and B-2 (Example 11) and B-3 (Example 12) were used as the component (B), each containing 5 parts.
Each of the resulting compositions was blended at a mixing ratio of 0% by weight / 50% by weight and used as a raw material resin for a meltblown nonwoven fabric.
Using the above raw material resin, a melt blown nonwoven fabric was manufactured by the melt blow method under the same processing conditions and manufacturing equipment as in Example 1. However, the pressure of the compressed air introduced into the air superheater is 98 to 147 in order to unify the fiber diameter to about 20 μm.
The pressure was adjusted between kPa (gauge pressure). Table 3 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric.
The melt-blown nonwoven fabric obtained in any of the examples has excellent anti-blocking properties, elasticity, stress during elongation,
The chemical resistance and texture were good.

Examples 13 to 16 A-1 was used as the component (A) and B-1 was used as the component (B), and they were mixed at a mixing ratio of 50% by weight / 50% by weight, and the obtained compositions were obtained. It was used as a raw material resin for meltblown nonwoven fabric. Using the above raw material resin, the pressure of the compressed air was 117.6 kPa (gauge pressure) in Example 13, and the pressure of the compressed air was 147 kPa (gauge pressure) in Example 14.
In Example 15, the pressure of the compressed air was 88.2 kPa (gauge pressure), and in Example 16, the pressure of the compressed air was 78.4 kPa.
A meltblown nonwoven fabric was manufactured by the meltblown method under the same processing conditions and manufacturing apparatus as in Example 1 except that the (gauge pressure) was used. Table 3 shows the evaluation and test results of the physical properties of the obtained meltblown nonwoven fabric. The meltblown nonwoven fabrics obtained in any of the examples were excellent in anti-blocking property, and had good elasticity, stress during elongation, chemical resistance, and feeling.

Comparative Example 1 A-1 was used as the component (A) and B-1 was used as the component (B), and the mixture was mixed at a mixing ratio of 90% by weight / 10% by weight, and the resulting composition was used as a raw material for a meltblown nonwoven fabric. Used as a resin. Using the above raw material resin, a melt blown nonwoven fabric was manufactured by the melt blow method under the same processing conditions and manufacturing equipment as in Example 1. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. The obtained melt-blown nonwoven fabric has a low 100% elongation recovery rate of 88%, and
The stress at 100% elongation was as high as 310 cN / 25 mm, and satisfactory performance was not exhibited.

Comparative Example 2 A-1 was used as the component (A) and B-1 was used as the component (B), mixed at a mixing ratio of 10% by weight / 90% by weight, and the resulting composition was used as a raw material for a meltblown nonwoven fabric. Used as a resin. Using the above raw material resin, a melt blown nonwoven fabric was manufactured by the melt blow method under the same processing conditions and manufacturing equipment as in Example 1. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. The obtained meltblown nonwoven fabric was excellent in elastic performance, but the stress at 100% elongation was as low as 95 cN / 25 mm and did not show satisfactory performance.

Comparative Example 3 A-1 was used as the component (A) and B-4 was used as the component (B), and the mixture was mixed at a mixing ratio of 50% by weight / 50% by weight, and the resulting composition was used as a raw material for a meltblown nonwoven fabric. Used as a resin. Using the above raw material resin, a melt blown nonwoven fabric was manufactured by the melt blow method under the same processing conditions and manufacturing equipment as in Example 1. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. Block of component (B) Since the component (B) is an ethylene-propylene polymer composed of isoprene, the anti-blocking property was poor (the content of Comparative Example 3 including B-4 is described in JP-A-8-01).
3237).

Comparative Example 4 A-7 was used as the component (A) and B-1 was used as the component (B), and the mixture was mixed at a mixing ratio of 50% by weight / 50% by weight, and the resulting composition was used as a raw material for a meltblown nonwoven fabric. Used as a resin. A meltblown nonwoven fabric was manufactured using the above raw material resin by the meltblowing method under the same processing conditions and manufacturing apparatus as in Example 1. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. The obtained melt-blown nonwoven fabric had a low 100% elongation recovery rate of 50% and an extremely high stress at 100% elongation of 700 cN / 25 mm, and did not show satisfactory performance.

Comparative Example 5 A-8 was used as the component (A) and B-1 was used as the component (B), and the mixture was mixed at a mixing ratio of 50% by weight / 50% by weight, and the resulting composition was used as a raw material for a meltblown nonwoven fabric. Used as a resin. Using the above raw material resin, the compressed air pressure is 78.4 kPa.
A meltblown nonwoven fabric was manufactured by the meltblowing method under the same processing conditions and manufacturing apparatus as in Example 1 except that the (gauge pressure) was used. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. The obtained melt-blown nonwoven fabric broke before it stretched to 100%. From this, it was found that the product could not be used as a product (the content of Comparative Example 5 including A-8 corresponds to JP-A-11-012908).

Comparative Example 6 A-9 was used as the component (A) and B-1 was used as the component (B), and the mixture was blended at a mixing ratio of 50% by weight / 50% by weight, and the resulting composition was used as a raw material for a meltblown nonwoven fabric. Used as a resin. Using the above raw material resin, the compressed air pressure is 78.4 kPa.
A meltblown nonwoven fabric was manufactured by the meltblowing method under the same processing conditions and manufacturing apparatus as in Example 1 except that the (gauge pressure) was used. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. The obtained melt-blown nonwoven fabric broke before it stretched to 100%. From this, it was found that it could not be used as a product (the content of Comparative Example 6 including A-9 corresponds to JP-A-11-012908).

Comparative Example 7 Only the component (A) A-1 was used as the raw material resin for the meltblown nonwoven fabric. Using the above raw material resin, a melt blown nonwoven fabric was manufactured by the melt blow method under the same processing conditions and manufacturing equipment as in Example 1. Table 4 shows the evaluation / test results of the physical properties of the obtained elastic melt-blown nonwoven fabric. Since the obtained meltblown nonwoven fabric does not contain a hydrogenated butadiene-based polymer as an elastic component, it has a 100% elongation recovery rate of 82.
%, Which was low and was not satisfactory performance.

[0059]

[Table 1]

[0060]

[Table 2]

[0061]

[Table 3]

[0062]

[Table 4]

[0063]

EFFECT OF THE INVENTION The elastic meltblown nonwoven fabric of the present invention has excellent rubber-like elasticity and moderate stress during elongation, does not generate toxic gas during combustion, is recyclable, and does not require a complicated manufacturing process. It is an inexpensive and excellent elastic meltblown nonwoven fabric. Therefore, the elastic melt-blown nonwoven fabric of the present invention, disposable diaper stretchable member, diaper stretchable member, sanitary article stretchable member, sanitary material stretchable member such as diaper cover stretchable member, stretchable tape, adhesive plaster, Stretchable material for clothes, interlining for clothes, insulation material and heat insulation material for clothes,
Protective clothing, hats, masks, gloves, supporters, elastic bandages, base fabrics for compresses, anti-slip fabrics, vibration absorbers, finger cots, air filters for clean rooms, blood filters, various filters such as oil-water separation filters, electrets Processed electret filters, separators, heat insulating materials, coffee bags, food packaging materials, automotive ceiling skin materials, soundproof materials, base materials, cushion materials, speaker dustproof materials, air cleaner materials, insulator skins, backing materials, adhesives Various automobile materials such as non-woven fabric sheets and door trims, various cleaning materials such as cleaning materials for copiers, front and back materials for carpets, agricultural wound cloths, wood drain materials, shoe materials such as sports shoe skins, and bag materials. , As textile products such as industrial sealing materials, wiping materials, and sheets It can be suitably used for developing.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichi Hatada             230 Kawadacho, Moriyama City, Shiga Prefecture Chisso Polypro             Textile Co., Ltd. Fiber Development Laboratory (72) Inventor Naonobu Minamizawa             230 Kawadacho, Moriyama City, Shiga Prefecture Chisso Polypro             Textile Co., Ltd. Fiber Development Laboratory F term (reference) 4F100 AK01B AK03A AK29A AL05A                       AL06A AT00B BA02 DG12B                       DG13B DG15A DG15B JA07A                       JA12A JK07A JK07B JK17                       JL16                 4L047 AA13 AA14 AB10 BA23 CA04                       CA05 CA06

Claims (6)

[Claims] 1. An olefin-based copolymer component (A) having a crystallinity of 0 to 50% and a number average molecular weight (Mn) of 30,000 to 60,000, and a hydrogenated butadiene polymer. An elastic meltblown nonwoven fabric comprising a composition containing 80 to 20% by weight of component (B). 2. The elastic meltblown nonwoven fabric according to claim 1, wherein the hydrogenated butadiene polymer component (B) is an olefin crystal / ethylene / butylene / olefin crystal block copolymer. 3. The olefin copolymer component (A) is a copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms or a copolymer of propylene and an α-olefin having 4 to 10 carbon atoms. Yes, the molecular weight distribution (Mw / Mn) is 1.5
The elastic meltblown nonwoven fabric according to claim 1 or 2, wherein 4. An elastic meltblown nonwoven fabric having an elongation recovery rate of 90% or more at 100% elongation and a stress at 100% elongation of 100 to 300 cN / 25 mm in terms of 100 g / m ^{2 of} basis weight. The elastic meltblown nonwoven fabric according to item 1. 5. An elastic meltblown nonwoven fabric according to any one of claims 1 to 4 laminated with at least one selected from elastic nonwoven fabrics other than said elastic meltblown nonwoven fabric, film, knitted fabric and woven fabric. Composite elastic meltblown non-woven fabric. 6. A fiber product using the elastic melt-blown nonwoven fabric according to any one of claims 1 to 4 or the composite elastic melt-blown nonwoven fabric according to claim 5.