KR101629626B1 - Non-woven fabric laminate and sanitary material - Google Patents

Abstract

(A1) and (A2) wherein the following (I) is more than 60 mass% and not more than 98 mass%, and (II) and (III) are not less than 2 mass% and not more than 40 mass% ) Having a total content of 45 g / m ² or less and a thermal compression ratio of 3 to 30%, wherein the total content of the intermediate layer (B) is larger than that of the surface layers (A1) and (A2).
(I) Propylene homopolymer having a melting point of 140 占 폚 or higher
(II) a random copolymer composed of propylene and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms)
(III) Propylene homopolymer having a melting point of less than 120 占 폚 satisfying the following i to vi
(i) [mmmm] = 20 to 60 mol%
(ii) [rrrr] / (1- [mmmm])? 0.1
(iii) [rmrm] > 2.5 mol%
(iv) [mm] x [rr] / [mr] ² ? 2.0
(v) Mw = 10,000 to 200,000
(vi) Mw / Mn < 4

Description

[0001] NON-WOVEN FABRIC LAMINATE AND SANITARY MATERIAL [0002]

The present invention relates to a nonwoven fabric laminate suitably used for sanitary materials such as paper diapers and sanitary materials.

Generally, a sanitary material such as a paper diaper has a structure in which an absorbent material absorbing and retaining body fluids is wrapped and enclosed in a face sheet disposed on the inner side of the absorbent article and a topsheet disposed on the outer side. The sheet material of this absorbent article is required to have impermeability so that the liquid absorbed by the absorbent material disposed therein is not leaking outward. Further, in order to prevent the water vapor or the like which is generated in the inside of the absorbent article from staying inside the absorbent article and causing sweat to be generated, it is also required to have a moisture permeability for appropriately disseminating water vapor to the outside to dissipate it.

The nonwoven fabric used as the sheet material is usually bonded to other members by heat fusion by heat sealing, and molded into a desired shape. As described above, it is required that the constituent fibers of the nonwoven fabric to be formed by heat fusion have heat sealing property (heat fusion property). As a fiber having the heat sealability, various kinds of fibers have been conventionally provided for practical use and also proposed.

For example, Japanese Patent Application Laid-Open No. 10-96157 discloses a low shrinkable nonwoven fabric layer made of a fiber composed only of a resin mainly composed of a propylene / ethylene random copolymer having an ethylene content of 2.0 to 5.0 mol% and having a dry heat shrinkage ratio of 10% And the sum of the flexibility in the longitudinal and transverse directions is 80 mm or less.

Japanese Patent No. 4352575 discloses a thermoplastic resin composition which comprises a thermoplastic resin (B) having a melting point higher than that of the thermoplastic resin (A) on both surfaces of a nonwoven fabric aggregate (I) comprising a thermoplastic resin (A) A thermoplastic composite nonwoven fabric laminated with a nonwoven fabric aggregate (II), wherein the thermoplastic composite nonwoven fabric is bonded by pressure-sensitive bonding, and the area ratio of heat and pressure is 4 to 30% based on the total area of the nonwoven fabric.

Japanese Unexamined Patent Application Publication No. 2003-53871 discloses a breathable laminate which is a laminate in which a polypropylene nonwoven fabric obtained by spinning a polypropylene resin and a polyethylene spunbonded nonwoven fabric obtained by spinning a polyethylene resin are thermally adhered Lt; / RTI &gt;

However, the above-mentioned conventional fibers sometimes have poor adhesive strength when subjected to heat sealing. In addition, there has been a case where burning occurs or shrinkage occurs when heat sealing is performed (the term &quot; burning &quot; means that part of the fiber is melted by heat due to heat sealing at the surface of the nonwoven fabric laminate, And the flexibility and tactile properties of the nonwoven fabric are impaired. It has been difficult to obtain an excellent heat sealing performance.

In addition, nonwoven fabrics used for sanitary materials such as paper diapers are also required to flexibly respond to changes in the movement and shape of the sanitary material at the time of use, and to have a good touch without giving a so-called stiff texture.

Disclosed is a nonwoven fabric laminated body excellent in heat sealing performance and having high flexibility, and a hygiene material using the same.

Means for solving the above problems are as follows.

(1) A polymer composition comprising a polymer of the following formula (I) in an amount of more than 60 mass% and not more than 98 mass%, a total content [X _a1 ] of a polymer of the following formula (II) % Of a spunbonded nonwoven fabric surface layer (A1) composed of a propylene-based polymer composition (a1)

To the content of the polymer (I) exceeds 60% by weight and 98% by mass or less, of the to less than the total content of [X _a2] is 40 mass% to 2 mass% of the polymer (II) polymer and to (III) of , A spunbonded nonwoven fabric surface layer (A2) composed of a propylene-based polymer composition (a2)

And at least one polymer interposed between the spunbonded nonwoven fabric surface layer (A1) and the spunbond nonwoven fabric surface layer (A2), the polymer of the following formula (II) and the polymer of the following formula (III) in addition to (II) the total content of [X _a1] value and the propylene-based polymer composition of the value of the total content of [X _b] of the polymer of the polymer and to (III) in the propylene-based polymer composition (a1) of ( (B) composed of the propylene-based polymer composition (b) larger than any of the values of the total content [X _a2 ] in the propylene-based polymer composition ( _a2 )

Is laminated,

A total basis weight of 45 g / m ² or less,

And a thermal compression ratio of 3% to 30%.

(I) Propylene homopolymer having a melting point of 140 占 폚 or higher

(II) a random copolymer composed of propylene and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms)

(III) a propylene homopolymer satisfying the following conditions (i) to (vi)

(I) Mesopentad fraction [mmmm] = 20 to 60 mol%

(Ii) [rrrr] / (1- [mmmm]) ≤ 0.1

(Iii) Racemic mesorisemisome fraction [rmrm] > 2.5 mol%

(Iv) [mm] x [rr] / [mr] ² ? 2.0

(V) Weight average molecular weight (Mw) = 10,000 to 200,000

(Vi) Molecular weight distribution (Mw / Mn) < 4

The propylene-based polymer composition (a1) and (a2) constituting the spunbond nonwoven fabric surface layers (A1) and (A2) The nonwoven fabric laminate according to < 1 >, wherein the polymer composition (b) contains 2 parts by mass or less of fatty acid amides having 15 to 22 carbon atoms per 100 parts by mass of the composition.

<3>, and the basis weight of the spunbond nonwoven fabric layer ^{(A1) 1g / m 2 ~15g} / m 2,

The basis weight of the spunbond nonwoven fabric layer (A2) is ^{1g / m 2 ~15g / m 2} ,

Non-woven fabric laminate as described in the basis weight of the spun-bonded non-woven intermediate layer ^{(B) 1g / m 2 ~15g} / m 2 of <1> or <2>.

(4) The propylene-based polymer composition (a1) and the propylene-based polymer composition (a2) constituting the spunbond nonwoven fabric surface layers A1 and A2 and the propylene- The nonwoven fabric laminate according to any one of <1> to <3>, wherein the nonwoven fabric comprises the polymer (II) and does not comprise the polymer (III).

<5> The propylene-based polymer composition (b) constituting the propylene-based polymer composition (a1) and the propylene-based polymer composition (a2) and the spunbonded nonwoven fabric intermediate layer (B) constituting the spunbond nonwoven fabric surface layers A1 and A2, The nonwoven fabric laminate according to any one of the items <1> to <3>, which contains the polymer (III) and does not contain the polymer (II).

<6> A sanitary material comprising the nonwoven fabric laminate according to any one of <1> to <5>.

According to the present invention, it is possible to provide a nonwoven fabric laminate having excellent heat sealing performance and high flexibility and a sanitary material using the same.

In the present specification, the numerical range indicated by using &quot; ~ &quot; indicates a range including numerical values before and after &quot; ~ &quot; as the minimum and maximum values, respectively.

&Lt; Nonwoven fabric laminate &

The nonwoven fabric laminate according to the present invention comprises a spunbonded nonwoven fabric surface layer A1, a spunbonded nonwoven fabric surface layer A2 and a spun bond interposed between the spunbonded nonwoven fabric surface layer A1 and the spunbonded nonwoven fabric surface layer A2 Non-woven fabric intermediate layer (B).

The spunbond nonwoven fabric surface layer (A1) is characterized in that the content of the polymer (I) is more than 60 mass% and not more than 98 mass%, the total content [ _Xa1 ] of the polymer of the following (II) And a propylene-based polymer composition (a1) in a range of 2% by mass or more and less than 40% by mass.

The spunbonded nonwoven fabric surface layer (A2) has a polymer content of more than 60 mass% and not more than 98 mass%, the total content [X _a2 ] of the polymer of the following (II) and the polymer of the following (III) And a propylene-based polymer composition (a2) in a range of 2 mass% or more and less than 40 mass%.

The spunbond nonwoven fabric intermediate layer (B) comprises at least one polymer selected from the group consisting of a polymer of the following formula (II) and a polymer of the following formula (III), further comprising a polymer of the following formula (II) of the total content of [X _a2] of the value and the propylene-based polymer composition (a2) of the total content of [X _a1] according to the value of the total content of [X _b] of the polymer wherein the propylene-based polymer composition (a1) Of the propylene-based polymer composition (b).

On the other hand, the nonwoven fabric laminate according to the present invention has a total basis weight of 45 g / m ² or less and a thermal compression ratio of 3% to 30%.

(I) Propylene homopolymer having a melting point of 140 占 폚 or higher

(II) a random copolymer composed of propylene and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms)

(III) a propylene homopolymer satisfying the following conditions (i) to (vi)

(I) Mesopentad fraction [mmmm] = 20 to 60 mol%

(Ii) [rrrr] / (1- [mmmm]) ≤ 0.1

(Iii) Racemic mesorisemisome fraction [rmrm] > 2.5 mol%

(Iv) [mm] x [rr] / [mr] ² ? 2.0

(V) Weight average molecular weight (Mw) = 10,000 to 200,000

(Vi) Molecular weight distribution (Mw / Mn) < 4

BACKGROUND ART [0002] Conventionally, a nonwoven fabric used for sanitary materials or the like is required to have adhesive strength when heat sealing is performed for bonding between nonwoven fabrics and other materials. In addition, it is required to suppress burning or shrinkage that occurs when heat sealing is performed, that is, excellent heat sealing performance is required.

In addition, it has been further demanded that nonwoven fabrics used for sanitary materials and the like have a good touch without giving a so-called stiff texture to a flexible change in the movement and shape of a sanitary material or the like at the time of use.

However, it has not been easy to obtain a nonwoven fabric having both heat sealing performance and flexibility.

In contrast, the nonwoven fabric laminate according to the present invention has excellent heat sealing performance and high flexibility. This is not necessarily clear, but is presumed as follows.

That is, a random copolymer (hereinafter simply referred to as "specific propylene random copolymer") and (III) composed only of propylene and an α-olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms) in the intermediate layer (B) By containing at least one polymer selected from the group consisting of a propylene homopolymer satisfying the above conditions (i) to (vi) and having a melting point lower than 120 캜 (hereinafter simply referred to as "low crystalline propylene homopolymer" It is considered that a high adhesive strength when heat sealing is performed is achieved.

However, if the content of the specific propylene random copolymer (II) and / or the low crystalline propylene homopolymer on the surface of the nonwoven fabric laminate is too high, burning may occur on the surface due to heat during heat sealing, Is thought to occur. On the other hand, in the present invention, the total content of the polymer (II) and the polymer (III) in the surface layer (A1) and / or the polymer (III) X _a1 ] and the value of the total content [X _a2 ] of the polymer of the polymer (II) and the polymer of the (III) in the surface layer (A2) to the value of the total content [X _b ] It is considered that the generation of burning or shrinkage is suppressed. As a result, it is presumed that an excellent heat sealability is realized.

The nonwoven fabric laminate may further contain (II) a specific propylene random copolymer and / or (III) a low crystalline propylene homopolymer, and the polymer (II) present on the surface of the nonwoven fabric laminate and the It is presumed that high flexibility is achieved by controlling the total content of the polymer to a specific range without excessively lowering it.

The total content [X _a1 ] of the polymer of (II) and the polymer of (III) in the spunbond nonwoven fabric surface layer A1 and the total content [X _a1 ] of the polymer of the polymer (II) in the spunbond nonwoven fabric surface layer If the total content [X _a2 ] of the polymer is less than 2% by mass, high flexibility can not be obtained. On the other hand, if it is 40 mass% or more, burning or shrinkage occurs.

Further, the spun-bonded non-woven intermediate layer (B) (II) polymer and / or the value of the total content of [X _b] of the polymer (III) propylene-based polymer composition (a1) and the propylene-based polymer composition of the (a2) in the Is less than the value of the total content [X _a1 ] and [X _a2 ] in the heat sealability, the adhesive strength at the time of heat sealing and the suppression of occurrence of burning or shrinkage are not achieved, It does not.

Next, the propylene-based polymer compositions (a1), (a2), and (b) constituting the respective layers of the spunbond nonwoven fabric surface layer A1, the spunbond nonwoven fabric surface layer A2 and the spunbonded nonwoven fabric intermediate layer Details will be described.

Surface layers (A1) and (A2) (propylene-based polymer compositions (a1) and (a2))

The propylene-based polymer composition (a1) and the propylene-based polymer composition (a2) each independently comprise (I) a propylene homopolymer having a melting point of 140 캜 or higher in a range of more than 60 mass% and not more than 98 mass%. The content of the propylene homopolymer (I) is preferably 70% by mass or more and 95% by mass or less, more preferably 75% by mass or more and 90% by mass or less.

When the content of the propylene homopolymer (I) in the surface layers (A1) and (A2) is 60 mass% or less, the shrinkage at the time of heat sealing is large and burning tends to occur. On the other hand, if it exceeds 98% by mass, there arises a problem that the adhesive strength at the time of heat sealing is inferior.

Propylene-based polymer compositions (a1) and (a2) each independently comprise (II) a random copolymer (specific propylene random copolymer) composed of propylene and? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms) and (III) wherein (i) ~ melting point of propylene homopolymer of less than 120 ℃ (low-crystalline propylene homopolymer), a total content of [X _a1], more than 2 wt.% to [X _a2] 40 parts by mass to satisfy the (vi) % &Lt; / RTI &gt; The total content of the polymer of the polymer, and (III) in _{(II) [X a1],} [X a2] is also at least 5 mass% to 8% by mass is preferable, and the range of not more than 30 mass% of more than 25% by weight Is more preferable.

Intermediate layer (B) (propylene-based polymer composition (b))

The propylene-based polymer composition (b) is a random copolymer (specific propylene random copolymer) composed only of propylene and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms) and (III) And at least one polymer selected from the group consisting of propylene homopolymers (low crystalline propylene homopolymers) having a melting point of less than 120 ° C and satisfying the following (vi) to (vi). On the other hand, (II) polymer and (III) the value of the total content of [X _b] of the polymer wherein the propylene-based polymer composition (a1) a total content of the value of [X _a1] and propylene-based polymer composition in the (a2) Of the total content [X _a2 ] in the film.

The total content of [X _b] of the propylene-based polymer composition (b) (II) polymer and (III) of the of the polymer, specifically, is more than 60 mass% of more than 100% by mass is preferable, and 70 mass More preferably not less than 100% by mass, and more preferably not less than 80% by mass and not more than 99.7% by mass.

The propylene-based polymer composition (b) may also contain (I) a propylene homopolymer having a melting point of 140 ° C or higher. The content of the propylene homopolymer (I) in the propylene-based polymer composition (b) is preferably 0 mass% or more and 40 mass% or less, more preferably 0 mass% or more and 20 mass% or less.

(I) Propylene homopolymer having a melting point of 140 占 폚 or higher

The propylene homopolymer (I) having a melting point of 140 占 폚 or higher in the present invention is a homopolymer obtained by polymerization of propylene.

The MFR (measured at a temperature of 230 DEG C under a load of 2.16 kg in accordance with ASTM D1238) of the propylene homopolymer (I) is preferably in the range of 40 to 80 g / 10 min, more preferably 50 to 70 g / 10 min.

When the MFR is within the above range, there is an advantage that the range of the spunbond nonwoven fabric during manufacture is wide and the obtained nonwoven fabric has excellent flexibility.

(I) a density of the propylene homopolymer is in the range of 0.1~5.0g / cm ³ is preferred, more preferably 0.5~2.0g / cm ^3.

When the density is within the above range, the propylene-based polymer composition is improved in mixing property, the production is stabilized, and the quality gap of the nonwoven fabric is minimized.

The melting point (Tm) of the propylene homopolymer (I) is 140 占 폚 or higher, preferably 140-180 占 폚, and more preferably 150-170 占 폚.

When the melting point is within the above range, there is an advantage that the bag range at the time of producing the spunbonded nonwoven fabric is wide and the obtained nonwoven fabric has excellent flexibility.

(II) a random copolymer (propylene random copolymer) comprising only propylene and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms)

The propylene random copolymer (II) in the present invention is a random copolymer of propylene alone and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms).

Examples of the? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms) include ethylene, butene, pentene, hexene, octene, 4-methyl-1-pentene, , 1-hexadecene, and the like.

Of these, ethylene and butene are more preferable.

The? -Olefin may be used singly or in combination of two or more.

(Propylene: other? -Olefin (molar ratio)) of propylene to another? -Olefin in the specific propylene random copolymer (II) is preferably in the range of 99.5: 0.5 to 90: , More preferably in the range of 98: 2 to 95: 5.

When the ratio of other? -Olefins to propylene is not lower than the above lower limit, there is an advantage that the adhesive strength at the time of heat sealing is excellent. On the other hand, when the temperature is lower than or equal to the upper limit, shrinkage at the time of heat sealing is minimized and burning is less likely to occur.

(II) The MFR of a specific propylene-based random copolymer (measured at a temperature of 230 DEG C under a load of 2.16 kg in accordance with ASTM D1238) is preferably in the range of 40 to 80 g / 10 min, more preferably in the range of 50 to 70 g / 10 min Do.

When the MFR is within the above range, the range of the bag at the time of producing the spunbonded nonwoven fabric is wide, and the flexibility of the obtained nonwoven fabric is advantageous.

(II) the density of the specific propylene-based random copolymer is in the range of 0.1~5.0g / cm ³ is preferable, and more preferably 0.5~2.0g / cm ^3.

When the density is within the above range, the propylene-based polymer composition is improved in mixing property, the production is stabilized, and the quality gap of the nonwoven fabric is minimized.

(II) The melting point (Tm) of a specific propylene-based random copolymer is preferably in the range of 50 to 170 캜.

The melting point (Tm) of the specific propylene random copolymer (II) is preferably in the range of 120 to 160 캜 from the viewpoint that the bag range at the time of producing the spunbonded nonwoven fabric is wide and the flexibility of the obtained nonwoven fabric is excellent More preferably from 130 to 150 캜, and even more preferably from 130 to 147 캜.

Propylene homopolymer (low crystalline propylene homopolymer) having a melting point of less than 120 占 폚 satisfying (III) (i) to (vi)

The low crystalline propylene homopolymer (III) in the present invention is a homopolymer obtained by polymerizing propylene and has a melting point of less than 120 占 폚 and satisfies the following requirements (i) to (vi).

(i) Mesopentad fraction [mmmm] = 20 to 60 mol%

(III) If the meso pentad fraction [mmmm] of the low crystalline propylene homopolymer is 20 mol% or more, the occurrence of stickiness is suppressed. On the other hand, if it is 60 mol% or less, the degree of crystallization does not become excessively high, so that the elastic recovery property becomes good. The meso pentad 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 mesoracic meso pentad fraction [rmrm] described later are reported in A. Zambelli et al., Macromolecules, 6, 925 1973), the meso fraction, the racemic fraction, and the racemic mesoracic meso fraction in the pentad unit of the polypropylene molecular chain measured by the methyl group signal in the ¹³ C-NMR spectrum . When the meso pentad fraction [mmmm] becomes larger, the stereoregularity becomes higher. Further, the triad fractions [mm], [rr] and [mr] described later are also calculated by the above method.

On the other hand, the measurement of the ¹³ C-NMR spectrum can be carried out according to A. Zambelli et al., "Appearance of Macromolecules, 8, 687 (1975)

Apparatus: ¹³ C-NMR apparatus of JNM-EX400 type manufactured by Nippon Denshi K.K.

Method: Proton Perfect Decoupling Method

Concentration: 220 mg / ml

Solvent: 1,2,4-trichlorobenzene and heavy benzene in a 90:10 (volume ratio) mixed solvent

Temperature: 130 ° C

Pulse width: 45 °

Pulse repetition time: 4 seconds

Total: 10,000 times

<Formula>

M = m / S x 100

R = gamma / S x 100

S = P? Beta + P? Beta + P?

  S: Signal intensity of side chain methyl carbon atoms of all propylene units

  P beta beta: 19.8-22.5 ppm

  Pαβ: 18.0 to 17.5 ppm

  P?: 17.5 to 17.1 ppm

  γ: racemic pentad chain: 20.7 to 20.3 ppm

  m: mesopentad chain: 21.7 to 22.5 ppm

(ii) [rrrr] / (1- [mmmm])? 0.1

The value of [rrrr] / [1-mmmm] is an index showing the uniformity of the regularity distribution of the low crystalline propylene homopolymer (III) obtained from the above pentad unit fractions. When this value is increased, it becomes a mixture of high order polypropylene and atactic polypropylene like conventional polypropylene produced using existing catalyst systems, which causes stickiness.

(III) In the low crystalline propylene homopolymer, when [rrrr] / (1- [mmmm]) is 0.1 or less, stickiness in the obtained elastic nonwoven fabric is suppressed. From this viewpoint, [rrrr] / (1- [mmmm]) is preferably 0.05 or less, and more preferably 0.04 or less.

(iii) Racemic mesorisemisome fraction [rmrm] > 2.5 mol%

(III) If the content of [rmrm] of the low-crystalline propylene homopolymer exceeds 2.5 mol%, the randomness of the low-crystalline propylene homopolymer is increased and the elastic recovery property of the elastic nonwoven fabric Is further improved. [rmrm] is preferably 2.6 mol% or more, and more preferably 2.7 mol% or more. The upper limit thereof is usually about 10 mol%.

(iv) [mm] x [rr] / [mr] ² ? 2.0

[mm] x [rr] / [mr] ² is an index of the randomness of the low crystalline propylene homopolymer (III). When this value is 2.0 or less, the elastic nonwoven fabric has sufficient elastic restorability, The stumbling is also suppressed. The closer [mm] x [rr] / [mr] ² is to 0.25, the higher the randomness. [Mm] x [rr] / [mr] ² is preferably more than 0.25 and not more than 1.8, more preferably 0.5 to 1.5 from the viewpoint of obtaining sufficient elastic recovery properties.

(v) Weight average molecular weight (Mw) = 10,000 to 200,000

(III) When the low-crystalline propylene homopolymer has a mass average molecular weight of 10,000 or more, the viscosity of the low-crystalline propylene homopolymer is not excessively low and is appropriate, and therefore, the yarn breakage during production of the elastic non- do. When the mass average molecular weight is 200,000 or less, the viscosity of the low-crystalline propylene homopolymer is not excessively high, and the radioactivity improves. The mass average molecular weight is preferably 30,000 to 150,000, more preferably 50,000 to 150,000.

The measurement method of the mass average molecular weight will be described later.

(vi) Molecular weight distribution (Mw / Mn) < 4

(III) In the low crystalline propylene homopolymer, if the molecular weight distribution (Mw / Mn) is less than 4, the occurrence of stickiness of the elastic nonwoven fabric is suppressed. The molecular weight distribution is preferably 3 or less.

The mass average molecular weight (Mw) is a mass average molecular weight in terms of polystyrene measured by a gel permeation chromatography (GPC) method under the following conditions and conditions, and the molecular weight distribution (Mw / Mn) Is a value calculated from one 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

Measuring 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)

The low crystalline propylene homopolymer (III) used in the present invention preferably further satisfies the following requirement (vii).

(vii) Melting point (Tm-D) = 0 to 120 DEG C

(III) The low-crystalline propylene homopolymer was kept at -10 ° C for 5 minutes under a nitrogen atmosphere using a differential scanning calorimeter (DSC), and then heated at a rate of 10 ° C / (Tm-D), which is defined as a peak top of the peak observed on the side of the catalyst layer (B), is preferably 0 to 120 deg.

When the melting point (Tm-D) of the low-crystalline propylene homopolymer is 0 占 폚 or more, the occurrence of stickiness of the elastic nonwoven fabric is suppressed, and when it is 120 占 폚 or less, sufficient elastic recovery property is obtained. From this viewpoint, the melting point (Tm-D) is more preferably 0 to 100 占 폚.

The melting point (Tm-D) was maintained at -10 占 폚 for 5 minutes in a nitrogen atmosphere using a differential scanning calorimeter (DSC-7, manufactured by Perkin Elmer Co.) As a peak top of a peak observed on the hottest side of the melting endothermic curve obtained by the above method.

Such a (III) low crystalline propylene homopolymer can be synthesized using a homogeneous catalyst called a so-called metallocene catalyst, for example, as described in WO2003 / 087172.

Examples of the low-crystalline propylene homopolymer (III) as described above include L-MODU S901 manufactured by Idemitsu Kosan Co., Ltd. or L-MODU S 600 manufactured by Idemitsu Kosan Co., Ltd. and the like.

Fatty acid amides having 15 to 22 carbon atoms

The propylene-based polymer compositions (a1), (a2) and (b) constituting the surface layer (A1), (A2) and the intermediate layer (B) of the present invention contain a fatty acid amide having 15 or more carbon atoms . The amount thereof is preferably 2 parts by mass or less based on 100 parts by mass of each composition. At least one of the propylene-based polymer compositions (a1) and (a2) constituting the surface layers (A1) and (A2) and the propylene-based polymer composition (b) constituting the intermediate layer (B) It is preferable that the fatty acid amide is contained in an amount of 2 parts by mass or less based on 100 parts by mass of the composition, from the viewpoint of compatibility between flexibility and processability. When the propylene-based polymer composition (a1), (a2) or (b) contains a fatty acid amide having a carbon number of 15 or more and 22 or less, it is more preferable that each of the propylene type polymer composition contains 0.6 parts by mass or less based on 100 parts by mass of the composition.

Examples of the fatty acid amide having 15 to 22 carbon atoms include a fatty acid monoamide compound, a fatty acid diamide compound, a saturated fatty acid monoamide compound and an unsaturated fatty acid diamide compound. On the other hand, the carbon number in the present invention means the number of carbon atoms contained in the molecule, specifically, the number of carbon atoms contained in the molecule, such as palmitic acid amide (C 16), stearic acid amide (C 18), oleic acid amide Amide (having 22 carbon atoms) and the like. A plurality of these may be used in combination. On the other hand, C in the -CONH constituting the amide is also included in the carbon number. The carbon number of the fatty acid amide is more preferably 18 or more and 22 or less.

Among these fatty acid amide compounds, oleic acid amide or erucic acid amide is preferred in the present invention. By using them, a nonwoven fabric having excellent flexibility, touch, and strength can be obtained.

· Other additives

Other additives may be further added to the propylene-based polymer compositions (a1), (a2), and (b) constituting the surface layer (A1), (A2) and the intermediate layer (B) in the present invention. Examples of the additive include lubricants, colorants, stabilizers, nucleating agents, antioxidants, weather stabilizers, heat stabilizers, antistatic agents, antifog agents, fillers, slip agents, pigments, natural oils, synthetic oils, waxes, anti- , A hydrochloric acid absorbent, and a hydrophilic agent.

Examples of the lubricant include dimethylsiloxane and the like. Examples of the coloring agent include inorganic coloring agents such as TiO ₂ and CaCO ₃ , organic coloring agents such as phthalocyanine, and the like.

· Physical properties (basis weight)

The total basis weight of the nonwoven fabric laminate in the present invention is 45 g / m ² or less. When the total basis weight exceeds 45 g / m ² , there arises a difficulty in that flexibility and air permeability are inadequate for use in the use of sanitary materials such as diapers.

On the other hand, the total basis weight is also more preferably in the range of preferably in the range of 5~40g / m ² and, 10~30g / m ^2.

In addition, the surface layer (A1), each having a basis weight of (A2), and the intermediate layer (B) are, each independently, in the range of 1~15g / m ² preferred, and more preferably in the range of 3~10g / m ² Do.

When the basis weight is within the above range, it is advantageous in that it is excellent in flexibility, touch, body suitability, followability, drapeability, economy, and see-through property.

· Production of nonwoven laminated body

The lamination of the surface layer (A1), (A2) and the intermediate layer (B) in the present invention is performed by forming each layer in accordance with the spunbond method. That is, the spunbonded nonwoven fabric surface layer A1 is formed by using the propylene-based polymer composition (a1), and then the spunbonded nonwoven fabric intermediate layer (B) is formed on the surface layer (A1) do. And a spunbonded nonwoven fabric intermediate layer (A2) is formed on the intermediate layer (B) using the propylene-based polymer composition (a2).

Here, in the spunbond method, for example, the propylene-based polymer composition is spun from a spinning nozzle, the filament that has been spun is cooled by a cooling fluid or the like, tension is applied to the filament by stretched air, And collecting the obtained filaments on a moving collecting belt.

Thus, the laminate having the surface layer A1, the intermediate layer (B) and the surface layer (A2) laminated thereon is heat-pressed at a thermal compression ratio of 3% to 30% to obtain a nonwoven fabric laminate.

Examples of the method of thermocompression include a method of heating and pressing with an embossing roll, thermal embossing bonding, ultrasonic embossing bonding, hot air through bonding, water jet bonding, needle punching and bonding by an adhesive.

The thermal compression ratio is controlled in the range of 3% to 30% as described above, preferably in the range of 3 to 25%, more preferably in the range of 5 to 22%.

If the thermocompression rate is less than the above lower limit value, the strength of the resultant nonwoven fabric laminate is lowered, which leads to a disadvantage that it becomes insufficient for use. On the other hand, when the upper limit is exceeded, there is a disadvantage that flexibility, tactile feeling, followability, and drape property of the resultant nonwoven fabric laminate are deteriorated.

The mass fraction of the specific propylene random copolymer in the nonwoven fabric laminate according to the present invention thus obtained is preferably in the range of 30 to 60%, more preferably in the range of 35 to 50% A range of 38 to 45% is more preferable.

<Hygiene materials>

The nonwoven fabric laminate according to the present invention has excellent heat sealability and high flexibility. Therefore, the nonwoven fabric laminate of the present invention is suitably used for sanitary materials such as paper diapers and sanitary napkins.

In addition, it is suitable for various industrial uses such as towels, bandages, medical use, sanitary materials, packaging materials, and the like.

Example

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

The physical properties and the like in Examples and Comparative Examples were measured by the following methods.

(1) Basis weight [g / m ² ]

Six specimens of 200 mm (MD) x 50 mm (CD) were taken from the spunbond nonwoven fabric or laminate. On the other hand, there were 6 collection sites. Subsequently, each of the test specimens thus obtained was measured for mass (g) using an upper plate electronic balance (manufactured by GENESI INDUSTRIAL CO., LTD.), And the average value of the mass of each test piece was obtained. G / m &lt; ² &gt;] of the nonwoven fabric or the laminate was obtained by converting the weight of the nonwoven fabric or the laminate into a mass (g) per 1 m ² from the obtained average.

(2) Evaluation of heat sealability

[Heat Sealing Method]

Ten test pieces of 100 mm (MD) x 100 mm (CD) were taken from the spunbond nonwoven fabric laminate. Then, the two test pieces were superimposed on each other so that their MD directions were the same, and heat sealing was carried out under the following conditions using a heat seal tester (trade name: Heat Seal Tester) manufactured by Tester Industry Co.,

Seal bar width: 10.0mm

Sealing pressure: 2.0 kg / cm ²

Seal time: 1.0 second

Seal temperature: The upper bar and lower bar were kept at the same temperature, and 168 占 폚 and 172 占 폚

Sealing direction: MD and vertical

[Heat seal strength [N / 40 mm]]

Using a constant speed tensile tester (manufactured by Toyo Seiki Seisaku-sho, Ltd., product name: Strograph), the tensile peel test of the test pieces subjected to the heat sealing under the above conditions was carried out in each of the following five conditions under the following conditions, The average value was defined as the heat seal strength.

Specimen shape: width 40 mm, length 70 mm

Tensile speed: 300 mm / min

Ambient temperature during measurement: 23 ℃

[Heat resistance at heat sealing (burning)]

Test pieces subjected to heat sealing under the above conditions were observed for occurrence of burning and evaluated based on the following criteria.

-Evaluation standard-

A: Burning of the heat seal part did not occur

B: Some burning occurred in the heat seal part

C: Burning of the heat seal part was remarkable.

[Shape stability (shrinkage) upon heat sealing]

Test pieces subjected to heat sealing under the above conditions were observed for occurrence of shrinkage and evaluated based on the following criteria.

-Evaluation standard-

A: There was no shrinkage of the specimen with the heat seal

B: Shrinkage of test specimen with heat seal was observed

C: Significant shrinkage was observed in the test piece with heat sealing

(3) Flexibility evaluation

[Flexibility (touch)]

With regard to the spunbonded nonwoven fabric laminate, the sensation when touching with the hand was directly evaluated for sensory evaluation based on the following criteria.

-Evaluation standard-

A: Very good touch and excellent flexibility

B: The feeling was good, and the flexibility was excellent in comparison with the evaluation C below.

C: The softness is hard and the flexibility is poor.

[Lecture performance (Cantilever)]

The cantilever test was conducted by the following method to measure the lubrication properties [mm] of the spunbond nonwoven fabric laminate.

Specifically, it conforms to 8.21.1 [Method A (45 ° cantilever method)] of JIS-L1096 (2010).

Five test specimens of 2 cm x 15 cm were taken from the specimens in the longitudinal and transverse directions, respectively. The surface of the 45-degree slope was placed on a smooth horizontal table with the short side of the specimen aligned with the scale baseline. Next, the test piece was gently slid in the direction of the slope by an appropriate method, and the position of the other end was read by the scale when the center point of one end of the test piece was in contact with the slope. The laminating degree is represented by the length (mm) in which the test piece travels, and five sheets each are measured to obtain an average value in each of the longitudinal direction (MD) and the lateral direction (CD) The second digit was calculated by using a straight line.

Lecture degree = {(average value of MD ² + average value of CD ² ) / 2} ^(1/2)

[Example 1]

<Production of Spunbonded Nonwoven Fabric Laminate>

89.7% by mass of a propylene homopolymer (1) having an MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) Propylene random copolymer (2) (a copolymer of propylene and ethylene, a polymerization molar ratio of 97: 3) having a melt flow rate of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 142 ° C, 10 mass%, and 0.3 mass% of erucic acid amide was melted using an extruder of 75 mmφ, and a spunbonded nonwoven fabricator having a spinneret having a hole number of 537 holes (length in the direction perpendicular to the flow direction of the machine on the collecting surface : 800 mm), melt spinning was carried out by the spunbond method under conditions of both a resin temperature and a die temperature of 240 占 폚, a cooling air temperature of 20 占 폚, and a drawn air air velocity of 5233 m / min to form a first layer Deposited.

Then, a propylene random copolymer having a MFR of 60 g / 10 min, a density of 0.91 g / cm ³ , and a melting point of 142 占 폚 was measured on the first layer deposited surface in accordance with ASTM D1238 at a temperature of 230 占 폚 under a load of 2.16 kg (2) A mixture of 99.7% by mass of erucic acid amide and 0.3% by mass of erucic acid amide was melted using an extruder of 75 mmφ, and a spunbonded nonwoven fabricator having a spinneret having a hole number of 537 holes Direction length: 800 mm) was spun by a spunbond method under conditions of both a resin temperature and a die temperature of 240 占 폚, a cooling air temperature of 20 占 폚, and a drawn air air velocity of 5233 m / min to deposit as a second layer .

Subsequently, the third layer was deposited by the same method as the first layer to obtain a three-layer deposit. The sediment embossing roll hot pressing process the (embossing area percentage (thermal compression rate) of 18%, embossing temperature ℃ 135) to the total basis weight of 17.0g / m ^2, the basis weight of each layer of 1 to 3-layer 5.67g / m ² (The mass fraction of the propylene random copolymer in the total amount was 40.0%).

The spunbonded nonwoven fabric laminate thus obtained was excellent in soft touch and excellent in flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. The spunbonded nonwoven fabric laminate had good heat resistance at the time of heat sealing, and burning of the heat seal portion did not occur. In addition, since the shrinkage of the test piece accompanying the heat seal was small, the form stability was excellent.

[Example 2]

<Production of Spunbonded Nonwoven Fabric Laminate>

, 79.7% by mass of a propylene homopolymer (1) having an MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) conforming to, temperature 230 ℃, measured under a load of 2.16kg) 60g / 10 min, density of 0.91g / cm ^3, a melting temperature of 142 ℃ propylene random copolymer (2) 20 mass%, erucic acid amide in the mixture 0.3% by mass in A propylene homopolymer (1) having a MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured in accordance with ASTM D1238 at a temperature of 230 캜 under a load of 2.16 kg) And 89.7% by mass of a propylene random copolymer (2) having a MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 142 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) A spunbonded nonwoven fabric laminate was prepared in the same manner as in Example 1 except that a mixture of 0.3 mass% of lauric acid amide was used in the second layer It accounted for more than 43.3% mass fraction).

The spunbonded nonwoven fabric laminate thus obtained was excellent in soft touch and excellent in flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. The spunbonded nonwoven fabric laminate had good heat resistance at the time of heat sealing, and burning of the heat seal portion did not occur. In addition, since the shrinkage of the test piece accompanying the heat seal was small, the form stability was excellent.

[Comparative Example 1]

&Lt; Preparation of spunbond nonwoven fabric >

99.7% by mass of a propylene homopolymer (1) having a MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238), 0.3 mass of erucic acid amide % Was melted using an extruder of 75 mmφ, and a spunbonded nonwoven fabric molding machine (length in the direction perpendicular to the flow direction of the machine on the collecting surface: 800 mm) having a spinneret having a hole number of 537 holes was used, Melt spinning was carried out by the spunbond method under the conditions of all of the die temperature of 240 占 폚, the cooling air temperature of 20 占 폚 and the drawn air air velocity of 5233 m / min, and deposited as the first layer on the collecting surface.

This sponge was subjected to heat press treatment (embossing area ratio (thermal compression ratio) of 18% and embossing temperature of 135 캜) with an embossing roll to prepare a spunbonded nonwoven fabric having a total basis weight of 17.0 g / m ² .

The spunbonded nonwoven fabric thus obtained was hard to feel and had poor flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. The spunbonded nonwoven fabric had good heat-resistance at the time of heat sealing, and burning of the heat-sealed portion did not occur. In addition, since the shrinkage of the test piece accompanying the heat seal was small, the form stability was excellent.

[Comparative Example 2]

&Lt; Preparation of spunbond nonwoven fabric >

89.7% by mass of a propylene homopolymer (1) having an MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) conforming to, temperature 230 ℃, measured under a load of 2.16kg) 60g / 10 min, density of 0.91g / cm ^3, a melting temperature of 142 ℃ propylene random copolymer (2) 10 mass%, erucic acid amide in the mixture 0.3% by mass in A spunbonded nonwoven fabric was produced in the same manner as in Comparative Example 1, except that it was used.

The spunbonded nonwoven fabric thus obtained was hard to feel and had poor flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. The spunbonded nonwoven fabric had good heat-resistance at the time of heat sealing, and burning of the heat-sealed portion did not occur. In addition, since the shrinkage of the test piece accompanying the heat seal was small, the form stability was excellent.

 [Comparative Example 3]

&Lt; Preparation of spunbond nonwoven fabric >

, 79.7% by mass of a propylene homopolymer (1) having an MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) conforming to, temperature 230 ℃, measured under a load of 2.16kg) 60g / 10 min, density of 0.91g / cm ^3, a melting temperature of 142 ℃ propylene random copolymer (2) 20 mass%, erucic acid amide in the mixture 0.3% by mass in A spunbonded nonwoven fabric was produced in the same manner as in Comparative Example 1, except that it was used.

The spunbonded nonwoven fabric thus obtained was hard to feel and had poor flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. When the spun-bonded nonwoven fabric was heat-sealed, a slight burning occurred in the heat-sealed portion. The shrinkage of the test piece was also observed with the heat seal.

[Comparative Example 4]

&Lt; Preparation of spunbond nonwoven fabric >

A propylene homopolymer (1) having an MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) conforming to, temperature 230 ℃, measured under a load of 2.16kg) 60g / 10 min, density of 0.91g / cm ^3, a melting temperature of 142 ℃ propylene random copolymer (2), erucic acid amide mixture of 0.3% by mass to 30% by weight, A spunbonded nonwoven fabric was produced in the same manner as in Comparative Example 1, except that it was used.

The spunbonded nonwoven fabric laminate thus obtained was excellent in soft touch and excellent in flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. When the spunbonded nonwoven fabric was heat-sealed, the burning of the heat-sealed portion was remarkable. Also, with the heat seal, significant shrinkage was observed in the test piece.

[Comparative Example 5]

&Lt; Preparation of spunbond nonwoven fabric >

59.7% by mass of a propylene homopolymer (1) having an MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238) conforming to, temperature 230 ℃, measured under a load of 2.16kg) 60g / 10 min, density of 0.91g / cm ^3, a melting temperature of 142 ℃ propylene random copolymer (2), erucic acid amide mixture of 0.3% by mass to 40% by weight, A spunbonded nonwoven fabric was produced in the same manner as in Comparative Example 1, except that it was used.

The spunbonded nonwoven fabric laminate thus obtained was excellent in soft touch and excellent in flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. When the spunbonded nonwoven fabric was heat-sealed, the burning of the heat-sealed portion was remarkable. Also, with the heat seal, significant shrinkage was observed in the test piece.

[Comparative Example 6]

<Production of Spunbonded Nonwoven Fabric Laminate>

99.7% by mass of a propylene homopolymer (1) having a MFR of 60 g / 10 min, a density of 0.91 g / cm ³ and a melting point of 160 캜 (measured at a temperature of 230 캜 under a load of 2.16 kg in accordance with ASTM D1238), 0.3 mass of erucic acid amide % Was used for the first layer and the third layer, a spunbonded nonwoven fabric laminated body was produced in the same manner as in Example 1 (the mass fraction of the propylene random copolymer in the total amount was 33.3%).

The thus obtained spunbonded nonwoven fabric laminate had a somewhat hard feeling in touch and was insufficient in flexibility.

&Lt; Measurement of Heat Seal Strength >

Table 1 shows the results of measuring the heat seal strength. The spunbonded nonwoven fabric laminate had good heat resistance at the time of heat sealing, and burning of the heat seal portion did not occur. In addition, since the shrinkage of the test piece accompanying the heat seal was small, the form stability was excellent.

<Fuzzy Arise>

Two CD specimens of 150 mm (MD) x 150 mm (CD) were taken from each nonwoven fabric. On the other hand, there were two arbitrary sampling sites. Then, each of the test specimens thus obtained was subjected to a friction test in accordance with the friction fastness test method of JIS-L0849 (2013), using an academic type friction resistance tester (manufactured by Dai-ichi Kogyo Seiki Seisaku KK, new type NR-100). On the other hand, a cloth tape (No. 1532, manufactured by Terahoka Seisakusho Co., Ltd.) was attached to the side of the rubbing member, and the non-embossed side was reciprocated 50 times in the MD direction with a load of 300 g in a dry state. The lint rise state was rated on the basis of the following criteria, and the worse (lower) rank was regarded as lint rise (dot) of each nonwoven fabric sample.

Class 1: The fiber is peeled off enough to break the specimen.

Class 2: The fibers are severely peeled off to such an extent that the specimen is thin.

2.5 grade: The curl node is clearly visible, and the fiber begins to rise at multiple locations.

Grade 3: Certain curly nodes begin to appear, or small curly nodes appear multiple.

3.5 grade: Lots of fluffy enough to begin to form small curls at one place.

Level 4: No fuzziness.

The results of the evaluation of the nonwoven fabric laminate obtained in the above Examples and Comparative Examples are shown in Table 1 below.

On the other hand, the disclosure of Japanese Patent Application No. 2014-104617 is incorporated herein by reference in its entirety.

All publications, patent applications, and technical specifications described in this specification are herein incorporated by reference into the present specification to the same extent as if each individual publication, patent application, and technical specification were specifically and individually indicated to be incorporated by reference. do.

Claims (6)

, Wherein the content of the polymer (I) is more than 60 mass% and not more than 98 mass%, the total content [X _a1 ] of the polymer of the following formula (II) and the polymer of the following formula (III) is not less than 2 mass% , A spunbonded nonwoven fabric surface layer (A1) composed of a propylene-based polymer composition (a1)
To the content of the polymer (I) exceeds 60% by weight and 98% by mass or less, of the to less than the total content of [X _a2] is 40 mass% to 2 mass% of the polymer (II) polymer and to (III) of , A spunbonded nonwoven fabric surface layer (A2) composed of a propylene-based polymer composition (a2)
And at least one polymer interposed between the spunbonded nonwoven fabric surface layer (A1) and the spunbond nonwoven fabric surface layer (A2), the polymer of the following formula (II) and the polymer of the following formula (III) in addition to (II) the total content of [X _a1] value and the propylene-based polymer composition of the value of the total content of [X _b] of the polymer of the polymer and to (III) in the propylene-based polymer composition (a1) of ( (B) composed of the propylene-based polymer composition (b) larger than any of the values of the total content [X _a2 ] in the propylene-based polymer composition ( _a2 )
Is laminated,
A total basis weight of 45 g / m ² or less,
And a thermal compression ratio of 3% to 30%.
(I) Propylene homopolymer having a melting point of 140 占 폚 or higher
(II) a random copolymer composed of propylene and an? -Olefin having 2 to 20 carbon atoms (excluding 3 carbon atoms)
(III) a propylene homopolymer satisfying the following conditions (i) to (vi)
(I) Mesopentad fraction [mmmm] = 20 to 60 mol%
(Ii) [rrrr] / (1- [mmmm]) ≤ 0.1
(Iii) Racemic mesorisemisome fraction [rmrm] > 2.5 mol%
(Iv) [mm] x [rr] / [mr] ² ? 2.0
(V) Weight average molecular weight (Mw) = 10,000 to 200,000
(Vi) Molecular weight distribution (Mw / Mn) < 4 The method according to claim 1,
Wherein the propylene-based polymer composition (b1) constituting the spunbonded nonwoven fabric intermediate layer (B) and at least one of the propylene-based polymer compositions (a1) and (a2) constituting the spunbonded nonwoven fabric surface layers (A1) b) contains 2 parts by mass or less of fatty acid amide having 15 to 22 carbon atoms per 100 parts by mass of the composition. The method according to claim 1,
And the basis weight of the spunbond nonwoven fabric layer ^{(A1) 1g / m 2 ~15g} / m 2,
The basis weight of the spunbond nonwoven fabric layer (A2) is ^{1g / m 2 ~15g / m 2} ,
The spun-bonded non-woven intermediate layer (B) nonwoven fabric laminate basis weight of 1g / m ² ~15g / m ² of. The method according to claim 1,
Wherein the propylene-based polymer composition (a1) and the propylene-based polymer composition (a2) constituting the spunbond nonwoven fabric surface layers A1 and A2 and the propylene-based polymer composition (b) constituting the spunbond nonwoven fabric intermediate layer (B) A nonwoven fabric laminate comprising the polymer of the above (II) and not containing the polymer of (III). The method according to claim 1,
Wherein the propylene-based polymer composition (a1) and the propylene-based polymer composition (a2) constituting the spunbond nonwoven fabric surface layers A1 and A2 and the propylene-based polymer composition (b) constituting the spunbond nonwoven fabric intermediate layer (B) A nonwoven fabric laminate comprising the polymer of the above (III) and not containing the polymer of (II). A sanitary material comprising the nonwoven fabric laminate according to any one of claims 1 to 5.