WO2016093303A1

WO2016093303A1 - Elastic laminate, article containing same, stretched elastic laminate article, and article containing same

Info

Publication number: WO2016093303A1
Application number: PCT/JP2015/084624
Authority: WO
Inventors: 公平武田; 生島　伸祐; 翔内田
Original assignee: 日東電工株式会社
Priority date: 2014-12-12
Filing date: 2015-12-10
Publication date: 2016-06-16
Also published as: PL3231604T3

Abstract

Provided is an elastic laminate that has excellent handling properties and excellent blocking resistance. Also provided is an article containing the elastic laminate. Also provided is a stretched elastic laminate article obtained by pre-stretching the elastic laminate body. Also provided is an article containing the stretched elastic laminate article. The elastic laminate comprises an olefin resin layer on at least one side of an elastomer layer. In a stress-strain diagram representing a procedure in which the elastic laminate is stretched to a stretch rate of 400% at a pulling speed of 1000 mm/minute and subsequently returned to a stretch rate of 0% at a pulling speed of 1000 mm/minute, an upper yield point is present in the interval from a stretch rate of 0% to a stretch rate of 100%, a lower yield point is present in the interval from the upper yield point to a stretch rate of 400%, and the difference between the yield stress of the upper yield point and the yield stress of the lower yield point is 0.05 N/30 mm width or more.

Description

Stretchable laminate, article including the same, stretchable laminate extension, and article including the same

The present invention relates to an elastic laminate and an article including the same. The present invention also relates to a stretchable laminate extension and an article containing the same.

Various stretchable laminates have been proposed for articles such as sanitary goods such as diapers and masks.

As such a member, an elastic laminate having an elastomeric resin layer on at least one side of the elastomer layer has been proposed (for example, Patent Document 1).

However, such a conventional stretchable laminate exhibits an elastic property immediately after it is manufactured, so that the handleability is poor and, for example, it is difficult to perform an operation of incorporating it into an article such as a sanitary article such as a diaper or a mask. There is a problem.

In addition, layers made of elastomeric resins (for example, olefin-based elastomers and styrene-based elastomers) are likely to be blocked when they are laminated. For this reason, for example, when the stretchable laminate is made into a roll body in a state where layers made of elastomeric resin are laminated, the layers made of elastomeric resin are easily blocked. Therefore, rewinding tends to be difficult.

US Patent Application Publication No. 2011/0177735

The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a stretchable laminate having excellent handling properties and excellent blocking resistance. Moreover, it is providing the articles | goods containing such a stretchable laminated body. It is another object of the present invention to provide a stretchable stretched product obtained by pre-stretching such a stretchable laminate. Moreover, it is providing the articles | goods containing such an elastic | stretch laminated body elongate.

The stretchable laminate of the present invention is
An elastic laminate having an olefinic resin layer on at least one side of the elastomer layer,
In the SS data diagram of the operation of stretching the stretchable laminate to an elongation rate of 400% at a tensile speed of 1000 mm / min and then returning the elongation to an elongation rate of 0% at a tensile speed of 1000 mm / min, the elongation rate starts from 0%. Having an upper yield point while extending to 100%, and having a lower yield point while extending from the upper yield point to an extension rate of 400%,
The difference between the yield stress at the upper yield point and the yield stress at the lower yield point is 0.05 N / 30 mm width or more.

In a preferred embodiment, the elastomer layer has the olefin resin layer on both sides.

In a preferred embodiment, the olefin resin layer is directly laminated on at least one side of the elastomer layer.

In a preferred embodiment, the stretch laminate of the present invention has a thickness of 10 μm to 500 μm.

In a preferred embodiment, the olefin resin layer contains a non-elastomeric olefin resin.

In a preferred embodiment, the content ratio of the non-elastomeric olefin resin in the olefin resin layer is 50% by weight to 100% by weight.

In a preferred embodiment, the content ratio of the non-elastomeric olefin resin in the olefin resin layer is 95% by weight to 100% by weight.

In a preferred embodiment, the non-elastomeric olefin resin contains an α-olefin homopolymer.

In a preferred embodiment, the α-olefin homopolymer is at least one selected from polyethylene and homopolypropylene.

In a preferred embodiment, the polyethylene is high density polyethylene.

In a preferred embodiment, the olefin resin layer has a thickness of 2 μm to 50 μm.

In a preferred embodiment, the olefin resin layer has a thickness of 2 μm to 8 μm.

In a preferred embodiment, the elastomer layer contains an olefin elastomer.

In a preferred embodiment, the content of the olefin-based elastomer in the elastomer layer is 50% by weight to 100% by weight.

In a preferred embodiment, the content of the olefin elastomer in the elastomer layer is 95% by weight to 100% by weight.

In a preferred embodiment, the olefin elastomer is an α-olefin elastomer.

In a preferred embodiment, the α-olefin elastomer is at least one selected from ethylene elastomer and propylene elastomer.

In a preferred embodiment, the α-olefin-based elastomer is produced using a metallocene catalyst.

In a preferred embodiment, the elastomer layer has a thickness of 8 μm to 450 μm.

In a preferred embodiment, the elastomer layer has a thickness of 8 μm to 67 μm.

In a preferred embodiment, the stretch laminate of the present invention is used for sanitary goods.

The article of the present invention includes the stretchable laminate of the present invention.

The stretch laminate of the present invention is obtained by pre-stretching the stretch laminate of the present invention.

In a preferred embodiment, the stretchable laminate extension of the present invention is used for hygiene products.

The article of the present invention includes the stretch laminate of the present invention.

According to the present invention, it is possible to provide a stretchable laminate having excellent handling properties and excellent blocking resistance. Moreover, the articles | goods containing such a stretchable laminated body can be provided. Furthermore, the stretchable laminated body obtained by pre-stretching such a stretchable laminate can be provided. Moreover, the articles | goods containing such a stretchable laminated body elongate can be provided.

It is a schematic sectional drawing of the elastic laminated body by preferable embodiment of this invention. FIG. 3 is an SS data diagram of a stretchable laminate according to a preferred embodiment of the present invention. It is a SS data figure at the time of the pre-extension of the elastic laminated body by preferable embodiment of this invention. It is a hysteresis loop figure after the pre-extension of the elastic laminated body by preferable embodiment of this invention.

≪≪Elastic laminate >> ≫
The stretchable laminate of the present invention has an olefin resin layer on at least one side of the elastomer layer. That is, the stretchable laminate of the present invention may have an olefin resin layer only on one side of the elastomer layer, or may have an olefin resin layer on both sides of the elastomer layer. . When the stretchable laminate of the present invention has such a configuration, the stretchable laminate of the present invention can be excellent in handleability and excellent in blocking resistance.

The stretchable laminate of the present invention may contain any other appropriate layer as long as the effects of the present invention are not impaired. Such any other appropriate layer may be only one layer or two or more layers.

In the stretchable laminate of the present invention, the olefin resin layer is preferably laminated directly on the elastomer layer. That is, one of the preferred embodiments of the stretchable laminate of the present invention is a form in which an olefin resin layer is directly laminated on at least one side of the elastomer layer. Thus, when the olefin-based resin layer is directly laminated on the elastomer layer, the stretchable laminate of the present invention can be excellent in handling properties and in blocking resistance.

FIG. 1 is a schematic cross-sectional view of a stretchable laminate according to a preferred embodiment of the present invention. The stretchable laminate 100 shown in FIG. 1 is provided on the opposite side of the elastomer layer 10 and the olefin resin layer 20a provided on one side of the elastomer layer 10 and the olefin resin layer 20a of the elastomer layer 10. And the obtained olefin resin layer 20b. A material for adhering both may exist between the elastomer layer 10 and the olefin resin layer 20a and / or between the elastomer layer 10 and the olefin resin layer 20b. Examples of such a material include an adhesive, a pressure-sensitive adhesive, and a hot melt pressure-sensitive adhesive.

The thickness of the stretchable laminate of the present invention depends on the thickness of the elastomer layer and the thickness of the olefin resin layer, but is preferably 10 μm to 500 μm, more preferably 10 μm to 250 μm, and even more preferably 10 μm. ˜200 μm, particularly preferably 10 μm to 100 μm. By adjusting the thickness of the stretchable laminate of the present invention within such a range, it becomes easy to use as a member used for articles such as sanitary goods such as diapers and masks.

The stretchable laminate of the present invention has an elongation rate of 0 in the SS data diagram of the operation of stretching the elongation rate to 400% at a tensile rate of 1000 mm / min and then returning the elongation to an elongation rate of 0% at a tensile rate of 1000 mm / min. It has an upper yield point while extending from% to 100%, and has a lower yield point while extending from the upper yield point to an elongation rate of 400%. By having such properties, the stretchable laminate of the present invention can be excellent in handleability.

FIG. 2 shows the SS of the stretchable laminate according to the preferred embodiment of the present invention, which is stretched to a stretch rate of 400% at a stretch rate of 1000 mm / min and then returned to a stretch rate of 0% at a stretch rate of 1000 mm / min. A data diagram is shown. As shown in FIG. 2, the stretchable laminate according to the preferred embodiment of the present invention has an upper yield point A while the elongation percentage is elongated from 0% to 100%. Furthermore, as shown in FIG. 2, the stretchable laminate according to the preferred embodiment of the present invention has a lower yield point B while extending from the upper yield point A to an elongation ratio of 400%.

In the elastic laminate of a preferred embodiment of the present invention, the difference between the yield stress at the upper yield point and the yield stress at the lower yield point (in FIG. 2, the yield stress P at the upper yield point A and the yield stress at the lower yield point B). The difference in stress Q) is 0.05 N / 30 mm width or more, preferably 0.05 N / 30 mm width to 10 N / 30 mm width, more preferably 0.05 N / 30 mm width to 5 N / 30 mm width, The width is preferably 0.05 N / 30 mm width to 2 N / 30 mm width, and particularly preferably 0.1 N / 30 mm width to 2 N / 30 mm width. By adjusting the difference between the yield stress at the upper yield point and the yield stress at the lower yield point within the above range, the stretchable laminate of the present invention can be excellent in handleability.

The stretch laminate of the present invention preferably has an excellent error because the olefinic resin layer is plastically deformed or stretched beyond the brittle fracture point of the olefinic resin layer by pre-elongation in this way. Can exhibit stick performance. However, the pre-extension conditions are not limited to the above-described conditions, that is, the operation of extending the elongation rate to 400% at a tensile speed of 1000 mm / min and then returning the elongation to the elongation rate of 0% at a tensile speed of 1000 mm / min. As described above, any appropriate conditions can be adopted as long as the effects of the present invention are not impaired.

Thus, the stretch laminate of the present invention is preferably less elastic due to the presence of the olefin-based resin layer before being pre-stretched, and therefore has good handleability, After pre-stretching, excellent elastic performance can be developed.

The presence of the olefin-based resin layer creates an upper yield point, and the upper yield point is a manifestation of resistance stress until the elastic performance is exhibited by elongation. A laminate having an upper yield point is less likely to exhibit elastic properties, and therefore has better handleability.

The presence of the lower yield point is a manifestation of the disappearance of the above-mentioned resistance stress, and the elongation after the lower yield point is extended beyond the brittle fracture point of the olefin resin layer or plastic deformation of the olefin resin layer. In other words, it is a manifestation that excellent elastic performance can be expressed.

) The greater the difference between the yield stress at the upper yield point and the yield stress at the lower yield point, the less likely the elastic properties are to be expressed, and therefore the handling properties can be improved.

≪Elastomer layer≫
Any appropriate number of elastomer layers may be adopted. The number of such elastomer layers is preferably 1 to 5 layers, more preferably 1 to 3 layers, still more preferably 1 to 2 layers, and particularly preferably 1 layer.

When the number of elastomer layers is plural, each of these layers may be the same type of layer, or at least two layers may be different types of layers.

The elastomer layer may contain any appropriate resin as long as the effects of the present invention are not impaired. Examples of such resins include olefin elastomers and styrene elastomers. Preferably, the elastomer layer includes an olefin-based elastomer. When the elastomer layer contains an olefin-based elastomer, the stretchable laminate of the present invention can be more excellent in handleability.

Only one type of olefin-based elastomer may be used, or a blend of two or more types may be used.

When the elastomer layer contains an olefin-based elastomer, the thermal stability can be improved, and for example, thermal degradation during the production of the stretchable laminate of the present invention can be suppressed. Moreover, when an elastomer layer contains an olefin-type elastomer, storage stability improves and the fluctuation | variation of the physical-property value can be suppressed during the preservation | save of the stretchable laminated body of this invention.

In addition, when the elastomer layer contains an olefin-based elastomer, the process for producing the elastomer layer can be simplified and the processing cost can be suppressed. This is because when an olefin-based elastomer is employed, it is possible to perform extrusion molding by reducing the types of resins used in the production of the elastomer layer, and it may not be necessary to prepare a masterbatch.

The content of the olefin-based elastomer in the elastomer layer is preferably 50% by weight to 100% by weight, more preferably 70% by weight to 100% by weight, and still more preferably, from the viewpoint that the effects of the present invention are more manifested. Is 80% to 100% by weight, particularly preferably 90% to 100% by weight, and most preferably 95% to 100% by weight. By adjusting the content ratio of the olefinic elastomer in the elastomer layer within the above range, the stretchable laminate of the present invention can be further improved in handleability.

Examples of olefin elastomers include olefin block copolymers, olefin random copolymers, ethylene copolymers, propylene copolymers, ethylene olefin block copolymers, propylene olefin block copolymers, ethylene olefin random copolymers, propylene olefin random copolymers, ethylene propylene random copolymers, ethylene (1 -Butene) random copolymer, ethylene (1-pentene) olefin block copolymer, ethylene (1-hexene) random copolymer, ethylene (1-heptene) olefin block copolymer, ethylene (1-octene) olefin block copolymer, ethylene (1-nonene) ) Olefin block copolymer, ethylene (1-decene) ole Fin block copolymers, propylene-ethylene-olefin block copolymers, ethylene (alpha-olefin) copolymers, ethylene (alpha-olefin) random copolymer, ethylene (alpha-olefin) block copolymers or combinations thereof, and the like.

The olefin-based elastomer, its density, preferably ^{0.890g / cm 3 ~ 0.830g / cm} 3, more preferably ^{0.888g / cm 3 ~ 0.835g / cm} 3, more preferably 0.886 g / cm ³ to 0.835 g / cm ³ , particularly preferably 0.885 g / cm ³ to 0.840 g / cm ³ , and most preferably 0.885 g / cm ³ to 0.845 g / cm ^3. ³ . By including an olefin elastomer having a density falling within the above range in the elastomer layer, the stretchable laminate of the present invention can be further improved in handleability.

As the olefin elastomer, the MFR at 2.16 kgf at 230 ° C. is preferably 1.0 g / 10 min to 25.0 g / 10 min, more preferably 2.0 g / 10 min to 23.0 g / 10. Min, more preferably 2.0 g / 10 min to 21.0 g / 10 min, particularly preferably 2.0 g / 10 min to 20.0 g / 10 min, most preferably 2.0 g / 10 min. Min to 19.0 g / 10 min. By including an olefin elastomer in which the MFR falls within the above range in the elastomer layer, the stretchable laminate of the present invention can be further improved in handleability.

Specifically, the olefin elastomer is preferably an α-olefin elastomer. That is, it is a copolymer of two or more α-olefins and has elastomeric properties. Among such α-olefin elastomers, more preferably selected from ethylene elastomers, propylene elastomers, and 1-butene elastomers. By employing such an α-olefin-based elastomer as the olefin-based elastomer, the stretchable laminate of the present invention can be further improved in handleability.

Among the α-olefin elastomers, ethylene elastomers and propylene elastomers are particularly preferable. By adopting an ethylene-based elastomer or a propylene-based elastomer as an olefin-based elastomer, the stretchable laminate of the present invention can be further improved in handleability.

The α-olefin elastomer can be obtained as a commercial product. Examples of such commercially available products include some of “Tuffmer” (registered trademark) series manufactured by Mitsui Chemicals, Inc. (for example, Tuffmer PN-3560, etc.), “Vistamaxx” manufactured by ExxonMobil, Inc. "(Registered trademark) series (for example, Vistamax 6202, Vistamax 7010, etc.).

The α-olefin elastomer is preferably produced using a metallocene catalyst. By employing an α-olefin-based elastomer produced using a metallocene catalyst, the stretchable laminate of the present invention can be further improved in handleability.

The elastomer layer may contain any appropriate other component as long as the effects of the present invention are not impaired. Examples of such other components include other polymers, tackifiers, plasticizers, deterioration inhibitors, pigments, dyes, antioxidants, antistatic agents, lubricants, foaming agents, heat stabilizers, and light stabilizers. An agent, an inorganic filler, an organic filler, etc. are mentioned. These may be only one type or two or more types. The content of other components in the elastomer layer is preferably 10% by weight or less, more preferably 7% by weight or less, still more preferably 5% by weight or less, and particularly preferably 2% by weight or less. Most preferably, it is 1% by weight or less.

The thickness of the elastomer layer is preferably 8 μm to 450 μm, more preferably 8 μm to 220 μm, still more preferably 8 μm to 180 μm, particularly preferably 8 μm to 90 μm, and most preferably 8 μm to 67 μm. By adjusting the thickness of the elastomer layer within such a range, it is possible to provide a stretchable laminate having better fit.

≪Olefin resin layer≫
Any appropriate number can be adopted as the number of olefin-based resin layers. The number of such olefin-based resin layers is preferably 1 to 5 layers, more preferably 1 to 3 layers, still more preferably 1 to 2 layers, and particularly preferably 2 layers ( For example, one layer on each side of the elastomer layer).

When there are a plurality of olefin-based resin layers, all of these layers may be the same type of layers, or at least two layers may be different types of layers.

The olefin-based resin layer may contain any appropriate resin as long as the effects of the present invention are not impaired. The olefin resin layer preferably contains a non-elastomeric olefin resin. A non-elastomeric olefin resin means an olefin resin that is not an elastomeric olefin resin. When the olefin-based resin layer contains a non-elastomeric olefin-based resin, the stretchable laminate of the present invention can be excellent in handling properties and can be excellent in blocking resistance.

The non-elastomeric olefin resin may be only one kind, or may be a blend or copolymer of two or more kinds.

The content ratio of the non-elastomeric olefin resin in the olefin resin layer is preferably 50% by weight to 100% by weight, more preferably 70% by weight to 100% by weight, from the viewpoint that the effect of the present invention is more manifested. More preferably, it is 80% by weight to 100% by weight, particularly preferably 90% by weight to 100% by weight, and most preferably 95% by weight to 100% by weight. By adjusting the content ratio of the non-elastomeric olefin resin in the olefin resin layer within the above range, the stretchable laminate of the present invention can be more excellent in handling properties and can be further improved in blocking resistance.

Examples of non-elastomeric olefin resins include α-olefin homopolymers, copolymers of two or more α-olefins, block polypropylene, random polypropylene, one or more α-olefins and other vinyls. Examples thereof include a monomer copolymer. Examples of the copolymerization form in the copolymer include a block form and a random form.

Examples of α-olefins include α-olefins having 2 to 12 carbon atoms. Examples of such α-olefins include ethylene, propylene, 1-butene and 4-methyl-1-pentene.

Examples of the α-olefin homopolymer include polyethylene (PE), homopolypropylene (PP), poly (1-butene), poly (4-methyl-1-pentene), and the like.

Examples of polyethylene (PE) include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE).

The structure of homopolypropylene (PP) may be any of isotactic, atactic and syndiotactic.

The non-elastomeric olefin-based resin preferably includes an α-olefin homopolymer, more preferably at least selected from polyethylene (PE) and homopolypropylene (PP), from the viewpoint that the effects of the present invention can be further expressed. 1 type is included, More preferably, at least 1 type chosen from a high density polyethylene (HDPE) and a homo polypropylene (PP) is included. When the non-elastomeric olefin-based resin contains at least one selected from high-density polyethylene (HDPE) and homopolypropylene (PP), a stretch laminate that is more excellent in handleability can be provided. The content ratio of the homopolymer of α-olefin in the non-elastomeric olefin resin is preferably 50% by weight to 100% by weight, more preferably 70% by weight or more, from the viewpoint that the effect of the present invention can be expressed more. 100 wt%, more preferably 80 wt% to 100 wt%, even more preferably 90 wt% to 100 wt%, particularly preferably 95 wt% to 100 wt%, most preferably substantially 100% by weight.

Examples of the copolymer of two or more kinds of α-olefins include, for example, an ethylene / propylene copolymer, an ethylene / 1-butene copolymer, an ethylene / propylene / 1-butene copolymer, an ethylene / carbon number of 5 to 12 α-olefin copolymers, propylene / α-olefin copolymers having 5 to 12 carbon atoms, and the like.

Examples of the copolymer of one or more α-olefins and other vinyl monomers include, for example, ethylene / vinyl acetate copolymer, ethylene / acrylic acid alkyl ester copolymer, ethylene / methacrylic acid alkyl ester copolymer And an ethylene-nonconjugated diene copolymer.

A commercially available non-elastomeric olefin resin may be used.

The olefin-based resin layer may contain any appropriate other component as long as the effects of the present invention are not impaired. Examples of such other components include mold release agents, ultraviolet absorbers, heat stabilizers, fillers, lubricants, colorants (dyes, etc.), antioxidants, anti-smudge agents, anti-blocking agents, and foams. Agents, polyethyleneimine and the like. These may be only one type or two or more types. The content of other components in the olefin resin layer is preferably 10% by weight or less, more preferably 7% by weight or less, still more preferably 5% by weight or less, and particularly preferably 2% by weight or less. And most preferably 1% by weight or less.

Examples of the release agent include fatty acid amide release agents, silicone release agents, fluorine release agents, and long-chain alkyl release agents. From the viewpoint that an excellent release layer can be formed due to a balance between releasability and contamination due to bleed-out, a fatty acid amide release agent is preferable, and a saturated fatty acid bisamide is more preferable. Arbitrary appropriate content can be employ | adopted for content of a mold release agent. Typically, it is preferably 0.01% by weight to 5% by weight with respect to the resin component in the olefin resin layer (preferably a non-elastomeric olefin resin).

Examples of the ultraviolet absorber include benzotriazole compounds, benzophenone compounds, benzoate compounds, and the like. Any appropriate content can be adopted as the content of the ultraviolet absorber as long as it does not bleed out during molding. Typically, it is preferably 0.01% by weight to 5% by weight with respect to the resin component in the olefin resin layer (preferably a non-elastomeric olefin resin).

Examples of the heat stabilizer include hindered amine compounds, phosphorus compounds, and cyanoacrylate compounds. Any appropriate content can be adopted as the content of the heat-resistant stabilizer as long as it does not bleed out during molding. Typically, it is preferably 0.01% by weight to 5% by weight with respect to the resin component in the olefin resin layer (preferably a non-elastomeric olefin resin).

Examples of the filler include inorganic fillers such as talc, titanium oxide, calcium oxide, magnesium oxide, zinc oxide, titanium oxide, calcium carbonate, silica, clay, mica, barium sulfate, whisker, and magnesium hydroxide. The average particle diameter of the filler is preferably 0.1 μm to 20 μm. Arbitrary appropriate content can be employ | adopted for content of a filler. Typically, the amount is preferably 1% by weight to 200% by weight with respect to the resin component (preferably non-elastomeric olefin resin) in the olefin resin layer.

The thickness of the olefin resin layer is preferably 2 μm to 50 μm, more preferably 2 μm to 30 μm, still more preferably 2 μm to 20 μm, particularly preferably 2 μm to 10 μm, and most preferably 2 μm to 8 μm. is there. By adjusting the thickness of the olefin-based resin layer within such a range, it becomes easy to use as a member used for articles such as sanitary goods such as diapers and masks.

<< Manufacture of stretchable laminate >>
As a method for producing the stretchable laminate of the present invention, any method can be used as long as the structure having an olefin-based resin layer on at least one side of the elastomer layer can be constructed without impairing the effects of the present invention. Any suitable method can be employed.

As a method for producing the stretchable laminate of the present invention, a method of producing a laminate by using a multilayer extrusion T-die molding machine is typically mentioned. For example, in the case of producing a stretchable laminate comprising a laminate structure of an olefin resin layer / elastomer layer / olefin resin layer, a molding material / elastomer layer of the olefin resin layer using a three-layer extrusion T-die molding machine The roll material of the stretchable laminate can be manufactured by co-extrusion of the molding material / the molding material of the olefin resin layer from the T-die and integrating them, and then winding up into a roll shape. In addition to the T-die method using a T-die, an inflation method or the like can be employed.

≪Blocking resistance of the stretch laminate of the present invention≫
The stretchable laminate of the present invention has an olefin resin layer on at least one side of the elastomer layer. By having such an olefin resin layer, the stretchable laminate of the present invention can preferably exhibit excellent anti-blocking performance. In particular, when the stretchable laminate of the present invention has an olefin-based resin layer on both sides of the elastomer layer, it can exhibit very excellent blocking resistance.

Stretch laminates that do not have an olefin-based resin layer as the outermost layer, in particular, stretch laminates that have an elastomer layer in both outermost layers, when made into a roll body, the elastomer layers easily block, Rewinding tends to be difficult. Since the stretchable laminate of the present invention has an olefin resin layer on at least one side of the elastomer layer, blocking can be suppressed and rewinding can be easily performed when a roll body is used.

The stretchable laminate of the present invention can exhibit better blocking resistance by including the filler as described above in the olefin resin layer. However, the stretchable laminate of the present invention can exhibit excellent anti-blocking performance even when the olefin resin layer does not contain the filler as described above.

≪Elastic laminate extension product≫
The stretchable laminate extension product of the present invention can exhibit excellent elastic performance.

The stretch laminate of the present invention is obtained by pre-stretching the stretch laminate of the present invention. In addition, this pre-extension is again extended when the stretch laminate of the present invention is pre-stretched to obtain a stretch laminate laminate (for example, when manufacturing a diaper and when using a diaper). Pre-extension in the sense that In addition, the pre-extension conditions (stretching direction, stretching speed, stretching ratio, etc.) are any appropriate conditions as long as the stretchable laminate of the present invention can exhibit stretchability after pre-stretching. Can be adopted.

The pre-extension is preferably performed after the elastic laminate of the present invention is produced and sufficiently solidified.

The pre-extension may be performed on the entire length or width in at least one direction, or may be performed partially. The pre-extension can be performed in any direction. Pre-stretching is preferably performed on its original length or width in at least one direction.

The degree of extension in the pre-extension is preferably 50% or more and less than 150% (typically 100%), more preferably 150% or more and less than 250% (typically 200%), and further preferably 250% or more and 350%. Less (typically 300%), particularly preferably 350% or more and less than 450% (typically 400%). In addition, for example, 100% pre-extension means to extend twice. By pre-extension at such an extension degree, the stretchable laminate extension of the present invention can express more excellent elastic performance.

The pre-elongation is preferably performed at a temperature below the melting point of either the elastomer layer or the olefin resin layer. By pre-stretching at such a temperature, the stretchable laminate stretch product of the present invention can exhibit more excellent elastic performance.

The stretchable laminate of the present invention is preferably preliminarily stretched in this way, so that the olefin resin layer is plastically deformed or stretched beyond the brittle fracture point of the olefin resin layer. It becomes a stretchable laminate and can exhibit excellent elastic performance. That is, the stretchable laminate of the present invention is preferably less elastic due to the presence of the olefin-based resin layer before being pre-stretched, and therefore has good handleability, while pre-stretching. After the treatment, the stretchable laminate of the present invention is obtained, and excellent elastic performance can be exhibited.

<< Low gloss performance of stretch laminate of the present invention >>
Preferably, the stretch laminate of the present invention is preferably stretched in advance so that the olefin resin layer is plastically deformed or stretched beyond the brittle fracture point of the olefin resin layer. It becomes a body extension product. The glossiness of the olefin resin layer that has been plastically deformed or stretched beyond the brittle fracture point can be preferably reduced. In articles such as sanitary goods such as diapers and masks, high-gloss members are misunderstood as being wet and are difficult to adopt. The stretchable laminate of the present invention is preferably used as a member for articles such as diapers and masks, such as sanitary goods, because the glossiness can be reduced by pre-stretching.

≪Use of stretch laminate of the present invention≫
The stretchable laminate of the present invention can be used for any appropriate article that can effectively use the effects of the present invention. That is, the article of the present invention includes the stretchable laminate of the present invention. A typical example of such an article is a sanitary product. As such sanitary goods, for example, the stretchable laminate of the present invention is used as a stretchable member (waistband or gathers) in diapers (particularly the ear (ear) portion, waist or leg opening). Diapers), supporters and masks.

≪Use of stretchable laminate of the present invention≫
The stretchable laminate stretched product of the present invention can be used for any appropriate article that can effectively utilize the effects of the present invention. That is, the article of the present invention includes the stretchable laminate extension of the present invention. A typical example of such an article is a sanitary product. As such sanitary goods, for example, the stretchable laminate extension of the present invention can be used as a stretchable member (waistband or gather) of a diaper (particularly, an ear (ear) portion or an opening portion around a waist or a leg). Used diapers), supporters, masks, etc.

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. In addition, the test and evaluation method in an Example etc. are as follows. Moreover, unless otherwise indicated, a part means a weight part and% means weight%.

<Evaluation of blocking properties>
The elastic laminates or laminate rolls obtained in Examples and Comparative Examples were cut to 30 mm in the width direction and stored for 24 hours in a state of 23 ° C. × 50 RH%, and then the unwinding speed was 300 mm / min. And rewinded. At the time of rewinding, the stretched laminate or the laminate that was broken was marked with ×, and the one that was not broken was marked with ○.

<Elasticity test>
The stretchable laminates or laminates obtained in the examples and comparative examples were cut to 30 mm in the width direction, and set in a tensile tester (manufactured by Shimadzu Corporation: AG-20kNG) with a chuck distance of 40 mm in the longitudinal direction. The film was stretched 100% at a tensile speed of 300 mm / min. After 100% elongation, it was fixed in the stretched state and kept at room temperature for 10 minutes. Ten minutes later, the stretched state is released, and after measuring the initial chuck distance 40 mm (A) and the post-test film length (40 + α) mm (B), [{(B)-(A)} / (A)] The variation rate was measured at × 100. Those with a variation rate exceeding 20% were marked with x, and those with a variation rate of 20% or less were marked with ◯.

<Molding conditions>
In Examples and Comparative Examples, stretchable laminates or laminates were molded using a three-type three-layer (A layer / B layer / C layer) extrusion T-die molding machine. The extrusion temperature was carried out under the following conditions.
A layer: 200 ° C
B layer: 200 ° C
C layer: 200 ° C
Die temperature: 200 ° C
After the T-die was co-extruded and integrated, and the resulting stretchable laminate or laminate was sufficiently solidified, it was rolled into a roll shape.
In the case of pre-stretching, the stretchable laminate or laminate that was drawn out from the roll body was pre-stretched 400% in the width direction.

<SS data measurement method>
The stretchable laminates or laminates obtained in the examples and comparative examples were cut to 30 mm in the width direction, and set in a tensile tester (manufactured by Shimadzu Corporation: AG-20kNG) with a chuck distance of 40 mm in the longitudinal direction. After stretching to 400% at a pulling speed of 1000 mm / min, the stretching was returned to 0% at a pulling speed of 1000 mm / min.
The upper yield point can be confirmed from the measurement of SS data. During the elongation from 0% to 100%, when there is no upper yield point, the elongation stress at 100% strain is the highest, and when it has the upper yield point, the elongation stress at strain less than 100% is the highest. It becomes higher and that point becomes the upper yield point.
The falling yield point can also be confirmed from the measurement of SS data. During the elongation from the upper yield point to 400%, when there is no lower yield point, the elongation stress at 400% strain is the lowest, and when it has the lower yield point, the elongation stress at strain is less than 400%. It becomes the lowest and that point becomes the descending yield point.

<Hysteresis data measurement method>
The stretchable laminates or laminates obtained in the examples and comparative examples were cut to 30 mm in the width direction, and set in a tensile tester (manufactured by Shimadzu Corporation: AG-20kNG) with a chuck distance of 40 mm in the longitudinal direction. After stretching to 100% at a pulling speed of 500 mm / min, the stretching was returned to 0% at a pulling speed of 500 mm / min.

[Example 1]
100 parts by weight of HDPE (trade name: Nipolon Hard 1000) as a non-elastomeric olefin resin is used as the A layer of the extruder and 100 parts by weight of EPR (product name: Vistamax 6202) as an olefin elastomer. Parts into the B layer of the extruder, and 100 parts by weight of HDPE (trade name: Nipolon Hard 1000, manufactured by Tosoh Corporation) as the non-elastomeric olefin resin is put into the C layer of the extruder, and A layer / B layer / C layer = The stretchable laminate (1) having a thickness of 2 μm / 36 μm / 2 μm and a total thickness of 40 μm was extruded.
The results are shown in Table 1.
The obtained stretchable laminate (1) was pre-stretched in the width direction at a magnification of 400%.
The SS data at the time of pre-extension of the stretchable laminate (1) was measured, and it was as shown in FIG. Moreover, when the hysteresis loop after the pre-extension of the stretchable laminate (1) was measured, it was as shown in FIG.

[Example 2]
A stretchable laminate (2) was obtained in the same manner as in Example 1 except that HDPE (manufactured by Basell, trade name: 52518) was used as the non-elastomeric olefin resin.
The results are shown in Table 1.

Example 3
A stretchable laminate (3) was obtained in the same manner as in Example 1 except that PP (manufactured by Nippon Polypro Co., Ltd., trade name: Novatec PP BC03C) was used as the non-elastomeric olefin resin.
The results are shown in Table 1.

Example 4
A blend of 95 parts by weight of EPR (trade name: Vistamax 6202, manufactured by ExxonMobil Corp.) as an olefin elastomer and 5 parts by weight of (titanium oxide, manufactured by Dupont, trade name: Ti-Pure R103) as a white pigment. A stretchable laminate (4) was obtained in the same manner as in Example 1 except that it was added to the B layer.
The results are shown in Table 1.

Example 5
A stretchable laminate (5) was obtained in the same manner as in Example 1 except that the thickness of A layer / B layer / C layer = 4 μm / 64 μm / 4 μm, 72 μm in total.
The results are shown in Table 1.

Example 6
A stretchable laminate (6) was obtained in the same manner as in Example 1 except that A layer / B layer / C layer = 2 μm / 20 μm / 2 μm, and the total thickness was 24 μm.
The results are shown in Table 1.

Example 7
A stretchable laminate (7) was obtained in the same manner as in Example 1 except that A layer / B layer / C layer = 8 μm / 20 μm / 8 μm, and the total thickness was 36 μm.
The results are shown in Table 1.

Example 8
Except for using non-elastomeric olefin resin blended with 80 parts by weight of HDPE (manufactured by Tosoh Corporation, trade name: Nipolon Hard 1000) and 20 parts by weight of PP (trade name: Novatec PP BC03C, made by Nippon Polypro) In the same manner as in Example 1, an elastic laminate (8) was obtained.
The results are shown in Table 1.

Example 9
Example except that 70 parts by weight of EPR (ExxonMobil Corp., trade name: Vistamax 6202) and 30 parts by weight of Tuffmer PN-3560 (Mitsui Chemicals Co., Ltd.) as olefin elastomer were added to the B layer. In the same manner as in Example 1, an elastic laminate (9) was obtained.
The results are shown in Table 1.

Example 10
A stretchable laminate (10) was obtained in the same manner as in Example 1 except that 100 parts by weight of EPR (exxon mobile, trade name: Vistamax 7010) was used as the olefin elastomer.
The results are shown in Table 1.

Example 11
A stretchable laminate (11) was obtained in the same manner as in Example 1 except that nothing was added to the C layer.
The results are shown in Table 1.

Example 12
A stretchable laminate (12) was prepared in the same manner as in Example 1 except that 100 parts by weight of SIS (manufactured by Nippon Zeon Co., Ltd., trade name: QUINTAC 3399) was used as a styrene elastomer instead of the olefin elastomer. Obtained.
The results are shown in Table 1.

Example 13
A stretchable laminate (13) was obtained in the same manner as in Example 1 except that 100 parts by weight of SBS (manufactured by Kraton Polymer, trade name: Kraton D1191): 100 parts by weight was used as the styrene elastomer instead of the olefin elastomer.
The results are shown in Table 1.

[Comparative Example 1]
In all of the A layer, the B layer, and the C layer, a laminate (in the same manner as in Example 1 except that HDPE (trade name: Nipolon Hard 1000): 100 parts by weight was used as a non-elastomeric olefin resin. C1) was obtained.
The results are shown in Table 1.

[Comparative Example 2]
In all of the A layer, the B layer and the C layer, the laminate ( C2) was obtained.
The results are shown in Table 1.

The stretchable laminate of the present invention and the stretched laminate of the present invention can be used for any appropriate article that can effectively use the effects of the present invention. That is, the article of the present invention includes the stretch laminate of the present invention and / or the stretch laminate of the present invention. A typical example of such an article is a sanitary product. As such sanitary goods, for example, the stretchable laminate of the present invention and / or the stretchable member (waistband or gathers) of the diaper (particularly the ear (ear) portion, the waist or the leg) is used. Diapers in which the stretchable laminate of the present invention is used), supporters, masks and the like.

100 Elastic laminate 10 Elastomer layer 20a Olefin resin layer 20
20b Olefin resin layer 20

Claims

An elastic laminate having an olefinic resin layer on at least one side of the elastomer layer,
In the SS data diagram of the operation of stretching the stretchable laminate to an elongation rate of 400% at a tensile speed of 1000 mm / min and then returning the elongation to an elongation rate of 0% at a tensile speed of 1000 mm / min, the elongation rate starts from 0%. Having an upper yield point while extending to 100%, and having a lower yield point while extending from the upper yield point to an extension rate of 400%,
The difference between the yield stress at the upper yield point and the yield stress at the lower yield point is 0.05 N / 30 mm width or more.
Elastic laminate.
The stretchable laminate according to claim 1, comprising the olefin resin layer on both sides of the elastomer layer.
The stretchable laminate according to claim 1, wherein the olefin-based resin layer is directly laminated on at least one side of the elastomer layer.
2. The stretchable laminate according to claim 1, wherein the thickness is 10 μm to 500 μm.
The stretchable laminate according to claim 1, wherein the olefin resin layer contains a non-elastomeric olefin resin.
The stretchable laminate according to claim 5, wherein the content ratio of the non-elastomeric olefin resin in the olefin resin layer is 50 wt% to 100 wt%.
The stretchable laminate according to claim 5, wherein the content of the non-elastomeric olefin resin in the olefin resin layer is 95 wt% to 100 wt%.
6. The stretchable laminate according to claim 5, wherein the non-elastomeric olefin resin contains an α-olefin homopolymer.
The stretchable laminate according to claim 8, wherein the α-olefin homopolymer is at least one selected from polyethylene and homopolypropylene.
The stretchable laminate according to claim 9, wherein the polyethylene is high-density polyethylene.
2. The stretchable laminate according to claim 1, wherein the olefin resin layer has a thickness of 2 μm to 50 μm.
2. The stretchable laminate according to claim 1, wherein the olefin resin layer has a thickness of 2 μm to 8 μm.
The stretchable laminate according to claim 1, wherein the elastomer layer contains an olefin-based elastomer.
The stretchable laminate according to claim 13, wherein the content of the olefinic elastomer in the elastomer layer is 50 wt% to 100 wt%.
The stretchable laminate according to claim 13, wherein the content of the olefinic elastomer in the elastomer layer is 95 wt% to 100 wt%.
The stretchable laminate according to claim 13, wherein the olefin elastomer is an α-olefin elastomer.
The stretchable laminate according to claim 16, wherein the α-olefin elastomer is at least one selected from ethylene elastomer and propylene elastomer.
The stretchable laminate according to claim 16, wherein the α-olefin-based elastomer is produced using a metallocene catalyst.
2. The stretchable laminate according to claim 1, wherein the elastomer layer has a thickness of 8 μm to 450 μm.
2. The stretchable laminate according to claim 1, wherein the elastomer layer has a thickness of 8 μm to 67 μm.
The stretchable laminate according to claim 1, which is used for sanitary products.
An article comprising the stretchable laminate according to claim 1.
A stretchable laminate stretch product obtained by pre-stretching the stretchable laminate according to claim 1.
The stretchable laminate extension product according to claim 23, which is used in sanitary products.
An article comprising the stretchable laminate extension according to claim 23.