JP2018034406A - Film with recess - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film having mechanical properties necessary for using as a film, soft feeling such as cloth, comfortable tactile and natural appearance.SOLUTION: There is provided a film having at least one X surface of which friction coefficient of at least one X surface is 0.35 or less and stiffness is 30 mm or less, when a surface having recesses with depth from a base line of 100 μm to 1,500 μm of 25 to 1,000 per 100 cmis the X surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a film having mechanical properties necessary for use as a film, a soft texture like a cloth, a pleasant tactile sensation, and a natural appearance.

  In recent years, there has been a demand for a single film having a mechanical function necessary for use as a film and further having another function. For example, in the field of medical and hygiene materials, in addition to the mechanical properties necessary for use as a film, a film having a soft texture such as a cloth, a pleasant touch, and a natural appearance is desired.

  Various developments have been made so far to improve the texture of the film. For example, Patent Documents 1 and 2 disclose that a porous film with improved texture can be obtained by mixing a soft resin with a filler and stretching. Patent Documents 3 and 4 disclose that moisture permeability and film feel are improved by forming an uneven pattern by embossing.

Japanese Patent Laid-Open No. 10-237238 JP 2007-238822 A Japanese Examined Patent Publication No. 6-765015 WO2013 / 031755 pamphlet

  However, with the techniques described in Patent Documents 1 and 2, although a film texture improving effect can be obtained to some extent, a soft texture such as a cloth cannot be imparted to the film. Further, in the techniques described in Patent Documents 3 and 4, softness and tactile sensation close to the cloth can be obtained by setting the depth, height, and number of the uneven patterns to values in an appropriate range, but the appearance due to the presence of the uneven patterns. Is very different from cloth. That is, these techniques have the problem that they do not lead to a film having mechanical properties necessary for use as a film, and having a soft texture like cloth, a pleasant tactile sensation, and a natural appearance. .

  It is an object of the present invention to provide a film which improves the disadvantages of the prior art and has excellent mechanical properties necessary for use as a film, and has a soft texture like cloth, a pleasant touch and a natural appearance. And

In order to solve the above problems, the present invention has the following configuration.
(1) When a surface having 25 to 1,000 recesses per 100 cm ² having a depth of 100 μm or more and 1,500 μm or less from the base line is defined as an X surface, the surface has at least one X surface, A film having a coefficient of friction of one X plane of 0.35 or less and a bending resistance of 30 mm or less.
(2) At least one X-plane has a surface roughness variation (SMD) measured according to the KES method of 0.1 μm or more and 1 μm or less, and a friction coefficient variation (MMD) measured according to the KES method. 0.005 or more and 0.07 or less, The film as described in (1) characterized by the above-mentioned.
(3) in at least one of the X plane, contact cold feeling as measured according to KES method (Qmax), characterized in that at 0.02 W / cm ² or more 0.50 W / cm ² or less, (1) Or the film as described in (2).
(4) The film according to any one of (1) to (3), comprising a thermoplastic elastomer.
(5) The film according to any one of (1) to (4), comprising a filler.

  According to the present invention, it is possible to provide a film having mechanical properties necessary for use as a film, a soft texture like a cloth, a pleasant touch feeling, and a natural appearance.

It is an enlarged top view (A) which shows the film which concerns on one embodiment of this invention, and the I-I 'cross section arrow directional view (B) in A. Embossing roll used in the embossing process of the example (a partially enlarged schematic cross-sectional view when cut in a direction perpendicular to the rotation axis, and the hatched portion is the embossing roll) It is an expansion schematic top view which shows the convex part of the embossing roll used by the embossing of an Example. It is a schematic top view showing the cutting direction for cross-sectional observation of a film.

The film of the present invention has at least one X plane when the plane having 25 to 1,000 recesses per 100 cm ² having a depth of 100 μm or more and 1,500 μm or less from the base line is defined as the X plane. The friction coefficient of at least one X surface is 0.35 or less, and the bending resistance is 30 mm or less. Although the desirable form for implementing this invention is demonstrated below, this invention is not limited to this.
(Concave part of film)
It is important that the film of the present invention has at least one surface (X surface) having 25 to 1,000 recesses per 100 cm ² with a depth from the base line of 100 μm to 1,500 μm.

  FIG. 1 shows an enlarged top view (A) showing a film according to an embodiment of the present invention, and an I-I ′ cross-sectional arrow view (B) in A. The baseline is the vertical direction with the largest distribution when the film c1 is placed on a horizontal table and the position data in the direction perpendicular to the horizontal plane is obtained for the entire film surface (surface opposite to the table). The position of For example, in FIG. 1B, the line indicated by c2 is the baseline. When there are multiple positions corresponding to the baseline including the film surface, the film surface is the baseline, and when there are multiple positions corresponding to the baseline without including the film surface, The near line is the baseline.

  The depth of the concave portion refers to a difference in position between the base line and the deepest portion in the concave portion in a direction perpendicular to the film surface (hereinafter also referred to as a thickness direction) (corresponding to c3 in FIG. 1B). The depth of the recess is measured with a microscope using a microscope to measure the cross section obtained by cutting the film parallel to the thickness direction using an ultramicrotome, etc., and using the obtained image. can do.

  Since the film of this invention has a recessed part, compared with the film which does not have a recessed part, the contact area when a film is touched with a finger becomes small, and it has a tactile feeling with little resistance, and high cushioning properties. Furthermore, it has a high designability, unlike a general film visually.

  The depth of the concave portion on the X plane of the film of the present invention is preferably from 300 μm to 1,200 μm, more preferably from 500 μm to 1,000 μm, from the viewpoints of touch, cushioning properties, and design.

Further, the film of the present invention has 25 to 1,000 recesses per 100 cm ² having a depth of 100 μm or more and 1,500 μm or less from the baseline, whereby recesses are formed over the entire film surface. Tactile feel and cushioning are improved. The number of such recesses is preferably 50 or more per 100 cm ² , more preferably 75 or more per 100 cm ² . The upper limit of the number of such recesses, in view of the feel of the film is preferably not more than 500 per 100 cm ^2, more preferably less 300 per 100 cm ^2.

The X plane in the film of the present invention is not particularly limited as long as it is a plane having 25 to 1,000 recesses per 100 cm ² with a depth from the base line of 100 μm to 1,500 μm. The depth of the recess in may be uniform or non-uniform. Moreover, unless the effect of this invention is impaired, you may have a recessed part from which the depth from a convex part or a base line remove | deviates from the said range. Moreover, if the film of this invention has at least 1 X surface, about the other surface, it will not restrict | limit especially unless the effect of this invention is impaired.

The film has at least one surface (X surface) having a total of 25 to 1,000 recesses per 100 cm ² having a height from the baseline of 100 μm to 1,500 μm on at least one surface. Although the method made into an aspect is not restrict | limited especially unless the effect of this invention is impaired, From the viewpoint of the simplicity of a process, it is preferable that it is the embossing by an embossing roll. Below, embossing is demonstrated as an example.

  The embossing used in producing the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired. For example, a method of combining a male embossing roll and an elastic roll such as a rubber roll, or a pair of There is a method of combining a male embossing roll and a female embossing roll. Further, the pattern (pattern) of the embossing roll is not particularly limited as long as the effect of the present invention is not impaired. Circular, square, parallelogram, heart pattern, star pattern, quadrangular pyramid pattern, truncated cone pattern, vertical line pattern , And horizontal line patterns can be used.

(Coefficient of friction)
In the film of the present invention, it is important that the coefficient of friction of the X surface is 0.35 or less from the viewpoint of improving a pleasant tactile sensation when touching the X surface, and 0.05 to 0.35 or less. Preferably there is. Here, the coefficient of friction refers to a coefficient of friction measured according to the KES method. Specifically, a standard friction element (fingerprint type) is attached as a slider under an atmosphere of 23 ° C. and a relative humidity of 65%, and a load of 25 gf. The friction coefficient measured by the KES method when the slider is moved on the surface of the sample at a speed of 1 mm / sec. The KES method is the Kawabata Evaluation System method. Hereinafter, the notation of the method is referred to as the KES method. In the case where there are a plurality of X planes, “the friction coefficient of the X plane is 0.35 or less” means that the friction coefficient of at least one X plane is 0.35 or less. The same applies to fluctuations in surface roughness (SMD) and fluctuations in friction coefficient (MMD), which will be described later.

  From the viewpoint of the feel of the film, the friction coefficient of the X surface is preferably 0.30 or less, and more preferably 0.25 or less. The lower limit of the coefficient of friction on the X surface is not particularly limited as long as the effects of the present invention are not impaired, but it is preferably 0.05 or more, more preferably 0.10 or more from the viewpoint of the handleability of the film. More preferably, it is 0.20 or more.

  The method for setting the friction coefficient of the X surface to 0.35 or less or the above preferable range is not particularly limited as long as the effects of the present invention are not impaired. For example, the types and contents of thermoplastic elastomers and fillers to be described later For example, a method for adjusting the layer structure, and a method for adjusting the depth of the recess. Specifically, the value can be reduced by increasing the content of the filler described later, or by making the surface a hard layer (stiffening) in the laminated configuration described later.

(Flexibility)
From the viewpoint of the softness of the film, it is important that the present invention film has a bending resistance of 30 mm or less. Here, the bending resistance means bending resistance measured in accordance with JIS 1096: 2010 method A (45 ° cantilever method). From the viewpoint of the softness of the film, the bending resistance is more preferably 25 mm or less, and further preferably 20 mm or less. The lower limit of the bending resistance is not particularly limited as long as the effect of the present invention is not impaired, but is preferably 5 mm or more from the viewpoint of the handleability of the film.

  The method for setting the bending resistance of the film to 30 mm or less or the above preferable range is not particularly limited as long as the effects of the present invention are not impaired. For example, the types and contents of thermoplastic elastomers and fillers to be described later are used. Examples thereof include a method for adjusting, a method for adjusting the layer structure, and a method for adjusting the depth of the recess. Specifically, the value can be reduced by reducing the content of the filler described later, or by making the inner surface a soft layer in the laminated configuration described later.

(Shear hardness (G))
The film of the present invention has a shear hardness (G) measured according to the KES method of 1 gf / (cm · deg) or more and 3 gf / (cm · deg) or less from the viewpoint of imparting shear deformability like cloth. Is preferred.

  Shear deformation refers to a deformation pattern that is most easily received by a cloth constituted by warp and weft crossing. The fact that a two-dimensional cloth can easily cover a three-dimensional curved surface greatly depends on this shear deformation, and the larger the shear deformation, that is, the smaller the shear strength (G), the more the curved surface like a human body fits. It is easy to do and a feeling of wear is good. That is, a film having a shear hardness (G) of 1 gf / (cm · deg) or more and 3 gf / (cm · deg) or less is preferable when used for an application that may be worn on a human body such as a sanitary material. It will be a thing.

The shear hardness (G) measured according to the KES method means the shear hardness (G) calculated from the shear stress in the longitudinal direction and the width direction measured according to the KES method. More specifically, the shear stress in the longitudinal direction and the width direction at points where the shear deformation is −2.5 °, −0.5 °, 0.5 °, and 2.5 ° is measured by the KES method. (hereinafter, respectively _HG -2.5 shear stress at each _point, HG _-0.5, HG _0.5, sometimes referred _{HG 2.5),} the longitudinal direction and the width direction, positive using the formula G1 The shear strength in the direction (G (+)) is calculated using the equation G2 to calculate the shear strength in the negative direction (G (−)), and the G (+) and G (−) in the longitudinal direction and the width direction are averaged. This refers to the shear hardness (G) obtained. The conditions at the time of measuring the shear stress are 23 ° C., 65% relative humidity atmosphere, forced load 10 gf, shear shear rate 0.417 mm / sec, and sample shear deformation range −8 ° to 8 °. Hereinafter, the shear hardness (G) measured according to the KES method may be simply referred to as shear hardness (G).

Here, the longitudinal direction refers to the direction in which the film proceeds when producing the film, and the width direction refers to the direction that is parallel to the film transport surface and orthogonal to the longitudinal direction. When the film is wound on a roll, the longitudinal direction and the width direction can be easily specified. However, in the case of a sheet-like film that is not wound on a roll, the longitudinal direction and the width direction Cannot be easily identified. In such a case, after measuring the Young's modulus of the film in one direction arbitrarily selected by the method described later, the film is rotated 5 ° to the right, the same measurement is performed, and this is repeated until 180 ° is reached. The direction with the largest Young's modulus is treated as the longitudinal direction. Hereinafter, the same applies to the present invention.
Formula G1: G (+) = (HG _2.5 −HG _0.5 ) / (2.5 ° −0.5 °)
Formula G2: G (−) = (HG _−2.5 −HG _−0.5 ) / (− 2.5 ° − (− 0.5 °))
From the viewpoint of further improving the shear deformability of the film, the shear hardness (G) is more preferably 1.25 gf / (cm · deg) or more and 2.75 gf / (cm · deg) or less, and 1.5 gf / (Cm · deg) or more 2.5. More preferably, it is gf / (cm · deg) or less.

  The method for setting the shear hardness (G) of the film of the present invention to 1.0 gf / (cm · deg) or more and 3.0 f / (cm · deg) or less, or the preferable range described above, impairs the effects of the present invention. The method is not particularly limited as long as it is not limited, and examples thereof include a method of adjusting the type and content of a thermoplastic elastomer and a filler, which will be described later, a method of adjusting the layer configuration, and a method of adjusting the depth of the recess. More specifically, the shear hardness (G) can be reduced by increasing the depth of the recess.

(Compression work)
The film of the present invention has a cushioning property like cloth and has a pleasant touch. The cushioning property herein is an index representing bulkiness and flexibility, and can be expressed as a measure of a work amount (compression work amount) when the film is compressed.

The compression work can be measured according to the KES method. Specifically, the film is compressed between steel plates having a circular plane with an area of 2 cm ² under conditions of a compression speed of 20 μm / sec, a maximum compression load of 10 gf / cm ² , a room temperature of 23 ° C., and a relative humidity of 65%. It can be measured by the method. Hereinafter, the compression work measured according to the KES method is simply referred to as compression work.

The film of the present invention has a work of compression of 0.02 gf · from the viewpoint of achieving both rollability as a film, handleability, suitability for post-processing, and imparting cushioning properties such as cloth and a pleasant tactile feel to the film. It is preferable that it is cm / cm ² or more and 0.5 gf · cm / cm ² or less. If the compression work is less than 0.02 gf · cm / cm ² , the cushioning properties and tactile sensation of the film may be lowered. On the other hand, if it exceeds 0.5 gf · cm / cm ² , the cushioning property of the film is excellent, but the film becomes too bulky, so that it can be rolled up and handled, and post-processed such as printing and laminating. The post-processing aptitude etc. at the time of application may fall.

Compression work amount from the point of view, more preferably 0.03gf · cm / cm ² or more 0.40gf · cm / cm ² or less, 0.04gf · cm / cm ² or more 0.30gf · cm / cm ² More preferably, it is as follows.

The method for setting the compression work of the film of the present invention to 0.02 gf · cm / cm ² or more and 0.5 gf · cm / cm ² or less or the above preferable range is not particularly limited as long as the effect of the present invention is not impaired. However, examples thereof include a method for adjusting the type and content of a thermoplastic elastomer and a filler, which will be described later, a method for adjusting the layer structure, and a method for adjusting the depth of the recess. Specifically, the work of compression can be increased by increasing the depth of the recesses described below.

(Surface roughness variation (SMD) and friction coefficient variation (MMD))
The film of the present invention has a surface roughness variation (SMD) measured according to the KES method on at least one X plane from the viewpoint of giving a pleasant touch to the film and from the viewpoint of productivity. It is preferable that the coefficient of friction (MMD) measured by the KES method is 0.005 or more and 0.07 or less. By adopting such a mode, moderate friction is generated when touching the film, so that not only the feel of the film is comfortable like a cloth, but also the film manufacturing process, particularly the film in the winding process Sliding can be reduced.

  Specifically, the surface roughness variation (SMD) measured according to the KES method is as follows: in an atmosphere of 23 ° C. and a relative humidity of 65%, the load is 5 gf and the moving speed of the slider is 1 mm / sec. This refers to the variation in surface roughness (SMD) measured by the method. Hereinafter, the surface roughness variation (SMD) measured according to the KES method may be simply referred to as the surface roughness variation (SMD).

  From the viewpoint of imparting a pleasant tactile sensation to the film and from the viewpoint of productivity, the surface roughness variation (SMD) is more preferably 0.2 μm or more and 0.9 μm or less on at least one X plane, and 0.3 μm. More preferably, it is 0.8 μm or less.

  In the X plane of the film of the present invention, the method for changing the surface roughness (SMD) to 0.1 μm or more and 1.0 μm or less, or the above preferable range is not particularly limited as long as the effect of the present invention is not impaired. However, examples thereof include a method for adjusting the type and content of a thermoplastic elastomer and a filler, which will be described later, a method for adjusting the layer structure, and a method for adjusting the height of the recess. Specifically, the value can be increased by increasing the content of a filler described later and increasing the depth of the recess.

  Fluctuation coefficient variation (MMD) measured according to the KES method is specifically determined by the KES method in an atmosphere of 23 ° C. and relative humidity of 65% with a load of 25 gf and a slider moving speed of 1 mm / sec. Fluctuation coefficient variation (MMD) to be measured. In the following, the coefficient of friction variation (MMD) measured according to the KES method may be simply referred to as the coefficient of friction variation (MMD).

  From the viewpoint of imparting a pleasant tactile sensation to the film and from the viewpoint of productivity, it is more preferable that the coefficient of friction variation (MMD) is 0.005 or more and 0.06 or less on at least one X plane, and 0.005 or more. More preferably, it is 0.05 or less.

  In the X plane of the film of the present invention, the method for adjusting the coefficient of friction (MMD) to 0.005 or more and 0.07 or less or the above preferable range is not particularly limited as long as the effect of the present invention is not impaired, Examples thereof include a method for adjusting the type and content of a thermoplastic elastomer and a filler, a method for adjusting the layer structure, and a method for adjusting the depth of the recess. Specifically, the value can be reduced by increasing the content of the filler.

  In addition, as long as the film of this invention has at least one X surface, unless the effect of this invention is impaired, about the other surface, it does not restrict | limit.

(Contact cold / warm feeling (Qmax))
Film of the present invention, from the viewpoint of imparting a pleasant feel to the film, the contact cold feeling as measured according to KES method (Qmax) is preferably at 0.02 W / cm ² or more 0.50 W / cm ² or less .

The feeling of contact coldness measured according to the KES method is generally an index for evaluating whether the user feels cold or warm when touching an object. The value of the feeling of coldness (Qmax) measured according to the KES method is larger when the object feels cold when touching an object, and becomes smaller when the object feels warmer. Hereinafter, the contact cold / warm feeling (Qmax) measured according to the KES method may be simply referred to as the contact cold / warm feeling (Qmax). Since the contact cold / hot feeling (Qmax) is 0.50 W / cm ² or less, the skin feels warm when it touches the film, so the film may touch human skin such as hygiene materials. It can be preferably used for a certain application. From the viewpoint of application to sanitary materials, it is sufficient that the lower limit of the contact cold / warm feeling (Qmax) is about 0.02 W / cm ² .

From the viewpoint of comfort improves more the better feel of the film, the contact cold feeling (Qmax) is more preferably 0.03 W / cm ² or more 0.40 W / cm ² or less, 0.04 W / cm ² or more 0.30W / Cm ² or less is more preferable.

The method for contacting cold feeling of the film of the present invention (Qmax) 0.02W / cm ² or more 0.50 W / cm ² or less, or that the above preferred ranges is not particularly limited as long as it does not impair the effects of the present invention However, for example, a method of adjusting the kind and content of a thermoplastic elastomer or a filler, a method of adjusting a layer configuration, a method of adjusting the depth of a recess, and the like can be mentioned. Specifically, the feeling of cold contact temperature (Qmax) can be reduced by increasing the depth of the recess.

(Water permeability of film)
When the film of the present invention is used for applications requiring moisture permeability such as sanitary materials, the moisture permeability is preferably 1,000 g / (m ² · day) or more, and 1,500 g / (m ² · Day) or more, more preferably 2,000 g / (m ² · day) or more. The higher the moisture permeability of the film, the better, but there is no particular upper limit. However, from the viewpoint of application to sanitary materials, 8,000 g / (m ² · day) is sufficient.

  Here, the moisture permeability of the film refers to a moisture permeability obtained by measurement by a method defined in JIS Z0208 (1976) with a constant temperature and humidity device set at 25 ° C. and a relative humidity of 90%.

  The method for adjusting the moisture permeability of the film of the present invention to the above preferable range is not particularly limited as long as the effects of the present invention are not impaired. For example, the type and content of a thermoplastic elastomer and a filler described later are adjusted. For example, a method for adjusting the layer structure, and a method for adjusting the depth of the recess. Specifically, using a highly moisture-permeable thermoplastic elastomer having crystallinity, combining a moisture-permeable material such as polyoxyethylene, or reducing the content of the filler described later, By increasing the depth of the recess, the moisture permeability of the film can be increased.

(Thermoplastic elastomer)
The film of the present invention preferably contains a thermoplastic elastomer from the viewpoint of imparting post-processability such as embossing to the film in addition to flexibility, stretchability and shear deformability. Here, the thermoplastic elastomer refers to a high molecular weight body having rubber elasticity at 25 ° C. By using a thermoplastic elastomer having excellent flexibility among high molecular weight polymers having thermoplasticity, post-processing such as embossing becomes easy.

  The thermoplastic elastomer may be either a crystalline thermoplastic elastomer or an amorphous thermoplastic elastomer, or both may be mixed as long as the effects of the present invention are not impaired. Here, the thermoplastic elastomer having crystallinity is a crystal melting peak when heated in a hot air oven at 100 ° C. for 24 hours and then heated from 25 ° C. to 250 ° C. at a heating rate of 20 ° C./min. Refers to a thermoplastic elastomer in which is observed. On the other hand, an amorphous thermoplastic elastomer has a crystal melting peak when heated from 25 ° C. to 250 ° C. at a heating rate of 20 ° C./min after being heated in a hot air oven at 100 ° C. for 24 hours. It refers to a thermoplastic elastomer that is not observed.

  When an elastomer having crystallinity is used, when the crystalline unit in the thermoplastic elastomer is softened and deformed under a heating condition that causes deformation, the structure after deformation can be easily fixed. Become. The thermoplastic elastomer having crystallinity in the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired. For example, polyester elastomer, polystyrene elastomer, polyolefin elastomer, polyurethane elastomer, and polyamide elastomer Etc. can be used alone or in combination. Among them, from the viewpoints of imparting flexibility, stretchability, shear deformability, etc. to the film, film forming stability, embossing workability, heat resistance, etc., the polyester-based elastomer and the polyamide-based elastomer are used alone or in combination of two or more. Are preferably used in combination.

  Examples of the polyester-based elastomer that can be used for the film of the present invention include a block copolymer of an aromatic polyester and an aliphatic polyester, a block copolymer of an aromatic polyester and an aliphatic polyether, and the like. However, from the viewpoint of imparting moisture permeability, it is preferable to use a block copolymer of an aromatic polyester and an aliphatic polyether.

  Examples of the polyester elastomer that can exhibit high moisture permeability when formed into a film include “Hytrel” (registered trademark) G3548, HTR 8206 grade, and the like manufactured by Toray DuPont.

  Examples of the polyamide-based elastomer that can be used in the film of the present invention include a block copolymer of an aliphatic polyamide and an aliphatic polyester, and a block copolymer of an aliphatic polyamide and an aliphatic polyether. However, from the viewpoint of imparting moisture permeability, it is preferable to use a block copolymer of an aliphatic polyamide and an aliphatic polyether.

  Examples of the polyamide-based elastomer that can exhibit high moisture permeability when used as a film include “PEBAX” (registered trademark) MV1074, MV1041, MV3000, and MH1657 grades manufactured by Arkema.

  The content of the thermoplastic elastomer having crystallinity in the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired. From the viewpoint of further improvement in film formation stability and embossability, the film of the present invention. When the entire resin is 100% by mass, it is preferably 10% by mass or more and 90% by mass or less, more preferably 25% by mass or more and 80% by mass or less, and 45% by mass or more and 75% by mass or less. More preferably. In addition, when there are multiple types of thermoplastic elastomers having crystallinity in the film, the content of the thermoplastic elastomer having crystallinity is calculated by adding up all the thermoplastic elastomers having crystallinity. .

  Examples of the amorphous thermoplastic elastomer that can be used in the present invention include polyurethane-based elastomers, styrene-based elastomers, acrylic-based elastomers, etc. Among them, the effect of improving flexibility and shear deformability is particularly high. From the viewpoint, it is preferable to use an amorphous polyurethane-based elastomer.

  Examples of the amorphous polyurethane-based elastomer that can be used in the film of the present invention include a block copolymer of a hard segment phase composed of a short-chain glycol and diisocyanate and a soft segment phase composed of a polyether, Examples thereof include a block copolymer of a phase and a soft segment phase made of polyester. From the viewpoint of imparting moisture permeability, a block copolymer having a soft segment phase made of polyether is preferable.

  Examples of the amorphous polyurethane-based elastomer that can impart high moisture permeability when formed into a film include “Elastollan” (registered trademark) OP85A10 grade and ET885FG grade manufactured by BASF Japan.

  The content of the amorphous thermoplastic elastomer in the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired, but flexibility, stretchability, shear deformability, moisture permeability, film formation stability, and From the viewpoint of further improving the embossability, when the entire resin in the film of the present invention is 100% by mass, it is preferably 5% by mass or more and 50% by mass or less, and preferably 10% by mass or more and 45% by mass or less. More preferably, it is more preferably 15% by mass or more and 40% by mass or less. In addition, when there are multiple types of amorphous thermoplastic elastomers in the film, the content of the amorphous thermoplastic elastomer shall be calculated by adding up all the amorphous thermoplastic elastomers. .

(filler)
The film of the present invention preferably contains a filler from the viewpoint of adjusting film-forming stability, handling properties, winding property, and surface roughness variation (SMD) and friction coefficient variation (MMD). The filler refers to a substance added for improving various properties, or an inert substance added for the purpose of increasing the amount, increasing the volume, or reducing the cost of the product.

  The filler is not particularly limited as long as the effects of the present invention are not impaired, and an inorganic filler and / or an organic filler can be used. Further, the filler may be one kind or a mixture of plural kinds. However, from the viewpoint of adjusting the variation of surface roughness (SMD) and the variation of friction coefficient (MMD), the filler is preferably an inorganic filler, and carbonates such as calcium carbonate, barium carbonate, and magnesium carbonate, sulfuric acid At least one of complex oxides such as sulfates such as barium and calcium sulfate, metal oxides such as silicon oxide (silica), titanium oxide and zinc oxide, aluminosilicate, mica, talc, kaolin, clay and montmorillonite It is preferable to use calcium carbonate from the viewpoint of versatility and cost.

  The content of the filler in the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired, but from the viewpoint of further improvement of film formation stability, handling properties, winding properties and touch feeling, When the total resin in the film is 100 parts by mass, it is preferably 5 parts by mass or more and 200 parts by mass or less, more preferably 15 parts by mass or more and 70 parts by mass or less, and 25 parts by mass or more and 50 parts by mass or less. It is particularly preferred that When there are a plurality of fillers in the film, the filler content is calculated by adding all the fillers.

(Layer structure)
As long as the effects of the present invention are not impaired, the film of the present invention may have a single layer structure or a laminated structure. However, while maintaining flexibility, stretchability, shear deformability, and moisture permeability, embossability and cloth From the viewpoint of improving a pleasant feeling of touch, it has two layers (A layer and B layer) containing a thermoplastic elastomer having crystallinity, and the content of the filler in the A layer is the content of the filler in the B layer. Is preferably larger.

  Here, the content of the filler in the A layer is larger than the content of the filler in the B layer is the content of the filler in the A layer when the entire resin constituting the A layer is 100 parts by mass ( (Part by mass) is larger than the content (parts by mass) of the filler in the B layer when the entire resin constituting the B layer is 100 parts by mass. By setting it as such a layer structure, embossing property and comfortable tactile sensations like cloth can be improved while maintaining flexibility, stretchability, shear deformability, and moisture permeability. The layer B may be a layer that does not contain a filler.

  The content of the filler in the layer A is not particularly limited as long as the effects of the present invention are not impaired, but the embossability, cloth, etc. are maintained while maintaining flexibility, stretchability, shear deformation properties, and moisture permeability. From the viewpoint of further improving the pleasant touch, when the total resin constituting the A layer is 100 parts by mass, it is preferably 15 parts by mass or more and 90 parts by mass or less, and 17 parts by mass or more and 70 parts by mass or less. More preferably, it is more preferably 20 parts by mass or more and 50 parts by mass or less.

  The content of the filler in the B layer is not particularly limited as long as the effect of the present invention is not impaired, but embossability, cloth, etc. are maintained while maintaining flexibility, stretchability, shear deformability, and moisture permeability. From the viewpoint of further improving the pleasant touch, when the total resin constituting the B layer is 100 parts by mass, it is preferably 3 parts by mass or more and 45 parts by mass or less, and preferably 5 parts by mass or more and 40 parts by mass or less. More preferably, it is 10 parts by mass or more and 30 parts by mass or less.

  The layer structure of the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired. However, from the viewpoint of making the film flexible, stretchable, shear deformable, moisture permeable, embossability, and comfortable tactile sensation like cloth, the layer A has a configuration located on at least one outermost surface. It is preferable to have a two-layer / three-layer configuration of A layer / B layer / A layer. In addition, the A layer and the B layer can be directly laminated or laminated with an adhesive layer therebetween, but flexibility, stretchability, shear deformation, moisture permeability, embossability, In order not to impair such a pleasant touch, it is preferable to laminate directly. That is, it is particularly preferable that the film of the present invention has an A layer / B layer / A layer two-layer / three-layer configuration and no other layer exists between the A layer and the B layer.

(Stiffening the surface layer)
When the film of the present invention has an A layer and a B layer, the ratio of the Young's modulus of the A layer to the Young's modulus of the B layer (Young's modulus of the A layer / B The Young's modulus of the layer is preferably 2.0 or more. In such a film, the friction coefficient is reduced by the relatively high Young's and hard A layer, and the decrease in shear deformability is suppressed by the relatively low Young's and soft B layer. Therefore, by setting it as such an aspect, it becomes easy to make compatible both a shear deformability and comfortable tactile sensations like cloth. Here, the Young's modulus of the A layer refers to the Young's modulus in the longitudinal direction of the A layer, and the Young's modulus of the B layer is similarly interpreted.

The Young's modulus of the A layer can be measured according to the method specified in JIS K7127 (1999) for a single film having the same composition and thickness as the A layer, and the Young's modulus of the B layer is the same. In addition, when the film has a laminated structure, the Young's modulus of the portion corresponding to the A layer and the portion corresponding to the B layer after the cross section of the laminated film is cut out by an ultramicrotome or the like is measured by the nanoindentation method (continuous stiffness measurement method). The Young's modulus of each layer can also be measured by analyzing by a known method such as the above. For example, “Nanoindenter XP” manufactured by MTS Systems, Inc. can be used as a measurement apparatus when performing measurement by the nanoindentation method, and the measurement conditions when using the apparatus are as follows.
Indenter: Diamond triangular pyramid indenter measurement frequency, amplitude: 45 Hz, 2 nm
Measurement atmosphere: room temperature / air measurement n number: 10
The Young's modulus can be calculated using a region with an indentation depth of 40 to 60 nm in the indentation depth diagram obtained under the above conditions.

  Note that the Young's modulus values of the A layer and the B layer are substantially the same regardless of which of the above methods is used, so the measurement method is appropriately selected in consideration of the possibility of manufacturing a single film. can do.

  The ratio of the Young's modulus of the A layer and the Young's modulus of the B layer is more preferably 2.5 or more, and more preferably 3.0 or more, from the viewpoint of making the shear deformability and the friction coefficient more preferable values. preferable. The upper limit of the ratio of the Young's modulus of the A layer to the Young's modulus of the B layer is 5.0 from the viewpoint of suppressing flow marks due to the difference in physical properties between the A layer and the B layer during film formation.

  The method for adjusting the ratio of the Young's modulus of the A layer and the Young's modulus of the B layer of the present invention to the above preferable range is not particularly limited as long as the effect of the present invention is not impaired. Examples include a method of using a thermoplastic resin having a Young's modulus of 200 MPa or more other than the thermoplastic elastomer, a method of adjusting the filler for the A layer, and the like. Specifically, by combining a thermoplastic elastomer having moisture permeability and crystallinity as a raw material for the A layer, a polyester thermoplastic resin such as polybutylene succinate and polylactic acid, and a polycarbonate thermoplastic resin are combined. The ratio of the Young's modulus to the Young's modulus of the B layer can be set to the above preferred value.

(Additive)
The film of this invention may contain components other than the component mentioned above in the range which does not impair the effect of this invention. For example, it contains antioxidants, UV stabilizers, anti-coloring agents, matting agents, antibacterial agents, deodorants, weathering agents, antioxidants, ion exchange agents, tackifiers, coloring pigments, dyes, etc. May be.

(Film production method)
Next, the method for producing the film of the present invention will be described more specifically, but the method for producing the film of the present invention is not limited to this.

  In obtaining a composition used for obtaining the film of the present invention, that is, a composition containing a thermoplastic elastomer, a filler and the like, a melt-kneading method is preferred in which the composition is produced by melt-kneading each component. The melt kneading method is not particularly limited, and a known mixer such as a kneader, roll mill, Banbury mixer, single screw or twin screw extruder can be used. Among these, from the viewpoint of productivity, it is preferable to use a single screw or twin screw extruder.

  Next, using the composition obtained by the above-described method, a non-oriented film can be produced by a known film production method such as an inflation method, a tubular method, or a T-die cast method.

  The obtained non-oriented film may be uniaxially stretched or biaxially stretched, but is stretched in order to set the shear hardness (G) and the compression work to the above-mentioned preferable ranges and to give embossability. Preferably not.

  After the film is formed, various surface treatments may be applied for the purpose of improving printability, laminate suitability, coating suitability, and the like. Examples of the surface treatment method include corona discharge treatment, plasma treatment, flame treatment, and acid treatment. Either method can be used, but a corona discharge treatment is more preferable from the viewpoint that continuous treatment is possible, the apparatus can be easily installed in an existing film forming facility, and the treatment is simple.

  The film formed by the method as described above is embossed between the embossing roll and the embossing roll to obtain the target film. At this time, the roll temperature is preferably 20 to 150 ° C., the nip pressure (linear pressure) is preferably 20 to 100 kg / cm, and the roll rotation speed is preferably 0.5 to 30 m / min.

(Other uses)
The film of the present invention thus obtained is a film having mechanical properties necessary for use as a film, a soft texture like a cloth, a pleasant touch, and a natural appearance. For example, as a film for sanitary materials It can be used suitably. Furthermore, the film of this invention is good also as a laminated body with a nonwoven fabric. In addition, the sanitary material including the film of the present invention has a soft texture, a pleasant tactile sensation, and a natural appearance.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto.

[Measurement and evaluation method]
Measurements and evaluations shown in the examples were performed under the following conditions.

(1) Thickness ratio of each layer of the laminated film A sample piece is cut out from the center part in the width direction of the film, and a longitudinal direction-thickness direction cross section (hereinafter sometimes referred to as a film cross section) of the sample piece is obtained using an ultramicrotome. Ultra-thin sections were collected at −100 ° C. so as to obtain an observation surface. Using a scanning electron microscope (S-3400N, manufactured by Hitachi High-Technologies Corporation), a photograph of the cross section of the film was taken at a magnification of 500 to 1,500 times, and each layer of the laminated film was measured using the length measurement function of the microscope. The thickness was measured. The measurement was performed 10 times while changing the observation location, and the average value of the obtained values was taken as the thickness (μm) of each layer of the laminated film, and the thickness ratio of each layer of the laminated film was calculated from these values. The thickness of the film and each layer was a value obtained by rounding off the first decimal place.

(2) Film shear strength (G)
The film was cut into a size of 12 cm (longitudinal direction) × 12 cm (width direction) and used as a sample, which was attached to a test bench. Next, using a shear tester KES-FB1-A manufactured by Kato Tech Co., Ltd., a sample having a load of 10 gf and a shear shear rate of 0.417 mm / sec in an atmosphere of 23 ° C. and a relative humidity of 65% was −8. The shear stress was measured at points where the shear deformation was -2.5 °, -0.5 °, 0.5 °, and 2.5 ° (hereinafter referred to as each point). the shear stress respectively _{HG -2.5, HG -0.5, HG 0.5} , sometimes referred _{HG 2.5.).} From HG _0.5 and HG _2.5 , the following equation G1 is used to determine the shear strength (G (+)) in the positive direction, and from HG _-2.5 and HG _-0.5 , the following equation G2 is used to indicate the negative direction. Shear hardness (G (-)) was calculated. Measurement of shear stress and calculation of G (+) and G (-) are performed 3 times in the longitudinal direction and in the width direction (6 times in total), and the average value of all G (+) and G (-) values The value obtained by rounding off the third decimal place was defined as the shear hardness (G) (gf / (cm · deg)) of the film.
Formula G1: G (+) = (HG _2.5 −HG _0.5 ) / (2.5 ° −0.5 °)
Formula G2: G (−) = (HG _−2.5 −HG _−0.5 ) / (− 2.5 ° − (− 0.5 °))
When measuring the shear strength (G) in the longitudinal direction, the sample is attached so that the longitudinal direction of the film is orthogonal to the shear deformation direction, and when measuring the shear strength (G) in the width direction, the width of the film The sample was mounted so that the direction was perpendicular to the shear deformation direction.

(3) Variation in surface roughness of the X plane (SMD)
The film was cut into a size of 12 cm (longitudinal direction) × 12 cm (width direction) and used as a sample, and the film was attached to the test stand so that the X plane was the measurement plane. Next, using a surface property tester KES-SE-SR-U manufactured by Kato Tech Co., Ltd., slipping on the measurement surface with a load of 5 gf and a speed of 1 mm / sec in an atmosphere of a room temperature of 23 ° C. and a relative humidity of 65%. The child was moved in parallel with the longitudinal direction of the film, and the fluctuation of the surface roughness in the longitudinal direction was measured. Thereafter, similarly, the slider was moved in parallel with the film width direction, and the fluctuation of the surface roughness in the width direction was measured. The surface roughness variation in the longitudinal direction and the width direction was measured three times, and the value obtained by averaging the absolute values of all the values was defined as the surface roughness variation (SMD) (μm) of the X plane. As the slider, a piano wire having a length of 5 mm and a diameter of 0.5 mm was used. The X plane was determined through the measurement described in “(9) Depth and number of film recesses” described later. When there was no X surface, the surface having a recess was used as the measurement surface, and when there was no recess, the outer surface of the winding was used as the measurement surface. The same applies to the case where the X plane is the measurement plane.

(4) X-plane friction coefficient variation (MMD)
The film was cut into a size of 12 cm (longitudinal direction) × 12 cm (width direction) and used as a sample, and the film was attached to the test stand so that the X plane was the measurement plane. Next, using a surface property tester KES-SE-SR-U manufactured by Kato Tech Co., Ltd., slipping on the measurement surface with a load of 25 gf and a speed of 1 mm / sec in an atmosphere of a room temperature of 23 ° C. and a relative humidity of 65%. The child was moved parallel to the longitudinal direction, and the variation of the friction coefficient in the longitudinal direction was measured. Thereafter, similarly, the slider was moved in parallel with the width direction, and the fluctuation of the friction coefficient in the width direction was measured. The variation of the friction coefficient in the longitudinal direction and the width direction was measured three times, and the value obtained by averaging the absolute values of all the values was defined as the variation (MMD) of the friction coefficient of the X plane. In addition, as a slider, what arranged the piano wire 20 length 5mm and diameter 0.5mm in parallel without gap was used.

(5) Feeling of contact cooling / heating of the film (Qmax)
Using a Thermolab KES-F7II manufactured by Kato Tech Co., Ltd., the contact cold / warm feeling (Qmax) of the film was measured under the conditions of an ambient temperature of 23 ° C. and a relative humidity of 65%. Thermo-lab KES-F7II manufactured by Kato Tech Co., Ltd. is equipped with a sample stage for installing a film and a detector. A copper thin plate is attached to one side of the detector, and a temperature sensor is attached to the back side of the copper thin plate. Is attached. A heater is attached to the sample stage and the detector, and the temperature can be set independently by a control device. The film was placed on the sample stage so that the outer surface of the film became the measurement surface, the temperature of the sample stage was set to 20 ° C. by the control device, and the temperature of the copper thin plate of the detector was set to 30 ° C. Next, the sample stage on which the film was placed and the detector were brought into contact under the conditions of a load of 6 gf / cm ² and a contact area of 50 mm × 50 mm, and at the same time, the sensor output from the temperature sensor was recorded. The measurement was performed 10 times, and the average of the obtained values was defined as the contact cold / warm feeling (Qmax) of the film.

(6) Compression work of film A film was cut into a size of 12 cm (longitudinal direction) x 12 cm (width direction) and attached to a test stand. Next, using an automated compression test apparatus KES-FB3-A manufactured by Kato Tech, the attached sample was compressed between steel plates having a circular plane with an area of 2 cm ² , a compression speed of 20 μm / sec, a maximum compression load of 10 gf / cm ² , room temperature. The film was compressed under an atmosphere of 23 ° C. and a relative humidity of 65%, and the compression work (gf · cm / cm ² ) of the film was measured. The measurement was performed 3 times (6 times in total) on both the inner and outer surfaces of the film, and the value obtained by rounding off the fourth decimal place of the average value of all the data was defined as the compression work of the film.

(7) The bending resistance of the film was measured in accordance with JIS-L1096: 2010 Method A (45 ° cantilever method).

(8) Embossing Embossing was performed through a film between any of the following embossing rolls (I) to (VII) set in the electric heating type embossing machine HTEM-300 type manufactured by Yuri Roll Co., Ltd. and a rubber roll. The temperature of the embossing roll and rubber roll was 120 ° C., the nip pressure (linear pressure) was 50 kg / cm, and the rotation speed was 3.0 m / min.
<Emboss roll (I)>
Pattern: unevenness on the surface of a square convex embossing roll: 1000 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
<Emboss roll (II)>
Pattern: unevenness on the surface of a square convex embossing roll: 500 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
<Emboss roll (III)>
Pattern: unevenness on the surface of the square convex embossing roll: 1300 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
<Emboss roll (IV)>
Pattern: Convex difference on the surface of a square convex embossing roll: 300 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
<Emboss roll (V)>
Pattern: unevenness on the surface of the square convex embossing roll: 1500 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
<Emboss roll (VI)>
Pattern: unevenness on the surface of a square convex embossing roll: 80 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
<Emboss roll (VII)>
Pattern: unevenness on the surface of a square convex embossing roll: 2000 μm
Embossing roll surface unevenness pitch: 2,000 μm
Convex area: 4 mm ²
The unevenness on the surface of the embossing roll refers to the height of the protrusion on the surface of the embossing roll (corresponding to d in FIG. 2), and the pitch of the unevenness on the surface of the embossing roll refers to the unevenness of the film provided periodically. This is the length of one cycle of the part. (Corresponding to e in FIG. 2) The crimping area refers to the area of the embossing roll surface having the highest height per pattern of the embossing roll (corresponding to f × g in FIG. 3).

(9) Cut the sample piece from the depth of the film recess and the center part of the number film, and cut with an ultramicrotome at -100 ° C. parallel to the film width direction (hh ′ in FIG. 4) and perpendicular to the film surface. Then, the cross-section was performed. The microscope was observed from the horizontal direction at a magnification (for example, 5 times) at which the depth of the concave portion could be confirmed, and the image was taken. Subsequently, image capturing was repeated while shifting the observation position in the horizontal direction, and cross-sectional images for a continuous region over a length of 2 cm were collected. In the obtained cross-sectional image, the depth of the concave portion was measured, and the concave portion having a depth from the baseline of 100 μm to 1,500 μm was extracted. Subsequently, the film was cut perpendicularly to the film surface along the direction (ii ′ in FIG. 4) rotated clockwise by 15 ° in the plane from the width direction of the film, and the section was similarly extracted. Went. Thereafter, as shown in FIG. 4, the cutting angle in the film plane is shifted by 15 ° (jj ′ → n−n ′ in FIG. 4) to obtain cross-sections with different in-plane cutting angles, and in each case, the recesses are recessed. Was extracted. The cross-section was performed seven times in total. The average value was calculated | required about the depth of the recessed part from each cross section obtained in this way, and it was set as the depth of the recessed part. Subsequently, a sample piece of 10 cm (longitudinal direction) × 10 cm (width direction) was cut out from the center portion in the width direction of the film, and the number of recesses was measured visually using a sample having an area of 100 cm ² . The X plane was determined from the depth and number of film recesses.

(10) Appearance of the film having concave portions of the film when viewed from the X-plane direction was evaluated by the following criteria for 24 people.
A: The number of people who answered that it was a natural appearance like cloth was 20-24.
B: The number of people who answered that it was a natural appearance like cloth was 15-19.
C: The number of people who answered that it was a natural appearance like cloth was 10-14.
D: The number of people who answered that it was a natural appearance like cloth was 5-9.
E: The number of people who answered that it was a natural appearance like cloth was 0-4.
As for the appearance, A was the most excellent, and it was judged that if it had an evaluation of D or more, it could withstand practicality.

(11) Coefficient of friction of X surface Using a surface property tester KES-SE manufactured by Kato Tech Co., Ltd., the film is cut into a size of 12 cm (longitudinal direction) × 12 cm (width direction), and the X surface is the measurement surface A standard friction element (fingerprint type) is attached as a slider, and the slider is moved on the surface of the A layer of the film at a load of 25 gf and a speed of 1 mm / sec. The friction coefficient of the X surface of the film was measured under the condition of 65% atmosphere. Measurement was performed three times in each of the longitudinal direction and the width direction (6 times in total), and the average value of all the data was defined as the friction coefficient of the X plane.

(12) Weight per unit area (mass per unit area)
In accordance with JIS L 1913 (2010), 10 test pieces of 10 cm square in the width direction and 10 cm square in the longitudinal direction were collected from the center portion in the width direction of the film in parallel with the longitudinal direction, and the respective masses were measured. After calculating these average values, the mass per 1 m ² was converted to the basis weight (g / m ² ).

[Thermoplastic elastomer having crystallinity]
(A1)
Before using the polyester elastomer (trade name: “Hytrel” (registered trademark) G3548, manufactured by Toray DuPont Co., Ltd.), it was dried at 90 ° C. for 5 hours in a rotary vacuum dryer.
(A2)
Before using the polyester elastomer (trade name: “Hytrel” (registered trademark) HTR8206, manufactured by Toray DuPont Co., Ltd.), it was dried at 90 ° C. for 5 hours in a rotary vacuum dryer.
(A3)
Polyolefin elastomer (trade name: “ACRlift” (registered trademark) WH303, manufactured by Sumitomo Chemical Co., Ltd.)
(A4)
Before using the polyamide-based elastomer (trade name: “PEBAX” (registered trademark) MV1073, manufactured by Arkema Co., Ltd.), it was dried in a rotary vacuum dryer at 90 ° C. for 5 hours.

[Amorphous thermoplastic elastomer]
(B1)
Urethane elastomer (trade name: OP85A10, manufactured by BASF Japan Ltd.). Before use, it was dried at 90 ° C. for 5 hours in a rotary vacuum dryer.

[Filler (C)]
(C1)
Calcium carbonate (trade name: SCP E # 810, aspect ratio 2, average particle size 3.0 μm, manufactured by Sankyo Seimitsu Co., Ltd.)
[Resins other than thermoplastic elastomers]
(D1)
Polyethylene resin (trade name: NUC8506, manufactured by Nippon Unicar Co., Ltd.)
(D2)
Polybutylene succinate resin (trade name “GSPla” (registered trademark) FZ91PN, manufactured by Mitsubishi Chemical Corporation)
[Production of film]
(Examples 1-8, Comparative Examples 2-3)
Each raw material was supplied to a twin screw extruder with a vacuum vent of 44 mm with a cylinder diameter of 190 ° C. and melted and kneaded so as to have the blending ratio shown in Table 1, and homogenized and then pelletized to obtain a composition. . The pellets of this composition were vacuum-dried at a temperature of 90 ° C. for 5 hours using a rotary drum type vacuum dryer. The pellets of the vacuum-dried composition were supplied to a single screw extruder having a cylinder diameter of 200 ° C. and a screw diameter of 60 mm by an inflation method, and a circular die having a diameter of 250 mm, a lip clearance of 1.0 mm, and a temperature set to 190 ° C. The product was extruded upward in a bubble shape at a blow ratio of 2.0, air-cooled by a cooling ring, taken up while being folded by a nip roll above the die, and wound into a roll. Subsequently, between the embossing roll and the rubber roll shown in Table 1 set in the electric heating type embossing machine “HTEM-300 type” manufactured by Yuri Roll Co., Ltd., a roll temperature of 120 ° C. (both upper and lower stages), nip pressure ( It was embossed by passing under conditions of (linear pressure) 50 kg / cm and roll rotation speed 5.0 m / min. Table 1 shows the physical properties and evaluation results of the film obtained.

(Comparative Example 1)
A film before shaping was obtained in the same manner as in Example 1 except that the composition shown in Table 1 was used. Table 1 shows the physical properties and evaluation results of the film obtained.

(Examples 9 and 10)
The raw materials for the A layer and the B layer were supplied to a twin screw extruder with a vacuum vent with a screw diameter of 44 mm and a cylinder temperature of 190 ° C. so as to achieve the blending ratio shown in Table 2, and were melt-kneaded and homogenized. Later, pelletized to obtain a composition. The pellets of this composition were vacuum-dried at a temperature of 90 ° C. for 5 hours using a rotary drum type vacuum dryer to obtain compositions for A layer and B layer. Subsequently, these compositions were supplied to a single-layer extruder for layer A and a single-screw extruder for layer B, each having a cylinder temperature of 200 ° C. and a screw diameter of 60 mm, and had a diameter of 250 mm, a lip clearance of 1.0 mm, and a temperature of 190 Extruded upward in a bubble shape at a blow ratio: 2.0 from a spiral annular die at 0 ° C. so as to have a two-layer / three-layer configuration of A layer / B layer / A layer, and air-cooled with a cooling ring. Then, it was taken up and wound into a roll while being folded by a nip roll above the die. The obtained laminated film was embossed by the same method as in Example 1 and by using the embossing roll shown in Table 2 by the same method as in Example 1. Table 2 shows the physical properties and evaluation results of the obtained film.

In Tables 1 and 2, “thermoplastic elastomer having crystallinity (mass%)”, “amorphous thermoplastic elastomer (mass%)”, and “resin other than thermoplastic elastomer” are 100 resins in each layer. Calculated as mass%.
The “parts by mass” of the “filler” item in Tables 1 and 2 was calculated based on 100 parts by mass of the entire resin of each layer.

  According to the present invention, it is possible to provide a film having mechanical properties necessary for use as a film, a soft texture like a cloth, a pleasant touch feeling, and a natural appearance. Specifically, the film of the present invention can be applied to medical / hygienic materials such as bed sheets, pillow covers, back sheets of absorbent articles such as sanitary napkins and paper diapers, clothing materials such as rainy clothing, gloves, garbage bags and compost. For packaging materials such as bags, bags for foods such as vegetables and fruits, bags for various industrial products, building materials such as buildings, houses, decorative panels, interior materials in construction equipment such as railway vehicles, ships, and aircraft, and building materials It can be preferably used.

c1: Film c2: Base line c3: Depth depth d: Concavity and convexity difference on the surface of the embossing roll e: Pitch of concavity and convexity on the surface of the embossing roll f × g: Crimping area hh ′: Cutting surface i parallel to the longitudinal direction -I ': Cutting plane jj' shifted 15 degrees clockwise relative to hh ': Cutting plane kk' shifted deg. 15 degrees clockwise relative to ii ': jj' Cutting surface ll ′ shifted 15 ° clockwise relative to the cutting surface mm ′ offset 15 ° clockwise relative to kk ′: 15 ° clockwise relative to ll ′ Shifted cutting surface nn ′: Cutting surface shifted 15 ° clockwise relative to mm ′

Claims (5)

When a surface having 25 to 1,000 recesses per 100 cm ² having a depth of 100 μm or more and 1,500 μm or less from the base line is defined as an X surface, it has at least one X surface and at least one X surface. A film having a surface friction coefficient of 0.35 or less and a bending resistance of 30 mm or less.   At least one X-plane has a surface roughness variation (SMD) measured according to the KES method of 0.1 μm or more and 1 μm or less, and a coefficient of friction variation (MMD) measured according to the KES method is 0.005. The film according to claim 1, wherein the film is 0.07 or less. In at least one of the X plane, contact cold feeling as measured according to KES method (Qmax), characterized in that at 0.02 W / cm ² or more 0.50 W / cm ² or less, to claim 1 or 2 The film described.   The film according to claim 1, comprising a thermoplastic elastomer. The film according to claim 1, comprising a filler.