JP6668770B2 - Film with excellent tactile sensation - Google Patents

Description

  The present invention relates to a film having mechanical properties necessary for use as a film, having a cushioning property like a cloth, and having a comfortable touch.

  In recent years, a single film having a plurality of functions has been required.For example, in the field of medical and sanitary materials, it has mechanical properties necessary for use as a film, and has a cushioning property like a cloth, which is comfortable. A film having a tactile sensation is desired.

  Until now, various developments have been made to improve the tactile sensation of the film. For example, Patent Document 1 discloses that a moisture-permeable film having an improved tactile sensation can be obtained by mixing a olefin resin with a filler having an average particle diameter of 2 μm or more and stretching the mixture. Further, Patent Document 2 discloses that an olefin resin is at least uniaxially stretched to form a concavo-convex pattern by embossing, thereby improving the moisture permeability and the tactile sensation of the film.

JP-A-11-138873 Japanese Patent Publication No. 06-076501

  However, in the technology described in Patent Document 1 described above, although the slipperiness and moisture permeability of the film are improved to some extent by setting the coefficient of friction of the film within a specific range, the film has cushioning properties like a cloth and has a comfortable feeling. It did not lead to a film with a good feel. Further, in the technology described in Patent Document 2, although a film is formed to have a regular uneven pattern, the moisture permeability and tactile sensation of the film are improved to some extent, but the film has cushioning properties like a cloth and has a pleasant tactile sensation. No film was obtained. That is, these techniques have a problem that a film having the mechanical properties necessary for use as a film, having a cushioning property like a cloth, and having a comfortable tactile sensation cannot be obtained.

  The present invention improves the drawbacks of the prior art, and provides a film having a mechanical property necessary for use as a film, and having a cushioning property like a cloth, having a pleasant tactile sensation, and a method for producing the same. The subject.

In order to solve the above problems, the present invention has the following configurations.
(1) The work of compression measured according to the KES method is 0.015 gf · cm / cm ² or more and 1.0 gf · cm / cm ² or less, and the friction coefficient measured according to the KES method is 0.05 or more. 7. A film characterized by being 7 or less.
(2) The film according to (1), wherein the compression work amount is 0.05 gf · cm / cm ² or more and 0.4 gf · cm / cm ² or less.
(3) On at least one surface, the variation in surface roughness (SMD) measured according to the KES method is from 1.2 μm to 16 μm, and the variation in friction coefficient (MMD) is from 0.003 to 0.07. The film according to (1) or (2), which is as follows.
(4) contact cold feeling as measured according to KES method (Qmax), characterized in that at 0.02 W / cm ² or more 0.45 W / cm ² or less, to any one of (1) to (3) The film as described.
(5) The film according to any one of (1) to (4), wherein the coefficient of friction is 0.41 or more and 0.65 or less.
(6) The method according to any one of (1) to (5), wherein the shear hardness measured according to the KES method is 0.1 gf / (cm · deg) or more and 6 gf / (cm · deg) or less. Film.
(7) A resin selected from the group consisting of ethylene-methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylic acid copolymer The film according to any one of (1) to (6), comprising at least one kind.
(8) The film according to any one of (1) to (7), wherein the porosity is 20% or more and 90% or less.
(9) The film according to any one of (1) to (8), which is obtained from a composition containing a foaming agent.
(10) The film according to any one of (1) to (9), which has a single-layer structure.
(11) The film according to any one of (1) to (10), wherein the film is a sanitary material film.
(12) A laminate of the film according to any one of (1) to (11) and a nonwoven fabric.
(13) The method for producing a film according to any one of (1) to (11), wherein the composition used to obtain the film in the production process is foamed to form pores in the film. The method for producing a film.
(14) The method for producing a film according to any one of (1) to (11), comprising a step of subjecting the film to a rubbing process.

  According to the present invention, it is possible to provide a film having a mechanical property necessary for use as a film, having a cushioning property like a cloth, and having a comfortable touch, and a laminate of the film and a nonwoven fabric.

The film of the present invention has a compression work measured by the KES method of 0.015 gf · cm / cm ² or more and 1.0 gf · cm / cm ² and a friction coefficient of 0.05 measured by the KES method. It is important that the value be not less than 0.7 and not more than 0.7.

  Hereinafter, desirable modes for carrying out the present invention will be described, but the present invention is not limited thereto.

(Compression work)
The film of the present invention is characterized by having a cushioning property like a cloth and having a pleasant tactile sensation. Here, the cushioning property is an index indicating bulkiness and flexibility, and can be expressed by using the work (compression work) when the film is compressed as a scale. The compression work can be measured according to the Kawabata Evaluation System (hereinafter, KES) method, and a detailed measuring method will be described later. Hereinafter, the compression work measured according to the KES method is simply referred to as compression work.

It is important that the film of the present invention has a compression work of from 0.015 gf · cm / cm ^{2 to} 1.0 gf · cm / cm ² . When the compression work amount is less than 0.015 gf · cm / cm ² , the cushioning property and the tactile sense of the film are reduced. Conversely, if it exceeds 1.0 gf · cm / cm ² , the cushioning property of the film is excellent, but the film becomes too bulky, so that not only the winding property and the handling property are deteriorated, but also printing and bonding are performed. The post-working suitability at the time of performing post-working also decreases.

That is, the compression work amount is 0.02 gf · cm / cm from the viewpoint of achieving both the winding property, the handling property, and the post-processing suitability as a film, and imparting a cushioning property and a comfortable tactile sensation to the film. It is more preferably not less than ^{2 and not} more than 0.6 gf · cm / cm ² , more preferably not less than 0.04 gf · cm / cm ^{2 and not} more than 0.5 gf · cm / cm ² , and more preferably 0.05 gf · cm / cm 2. more preferably ² or more 0.4gf · cm / cm ² or less, more preferably 0.06gf · cm / cm ² or more 0.35gf · cm / cm ² or less, 0.07gf · cm / cm ² or more preferably 0.3gf · cm / cm ² or less, 0.09gf · cm / cm ² or more 0.28gf · cm / cm ² or less it is further Preferably, particularly preferably at 0.12gf · cm / cm ² or more 0.26gf · cm / cm ² or less, it is 0.15gf · cm / cm ² or more 0.24gf · cm / cm ² or less and most preferable.

The method for controlling the compression work of the film of the present invention to 0.015 gf · cm / cm ² or more and 1.0 gf · cm / cm ² or the preferable range described above is not particularly limited as long as the effects of the present invention are not impaired. Although not mentioned, for example, a process for imparting fine fluff to the surface of a film produced by a production method described later may be mentioned. Examples of processing for imparting fine fluff to the film surface include blasting, in which fine sand (abrasive material) is projected (sprayed) to impart fine fluff to the film surface, or a film using a rubbing cloth. Rubbing, etc., which physically rubs the surface of the rubbing, but from the viewpoint of setting the compression work amount to 0.015 gf · cm / cm ² or more and 1.0 gf · cm / cm ² or the preferable range described above. Processing is preferred. That is, the film of the present invention is preferably a film obtained by performing a rubbing process.

(Coefficient of friction)
The film of the present invention has a coefficient of friction of 0.05 or more and 0.7 or less from the viewpoint of achieving both a cushioning property and a pleasant tactile feeling like cloth, and a winding property, a handling property, and a post-processing suitability as a film. This is very important. The coefficient of friction is an index indicating the roughness of the film surface. The coefficient of friction refers to a coefficient of friction measured according to the KES method, and a detailed measuring method will be described later. Hereinafter, the coefficient of friction measured according to the KES method is simply referred to as a coefficient of friction.

  When the friction coefficient is smaller than 0.05, not only the cushioning property and the tactile sensation of the film are reduced, but also the film may be displaced or meandered, and the winding property and the handling property are deteriorated. On the other hand, if it is larger than 0.7, although the cushioning property of the film may be obtained, when the different surfaces are sequentially laminated at the time of the forming process, the films do not slip and a feeding failure occurs, and the processing efficiency is reduced. In some cases, handling properties and post-processing suitability deteriorate.

  In other words, the coefficient of friction is 0.25 or more and 0.68 or less from the viewpoint of achieving both the winding property as a film, the handling property, and the suitability for post-processing and imparting a cushioning property and a comfortable tactile sensation to the film. Is more preferably 0.3 or more and 0.65 or less, particularly preferably 0.35 or more and 0.65 or less, and most preferably 0.41 or more and 0.65 or less. preferable.

  The method for adjusting the coefficient of friction of the film of the present invention to 0.05 or more and 0.7 or less, or the preferable range described above, is not particularly limited as long as the effects of the present invention are not impaired. The surface of the film may be subjected to blasting or rubbing. In addition, rubbing is preferable from the viewpoint of setting the coefficient of friction to be 0.05 or more and 0.7 or less, or the above preferable range. That is, the film of the present invention is preferably a film obtained by performing a rubbing process.

(Surface roughness variation (SMD))
The film of the present invention has a surface roughness variation (SMD) of at least 1.2 μm and not more than 16.0 μm measured on at least one side according to the KES method from the viewpoint of imparting a comfortable tactile sensation to the film. Is preferred.

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

  Focusing on improving the comfort of the tactile sensation of the film and the productivity and film formation stability of the film, the surface roughness variation (SMD) of at least one surface is from 1.3 μm to 10.0 μm. More preferably, it is more preferably 1.4 μm or more and 9.0 μm or less, more preferably 1.6 μm or more and 7.0 μm or less, more preferably 1.8 μm or more and 6.0 μm or less, It is more preferably 2.0 μm or more and 5.5 μm or less, further preferably 2.2 μm or more and 5.0 μm or less, particularly preferably 2.4 μm or more and 4.5 μm or less, and more preferably 2.6 μm or more and 4 μm or less. Most preferably, it is not more than 0.0 μm.

(Fluctuation of friction coefficient (MMD))
In the film of the present invention, from the viewpoint of imparting a comfortable tactile sensation to the film, at least one surface may have a coefficient of friction fluctuation (MMD) measured according to the KES method of 0.003 or more and 0.07 or less. preferable.

  Specifically, the variation of the coefficient of friction (MMD) measured according to the KES method is defined by the KES method under an atmosphere of 23 ° C. and a relative humidity of 65% with a load of 25 gf and a moving speed of the slider of 1 mm / sec. It refers to the variation (MMD) of the measured coefficient of friction. Hereinafter, the fluctuation of the coefficient of friction (MMD) measured according to the KES method may be simply referred to as the fluctuation of the coefficient of friction (MMD).

  Focusing on improving the tactile sensation of the film, and improving the productivity and film formation stability of the film, it is required that at least one surface has a coefficient of friction variation (MMD) of 0.003 or more and 0.06 or less. Is more preferably 0.003 or more and 0.05 or less, more preferably 0.003 or more and 0.04 or less, more preferably 0.003 or more and 0.03 or less, and 0 It is more preferably 0.003 or more and 0.025 or less, further preferably 0.003 or more and 0.02 or less, particularly preferably 0.003 or more and 0.015 or less, and 0.003 or more and 0.05 or less. It is most preferably at most 013.

(Simultaneous fluctuation of surface roughness (SMD) and fluctuation of friction coefficient (MMD))
From the viewpoint of improving the tactile sensation of the film, the productivity of the film and the stability of film formation, at least one surface has a surface roughness variation (SMD) of 1.2 μm or more and 16.0 μm or less, and The variation (MMD) of the coefficient of friction is preferably 0.003 or more and 0.07 or less, the variation (SMD) of the surface roughness is 1.3 μm or more and 10.0 μm or less, and the variation (MMD) of the friction coefficient. Is more preferably 0.003 or more and 0.06 or less, the surface roughness variation (SMD) is 1.4 μm or more and 9.0 μm or less, and the friction coefficient variation (MMD) is 0.003 or more and 0 or less. 0.05 or less, more preferably, the surface roughness variation (SMD) is 1.6 μm or more and 7.0 μm or less, and the friction coefficient variation (MMD) is 0.003 or more and 0.04 or less. Is more More preferably, the variation in surface roughness (SMD) is 1.8 μm or more and 6.0 μm or less, and the variation (MMD) in friction coefficient is 0.003 or more and 0.03 or less. More preferably, the variation (SMD) is 2.0 μm or more and 5.5 μm or less, the variation of friction coefficient (MMD) is 0.003 or more and 0.025 or less, and the variation of surface roughness (SMD) is 2 or more. More preferably, the variation of friction coefficient (MMD) is 0.003 or more and 0.02 or less, and the variation of surface roughness (SMD) is 2.4 or more and 4.5 μm. It is particularly preferable that the variation (MMD) of the coefficient of friction is 0.003 or more and 0.015 or less, the variation (SMD) of the surface roughness is 2.6 μm or more and 4.0 μm or less, and Coefficient fluctuation It is most preferred MMD) is 0.003 more than 0.013 or less.

  An aspect in which at least one surface of the film of the present invention has a surface roughness variation (SMD) of 1.2 μm or more and 16 μm or less and a friction coefficient variation (MMD) of 0.003 or more and 0.07 or less. The method for setting the variation of the surface roughness (SMD) and the variation of the coefficient of friction (MMD) within the above preferred ranges is not particularly limited as long as the effects of the present invention are not impaired. Examples thereof include a method of blending a foaming agent or the like in a preferred type and ratio described later, a method of adding a filler described later, and a method of rubbing.

  More specifically, by increasing the content of the foaming agent, increasing the content of the filler, and performing rubbing, the variation of the surface roughness (SMD) and the variation of the coefficient of friction (MMD) are increased. Can be done.

(Contact cold and 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 0.45 W / cm ² or less .

The contact cold / hot sensation measured according to the KES method is generally an index for evaluating whether a person feels cold or warm when touching an object. The value of the contact cold / hot sensation (Qmax) measured according to the KES method increases as the object feels cold when touched, and decreases as the object feels warm. Hereinafter, the contact cold / hot sensation (Qmax) measured according to the KES method may be simply referred to as the contact cold / hot sensation (Qmax). When the contact cold and warm feeling (Qmax) is 0.45 W / cm ² or less, the skin feels warm when it touches the film. It can be preferably used for certain applications. From the viewpoint of application to sanitary materials, the lower limit of the contact cold / hot feeling (Qmax) is sufficient to be 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 0.02 W / cm ² or more 0.42 W / cm ² or less, 0.02 W / cm ² or more 0.39W more preferably / cm ² or less, it is more preferably 0.02 W / cm ² or more 0.36 W / cm ² or less, 0.02 W / cm ² or more 0.33 W / cm ² or less more preferably, more preferably 0.02 W / cm ² or more 0.30 W / cm ² or less, more preferably 0.02 W / cm ² or more 0.27 W / cm ² or less, 0.02 W / cm more preferably ² or more 0.24 W / cm ² or less, further preferably 0.02 W / cm ² or more 0.21 W / cm ² or less, 0.02 W / cm ² or more Particularly preferably 0.19 W / cm ² less, and most preferably 0.02 W / cm ² or more 0.17 W / cm ² or less.

The method for adjusting the contact cold / hot sensation (Qmax) of the film of the present invention to 0.45 W / cm ² or less, or the above preferable range is not particularly limited as long as the effects of the present invention are not impaired. Examples of the method include a method of blending an agent or the like in a preferred type and ratio described later, a method of adding a filler described later, and a method of rubbing.

  More specifically, by increasing the content of the foaming agent, increasing the content of the filler, and performing rubbing, the numerical value of the contact cold / hot feeling (Qmax) of the film can be reduced.

(Shear hardness)
The film of the present invention may have a shear hardness of not less than 0.1 gf / (cm · deg) and not more than 6 gf / (cm · deg) measured in accordance with the KES method from the viewpoint of imparting shear deformation such as cloth. preferable. Shear deformation is the most easily deformed form that a cloth constituted by the intersection of a warp and a weft is the one that a two-dimensional cloth can easily cover a three-dimensional curved surface. The cloth greatly depends on the deformation and has a large shear deformation, that is, a cloth having a small shear hardness is more easily fitted to a curved surface such as a human body and has a good feeling of wearing. This shear hardness can be measured according to the KES method, and the measuring method will be described later. Hereinafter, the shear hardness measured according to the KES method is simply referred to as shear hardness.

  From the viewpoint of imparting shear deformability to the film like a cloth, the shear hardness is more preferably 0.1 gf / (cm · deg) or more and 5 gf / (cm · deg) or less, and 0.1 gf / (cm). Deg) or more and 4 gf / (cm · deg) or less, more preferably 0.1 gf / (cm · deg) or more and 3 gf / (cm · deg) or less, and 0.1 gf / (cm). Deg) to 2 gf / (cm · deg), more preferably 0.1 gf / (cm · deg) to 1 gf / (cm · deg), and more preferably 0.1 gf / (cm · deg). Deg) or more and 0.8 gf / (cm · deg) or less, more preferably 0.1 gf / (cm · deg) or more and 0.6 gf / (cm · deg) or less. The preferred, and most preferably 0.1gf / (cm · deg) or 0.4gf / (cm · deg) or less.

  A method for setting the shear hardness of the film of the present invention to 0.1 gf / (cm · deg) or more and 6 gf / (cm · deg) or less, or the above preferable range is not particularly limited as long as the effects of the present invention are not impaired. However, for example, blasting or rubbing may be applied to the surface of a film manufactured by a manufacturing method described below. From the viewpoint of setting the shear hardness to 0.1 gf / (cm · deg) or more and 6 gf / (cm · deg) or less, or the above preferable range, rubbing is preferable. That is, the film of the present invention is preferably a film obtained by performing a rubbing process.

(Thermoplastic resin A)
The film of the present invention may contain any resin as long as the effects of the present invention are not impaired.However, from the viewpoint of imparting a cushioning property and a comfortable tactile feeling like cloth, and a shearing property like cloth, ethylene- Methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, and at least one resin selected from the group consisting of ethylene-methacrylic acid copolymer Is preferred. Here, ethylene-methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylic acid copolymer are collectively referred to as thermoplastic resins. Expressed as A.

  Here, ethylene-methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylic acid copolymer mean ethylene and copolymerizable monomer. It is a copolymer with a monomer. Here, the copolymerizable monomer refers to methyl methacrylate, methyl acrylate, ethyl acrylate, vinyl acetate, and methacrylic acid. The copolymerization amount of the copolymerizable monomer is not particularly limited as long as the effects of the present invention are not impaired.However, taking an ethylene-methyl methacrylate copolymer as an example, ethylene and methyl methacrylate, which is a copolymerizable monomer, are used. Is 100% by mass, methyl methacrylate is preferably 0.5% by mass or more and 35% by mass or less, more preferably 5% by mass or more and 30% by mass or less. The same applies to other copolymers such as ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylic acid copolymer.

  The thermoplastic resin A, in addition to providing the film with a cushioning property and a comfortable tactile sensation like a cloth, and a shearing property like a cloth, and taking into account economical efficiency, availability, and film forming stability, ethylene- Methyl methacrylate copolymer is more preferred.

  The content of the thermoplastic resin A in the film is not particularly limited as long as the effects of the present invention are not impaired. However, from the viewpoint of further improving the shearing property, a total of 50% by mass of the thermoplastic resin A in 100% by mass of the resin. %, Preferably not less than 60% by mass and not more than 90% by mass, more preferably not less than 70% by mass and not more than 85% by mass.

(Resins other than thermoplastic resin A)
The film of the present invention is characterized in that the compression work, the coefficient of friction, the variation of the surface roughness (SMD), the variation of the coefficient of friction (MMD), the feeling of cold and warm contact (Qmax), and the hardness of the shear are in the above-mentioned preferred ranges. And a resin other than the thermoplastic resin A. The resin other than the thermoplastic resin A may be one type or a plurality of types as long as the effects of the present invention are not impaired. As the resin other than the thermoplastic resin A, polyester can be suitably used. is there.

  Examples of the polyester herein include polylactic acid, polyhydroxyalkanoic acid such as polyhydroxybutyrate, polycaprolactone, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene succinate, polybutylene succinate, polyethylene adipate, and polybutylene succinate. Nate adipate, polyethylene terephthalate / isophthalate copolymer, polypropylene terephthalate / isophthalate copolymer, polybutylene terephthalate / isophthalate copolymer, polyhexamethylene terephthalate / isophthalate copolymer, polycyclohexane-1,4-di Methylol terephthalate / isophthalate copolymer and the like can be mentioned.

  However, it is preferable to use polylactic acid from the viewpoint of film forming property and reduction of environmental load, and it is more preferable to use amorphous polylactic acid. Here, the amorphous polylactic acid refers to a clear polylactic acid derived from the polylactic acid component when its melting point is measured by a differential scanning calorimeter (DSC) in an appropriate temperature range after the polylactic acid is sufficiently heated. Polylactic acid that does not show a significant melting point. The method for measuring the melting point by DSC will be described later.

  The content of the resin other than the thermoplastic resin A is not particularly limited as long as the effects of the present invention are not impaired, but the work of compression, the coefficient of friction, the change in surface roughness (SMD), the change in the coefficient of friction (MMD), the contact From the viewpoint of further improving the cooling sensation (Qmax) and the shear hardness, it is preferable that the resin other than the thermoplastic resin A be contained in a total of 5% by mass to 40% by mass in 100% by mass of the resin, and 10% by mass to 40% by mass. %, More preferably 20% by mass or more and 40% by mass or less.

(Foaming agent)
The film of the present invention is characterized in that the compression work, the coefficient of friction, the variation of the surface roughness (SMD), the variation of the coefficient of friction (MMD), the feeling of cold and warm contact (Qmax), and the hardness of the shear are in the above-mentioned preferred ranges. And a composition containing a foaming agent. That is, the film of the present invention is preferably obtained by foaming using a foaming agent in the composition to form pores in the film.

  The foaming agent here is not particularly limited as long as it can be used for foaming the film to form pores, and a chemical foaming agent, a physical foaming agent, or the like can be used. However, it is preferable to use a chemical foaming agent in consideration of film forming easiness and film forming stability. Examples of the chemical foaming agent include sodium hydrogen carbonate, sodium carbonate, ammonium hydrogen carbonate, ammonium carbonate, ammonium nitrite, N, N'-dimethyl-N, N'-dinitrosoterephthalamide, N, N'-dinitrosopentamethylenetetramine Nitroso compounds such as azodicarbonamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiamininobenzene, azo compounds such as barium azodicarboxylate, benzenesulfonylhydrazide, toluenesulfonylhydrazide, p, p'-oxybis (Benzenesulfonylhydrazide), sulfonylhydrazide compounds such as diphenylsulfone-3,3′-disulfonylhydrazide, calcium azide, 4,4′-diphenyldisulfonylazide, p-toluenes Honiruajido the like can be used azide compound such as economy, availability, in terms of film stability, it is more preferable to use sodium hydrogen carbonate. The chemical foaming agent may be one kind or plural kinds, and may further contain an organic acid such as salicylic acid, phthalic acid, oxalic acid, zinc oxide, zinc stearate and the like as a foaming aid.

  The content of the foaming agent is not particularly limited as long as the effects of the present invention are not impaired, but the work of compression, the coefficient of friction, the variation of the surface roughness (SMD), the variation of the coefficient of friction (MMD), and the feeling of cold and warm contact (Qmax) From the viewpoint of further improving the shear hardness, the foaming agent is preferably 0.05 to 20 parts by mass, based on 100 parts by mass of the entire resin in the composition used to obtain the film. It is more preferably 1 part by mass or more and 10 parts by mass or less, further preferably 0.2 parts by mass or more and 5 parts by mass or less, particularly preferably 0.3 parts by mass or more and 3 parts by mass or less. It is most preferable that the amount be from 4 parts by mass to 2 parts by mass.

(Porosity of film)
The film of the present invention preferably has pores. The porosity of the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired, but the work of compression, the coefficient of friction, the variation in surface roughness (SMD), the variation in the coefficient of friction (MMD), It is preferable that it is 20% or more and 90% or less from the viewpoint of setting the contact cold / hot feeling (Qmax) and the shear hardness to the above-mentioned preferable ranges.

  The porosity of the film is at least 25% from the viewpoint of further improving the work of compression, the coefficient of friction, the variation of the surface roughness (SMD), the variation of the coefficient of friction (MMD), the feeling of cold contact (Qmax), and the hardness of the shear. It is more preferably 90% or less, more preferably 40% or more and 90% or less, more preferably 50% or more and 90% or less, even more preferably 60% or more and 90% or less, It is particularly preferably from 70% to 90%, and most preferably from 80% to 90%.

  The method for setting the porosity of the film to 20% or more and 90% or less, or the above preferable range is not particularly limited, but examples include the following methods. The above-mentioned thermoplastic resin A, a resin other than the thermoplastic resin A, a foaming agent and the like are blended in the above-mentioned preferred types and ratios, and a composition to which a filler described below is added, and a non-stretched film is produced by a production method described below. The porosity of the film can be adjusted to the above-mentioned preferable range by a method of manufacturing, stretching in at least one axial direction, and rubbing under preferable conditions.

(filler)
The film of the present invention is filled from the viewpoint that the compression work, the coefficient of friction, the variation of the surface roughness (SMD), the variation of the coefficient of friction (MMD), the feeling of contact cold and warm (Qmax), and the hardness of the shear are within the above-mentioned preferred ranges. It is preferable to contain an agent. As the filler, an inorganic filler and / or an organic filler can be used, but from the above viewpoint, it is more preferable to use an acicular filler having a high aspect ratio. Examples of the needle-like filler include artificial mineral fibers such as rock wool, glass fiber, and slag wool, natural mineral fibers such as wollastonite and sepiolite, crushed waste paper, crushed clothing, cotton fiber, hemp fiber, bamboo fiber, and the like. Plant fibers such as wood fiber, kenaf fiber, jute fiber, banana fiber and coconut fiber; animal fibers such as silk, wool, angora, cashmere, and camel; and synthetic fibers such as polyester fiber, nylon fiber, and acrylic fiber. Can be used alone or in combination of two or more. Among them, it is particularly preferable to use rock wool from the viewpoints of economy, availability, and film formation stability.

  The aspect ratio of the acicular filler is not particularly limited as long as the effects of the present invention are not impaired. However, when the aspect ratio of the acicular filler is 5 or more, the filler can be highly filled in the film, so that the work of compression, the coefficient of friction, the variation in surface roughness (SMD), Fluctuations in the coefficient of friction (MMD) and the feeling of cold and warm contact (Qmax) can be within the preferred ranges. When the molecular weight is 50,000 or less, the film-forming stability is improved, and thus the needle-like filling is achieved. The aspect ratio of the agent is preferably 5 or more and 50,000 or less. From the same viewpoint, the aspect ratio of the acicular filler is more preferably 10 or more and 10,000 or less, further preferably 15 or more and 5,000 or less, and 20 or more and 1,000 or less. Is most preferred.

  Here, the aspect ratio of the acicular filler is an average major axis / average minor axis of the acicular filler. Here, the major axis refers to the length when any two points on the outer contour line of the filler are selected so that the length between them is maximized, and the minor axis refers to the length on the outer contour line of the filler. The length when any two points are selected so that the length between them is the shortest. The average major axis refers to the average value of the major axes of 100 needle-shaped fillers measured using a scanning electron microscope, and the average minor axis refers to 100 needle-shaped fillers measured using a scanning electron microscope. Mean of the minor axis of the filler.

  The content of the filler is not particularly limited as long as the effects of the present invention are not impaired. However, the content of the filler is such that the compression work amount, the coefficient of friction, the variation of the surface roughness (SMD), the variation of the friction coefficient (MMD), the feeling of cold and warm contact (Qmax), and the hardness of the shear are within the above-mentioned preferred ranges. Therefore, the content of the filler 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, with respect to 100 parts by mass of the whole resin in the film, and more preferably 25 parts by mass or less. It is particularly preferable that the amount be from 50 parts by mass to 50 parts by mass.

(Film thickness)
The thickness of the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired, but is preferably 3 μm or more and 200 μm or less. By setting the thickness to 3 μm or more, the stiffness of the film becomes strong, the handleability is excellent, and the roll appearance and unwinding property are good. By setting the thickness to 200 μm or less, particularly in the inflation film forming method, the bubble is stabilized by its own weight. The thickness of the film of the present invention is more preferably 7 μm or more and 150 μm or less, further preferably 10 μm or more and 100 μm or less, and still more preferably 12 μm or more and 50 μm. The thickness of the film can be measured by a method described later.

(Moisture permeability of film)
When the film of the present invention is used for applications requiring moisture permeability such as a sanitary material, the moisture permeability is preferably 500 g / (m ² · day) or more, and 700 g / (m ² · day). It is more preferably at least 1,000 g / (m ² · day), more preferably at least 1,500 g / (m ² · day), and 2,500 g / (m more preferably ² · day) or more, still more preferably 3,500g ^/ (m 2 · day) or more, particularly preferably at 4,200g ^/ (m 2 · day) or more, 6, Most preferably, it is not less than 000 g / (m ² · day). The moisture permeability of the film can be measured by a method described later.

  The method for adjusting the moisture permeability to the above preferable range is not particularly limited as long as the effects of the present invention are not impaired, but, for example, blasting or rubbing is performed on the surface of a film manufactured by a manufacturing method described below. Is mentioned.

The higher the moisture permeability of the film is, the more preferable the upper limit is. However, from the viewpoint of application to sanitary materials, it is considered that the upper limit is about 8,000 g / (m ² · day).

(Elongation at break in the machine direction of the film)
The film of the present invention preferably has an elongation at break in the machine direction of 10% or more from the viewpoints of windability, handleability, and suitability for post-processing.

  Although the upper limit of the elongation at break in the machine direction is not particularly limited, the upper limit is 1000% for practical manufacturability.

  The method of setting the elongation at break in the machine direction of the film of the present invention to 10% or more is not particularly limited as long as the effects of the film of the present invention are not impaired. Processing or rubbing may be performed.

(Additive)
The film of the present invention may contain components other than the components described above as long as the effects of the present invention are not impaired. For example, antioxidants, ultraviolet stabilizers, color inhibitors, matting agents, antibacterial agents, deodorants, weathering agents, antioxidants, ion exchangers, tackifiers, coloring pigments, dyes, and the like can be used. .

(Layer composition of film)
The layer configuration of the film of the present invention is not particularly limited as long as the effects of the present invention are not impaired. That is, the film of the present invention, even in a single-layer configuration, a thermoplastic resin A, a thermoplastic resin other than the thermoplastic resin A, a foaming agent, a film made of a composition in which the type and ratio of fillers and the like are changed. Alternatively, a film composed of polylactic acid, polyethylene terephthalate, polyethylene naphthalate, aramid, polyethylene sulfide, polyphenylene sulfide, polyimide, polyethylene imine, polysulfone, polyether ether ketone, polyolefin, or the like may be laminated to form a laminated structure. However, from the viewpoint of economy, film forming easiness, and film forming stability, a single layer structure is preferable.

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

  In order to obtain a composition used to obtain the film of the present invention, that is, a composition containing thermoplastic resin A, a thermoplastic resin other than thermoplastic resin A, a foaming agent, a filler, and the like, each component is melt-kneaded. The melt-kneading method for producing the composition by the above-mentioned process is preferable. The melt-kneading method is not particularly limited, and a known mixer such as a kneader, a roll mill, a Banbury mixer, a single-screw or twin-screw extruder can be used. Among them, use of a single-screw or twin-screw extruder is preferred from the viewpoint of productivity.

  The film of the present invention can be produced by a known film production method such as a known inflation method, a tubular method, or a T-die casting method, using the composition obtained by the above method. Further, the obtained unstretched film may be uniaxially or biaxially stretched for the purpose of improving mechanical properties, weight reduction, and moisture permeability.

  For the stretching, a roll method or a tenter method is used. The stretching of the unstretched film is preferably performed at least in a uniaxial direction by 1.1 times or more, more preferably by 1.5 times or more and 8 times or less. From the viewpoint of economy and productivity, it is preferable that the film is uniaxially stretched 1.1 times or more only in the machine direction, not the biaxial direction, and more preferably 1.5 times or more and 8 times or less. Here, the machine direction refers to the direction in which the film advances during film production.

  After the film is formed, various surface treatments may be applied for the purpose of improving printability, suitability for lamination, suitability for coating, and the like. Examples of the surface treatment include corona discharge treatment, plasma treatment, flame treatment, and acid treatment. Either method can be used, but corona discharge treatment is most preferable because continuous treatment is possible, and equipment can be easily installed in existing film-forming equipment and treatment can be simplified.

  In the method for producing a film of the present invention, the composition used to obtain the film in the production process can be foamed to form pores in the film. By adding the foaming agent of the type and amount described in the section of “Blowing agent” to the composition used to obtain the film and foaming the film, it is possible to easily form pores in the film. The film thus obtained has a favorable compression work, a coefficient of friction, a variation in surface roughness (SMD), a variation in coefficient of friction (MMD), a sense of cold and warm contact (Qmax), and a firmness in shear.

  Further, the method for producing a film of the present invention preferably includes a step of performing a rubbing process on the film. By subjecting the film to a rubbing process, the preferable compression work amount, friction coefficient, variation in surface roughness (SMD), variation in friction coefficient (MMD), contact cold / hot sensation (Qmax), and shear hardness are adjusted to preferred ranges. be able to.

  Subsequently, a method of performing a rubbing process is described below.

  The film of the present invention can be obtained by subjecting the film formed by the method described above to a rubbing process to make the film fluffy. The rubbing process is performed by pressing a rubbing roller with a rubbing cloth wound around the film by a known rubbing device, and relatively moving the film while rotating the rubbing roller. The number of times of rubbing is not particularly limited, and may be one, or two or more as needed.

  The strength of the rubbing can be appropriately changed according to the length of the rubbing cloth touching the film surface, the number of rotations of the rubbing roller, the moving speed of the film, the temperature of the film surface, and the like. In addition, from the viewpoint of preventing dust and the like from adhering to the film, it is preferable to perform charge removal by a charge remover after rubbing. When the surface temperature of the film is changed, a table-type rubbing device can be used by mounting a hot plate on a stage and heating the film from below. In the case of continuously rubbing a roll-shaped film, the film is pre-heated by a continuous roll group, and then is brought into contact with the running film while rotating a rubbing roller wound with a rubbing cloth. It can be carried out.

  As a guide for rubbing conditions, it is preferable to perform rubbing under such a condition that the rubbing distance (mm) represented by the following formula M is 500 mm or more.

M = NL (2πRn / 60V ± 1)
N in the above formula is the number of rubbings, L is the length (mm) of the rubbing cloth touching the film surface, R is the radius of the rubbing roller including the thickness of the rubbing cloth (mm), n is the number of rotations (rpm) of the rubbing roller, and V is the moving speed (mm / s) of the film. The sign of ± in the formula M is calculated as + when the rubbing roller is rotated in a direction opposite to the moving direction of the film, and as − when the rubbing roller is rotated in the same direction. As the rubbing cloth, a cloth file having a count of # 30 to $ 2,000 is preferable.

(Other applications, etc.)
The film of the present invention thus obtained has the mechanical properties necessary for use as a film, and has a cushioning property like a cloth, and has a pleasant tactile sensation. it can. Furthermore, the film of the present invention can be a laminate with a nonwoven fabric. Further, the sanitary material of the present invention refers to a sanitary material including the film of the present invention.

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

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

(1) Thickness of Film A sample was cut out from the center in the width direction of the film. Using an ultramicrotome, an ultrathin section was collected at -100 ° C so that a cross section in the machine direction-thickness direction of the sample piece was used as an observation surface. Using a scanning electron microscope (S-3400N, manufactured by Hitachi High-Technologies Corporation), a photograph of the thin film section of the film cross section was taken at a magnification of 1000 times (magnification can be adjusted appropriately), and the thickness was measured. . The same measurement was performed at 10 different observation points, and the average of the obtained values was defined as the film thickness (μm).

  Note that the width direction refers to a direction parallel to the transport plane of the film and orthogonal to the machine direction, and the thickness direction refers to a direction perpendicular to both the machine direction and the width direction.

(2) Porosity of film (%)
The film was cut into a size of 30 mm × 40 mm to obtain a sample. Using an electronic hydrometer (SD-120L manufactured by Mirage Trading Co., Ltd.), the specific gravity of the sample was measured in an atmosphere at a room temperature of 23 ° C. and a relative humidity of 65%. The measurement was performed three times, and the average value of the obtained values was defined as the specific gravity (ρ) of the film.

Next, the measured film was hot-pressed at 280 ° C. and 5 MPa, and then quenched with water at 25 ° C. to form a non-porous sheet. The specific gravity of the non-porous sheet was measured in the same manner as described above, and the average of the obtained values was defined as the specific gravity (d) of the resin. From the specific gravity (ρ) of the film and the specific gravity (d) of the resin, the porosity of the film was calculated by the following equation.
Porosity (%) of film = [(d−ρ) / d] × 100
(3) Variation in film surface roughness (SMD)
The film was cut into a sample having a size of 12 cm (longitudinal direction) × 12 cm (width direction), and was attached to a test table such that the outer surface of the roll became a measurement surface. Then, using a surface property tester KES-SE-SR-U manufactured by Kato Tech Co., Ltd., slide on the measurement surface under a load of 5 gf and a speed of 1 mm / sec in an atmosphere of room temperature 23 ° C. and relative humidity 65%. The film was moved in parallel with the longitudinal direction of the film, and the change in surface roughness in the longitudinal direction of the film was measured. Thereafter, the slider was similarly moved in a direction parallel to the film width direction, and a change in surface roughness in the film width direction was measured. Fluctuations in surface roughness in the longitudinal direction and width direction of the film were measured three times, respectively, and the average value of the absolute values of all the values was defined as the fluctuation in surface roughness (SMD) (μm) of the film. Note that a piano wire having a length of 5 mm and a diameter of 0.5 mm was used as the slide.

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

(5) Contact cold / hot feeling (Qmax) of film
Using a thermolab KES-F7II manufactured by Kato Tech Co., the contact cold / hot feeling (Qmax) of the film was measured under the conditions of room temperature of 23 ° C. and relative humidity of 65%. Thermolab 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 mounted on 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 such 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 provided with the film was brought into contact with the detector 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 value of the obtained values was defined as the contact cold / hot feeling (Qmax) of the film.

(6) The moisture permeability of the film was measured using a thermo-hygrostat set at 25 ° C. and 90% RH according to the method specified in JIS Z0208 (1976). The measurement was performed three times, and the average of the obtained values was defined as the moisture permeability of the film (g / (m ² · day)). The moisture permeability of the film may be measured from either side of the film.

(7) Elongation at break of machine direction of film (%)
The stress-strain at 23 ° C. was measured using TENSILON (registered trademark) UCT-100 manufactured by Orientec equipped with a thermostat, and the elongation at break in the machine direction of the film at 23 ° C. was measured.

  Specifically, a strip-shaped film sample was cut out so that the length in the machine direction was 150 mm and the length in the width direction was 10 mm, and the initial tension chuck was placed in a constant temperature bath adjusted to 23 ° C. The elongation at break in the machine direction of the film was measured according to the method specified in JIS K-7127 (1999) at a distance of 50 mm and a tensile speed of 200 mm / min. The measurement was performed 10 times, and the average of the obtained values was defined as the elongation at break (%) in the machine direction of the film.

(8) Coefficient of friction of film Using a surface property tester KES-SE manufactured by Kato Tech Co., Ltd., the film is cut into a sample of 5 cm (machine direction) × 10 cm (width direction), attached to a test table, A standard friction element (fingerprint type) was attached as a slide element, and the slide element was moved on the surface of the sample at a load of 12 gf and at a speed of 1 mm / sec. Was measured for friction coefficient. The measurement was performed three times in each of the machine direction and the width direction (six times in total), and the average value of all the data was defined as the friction coefficient of the film.

(9) Shear Hardness of Film Using a shear tester KES-FB1 manufactured by Kato Tech Co., Ltd., the film was cut into a sample having a size of 20 cm (machine direction) × 20 cm (width direction), attached to a test table, and placed at room temperature. The shear hardness (gf / (cm · deg)) of the film was measured under the conditions of an atmosphere of 23 ° C. and a relative humidity of 65%. The measurement was performed three times in each of the machine direction and the width direction (a total of six times), and the average value of all the data was defined as the shear hardness of the film.

(10) Film compression work The film was cut into a size of 20 cm (machine direction) x 20 cm (width direction) using an automated compression tester KES-FB3-AUTO-A manufactured by Kato Tech Co., Ltd., and tested. The sample was mounted on a table, and the sample was filmed between steel plates having a circular flat surface of 2 cm ² in area under the conditions of compression speed: 150 sec / mm, maximum compression load: 10 gf / cm ² , room temperature 23 ° C., and relative humidity 65%. Was measured for compression work (gf · cm / cm ² ). The measurement was performed three times for each of the inner and outer surfaces of the film (total of six times), and the average value of all data was taken as the compression work of the film.

(11) Evaluation of the shear deformation of the film A tentacle test was carried out on 30 randomly selected subjects, and the number of respondents who had a shear deformation like a cloth determined the shear deformation of the film as follows. Was evaluated as follows. The shear deformation of 10 is the most excellent.
10: 26 or more people answered that they have shear deformation like cloth 9: 24 or more and 25 or less who answered that they have shear deformation like cloth 8: Cloth 22 or more and 23 or less who answered that they have shear deformation like 7: 20 or more and 21 or less who answered that they have shear deformation like cloth 6: cloth 18 or more and 19 or less who answered that it has shear deformation like 5: 16 or more and 17 or less who answered that it has shear deformation like cloth 4: cloth 14 or more and 15 or less who answered that it has shear deformation such as 3: 3: 12 or more and 13 or less who answered that it has shear deformation like cloth 2: cloth 10 or more and 11 or less who answered that they have shear deformation like that of 1: 1: Shear deformation like cloth 9 or less respondents who have a tentacle test (12) Evaluation of the cushioning property of the film A tentacle test was conducted on 30 arbitrarily selected persons, and the number of respondents who had a cushioning property like a cloth The cushioning property of the film was evaluated as follows. The cushioning property of 10 is the best, but if it is 2 or more, it can be practically used as a film having a cushioning property like cloth.
10: 26 or more respondents who have cushioning properties like cloth 9: 24 to 25 or less responding that they have cushioning properties like cloth 8: Like cloth 22 or more and 23 or less who answered that they had a good cushioning property 7: 20 or more and 21 or less who answered that they had a cloth-like cushioning property 6: A cloth-like cushion 18 or more and 19 or less who answered that they had the property 5: 16 or more and 17 or less who answered that they had the cloth-like cushioning property 4: The cloth-like cushioning property 14 or more and 15 or less 3: cloth-like cushioning property 12 or more and 13 or less 2: cloth-like cushioning property 10 or more and 11 or less 1: Cushion like cloth 9 or less persons who answered that the sample had (13) DSC measurement polylactic acid sample was heated in a hot air oven at 100 ° C. for 24 hours, and then 5 mg of the sample was set in an aluminum saucer, and the Seiko Instruments Inc. The presence or absence of a crystal melting peak when the sample was heated from 25 ° C. to 250 ° C. at a heating rate of 20 ° C./min was measured using a differential scanning calorimeter RDC220 manufactured by KK. When no crystal melting peak was observed, the sample was defined as amorphous polylactic acid.

[Thermoplastic resin A]
(A1)
Ethylene-methyl methacrylate copolymer (trade name: ACLIFT WH303, manufactured by Sumitomo Chemical Co., Ltd.)
[Resins other than thermoplastic resin A]
(B1)
Ethylene resin (trade name: NUC8506, manufactured by Nippon Unicar Co., Ltd.)
(B2)
Amorphous polylactic acid (trade name: Ingeo (registered trademark) 4060D, manufactured by Nature Works).

[Blowing agent (C)]
(C1)
Sodium hydrogen carbonate (trade name: Cerbon FE-507, manufactured by Eiwa Chemical Co., Ltd.)
[Filler (D)]
(D1)
Rock wool (trade name: RW-150, aspect ratio 40, manufactured by TDI Corporation)
[Preparation of film]
(Example 1)
A1 and C1 were supplied to a twin-screw extruder equipped with a vacuum vent having a screw diameter of 44 mm at a cylinder temperature of 145 ° C. and melt-kneaded with the contents shown in Table 1, 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 vacuum-dried pellets of the composition were fed to a single screw extruder having a screw diameter of 60 mm at a cylinder temperature of 180 ° C. by an inflation method, a diameter of 250 mm, a lip clearance of 1.0 mm, and a circular die set at a temperature of 165 ° C. The resin 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 up in a roll shape. By adjusting the take-off speed, a film having a thickness of 30 μm was obtained.

  Next, the outer surface of the wound film was rubbed uniformly using a rubbing apparatus (NR-10 Type3) manufactured by Newtom Corporation equipped with a hot stage. The temperature of the stage is set to 45 ° C., and the rubbing cloth is a cloth file (polishing cloth # 400 manufactured by Riken Corundum Co., Ltd.), and the rubbing distance represented by the above formula M is 600 mm, that is, the film surface The length L of the rubbing cloth being touched is set to 10 mm, the radius R of the rubbing roller including the rubbing cloth thickness is set to 45 mm, the rotation speed n of the rubbing roller is set to 720 rpm, and the moving speed V of the film is set to 120 mm / s. Was rubbed twice while rotating in a direction opposite to the moving direction of the film. The same rubbing process was performed twice on the other inner surface of the roll. Table 1 shows the physical properties and evaluation results of the obtained film.

(Examples 2 to 13, Examples 17 to 19, Comparative Examples 1 and 5)
As described in Table 1, 2 or 3, except that the type and content of the resin, the content of the foaming agent, and the content of the filler were changed, a 30 μm thick film was obtained by the inflation method in the same manner as in Example 1. A film was obtained. Next, the obtained film was subjected to a rubbing process in the same manner as in Example 1. The physical properties and evaluation results of the obtained film are shown in Table 1, 2 or 3.

(Examples 14 to 16)
As described in Table 2, a film having a thickness of 120 μm was obtained by the inflation method in the same manner as in Example 1 except that the type and content of the resin, the content of the foaming agent, and the content of the filler were changed. Was.

  The obtained film was stretched 4 times in the machine direction at a film temperature of 60 ° C. by a roll stretching machine. Subsequently, the film was heat-treated at a film temperature of 70 ° C. for 1 second on a heating roll under a constant length, and then cooled on a cooling roll to obtain a film having a thickness of 30 μm.

  Next, the obtained film was subjected to a rubbing process in the same manner as in Example 1. Table 2 shows the physical properties and evaluation results of the obtained film.

(Comparative Examples 2 to 4, 6 to 8)
As described in Table 3, a 30 μm thick film was obtained by the inflation method in the same manner as in Example 1 except that the type and content of the resin, the content of the foaming agent, and the content of the filler were changed. Was. No rubbing was performed on Comparative Examples 2 to 4 and 6 to 8. Table 3 shows the physical properties and evaluation results of the obtained film.

In the table, "% by mass" of the item of "Thermoplastic resin A" and "% by mass" of the item of "Resin other than the thermoplastic resin A" were calculated as values when the whole resin was 100% by mass.
In the table, "parts by mass" of the item "foaming agent" and "parts by mass" of the item of "filler" were calculated as values when the whole resin was taken as 100 parts by mass.

  By using the film of the present invention, it is possible to provide a high-quality film mainly in a use having a cushioning property like a cloth and requiring a comfortable tactile sensation. The film of the present invention is specifically used for medical / sanitary materials such as bed sheets, pillow covers, backsheets for absorbent articles such as sanitary napkins and disposable diapers, clothing materials such as rainy clothing, gloves, garbage bags and compost. For packaging materials such as bags, food bags such as vegetables and fruits, bags for various industrial products, building materials such as buildings, houses, decorative boards, interior materials in transport vehicles such as railway vehicles, ships, and aircraft, and building materials. It can be preferably used.

Claims (14)

When the compression work measured according to the KES method is 0.015 gf · cm / cm ² or more and 1.0 gf · cm / cm ² or less, and the friction coefficient measured according to the KES method is 0.05 or more and 0.7 or less. A film, characterized in that there is. ^2. The film according to claim 1, wherein the compression work amount is 0.05 gf · cm / cm ² or more and 0.4 gf · cm / cm ² or less.   On at least one surface, the variation in surface roughness (SMD) measured according to the KES method is from 1.2 μm to 16 μm, and the variation in friction coefficient (MMD) is from 0.003 to 0.07. The film according to claim 1, wherein: Contact cold feeling as measured according to KES method (Qmax), characterized in that at 0.02 W / cm ² or more 0.45 W / cm ² or less, the film according to claim 1.   The film according to any one of claims 1 to 4, wherein the coefficient of friction is 0.41 or more and 0.65 or less.   The film according to any one of claims 1 to 5, wherein a shear hardness measured according to the KES method is 0.1 gf / (cm · deg) or more and 6 gf / (cm · deg) or less.   At least one resin selected from the group consisting of ethylene-methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer and ethylene-methacrylic acid copolymer The film according to any one of claims 1 to 6, comprising:   The film according to any one of claims 1 to 7, wherein the porosity is 20% or more and 90% or less.   The film according to claim 1, wherein the film is obtained from a composition containing a blowing agent.   The film according to any one of claims 1 to 9, wherein the film has a single-layer structure.   The film according to claim 1, wherein the film is a sanitary material film.   A laminate of the film according to claim 1 and a nonwoven fabric.   The method for producing a film according to any one of claims 1 to 11, wherein the composition used for obtaining the film in the production process is foamed to form pores in the film. Production method.   The method for producing a film according to any one of claims 1 to 11, further comprising a step of rubbing the film.