Layered body and layered body manufacturing method

Abstract

This layered body comprises a porous layer and a first release liner. The porous layer includes a silicone resin. The first release liner is disposed on one main surface of the porous layer. The first release liner has a surface free energy of 30 mJ / m2 or greater.

Description

Laminate and method for manufacturing a laminate

[0001] This invention relates to a laminate and a method for manufacturing a laminate.

[0002] Conventionally, porous polymer films containing fluororesins are known.

[0003] For example, Patent Document 1 describes an aggregate comprising a polymer membrane containing stretched polytetrafluoroethylene (ePTFE) and at least one support structure. This polymer membrane has a Young's modulus in the range of 1 MPa to 1000 MPa.

[0004] Japanese Patent Publication No. 2023-109841

[0005] The polymer film described in Patent Document 1 has room for reconsideration from the viewpoint of reducing the fluororesin content in a porous film containing resin. Therefore, the present invention provides a laminate having a porous layer that is advantageous from this viewpoint.

[0006] The present invention comprises a porous layer containing a silicone resin, and a first peel liner disposed on one main surface of the porous layer, wherein the first peel liner has a conductivity of 30 mJ / m 2 The present invention provides a laminate having the above surface free energy.

[0007] Furthermore, the present invention comprises a precursor layer of a porous layer containing a silicone resin, a first peel liner disposed on one main surface of the precursor layer, and a second peel liner disposed on the other main surface of the precursor layer, wherein the precursor layer contains water in the spaces corresponding to the pores of the porous layer, and the first peel liner and the second peel liner have a water content of 30 mJ / m 2The present invention provides a laminate having the above surface free energy, wherein the first peel force is greater than the second peel force, the first peel force is the peel force when peeling the first non-porous layer containing the silicone resin in a first non-porous layer obtained by forming the first non-porous layer on the first non-porous layer on the first non-porous layer on the first non-porous layer on the second

[0008] Furthermore, the present invention relates to a method for manufacturing the above-mentioned laminate, comprising: heating a liquid film of a W / O emulsion having a continuous phase containing a silicone resin and a dispersed phase containing water, with the liquid film formed between the first peel liner and the second peel liner, thereby solidifying the continuous phase and forming a precursor layer of the porous layer, wherein the second peel liner has a viscosity of 30 mJ / m 2 A method for manufacturing a laminate having the above surface free energy.

[0009] Furthermore, the present invention provides a laminate comprising a porous layer containing a silicone resin and an adhesive layer disposed on a part of one main surface of the porous layer, wherein the air permeability resistance (Wangyan) of the porous layer, measured according to Japanese Industrial Standard (JIS) P8117:2009, is 300 seconds or less, and the opening ratio on the surface of the porous layer is 1% or more.

[0010] The above-described laminate is advantageous in that it reduces the fluororesin content in a porous film containing resin.

[0011] Figure 1 is a schematic cross-sectional view showing an example of a laminate according to the present invention. Figure 2 is a schematic plan view showing another example of a laminate according to the present invention. Figure 3 is a schematic cross-sectional view of a laminate with line III-III in Figure 2 as the cutting line. Figure 4 is a schematic cross-sectional view showing yet another example of a laminate according to the present invention. Figure 5 is a schematic cross-sectional view showing yet another example of a laminate according to the present invention. Figure 6 is a schematic diagram showing an example of a method for manufacturing a laminate according to the present invention.

[0012] Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

[0013] Figure 1 is a schematic cross-sectional view showing an example of a laminate according to the present invention. As shown in Figure 1, the laminate 1a comprises a porous layer 10 and a first release liner 21. The porous layer 10 contains silicone resin. Therefore, the fluororesin content can be reduced compared to a porous film obtained by stretching fluororesin. The first release liner 21 is arranged on one main surface of the porous layer 10. The first release liner 21 has a viscosity of 30 mJ / m 2 The porous layer 10 has the above surface free energy. This makes it easier for openings to form on the surface of the porous layer 10 in contact with the first peel liner 21, and the porous layer 10 is more likely to have the desired properties. The porous layer 10 may have properties equivalent to or better than those of a porous film obtained by stretching a fluororesin, for example, with respect to a predetermined property. For this reason, the porous layer 10 can be used in applications including conventional applications in which porous films obtained by stretching a fluororesin are used. For example, the porous layer 10 is more likely to have desired air permeability, sound permeability, dustproofness, or water vapor permeability. The surface free energy of the first peel liner 21 is the value at 25°C and can be determined, for example, according to the method described in the examples.

[0014] The surface free energy of the first peeling liner 21 is preferably 32 mJ / m 2 The above applies, and more preferably 35 mJ / m 2 That concludes the explanation. The surface free energy of the first peeling liner 21 is, for example, 75 mJ / m 2 The following is true: 70 mJ / m 2not more than 65 mJ / m 2 may be not more than the above value.

[0015] The material forming the first release liner 21 is not limited to any specific material as long as the surface free energy of the first release liner 21 is 30 mJ / m 2 . The first release liner 21 contains, for example, a polyester resin such as polyethylene terephthalate (PET).

[0016] As shown in FIG. 1, the porous layer 10 has pores 12. The porous layer 10 has, for example, an open-cell porous structure in which the pores 12 are interconnected with each other.

[0017] The porous layer 10 has, for example, predetermined air permeability. The air resistance (Oken type) of the porous layer 10 measured in accordance with JIS P8117:2009 is, for example, 300 seconds or less. In this case, the porous layer 10 can be used in applications that require air permeability.

[0018] The air resistance (Oken type) of the porous layer 10 is desirably 200 seconds or less, more desirably 100 seconds or less, and still more desirably 50 seconds or less. The air resistance (Oken type) of the porous layer 10 may be 40 seconds or less, 30 seconds or less, 20 seconds or less, 10 seconds or less, 5 seconds or less, or 3 seconds or less. The air resistance (Oken type) of the porous layer 10 is, for example, 0.1 seconds or more, and may be 0.5 seconds or more, or 1 second or more.

[0019] The aperture ratio on the surface of the porous layer 10 is, for example, 1% or more. In this case, the porous layer 10 tends to have desired air permeability. The aperture ratio on the surface of the porous layer 10 can be determined, for example, according to the method described in the Examples.

[0020] The aperture ratio on the surface of the porous layer 10 is desirably 2% or more, and may be 5% or more or 10% or more. The aperture ratio on the surface of the porous layer 10 is, for example, 50% or less, and may be 45% or less or 40% or less.

[0021] The thickness of the porous layer 10 is not limited to a specific value. For example, the thickness of the porous layer 10 is 10 μm or more. In this case, the porous layer 10 is easier to handle. The thickness of the porous layer 10 may be 20 μm or more, 30 μm or more, or 40 μm or more. For example, the thickness of the porous layer 10 is 100 μm or less.

[0022] The thickness of the first peel-off liner 21 is not limited to a specific value. The thickness of the first peel-off liner 21 is, for example, 30 μm or more. In this case, the first peel-off liner 21 is easier to handle. The thickness of the first peel-off liner 21 may be 40 μm or more, 50 μm or more, or 60 μm or more. The thickness of the first peel-off liner 21 is, for example, 100 μm or less.

[0023] The silicone resin contained in the porous layer 10 is not limited to a specific silicone resin. The silicone resin may be derived, for example, from a condensation-type silicone resin composition or an addition-type silicone resin composition. An addition-type silicone resin composition is a type of silicone resin composition that hardens by an addition reaction. A condensation-type silicone resin composition is a type of silicone resin composition that hardens by a condensation reaction.

[0024] Figure 2 is a schematic plan view showing another example of the laminate according to the present invention. Figure 3 is a schematic cross-sectional view of the laminate with line III-III in Figure 2 as the cutting line. As shown in Figures 2 and 3, a laminate 1b having an adhesive layer can be provided using the laminate 1a. The laminate 1b includes an adhesive layer 30 disposed on a part of the other main surface of the porous layer 10. With this configuration, the laminate 1b can be attached to a predetermined article by pressing the adhesive layer 30 against that article. In addition, the porous layer 10 is protected by the first release liner 21. The first release liner 21 may be peeled off from the laminate 1b before the laminate 1b is attached to the predetermined article, or it may be peeled off from the laminate 1b after the laminate 1b is attached to the predetermined article.

[0025] The adhesive strength of the adhesive layer 30 is not limited to a specific value. The adhesive layer 30 may have an adhesive strength of, for example, 0.1 N / 20 mm to 20 N / 20 mm. In this case, the laminate including the porous layer 10 and the adhesive layer 30 can be easily peeled off from the adherend without the adhesive layer 30 peeling off from the porous layer 10. From this viewpoint, the adhesive strength of the adhesive layer 30 is preferably 0.3 N / 20 mm to 15 N / 20 mm, and more preferably 0.5 N / 20 mm to 10 N / 20 mm. The adhesive strength of the adhesive layer 30 may be measured, for example, as a 180° peel adhesive strength, according to JIS Z 0237:2009. In this case, the adhesive layer 30 may be backed with a PET film or the like as needed.

[0026] The shape of the laminate 1b in plan view is not limited to a specific shape; as shown in Figure 1, the laminate 1b is, for example, circular in plan view. The laminate 1b may also be elliptical, triangular, quadrilateral, other polygonal, or irregular in shape in plan view.

[0027] As shown in Figure 2, the adhesive layer 30 is formed, for example, in an annular shape in a plan view. The adhesive layer 30 is formed, for example, to cover the peripheral edge of the other main surface of the porous layer 10.

[0028] The adhesive layer 30 includes, for example, an acrylic adhesive, a urethane adhesive, or a silicone adhesive. Preferably, the adhesive layer 30 may also include a silicone adhesive or a heat-resistant acrylic adhesive. In this case, the adhesive layer 30 is more likely to maintain its tackiness even when the laminate 1b is used in a reflow process or the like. In the reflow process, the laminate 1b is placed in an environment of 240°C for 5 minutes, for example.

[0029] Figure 4 is a schematic cross-sectional view showing yet another example of a laminate according to the present invention. Laminate 1c shown in Figure 4 is configured similarly to laminate 1b, except for parts that are not specifically described. Components of laminate 1c that are the same as or correspond to components of laminate 1b are denoted by the same reference numerals, and detailed descriptions are omitted. The descriptions of laminates 1a and 1b also apply to laminate 1c, unless otherwise technically contradictory.

[0030] As shown in Figure 4, the laminate 1c comprises a porous layer 10 and an adhesive layer 30. The adhesive layer 30 is positioned on a portion of one main surface of the porous layer 10. In the laminate 1c, the air permeability resistance (Wangyan) of the porous layer 10, measured according to JIS P8117:2009, is 300 seconds or less. In addition, the opening ratio on the surface of the porous layer 10 is 1% or more. With this configuration, the laminate 1c can be attached to a predetermined article by pressing the adhesive layer 30 against that article. Furthermore, the laminate 1c is attached to the article while air permeability is ensured by the porous layer 10. The laminate 1c may also include another adhesive layer positioned on a portion of the other main surface of the porous layer 10.

[0031] Figure 5 is a schematic cross-sectional view showing yet another example of a laminate according to the present invention. As shown in Figure 5, the laminate 1d comprises a precursor layer 15, a first peel liner 21, and a second peel liner 22. The precursor layer 15 is a precursor layer of a porous layer containing a silicone resin, for example, a precursor layer of the porous layer 10 in the laminate 1a. The first peel liner 21 is located on one main surface of the precursor layer 15. The second peel liner 22 is located on the other main surface of the precursor layer. The precursor layer 15 contains water in the spaces corresponding to the pores of the porous layer. For example, the porous layer is obtained by heating the precursor layer 15 so that this water evaporates.

[0032] The first peeling liner 21 and the second peeling liner 22 have a load of 30 mJ / m 2 The above surface free energy is achieved. This facilitates the formation of openings on the surface of the precursor layer 15 in contact with the first peel liner 21 and the second peel liner 22, and the porous layer obtained from the precursor layer 15 is likely to have the desired properties. The surface free energy of the first peel liner 21 and the second peel liner 22 is the value at 25°C and can be determined, for example, according to the method described in the examples.

[0033] In the laminate 1d, the first peeling force F1 [mN / 10mm] for the first release liner 21 is larger than the second peeling force F2 [mN / 10mm] for the second release liner 22. In this case, when the second release liner 22 is peeled from the precursor layer 15, it is easy to avoid a situation where a part of the precursor layer 15 adheres to the second release liner 22 and is peeled off (uneven peeling). The first peeling force F1 is a peeling force obtained when peeling the first non-porous layer according to a 180° peel test in a first test piece obtained by forming the first non-porous layer containing the above silicone resin on the first release liner 21. The second peeling force F2 is a peeling force obtained when peeling the second non-porous layer according to a 180° peel test in a second test piece obtained by forming the second non-porous layer containing the above silicone resin on the second release liner 22. For example, the first non-porous layer and the second non-porous layer have the same thickness. The first peeling force F1 and the second peeling force F2 can be determined, for example, according to the method described in the Examples.

[0034] The difference (F1-F2) obtained by subtracting the second peeling force F2 from the first peeling force F1 is not limited to a specific value. The difference (F1-F2) is, for example, 1 mN / 10 mm or more. In this case, when peeling the second release liner 22, it is easier to avoid a part of the precursor layer 15 from adhering to the second release liner 22 and being peeled off.

[0035] The difference (F1-F2) is desirably 2 mN / 10 mm or more, and may be 3 mN / 10 mm or more, 5 mN / 10 mm or more, 8 mN / 10 mm or more, or 10 mN / 10 mm or more. The difference (F1-F2) is, for example, 50 mN / 10 mm or less, and may be 45 mN / 10 mm or less, or 40 mN / 10 mm or less.

[0036] The first peeling force F1 is, for example, 1 to 500 mN / 10 mm, and may be 1 to 400 mN / 10 mm, 1 to 300 mN / 10 mm, or 1 to 200 mN / 10 mm.

[0037] The surface free energy of the second release liner 22 is desirably 32 mJ / m 2 or more, more desirably 35 mJ / m 2As described above. The surface free energy of the second release liner 22 is, for example, 75 mJ / m 2 or less, and may be 70 mJ / m 2 or less, or 65 mJ / m 2 or less.

[0038] The material forming the second release liner 22 is not limited to a specific material, as long as the surface free energy of the second release liner 22 is 30 mJ / m 2 The first release liner 21 contains, for example, a polyester resin such as polyethylene terephthalate (PET).

[0039] The thickness of the second release liner 22 is not limited to a specific value. The thickness of the second release liner 22 is, for example, 30 µm or more. In this case, handling of the second release liner 22 tends to be facilitated. The thickness of the second release liner 22 may be 40 µm or more, 50 µm or more, or 60 µm or more. The thickness of the second release liner 22 is, for example, 100 µm or less.

[0040] The method for producing the above-mentioned laminate 1a is not limited to a specific method. FIG. 6 is a diagram schematically illustrating an example of a method for producing a laminate according to the present invention. As shown in FIG. 6, the method for producing the laminate 1a includes, for example, heating a liquid film 55 to form a precursor layer 15 of the porous layer 10 in a state where the liquid film 55 is formed between the first release liner 21 and the second release liner 22. The liquid film 55 is a liquid film of a W / O emulsion 50. The W / O emulsion 50 has a continuous phase 51 and a dispersed phase 52. The continuous phase 51 contains a silicone resin. The dispersed phase 52 contains water. Heating of the liquid film 55 for forming the precursor layer 15 allows the continuous phase 51 to solidify. According to such a method, both surfaces of the porous layer 10 in the laminate 1a are easily opened, and the porous layer 10 easily has desired air permeability.

[0041] W / O emulsion 50 can be prepared, for example, by mixing a silicone resin, a surfactant, and water, emulsifying the mixture, and then defoaming it. A curing agent for the silicone resin may be added to the W / O emulsion 50. The silicone resin may be provided as a silicone resin composition. Water may be supplied, for example, as a dispersion of an inorganic thickener.

[0042] Surfactants typically include nonionic surfactants. Examples of surfactants include glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, polypropylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene / polyoxypropylene block copolymers, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, and polyoxyethylene fatty acid amides.

[0043] The proportion of the surfactant in the W / O emulsion 50 relative to the silicone resin composition is, for example, 0.1% by mass or more and 15% by mass or less, and may be 0.2% by mass or more and 3% by mass or less.

[0044] Inorganic thickeners are added to increase the viscosity of water, facilitate the dispersion of water in a W / O emulsion 50, and stabilize the dispersion state. Examples of inorganic thickeners include natural or synthetic smectite clays such as bentonite, montmorillonite, hectorite, saponite, soakonite, byderite, and nontronite. Another example of an inorganic thickener is magnesium aluminum silicate. Yet another example of an inorganic thickener is a composite of smectite clay or magnesium aluminum silicate with a water-soluble organic polymer such as carboxyvinyl polymer. Preferably, the inorganic thickener is smectite clay such as bentonite and montmorillonite. The content of the inorganic thickener is, for example, 0.1 parts by mass to 10 parts by mass, preferably 0.5 parts by mass to 5 parts by mass, per 100 parts by mass of water.

[0045] The proportion of the dispersed phase 52 in the W / O emulsion 50 is, for example, 30% by mass or more, and may be 40% by mass or more, or 50% by mass or more. This proportion is, for example, 80% by mass or less, and may be 70% by mass or less, or 60% by mass or less.

[0046] As shown in Figure 6, the W / O emulsion 50 is placed on the first release liner 21. The W / O emulsion 50 may also be applied on the first release liner 21. Next, the second release liner 22 is placed on the W / O emulsion 50. If necessary, the first release liner 21, the W / O emulsion 50, and the second release liner 22 are pressed in the thickness direction of the first release liner 21. This forms a liquid film 55.

[0047] Next, the continuous phase 51 of the W / O emulsion 50 is heated to solidify, and a precursor layer 15 is obtained. This heating is carried out at a temperature lower than the boiling point of water (100°C), for example. Next, the second peeling liner 22 is peeled off from the precursor layer 15, and the precursor layer 15 is heated to evaporate the water derived from the dispersed phase 52. This heating is carried out at a temperature higher than the boiling point of water, for example. This forms voids 12, and a porous layer 10 is obtained.

[0048] The applications of the porous layer 10 are not limited to specific uses. The porous layer 10 may have desired breathability, sound permeability, dustproofness, or water vapor permeability. For this reason, for example, electrical equipment, electronic equipment, and audio equipment equipped with the porous layer 10 can be provided. Furthermore, the porous layer 10 may be used in the manufacture of electrical equipment, electronic equipment, and audio equipment.

[0049] The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to the following examples.

[0050] <Example 1> 100 parts by mass of Silpot 184 elastomer manufactured by Dow-Toray, 10 parts by mass of Silpot 184 curing agent manufactured by the same company, and 9 parts by mass of the surfactant Rheodol SP-010V manufactured by Kao Corporation were stirred for 2 minutes in a foam remover manufactured by Thinky Co., Ltd. Then, 140 parts by mass of an aqueous solution in which bentonite W-100U manufactured by Hojun Co., Ltd. was dispersed at 0.9% by mass in distilled water using a homomixer was added and stirred in a foam remover for 18 minutes to obtain an emulsion. Then, the emulsion was stirred under reduced pressure to 10 kPa in a vacuum foam remover manufactured by Thinky Co., Ltd., and degassing was performed for 2 minutes while stirring at a rotation speed of 2000 rotations per minute (rpm). In this way, the W / O emulsion according to Example 1 was obtained. The W / O emulsion according to Example 1 was placed on a polyethylene terephthalate (PET) film A manufactured by Mitsubishi Chemical Corporation. Next, a PET film B manufactured by the same company was placed on top of the W / O emulsion, and the W / O emulsion and the pair of PET films were pressed using a tabletop small-scale hot roll press (HSRP-60150H) to obtain a liquid film of the W / O emulsion. Then, this liquid film was heated at 90°C for 6 minutes to cure the silicone resin and obtain a solidified film. Next, the PET film B was peeled off from this solidified film, and the solidified film was further subjected to a heat drying treatment at 150°C for 10 minutes to obtain a porous layer containing silicone resin. In this way, the laminate according to Example 1 was obtained.

[0051] <Example 2> A laminate according to Example 2 was obtained in the same manner as in Example 1, except that PET film C (HPTY5R) manufactured by Shinko Corporation was used instead of PET film A.

[0052] <Example 3> A laminate according to Example 3 was obtained in the same manner as in Example 1, except that PET film C (HPTY5R) manufactured by Shinko Corporation was used instead of PET film A, and PET film D (PJ31) manufactured by Toray Industries, Inc. was used instead of PET film B.

[0053] <Comparative Example 1> A laminate according to Comparative Example 1 was obtained in the same manner as in Example 1, except that PET film E (MRF) manufactured by Mitsubishi Chemical Corporation was used instead of PET film A, and PET film F (MRE) manufactured by the same company was used instead of PET film B.

[0054] (Surface Free Energy) Using a temperature-controlled contact angle meter DM-701 manufactured by Kyowa Interface Science Co., Ltd., 20 μm liquid droplets were dropped onto the surface of PET films A, B, C, D, E, and F using a syringe to form droplets, and the contact angle between the surface and the droplet was measured. Water, ethylene glycol, and diiodomethane were selected as the liquids. The measurement temperature was adjusted to 25°C. Based on the contact angle measurements for water, ethylene glycol, and diiodomethane, the surface free energy of each PET film was calculated according to the Kitazaki-Hata theory for the theoretical formula of surface free energy. The results are shown in Table 1.

[0055] (Peel Force) 100 parts by mass of Silpot 184 elastmer manufactured by Dow-Toray, 10 parts by mass of Silpot 184 curing agent manufactured by the same company, and 9 parts by mass of the surfactant Leodol SP-010V manufactured by Kao Corporation were stirred for 2 minutes in a foam remover manufactured by Thinky Co., Ltd. to obtain a coating solution. This coating solution was applied to the surfaces of PET films A, B, C, D, E, and F to obtain a coating film with a thickness of 100 μm. This coating film was dried at 150°C to form a non-porous layer containing silicone resin, and a test piece for measuring peel force was obtained. Using this test piece, the non-porous layer was peeled off at a tensile speed of 300 mm / min according to the 180° peel test, and the peel force [mN / 10 mm] at this time was measured. The results are shown in Table 1. This measurement was performed in an environment of 25°C.

[0056] (Aperture Ratio) Using a scanning electron microscope proX PREMIUM manufactured by PhenomWorld, images magnified 1000 times were obtained of the surface of the porous layer of the laminates for each example and comparative example. In a plan view of the surface of the porous layer, this image corresponded to a square region with a side length of 0.268 mm. By binarizing this image, the open areas were identified, and the percentage [%] of the area of ​​these open areas relative to the total area of ​​the image was calculated as the aperture ratio. The results are shown in Table 2.

[0057] (Air permeability resistance) The air permeability resistance (Wang Ken) of the porous layer of the laminates in each example and comparative example after the heat treatment described above was measured using an Ouken-type air permeability tester manufactured by Asahi Seiko Co., Ltd., in accordance with JIS P8117:2009. The results are shown in Table 2.

[0058] As shown in Table 2, the air permeability resistance (Wang Ren) of the porous layer in the laminates of each example was low, indicating good air permeability. The surface opening ratio of the porous layer in the laminates of each example was 2% or more, indicating that openings were formed on the surface of the porous layer. On the other hand, the air permeability resistance (Wang Ren) of the porous layer in the laminate of Comparative Example 1 exceeded 1000 seconds, making it difficult to say that it had good air permeability. The surface opening ratio of the porous layer in the laminate of Comparative Example 1 was 0%, and no openings were observed on the surface of the porous layer. Comparing each example with Comparative Example 1, the air permeability was 30 mJ / m 2 The results suggest that a porous layer with good breathability can be obtained by fabricating a laminate using a peelable liner (PET film) with the above surface free energy.

[0059] As shown in Table 2, in each example, after heating the liquid film at 90°C for 6 minutes to cure (pre-cur) the silicone resin, the solidified film could be peeled off the upper substrate without adhering to it. In each example, it is thought that the peeling force F1 [mN / 10m] of the lower substrate was greater than the peeling force F2 [mN / 10m] of the upper substrate, which contributed to this peeling state of the upper substrate after pre-curing.

[0060]

[0061]

[0062] A first aspect of the present invention comprises a porous layer containing a silicone resin and a first peel liner disposed on one main surface of the porous layer, wherein the first peel liner has a load capacity of 30 mJ / m 2 The present invention provides a laminate having the above surface free energy.

[0063] A second aspect of the present invention is to provide a laminate in which, in the first aspect, the laminate further comprises an adhesive layer disposed on a portion of the other main surface of the porous layer.

[0064] A third aspect of the present invention is to provide a laminate in which, in the first or second aspect, the air permeability resistance (Wangyan) of the porous layer, as measured according to Japanese Industrial Standard (JIS) P8117:2009, is 300 seconds or less.

[0065] A fourth aspect of the present invention is to provide a laminate in which the opening ratio on the surface of the porous layer is 1% or more in any one of the first to third aspects.

[0066] A fifth aspect of the present invention is a precursor layer of a porous layer containing a silicone resin, a first peel liner disposed on one main surface of the precursor layer, and a second peel liner disposed on the other main surface of the precursor layer, wherein the precursor layer contains water in the spaces corresponding to the pores of the porous layer, and the first peel liner and the second peel liner contain 30 mJ / m 2 The present invention provides a laminate having the above surface free energy, wherein the first peel force is greater than the second peel force, the first peel force is the peel force when peeling the first non-porous layer containing the silicone resin in a first non-porous layer obtained by forming the first non-porous layer on the first non-porous layer on the first non-porous layer on the first non-porous layer on the second

[0067] The sixth aspect of the present invention is to provide a laminate in which, in the fifth aspect, the difference obtained by subtracting the second peeling force from the first peeling force is 1 mN / 10 mm or more.

[0068] The seventh aspect of the present invention is a method for manufacturing a laminate according to any one of the first to fourth aspects, comprising: heating a liquid film of a W / O emulsion having a continuous phase containing a silicone resin and a dispersed phase containing water, with the liquid film formed between the first and second peel liner, to solidify the continuous phase and form a precursor layer of the porous layer, wherein the second peel liner has a water content of 30 mJ / m 2 The present invention provides a method for manufacturing a laminate having the above surface free energy.

[0069] The eighth aspect of the present invention provides a method for manufacturing a laminate, which, in the seventh aspect, includes peeling the second peeling liner from the precursor layer and heating the precursor layer to evaporate the water.

[0070] The ninth aspect of the present invention provides a laminate comprising a porous layer containing a silicone resin and an adhesive layer disposed on a portion of one main surface of the porous layer, wherein the air permeability resistance (Wangyan) of the porous layer, measured according to Japanese Industrial Standard (JIS) P8117:2009, is 300 seconds or less, and the opening ratio on the surface of the porous layer is 1% or more.

[0071] The tenth aspect of the present invention is to provide a laminate in which, in the ninth aspect, the adhesive layer has an adhesive strength of 0.1 N / 20 mm to 20 N / 20 mm.

Claims

1. The device comprises a porous layer containing a silicone resin, and a first peel liner disposed on one main surface of the porous layer, wherein the first peel liner has a density of 30 mJ / m 2 A laminate having the above surface free energy.

2. The laminate according to claim 1, further comprising an adhesive layer disposed on a portion of the other main surface of the porous layer.

3. The laminate according to claim 1, wherein the air permeability resistance (Wangyan) of the porous layer, as measured in accordance with Japanese Industrial Standard (JIS) P8117:2009, is 300 seconds or less.

4. The laminate according to claim 1, wherein the opening ratio on the surface of the porous layer is 1% or more.

5. The apparatus comprises a precursor layer of a porous layer containing a silicone resin, a first peel liner disposed on one main surface of the precursor layer, and a second peel liner disposed on the other main surface of the precursor layer, wherein the precursor layer contains water in the spaces corresponding to the pores of the porous layer, and the first peel liner and the second peel liner have a water content of 30 mJ / m 2 A laminate having the above surface free energy, wherein the first peel force is greater than the second peel force, the first peel force is the peel force when peeling the first non-porous layer containing the silicone resin in a first non-porous layer obtained by forming the first non-porous layer on the first non-porous layer on the first non-porous layer on the first non-porous layer on the second, and the second peel force is the peel force when peeling the second non-porous layer in a 180° peel test.

6. The laminate according to claim 5, wherein the difference between the first peeling force and the second peeling force is 1 mN / 10 mm or more.

7. A method for manufacturing a laminate according to claim 1, comprising: heating a liquid film of a W / O emulsion having a continuous phase containing a silicone resin and a dispersed phase containing water, with the liquid film formed between the first peel liner and the second peel liner, thereby solidifying the continuous phase and forming a precursor layer of the porous layer, wherein the second peel liner has a water content of 30 mJ / m 2 A method for manufacturing a laminate having the above surface free energy.

8. A method for manufacturing a laminate according to claim 7, comprising peeling the second peeling liner from the precursor layer and heating the precursor layer to evaporate the water.

9. A laminate comprising a porous layer containing a silicone resin, and an adhesive layer disposed on a portion of one main surface of the porous layer, wherein the air permeability resistance (Wangyan) of the porous layer, measured according to Japanese Industrial Standard (JIS) P8117:2009, is 300 seconds or less, and the opening ratio on the surface of the porous layer is 1% or more.

10. The laminate according to claim 9, wherein the adhesive layer has an adhesive strength of 0.1 N / 20 mm to 20 N / 20 mm.

Images