JP5362520B2 - Concavity and convexity laminate material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unevenness follow-up laminated member suitable for fixing a member in a mobile product such as a cell phone or a touch panel excellent in sticking performance to a step and in water resistance, and used as a waterproof double-coated tape or the like for a portable information terminal of a narrow frame specification. <P>SOLUTION: The unevenness follow-up laminated member includes a stress relaxing resin layer (A) and stress relaxing resin layers (B) formed at both sides. The laminated member has an elongation of 100% or larger, a 100% elongation stress of 2 MPa or lower, and a difference between a 300% elongation stress and the 100% elongation stress being 0.1 MPa or larger, and is used for waterproofing. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a concavo-convex followable laminated member, and more specifically, a laminated member having excellent elongation, provided with a stress relaxing resin layer (B) on both sides of a stress relaxing resin layer (A), for example, Roughness used as a double-sided tape for waterproofing on portable information terminals with narrow frame bezels, excellent in bonding properties and water resistance, suitable for fixing parts in mobile products such as mobile phones and touch panels The present invention relates to a followable laminated member.

Mobile products such as mobile phones and touch panels are devices that are used regardless of the environment, and recently, mobile products tend to be applied to various situations. In particular, use in water fields such as beaches and bathrooms is increasing, and the number of failures associated therewith is also increasing.
For example, Patent Document 1 discloses a double-sided pressure-sensitive adhesive tape having a foam base material and a pressure-sensitive adhesive layer, wherein the foam base material has a 25% compressive strength of 40 to 160 kPa and a tensile strength of 300 to 1500 N / A waterproof double-sided pressure-sensitive adhesive tape characterized by being cm ² is disclosed, and in this technology, the foam has a concave-convex followability, and the foam is made into closed cells to provide water resistance. ing. However, the size of the foamed shape is limited, and finer control is difficult. On the other hand, in recent mobile phones, those with narrow frame specifications with a narrow bezel width are increasing due to the problem of design, and it is assumed that the double-sided tape used for these is used in a narrow frame shape with a width of 2 mm or less. However, the waterproof double-sided pressure-sensitive adhesive tape has a problem that it is difficult to reduce the width of the frame from the viewpoint of the foam structure, and it is difficult to apply to the mobile phone having the narrow frame specification.

JP 2009-108314 A

  The present invention has been made under such circumstances, and is suitable for fixing a member in a mobile product such as a mobile phone and a touch panel. An object of the present invention is to provide an uneven followable laminated member used as a waterproof double-sided tape or the like for a terminal.

As a result of intensive studies to achieve the above object, the present inventors have provided a stress relaxation resin layer (B) on both sides of the stress relaxation resin layer (A), and a laminate having excellent elongation. It has been found that the purpose can be achieved by the member. The present invention has been completed based on such knowledge.
That is, the present invention
(1) A laminated member having a stress relieving resin layer (A) and a stress relieving resin layer (B) provided on both sides thereof, wherein the laminated member has an elongation of 100% or more. A concavo-convex followable laminated member having a 100% elongation stress of 2 MPa or less and a difference between 300% elongation stress and 100% elongation stress of 0.1 MPa or more and being used for waterproofing,
(2) Concavity and convexity followability according to (1) above, wherein the thickness of the stress relaxation resin layer (A) is 1 to 200 μm and the thickness of the stress relaxation resin layer (B) is 2 to 80 μm. Laminated members,
(3) The uneven followable laminated member according to (1) or (2) above, which has a frame-like form in which release sheets are attached to both sides,
(4) The uneven followable laminated member according to any one of the above (1) to (3), which is used for waterproofing with a width of 0.1 to 2 mm, and (5) a stress relaxation resin layer (A) And / or the uneven | corrugated followable laminated member in any one of said (1)-(4) description whose stress relaxation resin layer (B) is black,
Is to provide.

  According to the present invention, the stress relaxation resin layer (A) is provided with a stress relaxation resin layer (B) on both surfaces, and is a laminated member having excellent elongation, for example, in mobile products such as mobile phones and touch panels. It is possible to provide a concavo-convex followable laminated member suitable for fixing a member and the like, which has excellent bonding suitability to a step and water resistance, and is used as a waterproof double-sided tape for a portable information terminal having a narrow frame specification.

It is a top view of the sample for a measurement used for the water resistance evaluation test of a laminated member. It is the sectional view on the AA line in the said FIG. It is the BB sectional view taken on the line in the said FIG.

  The uneven followable laminated member of the present invention (hereinafter sometimes simply referred to as “laminated member”) includes a stress relieving resin layer (A) and stress relieving resin layers (B) provided on both sides thereof. The laminated member has an elongation of 100% or more, a 100% elongation stress of 2 MPa or less, and a difference between the 300% elongation stress and the 100% elongation stress is 0 It is 0.1 MPa or more and is used for waterproofing.

[Properties of uneven follow-up laminate]
In the laminated member of the present invention, the laminated member has an elongation of 100% or more, the 100% elongation stress is 2 MPa or less, and the difference between the 300% elongation stress and the 100% elongation stress is 0. 1 MPa or more.
When the laminated member has an elongation of 100% or more and the 100% elongation stress is 2 MPa or less, excellent unevenness followability and water resistance can be obtained. Further, when the difference between the 300% elongation stress and the 100% elongation stress of the laminated member is 0.1 MPa or more, excellent workability and narrow frame shape workability can be obtained. This is presumably because, for example, when the laminated member is cut and punched using a punching blade, the stress caused by pressing the punching blade is effectively transmitted to the laminated member and cut. On the other hand, when the laminated member does not have an elongation of 100% or more, or has an elongation of 100% or more, if the 100% elongation stress exceeds 2 MPa, sufficient unevenness followability and water resistance Cannot be obtained. Further, when the difference between the 300% elongation stress and the 100% elongation stress of the laminated member is less than 0.1 MPa, sufficient workability and narrow frame shape workability cannot be obtained.
The laminated member preferably has an elongation of 300% or more, and preferably has a 100% elongation stress of 1 MPa or less. Further, the laminated member preferably has a 300% elongation stress of 4 MPa or less. By satisfying these conditions, the uneven followable laminated member of the present invention has good processability and narrow frame shape workability, and is excellent in uneven followability to a step and water resistance.

The uneven followable laminated member of the present invention is excellent in water resistance and is used for waterproofing. In the present invention, the water resistance is evaluated by the following method.
<Method for evaluating water resistance of laminated member>
Evaluation was performed according to JIS C 0920 (2003) 14.2.7 Test for Second Characteristic Number 7 in Temporary Diving State of Depth 0.15-1m. FIG. 1 is a plan view of a measurement sample, FIG. 2 is a cross-sectional view taken along line AA in the plan view, and FIG. 3 is a cross-sectional view taken along line BB in the plan view. During the test, a measurement sample was prepared by bonding two transparent acrylic plates 1a and 1b having a length of 70 mm, a width of 50 mm, and a thickness of 2 mm with a frame-shaped laminated member 2 having a length of 60 mm, a width of 40 mm, and a width of 1 mm. One acrylic plate 1a of the measurement sample has a step having a cross-shaped black print 3 having a height of 10 μm and a width of 5 mm, and the other used a smooth acrylic plate 1b having no step (FIGS. 1 to 1). (See FIG. 3). After preparing the measurement sample, 24 hours later, the measurement sample is submerged to a depth of 1 m and allowed to stand for 30 minutes, and then visually inspected whether water has entered the test piece. Those that do not penetrate and those that do not cause clouding inside the test piece are accepted.

[Stress relaxation resin layer (A)]
As a method for forming the stress relaxation resin layer (A) (hereinafter sometimes simply referred to as “resin layer (A)”) in the uneven followable laminated member of the present invention, both surfaces of the resin layer (A) are used. In addition, any method may be used as long as the laminated member of the present invention provided with the stress relaxation resin layer (B) described later has the above-described properties. Casting is possible even for resins with low temperatures and resins with melting points close to the decomposition temperature, as compared to the extrusion method (melt extrusion method), etc., and a film with good thickness uniformity and surface properties can be obtained. Film forming method by solution method (solution casting method) or film forming method by active energy ray irradiation method that can select hard and soft curable resin by selecting active energy ray irradiation amount and active energy ray curable compound Preferably used Door can be.

<Casting method (solution casting method)>
Specifically, the resin to be used is dissolved in a suitable organic solvent, for example, ethyl acetate, methyl ethyl ketone, or toluene, and an additive such as a plasticizer is added as necessary to add a water-like dope (coating). (Working fluid) is prepared. This dope completely removes dust and bubbles, and then, for example, uses a process sheet as a support, and casts it on one side to form the resin layer. In addition, as long as it is generally used as a process sheet, there is no restriction | limiting in particular, It can use. For example, a polyolefin film or a polyethylene terephthalate film in which a silicone-based or fluorine-based release layer is provided on the surface side in contact with the resin layer is preferable.
The resin layer (A) produced by this casting method is not particularly limited, and examples thereof include acrylic resin, epoxy resin, polyester resin, polyether resin, and silicone rubber. A polyester resin is preferable from the viewpoint of obtaining a good strength, and among them, a polyester urethane resin is preferable. These resins can be used in combination of two or more.

<Active energy ray irradiation method>
Examples of the active energy ray-curable compound used in the active energy ray irradiation method include an active energy ray-curable oligomer, a mixture of the oligomer and the active energy ray-curable monomer, or a polymerizable double bond in the side chain. A polymer into which an active energy ray-curable functional group is introduced, a mixture of this polymer and an active energy ray-curable monomer, or the like can be used.
In the present invention, the active energy ray refers to an electromagnetic wave or a charged particle beam having an energy quantum, that is, an ultraviolet ray or an electron beam.

≪Preparation of cured resin layer (A) by irradiation with active energy rays≫
In the case where ultraviolet rays are used as the active energy ray-curable compound described above and active energy rays, a photopolymerization initiator used as necessary, and a tackifier, an antioxidant, an ultraviolet absorber, light, if necessary Prepare a coating solution containing a stabilizer, softener, leveling agent, solvent, etc., and apply this coating solution on one side of the process sheet described in the above-mentioned casting method to a predetermined thickness. As described above, coating is performed by a known coating method, and the obtained coating film is subjected to ultraviolet irradiation treatment with such a light amount that a stress relaxation resin layer (A) having desired performance can be obtained.

The thickness of the stress relaxation resin layer (A) obtained by such a casting method or active energy ray irradiation method is preferably 1 to 200 μm. When the thickness of the resin layer (A) is less than 1 μm, the processability of the laminated member and the narrow frame shape processability may be insufficient, while when it exceeds 200 μm, the unevenness followability may be insufficient. . Moreover, when it becomes too thick, a solvent will remain easily in a resin layer (A), and it may affect visibility. A more preferable thickness of the resin layer (A) is 2 to 150 μm.
Moreover, it is preferable that a stress relaxation resin layer (A) is not a foam. That is, it is preferable not to have pores having a pore diameter of 1 mm or more, and it is more preferable not to have pores having a pore diameter of 0.5 mm or more. When the stress relaxation resin layer (A) has pores having a pore diameter of 1 mm or more, water resistance may be insufficient.
In the laminated member of the present invention, in the storage elastic modulus measured at a temperature of 23 ° C., the resin layer (A) is referred to as a stress relaxation resin layer (B) (hereinafter simply referred to as a resin layer (B)). It is preferable that it is larger than. Thereby, processability improves, such as preventing the resin layer (B) from exuding when the laminated member of the present invention is cut. The storage elastic modulus at a temperature of 23 ° C. of the resin layer (A) is usually about 0.1 to 20 MPa, preferably 1 to 10 MPa.

[Stress relaxation resin layer (B)]
In the laminated member of this invention, a stress relaxation resin layer (B) is provided on both surfaces of the resin layer (A) mentioned above.
The resin layer (B) preferably has a thickness of 2 to 80 μm. If the thickness is less than 2 μm, the unevenness followability and water resistance of the laminated member may be insufficient, while if it exceeds 80 μm, the workability may be insufficient. A more preferable thickness of the resin layer (B) is 8 to 60 μm.
The storage elastic modulus at a temperature of 23 ° C. of the resin layer (B) may be smaller than the storage elastic modulus of the resin layer (A) at a temperature of 23 ° C. for the reason described in the description of the resin layer (A). preferable. The storage elastic modulus at a temperature of 23 ° C. of the resin layer (B) is usually about 0.01 to 5 MPa, preferably 0.05 to 1 MPa.
The resin for forming the resin layer (B) is not particularly limited as long as the resin layer (B) having the above-described properties is formed. For example, acrylic resin, epoxy resin, polyester resin, polyether Resin, urethane resin, silicone rubber, active energy ray curable resin, and the like can be used, but acrylic resin and polyester resin are preferable from the viewpoint of obtaining sufficient unevenness followability and processability. These resin may be used individually by 1 type, and may be used in combination of 2 or more type. The resin forming the resin layer (B) is preferably an adhesive for fixing the member.
The two layers of the resin layer (B) provided on both surfaces of the resin layer (A) are preferably the same from the viewpoint of the manufacturability of the laminated member of the present invention, but may be different.
In the laminated member of the present invention, a release sheet may be attached to the resin layer (B) as necessary. Examples of the release sheet include papers such as glassine paper, coated paper, and laminated paper, and various plastic films coated with a release agent such as silicone resin. Although there is no restriction | limiting in particular about the thickness of this peeling sheet, Usually, it is about 20-150 micrometers.

Next, a method for producing the uneven followable laminated member of the present invention will be described by giving an example in which the resin layer (A) is formed by a casting method.
[Manufacture of uneven followable laminated members]
First, the resin for forming the resin layer (A) by the above-described casting method is dissolved in a suitable solvent to prepare a resin layer (A) forming coating solution having a solid content concentration of about 5 to 60% by mass. . On the other hand, the resin for forming the resin layer (B) described above is dissolved in an appropriate solvent to prepare a coating solution for forming a resin layer (B) having a solid content concentration of about 5 to 60% by mass.
Next, the coating liquid for forming the resin layer (A) is cast on the release treatment surface of the process sheet (release sheet) by a known method, and then is dried to have a thickness of about 1 to 200 μm. A resin layer (A) is formed, and a resin layer (A) with a process sheet is produced. On the other hand, the coating liquid for forming the resin layer (B) is dried on the release treatment surface of the release sheet by, for example, knife coating, roll coating, bar coating, blade coating, die coating, gravure coating, or the like. After coating so that thickness may be set to about 2-80 micrometers, it dries and forms a resin layer (B), and produces a resin layer (B) with a peeling sheet.
Next, this resin layer with release sheet (B) is bonded so that the resin layer (B) surface is in contact with the resin layer (A) surface of the resin layer with process sheet (A), and the process sheet and A resin layer (A) sandwiched between release sheets is produced. Next, the process sheet is peeled, and the resin layer (B) with a release sheet is bonded to the exposed resin layer (A) surface so that the resin layer (B) surface is in contact with the resin layer (B). The laminated member of the present invention having a sheet attached thereto can be produced.

Next, the use of the uneven followable laminated member of the present invention will be described.
[Applications of uneven follow-up laminates]
The laminated member of the present invention is a laminated member having a stress-relieving resin layer (B) on both sides of the stress-relaxing resin layer (A) and having excellent elongation, and is a mobile product such as a mobile phone or a touch panel. It is suitable for fixing members, etc., and has excellent bonding suitability to water and water resistance, and is used as a waterproof double-sided tape for portable information terminals with narrow frame specifications.
Conventional double-sided adhesive tapes for waterproofing use a foam base material as a core material in order to impart impact resistance and step following ability, but the pore diameter of the foam base material is about 1 mm. As a waterproof double-sided tape for portable information terminals with narrow frame specifications, there is a problem that waterproofness is insufficient and it is difficult to apply. In contrast, the laminated member of the present invention uses a resin film formed by a casting method or a resin film formed by active energy ray irradiation as the stress relaxation resin layer (A) of the core material. Therefore, it has no pores, is excellent in water resistance, has a width of 0.1 to 2 mm, and further has a width of 0.2 to 1 mm and is used for waterproofing. That is, it can be applied as a waterproof double-sided tape to a portable information terminal with a narrow frame specification.
As a form of the lamination | stacking member of this invention, it can be set as the frame shape form by which a peeling sheet is stuck on both surfaces. As the release sheet, the release sheet shown in the description of the stress relaxation resin layer (B) described above can be used.
Moreover, the laminated member of this invention can make a stress relaxation resin layer (A), a stress relaxation resin layer (B), or both black. In particular, when the laminated member has a frame shape, a black one is preferable.
The blackening of the resin layer (A) or the resin layer (B) can be performed by mixing carbon black or a black pigment or dye.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
In addition, the various characteristics in each example were calculated | required according to the method shown below.
<Resin layer (A), resin layer (B)>
(1) Storage elastic modulus of resin layer (A) and resin layer (B) at a temperature of 23 ° C. A resin layer was laminated, cut to a thickness of 2 mm, and cut into a cylinder having a diameter of 8 mm to prepare a measurement sample. Subsequently, the storage elastic modulus at a temperature of 23 ° C. was measured using a dynamic viscoelasticity measuring apparatus [manufactured by Rheometric Co., Ltd., model name “DYNAMIC ANALYZER RDA-II”].

<Concavity and convexity laminated member>
(2) Elongation at break, 100% elongation stress, 300% elongation stress Laminating a concavo-convex followable laminated member to a thickness of 200 μm, cutting to a width of 15 mm and a length of 70 mm to produce a measurement sample did. Next, using a tensile tester [manufactured by Shimadzu Corporation, model number “AG-IS”], both ends of the measurement sample were set to 10 mm, and the measurement was performed at a temperature of 23 ° C. and a width of 15 mm and a length of 50 mm. The part was measured at a pulling speed of 200 mm / min.
Elongation at break: Elongation rate to break 100% elongation Stress: Stress at 100% elongation of sample 300% Elongation stress: Stress at 300% elongation of sample

(3) Workability: Ten standard concavo-convex laminated members are stacked in a standard environment (23 ° C., 50% RH) and cut into A4 size with an NT cutter. At that time, there is no paste exuding from the end portion by visual inspection, and if there is no end portion deformation, ○: pass, and if there is paste exudation and end portion deformation, X: reject.
(4) Concavity and convexity followability: Straight black printing with a length of 50 mm, a width of 5 mm, and a thickness of 20 μm was performed on a smooth acrylic plate to produce concavities and convexities. A concavo-convex followable laminated member was attached to the entire concavo-convex surface. At that time, the presence or absence of air pockets (air) at the edge of the black print end was confirmed with an optical microscope (magnification 100 times). If there is no air and can be pasted, ○: pass, otherwise x: fail.
(5) Water resistance: According to <Water resistance evaluation method for laminated member> described in the text of the specification, the presence or absence of water intrusion into the test piece was confirmed visually, and the water resistance was evaluated based on the following criteria. .
○ (Pass): No water intrusion inside the test piece △ (Fail): Clouding occurred inside the test piece × (Fail): Water intrusion inside the test piece (6) Narrow frame workability: Standard environment The bottom (23 ° C., 50% RH), uneven followable laminated member was die-cut using a flat die into a frame shape having a length of 60 mm, a width of 40 mm, and a width of 1 mm to prepare a sample. At that time, if the sample width was measured using a microgauge and the width was within the range of 1 mm ± 0.2 mm, the narrow frame shape could be processed as ○ (pass). It was set as x (failed) as what was not able to process a narrow frame shape.

Preparation Example 1 Preparation of Coating Solution for Forming Resin Layer (A) Polyester urethane resin [manufactured by Toyobo Co., Ltd., product name “Byron UR3200” concentration 30 mass%] was diluted with methyl ethyl ketone (MEK) to obtain a solid content of 25 mass. % Resin layer (A) forming coating solution 1 was prepared.
Polyester urethane resin [manufactured by DIC, product name “Bernock 16-416” concentration: 30% by mass] was diluted with MEK to prepare a coating solution 2 for forming a resin layer (A) having a solid content of 25% by mass.
Polyester urethane resin [manufactured by Toyobo Co., Ltd., product name “Byron UR5537” concentration 30 mass%] was diluted with MEK to prepare a coating solution 3 for forming a resin layer (A) having a solid content of 25 mass%.
Polyester urethane resin [manufactured by Toyobo Co., Ltd., product name “Byron UR3200” concentration 30% by mass] and colorant [manufactured by Toyo Ink Co., Ltd., product name “Multilac A-903 Black” concentration 70% by mass] have a solid content ratio of 10 The resin layer (A) forming coating solution 4 having a solid content of 25% by mass was prepared by adding mass% and diluting with MEK.

Preparation Example 2 Preparation of Resin Layer (B) Forming Coating Solution Acrylate ester copolymer obtained by copolymerizing 79 parts by mass of n-butyl acrylate, 20 parts by mass of methyl acrylate, and 1 part by mass of hydroxyethyl acrylate To 100 parts by mass of the combined polymer (molecular weight: 1,200,000, concentration: 30% by mass), 0.1 part of toluene and xylylene diisocyanate trifunctional adduct [manufactured by Soken Chemical Co., Ltd., product name “TD-75” concentration: 75% by mass] Part by mass was added and mixed to prepare a coating solution 5 for forming a resin layer (B) having a solid content of 25% by mass.
Polyester urethane resin [manufactured by Toyobo Co., Ltd., product name “Byron UR8700” concentration of 30% by mass] was diluted with MEK to prepare a coating solution 6 for forming a resin layer (B) having a solid content of 25% by mass.

Example 1
A coating film 1 for forming a resin layer (A) is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET38T103-1” thickness 38 μm] using a die coater so that the film thickness after drying is 20 μm. After drying at 120 ° C. for 1 minute, a release film [manufactured by Lintec, product name “SP-PET 381031” thickness 38 μm] was bonded to obtain a stress relaxation resin layer (A) 7. Next, a resin film (B) forming coating solution 5 is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET38T103-1” thickness of 38 μm] using a die coater so that the film thickness after drying becomes 40 μm. And dried at 120 ° C. for 1 minute, and then the coated surface was bonded to the stress relaxation resin layer (A) 7 from which one release film was peeled to obtain a laminate. Further, the resin layer (B) forming coating solution 5 is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET 381031” thickness 38 μm] using a die coater so that the film thickness after drying becomes 40 μm. And after drying at 120 degreeC for 1 minute, the other peeling film of the stress relaxation resin layer (A) 7 was peeled, and the coating surface was bonded on the surface, and the uneven | corrugated followable laminated member 8 was obtained. The evaluation results of various properties are shown in Table 1.

Example 2
In Example 1, the same operation as in Example 1 was performed except that the resin layer (A) forming coating solution 2 was used instead of the resin layer (A) forming coating solution 1, and the unevenness following property was achieved. A laminated member 9 was obtained. The evaluation results of various properties are shown in Table 1.

Example 3
In Example 1, both the resin layer (B) and Example 1 were used except that the resin layer (B) forming coating solution 6 was used instead of the resin layer (B) forming coating solution 5. The same operation was performed and the uneven | corrugated followable laminated member 10 was obtained. The evaluation results of various properties are shown in Table 1.

Example 4
In Example 1, in place of the resin layer (A) forming coating solution 1, the resin layer (A) forming coating solution 4 was used, except that the film thickness after drying was 10 μm. The same operation as Example 1 was performed and the black uneven | corrugated followable laminated member 11 was obtained. The evaluation results of various properties are shown in Table 1.

Comparative Example 1
In Example 1, the same operation as in Example 1 was performed except that the resin layer (A) forming coating solution 3 was used instead of the resin layer (A) forming coating solution 1, and the laminated member 12 was used. Got. The evaluation results of various properties are shown in Table 1.

Comparative Example 2
A coating film 5 for forming the resin layer (B) is applied to a release film [manufactured by Lintec, product name “SP-PET38T103-1” thickness 38 μm] using a die coater so that the film thickness after drying is 50 μm. Then, after drying at 120 ° C. for 2 minutes, a release film [manufactured by Lintec Corporation, product name “SP-PET 381031” thickness 38 μm] was bonded to obtain a stress relaxation resin layer (B). Subsequently, the two obtained stress relaxation resin layers (B) were bonded together, and the laminated member 13 was obtained. The evaluation results of various properties are shown in Table 1.

Comparative Example 3
A coating film 5 for forming a resin layer (B) is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET38T103-1” thickness 38 μm] using a die coater so that the film thickness after drying is 40 μm. Then, after drying at 120 ° C. for 1 minute, it was bonded to a PET film [manufactured by Toray Industries, Inc., “Lumirror T60” thickness 25 μm] to obtain a laminate. Further, the resin layer (B) forming coating solution 5 is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET 381031” thickness 38 μm] using a die coater so that the film thickness after drying becomes 40 μm. And after drying at 120 degreeC for 1 minute, it bonded on the PET surface of the said laminated body, and the laminated member 14 was obtained. The evaluation results of various properties are shown in Table 1.

Comparative Example 4
A coating film 5 for forming a resin layer (B) is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET38T103-1” thickness 38 μm] using a die coater so that the film thickness after drying is 40 μm. Then, after drying at 120 ° C. for 1 minute, it was bonded to a black polyolefin foam (manufactured by Sekisui Chemical Co., Ltd., product name “Bolara XL-H # 03001” thickness 100 μm) to obtain a laminate. Further, the resin layer (B) forming coating solution 5 is applied to a release film [manufactured by Lintec Corporation, product name “SP-PET 381031” thickness 38 μm] using a die coater so that the film thickness after drying becomes 40 μm. And after drying at 120 degreeC for 1 minute, it bonded with the black polyolefin surface of the laminated body, and the laminated member 15 was obtained. The evaluation results of various properties are shown in Table 1.

  The uneven followable laminated member of the present invention is a laminated member having excellent elongation, in which a stress relaxing resin layer (B) is provided on both surfaces of a stress relaxing resin layer (A), such as a mobile phone or a touch panel. It is used as a waterproof double-sided tape or the like for a portable information terminal having a narrow frame with a narrow bezel, which is suitable for fixing a member in a mobile product and has excellent bonding suitability to a step and water resistance.

DESCRIPTION OF SYMBOLS 1a Transparent acrylic board 1b Transparent acrylic board 2 Frame-shaped laminated member 3 Cross-shaped black printing

Claims (5)

  A laminated member having a stress relaxing resin layer (A) and a stress relaxing resin layer (B) provided on both surfaces thereof, wherein the laminated member has an elongation of 100% or more, and is 100% An uneven followable laminated member having an elongation stress of 2 MPa or less and a difference between 300% elongation stress and 100% elongation stress of 0.1 MPa or more and used for waterproofing.   The uneven | corrugated followable laminated member of Claim 1 whose film thickness of a stress relaxation resin layer (A) is 1-200 micrometers, and whose film thickness of a stress relaxation resin layer (B) is 2-80 micrometers.   The uneven | corrugated followable laminated member of Claim 1 or 2 which has a frame shape form by which a peeling sheet is stuck on both surfaces.   The uneven | corrugated followable laminated member in any one of Claims 1-3 used for waterproofing by the width | variety of 0.1-2 mm.   The uneven | corrugated followable laminated member in any one of Claims 1-4 whose stress relaxation resin layer (A) and / or stress relaxation resin layer (B) are black.

Images