TWI696874B - Laminate - Google Patents

Abstract

Provided is a laminated body which can be easily separated when the image display device body and the touch panel are to be separated when using a touch panel having a fine concave-convex structure on the surface, and thus can be easily separated from the surface of the touch panel The removal of the adhesive member includes: a liquid crystal panel; a touch panel with a fine concave-convex structure on the surface; and these fixed adhesive members, and the adhesive member has a substrate, a first adhesive layer, and a second adhesive layer, compared to Adhesive strength W3 of the first adhesive layer and substrate, Adhesive strength W3' of the first adhesive layer and substrate, and Adhesive strength W1 of the first adhesive layer and touch panel, Second adhesive layer and liquid crystal panel The adhesive strength W5 is small, and the breaking strength W4 of the substrate is greater than W3 and/or W1.

Description

Laminate

The invention relates to an image display device with a touch panel.

An image display device with a touch panel is a device in which a touch panel is arranged on the side of an image display device body such as a liquid crystal panel where an image is displayed. By pressing the area corresponding to the input surface of the touch panel, such as a button, displayed on the main body of the image display device with a finger or the like, various devices (personal computers, personal computers, Mobile phone, automatic teller machine (Automatic Teller Machine, ATM, etc.) to operate.

In an image display device with a touch panel, a small gap (air layer) is provided between the touch panel and the image display device body to protect the image display device body. However, there is a problem in that light reflection occurs at the interface between the touch panel and the air layer and the interface between the image display device body and the air layer, and the visibility of the image of the image display device body decreases.

To suppress the decrease in visibility, an image display device with a touch panel is proposed, which has a fine uneven structure on the opposing surfaces of the image display device body and the touch panel (for example, refer to Patent Document 1).

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2013-125317

Moreover, as a method of fixing the touch panel to the body of the image display device, there are methods such as arranging a spacer between each member and using a fixing member such as a screw to fix the touch panel and the figure in a predetermined positional relationship. The display body is fixed.

In recent years, in accordance with requirements for reducing manufacturing costs and the like, a fixing method that replaces the existing method has been sought. For example, if an adhesive member provided with an adhesive layer on both sides of a base material such as nonwoven fabric or foamed polyurethane is used to bond the touch panel and the image display device body, the two can be easily and cost-effectively者 fixed.

In the case of using such a fixing method of the adhesive member, when the attachment positions of the touch panel and the image display device body are staggered, the fixed touch panel and the image display device body must be separated and corrected to the regulations Position relationship, and then use the adhesive member to bond the touch panel and the image display device body again.

In addition, after assembling the image display device with the touch panel, if any of the touch panel and the image display device body becomes defective, it is also necessary to separate the fixed touch panel from the image display device body, And replace the defective component, and assemble the image display device with the touch panel again.

However, as described in Patent Document 1, when a fine concavo-convex structure is provided on the surface of the image display device body or the touch panel, the fine concavo-convex structure contacts the adhesive layer of the adhesive member, and then the strength becomes very strong . Especially Yu Wei When the period of the fine concavo-convex structure is 400 nm or less, the subsequent strength tends to become stronger. Therefore, if an adhesive member is used to fix a touch panel having a fine uneven structure on the surface and an image display device body having a fine uneven structure on the surface, it may become difficult to separate these members.

For example, if the fine uneven structure is provided only on the surface of the touch panel, the touch panel and the image display device body become easier to separate from the case where the fine uneven structure is also provided on the surface of the image display device body.

However, if the main body of the image display device is separated from the touch panel provided with a fine uneven structure on the surface, an adhesive layer or a substrate may remain on the surface of each member, and it may be difficult to remove these. In addition, sometimes the surface of each member is damaged when the adhesive layer or the substrate is removed.

The image display device body is more expensive than the touch panel, so it is desirable to minimize the removal of the adhesive layer or substrate from the image display device body and reuse it without damaging the surface. Therefore, it is important whether the image display device body and the touch panel can be separated in such a manner that the adhesive member peels off at the interface with the image display device body and remains on the touch panel side.

However, even if the adhesive member remains on the side of the touch panel, the fine uneven structure is provided on the surface of the touch panel, so the adhesion strength is high. Therefore, it is sometimes difficult to remove (peel) the adhesive member from the touch panel. In addition, the surface of the touch panel may be damaged during removal.

As described above, in the case where the attachment positions of the touch panel and the image display device body are staggered, it is necessary to separate The adhesive member is removed, and a new adhesive member is used to fix the touch panel and the image display device body again. However, when a fine uneven structure is provided on the surface of the touch panel, it may be difficult to remove the adhesive member remaining on the surface of the touch panel. Therefore, when the adhesive member cannot be removed, it is necessary to use a new touch panel to assemble the image display device with the touch panel.

In addition, after assembling the image display device with the touch panel, for example, in the case where the image display device body is defective, it is necessary to separate the touch panel from the image display device body and attach the touch panel to the Another image display device body. However, when a fine uneven structure is provided on the surface of the touch panel, it may be difficult to remove the adhesive member remaining on the surface of the touch panel. Therefore, in the case where the adhesive member cannot be removed, sometimes the touch panel after separation cannot be reused even though the touch panel has no special defects.

In this way, by using a touch panel having a fine concave-convex structure on the surface, it is possible to provide a touch panel-attached image display device with reduced visibility, but it is difficult to efficiently manufacture such a touch panel-attached image display device Image display device.

The present invention is made in view of the above facts, and provides an image display device with a touch panel. When a touch panel with a fine uneven structure on the surface is used, when the image display device body and the touch are to be used When the panel is separated, it can be easily separated, and the adhesive member can be easily removed from the surface of the touch panel.

The inventors of the present invention conducted intensive studies, and as a result, it was found that the base material remaining on the surface of each member cannot be left after the touch panel is separated from the image display device body The reason for the sufficient removal of the adhesive layer, or the damage to the surface of each component during the removal is that the base material of the adhesive component breaks during separation or removal. Therefore, it was found that by combining the adhesive strength of the touch panel and the adhesive member, the adhesive strength of the image display device body and the adhesive member, the adhesive strength of the adhesive layer and the substrate in the adhesive member, and the fracture of the substrate of the adhesive member The relationship of strength is set as appropriate, and the image display device body and the touch panel can be easily separated, and the adhesive member can be easily removed from the separated touch panel surface, thus completing the present invention.

That is, the present invention has the following aspects.

[1] A laminate including a first member having a plurality of convex portions on a surface, a second member disposed opposite to the first member via a gap, and the first member and the first member 2 member-fixed adhesive members; and the average height of the plurality of convex portions is 80 nm or more and 500 nm or less, the average interval from adjacent convex portions is 20 nm or more and 400 nm or less, and the aspect ratio (average height/period) is 0.8 or more And 5.0 or less; the adhesive member has: a substrate, a first adhesive layer laminated on one surface of the substrate, and a second adhesive layer laminated on the other surface of the substrate, and the The first adhesive layer is in contact with the surface of the first member on the side having the plurality of protrusions, and the second adhesive layer is in contact with the surface of the second member, whereby the first member And fixing the second member; when the strength of the base material of the adhesive member is F1, the peeling force of the first member and the adhesive member is F2, and the second member and the When the peeling force of the adhesive member is F3, F1 to F3 satisfy the following relationship: F2<14N/10mm

F3<F2<F1.

[2] The laminate according to [1], wherein the base material of the adhesive member has a breaking strength of 100 MPa or more.

[3] The laminate according to [1], wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2. , The adhesive strength of the substrate and the first adhesive layer is set to W3, the adhesive strength of the substrate and the second adhesive layer is set to W3', the second adhesive layer When the breaking strength of is W2' and the bonding strength of the second member and the first adhesive layer is W5, W5 is smaller than W1, W2, W2', Either W3 or W3'.

[4] The laminate according to [1], wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2. When the bonding strength of the base material and the first adhesive layer is W3, the W1 is smaller than either of the W2 and the W3.

[5] The laminate according to [1], wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2. When the bonding strength of the base material and the first adhesive layer is W3, the W2 is smaller than either of the W1 and the W3.

[6] The laminate according to [5], wherein the adhesive constituting the first adhesive layer and the second adhesive layer is soluble in water or alcohol.

[7] The laminate according to [1], wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2. When the bonding strength between the base material and the first adhesive layer is W3, the W3 is smaller than either of the W1 and the W2.

[8] The laminate according to [7], wherein the adhesive constituting the first adhesive layer and the second adhesive layer is soluble in water or alcohol.

[9] The laminate according to [3], wherein the W5 is 1 N/10 mm or more and 13 N/10 mm or less.

[10] The laminate according to [1], wherein the adhesive strength between the first adhesive layer and the first member is 3 N/10 mm or more and 14 N/10 mm or less.

[11] The laminate according to [1], wherein the adhesive constituting the first adhesive layer and the second adhesive layer is soluble in water or alcohol.

[12] The laminate according to [1], wherein the first adhesive layer and the second adhesive layer are made of the same adhesive.

[13] The laminate according to [1], wherein the refractive index of the first member on the surface side having the plurality of convex portions continuously increases from the front ends of the plurality of convex portions toward the base.

[14] The laminate according to any one of [1] to [13], wherein the first member is a touch panel, the second member is an image display device body, and the plurality of convex portions The touch panel is disposed on a surface of the image display device facing the body of the touch panel.

As another aspect of the present invention, it has the following features.

(1) An image display device with a touch panel, including: image display A device body, a touch panel disposed on a side of the image display device body opposite to the image displayed via the gap, and an adhesive member fixing the image display device body and the touch panel; The touch panel has a fine concave-convex structure with a period of 400 nm or less on the surface facing the body of the image display device; the adhesive member has: a substrate, a first layer laminated on one surface of the substrate An adhesive layer and a second adhesive layer stacked on the other surface of the substrate, and the second adhesive layer is in contact with the surface of the image display device body on the side where the image is displayed, so The first adhesive layer is in contact with the surface of the touch panel on the side having the fine uneven structure, thereby fixing the image display device body and the touch panel; and compared to the second The adhesive strength between the adhesive layer and the substrate, the adhesive strength between the first adhesive layer and the substrate, and the adhesive strength between the first adhesive layer and the touch panel, the second The adhesive strength between the adhesive layer and the image display device body is small, compared with the adhesive strength between the first adhesive layer and the substrate, and the adhesive strength between the first adhesive layer and the touch panel Following at least one of the strengths, the base material has a large breaking strength.

(2) The image display device with a touch panel according to (1), wherein the fine uneven structure includes a plurality of convex portions, and the average height of the convex portions is 80 nm or more and 500 nm or less, the The period of the convex portion is 20 nm or more and 400 nm or less, and the aspect ratio (average height/period) of the convex portion is 0.8 or more and 5.0 or less.

(3) The image display device with a touch panel according to (1) or (2), wherein the bonding strength between the first adhesive layer and the image display device body is 1 N/10 nm or more and 13N/10nm or less.

(4) The image display device with a touch panel according to any one of (1) to (3), wherein the bonding strength between the second adhesive layer and the touch panel is 3N/10nm ~14N/10nm.

According to the present invention, an image display device with a touch panel can be provided. When a touch panel with a fine uneven structure on the surface is used, it is easy to separate the image display device body from the touch panel Can be easily removed from the surface of the touch panel.

10: Image display device (image display device with touch panel)

12: Backlight

20: LCD panel (image display device body)

21: The first glass substrate

22: Second glass substrate

23: Liquid crystal layer

24: 1st polarizing film

25: 2nd polarizing film

30: Adhesive members

32: substrate

34: 2nd adhesive layer

36: 1st adhesive layer

40: Touch panel

42: Cover glass

44, 46: Adhesive layer

50: electrode substrate

52: substrate body

54: 1st transparent electrode

56: 2nd transparent electrode

60: Low reflection film

62: convex part (fine concave-convex structure)

64: substrate film

66: hardened resin layer

70: mold

72: storage tank

74: Active energy ray curable resin composition

76: pneumatic cylinder

78: nip roller

80: Active energy ray irradiation device

82: peeling roller

84: Aluminum substrate

86: pores

88: oxide film

90: Pore generation point

H: average height

P: period (average interval)

S: input face

W1, W3, W3’, W5: adhesion strength

W2, W2’, W4: breaking strength

1 is a cross-sectional view showing an example of an image display device with a touch panel of the present invention.

2 is a cross-sectional view showing an example of a low-reflection film used in an image display device with a touch panel of the present invention.

3 is a configuration diagram showing an example of a low-reflection film manufacturing apparatus.

4( a) to (f) are schematic diagrams showing manufacturing steps of a mold having anodized aluminum on the surface.

5 is a schematic diagram for explaining peeling of the adhesive member and the liquid crystal panel, and peeling of the adhesive member and the touch panel.

Hereinafter, the present invention will be described in detail.

In addition, in this specification, the term "fine pore" refers to the surface of the aluminum substrate The concave portion of the fine uneven structure formed by the oxide film.

In addition, "(meth)acrylate" is a general term for acrylate and methacrylate, "(meth)acrylic acid" is a general term for acrylic acid and methacrylic acid, and "(meth)acrylonitrile" is acrylonitrile and methacrylate Generic term for acrylonitrile, "(meth)acrylamide" is the general term for acrylamide and methacrylamide.

In addition, "active energy rays" means visible rays, ultraviolet rays, electron beams, plasma, heat rays (infrared rays, etc.), and the like.

In addition, “transparent” means that at least light having a wavelength of 400 nm or more and 760 nm or less is transmitted.

"Image display device with touch panel"

The image display device with a touch panel of the present invention (hereinafter, abbreviated as "image display device") includes: an image display device body; a touch panel arranged opposite to the image display device body through a gap The side where the image is displayed; the adhesive member fixes the image display device body and the touch panel. In addition, the touch panel has a fine concave-convex structure with a period of 400 nm or less on the surface facing the image display device body.

FIG. 1 is a cross-sectional view showing an example of the image display device of the present invention.

The image display device 10 of this example includes: a liquid crystal panel 20 as the main body of the image display device; a touch panel 40 disposed opposite to the side of the liquid crystal panel 20 where the image is displayed via a gap; The liquid crystal panel 20 and the touch panel 40 are fixed; and the backlight 12 is disposed on the opposite side of the side of the liquid crystal panel 20 where the touch panel 40 is disposed.

Hereinafter, each member will be described.

<LCD panel>

The liquid crystal panel 20 of this example includes a first glass substrate 21 on which a color filter (not shown), a transparent electrode (not shown), an alignment film (not shown), etc. are formed; a second glass substrate 22 is formed There are transparent electrodes (not shown), alignment films (not shown), etc.; the liquid crystal layer 23 is sandwiched between the first glass substrate 21 and the second glass substrate 22; the first polarizing film 24, interposing the adhesive layer (omitted) (Illustrated)) is attached to the surface of the first glass substrate 21 opposite to the liquid crystal layer 23; and the second polarizing film 25 is attached to the opposite side of the liquid crystal layer 23 via an adhesive layer (not shown) The surface of the second glass substrate 22 on the side.

Examples of the adhesive of the adhesive layer include known transparent adhesives and transparent adhesives for optical applications.

<touch panel>

The touch panel 40 of this example is an electrostatic capacitance type touch panel that detects the position of a conductive body (finger, metal, etc.) that approaches or contacts the input surface S in the form of a change in electrostatic capacitance, and includes: an input surface The cover glass 42 of S; the electrode substrate 50, sandwiching the cover glass 42, and attached to the opposite side of the input surface S via the adhesive layer 44; the detection portion (not shown), electrically connected to the electrode substrate 50 The transparent electrode detects the change in electrostatic capacitance when the conductor approaches or contacts the input surface S; and the low-reflection film 60 is bonded to the surface of the electrode substrate 50 via the adhesive layer 46.

(Electrode substrate)

The electrode substrate 50 includes: a substrate body 52; a stripe-shaped first transparent electrode 54 formed on one surface of the substrate body 52 and including a plurality of electrode patterns extending in the first direction; and a stripe-shaped second transparent electrode 56 , Formed on the other surface of the substrate body 52, and includes a plurality of electrode patterns extending in the second direction crossing the first direction.

The substrate body 52 includes transparent plates, films, sheets, and the like. Examples of the material of the substrate body 52 include glass, acrylic resin, polycarbonate, styrene resin, polyester, cellulose resin (triacetyl cellulose, etc.), polyolefin, and alicyclic polyolefin. .

The first transparent electrode 54 and the second transparent electrode 56 are thin films that can transmit light and have conductivity.

Examples of the first transparent electrode 54 and the second transparent electrode 56 include a conductive metal oxide thin film and the like. Examples of the conductive metal oxide include tin-doped indium oxide (hereinafter referred to as indium tin oxide (ITO)).

(Detection Department)

The detection unit applies a predetermined voltage to the transparent electrode, for example, and detects a change in electrostatic capacitance between the conductor and the electrode when the conductor approaches or contacts the input surface, thereby detecting which position the conductor approaches or contacts.

(Low reflection film)

As shown in FIG. 2, the low-reflection film 60 has a base film 64 and a cured resin layer 66 formed on the surface of the base film 64, and the surface has a fine uneven structure including a plurality of convex portions 62.

The base film 64 includes a transparent film. Examples of the material of the base film 64 include glass, acrylic resin, polycarbonate, styrene resin, polyester, cellulose resin (triacetyl cellulose, etc.), polyolefin, and alicyclic polyolefin. Wait.

The cured resin layer 66 is a transparent film containing a cured product of an active energy ray-curable resin composition described later, and has a fine uneven structure including a plurality of convex portions 62 on the surface.

It is known that a fine concavo-convex structure (a so-called moth-eye structure) formed by arranging a plurality of convex portions 62 having a substantially conical shape, a pyramid shape, etc. continuously increases from the refractive index of air to the refractive index of the material The large refractive index effectively prevents reflection.

The fine uneven structure is preferably a fine uneven structure formed by transferring a plurality of pores of anodized aluminum described later. The fine concavo-convex structure formed by transferring multiple pores of anodized aluminum can exhibit good low reflectivity. In addition, it can be formed at a low cost and the area can be increased.

The average height H of the convex portion 62 is preferably 80 nm or more and 500 nm or less, more preferably 120 nm or more and 400 nm or less, and particularly preferably 150 nm or more and 300 nm or less. If the average height H of the convex portion 62 is 80 nm or more, the reflectance becomes sufficiently low, and the wavelength dependency of the reflectance is small. If the average height H of the convex portion 62 is 500 nm or less, the scratch resistance of the convex portion becomes good.

The average height H of the convex portion 62 is obtained by observing an electron microscope, measuring the distance between the top of the convex portion 62 and the bottom of the concave portion existing between the convex portions 62 at 50 locations, and averaging these values Value.

In terms of the sufficiently low reflectance of visible light, the period P of convex portions 62 (that is, the average interval between adjacent convex portions 62) P is equal to or less than the wavelength of visible light, that is, 400 nm or less. When the convex portions 62 are formed by transferring a plurality of pores of anodized aluminum, the period P of the convex portions 62 is about 100 nm, more preferably 200 nm or less, and particularly preferably 150 nm or less. In terms of ease of forming the convex portion 62, the period P of the convex portion 62 is preferably 20 nm or more.

The period P between the convex parts 62 is observed by an electron microscope, and the distance between the adjacent convex parts 62 (the distance from the center of the convex part 62 to the center of the adjacent convex part 62) is measured for 50 places, and these The value is averaged.

The aspect ratio of the convex portion 62 (average height H of the convex portion 62/period P of the convex portion 62) is preferably 0.8 or more and 5.0 or less, more preferably 1.2 or more and 4.0 or less, and particularly preferably 1.5 or more and 3.0 or less. If the aspect ratio of the convex portion 62 is 0.8 or more, the reflectance becomes sufficiently low. If the aspect ratio of the convex portion 62 is 5.0 or less, the scratch resistance of the convex portion 62 becomes good.

The shape of the convex portion 62 is preferably a shape in which the cross-sectional area of the convex portion in a direction orthogonal to the height direction continuously increases in the depth direction from the outermost surface, that is, the cross-sectional shape of the convex portion 62 in the height direction is triangular, trapezoidal, or bell-shaped Other shapes.

(Adhesive layer)

As the adhesive agent of the adhesive agent layer 44 and the adhesive agent layer 46, the well-known transparent adhesive agent for optical use, a transparent adhesive agent, etc. are mentioned.

<adhesive member>

The adhesive member 30 fixes the liquid crystal panel 20 and the touch panel 40.

The adhesive member 30 includes: a substrate 32; a second adhesive layer 34 laminated on one surface of the substrate 32; and a first adhesive layer 36 laminated on the other surface of the substrate 32 and a second adhesive layer 34 is in contact with the surface of the liquid crystal panel 20 on the side where the image is displayed, and the first adhesive layer 36 is in contact with the surface of the touch panel 40 on the side with the fine uneven structure, thereby bringing the liquid crystal panel 20 and the touch panel 40 into contact fixed.

The fixed position of the liquid crystal panel 20 and the touch panel 40 is not particularly limited as long as it can fix the liquid crystal panel 20 and the touch panel 40 without hindering the image from the liquid crystal panel 20, but it is preferably a liquid crystal panel 20 and the periphery of the touch panel 40.

5, the peeling force of the adhesive member 30 and the liquid crystal panel 20 and the peeling force of the adhesive member 30 and the touch panel 40 will be described. The adhesive member 30 is configured in such a manner that the breaking strength (W2′) of the second adhesive layer, the adhesive strength (W3′) of the second adhesive layer 34 and the substrate 32, and the first adhesive layer 36 Adhesion strength (W3) to the base material 32, breaking strength (W2) of the first adhesive layer, and adhesion strength (W1) of the first adhesive layer 36 and the touch panel 40, the second adhesive layer 34 and the liquid crystal The adhesive strength (W5) of the panel 20 is small, and the breaking strength (W4) of the base material 32 is greater than at least one of the adhesive strength (W3) and the adhesive strength (W1).

As described above, when the attachment positions of the touch panel 40 and the liquid crystal panel 20 are shifted when assembling the image display device 10, or either of the touch panel 40 and the liquid crystal panel 20 has a defect Next, it is necessary to separate the touch panel 40 from the liquid crystal panel 20 and assemble the image display device 10 again.

Because the breaking strength (W4) is less than the bonding strength (W1), bonding strength (W3), In the case of the next strength (W3') and the next strength (W5), if the touch panel 40 and the liquid crystal panel 20 are to be separated, the base material 32 is broken. Therefore, the broken substrate 32 and the second adhesive layer 34 remain on the surface of the liquid crystal panel 20, and the remaining broken substrate 32 and the first adhesive layer 36 remain on the surface of the touch panel 40. For example, in the case of using the adhesive member 30 including the nonwoven fabric or foamed polyurethane substrate 32, the broken nonwoven fabric or polyurethane and the second adhesive layer 34 remain on the liquid crystal panel 20. On the surface, the remaining broken nonwoven fabric or polyurethane and the first adhesive layer 36 remain on the surface of the touch panel 40.

When only the second adhesive layer 34 remains on the surface of the liquid crystal panel 20, or when only one adhesive layer 36 remains on the surface of the touch panel 40, a cloth impregnated with alcohol or the like can be used, which is relatively easy The second adhesive layer 34 or the first adhesive layer 36 is wiped off.

On the other hand, when the broken substrate 32 and the second adhesive layer 34 remain on the surface of the liquid crystal panel 20, or the broken substrate 32 and the first adhesive layer 36 remain on the surface of the touch panel 40 In this case, if it is intended to be wiped off with a cloth or the like impregnated with alcohol, fragments of the broken base material 32 may damage the surface of the liquid crystal panel 20 or the touch panel 40. In addition, a part of the broken base material 32 absorbs alcohol and the like, making it difficult to sufficiently remove the second adhesive layer 34 or the first adhesive layer 36. In particular, since the liquid crystal panel 20 is more expensive than the touch panel 40, it is desirable to minimize the removal of the adhesive layer or the substrate from the liquid crystal panel 20, and reuse it without damaging the surface.

However, the adhesive member 30 used in the present invention is configured in such a manner that the adhesive strength (W1) is smaller than the adhesive strength (W3), the adhesive strength (W3'), and the base material Strength (W4), and the base material strength (W4) is greater than at least one of the adhesive strength (W3') and the adhesive strength (W5). Therefore, if the touch panel 40 and the liquid crystal panel 20 are to be separated, the substrate 32 is not broken and the interface between the second adhesive layer 34 and the liquid crystal panel 20 is peeled off, so that the adhesive member 30 can be stuck to the state of the touch panel 40 side , The touch panel 40 and the liquid crystal panel 20 are easily separated. Therefore, the adhesive member 30 is less likely to remain on the liquid crystal panel 20 side. Even if it remains, it is the level of the trace (residue) of the second adhesive layer 34, so it can be easily removed, and the surface of the liquid crystal panel 20 can be prevented from being damaged during removal . In addition, even if the separation is not actually performed, it is easy to predict which surface of the touch panel 40 and the liquid crystal panel 20 the adhesive member 30 remains on, so that the adhesive member 30 can be more easily removed.

In addition, the adhesive member 30 used in the present invention is configured such that the breaking strength (W4) is greater than at least one of the adhesive strength (W3) and the adhesive strength (W1). Therefore, it is considered that if the adhesive member 30 remaining on the surface of the touch panel 40 is to be peeled off, the base material 32 is not broken, and is any one of the following (i) to (iii).

(i) When the bonding strength (W3), the bonding strength (W3'), and the bonding strength (W1) are the smallest, the bonding strength (W1) is peeled off at the interface between the first adhesive layer 36 and the touch panel 40.

(ii) When the adhesive strength (W3), the adhesive strength (W3'), and the adhesive strength (W1) are the smallest, the adhesive strength (W3) is peeled off at the interface between the first adhesive layer 36 and the substrate 32.

(iii) When the adhesive strength (W3), the adhesive strength (W3'), and the adhesive strength (W5) are the smallest, the adhesive strength 34 and the substrate 32 are the smallest Interface peeling.

In the case of (i) above, the adhesive member 30 is unlikely to remain on the surface of the touch panel 40, and even if it remains, it is the degree of the trace (residue) of the first adhesive layer 36. In the case of (ii), the first adhesive layer 36 remains on the surface of the touch panel 40. As described above, when only the first adhesive layer 36 remains on the surface of the touch panel 40, the first adhesive layer 36 can be wiped off using a cloth or the like impregnated with alcohol or the like. Therefore, in the case of (i) and (ii), the first adhesive layer 36 can be removed by wiping the surface of the peeled touch panel 40 with alcohol or the like. In particular, in the case of (i) above, it is only necessary to remove the trace of the first adhesive layer 36, so it can be more easily removed.

On the other hand, in the case of (iii) above, the first adhesive layer 36 and the base material 32 remain on the surface of the touch panel 40. The breaking strength (W4) is greater than at least one of the adhesive strength (W3) and the adhesive strength (W1), so it is considered that if the first adhesive layer 36 and the substrate 32 remaining on the surface of the touch panel 40 are to be peeled off, then The base material 32 is not broken, but is the following (iv) or (v).

(iv) When the adhesive strength (W1) is smaller than the adhesive strength (W3), the interface between the first adhesive layer 36 and the touch panel 40 is peeled off.

(v) When the adhesive strength (W3') is smaller than the adhesive strength (W1), it peels off at the interface between the first adhesive layer 36 and the substrate 32.

In the case of (iv) above, the adhesive member 30 is unlikely to remain on the surface of the touch panel 40, and even if it remains, it is the degree of the trace (residue) of the first adhesive layer 36. In addition, in the case of (v) above, the first adhesive layer 36 remains on the touch The surface of the control panel 40. Therefore, as in the case of (i) and (ii) above, the first adhesive layer 36 can be removed by wiping the surface of the touch panel 40 after peeling with alcohol or the like.

The breaking strength (W4) is preferably greater than the adhesive strength (W3) and the adhesive strength (W1). In addition, the breaking strength (W4) is preferably greater than the adhesive strength (W3').

Furthermore, the adhesive strength (W1) is preferably smaller than the adhesive strength (W3) and the adhesive strength (W3'). If the adhesive strength (W1) is smaller than the adhesive strength (W3) and the adhesive strength (W3'), it is said (i) when the adhesive member 30 is peeled off from the touch panel 40, so the adhesive member 30 is less likely to remain on the touch Even if the surface of the panel 40 remains, the first adhesive layer 36 has traces (residues) to the extent that the first adhesive layer 36 can be easily removed.

Therefore, the adhesive member 30 is preferably the adhesive strength (W1), the adhesive strength (W3), the adhesive strength (W3'), the adhesive strength (W5), the breaking strength (W4), the adhesive strength (W5) is the smallest, and then the adhesive strength (W1) is small, and the breaking strength (W4) is the largest. That is, it is preferable to satisfy the relationship of "adhesion strength (W5)<adhesion strength (W1)<adhesion strength (W3), and adhesion strength (W3')<breaking strength (W4)".

Furthermore, the relationship between the adhesive strength (W3) and the adhesive strength (W3') is not particularly limited, and the adhesive strength (W3) and the adhesive strength (W3') may be the same value, or the adhesive strength (W3) may be large , Or the bonding strength (W3') may be large.

That is, in the present invention, the breaking strength W4 of the base material 32 is F1, the peeling force of the touch panel 40 and the adhesive member 30 is F2, and the peeling force of the liquid crystal panel 20 and the adhesive member 30 is F3. In the case of F3<F2<F1 The way the system is established constitutes a laminate.

Thus, according to the present invention, the liquid crystal panel 20 and the touch panel 40 fixed by the adhesive member 30 can be easily separated. In addition, when the adhesive member 30 remaining on the surface of the touch panel 40 is peeled off, the base material 32 is not easily broken, so that even if the first adhesive layer 36 remains on the surface of the touch panel 40, it can be easily removed.

Furthermore, when the second adhesive layer 34 or the first adhesive layer 36 remains on the surfaces of the liquid crystal panel 20 and the touch panel 40, these can be wiped off using ethanol, isobutanol, isopropanol, etc. .

Next, the strength (W5) is preferably 1 N/10 mm or more and 13 N/10 mm or less. By setting the adhesive strength (W5) to 1 N/10 mm or more, the liquid crystal panel 20 and the touch panel 40 can be sufficiently fixed. On the other hand, by setting the adhesive strength (W5) to 13 N/10 mm or less, the liquid crystal panel 20 and the touch panel 40 can be easily separated.

Next, the strength (W5) is obtained in accordance with Japanese Industrial Standards (JIS) Z 0237:2009 (International Standardization Organization (ISO) 29862 and ISO 29863). Specifically, the force required when peeling the adhesive member 30 at 180° relative to the surface of the liquid crystal panel 20 after peeling the adhesive member 30 against the surface of the liquid crystal panel 20 on the image display side (peeling) Force).

The subsequent strength (W1) is preferably 3 N/10 mm or more and 14 N/10 nm or less (wherein the adhesive strength (W1) is greater than the adhesive strength (W5)). By setting the bonding strength (W1) to 3N/10mm or more, the liquid crystal panel 20 and the touch The panel 40 is sufficiently fixed. On the other hand, by setting the adhesive strength (W1) to 14 N/10 mm or less, the liquid crystal panel 20 and the touch panel 40 can be easily separated. In addition, the adhesive member 30 can be easily removed from the touch panel 40.

Next, the strength (W1) is more preferably 4N/10mm or more and 14N/10nm or less, more preferably 5N/10mm or more and 13.8N/10nm or less.

Next, the strength (W1) is obtained in accordance with JIS Z 0237:2009 (ISO 29862 and ISO 29863). Specifically, it is determined by measuring the force (peeling force) required when the adhesive member 30 is peeled off at 180° with respect to the surface of the low-reflection film 60 after the adhesive member 30 is closely attached to the low-reflection film 60.

The adhesive strength (W3), adhesive strength (W3'), and breaking strength (W4) are not particularly limited as long as the adhesive member 30 is within the above-mentioned configuration.

Next, the strength (W3) is obtained in accordance with JIS Z 0237:2009 (ISO 29862 and ISO 29863). Specifically, it is determined by measuring the force (peeling force) required when the second adhesive layer 34 of the adhesive member 30 is peeled off at 180° with respect to the surface of the base 32.

The adhesive strength (W3') is also obtained by measuring the force (peeling force) required when the first adhesive layer 36 is peeled off at 180° with respect to the surface of the base material 32.

The breaking strength (W4) is obtained by measuring the force (cutting force) required to stretch and cut the base material 32 in the thickness direction.

Furthermore, even if the cutting force is not measured, if the base material 32 of the adhesive member 30 is not broken when the adhesive member 30 is peeled from the touch panel 40, it can be determined that the breaking strength (W4) is greater than the adhesive strength (W3 ) And the following strength (W1).

The adhesive strength (W1), adhesive strength (W3), adhesive strength (W3'), adhesive strength (W5), and breaking strength (W4) can be, for example, according to the type of the substrate 32, or the second adhesive layer 34, the first The type of the adhesive in the adhesive layer 36 is adjusted.

The substrate 32 is not particularly limited as long as it has a breaking strength (W4) greater than at least one of the adhesive strength (W3) and the adhesive strength (W1), and examples thereof include polyethylene terephthalate. Ester substrate (PET (polyethylene terephthalate) substrate), polycarbonate substrate, etc.

As the adhesive of the second adhesive layer 34 and the first adhesive layer 36, as long as the adhesive strength (W5) is smaller than the adhesive strength (W3'), adhesive strength (W3), and adhesive strength (W1), then There is no particular limitation, and examples thereof include acrylic adhesives, urethane adhesives, silicone adhesives, and rubber adhesives.

In addition, the type of adhesive may be changed according to the second adhesive layer 34 and the first adhesive layer 36, or the same type of adhesive may be used.

Examples of the adhesive include (meth)acrylic adhesives, urethane adhesives, synthetic rubber adhesives, natural rubber adhesives, and silicone adhesives, which can be preferably used ( A meth)acrylic adhesive composition, which is an acrylic copolymer containing (meth)acrylic acid ester alone or a copolymer of (meth)acrylic acid ester and other monomers as a raw material polymer, and if necessary Among them, additives such as tackifying resin and cross-linking agent are formulated.

Examples of (meth)acrylates having 1 to 12 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate. , Third butyl (meth)acrylate, n-hexyl (meth)acrylate, (meth) Mono-octyl acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and other monomers can be used One or more of these. Among them, (meth)acrylates having 4 to 12 carbon atoms in the alkyl group are preferred, and (meth)acrylates having a linear or branched structure having 4 to 8 carbon atoms are more preferred. In particular, n-butyl (meth)acrylate is easy to ensure adhesion to the adherend, and is excellent in cohesion or resistance to sebum.

The content of the (meth)acrylate having 1 to 12 carbon atoms in the acrylic copolymer is preferably 80% by mass or more and 98.5% by mass or less, more preferably 90% by mass in the monomer component constituting the acrylic copolymer Above and below 98.5 mass%.

In addition, the acrylic copolymer used in the present invention can copolymerize a highly polar vinyl monomer, and examples of the highly polar vinyl monomer include a vinyl monomer having a hydroxyl group, a vinyl monomer having a carboxyl group, and an amide. One or more of these vinyl monomers may be used.

As the monomer having a hydroxyl group, for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-(meth)acrylic acid can be used. Hydroxy-containing (meth)acrylates such as hydroxyhexyl ester.

As the vinyl monomer having a carboxyl group, acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth)acrylic acid dimer, crotonic acid, ethylene oxide modified succinic acrylate, etc. can be used. Among them, acrylic acid is preferably used as a copolymerization component.

In addition, examples of the monomer having an amide group include N-vinylpyrrolidone, N-vinylcaprolactam, acrylmorpholine, acrylamide, and N,N-dimethylacrylamide. Wait.

Examples of other highly polar vinyl monomers include sulfonic acid group-containing monomers such as vinyl acetate, ethylene oxide-modified succinic acrylate, and 2-acrylamide-2-methylpropanesulfonic acid.

The content of the highly polar vinyl monomer is preferably 1.5% by mass or more and 20% by mass or less in the monomer components constituting the acrylic copolymer, more preferably 1.5% by mass or more and 10% by mass or less, and still more preferably 2% by mass % To 8% by mass. By containing the highly polar vinyl monomer in the above range, it is easy to adjust the cohesive force, holding force, and adhesiveness of the adhesive to a preferred range.

Furthermore, in the case of using an isocyanate-based crosslinking agent as the crosslinking agent, the vinyl monomer having a functional group reacted therewith is preferably a hydroxyl group-containing vinyl monomer, and particularly preferably is (meth)acrylic acid 2-hydroxyethyl, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate. The content of the hydroxyl group-containing vinyl monomer that reacts with the isocyanate-based crosslinking agent is preferably 0.01% by mass or more and 1.0% by mass or less, and particularly preferably 0.03% by mass or more and 0.3% by mass of the monomer component constituting the acrylic copolymer. %the following.

The acrylic copolymer can be obtained by copolymerization using a known polymerization method such as solution polymerization method, bulk polymerization method, suspension polymerization method, emulsion polymerization method, etc. In terms of the water resistance of the adhesive, the solution polymerization method or Block polymerization method. The method of initiating the polymerization can also be arbitrarily selected as follows: the use of peroxides such as benzoyl peroxide or lauryl peroxide, and azo-based thermal polymerization initiators such as azobisisobutyronitrile Starting method; or by using photopolymerization initiators such as acetophenone series, benzoin ether series, benzoyl ketal series, acetyl phosphine oxide series, benzoin series, benzophenone series, etc. The starting method of external irradiation; or the method by electron beam irradiation.

Regarding the molecular weight of the acrylic copolymer, the weight average molecular weight in terms of standard polystyrene measured by gel permeation chromatography (GPC) is 400,000 or more and 3 million or less, preferably More than 800,000 and less than 2.5 million.

In order to improve the adhesion to the adherend or the surface adhesion strength, it is preferable to use a tackifying resin in the acrylic adhesive composition used in the present invention. Examples of the tackifying resin include rosin-based, polymerized rosin-based, polymerized rosin-ester-based, rosin-phenol-based, stabilized rosin-ester-based, heterogeneous rosin-ester-based, hydrogenated rosin-ester-based, terpene-based, terpene-phenol-based, Petroleum resins, (meth)acrylate resins, etc. When used in a latex-type adhesive composition, it is preferable to use a latex-type tackifying resin.

Regarding the compounding ratio when using an acrylic copolymer and a tackifying resin, the content of the tackifying resin relative to 100 parts by mass of the acrylic copolymer is preferably 5 parts by mass or more and 60 parts by mass or less, and more preferably 8 parts by mass or more And below 50 parts by mass. By setting the ratio of the two to this range, it becomes easy to ensure the adhesion to the adherend.

In order to improve the cohesive force of the adhesive layer, it is preferable to crosslink the adhesive in the acrylic adhesive composition. Examples of such crosslinking agents include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, metal chelate-based crosslinking agents, and aziridine-based crosslinking agents. Among them, the type of crosslinking agent added after completion of polymerization to allow the crosslinking reaction to proceed is preferred, and the isocyanate-based crosslinking agent and epoxy-based crosslinking agent, which are rich in reactivity with the (meth)acrylic copolymer, are preferred. The linking agent is more preferably an isocyanate-based crosslinking agent in terms of improving the adhesion to the foam base material.

Examples of the isocyanate-based crosslinking agent include toluene diisocyanate, naphthalene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and trimethylolpropane modification. Toluene diisocyanate, etc. Particularly preferred are trifunctional polyisocyanate compounds. Examples of the trifunctional polyisocyanate-based compound include toluene diisocyanate, these trimethylolpropane adducts, and triphenylmethane isocyanate.

As an index of the degree of crosslinking, the value of the gel fraction measured for the insoluble component after immersing the adhesive layer in toluene for 24 hours was used. The gel fraction is preferably 25% by mass or more and 70% by mass or less. If the range is more preferably 30% by mass or more and 60% by mass or less, and further preferably 30% by mass or more and 55% by mass or less, both the cohesiveness and the adhesion are good.

As additives for adhesives, plasticizers, softeners, antioxidants, flame retardants, glass or plastic fibers can be added to the adhesive composition as needed. Airbag. Particles, metal powders, metal oxides, metal nitrides and other fillers, pigments. Known ones such as colorants such as dyes, leveling agents, tackifiers, water repellents, and defoamers.

In addition, in the present invention, the low-reflection film 60 is provided on the surface of the touch panel 40 opposite to the liquid crystal panel 20. Regarding the low-reflection film 60 having a fine concavo-convex structure with a period P of 400 nm or less on the surface, the adhesive strength becomes larger when the adhesive layer is attached, compared to a film with a smooth surface. It is considered that the reason is that the convex portion of the fine uneven structure is pushed into the adhesive layer, and the contact area with the adhesive layer is greatly increased compared to a smooth film. That is, as shown in FIG. 1, by providing the low-reflection film 60 on the surface of the touch panel 40 opposite to the liquid crystal panel, not only the reflection at the interface is prevented but The visibility of the image display device is improved, and the adhesive strength (W1) can be made larger than the adhesive strength (W5).

In this way, the low-reflection film 60 is provided on the surface of the touch panel 40, whereby the adhesive strength can be adjusted without changing the type of adhesive or adjusting each adhesive strength according to the second adhesive layer 34 and the first adhesive layer 36 (W1 ) And adhesive strength (W5). Therefore, the image display device 10 can be assembled without minding the front and back surfaces of the adhesive member 30, and the image display device 10 can be manufactured with good yield.

<Manufacturing method of low reflection film>

The low-reflection film 60 is manufactured as follows using the manufacturing apparatus shown in FIG. 3, for example.

A surface of a roll-shaped mold 70 of anodized aluminum having a plurality of pores (not shown) formed on the surface, and a surface of a belt-shaped base film 64 that moves along the surface of the mold 70 while the mold 70 rotates In between, the active energy ray-curable resin composition 74 is supplied from the storage tank 72.

Between the mold 70 and the nip roller 78 whose clamping pressure is adjusted by the pneumatic cylinder 76, the base film 64 and the active energy ray curable resin composition 74 are nipped to make the active energy ray curable resin composition 74 is evenly distributed between the base film 64 and the mold 70, and is filled into the pores of the mold 70 at the same time.

In a state where the active energy ray curable resin composition 74 is sandwiched between the mold 70 and the base film 64, the active energy ray irradiation device 80 provided below the mold 70 is used to face the active energy from the base film 64 side The radiation curable resin composition 74 is irradiated with active energy rays, and the active energy ray curable resin composition 74 is cured by The hard resin layer 66 having a fine concavo-convex structure including a plurality of convex portions (not shown) is formed on the surface of the fine pores to which the surface of the mold 70 is transferred.

By peeling off the base film 64 with the cured resin layer 66 formed on the surface by the peeling roller 82, the low-reflection film 60 is obtained.

The active energy ray irradiation device 80 is preferably a high-pressure mercury lamp, a metal halide lamp, or the like. The cumulative light amount is preferably 100 mJ/cm ² or more and 10000 mJ/cm ² or less.

(Mold)

The mold 70 is a mold having anodized aluminum on its surface. The mold with anodized aluminum on the surface can be enlarged in size and easy to manufacture.

The anodized aluminum is a porous oxide film (alumite) of aluminum and has a plurality of pores on the surface.

A mold having anodized aluminum on its surface can be produced through the following steps (a) to (f), for example.

(a) Anodizing the aluminum substrate in the electrolyte to form an oxide film.

(b) The step of removing all the oxide film to form anodized pores.

(c) A step of anodizing the aluminum substrate again in the electrolytic solution to form an oxide film having pores at the point where pores are generated.

(d) The step of expanding the diameter of the pores.

(e) After step (d), in the electrolyte, anodizing again step.

(f) Repeat the steps (d) and (e).

Step (a):

As shown in FIG. 4, when the aluminum base 84 is anodized, an oxide film 88 having pores 86 is formed.

The purity of aluminum is preferably 99% or more, more preferably 99.5% or more, and particularly preferably 99.8% or more. If the purity of aluminum is low, a large uneven structure that scatters visible light due to segregation of impurities may be formed during anodization, or the regularity of pores obtained by anodization may decrease.

Examples of the electrolyte include sulfuric acid, oxalic acid aqueous solution, and phosphoric acid aqueous solution.

Step (b):

As shown in FIG. 4, all the oxide film 88 is temporarily removed and used as the anodized pore generation point 90, whereby the regularity of pores can be improved.

As a method of removing the oxide film, a method of dissolving and removing it in a solution that selectively dissolves the oxide film without dissolving aluminum can be cited. Examples of such a solution include a chromic acid/phosphoric acid mixed solution.

Step (c):

As shown in FIG. 4, if the aluminum substrate 84 from which the oxide film is removed is anodized again, an oxide film 88 having cylindrical pores 86 is formed.

Examples of the electrolyte include the same as in step (a).

Step (d):

As shown in FIG. 4, a process of enlarging the diameter of the fine hole 86 (hereinafter, "Enlargement of fine pores"). The pore size enlargement process is a process of expanding the diameter of the obtained pores by immersing in a solution in which the oxide film is dissolved to perform anodization. Examples of such a solution include a phosphoric acid aqueous solution of about 1 mol/L.

Step (e):

As shown in FIG. 4, if the anodization is performed again, a cylindrical pore 86 with a small diameter extending downward from the bottom of the cylindrical pore 86 is further formed.

Examples of the electrolyte include the same as in step (a).

Step (f):

As shown in FIG. 4, if the pore size enlargement process of step (d) and the anodization of step (e) are repeatedly performed, a mold 70 can be obtained that is formed with a diameter continuous from the opening in the depth direction Anodized aluminum (a porous oxide film of aluminum (aluminum-resistant aluminum)) with fine pores 86 having a shape that decreases sharply. Preferably, it ends with step (d).

The number of repetitions is preferably three or more in total, and more preferably five or more. If the number of repetitions is two or less, the diameter of the pores is discontinuously reduced, so the reflectance reduction effect of the cured resin layer 66 formed using anodized aluminum having such pores is insufficient.

The surface of the anodized aluminum can also be treated with a release agent to facilitate separation from the hardened resin layer 66. Examples of the treatment method include a method of applying a silicone resin or a fluoropolymer, a method of vapor-depositing a fluorine-containing compound, and a method of applying a fluorine-containing silane compound.

Examples of the shape of the fine hole 86 include a substantially conical shape, a pyramid shape, The cylindrical shape or the like is preferably a shape in which the cross-sectional area of the pores in the direction orthogonal to the depth direction continuously decreases from the outermost surface in the depth direction like a cone shape or a pyramid shape.

The average depth of the pores 86 is preferably 80 nm or more and 500 nm or less, more preferably 120 nm or more and 400 nm or less, and particularly preferably 150 nm or more and 300 nm or less.

The period of the pores 86 (the average interval between adjacent pores) is the wavelength of visible light or less, that is, 400 nm or less, preferably 200 nm or less, and more preferably 150 nm or less. The period interval of the fine holes 86 is preferably 20 nm or more.

The aspect ratio of the pores 86 (average depth of pores/period of pores) is preferably 0.8 or more and 5.0 or less, more preferably 1.2 or more and 4.0 or less, particularly preferably 1.5 or more and 3.0 or less.

The surface of the cured resin layer 66 formed by transferring the fine holes 86 as shown in FIG. 4 has a so-called moth-eye structure.

In addition, the method of manufacturing the mold is not limited to the above method, for example, the following step (b') may be performed instead of the step (b).

(b') The step of removing a part of the oxide film.

As shown in FIG. 4, the pores 86 of the oxide film 88 formed in step (a) have unevenness in intervals. Therefore, in step (b'), the irregularity is removed (i.e., the surface of the oxide film 88 is removed until the unevenness between the pores 86 disappears). The pore 86 exposed on the surface by the step (b') functions as the pore generation point 90 in the step (b).

As a method of removing a part of the oxide film 88, as long as chromic acid/phosphorus is used The acid mixture or phosphoric acid solution may dissolve the oxide film 88.

(Active energy ray-curable resin composition)

The active energy ray-curable resin composition contains a polymerizable compound and a polymerization initiator.

Examples of the polymerizable compound include monomers, oligomers, and reactive polymers having radical polymerizable bonds and/or cationic polymerizable bonds in the molecule.

The active energy ray-curable resin composition may contain a non-reactive polymer and an active energy ray sol-gel reactive composition.

Examples of the monomer having a radical polymerizable bond include monofunctional monomers and polyfunctional monomers.

Examples of monofunctional monomers include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate. , Second butyl (meth)acrylate, third butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, alkyl (meth)acrylate, Tridecyl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, phenoxyethyl (meth)acrylate, (meth) Group) Isobornyl acrylate, glycidyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, allyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, (meth) (Meth)acrylate derivatives such as hydroxypropyl acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate; (meth)acrylic acid; (meth) Acrylonitrile; styrene derivatives such as styrene and α-methylstyrene; (meth)acrylamide, N-dimethyl(meth)acrylamide, N-diethyl(meth)acrylamide Amine, dimethylaminopropyl (meth) acrylamide (Meth)acrylamide derivatives such as amines. These may be used alone or in combination of two or more.

Examples of polyfunctional monomers include ethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, triisocyanate ethylene oxide modified di(meth)acrylate, tri Ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,5-pentanediol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, polybutanediol di(meth)acrylate, 2,2-bis(4- (Meth)acryloyloxypolyethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxyethoxyphenyl)propane, 2,2-bis(4-( 3-(meth)acryloyloxy-2-hydroxypropoxy)phenyl)propane, 1,2-bis(3-(meth)acryloyloxy-2-hydroxypropoxy)ethane, 1,4-bis(3-(meth)acryloxy-2-hydroxypropoxy)butane, dimethyloltricyclodecane di(meth)acrylate, bisphenol A ethylene oxide Alkane adduct di(meth)acrylate, bisphenol A propylene oxide adduct di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth)acrylate, divinylbenzene , Methylene bisacrylamide and other difunctional monomers; pentaerythritol tri (meth) acrylate, trimethylol propane tri (meth) acrylate, trimethylol propane ethylene oxide modified three ( Methacrylate, trimethylolpropane propylene oxide modified triacrylate, trimethylolpropane ethylene oxide modified triacrylate, triisocyanate ethylene oxide modified tri(methyl ) Trifunctional monomers such as acrylate; condensation reaction mixture of succinic acid/trimethylolethane/acrylic acid, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate, di-trimethylol Propane tetraacrylate, tetramethylol methane tetra(meth)acrylate and other tetrafunctional monomers; difunctional acrylic urethane, di Polyester acrylates with higher functions. These may be used alone or in combination of two or more.

Examples of the monomer having a cationic polymerizable bond include monomers having an epoxy group, oxetanyl group, oxazolyl group, and vinyloxy group, and particularly preferred are monomers having an epoxy group.

Examples of oligomers or reactive polymers include unsaturated polyesters such as condensates of unsaturated dicarboxylic acids and polyols; polyester (meth)acrylates, polyether (meth)acrylates, Polyol (meth)acrylate, epoxy (meth)acrylate, carbamate (meth)acrylate, cationic polymerizable epoxy compound, the monomer having a radical polymerizable bond in the side chain Alone or copolymerized polymers.

Examples of non-reactive polymers include acrylic resins, styrene resins, polyurethanes, cellulose resins, polyvinyl butyral, polyester, and thermoplastic elastomers.

Examples of the active energy ray sol-gel reactive composition include alkoxysilane compounds and alkyl silicate compounds.

Examples of the alkoxysilane compound include compounds of the following formula (1).

R ¹¹ _x Si(OR ¹² ) _y … (1).

Among them, R ¹¹ and R ¹² each represent an alkyl group having 1 to 10 carbon atoms, and x and y represent integers satisfying the relationship of x+y=4.

Examples of alkoxysilane compounds include tetramethoxysilane and tetra- Isopropoxy silane, tetra-n-propoxy silane, tetra-n-butoxy silane, tetra-second butoxy silane, tetra-third butoxy silane, methyl triethoxy silane, methyl Tripropoxysilane, methyltributoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, trimethylethoxysilane, trimethylmethoxysilane, trimethyl Propyloxysilane, trimethylbutoxysilane, etc.

Examples of the alkyl silicate compound include compounds of the following formula (2).

R ²¹ O[Si(OR ²³ )(OR ²⁴ )O] _z R ²² …(2).

Among them, R ²¹ to R ²⁴ each represent an alkyl group having 1 to 5 carbon atoms, and z represents an integer of 3 to 20.

Examples of the alkyl silicate compound include methyl silicate, ethyl silicate, isopropyl silicate, n-propyl silicate, n-butyl silicate, and n-pentyl silicate. , Acetyl silicate, etc.

In the case of using a photohardening reaction, examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ether, benzoin isopropyl ether, benzoin isobutyl ether, benzoyl benzophenone, benzophenone, and p-methyl Oxybenzophenone, 2,2-diethoxyacetophenone, α,α-dimethoxy-α-phenylacetophenone, methyl phenyl glyoxylate, benzophenone Carbonyl compounds such as ethyl phenyl glyoxylate, 4,4'-bis(dimethylamino) benzophenone, 2-hydroxy-2-methyl-1-phenylpropane-1-one; Tetramethylthiuram monosulfide, tetramethylthiuram disulfide (tetramethylthiuram monosulfide) monosulfide) and other sulfur compounds; 2,4,6-trimethylbenzyldiphenylphosphine oxide, benzyldiethoxyphosphine oxide, etc. These may be used alone or in combination of two or more.

In the case of using an electron beam hardening reaction, examples of the polymerization initiator include benzophenone, 4,4′-bis(diethylamino)benzophenone, 2,4,6-tris Methyl benzophenone, methyl orthobenzoyl benzoate, 4-phenyl benzophenone, tertiary butyl anthraquinone, 2-ethyl anthraquinone, 2,4-bis Thioxanthones such as ethyl thioxanthone, isopropyl thioxanthone, 2,4-dichlorothioxanthone; diethoxyacetophenone, 2-hydroxy-2-methyl-1- Phenylpropane-1-one, benzoyl dimethyl ketal, 1-hydroxycyclohexyl-phenyl ketone, 2-methyl-2-morpholino(4-thiomethylphenyl)propane-1 -Acetophenone such as ketone, 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-butanone; benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether Other benzoin ethers; 2,4,6-trimethylbenzyl diphenylphosphine oxide, bis(2,6-dimethoxybenzyl)-2,4,4-trimethylpentyl Phosphine oxide, bis(2,4,6-trimethylbenzyl)-phenylphosphine oxide and other acetylphosphine oxide; methyl benzoyl carboxylate, 1,7-bisacridinyl heptane, 9- Phenylacridine, etc. These may be used alone or in combination of two or more.

When thermal curing reaction is used, examples of the thermal polymerization initiator include methyl ethyl ketone peroxide, benzoyl peroxide, dicumyl peroxide, tertiary butyl hydrogen peroxide, and cumene. Organic peroxides such as hydrogen peroxide, tert-butyl peroxyoctanoate, tert-butyl peroxybenzoate, lauryl peroxide; azo compounds such as azobisisobutyronitrile; A redox polymerization initiator formed by combining amines such as N,N-dimethylaniline, N,N-dimethyl-p-toluidine, and the like in an organic peroxide.

The active energy ray-curable resin composition may also contain additives such as antistatic agent, mold release agent, fluorine compound for improving antifouling property, fine particles, and a small amount of solvent, if necessary.

(Hydrophobic material)

When water repellency is required on the surface of the fine concave-convex structure (specifically, the contact angle of water is 90° or more), it is preferable to use an active energy ray-curable resin composition that can form a hydrophobic material. Composition of fluorine-containing compounds or silicone compounds.

Fluorine-containing compounds:

The fluorine-containing compound is preferably a compound having a fluoroalkyl group represented by the following formula (3).

-(CF ₂ ) _n -X...(3).

Wherein, X represents a fluorine atom or a hydrogen atom, n represents an integer of 1 or more, preferably 1-20, more preferably 3-10, and particularly preferably 4-8.

Examples of fluorine-containing compounds include fluorine-containing monomers, fluorine-containing silane compounds, fluorine-containing surfactants, and fluorine-containing polymers.

Examples of the fluorine-containing monomers include fluoroalkyl substituted vinyl monomers and fluoroalkyl substituted ring-opening polymerizable monomers.

Examples of the fluoroalkyl-substituted vinyl monomer include fluoroalkyl-substituted (meth)acrylate, fluoroalkyl-substituted (meth)acrylamide, fluoroalkyl-substituted vinyl ether, and fluoroalkane Substituted styrene.

Examples of the fluoroalkyl substituted ring-opening polymerizable monomer include fluoroalkyl substituted epoxy compounds, fluoroalkyl substituted oxetane compounds, and fluoroalkyl substituted oxazoline compounds.

The fluorine-containing monomer is preferably a fluoroalkyl substituted (meth)acrylate, and particularly preferably a compound of the following formula (4).

CH ₂ =C(R ⁴¹ )C(O)O-(CH ₂ ) _m -(CF ₂ ) _n -X…(4).

Among them, R ⁴¹ represents a hydrogen atom or a methyl group; X represents a hydrogen atom or a fluorine atom; m represents an integer of 1 to 6, preferably 1 to 3, more preferably 1 or 2; n represents an integer of 1 or more, preferably It is 1~20, more preferably 3~10, especially 4~8.

The fluorine-containing silane compound is preferably a fluoroalkyl-substituted silane compound, and particularly preferably a compound of the following formula (5).

(R ^f ) _a R ⁵¹ _b SiY _c …(5).

R ^f represents a C1-C20 fluorine-substituted alkyl group which may contain more than one ether bond or ester bond. Examples of R ^f include: 3,3,3-trifluoropropyl, tridecyl-1,1,2,2-tetrahydrooctyl, 3-trifluoromethoxypropyl, and 3-trifluoroethyl Acyloxypropyl, etc.

R ⁵¹ represents an alkyl group having 1 to 10 carbon atoms. Examples of R ⁵¹ include methyl, ethyl, and cyclohexyl.

Y represents a hydroxyl group or a hydrolyzable group.

Examples of the hydrolyzable group include alkoxy groups, halogen atoms, R ⁵² C(O)O (wherein R ⁵² represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms), and the like.

Examples of alkoxy groups include methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, tertiary butoxy, pentoxy, hexoxy, and cyclohexyl. Oxygen, heptyloxy, octyloxy, 2-ethylhexyloxy, nonyloxy, decyloxy, 3,7-dimethyloctyloxy, lauryloxy, etc.

Examples of halogen atoms include Cl, Br, and I.

Examples of R ⁵² C(O)O include CH ₃ C(O)O and C ₂ H ₅ C(O)O.

a, b, and c represent integers satisfying a+b+c=4 and a≧1, c≧1, preferably a=1, b=0, and c=3.

Examples of the fluorine-containing silane coupling agent include: 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, dimethyl-3,3, 3-trifluoropropylmethoxysilane, tridecylfluoro-1,1,2,2-tetrahydrooctyltriethoxysilane, etc.

Examples of the fluorine-containing surfactants include fluoroalkyl group-containing anionic surfactants and fluoroalkyl group-containing cationic surfactants.

Examples of fluoroalkyl group-containing anionic surfactants include fluoroalkyl carboxylic acids having 2 to 10 carbon atoms or metal salts thereof, disodium perfluorooctane sulfonyl glutamate, and 3-[ω-fluoro Alkyl(C ₆ ~C ₁₁ )oxy]-1-alkyl(C ₃ ~C ₄ )sodium sulfonate, 3-[ω-fluoroalkanoyl(C ₆ ~C ₈ )-N-ethylamine Base]-1-propane sodium sulfonate, fluoroalkyl (C ₁₁ ~C ₂₀ ) carboxylic acid or its metal salt, perfluoroalkyl carboxylic acid (C ₇ ~C ₁₃ ) or its metal salt, perfluoroalkyl ( C ₄ ~C ₁₂ )sulfonic acid or its metal salt, perfluorooctane sulfonic acid diethanolamide, N-propyl-N-(2-hydroxyethyl) perfluorooctane sulfonamide, perfluoroalkyl (C ₆ ~C ₁₀ )sulfonamide propyltrimethylammonium salt, perfluoroalkyl (C ₆ ~C ₁₀ )-N-ethylsulfonylglycine salt, monoperfluoroalkyl (C ₆ ~C ₁₆ ) Ethyl phosphate, etc.

Examples of the fluoroalkyl group-containing cationic surfactants include: fluoroalkyl group-containing aliphatic primary, secondary or tertiary amine acids; perfluoroalkyl (C ₆ ~C ₁₀ ) sulfonamide propyl trimethyl Aliphatic quaternary ammonium salts such as benzalkonium salts; benzalkonium salts; benzethonium chloride; pyridinium salts; imidazolium salts and the like.

Examples of the fluoropolymer include polymers of fluoroalkyl group-containing monomers, copolymers of fluoroalkyl group-containing monomers and poly(oxyalkylene) group-containing monomers, fluoroalkyl group-containing monomers and Copolymers of monomers that crosslink reactive groups. The fluorine-containing polymer may also be a copolymer with other polymerizable monomers.

The fluoropolymer is preferably a copolymer of a fluoroalkyl group-containing monomer and a poly(oxyalkylene) group-containing monomer.

The poly(oxyalkylene) group is preferably a group represented by the following formula (6).

-(OR ⁶¹ ) _p -...(6).

Among them, R ⁶¹ represents an alkylene group having 2 to 4 carbon atoms, and p represents an integer of 2 or more. Examples of R ⁶¹ include -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH(CH ₃ )CH ₂ -, -CH(CH ₃ )CH(CH ₃ )-, and the like.

The poly(oxyalkylene) group may include the same oxyalkylene unit (OR ⁶¹ ), or may include two or more oxyalkylene units (OR ⁶¹ ). The arrangement of two or more types of oxyalkylene units (OR ⁶¹ ) may be block or random.

Silicone compounds:

Examples of the silicone-based compound include (meth)acrylic modified silicone, silicone resin, and silicone-based silane coupling agent.

Examples of (meth)acrylic modified silicones include silicone (di)(meth)acrylates such as X-22-1602 (manufactured by Shin-Etsu Chemical Co., Ltd.).

(Hydrophilic material)

When hydrophilicity is required on the surface of the fine uneven structure (specifically, the contact angle of water is 25° or less), it is preferable to use 4 as the active energy ray-curable resin composition capable of forming a hydrophilic material. A composition containing a multifunctional (meth)acrylate more than functional, a hydrophilic (meth)acrylate more than two functional, and a monofunctional monomer as needed.

Examples of polyfunctional (meth)acrylates with four or more functions include di-trimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, and pentaerythritol ethoxytetra(methyl). The condensation reaction mixture of acrylic ester, dipentaerythritol hydroxypenta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, succinic acid/trimethylolethane/acrylic acid with a molar ratio of 1:2:4, Acrylic urethanes (made by Daicel Cytec): EBECRYL 220, EBECRYL1290, EBECRYL1290K, EBECRYL5129, EBECRYL8210, EBECRYL8301, KRM8200), polyether acrylates (Daicel Cytec) Manufacturing: EBECRYL81), modified epoxy acrylates (made by Daicel Cytec: EBECRYL3416), polyester acrylates (Dacelulyan Special company manufacturing: EBECRYL450, EBECRYL657, EBECRYL800, EBECRYL810, EBECRYL811, EBECRYL812, EBECRYL1830, EBECRYL845, EBECRYL846, EBECRYL1870) etc. These may be used alone or in combination of two or more.

As the polyfunctional (meth)acrylate having more than 4 functions, the polyfunctional (meth)acrylate having more than 5 functions is more preferable.

Examples of hydrophilic (meth)acrylates with more than two functions include Aronix M-240, Aronix M260 (manufactured by Toa Synthesis), NK ester (NK ester) AT-20E, NK ester ATM-35E (Manufactured by Shin Nakamura Chemical Co., Ltd.) and other multifunctional acrylates with long-chain polyethylene glycol, polyethylene glycol dimethacrylate, etc. These may be used alone or in combination of two or more.

In the polyethylene glycol dimethacrylate, the total of the average repeating units of the polyethylene glycol chain present in one molecule is preferably 6 to 40, more preferably 9 to 30, and particularly preferably 12 to 20. If the average repeating unit of the polyethylene glycol chain is 6 or more, the hydrophilicity is sufficient and the antifouling property is improved. If the average repeating unit of the polyethylene glycol chain is 40 or less, compatibility with polyfunctional (meth)acrylates having 4 or more functions is good, and the active energy ray-curable resin composition is not easily separated.

The monofunctional monomer is preferably a hydrophilic monofunctional monomer.

Examples of hydrophilic monofunctional monomers include M-20G, M-90G, and M-230G (manufactured by Shin Nakamura Chemical Co., Ltd.). The monofunctional (meth)acrylates having a polyethylene glycol chain equal to the ester group, Group) hydroxyalkyl acrylate is equivalent to a monofunctional (meth)acrylate having an hydroxy group in the ester group, a monofunctional acrylamide, methacrylamide propyltrimethylammonium methyl Cationic monomers such as alkyl sulfate, methacryloxyethyltrimethylammonium methyl sulfate, etc.

In addition, as monofunctional monomers, viscosity modifiers such as acryloyl morpholine and vinylpyrrolidone; adhesion promoters such as acryloyl isocyanates to improve adhesion to substrates, etc. can also be used .

The monofunctional monomer may be formulated in an active energy ray-curable resin composition in the form of one or two or more (co)polymerized low-polymerization polymers. Examples of polymers with a low degree of polymerization include M-230G (manufactured by Shin Nakamura Chemical Co., Ltd.) which is equivalent to monofunctional (meth)acrylates having a polyethylene glycol chain in the ester group and methacrylamidepropyltrimethyl 40/60 copolymerized oligomer of ammonium methyl sulfate (Mitsubishi Rayon Unitec Co., Ltd., MG polymer), etc.

<Manufacturing method of electrode substrate>

The electrode substrate 50 can be manufactured, for example, by vapor-depositing ITO or the like on the surface of the substrate body 52 to form a transparent conductive film, and then patterning it into a desired electrode pattern to make the first transparent electrode 54 and the second transparent Electrode 56.

<effect>

In the case of the image display device 10 described above, the surface of the touch panel 40 facing the liquid crystal panel 20 (image display device body) has a fine uneven structure with a period of 400 nm or less, so the liquid crystal panel 20 can be suppressed And the reflection of light on the opposite surface of the touch panel 40.

In addition, in the case of the image display device 10 described above, the liquid crystal panel 20 and the touch panel 40 are fixed by the adhesive member 30. thus, When necessary, the liquid crystal panel 20 and the touch panel 40 can be easily separated, and the adhesive member 30 can be easily removed from the surface of the touch panel 40.

Thereby, when the attachment positions of the touch panel 40 and the liquid crystal panel 20 are staggered, the fixed touch panel 40 and the liquid crystal panel 20 can be easily separated, so that the touch can be attached again in a predetermined positional relationship The panel 40 and the liquid crystal panel 20 do not discard the touch panel 40 and the liquid crystal panel 20.

In addition, after assembling the image display device 10, if any of the touch panel 40 or the liquid crystal panel 20 is defective, the fixed touch panel 40 and the liquid crystal panel 20 can be easily separated for easy replacement Defective components.

In this way, according to the image display device 10 described above, when the touch panel 40 having a fine uneven structure on the surface is used, when the liquid crystal panel 20 and the touch panel 40 are to be separated, it can be easily separated, and thus can be easily The adhesive member 30 is removed from the surface of the touch panel 40. Furthermore, according to the present invention, the image display device 10 with improved visibility can be manufactured with good yield.

<other forms>

Furthermore, the image display device of the present invention is not limited to the image display device 10 illustrated in the figure.

For example, the main body of the image display device is not limited to a liquid crystal panel, but may also be a plasma display panel, an organic electroluminescence (EL) display panel, a cathode ray tube (CRT), or the like.

In addition, the liquid crystal panel is not limited to the liquid crystal panel 20 illustrated in the figure, and may be a known display panel other than the liquid crystal panel 20.

In addition, the touch panel is not limited to an electrostatic capacitance type touch panel, and may also be a resistive film type touch panel.

In addition, the touch panel of the electrostatic capacitance method is not limited to the touch panel 40 of the illustrated example, and may be a known touch panel of the electrostatic capacitance method other than the touch panel 40.

In addition, a micro uneven structure may be provided on the input surface of the touch panel 40 by attaching the low-reflection film to the input surface of the touch panel 40 or the like.

In addition, the fine concave-convex structure is formed on the surface of the hardened resin layer of the low reflection film in the example shown in the figure, but it may be formed directly on the surface of the base film without providing the hardened resin layer, or may be formed on the surface of the low reflection film The surface of the touch panel 40. Among them, as shown in FIG. 3, it is preferable that low reflection is preferable in that the roller-shaped mold 70 can be used to efficiently form the fine concave-convex structure and the low-reflection film can be re-attached when the fine concave-convex structure is damaged. The surface of the cured resin layer of the film is formed with a fine uneven structure.

In addition, when a fine concavo-convex structure is formed on the surface of the touch panel 40 without adhering to the low-reflection film, the surface shape of the second transparent electrode of the touch panel 40 may be a fine concavo-convex structure.

In addition, the low-reflection film is not limited to those obtained by the above-mentioned manufacturing method, and may be formed on the surface of the base film by using a known method (nanoimprint, cutting, etching, etc.) The manufacturer of the fine uneven structure.

[Example]

Hereinafter, the present invention will be described more specifically by examples, but this The invention is not limited to these.

<Measurement of pores in anodized aluminum>

A part of the anodized aluminum was cut and platinum (platina) was vapor-deposited for 1 minute. The field emission type scanning electron microscope (manufactured by JEOL Ltd., JSM-7400F) was used to observe the profile under an acceleration voltage of 3.00kV. ，Measure the interval between pores and the depth of pores. Each measurement was performed on 50 places and the average value was obtained.

<Measurement of convex portion of hardened resin layer>

Platinum was vapor-deposited on the fracture surface of the cured resin layer for 10 minutes, the cross section was observed in the same manner as anodized aluminum, and the interval between the convex portions and the height of the convex portions were measured. Each measurement was performed on 50 places and the average value was obtained.

<Measurement of adhesive strength>

According to JIS Z 0237:2009 (ISO 29862 and ISO 29863), the adhesive strength was measured by the following method.

The adhesive member was cut to 25 mm × 150 mm, and a 2 kg roller was reciprocated once and attached to the object. After being left at a constant temperature of 23° C. for 30 minutes, the adhesive film was peeled off at 180° relative to the surface of the object, and the peeling position was measured. The required force (peeling force) and set it as the adhesive strength.

"Example 1"

<Manufacture of mold a>

The above steps (a) to (f) are performed to obtain a plate-shaped mold a having anodized aluminum formed on the surface, the anodized aluminum having a period (average interval) of 100 A plurality of pores with a substantially conical shape of nm and an average depth of 190 nm.

The mold a was immersed in a 0.1% by mass dilution solution of OPTOOL DSX (manufactured by Daikin Industries Co., Ltd.), air-dried overnight, and the surface of the anodized aluminum was treated with a mold release agent.

<Preparation of Active Energy Ray Curing Resin Composition A>

The following components were mixed to obtain active energy ray-curable resin composition A: dipentaerythritol hexaacrylate (manufactured by Shin Nakamura Chemical Industry Co., Ltd.): 25 parts by mass, and pentaerythritol triacrylate (manufactured by Daiichi Pharmaceutical Co., Ltd.): 25 parts by mass 、Ethylene oxide modified dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku): 25 parts by mass, polyethylene glycol diacrylate (manufactured by Shin Nakamura Chemical Industry Co., Ltd.): 25 parts by mass

1-Hydroxycyclohexyl phenyl ketone (made by BASF Japan, "Irgacure 184"): 1 part by mass, bis(2,4,6-trimethylbenzoyl) Phenylphosphine oxide (manufactured by BASF, Japan, "Irgacure819"): 0.5 parts by mass.

<Manufacture of low reflection film X>

An active energy ray-curable resin composition A was coated on the surface of the mold a, and a polyethylene terephthalate film having a thickness of 100 μm and a base material strength of 250 MPa was coated thereon.

Using an ultraviolet irradiator (Fusion Lamp D bulb), an ultraviolet ray is irradiated through the membrane at a cumulative light intensity of 1000 mJ/cm ² , after the active energy ray-curable resin composition A is cured, it is separated from the mold a, and A low-reflection film X having a cured resin layer having a thickness of 7 μm formed on the surface, the cured resin layer having a fine uneven structure including a plurality of convex portions in a truncated cone shape on the surface.

The period (average interval) of the convex portions was 100 nm, and the average height of the convex portions was 180 nm.

(Then the measurement of strength)

An adhesive member A having an acrylic adhesive layer (first adhesive layer and second adhesive layer) on both areas of the PET substrate was attached to the surface of the low-reflection film X on the side of the hardened resin layer, and the peeling force was measured. Let this be the adhesive strength of the first adhesive layer and the touch panel (W1). The results are shown in Table 1.

In addition, the adhesive member A was attached to a polycarbonate plate, and the peeling force was measured. In addition, as shown in FIG. 1, the liquid crystal panel used in this example has the first polarizing film 24 on the surface on the side where the image is displayed. The inventors of the present invention measured the peeling force using the same material as the outermost layer of the first polarizing film (the layer exposed when constructing the liquid crystal panel), and as a result, the peeling force measured using the polycarbonate plate was confirmed. Roughly the same. Therefore, in this example, the peeling force measured using the polycarbonate plate was regarded as the adhesive strength between the second adhesive layer and the liquid crystal panel (W5). The results are shown in Table 1.

<Manufacture of electrode substrate>

By using a sintered body material of 97% by mass of indium oxide and 3% by mass of tin oxide in a 0.4 Pa environment containing 98% by volume of argon gas and 2% by volume of tin oxide In the reactive sputtering method, an ITO film with a thickness of 30 nm is formed on both sides of a glass plate with a thickness of 1 mm.

Then, a photoresist patterned in stripes was applied to the surface of the ITO film, dried and cured, and then immersed in 25° C., 5 mass% hydrochloric acid for 1 minute to etch the ITO film on both sides. To form a transparent electrode obtained by patterning the ITO film.

(Manufacture of image display device)

A low-reflection film X, an electrode substrate, and a glass plate for cover glass with a thickness of 3 mm are sequentially stacked, and the detection part is connected to the transparent electrode to assemble a capacitive touch panel.

Then, using the same adhesive member A as the user used in the measurement of the next strength, the capacitive touch panel was attached to the backlight-attached panel with the low-reflection film X of the touch panel facing the liquid crystal panel The side of the liquid crystal panel on which the image is displayed is fixed and the image display device is assembled. Set the fixed position to the periphery of the touch panel and the liquid crystal panel.

In the obtained image display device, the touch panel and the liquid crystal panel were separated, and as a result, the base material of the adhesive member A did not break or the like, and the adhesive member A remained attached to the touch panel. It can be said that in the adhesive member A, the adhesive strength between the first adhesive layer and the substrate (W3), the adhesive strength between the second adhesive layer and the substrate (W3'), and the first adhesive layer The bonding strength with the touch panel (W1) and the bonding strength between the second adhesive layer and the liquid crystal panel (W5) are small. In addition, it can be said that the subsequent strength (W5) is smaller than the breaking strength of the base material (W4).

In addition, observation of the surface of the separated liquid crystal panel revealed that traces of the second adhesive layer (residual glue) could be slightly seen in the part where the adhesive member A was adhered, but it was easy to wipe the surface of the liquid crystal panel with ethanol Remove the residual glue.

In addition, the separation of the touch panel and the liquid crystal panel was evaluated by the following evaluation criteria. The results are shown in Table 1.

(Peeling off of LCD panel and touch panel)

A: The adhesive member is attached to the surface of the touch panel, and the residual glue on the surface of the liquid crystal panel can be easily removed.

B: The adhesive member is attached to the surface of the touch panel, but the residual glue on the surface of the liquid crystal panel cannot be removed.

C: The adhesive member is attached to the surface of the liquid crystal panel.

Then, the adhesive member A is peeled off from the touch panel. As a result, the base material of the adhesive member A is not broken, and the adhesive member A can be peeled off from the touch panel. From this, it can be said that in the adhesive member A, the breaking strength (W4) is at least greater than the subsequent strength (W1). In addition, it can be said that the adhesive strength (W1) is smaller than the adhesive strength (W3) and the adhesive strength (W3').

In addition, the surface of the touch panel after peeling was observed. As a result, traces (residual glue) of the first adhesive layer were slightly visible in the part where the adhesive member A was attached, but it was possible to wipe the surface of the touch panel with ethanol Remove residual glue easily.

In addition, the peeling of the adhesive member from the touch panel and the residue of the touch panel after peeling were evaluated by the following evaluation criteria. The results are shown in Table 1. In addition, "TP" in the table is the abbreviation of touch panel.

(Peeling of the adhesive member from the touch panel)

A: The substrate is not broken, and the adhesive member can be peeled from the surface of the touch panel.

B: The substrate is broken, or the adhesive member cannot be peeled from the surface of the touch panel.

(Residual glue of touch panel)

A: The residual glue can be easily removed by wiping the surface of the touch panel with ethanol.

B: Even if wiped with ethanol, it is difficult to remove the residual gum.

C: The broken substrate and the first adhesive layer remain on the surface of the touch panel, or the residual adhesive member itself, even if wiped with ethanol, these cannot be removed.

Then, the separated touch panel and the liquid crystal panel are bonded and fixed again using an adhesive member, and the image display device is assembled. It has been confirmed that the operation of the touch panel and the liquid crystal panel is no problem, and the reflection is suppressed to obtain a clear image.

"Example 2"

The adhesive member B on which the acrylic adhesive layer (the first adhesive layer and the second adhesive layer) with stronger adhesive force than the adhesive member A is formed on both sides of the PET substrate is the same as Example 1 except that Measure the strength of the adhesive. The results are shown in Table 1.

In addition, the image display device was assembled in the same manner as in Example 1, except that the adhesive member B was used.

For the obtained image display device, the touch panel and the liquid crystal panel were separated, and as a result, the base material of the adhesive member B did not break, and the adhesive member B remained attached to the touch panel. From this, it can be said that in the adhesive member B, the adhesive strength of the second adhesive layer and the substrate is higher than the adhesive strength of the first adhesive layer and the substrate (W3) (W3'), and the adhesive strength between the first adhesive layer and the touch panel (W1), and the adhesive strength between the second adhesive layer and the liquid crystal panel (W5) is small. In addition, it can be said that the subsequent strength (W5) is smaller than the breaking strength of the base material (W4).

In addition, when the surface of the separated liquid crystal panel was observed, residual glue was slightly confirmed in the portion to which the adhesive member B adhered, but the residual glue can be easily removed by wiping the surface of the liquid crystal panel with ethanol. The results are shown in Table 1.

Then, the adhesive member B is peeled off from the touch panel. As a result, the base material of the adhesive member B is not broken, and the adhesive member B can be peeled off from the touch panel. From this, it can be said that in the adhesive member B, the breaking strength (W4) is at least greater than the subsequent strength (W1). In addition, it can be said that the adhesive strength (W1) is smaller than the adhesive strength (W3) and the adhesive strength (W3').

In addition, the surface of the touch panel after peeling was observed. As a result, residual glue was slightly confirmed in the portion where the adhesive member B was attached. However, the residual glue can be easily removed by wiping the surface of the touch panel with ethanol. The results are shown in Table 1.

Then, the separated touch panel and the liquid crystal panel are bonded and fixed again using an adhesive member, and the image display device is assembled. It has been confirmed that the operation of the touch panel and the liquid crystal panel is no problem, and the reflection is suppressed to obtain a clear image.

"Example 3"

The adhesive member C on which the acrylic adhesive layer (the first adhesive layer and the second adhesive layer) with a stronger adhesive force than the adhesive member B is formed on both sides of the PET substrate is the same as Example 2 except that Measure the strength of the adhesive. The results are shown in Table 1.

In addition, the image display device was assembled in the same manner as in Example 1 except that the adhesive member C was used.

In the obtained image display device, the touch panel and the liquid crystal panel were separated. As a result, the base material of the adhesive member C did not break, and the adhesive member C remained attached to the touch panel. From this, it can be said that in the adhesive member C, the adhesive strength between the first adhesive layer and the substrate (W3), the adhesive strength between the second adhesive layer and the substrate (W3'), and the first adhesive layer The bonding strength with the touch panel (W1) and the bonding strength between the second adhesive layer and the liquid crystal panel (W5) are small. In addition, it can be said that the subsequent strength (W5) is smaller than the breaking strength of the base material (W4).

In addition, when the surface of the separated liquid crystal panel was observed, residual glue was slightly confirmed in the part to which the adhesive member C adhered. However, the residual glue can be easily removed by wiping the surface of the liquid crystal panel with ethanol. The results are shown in Table 1.

Then, the adhesive member C is peeled off from the touch panel. As a result, the base material of the adhesive member C is not broken, and the adhesive member C can be peeled off from the touch panel. From this, it can be said that in the adhesive member C, the breaking strength (W4) is at least greater than the subsequent strength (W1). In addition, it can be said that the adhesive strength (W1) is smaller than the adhesive strength (W3) and the adhesive strength (W3').

In addition, the surface of the touch panel after peeling was observed. As a result, residual glue was slightly confirmed in the portion to which the adhesive member C adhered. However, the residual glue can be easily removed by wiping the surface of the touch panel with ethanol. The results are shown in Table 1.

Then, the separated touch panel and the liquid crystal panel are bonded and fixed again using an adhesive member, and the image display device is assembled. Confirm touch panel, liquid There is no problem with the operation of the crystal panel, and the reflection is suppressed to obtain a clear image.

"Comparative Example 1"

Adhesive member C with the same acrylic adhesive layer (first adhesive layer and second adhesive layer) as the adhesive member A formed on both sides of a foamed polyolefin substrate with a substrate strength of 30 MPa, except for The adhesive strength was measured in the same manner as in Example 1, but in the measurement of the peeling force using the low-reflection film, the base material of the adhesive member C was broken and could not be measured. The results are shown in Table 1.

In addition, the image display device was assembled in the same manner as in Example 1 except that the adhesive member C was used.

In the obtained image display device, the touch panel and the liquid crystal panel were separated. As a result, the base material of the adhesive member C did not break, and the adhesive member C remained attached to the touch panel. From this, it can be said that in the adhesive member C, the adhesive strength between the first adhesive layer and the substrate (W3), the adhesive strength between the second adhesive layer and the substrate (W3'), and the first adhesive layer The bonding strength with the touch panel (W1) and the bonding strength between the second adhesive layer and the liquid crystal panel (W5) are small. In addition, it can be said that the subsequent strength (W1) is smaller than the breaking strength of the base material (W4).

In addition, when the surface of the separated liquid crystal panel was observed, residual glue was slightly confirmed in the part to which the adhesive member C adhered. However, the residual glue can be easily removed by wiping the surface of the liquid crystal panel with ethanol. The results are shown in Table 1.

Then, the adhesive member C is peeled off from the touch panel, and as a result, the substrate of the adhesive member C is broken, and a part of the broken substrate cannot be separated from the first adhesive layer from the touch panel. It can be said from this that in the adhesive member C, the breaking strength (W4) is less than Strength (W3), adhesive strength (W3'), and adhesive strength (W1).

In addition, it is desired to remove the broken substrate and the first adhesive layer remaining on the surface of the touch panel with ethanol, but these cannot be removed. The results are shown in Table 1.

Furthermore, the broken substrate and the first adhesive layer cannot be removed from the touch panel, so the separated touch panel and liquid crystal panel cannot be used to assemble the image display device.

"Comparative Example 2"

Adhesive members D formed with acrylic adhesive layers (the first adhesive layer and the second adhesive layer) that are the same as the adhesive member A on both sides of the nonwoven fabric substrate with a substrate strength of 8 MPa, in addition to The adhesive strength was measured in the same manner as in Example 1, but in the measurement of the peeling force using the low reflection film, the base material of the adhesive member D was broken and could not be measured. The results are shown in Table 1.

In addition, the image display device was assembled in the same manner as in Example 1, except that the adhesive member D was used.

In the obtained image display device, the touch panel and the liquid crystal panel were separated, and as a result, the base material of the adhesive member D did not break, and the adhesive member D remained attached to the touch panel. From this, it can be said that in the adhesive member D, the adhesive strength between the first adhesive layer and the substrate (W3), the adhesive strength between the second adhesive layer and the substrate (W3'), and the first adhesive layer The bonding strength with the touch panel (W1) and the bonding strength between the second adhesive layer and the liquid crystal panel (W5) are small. In addition, it can be said that the subsequent strength (W1) is smaller than the breaking strength of the base material (W4).

In addition, the surface of the separated liquid crystal panel was observed, and as a result, residual glue was slightly confirmed in the portion where the adhesive member D was attached, but the liquid crystal panel was wiped with ethanol The residual glue can be easily removed from the surface. The results are shown in Table 1.

Then, the adhesive member D is peeled off from the touch panel, and as a result, the base material of the adhesive member D is broken, and a part of the broken base material and the first adhesive layer cannot be separated from the touch panel. From this, it can be said that in the adhesive member D, the breaking strength (W4) is smaller than the bonding strength (W3), bonding strength (W3'), and bonding strength (W1).

In addition, it is desired to remove the broken substrate and the first adhesive layer remaining on the surface of the touch panel with ethanol, but these cannot be removed. The results are shown in Table 1.

Furthermore, the broken substrate and the first adhesive layer cannot be removed from the touch panel, so the separated touch panel and liquid crystal panel cannot be used to assemble the image display device.

"Comparative Example 3"

It is the same as in Example 1 except that the adhesive member E having an acrylic adhesive layer (first adhesive layer and second adhesive layer) with stronger adhesive force than the adhesive member C is formed on both sides of the PET substrate Measure the strength of the adhesive. The results are shown in Table 1.

In addition, the image display device was assembled in the same manner as in Example 1, except that the adhesive member E was used.

For the obtained image display device, the touch panel and the liquid crystal panel were separated, and as a result, the base material of the adhesive member E did not break or the like, and the adhesive member E remained attached to the touch panel. From this, it can be said that in the adhesive member E, the adhesive strength between the first adhesive layer and the substrate (W3), the adhesive strength between the second adhesive layer and the substrate (W3'), and the first adhesive layer The bonding strength with the touch panel (W1) and the bonding strength between the second adhesive layer and the liquid crystal panel (W5) are small. In addition, it can be said that the intensity (W5) is smaller than the breaking strength of the base material (W4).

In addition, when the surface of the separated liquid crystal panel was observed, residual glue was slightly confirmed in the portion to which the adhesive member E adhered. However, the residual glue can be easily removed by wiping the surface of the liquid crystal panel with ethanol. The results are shown in Table 1.

Then, the adhesive member E is peeled off from the touch panel. As a result, the base material of the adhesive member E is not broken, and the adhesive member E can be peeled off from the touch panel. From this, it can be said that in the adhesive member E, the breaking strength (W4) is at least greater than the subsequent strength (W1). In addition, it can be said that the adhesive strength (W1) is smaller than the adhesive strength (W3) and the adhesive strength (W3').

However, the surface of the touch panel after peeling was observed, and as a result, residual glue was confirmed in the portion where the adhesive member E adhered. In addition, even if the surface of the touch panel is wiped with ethanol, the residual glue cannot be removed. The results are shown in Table 1.

"Comparative Example 4"

An image display device was obtained in the same manner as in Example 1 except that a PET film for anti-scattering was used instead of a low-reflection film having a fine uneven structure. The reflection of the screen of the image display device is large, so it is blurred and the brightness value is as low as 4%. In addition, when the screen is pressed with a finger, interference fringes can also be confirmed on the front.

[Table 1]

[Industry availability]

The present invention provides an image display device with a touch panel, which can be easily separated when the image display device body and the touch panel are to be separated when a touch panel with a fine uneven structure on the surface is used, Furthermore, the adhesive member can be easily removed from the surface of the touch panel.

In addition, the image display device of the present invention can provide an image display device in which a touch panel is arranged on the front surface.

10: Image display device (image display device with touch panel)

12: Backlight

20: LCD panel (image display device body)

21: The first glass substrate

22: Second glass substrate

23: Liquid crystal layer

24: 1st polarizing film

25: 2nd polarizing film

30: Adhesive members

32: substrate

34: 2nd adhesive layer

36: 1st adhesive layer

40: Touch panel

42: Cover glass

44, 46: Adhesive layer

50: electrode substrate

52: substrate body

54: 1st transparent electrode

56: 2nd transparent electrode

60: Low reflection film

64: substrate film

66: hardened resin layer

S: input face

Claims (14)

A laminate including: a first member having a plurality of convex portions on a surface; a second member disposed opposite to the first member via a gap; and an adhesive member that connects the first member and the first member 2 members are fixed, and the average height of the plurality of convex portions is 80 nm or more and 500 nm or less, the average interval from adjacent convex portions is 20 nm or more and 400 nm or less, and the aspect ratio (average height/period) is 0.8 or more and 5.0 or less The adhesive member has: a substrate; a first adhesive layer laminated on one surface of the substrate; and a second adhesive layer laminated on the other surface of the substrate, and the first The adhesive layer is in contact with the surface of the first member on the side having the plurality of convex portions, and the second adhesive layer is in contact with the surface of the second member, thereby bringing the first member and the The second member is fixed; when the strength of the base material of the adhesive member is F1, the peeling force of the first member and the adhesive member is F2, and the second member and the adhesive member When the peeling force is F3, F1 to F3 satisfy the following relationship: F2<14N/10mm F3<F2<F1. The laminate according to item 1 of the patent application range, wherein the base material of the adhesive member has a breaking strength of 100 MPa or more. The laminate as described in item 1 of the patent application scope, in which the 1 The bonding strength between the member and the first adhesive layer is set to W1, the breaking strength of the first adhesive layer is set to W2, and the bonding strength between the base material and the first adhesive layer is set to W3. The bonding strength between the base material and the second adhesive layer is W3', the breaking strength of the second adhesive layer is W2', and the second member and the second 1 When the adhesive strength of the adhesive layer is set to W5, W5 is smaller than any of W1, W2, W2', W3, and W3'. The laminate according to item 1 of the patent application range, wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2 When the bonding strength of the base material and the first adhesive layer is W3, the W1 is smaller than either of the W2 and the W3. The laminate according to item 1 of the patent application range, wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2 When the bonding strength of the base material and the first adhesive layer is W3, the W2 is smaller than either of the W1 and the W3. The laminate as described in item 5 of the patent application scope, wherein the adhesive constituting the first adhesive layer and the second adhesive layer is soluble in water or alcohol. The laminate according to item 1 of the patent application range, wherein the bonding strength between the first member and the first adhesive layer is W1, and the breaking strength of the first adhesive layer is W2 , The bonding of the base material and the first adhesive layer When the intensity is W3, W3 is smaller than either W1 or W2. The laminate as described in item 7 of the patent application range, wherein the adhesive constituting the first adhesive layer and the second adhesive layer is soluble in water or alcohol. The laminate as described in item 3 of the patent application range, wherein the W5 is 1 N/10 mm or more and 13 N/10 mm or less. The laminate according to item 1 of the patent application range, wherein the adhesive strength between the first adhesive layer and the first member is 3 N/10 mm or more and 14 N/10 mm or less. The laminate according to item 1 of the scope of the patent application, wherein the adhesive constituting the first adhesive layer and the second adhesive layer is soluble in water or alcohol. The laminate as described in item 1 of the patent application range, wherein the first adhesive layer and the second adhesive layer are made of the same adhesive. The laminate according to item 1 of the patent application range, wherein the refractive index of the first member on the surface side having the plurality of convex portions continuously increases from the front ends of the plurality of convex portions toward the base. The laminated body according to any one of claims 1 to 13, wherein the first member is a touch panel, the second member is an image display device body, and the plurality of convex portions It is provided on the surface of the touch panel facing the body of the image display device.

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