TW201943553A - Method for manufacturing machined optical laminate with adhesive layer - Google Patents

Abstract

The present invention provides a method for simply manufacturing a machined optical laminate with an adhesive layer without causing a problem while minimizing cracks in an optical film. The method for manufacturing a machined optical laminate with an adhesive layer according to the present invention includes: forming a workpiece by laminating a plurality of optical laminates with adhesive layers; and machining the outer peripheral surface of a workpiece with the cutting blade of a cutting means brought into contact with the outer peripheral surface of the workpiece, the cutting means having a rotary shaft extending in the laminate direction of the workpiece and a cutting blade configured as the outermost diameter of a body rotating about the rotary shaft. The optical laminate with an adhesive layer comprises: an optical film; a first adhesive layer arranged on one side of the optical film; a first separator arranged on the first adhesive layer opposite the optical film; a second adhesive layer arranged on the other side of the optical film; and a second separator arranged on the second adhesive layer opposite the optical film. A storage elastic modulus G' at 25 DEG C in at least either the first adhesive layer or the second adhesive layer is 1.0 * 105 (Pa) to 2.5 * 105 (Pa), and the thickness of at least one of the adhesive layers is 50 [mu]m or greater.

Description

Method for manufacturing laminated optical laminated body with adhesive layer

The invention relates to a method for manufacturing an optical laminated body with an adhesive layer after cutting.

BACKGROUND OF THE INVENTION In order to realize image display and / or improve the image display performance, image display devices such as mobile phones and notebook personal computers use various optical laminates (such as polarizing plates). In recent years, it is also desirable to use an optical laminated body for automobile instrument panels, smart watches, and the like, and it is desirable to process the shape of the optical laminated body into a desired shape. However, there is a problem that cracks easily occur when processing an optical laminate. In particular, cracks are more noticeable when processed outside of a rectangular shape (profiled processing or non-linear processing).

Prior art document Patent document Patent document 1: Japanese Patent Laid-Open No. 2004-114205

SUMMARY OF THE INVENTION Problems to be Solved by the Invention The present invention has been made in order to solve the above-mentioned conventional problems. The main object of the present invention is to provide an adhesive layer that can be easily machined by cutting without cracking the optical film without causing defects. Method of optical laminated body.

Method for solving the problem The method for manufacturing an optical laminated body with an adhesive layer with a cutting process of the present invention includes the following steps: superposing a plurality of optical laminated bodies with an adhesive layer to form a workpiece; and The cutting edge of the cutting mechanism of the shaft and the cutting edge abuts the outer peripheral surface of the workpiece to cut the outer peripheral surface of the workpiece, and the rotating shaft of the cutting mechanism extends in the direction of lamination of the workpiece, and the cutting edge system is constituted by the The axis of rotation is the outermost diameter of the body that rotates at the center. The optical laminated body with an adhesive layer includes an optical film, a first adhesive layer, a first separating member, a second adhesive layer, and a second separating member. The first adhesive layer is disposed on one side of the optical film. The first separator is disposed on the opposite side of the first adhesive layer from the optical film, the second adhesive layer is disposed on the other side of the optical film, and the second separator is disposed on the second The side of the adhesive layer opposite to the optical film; and the storage elastic modulus G 'of at least one of the first adhesive layer and the second adhesive layer at 25 ° C is 1.0 × 10 ⁵ (Pa ) ~ 2.5 × 10 ⁵ (Pa), and the thickness of the at least one adhesive layer is 50 μm or more.
In another method for manufacturing an optical laminated body with an adhesive layer after the cutting process of the present invention, the optical laminated body with the adhesive layer includes: an optical film, and one side of the optical film starts from the optical film side. The third adhesive layer, the optical function film, the first adhesive layer and the first separator are disposed in this order, and the second adhesive layer and the second adhesive layer are sequentially disposed on the other side of the optical film from the optical film side. 2 separate pieces; and the storage elastic modulus G 'of the at least one of the first adhesive layer, the second adhesive layer, and the third adhesive layer at 25 ° C. is 1.0 × 10 ⁵ (Pa) ~ 2.5 × 10 ⁵ (Pa), and the thickness of the at least one adhesive layer is 50 μm or more.
In one embodiment, the manufacturing method includes non-linear cutting of an outer peripheral surface of the workpiece.
In one embodiment, the cutting mechanism is an end mill.
In one embodiment, the optical film is a polarizer or a polarizer.
In one embodiment, the optical function film includes at least one selected from a cellulose resin, a cycloolefin resin, and an acrylic resin.
In one embodiment, the breaking strength of the optical functional film is 35N or less.
In one embodiment, the cutting mechanism includes two or more cutting edges.
In one embodiment, the non-linear cutting includes forming a concave portion including a curved portion when the optical laminated body with the adhesive layer is viewed from above.
In one embodiment, the radius of the curved portion is 5 mm or less.

ADVANTAGE OF THE INVENTION According to this invention, it is a manufacturing method of the optical laminated body with an adhesive layer, and this method superimposes several pieces of optical laminated body with an adhesive layer to form a workpiece | work, and has a rotating shaft and a cutting edge The cutting edge of the cutting mechanism abuts the outer peripheral surface of the workpiece to cut the outer peripheral surface of the workpiece. The rotation axis of the cutting mechanism extends along the lamination direction of the workpiece, and the cutting edge system is configured to rotate around the rotation axis. The outermost diameter of the body; in this manufacturing method, by making the storage elastic modulus of at least one of the adhesive layers contained in the optical laminate within a predetermined range, and making the thickness above a predetermined value, the optical laminate can be suppressed Without the occurrence of cracks in the optical film contained in the body, a laminated optical body with an adhesive layer can be easily manufactured by cutting. This effect is particularly noticeable when the outer peripheral surface of the workpiece is processed non-linearly. The details are as follows. When multiple pieces of optical laminated body with adhesive layer are stacked to form a workpiece, and the workpiece is processed into a desired shape (such as a shape other than a rectangle), the processing method may be laser processing, blanking processing, etc. As a candidate method, a machining method (for example, an end mill) in which the cutting edge abuts the cutting surface in a lateral direction. However, the laser processing may adversely affect the optical characteristics of the obtained optical laminate, and the shape accuracy of the blanking process is insufficient. After attempting to use an end mill, the problem of cracks in optical films was newly discovered. The present inventors made trial and error on this new subject, and found that by setting the storage elastic modulus of at least one of the adhesive layers contained in the optical laminated body with the adhesive layer within a predetermined range, and making the thickness Above the predetermined value, the at least one adhesive layer can be spread to the cutting end surface during cutting, so as to absorb the damage caused by the cutting mechanism to the optical film, thereby suppressing cracks. That is, the present invention has solved the problems newly created in the technology of cutting the optical laminated body with an adhesive layer.

Forms for Implementing the Invention Specific embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited by these embodiments. In addition, the drawings are shown schematically for easy viewing, and the ratios of the length, width, thickness, and angle in the drawings are different from the actual ones.

The method for manufacturing an optical laminated body with an adhesive layer of the present invention includes the following steps: superimposing a plurality of optical laminated bodies with an adhesive layer to form a workpiece; and making the cutting of a cutting mechanism having a rotating shaft and a cutting edge The blade abuts the outer peripheral surface of the workpiece to cut the outer peripheral surface of the workpiece. The rotation axis of the cutting mechanism extends along the lamination direction of the workpiece, and the cutting edge system is configured as the outermost part of the body rotating around the rotation axis. path. The effect of the present invention is particularly noticeable during non-linear processing (profiled processing) of an optical laminate with an adhesive layer.

A. Optical Laminate with Adhesive Layer FIG. 1 is a schematic cross-sectional view illustrating an example of an optical laminate with an adhesive layer that can be used in the manufacturing method of the present invention. The optical laminated body 100 with an adhesive layer in the drawing example includes: an optical film 110, a first adhesive layer 130, a first separating member 140, a second adhesive layer 150 and a second separating member 160, and the first adhesive The layer 130 is disposed on one side of the optical film 110, the first separating member 140 is disposed on the opposite side of the first adhesive layer 130 from the optical film 110, and the second adhesive layer 150 is disposed on the other side of the optical film 110 The second separating member 160 is disposed on the opposite side of the second adhesive layer 150 from the optical film. When an optical laminated body with an adhesive layer is applied to an image display device, the first separating member 140 is arranged on the viewing side. When an optical laminate with an adhesive layer is actually used, the first separator 140 is peeled off and the cover glass is bonded to the first adhesive layer 130. In actual use, the optical laminated body with the adhesive layer will also peel off the second separator 140, and the second adhesive layer 150 can be used to attach the optical laminated body with the adhesive layer to the image display device (essentially Is the display unit).

FIG. 2 is a schematic cross-sectional view illustrating another example of an optical laminate with an adhesive layer that can be used in the manufacturing method of the present invention. The optical laminated body 101 with an adhesive layer in the drawing example further includes an optical function film 170 between the optical film 110 and the first adhesive layer 130, and the optical function film 170 is adhered to the third adhesive layer 180 through the third adhesive layer 180. Optical film 110.

Any appropriate surface treatment layer may be provided between the optical film 110 or the optical function film 170 and the first adhesive layer 130 according to the purpose. The surface treatment layer may be, for example, a hard coating layer, an anti-reflection layer, an anti-glare layer, or an anti-glare layer.

Hereinafter, specific configurations of the optical film 110, the first adhesive layer 130, the second adhesive layer 150, the third adhesive layer 180, and the optical function film 170 will be briefly described.

The optical film 110 may be any appropriate optical film that can be used for applications requiring cutting processing (especially non-linear processing). The optical film may be a single-layer film or a laminated body. Specific examples of the single-layer optical film include a polarizer and a retardation film. Specific examples of the optical film formed in the state of a laminated body include the following laminated body: a polarizing plate (represented as a laminated body of a polarizer and a protective film), a conductive film for a touch panel, a surface treatment film, and the corresponding purpose Such a single-layer optical film and / or a laminated body (e.g., a circular polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel) formed by appropriately stacking optical films composed of a laminated body.

In the embodiment of the present invention, the storage modulus G 'of at least one of the first adhesive layer 130, the second adhesive layer 150, and the third adhesive layer 180 at 25 ° C is 1.0 × 10 ⁵ (Pa). ~ 2.5 × 10 ⁵ (Pa), and the thickness of the at least one adhesive layer is above 50 μm. That is, among the adhesive layers (two in FIG. 1 and three in FIG. 2) of the optical laminate with the adhesive layer, only one adhesive layer can satisfy the above-mentioned storage elastic modulus and thickness ( This requirement is sometimes referred to hereinafter). Two layers of the adhesive layer may satisfy the requirement, and three layers of the adhesive layer may satisfy the requirement. When a part of the adhesive layer (two layers in the example in FIG. 1 and three layers in the example in FIG. 2) in the optical laminated body with the adhesive layer satisfies the requirement, the adhesive layer satisfying the requirement may be the first Any of the 1 adhesive layer, the 2nd adhesive layer, and the 3rd adhesive layer. For example, in the embodiment of FIG. 1, the adhesive layer satisfying the requirements may be the first adhesive layer, the second adhesive layer, or the first adhesive layer and the second adhesive layer, and the representative is the first adhesive layer.剂 层。 The agent layer. For another example, in the embodiment of FIG. 2, the adhesive layer satisfying the requirements may be a first adhesive layer, a second adhesive layer, a third adhesive layer, a first adhesive layer and a second adhesive layer, and a first adhesive layer. The adhesive layer and the third adhesive layer, the second adhesive layer and the third adhesive layer, or the first adhesive layer and the second adhesive layer and the third adhesive layer, and the representative is the first adhesive Floor. By optimizing the combination of the storage elastic modulus and the thickness of at least one of the adhesive layers in the adhesive layer included in the optical laminate with the adhesive layer, it is possible to cut the optical laminate with the adhesive layer (particularly In the case of non-linear processing), the adhesive layer can well absorb the damage caused by the cutting mechanism to the optical film, so it can significantly suppress the occurrence of cracks in the optical film. The storage elastic modulus of the adhesive layer that satisfies this requirement should be 1.1 × 10 ⁵ (Pa) to 2.3 × 10 ⁵ (Pa), and more preferably 1.2 × 10 ⁵ (Pa) to 2.0 × 10 ⁵ (Pa). The storage elastic modulus can be obtained by, for example, dynamic viscoelasticity measurement.

The thickness of the adhesive layer that satisfies this requirement is preferably 70 μm to 250 μm, and preferably 80 μm to 200 μm, and more preferably 100 μm to 150 μm.

As long as the adhesive constituting the adhesive layer that satisfies this requirement has adhesiveness and transparency that can be used in optical applications and has the desired storage elastic modulus described above, any appropriate adhesive can be used. Specific examples include an acrylic adhesive, a rubber adhesive, a silicone adhesive, a polyester adhesive, a urethane adhesive, an epoxy adhesive, and a polyether adhesive. By adjusting the type, amount, combination, and blending ratio of the monomer of the base resin forming the adhesive, and the blending amount, reaction temperature, and reaction time of the crosslinking agent, the desired storage elastic modulus can be prepared. Adhesive. The base resin of the adhesive may be used alone or in combination of two or more. From the viewpoints of transparency, processability, and durability, acrylic adhesives are preferred. The details of the adhesive are described in, for example, Japanese Patent Application Laid-Open No. 2014-115468, and this specification refers to the description in that publication.

As the adhesive constituting an adhesive layer other than the adhesive layer that satisfies the requirements, an adhesive commonly known in the industry can be used.

When the adhesive layer other than the adhesive layer satisfying the requirements is the first adhesive layer 130, the first adhesive layer may be an adhesive layer of a surface protection film. That is, any appropriate substrate (resin film) can be used instead of the first separating member 140, and the optical laminated body with the adhesive layer can also integrate the substrate and the adhesive layer in an integrated state (using a surface protective film) State) peeling off.

The optical function film 170 is a constituent element provided as needed. The optical function film is provided in order to provide the optical laminated body with an adhesive layer with a desired optical function according to a purpose. Examples of optical functional films include protective films for polarizers or polarizers, anti-reflection films, anti-glare films, and films for improving the visibility when viewed through polarized sunglasses. Examples of films used to improve the visibility when passing through polarized sunglasses include films with (ellipsoidal) circular polarization (e.g., λ / 4 plates), ultra-high retardation films (e.g., with retardation within 2000 nm and above) Of film).

The optical function film 170 may be formed of a resin film in one embodiment. Examples of the resin constituting the resin film include cellulose resin, cycloolefin resin, and acrylic resin. These can be used alone or in combination.

The breaking strength of the optical function film 170 is preferably 35N or less, and preferably 5N-30N, and more preferably 7N-28N. According to the embodiment of the present invention, even when an optical functional film having the above-mentioned low breaking strength is used, cracks can be suppressed satisfactorily. The breaking strength can be measured in accordance with JIS K 7161.

The above-mentioned embodiments can be appropriately combined. Therefore, it should be understood that all the combinations of the optical film, the first adhesive layer, the second adhesive layer, the third adhesive layer, and the optical function film (if any) are described in this specification. To those skilled in the art, it is self-evident that these arbitrary combinations can be applied to the present invention.

An example is given below to explain each step in the method for manufacturing an optical laminated body with an adhesive layer in a planar shape as shown in FIG. 3.

B. Forming the Work FIG. 4 is a schematic perspective view for explaining cutting processing, and the work 1 is shown in the figure. As shown in FIG. 4, a workpiece 1 is formed by stacking a plurality of optical laminated bodies with adhesive layers. When forming the workpiece, the optical laminated body with the adhesive layer is cut into any appropriate shape on behalf of the workpiece. Specifically, the optical laminated body with the adhesive layer can be cut into a rectangular shape, a shape similar to a rectangular shape, or an appropriate shape (for example, a circle) according to the purpose. The work 1 has outer peripheral surfaces (cutting surfaces) 1a, 1b facing each other, and outer peripheral surfaces (cutting surfaces) 1c, 1d orthogonal to these. The workpiece 1 should be clamped from above and below by a clamping mechanism (not shown). The total thickness of the workpiece should be 8mm ~ 20mm, and should be 9mm ~ 15mm, more preferably about 10mm. As long as it has the thickness, it can prevent damage caused by the pressing or cutting of the jaw mechanism. An optical lamination system with an adhesive layer overlays the workpiece to the stated total thickness. The number of the optical laminated body with the adhesive layer which comprises a workpiece | work can be 10-50 pieces, for example. The jaw mechanism (such as a clamp) may be made of a soft material or a hard material. When composed of a soft material, the hardness (JIS A) is preferably 60 ° to 80 °. If the hardness is too high, the indentation caused by the clamping mechanism may remain. If the hardness is too low, the position may be shifted due to the deformation of the fixture, which may cause insufficient cutting accuracy.

C. Cutting Processing Next, the outer peripheral surface of the workpiece 1 is cut by the cutting mechanism 20. Cutting is performed by contacting the cutting edge of the cutting mechanism with the outer peripheral surface of the workpiece 1 as described above. Cutting can be performed over the entire circumference of the outer peripheral surface of the workpiece, or it can be performed only at a predetermined position. In the following diagram example, cutting is performed over the entire circumference of the outer peripheral surface of the workpiece. In order to produce a planar optical laminated body with an adhesive layer as shown in FIG. 3, linear cutting is performed on the outer periphery of the workpiece, and chamfered portions 4a, 4b are formed on the two crotches of the outer periphery of the workpiece. A concave portion (a concave portion including a curved portion) 4c is formed in a central portion of the outer peripheral surface of the chamfered portions 4a and 4b. The cutting process is represented as shown in Figs. 4 and 5, which is the so-called end milling cutter process. That is, a predetermined position of the outer peripheral surface of the workpiece 1 is cut using the side surface of the cutting mechanism (end mill) 20. The cutting mechanism (end mill) 20 represents that a straight-edge end mill can be used.

Specifically, as shown in FIG. 5, the cutting mechanism 20 includes a rotating shaft 21 extending along the stacking direction (vertical direction) of the workpiece 1, and a cutting edge 22 configured to rotate around the rotating shaft 21 as a center. Of the outer diameter. In the illustrated example, the cutting edge 22 is configured to have an outermost diameter twisted along the rotation axis 21. The cutting edge 22 includes a cutting edge 22a, a rake surface 22b, and a flank surface 22c. The number of cutting edges 22 can be appropriately set according to the purpose. In the example shown in the figure, the cutting edge is composed of three pieces, but the number of edges can be one continuous, two, four, or five or more. The number of blades should be 2 or more. As long as the number of blades is two or more, it is possible to suppress adhesion of chips of the adhesive to the flank face 22c, and as a result, agglomeration can be suppressed. This result is contrary to the cutting process of the optical laminated body containing a general adhesive layer. That is, when the optical laminated body containing a general adhesive layer is cut, if the number of blades is large, chips may often accumulate on the rake face 22b and cause cutting failure. On the other hand, when the optical laminated body with an adhesive layer as in the present invention contains a soft adhesive layer, the one with a larger number of blades can suppress the elastic recovery of the optical laminated body (adhesive layer) with the adhesive layer. , And can prevent the chips of the adhesive from attaching to the flank face 22c. As a result, the chips of the adhesive on the flank surface can be prevented from coming into contact with the optical laminated body (adhesive layer) with the adhesive layer, so as a result, the agglomeration caused by the chips can be suppressed. In more detail, it is as follows: Generally speaking, the smaller the number of blades, the better the discharge of chips from the adhesive on the rake face, but on the other hand, the cutting resistance of each blade is larger, which will cause adhesion. The elastic recovery of the agent layer is large, so the chips of the adhesive will easily adhere to the flank surface. When cutting an optical laminated body containing a general adhesive layer, the discharge of the chips from the adhesive on the rake face has a large effect, so a smaller number of edges can suppress agglomeration. On the other hand, when the optical laminated body with an adhesive layer as in the present invention contains a soft adhesive layer, the elastic recovery of the adhesive layer has a large effect, so that a large number of blades can suppress agglomeration. In addition, the "caking" in this specification refers to the phenomenon that the optical laminated body with the adhesive layer in the workpiece is adhered to each other by the adhesive on the end surface, and the chips of the adhesive adhered to the end surface will promote the adhesion of the adhesive layer. The optical laminates are attached to each other. The angle of the cutting mechanism (the twist angle θ of the cutting edge in the example of the drawing) should be 45 ° ~ 75 °, and more preferably 45 ° ~ 60 °. As long as it is the edge angle, the chips of the adhesive can be easily discharged from the cutting edge, so that agglomeration can be suppressed as a result. After the cutting edge, the blade surface should be roughened. The roughening treatment can be performed by any appropriate treatment. Representative examples include sandblasting. By roughening the flank face, adhesion of the adhesive to the cutting edge can be suppressed, and as a result, agglomeration can be suppressed. By appropriately combining the number of blades, the roughening treatment of the flank face, and the adjustment of the blade angle, the agglomeration can be further suppressed by the aforementioned multiplication effect. That is, as long as the end mill has the above-mentioned configuration, it is possible to satisfactorily suppress agglomeration.

An example of cutting processing (non-linear processing) of the workpiece 1 will be described. First, as shown in FIG. 6 (a), the part where the chamfered part 4a of FIG. 3 is to be formed is chamfered, and then as shown in FIG. 6 (b), the part where the chamfered part 4b is to be formed is chamfered. Finally, as shown in FIG. 6 (c), a concave portion (a concave portion including a curved portion) 4c is formed by cutting. The radius of the curved portion is preferably 5 mm or less, and preferably 4 mm or less, and more preferably 3 mm or less. According to the embodiment of the present invention, cracks can be satisfactorily suppressed even if a curved portion having a small radius is formed. The formation order (cutting order) of the chamfered portions 4a and 4b and the recessed portions 4c is not limited. In addition, the non-linear processing as described above can be performed continuously with linear processing (for example, different from the example of the drawing, the entire circumference of the workpiece can be continuously cut), it can also be performed after a predetermined linear processing, or it can be performed in a straight line Perform before processing.

The cutting conditions can be appropriately set according to the desired shape. For example, the diameter of the cutting mechanism (end mill) 20 should be 3mm ~ 20mm. The rotation number of the cutting mechanism should be 1000 rpm to 60,000 rpm, and preferably 10,000 rpm to 40,000 rpm. The feed speed of the second cutting mechanism is preferably 500 mm / minute to 10000 mm / minute, and preferably 500 mm / minute to 2500 mm / minute. The number of times of cutting can be cut once, twice, three times or more. In addition, in the illustrated example, the chamfered portion 4a, the chamfered portion 4b, and the recessed portion 4c are sequentially formed, but these may be formed in any appropriate order.

In the above manner, an optical laminated body with an adhesive layer after cutting can be obtained.
Examples

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. The evaluation items of the examples are as follows.

(1) Breaking strength The breaking strength of optical functional films used in Examples and Comparative Examples was measured in accordance with JIS K 7161. Specifically, the film was cut into 100 mm in length and 10 mm in width to make a measurement sample, and then the measurement sample was stretched with a precision universal testing machine (manufactured by Shimadzu Corporation, product name "Autograph") to break, and the measurement was performed. Out of breaking strength. The tensile condition of the measurement sample was set to 300 mm / min.
(2) Storage elastic modulus For the adhesives used in the examples and comparative examples, the storage elastic modulus was determined from the dynamic viscoelasticity measurement. The dynamic viscoelasticity measurement was performed using a rheometer (dynamic viscoelasticity measuring device) (manufactured by TA Instruments, product name "ARES") under the following conditions.
Sample shape laminated 1mm
Temperature range -70 ℃ ~ 150 ℃
Heating rate 5 ° C / min.Measurement frequency 1Hz
Measurement fixture parallel plate (upper and lower flat plate clamping sample)
(3) Cracks For the optical laminates with adhesive layers (the optical laminates with all adhesive layers constituting the workpiece) prepared in the examples and comparative examples, a thermal shock of 200 cycles was performed at -40 ° C to 85 ° C. In the test, the occurrence of cracks in the concave portion (including the concave portion of the curved portion) was visually confirmed, and evaluation was performed according to the following criteria. The crack length is measured with an optical microscope.
No occurrence: The longest crack length is less than 100 μm. The longest crack length is greater than 100 μm.
(4) Processing accuracy Regarding the optical laminated body with an adhesive layer prepared in Example 2, Comparative Example 1, Reference Examples 1 and 2, the dimensions of the long and short sides were measured using a caliper and the processing accuracy was evaluated.
(5) Agglomeration For the optical laminated body with an adhesive layer prepared in Example 2, Comparative Example 1, Reference Examples 1 and 2, under the state of the workpiece after the cutting process, The stick was attached to the central part of the optical laminated body with an adhesive layer, it was picked up, and it evaluated based on the following criteria.
◎: The optical laminated body with the adhesive layer can be picked up one by one. ○: Although there may be cases where multiple optical laminated bodies with the adhesive layer are picked up at once, they can be dispersed into a piece by shaking ×: Pick up multiple pieces of optical laminate with adhesive layer at one time, and can't disperse them into pieces even if shaken

> Example 1>
The polarizer is obtained by using the following film (thickness: 12 μm): a long polyvinyl alcohol (PVA) resin film containing iodine and uniaxially extending in the longitudinal direction (MD direction). A third adhesive layer (thickness: 5 μm) was formed on one side of the polarizer, and a long optical function film (HC-TAC film) was laminated through the third adhesive layer to align the long sides of both sides. In addition, the HC-TAC film is a film having a hard coat (HC) layer (2 μm) formed on a triethyl cellulose (TAC) film (25 μm), and the TAC film is laminated on the polarizer side. A first adhesive layer is formed on the hard coat layer side of the polarizer / TAC film / HC layer laminate obtained, and a second adhesive layer is formed on the polarizer side, and a separator is attached to each of the adhesive layers. , And a long strip-shaped optical laminated body with an adhesive layer (a polarizing plate with an adhesive layer) was prepared. The storage modulus of the first adhesive layer was 1.2 × 10 ⁵ (Pa), and the thickness was 100 μm. The storage elastic modulus of the second adhesive layer was 2.7 × 10 ⁵ (Pa), and the thickness was 15 μm. The breaking strength of the HC-TAC film was 26N.

After punching the polarizer with the adhesive layer prepared in the above manner to a size of 5.7 inches (140 mm in length and 65 mm in width), a plurality of punched polarizers were laminated to make a workpiece (total thickness of about 10 mm). In a state in which the obtained workpiece is clamped by a clamp (clamp), an end mill is used to form a chamfered portion on two cymbals on the outer periphery of the workpiece, and an outer peripheral surface on which the chamfered portion is formed. A concave portion (a concave portion including a curved portion) is formed in a central portion of the central portion, and a polarizing plate with an adhesive layer after cutting processing as shown in FIG. 3 is obtained. The radius of the curved portion is 2.5 mm. Here, the number of blades of the end mill is three, and the blade angle (torsion angle) is 45 °. The feed speed of the end mill was 1500 mm / minute, and the number of rotations was 30,000 rpm.

The finally produced polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1.

> Example 2>
A polarizing plate with an adhesive layer was prepared in the same manner as in Example 1 except that the thickness of the first adhesive layer was set to 150 μm. This polarizing plate with an adhesive layer was cut in the same manner as in Example 1. The finally produced polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1. It also evaluates machining accuracy and agglomeration. The results are shown in Table 2.

> Example 3>
The storage elastic modulus of the first adhesive layer was set to 1.6 × 10 ⁵ (Pa), and the radius of the curved portion was set to 4.0 mm. Other than that, an adhesive-attached layer was prepared in the same manner as in Example 1. Polarizer. This polarizing plate with an adhesive layer was cut in the same manner as in Example 1. The finally produced polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1.

> Example 4>
A polarizing plate with an adhesive layer was prepared in the same manner as in Example 3, except that the thickness of the first adhesive layer was set to 150 μm. This polarizing plate with an adhesive layer was cut in the same manner as in Example 1. The finally produced polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1.

> Example 5>
A polarizing plate with an adhesive layer was prepared in the same manner as in Example 1 except that the thickness of the polarizer was set to 5 μm, and an HC-COP film was used instead of the HC-TAC film. In addition, the HC-COP film is a thin film having a hard coat (HC) layer (2 μm) formed on a cycloolefin (COP) film (25 μm), and the breaking strength is 9N. This polarizing plate with an adhesive layer was cut in the same manner as in Example 1. The finally produced polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1.

> Example 6>
A polarizing plate with an adhesive layer was produced in the same manner as in Example 5 except that the thickness of the first adhesive layer was set to 150 μm and the radius of the curved portion was set to 4.0 mm. This polarizing plate with an adhesive layer was cut in the same manner as in Example 1. The finally produced polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1.

> Comparative Examples 1 to 4>
Change the thickness of the polarizer, the optical function film (hence its breaking strength), the thickness of the first adhesive layer, the storage elastic modulus of the first adhesive layer, and / or the radius of the curved portion of the concave portion to Table 1 As shown, a polarizing plate with an adhesive layer after cutting was prepared in the same manner as in Example 1 except for the above. The prepared polarizing plate with an adhesive layer with a cutting process was used for the above-mentioned crack evaluation. The results are shown in Table 1. The comparative example 1 was also evaluated for machining accuracy and agglomeration. The results are shown in Table 2.

[Table 1]

> Reference Example 1: Review of Caking>
Except that the number of edges of the end mill was set to one, a polarizing plate with an adhesive layer after cutting was produced in the same manner as in Example 2. The obtained polarizing plate with an adhesive layer was used for the above evaluation of processing accuracy and agglomeration. The results are shown in Table 2.

> Reference Example 2: Review of Caking>
A polarizing plate with an adhesive layer after cutting was produced in the same manner as in Comparative Example 1 except that the number of edges of the end mill was set to one. The obtained polarizing plate with an adhesive layer was used for the above evaluation of processing accuracy and agglomeration. The results are shown in Table 2.

[Table 2]

>Evaluation>
As can be seen from Table 1, according to an embodiment of the present invention, in the method for manufacturing an optical laminated body with an adhesive layer after cutting, at least one of the adhesive layers contained in the optical laminated body with the adhesive layer is made. When the storage elastic modulus is within a predetermined range and the thickness is greater than a predetermined value, cracks in the optical film (especially cracks in the curved portion of the concave portion) can be significantly suppressed. As a result, cracks in the entire optical laminate with the adhesive layer can be suppressed. In addition, it can be seen from Table 2 that when the optical laminated body including the adhesive layer with the adhesive layer having a small storage elastic modulus (soft) is used for cutting processing, the larger the number of edges of the end mill, the more it can suppress agglomeration. On the other hand, in the case of cutting an optical laminated body with an adhesive layer containing a (hard) adhesive layer with a large storage elastic modulus, the smaller the number of edges of the end mill, the more it can suppress agglomeration.

Industrial Applicability The manufacturing method of the present invention can be applied to manufacturing an optical laminated body with an adhesive layer that needs to be subjected to cutting processing (especially non-linear processing). The optical laminated body with an adhesive layer prepared by the manufacturing method of the present invention can be applied to a special-shaped image display section represented by an automobile instrument panel and a smart watch.

1‧‧‧Workpiece

1a, 1b, 1c, 1d‧‧‧‧outer surface (cutting surface)

4a, 4b ‧‧‧ to corner

4c‧‧‧concave

20‧‧‧Cutting mechanism

21‧‧‧rotation axis

22‧‧‧ cutting edge

22a‧‧‧Blade

22b‧‧‧Front Face

22c‧‧‧flank

100‧‧‧ Optical laminate with adhesive layer

101‧‧‧ Optical laminated body with adhesive layer

110‧‧‧Optical film

130‧‧‧The first adhesive layer

140‧‧‧The first separation

150‧‧‧Second adhesive layer

160‧‧‧Second Split

170‧‧‧ Optical Functional Film

180‧‧‧3rd adhesive layer

FIG. 1 is a schematic cross-sectional view illustrating an example of an optical laminated body with an adhesive layer that can be used in the manufacturing method of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating another example of an optical laminate with an adhesive layer that can be used in the manufacturing method of the present invention.

FIG. 3 is a schematic plan view showing an example of the shape of an optical laminated body with an adhesive layer which can be obtained by the manufacturing method of the present invention.

Fig. 4 is a schematic perspective view for explaining cutting processing in the manufacturing method of the present invention.

Fig. 5 is a schematic diagram for explaining the structure of a cutting mechanism used in cutting processing in the manufacturing method of the present invention.

FIGS. 6 (a) to 6 (c) are schematic plan views illustrating a series of cutting processes in the manufacturing method of the present invention.

Claims (10)

A method for manufacturing a laminated optical laminated body with an adhesive layer includes the following steps: superimposing a plurality of laminated optical laminated bodies with an adhesive layer to form a workpiece; and a cutting mechanism having a rotating shaft and a cutting edge The cutting edge abuts the outer peripheral surface of the workpiece to cut the outer peripheral surface of the workpiece. The rotation axis of the cutting mechanism extends along the lamination direction of the workpiece, and the cutting edge system is configured as a body that rotates around the rotation axis. The outer diameter of the optical laminated body with the adhesive layer includes: an optical film, a first adhesive layer, a first separating member, a second adhesive layer and a second separating member, and the first adhesive layer is disposed on the On one side of the optical film, the first separator is disposed on the opposite side of the first adhesive layer from the optical film, the second adhesive layer is disposed on the other side of the optical film, and the second separator The storage elastic modulus G 'of at least one of the first adhesive layer and the second adhesive layer at the second adhesive layer opposite to the optical film is 1.0 × at 25 ° C. ^{10 5 (Pa) ~ 2.5 ×} 10 5 (Pa), and the at least one adhesive Thickness of the layer is 50μm or more. A method for manufacturing a laminated optical laminated body with an adhesive layer includes the following steps: superimposing a plurality of laminated optical laminated bodies with an adhesive layer to form a workpiece; and a cutting mechanism having a rotating shaft and a cutting edge The cutting edge abuts the outer peripheral surface of the workpiece to cut the outer peripheral surface of the workpiece. The rotation axis of the cutting mechanism extends along the lamination direction of the workpiece, and the cutting edge system is configured as a body that rotates around the rotation axis. The outer diameter of the optical laminated body with the adhesive layer includes: an optical film, and a third adhesive layer, an optical functional film, and a first adhesive layer which are sequentially disposed on the optical film side from the optical film side. An adhesive layer and a first separating member, and a second adhesive layer and a second separating member arranged in this order from the optical film side on the other side of the optical film; and the first adhesive layer and the second adhesive The storage elastic modulus G 'of at least one of the adhesive layer and the third adhesive layer at 25 ° C is 1.0 × 10 ⁵ (Pa) to 2.5 × 10 ⁵ (Pa), and the The thickness is 50 μm or more. The manufacturing method according to claim 1 or 2, further comprising: performing non-linear cutting on an outer peripheral surface of the workpiece. The manufacturing method according to any one of claims 1 to 3, wherein the cutting mechanism is an end mill. The manufacturing method according to any one of claims 1 to 4, wherein the optical film is a polarizer or a polarizing plate. The manufacturing method according to any one of claims 2 to 5, wherein the optical function film includes at least one selected from a cellulose-based resin, a cycloolefin-based resin, and an acrylic resin. The manufacturing method according to any one of claims 2 to 6, wherein the breaking strength of the optical function film is 35N or less. The manufacturing method according to any one of claims 1 to 7, wherein the cutting mechanism has two or more cutting edges. The manufacturing method according to any one of claims 3 to 8, wherein the non-linear cutting includes forming a concave portion including a curved portion when the optical laminated body with the adhesive layer is viewed from above. The manufacturing method according to claim 9, wherein the radius of the aforementioned curved portion is 5 mm or less.