JP2012056041A - Method of cutting adhesive optical filter for display, and method of manufacturing adhesive optical filter for display using this cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of cutting an adhesive optical filter for a display, by which problems of paste dirt of a lump of paste, burr, a deficit and the like caused when an optical filter having two or more independent adhesive layers is cut by punching in a prescribed size can be solved, and to provide a method of manufacturing the adhesive optical filter.SOLUTION: In the method of cutting the adhesive optical filter for the display, a punching blade B which has a cutting edge of ≤30° tip angle θ and whose surface is subjected to silicone treatment s is used when the adhesive optical filter 10 for the display in which a plurality of adhesive filters 3 each made of a filter body 1 and an adhesive layer 2 are layered and which has a plurality of independent adhesive layers by being isolated from each other via the filter body is punched and cut in a prescribed size. In the manufacturing method of the adhesive optical filter for a display, after the adhesive optical filter for the display is prepared, the cutting method is used.

Description

  The present invention relates to a cutting method and a manufacturing method of an optical filter with an adhesive layer disposed on the front surface of a display. In particular, the present invention relates to a cutting method and a manufacturing method in which an adhesive layer can be cut cleanly when cutting into a sheet of a predetermined size, and adhesive stains due to the adhesive and burrs and defects on the cut surface are unlikely to occur.

  Currently, an optical filter in which a plurality of filters are usually stacked, such as an electromagnetic wave shielding filter, a near infrared absorption filter, and an antireflection filter, is disposed on the front surface (side surface of the image observer) of a display such as a plasma display. Moreover, each filter is comprised from the filter main body and the adhesive layer, and the optical filter of the structure laminated | stacked by the adhesive layer which each has several required filters is known (patent document 1).

  Such an optical filter is manufactured in the form of a strip-shaped sheet, and then manufactured by cutting a sheet having a predetermined size according to the display shape to be applied by punching or the like.

Japanese Patent Laid-Open No. 11-12604

However, as shown in the cross-sectional view of FIG. 5, when the optical filter 10 with the adhesive layer is punched into a sheet having a predetermined shape and a predetermined size by the punching blade B, or from the sheet, the predetermined shape and Problems are likely to occur when punching into a predetermined size. That is, the adhesive moves from the cut surface of the pressure-sensitive adhesive layer 2 to the punching blade B and adheres, resulting in paste stains such as glue balls P. Furthermore, the adhesive adhered to the punching blade B moves to the optical filter 10. Adhering to the cut surface is likely to cause glue stains P that become paste balls P on the cut surface.
In addition, the cutting edge B may be cut with the punching blade B with the pressure-sensitive adhesive attached, or the end face may be roughened due to burrs Q or defects R on the cut surface of the optical filter 10. However, the place where these problems occur is a cut surface, which occurs at the outer peripheral portion of the optical filter that is a sheet, and is not a portion related to the internal image display.
In addition, various problems that occur when cutting such glue balls, burrs, and defects are unlikely to occur in the case of an optical filter having only one adhesive layer 2, but a plurality of functions are realized by a single optical filter. In particular, this was remarkable in the case of the optical filter 10 having a configuration in which the pressure-sensitive adhesive layer 2 has two or more layers independently of each other.

  In addition, as shown in FIG. 6, when the optical filters 10 after being cut into single sheets are stacked so as to be stored and transported, the paste balls P attached to the end portions thereof are already stacked. It will migrate and adhere to the surface of Usually, in order to protect the surface of the optical filter 10 from scratches and dirt, a protective film that can be peeled off is temporarily attached until use, so that the adhesive ball P adheres to the protective film surface. . Therefore, at the time of final use, the glue balls P adhering to the surface of the optical filter are removed together with the protective film, so that it seems that there is no problem as an optical filter. However, when the optical filters are stored and transported in a stacked state, a dent is generated in the optical filter itself at the portion of the paste balls P, resulting in a dent. Further, since the appearance inspection of the optical film is usually performed with the protective film attached, there is also a problem that the glue balls P interfere with the inspection in this respect.

  Further, as shown in FIG. 5, the burrs Q and the defects R were particularly prominent when the adhesive optical filter 10 had a minute louver layer 8 described later. In the fine louver layer 8, the portion exposed to the cut surface is pulled by the punching blade B that is soiled with an adhesive such as the glue ball P, but it is temporarily broken but becomes a broken piece that is deformed and protrudes. The problem of the occurrence of burrs Q, and the occurrence of defects R in the layer cross section at the portions where the burrs Q were dropped without stopping at the original position, was likely to cause rough sections.

  That is, an object of the present invention is to cut various paste balls, burrs, defects and the like when cutting an optical filter having adhesive layers separated from each other through a filter body into a predetermined shape and a predetermined size. The object is to provide a method for cutting an adhesive optical filter for display and a manufacturing method using the same, which can solve the problem.

Therefore, the present invention has the following configuration.
(1) A pressure-sensitive adhesive optical filter for display having a plurality of pressure-sensitive adhesive layers, each having a plurality of pressure-sensitive adhesive layers separated from each other via the filter main body, having a predetermined shape by a punching blade. When cutting into a predetermined size, the cutting edge of the adhesive optical filter for display is punched by using a punching blade whose tip angle θ is 30 ° or less and the surface of the blade is silicone-treated as the punching blade. Method.
(2) A method for producing a pressure-sensitive adhesive optical filter for a display comprising at least the following steps (a) and (b) in this order.
(A) A preparation step of preparing a pressure-sensitive adhesive optical filter for display, in which a plurality of pressure-sensitive adhesive filters each composed of a filter main body and a pressure-sensitive adhesive layer are stacked and the plurality of pressure-sensitive adhesive layers are separated from each other via the filter main body.
(B) The cutting process which cut | disconnects the adhesive optical filter for displays prepared by the said preparatory process to predetermined shape and predetermined size with the cutting method of the adhesive optical filter for displays of said (1).

  According to the present invention, the adhesive moves from the adhesive layer to the punching blade at the time of cutting, so that it is difficult to adhere to the punching blade. There is no problem. For this reason, a high-quality adhesive optical filter with an adhesive layer is obtained.

Sectional drawing which conceptually demonstrates the cutting method and manufacturing method of the adhesive optical filter for displays by this invention, and shows an example of the adhesive optical filter for displays. Sectional drawing of the blade-tip part which illustrates the various forms of a punching blade. Sectional drawing (a) which shows another example (with a micro louver layer) of an adhesion optical filter, and an expanded sectional view (b) of micro louver layer itself. It is a step view showing the shape of the evaluated punching blade, (a) is a conventional punching blade, and (b) and (c) are punching blades that are effective. Explanatory drawing explaining the glue ball, the burr | flash, and defect | deletion resulting from glue stain | pollution | contamination. Sectional drawing explaining the migration | diffusion diffusion of the glue ball which arises when an adhesive optical filter is stacked.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and the following drawings are conceptual diagrams, and the dimensional ratios of the respective portions are exaggerated as appropriate for convenience of illustration, instead of the actual dimensions.

"Overview"
First, with reference to FIG. 1, the outline | summary is demonstrated about the cutting method and manufacturing method of the adhesive optical filter for displays by this invention.

The pressure-sensitive adhesive optical filter for display targeted by the present invention includes a pressure-sensitive adhesive layer such as a pressure-sensitive adhesive optical filter 10 illustrated in FIG. 1 (hereinafter, the pressure-sensitive adhesive optical filter for display is also simply referred to as a pressure-sensitive adhesive optical filter). Like the layer 2a and the pressure-sensitive adhesive layer 2b, the layers are separated from each other via the filter main body 1a or 1b to be separated from each other and become independent layers. The adhesive optical filter 10 is an optical filter with an adhesive layer having two or more such adhesive layers. Moreover, in embodiment shown in the figure, an adhesive layer is also a structural example of the minimum number of 2 layers made into object by this invention. And the adhesive filter 3a which consists of the filter main body 1a and the adhesive layer 2a, and the adhesive filter 3b which consists of the filter main body 1b and the adhesive layer 2b are the adhesive layers (the adhesive layer 2a in the example of the figure). Are stacked.
Furthermore, although not indispensable, usually, in the same figure, a separator film 4 (the outline is indicated by a broken line) for temporarily protecting the adhesive surface is laminated on the surface of the adhesive layer 2b below the drawing so as to be peelable. Then, the protective film 5 (the contour line is indicated by a broken line) is detachably laminated on the surface of the filter main body 1a above the drawing.

In the method for cutting an adhesive optical filter for display according to the present invention, a punching blade B having a tip angle θ of 30 ° or less and a surface of the blade having a silicone treatment s is used.
Moreover, in the manufacturing method of the adhesive optical filter for a display by this invention, the above adhesive optical filters 10 are prepared, and it cut | disconnects with respect to this adhesive optical filter 10 with the above cutting methods.
By using such a cutting method or a manufacturing method using the same, various problems at the time of cutting such as paste stains such as glue balls, or rough sections such as burrs and defects when cutting into a predetermined shape and size by punching. Can be eliminated, and a high-quality adhesive optical filter for display can be obtained.

<Cutting method of adhesive optical filter for display>
The embodiment will be described from a cutting method of the adhesive optical filter for display.

[1. (Punching blade)
The punching blade B is a cutting tool called a Thomson blade or the like, in which one end in the width direction of the strip-shaped plate member is a tapered cutting edge and the other side is a fixing main body. In the present invention, as shown in FIG. 1, the tip angle θ of the cutting edge of the punching blade B is set to 20 to 40 °, and the surface of the cutting edge is further subjected to silicone treatment s. Even if one of the tip angle θ and the silicone treatment s is missing, it is not possible to eliminate all of the cross-sectional roughness such as glue stains such as glue balls, burrs, and defects.
As the tip angle θ of the cutting edge increases, the glue balls P, burrs Q, and defects R also increase. On the other hand, the smaller the tip angle θ, the smaller the degree to open the object to be cut (adhesive optical filter 10) (that is, the force with which the blade pushes the cut end surface of the filter body or the adhesive layer vertically) and the glue stains are reduced. Although there is a tendency, the mechanical strength of the punching blade B itself is weakened and the cutting edge is easily chipped, so there is a limit naturally. Therefore, more preferably, the tip angle θ is 25 to 30 °, and even if the upper limit is within this range, the tip angle θ should be as small as 29 °, 28 °, and 27 °.
The punching blade B has a plate thickness (the thickness of the main body) of about 0.5 to 1.0 mm. The thinner one is preferable in terms of glue stains and rough sections, but the mechanical strength is reduced accordingly. Therefore, for example, a plate having a thickness of 0.71 mm is used.
The punching blade B is usually fitted into a predetermined-shaped groove provided on a plywood or the like, and the shape of the blade tip in plan view is arranged and fixed along the contour line of the predetermined shape (single-wafer shape) to be cut out. The sheet 10 is cut.

Here, FIG. 2 is a cross-sectional view of the blade edge portion illustrating various shapes of the punching blade B, and even if the tip angle θ of the blade edge is within a predetermined range, the blade edge may have various shapes. In FIG. 2, the silicone treatment explicitly shown in FIGS. 1 and 3 is not explicitly shown.
First, FIG. 2 (a) is an example in which the cutting edge has a left-right asymmetric shape, and is an example of a (single stage) single-edged blade having a vertical surface on the right side and an inclined surface on the left side. Moreover, FIG.2 (b) is an example of the (1 step | paragraph) double blade of the inclined surface whose blade edge is a symmetrical shape. Moreover, FIG.2 (c) is an example of the double blade of the inclined surface of a multi-stage (2 steps | paragraph in the same figure) whose blade edge is a left-right symmetrical shape. On the other hand, the blades of FIGS. 2A and 2B are one-stage blades composed of only one type of surface having a constant inclination on both the left and right slopes.
Compared to a left-right asymmetric shape single blade as shown in FIG. 2A, a double-edged blade, which is also a left-right symmetrical shape as shown in FIG. 2B or FIG. Since the force received by the punching blade B is equally applied to the left and right, the cutting edge is difficult to bend, which is preferable in terms of durability of the punching blade B.

Note that the tip angle θ of the blade edge in the case of a two-stage blade as in the case of the punching blade B in FIG. 2C or FIG. The angle is not an angle γ (see FIG. 4C) .When the blade is a two-stage blade, the second-stage angle γ is smaller than the tip angle θ. The tip angle is smaller than θ, and is 30 ° or less at the maximum.
By making the cutting edge shape of the punching blade B subjected to the silicone treatment s into such a two-stage double-blade, the tip angle θ of the tip is the second-stage angle while reducing the angle of the cutting edge by the second-stage angle γ. Since it can be larger than γ, the mechanical strength of the tip can be increased, the cutting edge can be made difficult to chip, and the durability can be improved. Moreover, the burr | flash Q and the defect | deletion R can further be reduced compared with a single stage double blade.

(Silicone treatment)
Further, in the punching blade B, at least the portion of the cutting edge where the cutting object comes into contact is subjected to silicone treatment s. A punching blade in which the cutting edge is simply treated with fluorine is effective in eliminating cross-sectional roughness of burrs Q and defects R, but is insufficient for eliminating glue stains such as glue balls P. However, the punching blade B subjected to the silicone treatment s is effective in eliminating the roughness of the cross section of the burr Q and the defect R, and also effective in eliminating the glue dirt such as the glue balls P. Various problems can be solved. The reason for this is that when the punching blade B is punched and pulled out by the silicone treatment s, the occurrence of glue stains such as adhesion of adhesive balls P to the cutting edge of the punching blade B itself is eliminated, which has a positive effect on the occurrence of rough sections. It seems that you are doing.

As the silicone treatment s, the silicone is applied and then baked. Here, “baking” means to cure, and includes curing by non-heating by irradiation with ionizing radiation in addition to curing by heating. The treatment with curable silicone is preferable in that the non-adhesive film formed by the silicone treatment s effectively exhibits durability against peeling and abrasion. Examples of such silicone include silicone oil for peeling. Among silicone oils, modified silicone oil modified with one end, both ends, side chain, one end and side chain, both ends and side chain of silicone skeleton, has good adhesion to the punching blade body Is preferable. More preferably, a modified silicone oil modified with a reactive group such as an amino group, an epoxy group, an acryloyl group, a methacryloyl group or a hydroxyl group is preferred. Examples of such reactive modified silicone oil include amino-modified silicone oil, epoxy-modified silicone oil, and acrylate-modified silicone oil. A curing agent such as isocyanate or amine is appropriately added to these, and the coating film is cured by ionizing radiation such as heating, ultraviolet light, or electron beam to form a non-adhesive film on the blade edge surface.
In the skeleton structure of the silicone oil main body, two methyl groups are usually bonded to the silicon atom. One or more of these groups are substituted with an alkyl group having 2 or more carbon atoms, a phenyl group, or a fluorine-containing alkyl group. It may be replaced with a substituent such as a group.

The silicone treatment s is only required to be applied to at least the cutting edge portion with which the object to be cut comes into contact, and the main body portion excluding the cutting edge portion of the punching blade B is not necessary. However, the body portion may also be processed. In addition, the thickness of the non-adhesive film | membrane by silicone processing s should just be considered in consideration of durability, abrasion resistance, etc., for example, is 1-15 micrometers.
In addition, during the silicone treatment s, the surface to be treated may be subjected to a known easy adhesion treatment by various coupling agent treatments such as a silane coupling agent and a titanate coupling agent, or a roughening treatment. .

  In addition, points other than the tip angle θ and the silicone treatment s may be the same as those of a conventionally known punching blade. For example, the material of the punching blade B is metal, ceramics, or the like. Among them, iron and carbon steel are typical. For example, as carbon steel, medium carbon steel or high carbon steel can be used. To give a specific example, S50C medium carbon steel having a carbon content of 0.5% can be used.

[2. Adhesive optical filter for display)
The adhesive optical filter for display targeted by the present invention has two or more adhesive layers 2 that are separated and separated by being separated from each other via at least the filter body, like the adhesive optical filter 10 described in FIG. The optical filter is provided with a pressure-sensitive adhesive layer having a plurality of layers and having two or more layers of filter bodies. It can be said that it is the adhesive optical filter 10 which laminated | stacked two or more adhesive filters which have a filter main body and an adhesive layer. The adhesive optical filter having such a configuration, or the filter main body, the adhesive layer, etc. constituting the adhesive optical filter may be conventionally known ones. Therefore, here, each constituent layer will be described with reference to FIGS. 1 to 3.

[Adhesive filter]
The adhesive filter 3 is a filter having an adhesive layer, and includes a filter body 1 and an adhesive layer 2. FIG. 1 shows an example in which the adhesive filter 3a is composed of a filter body 1a and an adhesive layer 2a, and the adhesive filter 3b is composed of a filter body 1b and an adhesive layer 2b.

In general, the adhesive filter 3 is one laminated unit composed of a combination of one layer of the filter main body 1 and one layer of the adhesive layer 2 formed on one surface thereof. Two or more such laminated units are laminated to obtain the adhesive optical filter 10. In that case, in FIG. 1, the reference numerals of the adhesive filters 3 belonging to the same stack unit are attached with suffixes a or b to distinguish them. However, when it is not necessary to separately describe the adhesive filter 3 and the filter main body 1 and the adhesive layer 2 belonging to it for each adhesive filter 3 (for each lamination unit), the reference numerals are not suffixed. .
Further, a plurality of adhesive filters 3 stacked on each other will be referred to as an adhesive optical filter 10 so that they can be distinguished from these.

(Filter body)
As the filter main body 1, a near-infrared absorption filter, an electromagnetic wave shielding filter, an ultraviolet absorption filter, or a neon light absorption filter that absorbs neon light of a PDP that provides a visual effect, corrects a display image to a desired color tone. A color correction filter, an antireflection filter, a light control filter using a fine louver layer (for example, a contrast enhancement filter described in Japanese Patent Application Laid-Open No. 2007-272161, etc., which transmits display light emitted in the front direction and is obliquely above. One or more filters such as a filter that absorbs external light incident from the direction are included. These are all filters that control the transmission and propagation of light or electromagnetic waves. In addition, as the adhesive optical filter 10 for a display, a hard coat layer or the like that usually cannot be said to have a filter function is often added. Therefore, in this specification, functions other than the filter function such as a hard coat layer are provided. The “non-filter” to be assigned is also handled as being included in the filter body 1.

  Examples of the non-filter include a hard coat layer, an antistatic layer, a contamination preventing layer, an impact resistant layer, and a barrier layer for preventing mass transfer between the two layers. As these layers, known layers can be appropriately employed for display applications.

(Function realization layer)
In addition, the filter body has a function realizing layer that exclusively realizes various functions such as a filter function such as a near-infrared absorption function and a non-filter function such as an antistatic function, and a target for forming it or mechanically supporting it. And a transparent substrate sheet as a substrate to be made.
For example, in the adhesive optical filter 10 illustrated in FIG. 3A, the filter main body 1a is composed of an antireflection layer 6 as a function realizing layer and a transparent base sheet 7 in the adhesive filter 3a. The filter body 1b is composed of a fine louver layer 8 as a function realizing layer and a transparent base sheet 7. The adhesive filter 3a composed of the filter body 1a and the adhesive layer 2a and the adhesive filter 3b composed of the filter body 1b and the adhesive layer 2b are each laminated (to be) units, and the two laminated units are The pressure-sensitive adhesive layer 2a and the filter body 1b are laminated in such a direction that they are in contact with each other.

The various function realization layers are layers according to various functions to be imparted as the filter body 1. For example, in the case of a near-infrared absorbing layer, it is formed as a layer containing a near-infrared absorber in a transparent resin, and a hard coat layer If it is, it forms as a hardened | cured material layer of ionizing radiation curable resin. The function realization layer may realize one or more of the various functions in a single layer or a multilayer structure.
In addition, for example, the transparent substrate sheet 7 itself may be a function realizing layer, for example, an ultraviolet absorber is contained in the transparent substrate sheet 7.
Further, the pressure-sensitive adhesive layer 2 may also serve as a function realizing layer, for example, by containing an ultraviolet absorber in the pressure-sensitive adhesive layer 2.

(Micro louver layer)
Here, the fine louver layer 8 illustrated in FIG. 3 will be further described. In the present invention, in the cutting or manufacturing of the adhesive optical filter 10 having the micro louver layer 8, as shown in FIG. 5, the micro louver layer 8 that is likely to occur at the cut surface of the portion where the micro louver layer 8 exists is formed. This is because it is also effective in suppressing the occurrence of rough sections of the burrs Q and defects R.

The fine louver layer 8 itself is a known one, and as shown in the cross-sectional view of FIG. 3 (b), it is composed of a dark colored line 8a and a transparent resin layer 8b, and the dark colored line 8a is linear in plan view. The dark colored strips 8a are arranged in a large number at predetermined intervals in the direction parallel to the filter surface and in the direction parallel to the filter surface, and at least between the dark colored strips 8a. In addition, a transparent resin layer 8b is provided so as to support the dark color strip portion 8a. In addition, the transparent resin layer 8b of the same figure exists also in the part of the drawing upper side of the dark color stripe part 8a, and supports this dark color stripe part 8a also from the upper side of drawing.
The dark color strip portion 8a is formed from a dark color material in which a dark colorant such as carbon black is contained in the resin, and the transparent resin layer 8b is formed from a transparent resin. In addition, acrylate-based ionizing radiation curable resins that are cured with ultraviolet rays or electron beams are typically used as these resins and formed as a cured product layer thereof. And usually after forming the transparent resin layer 8b in which the groove-shaped concave portion opposite to the dark colored stripe portion 8a is formed on the transparent base sheet 7 first by a molding method such as shaping, The minute louver layer 8 is formed by filling only the inside of the groove-shaped recess with a dark resin material by a known wiping method or the like.
Note that the bottom of the dark colored strip 8a of the fine louver layer 8 (in FIG. 3B, the width of the portion exposed on the surface of the lower transparent resin layer 8b) is about 10 to 300 μm. Moreover, the space | interval (arrangement period) of the adjacent dark color stripe part 8a is about 10-1000 micrometers.

The fine louver layer 8 is usually thicker than the pressure-sensitive adhesive layer 2 or the like because the dark line 8a needs a distance in the thickness direction for the purpose of light control. For example, the thickness of the fine louver layer 8 is about 50 to 300 μm. Therefore, if it becomes a thick resin layer, flexibility will fall and it will become difficult to wind up in the roll form convenient for handling, such as storage and conveyance. For this purpose, the handleability is improved if a flexible resin is used for the transparent resin layer 8b which supports the dark colored strip portion 8a in the minute louver layer 8 and also serves as a light transmitting portion. However, if the transparent resin layer 8b has low elasticity and flexibility, cross-sectional roughness such as burrs Q and defects R is likely to occur. In particular, in the case of punching in the direction as shown in FIG. 3, that is, the transparent base material sheet 7 in contact with the fine louver layer 8 in contact with the transparent resin layer 8b and not in contact with the dark colored stripe 8a. If punched from the side, for some reason, rough sections such as burrs Q and defects R are likely to occur. On the other hand, the transparent base sheet 7 is made into the micro louver layer 8 by making the layer structure in which the vertical relationship between the micro louver layer 8 and the transparent base material sheet 7 is reversed and pushing the blade from the adhesive layer 2b side. In the case of punching so as to be cut later, for some reason, rough sections such as burrs Q and defects R are less likely to occur. However, by using the specific punching blade B, it is possible to solve the problem of rough cross-section such as burrs and defects.
As described above, the vertical relationship between the fine louver layer 8 and the transparent base sheet 7 is influenced by the fact that the soft micro louver layer 8 is positioned below the harder transparent base sheet 7 when it is cut, and the soft micro louver. When the soft pressure-sensitive adhesive layer 2 is located under the layer 8 and these are cut from behind the transparent base sheet 7, the deformation of the layer at the time of punching becomes larger, which is also considered to be affected. The

(Transparent substrate sheet)
Note that a transparent resin sheet (or film) is used as the transparent base sheet 7 in the case of being attached to the fine louver layer 8 and other function realizing layers. The resin of the resin sheet is, for example, a polyester resin such as polyethylene terephthalate, an acrylic resin, a polycarbonate resin, a polyolefin resin such as a cycloolefin polymer, or a cellulose resin such as triacetyl cellulose. Among these, a biaxially stretched polyethylene terephthalate film is a suitable material. In addition, although the thickness of the transparent base material sheet 2 is 12-500 micrometers normally from points, such as handleability and cost, Preferably it is 25-200 micrometers, There is no restriction | limiting in particular.
As described above, for example, the transparent substrate sheet 7 itself may be a function realizing layer, for example, an ultraviolet absorber is contained in the transparent substrate sheet 7 to form an ultraviolet absorption filter.
Moreover, the transparent base material sheet 7 may be shared by several function realization layers, such as providing a function realization layer on both surfaces of the transparent base material sheet 7, for example.

  “Sheet” may generally mean a thicker material than “film”. However, in the present invention, there is only a difference in name, and there is no particular distinction between the meanings. This is the same for the separator film and the protective film in addition to the transparent base sheet.

(Adhesive layer)
As the pressure-sensitive adhesive layer 2, a known layer can be appropriately employed. For example, it is formed of a transparent adhesive such as an acrylic adhesive, a silicone adhesive, a polyester adhesive, or a rubber adhesive.
The thickness of the pressure-sensitive adhesive layer 2 is usually about 15 to 50 μm, but if it is too thin, the adhesive strength (adhesive strength) will be weak, and if it is too thick, the cost will be high and glue stains will easily occur. Preferably it is about 20-30 micrometers.

In the above description with reference to FIGS. 1 and 3A, the adhesive layer 2a belongs to the adhesive filter 3a, and the adhesive layer 2b belongs to the adhesive filter 3b. This is an explanation based on the stacking order of the respective layers, in which the adhesive filter 3a and the adhesive filter 3b are each stacked units, and both stacked units are stacked by the adhesive layer 2a.
However, a laminating unit consisting of the adhesive filter 3b on the lower side of the drawing and a laminating unit consisting of the filter main body 1a on the upper side of the drawing are supplied with an independent pressure-sensitive adhesive layer 2a that does not belong to any of them. As a result, the pressure-sensitive adhesive layer 2a can also form a layer structure in which the pressure-sensitive adhesive filter 3a and the pressure-sensitive adhesive filter 3b are laminated. That is, the layer configuration of the adhesive optical filter 10 as an object includes the adhesive optical filter 10 obtained in such a stacking unit and stacking order in the manufacturing process. By manufacturing the adhesive optical filter 10 including such a stacking order, there is an advantage that the target adhesive optical filter 10 can be manufactured according to the raw material sheets having various configurations.

[Separator film]
In addition, as a separator film 4, a well-known thing can be used suitably. For example, a transparent film in which the surface of a resin film made of a polyester resin typified by polyethylene terephthalate or an olefin resin such as polyethylene or polypropylene is peel-treated by a silicone treatment or the like can be used. In addition, the thickness of a separator film is 10-250 micrometers normally, Preferably it is about 25-100 micrometers.

[Protective film]
Also, as the protective film 5, a known film can be used as appropriate. For example, a transparent pressure-sensitive adhesive film in which a weak pressure-sensitive pressure-sensitive adhesive layer is formed on the adhesive surface of a polyester film typified by polyethylene terephthalate or a resin film made of olefin resin such as polyethylene or polypropylene can be used. In addition, the thickness of a protective film is 10-250 micrometers normally, Preferably it is about 25-100 micrometers.

[3. (Cutting by punching)
The adhesive optical filter 10 for a display having the above-described configuration is cut into a predetermined shape and a predetermined size by the punching blade B described above. The predetermined size depends on the size of the display to be applied, and is a size that is slightly larger than the normal effective screen size. Further, the predetermined shape depends on the display shape to be applied, and is usually rectangular.
For punching, the punching blade B is pushed perpendicularly to the filter surface and cut, but the pushing direction may basically be from either the front or the back. However, when punching, as shown in FIGS. 1 and 3, not from the back side where the separator film 4 is laminated, but from the surface side where the opposite separator film 4 does not exist on the outermost surface Is more preferable. Thereby, when peeling the separator film 4, what is called tearing that a part of pressure-sensitive adhesive layer 2b immediately under it peels simultaneously can be suppressed. In addition, the said adhesive layer 2b is one layer located in the outermost layer among several adhesive layers which the adhesive optical filter 10 has, and the adhesive for sticking this adhesive optical filter 10 to a to-be-adhered body Is a layer. And it presupposes that the separator film 4 for temporarily protecting the adhesive surface is included as an essential element.

In this way, by cutting the adhesive optical filter 10 using the above-described punching blade B, it is possible to prevent the adhesive from adhering to the cutting edge of the punching blade B to be contaminated, and the glue caused by glue stains. Ball P can be eliminated. In addition, rough sections such as burrs Q and defects R on the cut surface can be eliminated.
As described above, the punching blade B is usually used as a punching die by fitting into a groove having a predetermined shape provided on a plywood or the like.

<< Method for Producing Adhesive Optical Filter for Display >>
The method for producing a pressure-sensitive adhesive optical filter for display according to the present invention is a method for producing the pressure-sensitive adhesive optical filter 10 by utilizing the above-described method for cutting a pressure-sensitive adhesive optical filter for display. The adhesive optical filter 10 to be cut may be a belt-like sheet or a single sheet.
Therefore, at least the following steps (a) and (b) are included in this order as the method for producing the adhesive optical filter for display.
(A) a preparatory step of preparing a pressure-sensitive adhesive optical filter for display, wherein a plurality of pressure-sensitive adhesive filters each composed of a filter main body and a pressure-sensitive adhesive layer are stacked and having a plurality of the pressure-sensitive adhesive layers separated from each other via the filter main body;
(B) A cutting step of cutting the display pressure-sensitive adhesive optical filter prepared in the above-described preparation step (a) into a predetermined shape and a predetermined size by the above-described method of cutting the pressure-sensitive adhesive optical filter for display, that is, the tip angle θ of the blade edge is 30 A cutting step of punching using a punching blade having a silicone treatment on the surface of the blade edge at a temperature of less than or equal to ° and cutting into an adhesive optical filter of a predetermined shape and a predetermined size,
The two steps.

In the preparation step (a), each layer of the filter main body 1 constituting the adhesive optical filter 10 is manufactured individually, and then each layer of each filter main body 1 is laminated with an adhesive layer 2 therebetween to be cut. It may be prepared by manufacturing the adhesive optical filter 10 to be prepared, or prepared by obtaining the adhesive optical filter 10 in which all the layers of the desired filter body 1 and the adhesive layer 2 are already laminated from the market. Also good. Alternatively, the adhesive optical filter 10 may be manufactured by individually obtaining each adhesive filter in which one adhesive layer 2 is formed on one layer of the filter body 1 from the market and laminating them. When each layer is formed and laminated, the above-described layers may be formed and laminated by a known method.
The adhesive optical filter 10 prepared in the step (a) may be in the form of a strip or a sheet as long as the sheet shape having a desired shape and size can be punched in the step (b). . However, a belt-like form capable of punching a plurality of desired punching shapes is preferable in that it can support continuous mass production at a high speed.

  In the cutting step (b), with the adhesive optical filter 10 prepared in the preparation step (a) as a cutting target, the cutting method of the adhesive optical filter for display described above, that is, the tip angle θ of the blade edge is 30 ° or less and the cutting edge The adhesive optical filter 10 is manufactured by cutting into a predetermined shape and a predetermined size by a cutting method in which the surface is punched using a punching blade having a silicone treatment.

  By using this method of manufacturing adhesive optical filters for displays, high-quality products that eliminate the occurrence of glue stains such as glue balls P during punching, and rough sections such as burrs Q and defects R, are eliminated. The adhesive optical filter 10 can be manufactured.

  Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

[Comparative Example 1]
First, in Comparative Example 1 using the punching blade before improvement, as the punching blade, the tip angle θ of the blade edge is 43 °, the length of the inclined portion of the blade edge is 0.9 mm, as shown in the sectional view of FIG. Uses a punching blade in which a normal carbon steel double blade with a plate thickness of 0.71 mm and a non-silicone surface is arranged along the outline of a punching shape having a rectangular shape in plan view of 360 mm and a width of 290 mm It was. Then, with this punching blade, the adhesive optical filter for display 10 shown in the sectional view of FIG. 3 was punched from the protective film 5 side and cut into a rectangular predetermined shape and a predetermined size corresponding to the display screen.
As a result, as shown in Table 1, glue balls were generated, and burrs and defects were generated in the cross section of the fine louver layer 8.

The configuration of the optical adhesive filter 10 is a filter having an antireflection layer 6 and a fine louver layer 8. Specifically, the protective film 5, the adhesive filter 3a, the adhesive filter 3b, and the separator film 4 are laminated in order from the front side that is the observer side, and the adhesive filter 3a includes the antireflection layer 6 and the transparent layer. The pressure-sensitive adhesive layer 2a is laminated on the filter body 1a made of the base sheet 7. The pressure-sensitive adhesive filter 3b has a structure in which the pressure-sensitive adhesive layer 2b is laminated on the filter body 1b made of the transparent base sheet 7 and the fine louver layer 8. It is.
The thickness of each layer is 50 μm for the protective film 5, 5 μm for the antireflection layer 6, 100 μm for the transparent base sheet 7, 25 μm for the adhesive layer 2 a and the adhesive layer 2 b, 80 μm for the microlouver layer 8, and 38 μm for the separator film 4. It is. In addition, a biaxially stretched polyethylene terephthalate film is used for the protective film 5, the transparent substrate sheet 7, and the separator film 4. The antireflection layer 4 is formed by coating with an antireflection paint made of a fluorine resin in which hollow silica particles are dispersed. An acrylic adhesive is used for the adhesive layer 2a and the adhesive layer 2b. Acrylic ultraviolet curable resin is used.

[Example 1]
As the punching blade B, the tip angle θ of the cutting edge shown in the cross-sectional view of FIG. 4B is 30 °, the length of the inclined portion of the cutting edge is 1.3 mm, the plate thickness is 0.71 mm, and the surfaces of the cutting edge and the main body are A punching blade B in which a silicon-treated double-edged blade made of carbon steel was arranged along a contour of a predetermined shape to be punched having a rectangular shape in plan view of 360 mm and a horizontal size of 290 mm was used. Others were the same as in Comparative Example 1, and the optical adhesive film 10 shown in FIG. 3 was punched from the protective film 5 side and cut into a predetermined size.
As a result, as shown in Table 1, no glue balls were generated, and both the burrs generated in the cross section of the fine louver layer 8 and the rough cross section of the defect were reduced and improved as compared with Comparative Example 1.

[Example 2]
As the punching blade B, as shown in the sectional view of FIG. 4 (c), the tip angle θ of the blade edge is 28 °, the length of the inclined portion where the tip angle θ of the blade edge is 0.2 mm, and the second stage of the second stage edge. The angle γ is 13 °, the total length of the inclined part of the first and second stage cutting edges is 2.8 mm, the plate thickness is 0.71 mm, and the first and second stage cutting edges and the surface of the main body are treated with silicone. A two-stage, two-blade punching blade B was used. Others were the same as in Comparative Example 1, and the optical adhesive film 10 shown in FIG. 3 was punched from the protective film 5 side and cut into a predetermined shape and a predetermined size.
As a result, as shown in Table 1, no glue balls were generated, and neither burrs generated in the cross-sectional portion of the fine louver layer 8 nor rough cross-sections of defects were generated.

[Comparative Example 2]
As the punching blade B, a double-blade punching blade having the same shape as Comparative Example 1 shown in the sectional view of FIG. Others were the same as in Comparative Example 1, and the optical adhesive film 10 shown in FIG. 3 was punched from the protective film 5 side and cut into a predetermined shape and a predetermined size.
As a result, as shown in Table 1, no glue balls were generated, but the cross-sectional roughness of burrs and defects generated in the cross-sectional portion of the fine louver layer 8 occurred in the same manner as in Comparative Example 1. The improvement effect of the silicone treatment was not recognized for the cross-sectional roughness of the defect.

<Application>
The adhesive optical filter with an adhesive layer targeted by the method for cutting an adhesive optical filter for a display according to the present invention and the production method using the same is used as a display, for example, a television receiver, a measuring instrument and instruments, PDP (plasma display), CRT (CRT), LCD (liquid crystal display), electroluminescent (EL) display, etc. used in office equipment, medical equipment, computer equipment, telephones, electronic signage, display equipment for game machines, etc. It is suitable for the front filter of various image display devices. In addition, it is also suitable as an optical film used for purposes such as infrared ray blocking and ultraviolet ray blocking stuck to windows and doors of buildings such as houses, offices, stores and hospitals.

DESCRIPTION OF SYMBOLS 1, 1a, 1b Filter main body 2, 2a, 2b Adhesive layer 3, 3a, 3b Adhesive filter 4 Separator film 5 Protective film 6 Antireflection layer 7 Transparent base material sheet 8 Microlouver layer 8a Dark color stripe part 8b Transparent resin layer 10 Display Adhesive Optical Filter B Punching Blade P Glue Ball Q Burr R Deficiency s Silicone Treatment θ Tip Angle γ (2nd Blade) Second Stage Angle

Claims (2)

  A plurality of pressure-sensitive adhesive filters each comprising a filter body and a pressure-sensitive adhesive layer are laminated, and a plurality of the pressure-sensitive adhesive layers are separated from each other via the filter body. A cutting method for a pressure-sensitive adhesive optical filter for display, wherein a punching blade having a tip angle θ of 30 ° or less and a surface of the cutting edge is subjected to silicone treatment is used as the punching blade. A method for producing a pressure-sensitive adhesive optical filter for display, comprising at least the following steps (a) and (b) in this order.
(A) A preparation step of preparing a pressure-sensitive adhesive optical filter for display, in which a plurality of pressure-sensitive adhesive filters each composed of a filter main body and a pressure-sensitive adhesive layer are stacked and the plurality of pressure-sensitive adhesive layers are separated from each other via the filter main body.
(B) The cutting process which cut | disconnects the adhesive optical filter for displays prepared by the said preparatory process to a predetermined shape and a predetermined size with the cutting method of the adhesive optical filter for displays of the said Claim 1.

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