KR20190073283A - Method for manufacturing sheet film - Google Patents

Abstract

The present invention relates to a method for manufacturing a single wafer film, having a cutting process for obtaining the single wafer film from a multilayer film having n adhesive layers (where n is an integer greater than or equal to 1). The cutting process includes a pressing and cutting process of cutting the multilayer film by allowing a pressing and cutting blade to enter the inside of the multilayer film from a first surface of the multilayer film toward a second surface of the multilayer film. The speed V (μm/s) of the pressing and cutting blade on the first surface of the multilayer film satisfies the following relational formula (1) one of the n adhesive layers is used as a reference adhesive layer. t/V<1/ω_1 (1) [In the relational formula (1), t represents the thickness (μm) of the multilayer film, and ω_1 represents the frequency (1/s) at which a storage elastic modulus is calculated based on a measured value of dynamic viscoelasticity measurement by the frequency sweep of the reference adhesive layer at a temperature of 20°C is 3.0×10^5 (Pa). Thus, stem-shaped minute protrusions and recesses can be suppressed from occurring.

Description

[0001] METHOD FOR MANUFACTURING SHEET FILM [0002]

The present invention relates to a method for producing a sheet-like film from a multilayer film having a pressure-sensitive adhesive layer and a method for manufacturing the multilayer film and a method for cutting the multilayer film.

As a conventional method of cutting a multilayer film including a polarizing plate or the like, there is known a method of cutting using a pressure blade (for example, JP-A-2015-33727 (Patent Document 1)). Patent Literature 1 discloses that as a pressure blade used for cutting a multilayered film, the occurrence of fluff on a cut surface can be suppressed by using a pressure blade whose surface roughness of the blade edge portion is within a specific numerical value range.

Patent Document 1: JP-A-2015-33727

As described in Patent Document 1, when the multilayered film is cut using a press-forming blade, there are cases where minute streaks of streaks are formed in the vicinity of the cut portion of the multilayered film surface. In the case of producing a sheet-like film by cutting a multilayer film for a mobile device such as a smart phone, since the size of the sheet-like film is small and the characters and images to be displayed are relatively small, the image is seen at a very short distance, It was easy to notice that it became apparent defects. The inventors of the present invention proceeded with the study, and it was found that the microstructure of the stem-shaped concavity and convexity is likely to occur when the multilayered film has the pressure-sensitive adhesive layer. The inventors of the present invention have found that a method capable of suppressing such minute stem-like irregularities has been accomplished.

An object of the present invention is to provide a method and an apparatus for producing a sheetfilm and a method for cutting a multi-layered film, which can inhibit the occurrence of stem-like minute irregularities.

The present invention provides a method and an apparatus for producing a sheetfilm as described below, and a method for cutting a multilayer film.

[1] A method for producing a sheetfilm having a multi-layered film having an n-layer (n is an integer of 1 or more) pressure-sensitive adhesive layer to obtain a sheetfilm from the multi-

The cutting step includes a pressing step of cutting the multilayer film by bringing a press blade (blade cutting edge) from the first surface of the multilayer film toward the second surface of the multilayer film to enter the multilayer film ,

(1) in the case where the velocity V (占 퐉 / sec) on the first surface of the multilayer film at the pressing edge is the reference pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-th layer, By weight based on the total weight of the sheet.

t / V < 1 /? ₁ (1)

(1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the thickness of the multilayered film measured on the basis of the measurement of the dynamic viscoelasticity measurement by the frequency sweep (sweep) at the temperature of the reference pressure- (1 / sec) at which the calculated storage modulus of elasticity is 3.0 x 10 &lt; ⁵ &gt; (Pa).

[2] The sheet-like pressure-sensitive adhesive sheet according to [1], wherein the pressure-sensitive adhesive layer has a minimum pressure-sensitive adhesive layer having a storage elastic modulus at a temperature of 20 ° C and an angular frequency of 1,000 radians / Gt;

[3] The multi-layer film has a separator film of the outermost layer and an adhesive layer below the outermost layer exposed on the outermost surface by peeling the separator film,

The method for producing a sheet-like film according to [1], wherein the pressure-sensitive adhesive layer under the outermost layer is used as the reference pressure-sensitive adhesive layer.

[4] The method for producing a sheet film according to any one of [1] to [3], wherein the multilayer film has a polarizer.

[5] An apparatus for producing a sheet-like film having a cut section for cutting a multi-layer film having an n-layer (n is an integer of 1 or more) pressure-sensitive adhesive layer to obtain a sheet-like film from the multi-

Wherein the cutting portion includes a pressure blade arranged so as to enter the multilayer film from a first surface of the multilayer film toward a second surface of the multilayer film and a control portion for controlling the motion of the pressure blade,

(M / sec) at the first surface of the multilayer film at the compression point, when the pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-layer is used as the reference pressure-sensitive adhesive layer, (1). &Lt; / RTI &gt;

t / V < 1 /? ₁ (1)

(1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the thickness of the multilayered film measured in terms of dynamic viscoelasticity measured by frequency sweep at 20 deg. (1 / sec) showing a modulus of elasticity of 3.0 x 10 &lt; ⁵ &gt; (Pa).

[6] An apparatus for producing a sheet-like film according to [5], wherein the pressure-sensitive adhesive layer has a minimum pressure-sensitive adhesive layer having a storage elastic modulus at a temperature of 20 ° C and an angular frequency of 1,000 radians / second as the reference pressure-sensitive adhesive layer.

[7] The multilayered film has a separator film of the outermost layer and an adhesive layer below the outermost layer exposed on the outermost surface by peeling the separator film,

And the pressure-sensitive adhesive layer under the outermost layer is used as the reference pressure-sensitive adhesive layer.

[8] An apparatus for producing a sheet-like film according to any one of [5] to [7], wherein the multilayer film has a polarizer.

[9] A cutting method for cutting a multi-layer film having an n-layer (n is an integer of 1 or more)

And a pressing step of cutting the multilayer film by entering the multilayer film by directing a press blade from a first surface of the multilayer film to a second surface of the multilayer film,

When the velocity V (占 퐉 / sec) on the first surface of the multilayer film at the press-breaking day is the reference pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-th layer, the following expression (1) A satisfactory multilayer film cutting method.

t / V < 1 /? ₁ (1)

(1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the thickness of the multilayered film measured in terms of dynamic viscoelasticity measured by frequency sweep at 20 deg. (1 / sec) showing a modulus of elasticity of 3.0 x 10 &lt; ⁵ &gt; (Pa).

[10] The method for cutting a multilayered film according to [9], wherein the pressure sensitive adhesive layer has a minimum storage elastic modulus at a temperature of 20 ° C and an angular frequency of 1,000 radians / second as the reference pressure sensitive adhesive layer.

[11] The multi-layer film has a separator film of the outermost layer and an adhesive layer below the outermost layer exposed on the outermost surface by peeling the separator film,

The method for cutting a multilayer film according to [9], wherein the pressure-sensitive adhesive layer under the outermost layer is used as the reference pressure-sensitive adhesive layer.

[12] The method for cutting a multilayer film according to any one of [9] to [11], wherein the multilayer film has a polarizer.

These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view schematically showing an example of a cutting process for obtaining a sheetfilm from a multilayer film. Fig.
2 is a schematic view schematically showing an example of a cutting process for obtaining a sheetfilm from a multilayer film.
3 is a schematic view schematically showing an example of a cutting process for obtaining a sheetfilm from a multilayer film.
Fig. 4 is a cross-sectional view schematically showing a cutting apparatus having a pressure blade.
5 is a cross-sectional view (a) showing an example of a pressure knife member, (b) is a perspective view from the underside, and FIG. 5 (c) is a bottom view.
6 is a diagram schematically showing a cutting operation by a pressure blade.
Fig. 7 is a bottom view showing an example different from Fig. 5 of the compression knife member.
Fig. 8 is an image diagram showing a minute streak-like unevenness occurring near the cut surface of the multilayer film surface.
9 is a schematic cross-sectional view schematically showing an example of a specific layer structure of the multilayer film.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In the following drawings, the scale of each component is appropriately adjusted in order to facilitate understanding, and the scale of each component shown in the figure does not always coincide with the scale of the actual component.

[Manufacturing method of sheet film]

The method of producing a sheetfilm according to the present embodiment has a cutting step of cutting a multilayered film having an adhesive layer of n layers (where n is an integer of 1 or more) to obtain a sheetfilm from the multilayered film. The cutting process includes a pressing process for cutting the multilayer film by advancing the pressure blade from the first surface of the multilayer film to the second surface of the multilayer film to enter the multilayer film.

When the pressure V (μm / sec) on the first surface of the multi-layer film of the pressure blade is the reference pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-th layer, ).

t / V < 1 /? ₁ (1)

In the above relational expression (1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the storage elastic modulus calculated on the basis of the measurement of dynamic viscoelasticity measurement by frequency sweep at 20 deg. (1 / sec) showing 3.0 x 10 &lt; ⁵ &gt; (Pa).

It is possible to suppress the occurrence of minute irregularities in the reference pressure-sensitive adhesive layer in the pressing step by satisfying the above-mentioned relational expression (1) in the velocity V (占 퐉 / sec) on the first surface of the multi- It is possible to suppress the occurrence of stem-like minute unevenness in the vicinity of the cut surface of the film surface. It is preferable that the reference pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer which tends to cause minute unevenness in the pressing step. Details of the method of selecting the reference pressure-sensitive adhesive layer will be described later.

The inventors of the present invention have found that there is a correlation between the viscoelastic characteristics of the pressure-sensitive adhesive layer in the pressing step and the ease of occurrence of minute unevenness in the pressure-sensitive adhesive layer. The fine irregularities generated in the pressure-sensitive adhesive layer cause fine unevenness on the surface of the multilayer film. The viscoelastic characteristic of the pressure-sensitive adhesive layer in the pressing process depends on the passing speed of the pressure blade passing through the pressure-sensitive adhesive layer. If the compaction time (t / V), which is related to the passing speed, is small enough to allow the pressure drop to pass through the first surface of the multilayer film to reach the second surface, the viscoelastic properties of the pressure- (1) is obtained on the assumption that minute unevenness is unlikely to occur in the pressure-sensitive adhesive layer and, as a result, minute unevenness is hardly generated even in the vicinity of the cut surface of the multilayer film surface, It is early. In addition, since the velocity V (占 퐉 / second) can be controlled so that the velocity in the multilayer film of the compression phase is almost the same, though it is the velocity at the first surface of the multilayer film of the compression phase, To reach the second surface can be regarded as substantially coinciding with the estimated time (t / V). Usually approximate time (t / V) is less than 9.0 × 10 ^-3 (s) but according to suppressing the occurrence of minute irregularities in the surface of the multilayer film, preferably not less than 2.5 × 10 ^-3 (s) Do. In addition, the typical estimated time (t / V) is 1.0 x ^10-4 (seconds) or more.

(Μm / sec) at the first surface of the multi-layer film of the compression-molding stage can be suppressed in any one of the above-mentioned pressure-sensitive adhesive layers of the n-th layer from the viewpoint of suppressing the minute unevenness generated in the pressure- (1) and satisfies the following relational expression (2) when the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer is a reference pressure-sensitive adhesive layer.

t / V < 1 /? ₂ (2)

In the above relational expression (2), t represents the thickness (占 퐉) of the multilayer film in the same manner as in the relational expression (1), and? ₂ represents the thickness of the multilayered film measured based on the measurement value of dynamic viscoelasticity measurement by frequency sweep at 20 占 폚 (1 / sec) showing a storage modulus of elasticity of 6.0 x 10 &lt; ⁵ &gt; (Pa).

<Cutting Process>

Figs. 1 to 3 are schematic views schematically showing an example of a cutting process for obtaining a sheetfilm from a multi-layer film by cutting a multi-layer film, respectively. In Figs. 1 to 3, a dotted line indicates a cutting line in the cutting step. In the example shown in Fig. 1, the long multilayer film 10a is cut in a direction orthogonal to the longitudinal direction by using a press-forming blade whose edge is linear, (Fig. 1 (a)), and the small-sized multilayer film 10b (Fig. 1 (b)). Thereafter, the small-sized multilayer film 10b is cut in the longitudinal direction of the original multilayer film 10a by using a press-forming blade whose edge is linear (Fig. 1 (b)) to obtain a sheet 11 of desired size (Fig. 1 (c)).

In the example shown in Fig. 2, the elongated multi-layer film 10a is cut by punching into a press-formed folding die (Fig. 2A) to obtain a sheet 11 of desired size (Fig. ).

In the example shown in Fig. 3, the elongated multilayer film 10a is cut in a direction orthogonal to the longitudinal direction by using a press-forming blade whose edge is linear, (Fig. 3 (a)), (Fig. 3 (b)). Thereafter, the sheet 11 is punched out by a press-forming die having the same shape as the mold to obtain a sheet 11 of desired size (Fig. 3 (c)).

The cutting direction of the cutting process shown in Figs. 1 to 3 is not particularly limited. In the case of cutting the multilayer film having the orientation characteristic, the cutting direction is determined so as to obtain the sheet film 11 having desired orientation characteristics do.

In each of the examples shown in Figs. 1 to 3, a single sheet or a plurality of sheets of sheets can be obtained from the multilayered film through one or more cuts. The number of times of cutting in the cutting step is not limited. In the above description, all of the cutting operations in the cutting step are the pressing process. However, the present invention is not limited to the one in which the cutting process is a pressing process. In addition to the pressing process, cutting by laser light, May be used. That is, the obtained sheetfilm may be a sheet including a cutting face by a pressing process. According to the pressing process, minute concave and convex streaks are likely to form in the vicinity of the cut portion of the surface of the multilayer film. In this embodiment, however, even if all of the cutting is a pressing process, such stem-

&Lt;

4 is a schematic view schematically showing a cutting apparatus having a pressure blade. The pressing step according to the present embodiment can be carried out by the cutting apparatus 20 shown in Fig. The cutting apparatus 20 is provided with a pressure kneading member 21 having a pressure kneading member, a control unit 24 for controlling the vertical movement of the pressure kneading member 21, and a multilayer film (23) for disposing the base (10). The multilayer film 10 is disposed on the placement table 23 so as to contact the transfer plate 22. In the multilayer film 10 disposed on the placement table 23, the surface contacting the backing plate 22 is referred to as the second surface 102, the upper surface facing the second surface 102 is referred to as the first surface 102, (101). In the pressing process, the press-in blade member 21 moves downward so that the press-in blade enters the multilayer film 10 from the first surface 101 to the second surface 102 of the multilayer film 10. Thereafter, the pressure blade is separated from the multilayer film 10 as the press-down blade member 21 moves upward. The multilayered film 10 is cut by this up and down movement of the pressure blade member 21.

5 (a) is a sectional view showing in detail the pressure kneading member 21a which is an example of the compression knife member 21 shown in Fig. 5 (b) is a perspective view from the lower surface of the compression knife member 21a, and Fig. 5 (a) is a cross-sectional view taken along the line a-a in Fig. 5 (b). 5 (c) shows a bottom view of the compression knife member 21a. The pressure day blade member 21a includes a pressure blade 211a having a straight blade edge portion, a holding portion 213a for holding the pressure blade 211a, and an elastic body 212a disposed on the lower surface of the holding portion 213a Respectively. The lowest surface of the elastic body 212a is located at the same position as the blade edge of the press blade 211a or below the blade edge of the press blade 211a.

6 (a) to 6 (c) are views showing a case where the multilayered film 10 is cut by a cutting apparatus having the piezoelectric element 21a shown in Figs. 5 (a) to 5 Is a diagram schematically showing the cutting operation by the press blade 211a. The cutting operation is carried out in such a manner that the pressure lowering member 21a moves downward (Fig. 6 (a)) so that the lowermost surface of the elastic body 212a of the pressure kneading member 21a contacts the first surface 101 of the multilayer film 10, (Fig. 6 (b)). The elastic body 212a contracts on the first surface 101 of the multilayer film 10 and only the cutting edge 211a contracts on the first surface 101 of the multilayer film 10, 1 enters the multilayer film 10 from the surface 101 and continues to enter until it reaches the pay-off plate 22 (Fig. 6 (c)). When the cutting edge 211a reaches the pay-off plate 22, the direction of movement of the pressure kneading member 21 is switched to the upward direction, and the cutting edge 211a is pulled out of the multilayer film 10. The multilayer film 10 is cut in the stacking direction by the above cutting operation.

The pressure blade 211a provided in the cutting blade member 21a is limited to the pressure blade on which the multilayer film 10 as shown in Figs. 5 (a) to 5 (c) can be linearly cut And can be designed so that the desired cutting can be performed. Or may be a press-shaped blade having the same shape as a mold capable of punching a rectangular sheet film from the multilayer film 10. Fig. 7 is a bottom plan view of an example of a pressure knife member having a press-formed blade of the same shape as a mold. 7 is provided with a pressure blade 211b, a holding member, and an elastic body 212b. The pressure blade 211b shown in Fig. 7 is different from the pressure blade 211b shown in Fig. 5 21a, and the multilayer film 10 can be cut by the same method.

Thomson blades are preferably used as the pressure blades 21a and 21b. The Thompson blade may be a surface treated with resin. The elastic members 212a and 212b are not limited as long as they can shrink on the surface of the multilayer body and can fix the multilayer body by interposing the multilayer body 10 together with the bladder plate 22 at the time of cutting, And a soft material such as urethane rubber are preferably used.

In the cutting apparatus according to the present embodiment, the control section 24 controls the pressing force of the pressing blade member 21 so that the velocity V (占 퐉 / sec) on the first surface of the multilayer film at the press- As shown in FIG.

<Other Processes>

The method for manufacturing a sheetfilm according to the present embodiment may include steps other than the above-described cutting step, for example, a multilayer film manufacturing process for manufacturing a multilayer film, a winding process for unwinding the multilayer film wound in roll form, A conveying step of conveying a film or a sheet of film, a drying step of drying a multilayer film or a sheet film, and the like.

<Multilayer Film>

The multilayer film is not particularly limited as long as it has a pressure-sensitive adhesive layer. The multilayer film is, for example, an optical laminated film. In the case of an optical laminated film, even minute irregularities are likely to cause problems in appearance. The thickness of the multilayered film is, for example, 5 to 3000 占 퐉, preferably 20 to 500 占 퐉. It is preferable that the layer structure of the multilayered film has a layer structure in which the pressure-sensitive adhesive layer is not exposed to the outermost surface so that the dirt may not adhere to the pressure-sensitive adhesive layer in the cutting step.

When the multilayered film has a pressure-sensitive adhesive layer, if it is cut using a pressure blade, small irregularities in the form of stalks tend to be formed in the vicinity of the cut surface of the multilayered film surface. According to the manufacturing method of the sheetfilm in this embodiment, Can be suppressed. More specifically, the minute unevenness is often a stem-like convex line extending in a direction substantially parallel to the cut surface, and often occurs on the second surface in contact with the toll plate. As a mechanism that can form minute concavities and convexities, it is not clear, but one mechanism that can be considered is that a shear stress is generated in each layer due to the entry of the pressure blade and a difference in shear stress acting on the two layers in contact with the pressure- And the pressure-sensitive adhesive layer is locally deformed. This local deformation is presumably due to the softness of the pressure-sensitive adhesive layer as compared with other layers.

Fig. 8 is an image diagram showing micro-irregularities formed in the vicinity of the cut surface of the multilayer film surface. The mechanism for generating minute unevenness described with reference to Fig. 8 is one conceivable mechanism, and the minute unevenness suppressed by the manufacturing method of the sheetfilm of the present embodiment is limited to the unevenness caused by such a mechanism And is not limited to the minute irregularities schematically shown in Fig. 8, a multilayer film composed of the layer 101, the pressure-sensitive adhesive layer 102, and the layer 103 is assumed as the multilayer film 10 to be cut. When the press blade 211 enters the multilayer film 10, different shear stresses are generated in the respective layers and the pressure-sensitive adhesive layer 102 is softer than the layers 101 and 103 adjacent thereto, The locality near the cut surface of the pressure-sensitive adhesive layer 102 slightly rises due to the difference in the shear stress acting on the pressure-sensitive adhesive layers 101 and 103, thereby forming the convex line 102a. The layer 103 adjacent to the pressure-sensitive adhesive layer 102 may also rise slightly due to the convex line 102a of the pressure-sensitive adhesive layer 102 to form the convex line 103a. As described above, the convex line 102a formed in the pressure-sensitive adhesive layer 102 and the convex line 103a formed in the layer 103 are the cause of the stem-like concavity and convexity which is visually recognized.

(Pressure-sensitive adhesive layer)

The pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing as a main component a resin such as (meth) acrylic, rubber, urethane, ester, silicone or polyvinyl ether. Among them, a pressure-sensitive adhesive composition comprising a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is suitable. The pressure-sensitive adhesive composition may be an active energy radiation curable type or a thermosetting type.

Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include (meth) acrylic acid esters such as (meth) acrylic acid butyl (meth) acrylate, isobutyl (meth) acrylate, A polymer or a copolymer containing one or more of esters as a monomer is suitably used. The base polymer is preferably copolymerized with a polar monomer. Examples of polar monomers include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (Meth) acrylate, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like.

The pressure-sensitive adhesive composition may contain only the base polymer, but usually contains a crosslinking agent. Examples of the cross-linking agent include a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group; A polyamine compound, which forms an amide bond with a carboxyl group; A polyepoxy compound or a polyol, which forms an ester bond with a carboxyl group; Is a polyisocyanate compound, and forms an amide bond with a carboxyl group. Among them, a polyisocyanate compound is preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of curing upon irradiation with an active energy ray such as ultraviolet rays or electron rays and has adhesiveness even before irradiation with active energy rays and can be adhered to an adherend such as a film, And is capable of adjusting the adhesive force. The active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet curable type. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. In some cases, a photopolymerization initiator, a photosensitizer or the like may be contained as needed.

The pressure-sensitive adhesive composition is preferably a pressure-sensitive adhesive composition comprising fine particles, beads (resin beads, glass beads, etc.) for imparting light scattering properties, glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders and other inorganic powders, Absorbents, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators, and the like.

Applying an organic solvent diluent of the pressure-sensitive adhesive composition on a substrate, and drying it. When an active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be obtained by irradiating an active energy ray to the pressure-sensitive adhesive layer formed.

The thickness of the pressure-sensitive adhesive layer may be, for example, 1 to 40 m. When the thickness of the pressure-sensitive adhesive layer is 1 to 40 占 퐉, small streak-like projections and depressions are easily generated by the pressing step. However, according to the method for producing a sheet film of the present embodiment, even if the thickness of the pressure-sensitive adhesive layer is 1 to 40 占 퐉, Can be suppressed.

The pressure-sensitive adhesive layer may exhibit a storage elastic modulus of 0.15 to 1 MPa at a temperature of 20 DEG C and an angular frequency of 1,000 radians / sec. When the pressure-sensitive adhesive layer has such a storage elastic modulus, the pressure-sensitive adhesive layer tends to be slightly soft as compared with other layers, resulting in minute unevenness. According to the production method of the sheetfilm of the present embodiment, It is possible to suppress the generation of minute irregularities even at 1 MPa.

The storage elastic modulus of the pressure-sensitive adhesive layer can be measured using a commercially available viscoelasticity measuring apparatus, for example, a viscoelasticity measuring apparatus "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC.

As a method for adjusting the storage elastic modulus to the above range, an oligomer, specifically, an urethane (meth) acrylate oligomer is further added to a pressure-sensitive adhesive composition comprising a base polymer or a crosslinking agent to form an active energy ray- (Preferably an ultraviolet curable pressure-sensitive adhesive composition). More preferably, the active energy ray is irradiated to properly cure the pressure-sensitive adhesive layer.

(Reference pressure-sensitive adhesive layer)

The multilayered film used or manufactured in the method of manufacturing a sheetfilm of the present embodiment has an n-layer (n is an integer of 1 or more) adhesive layer. When the pressure-sensitive adhesive layer included in the multilayered film is one layer, the velocity of the pressure blade is controlled to satisfy the above-mentioned relational expression (1) by using the pressure-sensitive adhesive layer as a reference pressure-sensitive adhesive layer. When the pressure-sensitive adhesive layer included in the multilayer film is a plurality of pressure-sensitive adhesive layers, it is preferable that the pressure-sensitive adhesive layer having the knowledge that it is easy to cause irregularities in the pressing step. The present inventors have found that the pressure-sensitive adhesive layer exemplified in the following i) and ii) is easy to cause unevenness in the pressing step, and is exemplified as the reference pressure-sensitive adhesive layer.

i) a pressure-sensitive adhesive layer having a minimum storage elastic modulus at a temperature of 20 DEG C,

ii) a pressure-sensitive adhesive layer below the outermost layer, wherein the multilayered film has a separable film of the outermost layer and a pressure-sensitive adhesive layer below the outermost layer exposed on the outermost surface by peeling of the separate film.

Further, in the method of producing a sheetfilm of the present embodiment, it is preferable that the velocity of the pressing blade satisfies the relational expression (1) even when any of the n-layer pressure-sensitive adhesive layers is used as the reference pressure-sensitive adhesive layer.

(Example of Layer Configuration of Multilayer Film)

9 is a schematic cross-sectional view schematically showing an example of a specific layer structure of a multilayer film used or manufactured in the method for manufacturing a sheet film according to the present embodiment. The multilayer film 10d includes a polarizing plate 100 including a polarizer (not shown in Fig. 9), a protective film 60 laminated on one surface of the polarizing plate 100, and a first pressure- Sensitive adhesive layer 31 and a peelable separate film 70 for temporarily protecting the first pressure-sensitive adhesive layer 31 on the outer surface of the first pressure-sensitive adhesive layer 31 are laminated. On the other hand, the surface of the polarizing plate 100 on the side of the protective film 60 (the surface to which the protective film 60 is bonded) and the surface of the first pressure sensitive adhesive layer 31 (the first pressure sensitive adhesive layer 31 is bonded Surface) can be, for example, the surface of a protective film, another optical film or a layer added onto the film.

The protective film 60 may be laminated on one side of the polarizing plate 100 with one side being tacky and the other side being non-tacky and tacky. As such a protective film 60, there can be mentioned a so-called self-adhesive protective film. The self-adhesive property protecting film is, for example, a resin film comprising a non-sticking resin layer 61 made of a non-sticking resin and a sticking resin layer 62 made of a self-sticking resin. Examples of the self-adhesive protective film include "Dore Tech" (Toray Film Kako Co., Ltd.) and the like. Further, a protective film composed of a resin film (base film) 61 and a second pressure-sensitive adhesive layer 62 laminated thereon and laminated to the polarizing plate 100 through the pressure-sensitive adhesive layer is also exemplified. When the protective film 60 has the second pressure sensitive adhesive layer 62, the storage elastic modulus is generally higher than the storage elastic modulus of the first pressure sensitive adhesive layer.

The polarizing plate 100 is a polarizing element including at least a polarizer and a first pressure-sensitive adhesive layer 31, and typically further includes a protective film bonded to one surface or both surfaces of the polarizer. The polarizing plate 100 may include, in addition to the protective film, another optical film such as a film having an optical function different from that of the polarizer, or a layer added on a film such as an optical layer. Various optical films including a protective film can be bonded together through an adhesive layer or a pressure-sensitive adhesive layer. The polarizing plate 100 may or may not include a pressure-sensitive adhesive layer. When the pressure-sensitive adhesive layer is included, the pressure-sensitive adhesive layer included in the polarizing plate 100 becomes one of the pressure-sensitive adhesive layers of the n-layer included in the multilayer film.

The thickness of the polarizing plate 100 is usually 20 to 200 占 퐉, preferably 30 to 150 占 퐉, more preferably 40 to 120 占 퐉, and still more preferably 50 to 100 占 퐉.

The multilayered film 10d is obtained by laminating a raw film continuously fed out from the film roll and another raw film continuously loosened from the film roll in the same manner, and winding the obtained long laminated film in roll form , A so-called roll-to-roll method, or a multilayer film obtained by further cutting it. In the method for producing sheetfilm according to the present embodiment, the multi-layer film 10d is cut in the cutting step to produce a sheetfilm.

When the first pressure sensitive adhesive layer 31 and the second pressure sensitive adhesive layer 62 are included together as the pressure sensitive adhesive layer, the multilayered film 10d has the first pressure sensitive adhesive layer 31 side where the separable separable film 70 is laminated This tends to cause minute irregularities in the normal pressing process. This is considered to be due to the fact that the separator film 70 is once peeled or displaced by the action of the shearing stress and the displacement of the adhesive layer is fixed.

When the multilayered film 10d is cut by the cutting apparatus shown in Fig. 4, the side of the protective film 60 is set as the first surface, the side of the separate film 70 is set as the second surface, The side of the separate film 70 may be used as the first surface and the side of the protective film 60 may be used as the second surface. The resin film 61 constituting the film 60 may be placed on the placing table 23 so as to be in contact with the transfer plate 22 and cut. According to the method for producing a sheet film of the present embodiment, it is possible to suppress the occurrence of small stem-shaped concavo-convexes in the pressing step even when the multilayered film 10d is arranged in any direction.

The shape of the uncracked multilayer film 10d is not particularly limited, but is typically a straight line (strip shape). Although the length in the longitudinal direction and the length in the width direction of the uncracked multilayer film 10d are not particularly limited, the length in the longitudinal direction of the multilayer film 10d is generally 100 m to 20,000 m, 1,500 mm. Further, the multilayer film 10d may be cut into a small-sized multilayer film 10d and then provided to the pressing step. In this case, although the shape of the multi-layer film 10d of the piece is not particularly limited, it is preferable that it has a rectangular shape with long sides and short sides, and is typically rectangular. The length of the long side and the length of the short side are not particularly limited, but the length of the long side is 900 mm or less and the length of the short side is 800 mm or less.

The size, shape and cutting angle of the sheet film are not particularly limited. The sheet film is preferably a rectangular shape, more preferably a rectangular shape having long sides and short sides. This rectangular shape is preferably rectangular. In the case where the sheetfilm is rectangular, the length of the long side is, for example, 50 mm to 300 mm, preferably 70 mm to 200 mm. The length of the short side is, for example, 30 mm to 200 mm, preferably 40 mm to 100 mm. The minute concavity and convexity generated on the surface of the sheet-like film near the cut surface in the pressing process tends to become conspicuous as the size of the sheet-like sheet becomes smaller, and thus it becomes defective in appearance. According to the sheet- It is possible to prevent minute concavities and convexities from being generated.

(1) Polarizer

The polarizer is an absorption type polarizer that absorbs linearly polarized light having a vibration plane parallel to its absorption axis and transmits linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis), and is a polyvinyl alcohol A polarizing film in which a dichroic dye is adsorbed and aligned on a base resin film can be suitably used. The polarizer may be, for example, a step of uniaxially stretching a polyvinyl alcohol-based resin film; A step of adsorbing a dichroic dye by staining a polyvinyl alcohol-based resin film with a dichroic dye; Treating a polyvinyl alcohol-based resin film adsorbed with a dichroic dye with an aqueous solution of boric acid; And a step of washing with water after treatment with an aqueous boric acid solution.

The thickness of the polarizer is preferably 50 占 퐉 or less, more preferably 30 占 퐉 or less. Setting the thickness of the polarizer to be 30 占 퐉 or less is advantageous for reducing the thickness of the polarizing plate 100, and further, the image display apparatus. The thickness of the polarizer is usually 2 占 퐉 or more (e.g., 5 占 퐉 or more).

(2) Protective film

The protective film which can be laminated on one surface or both surfaces of the polarizer is preferably a thermoplastic resin having light transmittance (preferably optically transparent) such as a chain polyolefin resin (polypropylene resin or the like), a cyclic polyolefin resin (norbornene resin Etc.); Cellulose-based resins such as triacetylcellulose and diacetylcellulose; Polyester-based resins such as polyethylene terephthalate and polybutylene terephthalate; Polycarbonate resin; (Meth) acrylic resins such as methyl methacrylate resins; Polystyrene type resin; Polyvinyl chloride resins; Acrylonitrile-butadiene-styrene-based resin; Acrylonitrile-styrene series resin; Polyvinyl acetate resin; Polyvinylidene chloride resins; Polyamide based resin; A polyacetal-based resin; Modified polyphenylene ether-based resin; Polysulfone resins; Polyether sulfone type resin; Polyarylate resins; Polyamideimide series resin; A polyimide-based resin, or the like. Among them, it is preferable to use a polyolefin resin or a cellulose resin. In the present specification, the term "(meth) acrylic resin" refers to at least one kind selected from the group consisting of an acrylic resin and a methacrylic resin. The same applies to the term to which other "(meth)" is added.

The thickness of the protective film is usually 1 to 100 占 퐉, but it is preferably 5 to 60 占 퐉, more preferably 5 to 50 占 퐉, from the viewpoints of strength and handleability.

At least one of the protective films has a hard coat layer, an antiglare layer, a light diffusion layer, a retardation layer (retardation layer having a retardation value of 1/4 wavelength, etc.), an antireflection layer, (Coating layer) such as an antistatic layer, an antifouling layer, or an optical layer.

The protective film can be bonded to the polarizer through, for example, an adhesive layer. As the adhesive forming the adhesive layer, an aqueous adhesive, an active energy ray-curable adhesive, or a thermosetting adhesive can be used, and preferably an aqueous adhesive and an active energy ray-curable adhesive.

(3) Other optical films

The polarizing plate 100 may include an optical film other than the polarizer and the protective film, and typical examples thereof include a brightness enhancement film and a retardation film. When the polarizing plate 100 includes another optical film, the protective film 60 may be laminated on the surface of the optical film.

(4) First pressure-sensitive adhesive layer

The first pressure sensitive adhesive layer 31 is a pressure sensitive adhesive layer disposed on the outermost surface of the polarizing plate 100 and can be used for bonding the multilayered film to an image display element (e.g., a liquid crystal cell) or another optical member. The thickness of the first pressure-sensitive adhesive layer 31 may be 1 to 40 占 퐉, but from the viewpoint of thinning of the polarizing plate 100 and suppressing the dimensional change of the polarizing plate 100 while maintaining good processability, For example, 3 to 20 mu m, further preferably 3 to 15 mu m). As for the material of the first pressure sensitive adhesive layer 31, the description of the above-mentioned pressure sensitive adhesive layer is applied as it is.

(5) Separate film

The separate film 70 is a film temporarily adhered to protect the surface of the first pressure-sensitive adhesive layer 31 until the first pressure-sensitive adhesive layer 31 is bonded to an image display element (e.g., liquid crystal cell) or another optical member. The separate film 70 is usually made of a thermoplastic resin film subjected to a releasing treatment on one side, and the releasably treated side is bonded to the first pressure sensitive adhesive layer 31. The thermoplastic resin constituting the separate film 70 may be, for example, a polyethylene-based resin such as polyethylene, a polypropylene-based resin such as polypropylene, or a polyester-based resin such as polyethylene terephthalate or polyethylene naphthalate. The surface of the third pressure sensitive adhesive layer 32 may be adhered to the surface of the third pressure sensitive adhesive layer 32 until the optical film such as the brightness enhancement film 50 is adhered. The thickness of the separate film 70 is, for example, 10 to 100 mu m. If the thickness of the separate film directly contacting the first pressure-sensitive adhesive layer 31 is 50 m or less when the storage elastic modulus of the first pressure-sensitive adhesive layer 31 is 0.15 to 1 MPa, Since the number of minute irregularities in the layer 31 is increased, the method of the present invention is preferably applied.

(6) Protective film

The protection film 60 is composed of a resin film 61 and a non-adhesive resin layer 62 or a second pressure-sensitive adhesive layer 62 laminated thereon. The protective film 60 is a film for protecting the surface of the polarizing plate 100 and is usually formed by bonding a polarizing plate having a protective film to an image display element or another optical member after bonding the adhesive resin layer 62 or the second And the pressure-sensitive adhesive layer 62 is peeled off.

As the resin constituting the resin film 61, a resin such as a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate and polyethylene naphthalate, a thermoplastic resin such as a polycarbonate resin Lt; / RTI &gt; And is preferably a polyester resin such as polyethylene terephthalate. The resin film 61 may have a single-layer structure or a multi-layer structure, but is preferably a single-layer structure in view of ease of manufacture and manufacturing cost. With respect to the second pressure-sensitive adhesive layer 62, the technique relating to the first pressure-sensitive adhesive layer 31 described above is cited.

[Manufacturing apparatus for sheetfilm]

The sheet manufacturing apparatus according to the present embodiment has a cut section for cutting a multilayer film having a pressure-sensitive adhesive layer to obtain a sheet from a multilayer film. The cut-off portion has a pressure knife disposed so as to enter the multilayer film from the first surface of the multilayer film toward the second surface of the multilayer film. As for the cut portion, the description of the above-mentioned cutter in the method of manufacturing the sheet is applied as it is. As for the multilayer film, the description of the above-mentioned multilayer film in the method of producing a sheet film is directly applied.

The sheet manufacturing apparatus according to the present embodiment may have constituent elements other than the above-described cut portions. For example, the sheet producing apparatus according to the present embodiment may include a multilayer film producing section for producing a multilayer film, a winding section for unwinding the multilayer film wound in roll form, A conveying section for conveying a film or a sheet of film, a drying section for drying a multilayer film or a sheet film, and the like.

[Cutting method of multilayer film]

The method for cutting a multilayered film according to the present embodiment includes a pressing step of cutting the multilayered film by advancing the multilayered film in such a manner that the pressing edge is directed from the first surface of the multilayered film to the second surface of the multilayered film. As for the cutting method, the description of the above-described cutting step in the manufacturing method of the sheetfilm is applied as it is.

Example

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[Multilayer Film A]

As a multilayer film A to be cut, a cycloolefin polymer (COP) polarizing plate (SRD341 mass production fabric) having a rectangular protective film having a thickness of 185 μm and a length of 300 mm long side and a length of 210 mm short side was used. A COP polarizing plate with a protective film was prepared by forming a protective film (58 占 퐉), a TAC film (25 占 퐉) as a protective film, a PVA film (12 占 퐉) as a polarizer, a COP film (23 占 퐉) ) And a PET film (38 占 퐉) as a separate film are stacked. One side of the protective film was tacky and the other side was non-tacky, and one side of tackiness was in contact with the TAC film.

The first pressure sensitive adhesive layer had a storage elastic modulus of 0.34 MPa at a temperature of 20 DEG C and 1,000 radians / second at each frequency. Regarding the multilayer film A, the first pressure-sensitive adhesive layer is the reference pressure-sensitive adhesive layer. Dynamic viscoelastic properties of the reference pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) were measured by frequency scraping at a temperature of 20 ° C using a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC Co., The frequency ω ₁ showing 3.0 × 10 ⁵ (Pa) was derived and found to be 1.20 × 10 ² (1 / sec). Similarly, based on the measured value, frequency ω ₂ showing a storage elastic modulus of 6.0 × 10 ⁵ (Pa) was derived and found to be 6.03 × 10 ² (1 / sec).

[Multilayer Film B]

The multilayer film B is a pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer, wherein a pressure-sensitive adhesive composition different from the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer of the multilayer film A is used and the thickness of the first pressure- Except that the thickness of B was 180 占 퐉. The first pressure sensitive adhesive layer had a storage elastic modulus of 0.65 MPa at a temperature of 20 DEG C and an angular frequency of 1,000 radians / second. For the multilayer film B, the first pressure-sensitive adhesive layer was used as the reference pressure-sensitive adhesive layer. The dynamic viscoelasticity of the reference pressure-sensitive adhesive layer was measured by frequency scraping at a temperature of 20 ° C using a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC Co., and the storage elastic modulus was 3.0 × 10 ⁵ bar derived the visible frequency ω ₁ of Pa), was 1.62 × 10 (1 / sec). Similarly, based on the measured value, the frequency ω ₂ showing a storage elastic modulus of 6.0 × 10 ⁵ (Pa) was 1.38 × 10 ² (1 / sec).

[Example 1]

(Cutting test)

A cutting test was carried out using the cutting apparatus shown in Fig. 4 provided with the cutting blade member 21a shown in Fig. As the cutting edge 211a of the cutting blade member 21a, a Thompson blade (manufactured by Oginose Ikisei Sakishima Co., Ltd.) having a length of 614 mm was used.

First, the multilayer film A was placed on the stage 23 so as to contact the back plate 22. At this time, the PET film (58 mu m) constituting the protective film was placed on the upper side and the PET film (38 mu m) serving as the separate film was placed on the lower side. Then, the cutting blade 211a was introduced into the multilayer film A so that the velocity at the surface of the protective film was 7.6 × 10 ⁴ (μm / sec) and cut in a direction orthogonal to the absorption axis to obtain a COP polarizing plate 2 times.

(Evaluation of occurrence of stem-shaped unevenness)

A cutting test was performed on five samples, and the presence or absence of stem-shaped irregularities in the vicinity of the cut surface of the surface of the cut piece divided into two for five samples was visually evaluated. The evaluation results are shown in Table 1.

[Example 2]

In the cutting test, a cutting test was conducted in the same manner as in Example 1 except that the cutting edge 211a was entered into the multilayer film A so that the speed at the surface of the protective film was 1.2 × 10 ⁵ μm / The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

[Example 3]

Except that the multilayer film B was used in place of the multilayer film A and the cutting edge 211a was set in the multilayer film B so that the speed at the surface of the multilayer film B was 2.1 × 10 ⁴ μm / A cutting test was carried out in the same manner as in Example 1 to evaluate whether or not stem-like unevenness occurred. The evaluation results are shown in Table 1.

[Example 4]

In the cutting test, performing a cutting edge (211a) for cutting test in the same manner on the multi-layer film B, except that the protective film surface speed that was entered to 7.6 × 10 ⁴ ㎛ / sec in the embodiment 3, the stem-shaped The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

[Comparative Example 1]

A cutting test was carried out in the same manner as in Example 1 except that the cutting edge 211a was entered into the multilayer film A so that the speed at the surface of the protective film was 6.6 x 10 ³ 탆 / The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

[Comparative Example 2]

In the cutting test, performing a cutting edge (211a) for cutting test in the same manner as in Example 1, the multilayer film A, the speed of the protective film surface other than that in which the entry to be 2.1 × 10 ⁴ ㎛ / sec, stem shape The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

While the embodiments of the invention have been described above, it should be understood that the embodiments disclosed herein are by way of illustration and not of limitation in all respects. It is intended that the scope of the invention be indicated by the appended claims and that all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

10, 10a, 10b, 10c, 10d: multilayer film
11: sheetfilm
20: Cutting device
21, 21a, 21b:
22: wing plate
23:
31: first pressure-sensitive adhesive layer
60: Protect film
61: Resin film
62: second pressure-sensitive adhesive layer
70: Separate film
100: polarizer
101: first surface
102: second surface
211a and 211b:
212a and 212b:
213a: Maintenance department.

Claims (12)

and a cutting step of cutting a multilayer film having an n-layer (n is an integer of 1 or more) of pressure-sensitive adhesive layers to obtain a sheet from the multilayer film,
Wherein the cutting step includes a pressing step of cutting the multilayered film by advancing a pressure blade from a first surface of the multilayer film to a second surface of the multilayered film to enter the multilayered film,
(1) in the case where the velocity V (占 퐉 / sec) on the first surface of the multilayer film at the pressing edge is the reference pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-th layer, By weight based on the total weight of the sheet.
t / V < 1 /? ₁ (1)
(1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the thickness of the multilayered film measured in terms of dynamic viscoelasticity measured by frequency sweep at 20 deg. (1 / sec) showing a modulus of elasticity of 3.0 x 10 &lt; ⁵ &gt; (Pa). The method according to claim 1, wherein the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer having a minimum storage elastic modulus at a temperature of 20 ° C and an angular frequency of 1,000 radians / second. The pressure-sensitive adhesive sheet according to claim 1, wherein the multilayer film has a separator film of the outermost layer and an adhesive layer below the outermost layer exposed on the outermost surface by peeling the separator film,
And a pressure-sensitive adhesive layer below the outermost layer as the reference pressure-sensitive adhesive layer. 4. The method according to any one of claims 1 to 3, wherein the multilayer film has a polarizer. layered film having a pressure-sensitive adhesive layer of n layers (where n is an integer of 1 or more), and obtaining a sheetfilm from the multilayered film,
Wherein the cutting portion includes a pressure blade arranged to enter the multilayer film from a first surface of the multilayer film toward a second surface of the multilayer film and a control portion for controlling the motion of the pressure blade,
(M / sec) at the first surface of the multilayer film at the compression point, when the pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-layer is used as the reference pressure-sensitive adhesive layer, (1). &Lt; / RTI &gt;
t / V &lt; 1 /? ₁ (1)
(1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the thickness of the multilayered film measured in terms of dynamic viscoelasticity measured by frequency sweep at 20 deg. (1 / sec) showing a modulus of elasticity of 3.0 x 10 &lt; ⁵ &gt; (Pa). 6. The production apparatus of a sheet-fed film according to claim 5, wherein the pressure-sensitive adhesive layer has a minimum pressure-sensitive adhesive layer having a storage elastic modulus at a temperature of 20 DEG C and an angular frequency of 1,000 radians / second as the reference pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet according to claim 5, wherein the multilayer film has a separator film of the outermost layer and an adhesive layer below the outermost layer exposed on the outermost surface by peeling the separator film,
And a pressure-sensitive adhesive layer below the outermost layer as the reference pressure-sensitive adhesive layer. The apparatus according to any one of claims 5 to 7, wherein the multilayer film has a polarizer. 1. A cutting method for cutting a multi-layer film having an n-layer (n is an integer of 1 or more)
And a pressing step of cutting the multilayer film by entering the multilayer film by directing a press blade from a first surface of the multilayer film to a second surface of the multilayer film,
When the velocity V (占 퐉 / sec) on the first surface of the multilayer film at the press-breaking day is the reference pressure-sensitive adhesive layer of any one of the pressure-sensitive adhesive layers of the n-th layer, the following expression (1) A satisfactory multilayer film cutting method.
t / V < 1 /? ₁ (1)
(1), t represents the thickness (mu m) of the multilayered film, and omega ₁ represents the thickness of the multilayered film measured in terms of dynamic viscoelasticity measured by frequency sweep at 20 deg. (1 / sec) showing a modulus of elasticity of 3.0 x 10 &lt; ⁵ &gt; (Pa). The method of cutting a multilayered film according to claim 9, wherein the pressure sensitive adhesive layer has a minimum storage elastic modulus at a temperature of 20 캜 and an angular frequency of 1,000 radians / second as the reference pressure sensitive adhesive layer. The pressure-sensitive adhesive sheet according to claim 9, wherein the multilayer film has a separator film of the outermost layer and an adhesive layer below the outermost layer exposed on the outermost surface by peeling the separator film,
And a pressure-sensitive adhesive layer below the outermost layer as the reference pressure-sensitive adhesive layer. 12. A method according to any one of claims 9 to 11, wherein the multilayer film has a polarizer.

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