KR102035432B1 - Method for manufacturing sheet film - Google Patents

Abstract

This invention is a manufacturing method of the sheet | leaf film which has a cutting process which cut | disconnects the multilayer film which has an adhesive layer of n layer (n is an integer of 1 or more), and obtains a sheet | leaf film from the said multilayer film, The said cutting process is a said cutting edge said A compression process for cutting the multilayer film by entering the multilayer film from the first surface of the multilayer film to the second surface of the multilayer film, wherein the speed V at the first surface of the multilayer film of the plunger blade is included. When (micrometer / second) sets the said adhesive layer in any one of the said adhesive layer of n layer as a reference | standard adhesive layer, the manufacturing method of the sheet | leaf film which satisfy | fills the following relational formula (1) is provided.
t / V <1 / ω ₁ (1)
[In the above relation (1), t represents the thickness (μm) of the multilayer film, and ω ₁ is calculated based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. It represents the frequency (1 / sec) at which the modulus of elasticity shows 3.0 × 10 ⁵ (Pa).]

Description

Manufacturing method of sheet | leaf film {METHOD FOR MANUFACTURING SHEET FILM}

This invention relates to the manufacturing method of the sheet | leaf film which obtains a sheet | leaf film from the multilayer film which has an adhesive layer, and also relates to the manufacturing apparatus of the said multilayer film, and the cutting method of the said multilayer film.

As one of the methods of cutting the multilayer film containing a polarizing plate etc. conventionally, the method of cutting using a piezoelectric blade is known (for example, Unexamined-Japanese-Patent No. 2015-33727 (patent document 1)). Patent Literature 1 describes that as a piezoelectric blade used for cutting a multilayer film, by using a piezoelectric blade whose surface roughness is within a specific numerical range, it is possible to suppress the occurrence of fluff on the cut surface.

Patent Document 1: Japanese Patent Application Laid-Open No. 2015-33727

As described in Patent Literature 1, when the multilayer film was cut using a piezoelectric blade, there were cases in which stem-shaped fine irregularities were generated in the vicinity of the cut portion of the multilayer film surface. When manufacturing a single-layer film by cutting a multilayer film for a mobile device such as a smartphone, since the size of the single-layer film is small and the displayed characters and images are relatively small, the screen is viewed at a very close distance, even if minute irregularities are present. It was easy to be outstanding and was easy to be an appearance defect. The present inventors proceeded to study and found that such a fine stem-shaped unevenness was likely to occur when the multilayer film had an adhesive layer. Then, further studies have been conducted to find a method capable of suppressing such stem-shaped irregularities and to reach the present invention.

An object of this invention is to provide the manufacturing method and manufacturing apparatus of a sheet | seat film, and the cutting method of a multilayer film which can suppress generation | occurrence | production of the microscopic uneven | corrugated stem shape.

This invention provides the manufacturing method, the manufacturing apparatus, and the cutting method of a multilayer film which are shown below.

[1] A method for producing a sheet film having a cutting step of cutting a multilayer film having an adhesive layer of n layers (n is an integer of 1 or more) to obtain a sheet film from the multilayer film,

The cutting step includes a squeezing step of cutting the multi-layer film by directing the plural blade from the first surface of the multi-layer film to the second surface of the multi-layer film to enter the multi-layer film. ,

When the speed V (micrometer / sec) in the 1st surface of the said multilayer film of the said squeezer blade made the said adhesive layer in any one of the said n-type adhesive layer the reference adhesive layer, the following relational formula (1) Method for producing a sheet of film that satisfies.

t / V <1 / ω ₁ (1)

[In the above relation (1), t denotes the thickness (㎛) of the multi-layer film, and ω ₁ is based on the measurement of dynamic viscoelasticity measured by a frequency sweep (掃引) at the temperature of 20 ℃ of the reference pressure-sensitive adhesive layer The calculated storage modulus represents a frequency (1 / sec) showing 3.0 × 10 ⁵ (Pa).]

[2] The sheet film according to [1], wherein the pressure-sensitive adhesive layer having a minimum storage elastic modulus at a temperature of 20 ° C. and an angular frequency of 1,000 radians / sec is used as the reference pressure-sensitive adhesive layer in the pressure-sensitive adhesive layer. Manufacturing method.

[3] The multilayer film has a separator film of the outermost surface layer and an adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of the separate film.

The manufacturing method of the sheet | leaf film as described in [1] which makes the adhesive layer under the said outermost surface layer the said reference adhesive layer.

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

[5] An apparatus for manufacturing a sheet film, having a cutout portion in which a multilayer film having an adhesive layer of n layers (n is an integer of 1 or more) is obtained to obtain a sheet film from the multilayer film.

The cutting unit includes a piezoelectric blade disposed to enter the multilayer film from the first surface of the multilayer film toward the second surface of the multilayer film, and a control unit for controlling the movement of the piezoelectric blade,

The said control part makes the velocity V (micrometer / sec) in the 1st surface of the said multilayer film of the said squeezer blade, when the adhesive layer in any one of the said adhesive layer of n layers is a reference | standard adhesive layer, The manufacturing apparatus of the sheet | leaf film which controls so that (1) is satisfied.

t / V <1 / ω ₁ (1)

[In the above relation (1), t represents the thickness (μm) of the multilayer film, and ω ₁ is calculated based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. It represents the frequency (1 / sec) at which the modulus of elasticity shows 3.0 × 10 ⁵ (Pa).]

[6] The sheet-forming film according to [5], in which the 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 is used as the reference pressure-sensitive adhesive layer.

[7] The multilayer film has a separator film of the outermost surface layer and an adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of the separate film.

The manufacturing apparatus of the sheet | leaf film as described in [5] which makes the adhesive layer under the said outermost surface layer the said reference adhesive layer.

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

[9] A cutting method for cutting a multilayer film having an adhesive layer of n layers (n is an integer of 1 or more),

A crushing step of cutting the multilayer film by directing the plunger blade from the first surface of the multilayer film to the second surface of the multilayer film to enter the multilayer film,

When the speed V (micrometer / sec) in the 1st surface of the said multilayer film of the said squeezer blade made the adhesive layer in any one of the said adhesive layer of n layers the reference adhesive layer, the following relational formula (1) Satisfactory cutting method of multilayer film.

t / V <1 / ω ₁ (1)

[In the above relation (1), t represents the thickness (μm) of the multilayer film, and ω ₁ is calculated based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. It represents the frequency (1 / sec) at which the modulus of elasticity shows 3.0 × 10 ⁵ (Pa).]

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

[11] The multilayer film has a separator film of the outermost surface layer and an adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of the separate film,

The cutting method of the multilayer film as described in [9] which makes the adhesive layer under the said outermost surface layer the said reference 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 apparent from the following detailed description of the invention which is understood in connection with the accompanying drawings.

1 is a schematic diagram schematically showing an example of a cutting step of obtaining a sheet film from a multilayer film.
It is a schematic diagram which shows typically an example of the cutting process which obtains a sheet | leaf film from a multilayer film.
It is a schematic diagram which shows typically an example of the cutting process which obtains a sheet | leaf film from a multilayer film.
It is sectional drawing which shows typically the cutting device which has a piezo blade.
FIG. 5: is a (a) cross section which shows an example of a piezoelectric blade member, (b) a perspective view from a lower surface, and (c) bottom view.
It is a figure which shows typically the cutting | disconnection operation by a piezoelectric blade.
FIG. 7 is a bottom view showing an example different from that of FIG. 5 of the piezoelectric blade member. FIG.
FIG. 8 is an image diagram showing fine stem-shaped irregularities occurring near the cut surface of the multilayer film surface. FIG.
It is a schematic sectional drawing which shows an example of the specific laminated constitution of a multilayer film typically.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described referring drawings, this invention is not limited to the following embodiment. In all the following drawings, the scales are appropriately adjusted in order to make each component easy to understand, and the scale of each component shown in the drawings and the scale of the actual components do not necessarily coincide.

[Method for producing sheet film]

The manufacturing method of the sheet | seat film which concerns on this embodiment has a cutting process which cut | disconnects the multilayer film which has an adhesive layer of n layer (n is an integer of 1 or more), and obtains a sheet | leaf film from a multilayer film. The cutting process includes a pressing process of cutting the multilayer film by directing the piezoelectric blade from the first surface of the multilayer film to the second surface of the multilayer film to enter the multilayer film.

In the crushing step, when the speed V (micrometer / second) in the 1st surface of the multilayer film of a squeezed blade uses the adhesive layer in any one of said n-type adhesive layer as a reference | standard adhesive layer, the following relational formula (1 Satisfies)

t / V <1 / ω ₁ (1)

In the above relational expression (1), t denotes the thickness (㎛) of the multi-layer film, ω ₁ is the storage was calculated on the basis of the measurement of the dynamic viscoelasticity measured by a frequency sweep at the temperature of 20 ℃ of the reference adhesive layer modulus Frequency (1 / sec) showing 3.0 x 10 ⁵ (Pa) is shown.

By the speed V (micrometer / sec) in the 1st surface of the multilayer film of a squeezed blade satisfying the said Formula (1), it can suppress that the unevenness | corrugation generate | occur | produces in a reference | standard adhesive layer in a crushing process, and, as a result, a multilayer It can suppress that stem-shaped minute unevenness | corrugation arises in the vicinity of the cut surface of a film surface. It is preferable that it is an adhesive layer which is easy to produce a fine unevenness | corrugation in a crushing process as a reference | standard adhesive layer. The detail of the selection method of a standard adhesive layer is mentioned later.

The present inventors found out that there is a correlation between the viscoelastic characteristics of the pressure-sensitive adhesive layer and the ease of the occurrence of minute unevenness in the pressure-sensitive adhesive layer. The minute unevenness generated in the pressure-sensitive adhesive layer is the cause of the minute unevenness generated on the surface of the multilayer film. The viscoelastic property of the pressure-sensitive adhesive layer in the pressure-reduction step depends on the passage speed of the pressure-sensitive blade passing through the pressure-sensitive adhesive layer. If the estimated time (t / V) for the piezoelectric blade to pass through the first surface of the multilayer film and reach the second surface is sufficiently short, the viscoelastic properties of the pressure-sensitive adhesive layer are appropriate. In the adhesive layer, minute unevenness becomes less likely to occur, and as a result, fine unevenness is unlikely to occur even near the cut surface of the multilayer film surface. It is early. In addition, although the speed V (micrometer / sec) is the speed in the 1st surface of a multilayer film of a piezoelectric blade, since the speed in a multilayer film of a piezoelectric blade can also be controlled to become almost the same speed, the 1st surface of a multilayer film The time taken to pass through to reach the second surface can be regarded as almost coinciding with the estimated time (t / V). Usually, the approximation time (t / V) is less than 9.0 × 10 ⁻³ (seconds). However, the suppression time (t / V) is preferably less than 2.5 × 10 ⁻³ (seconds) in suppressing occurrence of minute unevenness on the multilayer film surface. Do. In addition, the estimated time (t / V) is usually 1.0 × 10 ⁻⁴ (seconds) or more.

In view of the fact that the minute unevenness generated in the pressure-sensitive adhesive layer can be further suppressed, the speed V (μm / sec) at the first surface of the multilayer film of the squeezed blade is any one of the n-type pressure-sensitive adhesive layers in the crushing step. In the case where the pressure-sensitive adhesive layer is a reference pressure-sensitive adhesive layer, it is preferable to satisfy the above relational expression (1) and satisfy the following relational expression (2).

t / V <1 / ω ₂ (2)

In the relational formula (2), t denotes the thickness (μm) of the multilayer film similarly to the relational formula (1), and ω ₂ is based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. The storage elastic modulus computed by this is shown as the frequency (1 / sec) which shows 6.0x10 <^5> (Pa).

<Cutting process>

1-3 is a schematic diagram which shows typically an example of the cutting process which cuts a multilayer film and obtains a sheet | leaf film from a multilayer film, respectively. In FIGS. 1-3, the dotted line shows the cutting line in a cutting process. In the example shown in FIG. 1, the elongate multilayer film 10a is cut | disconnected in the direction orthogonal to a longitudinal direction (FIG. 1 (a)) using the squeezed blade of which the blade edge is a straight line, and subdivided the multilayer film 10b. ) (FIG. 1 (b)), and then, the small-sized multilayer film 10b is cut | disconnected in the longitudinal direction of the original multilayer film 10a using the straight-shaped piezoelectric blade (FIG. 1). (b)), the sheet | leaf film 11 of a desired size is obtained (FIG. 1 (c)).

In the example shown in FIG. 2, the elongate multilayer film 10a is punched and cut by the squeezing blade of the shape like a mold (FIG. 2 (a)), and the sheet | leaf film 11 of a desired size is obtained (FIG. 2 (b)). ).

In the example shown in FIG. 3, the elongate multilayer film 10a is cut | disconnected in the direction orthogonal to a longitudinal direction (FIG. 3 (a)) using the squeezed blade with a straight blade edge | tip (FIG. 3 (a)), and cut into small pieces the multilayer film 10c. ) (FIG. 3 (b)), and then punching out with a squeezed blade shaped like a mold to obtain a sheet film 11 of a desired size (FIG. 3 (c)).

The cutting direction of the cutting process shown in FIGS. 1-3 is not specifically limited, When cutting the multilayer film which has an orientation characteristic, a cutting direction is determined so that the sheet | leaf film 11 which has a desired orientation characteristic can be obtained. do.

In each example shown in FIGS. 1-3, one or several sheet | seat sheets can be obtained from a multilayer film through one or several cutting | disconnections. The number of times of cutting in a cutting process is not limited. In addition, although the case where all the cutting | disconnection in a cutting process is a pressing process was demonstrated above, if any one cutting is a pressing process, it is not limited, The cutting by a laser beam, the cutting by rotation of a round blade other than a cutting process, etc. are mentioned. The cutting process may be included. That is, what is necessary is just to include the cut | disconnected surface by a crushing process in the sheet | seat film obtained. According to the squeezing step, stem-shaped minute unevenness tends to occur in the vicinity of the cutout portion of the multilayer film surface, but in this embodiment, even when all cutting is a crushing step, occurrence of such stem-shaped minute unevenness can be suppressed.

<Compression process>

It is a schematic diagram which shows typically the cutting device which has a piezo blade. By the cutting device 20 shown in FIG. 4, the pressing process which concerns on this embodiment can be implemented. The cutting device 20 is a multilayer film in which the squeezing blade member 21 which has a squeezing blade, the control part 24 which controls the vertical movement of the squeezing blade member 21, and the blade receiving plate 22 are provided in the upper surface. The mounting table 23 which arranges the 10 is provided. The multilayer film 10 is disposed on the mounting table 23 so as to contact the support plate 22. In the multilayer film 10 disposed on the mounting table 23, the surface in contact with the blade plate 22 is the second surface 102, and the upper surface opposite the second surface 102 is the first surface. It is set to (101). In the squeezing process, the squeezing blade member 21 moves downward so that the squeezing blade enters the multilayer film 10 from the first surface 101 of the multilayer film 10 toward the second surface 102. Thereafter, the piezoelectric blade member 21 moves upward so that the piezoelectric blade is spaced apart from the multilayer film 10. The multilayer film 10 is cut by this vertical movement of the piezoelectric blade member 21.

FIG. 5A is a cross-sectional view showing in detail the piezoelectric blade member 21a which is an example of the piezoelectric blade member 21 shown in FIG. 4. FIG.5 (b) shows the perspective view from the lower surface of the piezoelectric blade member 21a, and sectional drawing a-a of FIG.5 (b) is corresponded to FIG.5 (a). FIG. 5C shows a bottom view of the piezoelectric blade member 21a. The piezoelectric blade member 21a includes a squeezed blade 211a having a straight blade end portion, a holding portion 213a holding the plunging blade 211a, and an elastic body 212a disposed on the lower surface of the holding portion 213a. Equipped. The lowermost surface of the elastic body 212a is the same as the blade tip of the piezoelectric blade 211a or located below the blade tip of the piezoelectric blade 211a.

6 (a) to 6 (c) show a case where the multilayer film 10 is cut by the cutting device including the plural blade members 21a shown in FIGS. 5 (a) to 5 (c). It is a figure which shows typically the cutting | disconnection operation by the piezoelectric blade 211a. As for the cutting operation | movement, the piezoelectric blade member 21a moves downward (FIG. 6 (a)), and the lowest surface of the elastic body 212a of the piezoelectric blade member 21a is the first surface 101 of the multilayer film 10. (FIG. 6B). Thereafter, the piezoelectric edge member 21a further moves downward, so that the elastic body 212a contracts on the first surface 101 of the multilayer film 10, and only the piezoelectric edge 211a is used to make the multilayer film 10 1, from the surface 101 into the multilayer film 10, the entry is continued until the blade plate 22 is reached (Fig. 6 (c)). When the piezoelectric blade 211a reaches the blade receiving plate 22, the moving direction of the piezoelectric blade member 21 is switched upward, and the piezoelectric blade 211a is pulled out of the multilayer film 10. By the above cutting operation, the multilayer film 10 is cut in the lamination direction.

The piezoelectric blade 211a included in the piezoelectric blade member 21a is limited to a piezoelectric blade capable of linearly cutting the multilayer film 10 as shown in FIGS. 5A to 5C. No, it can be designed to enable the desired cutting. It may be a piezoelectric blade having the same shape as a mold capable of punching a rectangular sheet film from the multilayer film 10. The bottom view of the example of the piezoelectric blade member provided with the piezoelectric blade of the same shape as the mold is shown in FIG. 7. The piezoelectric blade member 21b shown in FIG. 7 is equipped with the piezoelectric blade 211b, the holding member, and the elastic body 212b, and the piezoelectric blade member shown in FIG. 5 except the point where the shape of the piezoelectric blade 211b differs. It is the same structure as 21a), and the multilayer film 10 can be cut | disconnected by the same method.

Thomson blades are preferably used as the piezoelectric blades 211a and 211b. The Thomson blade may be resin-treated on its surface. The elastic bodies 212a and 212b are not limited as long as they can shrink on the surface of the multilayer film and can fix the multilayer film by sandwiching the multilayer film 10 together with the blade plate 22 at the time of cutting. Porous materials, such as these, and soft materials, such as a urethane rubber, etc. are used preferably.

In the cutting device which concerns on this embodiment, the control part 24 is the lower part of the piezoelectric blade member 21 so that the speed V (micrometer / sec) in the 1st surface of the multilayer film of a piezoelectric blade will satisfy the relational expression (1). To control the speed of movement.

<Other processes>

The manufacturing method of the sheet | leaf film which concerns on this embodiment may be equipped with processes other than the cutting process mentioned above, For example, the multilayer film manufacturing process which manufactures a multilayer film, the unwinding process of unwinding the multilayer film wound in roll shape, and multilayer The conveyance process of conveying a film or a sheet | seat film, the drying process of drying a multilayer film or a sheet | seat film, etc. are mentioned.

<Multilayer film>

The multilayer film is not particularly limited as long as it has an adhesive layer. The multilayer film is, for example, an optical laminated film. In the case of an optical laminated film, even a slight unevenness | corrugation tends to become a visual problem. The thickness of a multilayer film is 5-3000 micrometers, for example, Preferably it is 20-500 micrometers. It is preferable that the laminated constitution of a multilayer film is a laminated constitution in which an adhesive layer is not exposed to an outermost surface so that dirt may not adhere to an adhesive layer in a cutting process.

When a multilayer film has an adhesive layer, when cutting using a piezoelectric blade, the stem-shaped minute unevenness | corrugation tends to arise in the vicinity of the cut surface of a multilayer film surface, but according to the manufacturing method of the sheet | leaf film of this embodiment, such a fine unevenness | corrugation Can be suppressed. More specifically, the minute unevenness is often a stem-shaped convex line extending in a direction substantially parallel to the cut surface, and often occurs on the second surface in contact with the blade support plate. The mechanism by which the minute unevenness occurs is one of the mechanisms that can be considered, although it is not clear, because different shear stresses are generated in each layer due to the ingress of the piezoelectric blade, and the difference in the shear stresses acting on the two layers in contact with the pressure-sensitive adhesive layer. It is mentioned that an adhesive layer deform | transforms locally locally. This local deformation is presumed to be due to the pressure-sensitive adhesive layer being soft compared to other layers.

FIG. 8 is an image diagram showing fine stem-shaped irregularities occurring near the cut surface of the multilayer film surface. FIG. The mechanism by which the minute unevenness explained using FIG. 8 is one mechanism which can be considered, and the minute unevenness suppressed by the manufacturing method of the sheet | leaf film of this embodiment is limited to the unevenness | corrugation which arises by such a mechanism. It is not limited to the minute unevenness shown schematically in FIG. 8. In FIG. 8, the multilayer film which consists of the layer 101, the adhesive layer 102, and the layer 103 is assumed as the multilayer film 10 to be cut | disconnected. When the piezoelectric blades 211 enter the multilayer film 10, different shear stresses are generated in each layer, and the pressure-sensitive adhesive layer 102 is softer than the layers 101 and 103 adjacent thereto. Due to the difference in the shear stresses acting on (101, 103), the area near the cut surface of the pressure-sensitive adhesive layer 102 is slightly raised to form the convex line 102a. Due to the convex line 102a of the pressure-sensitive adhesive layer 102, the layer 103 adjacent to the pressure-sensitive adhesive layer 102 may also be slightly raised to form the convex line 103a. In this way, the convex line 102a formed in the adhesive layer 102 and the convex line 103a formed in the layer 103 become a cause of the stem-shaped unevenness visually recognized.

(Adhesive layer)

An adhesive layer can be comprised by the adhesive composition which has resin, such as (meth) acrylic-type, rubber type, urethane type, ester type, silicone type, and polyvinyl ether type as a main component. Especially, the adhesive composition which uses (meth) acrylic-type resin which is excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is suitable. An adhesive composition may be an active energy ray hardening type or a thermosetting type.

As (meth) acrylic-type resin (base polymer) used for an adhesive composition, For example, (meth) acrylic acid, such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate Polymers or copolymers containing one or two or more kinds of esters as monomers are suitably used. It is preferable to copolymerize a polar monomer to a base polymer. Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl. The monomer which has a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group etc. like a (meth) acrylate is mentioned.

Although the adhesive composition may include only the said base polymer, it usually contains a crosslinking agent further. As a crosslinking agent, it is a bivalent or more metal ion, and forms a carboxylate metal salt between a carboxyl group; It is a polyamine compound and forms an amide bond between carboxyl groups; Polyepoxy compounds and polyols, forming ester bonds with carboxyl groups; It is a polyisocyanate compound and what forms an amide bond between carboxyl groups is illustrated. Especially, a polyisocyanate compound is preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays or electron beams, and can be adhered to adherends such as a film with adhesiveness even before irradiation with active energy rays. It is an adhesive composition which has the property which hardens by and can adjust adhesion force. It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curing 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. Moreover, a photoinitiator, a photosensitizer, etc. may be included as needed.

The pressure-sensitive adhesive composition is composed of fine particles, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powders and other inorganic powders, etc.), antioxidants, and ultraviolet rays for imparting light scattering properties. Additives such as absorbents, dyes, pigments, colorants, antifoams, corrosion inhibitors, photopolymerization initiators, and the like may be included.

It can form by apply | coating and drying the organic solvent dilution liquid of the said adhesive composition on a base material. When using an active energy ray hardening-type adhesive composition, it can be set as the hardened | cured material which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

The thickness of an adhesive layer may be 1-40 micrometers, for example. When the thickness of the pressure-sensitive adhesive layer is 1 to 40 µm, the stem-shaped minute unevenness is likely to occur by the crushing step, but according to the production method of the single-layer film of the present embodiment, even if the thickness of the pressure-sensitive adhesive layer is 1 to 40 µm, the shape of the stem Occurrence of minute unevenness can be suppressed.

The pressure-sensitive adhesive layer may have a storage modulus of 0.15 to 1 MPa at a temperature of 20 ° C. and an angular frequency of 1,000 radians / second. When the pressure-sensitive adhesive layer is such a storage elastic modulus, it is often softer than other layers, and minute unevenness is likely to occur, but according to the manufacturing method of the single-layer film of the present embodiment, the storage elastic modulus at a temperature of 20 ° C. of the pressure-sensitive adhesive layer is 0.15. Even if it is -1 MPa, generation | occurrence | production of a micro unevenness can be suppressed.

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

As a method for adjusting a storage elastic modulus to the said range, an oligomer, specifically urethane (meth) acrylate type oligomer is further added to the adhesive composition containing a base polymer or a crosslinking agent, and an active energy ray hardening-type adhesive composition (Preferably an ultraviolet curable adhesive composition) is mentioned. More preferably, an active energy ray is irradiated to harden an adhesive layer suitably.

(Reference adhesive layer)

The multilayer film used or manufactured by the manufacturing method of the sheet | leaf film of this embodiment has an adhesive layer of n layer (n is an integer of 1 or more). When the pressure-sensitive adhesive layer contained in the multilayer film is one layer, the speed of the piezoelectric blade is controlled so as to satisfy the above relational expression (1) by using the pressure-sensitive adhesive layer as a reference pressure-sensitive adhesive layer. When there are multiple adhesive layers contained in a multilayer film, it is preferable to make the adhesive layer with the knowledge that it is easy to produce an unevenness | corrugation in a crushing process as a reference adhesive layer. MEANS TO SOLVE THE PROBLEM This inventor acquired the knowledge that the adhesive layer illustrated to i) and ii) below is easy to produce an unevenness | corrugation in a crushing process, and illustrates it as a reference | standard adhesive layer.

i) the pressure-sensitive adhesive layer having a minimum storage modulus at a temperature of 20 ° C.,

ii) The adhesive layer under an outermost surface layer in the structure which a multilayer film has the separator film of an outermost surface layer, and the adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of a separate film.

Moreover, in the manufacturing method of the sheet | leaf film of this embodiment, even when any of the n-layer adhesive layer is used as a reference | standard adhesive layer, it is preferable that the speed | rate of a piezoelectric blade satisfy | fills relational formula (1).

(Layer structure example of multilayer film)

FIG. 9 is a schematic cross-sectional view schematically showing an example of a specific layer configuration of a multilayer film used or produced in the method for producing 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 thereof, and a first pressure sensitive adhesive layer laminated on the other surface. (31) and the peelable separate film 70 for temporarily protecting the 1st adhesive layer 31 are laminated | stacked on the outer surface of the 1st adhesive layer 31. FIG. On the other hand, the surface (surface to which the protective film 60 is bonded) in the protective film 60 side in the polarizing plate 100, and the surface (first adhesive layer 31 in which the first pressure sensitive adhesive layer 31 side is bonded) Surface) can be, for example, the surface of a protective film, another optical film or a layer added on the film.

One side of the protective film 60 is adhesive, the other side is non-tacky, and may be laminated to the polarizing plate 100 by bonding to one side of the adhesive. As such a protective film 60, what is called a self-adhesive protective film is mentioned. A self-adhesive protective film is a resin film which consists of the non-adhesive resin layer 61 which consists of non-adhesive resin, and the adhesive resin layer 62 which consists of self-adhesive resin, for example. As a self-adhesive protective film, "Doretec" (Toray Film Co., Ltd.) etc. are mentioned, for example. Moreover, the protective film comprised from the resin film (base film) 61 and the 2nd adhesive layer 62 laminated | stacked on it, and laminated | stacked and laminated | stacked on the polarizing plate 100 via this adhesive layer is mentioned as an example. When the protective film 60 has the 2nd adhesive layer 62, the said storage elastic modulus is larger than the said storage elastic modulus of a 1st adhesive layer normally.

The polarizing plate 100 is a polarizing element including at least the polarizer and the first pressure sensitive adhesive layer 31, and usually further includes a protective film bonded to one or both surfaces of the polarizer. In addition to the protective film, the polarizing plate 100 may include 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 through an adhesive layer or an adhesive layer. The polarizing plate 100 may or may not contain an adhesive layer. When including an adhesive layer, the adhesive layer contained in the polarizing plate 100 becomes one of the n-layer adhesive layers contained in a multilayer film.

The thickness of the polarizing plate 100 is 20-200 micrometers normally, Preferably it is 30-150 micrometers, More preferably, it is 40-120 micrometers, More preferably, it is 50-100 micrometers.

The multilayer film 10d laminates another raw material film which is continuously unwound from the film roll in a similar manner to the raw material film that is continuously unwound from the film roll and is conveyed, and wound up the obtained long lamination film in a roll shape. What is produced by the so-called roll-to-roll system, or the multilayer film obtained by further cutting this may be sufficient. In the manufacturing method of the sheet | seat film which concerns on this embodiment, the multilayer film 10d is cut | disconnected in a cutting process, and a sheet | seat film is manufactured.

When the multilayer film 10d includes the first pressure sensitive adhesive layer 31 and the second pressure sensitive adhesive layer 62 together as the pressure sensitive adhesive layer, the first pressure sensitive adhesive layer 31 on which the peelable separator film 70 is laminated is placed. It is easy to produce a fine unevenness | corrugation normally in this rolling process. It is thought that this may be due to the separation of the separate film 70 once due to the action of the shear stress, or the displacement of the adhesive layer to be fixed.

When cutting the multilayer film 10d with the cutting device shown in FIG. 4, the separate film 70 made the protective film 60 side into a 1st surface, and the separate film 70 side into a 2nd surface. It may be arrange | positioned and cut | disconnected on the mounting base 23 so that it may contact this blade board 22, and the protective film 70 side may be made into a 1st surface, and the protective film 60 side may be made into a 2nd surface, and is protected. The resin film 61 constituting the film 60 may be disposed and cut on the mounting table 23 so as to contact the blade support plate 22. According to the manufacturing method of the sheet | leaf film of this embodiment, even if the multilayer film 10d is arrange | positioned in any direction, generation | occurrence | production of the stem unevenness | corrugation by a crushing process can be suppressed.

Although the shape of the uncut multilayer film 10d is not specifically limited, Typically, it is a precision (band shape). Although the length in the longitudinal direction and the width direction of the uncut multilayer film 10d are not particularly limited, the length in the longitudinal direction of the multilayer film 10d is usually 100 m to 20,000 m, and the length in the width direction is 1,000 mm to 1500 mm. In addition, after cutting the multilayer film 10d into the small piece multilayer film 10d, you may provide it to a rolling process. In this case, although the shape of the small piece multilayer film 10d is not specifically limited, It is preferable to have a rectangular shape which has a long side and a short side, and is rectangular generally. The length of the long side and the short side is not particularly limited, but for example, 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 | leaf film is preferably rectangular shape, More preferably, it is rectangular shape which has a long side and a short side. This rectangular shape is preferably rectangular. When the sheet | leaf film is rectangular, the length of a long side is 50 mm-300 mm, for example, Preferably it is 70 mm-200 mm. The length of the short side is 30 mm-200 mm, for example, Preferably it is 40 mm-100 mm. Although the minute unevenness which arises in the surface of the sheet | seat film | membrane of a cut surface vicinity in a crushing process is easy to be noticeable as the size of a sheet | membrane film is small, it becomes easy to become an external defect, but according to the manufacturing method of the sheet | seat film of this embodiment, Even if the size of is small, minute unevenness can be prevented from occurring.

(1) polarizer

The polarizer is an absorption type polarizer having the property of absorbing linearly polarized light having a vibration plane parallel to the absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis), and polyvinyl alcohol. The polarizing film which made the dichroic dye adsorb | suck-oriented to the resin film can be used suitably. The polarizer is, for example, uniaxially stretching the polyvinyl alcohol-based resin film; Adsorbing a dichroic dye by dyeing 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 boric acid solution; And the process of washing with water after treatment with an aqueous boric acid solution.

It is preferable that it is 50 micrometers or less, and, as for the thickness of a polarizer, it is more preferable that it is 30 micrometers or less. Setting the thickness of the polarizer to 30 µm or less is advantageous for thinning of the polarizing plate 100 and further, an image display device. The thickness of a polarizer is 2 micrometers or more (for example, 5 micrometers or more) normally.

(2) protective film

The protective film which can be laminated on one or both surfaces of the polarizer is a transparent resin having a light transmitting property (preferably optically transparent), for example, a linear polyolefin resin (such as polypropylene resin) or a cyclic polyolefin resin (norbornene resin). Polyolefin resins such as); Cellulose resins such as triacetyl cellulose and diacetyl cellulose; Polyester resins such as polyethylene terephthalate and polybutylene terephthalate; Polycarbonate resins; (Meth) acrylic resins such as methyl methacrylate resin; Polystyrene resin; Polyvinyl chloride resins; Acrylonitrile butadiene styrene resin; Acrylonitrile-styrene resins; Polyvinyl acetate type resin; Polyvinylidene chloride-based resins; Polyamide-based resins; Polyacetal resins; Modified polyphenylene ether resins; Polysulfone resins; Polyether sulfone resin; Polyarylate resins; Polyamideimide resin; It may be a film made of polyimide resin or the like. Especially, it is preferable to use polyolefin resin and cellulose resin. In addition, in this specification, "(meth) acrylic-type resin" represents at least 1 sort (s) chosen from the group which consists of acrylic resin and methacryl-type resin. The same applies to other terms in which "(meth)" is added.

Although the thickness of a protective film is 1-100 micrometers normally, it is preferable that it is 5-60 micrometers from a viewpoint of strength, handleability, etc., and it is more preferable that it is 5-50 micrometers.

At least one of the protective films has a hard coat layer, an antiglare layer, a light diffusion layer, a retardation layer (such as a retardation layer having a retardation value of 1/4 wavelength), an antireflection layer, on its outer surface (the surface opposite to the polarizer), A surface treatment layer (coating layer) such as an antistatic layer, an antifouling layer, or an optical layer may be provided.

The protective film can be bonded to the polarizer via, for example, an adhesive layer. As an adhesive agent which forms an adhesive bond layer, an aqueous adhesive agent, an active energy ray curable adhesive agent, or a thermosetting adhesive agent can be used, Preferably it is an aqueous adhesive agent and an active energy ray curable adhesive agent.

(3) other optical film

The polarizing plate 100 may include other optical films other than a polarizer and a protective film, and typical examples thereof are a brightness enhancing 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 1st adhesive layer 31 is an adhesive layer arrange | positioned at the outermost surface of the polarizing plate 100, and it can use for bonding a multilayer film to an image display element (for example, liquid crystal cell) or another optical member. Although the thickness of the 1st adhesive layer 31 may be 1-40 micrometers, 3-25 micrometers (the viewpoint of suppressing the dimensional change of the polarizing plate 100, maintaining the viewpoint of thinning of the polarizing plate 100, and favorable workability). For example, 3-20 micrometers, Furthermore, 3-15 micrometers) is preferable. As for the material of the 1st adhesive layer 31, description in the above-mentioned adhesive layer is applied as it is.

(5) separate film

The separator film 70 is a film that is temporarily attached to protect the surface thereof until the first pressure sensitive adhesive layer 31 is bonded to an image display element (for example, a liquid crystal cell) or another optical member. The separator film 70 is usually composed of a thermoplastic resin film subjected to a release treatment on one surface thereof, and the release treated surface is bonded to the first pressure sensitive adhesive layer 31. The thermoplastic resin constituting the separator film 70 may be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate. The above-mentioned separate film may be adhered to the surface of the third pressure-sensitive adhesive layer 32 in order to temporarily attach and protect the surface until the optical film such as the brightness enhancement film 50 is bonded. The thickness of the separate film 70 is 10-100 micrometers, for example. When the storage elastic modulus of the first pressure sensitive adhesive layer 31 is 0.15 to 1 MPa, the thickness of the separate film directly contacting the first pressure sensitive adhesive layer 31 is 50 μm or less. Since fine unevenness | corrugation often arises in the layer 31, the method of this invention is applied preferably.

(6) copy protection film

The protect film 60 is comprised from the resin film 61 and the non-adhesive resin layer 62 or the 2nd adhesive layer 62 laminated | stacked on it. The protective film 60 is a film for protecting the surface of the polarizing plate 100, and usually, for example, the adhesive resin layer 62 or the second having it after the polarizing plate having the protective film is bonded to an image display element or another optical member. Peeling removal is carried out for every adhesive layer 62.

The resin constituting the resin film 61 is, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as polycarbonate resin. Can be. Preferably, it is polyester resin, such as polyethylene terephthalate. Although the resin film 61 may be a single layer structure or a multilayer structure, it is preferably a single layer structure from a viewpoint of manufacture ease, manufacturing cost, etc. Regarding the second pressure sensitive adhesive layer 62, the technique related to the first pressure sensitive adhesive layer 31 described above is cited.

[Production apparatus of sheet film]

The manufacturing apparatus of the sheet | leaf film which concerns on this embodiment cut | disconnects the multilayer film which has an adhesive layer, and has a cut | disconnected part which obtains a sheet | leaf film from a multilayer film. The cut portion has a plunger blade disposed to be able to enter the multilayer film from the first surface of the multilayer film to the second surface of the multilayer film. Regarding the cutout portion, the description of the above-described cutting device in the method for manufacturing the single sheet film is applied as it is. Regarding the multilayer film, the description of the above-described multilayer film in the method for producing a single sheet film is applied as it is.

The manufacturing apparatus of the sheet | leaf film which concerns on this embodiment may be equipped with components other than the cut part mentioned above, For example, the multilayer film manufacturing part which manufactures a multilayer film, the unwinding part which unwinds the multilayer film wound in roll shape, and a multilayer A conveyance part which conveys a film or a sheet | seat film, the drying part which dries a multilayer film or a sheet | seat film, etc. are mentioned.

[Cutting Method of Multi-Layer Film]

The cutting method of the multilayer film which concerns on this embodiment includes the crushing process which cut | disconnects a multilayer film by directing a piezoelectric blade from the 1st surface of a multilayer film to the 2nd surface of a multilayer film, and entering into a multilayer film. Regarding the cutting method, the description of the above-described cutting step in the method of manufacturing the sheet film is applied as it is.

Example

Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited by these examples.

[Multilayer Film A]

As the 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 having a long side length of 300 mm x 210 mm length side was used. The COP polarizing plate with a protective film is a protective film (58 μm) from above, a TAC film (25 μm) as a protective film, a PVA film (12 μm) as a polarizer, a COP film (23 μm), a first pressure-sensitive adhesive layer (20 μm). ) And a PET film (38 μm) as a separate film is laminated. One side of the protective film was adhesive, the other side was non-tacky, and one side of the adhesive was in contact with and bonded to the TAC film.

As for the 1st adhesive layer, the storage elastic modulus at the temperature of 20 degreeC and angular frequency of 1,000 radians / sec was 0.34 Mpa. Regarding the multilayer film A, the first pressure sensitive adhesive layer is a reference pressure sensitive adhesive layer. Regarding the reference pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer), dynamic viscoelastic properties were measured by frequency sweep at a temperature of 20 ° C. using a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC, and the storage modulus was based on the measured values. The frequency ω ₁ showing this 3.0 × 10 ⁵ (Pa) was derived, and it was 1.20 × 10 ² (1 / sec). Similarly, the frequency ω ₂ showing the storage modulus of 6.0 × 10 ⁵ (Pa) was derived based on the measured value, which was 6.03 × 10 ² (1 / sec).

[Multilayer Film B]

As for the multilayer film B, the thickness of a 1st adhesive layer is 15 micrometers using the adhesive composition different from the adhesive composition which comprises the 1st adhesive layer of multilayer film A as an adhesive composition which comprises a 1st adhesive layer, and a multilayer film It is the same structure as multilayer film A except the thickness of B being 180 micrometers. As for the 1st adhesive layer, the storage elastic modulus at the temperature of 20 degreeC and angular frequency of 1,000 radians / sec was 0.65 Mpa. As for the multilayer film B, the 1st adhesive layer was made into the reference adhesive layer. Regarding the reference pressure-sensitive adhesive layer, dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. was performed using a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC, and the storage modulus was 3.0 x 10 ⁵ (based on the measured value. The frequency ω ₁ showing Pa) was derived and found to be 1.62 × 10 (1 / sec). Similarly, the frequency ω ₂ showing the storage modulus of 6.0 × 10 ⁵ (Pa) was derived based on the measured value, which was 1.38 × 10 ² (1 / sec).

Example 1

(Cutting test)

The cutting test was performed using the cutting device shown in FIG. 4 provided with the piezoelectric blade member 21a shown in FIG. As the squeezed blade 211a of the squeezed blade member 21a, a Thompson blade (manufactured by Ogino Seiki Seisakusho Co., Ltd.) having a length of 614 mm in the longitudinal direction was used.

First, the multilayer film A was arrange | positioned on the mounting table 23 so that the blade board 22 might contact. At this time, the PET film (58 micrometers) which comprises a protective film was located in the upper side, and it arrange | positioned so that the PET film (38 micrometers) as a separate film may be located in the lower side. Then, the piezoelectric blade 211a enters the multilayer film A such that the velocity at the surface of the protective film is 7.6 × 10 ⁴ (µm / sec), and is cut in a direction orthogonal to the absorption axis to form a COP polarizing plate having a protective film. Divided into two.

(Evaluation of stem irregularities generation)

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

Example 2

In the cutting test, the cutting test was carried out in the same manner as in Example 1 except that the piezoelectric blade 211a was made to enter the multilayer film A so that the speed at the surface of the protective film was 1.2 × 10 ⁵ μm / sec. The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

Example 3

In the cutting test, except that the multilayer film B was used instead of the multilayer film A, and the piezoelectric edge 211a was inserted into the multilayer film B such that the speed at the surface of the protective film was 2.1 × 10 ⁴ μm / sec. A cutting test was performed in the same manner as in Example 1 to evaluate the presence or absence of stem-shaped irregularities. The evaluation results are shown in Table 1.

Example 4

In the cutting test, the cutting test was carried out in the same manner as in Example 3 except that the piezoelectric blade 211a was made to enter the multilayer film B so that the speed at the surface of the protective film was 7.6 × 10 ⁴ μm / sec. The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

Comparative Example 1

In the cutting test, the cutting test was carried out in the same manner as in Example 1 except that the piezoelectric blade 211a was made to enter the multilayer film A so that the speed at the surface of the protective film was 6.6 × 10 ³ μm / sec. The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

Comparative Example 2

In the cutting test, the cutting test was carried out in the same manner as in Example 1 except that the piezoelectric blade 211a was made to enter the multilayer film A so that the speed at the surface of the protective film was 2.1 × 10 ⁴ μm / sec. The presence or absence of irregularities was evaluated. The evaluation results are shown in Table 1.

Although embodiment of this invention was described, it is to be considered that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the invention is indicated by the claims, and it is intended to include any modification within the scope and meaning equivalent to the claims.

10, 10a, 10b, 10c, 10d: multilayer film
11: single sheet film
20: cutting device
21, 21a, 21b: absent edge member
22: blade
23: placement table
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, 211b: tack blade
212a and 212b: elastic bodies
213a: Maintenance.

Claims (18)

As a manufacturing method of the sheet | leaf film which has a cutting process which cut | disconnects the multilayer film which has an adhesive layer of n layer (n is an integer of 1 or more), and obtains a sheet | leaf film from the said multilayer film,
The cutting step includes a pressing step of cutting the multilayer film by directing the piezoelectric blade from the first surface of the multilayer film to the second surface of the multilayer film and entering the multilayer film,
When the speed V (micrometer / sec) in the 1st surface of the said multilayer film of the said squeezer blade made the said adhesive layer in any one of the said n-type adhesive layer the reference adhesive layer, the following relational formula (1) Method for producing a sheet of film that satisfies.
t / V <1 / ω ₁ (1)
[In the above relation (1), t represents the thickness (μm) of the multilayer film, and ω ₁ is calculated based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. It represents the frequency (1 / sec) at which the modulus of elasticity shows 3.0 × 10 ⁵ (Pa).] The method for producing a single-layer film according to claim 1, wherein the 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 in the pressure-sensitive adhesive layer is used as the reference pressure-sensitive adhesive layer. The said multilayer film has a separator film of an outermost surface layer, and the adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of the said separate film,
The manufacturing method of the sheet | seat film which makes the adhesive layer under the said outermost surface layer the said adhesive layer. The method of claim 1, wherein the multilayer film has a polarizer. The method of claim 1, wherein the reference pressure-sensitive adhesive layer has a thickness of 1 to 20 µm. The method for producing a sheet of film according to any one of claims 1 to 5, wherein the piezoelectric blade is a Thompson blade. As a manufacturing apparatus of the sheet | leaf film which has a cut part which cuts the multilayer film which has an adhesive layer of n layer (n is an integer of 1 or more), and obtains a sheet | leaf film from the said multilayer film,
The cutting unit includes a piezoelectric blade disposed to enter the multilayer film from the first surface of the multilayer film toward the second surface of the multilayer film, and a control unit for controlling the movement of the piezoelectric blade,
The said control part makes the velocity V (micrometer / sec) in the 1st surface of the said multilayer film of the said squeezer blade, when the adhesive layer in any one of the said adhesive layer of n layers is a reference | standard adhesive layer, The manufacturing apparatus of the sheet | leaf film which controls so that (1) is satisfied.
t / V <1 / ω ₁ (1)
[In the above relation (1), t represents the thickness (μm) of the multilayer film, and ω ₁ is calculated based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. It represents the frequency (1 / sec) at which the modulus of elasticity shows 3.0 × 10 ⁵ (Pa).] The manufacturing apparatus of the sheet | seat film of Claim 7 which makes the reference | standard adhesive layer the adhesive layer whose storage elastic modulus in the temperature of 20 degreeC and an angular frequency of 1,000 radians / sec is minimum in the said adhesive layer. The said multilayer film has a separator film of an outermost surface layer, and the adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of the said separate film,
The manufacturing apparatus of the sheet | seat film which makes the adhesive layer under the said outermost surface layer the said adhesive layer. The said multilayer film is a manufacturing apparatus of the sheet | seat film of Claim 7 which has a polarizer. The said reference adhesive layer is a manufacturing apparatus of the sheet | leaf film of Claim 7 whose thickness is 1-20 micrometers. The said piezoelectric blade is a Thompson blade manufacturing apparatus of any one of Claims 7-11. As a cutting method which cuts the multilayer film which has an adhesive layer of n layer (n is an integer of 1 or more),
A crushing step of cutting the multilayer film by directing the plunger blade from the first surface of the multilayer film to the second surface of the multilayer film to enter the multilayer film,
When the speed V (micrometer / sec) in the 1st surface of the said multilayer film of the said squeezer blade made the adhesive layer in any one of the said adhesive layer of n layers the reference adhesive layer, the following relational formula (1) Satisfactory cutting method of multilayer film.
t / V <1 / ω ₁ (1)
[In the above relation (1), t represents the thickness (μm) of the multilayer film, and ω ₁ is calculated based on the measured value of the dynamic viscoelasticity measurement by frequency sweep at a temperature of 20 ° C. of the reference pressure-sensitive adhesive layer. It represents the frequency (1 / sec) at which the modulus of elasticity shows 3.0 × 10 ⁵ (Pa).] The method for cutting a multilayer film according to claim 13, wherein the pressure-sensitive adhesive layer having a minimum storage modulus at a temperature of 20 ° C. and an angular frequency of 1,000 radians / second in the pressure-sensitive adhesive layer is the reference pressure-sensitive adhesive layer. The said multilayer film has the separator film of an outermost surface layer, and the adhesive layer under the outermost surface layer exposed to the outermost surface by peeling of the said separate film,
The cutting method of the multilayer film which makes the adhesive layer under the said outermost surface layer the said reference adhesive layer. The method of claim 13, wherein the multilayer film has a polarizer. The cutting method of claim 13, wherein the reference pressure-sensitive adhesive layer has a thickness of 1 to 20 μm. 18. The method of any of claims 13 to 17, wherein the piezoelectric blade is a Thompson blade.

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