KR101625250B1 - Film-peeling method, process for production of optical film, film-peeling mechanism, and apparatus for production of optical film - Google Patents

Abstract

Sensitive adhesive sheet in which a light-release film is laminated on one side of a pressure-sensitive adhesive layer and a heavy-release film is laminated on the other side of the pressure-sensitive adhesive layer, As a method for peeling off a film, there is a method of peeling off a peeling film by changing the conveying direction of the light-peeling film and / or the conveying direction of the double-faced pressure-sensitive adhesive sheet without the substrate after peeling, along one or more conveying- Sensitive adhesive sheet is peeled off from the portion of the double-faced pressure-sensitive adhesive sheet which is in contact with the conveying-advancing roll, and the angle? ₁ from the peeling surface of the light-exfoliation film to the peeling surface of the double- A film production method which realizes stable peeling and suppression of electrodeposition when peeling off a light-releasing film from a double-sided pressure-sensitive adhesive sheet without a substrate by the film peeling method The.

Description

TECHNICAL FIELD [0001] The present invention relates to a film peeling method, a method of manufacturing an optical film, a film peeling mechanism, and an optical film production apparatus.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of peeling a substrate-less double-sided pressure-sensitive adhesive sheet, a method of manufacturing an optical film, a film peeling mechanism and an optical film production apparatus. More specifically, when peeling off a light-releasing film from a double-sided pressure-sensitive adhesive sheet having no substrate having a difference in peel strength between a light-release film and a pressure-sensitive adhesive layer, a heavy-release film and a pressure- The present invention relates to a film peeling method capable of suppressing electrodeposition of a pressure-sensitive adhesive to a peeling film and a method of producing an optical film using the film peeling method.

As a major problem of a light-exfoliation film having a peeling force different from that of the pressure-sensitive adhesive layer and a double-sided pressure-sensitive adhesive sheet having no substrate having a heavy-weight film, stable peeling can not be performed at the time of peeling off the light-exfoliating film, And occurrence of electrodeposition of a pressure-sensitive adhesive to the film. A method of increasing the difference between the peeling strength of the heavyweight film and the peeling force of the light-releasing film in order to suppress the electrodeposition has been examined, but the complete electrodeposition inhibition has not been attained.

Further, in Patent Document 1, when an adhesive film is peeled off from an adherend such as a liquid crystal display panel, a part of the adhesive film is pulled off, the peeled portion is sandwiched therebetween, Discloses a pressure-sensitive adhesive film peeling method in which a striped pattern or the like does not occur on the adhered surface. In addition, in Patent Document 2, an optical member is peeled off by aligning the peeling sheet with the peeling sheet, A method of peeling a delamination film from a double-sided pressure-sensitive adhesive sheet without a substrate is not fully discussed in terms of a machine, and a film peeling which realizes stable peeling The method was unknown.

Japanese Patent Application Laid-Open No. 8-292433 Japanese Patent Application Laid-Open No. 2002-40259

The present invention has been made in view of the above problems, and an object of the present invention is to provide a film peeling method which realizes stable peeling and suppression of electrodeposition when peeling off a light-peeling film from a double-sided pressure-

In order to achieve the above object, the inventors of the present invention have conducted intensive studies and, as a result, have found out that the above problems can be solved by peeling a light-exfoliation film at a specific angle so that at least one conveying- .

That is,

1. A film peeling method for peeling a delamination film continuously from a double-sided pressure-sensitive adhesive sheet in which a light-releasing film is laminated on one side of a pressure-sensitive adhesive layer and a heavy-weight film is laminated on the other side, Side adhesive sheet in the conveying direction of the light-scattering film and / or the conveying direction of the double-faced pressure-sensitive adhesive sheet without the substrate after peeling, along with one or more conveying-advancing rolls touching the conveying- A film peeling method wherein the light peeling film is peeled off and the angle? ₁ from the peeling surface of the light peeling film to the peeling face of the double-faced pressure sensitive adhesive sheet having no base after peeling is 28 degrees or more,

2. The double-faced pressure-sensitive adhesive sheet without peeling the double-faced pressure-sensitive adhesive sheet according to claim 1, wherein the conveying direction of the double-faced pressure-sensitive adhesive sheet having no substrate after peeling along the conveying- The angle? ₂ between the extending direction of the carrying direction and the releasing face of the double-faced pressure-sensitive adhesive sheet having no base after peeling is set to be greater than 0 degree and 180 degrees or less,

3. The film peeling method according to claim 2, wherein the above-mentioned θ ₁ and θ ₂ are the same angle,

4. The film-peeling method for a base material according to 1 above, wherein the double-sided pressure-sensitive adhesive sheet without the substrate has a conveying speed of 1 to 50 m /

5. The film-peeling method for a base material according to claim 1, wherein the roll diameter of the conveying-advancing roll is 2 × 10 ² to 6 × 10 ⁴ times the thickness of the pressure-

6. A pressure-sensitive adhesive sheet according to the above 1, wherein the double-sided pressure-sensitive adhesive sheet having no base material and the light-exfoliation film are peeled off, and the optical film is attached to the pressure-sensitive adhesive layer side of the obtained double- A method for producing a layered optical film,

7. A film peeling mechanism for use in the film peeling method of 1 above, comprising: at least one conveying forward roll contacting a double-sided pressure-sensitive adhesive sheet without a substrate; a conveying roll A for conveying the peeled light- A film peeling mechanism having a conveying roll B for conveying the pressure sensitive adhesive sheet and having an angle formed by a plane contacting the conveying forward roll and the conveying roll A and a plane contacting the conveying forward roll and the conveying roll B is 28 degrees or more,

8. A conveying roll C for conveying a double-sided pressure-sensitive adhesive sheet having no base material on a conveying-advancing roll, further comprising a conveying roll C for conveying the conveying roll C and the conveying roll C in such a manner that an angle formed by a plane in contact with the conveying- The film peeling mechanism of the above-mentioned 7, and

9. An optical film production apparatus for use in the production method of an optical film with a pressure-sensitive adhesive layer as described in 6 above, which comprises a fusion mechanism for bonding an optical film to a pressure-sensitive adhesive layer side of a double- An optical film production apparatus having a mechanism is provided.

According to the present invention, stable peeling and inhibition of electrodeposition of a pressure-sensitive adhesive can be realized when the light-releasing film is peeled from a double-sided pressure-sensitive adhesive sheet without a substrate.

1 is a side view showing a state in which a light-releasing film is peeled from a double-sided pressure-sensitive adhesive sheet without a base.
2 (a) is a side view showing a film peeling process in the first embodiment. (b) is a side view showing a film peeling process in the fifth embodiment.
3 shows a film peeling process in which the carrying direction (a) of the delamination film, the carrying direction (b) of the double-sided pressure-sensitive adhesive sheet having no substrate after peeling, and the carrying direction (c) of the double-sided pressure- Side view.
4 is a side view showing an embodiment of the film peeling mechanism of the present invention.
5 is a side view showing an embodiment of an optical film production apparatus of the present invention.

The film peeling method of the present invention is a film peeling method in which a light peeling film is continuously peeled off from a double-sided pressure-sensitive adhesive sheet on which a light-peeling film is laminated on one side of a pressure-sensitive adhesive layer and a heavy- Sided pressure sensitive adhesive sheet without changing the carrying direction of the light-scattering film and / or the carrying direction of the double-sided pressure-sensitive adhesive sheet having no substrate after peeling along the at least one conveying-advancing roll contacting the double- The angle? ₁ from the peeling surface of the light-exfoliating film to the peeling surface of the double-faced pressure-sensitive adhesive sheet having no base after peeling is 28 degrees or more.

Here, the double-sided pressure-sensitive adhesive sheet having no substrate after peeling refers to a double-sided pressure-sensitive adhesive sheet in which the light-releasing film is peeled off by the film peeling method of the present invention, that is,

1 is a side view showing a state in which a light-exfoliation film 3 is peeled off from a double-sided pressure-sensitive adhesive sheet 1 without a substrate in an embodiment of the film peeling method of the present invention. As shown in Fig. 1, a double-sided pressure-sensitive adhesive sheet 1 without a substrate is formed by laminating a light-releasing film 3 on one side of a pressure-sensitive adhesive layer 2 and a heavy- By the peeling, only the delamination film 3 is peeled off from the double-sided pressure-sensitive adhesive sheet 1 without the base material, and the pressure-sensitive adhesive layer 2 and the heavy-leaved film 4 are conveyed while being laminated.

Next, the pressure-sensitive adhesive layer 2 will be described in detail. In the double-sided pressure-sensitive adhesive sheet 1 without a substrate, the pressure-sensitive adhesive layer 2 is formed by laminating a light-releasing film 3 on one side and a heavy-weight film 4 on the other side as shown in Fig. Each of the peeling films can be peeled off and adhered to the adherend. Examples of the pressure sensitive adhesive for use in the pressure sensitive adhesive layer (2) include an acrylic pressure sensitive adhesive, a polyester pressure sensitive adhesive, and a urethane pressure sensitive adhesive. For example, when the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive, a main monomer component that imparts adhesiveness, a comonomer component that imparts adhesiveness or cohesive force, a polymer mainly comprising a crosslinking point or a functional group- And may be composed of a copolymer. Examples of the main monomer component include acrylic acid alkyl esters such as ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate and methoxyethyl methacrylate, Methacrylic acid alkyl esters such as 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and benzyl methacrylate. Examples of the comonomer component include methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene, and acrylonitrile. Examples of the functional group-containing monomer component include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, maleic acid and itaconic acid, and monomers containing carboxyl groups such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, , Hydroxyl group-containing monomers such as 2-hydroxypropyl methacrylate and N-methylol acrylamide, acrylamide, methacrylamide, glycidyl methacrylate, N-vinylmorpholine, N- And N- (meth) acryloylmorpholine. By including these components, the adhesive force and the cohesive force of the pressure-sensitive adhesive layer are improved.

Further, since such an acrylic resin usually has no unsaturated bond in the molecule, the stability against light or oxygen can be improved. In addition, by appropriately selecting the kinds and molecular weights of the monomers, a pressure-sensitive adhesive composition having quality and characteristics according to use can be obtained. Such a pressure-sensitive adhesive composition may be either a crosslinked type subjected to a crosslinking treatment or a non-crosslinked type not subjected to a crosslinking treatment.

The pressure-sensitive adhesive composition used in the present invention may contain various additives such as antioxidants, plasticizers, tackifiers, and stabilizers, if necessary. The average thickness of the pressure-sensitive adhesive layer (2) is not particularly limited, but is preferably 5 to 200 占 퐉, more preferably 10 to 100 占 퐉.

The modulus of elasticity of the pressure-sensitive adhesive that can be used is usually about 1 × 10 ^{5 to} 1 × 10 ⁷ Pa, preferably 1 × 10 ⁵ to 10 ⁶ Pa.

The double-sided pressure-sensitive adhesive sheet 1 without a substrate has a light-peeling film 3 to be peeled off first and a heavy-chipped film 4 to be peeled off after attaching the pressure-sensitive adhesive layer 2 to an adherend, The peeling force of the pressure sensitive adhesive layer 2 on the pressure sensitive adhesive layer 2 is set to be smaller than the peeling force of the pressure sensitive adhesive layer 2 of the heavy transport film 4 by appropriately setting a releasing agent layer. The peeling force of the light-releasing film 3 with respect to the pressure-sensitive adhesive layer 2 is preferably 1 to 150 mN / 25 mm, more preferably 10 to 100 mN / 25 mm. On the other hand, the peeling strength of the heavy-duty rolled film 4 with respect to the pressure-sensitive adhesive layer 2 is preferably 50 to 200 mN / 25 mm, more preferably 70 to 150 mN / 25 mm. If the peeling force of the medium peeling film 4 is 1.2 times or more, preferably 1.4 times or more than the peeling force of the light peeling film 3, the peeling force of the pressure sensitive adhesive It is difficult to electrodeposit on the light-releasing film side.

Specific examples of the light-releasing film 3 and the heavy-weight releasing film 4 include those having a structure in which a release agent layer is formed on a release sheet base. The material of the release sheet base material is not particularly limited, and examples thereof include a polyester film such as a polyethylene terephthalate film and a polybutylene terephthalate film, a polyolefin film such as a polypropylene film and a polymethylpentene film, a polycarbonate film Plastic film, metal foil such as aluminum and stainless steel, paper such as grainy paper, coated paper, coated paper, impregnated paper, and synthetic paper. When a plastic film is used as the release sheet substrate, a physical or chemical surface such as an oxidation method or an unevenness method may be provided on the side of the plastic film on which the release agent layer is provided, for the purpose of improving the adhesion between the plastic film and the release agent layer, Processing can be performed. Examples of the oxidation method include a corona discharge treatment, a chromic acid treatment, a flame treatment, a hot air treatment, an ozone / ultraviolet ray irradiation treatment and the like. Examples of the surface irregularity method include a sandblast method and a solvent treatment method . These surface treatment methods are appropriately selected depending on the kind of the release sheet substrate, but generally, the corona discharge treatment method is preferably used in terms of effect and operability. The primer treatment may also be carried out.

The average thickness of the light-releasing film 3 and the heavy-weight releasing film 4 is not particularly limited, but is preferably 10 to 200 占 퐉, more preferably 15 to 100 占 퐉.

In the film peeling method of the present invention, as shown in Fig. 2 (a), along the conveying-forwarding roll 5 contacting the side of the heavy-weight film 4 of the double-sided pressure-sensitive adhesive sheet 1 without the substrate, The conveying direction of the double-faced pressure-sensitive adhesive sheet 6 may be changed to the direction of the heavy-backed film, or the conveying direction of the conveying- The conveying direction of the light-releasing film 3 may be changed to the opposite direction of the pressure-sensitive adhesive layer along the conveying direction 5, or two or more conveying rollers 5 as shown in Fig. 3 may be used, The transport direction of both the sheet 6 and the light-exfoliation film 3 may be changed. By providing this conveying roll, the peeling position, the peeling angle, and the peeling speed of the double-sided pressure-sensitive adhesive sheet having no substrate can be made constant.

In the film peeling method of the present invention, the angle? ₁ from the peeling surface of the light-peeling film 3 to the peeling surface of the double-faced pressure-sensitive adhesive sheet 6 having no base after peeling is 28 degrees or more, preferably 28 To 95 degrees, and more preferably from 28 to 75 degrees. If the angle? ₁ is set to less than 28 degrees, the transporting roll 5 passes the delamination film 3 from the double-sided pressure-sensitive adhesive sheet 1 without the substrate in a peeled manner, The peeling position is not constant because of peeling. As a result, the peeling angle and the peeling speed are not constant. Therefore, the peeling angle and the peeling speed are not constant, so that the peeling angle can not be stably peeled off at the portion contacting with the conveying-advancing roll 5 and a part of the surface of the pressure- The stretching phenomenon tends to occur like a drawn yarn, and the pressure sensitive adhesive is returned to the side of the heavy-duty rewind film 4, so that roughness tends to occur on the surface of the pressure-sensitive adhesive after exfoliation. When the angle? ₁ is more than 95 degrees, the pressure-sensitive adhesive is largely expanded at the time of peeling, so that roughness of the surface tends to occur over the entire surface of the pressure-sensitive adhesive layer depending on the kind of the pressure-sensitive adhesive.

The angle (θ ₁₎ is more specifically light separation film 3 after peeling as seen in the vertical direction (TD) of the pressure sensitive adhesive double coated sheet 1 without the base peeling mechanism is to pass the return deflector roll 5 From the peeling side of the straight portion until the next contact with the conveying roll, until the peeling side of the straight portion from the base material-free double-faced pressure-sensitive adhesive sheet 6 until passing through the conveying- Angle.

In the film peeling method of the present invention, the double-sided pressure-sensitive adhesive sheet (1) having no base material is peeled off from the double-sided pressure-sensitive adhesive sheet (6) Side adhesive sheet 6 having no base material after peeling from the extending direction of the carrying direction c of the double-sided pressure-sensitive adhesive sheet 1 without the base material before peeling is changed to the conveying- preferably the peeling surface angle (θ ₂₎ that make up 0 to exceed and, more preferably to more than 28 degrees, it is particularly preferred that it is more preferable to 28-90 degrees and 28-75 degrees. It is more preferable that the angle θ ₂ is θ ₁ -10 ° to θ ₁ + 10 °, more preferably θ ₁ -5 ° to θ ₁ + 5 °, and the angle θ ₂ is the same as θ ₁ , that is, It is most preferable that the conveying direction is changed only in the double-faced pressure-sensitive adhesive sheet without the peeling film, and the conveying direction is not changed in the lightly peeling film conveying direction after peeling. The pressure sensitive adhesive layer 2 is stretched and deformed at the time of peeling so that a greater shearing force acts on the interface between the light releasing film 3 and the pressure sensitive adhesive layer 2 to be easily peeled off, ). ≪ / RTI > Further, the angle? ₂ is always an angle of 180 degrees or less.

More specifically, when viewed from the perpendicular direction (TD) of the double-sided pressure-sensitive adhesive sheet 1 without a base material, the angle? ₂ is more specifically defined as the angle? ₂ in the extending direction of the double- Side adhesive sheet 6 having no substrate after peeling from the conveying forward roll 5 to the peeling side of the straight line portion until the double-faced pressure-sensitive adhesive sheet 6 without peeling has passed through the conveying-

It is preferable that the diameter of the conveying-advancing roll 5 is small in order to stably peel the pressure-sensitive adhesive layer 2 and the heavy-weight rewinding film 4. The pressure-sensitive adhesive of the double-sided pressure-sensitive adhesive tape having no base material is stretched from the release films on both sides at the start of peeling, and the pressure-sensitive adhesive finally remains on the side of the heavy- The larger the diameter of the conveying-forward roll 5, the longer the time for which the pressure-sensitive adhesive is stretched, and the deformation of the pressure-sensitive adhesive is likely to remain. However, if the diameter of the conveying deflection roll 5 is too small, in the case of the double-sided pressure-sensitive adhesive sheet 1 having no base material using a highly rigid release film such as a thick film, There is a possibility. Specifically, the diameter of the conveying-advancing roll 5 is usually about 2 × 10 ² to 6 × 10 ⁴ times the thickness of the pressure-sensitive adhesive layer 2, and is preferably 1 × 10 ^{3 to} 1 × 10 ⁴ times. With regard to the peeling speed, when? ₁ and? ₂ satisfy? ₁ =? ₂ , it is 1 to 60 m / min, preferably 1 to 30 m / min, more preferably 1 to 20 m / min. Further, θ ₁ and θ ₂ is θ ₂ ≤θ ₁ ≤θ ₂ if satisfying the +50 degree if 1~10m / min, θ ₂ + 50 also satisfies the ≤θ ₁ is preferably 1~20m / minute .

The present invention also relates to a pressure-sensitive adhesive sheet with a pressure-sensitive adhesive layer attached thereto on the pressure-sensitive adhesive layer side of a double-sided pressure-sensitive adhesive sheet having no substrate after peeling obtained by peeling off a light-releasing film from a double- A method for producing an optical film is also provided. Specific examples of the optical film include a polarizing plate and a retardation plate.

The polarizing plate is generally composed of a polarizing film having a three-layer structure in which an optically isotropic film such as a triacetyl cellulose (TAC) film is adhered on both sides of a polyvinyl alcohol polarizer, and a liquid crystal cell A pressure-sensitive adhesive layer is provided for the purpose of attaching to an optical component. The method for producing an optical film with a pressure-sensitive adhesive layer of the present invention is suitably used as a method for providing the pressure-sensitive adhesive layer.

Further, in order to improve the viewing angle characteristics, a retarder may be disposed between the polarizing plate and the liquid crystal cell through an adhesive. The method for producing an optical film with a pressure-sensitive adhesive layer of the present invention is suitably used as a method of providing the pressure-sensitive adhesive layer used herein.

Next, the present invention is a film peeling mechanism used in the film peeling method as shown in Fig. 4, which comprises at least one conveying forward roll 5 touching a double-sided pressure-sensitive adhesive sheet 1 without a substrate and a light- Side adhesive sheet having no substrate after peeling, and has a planar surface contacting the conveying forward roll 5 and the conveying roll A (7), and a conveying roll A (7) conveying the double- And a plane which is in contact with the forward roll 5 and the transport roll B 8 is 28 degrees or more.

The film peeling mechanism also has a conveying roll C (9) for conveying the double-sided pressure-sensitive adhesive sheet 1 having no base material to the conveying-forwarding roll 5, It is preferable that the angle formed by the plane and the plane in contact with the conveying roll 5 and the conveying roll B 8 is more than 0 degree and more preferably 28 degrees or more.

The conveying advance rolls and conveying rolls A to C are not particularly limited as long as they can carry a double-sided pressure-sensitive adhesive sheet without a substrate before peeling, a light-releasing film and a double-sided pressure-sensitive adhesive sheet without a substrate after peeling, A resin-coated roll or the like may be used.

As shown in Fig. 5, the present invention also relates to an optical film production apparatus for use in the method for producing an optical film with a pressure-sensitive adhesive layer as described above, wherein the adhesive for the optical film (14) An optical film production apparatus (12) having a mechanism (10) and the film peeling mechanism (11) is also provided.

It is preferable that the optical film production apparatus further includes a surface activation processing mechanism (13). The surface activation processing mechanism 13 may be any processing mechanism capable of performing physical or chemical surface treatment such as the oxidation method and the unevenness method described above. For example, a corona discharge treatment mechanism, chromic acid treatment mechanism, flame treatment mechanism, , An ozone / ultraviolet ray irradiation treatment apparatus, a sandblast treatment apparatus, and a solvent treatment apparatus. Among them, a corona discharge treatment mechanism is most preferable from the viewpoints of effectiveness and operability.

Example

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited by these examples at all.

<Evaluation method>

(Electrodeposition)

Sensitive adhesive sheet 10m having no base material was peeled off at a conveying speed of 1, 3, 5, 10, 30 or 50 m / min, visually confirming whether or not the pressure-sensitive adhesive on the side of the separable film was electrodeposited, "

○: No electrodeposition

X: Electrodeposition occurred, or the peeling position was changed, and the roughness due to the pulling on the pressure-sensitive adhesive surface was visually confirmed.

(Peel stability)

During the peeling operation at the conveying speeds of 1, 3, 5, 10, 30, and 50 m / min, occurrence of flaps and wrinkles was visually confirmed and the following evaluation criteria were used.

○: No occurrence of flicker or wrinkles

?: Flutter somewhat, but not wrinkles

X: Flame is confirmed and wrinkles are generated

(Method of measuring peel force)

The peeling ability of the light-peeling film was measured by peeling off the light-peeling film at a peeling angle of 180 degrees and at a speed of 10 m / min. The adhesive side of the double-sided pressure-sensitive adhesive sheet having no base material after peeling off the light-releasing film was fixed to the overlying plate through a polyester film, and the heavy-weight film was peeled off at a peeling angle of 180 degrees and at a velocity of 10 m / The peel strength was measured.

Example 1.

A light-releasing film obtained by applying a polydimethylsiloxane-based releasing agent to a polyethylene terephthalate (PET) film having a thickness of 38 mu m and a monomer composition ratio of butyl acrylate (BA): methyl acrylate (MA) = 75: 25 As a cross-linking agent, 1.5 parts by weight of BHS8515 (trade name) as a cross-linking agent (all in solid conversion)) and the same polydimethylsiloxane-based releasing agent A double-sided pressure-sensitive adhesive sheet having no substrate made by peeling force difference was produced by laminating a heavy-weight film produced by adding a heavy-duty additive made of silicone resin. (Roll diameter 50 mm, about 3300 times the thickness of the pressure-sensitive adhesive layer) of the double-sided pressure-sensitive adhesive sheet without the base material, the conveying direction of the pressure-sensitive adhesive layer and the heavy- Side adhesive sheet having no substrate after peeling from the peeling side of the light-peeling film, and an angle (? ₁ ) from the peeling side of the double-side adhesive sheet without peeling to the peeling side of the double- Side pressure-sensitive adhesive sheet and the conveying-advancing roll at the conveying speeds shown in Tables 1 and 2 so that the angle? ₂ between the conveying direction and the extending direction of the conveying direction (See Fig. 2 (a)). The peeling force of the light-releasing film was 90 mN / 25 mm, and the peeling strength of the heavy-weight peeling film was 150 mN / 25 mm.

Example 2

The same procedure as in Example 1 was carried out except that the diameter of the transfer roll was changed to 150 mm.

Example 3

In the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate before the peeling from the peeling surface of the light separation film foil pressure sensitive adhesive double coated sheet is not an angle (θ ₁₎ and the base material after peeling to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the front and rear surfaces of And the angle (? ₂ ) formed by the extension to the extending direction was 70 degrees.

Example 4

In the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate before the peeling from the peeling surface of the light separation film foil pressure sensitive adhesive double coated sheet is not an angle (θ ₁₎ and the base material after peeling to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the front and rear surfaces of And the angle (? ₂ ) formed by the extension to the extending direction was 90 degrees.

Example 5

The direction of conveyance of the specularly-stretched film was changed to the side of the conveying-advancing roll along the conveying-advancing roll so that the conveying-advancing roll contacted with the light-releasing film side of the double-faced pressure-sensitive adhesive sheet without the substrate, Was carried out in the same manner as in Example 1 (see Fig. 2 (b)) except that the sheet was transported so that the angle? ₁ from the sheet to the release surface was 30 degrees.

Example 6

The procedure of Example 5 was repeated except that the angle? ₁ from the peeling surface of the light-peeling film to the peeling surface of the double-faced pressure-sensitive adhesive sheet having no substrate after peeling was 90 degrees.

And the electrodeposition and peeling stability by peeling of the film were evaluated. The results are shown in Tables 1 and 2.

Comparative Example 1

In the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate before the peeling from the peeling surface of the light separation film foil pressure sensitive adhesive double coated sheet is not an angle (θ ₁₎ and the base material after peeling to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the front and rear surfaces of And the angle (? ₂ ) formed by the extension to the extending direction was 20 degrees.

The electrodeposition and peeling stability by peeling of the films in Examples 1 to 6 and Comparative Example 1 were evaluated. The results are shown in Tables 1 and 2.

[Table 1]

[Table 2]

Industrial availability

INDUSTRIAL APPLICABILITY The film peeling method and the optical film production method of the present invention are very suitable for a method of efficiently sticking an optical film because it can suppress the electrodeposition of a pressure-sensitive adhesive to a light-releasing film and realize stable peeling.

1: Double-sided pressure-sensitive adhesive sheet without substrate
2: Pressure-sensitive adhesive layer
3: Light-releasing film
4: heavyweight film
5: Conveying feed roll
6: Double-sided pressure-sensitive adhesive sheet without substrate after peeling
7: Return roll A
8: conveying roll B
9: conveying roll C
10:
11: Film peeling mechanism
12: Optical film production apparatus
13: Surface activation processing device
14: Optical film
a: the direction of transport of the delamination film
b: conveying direction of the double-faced pressure-sensitive adhesive sheet without substrate after peeling
c: the direction of conveyance of the double-sided pressure-sensitive adhesive sheet without the substrate before peeling
d: extension direction of the double-faced pressure-sensitive adhesive sheet without substrate before peeling in the carrying direction
&amp;thetas; ₁ : angle from the peeling surface of the light-peeling film to the peeling surface of the double-faced pressure-sensitive adhesive sheet without peeling
? ₂ : an angle formed by the direction of extension of the double-sided pressure-sensitive adhesive sheet having no base material before peeling in the conveying direction to the peeling surface of the double-faced pressure-

Claims (9)

Sensitive adhesive sheet in which a light-release film is laminated on one side of a pressure-sensitive adhesive layer and a heavy-release film is laminated on the other side of the pressure-sensitive adhesive layer, A method for peeling off a film, comprising the steps of: changing at least one of a conveying direction of a light-peeling film and a conveying direction of a double-faced pressure-sensitive adhesive sheet having no substrate after peeling along one or more conveying- The angle? ₁ from the peeling surface of the light-exfoliating film to the peeling surface of the double-faced pressure-sensitive adhesive sheet having no substrate after peeling off from the peeling surface of the double-sided pressure- Sided pressure-sensitive adhesive sheet having a thickness of 28 degrees or more and a double-sided pressure-sensitive adhesive sheet having no base material after peeling along a conveying- The jungbak Li film changes toward the conveying forward roll touches the side, and the peeling surface angle (θ ₂₎ that make up the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the direction of extension of the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate prior to separation &amp;thetas; ₁ +/- 10. The method according to claim 1,
And the above-mentioned? ₂ is set at 28 degrees or more and 90 degrees or less. The method according to claim 1,
Wherein the angle? ₁ and the angle? ₂ are the same angle. The method according to claim 1,
Wherein the conveying forward roll contacting one side of the double-sided pressure-sensitive adhesive sheet without the base material is one side. The method according to claim 1,
Wherein the double-sided pressure-sensitive adhesive sheet without the substrate has a conveying speed of 1 to 50 m / min. The method according to claim 1,
Wherein the roll diameter of the conveying forward roll is 2 x 10 ² to 6 x 10 ⁴ times the film thickness of the pressure-sensitive adhesive layer. Sensitive adhesive layer is peeled off from a double-faced pressure-sensitive adhesive sheet without a substrate by the film peeling method according to claim 1, and the optical film is attached to the pressure-sensitive adhesive layer side of the obtained double-sided pressure- Gt; A film peeling mechanism for use in the film peeling method according to claim 1, comprising: at least one conveying forward roll contacted with a double-faced pressure-sensitive adhesive sheet without a substrate; a conveying roll A for conveying the peeled light- A conveying roll B for conveying a sheet and a conveying roll C for conveying a double-faced pressure-sensitive adhesive sheet without a substrate to a conveying forward roll, and has a flat surface in contact with the conveying forward roll and the conveying roll A, The angle formed between the plane in contact with the conveying advance roll and the conveying roll C and the plane in contact with the conveying advancing roll and the conveying roll B is larger than the angle between the plane in contact with the conveying advancing roll and the conveying roll A, And an angle formed by a plane contacting the transport roll B is within ± 10 degrees. There is provided an apparatus for producing an optical film with a pressure-sensitive adhesive layer according to the seventh aspect of the present invention, which comprises a bonding mechanism for bonding an optical film to a pressure-sensitive adhesive layer side of a double- Gt;

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