WO2017146042A1

WO2017146042A1 - Manufacturing method for laminated optical film

Info

Publication number: WO2017146042A1
Application number: PCT/JP2017/006356
Authority: WO
Inventors: 俊之仲; 武志川上; 卓也安藤
Original assignee: 住友化学株式会社
Priority date: 2016-02-25
Filing date: 2017-02-21
Publication date: 2017-08-31
Also published as: CN108700695A; JP6175527B1; KR102693081B1; KR20180116315A; TW201736111A; JP2017149052A; TWI704058B; CN108700695B

Abstract

Provided is a manufacturing method for a laminated optical film, capable of manufacturing a laminated optical film in which when some layers are peeled off from the laminated optical film provided with an optical film having a plurality of layers capable of being peeled off from each other, other layers are less prone to splitting. The manufacturing method for a laminated optical film in which a first optical film 2 having a plurality of layers capable of being peeled off from each other, an adhesive layer 5, and a second optical film 3 are introduced between a pair of rotating bonding rollers 7a, 7b and the first optical film 2 and the second optical film 3 are bonded, wherein: when bonding, the width W_A of the adhesive layer 5 is at least the width W₁ of the first optical film 2; the position in the width direction of the first optical film 2 is within the existence width W_A of the adhesive layer 5; the width W₂ of the second optical film 2 is at least the width W_A of the adhesive layer 5; and the second optical film 2 is positioned so as to contain the existence width W_A of the adhesive layer 5.

Description

Method for producing laminated optical film

The present invention relates to a method for producing a laminated optical film.

Conventionally, a method for producing a laminated optical film in which a plurality of optical films are pressure-bonded by passing between a pair of bonding rolls via an adhesive layer or a pressure-sensitive adhesive layer is known (see, for example, Patent Document 1). ). The adhesive layer or the pressure-sensitive adhesive layer is usually supplied by applying an adhesive or a pressure-sensitive adhesive to any one of the laminated optical films.

On the other hand, a polarizing plate produced by laminating another optical film via an adhesive layer or an adhesive layer on an optical film including a plurality of layers that can be peeled from each other, for example, a resin base material and a polarizer, is known. (For example, refer to Patent Document 2).

JP 2014-172290 A JP 2014-44355 A

For example, when the resin substrate is peeled off in the polarizing plate, the polarizer facing the adhesive layer or the pressure-sensitive adhesive layer tends to tear.

The present invention provides a laminated optical film capable of producing a laminated optical film in which, when a part of layers is peeled from a laminated optical film comprising an optical film having a plurality of layers that can be peeled from each other, other layers are difficult to tear. An object is to provide a manufacturing method.

The present invention provides a first optical film having a plurality of layers peelable from each other between a pair of rotating bonding rolls, an adhesive layer or a pressure-sensitive adhesive layer, and a second optical film. It is the manufacturing method of a laminated optical film which introduce | transduces in the state arranged in this order in the direction which ties between bonding rolls, and bonds the 1st optical film and the 2nd optical film, Comprising: At the time of bonding, it adhere | attaches The width of the agent layer or the pressure-sensitive adhesive layer is equal to or greater than the width of the first optical film, and the first optical film has a position in the width direction within the existing width of the adhesive layer or the pressure-sensitive adhesive layer. The width of the optical film is equal to or greater than the width of the adhesive layer or the pressure-sensitive adhesive layer, and the second optical film is positioned so as to include the existing width of the adhesive layer or the pressure-sensitive adhesive layer. A manufacturing method is provided.

In this manufacturing method, the width of the adhesive layer or the pressure-sensitive adhesive layer is equal to or larger than the width of the first optical film having a plurality of layers that can be peeled from each other, and the first optical film is bonded at a position in the width direction. It is within the existing width of the agent layer or the pressure-sensitive adhesive layer. For this reason, when it is going to peel a part layer from the 1st optical film in the manufactured laminated optical film, the layer which remains on the laminated optical film side is fully held by the adhesive layer or the pressure-sensitive adhesive layer. Become. Therefore, according to this manufacturing method, when a part of the layers is peeled from the laminated optical film including the optical film having a plurality of layers that can be peeled from each other, it is possible to produce a laminated optical film in which other layers are difficult to tear. .

In this manufacturing method, the width of the bonding roll on the first optical film side is equal to or larger than the width of the first optical film, and the position of the first optical film in the width direction is the bonding on the first optical film side. The aspect which exists in the existing width of a combined roll may be sufficient. In this case, since the 1st optical film is pressed with the bonding roll over the whole area of the width direction, the adhesiveness or adhesiveness of a 1st optical film and a 2nd optical film increases.

In this production method, a third optical film having a width larger than the width of the adhesive layer or the pressure-sensitive adhesive layer is bonded between the first optical film-side bonding roll and the first optical film. The aspect which interposes so that the width | variety of a layer or an adhesive layer may be included may be sufficient. In the conventional manufacturing method, the adhesive or the pressure-sensitive adhesive protrudes from the end portion in the width direction of the first optical film and adheres to the bonding roll at the time of bonding. By interposing the optical film of 3, it can prevent that an adhesive agent or an adhesive adheres to the said bonding roll.

In this manufacturing method, the first optical film has a resin base material and an optical functional layer provided on one or both surfaces of the resin base material, and the resin base material and the optical functional layer are equal in width to each other and aligned at both ends. The first optical film may be arranged such that the optical functional layer side faces the adhesive layer or the pressure-sensitive adhesive layer side, and the second optical film may be a protective film. In this case, since the resin base material and the optical functional layer have the same width and both ends are aligned, the film thickness of the end portion in the width direction as the first optical film is stable.

In this manufacturing method, the optical functional layer may be a polarizer. At this time, the polarizer may be provided by being applied to a resin base material.

In another aspect, the present invention, in another embodiment, between a pair of rotating bonding rolls, an optical functional layer provided on one or both sides of the resin substrate, an adhesive layer or an adhesive layer, A method for producing a laminated optical film, in which a protective film is introduced in a state in which the protective film is arranged in this order in a direction connecting a pair of bonding rolls, and the optical functional layer and the protective film are bonded, and at the time of bonding The width of the optical functional layer is smaller than the width of the resin base material, and the width of the adhesive layer or the pressure-sensitive adhesive layer is equal to or larger than the width of the optical functional layer and smaller than the width of the resin base material. The layer is positioned so that the position in the width direction is within the existing width of the adhesive layer or the pressure-sensitive adhesive layer, and the resin substrate is positioned so as to include the existing width of the optical function layer and the adhesive layer or the pressure-sensitive adhesive layer. The width of the protective film is equal to or greater than the width of the adhesive layer or the pressure-sensitive adhesive layer, Adhesive layer is positioned in the width direction is within the existence range of the protective film, to provide a method of manufacturing a laminated optical film.

In this manufacturing method, the width of the adhesive layer or the pressure-sensitive adhesive layer is equal to or larger than the width of the optical function layer, and the position of the optical function layer in the width direction is within the existing width of the adhesive layer or the pressure-sensitive adhesive layer. For this reason, when it is going to peel a resin base material or an optical function layer in the manufactured laminated optical film, the layer which remains on the laminated optical film side will fully be hold | maintained by the adhesive bond layer or an adhesive layer.
Therefore, according to this manufacturing method, when a part of the layer is peeled from the laminated optical film including the optical film having the resin base material and the optical functional layer, it is possible to produce a laminated optical film in which other layers are difficult to tear. . Moreover, in this manufacturing method, the width of the optical functional layer is smaller than the width of the resin base material, and the resin base material is positioned so as to include the existing width of the optical functional layer and the adhesive layer or the pressure-sensitive adhesive layer. Therefore, it can prevent that an adhesive agent or an adhesive adheres to the bonding roll by the side of a resin base material.

In this manufacturing method, the width of the bonding roll on the resin substrate side is equal to or larger than the width of the optical functional layer, and the optical functional layer has a position in the width direction within the existing width of the bonding roll on the resin substrate side. The aspect which exists in may be sufficient. In this case, since the optical functional layer is pressed by the bonding roll over the entire region in the width direction, the adhesiveness or tackiness between the optical functional layer or the resin substrate and the protective film is increased.

According to the present invention, it is possible to manufacture a laminated optical film in which, when a part of layers is peeled from a laminated optical film including an optical film having a plurality of layers that can be peeled from each other, other layers are difficult to tear. A method for producing a film can be provided.

It is sectional drawing of the laminated optical film manufactured with the manufacturing method of 1st Embodiment. It is a figure which shows the manufacturing method of 1st Embodiment. It is the III-III sectional view of Drawing 2, and is a figure showing the lamination state at the time of pasting of a 1st embodiment. It is sectional drawing of the laminated optical film manufactured with the manufacturing method of 2nd Embodiment. It is a figure which shows the manufacturing method of 2nd Embodiment. It is VI-VI sectional drawing of FIG. 5, Comprising: It is a figure which shows the lamination | stacking state at the time of bonding of 2nd Embodiment. It is sectional drawing of the laminated optical film manufactured with the manufacturing method of 3rd Embodiment. It is a figure which shows the lamination | stacking state at the time of bonding of 3rd Embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted. The dimensional ratios in the drawings do not necessarily match the actual ones, and in particular, the thickness and width of the film are exaggerated.

<First Embodiment>
(Laminated optical film)
As shown in FIG. 1, in the laminated optical film 1 </ b> A manufactured by the method for manufacturing a laminated optical film according to the first embodiment, the second optical film 3 is bonded to one surface of the first optical film 2. It is laminated via the agent layer 5. The first optical film 2 has two layers, that is, a resin base material 21 and a polarizer 22 provided on one surface thereof, which can be separated from each other.

In the first optical film 2, the resin base material 21 and the polarizer 22 have the same width and are aligned at both ends, and the first optical film 2 is disposed so that the polarizer 22 side faces the adhesive layer 5 side. Has been. In the present specification, the “width” of each optical film refers to the width in the extending direction of the bonding roll, which is a direction perpendicular to the transport direction of each optical film during the production of the laminated optical film 1A. In addition, the expression “large” and “small” is used for the relative magnitude relationship (broad and narrow relationship) of the width of each film.

The laminated optical film 1 </ b> A is used as the polarizing plate 10 from which the resin base material 21 is removed and provided with a polarizer 22 and a second optical film (= protective film described later) 3. In the polarizing plate 10, a protective film or other optical film may be newly provided via an adhesive layer or a pressure-sensitive adhesive layer on the resin substrate 21 side or the second optical film side 3 that has been peeled off as necessary. .

The first optical film 2, the second optical film 3, and the adhesive layer 5 are as described later in relation to the magnitude and positional relationship of the widths, and these layers have a substantially central axis in each width direction. It's all there. That is, in the cross-sectional view shown in FIG.

Here, the configuration of each film and the adhesive layer will be described. As the material of the polarizer 22, known materials conventionally used in the production of polarizing plates can be used. For example, polyvinyl alcohol resin, polyvinyl acetate resin, ethylene / vinyl acetate (EVA) resin, polyamide Examples thereof include resins and polyester resins. Of these, polyvinyl alcohol resins are preferred. After these materials are stretched, a film-like polarizer 22 can be obtained by dyeing with iodine or a dichroic dye and boric acid treatment. A laminate that is bonded to one or both surfaces of the resin base material 21 via an adhesive may be used as the first optical film 2.

Moreover, as a formation method of the polarizer 22, after apply | coating the coating liquid which melt | dissolved the material of the polarizer 22 to the single side | surface or both surfaces of the resin base material 21 in a thin film form (film shape), and drying, it is the whole resin base material 21 The film may be stretched, dyed with iodine or a dichroic dye, and treated with boric acid. Then, it can cut out to the arbitrary magnitude | size with the resin base material 21, and can be set as the 1st optical film 2. FIG.

Examples of the stretching method include longitudinal stretching in the film longitudinal direction (film transport direction), lateral stretching in the film width direction, and oblique stretching. Examples of the longitudinal stretching method include inter-roll stretching and compression stretching, and examples of the lateral stretching method include a tenter method. As the stretching treatment, either a wet stretching method or a dry stretching method can be adopted. However, it is preferable to use a dry stretching method because the stretching temperature can be selected from a wide range.

The thickness of the polarizer 22 is preferably 2 to 75 μm, more preferably 2 to 50 μm, still more preferably 2 to 30 μm.

The resin base material 21 has a role as a support for coating the polarizer 22 in a thin film (film shape) and a role of protecting the surface of the polarizer 22, and uses various resin materials. be able to. Examples of the material of the resin base material 21 include polyethylene terephthalate (PET) resin, polypropylene resin, and polycarbonate resin.

The thickness of the resin base material 21 is preferably 20 to 500 μm, more preferably 30 to 300 μm, still more preferably 50 to 200 μm.

The second optical film 3 is a protective film 3 here.

The protective film 3 is a film that prevents the main surface and edges of the polarizer 22 from cracking and scratching. Here, the “protective film” refers to a film directly laminated via an adhesive among the films that can be variously laminated on the polarizer 22.

The protective film 3 can be composed of various transparent resin films known in the field of polarizing plates. For example, cellulose resin whose typical example is triacetyl cellulose, polyolefin resin whose typical example is polypropylene resin, cyclic olefin resin whose typical example is norbornene resin, acrylic whose typical example is polymethyl methacrylate resin Examples thereof include polyester resins and polyester resins having polyethylene terephthalate resins as representative examples. Among these, cellulose resin is representative.

The protective film 3 may be a film having no optical function, or may be a film having an optical function such as a retardation film or a brightness enhancement film.

The thickness of the protective film 3 is preferably 5 to 90 μm, more preferably 5 to 80 μm, and still more preferably 5 to 50 μm.

As the adhesive forming the adhesive layer 5, various adhesives conventionally used in the production of polarizing plates can be used. For example, an epoxy resin that does not contain an aromatic ring in the molecule is preferable from the viewpoint of weather resistance, refractive index, cationic polymerizability, and the like. Moreover, what hardens | cures by irradiation of an active energy ray (an ultraviolet ray or a heat ray) is preferable.

As the epoxy resin, for example, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin and the like are preferable. For epoxy resins, polymerization initiators (for example, photocationic polymerization initiators for polymerization by UV irradiation, thermal cationic polymerization initiators for polymerization by heat ray irradiation), and other additives (sensitizers, etc.) Can be added to prepare an epoxy resin composition for coating.

Also, as the adhesive, acrylic resins such as acrylamide, acrylate, urethane acrylate, and epoxy acrylate, and polyvinyl alcohol-based aqueous adhesives can be used.

The polarizing plate 10 is attached to one side or both sides of a display cell (image display element) such as a liquid crystal cell. The polarizing plate can further include another optical layer laminated on the protective film. As another optical layer, a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light having the opposite properties; a film with an antiglare function having an uneven surface; a film with a surface antireflection function; surface A reflective film having a reflective function; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.

The thickness of the polarizing plate 10 comprising two layers of the polarizer 22 and the protective film 3 is preferably 10 to 500 μm, more preferably 10 to 300 μm, and still more preferably 10 to 200 μm.

(Manufacturing method of laminated optical film)
As a manufacturing method of laminated optical film 1A, as shown in FIG. 2 and FIG. 3, between a pair of rotating bonding rolls 7a and 7b, the first optical film 2, the adhesive layer 5, The protective film 3 is introduced in a state in which the protective film 3 is arranged in this order in the direction connecting the pair of bonding rolls 7 a and 7 b, and the first optical film 2 and the protective film 3 are bonded together.

Here, the polarizer 22 in the first optical film 2 is applied to the resin base material 21 and dried, and then stretched together with the resin base material 21, followed by dyeing with iodine or a dichroic dye and boric acid treatment. After water washing and drying, the width direction end portion is cut out, the widths of the resin base material 21 and the polarizer 22 are equal and supplied by aligning both ends, and the adhesive layer 5 is applied to the protective film 3. Supply with. In addition, illustration of the adhesive bond layer 5 is abbreviate | omitted in FIG.

The first optical film 2 and the protective film 3 are laminated to form a laminated body 4A, and the laminated body 4A is then completed as the laminated optical film 1A shown in FIG. 1 by curing the adhesive layer 5.

Existence mode of each member at the time of pasting is explained. As FIG. 3 shows, the width | variety of each film and the adhesive bond layer 5 between a pair of bonding rolls 7a and 7b satisfy | fills the following relationships. In FIG. 3, the bonding rolls 7a and 7b are drawn away from the laminated body 4A in order to make the drawing easy to see.
At the time of pasting,
, Width W _A of the adhesive layer 5 is the first optical film 2 having a width W ₁ or more. (W _A ≧ W ₁ )
- first optical film 2, the position in the width direction is within the existence range W _A of the adhesive layer 5.
- the width _{W 2} of the protective film 3 is higher width _{W A} of the adhesive layer 5. (W ₂ ≧ W _A )
· Protective film 3 is positioned so as to include the presence width W _A of the adhesive layer 5.

Here, “internal” means that the positions of both ends of one member are in the same position as the positions of both ends of the other member or in the outer position in the width direction.

Moreover, although the manufacturing method of 1st Embodiment is not an essential requirement, the following relationship is also satisfy | filled.
-The width W _R1 of the bonding roll 7a on the first optical film 2 side is equal to the width W _R2 of the bonding roll 7b on the protective film 3 side. (W _R1 = W _R2 )
, Width _{W R1} of the first optical film 2 side of the lamination rolls 7a is the first optical film 2 having a width _{W 1} or more. (W _R1 ≧ W ₁ )
- first optical film 2, the position in the width direction is within the existence range W _R1 of the first optical film 2 side of the lamination rolls 7a.
And protecting the width _W of the film 3 side of the lamination rolls 7b _R2 is greater than the width _{W A} of the adhesive layer 5. (W _R2 > W _A )
- lamination rolls 7b of the protective film 3 side, the position in the width direction are positioned so as to include the presence width W _A of the adhesive layer 5.
· Protective film 3 width _W of the lamination rolls 7b of side _R2 is greater than the width _{W 2} of the protective film 3. (W _R2 > W ₂ )
- lamination rolls 7b of the protective film 3 side is positioned such that the positions in the width direction containing the present width W ₂ of the protective film 3.

Here, the “width of the bonding roll” means the entire width of the portion that extends while maintaining the same diameter as the portion that becomes an effective contact surface that contributes to bonding. For example, in the case where there is a portion where the diameter in the width direction is reduced on the end side of the bonding rolls 7a and 7b and the first optical film 2 or the protective film 3 is not contacted, the portion excluding the reduced diameter portion Let width be the full width of the bonding rolls 7a and 7b.

From the viewpoint of more firmly holding the first optical film 2 with respect to the adhesive layer 5, the width W _A of the adhesive layer 5 is greater than the width W ₁ of the first optical film 2 (W _A> W ₁ ) is preferred. The width _{W A} of the adhesive layer 5 is preferably larger 0.5 ~ 100 mm than the width _{W 1} of the first optical film 2, and more preferably 1 ~ 50 mm high. Further, from the viewpoint of firmly holding the adhesive layer 5 with respect to the protective film 3, the width W ₂ of the protective film 3 is greater than the width W _A of the adhesive layer 5 (W _{2> W} _A) is preferable.

In this manufacturing method, the width W _A of the adhesive layer 5 is, and the first optical film 2 having a width W ₁ or more having a peelable resin substrate 21 and the polarizer 22 to each other, and the first optical film 2 position in the width direction is within the existence range W _a of the adhesive layer 5. For this reason, when it is going to peel the resin base material 21 from the 1st optical film 2 in 1 A of laminated optical films manufactured, the layer (polarizer 22) which remains on the laminated optical film 1A side is fully by the adhesive bond layer 5. Will be retained. Therefore, in the laminated optical film 1A manufactured by this manufacturing method, the polarizer 22 is difficult to tear when the resin base material 21 is peeled off.

Further, the first optical film 2, the position in the width direction is within the existence range W _R1 of the first optical film 2 side of the lamination rolls 7a, the first optical film 2 is the width W ₁ direction It will be pressed with the bonding roll over the whole area, and the adhesiveness of the 1st optical film 2 and the protective film 3 will increase.

Moreover, since the resin base material 21 and the polarizer 22 constituting the first optical film 2 are equal in width to each other and both ends are aligned, the film thickness of the end portion in the width direction as the first optical film 2 is obtained. Is stable.

In this first embodiment, the width W _R2 of the first width W _R1 of the optical film 2 side of the lamination rolls 7a protective film 3 side of the lamination rolls 7b showed equal aspects, these The widths of may be different. Further, these widths can be freely changed as long as the first optical film 2 and the protective film 3 are sufficiently bonded.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described. Differences from the first embodiment will be mainly described.

(Laminated optical film)
As shown in FIG. 4, the laminated optical film 1 </ b> B produced by the method for producing a laminated optical film of the second embodiment is a third optical film on the resin substrate 21 side of the first optical film 2. 6 are stacked.

Here, the third optical film 6 is a temporary protective film 6.

The temporary protective film 6 is a film for preventing the adhesive from adhering to the bonding roll, and damages the surface of the member (here, the first optical film 2) on which the temporary protective film 6 is laminated, It is a film for protecting from abrasion and the like. As the material of the temporary protective film 6, the same materials as the protective film can be used, and polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and polybutylene terephthalate are particularly preferable.

The temporary protective film 6 may have a pressure-sensitive adhesive layer having weak adhesion laminated on the surface of the film in addition to the film serving as the base material.

The thickness of the temporary protective film 6 is preferably 5 to 200 μm, more preferably 5 to 100 μm, still more preferably 5 to 50 μm.

(Manufacturing method of laminated optical film)
As a manufacturing method of the laminated optical film 1B, as shown in FIGS. 5 and 6, between the pair of rotating bonding rolls 7a and 7b, the first optical film 2, the adhesive layer 5, The protective film 3 is introduced in a state in which the protective film 3 is arranged in this order in the direction connecting the pair of bonding rolls 7 a and 7 b, and the first optical film 2 and the protective film 3 are bonded together. At this time, the temporary protective film 6 is interposed between the bonding roll 7 a on the first optical film 2 side and the first optical film 2.

The first optical film 2, the protective film 3, and the temporary protective film 6 are laminated to form a laminated body 4B, and the laminated body 4B is then cured by the adhesive layer 5, whereby the laminated optical film 1B shown in FIG. To be completed.

Existence mode of each member at the time of pasting is explained. As FIG. 6 shows, the width | variety of each film and adhesive bond layer between a pair of bonding rolls 7a and 7b satisfy | fills the following relationship.
In FIG. 6, the bonding rolls 7a and 7b are drawn away from the laminated body 4B in order to make the drawing easy to see.
, Width W _A of the adhesive layer 5 is the first optical film 2 having a width W ₁ or more. (W _A ≧ W ₁ )
- first optical film 2, the position in the width direction is within the existence range W _A of the adhesive layer 5.
- the width _{W 2} of the protective film 3 is higher width _{W A} of the adhesive layer 5. (W ₂ ≧ W _A )
· Protective film 3 is positioned so as to include the presence width W _A of the adhesive layer 5.
- the width W ₃ of the temporary protective film 6 has a width greater than the width W _A of the adhesive layer 5. (W ₃ > W _A )
- temporary protective film 6 is positioned so as to include a width W _A of the adhesive layer 5.

Width _{W A} of the adhesive layer 5 is greater than the width _{W 1} of the first optical film 2 is preferably larger 0.5 ~ 100 mm, and more preferably 1 ~ 50 mm high.

The magnitude relationship between the width of the protective film 3 and the width of the temporary protective film 6 is arbitrary.

Moreover, although the manufacturing method of 2nd Embodiment is not an essential requirement, the following relations are also satisfy | filled.
-The width W _R1 of the bonding roll 7a on the first optical film 2 side is equal to the width W _R2 of the bonding roll 7b on the protective film 3 side. (W _R1 = W _R2 )
, Width _{W R1} of the first optical film 2 side of the lamination rolls 7a is the first optical film 2 having a width _{W 1} or more. (W _R1 ≧ W ₁ )
- first optical film 2, the position in the width direction is within the existence range W _R1 of the first optical film 2 side of the lamination rolls 7a.
And protecting the width _W of the film 3 side of the lamination rolls 7b _R2 is greater than the width _{W A} of the adhesive layer 5. (W _R2 > W _A )
- lamination rolls 7b of the protective film 3 side, the position in the width direction are positioned so as to include the presence width W _A of the adhesive layer 5.
· Protective film 3 width _W of the lamination rolls 7b of side _R2 is greater than the width _{W 2} of the protective film 3. (W _R2 > W ₂ )
- lamination rolls 7b of the protective film 3 side is positioned such that the positions in the width direction containing the present width W ₂ of the protective film 3.

In the manufacturing method of the first embodiment, the adhesive protrudes from the end in the width direction of the first optical film 2 at the time of bonding, adheres to the bonding roll 7a, and may contaminate the bonding roll 7a. According to the manufacturing method of this 2nd Embodiment, it can prevent that an adhesive agent adheres to the said bonding roll 7a by interposing the wide temporary protective film 6.

In this second embodiment showed the width W _R2 are equal manner the width W _R1 and the protective film 3 side of the lamination rolls 7b of the first optical film 2 side of the lamination rolls 7a, these As in the case of the first embodiment, the width may be variously changed.

(Modification of the first and second embodiments)
The first and second embodiments can be implemented as the following aspects. That is, the first optical film 2 is a laminated optical film 1A manufactured by the manufacturing method of the first embodiment, the second optical film 3 is a separator, and these are pasted with an adhesive instead of an adhesive. It is good also as an aspect to match. In this case, a separator is laminated on the protective film 3 side of the laminated optical film 1A, and the completed laminated optical film is a polarizing plate with a separator. Hereinafter, this aspect will be described.

The pressure-sensitive adhesive layer is a layer that functions when the polarizing plate is attached to another article (for example, a liquid crystal cell). The pressure-sensitive adhesive layer can be composed of acrylic resin, silicone resin, polyester, polyurethane, polyether, or the like.

The thickness of the pressure-sensitive adhesive layer is preferably 2 to 500 μm, more preferably 2 to 200 μm, still more preferably 2 to 50 μm.

As a method of laminating the pressure-sensitive adhesive layer on the polarizing plate, for example, a method of applying a solution containing the above resin or any additional component to the polarizing plate may be applied. After forming the pressure-sensitive adhesive layer with the solution on the separator, the polarizing plate The method of laminating may be used.

The separator is a peelable film that is attached for the purpose of protecting the pressure-sensitive adhesive layer or preventing the adhesion of foreign matters, and is peeled off when the polarizing plate is used to expose the pressure-sensitive adhesive layer. The separator can be made of, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, and the like. Among these, a stretched film of polyethylene terephthalate is preferable.

The separator may be subjected to a release treatment with a silicone resin or the like on the surface in contact with the pressure-sensitive adhesive layer so that the separator can be easily peeled off.

The thickness of the separator is preferably 10 to 500 μm, more preferably 10 to 300 μm, and still more preferably 10 to 200 μm.

Even if it is the said aspect, when the resin base material 21 is peeled by the effect | action similar to the said embodiment, it can prevent that the polarizer 22 tears.

<Third Embodiment>
Hereinafter, a third embodiment of the present invention will be described. Differences from the first embodiment will be mainly described.

(Laminated optical film)
As shown in FIG. 7, the laminated optical film 1 </ b> C produced by the method for producing a laminated optical film of the fourth embodiment has a width between the resin base material 21 and the polarizer 22 in the first optical film 2. The width of the resin base material 21 is larger than the width of the polarizer 22.

In addition, the magnitude relationship and the positional relationship of the widths of the resin base material 21, the polarizer 22, the protective film 3, and the adhesive layer 5 are as described later, and these layers have a central axis in each width direction. It is almost complete. That is, in the cross-sectional view shown in FIG.

(Manufacturing method of laminated optical film)
As a manufacturing method of the laminated optical film 1C, as shown in FIG. 2 and FIG. 8, a resin base material 21, a polarizer 22, and an adhesive layer are interposed between a pair of rotating bonding rolls 7a and 7b. 5 and the protective film 3 are introduced in a state in which they are arranged in this order in the direction connecting the pair of bonding rolls 7a and 7b, and the polarizer 22 and the protective film 3 are bonded together.

Here, the polarizer 22 in the first optical film 2 is coated only at the center in the width direction of the resin base material 21 and both ends are uncoated and dried, and after the entire resin base material 21 is stretched. Supplied by dyeing with iodine or dichroic dye and boric acid treatment, washing with water and drying.

The resin base material 21, the polarizer 22 and the protective film 3 are laminated to form a laminated body 4C, and the laminated body 4C is then completed as the laminated optical film 1C shown in FIG. 7 by curing the adhesive layer 5. .

Existence mode of each member at the time of pasting is explained. As FIG. 8 shows, the width | variety of each film and the adhesive bond layer 5 between a pair of bonding rolls 7a and 7b satisfy | fills the following relationships. In FIG. 8, the bonding rolls 7a and 7b are drawn away from the laminate 4C in order to make the drawing easier to see.
The width W ₁₂ of the polarizer 22 is smaller than the width W ₁₁ of the resin base material 21. (W ₁₁ > W ₁₂ )
, Width _{W A} of the adhesive layer 5 is the width _{W 12} or polarizer 22, and is smaller than the width _{W 11} of the resin substrate 21. (W ₁₁ > W _A ≧ W ₁₂ )
· Polarizer 22, the position in the width direction is within the existence range W _A of the adhesive layer 5.
Resin substrate 21 is positioned so as to include the presence width W _A of the present width W ₁₂ and the adhesive layer 5 of the polarizer 22.
- the width _{W 2} of the protective film 3 is higher width _{W A} of the adhesive layer 5. (W ₂ ≧ W _A )
· Adhesive layer 5, the position W _A in the width direction is within the existence range W ₂ of the protective film 3.

Width _{W A} of the adhesive layer 5 is greater than the width _{W 12} of the polarizer 22 is preferably larger 0.5 ~ 100 mm, and more preferably 1 ~ 50 mm high.

Incidentally, the magnitude relationship between the width W ₁₂ of the resin substrate 21 and the width W ₂ of the protective film 3 is optional.

The manufacturing method of the fourth embodiment is not an essential requirement, but also satisfies the following relationship.
-The width W _R1 of the bonding roll 7a on the first optical film 2 side is equal to the width W _R2 of the bonding roll 7b on the protective film 3 side. (W _R1 = W _R2 )
, Width _{W R1} of the first optical film 2 side of the lamination rolls 7a is a width _{W 12} or wider _{W 11} and the polarizer 22 of the resin substrate 21. (W _R1 ≧ W ₁₁ and W _R1 ≧ W ₁₂ )
Resin substrate 21 and the polarizer 22 are both in the width direction position is within the existence range W _R1 of the first optical film 2 side of the lamination rolls 7a.
And protecting the width _W of the film 3 side of the lamination rolls 7b _R2 is greater than the width _{W A} of the adhesive layer 5. (W _R2 > W _A )
- lamination rolls 7b of the protective film 3 side, the position in the width direction are positioned so as to include the presence width W _A of the adhesive layer 5.
· Protective film 3 width _W of the lamination rolls 7b of side _R2 is greater than the width _{W 2} of the protective film 3. (W _R2 > W ₂ )
- lamination rolls 7b of the protective film 3 side is positioned such that the positions in the width direction containing the present width W ₂ of the protective film 3.

From the viewpoint of more firmly hold the polarizer 22 with respect to the adhesive layer 5, the width _{W A} of the adhesive layer 5 is larger than the width _{W 12} of the polarizer 22 _(W _{A> W 12)} is preferably. Further, from the viewpoint of firmly holding the adhesive layer 5 with respect to the protective film 3, the width W ₂ of the protective film 3 is greater than the width W _A of the adhesive layer 5 (W _{2> W} _A) is preferable.

In this manufacturing method, the width W _A of the adhesive layer 5 is, and the width or more of the polarizer 22, and, a polarizer 22 is positioned in the width direction is within the existence range W _A of the adhesive layer 5. For this reason, when it is going to peel the resin base material 21 in manufactured laminated optical film 1C, the layer (polarizer 22) which remains on the laminated optical film 1C side will be fully hold | maintained by the adhesive bond layer 5. FIG. Therefore, according to this manufacturing method, when the resin base material 21 is peeled off, it is possible to manufacture a laminated optical film 1C in which other layers are difficult to tear.

Further, in this manufacturing method, the width W _{12 of the} polarizer 22 is smaller than the width W _{11 of} the resin base material 21, and the resin base material 21 has an existing width W ₁₂ of the polarizer 22 and an existing width W of the adhesive layer 5. Since it is located so as to enclose _A , it is possible to prevent the adhesive from adhering to the bonding roll 7a on the resin base material 21 side. When the width W _R1 of the bonding roll 7a is smaller than the width W _{11 of} the resin base material 21 and the resin base material 21 is positioned so as to include the existing width W _R1 of the bonding roll 7a, It is possible to further prevent the adhesive from adhering to the combined roll 7a.

According to each of the embodiments described above, it is possible to manufacture laminated optical films 1A to 1C that are difficult to tear when the resin substrate 21 is peeled off. When the polarizer 22 is included in the first optical film 2, the strength of the polarizer 22 is lower than other constituent films, and scratches and tears are likely to occur. Therefore, when the resin substrate 21 is peeled off, Cracks are likely to occur at the portions (particularly at the ends). In the case of this embodiment, since the layer (polarizer) remaining on the laminated optical film side is sufficiently held by the adhesive layer 5, in the case where the first optical film 2 includes a low-strength polarizer 22. Even if it exists, generation | occurrence | production of a tear can be fully suppressed when peeling the resin base material 21. FIG.

The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

For example, in each of the above embodiments, the polarizer 22 is applied to one surface of the resin base material 21, but the polarizer 22 may be applied to both surfaces of the resin base material 21. In this case, after the laminated optical films 1A to 1C are manufactured, the polarizer 22 remaining on the resin base material 21 side is peeled off by peeling between the polarizer 22 facing the adhesive layer 5 and the resin base material 21. Can be used for the production of another polarizing plate.

Moreover, in each said embodiment, although demonstrated using the example of the 1st optical film in which the polarizer 22 was provided in the single side | surface of the resin base material 21, what is the polarizer 22 in the single side | surface or both surfaces of the resin base material 21? Another optical functional layer may be provided. Examples of the optical functional layer other than the polarizer 22 include a retardation layer, a viewing angle compensation layer, and the like. A liquid in which a material having a target optical function is dissolved or dispersed is applied onto the resin base material 21 and dried. Can be provided. And when the resin base material 21 is peeled, the optical function layer can be prevented from tearing.

DESCRIPTION OF SYMBOLS 1A-1C ... Laminated optical film, 2 ... 1st optical film, 3 ... Protective film (2nd optical film), 4A-4C ... Laminated body, 5 ... Adhesive layer, 6 ... Temporary protective film (3rd optical film), 7a ... first optical film side of the lamination rolls, 7b ... protective film side of the lamination rolls, 10 ... polarizing plate, 21 ... resin substrate 22 ... polarizer, W 1 _... first optical Width of film, W ₁₁ ... width of resin base material, W ₁₂ ... width of polarizer, W ₂ ... width of protective film, W ₃ ... width of temporary protective film, W _A ... width of adhesive layer, W _R1 ... first optical film side of the lamination rolls the width, W _{R2 ...} protective film side of the width of the lamination rolls.

Claims

Between a pair of rotating bonding rolls, the pair of bonding rolls includes a first optical film having a plurality of layers that can be peeled from each other, an adhesive layer or a pressure-sensitive adhesive layer, and a second optical film. It is a method for producing a laminated optical film, wherein the first optical film and the second optical film are bonded in a state where they are arranged in this order in the connecting direction,
At the time of pasting,
The width of the adhesive layer or the pressure-sensitive adhesive layer is not less than the width of the first optical film,
The first optical film has a width direction position within the width of the adhesive layer or the pressure-sensitive adhesive layer;
The width of the second optical film is not less than the width of the adhesive layer or the pressure-sensitive adhesive layer,
The method for producing a laminated optical film, wherein the second optical film is positioned so as to include the existing width of the adhesive layer or the pressure-sensitive adhesive layer.
The width of the bonding roll on the first optical film side is equal to or greater than the width of the first optical film,
The method for producing a laminated optical film according to claim 1, wherein the first optical film has a position in the width direction within an existing width of the bonding roll on the first optical film side.
A third optical film having a width larger than the width of the adhesive layer or the pressure-sensitive adhesive layer is bonded between the bonding roll on the first optical film side and the first optical film. The manufacturing method of the laminated | multilayer optical film of Claim 1 or 2 to interpose so that the width | variety of an agent layer or the said adhesive layer may be included.
The first optical film has a resin base and an optical functional layer provided on one side or both sides of the resin base,
The resin base material and the optical functional layer have the same width and both ends aligned,
The first optical film is arranged so that the optical functional layer side faces the adhesive layer or the pressure-sensitive adhesive layer side,
The method for producing a laminated optical film according to any one of claims 1 to 3, wherein the second optical film is a protective film.
The method for producing a laminated optical film according to claim 4, wherein the optical functional layer is a polarizer.
The method for producing a laminated optical film according to claim 5, wherein the polarizer is provided by being applied to the resin base material.
Between the pair of rotating bonding rolls, the resin base material, the optical functional layer provided on one or both surfaces of the resin base material, the adhesive layer or the pressure-sensitive adhesive layer, and the protective film, It is a manufacturing method of a lamination optical film which introduces in the state arranged in this order in the direction which connects between pasting rolls, and pastes together the above-mentioned optical functional layer and the above-mentioned protective film,
At the time of pasting,
The width of the optical functional layer is smaller than the width of the resin base material,
The width of the adhesive layer or the pressure-sensitive adhesive layer is not less than the width of the optical functional layer, and is smaller than the width of the resin base material,
The optical function layer has a position in the width direction within the existing width of the adhesive layer or the pressure-sensitive adhesive layer,
The resin base material is positioned so as to include the existing width of the optical functional layer and the adhesive layer or the pressure-sensitive adhesive layer,
The width of the protective film is not less than the width of the adhesive layer or the pressure-sensitive adhesive layer,
The adhesive layer or the pressure-sensitive adhesive layer is a method for producing a laminated optical film, wherein the position in the width direction is within the existing width of the protective film.
The width of the bonding roll on the resin substrate side is equal to or greater than the width of the optical functional layer,
The said optical function layer is a manufacturing method of the laminated optical film of Claim 7 which has the position of the width direction within the existing width of the said bonding roll by the side of the said resin base material.
The method for producing a laminated optical film according to claim 7 or 8, wherein the optical functional layer is a polarizer.
The method for producing a laminated optical film according to claim 9, wherein the polarizer is provided by being applied to the resin base material.