JP2017156772A - Method for producing laminated optical film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a laminated optical film capable of preventing stain of a sticking roll caused by an adhesive or a sticking agent used in sticking of optical films.SOLUTION: In a method for producing a laminated optical film which includes introducing a resin base material, an optical functional layer, an adhesive layer or a sticking agent layer and an optical protective film between a pair of rotating sticking rolls and sticking the substances, during sticking, a width of the optical functional layer is smaller than a width of the resin base material and a width of the adhesive layer or the sticking agent layer is smaller than the width of the optical functional layer, the resin base material is positioned so as to include an existence width of the optical functional layer and the adhesive layer or the sticking agent layer, the optical functional layer is positioned so as to include an existence with of the adhesive layer or the sticking agent layer, a width of the optical film is larger than the width of the adhesive layer or the sticking agent layer, and the optical film is positioned so as to include an existence width of the adhesive layer or the sticking agent layer.SELECTED DRAWING: None

Description

  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.

JP 2014-172290 A

  When the adhesive or pressure-sensitive adhesive protrudes from the end in the width direction of the optical film during bonding, the adhesive or pressure-sensitive adhesive adheres to the bonding roll and becomes dirty. And the adhesive agent or adhesive agent adhering to the bonding roll is transferred to a subsequent optical film, and can cause blocking when the laminated optical film is rolled up.

  An object of this invention is to provide the manufacturing method of a laminated optical film which can prevent the stain | pollution | contamination of the bonding roll by the adhesive agent or adhesive used for bonding of optical films.

  The present invention provides a first optical film, an adhesive layer or a pressure-sensitive adhesive layer, and a second optical film between a pair of rotating bonding rolls in a direction connecting the pair of bonding rolls. It is the manufacturing method of a lamination | stacking optical film which introduce | transduces in the state arranged in order and bonds a 1st optical film and a 2nd optical film, Comprising: At the time of bonding, the width | variety of an adhesive bond layer or an adhesive layer is The width of the first optical film is equal to or larger than the width of the adhesive layer or the pressure-sensitive adhesive layer, and the width of the second optical film is the adhesive layer. Or it is larger than the width | variety of an adhesive layer, and the 2nd optical film is located so that the existing width of an adhesive bond layer or an adhesive layer may be included, and the 1st optical film side bonding roll and 1st Between the optical film and the width of the adhesive layer or the pressure-sensitive adhesive layer is larger 3 of the optical film, so as containing the width of the adhesive layer or pressure-sensitive adhesive layer is interposed, to provide a method of manufacturing a laminated optical film.

  According to this manufacturing method, at the time of pasting with the 1st optical film and the 2nd optical film, between an adhesive layer or an adhesive layer, and a pasting roll rather than an adhesive layer or an adhesive layer. Since the wide 2nd optical film or 3rd optical film is interposing, the stain | pollution | contamination of the bonding roll by an adhesive agent or an adhesive can be prevented.

  In this manufacturing method, the width of the bonding roll on the first optical film side is smaller than the width of the third optical film, and the bonding roll on the first optical film side has a position in the width direction of the first. It is good also as an aspect which exists in the existing width of 3 optical films. In this case, the bonding roll is further prevented from being stained with the adhesive or the pressure-sensitive adhesive.

  In another aspect, the present invention provides a first optical film, an adhesive layer or a pressure-sensitive adhesive layer, and a second optical film between a pair of bonding rolls, between a pair of rotating bonding rolls. It is the manufacturing method of a lamination | stacking optical film which introduce | transduces in the state arranged in this order in the direction which ties, and bonds a 1st optical film and a 2nd optical film, Comprising: At the time of bonding, it is an adhesive bond layer or adhesion The width of the agent 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, and the width of the second optical film. Is larger 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 width of the adhesive layer or the pressure-sensitive adhesive layer, and is attached to the first optical film side. The width of the combined roll is smaller than the width of the first optical film, and the first optical film Arm side lamination rolls of the position in the width direction is within the existence range of the first optical film, to provide a method of manufacturing a laminated optical film.

  According to this manufacturing method, the adhesive layer or the pressure-sensitive adhesive layer protrudes from the width of the first optical film, but the width of the bonding roll on the first optical film side is the width of the first optical film. Since the position in the width direction of the bonding roll on the first optical film side is within the width of the first optical film, the bonding roll may be soiled by the adhesive or the pressure-sensitive adhesive. Is prevented.

  Moreover, this invention is another aspect. WHEREIN: Between a pair of rotating bonding rolls, a 1st optical film, an adhesive bond layer or an adhesive layer, and a 2nd optical film are bonded to a pair. A method for producing a laminated optical film, wherein the first optical film and the second optical film are bonded in a state in which they are arranged in this order in the direction connecting the rolls. Alternatively, the width of the pressure-sensitive adhesive layer is less than the width of the first optical film, and the position of the adhesive layer or pressure-sensitive adhesive layer in the width direction is within the width of the first optical film, and the second optical film. Is larger 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. I will provide a.

  According to this manufacturing method, since the possibility that the adhesive layer or the pressure-sensitive adhesive layer protrudes from the width of the first optical film and the second optical film is extremely small, dirt on the bonding roll due to the adhesive or the pressure-sensitive adhesive is removed. Can be prevented.

  In this manufacturing method, the width of the bonding roll on the first optical film side is smaller than the width of the first optical film, and the bonding roll on the first optical film side has a position in the width direction of the first. It is good also as an aspect which exists in the existing width of 1 optical film. In this case, the bonding roll is further prevented from being stained with the adhesive or the pressure-sensitive adhesive.

  In this production method, the width of the adhesive layer or the pressure-sensitive adhesive layer may be 0.1 to 50 mm smaller than the width of the first optical film. In this case, the first optical film and the second optical film can be sufficiently bonded or adhered to the end in the width direction.

  In each manufacturing method described above, 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 mutually connected. The width is equal and both ends are 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, and the second optical film is a protective film Also good. In this aspect, the first optical film has the resin base material and the optical functional layer, but the film thickness at the end in the width direction is stable.

  The optical functional layer may be a polarizer. At this time, the polarizer may be provided by being applied to a resin substrate.

  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 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 larger than the width of the adhesive layer or the pressure-sensitive adhesive layer, Laminated optics that is positioned to contain the width of the adhesive layer or adhesive layer To provide a method of manufacturing a Irumu.

  According to this manufacturing method, the resin base material wider than the adhesive layer or the pressure-sensitive adhesive layer is interposed between the adhesive layer or the pressure-sensitive adhesive layer and the bonding roll when the optical functional layer and the protective film are bonded. Or since the protective film intervenes, the stain | pollution | contamination of the bonding roll by an adhesive agent or an adhesive can be prevented.

  In this manufacturing method, the width of the bonding roll on the resin substrate side is smaller than the width of the resin substrate, and the bonding roll on the resin substrate side has a position in the width direction within the existing width of the resin substrate. It is good also as an aspect in. In this case, the bonding roll is further prevented from being stained with the adhesive or the pressure-sensitive adhesive.

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

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a lamination | stacking optical film which can prevent the stain | pollution | contamination of the bonding roll by the adhesive agent or adhesive used for bonding of optical films 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. It is sectional drawing of the laminated optical film manufactured with the manufacturing method of 4th Embodiment. It is a figure which shows the lamination | stacking state at the time of bonding of 4th Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the 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. The third optical film 6 is laminated on the other surface of the first optical film 2 with the agent layer 5 interposed therebetween. 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 1A is used as a polarizing plate 10 from which the third optical film 6 and the resin base material 21 are removed, and which includes a polarizer 22 and a second optical film (= protective film described later) 3. is there. 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 base material 21 side or the second optical film 3 side that is peeled off as necessary. .

  The first optical film 2, the second optical film 3, the third optical film 6 and the adhesive layer 5 are as described later in relation to the magnitude and positional relationship of the widths. The central axes of directions are almost aligned. That is, in the cross-sectional view shown in FIG.

  Here, the structure of each film and the adhesive bond layer 5 is demonstrated. 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. A film-like polarizer 22 can be obtained by subjecting these materials to stretching treatment, dyeing with iodine or a dichroic dye, and boric acid treatment. A film obtained by cutting out the film-like polarizer 22 into an arbitrary size may be used as the first optical film 2, and a laminated body in which the resin base material 21 is bonded to one or both sides via an adhesive. 1 optical film 2 may be used.

  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 that extends in the film longitudinal direction (film transport direction), lateral stretching that extends 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, and 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, and still more preferably 50 to 200 μm.

  Here, the second optical film 3 is the protective film 3, and the third optical film 6 is the temporary protective film 6.

  The protective film 3 is a film that prevents the main surface and end portions of the polarizer 22 from being cracked or damaged. 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 an epoxy resin, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, etc. are preferable, for example. 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.

  As the adhesive, acrylic resins such as acrylamide, acrylate, urethane acrylate, and epoxy acrylate, and polyvinyl alcohol-based water-based adhesives can also 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.

  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, and still more preferably 5 to 50 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. 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.

  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, the protective film 3, and the temporary protective film 6 are laminated to form a laminated body 4A, and the laminated body 4A is then cured by the adhesive layer 5, whereby the laminated optical film shown in FIG. Completed as 1A.

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.
, 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 greater than the 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 is larger than the width W _A of the adhesive layer 5. (W ₃ > W _A )
- temporary protective film 6 is interposed so as to include the presence width W _A of the adhesive layer 5.

  Here, “internal” means that both end portions of the member on the wide side are located on the outer side in the width direction than both end portions of the member on the narrow side.

  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 1st Embodiment is not an essential requirement, the following relationship is also satisfy | filled.
-The width W _R1 of the bonding roll 7 a on the first optical film 2 side is smaller than the width W ₃ of the temporary protective film 6. (W ₃ > W _R1 )
- first optical film 2 side of the lamination rolls 7a, the position in the width direction is within the existence range W ₃ of the temporary protective film 6.
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 extending while maintaining the same diameter as the portion serving as an effective contact surface contributing to the 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, Let width be the full width of the bonding rolls 7a and 7b.

Width W _R1 of the first optical film 2 side of the lamination rolls 7a is preferably smaller than the width W _A of the adhesive layer 5, and more preferably less than the width W ₁ of the first optical film 2 . Moreover, it is preferable that width W _R1 of the bonding roll 7a is 1-100 mm smaller than width W _{3 of} the 3rd optical film 6, and it is more preferable that it is 1-50 mm smaller.

  According to this manufacturing method, the protective film wider than the adhesive layer 5 between the adhesive layer 5 and the bonding rolls 7a and 7b when the first optical film 2 and the protective film 3 are bonded. 3 or the temporary protective film 6 is interposed, so that the bonding rolls 7a and 7b can be prevented from being soiled by the adhesive.

Moreover, in this manufacturing method, the width W _R1 of the bonding roll 7a on the first optical film 2 side is smaller than the width W ₃ of the temporary protective film 6 and the bonding roll on the first optical film 2 side. 7a, the position in the width direction because in the present width W ₃ of the temporary protective film 6, the lamination rolls 7a is be contaminated by the adhesive is further prevented.

  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.

Further, since the 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),} upon the release of the resin substrate 21 from the polarizer 22, the polarizer 22 Is prevented from tearing.

Incidentally, the width W _R2 of the first in the embodiment the protective film 3 side of the lamination rolls 7b showed greater aspect than the width W ₂ of the protective film 3, the width of the lamination rolls 7b, the protective film 3 it may be smaller than the width W ₂ of the. In this case, the lamination rolls 7b is to be positioned in the presence width W ₂ of the protective film 3. According to this, it is further prevented that the bonding roll 7b is soiled by the adhesive.

<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 manufactured by the method for manufacturing a laminated optical film of the second embodiment does not include the third optical film 6.

(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.

  The 1st optical film 2 and the protective film 3 are laminated | stacked, and it becomes the laminated body 4B, and the laminated body 4B is completed as the laminated | multilayer optical film 1B shown by FIG. 4 after that the adhesive bond layer 5 hardens | cures.

Existence mode of each member at the time of pasting is explained. As FIG. 6 shows, the width | variety of each film between the pair of bonding rolls 7a and 7b, the adhesive bond layer 5, and the bonding roll 7a satisfy | fills the following relationships. 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 greater than the 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 _R1 of the bonding roll 7 a on the first optical film 2 side is smaller than the width W _{1 of} the first optical film 2. (W ₁ > W _R1 )
-As for the bonding roll 7a by the side of the 1st optical film 2, the position of the width direction exists in the existing width W1 of the _1st optical film 2. FIG.

Here, the width W _R1 of the bonding roll 7a on the first optical film 2 side is preferably ₁ to 200 mm smaller than the width W _{1 of} the first optical film 2, and more preferably ₁ to 100 mm smaller.

Moreover, although the manufacturing method of 2nd Embodiment is not an essential requirement, the following relations are also satisfy | filled.
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.

According to this manufacturing method, the adhesive layer 5 protrudes from the first presence width of the optical film 2, the width W _R1 of the first optical film 2 side of the lamination rolls 7a is, the first optical film The width of the bonding roll 7a on the first optical film 2 side is smaller than the width W _{1 of} 2, and the position in the width direction is within the existing width W _{1 of} the first optical film 2, so that the bonding roll 7a is prevented from being soiled by the adhesive.

Incidentally, the width W _R2 of the second in the embodiment the protective film 3 side of the lamination rolls 7b showed greater aspect than the width W ₂ of the protective film 3 protects the width W _R2 of lamination rolls 7b Film 3 may be smaller than the width W ₂ as in the case of the first embodiment.

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

(Laminated optical film)
As shown in FIG. 7, in the laminated optical film 1 </ b> C manufactured by the method for manufacturing a laminated optical film of the third embodiment, the width of the first optical film 2 is larger than the width of the adhesive layer 5.

  In addition, the width relationship between the first optical film 2, the protective film 3, and the adhesive layer 5 and the positional relationship are as described later, and these layers have substantially the same center axis in each width direction. ing. 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 FIGS. 5 and 8, 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.

  The 1st optical film 2 and the protective film 3 are laminated | stacked, and it becomes the laminated body 4C, and the laminated body 4C is completed as the laminated optical film 1C shown by FIG. 7 after that the adhesive bond layer 5 hardens | cures.

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 _A of the adhesive layer 5 is less than the width W _{1 of} the first optical film 2. (W ₁ > W _A )
The adhesive layer 5 has a position in the width direction within the existing width W _{1 of} the first optical film 2.
- 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 )
· Protective film 3 is positioned so as to include the presence width W _A of the adhesive layer 5.

Here, the width _{W A} of the adhesive layer 5 is preferably first 0.1~50mm smaller than the width _{W 1} of the optical film 2, it is more preferable 0.1~20mm small, 0.1 More preferably, it is 5 mm smaller. In this case, the 1st optical film 2 and the protective film 3 can fully be adhere | attached to the edge part of the width direction.

Although the magnitude relation between the width W ₂ of the first width W ₁ of the optical film 2 and the protective film 3 is arbitrary, it is taken here to be the same. (W ₁ = W ₂ )

Further, the manufacturing method of the third embodiment is not an essential requirement, but also satisfies the following relationship.
- Both the lamination rolls 7a, the width _W of 7b _{R1, W R2} is greater than the width _{W 2} of the first width _{W 1} and the protective film 3 of the optical film 2, respectively. (W _R1 > W ₁ and W _R2 > W ₂ )
- Both the lamination rolls 7a, 7b, the position in the width direction is positioned so as to include the presence width W ₂ of the first present width W ₁ and the second optical film 3 of the optical film 2, respectively.

Although the magnitude relationship of the width | variety of both the bonding rolls 7a and 7b is arbitrary, it is the same here. (W _R1 = W _R2 )

  According to this manufacturing method, since the possibility that the adhesive layer 5 protrudes the existing width of the first optical film 2 and the protective film 3 is extremely small, it is possible to prevent the bonding rolls 7a and 7b from being soiled by the adhesive. it can.

Incidentally, the third lamination rolls 7a in the embodiment, although 7b width _{W R1, W R2} of showed greater aspect than the width _{W 2} of the first width _{W 1} and the protective film 3 of the optical film 2, respectively , lamination rolls 7a, the width of 7b may be smaller than the width W ₂ of the first width W ₁ and the protective film 3 of the optical film 2 may be smaller than the width W _a of the adhesive layer 5. In this case, the lamination rolls 7a, 7b, the first inner presence width W ₁ of the optical film 2, respectively, to be located within the existing width W ₂ of the protective film 3. According to this, it is further prevented that the bonding rolls 7a and 7b are soiled by the adhesive.

  In the third embodiment, the adhesive layer 5 is applied to the protective film 3 as in the first embodiment. However, the adhesive layer 5 is applied to the polarizer 22 side. May be provided.

(Modification of the first to third embodiments)
The said 1st-3rd embodiment can also be implemented as the following aspects. That is, the first optical film 2 is a polarizing plate (for example, a polarizing plate having the configuration of the polarizing plate 10 shown in FIG. 1), the second optical film 3 is a separator, and these are used as an adhesive. It is good also as an aspect replaced with an adhesive instead. In this case, a polarizing plate with a separator is manufactured as a laminated optical film. 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, and 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 stuck 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, so that the pressure-sensitive adhesive layer is exposed. 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, the stain | pollution | contamination of the bonding rolls 7a and 7b by an adhesive can be prevented by the effect | action similar to the said embodiment.

  When using a polarizing plate as the 1st optical film 2, what laminated | stacked the protective film through the adhesive agent on the single side | surface or both surfaces of a polarizer is normally used. In the case of a polarizing plate in which a protective film is laminated only on one side of the polarizer, the surface opposite to the side on which the protective film is laminated may be laminated so as to be on the adhesive layer side. The polarizing plate may further include a protective layer for protecting the other optical layer or the protective film surface 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. As the protective layer for protecting the surface of the protective film, a general transparent resin film can be used. 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. The protective layer that protects the surface of the protective film may be a film that does not have an optical function, or may be a film that has an optical function such as a retardation film or a brightness enhancement film.

<Fourth Embodiment>
The fourth embodiment of the present invention will be described below. Differences from the second embodiment will be mainly described.

(Laminated optical film)
As shown in FIG. 9, the laminated optical film 1 </ b> D manufactured by the method for manufacturing 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 shown in FIGS. 5 and 10, the manufacturing method of the laminated optical film 1 </ b> D includes a resin base material 21, a polarizer 22, and an adhesive layer between a pair of rotating bonding rolls 7 a and 7 b. 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 4D. The laminated body 4D is then completed as the laminated optical film 1D shown in FIG. 9 by curing the adhesive layer 5. .

Existence mode of each member at the time of pasting is explained. As FIG. 10 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. 10, the bonding rolls 7a and 7b are drawn away from the laminated body 4D in order to make the drawing easy 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 )
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 greater than the 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.

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 resin base material 21 side is smaller than the width W ₁₁ of the resin base material 21. (W ₁₁ > W _R1 )
-As for the bonding roll 7a by the side of the resin base material 21, the position of the width direction exists in the existing width of the resin base material 21. FIG.
· 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 W _R1 of the resin base material 21 side of the lamination rolls 7a is preferably smaller than the width W _A of the adhesive layer 5, and more preferably less than the width W ₁₂ of the polarizer 22. The width _{W R1} lamination roll 7a is preferably 1~100mm smaller than the width _{W 11} of the resin substrate 21, and more preferably 1~50mm small.

  According to this manufacturing method, at the time of bonding of the polarizer 22 and the protective film 3, the resin substrate 21 wider than the adhesive layer 5 or between the adhesive layer 5 and the bonding rolls 7 a and 7 b. Since the protective film 3 is interposed, it is possible to prevent the bonding rolls 7a and 7b from being soiled by the adhesive.

Further, in this manufacturing method, the width W _R1 of the resin base material 21 side of the lamination rolls 7a is smaller than the width of the resin substrate 21, and, lamination rolls 7a of the resin substrate 21 side, in the width direction the position is within the present width W ₁₁ of the resin substrate 21, the lamination rolls 7a that is prevented more contaminated by the adhesive.

  In the fourth embodiment, the first optical film 2 may be a polarizing plate. As a polarizing plate, what laminated | stacked the protective film through the adhesive agent on the single side | surface or both surfaces of a polarizer may be used. And a polarizer should just be smaller than the width | variety of a protective film, and exists in the existing width of a protective film. In the case of a polarizing plate in which a protective film is laminated only on one side of the polarizer, the surface opposite to the side on which the protective film is laminated may be laminated so as to be on the adhesive layer side. The polarizing plate may further include a protective layer for protecting the other optical layer or the protective film surface 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. As the protective layer for protecting the surface of the protective film, a general transparent resin film can be used. 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. The protective layer that protects the surface of the protective film may be a film that does not have an optical function, or may be a film that has an optical function such as a retardation film or a brightness enhancement film.

  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 manufacturing the laminated optical films 1 </ b> A to 1 </ b> D, the polarizer 22 remaining on the resin substrate 21 side is removed by peeling between the polarizer 22 facing the adhesive layer 5 and the resin substrate 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. Thus, the layer can be provided.

DESCRIPTION OF SYMBOLS 1A-1D ... Laminated optical film, 2 ... 1st optical film, 3 ... Protective film (2nd optical film), 4A-4D ... 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 (5)

Between the pair of rotating bonding rolls, the resin base, the optical functional layer provided on one or both sides of the resin base, the adhesive layer or the pressure-sensitive adhesive layer, and the optical film, It is a manufacturing method of a laminated optical film which introduces in the state arranged in this order in the direction connecting between bonding rolls, and bonds the optical functional layer and the optical 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 smaller than the width of the optical function 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 optical functional layer is positioned so as to include the existing width of the adhesive layer or the pressure-sensitive adhesive layer,
The width of the optical film is larger than the width of the adhesive layer or the pressure-sensitive adhesive layer,
The said optical film is a manufacturing method of the lamination | stacking optical film located so that the existing width | variety of the said adhesive bond layer or the said adhesive layer may be included. The width of the bonding roll on the resin substrate side is smaller than the width of the resin substrate,
The method for producing a laminated optical film according to claim 1, wherein the bonding roll on the resin substrate side has a position in the width direction within an existing width of the resin substrate.   The method for producing a laminated optical film according to claim 1, wherein the optical functional layer is provided by being applied to the resin base material.   The method for producing a laminated optical film according to claim 1, wherein the optical functional layer is a polarizer.   The method for producing a laminated optical film according to claim 1, wherein the optical film is a protective film.

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