JP2018063415A - Optical film and production method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical film in which generation of blisters is reduced.SOLUTION: The optical film has a polarizing plate and a protection film bonded to the surface of the polarizing plate. The polarizing plate includes a polarizer and a protective film laminated on the polarizer. The protection film includes an adhesive layer and a protection layer laminated on the polarizing plate via the adhesive layer. In a width direction of the optical film, a side end of the protective film is located outside a side end of the polarizer; a side end of the protection layer is located outside the side end of the polarizer; the side end of the protection layer is located at the same position as a side end of the adhesive layer or located outside the side end of the adhesive layer; and the side end of the protective film is located outside the side end of the adhesive layer. A ratio L1/L2, where L1 is a width dimension between the side end of the protection layer and the side end of the adhesive layer, and L2 is a width dimension between the side end of the protective film and the side end of the adhesive layer, is 0 or more and 0.27 or less.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an optical film and a method for producing the same.

  Conventionally, as an optical film, there exists what was described in Unexamined-Japanese-Patent No. 2014-102353 (patent document 1). This optical film has a polarizing plate and a protective film bonded to the surface of the polarizing plate. The polarizing plate includes a polarizer and a protective film laminated on the polarizer. The protect film includes an adhesive layer and a protect layer laminated on the polarizing plate via the adhesive layer.

JP 2014-102353 A

  By the way, when actually trying to manufacture and use the conventional optical film, it has been found that there are the following problems. That is, during storage or processing of the optical film, there may be a case where floating occurs between the adhesive layer of the protective film and the protective film of the polarizing plate at the end in the width direction of the optical film. When this floating occurs, foreign matter or the like enters between the protective film and the polarizing plate, causing display defects and the like.

  Therefore, the present inventor has made extensive studies on the occurrence of floating, and the occurrence of floating is the position of the side edge of each member (polarizer, protective film, adhesive layer, protective layer) in the width direction of the optical film. I found that the relationship was greatly related.

  Then, the subject of this invention is providing the optical film which reduced generation | occurrence | production of the float, and its manufacturing method.

In order to solve the above problems, the optical film of the present invention is
An optical film having a polarizing plate and a protective film bonded to the surface of the polarizing plate,
The polarizing plate includes a polarizer and a protective film laminated on the polarizer,
The protect film includes an adhesive layer, and a protect layer laminated on the polarizing plate through the adhesive layer,
In the width direction of the optical film,
The side edge of the protective film is located outside the side edge of the polarizer,
The side edge of the protective layer is located outside the side edge of the polarizer,
The side edge of the protective layer is located at the same position as the side edge of the pressure-sensitive adhesive layer or located outside the side edge of the pressure-sensitive adhesive layer,
The side edge of the protective film is located outside the side edge of the adhesive layer,
Ratio L1 / the width dimension L1 between the side edge of the protective layer and the side edge of the pressure-sensitive adhesive layer and the width dimension L2 between the side edge of the protective film and the side edge of the pressure-sensitive adhesive layer L2 is 0 or more and 0.27 or less.

  According to the optical film of the present invention, in the width direction of the optical film, the side edge of the protect layer is located outside the side edge of the polarizer, and between the side edge of the protect layer and the side edge of the pressure-sensitive adhesive layer. The ratio L1 / L2 of the width dimension L1 and the width dimension L2 between the side edge of the protective film and the side edge of the pressure-sensitive adhesive layer is 0 or more and 0.27 or less. As a result, even if the protective film positioned outside the side edge of the polarizer is greatly deformed into a wave shape due to moisture absorption, the protective film positioned outside the side edge of the polarizer interferes with the protective layer. Therefore, the occurrence of floating between the adhesive layer of the protective film and the protective film of the polarizing plate can be reduced.

  Moreover, in one Embodiment of an optical film, the said optical film is formed in the sheet form.

  According to the embodiment, the optical film is formed in a sheet shape. Even in this case, the occurrence of floating between the pressure-sensitive adhesive layer of the protective film and the protective film of the polarizing plate can be reduced.

  Moreover, in one Embodiment of an optical film, the said optical film is wound by roll shape.

  According to the embodiment, the optical film is wound in a roll shape. Even in this case, the occurrence of floating between the pressure-sensitive adhesive layer of the protective film and the protective film of the polarizing plate can be reduced.

In one embodiment of the method for producing an optical film,
A method for producing an optical film having a polarizing plate and a protective film bonded to the surface of the polarizing plate,
The polarizing plate includes a polarizer and a protective film laminated on the polarizer,
The protect film includes an adhesive layer, and a protect layer laminated on the polarizing plate through the adhesive layer,
In the width direction of the optical film,
The side end of the protective film is located outside the side end of the polarizer,
The side edge of the protective layer is located outside the side edge of the polarizer,
The side edge of the protective layer is located at the same position as the side edge of the pressure-sensitive adhesive layer, or located outside the side edge of the pressure-sensitive adhesive layer,
The side end of the protective film is located outside the side end of the pressure-sensitive adhesive layer,
Ratio L1 / the width dimension L1 between the side edge of the protective layer and the side edge of the pressure-sensitive adhesive layer and the width dimension L2 between the side edge of the protective film and the side edge of the pressure-sensitive adhesive layer An optical film is manufactured by setting L2 to 0 or more and 0.27 or less.

  According to the optical film of the present invention and the method for producing the same, the side end of the protect layer is positioned outside the side end of the polarizer in the width direction of the optical film, and the side end of the protect layer and the side of the adhesive layer The ratio L1 / L2 between the width dimension L1 between the edges and the width dimension L2 between the side edge of the protective film and the side edge of the pressure-sensitive adhesive layer is 0 or more and 0.27 or less. Generation can be reduced.

It is a schematic cross section which shows the 1st reference form of the optical film of this invention. It is an expanded sectional view of the edge part of the width direction of an optical film. It is an expanded sectional view showing the 2nd reference form of the optical film of the present invention. It is an expanded sectional view showing the 3rd reference form of the optical film of the present invention. It is an expanded sectional view showing a 1st embodiment of an optical film of the present invention. It is an expanded sectional view which shows 2nd Embodiment of the optical film of this invention. It is an expanded sectional view showing a 3rd embodiment of an optical film of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First reference form)
FIG. 1 is a cross-sectional view showing a first reference embodiment of the optical film of the present invention. As shown in FIG. 1, the optical film 1 includes a polarizing plate 10 and a protective film 20 bonded to the surface of the polarizing plate 10.

  The polarizing plate 10 includes a polarizer 11, a protective film 12 laminated on one surface of the polarizer 11, and a retardation film 13 laminated on the other surface of the polarizer 11. The retardation film 13 may be omitted. The protect film 20 includes an adhesive layer 21 and a protect layer 22 laminated on the polarizing plate 10 via the adhesive layer 21.

  The polarizer 11 is made of, for example, a polyvinyl alcohol resin. The polyvinyl alcohol-based resin is usually obtained by saponifying a polyvinyl acetate-based resin. The saponification degree of the polyvinyl alcohol-based resin is usually 85 mol% or more, preferably 90 mol% or more, and more preferably 99 to 100 mol%. Polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith, such as ethylene-vinyl acetate copolymer. Examples include coalescence. In addition to the above ethylene, examples of other copolymerizable monomers include unsaturated carboxylic acids, olefins other than ethylene, vinyl ethers, and unsaturated sulfonic acids. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1000 to 10,000, preferably about 1500 to 5,000. The thickness of the polarizer 11 is usually about 1 to 60 μm, and preferably about 5 to 40 μm.

  The protective film 12 is made of, for example, triacetyl cellulose (TAC) or polyethylene terephthalate (PET). In addition, the protective film 12 may have an optical characteristic like a phase difference film, for example. The thickness of the protective film 12 is usually about 30 to 100 μm.

  The retardation film 13 is made of, for example, a cycloolefin polymer. The retardation film 13 may be omitted, or a protective film may be used instead of the retardation film 13. The thickness of the retardation film 13 is usually about 30 to 100 μm.

  The pressure-sensitive adhesive layer 21 is made of, for example, an acrylic pressure-sensitive adhesive. The adhesive force is, for example, 0.01 to 0.20 N / 25 mm. The thickness of the pressure-sensitive adhesive layer 21 is usually about 10 to 20 μm.

  The protect layer 22 is made of, for example, triacetyl cellulose (TAC) or polyethylene terephthalate (PET). Note that the protect layer 22 may have optical characteristics, such as a retardation film. The thickness of the protective layer 22 is usually about 30 to 50 μm.

  FIG. 2 is a cross-sectional view of the end portion of the optical film 1 in the width direction. As shown in FIG. 2, the side end 12 a of the protective film 12 is positioned outside the side end 11 a of the polarizer 11 in the width direction of the optical film 1. The side end 13 a of the retardation film 13 is located outside the side end 11 a of the polarizer 11. The side end 22 a of the protect layer 22 is located inside the side end 11 a of the polarizer 11. The side end 12a of the protective film 12 and the side end 13a of the retardation film 13 are at substantially the same position. The side end 22 a of the protect layer 22 is located inside the side end 12 a of the protective film 12.

  The side end 22 a of the protect layer 22 is located outside the side end 21 a of the pressure-sensitive adhesive layer 21. The side end 12 a of the protective film 12 is located outside the side end 21 a of the pressure-sensitive adhesive layer 21. The width dimension between the side end 22a of the protective layer 22 and the side end 21a of the adhesive layer 21 is L1. The width dimension between the side end 12a of the protective film 12 and the side end 21a of the adhesive layer 21 is set to L2. The width dimension between the side end 11a of the polarizer 11 and the side end 21a of the pressure-sensitive adhesive layer 21 is defined as W.

  Thus, the adhesive layer 21 does not exist in the protect layer 22 in the width dimension L1. In the width dimension L2, the protective film 12 does not have the pressure-sensitive adhesive layer 21.

  In the width dimensions L1 and L2, the side edge 22a of the protective layer 22 and the side edge 12a of the protective film 12 are positioned outside the side edge 21a of the pressure-sensitive adhesive layer 21 with reference to the side edge 21a of the pressure-sensitive adhesive layer 21. Let time be a positive number. On the other hand, when the side end 22a of the protective layer 22 and the side end 12a of the protective film 12 are located on the inner side of the side end 21a of the pressure-sensitive adhesive layer 21, a negative number is set. In order to suppress the contamination of the peripheral equipment and the optical film 1 due to the end portion exposure of the pressure-sensitive adhesive layer 21, the normal width dimension L1 is 0 or more. In order to protect the end portion of the polarizer 11, the side end 12 a of the normal protective film 12 is positioned outside the side end 11 a of the polarizer 11.

  In the width dimension W, the side edge 11a of the polarizer 11 is used as a reference, and when the side edge 21a of the pressure-sensitive adhesive layer 21 is located outside the side edge 11a of the polarizer 11, a positive number is set. On the other hand, when the side end 21a of the pressure-sensitive adhesive layer 21 is located on the inner side of the side end 11a of the polarizer 11, a negative number is set.

  In this reference form, L1 and L2 are positive numbers, and W is a negative number. When the absolute values of L1, L2, and W are compared, | L2 |> | W |> | L1 | is established. Usually, 0 <L1 ≦ 15 mm, 20 mm ≦ L2 ≦ 50 mm, and 0 <| W | <25 mm for the width of the optical film 1 of 1000 mm to 2500 mm.

  In the manufacturing method of the optical film 1, the side end 12 a of the protective film 12 is positioned outside the side end 11 a of the polarizer 11, and the side end 22 a of the protect layer 22 is positioned more than the side end 11 a of the polarizer 11. The optical film 1 is manufactured by being positioned inside.

  According to the optical film 1 and the manufacturing method thereof, the side end 22 a of the protect layer 22 is located inside the side end 11 a of the polarizer 11. Thereby, even if the protective film 12 positioned outside the side end 11a of the polarizer 11 is greatly deformed into a wave shape due to moisture absorption or the like, the protective film 12 positioned outside the side end 11a of the polarizer 11 is used. Is less likely to interfere with the protective layer 22 and can reduce the occurrence of floating between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10. And generation | occurrence | production of a float can be reduced even if the optical film 1 is formed in the sheet | seat shape, or it is wound by roll shape.

  In short, the inventors of the present application have inferred the mechanism of the occurrence of floating as follows. During the storage or processing of the optical film 1, the protective film 12 may absorb moisture and deform into a wave shape. At this time, in the protective film 12 overlapping with the polarizer 11, the polarizer 11 functions as an aggregate, so that the deformation of the protective film 12 does not occur or becomes small. On the other hand, in the protective film 12 positioned outside the side end 11a of the polarizer 11, the polarizer 11 serving as an aggregate does not exist, so that the deformation of the protective film 12 becomes large. As a result, the protection film 12 whose deformation has increased greatly interferes with the protection layer 22, and the protection layer 22 receives a force in a direction away from the protection film 12. As a result, the pressure-sensitive adhesive layer 21 is peeled off from the protective film 12, and floating occurs between the pressure-sensitive adhesive layer 21 and the protective film 12.

  Therefore, the inventor of the present application examines this mechanism, and positions the side end 22a of the protect layer 22 on the inner side of the side end 11a of the polarizer 11, so that the protection film 12 having a large deformation is protected. It was hard to interfere with.

(Second reference form)
FIG. 3 is a cross-sectional view showing a second reference embodiment of the optical film of the present invention. The second reference form is different from the first reference form in the positional relationship between the protective layer and the polarizer. This different configuration will be described below. In the second reference embodiment, the same reference numerals as those in the first reference embodiment are the same as those in the first reference embodiment, and thus the description thereof is omitted.

  As shown in FIG. 3, in the optical film 1 </ b> A, the side end 22 a of the protect layer 22 is at the same position as the side end 11 a of the polarizer 11. The positional relationship of other members is the same as in the first reference embodiment. In this reference form, L1 and L2 are positive numbers, and W is a negative number. | L2 |> | W | = | L1 | Usually, 0 <L1 ≦ 15 mm, 20 mm ≦ L2 ≦ 50 mm, and 0 <| W | <25 mm for the width of the optical film 1 of 1000 mm to 2500 mm.

  In the manufacturing method of the optical film 1A, the side end 12a of the protective film 12 is positioned outside the side end 11a of the polarizer 11, and the side end 22a of the protect layer 22 is the same as the side end 11a of the polarizer 11. The optical film 1 is manufactured in the position.

  According to the optical film 1 </ b> A and the manufacturing method thereof, the side end 22 a of the protect layer 22 is at the same position as the side end 11 a of the polarizer 11. Thereby, even if the protective film 12 positioned outside the side end 11a of the polarizer 11 is greatly deformed into a wave shape due to moisture absorption or the like, the protective film 12 positioned outside the side end 11a of the polarizer 11 is used. Is less likely to interfere with the protective layer 22 and can reduce the occurrence of floating between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10.

(3rd reference form)
FIG. 4 is a cross-sectional view showing a third reference embodiment of the optical film of the present invention. The third reference form is different from the first reference form in the positional relationship between the protect layer and the adhesive layer. This different configuration will be described below. Note that in the third reference embodiment, the same reference numerals as those in the first reference embodiment have the same configurations as those in the first reference embodiment, and thus the description thereof is omitted.

  As shown in FIG. 4, in the optical film 1 </ b> B, the side end 22 a of the protect layer 22 is in the same position as the side end 21 a of the pressure-sensitive adhesive layer 21. The positional relationship of other members is the same as in the first reference embodiment. In this reference form, L1 is 0, L2 is a positive number, and W is a negative number. | L2 |> | W | is satisfied. Usually, 20 mm ≦ L2 ≦ 50 mm and 0 <| W | <25 mm for the width of 1000 mm to 2500 mm of the optical film 1.

  According to the optical film 1B, as in the first reference embodiment, the side end 22a of the protect layer 22 is located inside the side end 11a of the polarizer 11, so that the adhesive layer 21 of the protect film 20 The occurrence of floating between the polarizing plate 10 and the protective film 12 can be reduced. Further, since the side end 22a of the protect layer 22 is at the same position as the side end 21a of the pressure-sensitive adhesive layer 21, the width dimension of the protect layer 22 can be reduced, and the material cost of the protect layer 22 can be reduced.

(First embodiment)
FIG. 5 is a cross-sectional view showing a first embodiment of the optical film of the present invention. The first embodiment is different from the first reference embodiment in the positional relationship between the protect layer, the pressure-sensitive adhesive layer, and the polarizer. This different configuration will be described below. In addition, in 1st Embodiment, since the code | symbol same as 1st reference form is the same structure as 1st reference form, the description is abbreviate | omitted.

  As shown in FIG. 5, in the optical film 1 </ b> C, the side end 22 a of the protect layer 22 is located outside the side end 11 a of the polarizer 11. The side end 21 a of the pressure-sensitive adhesive layer 21 is located outside the side end 11 a of the polarizer 11. The positional relationship of other members is the same as in the first reference embodiment. In this embodiment, L1, L2, and W are positive numbers. | L2 |> | W |> | L1 | is satisfied. The ratio L1 / L2 of the width dimension L1 to the width dimension L2 is 0 or more and 0.27 or less.

  In the manufacturing method of the optical film 1 </ b> C, the side end 12 a of the protective film 12 is positioned outside the side end 11 a of the polarizer 11, and the side end 22 a of the protect layer 22 is positioned more than the side end 11 a of the polarizer 11. Located on the outer side, the side end 22a of the protective layer 22 is positioned outside the side end 21a of the adhesive layer 21, and the side end 12a of the protective film 12 is positioned outside the side end 21a of the adhesive layer 21. The optical film 1C is manufactured by setting the ratio L1 / L2 between 0 and 0.27.

  According to the optical film 1C and the manufacturing method thereof, the side end 22a of the protective layer 22 is located outside the side end 11a of the polarizer 11, and the ratio L1 / L2 of the width dimension L1 to the width dimension L2 is 0. It is 0.27 or less, preferably 0.13 or less, more preferably 0.07 or less. Thereby, even if the protective film 12 positioned outside the side end 11a of the polarizer 11 is greatly deformed into a wave shape due to moisture absorption or the like, the protective film 12 positioned outside the side end 11a of the polarizer 11 is used. Is less likely to interfere with the protective layer 22 and can reduce the occurrence of floating between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10.

  In short, the inventor of the present application has studied the mechanism of the occurrence of floating described in the first reference embodiment, and the side end 22a of the protective layer 22 is located outside the side end 11a of the polarizer 11 and is greatly deformed. Even if the formed protective film 12 easily interferes with the protective layer 22, the ratio L1 / L2 of the width dimension L1 to the width dimension L2 is 0 or more and 0.27 or less, preferably 0.13 or less, more preferably 0. By setting the thickness to 0.07 or less, the protection film 12 whose deformation has increased is made difficult to interfere with the protection layer 22.

(Second Embodiment)
FIG. 6 is a cross-sectional view showing a second embodiment of the optical film of the present invention. The second embodiment is different from the first embodiment in the positional relationship between the protect layer and the pressure-sensitive adhesive layer. This different configuration will be described below. Note that in the second embodiment, the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 6, in the optical film 1 </ b> D, the side end 22 a of the protect layer 22 is in the same position as the side end 21 a of the pressure-sensitive adhesive layer 21. The positional relationship of other members is the same as in the first embodiment. In this embodiment, L1 is 0, L1 / L2 is 0, and L2 and W are positive numbers. | L2 |> | W | is satisfied.

  In the manufacturing method of the optical film 1D, the side end 12a of the protective film 12 is positioned outside the side end 11a of the polarizer 11, and the side end 22a of the protect layer 22 is positioned more than the side end 11a of the polarizer 11. Located on the outer side, the side end 22a of the protective layer 22 is positioned at the same position as the side end 21a of the adhesive layer 21, and the side end 12a of the protective film 12 is positioned outside the side end 21a of the adhesive layer 21. Thus, the optical film 1D is manufactured.

  According to the optical film 1D and the manufacturing method thereof, as in the first embodiment, the side end 22a of the protect layer 22 is positioned outside the side end 11a of the polarizer 11, and L1 / L2 is 0. Therefore, the occurrence of floating between the pressure-sensitive adhesive layer 21 of the protect film 20 and the protective film 12 of the polarizing plate 10 can be reduced. Further, since the side end 22a of the protect layer 22 is at the same position as the side end 21a of the pressure-sensitive adhesive layer 21, the width dimension of the protect layer 22 can be reduced, and the material cost of the protect layer 22 can be reduced.

(Third embodiment)
FIG. 7 is a cross-sectional view showing a third embodiment of the optical film of the present invention. The third embodiment differs from the first embodiment in the positional relationship between the polarizer and the pressure-sensitive adhesive layer. This different configuration will be described below. Note that in the third embodiment, the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 7, in the optical film 1 </ b> E, the side end 21 a of the pressure-sensitive adhesive layer 21 is positioned inside the side end 11 a of the polarizer 11. The positional relationship of other members is the same as in the first embodiment. In this embodiment, L1 and L2 are positive numbers, and W is a negative number. | L2 |> | L1 |> | W | L1 / L2 is 0 or more and 0.27 or less, preferably 0.13 or less, and more preferably 0.07 or less. Further, the third embodiment is a case where | W | is very large, usually | W |> 5, and preferably | W |> 10.

  According to the optical film 1E, as in the first embodiment, the side end 22a of the protect layer 22 is located outside the side end 11a of the polarizer 11, and L1 / L2 is 0 or more and 0.27. Since it is below, Preferably it is 0.13 or less, More preferably, it is 0.07 or less, Therefore Occurrence of the float between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10 can be reduced.

  The present invention is not limited to the above-described embodiment, and the design can be changed without departing from the gist of the present invention.

  In the first to second embodiments, preferably, the side end 22a of the protect layer 22 is in the same position as the side end 21a of the pressure-sensitive adhesive layer 21, and W is not less than −5 mm and not more than 5 mm. As a result, the width dimension of the protect layer 22 can be reduced, and the material cost of the protect layer 22 can be reduced.

Example 1
Next, examples of the first, second, and third reference modes will be described. In Table 1, when the side end 22a of the protect layer 22 is located at the same position as the side end 11a of the polarizer 11 or positioned inside the side end 11a of the polarizer 11, “L1”, “L2” , “L1 / L2”, “W”, and “occurrence of floating” are shown.

  The first example corresponds to the third reference form, the second to fourth examples correspond to the first reference form, and the fifth example corresponds to the second reference form.

  As shown in Table 1, as shown in the first to fifth embodiments, is the side end 22a of the protective layer 22 in the same position as the side end 11a of the polarizer 11 regardless of L1, L2, and W? When it was located inside the side end 11a of the polarizer 11, no floating occurred.

  Here, an evaluation method of “occurrence of floating” will be described. The term “floating” refers to a state where peeling of 1 cm or more occurs in the width direction. After sticking a protective film on the polarizing plate and winding it, cut it into a sheet of about 700mm in the MD direction and place it on a flat surface. After standing in a clean room (approximately 22 ° C 55%) for about 30 minutes, evaluate the floating state of the edge of the protective film. If even a small amount of tunneling occurs, it is determined as NG (the occurrence of floating).

(Example 2)
Next, examples of the first, second, and third embodiments will be described. Table 2 shows that “L1”, “L2”, “L1 / L2”, “W”, “floating” in a state where the side end 22a of the protect layer 22 is located outside the side end 11a of the polarizer 11. Results for "occurrence" are shown.

  The sixth example corresponds to the second embodiment, the seventh to tenth examples correspond to the first embodiment, and the eleventh example corresponds to the third embodiment.

  As shown in Table 2, when the side end 22a of the protect layer 22 is located outside the side end 11a of the polarizer 11, as shown in the sixth to eleventh embodiments, L1 / L2 is set to 0 or more. When it was 0.27 or less, no floating occurred. On the other hand, as shown in the first to twelfth comparative examples, when L1 / L2 was larger than 0.27, floating occurred.

DESCRIPTION OF SYMBOLS 1,1A-1E Optical film 10 Polarizing plate 11 Polarizer 11a Side end 12 Protection film 12a Side end 13 Phase difference film 13a Side end 20 Protection film 21 Adhesive layer 21a Side end 22 Protection layer 22a Side end L1 Protection layer side Width dimension between edge and side edge of pressure-sensitive adhesive layer L2 Width dimension between side edge of protective film and side edge of pressure-sensitive adhesive layer W Between side edge of polarizer and side edge of pressure-sensitive adhesive layer Width dimension

Claims (4)

An optical film having a polarizing plate and a protective film bonded to the surface of the polarizing plate,
The polarizing plate includes a polarizer and a protective film laminated on the polarizer,
The protect film includes an adhesive layer, and a protect layer laminated on the polarizing plate through the adhesive layer,
In the width direction of the optical film,
The side edge of the protective film is located outside the side edge of the polarizer,
The side edge of the protective layer is located outside the side edge of the polarizer,
The side edge of the protective layer is located at the same position as the side edge of the pressure-sensitive adhesive layer or located outside the side edge of the pressure-sensitive adhesive layer,
The side edge of the protective film is located outside the side edge of the adhesive layer,
Ratio L1 / the width dimension L1 between the side edge of the protective layer and the side edge of the pressure-sensitive adhesive layer and the width dimension L2 between the side edge of the protective film and the side edge of the pressure-sensitive adhesive layer L2 is an optical film which is 0 or more and 0.27 or less.   The optical film according to claim 1, wherein the optical film is formed in a sheet shape.   The optical film according to claim 1, wherein the optical film is wound in a roll shape. A method for producing an optical film having a polarizing plate and a protective film bonded to the surface of the polarizing plate,
The polarizing plate includes a polarizer and a protective film laminated on the polarizer,
The protect film includes an adhesive layer, and a protect layer laminated on the polarizing plate through the adhesive layer,
In the width direction of the optical film,
The side end of the protective film is located outside the side end of the polarizer,
The side edge of the protective layer is located outside the side edge of the polarizer,
The side edge of the protective layer is located at the same position as the side edge of the pressure-sensitive adhesive layer, or located outside the side edge of the pressure-sensitive adhesive layer,
The side end of the protective film is located outside the side end of the pressure-sensitive adhesive layer,
Ratio L1 / the width dimension L1 between the side edge of the protective layer and the side edge of the pressure-sensitive adhesive layer and the width dimension L2 between the side edge of the protective film and the side edge of the pressure-sensitive adhesive layer The manufacturing method of an optical film which manufactures an optical film as L2 being 0 or more and 0.27 or less.

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