KR102377352B1 - Method for manufacturing polarizing plate - Google Patents

Abstract

[Problem] The manufacturing method of the polarizing plate which can suppress the crack in the cutout of a polarizing plate is provided.
[Solutions] The manufacturing method of the polarizing plate 7 is a first laminate 107 including a film-type polarizer 8 and at least one optical film 3, 5, 9, 13 overlapping the polarizer 8 ), the process of manufacturing the second laminated body 7' in which the concave notch 7C' was formed by punching the 1st laminated body 107, and the notch 7C' and a process of reducing the radius of curvature (R _L ) of the corner portion ( _7CL ) by grinding the corner portion ( _7CL ) located inside the.

Description

The manufacturing method of a polarizing plate {METHOD FOR MANUFACTURING POLARIZING PLATE}

The present invention relates to a method for manufacturing a polarizing plate.

A polarizing plate is one of the optical components which comprise image display apparatuses, such as a liquid crystal television, an organic electroluminescent television, or a smart phone. A polarizing plate is equipped with the film-type polarizer and the optical film (for example, protective film) which overlaps with the polarizer. For design reasons of the image display device, there are cases where a cut-out portion is formed at the end of the polarizing plate. For example, Patent Document 1 below describes that a cutout is formed at an end of a polarizing plate as an injection port for liquid crystal.

Patent Document 1: Japanese Patent Laid-Open No. 2000-155325

As a result of research by the present inventors, it has been found that, when the cutout is formed in the polarizing plate by punching, cracks are likely to be formed in a corner located inside the cutout.

This invention was made in view of the said situation, and an object of this invention is to provide the manufacturing method of the polarizing plate which can suppress the crack in the cutout of a polarizing plate.

A method for manufacturing a polarizing plate according to an aspect of the present invention includes a step of manufacturing a first laminate including a film-type polarizer and at least one optical film overlapping the polarizer, and by punching the first laminate, a concave type A step of manufacturing the second laminate in which the cut-out portion is formed, and a step of reducing the radius of curvature of the corner portion by grinding the corner portion located inside the cut-out portion.

In one aspect of the present invention, before the corners are polished, the corners viewed from the lamination direction of the second laminate may be substantially curved, and the radius of curvature of the corners may be R _L , and after the corners are polished, the second laminate R _S may be sufficient as the radius of curvature of the corner part seen from the lamination direction of a sieve, and R _L may be larger than R _s .

In one aspect of the present invention, the corner portion may be polished by an endmill.

In one aspect of the present invention, the second laminate may have a first end that is not orthogonal to the absorption axis A of the polarizer, and a cutout portion may be formed at the first end. In other words, in the step of producing the second laminate, the angle θ between the first end and the absorption axis A of the polarizer may be adjusted to be 0° or more and less than 90°. Further, the second laminate may have a second end positioned opposite to the first end, and the cutout may extend from the first end toward the second end, and the cutout may extend in a direction (E) It may not be parallel to this absorption axis A. In other words, in the step of producing the second laminate, the angle α formed by the direction E in which the cutout extends with the absorption axis A of the polarizer may be adjusted to be greater than 0° and 90° or less. .

In one aspect of the present invention, the second laminate may have a first end and a second end positioned opposite the first end, and a cutout may be formed in the first end, and the cutout may be formed in the first end at the first end. It may extend toward the two ends, and the direction (E) in which a notch is extended does not need to be parallel to the absorption axis line (A) of a polarizer. In other words, in the step of producing the second laminate, the angle α formed by the direction E in which the cutout extends with the absorption axis A of the polarizer may be adjusted to be greater than 0° and 90° or less. .

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the polarizing plate which can suppress the crack in the cutout of a polarizing plate is provided.

1 is a schematic perspective view of a first laminate according to an embodiment of the present invention.
(a) of FIG. 2 is a plan view of the second laminate before being polished, and (b) of FIG. 2 is a modified example of the second laminate shown in (a) of FIG. 2 .
3 is an enlarged view of (a) of FIG. 2 .
FIG. 4 is an enlarged view of the second laminate shown in FIGS. 2A and 3 , and shows a cutout portion before being polished.
Fig. 5 is an enlarged view of a second laminate (polarizing plate), showing cutouts after being polished.
6 is a schematic perspective view of the second laminate (polarizing plate) shown in FIG. 5 .
7 is an enlarged view of a second laminate according to another embodiment of the present invention, showing a cutout portion before being polished.
Fig. 8 is an enlarged view of a second laminate (polarizing plate) according to another embodiment of the present invention, showing a cutout portion after being polished.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described, referring drawings. In the drawings, equal reference numerals are assigned to equal components. The present invention is not limited to the following embodiments. X, Y, and Z shown in each figure mean three mutually orthogonal coordinate axes. The direction indicated by each coordinate axis is common to all drawings.

In the manufacturing method of the polarizing plate which concerns on this embodiment, the process of producing the 1st laminated body containing the film-type polarizer and at least one optical film overlapping the polarizer, and punching of the 1st laminated body, The process (punching) of manufacturing the second laminate in which the ties are formed, and the process of reducing the radius of curvature of the corners located inside the notch by grinding the inside of the notch with a cutting/polishing tool (polishing) be prepared Punching may be alternatively referred to as blanking. The punching process may be, for example, a method in which the first laminate is sandwiched between a male die and a female die, and the second laminate is pulled out from the first laminate by pushing the male mold into the female die. Punching is, for example, a method in which the first laminate is sandwiched between a cutting die and a face plate, and the first laminate is pressed with the cutting die and the face plate, whereby the second laminate is taken out from the first laminate. is good too You may produce a 2nd laminated body from a 1st laminated body by combining punching processing and the cutting processing using a cutter or a laser. Hereinafter, each process (particularly a punching process and a grinding|polishing process) is demonstrated in detail. The cutting/polishing tool used for abrasive processing inside the cutout is, for example, at least one selected from the group consisting of a file, a tap, a grinder, a lute, and a milling cutter. 's tool is also good. A plurality of types of cutting/polishing tools may be used for polishing.

A 1st laminated body is produced by superposing|stacking a film-shaped polarizer and at least 1 optical film, and bonding these together. An optical film means the film-shaped member (polarizer itself is excluded.) which comprises a polarizing plate. The optical film may also be referred to as a layer or an optical layer. The optical film may be, for example, a protective film or a release film. A long strip|belt shape may be sufficient as each of a polarizer and an optical film, and a long strip|belt shape may also be sufficient as the 1st laminated body. The kind, number, and composition of the optical film which a 1st laminated body has are not limited. The laminated structure of the 1st laminated body is not limited, either.

For example, as shown in FIG. 1 , the first laminate 107 includes a film-type polarizer 8 and a plurality of optical films 3 , 5 , 9 , and 13 overlapping the polarizer 8 . Both the polarizer 8 and the plurality of optical films 3, 5, 9, 13 are quadrangular. The plurality of optical films 3 , 5 , 9 and 13 are a first protective film 5 , a second protective film 9 , a third protective film 3 , and a release film 13 (separator). That is, the first laminate 107 includes a polarizer 8 , a first protective film 5 , a second protective film 9 , a third protective film 3 , and a release film 13 . The first laminate 107 also includes an adhesive layer 11 positioned between the second protective film 9 and the release film 13 . The first protective film 5 is overlapped on one surface of the polarizer 8 , and the second protective film 9 is overlapped on the other surface of the polarizer 8 . That is, the protective film is closely_contact|adhered to both surfaces of the polarizer 8. As shown in FIG. The third protective film 3 is superimposed on the first protective film 5 . That is, the first protective film 5 is positioned between the polarizer 8 and the third protective film 3 . The release film 13 is superposed on the second protective film 9 through the adhesive layer 11 . In other words, the second protective film 9 is positioned between the polarizer 8 and the adhesive layer 11 .

By the punching process of the 1st laminated body 107, the 2nd laminated body 7' like that shown in FIG. 2 or FIG. 3 is produced. A plurality of second laminates 7 ′ may be produced from the first laminate 107 .

A concave cut-out portion 7C' is formed at an end portion (the first end portion 7e) of the second laminate 7'. This cut-out 7C' is the polarizer 8, the optical films 3, 5, 9, 13, and all of the adhesive layer 11 in the lamination direction (Z-axis direction) of the second laminate 7'. is penetrating That is, in the end face of the second laminate 7', a concave notch 7C' common to all of the polarizer 8, the optical films 3, 5, 9, 13, and the adhesive layer 11 is formed. is formed. The shape of the cut-out portion of the polarizer 8 viewed from the stacking direction (Z-axis direction) may be the same as or similar to the shape of the cut-out portion 7C' of the second laminate 7' viewed from the stacking direction. You may regard the shape of the cutout part 7C' of the 2nd laminated body 7' seen from the lamination direction as the shape of the cutout part of the polarizer 8 seen from the lamination direction. The cutout 7C' is rectangular. However, the shape of the notch 7C' is not limited to a rectangle.

As shown in FIG. 4 , a corner portion _7CL is positioned inside the cut-out portion 7C ′ in the stacking direction (Z-axis direction) of the second laminate 7 ′. Corner portion 7C _L is approximately curved. In other words, before the corner portion _7CL is polished with a cutting/polishing tool, the corner portion _7CL viewed from the stacking direction of the second laminate 7' is substantially curved. In a three-dimensional space, the corner part 7C _L located inside the cut-out part 7C' of the 2nd laminated body 7' is substantially curved. When the corner portion _7CL before being polished with a cutting/polishing tool is viewed from the stacking direction of the second laminate 7', the radius of curvature of the corner portion _{7CL is R L .} That is, when the corner portion 7CL viewed from the stacking direction of the second laminate 7' is approximated by an arc of a _large circle CL, the radius of curvature _{R L of} the corner portion _7CL is It is equal to the radius of the large circle C _L .

Following the punching process, the corner portion 7C _L located inside the cutout portion 7C' of the second laminate 7' is polished with a cutting/polishing tool. That is, following the punching processing, the corner portion 7C _L of the cut-out portion 7C' is polished with a cutting/polishing tool, thereby reducing the radius of curvature R _L of the corner portion 7C _L . As a cutting/polishing tool used for grinding|polishing of the corner part _7CL , an end mill which is a kind of milling cutter is preferable. By using the end mill, it is easy to grind the object in a straight or curved shape depending on the shape of the object to be polished. An end mill is a kind of milling cutter for cutting and grinding|polishing. The blade of the end mill is located on the side of the end mill approximately parallel to the axis of rotation of the end mill. By rotation of the end mill, the surface of the workpiece (workpiece) to which the blade of the end mill is pressed is cut and polished. By cutting and grinding the corner part 7C _{L of the cut-out part 7C' with an end mill, the corner part 7C L is} finished smoothly. You may grind the whole inner side of the cutout part 7C' including the corner part 7C _L with an end mill. In addition to the inner side (corner portion 7C _L ) of the cut-out portion 7C', the end (end surface) of the second laminate 7' located outside the cut-out portion 7C' may be polished with an end mill good night. Part or all of the end (outer edge) of the second laminate 7' may be polished with an end mill.

Below, the 2nd laminated body before grinding|polishing may be described as "2nd laminated body 7'." The 2nd laminated body after grinding|polishing may be described as "the 2nd laminated body 7". In addition, the notch part of the 2nd laminated body 7' before grinding|polishing may be described as "notch part 7C'." The notch part of the 2nd laminated body 7 after grinding|polishing may be described as "notch part 7C."

As shown in FIG. 5 , when the corner portion _7CS after being polished with a cutting/polishing tool is viewed from the stacking direction of the second laminate 7 , the radius of curvature of the corner portion _7CS is _RS . That is, when the corner portion 7CS as seen in the stacking direction of the second laminate 7 is approximated by an arc of a _small circle _CS , the radius of curvature RS of the corner portion _7CS is that of the _small circle _CS . equal to the radius As shown in FIGS. 4 and 5 , the radius of curvature R _L of the corner portion 7C _L before being polished with a cutting/polishing tool is the curvature of the corner portion 7C _S after being polished with a cutting/polishing tool. greater than the radius R _S .

The completed polarizing plate may be sufficient as the 2nd laminated body 7 (2nd laminated body 7 shown in FIG. 6) which passed the grinding|polishing of the corner part _7CL with a cutting/polishing tool.

In this embodiment, the corner part 7CS of 7 _C of cutouts is chamfered by a punching process and the grinding|polishing process following it, and the surface of the corner part _7CS is made smooth. As a result, cracks are suppressed in 7C of cutouts (particularly, corner part 7C _S ). The larger the radius of curvature RS of the polished corner portion _7CS is, the easier it is to suppress cracks in the cutout portion 7C (especially the corner portion _{7CS )} of the completed polarizing plate.

For example, if the radius of curvature of the corner portion 7C _L of the cut-out portion 7C' is adjusted to a _small value RS by only one punching process, in the process of punching, the corner of the cut-out portion 7C' Stress tends to concentrate on the portion 7C _L . As a result, with the punching process, many large cracks are easy to form in the notch 7C' (particularly, the corner part _7CL ). After a number of large cracks are formed in the cut-out portion 7C' (corner portion 7C _L ) by punching, the inner side (corner portion 7C _L ) of the cut-out portion 7C' is cut with a cutting/polishing tool. Even if it grind|polishes, a crack may remain.

On the other hand, in this embodiment, the radius of curvature of the corner part 7CL of the notch part 7C' is adjusted to the comparatively large value _{R L} (a value larger than RS ₎ at the time of a punching process. And, the radius of curvature _{R L} of the corner part 7C _L of the cut-out part 7C' is reduced to RS by the grinding|polishing process subsequent to a punching process. That is, the radius of curvature R _L of the corner portion 7C _L of the cut-out portion 7C' is reduced stepwise (gradually) by the two steps of the punching processing and the polishing processing. As a result, compared to the case where the radius of curvature of the corner portion 7C _L is adjusted to a _small value RS by only one punching process, the cut-out portion 7C' accompanying the punching processing (especially the corner portion 7C) Cracks in _L )) are suppressed. The larger the radius of curvature R _L of the corner portion 7C _L to be adjusted in the punching processing, the easier it is to suppress cracks in the cutout portion 7C' (particularly the corner portion _7CL ) accompanying the punching processing. The larger the radius of curvature R _L of the corner portion 7C _L adjusted in the punching processing, the larger the cracks formed in the cutout portion 7C' (particularly the corner portion 7C _L ) accompanying the punching processing are cut and polished. It is easy to remove by grinding using a tool (especially an end mill).

The shape of the notch 7C' formed by the punching process corresponds to the shape of the punch or the cutting die used for the punching process. The radius of curvature _{R L of} the corner portion 7CL before polishing may be freely controlled by adjusting the shape of the punch or the cutting die. The radius of curvature RS of the corner part _7CS of the cutout part _7C after grinding|polishing may be freely controlled by adjustment of the movement path|route of a cutting/polishing tool. When using an end mill as a cutting/polishing tool, the radius of curvature _RS of the corner part _7CS after grinding|polishing may be freely controlled by adjustment of the thickness of an end mill. For example, the lower limit of the _radius of curvature RS may be about 1/2 of the thickness (diameter) of the end mill. The radius of curvature RS of the corner portion _7CS after grinding may be freely controlled by adjusting the size of the _blade of the end mill.

The radius of curvature R _L of the corner portion 7C _L before being polished with a cutting/polishing tool may be, for example, 2.3 to 20 mm. The radius of curvature _RS of the corner portion _7CS after being polished with a cutting/polishing tool may be, for example, 2.0 to 10 mm. R _L /R _S may be, for example, 1.2 to 2.0. When each of R _L , R _S , and R _L /R _S is within the above range, cracks in the cutout portion 7C (particularly the corner portion 7C _S ) that have been polished with a cutting/polishing tool are likely to be suppressed. .

The length of the crack that can be formed in the cutout portion 7C' (particularly the corner portion _7CL ) accompanying the punching process may be, for example, on the order of 300 to 600 mu m. The width of the portion cut off from the corner portion _7CL of the second laminate 7' by a cutting/polishing tool may be, for example, 300 to 500 µm.

By punching the first laminate 107, a second laminate 7' having a first end 7e that is not orthogonal to the absorption axis A of the polarizer 8 may be produced, and the cutout portion (7C') may be formed in the 1st end part 7e. As shown in Fig. 2 (a), Fig. 2 (b) or Fig. 3 , the reference line L has a pair of leg portions 7C1 and When defined as a straight line connecting 7C2 ), the reference line L may not be perpendicular to the absorption axis A of the polarizer 8 . In other words, the angle θ between the reference line L of the cutout 7C′ and the absorption axis A of the polarizer 8 may be 0° or more and less than 90°. In other words, the reference line L may be referred to as a straight line connecting the pair of leg portions 7C1 and 7C2 in a direction perpendicular to the stacking direction (Z-axis direction) of the second stacked body 7'.

The absorption axis line A may be changed to be, for example, a straight line substantially parallel to the orientation direction of the polyvinyl alcohol (PVA) molecules in the polarizer 8 . The absorption axis line A may be, for example, a straight line substantially parallel to the orientation direction of the dye molecules (eg, polyiodine or organic dye) adsorbed to polyvinyl alcohol in the polarizer 8 . It can be said that many carbon atoms constituting one PVA molecule are mutually bonded by a covalent bond (C-C bond) along the absorption axis (A). On the other hand, in the direction substantially perpendicular to the absorption axis A, PVA molecules are bonded to each other by crosslinking via a crosslinking agent (eg, boric acid). In other words, in the direction substantially perpendicular to the absorption axis (A), the hydroxyl groups of each PVA molecule form a hydrogen bond or an oxygen-boron bond (OB bond) with boric acid located between the PVA molecules, thereby crosslinking between PVA molecules. has been The C-C bond formed along the absorption axis (A) is stronger than the cross-linked bond formed along the direction substantially perpendicular to the absorption axis (A). Accordingly, the mechanical strength of the polarizer 8 in a direction substantially parallel to the absorption axis A is higher than the mechanical strength of the polarizer 8 in a direction substantially perpendicular to the absorption axis A. In other words, the thermal contraction of the polarizer 8 in the direction substantially parallel to the absorption axis A is less likely to cause cracks than the thermal contraction of the polarizer 8 in the direction approximately perpendicular to the absorption axis A .

For example, when the reference line (L) is perpendicular to the absorption axis (A) (when the angle (θ) is 90°), in the direction parallel to the reference line (L), weaker crosslinks are formed compared to the CC bonds in the PVA molecule, there is. Therefore, when the reference line L is orthogonal to the absorption axis A, the deep portion 7Cd (inner portion) of the cut-out portion 7C' contracts in a direction substantially parallel to the reference line L, Cracks are likely to form in the deep portion of the cut-out portion 7C'.

On the other hand, when the reference line L is not orthogonal to the absorption axis A of the polarizer 8 (that is, when the angle θ is 0° or more and less than 90°), stronger than the cross-linking between PVA molecules CC bonding in the PVA molecule raises the mechanical strength of the polarizer 8 in the direction parallel to the reference line L. As a result, even if the deep part 7Cd of the cut-out part 7C' shrinks in the direction substantially parallel to the reference line L, it is hard to form a crack in the cut-out part 7C'. In particular, when the reference line L is parallel to the absorption axis A (when the angle θ is 0°), the CC bonds in most of the PVA molecules constituting the polarizer 8 follow the absorption axis A is formed Therefore, when the reference line L is parallel to the absorption axis A, the mechanical strength of the polarizer 8 in the direction parallel to the reference line L is remarkably high, and cracks in the cutout 7C' formation is significantly inhibited. However, even when the reference line L is orthogonal to the absorption axis A of the polarizer 8, the effect of the present invention is exhibited.

The smaller the angle θ between the reference line L and the absorption axis A is, the more difficult it is to form cracks in the cutout 7C'. The angle θ may be 0° or more and 75° or less, or 0° or more and 60° or less.

As shown in Fig. 2(a), Fig. 2(b) or Fig. 3 , the second laminate 7' obtained by the punching process has a first end portion 7e in which a cutout portion 7C' is formed. ) and a second end portion 17e positioned opposite to the first end portion 7e. In the punching process, the notch 7C' may be extended from the first end portion 7e toward the second end portion 17e. In addition, you may adjust the direction E in which the notch 7C' extends to the direction which is not parallel to the absorption axis line A of the polarizer 8. In other words, the angle α formed by the direction E in which the cutout 7C′ extends with the absorption axis A may be greater than 0° and not greater than 90°. The direction E in which the cutout 7C' extends may be the same as the longitudinal direction of the cutout 7C'. That is, the longitudinal direction of the notch 7C' may follow the direction E in which the notch 7C' extends. Both the first end 7e and the second end 17e may be straight, and the first end 7e may be parallel to the second end 17e.

When the direction E in which the cutout 7C' extends is not parallel to the absorption axis A of the polarizer 8, the CC bond in the PVA molecule, which is stronger than the cross-linkage between the PVA molecules, is in the direction E ) to increase the mechanical strength of the polarizer 8 in a direction perpendicular to it. As a result, even if the deep portion 7Cd of the cut-out portion 7C' contracts in a direction substantially perpendicular to the direction E, cracks are hardly formed in the cut-out portion 7C'. The larger the angle α between the direction E and the absorption axis A is, the more difficult it is to form cracks in the cutout 7C′. In particular, when the direction E is perpendicular to the absorption axis A (when the angle α is 90°), the CC bonds in most of the PVA molecules constituting the polarizer 8 are perpendicular to the direction E. is formed with Therefore, when the direction E is perpendicular to the absorption axis A, the mechanical strength of the polarizer 8 in the direction perpendicular to the direction E is remarkably high, and cracks in the cutout 7C' formation is significantly inhibited. However, even when the direction E in which the cutout 7C' extends is parallel to the absorption axis A of the polarizer 8, the effect of the present invention is exhibited.

The width Wc of the notch 7C in the direction parallel to the reference line L may be, for example, 2 mm or more and less than 600 mm, or 5 mm or more and 30 mm or less. The width Wc may be changed to the width of the cut-out portion 7C in a direction parallel to the end portion (the first end portion 7e) of the second laminate 7 . The width W'c of the cut-out portion 7C' may be widened along with the abrasive processing by a cutting/polishing tool. That is, the width Wc of the notch 7C after grinding may be larger than the width W'c of the notch 7C' before grinding. The width W of the whole 2nd laminated body 7 in the direction parallel to the reference line L may be 30 mm or more and 600 mm or less, for example. The width W of the whole 2nd laminated body 7 may be changed to the width|variety of the 2nd laminated body 7 whole in the direction parallel to the reference line L. The width W of the whole 2nd laminated body 7 may become narrow with the grinding|polishing by a cutting/polishing tool. The width W of the whole 2nd laminated body 7 may be replaced with the width|variety of the whole polarizing plate (the 2nd laminated body 7 whole after grinding|polishing process). The width Wc of the notch 7C should just be less than the width W of the whole 2nd laminated body 7 . When the width Wc of the cut-out portion 7C is 5 mm or more and 30 mm or less, the overall width W of the second laminate 7 (the overall width of the polarizing plate) is greater than 20 mm and 160 mm or less, preferably greater than 25 mm. Larger than 130 mm, more preferably larger than 30 mm and no greater than 100 mm, still more preferably larger than 30 mm and no greater than 70 mm (provided that Wc<W). The ratio (Wc/W) of the width Wc of the cut-out portion 7C and the width W of the entire second laminate 7 is 0.05 or more and less than 1.0, 0.08 or more and less than 1.0, 0.10 or more and less than 1.0, or 0.13 or more and less than 1.0, preferably preferably 0.15 or more and less than 1.0, or 0.17 or more and less than 1.0, more preferably 0.20 or more and less than 1.0, or 0.22 or more and less than 1.0, still more preferably 0.30 or more and less than 1.0, 0.33 or more and less than 1.0, or 0.40 or more and less than 1.0. Ratio (Wc/W) may be 0.05 or more and 0.90 or less, 0.05 or more and 0.80 or less, 0.05 or more and 0.78 or less, 0.05 or more and 0.45 or less, or 0.40 or more and 0.80 or less. In other words, Wc/W may be said to be the ratio of the width Wc of the cut-out portion 7C to the width W of the entire first end portion 7e. When Wc/W exists in the above-mentioned range, the crack in 7C of cutouts is easy to suppress. The reason for this is as follows. As the width Wc of the cut-out portion 7C is smaller than the overall width W of the second laminate 7, the width Wc of the cut-out portion 7C is reduced by the shrinkage of the entire second laminate 7 according to the temperature change. It is easy to generate|occur|produce a spreading force, and it is easy to generate|occur|produce a crack in 7 C of cutouts. That is, cracks are more likely to occur in the cut-out portion 7C, so that Wc/W is smaller. On the other hand, as Wc/W is large (the overall width W of the second laminate 7 is small), the amount of shrinkage of the entire second laminate 7 due to a change in temperature is reduced. That is, the absolute value of the change amount of the width W of the whole 2nd laminated body 7 reduces, so that the width W of the whole 2nd laminated body 7 is small. By reducing the amount of shrinkage of the whole 2nd laminated body 7 by temperature change, it is hard to produce the force which widens the width Wc of 7 C of cutouts, and the crack in 7C of cutouts is easy to be suppressed. However, even when Wc/W is outside the above numerical range, it is possible to suppress cracks in the cut-out portion 7C.

The length (depth) Dc of the notch 7C in the direction perpendicular to the reference line L may be, for example, 1 mm or more and 30 mm or less. The length Dc may be changed to be the depth of the cut-out portion 7C in the direction perpendicular to the reference line L. The length D'c of the cut-out part 7C' may be extended with the grinding|polishing by a cutting/polishing tool. That is, the length Dc of the notch 7C after grinding|polishing may be longer than the length D'c of the notch 7C' after grinding|polishing. The total length D of the second laminate 7 in the direction perpendicular to the reference line L may be, for example, 30 mm or more and 600 mm or less. The length D of the whole 2nd laminated body 7 may become narrow accompanying the grinding|polishing by a cutting/polishing tool. The length D of the whole 2nd laminated body 7 may be changed to the length of the whole polarizing plate (2nd laminated body 7 whole after grinding|polishing process) in the direction perpendicular|vertical to the reference line L. The thickness of the second laminate 7 may be, for example, 10 µm or more and 1200 µm or less, 10 µm or more and 500 µm or less, 10 µm or more and 300 µm or less, or 10 µm or more and 200 µm or less. The thickness of the 2nd laminated body 7 may be the same as the thickness of the whole polarizing plate (2nd laminated body 7 whole after grinding|polishing process). The width Wc of the cut-out portion 7C may be larger than the length Dc of the cut-out portion 7C. The width Wc of the cut-out portion 7C may be smaller than the length Dc of the cut-out portion 7C. The width Wc of the cut-out portion 7C may be equal to the length Dc of the cut-out portion 7C.

The detail of the manufacturing method of the 1st laminated body before a punching process may be as follows.

You may produce a laminated body (1st laminated body) by bonding together the elongate strip|belt-shaped polarizer film and the elongate strip|belt-shaped some optical film. A long strip|belt-shaped polarizer film is the polarizer 8 before a process and shaping|molding. The absorption axis of the polarizer film may be the same as the absorption axis A of the polarizer 8 after processing and molding. The plurality of elongated strip-shaped optical films are optical films 3, 5, 9, and 13 before processing and molding.

The direction of the absorption axis A of the polarizer 8 included in the second laminate 7' has already been grasped at a point in time before the punching process. Therefore, by adjusting the punching direction of the 1st laminated body 107, you may adjust the angle (theta) to 0 degrees or more and less than 90 degrees. Further, when forming the cut-out 7C' at the first end 7e of the second laminate 7', by adjusting the direction of the cut-out 7C', the angle α is made greater than 0° and 90 ° or less may be controlled. The direction itself of the absorption axis line A in the polarizer film (polarizer 8) may be adjusted and controlled by the extending|stretching direction and a draw ratio of the PVA film performed before a punching process.

The polarizer 8 may be a film-type polyvinyl alcohol-based resin (PVA film) produced by processes such as stretching, dyeing and crosslinking. The details of the polarizer 8 are as follows.

For example, first, a PVA film is stretched in a uniaxial direction or a biaxial direction. The dichroic ratio of the polarizer 8 stretched in the uniaxial direction tends to be high. Following stretching, using a dyeing solution, the PVA film is dyed with iodine, a dichroic dye (polyiodine) or an organic dye. The dyeing solution may contain boric acid, zinc sulfate or zinc chloride. The PVA film may be washed with water before dyeing. By washing with water, dirt and antiblocking agent are removed from the surface of the PVA film. Moreover, as a result of which a PVA film swells by water washing, it is easy to suppress the unevenness of dyeing (non-uniform dyeing|dyeing). The PVA film after dyeing is treated with a solution of a crosslinking agent (eg, aqueous solution of boric acid) for crosslinking. After treatment with a crosslinking agent, the PVA film is washed with water and then dried. The polarizer 8 can be obtained through the above procedure. Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate-type resin. The polyvinyl acetate-based resin may be, for example, polyvinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and other monomers (eg, ethylene-vinyl acetate copolymer). The other monomer copolymerized with vinyl acetate may be, other than ethylene, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides having an ammonium group. The polyvinyl alcohol-based resin may be modified with aldehydes. The modified polyvinyl alcohol-based resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal or polyvinyl butyral. The polyvinyl alcohol-type resin may be a polyene-based oriented film such as a dehydration treatment product of polyvinyl alcohol or a dehydrochloric acid treatment product of polyvinyl chloride. You may dye|stain before extending|stretching, and you may extend|stretch in a dyeing solution. The length of the extended polarizer 8 may be 3 to 7 times the length before extending|stretching, for example.

The thickness of the polarizer 8 may be, for example, 1 µm or more and 50 µm or less, 1 µm or more and 10 µm or less, 1 µm or more and 8 µm or less, 1 µm or more and 7 µm or less, or 4 µm or more and 30 µm or less. As the polarizer 8 is thinner, the shrinkage of the polarizer 8 itself according to the temperature change is suppressed, and the change in the dimension of the polarizer 8 itself is suppressed. As a result, stress hardly acts on the polarizer 8, and cracks in the polarizer 8 are easily suppressed.

The first protective film 5 and the second protective film 9 may be formed of a translucent thermoplastic resin, and may be an optically transparent thermoplastic resin. The resin constituting the first protective film 5 and the second protective film 9 is, for example, a chain polyolefin-based resin, a cyclic olefin polymer-based resin (COP-based resin), a cellulose ester-based resin, a polyester-based resin, or a polycarbonate. Resin, (meth)acrylic resin, polystyrene resin, or a mixture or copolymer thereof may be used. The composition of the first protective film 5 may be completely the same as that of the second protective film 9 . The composition of the first protective film 5 may be different from the composition of the second protective film 9 .

The chain polyolefin resin may be, for example, a homopolymer of a chain olefin such as a polyethylene resin or a polypropylene resin. The chain polyolefin resin may be a copolymer composed of two or more chain olefins.

The cyclic olefin polymer resin (cyclic polyolefin resin) may be, for example, a ring-opened (co)polymer of a cyclic olefin or an addition polymer of a cyclic olefin. The cyclic olefin polymer resin may be, for example, a copolymer of a cyclic olefin and a chain olefin (eg, a random copolymer). The chain olefin constituting the copolymer may be, for example, ethylene or propylene. The cyclic olefin polymer-type resin may be the graft polymer which modified|denatured the said polymer with unsaturated carboxylic acid or its derivative(s), or these hydrides may be sufficient as it. The cyclic olefin polymer resin may be, for example, a norbornene-based resin using a norbornene-based monomer such as norbornene or a polycyclic norbornene-based monomer.

Cellulose ester resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate or cellulose dipropionate. You may use these copolymers. A cellulose ester-based resin in which a part of the hydroxyl group is modified with another substituent may be used.

You may use polyester-type resin other than a cellulose-ester-type resin. The polyester-based resin may be, for example, a polycondensate of a polyhydric carboxylic acid or a derivative thereof and a polyhydric alcohol. Dicarboxylic acid or its derivative(s) may be sufficient as polyhydric carboxylic acid or its derivative(s). The polyhydric carboxylic acid or its derivative may be, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate or dimethyl naphthalenedicarboxylic acid. The polyhydric alcohol may be, for example, a diol. The polyhydric alcohol may be, for example, ethylene glycol, propanediol, butanediol, neopentyl glycol or cyclohexanedimethanol.

The polyester-based resin is, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate or polycyclohexanedimethyl or A phthalate may be sufficient.

The polycarbonate-based resin is a polymer in which a polymerization unit (monomer) is bonded through a carbonate group. The polycarbonate-based resin may be a modified polycarbonate having a modified polymer skeleton, or may be a copolymerized polycarbonate.

The (meth)acrylic resin includes, for example, poly(meth)acrylic acid ester (eg, polymethyl methacrylate (PMMA)); methyl methacrylate-(meth)acrylic acid copolymer; methyl methacrylate-(meth)acrylic acid ester copolymer; methyl methacrylate-acrylic acid ester-(meth)acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (eg MS resin); A copolymer of methyl methacrylate and a compound having an alicyclic hydrocarbon group (eg, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-(meth) acrylate norbornyl copolymer, etc.) may be used.

At least one optical film of a pair of optical films (1st protective film 5 and 2nd protective film 9) with polarizer 8 interposed therebetween may contain triacetyl cellulose (TAC). At least one optical film of a pair of optical films (1st protective film 5 and 2nd protective film 9) sandwiching the polarizer 8 contains a cyclic olefin polymer-type resin (COP-type resin), also good At least one optical film among a pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 8 interposed therebetween may contain polymethyl methacrylate (PMMA). . Both of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 8 interposed therebetween may contain triacetyl cellulose. One of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 8 sandwiched therebetween contains triacetyl cellulose, and the polarizer 8 is sandwiched therebetween. The other film among a pair of optical films may contain a cyclic olefin polymer. One of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 8 sandwiched therebetween contains triacetyl cellulose, and the polarizer 8 is sandwiched therebetween. Among the pair of optical films, the other film may contain polymethyl methacrylate. One film of a pair of optical films (1st protective film 5 and 2nd protective film 9) which sandwiched the polarizer 8 contains cyclic olefin polymer resin, and the polarizer 8 is interposed Among the pair of optical films placed in , the other film may contain polymethyl methacrylate. When the polarizer 8 is sandwiched between a pair of optical films (the first protective film 5 and the second protective film 9), the optical film (protective film) is in close contact with the polarizer 8 and is resistant to temperature changes. In order to suppress the expansion or contraction of the polarizer 8 which followed, it is hard to produce the crack in the polarizer 8. For example, when the polarizer 8 is pinched|interposed with the 1st protective film 5 which consists of TAC, and the 2nd protective film 9 which consists of COP-type resin, it is hard to produce the crack in the polarizer 8.

The first protective film 5 or the second protective film 9 includes at least one additive selected from the group consisting of lubricants, plasticizers, dispersants, heat stabilizers, ultraviolet absorbers, infrared absorbers, antistatic agents and antioxidants. also good

The thickness of the 1st protective film 5 may be 5 micrometers or more and 90 micrometers or less, 5 micrometers or more and 80 micrometers or less, or 5 micrometers or more and 50 micrometers or less may be sufficient, for example. The thickness of the second protective film 9 may also be, for example, 5 µm or more and 90 µm or less, 5 µm or more and 80 µm or less, or 5 µm or more and 50 µm or less.

The first protective film 5 or the second protective film 9 may be a film having an optical function, such as a retardation film or a brightness improving film. For example, the retardation film to which arbitrary retardation values were provided can be obtained by extending|stretching the film which consists of the said thermoplastic resin, or forming a liquid crystal layer etc. on the said film.

The first protective film 5 may be bonded to the polarizer 8 via an adhesive layer. The second protective film 9 may also be bonded to the polarizer 8 via an adhesive layer. The adhesive layer may contain aqueous adhesives, such as polyvinyl alcohol, and may contain the active energy ray-curable resin mentioned later.

Active energy ray-curable resin is resin hardened|cured by irradiating an active energy ray. The active energy rays may be, for example, ultraviolet rays, visible light, electron beams, or X-rays. The active energy ray-curable resin may be an ultraviolet-curable resin.

One type of resin may be sufficient as active energy ray-curable resin, and multiple types of resin may be included. For example, active energy ray-curable resin may contain a cationically polymerizable sclerosing|hardenable compound or radically polymerizable sclerosing|hardenable compound. Active energy ray-curable resin may contain the cationic polymerization initiator or radical polymerization initiator for starting the hardening reaction of the said sclerosing|hardenable compound.

The cationically polymerizable curable compound may be, for example, an epoxy compound (a compound having at least one epoxy group in its molecule) or an oxetane compound (a compound having at least one oxetane ring in its molecule). The radically polymerizable sclerosing compound may be, for example, a (meth)acrylic compound (a compound having at least one (meth)acryloyloxy group in its molecule). The radically polymerizable sclerosing|hardenable compound may be a vinyl-type compound which has a radically polymerizable double bond.

The active energy ray-curable resin may contain, if necessary, a cationic polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, an antifoaming agent, an antistatic agent, a leveling agent or a solvent. may be included.

The pressure-sensitive adhesive layer 11 may contain, for example, a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, or a urethane pressure-sensitive adhesive. The thickness of the adhesive layer 11 may be, for example, 2 µm or more and 500 µm or less, 2 µm or more and 200 µm or less, or 2 µm or more and 50 µm or less.

The resin constituting the third protective film 3 may be the same as the above-mentioned resins listed as the resin constituting the first protective film 5 or the second protective film 9 . The thickness of the 3rd protective film 3 may be 5 micrometers or more and 200 micrometers or less, for example.

The resin constituting the release film 13 may be the same as the resins listed above as the resin constituting the first protective film 5 or the second protective film 9 . The thickness of the release film 13 may be, for example, 5 µm or more and 200 µm or less.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.

For example, you may form the some notch part in the 2nd laminated body by the punching process of a 1st laminated body. You may reduce the curvature radius R _L of the corner part located inside some cutouts among several cutouts by grinding|polishing. You may reduce the curvature radius R _L of the corner part located inside all the cutouts among a plurality of cutouts by grinding|polishing. There may be one corner part inside one cut-out part. A plurality of corner portions may exist inside one cutout. You may reduce the curvature radius R _L of some corner part among several corner part by grinding|polishing. You may reduce all the radius of curvature R _L of some corner part by grinding|polishing.

The shape of each of a polarizing plate and a cutout may be various according to a use. For example, as shown in FIG. 7, the shape of the cut-out part 7C' before grinding|polishing may be substantially triangular. As shown in Fig. 8, the shape of the cut-out portion 7C after polishing may also be substantially triangular. The shape of the cutouts 7C' and 7C as a whole may be semicircular or arcuate. The shape of the cutouts 7C' and 7C is not limited to a quadrangle or a triangle, and other polygons may be used. The deep part of the cutouts 7C' and 7C may branch into a plurality of branches.

The entire outer edge of the second laminates 7' and 7 may be a polygon other than a quadrangle. A closed curve may be sufficient as the whole outer edge of the 2nd laminated body 7', 7. For example, the entire outer edge of the second laminates 7' and 7 may be circular or elliptical. A part of the outer edge of the 2nd laminated body 7', 7 may be linear, and the remainder of the outer edge of the 2nd laminated body 7', 7 may be curved. The shape of the outer edge of the completed polarizing plate may be substantially the same as the shape of the outer edge of the 2nd laminated body 7', 7 .

The first end 7e at which the cutout 7C' is formed may not be parallel to the second end 17e. When the first end 7e is not parallel to the second end 17e and the core 7Cd (bottom) of the cut-out 7C is straight, "the direction E in which the cut-out 7C' extends )" may be parallel to a straight line that bisects the line segment connecting the pair of leg portions 7C1 and 7C2 and bisects the deep portion 7Cd of the cut-out portion 7C'. When the first end 7e is not parallel to the second end 17e and the core 7Cd of the cutout 7C is curved, the “direction E in which the cutout 7C extends” is It may be parallel to the straight line which connects the midpoint of the line segment which connects the deep part 7Cd (the deepest part) of the connection part 7C and each part 7C1, 7C2.

The type, number, and lamination order of the optical films constituting the second laminates 7' and 7 or the polarizing plate are not limited. The optical film may be a reflective polarizing film, a film with an anti-glare function, a film with a surface anti-reflection function, a reflective film, a transflective film, a viewing angle compensation film, an optical compensation layer, a touch sensor layer, an antistatic layer or an antifouling layer. . The second laminate 7', 7 or the polarizing plate may further include a hard coat layer.

[Example]

Hereinafter, the present invention will be described in more detail by way of Examples, but the present invention is not limited to these Examples.

(Example 1)

The rectangular 1st laminated body 107 comprised with the polarizer film (polarizer 8 before cutting), the optical films 3, 5, 9, 13 of 4 sheets, and the pressure-sensitive adhesive layer 11 was produced. The first laminate 107 includes a release film 13 , an adhesive layer 11 overlapping the release film 13 , a second protective film 9 overlapping the adhesive layer 11 , and a second protective film The polarizer film 8 which overlaps with (9), the 1st protective film 5 which overlaps with the polarizer film 8, and the 3rd protective film 3 which overlaps with the 1st protective film 5 were provided. As the polarizer film 8, stretched and dyed film-type polyvinyl alcohol was used. As the first protective film 5, a triacetyl cellulose (TAC) film was used. As the 2nd protective film 9, the film comprised from cyclic olefin polymer type resin (COP type resin) was used. As the 3rd protective film 3, the PET protection film was used. As the release film 13, a PET separator was used. The thickness of the release film 13 was 38 m. The thickness of the adhesive layer 11 was 20 m. The thickness of the 2nd protective film 9 was 13 micrometers. The thickness of the polarizer 8 was 7 m. The thickness of the 1st protective film 5 was 25 micrometers. The thickness of the 3rd protective film 3 was 58 micrometers.

The 2nd laminated body 7' in which the cutout part 7C' was formed by the punching process of the 1st laminated body 107 was produced. The overall shape (outer edge) of the second laminate 7' was substantially rectangular. In the punching process, the width W of the lateral side of the second laminate 7' (the first end 7e in which the notch 7C' was formed) was adjusted to 150 mm. The width of the longitudinal side of the second laminate 7' (the total length D of the second laminate 7') was adjusted to 80 mm.

In the punching process, the concave notch 7C' was formed in the substantially central part of the 1st end part 7e of the 2nd laminated body 7'. As shown in Fig. 4, the shape of the cut-out portion 7C' was approximately rectangular. The radius of curvature R _L of the corner portion 7C _L of the cut-out portion 7C ′ as viewed from the stacking direction of the second laminate 7 ′ was adjusted to 3.0 mm. That is, the radius of curvature R _L of the corner portion 7C _L before polishing was 3.0 mm. The width W'c of the cut-out portion 7C' was adjusted to 20 mm. The length D'c of the cut-out portion 7C' was adjusted to 10 mm.

The entire notch 7C' before grinding was observed with an optical microscope. As a result of observation, it was confirmed that a small number of cracks were formed in the cut-out portion 7C'. The length of each crack was measured. As the length of the crack, the distance between one end of the crack and the other end of the crack was measured. The maximum value of the crack length was 300 μm.

Following the punching process, the entire inner side of the cutout portion 7C' including the corner portion 7C _L was uniformly polished with an end mill. That is, the radius of curvature R _L of the corner portion 7C _L was reduced by polishing. The width of the part cut out from the corner part _7CL of the 2nd laminated body 7' by the end mill was adjusted to 300 micrometers. As shown in FIG. ₅ , the radius of curvature RS of the corner portion 7C _S of the cut-out portion 7C after polishing as seen in the lamination direction of the second laminate 7 was adjusted to 2.0 mm.

By the above process, the polarizing plate (2nd laminated body 7) of Example 1 was completed. The entire concave cutout formed on the polarizing plate was observed under an optical microscope. No cracks were formed in the notch 7C of Example 1 (the notch 7C after grinding).

(Example 2)

In the punching process of Example 2, the radius of curvature R _L of the corner part 7C _L of the cut-out part 7C' was adjusted to 2.5 mm. In the same manner as in Example 1 except for the value of the radius of curvature (R _L ), a second laminate 7' of Example 2 (the second laminate 7' before polishing) was manufactured. The entire cutout 7C' formed in the second laminate 7' of Example 2 was observed with an optical microscope. As a result of observation, it was confirmed that a small number of cracks were formed in the cut-out portion 7C'. The maximum value of the crack length was 350 μm.

A polarizing plate (second laminate 7) of Example 2 was completed in the same manner as in Example 1 except for the value of the radius of curvature (R _L ) before polishing. The entire cutout 7C formed in the polarizing plate of Example 2 was observed with an optical microscope. No cracks were formed in the notch 7C of Example 2 (the notch 7C after grinding).

(Example 3)

In the punching process of Example 3, the radius of curvature R _L of the corner part 7C _L of the cut-out part 7C' was adjusted to 2.3 mm. In the same manner as in Example 1 except for the value of the radius of curvature (R _L ), a second laminate 7' of Example 3 (the second laminate 7' before polishing) was manufactured. The entire cutout 7C' formed in the second laminate 7' of Example 3 was observed with an optical microscope. As a result of observation, it was confirmed that a small number of cracks were formed in the cut-out portion 7C'. The maximum value of the crack length was 350 μm.

A polarizing plate (second laminate 7) of Example 3 was completed in the same manner as in Example 1 except for the value of the radius of curvature (R _L ) before polishing. The entire cutout 7C formed in the polarizing plate of Example 3 was observed with an optical microscope. No cracks were formed in the notch 7C of Example 3 (the notch 7C after grinding).

(Example 4)

In the punching process of Example 4, the radius of curvature R _L of the corner part 7C _L of the cut-out part 7C' was adjusted to 2.1 mm. In the same manner as in Example 1 except for the value of the radius of curvature (R _L ), a second laminate 7' of Example 4 (the second laminate 7' before polishing) was manufactured. The entire cutout 7C' formed in the second laminate 7' of Example 4 was observed with an optical microscope. As a result of observation, it was confirmed that a small number of cracks were formed in the cut-out portion 7C'. The maximum value of the crack length was 400 μm.

A polarizing plate (second laminate 7) of Example 4 was completed in the same manner as in Example 1 except for the value of the radius of curvature (R _L ) before polishing. The entire cutout 7C formed in the polarizing plate of Example 4 was observed with an optical microscope. A few cracks remained in the cutout 7C of Example 4 (the cutout 7C after polishing). However, the number of cracks remaining in the cut-out portion 7C after polishing was smaller than the number of cracks formed in the cut-out portion 7C' before polishing. The maximum value of the length of the cracks remaining in the notch 7C after grinding was smaller than the maximum value of the length of the crack formed in the notch 7C' before grinding.

(Comparative Example 1)

In the punching process of Comparative Example 1, the radius of curvature R _L of the corner 7C _L of the notch 7C' was adjusted to 2.0 mm. In addition, in Comparative Example 1, grinding|polishing was not implemented. That is, in Comparative Example 1, the polarizing plates having the same shape and dimensions as in Examples 1 to 4 were produced only by one punching process without passing through two steps of punching and polishing.

The entire cutout formed in the polarizing plate of Comparative Example 1 was observed with an optical microscope. Many cracks were formed in the cutout of Comparative Example 1. The number of cracks formed in the cutouts of Comparative Example 1 was larger than the number of cracks formed in the cutouts 7C of Examples 1 to 4 after polishing. The maximum value of the length of cracks formed in the cut-outs of Comparative Example 1 was larger than the maximum value of the lengths of cracks formed in the cut-outs 7C of Examples 1 to 4 after polishing.

The polarizing plate according to the present invention is applied as an optical component constituting an image display apparatus such as a liquid crystal television, an organic EL television, or a smartphone by being adhered to, for example, a liquid crystal cell or an organic EL device.

7: 2nd laminated body (polarizing plate) after grinding|polishing, 7': 2nd laminated body before grinding|polishing, 3: 3rd protective film, 5: 1st protective film, 8: Film-shaped polarizer, 7C: After grinding|polishing Concave cutout, 7C': Concave cutout before grinding, 7C1, 7C2: A pair of corners positioned at both ends of cutout 7C', 7C _L : Corner of cutout 7C' before grinding Part, 7C _S : the corner of the cut-out 7C after grinding, 7e: the first end of the second laminate 7', 9: the second protective film, 7Cd: the deep part of the cut-out 7C'; 11: Adhesive layer, 13: release film, 17e: second end of second laminate (7'), 107: first laminate, _{R L} : radius of curvature of corner portion (7C _L ) before polishing, RS : radius of curvature of corner portion 7C _S after polishing, L: reference line, A: absorption axis, E: direction in which cutout 7C' extends, θ: reference line L formed with absorption axis A Angle, α: The angle formed by the direction E in which the cutout 7C' extends with the absorption axis A of the polarizer 8 .

Claims (6)

A step of producing a first laminate comprising a film-type polarizer and at least one optical film overlapping the polarizer;
A step of producing a second laminate in which a concave notch is formed by punching the first laminate;
A process of reducing the radius of curvature of the corner by grinding a corner located inside the cutout
to provide
Before the corner portion is polished, the corner portion as viewed from the stacking direction of the second laminate is curved, and the radius of curvature of the corner portion is R _L ,
After the corner portion is polished, the radius of curvature of the corner portion viewed in the stacking direction of the second laminate is _RS ,
The manufacturing method of the said polarizing plate in which said R _L is larger than said R _S. The method of claim 1, wherein the corner portion is polished by an end mill. 3. The method of claim 1 or 2,
The second laminate has a first end that is not perpendicular to the absorption axis (A) of the polarizer,
The method of manufacturing a polarizing plate that the cut-out portion is formed in the first end. 4. The method of claim 3,
the second laminate has a second end opposite the first end;
The cut-out portion is formed at the first end,
the cut-out portion extends from the first end toward the second end;
A method of manufacturing a polarizing plate in which the direction (E) in which the cutouts extend is not parallel to the absorption axis (A). 3. The method of claim 1 or 2,
wherein the second laminate has a first end and a second end opposite the first end;
The cut-out portion is formed at the first end,
the cut-out portion extends from the first end toward the second end;
A method of manufacturing a polarizing plate in which the direction (E) in which the cutout extends is not parallel to the absorption axis (A) of the polarizer. The method for manufacturing a polarizing plate according to claim 3, wherein the first end portion as viewed from the lamination direction of the second laminate is linear.

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