KR20190123688A - Laminate - Google Patents

Abstract

The present invention relates to a laminate which performs a cutout process and, more specifically, to a laminate which does not produce a peeling defect of a peeling film when peeling off the peeling film from a short side which has a cutout part. A surface protection film is laminated on one side of a polarizing plate, and the peeling film is laminated on the other side of the polarizing plate, wherein the polarizing plate comprises a polarizer. The laminate has the cutout part in planar view, and a maximum value of the peeling force is 1.0 N or less when peeling off the peeling film from the short side which has the cutout part.

Description

Laminates {LAMINATE}

The present invention relates to a laminate.

The polarizing plate is widely used for image display apparatuses, such as a liquid crystal display device and an organic electroluminescent (EL) display apparatus, especially various mobile devices, such as a smart phone, in recent years. As a polarizing plate, the thing formed by bonding a protective film to the single side | surface or both surfaces of the polarizer which adsorbed and oriented a dichroic dye to the polyvinyl alcohol-type resin film is used conventionally.

The polarizing plate is generally marketed as a laminate in which a peelable surface protection film (also called a protective film) and a peeling film (also called a separate film) are adhered to the surface to prevent dirt or damage of the surface thereof. .

When bonding a polarizing plate to display elements, such as a liquid crystal cell and an organic electroluminescent element, the peeling film bonded to the surface is peeled off and a polarizing plate is bonded to a display element through the exposed adhesive layer. When peeling a peeling film, the surface protection film side of a laminated body (film in which a surface protection film is laminated | stacked on one surface of a polarizing plate, and the release film was laminated | stacked on the other surface) is hold | maintained by methods, such as suction and adsorption | suction. It is fixed to a stand and the peeling tape is bonded on a peeling film. Thereafter, the release tape is pulled to remove the release film from the polarizing plate surface.

In accordance with the design of the image display device, the laminate is often processed into a shape other than a rectangular shape. Specifically, the laminate is drilled in-plane, R-processed at its edges in plan view, or cut-in-processed in plan view. In particular, in the case where the laminate is cut in a plan view, when the peeling film starts to peel from the short side having the cutout portion, the peeling film cannot be peeled off when the peeling tip reaches the cutout portion. There was a problem. In keeping with the movement of the release film, the fixed polarizing plate and the surface protection film float from the holding table, and the fixing of the polarizing plate and the surface protection film is released and the peeling film cannot be easily peeled off.

This problem can be solved by increasing the force such as suction force or adsorption force when fixing the laminate, or by reducing the adhesive force of the release film. However, a new problem arises. That is, when the force acting on the laminated body such as a suction force or a suction force increases, traces remain on the polarizing plate and the appearance deteriorates. Moreover, when the adhesive force of a peeling film is made small, a gap will arise between a peeling film and a polarizing plate when an impact is applied to a laminated body by conveyance etc.

[Patent Document 1] WO2018 / 016285A1

The objective of this invention is providing the laminated body which does not produce the peeling defect of a peeling film.

[1] a surface protective film is laminated on one surface of the polarizing plate,

The release film is laminated on the other side of the polarizing plate,

The polarizing plate is a laminate comprising a polarizer,

The laminate has a cutout in plan view,

The laminated body whose maximum value of peeling force is 1.0 N or less when peeling the said peeling film from the short side which has the said notch.

[2] The laminate according to [1], in which the shape of the cutout portion satisfies the following formula (1).

r> 3d-14 (One)

[In Formula (1), d (mm) shows the depth of the said notch, and r (mm) shows the radius of curvature of the inner edge part in the said notch. "

[3] The polarizing plate includes an adhesive layer on a surface of the release film side,

The laminated body as described in [1] or [2] whose adhesive force between the said peeling film and the said adhesive layer is 0.02 N / 25 mm or more and 0.10 N / 25 mm or less.

[4] a lamination step of affixing a tape to an edge portion of one end of a short side having a cutout portion in the laminate according to any one of [1] to [3];

A peeling step of raising the tape and peeling the release film from the laminate;

The said peeling process WHEREIN: The manufacturing method of the polarizing plate with a surface protection film whose angle which the peeling direction of a tape and the short side orthogonal to the short side which has a notch forms is 25 degrees or more and 65 degrees or less.

According to this invention, the laminated body which does not produce the peeling defect of a peeling film can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the laminated constitution of the laminated body of this invention.
It is a schematic sectional drawing which shows an example of the laminated constitution of the laminated body of this invention.
It is a schematic top view which shows an example of the notch part which the laminated body of this invention has.
It is a schematic top view which shows an example of the notch part which the laminated body of this invention has.
It is a schematic top view which shows an example of the method of peeling a peeling film from a laminated body.

<Laminated body>

As for a laminated body, the surface protection film is laminated | stacked on one surface of a polarizing plate, and the peeling film is laminated | stacked on the other surface of a polarizing plate. The polarizing plate has at least a polarizer. EMBODIMENT OF THE INVENTION Hereinafter, an example of the laminated constitution of the laminated body of this invention is demonstrated with reference to drawings. In addition to a polarizer, a polarizing plate may be equipped with the protective film, retardation film, a brightness improving film, an adhesive layer, etc.

1 is a schematic cross-sectional view showing an example of a laminate of the present invention. The laminated body 100 shown to FIG. 1 (a) is laminated | stacked on the polarizing plate 10, the surface protection film 30 laminated | stacked on one surface of the polarizing plate 10, and the other surface of the polarizing plate 10. FIG. It consists of the peeled film 20 which became. As for the polarizing plate 10, the protective film 12 is laminated | stacked on the one surface of the polarizer 11 through the adhesive bond layer which is not shown in figure, and the retardation film 14 is laminated | stacked on the other surface through the adhesive layer 16, and This is a layer structure in which the pressure-sensitive adhesive layer 15 is laminated on the retardation film 14.

The laminated body 101 shown in FIG.1 (b) is laminated | stacked on the polarizing plate 10, the surface protection film 30 laminated | stacked on one surface of the polarizing plate 10, and the other surface of the polarizing plate 10. FIG. It consists of the peeled film 20 which became. As for the polarizing plate 10, the protective film 12 is laminated | stacked on the one surface of the polarizer 11 via the adhesive bond layer which is not shown in figure, and the protective film 13 is laminated | stacked on the other surface via the adhesive bond layer which is not shown in figure. The retardation film 14 is laminated on the protective film 13 via the adhesive layer 16, and the pressure-sensitive adhesive layer 15 is laminated on the retardation film 14.

The laminated body 102 shown in FIG.2 (a) is laminated | stacked on the polarizing plate 10, the surface protection film 30 laminated | stacked on one surface of the polarizing plate 10, and the other surface of the polarizing plate 10. FIG. It consists of the peeled film 20 which became. As for the polarizing plate 10, the protective film 13 is laminated | stacked on the one surface of the polarizer 11 through the adhesive bond layer which is not shown in figure, and the brightness improving film 17 is laminated | stacked on the other surface through the adhesive layer 16. It is a layer structure in which the adhesive layer 15 was laminated | stacked on the protective film 13.

The laminated body 103 shown in FIG.2 (b) is laminated | stacked on the polarizing plate 10, the surface protection film 30 laminated | stacked on one surface of the polarizing plate 10, and the other surface of the polarizing plate 10. FIG. It consists of the peeled film 20 which became. As for the polarizing plate 10, the protective film 12 is laminated | stacked on the one surface of the polarizer 11 via the adhesive bond layer which is not shown in figure, and the protective film 13 is laminated | stacked on the other surface via the adhesive bond layer which is not shown in figure. The brightness enhancement film 17 is laminated on the protective film 12 via the adhesive layer 16, and the pressure-sensitive adhesive layer 15 is laminated on the protective film 13.

In the laminated bodies 100-103, it is preferable that the surface protection film 30 and the peeling film 20 are members which comprise the outermost surface of a laminated body, respectively. The laminated body 100-103, the polarizing plate 10, the peeling film 20, and the surface protection film 30 may have layers other than the layer shown.

It is preferable that a laminated body has a substantially rectangular shape in the main surface. The main surface means the surface having the largest area corresponding to the display surface. The substantially rectangular shape means that the laminate has a shape or rounded shape in which at least one corner portion of four corners (edges) of the main surface is obtuse, or a part of an end surface perpendicular to the main surface is in the in-plane direction. It may have a recessed part (cutout part), or a part in the main surface may have a perforated part cut out in a shape such as a circle, an ellipse, a polygon, or a combination thereof.

The laminate has a cutout in at least one end face in plan view. As described above, the notch refers to a portion in which a part of the end surface perpendicular to the main surface is recessed in the in-plane direction in plan view. The laminate may have one or a plurality of cutouts. The laminate may have a plurality of cutouts on one short side, but preferably has one cutout on one short side. The notch may be formed at a short side perpendicular or parallel to the absorption axis of the polarizer. Since a laminated body has a notch in an end surface in plan view, when a laminated body is seen from an upper surface, it becomes a shape where the edge part recessed toward in surface.

When the laminated body of this invention peels the said peeling film from the short side which has a notch, the maximum value of peeling force is 1.0 N or less. It is preferable that the maximum value of peeling force is 0.8 N or less. The maximum value of peeling force may be 0.1 N or more. The maximum value of peeling force is controlled by the shape of a notch, etc. as mentioned later. The maximum value of peeling force can be measured by the method as described in the Example mentioned later. By setting it as such peeling force, a peeling defect will hardly arise.

It is preferable that the shape of the notch part with which the laminated body of this invention is equipped satisfies following formula (1).

In the case where the laminate has a plurality of cutouts, at least one cutout may satisfy Expression (1), and all cutouts may satisfy Expression (1). When the shape of a cutout part satisfy | fills said Formula (1), the force required when peeling a peeling film can be made small.

r> 3d-14 (One)

[In Formula (1), d (mm) shows the depth of the said notch, and r (mm) shows the radius of curvature of the inner edge part in the said notch. "

3, the schematic diagram which looked at an example of the laminated body 104 of this invention from the upper surface is shown. This laminated body 104 has the notch 40 in the planar view seen from the upper surface. The notch part 40 is formed in the shape recessed toward the surface inside from the edge part. The depth of a notch corresponds to the length of both arrows d in FIG. 3, and says the distance from a short side to the deepest part of a recess. The radius of curvature of the inner corner portion at the notch corresponds to the radius of curvature of the corner portion indicated by one arrow R in FIG. 3. When the radius of curvature of the two inner corner portions is different, r denotes the smaller radius of curvature. It is preferable that the curvature radii of two inner edge parts are mutually the same.

r and d are both greater than zero. Although not particularly limited, the upper limit of r may be 17 mm. Although not specifically limited, the upper limit of d may be 20 mm. d may be 10 mm or less, and may be 7 mm or less.

When d is more than 2 mm and 5 mm or less, it is preferable that r is 2 mm or more. When d is more than 5 mm and 6 mm or less, it is preferable that r is 8 mm or more. When d is more than 6 mm and 8 mm or less, it is preferable that r is 13 mm or more. When d is more than 8 mm, it is preferable that r is 17 mm or more.

The width | variety of a notch can be 5 mm or more and 50 mm or less, and it is preferable that they are 5 mm or more and 20 mm or less. The width | variety of a notch part is length parallel to a short side, and means the longest distance of a notch part.

The shape of the cutout may be specifically, a shape shown in FIG. 4. Fig. 4 is a schematic view showing an example of the cutout portion 40 in the laminate of the present invention in plan view, and the cutout portion 40 is shown in Fig. 4A in the planar view as seen from the upper surface thereof. Similarly, rounding is formed on two inner corners in the rectangular recess, and rounding is formed on the four corners in the rectangular recess as shown in FIG. It may be one shape. In addition, the cutout portion may have a shape in which rounding is formed at the corner portion of the trapezoidal concave portion, as shown in FIG. 4C. As shown in Figs. 4A to 4C, the cutout may have a straight portion at the bottom, and as shown in Fig. 4D, the cutout has a straight portion at the bottom. You do not have to.

A laminated body may be obtained by manufacturing a long laminated body by a roll-to-roll, conveying each member which comprises a laminated body, respectively, and cutting this, and preparing each member of a predetermined shape, respectively, You may obtain by laminating sequentially.

When the laminate has a rectangular shape (or substantially rectangular shape) having long sides and short sides, the length of the long sides is preferably 35 to 5 cm, more preferably 25 to 10 cm, and the length of the short sides is 25 to It is preferable that it is 5 cm, and it is more preferable that it is 20-6 cm. By setting it as the magnitude | size of such a range, peelability can be improved more.

Hereinafter, each member which a laminated body has is demonstrated.

<Polarizing plate>

The polarizing plate 10 is a polarizing element including at least a polarizer, and usually further includes a thermoplastic resin film bonded to one or both surfaces thereof. The thermoplastic resin film may be a protective film for protecting the polarizer, another film having an optical function, or the like. The thermoplastic resin film may be provided with a resin layer (for example, at least one optical layer selected from a hard coat layer, an antistatic layer, an antiglare layer, a light diffusion layer, an antireflection layer, a low refractive index layer, an antifouling layer, etc.) laminated on the surface thereof. The thermoplastic resin film can be bonded to the polarizer through the adhesive layer. The surface protection film 30 may be laminated | stacked on the surface of this resin layer.

When a laminated body contains a brightness improving film and retardation film further, the effect of this invention is remarkable. The polarizing plate containing a brightness improving film etc. is low in rigidity, and peeling defect is easy to generate | occur | produce. According to this invention, even if a laminated body contains a brightness improving film etc., generation | occurrence | production of peeling defect can be reduced.

The thickness (micrometer) of a polarizing plate is 150 micrometers or less normally, and when the rigidity is 75 micrometers or less and further 70 micrometers or less, the effect of this invention is remarkable. The thickness of the polarizing plate 10 becomes like this. Preferably it is 30 micrometers or more, More preferably, it is 50 micrometers or more.

(1) polarizer

The polarizer which comprises the polarizing plate 10 absorbs linearly polarized light which has a vibration surface parallel to the absorption axis, and has an absorption type which has the property to transmit the linearly polarized light which has a vibration surface orthogonal to (or parallel to a transmission axis) to an absorption axis. It is a polarizer of and can use suitably the polarizer which adsorbed and oriented a dichroic dye to the uniaxially stretched polyvinyl alcohol-type resin film. The polarizer is, for example, a step of uniaxially stretching a polyvinyl alcohol-based resin film; Adsorbing a dichroic dye by dyeing a polyvinyl alcohol-based resin film with a dichroic dye; Treating a polyvinyl alcohol-based resin film adsorbed with a dichroic dye with a crosslinking solution such as an aqueous boric acid solution; And the step of washing with water after treatment with the crosslinking liquid.

As polyvinyl alcohol-type resin, what saponified polyvinyl acetate type resin can be used. As polyvinyl acetate type resin, the copolymer etc. with other monomer copolymerizable with vinyl acetate besides the polyvinyl acetate which is a homopolymer of vinyl acetate are mentioned. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, (meth) acrylamides having an ammonium group, and the like.

In this specification, "(meth) acryl" means at least one selected from acryl and methacryl. The same applies to "(meth) acryloyl", "(meth) acrylate" and the like.

The saponification degree of polyvinyl alcohol-type resin is 85-100 mol% normally, and 98 mol% or more is preferable. The polyvinyl alcohol-based resin may be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The average polymerization degree of polyvinyl alcohol-type resin is 1000-10000 normally, and 1500-5000 are preferable. The average polymerization degree of polyvinyl alcohol-type resin can be calculated | required based on JISK6726.

What formed such a polyvinyl alcohol-type resin into a film is used as a raw film of a polarizer (polarizer). The method of forming a polyvinyl alcohol-type resin into a film is not specifically limited, A well-known method is employ | adopted. Although the thickness of a polyvinyl alcohol-based master film is not specifically limited, In order to make thickness of a polarizer into 15 micrometers or less, it is preferable to use 5-35 micrometers. More preferably, it is 20 micrometers or less.

Uniaxial stretching of a polyvinyl alcohol-type resin film can be performed before dyeing, simultaneously with dyeing, or after dyeing of a dichroic dye. When uniaxial stretching is performed after dyeing, this uniaxial stretching may be performed before or during crosslinking treatment. In addition, you may uniaxially stretch in several of these steps.

At the time of uniaxial stretching, you may extend | stretch uniaxially between the rolls from which a circumferential speed differs, and may extend | stretch uniaxially using a hot roll. Moreover, uniaxial stretching may be dry stretching which extends | stretches in air | atmosphere, and wet extending | stretching may be performed in the state which swelled the polyvinyl alcohol-type resin film using a solvent and water. The draw ratio is usually 3 to 8 times.

As a method of dyeing a polyvinyl alcohol-type resin film with a dichroic dye, the method of immersing the said film in the aqueous solution containing a dichroic dye is employ | adopted, for example. As a dichroic dye, iodine and a dichroic organic dye are used. On the other hand, it is preferable that the polyvinyl alcohol-type resin film is immersed in water before a dyeing process.

As a crosslinking process after dyeing with a dichroic dye, the method of immersing the dyed polyvinyl alcohol-type resin film in boric acid containing aqueous solution is employ | adopted normally. When using iodine as a dichroic dye, it is preferable that this boric acid containing aqueous solution contains potassium iodide.

The thickness of a polarizer is 30 micrometers or less normally, Preferably it is 20 micrometers or less, More preferably, it is 15 micrometers or less, More preferably, it is 10 micrometers or less. In particular, the thickness of the polarizer to be 15 μm or less is advantageous for thinning the laminate. It is preferable that the thickness of a polarizer is 2 micrometers or more normally, and is 3 micrometers or more from a viewpoint of making elasticity a polarizing plate.

As a polarizer, as described in Unexamined-Japanese-Patent No. 2016-170368, you may use the thing in which the dichroic dye was oriented in the cured film by which the liquid crystal compound was superposed | polymerized. As a dichroic dye, what has absorption in the range of wavelength 380-800 nm can be used, and it is preferable to use an organic dye. As a dichroic dye, an azo compound is mentioned, for example. The liquid crystal compound is a liquid crystal compound capable of polymerizing while being oriented, and may have a polymerizable group in a molecule.

(2) protective film

The protective film which can be laminated on one or both surfaces of the polarizer is a transparent (preferably optically transparent) thermoplastic resin, for example, a linear polyolefin resin (polypropylene resin or the like) or a cyclic ring. Polyolefin resins such as polyolefin resins (norbornene resins, etc.); Cellulose resins such as triacetyl cellulose and diacetyl cellulose; Polyester resins such as polyethylene terephthalate and polybutylene terephthalate; Polycarbonate resins; (Meth) acrylic resins such as methyl methacrylate resin; Polystyrene resin; Polyvinyl chloride resins; Acrylonitrile butadiene styrene resin; Acrylonitrile-styrene resins; Polyvinyl acetate type resin; Polyvinylidene chloride-based resins; Polyamide-based resins; Polyacetal resins; Modified polyphenylene ether resins; Polysulfone resins; Polyether sulfone resin; Polyarylate resins; Polyamideimide resin; It may be a film made of polyimide resin or the like.

Examples of the linear polyolefin-based resin include polyethylene resin (polyethylene resin which is a homopolymer of ethylene and copolymer mainly composed of ethylene), polypropylene resin (polypropylene resin which is a homopolymer of propylene and copolymer mainly composed of propylene) and In addition to the homopolymer of the same linear olefin, the copolymer which consists of 2 or more types of linear olefins is mentioned.

Cyclic polyolefin resin is a general term for resin superposed | polymerized using a cyclic olefin as a polymerization unit, For example, Unexamined-Japanese-Patent No. 1-240517, Unexamined-Japanese-Patent No. 3-14882, and Unexamined-Japanese-Patent No. 3 The resin described in -122137 grade | etc., Is mentioned. Specific examples of the cyclic polyolefin resin include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, and copolymers of cyclic olefins with chain olefins such as ethylene and propylene (typically random copolymers). ) And graft polymers modified with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof. Especially, norbornene-type resin using norbornene-type monomers, such as a norbornene and a polycyclic norbornene-type monomer, is used suitably as cyclic olefin.

Polyester-based resin is resin which has an ester bond except the following cellulose ester-type resin, and what consists of polycondensates of polyhydric carboxylic acid or its derivative (s), and a polyhydric alcohol is common. As polyhydric carboxylic acid or its derivative (s), divalent dicarboxylic acid or its derivative (s) can be used, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate and dimethyl naphthalene dicarboxylic acid. Divalent diol can be used as a polyhydric alcohol, For example, ethylene glycol, a propanediol, butanediol, neopentyl glycol, cyclohexane dimethanol is mentioned. As a representative example of polyester resin, the polyethylene terephthalate which is a polycondensate of terephthalic acid and ethylene glycol is mentioned.

(Meth) acrylic-type resin is resin which makes the compound which has a (meth) acryloyl group the main structural monomer. Specific examples of the (meth) acrylic resins include poly (meth) acrylic acid esters such as polymethyl methacrylate; Methyl methacrylate- (meth) acrylic acid copolymer; Methyl methacrylate- (meth) acrylic acid ester copolymer; Methyl methacrylate-acrylic acid ester- (meth) acrylic acid copolymer; Methyl (meth) acrylate-styrene copolymers (MS resin and the like); Copolymers of a compound having methyl methacrylate with an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl copolymer, methyl methacrylate-norbornyl copolymer, etc.). Preferably, a polymer having a poly (meth) acrylic acid C _1-6 alkyl ester such as methyl poly (meth) acrylate as the main component is used, and more preferably, methyl methacrylate as the main component (50 to 100% by weight, Preferably, the methyl methacrylate type resin made into 70 to 100 weight%) is used.

Cellulose ester-type resin is ester of a cellulose and a fatty acid. Specific examples of the cellulose ester-based resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate. Moreover, these copolymers and the thing in which one part of hydroxyl group was modified by another substituent are mentioned. Among these, cellulose triacetate (triacetyl cellulose) is particularly preferable.

Polycarbonate resin is an engineering plastic which consists of a polymer in which the monomeric unit couple | bonded through the carbonate group.

It is also useful to control the phase difference value of a protective film to the value suitable for image display apparatuses, such as a liquid crystal display device. For example, in the liquid crystal display device of in-plane switching (IPS) mode, it is preferable to use the film whose phase difference value is substantially zero as a protective film. Substantially the phase difference value is zero, the in-plane phase difference value R ₀ at wavelength 590 nm is 10 nm or less, the absolute value of the thickness direction phase difference value R _th at wavelength 590 nm is 10 nm or less, and the wavelength is 480-750 It means that the absolute value of the thickness direction retardation value R _th in nm is 15 nm or less.

For example, depending on the mode of a liquid crystal display device, you may extend | stretch and / or shrink process etc. to a protective film, and may provide a suitable phase difference value. For example, for the purpose of viewing angle compensation, a retardation layer (or film) having a single layer or a multilayer structure can be used as the protective film. In this case, the polarizing plate 10 may be an elliptical polarizing plate or circular polarizing plate including a laminated structure of a polarizer and a retardation layer, or a polarizing plate having a viewing angle compensation function including a retardation layer.

Although the thickness of a protective film is 1-100 micrometers normally, it is preferable that it is 5-60 micrometers from a viewpoint of strength, handleability, etc., It is more preferable that it is 10-55 micrometers, It is further more preferable that it is 15-40 micrometers.

When the protective film is bonded to both surfaces of a polarizer, these protective films may be comprised with the same kind of thermoplastic resin, and may be comprised with the heterogeneous thermoplastic resin. Moreover, thickness may be the same and may differ. Moreover, it may have the same phase difference characteristic, and may have a different phase difference characteristic.

As described above, at least one surface of the protective film has a surface such as a hard coat layer, an antiglare layer, a light diffusion layer, an antireflection layer, a low refractive index layer, an antistatic layer, and an antifouling layer on its outer surface (surface opposite to the polarizer). A treatment layer (coating layer) may be provided. In addition, the thickness of a protective film includes the thickness of a surface treatment layer.

From the viewpoint of suppressing mixing of bubbles between the surface protective film and the polarizing plate, the surface on the surface protective film 30 side in the polarizing plate 10 (the surface to which the surface protective film 30 is bonded) is a surface treatment layer. It is preferable that arithmetic mean roughness Ra based on JISB0601: 2013 is small. Specifically, Ra of the said surface becomes like this. Preferably it is 0.3 micrometer or less, More preferably, it is 0.2 micrometer or less, More preferably, it is 0.15 micrometer or less. Ra on the surface is usually 0.001 µm or more, for example, 0.005 µm or more.

The protective film can be bonded to the polarizer via, for example, an adhesive layer. As an adhesive agent which forms an adhesive bond layer, an aqueous adhesive agent, an active energy ray curable adhesive agent, or a thermosetting adhesive agent can be used, Preferably it is an aqueous adhesive agent and an active energy ray curable adhesive agent.

As an aqueous adhesive agent, the adhesive agent which consists of polyvinyl alcohol-type resin aqueous solution, an aqueous two-component urethane emulsion adhesive, etc. are mentioned. Especially, the aqueous adhesive which consists of aqueous solution of polyvinyl alcohol-type resin is used suitably. As polyvinyl alcohol-type resin, in addition to the vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate which is a homopolymer of vinyl acetate, the polyvinyl alcohol-type air obtained by saponifying the copolymer of vinyl acetate and the other monomer copolymerizable with this. The modified polyvinyl alcohol polymer etc. which partially modified | polymerized or these hydroxyl groups can be used. The aqueous adhesive may include a crosslinking agent such as an aldehyde compound (glyoxal or the like), an epoxy compound, a melamine compound, a methylol compound, an isocyanate compound, an amine compound, a polyvalent metal salt, or the like.

When using an aqueous adhesive agent, after bonding a polarizer and a protective film, it is preferable to perform the drying process for removing the water contained in an aqueous adhesive agent. After a drying process, you may provide the curing process cured at the temperature of 20-45 degreeC, for example.

The said active energy ray curable adhesive agent is an adhesive agent containing the curable compound hardened | cured by irradiation of active energy rays, such as an ultraviolet-ray, visible light, an electron beam, and X-ray, Preferably it is an ultraviolet curable adhesive agent.

The curable compound may be a cationic polymerizable curable compound or a radical polymerizable curable compound. As a cationically polymerizable curable compound, For example, an epoxy type compound (compound which has 1 or 2 or more epoxy groups in a molecule), an oxetane type compound (compound which has 1 or 2 or more oxetane rings in a molecule), or these And combinations thereof. As a radically polymerizable curable compound, For example, (meth) acrylic-type compound (compound which has one or two or more (meth) acryloyloxy groups in a molecule), the other vinyl type compound which has a radically polymerizable double bond, or A combination of these. You may use together a cationically polymerizable curable compound and a radically polymerizable curable compound. The active energy ray curable adhesive usually further contains a cationic polymerization initiator and / or a radical polymerization initiator for initiating the curing reaction of the curable compound.

When bonding a polarizer and a protective film, in order to improve adhesiveness, you may surface-treat at least one of these bonding surfaces. As the surface activation treatment, dry treatment such as corona treatment, plasma treatment, discharge treatment (glow discharge treatment, etc.), flame treatment, ozone treatment, UV ozone treatment, ionizing active line treatment (ultraviolet treatment, electron beam treatment, etc.); Wet processes, such as the ultrasonication, saponification process, and anchor coat process using solvents, such as water and acetone, are mentioned. These surface activation processes may be performed independently and may combine 2 or more.

When the protective film is bonded to both surfaces of the polarizer, the adhesive for bonding these protective films may be the same kind of adhesive or a heterogeneous adhesive.

(3) other film

The polarizing plate 10 may contain other films other than a polarizer and a protective film, and the representative examples are a brightness improving film and a retardation film. When the polarizing plate 10 includes another film, the surface protection film 30 may be laminated on the surface of this film or the surface of the surface treatment layer laminated | stacked on this film.

The brightness enhancement film is also called a reflective polarizer, and a polarization conversion element having a function of separating light emitted from a light source (backlight) into transmission polarization and reflection polarization or scattering polarization is used. By arrange | positioning a brightness improving film on a polarizer, the emission efficiency of the linearly polarized light radiate | emitted from a polarizer can be improved using the retroreflective light which is reflection polarization or scattering polarization. A brightness improving film can be laminated | stacked on a polarizer through an adhesive layer. Another film, such as a protective film, may be interposed between the polarizer and the brightness enhancing film.

The brightness enhancing film may be, for example, an anisotropic reflective polarizer. An example of an anisotropic reflective polarizer is an anisotropic multiple thin film which transmits linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction, and the specific example is "APF" made by 3M Corporation. Another example of an anisotropic reflective polarizer is a composite of a cholesteric liquid crystal layer and a λ / 4 plate, and the specific example is "PCF" manufactured by Nitto Denko Corporation. Another example of an anisotropic reflective polarizer is a reflective grid polarizer, and the specific example is a metal lattice reflective polarizer and metal fine particles, such as those which give fine processing to the metal and emit the reflected polarized light in the visible light region, and are drawn by stretching them in the polymer matrix. It is a film.

As described above, on the outer surface of the brightness enhancement film, a hard coat layer, an antiglare layer, a light diffusion layer, a retardation layer (such as a retardation layer having a phase difference value of 1/4 wavelength), an antireflection layer, a low refractive index layer, an antistatic layer, and a contamination You may form the surface treatment layer (coating layer) like a prevention layer. By forming such a layer, the adhesiveness with a backlight tape and the uniformity of a display image can be improved. Although the thickness of the brightness improving film 50 is 10-100 micrometers normally, Preferably it is 10-50 micrometers, More preferably, it is 10-30 micrometers.

As a retardation film, positive A plates, such as a quarter wavelength ((lambda) / 4) plate, a 1/2 wavelength ((lambda) / 2) plate), a positive C plate, etc. are mentioned. The λ / 4 plate is a layer in which the in-plane retardation value Re (550) at the wavelength of 550 nm satisfies the relationship of 100 nm ≤ Re (550) ≤ 200 nm. The λ / 4 plate may exhibit reverse wavelength dispersion that satisfies Re (450) <Re (550) <Re (650). The λ / 2 plate is a layer in which Re (550) satisfies 210 nm ≤ Re (550) ≤ 300 nm. The positive C plate satisfies the relationship Nz> Nx ≧ Ny, and the phase difference value Rth (λ) in the thickness direction at the wavelength λ nm satisfies the relationship of −300 nm ≦ Rth (550) ≦ -20 nm. It is desirable to.

Retardation film can be formed, for example with resin illustrated as a material of the said protective film, Especially, cyclic olefin resin and styrene resin are preferable. The retardation layer may be formed of a single layer or may be formed of a plurality of layers. Examples of the retardation layer having a plurality of layers include a resin film (base film) exemplified as a material of the protective film, and a layer on which a liquid crystal compound polymerized with a liquid crystal compound is cured. The liquid crystal compound may contain a cured layer. The layer having a phase difference may be a layer in which a resin film and / or a liquid crystal compound is cured. The resin film can also serve as the protective film.

A retardation film may consist of one type of retardation layer, and may consist of multiple types of retardation layer. When a retardation film consists of a some retardation layer, the combination of a quarter wave plate and a half wave plate, and the combination of a quarter wave plate and a positive C plate are preferable.

It is preferable that the retardation film contains the layer which the liquid crystal compound hardened | cured, and when the retardation film consists of several retardation layer, either retardation layer may also contain the layer which the liquid crystal compound hardened | cured. Although it does not specifically limit about the kind of liquid crystal compound, According to the shape, it can classify into a rod-shaped type (rod-shaped liquid crystal compound) and a discotic type (disc-shaped liquid crystal compound, a discotic liquid crystal compound). Can be. In addition, there are low molecular type and high polymer type, respectively. On the other hand, a polymer generally means that the degree of polymerization is 100 or more (polymer physics-phase transition dynamics, Masao Doi, 2 pages, Iwanami Bookstore, 1992). In this embodiment, either liquid crystal compound can also be used. Moreover, you may use 2 or more types of rod-like liquid crystal compounds, 2 or more types of discotic liquid crystal compounds, or a mixture of a rod-shaped liquid crystal compound and a discotic liquid crystal compound.

In addition, as a rod-shaped liquid crystal compound, the thing of Claim 1 of Unexamined-Japanese-Patent No. 11-513019, or Paragraph [0026]-[0098] of Unexamined-Japanese-Patent No. 2005-289980 can be used suitably, for example. have. Examples of the discotic liquid crystal compound include those described in paragraphs [0020] to [0067] of JP 2007-108732 A, or paragraphs [0013] to [0108] of JP 2010-244038A. It can use suitably.

As for a retardation layer, it is more preferable to form using the liquid crystal compound (rod-like liquid crystal compound or disk shaped liquid crystal compound) which has a polymeric group. Thereby, the temperature change and the humidity change of an optical characteristic can be made small.

The liquid crystal compound may be a mixture of two or more kinds. In that case, it is preferable that at least one has two or more polymerizable groups. That is, it is preferable that the retardation layer is a layer in which the rod-like liquid crystal compound having a polymerizable group or the discotic liquid crystal compound having a polymerizable group is fixed by polymerization. In this case, after forming the layer, it is no longer necessary to show liquid crystallinity.

The kind of the polymerizable group contained in the rod-like liquid crystal compound or the discotic liquid crystal compound is not particularly limited, and for example, a functional group capable of addition polymerization reaction such as a polymerizable ethylenically unsaturated group or a ring polymerizable group is preferable. More specifically, a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group, etc. are mentioned, for example. Especially, a (meth) acryloyl group is preferable. In addition, a (meth) acryloyl group is a concept containing both a methacryloyl group and an acryloyl group.

The formation method of a retardation layer is not specifically limited, A well-known method is mentioned. For example, an optically anisotropic layer-forming composition (hereinafter, simply referred to as "composition") containing a liquid crystal compound having a polymerizable group is applied to a predetermined substrate (including a substrate) to form a coating film. And the retardation layer can be manufactured by hardening process (irradiation of ultraviolet rays (light irradiation process) or heat processing) with respect to the obtained coating film. The manufactured retardation layer can be transferred onto a polarizer or a protective film, for example.

Application of the composition can be carried out by a known method such as a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method.

The composition may contain components other than the liquid crystal compound mentioned above. For example, the polymerization initiator may be contained in the composition. As the polymerization initiator to be used, for example, a thermal polymerization initiator or a photopolymerization initiator is selected according to the type of the polymerization reaction. For example, as a photoinitiator, the (alpha)-carbonyl compound, the acyloinether, the (alpha) -hydrocarbon substituted aromatic acyloin compound, a polynuclear quinone compound, the combination of a triarylimidazole dimer, and p-aminophenyl ketone, etc. are mentioned. . It is preferable that it is 0.01-20 mass% with respect to the total solid of a composition, and, as for the usage-amount of a polymerization initiator, it is more preferable that it is 0.5-5 mass%.

In addition, a polymerizable monomer may be contained in the composition from the point of uniformity of a coating film and the strength of a film | membrane. A radically polymerizable or cationically polymerizable compound is mentioned as a polymerizable monomer. Especially, a polyfunctional radically polymerizable monomer is preferable.

On the other hand, as a polymerizable monomer, the above-mentioned polymerizable group containing liquid crystal compound and a copolymerizable thing are preferable. As a specific polymerizable monomer, the thing of Paragraph [0018]-[0020] of Unexamined-Japanese-Patent No. 2002-296423 is mentioned, for example. It is preferable that it is 1-50 mass% with respect to the total mass of a liquid crystal compound, and, as for the usage-amount of a polymeric monomer, it is more preferable that it is 2-30 mass%.

Moreover, surfactant may be contained in a composition from the point of the uniformity of a coating film, and the strength of a film | membrane. As surfactant, a conventionally well-known compound is mentioned. Especially, especially a fluorine compound is preferable.

In addition, the solvent may contain the composition, and an organic solvent is used preferably. As an organic solvent, for example, an amide (e.g., N, N-dimethylformamide), a sulfoxide (e.g., dimethyl sulfoxide), a heterocyclic compound (e.g., pyridine), a hydrocarbon (e.g., benzene, hexane), an alkyl halide ( Chloroform, dichloromethane), esters (e.g. methyl acetate, ethyl acetate, butyl acetate), ketones (e.g. acetone, methyl ethyl ketone), ethers (e.g. tetrahydrofuran, 1,2-dimethoxyethane) Can be mentioned. Especially, alkyl halide and ketone are preferable. Moreover, you may use together 2 or more types of organic solvents.

The composition also includes various alignment agents such as vertical alignment accelerators such as a polarizer interface side vertical alignment agent and an air interface side vertical alignment agent, and horizontal alignment accelerators such as a polarizer interface side horizontal alignment agent and an air interface side horizontal alignment agent. You may be. In addition to the above components, the composition may contain an adhesion improving agent, a plasticizer, a polymer, and the like.

The retardation film may contain the alignment film which has a function which defines the orientation direction of a liquid crystal compound. An alignment film generally has a polymer as a main component. As a polymer material for oriented films, many documents have description and a lot of commercial items can be obtained. Especially, it is preferable to use polyvinyl alcohol, polyimide, and its derivative as a polymer material, and it is especially preferable to use modified or unmodified polyvinyl alcohol.

In addition, a well-known orientation process is given to an orientation film normally. For example, although a rubbing process, the photo-alignment process which polarizes, etc. are mentioned, Photo-alignment process is preferable from a viewpoint of the surface roughness of an oriented film.

Although the thickness in particular of the layer which hardened the liquid crystal compound is not restrict | limited, 0.5-10 micrometers is preferable and 1.0-5 micrometers is more preferable. Although the thickness of an orientation film is not specifically limited, It is 20 micrometers or less in many cases, Especially, it is preferable that it is 0.01-10 micrometers, It is more preferable that it is 0.01-5 micrometers, It is more preferable that it is 0.01-1 micrometer.

(4) pressure-sensitive adhesive layer

It is preferable that the polarizing plate 10 has the adhesive layer 15 in the outermost surface. This adhesive layer can be used in order to bond the polarizing plate 10 to a display element (for example, liquid crystal cell, organic electroluminescent element), or another optical member, and is an adhesive layer which peels and exposes the peeling film 20. FIG. Moreover, an adhesive layer can also be used for laminating | stacking a polarizer, a protective film, a brightness improving film, and a retardation film. 1 and 2, the adhesive layer 16 corresponds to this. An adhesive layer can be comprised by the adhesive composition which has resin, such as (meth) acrylic-type, rubber type, urethane type, ester type, silicone type, and polyvinyl ether type as a main component. Especially, the adhesive composition which uses (meth) acrylic-type resin which is excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is suitable. An active energy ray hardening type and a thermosetting type may be sufficient as an adhesive composition.

Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include (meth) such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. The polymer or copolymer which uses 1 type, or 2 or more types of acrylate ester as a monomer is used suitably. It is preferable to copolymerize a polar monomer to a base polymer. As a polar monomer, (meth) acrylic acid, 2-hydroxypropyl (meth) acrylic acid, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, glycy The monomer which has a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc. like a dill (meth) acrylate is mentioned.

Although the adhesive composition may contain only the said base polymer, it usually contains a crosslinking agent further. As a crosslinking agent, it is a bivalent or more metal ion, and forms a carboxylic acid metal salt between a carboxyl group; It is a polyamine compound and forms an amide bond between carboxyl groups; Polyepoxy compounds and polyols, forming ester bonds with carboxyl groups; It is a polyisocyanate compound and what forms an amide bond between carboxyl groups is illustrated. Especially, a polyisocyanate compound is preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays or electron beams, and has adhesiveness even before active energy ray irradiation, and can be adhered to adherends such as films, and irradiates active energy rays. It is an adhesive composition which has a property which is hardened | cured and can adjust adhesive force. It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curing type. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray polymerizable compound in addition to the base polymer and the crosslinking agent. Moreover, you may make it contain a photoinitiator, a photosensitizer, etc. as needed.

The pressure-sensitive adhesive composition includes particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, antistatic agents, tackifiers, fillers (metal powder or other inorganic powders, etc.), oxidation Additives, such as an inhibitor, a ultraviolet absorber, dye, a pigment, a coloring agent, an antifoamer, a corrosion inhibitor, a photoinitiator, may be included.

An adhesive layer can be formed by apply | coating the organic solvent dilution liquid of the said adhesive composition on a base material, and drying. The substrate may be a polarizer, a protective film, another optical film such as a brightness enhancement film, a release film (eg, the release film 20), or the like. When using an active energy ray hardening-type adhesive composition, it can be set as the hardened | cured material which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

Although the thickness of the adhesive layer 15 is 1-40 micrometers normally, it is 3-25 micrometers (for example, 3-25 micrometers) from a viewpoint of thinning of a laminated body, and suppressing the dimensional change of the polarizing plate 10, maintaining a favorable workability. 20 micrometers, 3-15 micrometers) is preferable. Although the thickness of the contact bonding layer 16 is 1-20 micrometers normally, it is preferable that it is 3-10 micrometers.

The adhesive force with respect to a peeling film of the adhesive layer 15 in which the peeling film 20 is laminated | stacked is 0.10 N / 25 mm or less, Preferably it is 0.04 N / 25 mm or less. By setting it as such adhesive force, when a peeling film is peeled off, a float does not generate | occur | produce in a polarizing plate and peelability improves further. Moreover, adhesive force is 0.02 N / 25 mm or more. By setting it as such adhesive force, even if an impact is applied to a laminated body by conveyance etc., it is easy to prevent that a clearance gap arises between a peeling film and an adhesive layer. In this specification, the adhesive force with respect to the peeling film of an adhesive layer is the value measured by the method as described in the Example mentioned later.

<Surface protection film>

The surface protection film 30 may contain the base film 31 and the adhesive layer 32 laminated | stacked on it. The surface protection film 30 is a film for protecting the surface of the polarizing plate 10, and is usually peeled off together with the pressure-sensitive adhesive layer it has after the laminate is bonded to a display element or another optical member.

A surface protection film is generally elastic compared with a brightness improving film, and is important for the improvement of the peelability of a peeling film. In this specification, the thickness of a surface protection film is a total value of the thickness of a base film and the thickness of the adhesive layer laminated | stacked on it, Preferably it is 30 micrometers or more, More preferably, it is 50 micrometers or more. On the other hand, when the thickness of a surface protection film is too large, since peeling easily arises between a surface protection film and a polarizing plate at the time of peeling a peeling film, the thickness of a surface protection film becomes like this. Preferably it is 100 micrometers or less, More preferable Preferably it is 70 micrometers or less.

The base film is preferably a thermoplastic resin film. The thermoplastic resin constituting the thermoplastic resin film may be, for example, a polyolefin resin such as polyethylene resin or polypropylene resin; Cyclic polyolefin resins; Polyester resins such as polyethylene terephthalate and polyethylene naphthalate; Polycarbonate resins; (Meth) acrylic-type resin etc. are mentioned. The base film may have a single layer structure or a multilayered structure.

The thickness of the base film may be 20 to 150 μm (eg, 30 to 80 μm, preferably 30 to 60 μm). About the structure of an adhesive layer, the technique with respect to the adhesive layer which the above-mentioned polarizing plate has is quoted basically.

In particular, it is preferable that the storage elastic modulus of an adhesive layer is 0.15 Mpa or less at 80 degreeC, It is more preferable that it is 0.14 Mpa or less, It is still more preferable that it is 0.10 Mpa or less. Usually, the storage elastic modulus at 80 degreeC of an adhesive layer is 0.01 Mpa or more. In this specification, the storage elastic modulus of an adhesive layer can be measured using a commercially available viscoelasticity measuring apparatus, for example, the viscoelasticity measuring apparatus "DYNAMIC ANALYZER RDA II" by REOMETRIC.

The surface protection film 30 may contain an antistatic agent. An antistatic agent can be contained in an adhesive layer, for example. Instead of including the antistatic agent in the pressure-sensitive adhesive layer, or together with this, an antistatic layer containing the antistatic agent may be formed on the surface on the side opposite to the surface on which the pressure-sensitive adhesive layer in the base film is laminated.

An ionic compound is mentioned as an antistatic agent. An ionic compound is a compound which has an inorganic cation or an organic cation and an inorganic anion or an organic anion. You may use 2 or more types of ionic compounds.

<Peel film>

The peeling film 20 is a film temporarily bonded in order to protect the surface until the adhesive layer is bonded to a display element (for example, liquid crystal cell, organic electroluminescent element), or another optical member. The peeling film 20 can adjust the adhesive force with the adhesive layer 15 by performing the mold release process by mold release agents, such as a silicone type and a fluorine type, to single side | surface. The release film 20 is comprised from the thermoplastic resin film which carried out the mold release process, and an adhesive layer can be bonded to the mold release process surface.

The thermoplastic resin constituting the release film 20 may be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate. The thickness of the peeling film 20 is 10-50 micrometers, for example.

The laminated bodies 100-103 can peel the peeling film 20, and can be bonded to a display element (for example, a liquid crystal cell and an organic electroluminescent element). In addition, the surface protection film 30 may be peeled off and incorporated into a display device (eg, a liquid crystal display device, an organic EL display device). When constructing a display device, the laminate according to the present invention may be used for a polarizing plate disposed on the viewing side with respect to the display element, or may be used for a polarizing plate disposed on the side opposite to the viewing side. May be used for both polarizing plates on the opposite side.

<Method for Manufacturing Laminate>

A laminated body may be obtained by manufacturing a long laminated body by a roll-to-roll, conveying each member which comprises a laminated body, respectively, and cutting this, and preparing each member of a predetermined shape, respectively, and obtaining them sequentially. Also good.

The notching process, the punching process, the R process of the edge part can be performed using a planer process, an end mill process, etc. It is preferable that the processing means of a notch processing and a punching process is an end mill. An end mill is a kind of cutting tool. Unlike the drill which only processes in the axial direction (only for drilling), end mill processing can also process in the direction orthogonal to a rotating shaft. The planer processing refers to a process of cutting the processing surface in parallel by a protruding blade with a rotating shaft parallel to the processing surface. Specifically, the processing apparatus and processing method of Unexamined-Japanese-Patent No. 2018-22140 can be employ | adopted.

<Method of manufacturing polarizing plate with surface protective film>

As an example, FIG. 5 is taken as an example and the method of peeling a peeling film from the laminated body 104 is demonstrated. The surface of the surface protection film side in a laminated body is fixed to a holding stand, and the tape 200 is bonded on a peeling film. The fixing method of the laminated body 104 is not specifically limited, You may fix with the force attracted from the surface protection film side, and you may fix with adhesive force. It is preferable that it is 0.1-0.3 N / 60mm, and, as for the adhesive force between the surface protection film to fix and a holding stand, it is more preferable that it is 0.15-0.2N / 60mm. According to the laminated body of this invention, even if it fixes a laminated body by such a small pressure, favorable peelability is shown. The position at which the tape 200 is bonded may be, for example, an edge portion of one end of a short side having a cutout portion, as shown in FIG. 5.

Then, the tape 200 is raised and peeled off a peeling film. In FIG. 5, the angle θ formed between the short side orthogonal to the short side having the cutout and the peeling direction 400 of the tape may be 0 ° or more and 90 ° or less. When peeling off a peeling film by affixing a tape to the edge of one end of a short side which has a notch, when a peeling tip reaches a notch, especially when the peeling tip reaches the area | region 300 shown in FIG. Defects are likely to occur. That is, when a peeling tip is a corner part of the inside of a notch part, and it reaches the inner corner part of the side far from the position which stuck the tape, peeling defect is easy to generate | occur | produce. According to the present invention, even when the peeling tip reaches the cutout portion, peeling failure is unlikely to occur. In order to reduce the force which peels a peeling film in the area | region 300, it is preferable that angle (theta) is 25 degrees or more and 65 degrees or less. In addition, a peeling angle can be 90-180 degrees, and a peeling speed can be 0.1-10 m / min.

EXAMPLE

Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated further more concretely, this invention is not limited by these examples.

(1) measuring method of film thickness

It measured using MH-15M which is a digital micrometer by Nikon Corporation.

(2) Measuring method of adhesion

The adhesive force of the adhesive layer with which a peeling film and a polarizing plate is equipped was measured using Autograph (registered trademark) AGS-X which is a table-type precision universal testing machine manufactured by Shimadzu Corporation.

(3) Peeling force of the peeling film

The laminated body produced in each Example was fixed to the glass plate (holder) so that a surface protection film might become a lower side. The adhesive sheet was used for fixing, and the force (adhesive force) which fixed was 0.1-0.3 N / 60mm. As shown in FIG. 5, the tape was bonded to the edge part of one end of the short side which has a notch so that the long side direction of a tape may be parallel to the long side direction of a laminated body. The tape is No. 10, which is a polyester adhesive tape manufactured by Nitto Denko Corporation. 315 was used and width was 12 mm and the length of the joined part was 10 mm. One end of the tape was gripped with a chuck to release the release film. The angle (angle (theta) in FIG. 5) which the short side orthogonal to the peeling direction of a tape and the short side which has a notch made was 45 degrees. Peeling speed was 3 m / min, and peeling angle was 180 degrees. The peeling force during peeling of a peeling film was measured, and the maximum value of peeling force was calculated | required.

(4) Evaluation method of peelability of release film

The laminated body produced in each Example was fixed to the glass plate (holder) so that a surface protection film might become a lower side. The adhesive sheet was used for fixing, and the force (adhesive force) which fixed was 0.1-0.3 N / 60mm. As shown in FIG. 5, the tape was bonded to the edge part of one end of the short side which has a notch so that the long side direction of a tape may be parallel to the long side direction of a laminated body. The tape is No. 10, which is a polyester adhesive tape manufactured by Nitto Denko Corporation. 315 was used and width was 12 mm and the length of the joined part was 10 mm. One end of the tape was gripped with a chuck to release the release film. The angle (angle (theta) in FIG. 5) which the short side orthogonal to the peeling direction of a tape and the short side which has a notch made was 45 degrees. Peeling speed was 3 m / min, and peeling angle was 180 degrees. At this time, the case where the layer which consists of a polarizing plate and a surface protection film rises from the glass which fixed the laminated body is judged as peeling defect (NG), and peeling is favorable (OK) when the peeling film can be peeled off without being raised. Was determined.

[Production of Laminate]

A polarizer (thickness: 8 µm) in which iodine was adsorbed on a polyvinyl alcohol resin was prepared.

On one surface of this polarizer, the cyclic olefin resin (COP) film (25 micrometers in thickness) in which the hard-coat layer was formed was bonded through the ultraviolet curable adhesive agent, and the other surface of the polarizer was bonded through the same adhesive agent, An acetyl cellulose (TAC) film (thickness 20 μm) was bonded.

Then, the retardation film containing the layer which the polymeric liquid crystal compound hardened | cured was prepared. This retardation film has the laminated constitution which (lambda) / 4 plate (2 micrometers in thickness) and positive C plate (3 micrometers in thickness) were laminated | stacked through the ultraviolet curable adhesive agent (2 micrometers in thickness). Retardation film and TAC film were bonded together through the adhesive layer (5 micrometers in thickness) so that a (lambda) / 4 board and a TAC film might be a bonding surface mutually.

On the positive C plate, the acrylic adhesive layer (25 micrometers in thickness) formed on the peeling film was laminated | stacked. On the COP film, the base film which consists of polyester resin, and the surface protection film which consists of an acrylic adhesive layer were laminated | stacked.

The obtained film was cut out into the rectangle of 150 mm long side and 70 mm short side. The long side direction was parallel to the absorption axis of the polarizer. The laminate had a layer structure of a release film / adhesive layer / retardation layer (including two layers of a cured liquid crystal compound) / TAC film / polarizer / hard coat layer and a COP film / surface protective film. The thickness of the polarizing plate was 80 micrometers, the thickness of the release film was 38 micrometers, and the thickness of the surface protection film was 53 micrometers.

The adhesive force of an adhesive layer and a peeling film was 0.02 N / 25mm, and peeling was not observed between the adhesive layer which causes conveyance etc., and a peeling film.

Example 1

Notch processing was given to one short side of a laminated body by end mill processing. The shape of the notch part made depth d 2 mm, and made the curvature radius r of two inner corner parts 2 mm. The shape of the cutout part was the shape shown in FIG. 4 (d) as viewed from the top.

[Examples 2-15, Comparative Examples 1-11]

The laminated body was cut out similarly to Example 1 except having made the shape of a notch into the shape as shown in Table 1.

Comparative Example 12

The notch part was formed by cutting on one short side of a laminated body with a knife. R processing was not performed on two inner corner portions, and the two inner corner portions were each at right angles.

About the laminated body produced in the said Examples 1-15 and Comparative Examples 1-11, the maximum value of peeling force was measured, and peelability was evaluated. The results are shown in Table 1. As shown in Table 1, the laminated body of Examples 1-15 could perform peeling of a peeling film favorably. Moreover, also in any Example, the defect which peeled between a polarizing plate and a surface protection film did not generate | occur | produce. The laminated body of the comparative examples 1-12 was not able to peel easily a peeling film. The maximum value of the peeling force of the comparative example 12 was more than 1.0 N. On the other hand, in any laminated body, when the peeling tip reached the area | region 300 shown in FIG. 5, the maximum value of peeling force was recorded. That is, the maximum value of the peeling force was recorded when the peeling tip was an inner corner part of the notch part, and it reached the inner corner part of the side far from the position which stuck the tape.

This invention is useful because it can provide the laminated body which does not produce the peeling defect of a peeling film.

10: polarizer 11: polarizer
12: protective film 13: protective film
14: phase difference film 15: pressure-sensitive adhesive layer
16: adhesive layer 17: brightness enhancement film
20: release film 30: surface protective film
31: base film 32: pressure-sensitive adhesive layer
40: cutout 100: laminate
101: laminate 102: laminate
103: laminate 104: laminate
200: release tape 300: area
400: peeling direction

Claims (4)

The surface protection film is laminated | stacked on one side of a polarizing plate,
The release film is laminated on the other side of the polarizing plate,
The polarizing plate is a laminate comprising a polarizer,
The laminate has a cutout in plan view,
The laminated body whose maximum value of peeling force is 1.0 N or less when peeling the said peeling film from the short side which has the said notch. The laminated body of Claim 1 in which the shape of the said cutout part satisfies following formula (1).
r> 3d-14 (1)
[In Formula (1), d (mm) shows the depth of the said notch, and r (mm) shows the radius of curvature of the inner edge part in the said notch. " The said polarizing plate is equipped with an adhesive layer in the surface of the said peeling film side,
The laminated body whose adhesive force between the said peeling film and the said adhesive layer is 0.02 N / 25 mm or more and 0.10 N / 25 mm or less. The sticking process of sticking a tape to the edge part of the end of the short side which has a notch in the laminated body of any one of Claims 1-3,
A peeling step of raising the tape and peeling the release film from the laminate;
The said peeling process WHEREIN: The manufacturing method of the polarizing plate with a surface protection film whose angle which the peeling direction of a tape and the short side orthogonal to the short side which has a notch forms is 25 degrees or more and 65 degrees or less.

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