KR20210103479A - Optical film with adhesive layer, image display panel and image display device - Google Patents

Abstract

The optical film with an adhesive layer of this invention is an optical film with an adhesive layer using the side protection polarizing film which has a transparent protective film (however, retardation film is not included) on one side of a thin polarizer, The said adhesive layer is a predetermined monomer (a) contains 80 mass % or more as a monofunctional monomer unit, and contains 20 mass % or more of n-butyl acrylate in predetermined monomer (a), or 70 mass % of alkoxyalkyl (meth)acrylates A pressure-sensitive adhesive composition containing the (meth)acrylic polymer (A) contained above, further containing a silane coupling agent (B), having a polyether skeleton, and not containing a polyether compound having a reactive silyl group is formed with Even when placed in a humidified environment in a state in which fats and oils or cream components are in contact with the pressure-sensitive adhesive layer, peeling can be suppressed, and cracks generated in the transparent protective film of the polarizing film can be suppressed.

Description

Optical film with adhesive layer, image display panel and image display device

The present invention relates to an optical film with an adhesive layer. The optical film with an adhesive layer of this invention can be applied to an image display panel, The said image display panel can form image display apparatuses, such as a liquid crystal display device (LCD) and an organic electroluminescent display. Moreover, the said image display panel can be used as an image display panel with a bezel which provided the bezel as an outer frame on the outer side of an image display panel.

As for image display panels, such as a liquid crystal display panel, the polarizing film is arrange|positioned in image display parts, such as a liquid crystal cell, from the image formation system. In general, in an image display panel, at least a polarizing film is bonded to an image display part through an adhesive layer.

Usually, the adhesive containing a base polymer and a crosslinking agent is used for formation of the said adhesive layer. As the base polymer, an acrylic pressure-sensitive adhesive using an acrylic polymer is used. When bonding a polarizing film to an image display part, re-peelability (rework property) which can peel easily is calculated|required by such an adhesive even when a bonding position is wrong, or a foreign material mixes in a bonding surface. In addition, the pressure-sensitive adhesive layer is required to improve whitening (surrounding unevenness), durability, etc., in addition to reworkability. It is proposed to mix|blend a compound (patent document 1).

In addition, a bezel (outer frame) is usually provided on the outside of the image display panel from the viewpoint of handling properties and the like. In recent years, importance has been placed on design, and there is a tendency to narrow the bezel (Patent Documents 2 and 3).

Japanese Patent Laid-Open No. 2010-275522 Japanese Patent Laid-Open No. 2012-014000 Japanese Patent Laid-Open No. 2016-004214

When the image display panel in which the bezel is formed into a narrow frame is applied to an image display device such as a mobile phone, a cover glass or the like is disposed on the back surface of the image display panel. In this case, since a cover glass etc. are not normally arrange|positioned on the re-surface of the said image display panel, the intensity|strength of the visual recognition side surface of an image display panel cannot be said to be sufficient. As a countermeasure, for the purpose of preventing the image display panel from coming into direct contact with the main body of the image display device in the closed state when using a notebook computer or the like, an elastic body is provided, for example, on the top of the bezel. However, when the bezel is made into a narrow frame, it may be difficult to provide the elastic body above the bezel. Therefore, when a narrow framed bezel is used, a mode in which an elastic intermediate layer protruding from the outermost surface of the image display panel on the viewing side of the image display panel is provided between the end face and the bezel of the image display panel has also been studied.

In general, when opening and closing an image display panel in a notebook computer or the like, the outer edge of the image display panel is often touched with bare hands. On bare hands, there are oils and fats (oleic acid, etc.) based on sebum, and after using a moisturizing cream or sunscreen, the ingredients of these creams may remain on the bare hands. In such a case, when a notebook computer using an image display panel with a bezel provided with the elastic intermediate layer is opened and closed with bare hands, the oil or cream component is directly or indirectly attached to the image display unit along the elastic intermediate layer. There exists a possibility of reaching|attaining to the adhesive layer currently being carried out, and it turned out that the said adhesive layer absorbs the said component and expands. In particular, in a humidified environment, the adhesive layer which absorbed the said component becomes easy to expand, and peeling from the image display part of the said adhesive layer poses a problem. However, in the adhesive layer formed from the adhesive composition of the said patent document 1, the problem of the said peeling cannot be solved.

Moreover, the said adhesive layer swells with the fats and oils and cream component which reached the said adhesive layer, and the transparent protective film of the polarizing film bonding the said adhesive layer absorbs a fat and oil and a cream component and swells, transparent protection It was also found that whitening (generation of cracks) caused by cracking of the film occurred. Due to these problems, oils and fats and cream components easily intervene at the interface between the pressure-sensitive adhesive layer and the transparent protective film, and furthermore, deformation of the surface of the transparent protective film may occur. As a result, it also turned out that there exists a possibility of causing peeling of an adhesive layer and a transparent protective film.

The present invention is an optical film with a pressure-sensitive adhesive layer that can be applied to an image display panel or the like, and suppresses peeling of the pressure-sensitive adhesive layer even when oil or a cream component reaches the pressure-sensitive adhesive layer of the optical film with an adhesive layer under a humidified environment. Although it can suppress the crack which generate|occur|produces in the transparent protective film of the polarizing film contained in an optical film (it has crack resistance), it aims at providing providing the optical film with an adhesive layer.

Moreover, this invention aims at providing the image display panel using the said optical film with an adhesive layer, Furthermore, providing the image display apparatus using the said image display panel.

MEANS TO SOLVE THE PROBLEM As a result of repeating earnest examination in order to solve the said subject, the present inventors discovered that the said subject could be solved with the following optical film with an adhesive layer, etc., and came to complete this invention.

That is, this invention is an optical film with an adhesive layer which has an optical film and an adhesive layer,

The thickness of the optical film is 75㎛ or more,

The optical film includes a side protection polarizing film having a transparent protective film (provided, not including a retardation film) on one side of a polarizer having a thickness of 10 µm or less, and the pressure-sensitive adhesive layer is the transparent of the side protection polarizing film It is provided on the side that does not have a protective film,

The pressure-sensitive adhesive layer,

At least one monomer (a) selected from alkyl (meth) acrylate, alkoxyalkyl (meth) acrylate, fluorine-containing monomer, and acrylonitrile having an alkyl group having 1 to 4 carbon atoms is used as a monofunctional monomer unit 80 A (meth)acrylic polymer (A) containing 20% by mass or more of n-butyl acrylate as a monofunctional monomer unit, or 70% by mass or more of alkoxyalkyl (meth)acrylate It contains as a base polymer,

In addition, it contains a silane coupling agent (B),

It has a polyether skeleton and does not contain the polyether compound which has a reactive silyl group at at least one terminal, and it is formed from the adhesive composition, The image display panel with a bezel characterized by the above-mentioned.

Said optical film with an adhesive layer WHEREIN: As for the said adhesive layer, what is provided in the one-sided protection polarizing film through retardation film can be used.

Said optical film with an adhesive layer WHEREIN: As for the said adhesive layer, the thing directly provided in the polarizer of a one-sided protection polarizing film can be used.

The said optical film with an adhesive layer WHEREIN: It is suitable that the said optical film has a surface treatment layer in the outermost surface of the visual recognition side.

The said optical film with an adhesive layer WHEREIN: It is preferable that the thickness of the said optical film is 300 micrometers or less.

The said optical film with an adhesive layer WHEREIN: It is preferable that the thickness of the said adhesive layer is 10-30 micrometers.

Said optical film with an adhesive layer WHEREIN: The said adhesive layer is suitable also when an oleic acid swelling degree exceeds 130 % and is 190 % or less.

Said optical film with an adhesive layer WHEREIN: All said monomers (a) are alkyl (meth)acrylates which have the said C1-C4 alkyl group, and 30 mass % or more of n-butyl acrylate as said monomer unit. What contains can be used (Aspect (1)).

In the above aspect (1), all of the alkyl (meth)acrylates having an alkyl group having 1 to 4 carbon atoms are n-butyl acrylate, and contain 70 mass% or more of n-butyl acrylate as the monomer unit. (Aspect (10)) can be used.

Further, in the aspect (10), the alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms is an alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms (provided that n-butyl acrylate is excluded) and those containing n-butyl acrylate (Aspect (11)).

Furthermore, in the above aspect (11), as the monomer unit, 4 to 60% by mass of the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butylacrylate), n -What contains 30 mass % or more of butyl acrylate can be used.

Furthermore, in the above aspect (11), as the monomer unit, 15 to 60 mass% of the alkyl acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butyl acrylate), n-butyl acryl What contains a rate of 30 mass % or more can be used (Aspect (11A)).

Further, in the above aspect (11), as the monomer unit, one containing 5 to 15 mass% of the alkyl methacrylate having an alkyl group having 1 to 4 carbon atoms and 70 mass% or more of n-butyl acrylate can be used. There is (Aspect (11B)).

Further, in the optical film with an adhesive layer, the monomer (a) contains the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms and the fluorine-containing monomer, and as the monomer unit, the carbon number 1 -4 alkyl (meth)acrylate containing 30 mass % or more, fluorine-containing monomer 25 mass % or more, and containing 30 mass % or more of n-butyl acrylate can be used (Aspect ( 21)).

Further, in the optical film with an adhesive layer, the monomer (a) contains the alkyl (meth)acrylate and acrylonitrile having an alkyl group having 1 to 4 carbon atoms, and as the monomer unit, the monomer unit has 1 to carbon atoms. What contains 70 mass % or more of alkyl (meth)acrylate which has the alkyl group of 4, 5 mass % or more of acrylonitrile, and contains 70 mass % or more of n-butylacrylate can be used (mode (22) )).

Moreover, the said bezel-equipped image display panel WHEREIN: The thing containing the said alkoxyalkyl (meth)acrylate 70 mass % or more can be used for the said monomer (a) (mode (23)).

Said optical film with an adhesive layer WHEREIN: It is preferable that the said silane coupling agent (B) is at least 1 sort(s) chosen from an epoxy-group containing silane coupling agent (b1) and a mercapto group containing silane coupling agent (b2). It is preferable that the said epoxy group containing silane coupling agent (b1) is a low molecular-type epoxy group containing silane coupling agent (b1). Moreover, it is preferable that the said mercapto group containing silane coupling agent (b2) is an oligomer type mercapto group containing silane coupling agent (b2).

The said optical film with an adhesive layer WHEREIN: The said adhesive composition may contain a crosslinking agent.

Moreover, this invention has an image display part and the said optical film with an adhesive layer, It relates to the image display panel characterized by the above-mentioned. The said image display panel can be used in the aspect by which the said optical film with an adhesive layer is arrange|positioned through the adhesive layer of the said optical film with an adhesive layer on the visual recognition side of the said image display part.

Moreover, this invention relates to the liquid crystal display device which has the said image display panel.

Since the optical film with a pressure-sensitive adhesive layer of the present invention has an optical film having a thickness greater than or equal to a predetermined range, it is possible to prevent or to some extent prevent the oil or cream component from reaching and contacting the pressure-sensitive adhesive layer. Moreover, since the optical film with an adhesive layer of this invention contains the said adhesive layer as a base polymer the acrylic polymer which used the predetermined|prescribed monomer in a predetermined ratio or more, and forms with the adhesive layer containing a silane coupling agent, humidification Even when fats and oils or cream components reach the pressure-sensitive adhesive layer in the environment, peeling from the adherend due to swelling of the pressure-sensitive adhesive layer can be suppressed.

In addition, the optical film with a pressure-sensitive adhesive layer of the present invention uses, as a polarizing film, a side-protected polarizing film having a transparent protective film (however, does not include a retardation film) on one side of the polarizer, and the pressure-sensitive adhesive layer, Since the side protection polarizing film is provided on the side not having the transparent protective film, even when the pressure-sensitive adhesive layer absorbs oils and creams and swells in a humidified environment, a transparent protective film is provided on the side to which the pressure-sensitive adhesive layer is bonded. Since it does not have, generation|occurrence|production of the crack concerning a transparent protective film can be suppressed effectively. Moreover, since the said polarizer is a thin-shaped polarizer with a thickness of 10 micrometers or less, shrinkage|contraction of the polarizer in a humidified environment can be suppressed small, and peeling of a polarizer and an adhesive layer does not generate|occur|produce easily.

BRIEF DESCRIPTION OF THE DRAWINGS It is a part of sectional drawing which shows an example of the image display panel with a bezel to which the optical film with an adhesive layer of this invention can be applied.
Fig. 1B is a top view showing an example of the image display panel with bezel according to Fig. 1A.
It is a part of sectional drawing which shows an example of the image display panel with a bezel to which the optical film with an adhesive layer of this invention can be applied.
Fig. 2B is a top view showing an example of the image display panel with bezel according to Fig. 2A.
It is a part of sectional drawing which shows an example of the image display panel with a bezel to which the optical film with an adhesive layer of this invention can be applied.
Fig. 3B is a top view showing an example of the image display panel with bezel according to Fig. 3A.
4 is a top view showing an example of an elastic intermediate layer on a frame.
5 is a part of a cross-sectional view showing an example of an image display panel with a bezel according to a comparative example.

The image display panel to which the optical film with an adhesive layer of this invention can be applied below is demonstrated, referring drawings. Below, the case where an optical film with an adhesive layer is applied to an image display panel with a bezel is demonstrated.

For example, the image display panel with a bezel to which the optical film with an adhesive layer of this invention is applied, as shown in the sectional view of FIG. 1A, the adhesive layer ( It has an image display panel A having an optical film 2 disposed through 3), and an outer bezel 5 on the outside of the end face of the image display panel A. Fig. 1A is a part of a cross-sectional view showing an example of an image display panel with a bezel, in which the short side of one side is shown. 1B is a top view of an image display panel with a bezel to which the optical film with an adhesive layer of the present invention is applied. The outer bezel 5 is provided through the elastic intermediate layer 4 . The elastic intermediate layer 4 is provided so as to protrude from the visual display side outermost surface a of the image display panel A (optical film 2), and the outer bezel 5 is provided without covering the elastic intermediate layer 4 have. The end face of the image display panel A and the elastic intermediate layer 4 are formed from the viewpoint of narrowing the frame and enlargement of the display area, and also from the viewpoint of preventing intrusion of moisture, oil, and cream ingredients, and furthermore, the thickness of the entire image display device It is preferable to use it in the aspect contacting from a viewpoint of preventing the crack which arises from the edge part of an image display panel in the case of making thin. The outer bezel 5 may be fixed to the elastic intermediate layer 4 by an adhesive.

On the other hand, the end face of the image display panel A and the elastic intermediate layer 4 are provided with a gap S as shown in FIG. 2A from the viewpoint of simplifying the manufacturing process of inserting the panel into the housing can 2B is a top view of an image display panel with a bezel to which the optical film with an adhesive layer of the present invention is applied. It is preferable to provide the clearance gap S in the range of 2000 micrometers or less. When the gap S is provided, moisture, oil, and cream components easily penetrate into the gap S. However, according to the image display panel with a bezel of the present invention, peeling of the pressure-sensitive adhesive layer can be suppressed even when placed in a humidified environment. . In addition, irrespective of the presence or absence of the gap S, the end surface of the optical film 2 can be end-coated with an acrylic resin, a urethane-based resin, a silicone-based resin, a fluorine-based resin, or the like.

Moreover, as shown in the cross-sectional view of FIG. 3A, the image display panel with a bezel to which the optical film with an adhesive layer of this invention is applied is the aspect shown to the said FIG. 1A or 1B, Furthermore, the edge part of the said image display panel A In the face part, the inner bezel 6 may be provided on the outermost surface a on the inner side of the elastic intermediate layer 4 . 3B is a top view of an image display panel with a bezel to which the optical film with an adhesive layer of the present invention is applied. Also in this aspect, the said elastic intermediate|middle layer 4 is used in the aspect which protrudes rather than the said inner bezel 6. As shown in FIG. In the aspect shown in FIG. 3A, the case where the vacancy 7 is provided between the end surface of the said image display panel A and the said elastic intermediate|middle layer 4 is exemplified, but also in the aspect shown in FIG. 3A, the said image The end face of the display panel A and the elastic intermediate layer 4 can be used in an aspect in which they are in contact. When the vacant room 7 is provided in the aspect shown in FIG. 3A, accessories (camera lens, layout wiring, light control sensor, face recognition sensor, etc.) are arranged at the location of the said vacant room 7, and the inside of the upper surface It can be functionalized through the bezel (6). The inner bezel 6 can be fixed to the outermost surface a of the image display panel A and the elastic intermediate layer 4 by an adhesive.

In addition, the image display panel with a bezel to which the optical film with an adhesive layer of this invention is applied is the distance t (optical) from the outermost surface a on the visual recognition side of the said image display panel A (optical film 2) Corresponding to the thickness of the film 2) is set to 75 µm or more. When the distance t is less than 75 µm, it is difficult to suppress peeling of the pressure-sensitive adhesive layer 3 even under a humidified environment in which fats and oils or cream components may come into contact with the elastic intermediate layer. When the said distance t suppresses peeling of the adhesive layer 3, 100 micrometers or more are preferable, Furthermore, 120 micrometers or more are preferable. On the other hand, when the distance t becomes longer (that is, when the thickness of the optical film becomes thicker), the dimensional shrinkage of the optical film under a humidified environment tends to increase and warpage tends to occur. Therefore, the distance t is preferably 300 μm or less. Furthermore, it is preferable that it is 250 micrometers or less. The said distance t respond|corresponds to the thickness of an optical film, The thickness of the optical film in the optical film with an adhesive layer of this invention is 75 micrometers or more, On the other hand, it is preferable that thickness is 300 micrometers or less.

In addition, from the viewpoint of narrowing the frame of the image display panel with bezel, it is preferable that the widths of the outer bezel 5 and the elastic intermediate layer 4 are both small. The widths of the outer bezel 5 and the elastic intermediate layer 4 are appropriately set according to the size of the image display panel A, but usually, the width of the outer bezel 5 is 5 mm or less and 0.5 to 5 mm. It is preferable, and it is preferable that it is 0.5-3 mm further. Further, the width of the elastic intermediate layer 4 is 5 mm or less, preferably 0.5 to 5 mm, and further preferably 0.5 to 3 mm. In addition, it is preferable that the inner bezel 6 is also small from the viewpoint of narrowing the frame. Usually, it is preferable that the width of the inner bezel 6 is 1-20 mm, and it is further more preferable that it is 1-15 mm. Moreover, when providing the vacant room 7, it is preferable that the width is 1-20 mm, Furthermore, it is preferable that it is 1-15 mm. In the case of having the inner bezel 6, even when the oil or cream component comes into contact with the elastic intermediate layer 4, the possibility of reaching or contacting the pressure-sensitive adhesive layer 3 of the component is reduced, so that a vacancy ( 7), it is preferable that the width is 1 mm or more.

In addition, in the embodiment shown in Fig. 1A, the elastic intermediate layer 4 protrudes from the outermost surface a on the viewer side of the image display panel A (optical film 2), and in the embodiment shown in Fig. 3A , used in an aspect that protrudes from the inner bezel 6 . It can be avoided that an image display panel comes into direct contact with the main body of an image display apparatus by the said protrusion. It is preferable that the height of the said protrusion part is normally 0.5-5 mm, Furthermore, it is preferable that it is 0.5-3 mm. The elastic intermediate layer 4 is provided on the entire outer side of the end surface of the image display panel A in the top view shown in Fig. 1B and the top view shown in Fig. 3B, but the elastic intermediate layer 4 ) is used in at least a part, the present invention is effective.

Further, as shown in FIGS. 1A, 2A and 3A , a holding portion 41 for holding the image display panel A may be provided under the elastic intermediate layer 4 . The elastic intermediate layer 4 and the holding portion 41 may be integrally molded. The width of the holding portion 41 is preferably 5 mm or less, and preferably 3 mm or less, from the viewpoint of narrowing the frame width and weight reduction, etc. On the other hand, the width of the holding portion 41 (the width of the portion not in contact with the bottom of the elastic intermediate layer 4) is preferably 0.1 mm or more from the viewpoint of holding the image display panel A, further 0.3 mm or more. In Fig. 2, in the holding portion 41 of the elastic intermediate layer 4, a gap S is provided between the end face of the image display panel A and the elastic intermediate layer 4, and the edge portion of the image display panel A is Although the case of being held by the holding part 41 is exemplified, in the case of providing the gap S, the width of the gap S is greater than the width of the holding part 41 at a location not in contact with the bottom of the elastic intermediate layer 4 . It is desirable to design so that the width becomes long.

1B, 2B, and 3B, the elastic intermediate layer 4, the outer bezel 5, and the inner bezel 6 may be provided in a frame shape. In addition, as shown in Fig. 4, the elastic intermediate layer 4 is in the form of a frame ( Fig. 4 is a top view, so the case of having the holding portion 41 together with the elastic intermediate layer 4 is also described). In the case of use, some sides can be omitted from the viewpoint of handleability and the like. Further, on the inside of the elastic intermediate layer 4, it may have a convex portion 42 for fitting to be fixed to the housing. For example, in FIG. 4 , two convex portions 42 are provided on three sides on the inner side of the frame, respectively. The number of the said convex parts 42 can be set arbitrarily.

<External Bezel, Inner Bezel>

The outer bezel forms an outer frame on the outside of the end face of the image display panel to protect it, and it can be used without any particular limitation on what is usually applied to the image display panel. In addition, the inner bezel protects the outermost surface of the end face of the image display panel, and it can be used without any particular limitation on what is usually applied to the image display panel.

<Elastic intermediate layer>

As described above, the elastic intermediate layer is used to avoid direct contact between the image display panel and the main body of the image display device, and is not particularly limited as long as it is a material that can mitigate the impact caused by the contact when a notebook computer or the like is closed. Examples of the material for forming the elastic intermediate layer include nitrile rubber, fluororubber, urethane rubber, silicone rubber, ethylenepropylene rubber, hydrogenated nitrile rubber, chloroprene rubber, acrylic rubber, butyl rubber, and chlorosulfonated polyethylene, which are used for rubber packing and the like. , epichlorohydrin rubber, and a rubber material such as natural rubber can be used. In addition, as a material of an elastic intermediate|middle layer, elastic plastics, such as a vinyl chloride resin and a urethane resin, a cushion foam foam, etc. are mentioned, for example.

<Optical Film>

Hereinafter, the optical film of this invention is demonstrated. As mentioned above, the optical film of this invention contains a polarizing film. The optical film of this invention may be formed independently of a polarizing film, and may be formed as a laminated optical film which combined a polarizing film and another film. The thickness of the optical film (even in the case of a laminated optical film) is designed to satisfy 75 μm or more. Meanwhile, it is preferable to design the thickness to be 300 μm or less.

≪Polarizing film≫

As for the polarizing film contained in the said optical film, the one-sided protective polarizing film which has a transparent protective film (however, retardation film is not included) only on one side of a polarizer is used. In the said piece protection polarizing film, the said adhesive layer is provided in the side which does not have the said transparent protective film of the said piece protection polarizing film.

When the said adhesive layer is directly provided in the polarizer of a one-sided protection polarizing film, the laminated constitution (1) of a side protection polarizing film and an adhesive layer is shown below.

Layer composition (1): transparent protective film/polarizer/adhesive layer

In addition, when the said adhesive layer is provided in a side protection polarizing film through retardation film, the laminated constitution (2) of a side protection polarizing film and an adhesive layer is shown below.

Layer composition (2): transparent protective film/polarizer/retardation film/adhesive layer

The said polarizer is not specifically limited, Various things can be used. As the polarizer, for example, a dichroic substance such as iodine or a dichroic dye is adsorbed to a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, or an ethylene/vinyl acetate copolymer-based partially saponified film. and polyene-based oriented films such as those axially stretched, dehydrated products of polyvinyl alcohol, and dehydrochlorinated products of polyvinyl chloride. Among these, a polarizer containing a polyvinyl alcohol-based film and a dichroic substance such as iodine is suitable.

Moreover, as a polarizer, it is preferable to use the thin polarizer whose thickness is 10 micrometers or less. In particular, it is preferable to use a thin-shaped polarizer in the said side protection polarizing film. As for the thickness of a polarizer, it is preferable when it suppresses peeling of the adhesive layer by it being 3 micrometers or more by a fat and oil or a cream component. Moreover, it is preferable that the thickness of a polarizer is 10 micrometers or less from a viewpoint of suppressing dimensional contraction in a humidified environment. A thin polarizer having a thickness of 3 to 10 µm has little thickness variation, is excellent in visibility, and has few dimensional changes, so it is excellent in durability, and it is preferable that the thickness as a polarizing film is also reduced in thickness.

As a material constituting the transparent protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like is used. Specific examples of such a thermoplastic resin include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, and (meth)acrylic resins. Resin, cyclic polyolefin resin (norbornene-type resin), polyarylate resin, polystyrene resin, polyvinyl alcohol resin, and these mixtures are mentioned. In addition, on one side of the polarizer, a transparent protective film is bonded by an adhesive layer, but on the other side, as a transparent protective film, a thermosetting resin such as (meth)acrylic, urethane, acrylic urethane, epoxy, silicone, or ultraviolet curable resin. Can be used.

As a material of the said transparent protective film, a cellulose resin and a (meth)acrylic resin are preferable. As (meth)acrylic resin, it is preferable to use (meth)acrylic-type resin which has a lactone ring structure. As (meth)acrylic resin which has a lactone ring structure, Unexamined-Japanese-Patent No. 2000-230016, Unexamined-Japanese-Patent No. 2001-151814, Unexamined-Japanese-Patent No. 2002-120326, Unexamined-Japanese-Patent No. 2002-254544. (meth)acrylic-type resin which has a lactone ring structure as described in publication, Unexamined-Japanese-Patent No. 2005-146084, etc. are mentioned. In particular, compared with (meth)acrylic resin, a cellulose resin is preferable at the point effective in suppression of the polarizer crack which becomes a subject in the one-sided protective polarizing film which has a transparent protective film only on one side of a polarizer. Usually, it is preferable that the thickness of the said transparent protective film is 10-100 micrometers, Furthermore, it is preferable that it is 20-50 micrometers, Furthermore, it is preferable that it is 30-50 micrometers. In particular, when using a cellulose resin as a material of a transparent protective film, it is preferable to control thickness to 100 micrometers or less in suppressing the dimensional shrinkage in a humidified environment.

The transparent protective film does not include a retardation film. The transparent protective film not contained in the retardation film indicates that it is "optically isotropic", has an in-plane retardation Re(550) of 0 nm to 10 nm, and a retardation Rth(550) in the thickness direction of -10 nm to +10 nm say that it is

(Definition of terms and symbols)

Definitions of terms and symbols in the present specification are as follows.

(1) refractive index (nx, ny, nz)

"nx" is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction), "ny" is the refractive index in the direction orthogonal to the slow axis in the plane (that is, the fast axis direction), and "nz" is It is the refractive index in the thickness direction.

(2) In-plane phase difference (Re)

"Re(λ)" is the in-plane retardation of the film measured with the light of wavelength λnm at 23°C. For example, "Re(450)" is the in-plane retardation of the film measured with the light of wavelength 450nm in 23 degreeC. Re(λ) is obtained by the formula: Re=(nx-ny)×d when the thickness of the film is d (nm).

(3) retardation in thickness direction (Rth)

"Rth(λ)" is the retardation in the thickness direction of the film measured with the light of wavelength 550nm at 23 degreeC. For example, "Rth(450)" is the retardation of the thickness direction of the film measured with the light of wavelength 450nm in 23 degreeC. Rth(λ) is obtained by the formula: Rth=(nx-nz)×d when the thickness of the film is d (nm).

The adhesive used for bonding the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and various types of water-based, solvent-based, hot-melt-based, radical-curable, and cation-curable adhesives are used, but water-based adhesives or radical-curable adhesives are used. is suitable

≪Surface treatment layer≫

A surface treatment layer can be provided in the outermost surface of the said optical film. Functional layers, such as a hard-coat layer, a reflection prevention layer, a sticking prevention layer, a diffusion layer thru|or an anti-glare layer, are mentioned as a surface treatment layer. A surface treatment layer can be provided in the transparent protective film used for a polarizing film, and can also be provided in the base material separate from the said transparent protective film separately. As a separate substrate, the same thing as the transparent protective film can be used. When the surface treatment layer is provided as a separate body, it can be bonded to the polarizing film with a conventionally known pressure-sensitive adhesive layer or the like. The said surface treatment layer is the said polarizing film in the said optical film. WHEREIN: The said surface treatment layer is provided in the opposite side to the side which forms the said adhesive layer.

As a forming material of the hard-coat layer provided as the said surface treatment layer, a thermoplastic resin, a material hardened|cured by heat or radiation can be used, for example. As said material, radiation curable resin, such as thermosetting resin, ultraviolet curable resin, and electron beam curable resin, is mentioned. Among these, in the curing treatment by ultraviolet irradiation, an ultraviolet curable resin capable of efficiently forming a cured resin layer by a simple processing operation is suitable. As these curable resins, various things, such as a polyester type, acryl type, a urethane type, an amide type, a silicone type, an epoxy type, a melamine type, are mentioned, These monomers, an oligomer, a polymer, etc. are contained. A radiation curable resin, particularly an ultraviolet curable resin, is preferred from the viewpoint of a high processing speed and less heat damage to the substrate. The ultraviolet curable resin preferably used includes, for example, those containing an acrylic monomer or oligomer component having two or more, particularly three to six, of the functional group having an ultraviolet polymerizable functional group. Moreover, a photoinitiator is mix|blended with ultraviolet curable resin.

Moreover, as said surface treatment layer, the anti-glare treatment layer and antireflection layer for the purpose of improvement of visibility can be provided. Moreover, on the said hard-coat layer, an anti-glare process layer and a reflection prevention layer can be provided. It does not specifically limit as a structural material of an anti-glare treatment layer, For example, a radiation-curable resin, a thermosetting resin, a thermoplastic resin, etc. can be used. As the antireflection layer, titanium oxide, zirconium oxide, silicon oxide, magnesium fluoride, or the like is used. The antireflection layer can provide a plurality of layers. In addition, as a surface treatment layer, a sticking prevention layer etc. are mentioned.

≪Other floors≫

On the optical film (laminated optical film), a retardation film (including a wave plate such as 1/2 or 1/4), a visual compensation film, etc. may be laminated in addition to the respective layers. Moreover, in the said polarizing film or another optical layer, an anchor layer and an easily bonding layer can be provided, or various adhesion-facilitating processes, such as a corona treatment and a plasma treatment, can be given.

As shown in the said layer structure (2), the said adhesive layer can be provided in the one-sided protection polarizing film through retardation film. Examples of the retardation film include a birefringent film formed by subjecting a polymer material to uniaxial or biaxial stretching treatment, an alignment film of a liquid crystal polymer, and a film in which an alignment layer of a liquid crystal polymer is supported by a film. These retardation films can combine one layer individually or two or more layers.

Retardation film, when applying the optical film with an adhesive layer to the image display panel for PCs, from viewpoints of viewing angle compensation, low reflectance, etc., it is suitable to provide between a polarizer and an image display part, The said transparent protective film is differentiated from In addition, the retardation film can generally be used with a thickness of 4 to 150 µm, but the thickness is thinner in an appropriate range to suppress peeling of the pressure-sensitive adhesive layer in a humidified environment or to suppress cracks in the retardation film. It is advantageous, and for example, the thickness (total) of retardation film is 2-25 micrometers, Furthermore, it is preferable that it is 4-24 micrometers.

<Adhesive layer>

Hereinafter, the adhesive layer in the said optical film with an adhesive layer is demonstrated. The pressure-sensitive adhesive layer is, as a base polymer, at least one monomer selected from alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms, alkoxyalkyl (meth) acrylate, a fluorine-containing monomer, and acrylonitrile ( 80% by mass or more of a) as a monofunctional monomer unit, and 20% by mass or more of n-butyl acrylate as a monomer unit, or 70% by mass or more of alkoxyalkyl (meth)acrylate (meth) ) is formed of a pressure-sensitive adhesive composition containing an acrylic polymer (A). The said monofunctional monomer unit is a unit of the compound which comprises one (meth)acrylic-type polymer (A) and has one unsaturated double bond, such as a (meth)acryloyl group and a vinyl group. The (meth)acrylic polymer (A) includes a partial polymer of the monomer component containing the alkyl (meth)acrylate (a) and/or a (meth)acrylic polymer obtained from the monomer component. In addition, (meth)acrylate means an acrylate and/or a methacrylate, and has the same meaning as (meth) of this invention.

The main skeleton of the (meth)acrylic polymer (A) is selected from alkyl (meth)acrylates having an alkyl group having 1 to 4 carbon atoms, alkoxyalkyl (meth)acrylates, fluorine-containing monomers, and acrylonitrile It is formed from at least 1 sort(s) of monomer (a). The mass ratio of the monomer (a) is, as the monomer unit, 80 mass% or more in the mass ratio of all constituent monomers constituting the (meth)acrylic polymer (A) (monofunctional monomer 100% by mass, hereinafter the same) And, by using the (meth)acrylic polymer (A) of such a ratio, peeling of the said adhesive layer by fats and oils or a cream component can be suppressed.

Examples of the alkyl group in the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms include a linear or branched alkyl group, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, n- A butyl group, an isobutyl group, t-butyl group, etc. are mentioned.

As said alkyl (meth)acrylate which has a C1-C4 alkyl group, the alkyl (meth)acrylate which has a C4 alkyl group is preferable, and n-butyl acrylate is especially preferable. n-butyl acrylate is a unit of an essential monomer constituting the (meth)acrylic polymer (A), and can constitute the monomer (a) only with n-butyl acrylate. The mass ratio of n-butyl acrylate is, as a monomer unit, 20 mass % or more in the mass ratio of all constituent monomers (100 mass % of monofunctional monomers) constituting the (meth)acrylic polymer (A), such a ratio By using the (meth)acrylic polymer (A) of (meth), peeling of the said adhesive layer by fats and oils or a cream component can be suppressed. The said mass ratio of n-butyl acrylate can use 30 mass % or more, 40 mass % or more can be used, 50 mass % or more can be used, Furthermore, 60 mass % or more can be used, Furthermore, 70 mass % or more can be used It can be used, further 80 mass % or more can be used, Furthermore, 90 mass % or more can be used.

Although the said alkoxyalkyl (meth)acrylate is not specifically limited, As said alkoxyalkyl group, it is preferable that it is a C3-C25 alkoxyalkyl group in total. For example, as said alkoxyalkyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 3-methoxypropyl (meth)acrylate, 3- Toxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, ethoxybutyl (meth)acrylate, etc. are mentioned, In addition, Alkoxypoly, such as methoxytriethylene glycol (meth)acrylate, Alkylene glycol etc. are mentioned, As a commercial item, methoxy polyethyleneglycol (meth)acrylate (Bisma MPE400A made from Osaka Yuki Chemical Industry Co., Ltd.), etc. are mentioned.

The fluorine-containing monomer is not particularly limited, but has a radically polymerizable carbon-carbon double bond such as a (meth)acryloyl group and a vinyl group, and has a C3 to C10 alkyl group substituted with at least one fluorine atom. can For example, as said fluorine-containing monomer, for example, 2,2,2-trifluoroethyl acrylate, 2-(perfluorohexyl) ethyl acrylate, 2,2,3,3,3-pentafluoro Ropropylacrylate, 2-(perfluorobutyl)ethyl acrylate, 3-perfluorobutyl-2-hydroxypropylacrylate, 3-perfluorohexyl-2-hydroxypropylacrylate, 3-( Perfluoro-3-methylbutyl)-2-hydroxypropyl acrylate, 1H,1H,3H-tetrafluoropropylacrylate, 1H,1H,5H-octafluoropentylacrylate, 1H,1H,7H- dodecafluoroheptyl acrylate, 1H-1-(trifluoromethyl)trifluoroethyl acrylate, 1H,1H,3H-hexafluorobutylacrylate, 1,2,2,2-tetrafluoro- 1-(trifluoromethyl)ethyl acrylate etc. are mentioned. In addition, among the said fluorine-containing monomers, those which have a hydroxyl group are not contained in the hydroxyl-group containing monomer mentioned later.

Further, as the monomer (a), at least one selected from an alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms, an alkoxyalkyl (meth) acrylate, a fluorine-containing monomer, and acrylonitrile is used. , All of the monomers (a) can be constituted by an alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms (Aspect (1)). In the case of this aspect (1), it is preferable to contain 30 mass % or more of n-butyl acrylate as said monomer units. This aspect (1) is preferable at the point which ensures heat and wet heat durability.

As the aspect (1) in which all of the above-mentioned alkyl (meth)acrylates having an alkyl group having 1 to 4 carbon atoms are used as the monomer (a), for example, all of the above-mentioned monomers (a) are n-butyl acrylate Aspect (10) formed only by In the case of this aspect (10), it is preferable to contain 70 mass % or more of n-butyl acrylate as said monomer unit. In this case, although the said monomer unit of n-butyl acrylate changes with the kind of a copolymerization monomer, a crosslinking agent, etc., 80 mass % or more, 90 mass % or more can be used, Furthermore, 95 mass % or more can be used. This aspect (10) is preferable at the point which ensures heat and wet heat durability.

Moreover, as aspect (1) which all use the alkyl (meth)acrylate which has the said C1-C4 alkyl group as said monomer (a), for example, n-butyl acrylate other than n-butyl acrylate Aspect (11) used in combination with the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms except for can be employed. As the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms except for n-butyl acrylate, an alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms and t-butyl acrylate are preferable. The alkyl (meth)acrylate having an alkyl group having 1 to 3 carbon atoms is preferably an alkyl (meth)acrylate having an alkyl group having 1 to 2 carbon atoms, such as methyl acrylate, methyl methacrylate, and ethyl acrylate. That is, in the aspect (11) used in combination with n-butyl acrylate and the monomer (a) excluding n-butyl acrylate, the monomer (a) is an alkyl (meth) acryl having an alkyl group having 1 to 3 carbon atoms. Preference is given to using lactate or t-butylacrylate, and n-butylacrylate. This aspect (11) is preferable from the point of oil resistance, workability, handling, and crack resistance.

In the case of aspect (11) of the said combined system, Preferably the said mass ratio of the said alkyl (meth)acrylate which has a C1-C3 alkyl group is 4-60 mass %, More preferably, it is 4-50 mass %. , more preferably 10 to 40 mass%, on the other hand, the mass ratio of n-butyl acrylate is preferably 30 mass% or more, more preferably 30 to 96 mass%, further preferably 40 to 90 mass% It is preferable to adjust to 80 mass % or more in total.

Furthermore, in the aspect (11) of the combined system, an alkyl acrylate is used as the alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butyl acrylate) ( In the case of 11A), Preferably the said mass ratio of the said alkyl acrylate is 15-60 mass %, More preferably, 15-45 mass %, More preferably, 20-40 mass %, On the other hand, n-butylacryl The said mass ratio of a rate becomes like this. Preferably it is 30 mass % or more, More preferably, it is 40-85 mass %, More preferably, it is 40-75 mass %, It is preferable to adjust to 80 mass % or more in total. This aspect (11A) is preferable in terms of oil resistance, workability, handling, and crack resistance.

Further, in the aspect (11) of the combined system, an alkyl methacrylate is used as the alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butyl acrylate) In the case of (11B), the mass ratio of the alkyl methacrylate is preferably 5 to 15 mass%, more preferably 5 to 10 mass%, while the mass ratio of n-butyl acrylate is 70 mass%. % or more, More preferably, it is 70 to 90 mass %, and it is preferable to adjust to 80 mass % or more in total. This aspect (11B) is preferable from the point of workability, handling, and crack resistance.

Moreover, as said monomer (a), the aspect (21) which uses together the said alkyl (meth)acrylate which has a C1-C4 alkyl group, and the said fluorine-containing monomer is employable, for example. In the case of aspect (21) of the combined system, the mass ratio of the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms is preferably 30 mass% or more, more preferably 30 to 55 mass%, Preferably 25 mass % or more of a fluorine-containing monomer, More preferably, it is 25-50 mass %, and it adjusts to 80 mass % or more in total, Furthermore, Preferably n-butyl acrylate is 30 mass % or more, More preferably, it is preferable to prepare at 30-55 mass %. This aspect (21) is preferable from the point of oil resistance.

Moreover, as said monomer (a), the aspect (22) which uses together the alkyl (meth)acrylate and acrylonitrile which have the said C1-C4 alkyl group, for example is employable. In the case of the aspect (22) of the combined system, the mass ratio of the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms is preferably 70 mass% or more, more preferably 70 to 85 mass%, acrylonitrile is preferably 5 mass% or more, more preferably 10 to 20 mass%, adjusted to 80 mass% or more in total, and n-butyl acrylate is preferably 70 mass% or more; More preferably, it is preferable to prepare at 70-85 mass %. This aspect (22) is preferable from the point of heat durability.

Moreover, as said monomer (a), the aspect (23) which uses 70 mass % or more of the said alkoxyalkyl (meth)acrylates, for example is employable. In the case of the said aspect (23), 80 mass % or more of alkoxyalkyl (meth)acrylates can be used 90 mass % or more, Furthermore, 100 mass % can be used. Moreover, in aspect (23), the alkyl (meth)acrylate which has the said C1-C4 alkyl group can be used together. Preferably the said mass ratio of the said alkyl (meth)acrylate which has the said C1-C4 alkyl group is 20 mass % or more, Preferably the said alkoxyalkyl (meth)acrylate is 70 mass % or more, More preferably, it is 70 It is preferable to set it as thru|or 99 mass %, to adjust to 80 mass % or more in total, and to prepare n-butyl acrylate to 20 mass % or more preferably. This aspect (23) is preferable from the point of high adhesive force and oil resistance.

Also in the aspects (21) to (23) of the combined system, in the range in which the n-butyl acrylate or the alkoxyalkyl (meth)acrylate satisfies the mass ratio, the alkyl group having 1 to 4 carbon atoms is The alkyl (meth)acrylate to have can use together monomers other than n-butyl acrylate. In particular, in the aspect (21), as the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms, in addition to n-butyl acrylate, an alkyl acrylate having an alkyl group having 1 to 3 carbon atoms is used. It can be employ|adopted preferably.

In addition, in the (meth)acrylic polymer (A), in addition to the monomer unit of the monomer (a), for the purpose of improving adhesiveness and heat resistance, a polymerizable polymer having an unsaturated double bond such as a (meth)acryloyl group or a vinyl group One or more types of copolymerization monomers having a functional group can be introduced by copolymerization. The said copolymerization monomer mass ratio is 20 mass % or less.

However, if the polymerization ratio of the alkyl (meth) acrylate having an alkyl group having 5 or more carbon atoms increases, it is not preferable from the viewpoint of suppressing peeling of the above-described adhesive, so the alkyl (meth) acrylate having an alkyl group having 5 or more carbon atoms is polymerized. The ratio is 20 mass% or less, further preferably 15 mass% or less, further preferably 10 mass% or less, further preferably 5 mass% or less, further preferably 3 mass% or less, further preferably 1 mass% or less preferred, and most preferred not to use it.

As said copolymerization monomer, aromatic ring containing (meth)acrylate can be used, for example. An aromatic ring containing (meth)acrylate is a compound containing an aromatic ring structure in the structure, and also containing a (meth)acryloyl group. As an aromatic ring, a benzene ring, a naphthalene ring, or a biphenyl ring is mentioned.

As a specific example of aromatic ring containing (meth)acrylate, For example, benzyl (meth)acrylate, phenyl (meth)acrylate, o-phenylphenol (meth)acrylate phenoxy (meth)acrylate, phenoxyethyl ( Meth) acrylate, phenoxypropyl (meth) acrylate, phenoxy diethylene glycol (meth) acrylate, ethylene oxide modified nonylphenol (meth) acrylate, ethylene oxide modified cresol (meth) acrylate, phenol ethylene oxide Seed modified (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, methoxybenzyl (meth) acrylate, chlorobenzyl (meth) acrylate, cresyl (meth) acrylate, police What has a benzene ring, such as tyryl (meth)acrylate; Hydroxyethylated β-naphthol acrylate, 2-naphthoethyl (meth) acrylate, 2-naphthoxyethyl acrylate, 2-(4-methoxy-1-naphthoxy) ethyl (meth) acrylate, etc. What has a naphthalene ring; What has a biphenyl ring, such as biphenyl (meth)acrylate, is mentioned.

As said aromatic ring containing (meth)acrylate, benzyl (meth)acrylate and phenoxyethyl (meth)acrylate are preferable, and especially phenoxyethyl (meth)acrylate is preferable from an adhesive characteristic and a durable point. .

The said mass ratio of aromatic ring containing (meth)acrylate is 20 mass % or less, 3-18 mass % is preferable, 5-16 mass % is further preferable, Furthermore, 10-14 mass % is preferable. When the mass ratio of aromatic ring containing (meth)acrylate is 3 mass % or more, when suppressing display nonuniformity, it is preferable.

Moreover, as said copolymerization monomer, functional group containing monomers, such as a hydroxyl group containing monomer, a carboxyl group containing monomer, and an amide group containing monomer, can be illustrated, for example.

A hydroxyl group-containing monomer is a compound which contains a hydroxyl group in the structure, and also contains polymerizable unsaturated double bonds, such as a (meth)acryloyl group and a vinyl group. Specific examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-hydroxyhexyl. Hydroxyalkyl (meth)acrylates, such as (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate and (4-hydroxymethylcyclohexyl)-methyl acrylate. Among the above-mentioned hydroxyl group-containing monomers, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferable from the viewpoint of durability, and 4-hydroxybutyl (meth)acrylate is particularly preferable. desirable.

A carboxyl group-containing monomer is a compound which contains a carboxyl group in the structure, and also contains polymerizable unsaturated double bonds, such as a (meth)acryloyl group and a vinyl group. Specific examples of the carboxyl group-containing monomer include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Among the carboxyl group-containing monomers, acrylic acid is preferable from the viewpoints of copolymerizability, price, and adhesive properties.

A hydroxyl group containing monomer and a carboxyl group containing monomer become reaction points with a crosslinking agent, when an adhesive composition contains a crosslinking agent. Since the hydroxyl group-containing monomer and the carboxyl group-containing monomer have rich reactivity with the intermolecular crosslinking agent, they are preferably used for improving the cohesiveness and heat resistance of the resulting pressure-sensitive adhesive layer.

It is preferable that the said mass ratio of a hydroxyl-group containing monomer is 3 mass % or less, 0.01-3 mass % is preferable, Furthermore, 0.1-2 mass % is preferable, Furthermore, 0.2-2 mass % is preferable. It is preferable from a viewpoint of bridge|crosslinking an adhesive layer, durability, and the point of an adhesive characteristic that the mass ratio of a hydroxyl-group containing monomer shall be 0.01 mass % or more. On the other hand, when it exceeds 3 mass %, it is unpreferable from a durable point.

It is preferable that the said mass ratio of a carboxyl group containing monomer is 10 mass % or less, 0.01-8 mass % is preferable, Furthermore, 0.05-6 mass % is preferable, Furthermore, 0.1-5 mass % is preferable. It is preferable from a durable point that the mass ratio of a carboxyl group containing monomer shall be 0.01 mass % or more.

An amide group-containing monomer is a compound which contains an amide group in the structure, and also contains polymerizable unsaturated double bonds, such as a (meth)acryloyl group and a vinyl group. Specific examples of the amide group-containing monomer include (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-isopropylacrylamide, N-methyl (meth) Acrylamide, N-butyl (meth) acrylamide, N-hexyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylol-N-propane (meth) acrylamide, aminomethyl (meth) acrylamide-based monomers such as acrylamide, aminoethyl (meth)acrylamide, mercaptomethyl (meth)acrylamide, and mercaptoethyl (meth)acrylamide; N-acryloyl heterocyclic monomers, such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; and N-vinyl group-containing lactam-based monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam. An amide group-containing monomer is preferable in order to suppress the increase of the surface resistance value with time (especially in a humidified environment), or to satisfy durability. Particularly, among the amide group-containing monomers, N-vinyl group-containing lactam-based monomers are particularly preferable.

When the said mass ratio of an amide group containing monomer becomes large, since there exists a tendency for anchoring property to an optical film to fall, it is preferable that it is 10 mass % or less, and, as for the said mass ratio, it is especially preferable that it is 5 mass % or less. It is preferable that it is 0.1 mass % or more from a viewpoint of suppressing the increase of the surface resistance value with time (particularly in a humidified environment). 0.3 mass % or more is preferable, and, as for the said mass ratio, it is further more preferable that it is 0.5 mass % or more.

As a specific example of other copolymerization monomers other than the above, it is; acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allylsulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, and sulfopropyl (meth)acrylate; Phosphoric acid group containing monomers, such as 2-hydroxyethyl acryloyl phosphate, etc. are mentioned.

Further, alkylaminoalkyl (meth)acrylates such as aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and t-butylaminoethyl (meth)acrylate; alkoxyalkyl (meth)acrylates such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyoctamethylenesuccinimide, etc. succinimide-based monomers; maleimide-based monomers such as N-cyclohexyl maleimide, N-isopropyl maleimide, N-lauryl maleimide and N-phenyl maleimide; N-methylitaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itaconimide Itaconimide-type monomers, such as mide|mid and N-lauril itaconimide, etc. are mentioned as a monomer example for the modification objective.

Further, examples of the modifying monomer include vinyl-based monomers such as vinyl acetate and vinyl propionate; epoxy group-containing (meth)acrylates such as glycidyl (meth)acrylate; glycol-based (meth)acrylates such as polyethylene glycol (meth)acrylate and polypropylene glycol (meth)acrylate; (meth)acrylate monomers, such as tetrahydrofurfuryl (meth)acrylate and silicone (meth)acrylate, etc. can also be used. Furthermore, isoprene, butadiene, isobutylene, vinyl ether, etc. are mentioned.

Moreover, as a monomer which can be copolymerized other than the above, the silane-type monomer containing a silicon atom, etc. are mentioned. Examples of the silane-based monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, and 8- Vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltri Ethoxysilane, 10-acryloyloxydecyl triethoxysilane, etc. are mentioned.

The ratio of the other copolymerized monomers in the (meth)acrylic polymer (A) is 0 to 10 mass by mass of the total constituent monomers (100% by mass of monofunctional monomers) of the (meth)acrylic polymer (A). %, more preferably about 0 to 7% by mass, and more preferably about 0 to 5% by mass.

In addition, as a copolymerization monomer, tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6- hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth) Acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth)) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta ( (meth)acryloyl groups such as esters of (meth)acrylic acid and polyhydric alcohols such as meth)acrylate, dipentaerythritol hexa(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate, A polyfunctional monomer having two or more unsaturated double bonds such as a vinyl group, or a (meth)acryloyl group, an unsaturated double bond such as a vinyl group, etc. Polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, etc. added more than one can also be used.

When using the polyfunctional monomer or the like as the copolymerized monomer, the polyfunctional monomer functions as a crosslinking component. Although the usage-amount of the said polyfunctional monomer varies with the molecular weight, the number of functional groups, etc., it is preferable to use it at 1 mass part or less with respect to a total of 100 mass parts of monofunctional monomers, and 0.5 mass part or less is more preferable. Moreover, although it does not specifically limit as a lower limit, It is preferable that it is 0 mass part or more, and it is more preferable that it is 0.01 mass part or more. When the usage-amount of a polyfunctional monomer is within the said range, adhesive force can be improved.

It is preferable that the weight average molecular weights of the (meth)acrylic-type polymer (A) of this invention are 1 million - 2.5 million normally. When durability, especially heat resistance is considered, it is preferable that a weight average molecular weight is 1.2 million-2 million. It is preferable from a heat resistant point that a weight average molecular weight is 1 million or more. Moreover, when a weight average molecular weight becomes larger than 2.5 million, there exists a tendency for an adhesive to become hard easily, and peeling will become easy to generate|occur|produce. Moreover, it is preferable that they are 1.8 or more and 10 or less, as for the weight average molecular weight (Mw)/number average molecular weight (Mn) which shows molecular weight distribution, it is further 1.8-7, Furthermore, it is preferable that it is 1.8-5. When molecular weight distribution (Mw/Mn) exceeds 10, it is unpreferable from a durability point. In addition, a weight average molecular weight and molecular weight distribution (Mw/Mn) are measured by GPC (gel permeation chromatography), and are calculated|required from the value computed by polystyrene conversion.

For the production of such a (meth)acrylic polymer (A), known production methods such as various radical polymerizations such as solution polymerization, bulk polymerization, emulsion polymerization, and radiation (UV) polymerization can be appropriately selected. In addition, any of a random copolymer, a block copolymer, a graft copolymer, etc. may be sufficient as the (meth)acrylic-type polymer (A) obtained.

In addition, in solution polymerization, ethyl acetate, toluene, etc. are used as a polymerization solvent, for example. As a specific example of solution polymerization, reaction is performed under reaction conditions of about 5 to 30 hours at about 50-70 degreeC normally, adding a polymerization initiator under inert gas stream, such as nitrogen.

The polymerization initiator, chain transfer agent, emulsifier, etc. used for radical polymerization are not specifically limited, It can select suitably and can use it. In addition, the weight average molecular weight of a (meth)acrylic-type polymer (A) is controllable with the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, The usage-amount is adjusted timely according to these types.

Moreover, the adhesive composition which forms the adhesive layer of this invention contains a silane coupling agent (B) as an additive. By using the silane coupling agent (B) in combination with the (meth)acrylic polymer (A) containing 80% by mass or more of the alkyl (meth)acrylate (a) having an alkyl group having 1 to 4 carbon atoms as a monomer unit. , it is possible to suppress peeling of the pressure-sensitive adhesive layer due to the oil or cream component.

As said silane coupling agent (B), it is preferable to use at least 1 sort(s) chosen from an epoxy group containing silane coupling agent (b1) and a mercapto group containing silane coupling agent (b2).

Examples of the epoxy group-containing silane coupling agent (b1) include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2-( A silane coupling agent containing a low molecular weight type (vioigomeric type) epoxy group, such as 3,4-epoxycyclohexyl)ethyltrimethoxysilane, and X-41-1053, X-41-1056, X- manufactured by Shin-Etsu Chemical Co., Ltd. An oligomer type epoxy group containing silane coupling agent, such as 41-1059A, X-24-9590, and KR-516, is mentioned. Since the said epoxy group-containing silane coupling agent (b1) has a large effect of suppressing peeling of the pressure-sensitive adhesive layer by oils and fats or cream components, a low molecular weight (non-oligomer type) epoxy group-containing silane coupling agent is preferable.

Further, as the mercapto group-containing silane coupling agent (b2), 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropylmethyl Low molecular weight types such as diethoxysilane, β-mercaptomethylphenylethyltrimethoxysilane, mercaptomethyltrimethoxysilane, 6-mercaptohexyltrimethoxysilane, and 10-mercaptodecyltrimethoxysilane (violigomer type) ) A mercapto group-containing silane coupling agent, X-41-1805, X-41-1810, X-41-1818 by Shin-Etsu Chemical Co., Ltd. are mentioned. Since the said mercapto group-containing silane coupling agent (b2) has a large effect of suppressing peeling of the pressure-sensitive adhesive layer by a fat or cream component, an oligomer-type mercapto group-containing silane coupling agent is preferable.

Moreover, as a low molecular-type silane coupling agent (B) other than the above, For example, acetoacetyl group containing silane coupling agents, such as A100 by Soken Chemical; 3-Aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethylbutylidene)propylamine, N an amino group-containing silane coupling agent such as -phenyl-γ-aminopropyltrimethoxysilane; (meth)acryl group-containing silane coupling agents such as 3-acryloxypropyltrimethoxysilane and 3-methacryloxypropyltriethoxysilane; Isocyanate group containing silane coupling agents, such as 3-isocyanate propyl triethoxysilane, etc. are mentioned. Moreover, as an oligomer type silane coupling agent other than the above, KR-213 by Shin-Etsu Chemical Co., Ltd. etc. is mentioned, for example.

The silane coupling agent which has a some alkoxysilyl group in these molecule|numerators is difficult to volatilize, and since it has a plurality of alkoxysilyl groups, it is effective and preferable for durability improvement. In particular, durability is suitable even when the to-be-adhered body of an optical film with an adhesive is a transparent conductive layer (for example, ITO etc.) with which an alkoxysilyl group is hard to react compared with glass. In addition, an oligomer type refers to the polymer of about dimer or more and less than 100 mer of monomers, and as a weight average molecular weight of an oligomer type silane coupling agent, about 300-30000 is preferable.

Although the said silane coupling agent (B) may be used individually, respectively, and may mix and use 2 or more types, content as a whole is 0.01-5 mass with respect to 100 mass parts of said (meth)acrylic-type polymers (A). Addition is preferable, further preferably 0.02-3 mass parts, further more preferably 0.05-1 mass part, furthermore, 0.1-0.8 mass part is preferable. Moreover, as mentioned above, it is preferable to use at least 1 sort(s) chosen from an epoxy group containing silane coupling agent (b1) and a mercapto group containing silane coupling agent (b2) as said silane coupling agent (B), These silane coupling agents (b1), (b2), and when using together another silane coupling agent, another silane coupling agent is 3 mass parts or less with respect to 100 mass parts of said (meth)acrylic-type polymers (A), Furthermore, the said silane It can be used in the same amount or less as a coupling agent (B).

The pressure-sensitive adhesive composition of the present invention may contain a crosslinking agent (C). As the crosslinking agent (C), an organic crosslinking agent or a polyfunctional metal chelate can be used. As an organic crosslinking agent, an isocyanate type crosslinking agent, a peroxide type crosslinking agent, an epoxy type crosslinking agent, an imine type crosslinking agent, etc. are mentioned. A polyfunctional metal chelate is one in which a polyvalent metal is covalently bonded or coordinated with an organic compound. Examples of the polyvalent metal atom include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. have. Examples of the atom in the organic compound to be covalently bonded or coordinated include an oxygen atom, and examples of the organic compound include an alkyl ester, an alcohol compound, a carboxylic acid compound, an ether compound, and a ketone compound.

As said crosslinking agent (C), an isocyanate type crosslinking agent is preferable. As the isocyanate-based crosslinking agent, a compound having at least two isocyanate groups can be used. For example, well-known aliphatic polyisocyanate, alicyclic polyisocyanate, aromatic polyisocyanate, etc. which are generally used for urethanation reaction are used.

The amount of the crosslinking agent (C) used is preferably 3 parts by mass or less, more preferably 0.01 to 3 parts by mass, and further preferably 0.02 to 2 parts by mass, with respect to 100 parts by mass of the (meth)acrylic polymer (A). 0.03-1 mass part is preferable. In addition, when the amount of the crosslinking agent (C) is less than 0.01 parts by mass, the pressure-sensitive adhesive becomes insufficient crosslinking, and there is a fear that durability and adhesive properties cannot be satisfied. this looks

Further, the pressure-sensitive adhesive composition of the present invention may contain other known additives, for example, an antistatic agent, a colorant, powder such as a pigment, a dye, a surfactant, a plasticizer, a tackifier, a surface lubricant, a leveling agent, a softening agent , antioxidant, anti-aging agent, light stabilizer, ultraviolet absorber, polymerization inhibitor, inorganic or organic filler, metal powder, particulate, thin material, etc. can be appropriately added depending on the intended use. In addition, within the controllable range, you may employ|adopt the redox system which added the reducing agent. It is preferable to use these additives in 5 mass parts or less with respect to 100 mass parts of (meth)acrylic-type polymer (A), Furthermore, 3 mass parts or less, Furthermore, it is preferable to use in 1 mass part or less.

On the other hand, in the adhesive composition of this invention, it does not contain the polyether compound which has a polyether skeleton and has a reactive silyl group in at least 1 terminal. As for the polyether compound which has the said reactive silyl group, what is disclosed by Unexamined-Japanese-Patent No. 2010-275522 can be illustrated, for example. Although the polyether compound which has the said reactive silyl group is preferable at the point which can improve rework property, it is unpreferable from a viewpoint of suppressing peeling of the adhesive layer by fats and oils or a cream component. When the polyether compound which has the said reactive silyl group is used, even if the said silane coupling agent (B) is used, peeling of the said adhesive layer cannot be suppressed.

The adhesive layer of this invention can be used as an optical film with an adhesive layer bonded to the optical film (at least 1 sheet of polarizing film is contained). The said optical film with an adhesive layer can be obtained by forming an adhesive layer in at least single side|surface of an optical film with the said adhesive composition.

As a method of forming the pressure-sensitive adhesive layer, for example, the pressure-sensitive adhesive composition is applied to a peeling-treated separator or the like, the polymerization solvent is dried and removed to form the pressure-sensitive adhesive layer, and then transferred to an optical film (polarizing film), or It is produced by the method of apply|coating the said adhesive composition to an optical film (polarizing film), drying-removing a polymerization solvent etc., and forming an adhesive layer on an optical film, etc. In addition, at the time of application|coating of an adhesive, you may newly add 1 or more types of solvents other than a polymerization solvent suitably.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but when it becomes thin, the adhesiveness with the image display unit decreases or peeling tends to occur during heat shrinkage. Since it becomes easy to absorb into and peels off easily, for example, it is preferable that it is about 10-30 micrometers, and it is further more preferable that it is 15-20 micrometers.

As for the said adhesive layer, oleic acid swelling degree is 100 mass % or more normally, and the influence received from oleic acid is small, so that an oleic acid swelling degree is small. According to the optical film with a pressure-sensitive adhesive layer of the present invention, when the swelling degree of oleic acid of the pressure-sensitive adhesive layer exceeds 130%, even when it is 140% or more, and furthermore, even when it is 150% or more, the influence of oils and fats or cream components on the pressure-sensitive adhesive layer can be suppressed small. can Moreover, when the swelling degree of oleic acid of an adhesive layer exceeds 130 %, an adhesive layer can absorb fats and oils and a cream component, and can make small the influence on another optical member. On the other hand, when the swelling degree of oleic acid of the pressure-sensitive adhesive layer increases, the influence of oils and fats and cream components on the pressure-sensitive adhesive layer also increases. Therefore, the swelling degree of oleic acid is preferably 190% or less, and preferably 180% or less.

<Image display unit>

An image display part forms a part of an image display apparatus with the optical film (at least 1 sheet of polarizing film is contained) in the said optical film with an adhesive layer, As an image display apparatus, As an image display apparatus, a liquid crystal display device, organic EL ( electroluminescence) display device, PDP (plasma display panel), electronic paper, and the like.

As said image display part, the liquid crystal cell used for a liquid crystal display device can be illustrated. As a liquid crystal cell, the thing of arbitrary types, such as a TN type, an STN type, (pi) type, a VA type, and an IPS type, can be used, for example.

<Image display panel>

In addition to the said optical film, another optical film can be laminated|stacked and used for formation of an image display panel according to the aptitude of each arrangement|positioning location. For example, in a liquid crystal display panel, although a polarizing film is arrange|positioned at least on the opposite side with respect to the visual recognition side of a liquid crystal cell, there is no restriction|limiting in particular in the said polarizing film. Moreover, as said other optical film, For example, liquid crystal display devices, such as a reflective plate, a transflective plate, retardation film (including a wave plate such as 1/2 or 1/4), a visual compensation film, a brightness enhancement film, etc. What becomes an optical layer which may be used for formation is mentioned. These can be used in one layer or two or more layers.

<Image display device>

Formation of various image display apparatuses, such as a liquid crystal display device of this invention, can be performed according to the prior art. It is formed by appropriately assembling components, such as a lighting system, as needed, and embedding a drive circuit. In general, a liquid crystal display device incorporates a driving circuit by appropriately assembling components such as a liquid crystal cell (composition of a glass substrate/liquid crystal layer/glass substrate), a polarizing film disposed on both sides thereof, and, if necessary, an illumination system. formed by doing The said optical film is arrange|positioned at the visual recognition side, and another polarizing film is arrange|positioned at the other side. In addition, a suitable liquid crystal display device, such as one using a backlight or a reflecting plate for an illumination system, can be formed in a liquid crystal display device. In the case of forming a liquid crystal display device, for example, one or two or more layers of suitable components such as a diffusion plate, an anti-glare layer, an anti-reflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, and a backlight are disposed at appropriate positions. can be placed

Example

Hereinafter, the present invention will be specifically described with reference to production examples and examples, but the present invention is not limited by these examples. In addition, all parts and % in each example are based on weight. All room temperature leaving conditions not specifically prescribed|regulated below are 23 degreeC and 65%RH.

<Measurement of weight average molecular weight of (meth)acrylic polymer (A)>

The weight average molecular weight (Mw) of the (meth)acrylic polymer was measured by GPC (gel permeation chromatography). Mw/Mn was also measured similarly.

Analysis device: Tosoh Corporation, HLC-8120GPC

·Column: Tosoh Corporation, G7000H _XL +GMH _XL +GMH _XL

·Column size: 7.8 mm φ × 30 cm each, 90 cm in total

·Column temperature: 40℃

Flow rate: 0.8 mL/min

・Injection amount: 100μL

·Eluent: tetrahydrofuran

Detector: Differential Refractometer (RI)

・Standard sample: polystyrene

<Preparation of optical film>

Optical films A to D used in Examples, Comparative Examples and Reference Examples were prepared as follows.

(Production of thin polarizer)

Amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 µm) having a water absorption rate of 0.75% and a Tg of 75 ° C. One side of the substrate is corona treated, and the corona treated side is coated with polyvinyl alcohol (polymerization degree). 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, Nippon Kosei Chemical Co., Ltd., trade name "Gosepaimer Z200") 9:1 The aqueous solution contained in the ratio of was applied and dried at 25° C. to form a PVA-based resin layer having a thickness of 11 μm to prepare a laminate.

The obtained laminate was uniaxially stretched at the free end by 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 120°C (air-assisted stretching treatment).

Next, the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts of boric acid with respect to 100 parts of water) at a liquid temperature of 30°C for 30 seconds (insolubilization treatment).

Next, it was immersed in the dyeing bath with a liquid temperature of 30 degreeC, adjusting an iodine concentration and immersion time so that a polarizing plate might become a predetermined|prescribed transmittance|permeability. In this Example, 0.2 parts of iodine was mix|blended with respect to 100 parts of water, and it was made to immerse for 60 second in the iodine aqueous solution obtained by mix|blending 1.0 part of potassium iodide (dyeing process).

Next, it was immersed for 30 seconds in a crosslinking bath (a boric acid aqueous solution obtained by mix|blending 3 parts of potassium iodide with respect to 100 parts of water, and mix|blending 3 parts of boric acid) at a liquid temperature of 30 degreeC (crosslinking process).

Thereafter, while immersing the laminate in an aqueous solution of boric acid at a liquid temperature of 70°C (aqueous solution obtained by blending 4 parts of boric acid with respect to 100 parts of water and 5 parts of potassium iodide) while immersing the laminate in the longitudinal direction (long uniaxial stretching was performed so that the total draw ratio became 5.5 times (underwater stretching treatment).

Then, the laminated body was immersed in the washing|cleaning bath (aqueous solution obtained by mix|blending 4 parts of potassium iodide with respect to 100 parts of water) with a liquid temperature of 30 degreeC (washing process).

By the above, the optical film laminated body containing the 5 micrometers-thick polarizer was obtained.

(Transparent protective film)

Acrylic film 1: The surface of a (meth)acrylic resin film having a lactone ring structure having a thickness of 40 µm was corona-treated and used.

TAC film: A triacetyl cellulose film having a thickness of 40 µm was used by saponification treatment.

COP Film 1: A cycloolefin-based resin film (trade name: ZF14-013, manufactured by Nippon Zeon Co., Ltd.) having a thickness of 13 µm was used.

COP film 2: A cycloolefin-based resin film (trade name: ZF14-013, manufactured by Nippon Zeon Co., Ltd.) having a thickness of 25 µm was used.

All of the transparent protective films were "optically isotropic", in-plane retardation Re(550) was 0 nm to 10 nm, and retardation Rth(550) in the thickness direction was -10 nm to +10 nm.

(Production of adhesive applied to transparent protective film)

10 parts of N-hydroxyethyl acrylamide, 30 parts of acryloylmorpholine, 45 parts of 1,9-nonanediol diacrylate, and an acrylic oligomer obtained by polymerizing (meth)acrylic monomer (ARUFONUP 1190, manufactured by Toagosei Co., Ltd.) 10 Part, 3 parts of a photoinitiator (IRGACURE 907, the BASF company make), 2 parts of polymerization initiators (KAYACURE DETX-S, the Nippon Kayaku company make) were mixed, and the ultraviolet curable adhesive was prepared.

(retardation film)

1st retardation film: An 18-micrometer-thick cyclic olefin type film (refractive index characteristic: nx>ny>nz, in-plane retardation: 116 nm) was used.

Second retardation film: A modified polyethylene film having a thickness of 6 µm (refractive index characteristics: nz>nx>ny, in-plane retardation: 35 nm) was used.

<One-sided protection polarizing film>

On the surface of the polarizer of the optical film laminate, the transparent protective film (thickness 40 µm: acrylic film 1 or TAC film) was laminated while applying the ultraviolet curable adhesive a so that the thickness of the adhesive layer after curing was 1 µm. Then, ultraviolet rays were irradiated as an active energy ray to harden the adhesive. Ultraviolet irradiation was performed using a gallium-encapsulated metal halide lamp, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illuminance: 1600 mW/cm 2 , cumulative irradiation amount 1000/mJ/cm 2 (wavelength 380 to 440 nm) was used, and the illuminance of ultraviolet rays was measured using a Sola-Check system manufactured by Solatell. Next, the amorphous PET base material was peeled off, and the 46-micrometer-thick piece protective polarizing film using the thin polarizer was produced.

The side protection polarizing film 1 using the said acrylic film 1 was used for preparation to the following side protection polarizing film with retardation film.

When the said TAC film was used, it used as it is as one side protection polarizing film 2.

<Partially protective polarizing film with retardation film>

On the side of the thin polarizer of the said partly protective polarizing film 1, the 1st retardation film and the 2nd retardation film were laminated|attached sequentially, and the 72-micrometer-thick partly protective polarizing film with retardation film was obtained. For bonding, an adhesive layer having a thickness of 1 μm was formed using the same UV curable adhesive a as described above. In addition, it was bonded so that the slow axis of the first retardation film formed an angle of 0° with respect to the absorption axis of the polarizer, and the slow axis of the second retardation film formed an angle of 90° with respect to the absorption axis of the polarizer.

<Production of positive protective polarizing film>

After bonding the COP film 1 (thickness 25 μm) while applying the UV curable adhesive a to the surface of the polarizer of the optical film laminate so that the thickness of the adhesive layer after curing becomes 1 μm, as an active energy ray, UV light was irradiated to cure the adhesive. Ultraviolet irradiation was performed using a gallium-encapsulated metal halide lamp, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illuminance: 1600 mW/cm 2 , cumulative irradiation amount 1000/mJ/cm 2 (wavelength 380 to 440 nm) was used, and the illuminance of ultraviolet rays was measured using a Sola-Check system manufactured by Solatell. Next, the amorphous PET substrate is peeled off, and the COP film 2 (thickness 13 μm) is bonded to the peeling surface with the adhesive, then cured in the same manner, and a 45 μm thick positive protective polarizing film using a thin polarizer. produced.

<Production of film with surface treatment layer: ARTAC: thickness 44 μm)>

A 4 µm-thick antireflection layer was formed on a 40 µm-thick triacetyl cellulose film by sputtering.

<Preparation of film with surface treatment layer: ARTAC: 84 µm in thickness>

An antireflection layer having a thickness of 4 µm was formed on the 80 µm-thick triacetyl cellulose film by sputtering.

<Preparation of film with surface treatment layer: LCTAC (thickness 42 µm)>

The liquid crystal retardation layer with a film thickness of 2 micrometers was formed on the 40-micrometer-thick triacetyl cellulose film by coating.

<Preparation of adhesive layer A>

(Preparation of acrylic polymer)

A monomer mixture containing 100 parts of n-butyl acrylate and 5 parts of acrylic acid was charged to a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler. In addition, with respect to 100 parts of the monomer mixture (solid content), 0.1 parts of 2,2'-azobisisobutyronitrile as a polymerization initiator were added together with 100 parts of ethyl acetate, and nitrogen gas was introduced while gently stirring to replace nitrogen. Then, the liquid temperature in a flask was maintained at 55 degreeC vicinity, the polymerization reaction was performed for 8 hours, and the solution of the acrylic polymer with a weight average molecular weight (Mw) of 1.6 million was prepared.

(Preparation of adhesive composition)

With respect to 100 parts of the solid content of the solution of the acrylic polymer obtained above, 0.45 parts of an isocyanate type crosslinking agent (Coronate L manufactured by Tosoh Corporation, trimethylolpropane tolylene diisocyanate) was mix|blended, and the solution of the acrylic adhesive composition was prepared.

(Formation of adhesive layer)

Next, the solution of the acrylic pressure-sensitive adhesive composition is applied to one side of a polyethylene terephthalate film (separator film: Mitsubishi Chemical Polyester Film Co., Ltd., MRF38) treated with a silicone-based release agent, the pressure-sensitive adhesive layer after drying has a thickness of 23 µm or It apply|coated so that it may become 12 micrometers, and it dried at 155 degreeC for 1 minute, and formed the adhesive layer A on the surface of the separator film.

The said polarizing film and the film with a surface treatment layer were laminated|stacked by the following structure, and optical films A-F were prepared. The said lamination|stacking was performed by bonding through the adhesive layer A on the triacetyl cellulose film side of a film with a surface treatment layer. In the lamination of the single protective polarizing film with retardation film, the pressure-sensitive adhesive layer A was bonded to the acrylic film 1 side. The lamination|stacking of the said side protection polarizing film 2 bonded the adhesive layer A to the TAC film side. The lamination|stacking of the said positive protective polarizing film bonded the adhesive layer A to the COP film 2 side.

Optical film A (128 micrometers in total thickness): ARTAC (44 micrometers in thickness)/adhesive layer A (12 micrometers in thickness)/partial protection polarizing film (72 micrometers in thickness) with retardation film.

Optical film B (179 micrometers in total thickness): ARTAC (84 micrometers in thickness)/adhesive layer A (23 micrometers in thickness)/partial protection polarizing film (72 micrometers in thickness) with retardation film.

Optical film C (total thickness 244 μm): ARTAC (thickness 84 μm)/Adhesive layer A (23 μm thick)/LCTAC (thickness 42 μm)/Adhesive layer A (23 μm thick)/Partially protective polarizing film with retardation film ( 72 μm thick).

Optical film D (72 µm in total thickness): Partially protective polarizing film with retardation film (72 µm in thickness).

Optical film E (total thickness 217 µm): ARTAC (84 µm in thickness)/Adhesive layer A (23 µm in thickness)/LCTAC (42 µm in thickness)/Adhesive layer A (23 µm in thickness)/Both protective polarizing film (45 µm in thickness) .

Optical film F (total thickness 244 µm): ARTAC (84 µm in thickness)/Adhesive layer A (23 µm in thickness)/LCTAC (42 µm in thickness)/Adhesive layer A (23 µm in thickness)/Partial protection polarizing film 2 (thickness 72) μm).

Example 1

(Preparation of acrylic polymer)

A monomer mixture containing 81.9 parts of n-butyl acrylate, 13.2 parts of benzyl acrylate, 0.1 parts of 4-hydroxybutyl acrylate, and 4.8 parts of acrylic acid in a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube and a cooler was put in. In addition, with respect to 100 parts of the monomer mixture (solid content), 0.1 parts of 2,2'-azobisisobutyronitrile as a polymerization initiator were added together with 100 parts of ethyl acetate, and nitrogen gas was introduced while gently stirring to replace nitrogen. Then, the liquid temperature in a flask was maintained at 55 degreeC vicinity, the polymerization reaction was performed for 8 hours, and the solution of the acrylic polymer with a weight average molecular weight (Mw) of 1.6 million was prepared.

(Preparation of adhesive composition)

With respect to 100 parts of the solid content of the acrylic polymer solution obtained above, 0.2 parts of an oligomer-type mercapto group-containing silane coupling agent (X-41-1810 manufactured by Shin-Etsu Chemical Co., Ltd.), an isocyanate-based crosslinking agent (Coronate L manufactured by Tosoh Corporation, Trimethylolpropane tolylene diisocyanate) 0.45 parts was mix|blended, and the solution of the acrylic adhesive composition was prepared.

(Formation of adhesive layer)

Next, the solution of the acrylic pressure-sensitive adhesive composition was applied to one side of a polyethylene terephthalate film (separator film: Mitsubishi Chemical Polyester Film Co., Ltd., MRF38) treated with a silicone-based release agent, the pressure-sensitive adhesive layer after drying to a thickness of 20 µm It apply|coated so that it may become possible, and it dried at 155 degreeC for 1 minute, and formed the adhesive layer B on the surface of a separator film.

(Preparation of an optical film with an adhesive layer, and preparation of an image display panel)

An image display unit (a liquid crystal cell including a diagonal 15-inch size: 300 µm in thickness) was prepared.

The pressure-sensitive adhesive layer B prepared above was bonded to the side of the single protective polarizing film with retardation film of the optical film A prepared above, and an optical film with an adhesive layer (a polarizing film shorter than the liquid crystal cell and shorter by 4 mm on both sides) prepared. After peeling a separator film from the said optical film with an adhesive layer, the said optical film A (2nd retardation film side) is bonded using a laminator to the visual recognition side of the said image display part through the said adhesive layer B, and an image is displayed A panel (liquid crystal display panel) was produced. Next, the autoclave process was carried out for 15 minutes at 50 degreeC and 0.5 Mpa, and the said optical film A was closely_contact|adhered to the image display part completely. Next, the obtained image display panel was laser cut and shape|molded to 15-inch size.

(Production of image display panel with bezel)

As an elastic intermediate layer, a rubber molded product having a width of 1 mm and a height of 5 mm, processed to fit the outer periphery of the image display panel (15-inch size) (the overall width of the holding support part is 1.5 mm, the convex parts are 6 places, the places shown in Fig. 4, An elastic intermediate layer (5 cm) was prepared from both sides on one side.

Further, as the outer bezel, a metal sputtered resin plate (frame) having a width of 1 mm and a height of 3 mm, molded to fit the image display panel (15-inch size), was prepared (a recess into which the panel can be inserted) integrated into the mold housing frame).

The elastic intermediate layer is formed in a housing in which the external bezel is integrated, and then the image display panel is embedded (a gap of 1 mm or less is provided), and the elastic intermediate layer is formed on the entire outer side of the end face of the image display device. , an image display panel with a bezel having the structure shown in FIG. 2 ( FIGS. 2A and 2B ), in which the outer bezels are sequentially installed, was manufactured. In the obtained image display panel with a bezel, it provided so that the elastic intermediate|middle layer may protrude 1 mm from the outermost surface on the visual recognition side of the said image display panel (optical film A). The elastic intermediate layer had a structure in contact with the end face of the image display panel. The outer bezel was fixed to the elastic intermediate layer with an adhesive.

Examples 2 to 32 and Comparative Examples 1 to 8

In Example 1, the composition or ratio of the monomer mixture used to prepare the acrylic polymer, the type or blending amount of the silane coupling agent used in the preparation of the pressure-sensitive adhesive composition, the type or blending amount of the crosslinking agent, or the thickness of the formed pressure-sensitive adhesive layer are shown in Table 1 Except having changed as shown, it carried out similarly to Example 1, and formed the adhesive layer B. Moreover, using the adhesive layer B obtained above, using the optical films A-F shown in Table 1, after carrying out similarly to Example 1 and preparing the optical film with an adhesive layer, the image display panel was produced. Moreover, it carried out similarly to Example 1, and produced the image display panel with a bezel.

Moreover, when the optical film E was used, the adhesive layer B was bonded together to the side protection polarizing film side, when the optical film F was used, and the adhesive layer-equipped optical film was prepared.

However, in Example 30, the image display panel with a bezel of the structure shown in FIG. 3 (FIG. 3A, FIG. 3B) was produced. In the image display panel with bezel, as the inner bezel, a metal sputtered resin plate (frame) having a width of 20 mm and a height of 2 mm, molded to fit the image display panel (15 inch size) was prepared and assembled. . The elastic intermediate layer provided a gap of 15 mm with the end face of the image display panel. For the outer bezel and the elastic intermediate layer, a size capable of securing the gap was used. The outer bezel was fixed to the elastic intermediate layer with an adhesive. The inner bezel was fixed to the end of the outermost surface of the image display panel and the elastic intermediate layer with an adhesive.

In addition, the adhesive composition used for formation of the adhesive layer of Comparative Example 3 was prepared by the following method.

To a monomer mixture consisting of 67 parts of 2-ethylhexyl acrylate (2EHA), 15 parts of 2-hydroxyethyl acrylate (HEA) and 18 parts of N-vinyl-2-pyrrolidone (NVP), 1-hydroxyl as a photopolymerization initiator 0.050 parts of oxycyclohexylphenylketone (trade name: Irgacure 184, manufactured by BASF) 0.050 parts of 2,2-dimethoxy-1,2-diphenylethan-1-one (trade name: Irgacure 651, manufactured by BASF) After blending, the prepolymer composition (polymerization rate) in which a part of the monomer component is polymerized by irradiation with ultraviolet light until the viscosity (measurement conditions: BH viscometer No. 5 rotor, 10 rpm, measurement temperature 30° C.) reaches about 20 Pa·s : 9%) was obtained. Next, 0.09 parts of hexanediol diacrylate (HDDA) was added and mixed to this prepolymer composition, and the adhesive composition was obtained. The said adhesive composition was apply|coated so that it might become 20 micrometers in thickness on the peeling-processed surface of the peeling film (brand name "MRF#38", Mitsubishi Jushi Co., Ltd. product), and the adhesive composition layer was formed. Next, the surface of the other pressure-sensitive adhesive composition layer and the peeling-treated surface of a release film (“MRN#38”, manufactured by Mitsubishi Jushi Co., Ltd.) were bonded together, and the illuminance: 4 mW/cm 2 , light quantity: 1200 mJ/cm 2 It was irradiated with ultraviolet rays under the conditions, it was photocured, the adhesive layer was formed, and the adhesive sheet was produced.

Reference example 1 (production of image display panel with cover glass and bezel)

Using the image display panel similar to the image display panel prepared in Example 1, the image display panel with a bezel of the structure shown in FIG. 5 was produced.

As an outer bezel, the same thing as that used in Example 1 was prepared.

As a cover glass, tempered glass having a thickness of 1500 µm and molded to fit the image display panel (15 inch size) was prepared.

The outer bezel was provided and assembled on the entire outer side of the end face of the image display panel. The outer bezel was fixed to the image display panel with an adhesive. The cover glass was bonded by an adhesive layer (LUCIACS CS9864 manufactured by Nitto Denko Corporation).

The following evaluation was performed about the optical film with an adhesive layer, and the image display panel with a bezel obtained by the said Example, a comparative example, and a reference example. An evaluation result is shown in Table 1.

<Drug test during humidification>

10 mL of the following chemical|medical agent was dripped using the 2 mL dropper to the inside (all) of the elastic intermediate|middle layer (external bezel in the reference example) of the obtained image display panel with a bezel.

Oleic acid: Oleic acid manufactured by Wako Pure Chemical Industries, Ltd. (class 1, containing 65%).

Vaseline moisturizing cream: UJ Body Milk COAB manufactured by Unilever (63% water, 26% glycerin).

Sunscreen: EDGEWELL PERSONAL CARE Banana Boat Sunscreen Lotion SPF 30.

After the chemical was dripped, the image display panel with bezel was stored at 65°C and 90%RH for 72 hours, and then left to stand at room temperature (23°C). Then, the optical film with an adhesive layer was taken out from the image display panel with a bezel, the external appearance was visually observed, and the following reference|standard evaluated peeling of the adhesive layer B.

(Evaluation standard)

(double-circle): No peeling.

(circle): No peeling, the edge part swelled up by adhesive swelling.

(triangle|delta): micro peeling of 0.5 mm or less.

NG: With peeling (Peeling: also described in Table 1 about mm).

<Measurement of oleic acid swelling degree>

The pressure-sensitive adhesive layer B formed on the surface of the separator film used in each example was cut to 20 mm x 40 mm to prepare a sample, and the mass (W1) was measured. Next, the sample was immersed in oleic acid at 60 DEG C and a humidity of 90% for 24 hours, the sample was taken out from the oleic acid, the surface of the sample was washed with ethanol, and then dried at 110 DEG C for 3 hours. The sample mass (W3) after drying was measured, and the oleic acid swelling ratio of an acrylic adhesive was computed using following formula (2). The mass (W2) of the separator film of the sample was measured separately.

Swelling rate (%) = {(W3-W2)/(W1-W2)} x 100

<Crack resistance>

10 mL of oleic acid was dripped using the 2 mL dropper to the inside (all) of the elastic intermediate layer (external bezel in the reference example) of the image display panel with a bezel similarly to the said <medical agent test at the time of humidification>. After the chemical was dripped, the image display panel with bezel was stored at 65°C and 90%RH for 72 hours, and then left to stand at room temperature (23°C).

After that, the optical film with an adhesive layer is taken out from the image display panel with a bezel, the adhesive layer of the said optical film with an adhesive layer is provided in the lower side, The presence or absence of generation|occurrence|production of the crack of the transparent protective film of a polarizing film from the upper side (cracking) It was observed with the naked eye under a microscope (10 times).

In addition, in the comparative example 8 (the example using a positive protective polarizing film), the side surface of the taken out optical film with an adhesive layer was visually observed. If any of the transparent protective films on both surfaces of the polarizer had a crack when viewed from the side, it was set as having a crack.

In Table 1,

MA: methyl acrylate,

EA: ethyl acrylate,

BA: n-butyl acrylate,

MMA: methyl methacrylate,

2EHA: 2-ethylhexyl acrylate,

viscot 3F: 2,2,2-trifluoroethyl acrylate,

BzA: benzyl acrylate,

4HBA: 4-hydroxybutyl acrylate,

HEA: 2-hydroxyethyl acrylate,

NVP: N-vinylpyrrolidone,

AA: acrylic acid,

MEA: methoxyethyl acrylate,

SAT10: Cyril SAT10 made by Kaneka Corporation,

KBM403: KBM-403 made by Shin-Etsu Chemical High School,

KBM573: KBM-573 made by Shin-Etsu Chemical High School,

A100: A100 (acetoacetyl group-containing silane coupling agent) manufactured by Soken Chemical Co., Ltd.;

X-41-1810: a silane coupling agent containing an oligomeric mercapto group manufactured by Shin-Etsu Chemical Co., Ltd.;

X-41-1056: a silane coupling agent containing an oligomeric epoxy group manufactured by Shin-Etsu Chemical Co., Ltd.;

C/HX: isocyanate-based crosslinking agent (Coronate HX manufactured by Tosoh Corporation, isocyanurate form of hexamethylene diisocyanate);

Tetrad C: Epoxy crosslinking agent (Mitsubishi Gas Chemical Co., Ltd. Tetrad C/1,3-bis(N,N-glycidylaminomethyl)cyclohexane);

C/L: isocyanate-based crosslinking agent (Coronate L manufactured by Tosoh Corporation, trimethylolpropantolylene diisocyanate);

D160N: isocyanate crosslinking agent (Takenate D160N manufactured by Mitsui Chemicals, trimethylolpropane hexamethylene diisocyanate)

HDDA: hexanediol diacrylate is shown.

A: On-screen display panel
1: Image display unit
2: Optical film (including polarizing film)
3: Adhesive layer (image display part side)
4: elastic interlayer
41: holding part
42: convex part
5: Outer bezel
6: Inner bezel
7: Vacancy
8: adhesive layer (cover glass side)
9: Cover glass
S: Gap

Claims (23)

It is an optical film with a pressure-sensitive adhesive layer having an optical film and a pressure-sensitive adhesive layer,
The thickness of the optical film is 75㎛ or more,
The optical film includes a side protection polarizing film having a transparent protective film (provided, not including a retardation film) on one side of a polarizer having a thickness of 10 µm or less, and the pressure-sensitive adhesive layer is the transparent of the side protection polarizing film It is provided on the side that does not have a protective film,
The pressure-sensitive adhesive layer,
At least one monomer (a) selected from alkyl (meth) acrylate, alkoxyalkyl (meth) acrylate, fluorine-containing monomer, and acrylonitrile having an alkyl group having 1 to 4 carbon atoms is used as a monofunctional monomer unit 80 A (meth)acrylic polymer (A) containing 20% by mass or more of n-butyl acrylate as a monofunctional monomer unit, or 70% by mass or more of alkoxyalkyl (meth)acrylate It contains as a base polymer,
In addition, it contains a silane coupling agent (B),
It has a polyether skeleton and does not contain the polyether compound which has a reactive silyl group in at least 1 terminal, It is formed from the adhesive composition, The optical film with an adhesive layer characterized by the above-mentioned. According to claim 1,
The said adhesive layer is provided in the one-sided protection polarizing film via retardation film, The optical film with an adhesive layer characterized by the above-mentioned. According to claim 1,
The said adhesive layer is directly provided in the polarizer of a one-sided protection polarizing film, The optical film with an adhesive layer characterized by the above-mentioned. 4. The method according to any one of claims 1 to 3,
Said optical film has a surface treatment layer on the outermost surface of the visual recognition side, The optical film with an adhesive layer characterized by the above-mentioned. 5. The method according to any one of claims 1 to 4,
The optical film having a pressure-sensitive adhesive layer, characterized in that the thickness of the optical film is 300㎛ or less. 6. The method according to any one of claims 1 to 5,
An optical film with a pressure-sensitive adhesive layer, characterized in that the thickness of the pressure-sensitive adhesive layer is 10 to 30㎛. 7. The method according to any one of claims 1 to 6,
The pressure-sensitive adhesive layer has an oleic acid swelling degree of more than 130% and 190% or less, an optical film with a pressure-sensitive adhesive layer. 8. The method according to any one of claims 1 to 7,
All of the monomers (a) are alkyl (meth)acrylates having an alkyl group having 1 to 4 carbon atoms, and as the monomer unit, n-butyl acrylate is contained in an amount of 30% by mass or more. optical film. 9. The method of claim 8,
All of the alkyl (meth)acrylates having an alkyl group having 1 to 4 carbon atoms are n-butyl acrylate, and as the monomer unit, n-butyl acrylate is contained in an amount of 70 mass% or more. optical film. 9. The method of claim 8,
The alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms is an alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butyl acrylate) and n-butyl acrylate It contains an optical film with an adhesive layer characterized by the above-mentioned. 11. The method of claim 10,
As the monomer unit, 4 to 60 mass % of the alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butyl acrylate), and 30 mass % or more of n-butyl acrylate An optical film with a pressure-sensitive adhesive layer, characterized in that. 11. The method of claim 10,
As the monomer unit, 15 to 60% by mass of the alkyl acrylate having an alkyl group having 1 to 4 carbon atoms (however, excluding n-butylacrylate) and 30% by mass or more of n-butylacrylate are contained. An optical film with a pressure-sensitive adhesive layer. 11. The method of claim 10,
As said monomer unit, 5-15 mass % of alkyl methacrylate which has said C1-C4 alkyl group, and 70 mass % or more of n-butyl acrylate are contained, The optical film with an adhesive layer characterized by the above-mentioned. 8. The method according to any one of claims 1 to 7,
The monomer (a) contains the alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms and the fluorine-containing monomer, and as the monomer unit, an alkyl (meth)acryl group having an alkyl group having 1 to 4 carbon atoms. 30 mass % or more of rate, 25 mass % or more of fluorine-containing monomers are contained, and 30 mass % or more of n-butyl acrylate is contained, The optical film with an adhesive layer characterized by the above-mentioned. 8. The method according to any one of claims 1 to 7,
The monomer (a) contains the alkyl (meth)acrylate and acrylonitrile having an alkyl group having 1 to 4 carbon atoms, and as the monomer unit, an alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms. 70 mass % or more of acrylonitrile contains 5 mass % or more, and 70 mass % or more of n-butyl acrylate is contained, The optical film with an adhesive layer characterized by the above-mentioned. 8. The method according to any one of claims 1 to 7,
The said monomer (a) contains the said alkoxyalkyl (meth)acrylate 70 mass % or more, The optical film with an adhesive layer characterized by the above-mentioned. 17. The method according to any one of claims 1 to 16,
The said silane coupling agent (B) is at least 1 sort(s) chosen from an epoxy group containing silane coupling agent (b1) and a mercapto group containing silane coupling agent (b2), The optical film with an adhesive layer characterized by the above-mentioned. 18. The method of claim 17,
The said epoxy group containing silane coupling agent (b1) is a low molecular-type epoxy group containing silane coupling agent (b1), The optical film with an adhesive layer characterized by the above-mentioned. 19. The method of claim 17 or 18,
The said mercapto group-containing silane coupling agent (b2) is an oligomer-type mercapto group-containing silane coupling agent (b2), The optical film with an adhesive layer characterized by the above-mentioned. 20. The method according to any one of claims 1 to 19,
The said adhesive composition contains a crosslinking agent, The optical film with an adhesive layer characterized by the above-mentioned. It has an image display part and the optical film with an adhesive layer in any one of Claims 1-20, The image display panel characterized by the above-mentioned. 22. The method of claim 21,
The said optical film with an adhesive layer is arrange|positioned via the adhesive layer of the said optical film with an adhesive layer on the visual recognition side of the said image display part, The image display panel characterized by the above-mentioned. The image display apparatus which has the image display panel of Claim 21 or 22.

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