CN103097923B - Optical component and use thereof - Google Patents

Abstract

The present invention relates to an optical member for an image display device including an optical member, a transparent protective member, and an adhesive layer interposed between the two members, and further having an image display portion on a side of the optical member opposite to the adhesive layer, the optical member satisfying the following condition (1): after 10. mu.l of an evaluation adhesive containing 14 wt% of dicyclopentenyloxyethyl methacrylate, 8 wt% of benzyl methacrylate, 2 wt% of methyl methacrylate and 0.2 wt% of a photopolymerization initiator, which are based on an isoprene polymer, was dropped onto the surface of the optical member, the contact angle between the optical member and the evaluation adhesive was 55 ℃ or less when the optical member was left for 5 minutes. The invention provides an optical member capable of suppressing appearance defects caused by bubbles generated between the optical member and a transparent protective member, and an image display device using the optical member to suppress the appearance defects.

Description

Optical components and their uses

technical field

The present invention relates to an optical member for use in an optical member having an optical member, a transparent protective member, and an adhesive layer interposed between the two members, and further having an image display portion on the side of the optical member opposite to the adhesive layer image display device.

Background technique

It is known that in image display devices such as liquid crystal display (LCD), organic electroluminescence display (ELD), plasma display (PDP), surface conduction electron emission display (SED), field emission display (FED), etc., images such as liquid crystal cells Optical components such as polarizing plates, anti-glare films, and anti-reflection films are placed on the viewing side of the display unit. To protect these optical components, a transparent protective member made of glass or the like is placed with an adhesive layer in between. As a method for producing such an image display device, known methods include, for example, dropping an adhesive onto the optical member, putting it into the transparent protective member after unfolding, superimposing it on the optical member, and curing the adhesive. Thereby, the method of integrating them (JP2005-55641A).

However, depending on the optical member used, the adhesive may be repelled when the adhesive is dropped on the optical member, and as a result, air bubbles are generated between the optical member and the transparent protective member. Therefore, the present invention aims to provide an optical component capable of suppressing appearance defects caused by air bubbles generated between the optical component and the transparent protective component.

Under the circumstances, the present inventors conducted intensive studies, and thus completed the present invention.

Contents of the invention

That is, the present invention includes the following:

1 Optical component for an image display device having an optical component, a transparent protective component, and an adhesive layer interposed between these two components, and having an image display portion on the side opposite to the adhesive layer of the optical component, which Satisfy the conditions of (1) below,

(1) With isoprene polymer as the main component, it contains 14% by weight of dicyclopentenyloxyethyl methacrylate, 8% by weight of benzyl methacrylate, 2% by weight of methyl methacrylate and The contact angle between the optical member and the adhesive for evaluation when 10 μl of the adhesive for evaluation with 0.2% by weight of the photopolymerization initiator was dropped on the surface of the optical member and left for 5 minutes was 55° or less.

The optical component described in 21 also satisfies the condition of (2) below,

(2) The main component is isoprene polymer, containing 14% by weight of dicyclopentenyloxyethyl methacrylate, 8% by weight of benzyl methacrylate, 2% by weight of methyl methacrylate and After the photopolymerization initiator 0.2% by weight of the adhesive for evaluation is coated on the surface of the aforementioned optical member, the maximum ratio of the aforementioned optical member to the aforementioned adhesive layer in the sample in which the adhesive layer is formed by curing treatment is The shear stress is above 140N.

3. The optical component described in 1 or 2, which is in the form of a sheet or a film.

4. The optical component according to any one of 1 to 3, wherein the surface on the side inserted into the adhesive layer has been subjected to antiglare treatment, antireflection treatment, hard coat treatment, antistatic treatment, and adhesion promotion treatment at least one treatment.

5. The optical component according to any one of 1 to 4, wherein the surface on the side where the adhesive layer is inserted is not subjected to antifouling treatment.

6. A protective film for a polarizer, consisting of the optical component described in any one of 1 to 5.

7. A polarizing plate, with the polarizer protective film described in 5, and a polarizer.

8. An image display device having an optical component, a transparent protective component, and an adhesive layer interposed between these two components, and having an image display portion on the side opposite to the adhesive layer of the optical component, the optical component satisfying the aforementioned (1) Conditions.

9. The image display device described in 8, wherein the optical component also satisfies the condition of (2) above.

10. The image display device according to 8 or 9, wherein the adhesive layer interposed between the optical member and the transparent protective member contains a compound selected from acrylic resins, hydrogenated terpene resins, and xylene-based resins. A resin, at least one polymer of a butadiene polymer and an isoprene polymer, a binder of a (meth)acrylate monomer and a photopolymerization initiator is cured and formed.

11 The image display device described in 10, wherein the acrylic resin is selected from polyurethane (meth)acrylate, polyisoprene (meth)acrylate, polyisoprene (meth)acrylic acid At least one polymer of ester compounds of esters.

12 The image display device described in 10 or 11, the (meth)acrylate monomer is selected from methyl (meth)acrylate, benzyl (meth)acrylate, dicyclopentene (meth)acrylate At least one monomer selected from oxyethyl ester, isobornyl (meth)acrylate and 2-hydroxybutyl (meth)acrylate.

13 An optical part that satisfies the condition in (1) above has an optical part, a transparent protective part, and an adhesive layer interposed between these two parts, and has an image display part on the side opposite to the adhesive layer of the optical part applications in image display devices.

14. The application of the optical component described in 13, wherein the optical component also satisfies the aforementioned condition (2).

15. The application of the optical component described in 13 or 4, wherein the optical component is in the form of a sheet or a film.

16. The application of the optical component described in any one of 13 to 15, wherein the surface of the optical component on the side inserted into the adhesive layer is treated with anti-glare treatment, anti-reflection treatment, hard-coat treatment, anti-glare treatment, At least one of electrostatic treatment and adhesion promoting treatment.

17. The application of the optical component according to any one of 13 to 16, wherein the surface of the optical component on the side inserted into the adhesive layer is not subjected to antifouling treatment.

The present invention can provide an optical member capable of suppressing appearance defects caused by air bubbles generated between the optical member and a transparent protective member, and an image display device in which the aforementioned appearance defects are suppressed by using the optical member.

Description of drawings

FIG. 1 is a conceptual diagram of an image display device of the present invention.

Fig. 2 is a schematic diagram of a sample used for measuring the maximum shear stress of an optical component.

Detailed ways

<Optical Parts>

The optical component of the present invention is used as a component of an image display device having the optical component of the present invention, a transparent protective component, and an adhesive layer interposed between the two components. The side opposite to the agent layer also has an image display portion. In addition, the optical member of the present invention has a contact angle measured with a specific adhesive for evaluation of a predetermined value or less. In this way, in an image display device having an image display portion, an optical member, an adhesive layer, and a transparent protective member sequentially from the image display portion, by adopting the optical member of the present invention having a contact angle of a predetermined value as the aforementioned optical member, The occurrence of air bubbles between the optical part and the transparent protective part can be suppressed.

The optical component of the present invention satisfies the following condition (1):

(1) With isoprene polymer as the main component, it contains 14% by weight of dicyclopentenyloxyethyl methacrylate, 8% by weight of benzyl methacrylate, 2% by weight of methyl methacrylate and The contact angle between the optical member and the adhesive for evaluation when 10 μl of the adhesive for evaluation with 0.2% by weight of the photopolymerization initiator was dropped on the surface of the optical member and left for 5 minutes was 55° or less.

The aforementioned adhesive for evaluation is used for evaluating the contact angle of an optical member, and the adhesive does not necessarily have to constitute an adhesive layer of an image display device. As mentioned above, this adhesive for evaluation contains isoprene polymer as the main component, and contains 14% by weight of dicyclopentenyloxyethyl methacrylate, 8% by weight of benzyl methacrylate, methacrylic acid 2% by weight of methyl ester and 0.2% by weight of photopolymerization initiator. As the photopolymerization initiator mentioned here, conventionally known polymerization initiators such as Irgacure 184 can be used. Other additives of the binder for evaluation may contain diphenylphosphine in addition to solvents such as acetone, 2,4,6-trimethylbenzoic acid, and polymerization regulators such as 1-octylthiol. , in essence, except for the above-mentioned essential components, the other components are all or substantially composed of isoprene polymer. Since the adhesive for evaluation is composed of such components, it is transparent and has stickiness.

When the optical member of the present invention was left to stand for 5 minutes after dripping 10 μl of the aforementioned adhesive for evaluation onto its surface, the contact angle between the surface of the optical member and the adhesive for evaluation was 55° or less. Although the adhesive for evaluation is used for the measurement of the contact angle, it can also be measured by the same method as the water contact angle. For example, it can be measured using the Contact Angle System "OCA30L" of DataPhysics Corporation.

The aforementioned contact angle of the optical member of the present invention is 55° or less, whereby the generation of the aforementioned air bubbles can be suppressed. From the viewpoint of suppressing generation of air bubbles, the contact angle is preferably 50° or less.

The optical component of the present invention preferably also satisfies the following condition (2):

(2) The main component is isoprene polymer, containing 14% by weight of dicyclopentenyloxyethyl methacrylate, 8% by weight of benzyl methacrylate, 2% by weight of methyl methacrylate and After the photopolymerization initiator 0.2% by weight of the adhesive for evaluation is coated on the surface of the aforementioned optical member, the maximum ratio of the aforementioned optical member to the aforementioned adhesive layer in the sample in which the adhesive layer is formed by curing treatment is The shear stress is above 140N.

Here, a method of measuring the maximum shear stress of an optical component will be described with reference to FIG. 2 . First, as the adhesive for evaluation, the same adhesive for evaluation as described above was used. Next, after coating the adhesive for evaluation on the surface of the optical component 1 bonded to the glass plate 6 in advance, the glass plate 7 is superimposed on the surface coated with the adhesive, and then cured by irradiating active energy rays. By processing, an adhesive layer 8 is formed between the optical component 1 and the glass plate 7 to prepare a measurement sample. After that, stress is applied at a certain speed in the direction in which the glass plate 6 and the glass plate 7 face each other (arrow direction in FIG. 2 ), that is, in the direction in which the adhesive layer 8 is pulled away from the optical component 1, and the observed The maximum value of the force is the maximum shear stress. This maximum shear stress can be measured according to JIS K6868-2. As a device for measuring the maximum shear stress, for example, Autograph (AG-1) manufactured by Shimadzu Corporation can be used. The maximum shear stress measured in this way means the maximum shear stress of the optical component specified in the condition of (2) above.

The maximum shear stress of the optical component is preferably 140N or more. By making the maximum shear stress more than 140N, the adhesiveness between the optical member and the transparent protective member laminated with an adhesive is improved. For example, in an image display device with a large transparent protective member such as a liquid crystal television, Displacement of the transparent protection member due to its own weight can be prevented. In addition, displacement of the member due to the physical load can be prevented in an image display device such as a mobile information terminal that has a physical load during movement.

The optical member of the present invention may be a plate-shaped, sheet-shaped, or film-shaped member having the above-mentioned specific contact angle, but as a constituent member of an image display device, a sheet-shaped or film-shaped member is preferable. Among them, antiglare treatment, antireflection treatment, hard coat treatment, antistatic treatment, and primer treatment are preferred. As the film after these treatments, it can be an antiglare film, a light diffusion film, an antireflection film, and a polarizer. Protective film or polarizing plate with polarizer protective film, etc. These are described below.

The antiglare film is used to impart an antiglare function to an image display device, and may be, for example, a film in which an antiglare surface is formed on the surface of a transparent base film. Suitable examples of the anti-glare surface mentioned here include (a) an anti-glare layer in which predetermined unevenness is formed on the surface by dispersing light-transmitting fine particles in a light-transmitting resin; An anti-glare layer with predetermined irregularities formed on the surface using a metal mold or the like, and (c) an anti-glare surface with predetermined irregularities directly formed on the surface of the transparent base film. Among them, the aforementioned (a) and (b) are preferable from the viewpoint of anti-glare property and other optical properties.

As the transparent material film used for the anti-glare film, as long as it is a resin film with moderate transparency and mechanical strength, for example, cellulose acetate resin such as TAC (triacetyl cellulose), acrylic resin, polycarbonate resin, etc. Ester resins, polyester resins such as polyethylene terephthalate, and polyolefin resins such as polyethylene and polypropylene.

The light-transmitting resin constituting the aforementioned anti-glare layer is sufficient as long as it has light-transmitting properties. For example, cured products of ionizing radiation-curable resins such as ultraviolet curable resins and electron beam curable resins, cured products of thermosetting resins, and thermoplastic resins can be used. Resins, metal alkoxide polymers, etc. Among them, cured products of ionizing radiation-curable resins are preferred.

As the ionizing radiation curable resin, polyfunctional urethane acrylic acid synthesized from polyfunctional acrylate such as polyol acrylate or methacrylate, diisocyanate, polyol, and hydroxy ester of acrylic acid or methacrylic acid can be used. Esters etc. In addition, besides these resins, polyether resins, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, etc. having acrylate functional groups can also be used. resin etc.

When using an ultraviolet curable resin as an ionizing radiation curable resin, a photopolymerization initiator is usually added. A photopolymerization initiator can be selected suitably according to the resin used. As the photopolymerization initiator (radical polymerization initiator), benzoin such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl methyl ketal, and other benzoins and other compounds can be used. Alkyl ethers etc.

The cured product of the thermosetting resin may be thermosetting polyurethane resin, phenolic resin, urea melamine resin, epoxy resin, unsaturated polyester resin, silicone resin, etc. formed from acrylic polyol and isocyanate prepolymer.

As thermoplastic resins, cellulose derivatives such as acetyl cellulose, nitrocellulose, cellulose acetate butyrate, ethyl cellulose, and methyl cellulose, vinyl acetate and its copolymers, vinyl chloride and its copolymers, Vinyl resins such as vinyl chloride and its copolymers, acetal resins such as polyvinyl formal and polyvinyl butyral, acrylic resins and their copolymers, acrylic resins such as methacrylic resins and their copolymers, polystyrene Vinyl resin, polyamide resin, linear polyester resin, polycarbonate resin, etc.

As the metal alkoxide-based polymer, a silicon oxide-based matrix or the like made of a silicon alkoxide-based material can be used. Specifically, alkoxysilanes such as tetramethoxysilane and tetraethoxysilane can be used to form inorganic or organic-inorganic composite matrix through hydrolysis and dehydration condensation.

When using a cured product of an ionizing radiation-curable resin as a light-transmitting resin, it is necessary to irradiate ionizing radiation such as ultraviolet rays or electron beams after coating and drying on a transparent material film. In addition, when using a cured product of a thermosetting resin or a metal alkoxide polymer as a light-transmitting resin, heating is required after coating and drying.

The light-transmitting fine particles can be, for example, organic fine particles such as acrylic resin, melamine resin, polyethylene, polystyrene, silicone resin, acrylic-styrene copolymer, calcium carbonate, silica, alumina, barium carbonate, barium sulfate, titanium oxide, etc. Inorganic fine particles such as , glass, etc., one kind of these fine particles or a mixture of two or more kinds of fine particles can be used. In addition, in order to obtain desired anti-glare properties or other optical properties, it is only necessary to appropriately adjust the type, particle diameter, refractive index, content, and the like of the light-transmitting fine particles.

When forming the unevenness on the surface of the anti-glare layer with a metal mold or the like, a plate-shaped or roll-shaped mold can be used as such a metal mold.

In order to form these anti-glare layers, after coating a coating solution containing a resin material (ionizing radiation curable resin, thermosetting resin, metal alkoxide) and light-transmitting fine particles to form a light-transmitting resin on a transparent material film, Curing is performed using metal molds as needed. Regarding the coating method of the coating liquid, a conventionally known method can be used, for example, a gravure coating method, a micro concave surface coating method, a roll coating method, a bar coating method, a knife coating method, an air knife coating method, etc. can be used. Glue method, kiss coating method, dispensing coating method, etc.

Next, the coating film is cured by ionizing radiation and/or heat. There are no special restrictions on the type of ionizing rays, and can be appropriately selected from ultraviolet rays, electron rays, near ultraviolet rays, visible light, near infrared rays, infrared rays, X-rays, etc. according to the type of light-transmitting resin, but ultraviolet rays and electron rays are preferred because of the ease of operation. , From the viewpoint of easy access to high energy, ultraviolet rays are particularly preferred.

The light diffusion film diffuses the light from the image display device for the purpose of expanding the viewing angle of the image display device. layer of light diffusing film. Here, as the transparent base film, translucent resin, and translucent fine particles, the same ones as the transparent base film, translucent resin, and translucent fine particles mentioned above for the anti-glare film can be used. When constituting the light-diffusing layer, from the viewpoint of imparting desired light-diffusing properties, as long as the type of transparent base film, the type of translucent resin, the type, particle size, refractive index, content, and The thickness of the light diffusion layer and the like may be appropriately adjusted.

The anti-reflection film is a film used to prevent reflection of external light incident on the surface of an image display device and improve the display quality of the image display device. For example, it is a film having a low refractive index layer on the outside of a transparent base film. In addition, a hard coat layer, a high refractive index layer, and a middle refractive index layer may be provided between such a transparent base film and the low refractive index layer, and a hard coat layer for imparting scratch resistance may be provided on the outermost layer. layer.

As the transparent base film mentioned here, the same films as those exemplified in the anti-glare film mentioned above can be used.

An example of the low refractive index layer is a layer containing a binder matrix and inorganic fine particles. As a material for forming the adhesive matrix, it can be obtained, for example, by irradiating a mixture containing an ionizing radiation-curable resin and a polymerization initiator to polymerize and cure it, or by dehydrating a hydrolyzed product of an alkoxysilane obtained by condensation.

As the ionizing radiation-curable resin and the polymerization initiator, the same ones as the ionizing radiation-curable resin and the polymerization initiator mentioned above for the anti-glare film can be used. On the other hand, examples of inorganic particles include LiF (refractive index 1.4), MgF (refractive index 1.4), 3NaF·AlF (refractive index 1.4), AlF (refractive index 1.4), Na ₃ AlF ₆ (refractive index 1.33) Low refractive particles or hollow silica particles.

The hard coat layer can be formed by irradiating a mixture containing an ionizing radiation-curable resin and a polymerization initiator with ionizing radiation, polymerizing and curing it. As the ionizing radiation-curable resin and the polymerization initiator, the same ones as those listed above for the ionizing radiation-curable resin and the polymerization initiator can be used.

The material constituting the high refractive index layer is not particularly limited, and inorganic materials and organic materials can be used. Examples of inorganic materials include fine particles of zinc oxide, titanium oxide, cerium oxide, aluminum oxide, silane oxide, tantalum oxide, yttrium oxide, ytterbium oxide, zirconium oxide, antimony oxide, indium tin oxide (hereinafter also referred to as ITO). In addition, antistatic performance can also be imparted by forming such a high refractive index layer.

The polarizing plate is composed of a polarizer made of polyvinyl alcohol and a polarizer protective film for protecting the polarizer. The optical component of the present invention may be a polarizing plate or a polarizer protective film as long as it satisfies the aforementioned contact angle conditions. As the polarizer protective film, cellulose acetate resins such as TAC (triacetyl cellulose), acrylic resins, polycarbonate resins, polyester resins such as polyethylene terephthalate, polyethylene, Polyolefin resins such as polypropylene, but it is preferable that the surface of these resins is subjected to adhesion-promoting treatments such as corona discharge treatment, glow discharge treatment, primer treatment, acid treatment, alkali treatment, and ultraviolet irradiation treatment. Among them, polyester resins, polyolefin resins, acrylic resins, and polycarbonate resins subjected to an adhesion-promoting treatment are more preferable from the viewpoint of the aforementioned maximum shear stress.

The optical member of the present invention preferably has no antifouling treatment on its surface with a leveling agent or the like. When antifouling treatment is performed, the contact angle of the optical member tends to increase.

<Transparent Protective Parts>

The transparent protection component is a transparent component disposed on the outermost surface of the viewing side of the image display device, and is used to physically protect the image display device. As such a transparent protective member, a general-purpose glass plate can be used.

<Adhesive>

The adhesive described here is used between the optical member of the present invention and the above-mentioned transparent protective member, and the same adhesive as conventional ones can be used. Among them, it is preferable to contain at least one polymer selected from the group consisting of acrylic resins, hydrogenated terpene resins, xylene resins, butadiene polymers, and isoprene polymers, and (meth)acrylate monomers. and photopolymerization initiators.

The acrylic resin is preferably urethane (meth)acrylate, polyisoprene (meth)acrylate, or esterified polyisoprene (meth)acrylate. On the other hand, examples of the aforementioned (meth)acrylic monomers include methyl (meth)acrylate, ethyl (meth)acrylate, hydroxyethyl (meth)acrylate, 2-(meth)acrylate, Hydroxy ethyl ester, 2-hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate Glycidyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, etc. Among them, methyl (meth)acrylate, benzyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, isobornyl (meth)acrylate, and 2-(meth)acrylate are preferred. Hydroxybutyl Ester. These compounds may be used alone or in combination with one or more other compounds.

In addition, a photopolymerization initiator, a solvent, a polymerization modifier, and the like may be contained in the adhesive.

The binder referred to here may be the aforementioned binder for evaluation.

As a method of forming an adhesive layer between the optical member of the present invention and the transparent protective member, for example, after applying an adhesive to the surface of the optical member, the transparent protective member is superimposed on the surface, followed by irradiation activation. A method of curing with energy lines. The active energy rays can be appropriately selected from ultraviolet rays, electron rays, near ultraviolet rays, visible light, near infrared rays, infrared rays, X-rays and the like, among which ultraviolet rays are preferable.

<Image display device>

In this way, a unit comprising the optical member of the present invention, the transparent protective member and the adhesive layer interposed between these two members can be manufactured. Furthermore, by having an image display portion on the side opposite to the adhesive layer of the optical member, an image display device can be formed. Here, the image display device will be described with reference to FIG. 1 , which is a schematic diagram of the image display device of the present invention. As shown in FIG. 1 , an image display device 5 includes an image display unit 4 , an optical member 1 , an adhesive layer 3 , and a transparent protective member 2 in this order. Here, the transparent protective member 2 becomes the viewing side of the image display device 5 , and the image display unit 1 becomes the light source side (not shown in the figure) of the image display device 5 .

As the image display unit 1, for example, a liquid crystal panel, an EL panel, a PDP, or the like can be used.

When the image display device 5 is a liquid crystal display device, a rear polarizing plate, a prism plate, a light diffusion plate, and a backlight device (none of which are shown in the figure) are also disposed on the light source side of the image display unit 4 .

Example

The present invention is further described in detail with examples below, but the present invention is not limited to these examples.

<Adhesive for evaluation>

A binder for evaluation that was analyzed as follows by gas chromatography was used.

Main ingredient: Isoprene polymer

Dicyclopentenyloxyethyl methacrylate: 14% by weight

Benzyl methacrylate: 8% by weight

Methyl methacrylate: 2% by weight

Photopolymerization initiator (Yanjiagu 184): 0.2% by weight

Other additives: (meth)acrylate monomer 0.8% by weight, acetone, 2,4,6-trimethylbenzoic acid, 1-octyl mercaptan, diphenylphosphine Peak observed, but below limit of quantitation.)

<Measurement of Contact Angle>

After dropping 5 ml of the above-mentioned adhesive for evaluation on the surface of the film-shaped optical component to be measured, and leaving it for 5 minutes, the adhesion between the optical component and the evaluation was measured using the Contact Angle System "OCA30L" produced by DataPhysics. the contact angle of the agent.

<Measurement of maximum shear stress>

After the aforementioned adhesive for evaluation was applied to the surface of the optical member bonded to the glass plate in advance, the glass plate was superimposed on the surface on which the adhesive was applied. Here, the length of the adhesive coating film in the direction in which the stress is applied was adjusted to be about 12.5 mm, and the thickness of the adhesive coating film was adjusted to be about 150 μm.

Next, ultraviolet irradiation was performed using a UV irradiation device (product of Shinko Chemical Co., Ltd.) at a cumulative light intensity of 5000 mJ/cm ² to cure the adhesive to form an adhesive layer.

For the measurement sample prepared in this way, use Autograph (AG-1) manufactured by Shimadzu Corporation in the direction in which the glass plates face each other, that is, in the direction in which the adhesive layer is pulled away from the optical part. Stress is applied at a certain speed (5mm/min), and the maximum shear stress is obtained.

<Evaluation of bubble generation>

The presence or absence of air bubbles between the optical member and the transparent protective member was evaluated as follows.

First, a glass plate is used as a transparent protective part. Next, the aforementioned adhesive for evaluation was transferred to an adhesive for forming an adhesive layer interposed between the optical member and the transparent protective member.

Specifically, after the adhesive was applied to the central portion of the surface of an optical member measuring 9 cm in length and 9 cm in width, a glass plate was superimposed thereon, and the spread of the adhesive was evaluated. The case where no air bubbles were trapped and the adhesive was well developed was marked as ○, and the case where some air bubbles were trapped and the adhesive was not well developed was marked as ×. If no air bubbles are trapped in the stage of superimposing the glass plates and the adhesive is well developed, it will still have a good appearance even after curing treatment. If air bubbles are trapped, the air bubbles will remain even after curing treatment bad.

<Sample evaluation 1>

The contact angle and maximum shear stress of film-like optical components (sample Nos. 1 to 12) having the following configurations were evaluated. The results are shown in Table 1.

(Sample No.1)

・A film-like optical component having an antiglare layer mainly composed of pentaerythritol tetraacrylate (hereinafter PETA) and dipentaerythritol hexaacrylate (hereinafter DPHA) on a triacetylcellulose (hereinafter referred to as TAC) base film.

(Sample No.2)

- A film-shaped optical component having an antiglare layer mainly composed of PETA on a TAC base film.

(Sample No.3)

・A film-shaped optical component having an antiglare layer mainly composed of PETA or IPDI on a TAC base film. The surface of the optical part was analyzed by TOF-SIMS, and the presence of fluorine-containing compounds was not found.

(Sample No.4)

・A film-shaped optical component having an antiglare layer mainly composed of PETA or organosiloxane on a TAC base film.

(Sample No.5)

・A film-shaped optical component having a hard coat layer mainly composed of PETA and hexamethylene diisocyanate (hereinafter referred to as HDI) on a TAC base film.

(Sample No.6)

・A film-shaped optical component having a hard coat layer mainly composed of PETA, DPHA, tris(2-acryloyloxyethyl)isocyanurate (hereinafter referred to as TAIC), and IPDI on a TAC base film.

(Sample No.7)

・A film-shaped optical component having an anti-glare layer mainly composed of PETA, DPHA, IPDI, and 2-hydroxyethyl methacrylate (hereafter referred to as HEMA) and containing an antistatic agent on a TAC base film.

(Sample No.8)

- A film-shaped optical component having an antistatic layer on a TAC base film and an antiglare layer mainly composed of PETA, DPHA, IPDI, HEMA, or TAIC on the antistatic layer. The surface of the optic was analyzed by TOF-SIMS and the presence of perfluoropolyether was found.

(Sample No.9)

- A film-shaped optical component having an antistatic layer on a TAC base film and an antiglare layer mainly composed of PETA, DPHA, IPDI, HEMA, or TAIC on the antistatic layer. The surface of the optic was analyzed by TOF-SIMS and the presence of perfluoropolyether was found.

(Sample No.10)

・A film-shaped optical component having an antiglare layer mainly composed of PETA or IPDI on a TAC base film. The surface of the optic was analyzed by TOF-SIMS and the presence of perfluoropolyether was found.

(Sample No.11)

・A film-shaped optical component having an antiglare layer mainly composed of PETA, DPHA, or IPDI and containing an antistatic agent on a TAC base film. The surface of the optic was analyzed by TOF-SIMS and the presence of perfluoropolyether was found.

Table 1

Examples and Comparative Examples

As a result of the above-mentioned bubble generation evaluation on sample No. 3, no bubbles were trapped and the adhesive spread well. On the other hand, the above-mentioned bubble generation evaluation was also performed on Sample No. 9. As a result, some bubbles were trapped and the adhesive did not spread well.

<Sample evaluation 2>

The surface of the PET base film can be subjected to an adhesion promotion treatment such that the contact angle becomes 25° and the maximum shear stress becomes 160N.

When the aforementioned bubble generation evaluation is performed on the aforementioned optical member, it is expected that no bubbles are trapped and the adhesive is spread well.

Reference example

The maximum shear stress of the TAC substrate film is 55N.

Symbol Description

1: Optical components

2: Transparent protective parts

3: Adhesive layer

4: Image display unit

5: Image display device

6, 7: glass plate

8: Adhesive layer formed from the adhesive for evaluation

Claims (17)

1. optics; for there is optics, transparency protected parts and the adhesive phase between these two parts and with adhesive phase opposite side, there is the image display device of image displaying part at optics; described optics meets the condition of following (1)

(1) will take isoprene copolymer as principal ingredient, after on the surface being added drop-wise to described optics containing the evaluation bonding agent 10 μ l of methacrylic acid dicyclopentenyl oxygen ethyl ester 14 % by weight, benzyl methacrylate 8 % by weight, methyl methacrylate 2 % by weight and Photoepolymerizationinitiater initiater 0.2 % by weight, described optics when placing 5 minutes and the contact angle of described evaluation bonding agent are below 55 °.

2. optics according to claim 1, is characterized in that, also meets the condition of following (2),

(2) will take isoprene copolymer as principal ingredient, after on the surface being applied to described optics containing the evaluation bonding agent of methacrylic acid dicyclopentenyl oxygen ethyl ester 14 % by weight, benzyl methacrylate 8 % by weight, methyl methacrylate 2 % by weight and Photoepolymerizationinitiater initiater 0.2 % by weight, the described optics be formed in the sample of adhesive phase through solidification process to the maximum shear stress of described adhesive phase at more than 140N.

3. optics according to claim 1 and 2, is characterized in that, is sheet or membranaceous.

4. optics according to claim 1 and 2, it is characterized in that, at least one process of the surface being inserted into the side of described adhesive phase in non-glare treated, antireflection process, dura mater process, electrostatic prevention process and adhesion promotion process of described optics.

5. optics according to claim 1 and 2, is characterized in that, the surface free being inserted into described adhesive phase side of described optics crosses antifouling process.

6. polarizer diaphragm, the optics according to any one of Claims 1 to 5 is formed.

7. Polarizer, has polarizer diaphragm according to claim 6, and polarizer.

8. image display device, have optics, transparency protected parts and the adhesive phase between these two parts, also have image displaying part in the side contrary with adhesive phase of optics, described optics meets the condition of following (1),

(1) will take isoprene copolymer as principal ingredient, after on the surface being added drop-wise to described optics containing the evaluation bonding agent 10 μ l of methacrylic acid dicyclopentenyl oxygen ethyl ester 14 % by weight, benzyl methacrylate 8 % by weight, methyl methacrylate 2 % by weight and Photoepolymerizationinitiater initiater 0.2 % by weight, described optics when placing 5 minutes and the contact angle of described evaluation bonding agent are below 55 °.

9. image display device according to claim 8, is characterized in that, described optics also meets the condition of following (2),

(2) will take isoprene copolymer as principal ingredient, after on the surface being applied to described optics containing the evaluation bonding agent of methacrylic acid dicyclopentenyl oxygen ethyl ester 14 % by weight, benzyl methacrylate 8 % by weight, methyl methacrylate 2 % by weight and Photoepolymerizationinitiater initiater 0.2 % by weight, the described optics be formed in the sample of adhesive phase through solidification process to the maximum shear stress of described adhesive phase at more than 140N.

10. image display device according to claim 8 or claim 9; it is characterized in that, the adhesive phase between described optics and described transparency protected parts is formed by being cured process to the bonding agent containing at least one polymkeric substance be selected from acrylic resin, hydriding terpene resinoid, xylene resin, butadiene polymer and isoprene copolymer, (methyl) acrylic ester monomer and Photoepolymerizationinitiater initiater.

11. image display devices according to claim 10, it is characterized in that, described acryl resin is for being selected from least one polymkeric substance in the ester compounds of polyurethane (methyl) acrylate, polyisoprene class (methyl) acrylate, polyisoprene class (methyl) acrylate.

12. image display devices according to claim 10, it is characterized in that, described (methyl) acrylic ester monomer is for being selected from least one monomer in (methyl) methyl acrylate, (methyl) benzyl acrylate, (methyl) acrylic acid dicyclopentenyl oxygen ethyl ester, (methyl) isobornyl acrylate and (methyl) acrylic acid 2-hydroxybutyl.

13. application of optics in image display device meeting the condition of following (1); described image display device has optics, transparency protected parts and the adhesive phase between these two parts and also has image displaying part in the side contrary with adhesive phase of optics

The condition of described (1) is, to take isoprene copolymer as principal ingredient, after on the surface being added drop-wise to described optics containing the evaluation bonding agent 10 μ l of methacrylic acid dicyclopentenyl oxygen ethyl ester 14 % by weight, benzyl methacrylate 8 % by weight, methyl methacrylate 2 % by weight and Photoepolymerizationinitiater initiater 0.2 % by weight, described optics when placing 5 minutes and the contact angle of described evaluation bonding agent are below 55 °.

14. application according to claim 13, is characterized in that, described optics also meets the condition of following (2),

(2) will take isoprene copolymer as principal ingredient, after on the surface being applied to described optics containing the evaluation bonding agent of methacrylic acid dicyclopentenyl oxygen ethyl ester 14 % by weight, benzyl methacrylate 8 % by weight, methyl methacrylate 2 % by weight and Photoepolymerizationinitiater initiater 0.2 % by weight, the described optics be formed in the sample of adhesive phase through solidification process to the maximum shear stress of described adhesive phase at more than 140N.

15. application according to claim 13 or 14, it is characterized in that, described optics is sheet or membranaceous.

16. application according to claim 13 or 14, it is characterized in that, at least one process of the surface being inserted into the side of described adhesive phase in non-glare treated, antireflection process, dura mater process, electrostatic prevention process and adhesion promotion process of described optics.

17. application according to claim 13 or 14, it is characterized in that, the surface free being inserted into the side of described adhesive phase of described optics crosses antifouling process.