CN107664788A - Optical laminate - Google Patents

Abstract

It is an object of the present invention to provide a kind of xanthochromia being not likely to produce over time, when under hot environment xanthochromia inhibition also excellent optical laminate.The present invention provides a kind of optical laminate, it is the optical laminate for possessing first adhesive phase, polarization plates and second adhesive phase successively, the polarization plates include the polarizer that thickness is less than 23 μm and formed, the polarizer is the polyvinyl alcohol resin film for including dichroism pigment, when the gross thickness of whole adhesive phases contained in the optical laminate to be set to T1, the thickness of the polarizer is set into T2, T2/T1 is less than 0.6.

Description

Optical laminate

Technical field

Image display device the present invention relates to optical laminate and comprising the optical laminate.More specifically, it is related to Press from both sides and be fitted in the optical laminate that is used between transparent panel and image-display units and comprising the light across adhesive phase Learn the image display device of layered product.

Background technology

In the past, the optical laminate such as polarization plates, elliptical polarization plate, which was pressed from both sides, is fitted in liquid crystal cells across adhesive phase or has Between the transparent panel such as the image-display units such as machine EL element and front panel or touch panel, for liquid crystal display device, organic EL In the various image display devices such as display device.In recent years, such a image display device is except as portable phone, tablet terminal Beyond image display device Deng mobile device, dress is also shown by the image vehicle-mounted as guider or reverse monitor etc. Put and use, among its purposes is widened.Therewith together, for optical laminate, it is desirable to required tighter than ever High-durability under cruel environment (such as under hot environment), proposed that the polarization plates for the purpose of ensuring such a durability were (special Sharp document 1).

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2014-102353 publications

The content of the invention

Invent problem to be solved

By by use the polyvinyl alcohol resin film for containing dichroism pigment be used as polarizer optical laminate folder every Adhesive phase and be fitted in the image display device formed between image-display units and transparent panel exposed to hot environment When lower, because polyoxyalkylene (the Port リ エ Application) of polyvinyl alcohol promotes, it is thus possible to the problem of producing optical laminate xanthochromia.This The defects of kind xanthochromia turns into the outward appearance of optical laminate, produced in addition because xanthochromia promotes in terms of the optical characteristics of optical laminate Raw defect.Particularly, under the harsh temperature conditionss higher than 95 DEG C (such as 105 DEG C etc.), the propulsion of xanthochromia has more obvious Trend, thus require there is the high inhibition of optical laminate there is to(for) the xanthochromia under such a hot environment.

So it is an object of the present invention to provide a kind of optical laminate, it is not likely to produce xanthochromia over time, When under hot environment, xanthochromia inhibition is also excellent.

For solving the method for problem

The present inventor etc. have made intensive studies to solve the above problems, and as a result complete the present invention.

That is, the present invention provides following suitable mode.

[1] a kind of optical laminate, it is the light for possessing first adhesive phase, polarization plates and second adhesive phase successively Learn layered product,

The polarization plates include the polarizer that thickness is less than 23 μm and formed, and the polarizer is poly- comprising dichroism pigment Vinyl alcohol resin film,

The gross thickness of whole adhesive phases contained in the optical laminate is being set to T1, by the polarizer When thickness is set to T2, T2/T1 is less than 0.6.

[2] optical laminate according to described in [1], wherein, the absorbance under the wavelength 700nm of the polarizer A₇₀₀For less than 5.5.

[3] optical laminate according to described in [1] or [2], it is pressed from both sides fits in across described adhesive layer Used between isotropic disk and image-display units.

[4] optical laminate that any one of [1]~[3] according to are recorded, wherein, the polarization plates are included and are laminated in At least one side of the polarizer has 200g/m²The diaphragm of the moisture permeability of more than 24 hours.

[5] a kind of image display device, it includes the optical laminate that any one of described [1]~[4] are recorded.

Invention effect

According to the present invention it is possible to provide a kind of optical laminate, it is not likely to produce xanthochromia over time, exposed to height Xanthochromia inhibition when under warm environment is excellent.

Brief description of the drawings

Fig. 1 is the sectional view of the composition for the optical laminate for being denoted as an embodiment of the invention.

Fig. 2 is the sectional view of the composition for the image display device for being denoted as an embodiment of the invention.

Embodiment

Hereinafter, embodiments of the present invention are described in detail.Moreover, the scope of the present invention is not by reality described herein as The mode of applying limits, and can carry out various changes in the scope of purport of the present invention is not damaged.

Optical laminate (also referred to as " optical laminate of the invention ") as an embodiment of the invention is successively Possess first adhesive phase, polarization plates and second adhesive phase.A reality if based on Fig. 1 to the optical laminate of the present invention The composition for applying mode illustrates, then optical laminate of the invention is the one side stacking first adhesive phase in polarization plates (10) (2), fold second adhesive phase (2 ') in the surface layer of polarization plates (10) and first adhesive phase (2) opposite side and form.This hair In bright optical laminate, in first adhesive phase (2) and second adhesive phase (2 ') and polarization plates (10) opposite side Face, in order to protect adhesive phase, the screening glass (5) that can be peeled off can also be bonded respectively.

By peeling off screening glass (5), first adhesive phase (2) is fitted in into image-display units (7), by second adhesive Layer (2 ') fits in transparent panel (6), and forms the image display device as an embodiment of the invention as shown in Figure 2 (also referred to as " image display device of the invention ").Moreover, backlight etc. is eliminated in Fig. 2.

The polarization plates (10) for forming the optical laminate of the present invention include polarizer (1).Polarization plates (10) can have At least one side of polarizer (1) possesses the structure of diaphragm (3), can also press from both sides polarizer (1) across bonding with diaphragm (3) Oxidant layer (4) engages.In an embodiment of the optical laminate of the present invention, optical laminate of the invention is in polarizer (1) two sides presss from both sides possesses diaphragm (3) across bond layer (4).

Hereinafter, each member of formation of the optical laminate of the present invention is described in detail.

＜ optical laminates ＞

In the optical laminate of the present invention, it is set to by the gross thickness for forming whole adhesive phases of optical laminate T1, when the thickness of polarizer is set into T2, T2/T1 value is less than 0.6, preferably less than 0.55, more preferably less than 0.50, Particularly preferably less than 0.45.It is more than in T2/T1 value in the case of 0.6, it is difficult to suppress to be exposed under hot environment (particularly At a temperature of higher than 95 DEG C, at a temperature of such as more than 105 DEG C) when xanthochromia.Under the T2/T1 of the optical laminate of the present invention Limit value is not particularly limited, for example, more than 0.001, preferably more than 0.005, more preferably more than 0.008, further preferably For more than 0.01.Moreover, it is so-called form optical laminate whole adhesive phases gross thickness T1, be first adhesive phase and The sum of the thickness of the thickness of second adhesive phase and the other adhesive phases according to circumstances having.So-called other bondings Oxidant layer, it is that can be contained in the adhesive phase beyond in optical laminate, first adhesive phase and second adhesive phase, such as The adhesive phase for optical film described later or optical layer to be fitted in polarization plates can be enumerated and can be used for polarizer with Adhesive phase of the fitting of diaphragm etc..Do not include other adhesive phases in optical laminate but be used as adhesive phase only In the case of comprising first adhesive phase and second adhesive phase, the gross thickness of whole adhesive phases of optical laminate is formed T1 be first adhesive phase thickness and second adhesive phase thickness it is total.

In the present invention, the thickness (T2) of polarizer is less than 23 μm, preferably less than 20 μm, more preferably less than 18 μm, More preferably less than 15 μm.If the thickness of polarizer is below above-mentioned higher limit, optical laminate is not likely to produce Xanthochromia over time, excellent xanthochromia inhibition can be obtained.In addition, if the thickness of polarizer is above-mentioned higher limit Hereinafter, then the thickness of polarizer diminishes, so that the thickness of required adhesive phase also diminishes, therefore from optical laminate It is also favourable from the viewpoint of thin layer.Moreover, the lower limit of the thickness of above-mentioned polarizer is not particularly limited, for example, 3 μm with On.

In given scope it is to be used for by the thickness of polarizer and the rate control of the gross thickness of adhesive phase in the present invention Obtain one of feature of xanthochromia inhibition.That is, even if the thickness of such as polarizer is identical, in the gross thickness with adhesive phase In the case of ratio given herein above being unsatisfactory in terms of relation, it is also difficult to obtain sufficient xanthochromia inhibition.Equally, it is even if viscous The gross thickness of mixture layer is identical, be unsatisfactory for ratio given herein above in terms of the relation of the thickness of polarizer in the case of, It is difficult to be adequately suppressed xanthochromia when under hot environment.

In the optical laminate of the present invention, by by the thickness of the thickness of polarizer and polarizer and adhesive phase The ratio of gross thickness is set to scope given herein above, and high xanthochromia inhibition can be easily assigned to optical laminate. The xanthochromia of optical laminate is produced because of the polyoxyalkylene of the polyvinyl alcohol of polarizer, polyoxyalkylene when the amount of moisture of polarization plates is more Have by the trend promoted.Thus, for example in order to suppress polyoxyalkylene, the side of amount of moisture contained in control polarization plates can be used Method, but the drying process of the amount of moisture for controlling polarization plates is needed, carried out under high temperature and/or prolonged drying condition In the case of drying process, the optical characteristics of polarization plates can reduce.In the present invention, by by the thickness of polarizer and polarization The thickness of piece and the rate control of the gross thickness of adhesive phase can suppress xanthochromia, therefore be not required in the given scope It is used for the drying process of amount of moisture for adjusting polarization plates, is not likely to produce the reduction of the optical characteristics of polarization plates.Further, since not Drying process is needed, so as to easily and efficiently produce, productivity ratio can also be improved.Further, since it can pass through The thickness of polarizer and the gross thickness of adhesive phase are controlled as described above and assign xanthochromia inhibition, therefore without limiting structure Into the constituent of the polarizer of polarization plates or diaphragm etc. and/or composition etc., can be applied in combination various compositions polarizer, Diaphragm.Thus, material, the cheap material easily obtained can be also selected, production cost can be made lower, from these viewpoints Consider also favourable.In addition, by constituent and/or compositions such as the polarizer of specific composition polarization plates, diaphragms, can assign Higher xanthochromia inhibition.

＜ polarization plates ＞

So-called polarization plates in the present invention, it is the component formed comprising polarizer.So-called polarizer, be with from incidence from The film of the function of rectilinearly polarized light is taken out in right light, is the polyvinyl alcohol resin film for including dichroism pigment.It is poly- as forming The polyvinyl alcohol resin of vinyl alcohol resin film, the saponified of polyvinyl acetate system resin can be used.As poly- acetic acid Vinyl acetate system resin, in addition to it can enumerate the polyvinyl acetate as the homopolymer of vinyl acetate, it can also enumerate Vinyl acetate and the copolymer (such as vinyl-vinyl acetate copolymer etc.) of other monomers that can be copolymerized therewith.As Such as unsaturated carboxylic acid class, olefines, vinyl ethers, no can be enumerated with the other monomers of vinyl acetate copolymerization Saturation sulphonic acids, the acrylic amide with ammonium etc..

The saponification degree of polyvinyl alcohol resin is usually 85~100 moles of %, preferably 98 moles of more than %.Polyvinyl alcohol Be that resin can also be modified, for example, can use the polyvinyl formal being modified by aldehydes, polyvinyl acetal, with And polyvinyl butyral resin etc..The degree of polymerization of polyvinyl alcohol resin is usually 1000~10000, and preferably 1500~5000.

Material obtained by such a polyvinyl alcohol resin being filmed uses as the former material film of polarizer.Will The method of polyvinyl alcohol resin film is not particularly limited, and known method can be utilized to be film-made.By polyethenol series The thickness for the former material film that resin is formed is not particularly limited, but if it is considered that the ease for operation of stretching, for example, 10~150 μ M, preferably 15~100 μm, more preferably 20~80 μm.

Polarizer is typically by carrying out the process of uniaxial tension to such a polyvinyl alcohol resin film, by by polyethylene Alcohol resin film dichroism pigment dyes and is allowed to adsorb the process of dichroism pigment, is adsorbed with two with boric acid aqueous solution processing The process of the polyvinyl alcohol resin film of color pigment and the work that washing process is carried out after the processing by boric acid aqueous solution Sequence and manufacture.Moreover, because polyvinyl alcohol resin film is dyed with dichroism pigment, and can be wrapped in polyvinyl alcohol resin film Containing dichroism pigment.In the case of using manufacture method manufacture polarizer, polarizer, which just turns into, includes dichroism pigment Stretching polyethylene alcohol resin film.

The uniaxial tension of polyvinyl alcohol resin film can be carried out before the dyeing of dichroism pigment, can also be with dyeing together When carry out, or can also carry out after dyeing.In the case of carrying out uniaxial tension after dyeing, the uniaxial tension can be Boric acid before processing is carried out, and can also be carried out in boric acid processing.Uniaxial tension can also be carried out in these multiple stages. It during uniaxial tension, can stretch between the different roller of peripheral speed single shaft, stretch while hot-rolling single shaft can also be used.In addition, Uniaxial tension can be the dry type stretching stretched in an atmosphere or make polyvinyl alcohol resin film using solvent The wet tensile stretched in the state of swelling.From the viewpoint of the deformation for suppressing polarizer, stretching ratio is preferably 8 times Hereinafter, more preferably less than 7.5 times, more preferably less than 7 times.In addition, from the sight for embodying the function as polarizer Point considers that stretching ratio is usually more than 4.5 times.By the way that stretching ratio is set into the scope, can suppress polarizer with The deformation of time passage.

As the method for dyeing polyvinyl alcohol resin film with dichroism pigment, such as can enumerate polyethenol series Resin film is impregnated in the method in the aqueous solution containing dichroism pigment.As dichroism pigment, such as iodine or two can be used Color dyestuff.In dichroic dye, such as include the dichroism formed by the grade bis-azo compounds of C.I.DIRECT RED 39 Direct dyes, the dichroism direct dyes formed by trisazo-, four azo-compounds etc..Moreover, polyvinyl alcohol resin film is excellent It is selected in dyeing before processing and first implements the impregnation into water.

In the case where using iodine as dichroism pigment, generally use impregnates into the aqueous solution containing iodine and KI Polyvinyl alcohol resin film and the method dyed.The content of iodine in the aqueous solution is usually 0.01~1 in every 100 mass parts water Mass parts, the content of KI is usually 0.5~20 mass parts in every 100 mass parts water.Iodine is being used as dichroism pigment In the case of, the temperature of the aqueous solution used is usually 20~40 DEG C in dyeing, in addition, the dip time into the aqueous solution (dyeing time) is usually 20~1800 seconds.

Moreover, before polyvinyl alcohol resin film is impregnated into the aqueous solution containing iodine and KI, in order to make molten It is swollen and easy to dye, can be by the film immersion in water.The temperature of the impregnation is usually 20~80 DEG C, preferably 30~60 DEG C, dip time (dyeing time) is usually 20~1800 seconds.

In the case where using dichroic dye as dichroism pigment, generally use is to including water-soluble dichroic dye The aqueous solution in impregnate polyvinyl alcohol resin film and the method that dyes.The content of dichroic dye in the aqueous solution is usually 1 × 10 in every 100 mass parts water^{- 4}~10 mass parts, preferably 1 × 10^{- 3}~1 mass parts, more preferably 1 × 10^{- 3}~1 × 10^{- 2}Mass parts.The aqueous solution can also contain the inorganic salts such as sodium sulphate as dyeing assistant.Used as dichroism pigment In the case of dichroic dye, the temperature of aqueous dye solutions used is usually 20~80 DEG C in dyeing, in addition, in the aqueous solution In dip time (dyeing time) be usually 10~1800 seconds.

Can be by will be through hyperchromatic polyvinyl alcohol resin film by the boric acid processing after the dyeing of dichroism pigment It is impregnated in boric acid aqueous solution to carry out.The amount of boric acid in boric acid aqueous solution is in every 100 mass parts water, and usually 2~15 Mass parts, preferably 5~12 mass parts.In the case where using iodine as dichroism pigment, the boric acid aqueous solution preferably comprises KI.The amount of KI in boric acid aqueous solution is in every 100 mass parts water, usually 0.1~15 mass parts, preferably 5 ~12 mass parts.Dip time in boric acid aqueous solution is usually 60~1200 seconds, preferably 150~600 seconds, more preferably 200~400 seconds.The temperature of boric acid aqueous solution is usually more than 50 DEG C, preferably 50~85 DEG C, more preferably 60~80 DEG C.

Polyvinyl alcohol resin film after boric acid processing is generally by carry out washing process.Washing process can for example pass through by The polyvinyl alcohol resin film immersion handled through perboric acid is carried out in water.The temperature of water in washing process is usually 5~ 40 DEG C, dip time is usually 1~120 second.Implement drying process after washing, it is possible to obtain polarizer.Drying process can be with Carried out using air drier or far infra-red heater.The temperature of drying process is usually 30~100 DEG C, preferably 40~95 DEG C, more preferably 50~90 DEG C.The time of drying process is usually 40~600 seconds, preferably 60~500 seconds, more preferably 120 ~400 seconds.

It is said, by polyvinyl alcohol resin film implement uniaxial tension, by dichroism pigment dyeing and Boric acid processing, it is possible to obtain polarizer.

Absorbance A under the wavelength 700nm of so obtained polarizer₇₀₀Preferably less than 5.5, more preferably 5.0 with Under, more preferably less than 4.5, particularly preferably less than 4.2.Absorbance A₇₀₀With the I in polarizer₅The content of complex compound It is relevant, if I₅Complex compound is excessive, then can be by I in long duration test₅Complex compound generates I₃ ^-Or I^-Iodide ion, promote polyene The reaction of change.In addition, absorbance A₇₀₀Can be more than 3.0, preferably more than 3.5, more preferably more than 3.7.If absorbance A₇₀₀It is too low, then I in long duration test₅Complex compound is destroyed, and relative amount is reduced, therefore the absorption near wavelength 700nm becomes Insufficient, red change can occur for polarizer.The absorbance A of polarizer₇₀₀Such as at washing when can manufacture polarizer by adjusting The temperature of water in reason controls.

The absorbance A of polarization plates₇₀₀The extinction photometers such as ultraviolet-uisible spectrophotometer can be used to determine, be calculated by following formula Go out.

A₇₀₀=-log [{ the TD transmissivities (%) under wavelength 700nm }/100]

As incident light, it is measured using the parallel polarised light of the absorption direction of principal axis with polarizer.It is so-called in the formula " TD transmissivities ", it is saturating when making the direction of polarised light projected from Glan thomson prism orthogonal with the axis of homology of polarizer Penetrate rate.It is, for example, possible to use the V7100 measure as the spectrophotometer with integrating sphere of Japan Spectroscopy Corporation.

In a suitable mode, it is (particularly saturating that polarization plates can be laminated with diaphragm at least one side of polarizer Bright diaphragm).Diaphragm helps to prevent the contraction of polarizer and expansion, prevented as caused by temperature, humidity, ultraviolet etc. partially Shake the deterioration of piece, therefore in the optical laminate of the present invention, at least one side preferably in polarizer, be preferably laminated with two sides Diaphragm.

It is excellent as the material, preferably clear, mechanical strength, heat endurance, and/or isotropism etc. for forming diaphragm Material.For example, the polyester such as polyethylene terephthalate and PEN based polymer, two can be enumerated The acrylic ester polymers such as the cellulose-based polymer such as acetylcellulose and triacetyl cellulose, polymethyl methacrylate, Styrenic, the makrolon based polymer such as polystyrene and acrylonitrile styrene copolymer (AS resins).In addition, The polyolefin such as polyethylene, polypropylene and ethylene propylene copolymer polymer, the ring with ring system or ENB structure The acid amides such as shape olefin polymer, vinyl chloride-based polymer, nylon and aromatic polyamide based polymer, imide series polymerization Thing, sulfone based polymer, polyether sulfone based polymer, polyether-ether-ketone based polymer, polyphenylene sulfide based polymer, ethenol system polymerization Thing, vinylidene chloride based polymer, vinyl butyral based polymer, aromatic ester based polymer, polyformaldehyde based polymer, epoxy Blend of polymer or the polymer etc. can also be enumerated as the example for the polymer for forming diaphragm.Diaphragm Heat curing-type or the ultraviolets such as acrylic ester, carbamate system, acroleic acid polyurethane system, epoxy, silicone-based can be used as The cured layer of the resin of curing type is formed.Wherein, preferably with the polymerizeing with reactive hydroxyl with isocyanate crosslinking Thing, particularly preferred cellulose-based polymer.

The thickness of diaphragm is not particularly limited, generally less than 500 μm, preferably 1~300 μm, more preferably 5~ 200 μm, more preferably 10~100 μm.In addition, diaphragm can also be accompanied with optical compensation function.

The face of diaphragm not adjacent with polarizer can also have a surface-treated layer, for example, can also have hard conating, The optical layers such as anti-reflection layer, antiblocking layers, Bewildering resistance layer or diffusion layer.These optical layers can also be pressed from both sides across described later by adhesive The adhesive phase of formation is fitted on diaphragm.

Hard conating is the layer for the purpose of preventing the damage on polarization plates surface etc., for example, can utilize by acrylic ester, The excellent solidification envelopes such as the hardness of the ultraviolet curing resins such as silicone-based, sliding properties are additional to the side on the surface of diaphragm Formula etc. is formed.Anti-reflection layer is the layer for the purpose of preventing the reflection of the ambient light at polarization plates surface, can utilize according to The formation of the antireflection film of previous methods etc. is realized.In addition, antiblocking layers be by prevent with adjacent layer it is closely sealed for the purpose of Layer.

In addition, Bewildering resistance layer is to prevent because ambient light hinders the observation of polarization plates transmitted light in the reflection of the surface of polarization plates Layer Deng for the purpose of, such as can be by using roughened mode or transparent particle based on sandblasting mode or embossing processing mode The mode such as fit system, assign minute concave-convex structure to the surface of diaphragm to be formed.As micro- in order to form the surface Thin concaveconvex structure and the particulate contained, such as it is 0.5~50 μm by silica, aluminum oxide, two that can enumerate average grain diameter The compositions such as titanium oxide, zirconium oxide, tin oxide, indium oxide, cadmium oxide, antimony oxide can with conductive inorganic system's particulate, By transparent particles such as the organic system particulates formed such as crosslinking or uncrosslinked polymer.Forming the feelings of surface minute concave-convex structure Under condition, the content of particulate is relative to the mass parts of transparent resin 100 for forming surface minute concave-convex structure, usually 2~50 mass Part, preferably 5~25 mass parts.Bewildering resistance layer can also double as being used to spread polarization plates transmitted light and expand the diffusion layer at visual angle etc. (visual angle expanded functionality etc.).

Moreover, the anti-reflection layer, antiblocking layers, diffusion layer and Bewildering resistance layer etc. except in being located at diaphragm in itself and Beyond integration, the layer discrete with diaphragm can also be separately set to as optical layer.These optical layers can also press from both sides across The adhesive phase described later formed by adhesive is fitted on diaphragm.

In the present invention, diaphragm has preferably 200g/m²More than 24 hours, more preferably 400g/m²24 hours with Upper, more preferably 600g/m²The moisture permeability of more than 24 hours.If the moisture permeability of diaphragm be above-mentioned lower limit with On, then can further suppress the present invention optical laminate xanthochromia over time.It is preferred that moisture permeability is above-mentioned lower limit The diaphragm of the value above is present at least side of polarizer, is more preferably the presence of in the both sides of polarizer.The moisture permeability of diaphragm Usually 2000g/m²Less than 24 hours.Moreover, in the present invention, moisture permeability can be in 40 DEG C of temperature, humidity 90%RH bar According to JIS Z0208 under part：1976 measure.

Polarizer can be pressed from both sides Nian Jie across bond layer with diaphragm.As the bonding agent for forming bond layer, do not have It is particularly limited to, various bonding agents can be enumerated.As bonding agent, active energy ray curable bonding agent, water system can be enumerated Bonding agent, organic solvent system bonding agent and solvent-free system's bonding agent.Wherein, from the viewpoint that formed bond layer is thinned Consider, preferably active energy ray curable bonding agent and water system bonding agent.In addition, from it is further suppress optical laminate with From the viewpoint of the xanthochromia of time passage, the layer being more preferably made up of active energy ray curable bonding agent is (following to be also referred to as " active energy ray curable bond layer "), i.e. at least one side or the polarizer of the polarization plates preferably in the polarizer Two sides, include folder across active energy ray curable bond layer stacking diaphragm.Have on the two sides of polarizer and protect In the case of cuticula, the bonding agent being coated on a surface of polarizer is viscous on another surface of polarizer with being coated on Connecing agent both can be with identical, can also be different.Pressed from both sides moreover, polarizer may not be with diaphragm across bond layer, but Pressed from both sides and be bonded across the adhesive phase described later formed by adhesive.

So-called active energy ray curable bonding agent, it is the bonding solidified by irradiation light isoreactivity energy-ray Agent.In this case, the cured layer of gained turns into bond layer.As bonding agent, can enumerate to be consolidated by cationic polymerization The epoxy based compound of change is as the active energy ray curable bonding agent of curability composition and to pass through radical polymerization And the active energy ray curable bonding agent of (methyl) acrylic compounds solidified as curability composition etc..

The example for the epoxy based compound that can suitably use includes：By being carried out to the aromatic rings of aromatic polyol Hydrogenation, hydrogenated epoxy based compound obtained by the ester ring type polyol reaction of epichlorohydrin and gained is then set (to there is alicyclic ring The glycidol ether of the polyalcohol of formula ring)；The fat such as the polyglycidyl ether of aliphatic polyol or its alkylene oxide adducts Race's epoxy based compound；As in epoxy chemical combination of the intramolecular with the epoxy radicals being bonded with ester ring type ring of more than 1 The ester ring type epoxy based compound of thing.

Active energy ray curable bonding agent can also also contain as curability composition and belong to free-radical polymerised (methyl) acrylic compounds.As (methyl) acrylic compounds, can enumerate：There is at least one (first in intramolecular Base) acryloxy (methyl) acrylate monomer；Make the compound reaction of more than two kinds containing functional group and obtain, dividing (methyl) acrylate oligomer with least two (methyl) acryloxy etc. contains (methyl) acryloxy in sub Compound.

Included in active energy ray curable bonding agent as curability composition by cationic polymerization the ring that solidifies In the case of oxygen based compound, light cationic polymerization initiator is preferably comprised.As light cationic polymerization initiator, such as can be with Enumerate aromatic diazonium salt；The salt such as aromatic iodonium salts and aromatic series sulfonium salt；Iron-arene complex etc..In addition, in activity In the case that energy ray-curable bonding agent contains the free-radical polymerised curability compositions such as (methyl) acrylic compounds, Preferably comprise optical free radical polymerization initiator.As optical free radical polymerization initiator, for example, can enumerate acetophenone series initiators, Benzophenone series initiators, benzoin ether series initiators, thioxanthones series initiators, xanthone, Fluorenone, camphorquinone, benzaldehyde, And anthraquinone etc..

Active energy ray curable bonding agent is as needed, can contain the cations such as oxetanes, polyalcohol and gather Close accelerator, sensitising agent, ion capturing agent, antioxidant, chain-transferring agent, tackifier, thermoplastic resin, filler, flowing tune Whole dose, plasticizer, defoamer, anti-static electricity interference agent, the additive such as levelling agent, and/or solvent.

In the case of using active energy ray curable bonding agent, active energy is made by irradiating active energy beam Measure the solidification of ray curing bonding agent.The light source of active energy beam is not particularly limited, and preferably has below wavelength 400nm The active energy beam of luminous distribution, specifically, preferred lower pressure mercury vapor lamp, middle medium pressure mercury lamp, high-pressure mercury-vapor lamp, high-pressure water Silver-colored lamp, chemical lamp, black light lamp, microwave-excitation mercury vapor lamp and metal halide lamp etc..

The photo-irradiation intensity of active energy ray curable bonding agent can be bonded according to active energy ray curable The composition of agent suitably determines, is not particularly limited, the exposure intensity of the effective wavelength region of activation for polymerization initiator Preferably 0.1~6000mW/cm², more preferably 10~1000mW/cm², more preferably 20~500mW/cm².If should Exposure intensity then may insure the reaction time in the scope, it is additionally possible to suppress by the hot and active energy from radiation of light source The deterioration of the xanthochromia, polarizer of epoxy resin caused by heat release when measuring the solidification of ray curing bonding agent.To active-energy As long as the light irradiation time of ray curing bonding agent is suitably selected according to the active energy ray curable bonding agent solidified Select, be not particularly limited, but it is preferred that the so that accumulative light of the product representation as above-mentioned exposure intensity and irradiation time Amount reaches 10~10000mJ/m², more preferably up to 50~1000mJ/m², further preferably reach 80~500mJ/m²Mode Setting.If the accumulative light quantity irradiated to active energy ray curable bonding agent can produce enough in the scope The spike for coming from polymerization initiator of amount, makes curing reaction more reliably carry out, in addition, irradiation time will not be long, Good productivity ratio can be maintained.

Moreover, in the case where solidifying active energy ray curable bonding agent using the irradiation of active energy beam, Such as preferably in the degree of polarization of polarizer, transmissivity and tone and the transparency of composition diaphragm and the various films of optical layer Etc polarization plates various functions will not reduce under conditions of carry out.

So-called water system bonding agent, be by bonding agent composition be dissolved in water or water and hydrophilic organic solvent (such as alcoholic solvent, Ether solvents, ester solvent etc.) in the mixed solvent bonding agent or the bonding agent that is dispersed in water bonding agent composition.As viscous Agent composition is connect, such as the bonding agent comprising polyvinyl alcohol resin or carbamate resins can be enumerated.It is moreover, so-called organic Solvent system bonding agent, it is to substitute water or the mixed solvent of water and hydrophilic organic solvent in water system bonding agent and used organic The bonding agent of solvent.

As water system bonding agent, such as polyvinyl alcohol resin bonding agent and water system two-component-type amino can be enumerated Formic acid esters system emulsion adhesive etc..In addition, as organic solvent system bonding agent, such as the carbamic acid of two-component-type can be enumerated Ester system bonding agent etc..On the other hand, as solvent-free system's bonding agent, such as one-pack type carbamate system bonding can be enumerated Agent etc..

In the case where bonding agent includes polyvinyl alcohol resin as bonding agent composition, polyvinyl alcohol resin can be Partly-hydrolysed polyvinyl alcohol, fully saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl modified is can also be in addition Polyvinyl alcohol, methylol-modified polyvinyl alcohol, amino modified polyvinyl alcohol etc. are by modified polyvinyl alcohol resin.Generally, Bonding agent using polyvinyl alcohol resin as bonding agent composition is the aqueous solution preparation as polyvinyl alcohol resin.For viscous The concentration of the polyvinyl alcohol resin in agent is connect, relative to the mass parts of water 100, usually 1~10 mass parts, preferably 1~5 matter Measure part.

In order to improve cementability, using the bonding agent of polyvinyl alcohol resin as bonding agent composition preferably comprise glyoxal, The curability compositions such as water-soluble epoxy resin and/or crosslinking agent.As water-soluble epoxy resin, such as can be suitably using making Epichlorohydrin using the reaction of the dicarboxylic acids such as the polyalkylene polyamines such as diethylenetriamines, trien and adipic acid with being obtained Daiamid reaction obtained by polyamide polyamines epoxy resin., can be with as the commercially available product of the polyamide polyamines epoxy resin Enumerate " Sumirez Resin 650 " (field ridge chemical industry (strain) system), " (the field ridge chemical industry of Sumirez Resin 675 " (strain) makes), " WS-525 " (Japanese PMC (strain) system) etc..The addition of these curability compositions and/or crosslinking agent (adds together It is its total amount in the case of adding) relative to the mass parts of polyvinyl alcohol resin 100, usually 1~100 mass parts, preferably 1 ~50 mass parts.If the addition of above-mentioned curability composition and/or crosslinking agent, in the scope, cementability improves, can To form the bond layer for showing good cementability.

In addition, in the case where including carbamate resins as bonding agent composition, preferably using Polyester ionomer Type carbamate resins and the mixture of the compound with glycidyl epoxide.Herein, so-called Polyester ionomer type Carbamate resins, it is that there is polyester backbone and imported a small amount of ionic composition (hydrophilic component) into its skeleton Carbamate resins.The ionomer type carbamate resins in water without using emulsifying agent due to being directly emulsified into breast Liquid, it is consequently adapted to the bonding agent as water system.Polyester ionomer type carbamate resins are known in itself, such as in day In this Unexamined Patent 7-97504 publications, the macromolecule dispersing agent for making phenolic aldehyde system resin be scattered in aqueous medium is reserved as Example record, in addition in Japanese Unexamined Patent Publication 2005-70140 publications and Japanese Unexamined Patent Publication 2005-208456 publications, provide Such a way, i.e. with Polyester ionomer type carbamate resins and the compound with glycidyl epoxide Mixture is bonded annular ethylene series resin film as bonding agent on the polarizer formed by polyvinyl alcohol resin.

Water-soluble chelate compound can also be included additionally as bonding agent composition.It is water-soluble contained by bonding agent constituent Property chelate compound can improve bond layer and the diaphragm such as polyethenol series polarizer and cellulose mesentery, alkene mesentery it Between the degree of cross linking and improve bonding force and water resistance.Zinc chloride, cobalt chloride, chlorination can be added as water-soluble chelate compound Magnesium, magnesium acetate, aluminum nitrate, zinc nitrate, zinc sulfate etc..Particularly from the viewpoint of durability is improved, preferably zinc chloride, nitric acid Zinc.

Bonding agent can utilize known method progress to the coating on polarizer and/or fitting diaphragm thereon, Such as can use the tape casting, Meyer rod coating method, gravure coating process, comma formula rubbing method, scraper plate method, die coating method, dip coating, Spray-on process etc..So-called the tape casting, be make as be applied the film of thing in an approximate vertical direction, general horizontal direction, or both Between incline direction movement while the method that flows down bonding agent to its surface and be allowed to expand cloth., will after coating adhesive The diaphragm of polarizer and fitting thereon is overlapping, is clamped using niproll etc. and carries out the fitting of film.Niproll is used Film is bonded such as the method that can be used the pressurization with roller after coating adhesive and equably spread out, after coating adhesive It is pressurizeed through roller and roller method spread out etc..In this case, the material of used roller can be metal, rubber Deng.In addition, between film to be passed through to multiple rollers and in the case of spreading out, multiple rollers can be identical material or difference Material.

After above-mentioned fitting, be dried and solidify bonding agent, it is hereby achieved that comprising polarizer, bond layer and The polarization plates that diaphragm forms.The drying process can for example be carried out by blowing hot blast, its temperature according to the species of solvent and It is fixed, but usually 30~200 DEG C, preferably 35~150 DEG C, more preferably 40~100 DEG C, more preferably 60~100 In the range of DEG C.In addition, drying time is usually 20~1200 seconds.

After drying, at least half a day, the maintenance preferably more than a couple of days can be implemented to bond layer in temperature more than room temperature And obtain enough adhesive strengths.Curing temperature is preferably the scope of 30~50 DEG C of scope, more preferably 35~45 DEG C.If Curing temperature is in the scope, then so-called " crimping " that is not likely to produce under reel state.Moreover, humidity during maintenance is without spy Do not limit, as long as relative humidity is in 0~70%RH scope.Curing time is usually half a day~20 day, preferably 1~ 10 days, more preferably 2~7 days.

Moreover, for polarizer and the bonding plane of diaphragm, in order to improve cementability, plasma can also be appropriately carried out Body processing, sided corona treatment, ultraviolet treatment with irradiation, flame (flame) processing, saponification process etc. are surface-treated.At saponification Reason, can enumerate the method being impregnated in the aqueous solution of the alkali such as sodium hydroxide or potassium hydroxide.

The thickness of bond layer is usually 0.001~10 μm, preferably 0.01~5 μm, more preferably 0.01~2 μm, is entered One step is preferably 0.02~1 μm.If the thickness of bond layer in the scope, may insure enough cementabilities, separately Outside, it is also preferable in appearance, the filming of polarization plates is can aid in addition, is consequently adapted to the optical laminate of the present invention.

The present invention optical laminate in, polarization plates are as needed, can also go back laminated phase-difference film, compensation film for angular field of view, The optical films such as brightness enhancement film, antiglare film, antireflection film, and/or condensing film or optical layer.These optical films and optical layer can press from both sides every The adhesive phase described later formed by adhesive to fit in polarization plates.

Phase retardation film is to show optically anisotropic optical film, as phase retardation film, can be enumerated to macromolecule material Material carries out the birefringence film that uniaxially or biaxially stretch processing forms, the alignment films of liquid crystal polymer, supports polymerizable mesogenic with film Material of the oriented layer of thing etc..Stretch processing for example can utilize roller stretching method, along long gap pulling method, tenter stretching method, Tubular type pulling method etc. is carried out.Stretching ratio is generally 1.1~3 times in the case of uniaxial tension.The thickness of phase retardation film does not have There are special limitation, generally 10~200 μm, preferably 20~100 μm.

As high polymer material, such as polyvinyl alcohol, polyvinyl butyral resin, polymethyl vinyl ether, poly- can be enumerated It is hydroxy-ethyl acrylate, hydroxyethyl cellulose, hydroxypropyl cellulose, methylcellulose, makrolon, polyarylate, polysulfones, poly- to benzene Naphthalate, PEN, polyether sulfone, polyphenylene sulfide, polyphenylene oxide, polyallyl sulfone, polyvinyl alcohol, Polyamide, polyimides, polyolefin, have the polyolefin of ENB structure, polyvinyl chloride, cellulose-based polymer or it Binary system, the various copolymers of ternary system, graft copolymer, blend etc..These high polymer materials are become by stretching etc. For orientation thing (stretched film).

As liquid crystal polymer, such as it can enumerate and import imparting liquid crystal aligning into the main chain or side chain of polymer Conjugacy the backbone chain type of linear atomic group (mesomorphic unit) or the various polymer of side chain type.Liquid crystal as backbone chain type The concrete example of polymer, it can enumerate and be bonded the structure of mesomorphic group, such as nematic in the interval base portion for assigning bendability Polyester liquid crystal polymer, plate-like polymer or cholesteric polymers of type orientation etc..Polymerizable mesogenic as side chain type The concrete example of thing, it can enumerate using polysiloxanes, polyacrylate, polymethacrylates or Crude oil ester and be used as main chain bone Frame, as side chain folder across the interval base portion formed by the atomic group of conjugacy have by nematic be orientated imparting property contraposition take Polymer in mesomorphic unit portion formed for cyclic compound unit etc..The orientation of these liquid crystal polymers for example can be by such as It is lower to operate to carry out, i.e. the surface of the film of the polyimides formed or polyvinyl alcohol etc. is rubbed on a glass Carried out after deploying the solution of liquid crystal polymer on the orientation process face of the material or oblique evaporation of the processing material of silica etc. Heat treatment.

Phase retardation film such as can be various wavelength plates or with liquid crystal layer is coloured as caused by birefringence or visual angle Compensation for the purpose of film etc. there is the film of phase difference corresponding with application target or by phase retardation film of more than two kinds It is laminated and controls film of the optical characteristics such as phase difference etc..

Compensation film for angular field of view is the film for widening visual angle, even in watching liquid crystal from the direction that is slightly slanted relative to picture In the case of the picture of display device, image can also be more clearly watched.

As such a compensation film for angular field of view, such as there are the alignment films or over the transparent substrate of phase retardation film, liquid crystal polymer etc. It is supported by film of the oriented layer of liquid crystal polymer etc. etc..Common phase retardation film uses the tool for passing through uniaxial tension along its face direction There is a birefringent polymer film, and the phase retardation film for being used as compensation film for angular field of view, drawn using twin shaft is passed through along the plane direction That stretches has birefringent polymer film, controls thickness by uniaxial tension and what thickness direction also passed through stretching along the plane direction Spend biaxial stretching film with birefringent polymer or tilted alignment film etc of the refractive index in direction etc..As tilted alignment Film, such as can enumerate and heat shrink films are bonded on polymer film and in the presence of its convergent force as caused by heating to polymerization Thing film carries out the film of stretch processing or/and shrink process, the film for making liquid crystal polymer tilted alignment etc..Original as phase retardation film Material polymers, the polymer identical polymer with illustrating in previous phase retardation film can be used, can be properly selected Using to prevent coloring caused by the change based on visual angle caused by the phase difference of liquid crystal cells etc., expand and observe excellent visual angle Polymer Deng for the purpose of.

In addition, from the viewpoint of wide viewing angle excellent from realizing, it can suitably use and utilize triacetyl cellulose Film support by the optical anisotropic layer that is formed of tilted alignment layer of the oriented layer of liquid crystal polymer, particularly plate-like polymer and Into compensation film for angular field of view.

＜ adhesive phases ＞

In the present invention, first adhesive phase and second adhesive phase are distinguished laminated configuration on the surface of polarization plates.The One adhesive phase and second adhesive phase are the layers formed by adhesive.Form the viscous of first adhesive phase and second adhesive phase Mixture both can be with identical, can also be different.

In the present invention, adhesive forms comprising resin.The species of contained resin is not particularly limited in adhesive, such as (methyl) acrylic resin, silicones, carbamate resins and rubber etc. can be enumerated.Adhesive can include single Only one or more resins.

From can by select import resin monomer species and easily to adhesive assign it is functional in terms of examine Consider, be adapted to use (methyl) acrylic resin (A) as the resin.As (methyl) acrylic resin (A), such as can Made with enumerating with coming from the construction unit of (methyl) acrylate represented with following formula (I) (following to be also referred to as " monomer (I) ") For the polymer of principal component.Moreover, in the present invention, it is so-called " to come from the construction unit of monomer (I) as the polymerization of principal component Thing ", refer to relative to form polymer entire infrastructure unit, containing preferably more than 40 mass %, more preferably 60 mass % with The upper, construction unit for coming from monomer (I) for example more than 80 mass %.In this case, relative to the whole for forming polymer Construction unit, usually contain the construction unit for coming from monomer (I) below 100 mass %, preferably below 90 mass %.

Change 1

In formula (I), R¹For hydrogen atom or methyl, R²For usual carbon number below 14, be preferably less than 10 and usually 1 Alkyl or aralkyl above.

In an embodiment of the invention, (methyl) acrylic resin (A) can come from (methyl) acrylic acid Beyond the construction unit of ester (monomer (I)), also containing other construction units, particularly contain and come from polar functional group Monomer construction unit, preferably comprise the structure list for coming from (methyl) acrylic compounds with polar functional group Member.As polar functional group, carboxyl, hydroxyl, amino and heterocyclic radical headed by epoxide ring etc. can be enumerated.As with (methyl) acrylic compounds of polar functional group, such as (methyl) acrylic acid, acrylic acid 2- (dimethylaminos can be enumerated Base) ethyl ester, (methyl) acrylic acid 2- hydroxy methacrylates and glycidyl acrylate etc..In addition, (methyl) acrylic compounds tree Fat (A) can also include the construction unit for coming from the monomer without polar functional group beyond monomer (I).As can close The construction unit (monomer) used suitablely, can enumerate to come from has 1 olefinic double bond and at least one fragrance in intramolecular The construction unit of the monomer of ring, preferably enumerate the construction unit for coming from (methyl) acrylic compounds with aromatic rings. And in this manual, so-called (methyl) acrylic acid, refer to can be acrylic or methacrylic acid any one, this Outside, it is referred to as " (methyl) " and the identical meaning during (methyl) acrylate etc..

As the R among monomer (I)²For the monomer of alkyl, more specifically, methyl acrylate, propylene can be exemplified The acrylic acid of the straight-chains such as acetoacetic ester, propyl acrylate, n-butyl acrylate, n-octyl and lauryl acrylate Arrcostab；The alkyl acrylate of the branched such as isobutyl acrylate, 2-EHA and Isooctyl acrylate monomer； Methyl methacrylate, EMA, propyl methacrylate, n-BMA, methacrylic acid are just pungent The alkyl methacrylate of the straight-chain such as ester and lauryl methacrylate；And Isobutyl methacrylate, methyl-prop The alkyl methacrylate of the branched such as olefin(e) acid 2- ethylhexyls and EHMA.

Preferred n-butyl acrylate among them, specifically, preferably comprise the whole of (methyl) acrylic resin (A) N-butyl acrylate is more than 50 mass % among construction unit (monomer), and meets the described regulation on monomer (I).

As R among monomer (I)²For the monomer of aralkyl, benzyl acrylate, metering system can be specifically exemplified Acid benzyl ester etc..

These monomers (I) can individually using or be applied in combination.

Form the R in the formula (I)²Alkyl or aralkyl can also be its hydrogen atom by group-O- (C₂H₄O)_n- R³The group that instead of.

R in the formula (I) is formed²Alkyl or aralkyl hydrogen atom by group-O- (C₂H₄O)_n- R³Substitution In the case of, n is preferably 0 or 1~4 integer, more preferably 0,1 or 2.In addition, R³The alkyl for being carbon number below 12 or Aryl, if the carbon number of alkyl is more than 3, it can be straight chain or be side chain.R is formed if enumerated³Virtue The example of base, then in addition to phenyl, naphthyl, the core alkyl substitution also comprising tolyl or xylyl, ethylphenyl etc. Phenyl, xenyl (or phenyl) etc..R³Particularly preferably these aryl.

As the R in formula (I)²For alkyl or aralkyl and R²Alkyl or aralkyl hydrogen atom by group-O- (C₂H₄O)_n- R³(methyl) acrylate of substitution, specifically, can exemplify acrylic acid 2- methoxy acrylates, acrylic acid Ethyoxyl methyl esters, acrylic acid 2- phenoxy ethyls, acrylic acid 2- (2- phenoxy groups) ethyl esters and acrylic acid 2- Alkoxy alkyl, aryloxy group alkyl base ester or the aryloxyethoxy Arrcostab of the acrylic acid such as (adjacent phenylphenoxy) ethyl ester；First Base acrylic acid 2- methoxy acrylates, methacrylic acid ethyoxyl methyl esters, methacrylic acid 2- phenoxy ethyls, methacrylic acid The alkane of the methacrylic acid such as 2- (2- phenoxy groups) ethyl esters and methacrylic acid 2- (adjacent phenylphenoxy) ethyl ester Epoxide Arrcostab, aryloxy group alkyl base ester or aryloxyethoxy Arrcostab etc..

(methyl) acrylic resin (A) of the present invention, which can also contain to come from beyond monomer (I), does not have polarity The construction unit of the monomer of functional group.As the monomer without polar functional group beyond monomer (I), can enumerate in molecule Interior (methyl) acrylate monomer with ester ring type structure, styrenic monomers, vinyl monomer, (methyl) acrylamide Derivative and there is monomer of multiple (methyl) acryloyl groups etc. in intramolecular.

(methyl) acrylate monomer in intramolecular with ester ring type structure is illustrated.So-called ester ring type structure, It is that carbon number is usually more than 5, is preferably 5~7 or so cycloalkanes hydrocarbon structure.If enumerate the propylene with ester ring type structure The concrete example of acid ester monomer, then there are isobornyl acrylate, cyclohexyl acrylate, acrylic acid bicyclopentyl ester, acrylic acid ring ten Dialkyl ester, acrylic methyl cyclohexyl, acrylic acid 3-methyl cyclohexanol ester, t-butylcyclohexyl ester, α-ethoxy propylene Sour cyclohexyl, acrylate base phenyl ester etc..In addition, if enumerate the tool of the methacrylate monomers with ester ring type structure Style, then there are isobornyl methacrylate, cyclohexyl methacrylate, methacrylic acid bicyclopentyl ester, methacrylic acid Cyclododecane base ester, methyl methacrylate base cyclohexyl, methacrylic acid 3-methyl cyclohexanol ester, t-butyl cyclohexyl Ester, methacrylic acid cyclohexyl phenyl ester etc..

If enumerating the example of styrenic monomers, in addition to styrene, also methyl styrene, dimethyl benzene second Alkene, trimethyl styrene, ethyl styrene, diethyl, triethylbenzene ethene, propylstyrene, butylstyrene, oneself The ring-alkylated styrenes such as base styrene, heptyl styrene and octyl styrene；Fluorobenzene ethene, chlorostyrene, bromstyrol, two The halogenated styrenes such as bromstyrol and iodobenzene ethene；And nitrostyrolene, acetylbenzene ethene, methoxy styrene, two Vinyl benzene etc..

If enumerating the example of vinyl monomer, there are vinyl acetate, propionate, vinyl butyrate, 2- second The fatty acid vinyl ester such as base vinyl caproate and vinyl laurate；The vinyl halides such as vinyl chloride or bromine ethene；Inclined two chloroethene The dihalo ethene partially such as alkene；The nitrogenous aromatic vinyl such as vinylpyridine, vinyl pyrrolidone and vinyl carbazole Compound；Butadiene, isoprene and chlorobutadiene equiconjugate diene monomers；And acrylonitrile, methacrylonitrile etc..

If enumerating the example of (methyl) acrylamide derivative, there are N- methylols (methyl) acrylamide, N- (2- hydroxyethyls) (methyl) acrylamide, N- (3- hydroxypropyls) (methyl) acrylamide, N- (4- hydroxybutyls) (methyl) acrylamide, N- (5- Hydroxy pentyls) (methyl) acrylamide, N- (6- hydroxyls hexyl) (methyl) acrylamide, N- (methoxy) (methyl) acrylamide, N- (ethoxyl methyl) (methyl) acrylamide, N- (propoxy methyl) (methyl) acrylamide, N- (butoxymethyl) (methyl) acrylamide, N, N- dimethyl (methyl) acrylamide, N, N- Diethyl (methyl) acrylamide, N- isopropyls (methyl) acrylamide, N- (3- dimethylaminopropyls) (methyl) propylene Acid amides, N- (1,1- dimethyl -3- oxos butyl) (methyl) acrylamide, N- (2- (2- oxo -1- imidazolidines Base) ethyl) (methyl) acrylamide, 2- Acryloyl aminos -2- methyl isophthalic acids-propane sulfonic acid etc..

If enumerating the example for the monomer that there are multiple (methyl) acryloyl groups in intramolecular, there is BDO two (methyl) acrylate, 1,6- hexylene glycols two (methyl) acrylate, 1,9- nonanediols two (methyl) acrylate, ethylene glycol Two (methyl) acrylate, diethylene glycol two (methyl) acrylate, (methyl) acrylate of tetraethylene glycol two and 3 the third two Alcohol two (methyl) acrylate etc. has the monomer of 2 (methyl) acryloyl groups in intramolecular；Trimethylolpropane tris (methyl) Acrylate etc. has monomer of 3 (methyl) acryloyl groups etc. in intramolecular.

Forming the monomer of (methyl) acrylic resin (A) can also be represented comprising of more than two kinds with above-mentioned formula (I) respectively (methyl) acrylate and the monomer and/or monomer (I) with polar functional group that use as needed beyond do not have The monomer of polarized functional group.

The weight to be converted for the polystyrene standard based on gel permeation chromatography (GPC) of resin contained in adhesive is equal Molecular weight Mw is also not particularly limited, but it is preferred that Mw is in the resin of 500,000~2,000,000 scope, it is more preferably in 500,000~ The resin of 1800000 scope.If the weight average molecular weight of polystyrene standard conversion is more than 500,000, hot and humid lower glues Connecing property improves, and the possibility for tilting or peeling off is produced between transparent panel or image-display units and adhesive phase becoming for reduction Gesture, and the trend that re-workability is also improved.In addition, if the weight average molecular weight is less than 2,000,000, even if then fitting in this The size of the diaphragm of adhesive phase changes, and adhesive phase also can follow the change in size and change, therefore in liquid crystal list There is no difference between the lightness of peripheral part and the lightness of central part of member, leakage is white, irregular colour has the trend being suppressed, Therefore preferably.It is not particularly limited with the weight average molecular weight Mw and number-average molecular weight Mn ratio Mw/Mn molecular weight distributions represented, example Such as it is preferably in 3~15 or so scope.

Contained resin can for example utilize solution polymerization process, emulsion polymerization, mass polymerization, suspension poly- in adhesive Various method manufactures known to legal grade.Can also use polymerization initiator in the manufacture of resin, its addition be relative to Total 100 mass parts of whole monomers used use 0.001~5 mass parts or so in the manufacture of resin.

As polymerization initiator, thermal polymerization or Photoepolymerizationinitiater initiater etc. can be used.As Photoepolymerizationinitiater initiater, Such as 4- (2- hydroxyl-oxethyls) phenyl (2- hydroxyl -2- propyl group) ketone etc. can be enumerated.As thermal polymerization, example Can such as enumerate 2,2 '-azodiisobutyronitrile, 2,2 '-azo double (2- methylbutyronitriles), 1,1 '-azo it is double (hexamethylene- 1- formonitrile HCNs), 2,2 '-azo double (2,4- methyl pentane nitrile), 2, double (2, the 4- dimethyl -4- methoxyl groups penta of 2 '-azo Nitrile), 2, double (2 Methylpropionic acid) dimethyl esters and 2 of 2 '-azo, the azo system such as 2 '-azo double (2- hydroxymethyls propionitrile) Compound；Lauroyl peroxide, TBHP, benzoyl peroxide, the benzoyl peroxide tert-butyl ester, hydroperoxidation are withered Alkene, di-isopropyl peroxydicarbonate, dipropyl peroxydicarbonate, new peroxide tert-butyl caprate, peroxidating neopentanoic acid uncle The organic peroxide such as butyl ester and peroxidating (3,5,5- trimethyl acetyl)；Potassium peroxydisulfate, ammonium persulfate and peroxidating Inorganic peroxides such as hydrogen etc..Alternatively, it is also possible to by and used redox series initiators of peroxide and reducing agent etc. make Used for polymerization initiator.

As the manufacture method of (methyl) acrylic resin (A), among method indicated above, preferably polymerisation in solution Method.If the concrete example for enumerating solution polymerization process illustrates, can enumerate desired monomer and organic solvent are mixed, In a nitrogen atmosphere add thermal polymerization, 40~90 DEG C or so, preferably 50~80 DEG C or so stir 3~15 hours left sides Right method.In addition, in order to control reaction, monomer, thermal polymerization can also continually or intermittently be added in polymerization Add or to be dissolved in the addition of the state of organic solvent.Herein, as organic solvent, such as toluene or dimethylbenzene etc. can be used It is aromatic hydrocarbon；The esters such as ethyl acetate or butyl acetate；The aliphatic alcohols such as propyl alcohol or isopropanol；Acetone, MEK and Ketones such as methyl iso-butyl ketone (MIBK) etc..

The adhesive that adhesive phase is formed in the present invention can also be beyond above-mentioned resin, also containing other additives. As other additives, such as crosslinking agent, silane based compound, crosslinking catalyst, weathering stabilizers, thickening can be enumerated Agent, plasticizer, softening agent, dyestuff, pigment, inorganic filler, organic acid, anti-static electricity interference agent and metal salts of organic acids etc..

In addition, coordinate active energy beam (such as ultraviolet) curable compounds into the adhesive, forming bonding It is also useful way to irradiate ultraviolet after oxidant layer and be allowed to solidify, harder adhesive phase is made.

The crosslinking agent that can be included in adhesive is that have at least two can be by resin contained in adhesive in intramolecular The compound of the functional group of crosslinking.Specifically, isocyanates based compound, epoxy based compound, metal chelating can be exemplified Compound based compound and aziridine based compound etc..

Isocyanates based compound is the compound for having at least two NCO (- NCO) in intramolecular, such as can With enumerate toluene di-isocyanate(TDI), hexamethylene diisocyanate, IPDI, XDI, Hydrogenated xylene diisocyanate, methyl diphenylene diisocyanate, hydrogenated diphenyl methane diisocyanate, the isocyanic acid of naphthalene two Ester, triphenylmethane triisocyanate etc..In addition, make the polyalcohols such as glycerine or trimethylolpropane and these isocyanates systems Isocyanates based compound is made the material of dimer, trimer etc. and can also turned into by adduct obtained by compound reaction Crosslinking agent used in adhesive.The isocyanates based compound that can also be mixed with two or more.

Epoxy based compound is the compound for having at least two epoxy radicals in intramolecular, such as can enumerate bisphenol A-type Epoxy resin, ethylene glycol diglycidylether, polyethyleneglycol diglycidylether, glycerin diglycidyl ether, glycerine three shrink Glycerin ether, 1,6- hexanediol diglycidyl ethers, trihydroxymethylpropanyltri diglycidyl ether, N, N- diglycidyl benzene Amine, N, N, N ', N '-four glycidyl group-m-xylene diamine etc..The epoxy based compound that can also be mixed with two or more.

As metallo-chelate based compound, such as can enumerate in aluminium, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium And compound of acetylacetone,2,4-pentanedione and ethyl acetoacetate etc. has been coordinated it on the polyvalent metal such as zirconium.

Aziridine based compound is that also referred to as Ethylenimine in intramolecular has at least two by 1 nitrogen-atoms and 2 The compound of the skeleton for 3 yuan of rings that carbon atom is formed, such as can enumerate diphenyl methane -4,4 '-bis- (1- aziridine acyls Amine), Toluene-2,4-diisocyanate, double (1- (the 2- methyl nitrogen third of 4- double (1- aziridine acid amides), three ethylene melamines, a phenyl-diformyl Pyridine)), three (1- '-aziridinos) phosphine oxides, hexa-methylene -1,6- double (1- aziridine acid amides), trimethylolpropane tris (β-'-aziridino propionic ester), tetramethylol methane three (β-'-aziridino propionic ester) etc..

Among these crosslinking agents, preferably using isocyanates based compound, be especially formed into making toluene di-isocyanate(TDI) with Adduct, the dimer for making toluene di-isocyanate(TDI), the trimer of toluene di-isocyanate(TDI), six methylenes obtained by polyol reaction Group diisocyanate and adduct, the dimer for making hexamethylene diisocyanate, hexa-methylene two obtained by polyol reaction The trimer of isocyanates, XDI and adduct obtained by polyol reaction, make the isocyanide of hydrogenated xylylen two Adduct, IPDI obtained by acid esters and polyol reaction, and/or make IPDI with it is more Mixture of the crosslinking agent of adduct, these isocyanates based compounds etc. obtained by first alcohol reaction.

The content of above-mentioned crosslinking agent in adhesive is usually relative to the mass parts of resin 100 contained in adhesive 0.01~5 mass parts or so, preferably 0.03~2 mass parts, more preferably 0.1~1.5 mass parts.

Pressing from both sides in the case that the optical laminate of the present invention is fitted in transparent panel (such as glass plate) by adhesive, from From the viewpoint of improving the adaptation with glass substrate, adhesive of the invention preferably comprises silane based compound.It is especially excellent Choosing makes to contain silane based compound in the resin before cooperation crosslinking agent.

As silane based compound, such as vinyltrimethoxy silane, VTES, second can be enumerated Alkenyl three (2- methoxy ethoxies) silane, 3- glycidoxypropyltrime,hoxysilanes, 3- glycidoxypropyl group first Base dimethoxysilane, 2- (3,4- epoxycyclohexyl) ethyl trimethoxy silane, 3- chloropropyl dimethoxy silicon Alkane, 3- r-chloropropyl trimethoxyl silanes, 3- methacryloxypropyl trimethoxy silanes, 3- mercaptopropyi trimethoxies Base silane, 3- glycidoxypropyltrime,hoxysilanes, 3- glycidoxypropyl groups triethoxysilane, 3- epoxies third Epoxide dimethylamine epoxide methyl-monosilane, 3- glycidoxypropyl group ethyoxyl dimethylsilanes etc..Can also use 2 kinds with On silane based compound.

Silane based compound can also be the compound of silicone oligomers type.If with (monomer)-(monomer) copolymer Form represents silicone oligomers, such as can enumerate example as follows.

3-mercaptopropyi trimethoxy silane-tetramethoxy-silicane alkyl copolymer, 3-mercaptopropyi trimethoxy silane- Tetraethoxy-silicane alkyl copolymer, 3- Mercaptopropyltriethoxysilanes-tetramethoxy-silicane alkyl copolymer and 3- sulfydryls third The copolymers containing mercaptopropyi such as ethyl triethoxy silicane alkane-tetraethoxy-silicane alkyl copolymer；

Mercapto methyl trimethoxy silane-tetramethoxy-silicane alkyl copolymer, the ethoxy of mercapto methyl trimethoxy silane-four Base silane copolymer, mercapto methyl triethoxysilane-tetramethoxy-silicane alkyl copolymer and mercapto methyl triethoxysilicane The copolymers containing mercapto methyl such as alkane-tetraethoxy-silicane alkyl copolymer；

3- methacryloxypropyl trimethoxy silanes-tetramethoxy-silicane alkyl copolymer, 3- methacryloxypropyls Base propyl trimethoxy silicane-tetraethoxy-silicane alkyl copolymer, 3- methacryloxypropyls-four Trimethoxysilane copolymer, 3- methacryloxypropyls-tetraethoxy-silicane alkyl copolymer, 3- first Base acryloxypropyl dimethoxysilane-tetramethoxy-silicane alkyl copolymer, 3- methacryloxypropyl first Base dimethoxysilane-tetraethoxy-silicane alkyl copolymer, 3- methacryloyloxypropyl methyls diethoxy silane-four Trimethoxysilane copolymer and 3- methacryloyloxypropyl methyls diethoxy silane-tetraethoxysilane copolymerization The copolymer containing methacryloxypropyl such as thing；

3- acryloxypropyls trimethoxy silane-tetramethoxy-silicane alkyl copolymer, 3- acryloxypropyls three Methoxy silane-tetraethoxy-silicane alkyl copolymer, 3- acryloxypropyls triethoxysilane-tetramethoxy-silicane are common Polymers, 3- acryloxypropyls triethoxysilane-tetraethoxy-silicane alkyl copolymer, 3- acryloxypropyls Dimethoxysilane-tetramethoxy-silicane alkyl copolymer, 3- acryloxypropyls dimethoxysilane-tetraethoxy Silane copolymer, 3- acryloxypropyls diethoxy silane-tetramethoxy-silicane alkyl copolymer and 3- propylene The copolymers containing acryloxypropyl such as methyl diethoxy silane-tetraethoxy-silicane alkyl copolymer；

Vinyltrimethoxy silane-tetramethoxy-silicane alkyl copolymer, vinyltrimethoxy silane-tetraethoxy-silicane Alkyl copolymer, VTES-tetramethoxy-silicane alkyl copolymer, VTES-tetraethoxy Silane copolymer, vinyl methyl dimethoxysilane-tetramethoxy-silicane alkyl copolymer, vinyl methyl dimethoxy silicon Alkane-tetraethoxy-silicane alkyl copolymer, vinyl methyl diethoxy silane-tetramethoxy-silicane alkyl copolymer and vinyl Copolymers containing vinyl such as methyldiethoxysilane-tetraethoxy-silicane alkyl copolymer etc..

These silane based compounds are liquid as a rule.The content of silane based compound in adhesive relative to The contained mass parts of resin 100 in adhesive, usually 0.01~10 mass parts or so, preferably 0.03~2 mass parts, enter one Step is preferably 0.03~1 mass parts.

The thickness of first adhesive phase and the thickness of second adhesive phase both can with it is mutually the same can also be different.First is viscous The thickness of mixture layer and the thickness of second adhesive phase are shown as before explained, with the relation of the thickness of polarizer (T2), only The ratio (T2/T1) for wanting the gross thickness T1 and T2 of whole adhesive phases in optical laminate is less than 0.6, then each independent Ground suitably determines.

In one embodiment, optical laminate of the invention can press from both sides fitted in across first adhesive phase it is described later Image-display units, it can also press from both sides and fit in transparent panel described later across second adhesive phase.Now, the thickness of second adhesive phase Spending both can be with identical with the thickness of first adhesive phase, can also be different, and the thickness of second adhesive phase can also be more than first The thickness of adhesive phase.

Consider from viewpoints such as the xanthochromias for suppressing optical laminate, the thickness of first adhesive phase (cell side adhesive phase) is excellent Elect more than 3 μm, more preferably more than 5 μm, more preferably more than 10 μm as, examined from the viewpoint such as thin layer of optical laminate Consider, preferably less than 30 μm, more preferably less than 27 μm, more preferably less than 25 μm.In addition, from suppress optical laminate The viewpoint such as xanthochromia consider that the thickness of second adhesive phase (transparent panel side adhesive phase) is preferably more than 20 μm, more preferably More than 30 μm, more preferably more than 40 μm, consider from the viewpoint such as thin layer of optical laminate, preferably less than 300 μm, More preferably less than 280 μm, more preferably less than 250 μm.Moreover, in optical laminate comprising first adhesive phase and In the case of adhesive phase (also referred to as " other adhesive phases ") beyond second adhesive phase, from suppression optical laminate The viewpoints such as xanthochromia consider that other adhesive phases are respectively preferably more than 3 μm, more preferably more than 5 μm, from optical laminate The viewpoint such as thin layer consider, preferably less than 30 μm, more preferably less than 25 μm.

, can also be in the opposite with polarization plates of first adhesive phase and second adhesive phase in the optical laminate of the present invention The face of side, the screening glass that can be peeled off is fitted with respectively.Screening glass is in order at protection and optical laminate and image is shown into list The piece that the exposed surface of adhesive phase before member or transparent panel fitting uses from the purpose damaged and polluted, peels off protection Piece, such as first adhesive phase is fitted in into image-display units, second adhesive phase is fitted in into transparent panel, thus can Form the image display device of the present invention.That is, first adhesive phase and second adhesive phase load aobvious in which can not be removed Showing device.

As the material of composition screening glass, such as thermoplastic resin can be enumerated, such as polyvinyl resin, acrylic resin Deng vistanex；The polyester resin such as polyethylene terephthalate and PEN；Polycarbonate resin； (methyl) acrylic resin etc..

The optical laminate of the present invention for example presss from both sides is bonded to transparent panel and image-display units across above-mentioned adhesive phase Between after use.Transparent panel is to play the warpage for suppressing the image-display units such as liquid crystal cells or protection image-display units (preferably optically transparent) plate body of the component of effect, for example, translucency.Transparent panel can be single layer structure, also may be used To be sandwich construction.Transparent panel is sometimes referred to as transparent front panel.As image-display units, liquid crystal cells (member can be enumerated Part) and organic EL units (element) etc..

Transparent panel is configured at outmost surface in the end article of the optical laminate comprising the present invention, therefore it is required that in room Sufficient durability is also showed that during outer or half outdoor application.Consider from such a viewpoint, transparent panel preferably by glass or strengthens glass The inorganic material such as glass, the polymeric membrane that Young's modulus is more than 2GPa are formed.The inorganic material such as glass and strengthened glass are suitably for, Be suitably for polymeric membrane especially as flexible display purposes, wherein particularly preferably by polycarbonate resin (Young's modulus 2~ 3GPa), acrylic resin (3~4GPa of Young's modulus), polyimide resin (3~5GPa of Young's modulus), polyethersulfone resin (2~3GPa of Young's modulus) is formed.

Above-mentioned transparent panel can also have display in color filter layer or TFT layer, touch panel transparent electrode layer or It is printed with glass, the polymeric membrane of decorative layer.I.e., in an embodiment of the invention, the transparent panel can be at it extremely Few side has the patterned layer of more than 1 being selected from following (A)~(D).

(A) color filter layer

(B) TFT layer

(C) transparent electrode layer

(D) decorative layer

For the mode of touch panel, it is not particularly limited, electrostatic capacitance mode, surface acoustic wave side can be exemplified Formula, resistive film mode, way of electromagnetic induction, optical sensor mode, infrared mode etc..The transparent panel can also have counnter attack Penetrate, be antifouling, the adjustment of electromagnetic wave shielding, near-infrared shielding, color or the function such as anti-splashing glass.With the transparent of the function Plate for example can be the structure at least one side that film layer more than at least one with these functions is laminated in above-mentioned transparent panel Part.

Transparent panel and polarization plates are integrated with image-display units can be by the way that they be pressed from both sides across above-mentioned adhesive phase It is bonded to realize, thus, it is possible to which the image display device for providing the optical laminate comprising the present invention is (also referred to as " of the invention Image display device ").In the image display device, in order to eliminate reflection or the light in the interface of transparent panel and polarization plates Scattering, improve observation property, the preferably refractive index of adhesive and the refractive index of transparent panel is close or same.The figure of the present invention Xanthochromia occurs over time as display device can suppress image displaying part (display), can embody steady in a long-term Image display function.

The optical laminate and image display device of the present invention can be used for TV, PC, portable phone or flat board The mobile device purposes such as terminal, additionally due to the high inhibition to the xanthochromia under hot environment, can embody for a long time Stable image display function, therefore can especially be suitably used for being easily exposed to vehicle-mounted under harsher temperature conditionss Purposes.As vehicle-mounted purposes, such as guider, speed counter, idle call touch panel, reverse monitor and backsight can be enumerated Image display device used etc. in monitor etc..

[embodiment]

Embodiment and comparative example are enumerated below, and the present invention is described in more detail.

1. the making of polarizer (1)

Thick 60 μm polyvinyl alcohol film (99.9 moles of average degree of polymerization about 2400, saponification degree more than %) is drawn using dry type It is about 5 times to stretch longitudinal uniaxial tension, then keeps tense situation constant, after being impregnated 1 minute in 60 DEG C of pure water, in iodine/iodine The mass ratio for changing potassium/water is to be impregnated 60 seconds in 0.05/5/100 28 DEG C of the aqueous solution.Thereafter, in the matter of KI/boric acid/water Amount ratio is to be impregnated 300 seconds in 8.5/8.5/100 72 DEG C of the aqueous solution.Next after cleaning 20 seconds with 26 DEG C of pure water, 65 DEG C carry out drying process in 60 seconds, obtain the polarizer (1) of 23 μm of thickness that iodine is adsorbed with polyvinyl alcohol film and has been orientated.Polarization Absorbance A under the wavelength 700nm of piece (1)₇₀₀For 4.0.

2. the making of polarizer (2)

Having used thick 30 μm polyvinyl alcohol film except the thick 60 μm polyvinyl alcohol film of substitution, (average degree of polymerization is about 2400th, 99.9 moles of more than % of saponification degree) beyond, it is identical with the making of polarizer (1), obtain being adsorbed with polyvinyl alcohol film The polarizer (2) of iodine and 12 μm of thickness being orientated.Absorbance A under the wavelength 700nm of polarizer (2)₇₀₀For 4.0.

3. the making of polarizer (3)

Having used thick 75 μm polyvinyl alcohol film except the thick 60 μm polyvinyl alcohol film of substitution, (average degree of polymerization is about 2400th, 99.9 moles of more than % of saponification degree) beyond, it is identical with the making of polarizer (1), obtain being adsorbed with polyvinyl alcohol film The polarizer (3) of iodine and 28 μm of thickness being orientated.Absorbance A under the wavelength 700nm of polarizer (3)₇₀₀For 4.0.

4. the making of polarizer (4)

It is identical with " making of polarizer (2) " in addition to the temperature of pure water when cleaning is changed into 21 DEG C, obtain The polarizer (4) of 12 μm of the thickness that iodine is adsorbed with polyvinyl alcohol film and has been orientated.Extinction under the wavelength 700nm of polarizer (4) Spend A₇₀₀For 3.3.

5. the making of polarizer (5)

It is identical with " making of polarizer (2) " in addition to the temperature of pure water when cleaning is changed into 34 DEG C, obtain The polarizer (5) of 12 μm of the thickness that iodine is adsorbed with polyvinyl alcohol film and has been orientated.Extinction under the wavelength 700nm of polarizer (5) Spend A₇₀₀For 4.7.

6. the preparation of water system bonding agent

Relative to the mass parts of water 100, carboxy-modified polyvinyl alcohol ((strain) Kuraray " KL- of 3 mass parts of dissolving 318 "), polyvinyl alcohol water solution is prepared.Then, by relative to the mass parts of water 100 in the solution, into the aqueous solution Add water soluble polyamide polyamine epoxy (" Sumirez Resin 650 (30) ", the solid of field ridge chemical industry (strain) system The mass % of constituent concentration 30) 1.5 mass parts and mix, and obtain water system bonding agent.

The preparation of ultraviolet 7. (active energy beam) curing type bonding agent

As curability composition, by following 20 parts of 80 parts of alicyclic epoxy resin (a1) and aliphatic epoxy resin (a2) Mixing, solid constituent addition 4.5 parts of light cationic polymerization initiator of mixing is re-used as, prepares ultraviolet hardening bonding agent.

Alicyclic epoxy resin (a1)：3,4- epoxycyclohexyl-methyls 3,4- 7-oxa-bicyclo[4.1.0 formic acid esters：Daicel " CELLOXIDE (registration mark) 2021P " of chemical industry (strain) system

Aliphatic epoxy resin (a2)：BDDE：Nagase ChemteX (strain) systems " Denacol (registration mark) EX-121 "

Change 2

(a1)

(a2)

Light cationic polymerization initiator：Triarylsulfonium salt system light cationic polymerization initiator：50% propylene carbonate is molten " CPI-100P " of liquid, SAN-APRO (strain) systems

[embodiment 1]

On the two sides of polarizer (1), above-mentioned water system bonding agent is coated with, (Fujipla (strain) makes using laminating apparatus " LPA3301 "), the one side in polarizer (1), press from both sides across water system bonding agent, as diaphragm, be bonded and electricity is implemented to binding face The tri acetyl cellulose membrane (TAC) of 40 μm of the thickness of dizzy processing is (" KC4UA " of Konica Minolta Opto (strain) company system, thoroughly Humidity：830g/m²24 hours), the another side in polarizer (1), press from both sides across water system bonding agent, be bonded and binding face is implemented Norbornene resin (" ZEONOR ", the moisture-inhibiting of Japanese ZEON (strain) system without 23 μm stretched of thickness of sided corona treatment Degree：20g/m²24 hours).Thereafter, after 80 DEG C of dryings for carrying out 5 minutes, conserved 72 hours in 40 DEG C, 23%RH.Maintenance Afterwards, by using above-mentioned laminating apparatus to be coated with the acrylic adhesives (P- of LINTEC (strain) systems on ZEONOR faces 119E), the first adhesive phase that thickness is 20 μm is formed.In addition, by being coated with TAC surface sides using above-mentioned laminating apparatus Acrylic adhesives (P-119E of LINTEC (strain) systems), and form the second adhesive phase that thickness is 20 μm.Thus, obtain To optical laminate (1).

Now, gross thickness (the i.e. first adhesive phase and the second bonding of whole adhesive phases in optical laminate (1) The gross thickness of oxidant layer) T1 is 40 μm, the thickness T2 of polarizer is 23 μm, T2/T1 0.58.

[embodiment 2]

In addition to substitution polarizer (1) has used polarizer (2), optical laminate is obtained same as Example 1ly (2).Now, gross thickness (the i.e. first adhesive phase and second adhesive phase of whole adhesive phases in optical laminate (2) Gross thickness) T1 is 40 μm, the thickness T2 of polarizer is 12 μm, T2/T1 0.30.

[embodiment 3]

In addition to the thickness of second adhesive phase is set into 40 μm, optical laminate is obtained same as Example 1ly (3).Now, gross thickness (the i.e. first adhesive phase and second adhesive phase of whole adhesive phases in optical laminate (3) Gross thickness) T1 is 60 μm, the thickness T2 of polarizer is 23 μm, T2/T1 0.38.

[embodiment 4]

In thick 40 μm tri acetyl cellulose membrane (TAC) (" KC4UA " of Konica Minolta Opto (strain) company system) One side, using bar coater, ultraviolet hardening bonding agent is coated with a manner of the thickness after making solidification is about 2 μm.At this On coated face, polarizer (1) has been bonded.Then, to norbornene resin (the Japanese ZEON of no 23 μm stretched of thickness " ZEONOR " of (strain) system) one side implement Corona discharge Treatment, in the Corona discharge Treatment face, so that the thickness after solidification is About 2 μm of mode, above-mentioned ultraviolet hardening bonding agent is coated with using bar coater.By in the coated face, with polarizer side It is fitted in one side and is fitted with the polarizer of above-mentioned tri acetyl cellulose membrane, and produces sandwich.From the triacetyl of the sandwich Cellulose membrane side, using the ultraviolet lamp with conveyer belt, (lamp uses " the D lamps of Fusion UV Systyms company systems Pipe ") so that accumulative light quantity is 250mJ/cm²Mode irradiate ultraviolet, make ultraviolet hardening bonding agent solidify.

Thereafter, by ZEONOR surface sides, using laminating apparatus (" LPA3301 " of Fujipla (strain) systems) coating propylene Acrylic binder (P-119E of LINTEC (strain) systems), and form the first adhesive phase that thickness is 20 μm.In addition, by TAC surface sides form thickness using above-mentioned laminating apparatus coating acrylic adhesives (P-119E of LINTEC (strain) systems) For 20 μm of second adhesive phase.Thus, optical laminate (4) is obtained.

Now, gross thickness (the i.e. first adhesive phase and the second bonding of whole adhesive phases in optical laminate (4) The gross thickness of oxidant layer) T1 is 40 μm, the thickness T2 of polarizer is 23 μm, T2/T1 0.58.

[embodiment 5]

By the one side in polarizer (1), laminating apparatus (" LPA3301 " of Fujipla (strain) systems) coating propylene is used Acrylic binder (P-119E of LINTEC (strain) systems), and form the first adhesive phase that thickness is 20 μm.In addition, by The another side of polarizer (1), the acrylic adhesives (P- of LINTEC (strain) systems is coated with using above-mentioned laminating apparatus 119E), the second adhesive phase that thickness is 20 μm is formed.Thus, optical laminate (5) is obtained.

Now, gross thickness (the i.e. first adhesive phase and the second bonding of whole adhesive phases in optical laminate (5) The gross thickness of oxidant layer) T1 is 40 μm, the thickness T2 of polarizer is 23 μm, T2/T1 0.58.

[embodiment 6]

In addition to substitution polarizer (1) has used polarizer (2), optical laminate is obtained same as Example 5ly (6).Now, gross thickness (the i.e. first adhesive phase and second adhesive phase of whole adhesive phases in optical laminate (6) Gross thickness) T1 is 40 μm, the thickness T2 of polarizer is 12 μm, T2/T1 0.30.

[embodiment 7]

In addition to the thickness of second adhesive phase is set into 40 μm, optical laminate is obtained same as Example 5ly (7).Now, gross thickness (the i.e. first adhesive phase and second adhesive phase of whole adhesive phases in optical laminate (7) Gross thickness) T1 is 60 μm, the thickness T2 of polarizer is 23 μm, T2/T1 0.38.

[comparative example 1]

In addition to substitution polarizer (1) has used polarizer (3), optical laminate is obtained same as Example 1ly (8).Now, gross thickness (the i.e. first adhesive phase and second adhesive phase of whole adhesive phases in optical laminate (8) Gross thickness) T1 is 40 μm, the thickness T2 of polarizer is 28 μm, T2/T1 0.70.

[embodiment 8]

In addition to substitution polarizer (1) has used polarizer (4), optical laminate is obtained same as Example 1ly (9).Now, gross thickness (the i.e. first adhesive phase and second adhesive phase of whole adhesive phases in optical laminate (9) Gross thickness) T1 is 40 μm, the thickness T2 of polarizer is 12 μm, T2/T1 0.30.

[embodiment 9]

In addition to substitution polarizer (1) has used polarizer (5), optical laminate is obtained same as Example 1ly (10).Now, gross thickness (the i.e. first adhesive phase and second adhesive of whole adhesive phases in optical laminate (10) The gross thickness of layer) T1 is 40 μm, the thickness T2 of polarizer is 12 μm, T2/T1 0.30.

[reference example 1]

In addition to not forming second adhesive phase, optical laminate (11) is obtained identically with comparative example 1.T1 is 20 μ M, the thickness T2 of polarizer is 28 μm, T2/T1 1.40.

[xanthochromia evaluates (105 DEG C)]

Optical laminate (1)~(10) obtained in embodiment 1~9 and comparative example 1 are cut as 30mm × 30mm respectively Size, by first adhesive phase and the respective surface of second adhesive phase fit in alkali-free glass (Corning company systems " EAGLE XG "), thus produce evaluation sample.In addition, the optical laminate (11) obtained in reference example 1 is cut as 30mm × 30mm size, the surface of first adhesive phase is fitted in into alkali-free glass (Corning company systems " EAGLE XG "), by This produces evaluation sample.

To the evaluation sample in temperature 50 C, pressure 5kg/cm²Implement steam pressure processing in 1 hour under conditions of (490.3kPa) Afterwards, placed 24 hours in the environment of 23 DEG C of temperature, relative humidity 55%.Thereafter, carry out under the heating environment of 105 DEG C of temperature The heat run of keeping 100 hours, visually confirms to heat the change of front and rear color.Setting for change will be there is no For A, the change that can slightly confirm color is set to B, by can be in the area of the half or so in polarization plate face Confirm color change is set to C, and D is set to by what the substantially comprehensive middle color polarized in plate face was widely varied.By gained As a result it is shown in table 1.

Moreover, the evaluation sample comprising the optical laminate (11) produced in reference example 1 in side due to being only laminated with Alkali-free glass, thus it is polyoxyalkylene without producing, so color change does not occur, evaluation result A.

[xanthochromia evaluates (95 DEG C)]

It is same as described above, using the optical laminate (1) obtained in embodiment 1~9 and comparative example 1 and reference example 1~ (10) evaluation sample is produced.To the evaluation sample in temperature 50 C, pressure 5kg/cm²Implement 1 under conditions of (490.3kPa) After hour steam pressure processing, placed 24 hours in the environment of 23 DEG C of temperature, relative humidity 55%.Thereafter, carry out in 95 DEG C of temperature Heating environment under take care of the heat run of 100 hours, visually confirm to heat the change of front and rear color.Will substantially What is do not changed is set to A, and the change that can slightly confirm color is set into B, will can polarize the half in plate face Color change is confirmed in the area of left and right is set to C, is set what the substantially comprehensive middle color polarized in plate face was widely varied For D.The result of gained is shown in table 1.

Moreover, the evaluation sample comprising the optical laminate (11) produced in reference example 1 in side due to being only laminated with Alkali-free glass, thus it is polyoxyalkylene without producing, so color change does not occur, evaluation result A.

[red change evaluation]

By optical laminate (1)~(10) obtained in embodiment 1~9 and comparative example 1 cut respectively for 150mm × 100mm size, first adhesive phase and the respective surface of second adhesive phase are fitted in into alkali-free glass (Corning companies System " EAGLE XG "), thus produce evaluation sample.In addition, by the optical laminate (11) obtained in reference example 1 cut for 30mm × 30mm size, the surface of first adhesive phase is fitted in into the alkali-free glass (" EAGLE of Corning company systems XG "), thus produce evaluation sample.

Thereafter, enter to be about to evaluate the heat run that sample is taken care of 30 minutes under the heating environment of 105 DEG C of temperature, heating It is front and rear, visually confirm the change of the red degree that comes off in the state of crossed Nicol.Before and after heating substantially Do not change and be set to A without red change, by can slightly be confirmed after heating red come off be set to B, will heat Can clearly confirm afterwards red come off be set to C, by can confirm that when heating it is obvious it is red come off be set to D.The result of gained is shown in table 1.

[table 1]

The gross thickness T1 of thickness T2 and first and second adhesive phase of polarizer ratio (T2/T1) be less than 0.6, And the thickness T2 of polarizer is in the optical laminate of less than 23 μm of embodiment 1~9, is not likely to produce exposed to hot environment Xanthochromia after lower.On the other hand, in the optical laminate that T2/T1 is more than comparative examples 1 of the 0.6, T2 more than 23 μm, at 95 DEG C Color change is observed in xanthochromia evaluation, in addition substantially comprehensive middle color in 105 DEG C of xanthochromia evaluation in polarization plate face It is widely varied, finds because xanthochromia significantly occurs under hot environment.Moreover, do not possess second adhesive phase, Only in the optical laminate for the reference example 1 that the one side of optical laminate is covered by glass plate, do not produce exposed to hot environment Xanthochromia after lower.

The explanation of symbol

1 polarizer, 2 first adhesive phases, 2 ' second adhesive phases, 3 diaphragms, 4 bond layers, 5 screening glass, 6 is transparent Plate, 7 image-display units, 10 polarization plates.

Claims (5)

1. a kind of optical laminate, it is the optics stacking for possessing first adhesive phase, polarization plates and second adhesive phase successively Body,

The polarization plates include the polarizer that thickness is less than 23 μm and formed, and the polarizer is the polyethylene for including dichroism pigment Alcohol resin film,

The gross thickness of whole adhesive phases contained in the optical laminate is being set to T1, the thickness by the polarizer When being set to T2, T2/T1 is less than 0.6.

2. optical laminate according to claim 1, wherein,

Absorbance A under the wavelength 700nm of the polarizer₇₀₀For less than 5.5.

3. optical laminate according to claim 1 or 2, it is pressed from both sides fits in transparent panel and figure across described adhesive layer As being used between display unit.

4. according to optical laminate according to any one of claims 1 to 3, wherein,

The polarization plates have 200g/m comprising at least one side for being laminated in the polarizer²The moisture permeability of more than 24 hours Diaphragm.

5. a kind of image display device, it includes optical laminate according to any one of claims 1 to 4.