CN108230900A - Image display device - Google Patents
Image display device Download PDFInfo
- Publication number
- CN108230900A CN108230900A CN201711376423.3A CN201711376423A CN108230900A CN 108230900 A CN108230900 A CN 108230900A CN 201711376423 A CN201711376423 A CN 201711376423A CN 108230900 A CN108230900 A CN 108230900A
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- CN
- China
- Prior art keywords
- bonding sheet
- adhesive
- transparent
- image display
- polarization plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/868—Arrangements for polarized light emission
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
Abstract
The present invention relates to image display devices.In image display device (100), transparent film base material (25) is fitted with via the first bonding sheet (21) in the polarization plates (10) for be set to the surface of image-display units (50), is fitted with the transparent resin plate (71) of front transparent component (70) via the second bonding sheet (22) on transparent film base material (25).The thickness of second bonding sheet is 50 μm or more, and the store elastic modulus at 105 DEG C of the adhesive in the part being bonded with front transparent component of the second bonding sheet is 3 × 104More than Pa.Store elastic modulus at 25 DEG C of second bonding sheet is more than the store elastic modulus at 25 DEG C of the first bonding sheet.
Description
Technical field
The present invention relates to the figures in the front of image display panel with front transparents components such as transparent panel or touch panels
As display device.
Background technology
Liquid crystal display device or organic electroluminescent (EL) display device are widely used as mobile phone, automobile navigation apparatus, individual
The various image display devices of computer monitor, television set etc..The image as caused by from the impact of outer surface in order to prevent
Breakage of display panel etc., sometimes in the visuognosis side of image display panel setting front transparent plate (also referred to as " window layer "
Deng).In addition, in recent years, the equipment for having touch panel in the visuognosis side of image display panel is popularized.
Method as the front configuration front transparent plate in image display panel, it is proposed that will be configured via adhesive
" interlayer interstitital texture " that the polarization plates of the outmost surface of image display panel are bonded with front transparent plate (such as patent document
1).In addition, in the case that touch panel is configured at the positive of image display panel, also use using adhesive to polarization plates
The composition of interlayer filling is carried out with touch panel.In interlayer interstitital texture, between image display panel and front transparent component
It is filled by adhesive, therefore, the refractive index difference at interface is reduced, and can inhibit the visibility caused by reflecting or scattering
It reduces.In recent years, it is widely used to use in the mobile display purposes mostly in the mobile phone of outdoor application, smart mobile phone etc.
The interlayer interstitital texture of adhesive.
Due to the raising of the requirement to visibility, it also studied and adopt in the vehicle-mounted display such as automobile navigation apparatus
With the composition for carrying out interlayer filling to image display panel and front transparent component using adhesive.In general, and mobile display
(モ バ イ Le with デ ィ ス プ レ イ) is compared, the durability under higher temperature is required in vehicle-mounted display, in recent years,
Ask the deterioration for also not generating display performance after 100 DEG C or more of high temperature endurance test.
The image display device that adhesive will be used to have carried out interlayer filling to image display panel and front transparent component
During prolonged high temperature endurance test required for vehicle-mounted display, the polarization plates of image display panel are formed sometimes
The decrease in transmission of central portion in face.The reduction for thinking the transmissivity of polarization plates is since the delay of the moisture under hot environment is led
It causes to become catalyst from the acid of the separate outs such as polarizer protecting film, causes to form the polyvinyl alcohol dehydration of polarizer and generate more
Alkene (such as patent document 2).
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2011-219665 bulletins
Patent document 2：Japanese Unexamined Patent Publication 2014-102353 bulletins
Invention content
Problems to be solved by the invention
The inventors discovered that in the image display device formed with the interlayer filling using adhesive, tree is being used
In the case of the front transparent plate of fat, it can also inhibit the reduction of the transmissivity of polarization plates even in a high temperature environment.It is another
Aspect, in the case where using the front transparent plate of resin, after heat run at high temperature, from releasing for front transparent plate
Gas leads to the reduction of visibility as bubble residence at the interface of front transparent plate and bonding sheet sometimes.In addition, resin
The front transparent plate of system easily generates warpage due to temperature change, generates adhesive with the warpage of front transparent plate sometimes
Stripping.
In view of the foregoing, the purpose of the present invention is to provide even if in the case where being exposed to hot environment for a long time
Do not allow to be also easy to produce the deterioration of polarization plates and do not allow to be also easy to produce in for the adhesive that is bonded of the polarization plates with front transparent component
Bubble be mixed into and the image display device of the stripping of front transparent component as caused by warpage.
Means for solving the problems
The present invention relates to will have the image display panel of polarization plates and front transparent structure on the surface of image-display units
Image display device obtained from part integration.It is fitted in the polarization plates of image display panel via the first bonding sheet transparent
Film base material is fitted with front transparent component on transparent film base material via the second bonding sheet.Transparent component includes transparent resin plate,
Transparent resin plate is contacted with the second bonding sheet.The thickness of second bonding sheet is 50 μm or more, and the second bonding sheet is saturating with front
Store elastic modulus at 105 DEG C of adhesive in the part of bright component fitting is 3 × 104More than Pa.
Store elastic modulus at 25 DEG C of second bonding sheet is more than the store elastic modulus at 25 DEG C of the first bonding sheet.
Store elastic modulus at 25 DEG C of second bonding sheet is preferably 1 × 104More than Pa.Energy storage at 105 DEG C of second bonding sheet
Elasticity modulus is preferably 2 × 105Below Pa.
The thickness of first bonding sheet is preferably 5 μm~50 μm.The thickness d of first bonding sheet1Preferably the second bonding sheet
Thickness d2Less than 0.5 times.
Invention effect
In the image display device of the present invention, using transparent resin plate as front transparent component, therefore, even if in length
In the case that time is exposed to hot environment, it can also inhibit delay of the moisture in polarization plates, the more of polarizer can be inhibited
Deterioration caused by alkylene etc..Image display panel has with front transparent component via on the surface of transparent film base material and the back side
The bonding sheet with base material of the different bonding sheet of store elastic modulus is bonded, therefore can inhibit origin self-induced transparency resin plate
Outgassing caused by the delay of bubble and the warpage of transparent resin plate.
Description of the drawings
Fig. 1 is the sectional view for an embodiment for schematically showing image display device.
Fig. 2 is the sectional view that the stacking for the polarization plates for schematically showing double-sides belt adhesive is formed.
Fig. 3 is to schematically show the sectional view that the stacking of the laminate adhesive piece with base material is formed.
Reference numeral
10 polarization plates
11 polarizers
12nd, 13 transparent protective film
The 20 laminate adhesive pieces with base material
21st, 22,30 bonding sheet
25 transparent film base materials
41st, 42,43 screening glass
The polarization plates of 80 double-sides belt adhesives
50 image-display units
60 image display panels
70 front transparent components
71 transparent resin plates
76 printing layers
100 image display devices
Specific embodiment
Fig. 1 is the schematic cross sectional views for a mode for representing the image display device of the present invention.Image display device 100
With image display panel 60 and front transparent component 70.In image display panel 60, distinguished in the vision of image-display units 50
Side surface is recognized with polarization plates 10.
Transparent film base material 25, image are configured between the polarization plates 10 of image display panel 60 and front transparent component 70
The polarization plates 10 of display panel 60 are bonded with transparent film base material 25 via the first bonding sheet 21, transparent film base material 25 and front
Transparent component 70 is bonded via the second bonding sheet 22.In this way, in image display device 100, image display panel 60 with
Front transparent component 70 is integrated in the fitting of bonding sheet 21,22 on the two sides of transparent film base material 25 by being configured.
[image display panel]
(image-display units)
The image-display units 50 of image display panel 60 are, for example, liquid crystal cells or organic EL units.In LCD display
In plate, the polarization plates for being arranged on the visuognosis side of liquid crystal cells are adjusted according to the polarization state of the light through liquid crystal cells
Penetrate rate.In organic EL panel, by setting circularly polarizing plate in the visuognosis side of organic EL panel, it can shield by organic EL
The extraneous light of the metal electrode layer reflection of unit improves the visibility of display to the outgoing of visuognosis side.
(polarization plates)
The polarization plates 10 for being arranged on the visuognosis side surface of image-display units 50 include polarizer 11.Polarizer 11 is
Polyvinyl alcohol film containing the dichroic materials such as iodine or dichroic dye.As the polyvinyl alcohol film applied in polarizer
For material, polyvinyl alcohol or derivatives thereof is used.For the derivative of polyvinyl alcohol, in addition to polyvinyl alcohol can be enumerated
Other than formal, Pioloform, polyvinyl acetal etc., it can also enumerate with the alkene such as ethylene, propylene, acrylic acid, methacrylic acid, crotons
The compound that the unsaturated carboxylic acids such as acid and its Arrcostab, acrylamide etc. are modified.Polyvinyl alcohol is usually using the degree of polymerization
About 1000~about 10000, the polyvinyl alcohol of about 80 moles of %~about 100 mole % of saponification degree.
By the dyeing and stretching carried out to the implementation of polyvinyl alcohol film using dichroic material, polarizer is obtained.As
Polarizer 11 can also use the slim polarizer that thickness is less than 10 μm.For slim polarizer, it can enumerate for example
Japanese Unexamined Patent Application 51-069644 bulletins, Japanese Unexamined Patent Publication 2000-338329 bulletins, WO2010/100917 separate editions, day
Polarizer described in No. 4751481 No. 4691205 specification of this patent, Japanese Patent No. specifications etc..It is such slim
Polarizer for example can be by comprising polyvinyl alcohol resin layer be drawn with stretching with resin base material with the state of laminated body
The process and the preparation method of the process dyed using dichroic materials such as iodine stretched and obtain.
In polarization plates 10, preferably there is the transparent protective film 12,13 abutted with polarizer 11.Polarizer 11 with it is transparency protected
Film 12,13 is bonded preferably via appropriate adhesive (not shown).It, can be with for the material for forming transparent protective film
Enumerate the thermoplastic resin of such as transparency, mechanical strength and excellent heat stability.As the specific of such thermoplastic resin
Example for, can enumerate the cellulosic resins such as triacetyl cellulose, polyester resin, polyether sulfone resin, polysulfones resinoid,
Polycarbonate resin, polyamide-based resin, polyimide based resin, polyolefin resin, (methyl) acrylic resin, ring
Shape polyolefin resin (norbornene resin), polyarylate resinoid, polystyrene resins, polyvinyl alcohol resin and it
Mixture.
In the case that on the two sides of polarizer 11, transparent protective film 12,13 is set, the transparent protective film at surface and the back side
Material may be the same or different.As the figure that polarizer 11 is arranged on the purpose of expansion for optical compensation or visual angle
As the transparent protective film 13 of 50 side of display unit, the optical anisotropic films such as phase difference film (stretched film) can be used.By making
By the use of quarter wave plate as the transparent protective film 13 of 50 side of image-display units of polarizer 11, polarization plates 10 is made to become circularly polarizing plate,
The reduction of visibility caused by can inhibiting the reflection of the extraneous light because being incident on image-display units.By using
Transparent protective film 12 of the quarter wave plate as the visuognosis side for being arranged on polarizer 11, makes to distinguish from image display device to vision
Recognize side outgoing light become rotatory polarization, even for for the viewer with polarized sunglasses also can visuognosis to suitably
Image show.
The moisture permeability for being arranged on the transparent protective film 12 of the visuognosis side of polarizer 11 is preferably 300g/m224 hours
More than, more preferably 500g/m224 hours or more, further preferably 700g/m224 hours or more.In transparent protective film
In the case of 12 moisture permeability height, delay of the moisture in polarization plates 10 can be inhibited, can be inhibited by forming the poly- of polarizer
The reduction of the polyenic caused transmissivity of vinyl alcohol.
For example, by using material of the cellulosic resin as transparent protective film 12, moisture permeability can be adjusted supreme
State range.For cellulosic resin, the ester of such as cellulose and aliphatic acid can be enumerated.As the specific of cellulose esters
For example, the cellulose ethanoates such as triacetyl cellulose, diacetyl cellulose, cellulose propionate, cellulose fourth can be enumerated
Acid esters etc..
Can be added on the surface of polarization plates 10 hard conating, antireflection layer (reflection prevents Layer), adherent layer, antistatic backing,
The functional coatings such as easy adhesive layer.But from the viewpoint of high moisture-inhibiting degree is kept, it is arranged on the visuognosis side of polarizer 11
Transparent protective film 12 be preferably not provided with hard conating, antireflection layer etc. make moisture permeability reduce functional coating.
(cell side bonding sheet)
In image display panel 60, image-display units 50 are bonded with polarization plates 10 preferably via bonding sheet 30.Image
Preferably 3 μm~30 μm of the thickness of cell side bonding sheet 30 used in being bonded of display unit and polarization plates.As Component units
, it is preferable to use acrylic adhesives for the adhesive of side bonding sheet.
For cell side bonding sheet 30, the store elastic modulus G ' at preferably 25 DEG C25It is 1 × 104Pa~1 ×
107Pa, more preferably 5 × 104Pa~5.0 × 106Pa, further preferably 1 × 105Pa~1 × 106Pa.If cell side is glued
Close the G ' of piece25Within the above range, then it shows appropriate adhesivity, and can inhibit by bonding sheet or with the inclined of adhesive
Adhesive is to the transfer of cutting blade etc. and rupture, the defect of adhesive etc. when vibration plate cuts into predetermined size.
(the other components for forming image display panel)
It, can be also other than bonding sheet 30 between image-display units 50 and polarization plates 10 in image display panel 60
Expand the optical elements such as film comprising optical compensation films, visual angle.Can the back side of image-display units 50 be configured with backlight,
The optical elements such as back side polarization plates, brightness enhancement film.
[front transparent component]
For front transparent component 70, front transparent plate (window layer), touch panel etc. can be enumerated.Front transparent structure
Part 70 includes transparent resin plate 71 in image display panel side surface, and transparent resin plate 71 is contacted with the second bonding sheet 22.
In the case where front transparent component 70 is front transparent plate, as the resin material for forming transparent resin plate 71
Speech, preferably acrylic resin, polycarbonate resin etc..From the viewpoint of the transparency and mechanical strength is taken into account, it can incite somebody to action
Multiple transparent resin board stackings comprising different resins material use.For example, by using acrylic acid resin plate and poly- carbonic acid
The laminated resin plate of esters resin plate can utilize polycarbonate resin while the transparency for maintaining acrylic resin
Improve the mechanical strength of transparent panel.
The thickness of transparent resin plate 71 is preferably 500 μm or more, more preferably 700 μm or more, further preferably 800 μm
More than.By increasing the thickness of transparent resin plate 71, even if 100 DEG C or more of hot environment is exposed in image display device
In the case of, do not allow to be also easy to produce warpage yet, stripping of the front transparent component from image display panel can be inhibited.From inhibiting by temperature
From the perspective of warpage caused by variation, the thickness of transparent resin plate 71 the big the more preferred.On the other hand, when thickness is excessive, have
When the transparency reduce, therefore the thickness of transparent resin plate 71 is preferably 5mm hereinafter, more preferably 4mm is hereinafter, further preferably
Below 3mm.
Painting for assigning the functions such as antireflective, scratch resistance, soil resistance can be set on the surface of transparent resin plate 71
Layer.In the peripheral part with the binding face of bonding sheet 22 of transparent resin plate 71, it is usually provided with for the purpose of decorating or shield light
Printing layer 76.The thickness of printing layer 76 is, for example, about 5 μm~about 30 μm.
Front transparent component 70 can be the touch panel using transparent resin plate 71 as substrate.As touch panel
Speech can use any form of touch panels such as resistance membrane type, condenser type, optical profile type, ultrasonic type.In resistance membrane type or electricity
In the touch panel of appearance formula, the electrode for position detection can be provided on transparent resin plate.
[composition between image display panel and front transparent component]
In image display device 100, from image display panel between image display panel 60 and front transparent component 70
It rises with the first bonding sheet 21,25 and second bonding sheet 22 of transparent film base material 60 sides.Using the first bonding sheet 21, image is shown
The polarization plates 10 of panel 60 are bonded with transparent film base material 25, using the second bonding sheet 22, by transparent film base material 25 and front transparent
Component 70 is bonded.
(transparent film base material)
The transparent film base material 25 between two bonding sheets 21,22, which is configured, has the transparent tree made in front transparent component 70
Fat plate 71 is bonded stress equilibrium, the work so as to inhibit the warpage of transparent resin plate that interface generates with the second bonding sheet 22
With.Transparent film base material 25 also works as the moisture from polarization plates 10 to be made to be emitted to the passage of water outside system.For
There is the flexural rigidity that can aid in the warpage for inhibiting transparent resin plate and so that the film side is effectively risen as the passage of water
Effect, the thickness of transparent film base material 25 is preferably 10 μm or more, more preferably 20 μm or more.From the maintenance transparency and make moisture
It is dissipated from the interarea of film, from the viewpoint of delay of the inhibition moisture in polarization plates 10, the thickness of transparent film base material 25 is preferably
150 μm hereinafter, more preferably 100 μm hereinafter, further preferably less than 80 μm.
As for the material for forming transparent film base material 25, it is preferable to use the above-mentioned transparent protective film as polarizer
The various thermoplastic resin materials of material.In order to which transparent film base material 25 is made effectively to work as the passage of water, with being arranged on
The transparent protective film 12 of the visuognosis side of polarizer 11 is similary, the material preferred cellulose resinoid of transparent film base material 25.
(bonding sheet)
The first bonding sheet 21 being arranged between the polarization plates 10 of picture display face plate surface and transparent film base material 25 has
Make being bonded the stress relaxation of interface of transparent resin plate 71 together with transparent film base material 25 and inhibit the effect of warpage.It is arranged on
The second bonding sheet 22 between transparent film base material 25 and transparent resin plate 71 has outgassing of the confrontation from transparent resin plate 71
It releases stress, the effect so as to inhibit delay of the bubble at fitting interface.The periphery of front transparent component 70 is provided with printing
Layer 76 in the case of, the second bonding sheet 22 also have as inhibit delay of the bubble near the printing height difference of printing layer with
The effect of uneven buffer layer (height difference absorbed layer) is shown as caused by printing height difference.
In order to fight the outgassing from transparent resin plate, the second bonding sheet 22 needs have appropriate hardness at high temperature.
Specifically, the fitting part of the transparent resin plate 71 with front transparent component 70 in the second bonding sheet 22, at preferably 105 DEG C
Store elastic modulus G '105It is 3 × 104More than Pa, more preferably 5 × 104More than Pa, further preferably 6 × 104Pa with
On.
In this specification, store elastic modulus G ' by read according to JIS K7244-1 " plastics-dynamic mechanically characteristic
Method described in test method ", under conditions of frequency 1Hz in the range of -50 DEG C~150 DEG C with 5 DEG C/min of heating
Value when speed is measured, under set point of temperature and be obtained.
Second bonding sheet 22 can be laminate adhesive piece obtained from multiple adhesive phases are laminated.For example, it can pass through
Use G '105Adhesive for above range is as positioned at the adhesive phase with the fitting part of transparent resin plate 71 and transparent
25 side of film base material is laminated the adhesive phase of flexible relative and the second bonding sheet is made integrally to have resiliency.In the second bonding sheet by list
In the case that the adhesive phase of layer is formed, the preferably G ' of the second bonding sheet105For above range.The store elastic of second bonding sheet
When modulus is excessively high, it is uneven that display is generated due to the printing height difference of the peripheral part of front transparent component sometimes.Therefore, second is viscous
Close the store elastic modulus G ' at 105 DEG C of piece105Preferably 2 × 105Pa is hereinafter, more preferably 1 × 105Below Pa.
The bonding sheet of second bonding sheet 22 is less than as the first bonding sheet 21 by using the store elastic modulus under room temperature,
It can make the stress relaxation of the fitting interface of transparent resin plate 71, the end as caused by the warpage of transparent resin plate 71 can be inhibited
The stripping in portion.Specifically, the store elastic modulus G ' at 25 DEG C of the second bonding sheet 2225More than at 25 DEG C of the first bonding sheet
Store elastic modulus G '25.The G ' of second bonding sheet 2225It is preferred that the G ' than the first bonding sheet 2125It is big by 5 × 103More than Pa, more
It is it is preferred that big by 1 × 104More than Pa.
In the image display device of the present invention, front transparent plate includes resin material, therefore can inhibit moisture inclined
Delay in vibration plate 10, transmissivity caused by the modification (polyenic etc.) of polyvinyl alcohol by forming polarizer 11 can be inhibited
It reduces.On the other hand, compared with the transparent panel of glass system, the rigidity of the transparent panel of resin is small, and change in size during heating is big,
Therefore warpage is easily generated.When particularly restoring from heating environment to room temperature, generated along with temperature change in fitting interface
Stress, and the elasticity modulus of transparent resin plate increases, therefore warpage is easily generated on transparent resin plate.In addition, use as
The plywood of acrylic resin and polycarbonate resin layer is obtained in this way by the resin layer stackup comprising different materials
Laminated resin plate as transparent resin plate in the case of, the size of the resin layer at the surface as caused by temperature change and the back side becomes
Change amount is different, therefore easily generates warpage.When warpage is generated on transparent resin plate, sometimes in peripheral part (end face) transparent resin plate
It is removed from bonding sheet.
In the image display device of the present invention, due to second bonding sheet 22 and the fitting part of transparent resin plate 71
Store elastic modulus is big, therefore can fight the outgassing from transparent resin plate 71 under heating environment and release stress to press down
Bubble processed is in the delay at fitting interface.In addition, since the store elastic modulus of the second bonding sheet 22 is relatively high, from adding
When thermal environment is restored to room temperature (near 25 DEG C), that offsets 71 and second bonding sheet 22 of transparent resin plate is bonded answering for interface
Power can inhibit the warpage of transparent resin plate.Further, since it is provided with hyaline membrane between the second bonding sheet 22 and polarization plates 10
Base material 25 and relatively low the first bonding sheet 21 of store elastic modulus, therefore can absorb/dissipate transparent resin plate 71 and
The stress of the fitting interface of two bonding sheets 22 is so as to inhibit warpage.
As described above, in the image display device of the present invention, by using resin material, energy in front transparent component
Enough inhibit the deterioration of the polarization plates under hot environment.About the outgassing as caused by resin material and warpage, can by using
The laminate adhesive piece 20 with base material with transparent film base material 25 between two layers of bonding sheet 21,22 with defined viscous-elastic behaviour
Polarization plates 10 are bonded to solve with transparent resin plate 71.
In order to prevent when bonding sheet or polarization plates with adhesive are cut into predetermined size adhesive in cutting blade
Attachment on and initial adhesion characteristic when ensuring fitting, the G ' of the first bonding sheet 2125Preferably 1 × 104Pa~2 ×
105Pa, more preferably 5 × 104Pa~1.5 × 105Pa.As described above, the G ' of the second bonding sheet 2225Preferably greater than first bonding
The G ' of piece 2125And it is 1 × 104More than Pa.The G ' of second bonding sheet 2225Preferably 3 × 104Pa~8 × 105Pa, more preferably
5×104Pa~5 × 105Pa, further preferably 7 × 104Pa~3 × 105Pa。
From the reality inhibited in heating when being bonded of the second bonding sheet 22 and front transparent component 70 or image display device
The bonding sheet under heating environment when border uses is from the viewpoint of the protrusion of end face, the first bonding sheet 21 and the second bonding sheet 22
Store elastic modulus G ' at respective 105 DEG C105Preferably 5 × 103Pa~2 × 105Pa, more preferably 8 × 103Pa~1.5
×105Pa。
In order to which there is the height difference absorbability to printing height difference, the thickness of the second bonding sheet 22 by the effect as buffer layer
Spend d2Preferably 50 μm or more, more preferably 70 μm or more, further preferably 80 μm or more.The thickness of second bonding sheet 22
The upper limit is not particularly limited, and productivity from bonding sheet is prevented from the viewpoints such as protruding from end face and considered, preferably less than 500 μm.
In the case of laminates of second bonding sheet for multiple adhesive phases, from the resistance to the outgassing from transparent resin plate 71 and
From the viewpoint of inhibiting warpage, the thickness of the adhesive phase set in a manner of being contacted with transparent resin plate 71 be preferably 5 μm with
On, more preferably 10 μm or more, further preferably 15 μm or more.
The thickness d of first bonding sheet 211Preferably 3 μm~50 μm, more preferably 5 μm~40 μm, further preferably 10 μ
M~30 μm.The thickness of first bonding sheet 21 is preferably smaller than the thickness of the second bonding sheet 22.The thickness d of first bonding sheet 211With
The thickness d of two bonding sheets 222The ratio between d1/d2Preferably 0.5 hereinafter, more preferably 0.3 hereinafter, further preferably less than 0.2.
(composition of adhesive)
For the first bonding sheet 21 and the second bonding sheet 22, as long as with above-mentioned each characteristic, then the composition of adhesive
It is not particularly limited, can suitably select use with acrylic polymer, polysiloxane type polymers, polyester, polyurethane, gather
Amide, polyvingl ether, vinyl acetate/vinyl chloride copolymer, improved polyalkene, epoxies, fluorine-containing type, natural rubber, conjunction
Adhesive into polymer such as the rubbers such as rubber as basic polymer.
For the adhesive excellent as optical transparence and adhesivity, it is preferable to use using acrylic polymer as base
The acrylic adhesives of plinth polymer.In acrylic adhesives, preferably acrylic compounds base polymer is relative to adhesive
The content of the solid constituent total amount of composition is more than 50 weight %, more preferably more than 70 weight %, further preferably 80
More than weight %.
As for acrylic polymer, it is preferable to use using the monomeric unit of (methyl) alkyl acrylate as main
The acrylic polymer of skeleton.It should be noted that in this specification, " (methyl) acrylic acid " refers to acrylic acid and/or first
Base acrylic acid.As for (methyl) alkyl acrylate, it is preferable to use the carbon atom number of alkyl be 1~20 (methyl) propylene
Acid alkyl ester.
The alkyl of (methyl) alkyl acrylate can have branch.For (methyl) acrylic acid branched alkyl ester,
It is preferable to use (methyl) 2-EHA, (methyl) Isooctyl acrylate monomer, the different nonyl ester of (methyl) acrylic acid, (methyl) third
Olefin(e) acid isodecyl ester, the different tetradecane base ester of (methyl) acrylic acid, (methyl) acrylic acid isooctadecane base ester etc..
Relative to the monomer component total amount of formation base polymer, (methyl) acrylic acid in acrylic compounds base polymer
The content of Arrcostab is preferably more than 40 weight % more preferably more than 50 weight %, further preferably more than 60 weight %.
Acrylic compounds base polymer can be the copolymer of a variety of (methyl) alkyl acrylates, or (methyl) acrylic acid is straight
Alkane base ester and the copolymer of (methyl) acrylic acid branched alkyl ester.The arrangement of composition monomeric unit in copolymer can be nothing
Rule, or block.
Acrylic polymer can include polyfunctional monomer ingredient as composition monomer component.By with multifunctional list
Body has the tendency for the store elastic modulus for improving adhesive as comonomer components.By changing polyfunctional monomer ingredient
Type, content, the store elastic modulus of the first bonding sheet and the second bonding sheet can be adjusted to desired range.More officials
Energy monomer is the list with the polymerizable functional group with unsaturated double-bond such as at least two (methyl) acryloyl group or vinyl
Body.
In order to adjust the molecular weight of polymer, chain-transferring agent can be used.Chain-transferring agent has the polymer chain from growth
Receive free radical and the extension of polymer is made to stop and receive the chain-transferring agent monomer attack monomers of free radical and draw again
Send out the effect of polymerization.By using chain-transferring agent, can inhibit in the case of the number of free radical in not reducing reaction system
The increase of molecular weight has the tendency that the store elastic modulus of bonding sheet becomes smaller.As for chain-transferring agent, it is preferable to use for example
α-thioglycerol, lauryl mercaptan, glycidyl mercaptan, thioacetic acid, 2 mercapto ethanol, thioglycolic acid, thioglycolic
The thio-alcohols such as sour 2- ethylhexyls, 2,3- dimercapto -1- propyl alcohol.
Acrylic compounds base polymer can contain the acrylic monomer units with crosslinkable functional group as altogether
It is polymerized to point.In the case where base polymer has crosslinkable functional group, it can be irradiated by ultraviolet light and easily be consolidated
Change.For the acrylic monomer with crosslinkable functional group, hydroxyl monomer, carboxyl group-containing monomer can be enumerated.Its
In, the adhesive for forming the second bonding sheet preferably comprises copolymer composition of the hydroxyl monomer as basic polymer.It is poly- on basis
In the case of conjunction object has hydroxyl monomer as monomeric unit, there is the bridging property for improving base polymer and inhibit high temperature
The tendency of the gonorrhoea of adhesive under high humidity environment can obtain the high adhesive of the transparency.
In the adhesive for forming the second bonding sheet 22, preferably base polymer is in addition to above-mentioned (methyl) alkyl acrylate
With hydroxyl monomeric unit in addition also containing the high monomeric unit of nitrogen containing monomer isopolarity.By in addition to hydroxyl monomeric unit
Also containing high polar monomer units such as nitrogen containing monomer units, with higher adhesivity and retentivity and press down with adhesive
The tendency of gonorrhoea under preparing high-temp high humidity environment.
Acrylic compounds base polymer can pass through polymerisation in solution, UV (ultraviolet light) polymerization, bulk polymerization, emulsion polymerization etc.
It is prepared by well known polymerization.The consideration of the viewpoints such as the transparency, water resistance, cost from adhesive, preferably solution polymerization process or work
Performance amount ray polymerization method (such as UV polymerizations).For the solvent of polymerisation in solution, usually using ethyl acetate, toluene etc..
Can into the base polymer of ultraviolet-curing adhesive introducing crosslinked structure.By introducing crosslinked structure,
Store elastic modulus bigger tendency with bonding sheet.The formation of cross-linked structure is for example by after the polymerization of base polymer
Addition crosslinking agent simultaneously heats to carry out.For crosslinking agent, can use isocyanates crosslinking agent, epoxies crosslinking agent,Oxazolines crosslinking agent, aziridines crosslinking agent, carbodiimide class crosslinking agent, metal-chelating species crosslinking agent etc. are usually used
Crosslinking agent.In addition, by will there is the functional group that can be bonded with the functional group of base polymer and free redical polymerization function
The polymerizable compound of group is mixed with base polymer, and free redical polymerization function can be introduced in base polymer
Group.For the functional group that can be bonded with the functional group of base polymer, preferred isocyanate base.Isocyanate group and base
The hydroxyl of plinth polymer forms ammonia ester bond, therefore can easily carry out drawing for free redical polymerization functional group in base polymer
Enter.
For the purpose for adjusting adhesive tension, silane coupling agent, tackifier can be contained in adhesive composition.In addition,
Plasticizer, softening agent, degradation inhibitor, filler, colorant, antioxidant, surface can be contained in adhesive composition
The additives such as activating agent, antistatic agent.
The adhesive for forming the first bonding sheet 21 and/or the second bonding sheet 22 can be the viscous of light-cured type or thermohardening type
Mixture.If using the adhesive of the curing type comprising unpolymerized ingredient as the second bonding sheet 22, with front transparent plate
During 71 fitting, since store elastic modulus is small, mobility is high, adhesive is easily accessible near height difference, can be inhibited in height difference
Neighbouring bubble is mixed into.If cured after fitting, store elastic modulus increase, therefore the second bonding sheet can be made
22 have the function of as described above to the resistance of outgassing and inhibition warpage.
After being bonded with front transparent component easily it is cured from the aspect of, curing adhesive is preferably light-cured type.
For the method for photocuring, preferably to system irradiation ultraviolet light containing photocurable compound and Photoepolymerizationinitiater initiater etc.
The method of active ray., it is preferable to use olefinic insatiable hunger particularly from the aspect of light sensitivity is high, selectable material enriches
With compound and the system of optical free radical propellant.
In the case where the adhesive of the second bonding sheet 22 is light-cured type, relative to whole 100 weights of adhesive composition
Measure part, the content of photocurable compound is preferably the parts by weight of 0.01 parts by weight~50, the weight of more preferably 0.05 parts by weight~30
Measure part.In order to which the store elastic modulus of the adhesive after curing is adjusted to proper range, relative to adhesive composition entirety
100 parts by weight, the content of the polyfunctional monomer of the photo-curable in adhesive composition are preferably 5 parts by weight hereinafter, more preferably
For 3 parts by weight hereinafter, below further preferably 2 parts by weight.
Adhesive composition for example can be by being applied on base material and as needed obtaining solvent seasoning by bonding sheet
It arrives.For base material, transparent film base material 25 can be used, other base materials can also be used.It, can be with for coating method
Enumerate roller coating, roller licks coating, intaglio plate coating, reversely coating, roller brush, spraying, dip roll are coated with, scrape rod coating, blade coating, gas
Cutter painting cloth, curtain coating, lip coating, using the progress such as die coating machine extrusion coating methods the methods of.Among these, preferably
Using die coating machine, particularly more preferably using the die coating machine using spray coventry type die head coventry, slit coventry type die head coventry.
In the case where the base polymer of adhesive composition is polymerisation in solution polymer, preferably carry out after coating molten
The drying of agent.It, can be according to purpose suitably using suitable method for drying means.Heat drying temperature is preferably 40
DEG C~200 DEG C, more preferably 50 DEG C~180 DEG C, further preferably 70 DEG C~170 DEG C.Drying time may be appropriately used suitable
The time of conjunction.Drying time is preferably 5 seconds~20 minutes, more preferably 5 seconds~15 minutes, further preferably 10 seconds~10 points
Clock.
In the case where adhesive composition contains crosslinking agent, can be handed over after being applied on base material by heating
Connection.Heating temperature and heating time can suitably set according to the type of used crosslinking agent, usually at 20 DEG C~160 DEG C
In the range of be crosslinked by the heating of about 1 minute to about 7 days.For making the heating that the adhesive after coating is dried can also be simultaneous
Act on crosslinked heating.
Paste screening glass in a releasable manner on bonding sheet as needed.Screening glass is to be used for by adhesive
The exposed surface of adhesive is protected during before being bonded with adherend and is used.It can be by the formation of adhesive phase
The base material used when (coating) is directly used as the screening glass of adhesive phase.
[formation of image display device]
On the surface of image-display units 50, polarization plates 10 are bonded via cell side bonding sheet 30, by polarization plates 10 and just
Face transparent component 70 by between them across transparent film base material 25 in a manner of utilize the first bonding sheet 21 and the second bonding sheet 22
Fitting, thus obtains image display device.
The sequence of fitting is not particularly limited.If as shown in Fig. 2, it is provided with list using on a face of polarization plates 10
First side bonding sheet 30, the double-sides belt for being provided with the first bonding sheet 21,25 and second bonding sheet of transparent film base material on the other surface
The polarization plates of adhesive, then after polarization plates are fitted to the surface of image-display units, it is convenient to omit set up in polarization plates
The process of other bonding sheet can simplify the manufacturing process of image display device.
Set the first bonding sheet 21, the method for 25 and second bonding sheet 22 of transparent film base material not special in polarization plates 10
Limitation.As shown in figure 3, it is provided with the first bonding sheet 21, another it is preferred that being previously formed on a face of transparent film base material 25
The laminate adhesive piece 20 with base material of the second bonding sheet 22 is provided on a face, and the laminate adhesive piece 20 with base material is bonded
Onto polarization plates 10.
In the laminate adhesive piece 20 with base material, preferably bonded as shown in Figure 3 on the surface of the first bonding sheet 21 and second
Screening glass 41,42 is temporarily posted respectively in the surface of piece 22.By the way that the screening glass 41 for being arranged on the surface of the first bonding sheet 21 is shelled
It is bonded from and with polarization plates 10, can obtain being provided with the first bonding sheet 21, transparent film base material 25 and second in polarization plates 10
Bonding sheet 22 and the polarization plates with adhesive that screening glass 42 is temporarily posted on the surface of the second bonding sheet 22.Double-sides belt is glued
In the polarization plates of mixture, as shown in Fig. 2, it is preferred that temporarily posting screening glass 43 on the surface of cell side bonding sheet.
As for the constituent material of the screening glass 41,42,43 on the surface for being temporarily attached to bonding sheet, it is preferable to use poly- second
The plastic foil of alkene, polypropylene, polyethylene terephthalate etc..The thickness of screening glass is typically about 5 μm~about 200 μm, excellent
It is selected as about 10 μm~about 150 μm.Pass through the binding face (Fu Let faces with bonding sheet to screening glass) on suitably carry out polysiloxanes
The lift-off processings such as processing, chain alkyl processing, fluorine processing, can improve the fissility from adhesive.
In the case of the polarization plates for using double-sides belt adhesive shown in Fig. 2, the sequence of fitting is not particularly limited.It can
First to carry out the fitting of 50 side of image-display units, the fitting of 70 side of front transparent component can also be first carried out.Alternatively, it is also possible to
It is carried out at the same time the fitting of the two.From the viewpoint of the workability being bonded, the axis precision of polarization plates is improved, it is preferred that will protect
Then bluff piece 43 is carried out polarization plates 10 and image-display units via bonding sheet 30 from the sur-face peeling of cell side bonding sheet 30
Then the cell side bonding process of 50 fittings, by screening glass 42 from the sur-face peeling of the second bonding sheet 22, is carried out via band base material
The visuognosis side bonding process that is bonded polarization plates 10 with front transparent component 70 of laminate adhesive piece 20.
After being bonded of polarization plates 10 and front transparent component 70, preferably carry out for the second bonding sheet 22 and front is saturating
The deaeration that bubble near the non-flat forms portions such as the interface of bright component 70, the printing layer 76 of front transparent component 70 removes.As de-
For bubble method, the appropriate method such as heating, pressurization, decompression may be used.For example, it is preferable to：Inhibit bubble under decompression, heating
It is mixed to be carried out at the same time fitting, then, in order to inhibit delay blistering etc., added while heating by autoclave process etc.
Pressure.In the case where bonding sheet is light-cured type or thermohardening type, preferably carry out with front transparent component be bonded and heating
By adhesive curing after processing.
Embodiment
Being exemplified below embodiment and comparative example, the present invention will be described in more detail, but the present invention is not restricted to these implements
Example.
[preparation of adhesive composition]
<Adhesive A>
2-EHA (2EHA) is put into reaction vessel：65 parts by weight, n-vinyl pyrrolidone
(NVP)：15 parts by weight, Hydroxyethyl Acrylate (HEA)：20 parts by weight and the 1- hydroxy-cyclohexyl benzene as Photoepolymerizationinitiater initiater
Base ketone (" IRGACURE184 " of BASF manufactures)：0.1 parts by weight, irradiate ultraviolet light in a nitrogen atmosphere, have obtained aggregate rate
10% prepolymer composite.2,2- diformazan of the addition as Photoepolymerizationinitiater initiater into 100 parts by weight of prepolymer composite
Oxy-1,2- diphenylethane -1- ketone (" IRGACURE651 " of BASF manufactures；IRG651)：0.2 parts by weight, as multifunctional
The 1,6 hexanediol diacrylate (" the NK ester A-HD-N " of the manufacture of Xin Zhong villages chemical industry) of monomer：0.3 parts by weight and
3- glycidoxypropyltrime,hoxysilanes (" KBM-403 " of SHIN-ETSU HANTOTAI's chemistry manufacture) as silane coupling agent：0.3 weight
Part, it is uniformly mixed, so as to be prepared for adhesive composition A.
<Adhesive B>
The additive amount of polyfunctional monomer in adhesive composition is changed to 0.09 parts by weight.In addition to this, with gluing
The same mode for preparing of mixture composite A is prepared for adhesive composition B.
<Adhesive C>
0.2 parts by weight α-thioglycerol (TGR) is added to as chain-transferring agent.In addition to this, with adhesive composition B
The same mode for preparing be prepared for adhesive composition C.
<Adhesive D>
The composition of the monomer that feeds intake in the preparation of prepolymer composite is changed to 2HEA：55 parts by weight, NVP：25 weight
Part and HEA：The additive amount of polyfunctional monomer in adhesive composition is changed to 0.7 parts by weight by 20 parts by weight.Except this with
Outside, by with adhesive composition A prepare it is same in a manner of be prepared for adhesive composition D.
<Adhesive E>
The composition of the monomer that feeds intake in the preparation of prepolymer composite is changed to butyl acrylate (BA)：57 parts by weight,
Cyclohexyl acrylate (CHA)：12 parts by weight, HEA：8 parts by weight and acrylic acid 4- hydroxybutyls (4HBA)：23 parts by weight will add
The polyfunctional monomer being added in adhesive composition is changed to dipentaerythritol hexaacrylate, and (Japanese chemical drug manufactures
“KAYARAD DPHA”)：0.12 parts by weight.In addition to this, by with adhesive composition A prepare it is same in a manner of be prepared for gluing
Mixture composite E.
<Adhesive F>
It will be as the BA of monomer component：95 parts by weight, acrylic acid (AA)：4.9 parts by weight and HEA：0.1 parts by weight and
Azodiisobutyronitrile (AIBN) as thermal polymerization：0.2 parts by weight put into reaction together with 233 parts by weight of ethyl acetate
In container, stirred 1 hour under 23 DEG C of nitrogen atmosphere, carried out nitrogen displacement.Then, it reacts 5 hours, obtains at 60 DEG C
Acrylic compounds base polymers.Three as isocyanates crosslinking agent are added into the acrylic compounds base polymer solution
Hydroxymethyl-propane toluene di-isocyanate(TDI) (" the Coronate L " of Japanese polyurethane industry manufacture)：0.6 parts by weight and as silicon
The KBM-403 of alkane coupling agent：0.3 parts by weight, are then uniformly mixed, and are prepared for adhesive composition F (solution).
<Adhesive G (cell side adhesive)>
Monomer composition is changed to BA：97 parts by weight and AA：3 parts by weight, the crosslinking being added in adhesive composition
Agent (Coronate L) is changed to 0.8 parts by weight, and silane coupling agent (KBM-403) is changed to 0.1 parts by weight, in addition to this,
By with above-mentioned adhesive F prepare it is same in a manner of be prepared for adhesive composition G (solution).
[making of monolayer adhesive piece]
<Bonding sheet A~E>
By above-mentioned adhesive composition A be coated on partition (single side with polysiloxanes carried out demoulding processing polyester film)
Demoulding process face so that thickness be 250 μm, so as to form coating layer, the demoulding of another partition is bonded on the coating layer
Process face.Then, utilization is so that the exposure intensity of the shadow surface of lamp directly below is 5mW/cm2Mode carried out position tune
The black light lamp of section carries out UV irradiations, until accumulated light reaches 3000mJ/cm2, polymerization is carried out, it is temporary on two sides so as to obtain
When post the bonding sheet A1 of partition.
Other than coating thickness is changed to 20 μm, bonding sheet A2 has been obtained in the same manner as above.Become more tacky
The type and thickness of mixture composite have made the bonding sheet B1 (250 μm of thickness) using adhesive composition B, using bonding
The bonding sheet C1 (250 μm of thickness) and bonding sheet C2 (20 μm of thickness) of agent composition C, the bonding sheet of adhesive composition D is used
D1 (250 μm of thickness) and bonding sheet E1 (250 μm of thickness), the bonding sheet E2 (100 μm of thickness) using adhesive composition E
With bonding sheet E3 (500 μm of thickness).
<Bonding sheet F>
Above-mentioned adhesive composition F is applied in the demoulding process face of partition so that dried thickness be 250 μm,
It is heated at 100 DEG C and eliminates solvent.Then, it is heated 48 hours at 50 DEG C, carries out crosslinking Treatment, obtained 250 μ of thickness
The bonding sheet F1 of m.
<The measure of store elastic modulus>
For adhesive composition A~F each, make the monolayer adhesive piece of 250 μm of thickness, multiple bonding sheets are laminated and
The bonding sheet of thickness about 1.5mm is made, as measurement sample.It is manufactured using Rheometric Scientific " first
Into Rheometric Expansion System (Advanced Rheometric Expansion System) (ARES) ", provide following condition into
Mobile state determination of viscoelasticity has read the store elastic modulus (G ' at 25 DEG C, 50 DEG C and 105 DEG C by measurement result25、G’50With
G’105)。
(determination condition)
Deformation pattern：Torsion
Measurinng frequency：1Hz
Heating rate：5 DEG C/min
Measuring temperature：- 50 DEG C~150 DEG C of range
Shape：Parallel-plate
The measurement result of the composition of adhesive composition A~F and the store elastic modulus of respective bonding sheet is arranged and is represented
In table 1.
Table 1
[making of the polarization plates of one-side band adhesive]
Above-mentioned adhesive composition G is applied in the demoulding process face of partition so that dried thickness be 20 μm,
It is heated at 100 DEG C and eliminates solvent.Then, it is heated 48 hours at 50 DEG C, crosslinking Treatment is carried out, so as to obtain unit
Side bonding sheet.
Used has thickness in a face of the polarizer of the stretching polyethylene alcohol film comprising 25 μm of thickness for being impregnated with iodine
Triacetyl cellulose (TAC) transparent protective film of 40 μm of degree simultaneously has the transparent guarantor of acrylic compounds of 30 μm of thickness in another face
The polarization plates of cuticula.Using roller laminator in acrylic compounds protective film side surface (unit side surface) fitting of the polarization plates
The cell side bonding sheet stated, so as to obtain the polarization plates that there is bonding sheet in a face of polarization plates.
[embodiment 1]
<The making of laminate adhesive piece with base material>
The hard conating forming face fitting in single side with triacetyl cellulose (TAC) film of 40 μm of the thickness of hard conating is above-mentioned
Bonding sheet A1, and the bonding sheet F1 stated is closed in another face paste, there is TAC bases between two layers of bonding sheet so as to make
The laminate adhesive piece with base material of material film.
<The making of the polarization plates of double-sides belt adhesive>
By the surface (TAC transparent protective films side surface) for not setting up bonding sheet of the polarization plates of above-mentioned one-side band adhesive
It is bonded with the bonding sheet F1 side surfaces of the above-mentioned laminate adhesive piece with base material, so as to obtain the polarization of double-sides belt adhesive
Plate.
<The making of evaluation panel>
The polarization plates of above-mentioned double-sides belt adhesive are cut into the size of 200mm × 140mm, then stripping unit side is glued
The partition of on piece is closed, cell side bonding sheet surface is overlapped onto to the central portion of the glass plate of 0.7mm thickness, and carry out using hand roller
Fitting.
Then, the partition of the visuognosis side surface of the polarization plates of stripping double-sides belt adhesive, will be in peripheral part with frame-shaped
The printing surface for being printed with the transparent resin plate of black ink is placed in the exposed surface of adhesive (on bonding sheet A1), and using very
Empty thermo-compression bonding device is bonded (pressure 50Pa in 25 DEG C of temperature, device, pressure 0.3MPa, pressure hold time 10 seconds).
Then, autoclave process (50 DEG C, 0.5MPa, 15 minutes) is carried out, has obtained evaluation panel.Transparent resin plate is poly- methyl-prop
The laminating transparent resin plate (1mm thickness × 200mm × 140mm) of e pioic acid methyl ester (PMMA) and makrolon (PC), in PC side surfaces
It is upper with black ink printing surface (ink print thickness=10 μm, two short sides (long side direction) ink printing width：Respectively
The ink printing width of 15mm, two long sides (short side direction)：Each 5mm).
[embodiment 2~6 and comparative example 1~3]
The composition of the laminate adhesive piece of ground as shown in table 2 change tape base material.In addition to this, by similarly to Example 1
Step system is evaluated with analog image display device.
[embodiment 7]
In addition to using the front transparent plate (the laminating transparent resin plate of PMMA and PC) of thickness 0.7mm as front transparent plate
In addition, it is evaluated by the step of system similarly to Example 3 and uses panel.
[embodiment 8,9]
Other than using the transparent resin plate of thickness 2mm as front transparent plate, by similarly to Example 1 the step of
System, which is evaluated, uses panel.In embodiment 8, using the laminating transparent resin plate of PMMA and PC as front transparent plate.In reality
It applies in example 9, using the laminating transparent resin plate comprising tri- layers of PMMA/PC/PMMA as front transparent plate.
[comparative example 4]
In the making of the polarization plates of double-sides belt adhesive, laminate adhesive piece is replaced as polarization plates using bonding sheet A1 individual layers
Visuognosis side bonding sheet.In addition to this, it is evaluated by the step of system similarly to Example 1 and uses panel.
[comparative example 5]
Other than using the glass plate of thickness 0.7mm as front transparent plate, by with 4 similary step system of comparative example
It is evaluated and uses panel.
[comparative example 6]
Other than using the glass plate of thickness 0.7mm as front transparent plate, pass through the step of system similarly to Example 3
It is evaluated and uses panel.
[evaluation]
<Bubble>
The inside of the black ink printing layer of evaluation panel is nearby seen using 20 times of digital microscope of multiplying power
It examines, it is thus identified that have bubble-free in bonding sheet.To not confirm bubble, person is denoted as "available", will confirm that bubble person is denoted as " can not ".
<Heat run>
To the single plate transmission (Unit Ti transmittances of central portion in the face of evaluation panel) it (is regarded using 2 degree of JlS Z8701
Field (illuminant-C) has carried out the Y value of visual acuity correction) it is measured.Evaluation after measure single plate transmission is put into panel
It in the hot-air oven that 105 DEG C of temperature, is taken out after 500 hours, cooled to room temperature, then implements following evaluations.
(transmissivity variation)
The single plate transmission of central portion in the face of evaluation panel is measured, is calculated relative to before heat run
The change rate of single plate transmission.
(adhesive stripping)
The side of the long side direction of evaluation panel is observed, it is thus identified that whether there is glass plate and front transparent in end
The stripping of plate.For confirming stripping person, the overburden amount (distance away from end) started from end is determined.Stripping will not confirmed
It is 0 to be denoted as overburden amount from person.
(bubble in face)
The appearance of central portion carries out visual confirmation in face from front transparent plate side to evaluation panel, utilizes digital micro-analysis
Mirror observes the part for confirming bubble.By the person that do not confirm bubble and the bubble confirmed using foreign matter as core or
Diameter is denoted as "available" less than 300 μm of persons, will confirm that the bubble person not using foreign matter as 300 μm of the diameter of core or more is denoted as " no
Can ".
[evaluation result]
By the stacking with base material used in being bonded of polarization plates in the various embodiments described above and comparative example and front transparent plate
Composition (wherein, bonding sheet of the comparative example 4,5 for individual layer), the thickness of each bonding sheet (individual layer) and the store elastic mould of bonding sheet
Amount, the material of front transparent plate and thickness and evaluation result is shown in table 2.
Glass plate is being used to retrodeviate vibration plate as in the comparative example 5 of front transparent plate in heat run and change colour, and
The transmissivity of central portion is greatly reduced in panel.In comparative example 4, the reduction of the transmissivity after heat run is not observed,
But warpage is generated on resin plate, and peeling-off at the interface of panel end resin plate and adhesive.
It is glued in polarization plates with the stacking with base material for having used and there is bonding sheet on the two sides of base material film that is bonded of resin plate
In the Examples 1 to 9 and comparative example 1~3 of closing piece, the reduction of the transmissivity after heat run is not observed, also inhibits resin
Plate is in the stripping of panel end.In the comparative example 6 for being bonded polarization plates with glass plate using the laminate adhesive piece with base material, with
Comparative example 5 similarly confirms the reduction of the transmissivity as caused by the discoloration of polarization plates after heat run.
From the above results, by using transparent resin plate as front transparent plate, even if in 100 DEG C or more of heating
It can also inhibit the deterioration as caused by the polyenic grade of polarization plates after experiment.It is found that in the case where using transparent resin plate, though
The stripping as caused by the warpage of transparent resin plate is so generated sometimes, but by using the laminate adhesive piece with base material, can be pressed down
Warpage processed.
When the embodiment 1 for having used identical laminate adhesive piece and embodiment 8 and embodiment 9 are compared, in resin
In the larger embodiment 8,9 of the thickness of plate, the overburden amount as caused by warpage reduces.In addition, in the ratio of embodiment 3 and embodiment 7
Also same tendency is observed in relatively.As knowen from these results, it by increasing the thickness of resin plate, can reduce by temperature change
Caused warpage.
Store elastic modulus G ' in the case where using 25 DEG C25Larger bonding sheet A2 as be arranged on polarization plates and film base material it
Between the first bonding sheet (bonding sheet 1) comparative example 3 in, compared with comparative example 4, remove and subtract as caused by the warpage of resin plate
It is small, but compared with Examples 1 to 6, overburden amount increase.Examples 1 to 6 and comparative example 3 have used identical resin plate, thus may be used
Know, the overburden amount of the resin plate as caused by warpage can generate difference according to the difference of the type of bonding sheet.
Specifically, diverse embodiment 3 identical by the type of the second bonding sheet and the first bonding sheet is compared with
The comparison of example 3 it is found that the first bonding sheet G '25In the case of smaller, make stress relaxation, the stripping as caused by warpage can be inhibited
From.In addition, the comparison of diverse embodiment 1 identical by the type of the first bonding sheet and the second bonding sheet and embodiment 2
It is found that in the G ' of the second bonding sheet25In the case of larger, the stripping as caused by warpage can be inhibited.By these results it can be said that
In the G ' of the second bonding sheet25More than the G ' of the first bonding sheet25In the case of, inhibit the effect removed as caused by warpage high.
The smaller bonding sheet C1 of store elastic modulus in the case where using high temperature, which is used as, to be arranged between resin plate and film base material
The second bonding sheet (bonding sheet 2) comparative example 1 in, confirm gas at the interface of bonding sheet and resin plate after heat run
Bubble.In the comparative example 6 that identical bonding sheet is used to be bonded glass plate, bubble is not confirmed, it is thus regarded that, in comparative example 3
In, the outgassing generated due to the heating of resin plate is trapped in the interface of resin plate and bonding sheet.In Examples 1 to 8, although making
With resin plate, but the delay of bubble is not confirmed.As knowen from these results, the store elastic at a high temperature of the second bonding sheet
In the case that modulus is big, can fight outgassing disengages pressure, can inhibit delay of the bubble at interface.On the other hand, than
Compared in example 2, the store elastic modulus of the second bonding sheet is excessive, therefore the height difference absorbability of bonding sheet is insufficient, in transparent resin
The printing height difference of plate nearby observes the delay of bubble.
In summary result is it is found that saturating as the front on the surface for being arranged on image-display units by using resin plate
Bright component can inhibit the reduction of the transmissivity as caused by the deterioration of polarization plates, by having via between two layers of bonding sheet
Polarization plates are bonded by the laminate adhesive piece with base material of transparent film base material with resin plate, can inhibit the resin plate as caused by warpage
Stripping.In addition we know, there is defined store elastic modulus by the bonding sheet for forming laminate adhesive piece, can further presses down
System stripping as caused by the warpage of resin plate, and delay of the outgassing from resin plate at fitting interface can be inhibited, and
It also is able to inhibit being mixed into for the bubble as caused by height difference absorbability near printing height difference.
Claims (5)
1. a kind of image display device, for will have on the surface of image-display units the image display panel of polarization plates with just
Image display device obtained from the transparent component integration of face, wherein,
Transparent film base material is fitted with via the first bonding sheet in the polarization plates of described image display panel, in the hyaline membrane base
The front transparent component is fitted with via the second bonding sheet on material,
The front transparent component includes transparent resin plate, and the transparent resin plate is contacted with second bonding sheet,
The thickness of second bonding sheet is 50 μm or more, and second bonding sheet is bonded with the front transparent component
Store elastic modulus at 105 DEG C of adhesive in part is 3 × 104More than Pa, and
Store elastic modulus at 25 DEG C of second bonding sheet is more than the store elastic at 25 DEG C of first bonding sheet
Modulus.
2. image display device as described in claim 1, wherein, the store elastic modulus at 25 DEG C of second bonding sheet
It is 1 × 104More than Pa.
3. image display device as described in claim 1, wherein, the store elastic mould at 105 DEG C of second bonding sheet
Measure is 2 × 105Below Pa.
4. image display device as described in claim 1, wherein, the thickness of first bonding sheet is 5 μm~50 μm.
5. such as image display device according to any one of claims 1 to 4, wherein, the thickness d of first bonding sheet1With institute
State the thickness d of the second bonding sheet2The ratio between d1/d2It is less than 0.5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016248511A JP6850601B2 (en) | 2016-12-21 | 2016-12-21 | Image display device |
| JP2016-248511 | 2016-12-21 |
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| CN108230900A true CN108230900A (en) | 2018-06-29 |
| CN108230900B CN108230900B (en) | 2021-08-10 |
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| CN201711376423.3A Active CN108230900B (en) | 2016-12-21 | 2017-12-19 | Image display device |
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| JP (1) | JP6850601B2 (en) |
| KR (1) | KR102249906B1 (en) |
| CN (1) | CN108230900B (en) |
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| CN110136581A (en) * | 2019-04-01 | 2019-08-16 | 陈波 | The attaching process of plastic optical glue and application and a kind of display |
| CN110780482A (en) * | 2018-07-24 | 2020-02-11 | 住友化学株式会社 | Laminate and method for producing same |
| CN111415589A (en) * | 2020-04-02 | 2020-07-14 | 武汉华星光电半导体显示技术有限公司 | Flexible module |
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| JP7168148B2 (en) * | 2018-09-14 | 2022-11-09 | 日本カーバイド工業株式会社 | Adhesive composition for polarizing plate and polarizing plate with adhesive layer |
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Also Published As
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| TW201825625A (en) | 2018-07-16 |
| JP6850601B2 (en) | 2021-03-31 |
| JP2018101117A (en) | 2018-06-28 |
| KR102249906B1 (en) | 2021-05-07 |
| KR20180072556A (en) | 2018-06-29 |
| TWI750259B (en) | 2021-12-21 |
| CN108230900B (en) | 2021-08-10 |
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