CN108977102A - Double-sided adhesive sheet, 3D liquid crystal panel and manufacturing method thereof - Google Patents
Double-sided adhesive sheet, 3D liquid crystal panel and manufacturing method thereof Download PDFInfo
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- CN108977102A CN108977102A CN201810552902.4A CN201810552902A CN108977102A CN 108977102 A CN108977102 A CN 108977102A CN 201810552902 A CN201810552902 A CN 201810552902A CN 108977102 A CN108977102 A CN 108977102A
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- adhesive layer
- double
- adhesive sheet
- sheet material
- sided adhesive
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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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
-
- 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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
-
- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- 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
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
the present invention provides a double-sided adhesive sheet comprising a transparent film substrate, a UV-curable 1 st adhesive layer laminated on one surface of the transparent film substrate, and a UV-curable 2 nd adhesive layer laminated on the other surface of the transparent film substrate, wherein the 1 st adhesive layer and the 2 nd adhesive layer comprise a urethane (meth) acrylate as a UV-curable prepolymer and a photopolymerization initiator, the content of the photopolymerization initiator is 0.5 parts by mass or more per 100 parts by mass of the urethane (meth) acrylate, and the melt viscosity of each of the 1 st adhesive layer and the 2 nd adhesive layer at 50 ℃ before UV curing is 1.0 × 105～3.0×106Poise and a melt viscosity change rate of 75 to 95% at 50 to 100 ℃.
Description
Technical field
The present invention relates to double-sided adhesive sheet material, 3D liquid crystal display panel and its manufacturing methods.
Background technique
Currently, liquid crystal display (LCD) has become very common display along with the universal of digitized electronic equipment
Device, by as liquid crystal TV set, PC display, mobile telephone terminal, pocket game machine, electronic calculator, clock and watch etc.
The display unit of various equipment uses.Especially, in recent years, such as in order to assign 3D function, there is the phase that will be formed by glass
Product made of poor plate (hreinafter referred to as " phase plate ") is Nian Jie with LCD.Herein, for being bonded with the LCD of phase plate and
Speech, recycles after use sometimes and only recycles to LCD.Such as, it is desirable that by phase plate peeled from LCD and to LCD into
Row reprocessing (rework).At this point, using following means in the previous method: by LCD, integrally cooling (in other words, will glue
It is cooling to connect agent), phase plate is peeled from LCD.However, being needed for carrying out cooling equipment, workability can not in this method
Say it is good.Further, since phase plate and LCD all have rigidity, therefore, there is the one party when peeling that breakage occurs in this way
The problem of.That is, after LCD is Nian Jie with phase plate, being easy to carry out stripping at normal temperature for previous adhesive sheet
It falls and reprocessing is carried out to LCD and be difficult.
In order to solve problem as described above, at normal temperature and even if when bonded object is hard as glass
The adhesive sheet that can be easily peeled off is studied.For example, proposing the jointing material such as flowering structure in patent document 1:
The inside folded by adhesive phase has internal removing interface.Describing in patent document 1 can be real simultaneously by the jointing material
Reliability at existing re-workability and adhesive surface (its can peeling-off, foam etc.).
Existing technical literature
Patent document
Patent document 1: No. 5514817 bulletins of Japanese Patent No.
Summary of the invention
Problems to be solved by the invention
The adhesive (Japanese: adhesion drug) recorded in patent document 1 has 2 layers or more of adhesive, is arranged inside it
There is internal removing interface.However, for the adhesive of the document, before and after fitting in various bonded objects, without meaning
Therefore adhesive is being fitted in phase difference by the chemical reaction to be occurred (in other words, it is difficult to the state change of adhesive occur)
When plate, LCD, the concave-convex tracing ability on each bonded object surface is become inadequate, becomes and the uneven reason of display occurs.It is another
Aspect, it is also contemplated that in order to enable it is uneven and reduce the melt viscosity of adhesive that display does not occur, but in this case, bonding
Power is become too strong, and reprocessing becomes difficult.In addition, in the case where melt viscosity is greatly reduced, it may occur that asked as following
Topic: mobility becomes excessively high, and cohesive force is insufficient, is compromised with the retentivity of various bonded objects, bonding force, can not especially protect
Hold the reliability under hot environment.
In view of the foregoing, the purpose of the present invention is to provide a kind of double-sided adhesive sheet material, 3D liquid crystal display panel and its manufactures
Method, the double-sided adhesive sheet material in the case where not damaging bonded object due to that can be peeled off (for example, even if under room temperature
Can be peeled off in the case where not damaging bonded object) and make it possible to reprocess bonded object, and have excellent
Reliability and stickiness.
Means for solving the problems
Present inventor has made intensive studies in order to solve the above problems, as a result, it has been found that, there is specific knot
Structure and the double-sided adhesive sheet material of physical property can solve the above subject, so as to complete the present invention.
That is, the present invention is as described below.
(1)
Double-sided adhesive sheet material, it includes transparent film base materials, the UV curing type for the one side for being laminated in aforementioned transparent film base material
The 1st bonding agent (Japanese: then drug) layer and be laminated in aforementioned transparent film base material another side UV curing type it is the 2nd viscous
Oxidant layer is connect,
Aforementioned 1st adhesive layer and the 2nd adhesive layer include the carbamate (methyl) as UV curing type prepolymer
Acrylate (urethane (meth) acrylate) and Photoepolymerizationinitiater initiater, relative to aforementioned carbamate (methyl) third
The content of foregoing photo-polymerization initiator for 100 mass parts of olefin(e) acid ester is 0.5 mass parts or more,
Aforementioned 1st adhesive layer and melt viscosity when each leisure UV of the 2nd adhesive layer 50 DEG C before curing be 1.0 ×
105~3.0 × 106It moors (poise), also, the melt viscosity change rate from 50 DEG C to 100 DEG C is 75~95%.
(2)
(1) double-sided adhesive sheet material, wherein aforementioned transparent film base material is handled without demoulding.
(3)
(1) or the double-sided adhesive sheet material of (2), wherein the thickness of each layer of aforementioned 1st adhesive layer and the 2nd adhesive layer
It is 10~75 μm.
(4)
(1) the double-sided adhesive sheet material of any one of~(3), wherein aforementioned 2nd adhesive layer also contains the more officials of UV curing type
It can monomer.
(5)
(4) double-sided adhesive sheet material, wherein in aforementioned 2nd adhesive layer, relative to aforementioned carbamate (methyl) third
The content of aforementioned UV curing type polyfunctional monomer for 100 mass parts of olefin(e) acid ester is 15~60 mass parts.
(6)
(1) the double-sided adhesive sheet material of any one of~(5), wherein the weight of aforementioned carbamate (methyl) acrylate
Average molecular weight is 10,000~120,000, and the double bond equivalent of aforementioned carbamate (methyl) acrylate is 1,000~5,
000g/eq。
(7)
(1) the double-sided adhesive sheet material of any one of~(6), wherein foregoing photo-polymerization initiator is acylphosphine oxide system light
Polymerization initiator.
(8)
(4) the double-sided adhesive sheet material of any one of~(7), wherein aforementioned UV curing type polyfunctional monomer be with 2 with
(methyl) acrylic monomer ((meth) acrylic monomer) of upper functional group.
(9)
3D liquid crystal display panel, it includes patterning phase difference glass plate, liquid crystal display and by preceding patterning phase difference glass
The double-sided adhesive sheet material of any one of glass plate (1) Nian Jie with foregoing liquid crystal display~(8),
Aforementioned 1st adhesive layer is configured in preceding patterning phase difference glass plate side, and aforementioned 2nd adhesive layer is configured
In foregoing liquid crystal display side.
(10)
(9) 3D liquid crystal display panel, wherein UV solidify after aforementioned 1st adhesive layer and preceding patterning phase difference glass
180 ° of peel strengths between plate are 400mN/25mm or more, UV solidify after aforementioned 1st adhesive layer and aforementioned transparent film base
180 ° of peel strengths between material are 400mN/25mm or more.
(11)
(9) or the 3D liquid crystal display panel of (10), wherein UV solidify after aforementioned 2nd adhesive layer and aforementioned transparent film base material
Between 180 ° of peel strengths be 50~200mN/25mm, UV solidify after aforementioned 2nd adhesive layer and foregoing liquid crystal display
Between 180 ° of peel strengths be 400mN/25mm or more.
(12)
The manufacturing method of 3D liquid crystal display panel has used the double-sided adhesive sheet of any one of (1)~(8) in the manufacturing method
Material,
The manufacturing method includes following processes:
Aforementioned double-sided adhesive sheet material is fitted in into patterning phase difference glass plate and liquid crystal not carry out the cured state of UV
Between display, UV solidification is then carried out.
The effect of invention
Through the invention, it is possible to provide following double-sided adhesive sheet materials, 3D liquid crystal display panel and its manufacturing method, the double-sided adhesive
Sheet material due to can be peeled off in the case where not damaging bonded object (for example, under room temperature can not damage it is glued
Peeled off in the case where object) and make it possible to reprocess bonded object, and there is excellent reliability and stickiness.
Specific embodiment
Hereinafter, recording a specific embodiment of the invention (hereinafter referred to as " present embodiment " in detail.).It needs to illustrate
It is that the present invention is not limited to the following embodiments and the accompanying drawings, various modifications can be carried out within the scope of its subject matter to implement.
[double-sided adhesive sheet material]
Double-sided adhesive sheet material in present embodiment includes transparent film base material, the one side for being laminated in aforementioned transparent film base material
UV curing type the 1st adhesive layer and be laminated in aforementioned transparent film base material another side UV curing type the 2nd bonding agent
Layer, aforementioned 1st adhesive layer and the 2nd adhesive layer include carbamate (methyl) acrylic acid as UV curing type prepolymer
Ester and Photoepolymerizationinitiater initiater, the foregoing photo-polymerization for 100 mass parts of aforementioned carbamate (methyl) acrylate
The content of initiator is 0.5 mass parts or more, aforementioned 1st adhesive layer and 50 DEG C before curing of each leisure UV of the 2nd adhesive layer
When melt viscosity be 1.0 × 105~3.0 × 106Pool, also, the melt viscosity change rate from 50 DEG C to 100 DEG C be 75~
95%.For the double-sided adhesive sheet material of present embodiment, by having above-mentioned structure, it can be glued as a result, not damaging
It is peeled off in the case where connecing object, so as to reprocess to bonded object, and there is excellent reliability and stickiness.It is right
For the double-sided adhesive sheet material of present embodiment, for example, easily LCD can be peeled off simultaneously from bonded object at normal temperature
It is reprocessed, also, good reliability can be assigned.
Double-sided adhesive sheet material in present embodiment has 3 layers or more comprising transparent film base material and 2 kinds of adhesive layers
Structure, aforementioned 1st adhesive layer are laminated in the one side of aforementioned transparent film base material, and aforementioned 2nd adhesive layer is laminated in aforementioned transparent
The another side of film base material.
[transparent film base material]
It as the material for constituting transparent film base material, is not particularly limited, polyethylene terephthalate, poly- pair can be enumerated
Benzene dicarboxylic acid butanediol ester, polyethylene, polyurethane polyureas propylene, polycarbonate, triacetyl cellulose, polyvinyl alcohol, polystyrene
Deng.It can be used alone a kind in these materials, or also can be used in combination two or more.In above-mentioned material, from reliability, stripping
From the viewpoint of property, it is preferably selected from by polyethylene terephthalate, polybutylene terephthalate (PBT) and polyethylene
One or more of group of composition, more preferably polyethylene terephthalate.
The thickness of transparent film base material is preferably 10~100 μm, and more preferably 25~75 μm.By make with a thickness of 100 μm with
It is interior, so that there are following tendencies: for example, the image quality of image becomes better, can more fully ensure the field angle of 3D image；It is logical
Crossing makes with a thickness of 10 μm or more, so that there are operability to become more good tendency.
It is de- due to above-mentioned 1st adhesive layer and the 2nd adhesive layer for the double-sided adhesive sheet material of present embodiment
Mould is excellent, therefore, even if transparent film base material is handled without demoulding, it may have sufficient release property.On the other hand, if hyaline membrane
Substrate has carried out demoulding processing, then compared with the case where handling without demoulding, release property is more excellent.At demoulding at this time
Reason, can enumerate the processing using progress such as alkyd system, polysiloxane series, unsaturated polyester system, polyolefin, wax systems.
[adhesive layer]
Double-sided adhesive sheet material in present embodiment include the one side for being laminated in transparent film base material the 1st adhesive layer and
It is laminated in the 2nd adhesive layer of another side.It is pre- as UV curing type that 1st adhesive layer and the 2nd adhesive layer respectively contain (A)
Carbamate (methyl) acrylate of polymers is (hereinafter also referred to as " (A) ingredient ".) and (B) Photoepolymerizationinitiater initiater (hereinafter,
Also referred to as " (B) ingredient ".).For the 2nd adhesive layer, other than comprising above-mentioned (A) ingredient and (B) ingredient, from can general
The peel strength at the interface of the 2nd adhesive layer and transparent film base material is adjusted to from the viewpoint of more suitable range, is preferably also wrapped
Containing (C) UV curing type polyfunctional monomer (hereinafter also referred to as " (C) ingredient ".).
For the 1st adhesive layer and the 2nd adhesive layer for including in the double-sided adhesive sheet material of present embodiment, UV is solid
Melt viscosity when 50 DEG C before change is 1.0 × 105~3.0 × 106Pool, also, UV is before curing molten from 50 DEG C to 100 DEG C
Melt-viscosity change rate is 75~95%.By making melt viscosity within the above range, so that being glued to various when fitting
The concave-convex tracing ability for connecing object surface becomes well, and stickiness is excellent.In addition, passing through the melt viscosity made from 50 DEG C to 100 DEG C
Change rate within the above range, thus be able to maintain after fitting the concave-convex tracing ability to various bonded object surfaces,
Inhibit display when lighting LCD and being shown uneven, also, for example when showing 3D image, the generation that can prevent 3D from deviating.
Herein, so-called " 3D offset ", refer to following phenomenons: being able to achieve 3D display carry out patterning phase difference glass plate and LCD
After contraposition, when being handled using autoclave (autoclave) and implementing to be bonded, mobility is excessively high, and positional shift occurs, becomes unable to
Carry out 3D display.
1st and the 2nd adhesive layer is more preferably 80 in the UV melt viscosity change rate before curing from 50 DEG C to 100 DEG C~
90%.Herein, melt viscosity can be measured according to the method recorded in aftermentioned embodiment, melt viscosity change rate refer to according to
Under formula (1) calculate value.
Melt viscosity change rate=(melt viscosity at -100 DEG C of melt viscosity at 50 DEG C)/(melting at 50 DEG C is viscous
Degree) × 100 ... (1)
In addition, melt viscosity change rate can for example be solidified by molecular weight, (C) UV of change (A) UV curing type prepolymer
The additive amount of type polyfunctional monomer is adjusted.
< (A) ingredient >
Carbamate (methyl) acrylate of so-called (A) as UV curing type prepolymer, refers in main chain and includes
Carbamate structures, in the side chain include (methyl) acrylic acid series group ((meth) acryl group) prepolymer.As
Carbamate (methyl) acrylate, is not particularly limited, and can enumerate carbamate for example with polycarbonate backbone
(methyl) acrylate, carbamate (methyl) acrylate, the carbamic acid with polyester backbone with polyether skeleton
Ester (methyl) acrylate etc., wherein from solidify adhesive sheet without xanthochromia from the viewpoint of, preferably have polycarbonate bone
Carbamate (methyl) acrylate of frame.
So-called carbamate (methyl) acrylate with polycarbonate backbone, refer to has poly- carbonic acid in main chain
Ester structure and carbamate structures, the prepolymer in the side chain with (methyl) acrylic acid series group.With polycarbonate bone
Carbamate (methyl) acrylate of frame for example can be by keeping polycarbonate glycol, diisocyanate and carboxylic acid glycol anti-
Ying Hou, it reacts and obtains with (methyl) glycidyl acrylate.
The weight average molecular weight of polycarbonate glycol is preferably 170~1,000, more preferably 300~700, further preferably
It is 400~600.When the weight average molecular weight of polycarbonate glycol is above range, existing can be to carbamate prepolymer main chain
Assign the tendency of the required film property for reprocessing.
It as diisocyanate, is not particularly limited, such as 2,4- toluene di-isocyanate(TDI) (2,4-TDI), 2 can be enumerated,
6- toluene di-isocyanate(TDI) (2,6-TDI), 4,4 '-methyl diphenylene diisocyanates (4,4 '-MDI), 2,4 '-diphenyl methanes
Diisocyanate (2,4 '-MDI), 1,4- phenylene diisocyanate, xylylene diisocyanate (XDI), two methylene of durol
Diisocyanate (TMXDI), dimethyl diphenyl diisocyanate (TODI, tolidine diisocyanate), 1,5- naphthalene two are different
The aromatic isocyanates such as cyanate (NDI)；Hexamethylene diisocyanate (HDI), trimethyl-hexamethylene diisocyanate
(TMHDI), the aliphatic polyisocyantes such as lysine diisocyanate, norbornene alkyl diisocyanate (NBDI)；Trans--hexamethylene
The ester ring types polyisocyanates such as alkane -1,4- diisocyanate, isophorone diisocyanate (IPDI), H6XDI (hydrogenation XDI)
Deng, wherein from the viewpoint of optical characteristics (being not susceptible to xanthochromia), preferably 1, hexamethylene-diisocyanate.
It as carboxylic acid glycol, is not particularly limited, can enumerate such as dimethylolpropionic acid, dihydromethyl propionic acid.
So-called carbamate (methyl) acrylate with polyether skeleton, refer in main chain have polyether structure and
Carbamate structures, the prepolymer in the side chain with (methyl) acrylic acid series group, the carbamic acid with polyester backbone
Ester (methyl) acrylate refers in main chain with polyester construction and carbamate structures, in the side chain with (methyl) third
The prepolymer of olefin(e) acid system group.These prepolymers can obtain by the following method: be replaced respectively using polyetherdiol, polyester-diol
Polycarbonate glycol, in addition to this, using same with above-mentioned carbamate (methyl) acrylate with polycarbonate backbone
The method of sample carries out.At this point, the numberical range as the respective preferred weight average molecular weight of polyetherdiol and polyester-diol, can lift
The numberical range of the preferred weight average molecular weight of above-mentioned polycarbonate glycol out.
(A) weight average molecular weight of ingredient is preferably 10,000~120,000, more preferably 30,000~70,000, into one
Step preferably 40,000~60,000.(A) weight average molecular weight of ingredient within the above range when, there are following tendencies: film formation property,
Curability becomes well, and reliability (for example, long-term reliability) becomes better.Herein, weight average molecular weight refers to: using average
Standard polystyren that molecular weight is about 500~about 1,000,000, the value measured using gel permeation chromatography (GPC).
(A) the double bond equivalent of ingredient is preferably 1,000~5,000g/eq, more preferably 1,500~2,500g/eq, into one
Step is preferably 1,800~2,200g/eq.(A) when the double bond equivalent of ingredient is in above range, there are following tendencies: solidification is received
The influence of contracting is small, and reliability (for example, long-term reliability) is more excellent, in addition, solidification becomes easier to, reprocessing also becomes more to hold
Easily.Herein, double bond equivalent refers to: by the solid state component quality (g) of (methyl) acrylate containing carboxyl/have oxa- ring
The molal quantity (g/mol) of the compound of propane ring and ethylenic bond unsaturated bond and the value calculated.
(A) glass transition temperature (Tg) of ingredient is preferably -10~20 DEG C, more preferably -5~15 DEG C, further excellent
It is selected as 0~10 DEG C.Glass transition temperature within the above range when, there are reliability (for example, long-term reliability) and reprocessing
The harmony of property becomes more good tendency.Herein, glass transition temperature refers to is measured by Measurement of Dynamic Viscoelasticity (DMA)
Value.
< (B) ingredient >
As (B) Photoepolymerizationinitiater initiater, be not particularly limited, can enumerate such as acylphosphine oxide system Photoepolymerizationinitiater initiater,
Alkyl phenones system Photoepolymerizationinitiater initiater, intramolecular hydrogen capture type Photoepolymerizationinitiater initiater etc..It can be used alone these photopolymerization to draw
1 kind in agent is sent out, or also can be used in combination two or more.In these, from the viewpoint of reactivity and cured uniformity,
It is preferred that acylphosphine oxide system Photoepolymerizationinitiater initiater.As the concrete example of acylphosphine oxide system Photoepolymerizationinitiater initiater, 2,4 can be enumerated,
6- trimethylbenzoyl phenyl phosphine oxide, 2,2- dimethoxy -1,2- diphenylethane -1- ketone, methyl benzoylformate
(phenylglyoxylic acid methyl ester) etc..In these, deep curability higher from free radical generation efficiency
From the viewpoint of more excellent, preferably 2,4,6- trimethylbenzoyl phenyl phosphine oxides.
< (C) ingredient >
The 2nd adhesive layer in present embodiment also solidifies comprising (C) UV preferably other than comprising (A) and (B) ingredient
Type polyfunctional monomer.In order to can be carried out the reprocessing of LCD, need to improve the viscoplasticity under room temperature, by UV curing type pre-polymerization
Object further adds UV curing type polyfunctional monomer, thus the crosslink density after can be further improved the solidification of the 2nd adhesive layer,
It can be further improved the viscoplasticity under room temperature.
It as (C) ingredient, is not particularly limited, as long as the monomer with 2 or more functional groups, can enumerate for example
(methyl) acrylic monomer, wherein from the viewpoint of improving crosslink density, improving re-workability, preferably there are 2 or more
(methyl) acrylic monomer of functional group.
About (C) ingredient, specifically, 1,4-butanediol two (methyl) can be enumerated as the monomer with 2 functional groups
Acrylate, ethylene glycol two (methyl) acrylate, glycerol two (methyl) acrylate, Tricyclodecane Dimethanol diacrylate
Ester can enumerate trimethylolpropane trimethacrylate, Pehanorm three (methyl) as the monomer with 3 functional groups
Acrylate, trimethylolpropane epoxy pronane modification three (methyl) acrylate can as the monomer with 4 functional groups
Enumerate dipentaerythritol four (methyl) acrylate, pentaerythrite ethylene-oxide-modified four (methyl) acrylate, pentaerythrite
Four (methyl) acrylate, pentaerythrite ethylene-oxide-modified four (methyl) acrylate, double trimethylolpropane four (methyl)
Acrylate, dipentaerythritol hexaacrylate etc..In these, from re-workability it is more excellent from the viewpoint of, more preferably have 4
(methyl) acrylic monomer of a above functional group, further preferably with six acrylic acid of dipentaerythritol of 6 functional groups
Ester.
In each layer of the 1st adhesive layer and the 2nd adhesive layer, relative to aforementioned 100 mass of (A) ingredient wherein included
The content of aforementioned (B) ingredient for part is 0.5 mass parts or more, it is more than preferably 1.0 mass parts, more preferably 1.5 mass
Part or more.(B) when the content of ingredient is 0.5 mass parts or more, solidification reactivity becomes well, re-workability, reliability (example
Such as, long-term reliability) it improves.The upper limit of content as (B) ingredient, is not particularly limited, if excessively, there are optical characteristics
The tendency of decline, thus preferably 7.0 below the mass.
In the 2nd adhesive layer, the content of (C) ingredient for 100 mass parts of (A) ingredient wherein included is excellent
It is selected as 15~60 mass parts, more preferably 18~40 mass parts, further preferably 20~30 mass parts.(C) content of ingredient
When to be more than 15 mass parts, the re-workability deposited at normal temperature becomes more good tendency, be 60 below the mass when, there are viscous
Connecing property becomes more abundant, reliability (for example, long-term reliability) more excellent tendency.In addition, relative to 100 mass of (A) ingredient
When the content of (C) ingredient for part is adjusted to above range, there are it is following the advantage that: constitute the 2nd adhesive layer
The melt viscosity of resin combination is kept in a certain range, therefore, becomes to be not susceptible to fitting unevenness, the confusion of image.
It should be noted that the mass parts in above-mentioned content refer to the mass parts to be converted into terms of solid state component.
< (D) silane coupling agent >
The adhesive layer of double-sided adhesive sheet material in present embodiment can be other than comprising above-mentioned (A)~(C) ingredient
Also comprising (D) silane coupling agent (hereinafter also referred to as " (D) ingredient ".).Especially, it when the viscoplasticity of the 2nd adhesive layer is high, deposits
In the tendency with the decline of the cementability of bonded object, but when containing silane coupling agent, there are following tendencies: bonding force can be maintained,
Reliability (for example, long-term reliability) when especially bonded object is glass plate further increases.
It as (D) ingredient, is not particularly limited, for example, haplotype silane coupling agent, alkoxy oligomeric are silane coupled
Any silane coupling agent in agent, multifunctional type silane coupling agent etc. can be used.Wherein, from improve bonded object be glass when
Cementability and from the viewpoint of keeping long-term reliability such, it is preferably silane coupled with (methyl) acrylic acid series group
Agent, more preferable 3- acryloyloxypropyltrimethoxysilane.
The content of (D) ingredient for 100 mass parts of (A) ingredient is preferably 0.1~5 mass parts, more preferably
0.5~3.0 mass parts, further preferably 0.5~1.5 mass parts.(D) when the content of ingredient is above range, exist long-term
Reliability and the harmony of re-workability become more good tendency.
< other compositions >
In adhesive layer in present embodiment, other than above-mentioned (A)~(D) ingredient, also may include silica,
The various fillers such as aluminium oxide, hydrated alumina, antioxidant, ultraviolet absorbing agent, light stabilizer, antistatic agent, levelling agent
The additive that (leveling agent), defoaming agent, coloring pigment, organic solvent etc. can usually be added in bonding agent.
It as the manufacturing method of the double-sided adhesive sheet material in present embodiment, is not particularly limited, for example, by transparent
Coating constitutes the resin combination of the 1st adhesive layer and makes it dry on film base material, and then also coating constitutes the 2nd on opposing sides
The resin combination of adhesive layer simultaneously makes it dry, so as to obtain that two sides is provided with the double-sided adhesive sheet material of adhesive layer.
It is particularly preferred that making the resin combination for constituting adhesive layer form varnish using organic solvent, being then coated on
On bright film base material, it is dried.As workable organic solvent at this time, it is not particularly limited, such as toluene, methyl can be enumerated
Ethyl ketone, cyclohexanone, propylene glycol monomethyl ether, dimethyl acetamide etc..It can be used alone a kind in these organic solvents,
Or it also can be used in combination two or more.In these, from the viewpoint of dissolubility, preferred methyl ethyl ketone.In addition, relative to
(A) for 100 mass parts of ingredient, the content of the organic solvent in varnish is preferably 30~90 mass parts, more preferably 40~70
Mass parts.
It can suitably be applied using comma as the method for being coated with resin combination in transparent base film according to coating thickness
Cloth machine, die coating machine, gravure coater etc..The drying of resin combination can be implemented by online dry machine etc., drying at this time
Condition can be according to the type of each ingredient and amount etc. come appropriate adjustment.
The thickness of each layer of 1st adhesive layer and the 2nd adhesive layer is preferably 10~75 μm, and more preferably 20~60 μm,
Further preferably 30~50 μm.It should be noted that so-called thickness herein, refer to it is dry after thickness.With a thickness of 10 μm with
When upper, there are cementabilities to become the tendency that better, reliability (for example, long-term reliability) further increases.It is so-called " for a long time
By property ", specifically include following situations: the cementability of LCD and patterning phase difference glass plate becomes well, thus deviates and become
It must be difficult to happen, as a result, observer is it is observed that good 3D image.On the other hand, the 1st and the 2nd adhesive layer with a thickness of
At 75 μm or less, there are following tendencies: LCD becomes suitable at a distance from patterning phase difference glass plate, when watching 3D image,
It can ensure that appropriate field angle.
It, can be in each layer of the 1st adhesive layer and the 2nd adhesive layer on double-sided adhesive sheet material in the present embodiment
Protective film is further arranged in outside.It as protective film, is not particularly limited, can enumerate for example by selected from by poly terephthalic acid second
The resin of one or more of the group of diol ester, polyethylene naphthalate and polybutylene terephthalate (PBT) composition is formed
Film.In these, from the viewpoint of reducing manufacturing cost, the film that is preferably formed by pet resin.
For protective film, demoulding processing can be implemented to the lamination surface of adhesive layer.By implementing to demould to protective film
Processing, so as to will easily protect film stripping when in use, therefore, operability is improved.It handles as demoulding, does not limit especially
System, for example, using following methods: de- using polysiloxane series release agent, fluorine system releasing agent, chain alkyl graft polymers system
The method, etc. that the release agents such as mould agent, corona treatment are surface-treated.
[3D liquid crystal display panel]
3D liquid crystal display panel in present embodiment includes patterning phase difference glass plate, liquid crystal display (LCD) and by institute
The double-sided adhesive sheet material for the present embodiment that patterning phase difference glass plate is bonded with the liquid crystal display (LCD) is stated, it is aforementioned
1st adhesive layer is configured in preceding patterning phase difference glass plate side, and it is aobvious that aforementioned 2nd adhesive layer is configured in foregoing liquid crystal
Show device side.
For the 3D liquid crystal display panel in present embodiment, phase will be patterned by using above-mentioned double-sided adhesive sheet material
Potential difference glass plate is Nian Jie with LCD, so as to do not damage patterning phase difference glass plate, LCD in the case where, easily transparent
It is removed at the interface of film base material and the 2nd adhesive layer.Next, by the way that LCD is removed from the 2nd adhesive layer, so as to right
LCD is recycled.
For the 1st adhesive layer, after UV solidification, the storage modulus under room temperature (25 DEG C) is preferably 1.0 × 105~
1.0×108Pa, more preferably 5.0 × 105~5.0 × 107Pa, further preferably 1.0 × 106~1.0 × 107Pa.1st is viscous
When the storage modulus for connecing oxidant layer is above range, there are following tendencies: especially under hot and humid environment, reliability becomes
It is better.For the 2nd adhesive layer, after UV solidification, the storage modulus under room temperature (25 DEG C) is preferably 1.0 × 108~
1.0×1010Pa, more preferably 5.0 × 108~5.0 × 109Pa, further preferably 8.0 × 108~2.0 × 109Pa.2nd is viscous
The storage modulus for connecing oxidant layer is 1.0 × 108When above, there are following tendencies: become more suitable with the bonding force of transparent film base material,
Re-workability further increases.On the other hand, the storage modulus of the 2nd adhesive phase is 1.0 × 1010When Pa or less, there are following
Tendency: the reliability especially under hot and humid environment becomes better.
The viscoplasticity of adhesive layer can be measured by Measurement of Dynamic Viscoelasticity (DMA), specifically, can be according to aftermentioned
The method measurement recorded in embodiment.
For the peel strength at the interface of each layer, from the harmony of re-workability and reliability from the viewpoint of, it is excellent
180 ° of peel strengths between the 1st adhesive layer after selecting UV to solidify and patterning phase difference glass plate be 400mN/25mm with
On, UV solidify after the 1st adhesive layer and transparent film base material between peel strength be 400mN/25mm or more (180 ° of directions).
On the other hand, the 2nd adhesive layer after preferably UV solidifies and 180 ° of peel strengths between transparent film base material be 50mN/25mm with
Upper 200mN/25mm or less (180 ° of directions), UV solidify after the 2nd adhesive layer and LCD between peel strength be 400mN/
25mm or more.180 ° of peel strengths can be found out by the method recorded in aftermentioned embodiment.
Double-sided adhesive sheet material in present embodiment cannot be only used for the purposes of 3D liquid crystal display panel, can also anticipation to LCD,
The display devices such as organic EL are reprocessed all with using on the way.As such purposes, such as touch sensing can be enumerated
Device panel, digital signage etc..
[manufacturing method of 3D liquid crystal display panel]
The manufacturing method of the 3D liquid crystal display panel of present embodiment is the 3D for having used the double-sided adhesive sheet material of present embodiment
The manufacturing method of liquid crystal display panel comprising following processes: double-sided adhesive sheet material is fitted in into figure not carry out the cured state of UV
Between case phase difference glass plate and liquid crystal display, UV solidification is then carried out.It, can be by following as the concrete example of the process
Mode obtains: being bonded double-sided adhesive sheet material on patterning phase difference glass plate, is then bonded LCD, and then irradiate UV, makes two-sided
Adhesive sheet carries out UV solidification.As UV irradiation condition, it is not particularly limited.
It should be noted that can be according to below as long as no being expressly recited about each physical property etc. in present embodiment
The measurement of method shown in embodiment.
Embodiment
Hereinafter, further specifically describing the present invention by Examples and Comparative Examples, but the present invention is not limited only to these
Embodiment.
Each ingredient and material used in Examples and Comparative Examples are as described below.
[(A) ingredient: UV curing type prepolymer]
According to synthesis example 1~7 below and compare synthesis example 1, makes UV curing type prepolymer (a)~(h).
[(B) ingredient: Photoepolymerizationinitiater initiater]
(1) Photoepolymerizationinitiater initiater (a)
2,4,6- trimethylbenzoyl phenyl phosphine oxide
BASF AG's system, trade name " Irgacure TPO ", acylphosphine oxide system Photoepolymerizationinitiater initiater
(2) Photoepolymerizationinitiater initiater (b)
2,2- dimethoxy -1,2- diphenylethane -1- ketone
BASF AG's system, trade name " Irgacure 651 ", alkyl phenones system Photoepolymerizationinitiater initiater
(3) Photoepolymerizationinitiater initiater (c)
Methyl benzoylformate
BASF AG's system, trade name " Irgacure MBF ", intramolecular hydrogen captures type Photoepolymerizationinitiater initiater
[(C) ingredient: UV curing type polyfunctional monomer]
(1) UV curing type polyfunctional monomer (a)
Dipentaerythritol hexaacrylate
DAICEL-ALLNEX corporation, product name " DPHA "
(2) UV curing type polyfunctional monomer (b)
Tricyclodecane Dimethanol diacrylate
DAICEL-ALLNEX corporation, product name " IRR214-K "
(3) UV curing type polyfunctional monomer (c)
Trimethylolpropane trimethacrylate
DAICEL-ALLNEX corporation, product name " TMPTA "
[other compositions]
Adhesive
3M corporation, product name " Optically Clear Adhesive 8146 "
The evaluation method and measuring method of each physical property are as described below.
[re-workability]
(1) sample making step
The demoulding PET film of side adhesive layer (A) of double-sided adhesive sheet material is removed, patterning is fitted in by lamination
Phase difference glass plate (0.7t, 19 inches) carries out autoclave processing.For lamination, roll lamination (roll is utilized
Laminate), laminating roll (lami-roll) temperature is 25~40 DEG C, laminating roll line pressure is 1.0~2.0kgf/cm, laminating roll
Speed is to implement under conditions of 0.3~2.0m/ minute, for autoclave is handled, temperature is 60 DEG C, pressure is
0.6MPa, time are to implement under conditions of 10 minutes.Next, the demoulding PET film of the side adhesive layer (B) is removed, by true
Dead level pressure is bonded with LCD, carries out autoclave processing again, is then carried out UV exposure, is thus obtained test specimen.For vacuum layer
For pressure, temperature is 25~50 DEG C, pressure is 0.01~0.05MPa, the pumpdown time is 60 seconds, pressing time is 30 seconds
Under the conditions of implement.It is real under conditions of temperature is 60 DEG C, pressure 0.6MPa, time are 1 hour for autoclave processing
It applies.Using ultra high pressure mercury lamp source, 3000mJ/cm is become with accumulated light2Mode implement UV exposure.
(2) measuring method
At normal temperature, scraper plate (scraper) is inserted into the interface of untreated PET film Yu adhesive layer (B), to pry open
Test specimen is evaluated according to following standard.
◎: not damaging bonded object, can be easy to carry out reprocessing
Zero: not damaging bonded object, can be carried out reprocessing
×: bonded object damage, it is difficult to be reprocessed
[reliability]
(1) sample making step
Test specimen is made using the step same as re-workability.
(2) measuring method
Test specimen is placed in damp and hot device with the state holded up.Condition is set as follows: temperature is as 50 DEG C, humidity
80%, the time is 240 hours.Then, it places 24 hours at normal temperature.It is placed in damp and hot device to observe and start by visual observation
When compared to whether there is or not the offset of glass gluing position, float, foam, evaluated according to following standard.
Zero: the positional shift of glass not occurring, floats, foam
×: the positional shift of glass has occurred, floats, foam
[stickiness]
(1) sample making step
By the step same as re-workability, test specimen is made.
(2) measuring method
The display for lighting test specimen is evaluated by visual observation according to following standard.
Zero: fitting unevenness, 3D offset (not generating ghost image) does not occur in display image
×: fitting unevenness, 3D offset (producing ghost image) have occurred in display image
[optical characteristics]
(1) sample making step
The demoulding PET film of side adhesive layer (A) of double-sided adhesive sheet material is removed, light is fitted in by vacuum lamination
It learns glass (40mm square).For vacuum lamination, temperature is 25~50 DEG C, pressure is 0.01~0.05MPa, is vacuumized
Implement under conditions of time is 60 seconds, pressing time is 30 seconds.Next, the demoulding PET film of the side adhesive layer (B) is removed,
Optical glass (40mm square) is being fitted under the same conditions with the condition of above-mentioned vacuum lamination, is then being carried out at autoclave
Reason carries out UV exposure, thus obtains test specimen.For autoclave processing for, temperature be 60 DEG C, pressure 0.6MPa,
Time is to implement under conditions of 1 hour.Using ultra high pressure mercury lamp source, 3000mJ/cm is become with accumulated light2Mode implement
UV exposure.
Use spectrophotometer (Hitachi High-Technologies Corporation U-4100), measurement examination
Test the yellow colour index (YI) of sample.Determination condition is set are as follows: illuminant-C, transmission, wavelength X=380~760nm.
◎: YI value is less than 1.5
Zero: YI value is 1.5 more than and less than 2
×: YI value is 2 or more
[melt viscosity]
(1) sample making step
Resin combination (A) and (B) are respectively coated on to 25 μm of demoulding in such a way that the thickness after drying becomes 50 μm
Then the two sides of PET, are arranged 25 μm of demoulding PET in opposing face, make double-sided adhesive sheet in 130 DEG C of progress drying in 5 minutes
Material.
The demoulding PET of the adhesive sheet made in the manner described above is removed, 20 double-sided adhesive sheet materials are bonded, production is thick
Degree is the adhesive sheet of 1.0mm.At this point, implementing fitting under the following conditions using roll lamination: lamination roll temperature is 25~40
DEG C, laminating roll line pressure is 1.0~2.0kgf/cm, and lamination roller speed is 0.3~2.0m/min.
(2) measuring method
Melt viscosity is measured using measurement of dynamic viscoelasticity device (Co., Ltd. UBM Rheosol-G3000).For surveying
For fixed condition, with the heating rate of 5.0 DEG C/min, implement within the temperature range of 30~130 DEG C, basic frequency 1Hz is answered
Become and controls as 0.12deg, load control system 300g.The melt viscosity of 50 DEG C and 100 DEG C of measurement, melt viscosity when by 50 DEG C
As the form of value obtained by 100, calculate temperature from melt viscosity change rate when being increased to 100 DEG C for 50 DEG C.
[peel strength]
(1) sample making step
Peel strength between (1-1) adhesive layer A and patterning phase difference glass plate
The demoulding PET film of the side adhesive layer A of double-sided adhesive sheet material is removed, patterning phase is fitted in by lamination
Potential difference glass plate carries out autoclave processing, then makes its solidification using UV exposure.For lamination, using roll lamination,
Lamination roll temperature is 25~30 DEG C, laminating roll line pressure is 1.0~2.0kgf/cm, lamination roller speed is 0.3~2.0m/ minutes
Under the conditions of implement, it is real under conditions of temperature is 60 DEG C, pressure 0.6MPa, time are 1 hour for autoclave processing
It applies.Using ultra high pressure mercury lamp source, 3000mJ/cm is become with accumulated light2Mode implement UV exposure.
Peel strength between (1-2) adhesive layer A and transparent film base material
The demoulding PET film of the side adhesive layer A of double-sided adhesive sheet material is removed, is fitted in and is implemented easily by lamination
It is bonded the PET (Japan spins PETA4300#100) of processing, autoclave processing is carried out, then makes its solidification using UV exposure machine.
For lamination, using roll lamination, lamination roll temperature be 25~30 DEG C, laminating roll line pressure be 1.0~2.0kgf/cm,
Lamination roller speed is to implement under conditions of 0.3~2.0m/ minute, for autoclave is handled, temperature is 60 DEG C, pressure is
0.6MPa, time are to implement under conditions of 1 hour.Using ultra high pressure mercury lamp source, 3000mJ/cm is become with accumulated light2's
Mode implements UV exposure.
Peel strength between (1-3) adhesive layer B and transparent film base material
The demoulding PET film of the side adhesive layer B of double-sided adhesive sheet material is removed, is fitted in and is implemented easily by lamination
It is bonded the PET (Japan spins PETA4300#100) of processing, autoclave processing is carried out, then makes its solidification using UV exposure machine.
For lamination, using roll lamination, lamination roll temperature be 25~30 DEG C, laminating roll line pressure be 1.0~2.0kgf/cm,
Lamination roller speed is implemented under conditions of being 0.3~2.0m/min, for autoclave processing, temperature is 60 DEG C, pressure is
0.6MPa, time are to implement under conditions of 1 hour.Using ultra high pressure mercury lamp source, 3000mJ/cm is become with accumulated light2's
Mode implements UV exposure.
Peel strength between (1-4) adhesive layer B and LCD
The demoulding PET film of the side adhesive layer B of double-sided adhesive sheet material is removed, LCD is fitted in by vacuum lamination
Panel carries out autoclave processing, then makes its solidification using UV exposure machine.It is 25~50 in temperature for vacuum lamination
DEG C, pressure is 0.01~0.05MPa, implements under conditions of the pumpdown time is 60 seconds, pressing time is 30 seconds.For autoclave
For processing, implement under conditions of temperature is 60 DEG C, pressure 0.6MPa, time are 1 hour.Use ultra high pressure mercury light
Source becomes 3000mJ/cm with accumulated light2Mode implement UV exposure.
(2) measuring method
Peel strength between (2-1) adhesive layer A and patterning phase difference glass plate
The sample made in above-mentioned (1-1) is cut into 25mm wide, measurement peels off double-sided adhesive sheet material along 180 ° of directions
When peel strength.At this point, the peeling rate with 300m/min is measured.
Peel strength between (2-2) adhesive layer A and transparent film base material
The sample made in above-mentioned (1-2) is cut into 25mm wide, measurement peels off double-sided adhesive sheet material along 180 ° of directions
When peel strength.At this point, the peeling rate with 300m/min is measured.
Peel strength between (2-3) adhesive layer B and transparent film base material
The sample made in above-mentioned (1-3) is cut into 25mm wide, measurement peels off double-sided adhesive sheet material along 180 ° of directions
When peel strength.At this point, the peeling rate with 300m/min is measured.
Peel strength between (2-4) adhesive layer B and LCD
The sample made in above-mentioned (1-4) is cut into 25mm wide, measurement peels off double-sided adhesive sheet material along 180 ° of directions
When peel strength.At this point, the peeling rate with 300m/min is measured.
(synthesis example 1) UV curing type prepolymer (a)
In the four-necked bottle for having thermometer, condenser pipe and agitating device, by 1, hexamethylene-diisocyanate (Tosoh plants of formulas
Commercial firm's system, the name of an article: HDI, abbreviation: HDI) 33.3 mass parts, weight average molecular weight be 400 59.4 mass parts of polycarbonate glycol,
7.3 mass parts of dimethylolpropionic acid, as organotins such as the dibutyl tin laurates (dibutyl tin laurate) of catalyst
1 mass parts of compound and 100 mass parts of methyl ethyl ketone as organic solvent are fitted into reaction vessel, are carried out in 70 DEG C
It reacts within 24 hours.
For the reaction condition of the synthetic confirmed, analyzed using IR sensing equipment.In IR figure, it is thus identified that
NCO characteristic absorption (the 2270cm of the synthetic-1) disappear, and confirmed that synthetic is the urethane acrylates with carboxyl
Ester.
Next, obtained 100 mass parts of urethane acrylate with carboxyl, Glycidyl methacrylate is sweet
7.1 mass parts of grease, 0.7 mass parts of triethylamine as catalyst and 0.05 mass parts of hydroquinone as polymerization inhibitor
It is fitted into reaction vessel, carries out reacting for 12 hours in 75 DEG C, so that it is carried out addition reaction, obtain UV curing type pre-polymerization as a result,
Object (a).
It should be noted that terminating to add as 5mgKOH/g time point below in the acid value measured as follows
At reaction.In addition, the weight average molecular weight of obtained UV curing type prepolymer (a) is 50,000, solid component concentration is 50 matter
% is measured, double bond equivalent is that 2,000g/eq, Tg is 5 DEG C.
(acid value measuring method)
The solid state component 1g of resin is weighed, adds mixed solvent (mass ratio: toluene and methanol=50/50), after dissolution, adds
Add suitable phenolphthalein solution as indicator, titrated with the potassium hydroxide aqueous solution of 0.1N, measures acid using following formula (α)
Value.
X=10 × Vf × 56.1/ (Wp × I) (α)
(in formula (α), x indicates acid value (mgKOH/g), and Vf indicates that the titer (mL) of the KOH aqueous solution of 0.1N, Wp indicate
The quality (g) of the resin solution measured, I indicate the ratio (quality %) of the nonvolatile component in the resin solution measured.)
(synthesis example 2) UV curing type prepolymer (b)
Making 1 in 70 DEG C, hexamethylene-diisocyanate and polycarbonate glycol compound react within 18 hours, in addition to this,
It is reacted using with the same method of synthesis example 1, obtains UV curing type prepolymer (b).
The weight average molecular weight of obtained UV curing type prepolymer (b) is 10,000, and solid component concentration is 50 mass %, double
Key equivalent is that 2,000g/eq, Tg is 5 DEG C.
(synthesis example 3) UV curing type prepolymer (c)
Making 1 in 70 DEG C, hexamethylene-diisocyanate and polycarbonate glycol compound react within 48 hours, in addition to this,
It is reacted using with the same method of synthesis example 1, obtains UV curing type prepolymer (c).
The weight average molecular weight of obtained UV curing type prepolymer (c) is 120,000, and solid component concentration is 50 mass %,
Double bond equivalent is that 2,000g/eq, Tg is 5 DEG C.
(synthesis example 4) UV curing type prepolymer (d)
Instead of polycarbonate glycol, polyetherdiol has been used, in addition to this, using method same as synthesis example 1, has been obtained
UV curing type prepolymer (d).
The weight average molecular weight of obtained UV curing type prepolymer (d) is 50,000, and solid component concentration is 50 mass %, double
Key equivalent is that 2,000g/eq, Tg is 0 DEG C.
(synthesis example 5) UV curing type prepolymer (e)
Instead of polycarbonate glycol, polyester-diol has been used, in addition to this, using method same as synthesis example 1, has been obtained
UV curing type prepolymer (e).
The weight average molecular weight of obtained UV curing type prepolymer (e) is 50,000, and solid component concentration is 50 mass %, double
Key equivalent is that 2,000g/eq, Tg is 0 DEG C.
(synthesis example 6) UV curing type prepolymer (f)
Making 1 in 70 DEG C, hexamethylene-diisocyanate and polycarbonate glycol compound react within 12 hours, in addition to this,
It is reacted using with the same method of synthesis example 1, obtains UV curing type prepolymer (f).
The weight average molecular weight of obtained UV curing type prepolymer (f) is 5,000, and solid component concentration is 50 mass %, double
Key equivalent is that 2,000g/eq, Tg is 5 DEG C.
(synthesis example 7) UV curing type prepolymer (g)
Making 1 in 70 DEG C, hexamethylene-diisocyanate and polycarbonate glycol compound react within 56 hours, in addition to this,
It is reacted using with the same method of synthesis example 1, obtains UV curing type prepolymer (g).
The weight average molecular weight of obtained UV curing type prepolymer (g) is 150,000, and solid component concentration is 50 mass %,
Double bond equivalent is that 2,000g/eq, Tg is 5 DEG C.
(comparing synthesis example 1) UV curing type prepolymer (h)
In the reaction vessel for having blender, thermometer, dropping funel and nitrogen ingress pipe, it is loaded as polymer solvent
Methoxypropanol (propylene glycol monomethyl ether (PGM)) 100.0g, be warming up to 80 degree while stirring under stream of nitrogen gas.From
Following substances were added dropwise in above-mentioned reaction vessel with keeping the temperature for 80 DEG C of state, the substance by dropping funel through 3 hours are as follows:
13.5 mass parts of styrene, 67 mass parts of ethyl acrylate, 11.5 mass parts of acrylic acid, work mixed in advance prior to room temperature
For the azobis isobutyronitrile 0.5g of radical polymerization initiator.After completion of dropwise addition, 90 are warming up to while being stirred to react solution
DEG C, further progress on one side the temperature of reaction solution is remained 90 degree while 2 hours and stir, obtains copolymer.
Next, by obtained 00 mass parts of copolymer 1,7.8 mass parts of glycidyl methacrylate, as catalysis
0.8 mass parts of triethylamine of agent and 0.05 mass parts of hydroquinone as polymerization inhibitor are encased in reaction vessel, in 100
DEG C carry out 12 hours react, make its carry out addition reaction, obtain UV curing type prepolymer (h) as a result,.
It should be noted that terminating addition reaction as 5mgKOH/g time point below in acid value.In addition, obtained UV
The weight average molecular weight of curing type prepolymer (h) is 45,000, and solid component concentration is that 47 mass %, Tg are 3 DEG C.
(embodiment 1)
(1) preparation of UV curable resin composition
UV curing type prepolymer (a) 100 mass parts are added into reaction vessel, and then add Photoepolymerizationinitiater initiater (a) 0.5
Mass parts and 140 mass parts of methyl ethyl ketone as solvent, are stirred, obtain resin combination (A).
UV curing type prepolymer (a) 100 mass parts are added into reaction vessel, and then add UV curing type polyfunctional monomer
(a) 25 mass parts, 1.5 mass parts of Photoepolymerizationinitiater initiater (a) and 140 mass parts of methyl ethyl ketone as solvent, are stirred
It mixes, obtains resin combination (B).
(2) production of double-sided adhesive sheet material
Resin combination (A) obtained in above-mentioned (1) is coated in such a way that the thickness after drying becomes 50 μm or more
On 25 μm of untreated PET film, in 130 DEG C of progress drying in 5 minutes, forms adhesive layer (A) and be then arranged on opposing sides
50 μm of demoulding PET film, obtains single side adhesive sheet.
Resin combination (B) obtained in above-mentioned (1) is coated in such a way that the thickness after drying becomes 50 μm or more
On the untreated PET film of the single side adhesive sheet above made, in 130 DEG C of progress drying in 5 minutes, formed adhesive layer (B),
Then, 75 μm of demoulding PET film is set, double-sided adhesive sheet material is obtained.
Using obtained double-sided adhesive sheet material, to re-workability, reliability, stickiness, optical characteristics, melt viscosity and stripping
It is evaluated from intensity.
(embodiment 2~6) and (the Comparative Examples 1 to 5)
Adhesive layer (B) is fixed, it is obtained using the type and content of each ingredient is changed as recording in table 1 and 2
The resin combination arrived forms adhesive layer (A) and in addition to this using method similarly to Example 1, obtains double-sided adhesive sheet
Material.
It is strong to re-workability, reliability, stickiness, optical characteristics, melt viscosity and removing using obtained adhesive sheet
Degree is evaluated.
(embodiment 7~20), (comparative example 6~11)
Adhesive layer (A) is fixed, it is obtained using the type and content of each ingredient is changed as recording in table 3~5
The resin combination arrived forms adhesive layer (B) and in addition to this using method similarly to Example 1, obtains double-sided adhesive sheet
Material.
It is strong to re-workability, reliability, stickiness, optical characteristics, melt viscosity and removing using obtained adhesive sheet
Degree is evaluated.
[table 1]
※ fixes adhesive layer B
[table 2]
※ fixes adhesive layer B
[table 3]
※ fixes adhesive layer A
[table 4]
※ fixes adhesive layer A
[table 5]
※ fixes adhesive layer A
As shown in the above results, for the double-sided adhesive sheet material in present embodiment, even if at normal temperature,
LCD easily can be removed from bonded object and it is reprocessed, also, can assign good reliability and stickiness.
Industrial availability
Double-sided adhesive sheet material of the invention industrially has the utilizability of the bonding agent as liquid crystal display etc..
Claims (12)
1. double-sided adhesive sheet material, it includes transparent film base materials, the UV curing type for the one side for being laminated in the transparent film base material
1st adhesive layer and be laminated in the transparent film base material another side UV curing type the 2nd adhesive layer,
1st adhesive layer and the 2nd adhesive layer include carbamate (methyl) propylene as UV curing type prepolymer
Acid esters and Photoepolymerizationinitiater initiater, the light for 100 mass parts of the carbamate (methyl) acrylate are poly-
The content for closing initiator is 0.5 mass parts or more,
1st adhesive layer and melt viscosity when each leisure UV of the 2nd adhesive layer 50 DEG C before curing are 1.0 × 105~
3.0×106Pool, also, the melt viscosity change rate from 50 DEG C to 100 DEG C is 75~95%.
2. double-sided adhesive sheet material as described in claim 1, wherein the transparent film base material is handled without demoulding.
3. double-sided adhesive sheet material as claimed in claim 1 or 2, wherein the 1st adhesive layer and the 2nd adhesive layer it is each
Layer with a thickness of 10~75 μm.
4. double-sided adhesive sheet material according to any one of claims 1 to 3, wherein the 2nd adhesive layer is also solid containing UV
Change type polyfunctional monomer.
5. double-sided adhesive sheet material as claimed in claim 4, wherein in the 2nd adhesive layer, relative to the carbamic acid
The content of the UV curing type polyfunctional monomer for 100 mass parts of ester (methyl) acrylate is 15~60 mass parts.
6. such as double-sided adhesive sheet material according to any one of claims 1 to 5, wherein carbamate (methyl) propylene
The weight average molecular weight of acid esters is 10,000~120,000, and the double bond equivalent of carbamate (methyl) acrylate is 1,
000~5,000g/eq.
7. such as double-sided adhesive sheet material according to any one of claims 1 to 6, wherein the Photoepolymerizationinitiater initiater is acyl group oxygen
Change phosphine system Photoepolymerizationinitiater initiater.
8. the double-sided adhesive sheet material as described in any one of claim 4~7, wherein the UV curing type polyfunctional monomer is
(methyl) acrylic monomer with 2 or more functional groups.
9.3D liquid crystal display panel, it includes patterning phase difference glass plate, liquid crystal display and by the patterning phase difference glass
The double-sided adhesive sheet material according to any one of claims 1 to 8 that plate is bonded with the liquid crystal display,
1st adhesive layer is configured in patterning phase difference glass plate side, and the 2nd adhesive layer is configured in institute
State liquid crystal display side.
10. 3D liquid crystal display panel as claimed in claim 9, wherein UV solidify after the 1st adhesive layer and the patterning
180 ° of peel strengths between phase difference glass plate are 400mN/25mm or more, UV solidify after the 1st adhesive layer and institute
Stating 180 ° of peel strengths between transparent film base material is 400mN/25mm or more.
11. the 3D liquid crystal display panel as described in claim 9 or 10, wherein UV solidify after the 2nd adhesive layer and described
180 ° of peel strengths between bright film base material are 50~200mN/25mm, UV solidify after the 2nd adhesive layer and the liquid
180 ° of peel strengths between crystal display are 400mN/25mm or more.
The manufacturing method of 12.3D liquid crystal display panel has used in the manufacturing method according to any one of claims 1 to 8 double
Face adhesive sheet,
The manufacturing method includes following processes:
The double-sided adhesive sheet material is fitted in into patterning phase difference glass plate and liquid crystal display not carry out the cured state of UV
Between device, UV solidification is then carried out.
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| JP2017-109573 | 2017-06-01 | ||
| JP2017109573 | 2017-06-01 | ||
| JP2018-089930 | 2018-05-08 | ||
| JP2018089930A JP6704013B2 (en) | 2017-06-01 | 2018-05-08 | Double-sided adhesive sheet, 3D liquid crystal panel and manufacturing method thereof |
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| CN108977102A true CN108977102A (en) | 2018-12-11 |
| CN108977102B CN108977102B (en) | 2021-03-09 |
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| CN108977102B (en) | 2021-03-09 |
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