CN103842462A

CN103842462A - Adhesive tape

Info

Publication number: CN103842462A
Application number: CN201280048113.8A
Authority: CN
Inventors: 森野彰规; 加藤直树; 矢田真; 里川雄一; 山上晃; 杉浦隆峰; 角木将哉
Original assignee: Dainippon Ink and Chemicals Co Ltd
Current assignee: DIC Corp
Priority date: 2011-09-30
Filing date: 2012-09-28
Publication date: 2014-06-04
Anticipated expiration: 2032-09-28
Also published as: JP5541552B2; JPWO2013047764A1; CN103842462B; KR20140075705A; TW201323567A; WO2013047764A1; TWI627254B; KR101917906B1

Abstract

Provided is an adhesive tape used to secure optical film, wherein an adhesive layer which contacts the optical film comprises a water-dispersible acrylic adhesive composition, the glass transition temperature of the adhesive layer is -5 DEG C or less, and by virtue of the adhesive tape which has a gel fraction of 25 to 45%, even when a water-based adhesive having reduced VOCs is used, members can be properly secured, and distortion of optical films which are readily distorted can be suppressed. The adhesive tape has excellent properties of environmental compatibility and even when the adhesive tape is to be adhered to an optical film, peeling of the adhesive tape due to deformation such as twisting of a housing, or reduced visibility due to distortion of the optical film, can be suppressed, so the adhesive tape is suitable for securing components of an image display device which is to be covered with optical film, in particular, for securing optical film to a transparent panel.

Description

Self adhesive tape

Technical field

The present invention relates to use in the image display device such as liquid-crystal display, organic EL (Electro Luminescence) indicating meter by self adhesive tape fixing blooming.

Background technology

The image display devices such as liquid-crystal display, in the wide spectrum with headed by word processor, Personal Computer, use, especially can in electronic memo, mobile phone, PHS, smart mobile phone, game machine, e-book etc., be used as the display unit of the e-machine of more and more miniaturization.In the image display such as the LCD of these image display devices module, be widely used the formation with the display panel of the fixing backlight module of self adhesive tape and the LCD panel set on surface etc., backlight module with the fixing top layer of display panel, the bloomings such as prismatic lens are set more.

For example, in the liquid-crystal display of side light type backlight mode, generally by stacked to backlight module and LCD panel, in described backlight module, be laminated with reflector, light guiding plate, diffusion sheet etc. and the bloomings such as prismatic lens are set on top layer, and the laminated configuration that lamp reflector is set in the side of light guiding plate there are the light sources such as LED (Light Emitting Diode), cold-cathode tube.Between LCD panel and backlight module, sandwich double-faced adhesive tape (stamping-out becomes architrave shape, its width common about 0.5mm～about 10mm conventionally).Double-faced adhesive tape is only connected to the prismatic lens on backlight module top layer sometimes, sometimes cross-over connection on the prismatic lens on backlight module top layer and the housing of this backlight module of storage, there is the effect that the diffusion sheet set downside at prismatic lens etc. is fixed, also have concurrently and prevent the intrusion of dust or there is resiliency and the effect of breaking of above-mentioned each parts due to preventing from impacting.

And then, in above-mentioned self adhesive tape, in order to interdict the leak light from light source, or in order to effectively utilize light, strongly need to have opacifying property and light reflective concurrently.Such self adhesive tape improves and studies for characteristic always in the past, discloses LCD slim and that have opacifying property and light reflective concurrently self adhesive tape (with reference to patent documentation 1) for module.

But in recent years, in the self adhesive tape using in this position, along with the high performance of middle used e-machine, the especially slimming of mobile phone or multifunction, the problem that was not in the past regarded as problem is appeared in one's mind.As one of this problem, the slimming along with multi-functional mobile phone, although carry out the slimming of internals, due to the slimming of blooming, while being placed under high temperature with the fixing blooming around of double-faced adhesive tape, there is the problem of the deformation of blooming in reliability test.When throwing light on by the local light of deformation like this, the image in LCD panel becomes shortage sharpness.Such problem, occurs especially significantly along with the large screen of the mobile electronic terminal such as intelligent mobile phone or plate terminal.To this, propose to suppress the self adhesive tape of the deformation of blooming, attempt, by fixing well between parts, suppressing the deformation (with reference to patent documentation 2～3) of blooming simultaneously.

On the other hand, from the consideration to environment, in recent years in the periphery material of these image display devices, also wish towards the transformation of the material of reduction VOC (volatile organic compounds), in these e-machine fields, because this requirement is high especially, therefore in the binder layer of self adhesive tape, also expect that from solvent be the conversion of tackiness agent to aqueous adhesive.Therefore, expect to realize can be well will be fixing between parts, and then can suppress aptly the deformation of blooming use the self adhesive tape of aqueous adhesive.In addition, along with the large screen of mobile electronic terminal, in order to suppress peeling off of self adhesive tape due to distortion because of terminal etc., also wish the good stationarity of parts, the raising of especially resistance to repellency.

Patent documentation 1: No. 2004-156015, TOHKEMY

Patent documentation 2: No. 2008-248226, TOHKEMY

Patent documentation 3: No. 2010-168437, TOHKEMY

Summary of the invention

Problem of the present invention is to provide in the self adhesive tape of the fixing blooming that deformation easily occurs, even if use while having reduced the aqueous adhesive of VOC, and also stationary member aptly, and can suppress the self adhesive tape of the deformation of blooming.

In the present invention, by a kind of self adhesive tape, it is fixing for blooming, the binder layer wherein joining with blooming is to be the binder layer that binder composition forms by water-dispersed acrylic, the second-order transition temperature of binder layer is below-5 DEG C, gel fraction is 25～45%, can address the above problem thus.

Self adhesive tape of the present invention, although use the aqueous adhesive layer that has reduced VOC, but as the binder layer of side that is attached at blooming, be-5 DEG C of following and gel fraction is 25～45% binder layers by using second-order transition temperature, can be by fixing well between parts, there is good resistance to repellency, and can suppress aptly the deformation of blooming.Therefore, there is excellent environmental compatibility, simultaneously in the time adhering to object using blooming as quilt, also can suppress the reduction because of the visuognosis due to the deformation of blooming, or peeling off because of the self adhesive tape due to the distortion such as the distortion of housing, therefore be suitable for using blooming as being fixed between the parts of the image display device of adhesion object, particularly blooming and transparent panel is fixing.

Brief description of the drawings

Fig. 1 (a), (b) are the concept maps that represents the measuring method of the deformation preventive of the blooming in embodiment.

Fig. 2 is the concept map that shows the measuring method of the resistance to repellency in embodiment.

Embodiment

Self adhesive tape of the present invention is the fixing self adhesive tape for blooming, and the binder layer joining with blooming is that binder composition is formed by water-dispersed acrylic, and the second-order transition temperature of binder layer is below-5 DEG C, and gel fraction is 25～45%.

[binder layer]

In self adhesive tape of the present invention, be attached at the binder layer of blooming, be to be the binder layer that binder composition forms by be dispersed with the water-dispersed acrylic that acrylic copolymer emulsion particle forms in aqueous medium.In the present invention, become below-5 DEG C by the second-order transition temperature (Tg) that makes this binder layer, preferably become below-10 DEG C, more preferably become below-15 DEG C, thereby can fully guarantee the flexibility of tackiness agent.Thus, even in the time of blooming generation deformation, also can not only follow aptly this deformation but also suppress deformation.Fully wetting by adherend by tackiness agent, can guarantee by the connecting airtight of adherend and tackiness agent, thereby realize suitable resistance to repellency.

Forming the second-order transition temperature of the binder layer of self adhesive tape of the present invention, is the peak temperature of the loss tangent (tan δ) of dynamic viscoelastic wave spectrum.The mensuration of dynamic viscoelastic, for example use test for viscoelastic machine (Rheometrics company system, trade(brand)name: Ares2KFRTNl), test film is sandwiched between the parallel disk of determination part of this trier, with the condition of frequency 1Hz, 2 DEG C/min of heat-up rate, measure from the storage elastic modulus till-50 DEG C～150 DEG C (G ') and loss elastic modulus (G ").Tan δ calculates by following calculating formula.

tanδ=G”／G’

Test film can sandwich the tackiness agent of thickness 0.5～2.5mm between parallel disk individually, also several the duplexer of base material and tackiness agent plies can be sandwiched between parallel disk.And then, even for base material is sandwiched centre by the latter's situation, do not affect the peak temperature of the loss tangent of the dynamic viscoelastic wave spectrum of tackiness agent yet.

The gel fraction of the binder layer of self adhesive tape of the present invention is 25～45%.By above-mentioned second-order transition temperature and make the gel fraction of binder layer become this scope, thereby guarantee to represented the flexibility of sufficient wettability, adhesion by adherend, on the other hand by guaranteeing to tolerate the cohesive force of stress, the deformation of blooming can be suppressed well, and suitable resistance to repellency can be realized.And then this gel fraction is that binder layer was immersed in toluene after 24 hours, measures not solvent components, with the represented gel fraction of quality proportion by subtraction before and after flooding.

Self adhesive tape of the present invention, although have the binder layer of above-mentioned second-order transition temperature and gel fraction, the second-order transition temperature of binder layer can suitably be adjusted by the second-order transition temperature of the second-order transition temperature of the acrylic copolymer used in binder composition, tackifying resin, softening temperature, use level etc.In addition, gel fraction can be by the linking agent, the cross-linked dosage that add in binder composition, and the monomer who imports in the acrylic copolymer reacting with linking agent, monomer measure suitable adjustment.

(acrylic copolymer)

Be binder composition as the water-dispersed acrylic using in binder layer, the composition that can use the emulsion particle that is dispersed with acrylic copolymer in aqueous medium to form.As this acrylic copolymer, be preferably the second-order transition temperature measured taking dynamic viscoelastic wave spectrum as the material of-45 DEG C～-25 DEG C, the material of more preferably-40 DEG C～-30 DEG C.By making the second-order transition temperature of acrylic copolymer become this scope, easily fully guarantee the flexibility of tackiness agent.Thus, even in the time of blooming generation deformation, also easily not only follow aptly this deformation but also can suppress deformation.In addition, fully wetting by tackiness agent to by adherend, and easily guarantee, by the connecting airtight of adherend and tackiness agent, also easily to realize suitable resistance to repellency.

The second-order transition temperature that forms the acrylic copolymer of the binder layer of self adhesive tape of the present invention is the peak temperature of the loss tangent (tan δ) of dynamic viscoelastic wave spectrum.In the mensuration of dynamic viscoelastic, can make the sheet only being formed by acrylic copolymer, similarly measure with above-mentioned binder layer.

As (methyl) acrylate monomer using in acrylic copolymer, (methyl) acrylate monomer can suitable use using in tackiness agent, wherein preferably can use (methyl) acrylate monomer of the alkyl with carbon number 4～8 as main monomer component.As (methyl) acrylate monomer of carbon number 4～8, for example, can use (methyl) acrylate such as (methyl) n-butyl acrylate, (methyl) isobutyl acrylate, (methyl) tert-butyl acrylate, (methyl) 2-EHA, (methyl) Isooctyl acrylate monomer, (methyl) vinylformic acid n-octyl.Wherein, preferably can use n-butyl acrylate and/or 2-EHA, particularly preferably 2-EHA, this is because easily the second-order transition temperature of the binder layer obtaining is controlled to lower second-order transition temperature.In addition, easily improve with the intermiscibility of tackifying resin, with base material, by the raising of the adhesion of adherend also easily acquisition.

There is the content of (methyl) acrylate of the alkyl of carbon number 4～8, be preferably set to 50～98 quality % in the monomer component using in acrylic copolymer, be particularly preferably 80～98 quality %.The content of (methyl) acrylate by making the alkyl with carbon number 4～8 becomes this scope, easily fully guarantees the flexibility of tackiness agent.Thus, even in the time of blooming generation deformation, also easily not only follow aptly this deformation but also suppress deformation.In addition, fully wetting by tackiness agent to by adherend, and easily guarantee, by the connecting airtight of adherend and tackiness agent, also easily to realize suitable resistance to repellency.

In addition, in the time using the 2-EHA that can preferably use especially, more than being preferably made as 40 quality % in the monomer component using in acrylic copolymer, more preferably more than being made as 60 quality %, more than being further preferably made as 80 quality %, more than being further preferably made as 90 quality %.By becoming this scope, easily fully guarantee the flexibility of tackiness agent.Thus, even in the time of blooming generation deformation, also can both follow aptly this deformation, easily suppress again deformation.

In the present invention, as (methyl) acrylate monomer that forms acrylic copolymer, can be also with (methyl) acrylate monomer beyond above-mentioned.As (methyl) acrylate monomer beyond above-mentioned, for example can illustrate (methyl) acrylate monomer such as (methyl) methyl acrylate, (methyl) ethyl propenoate, can and one kind or two or more with in these.Wherein, be preferably and use (methyl) methyl acrylate, (methyl) ethyl propenoate etc. to have (methyl) acrylate of the alkyl of carbon number below 2, usage quantity is preferably 1～10 quality %.

In the present invention, in order to improve in acrylic copolymer emulsion particle, interparticle cohesive force, preferably use carboxylic monomer.As carboxylic monomer, can use one kind or two or more by what select in the carboxylic vinyl monomers such as vinylformic acid, methacrylic acid, Yi Kang acid, toxilic acid, maleic anhydride, phthalic acid, Tetra hydro Phthalic anhydride, β-crotonic acid.Wherein, vinylformic acid, methacrylic acid are easily guaranteed cohesive force by interaction each other of carboxyl, and the linking agent of reaction is many, and it is many to improve the means of cohesive force, have and can represent and the advantage such as the interaction of nitrogenous vinyl monomer described later, thereby preferably.

The content of carboxylic monomer is preferably made as 0.5～10 quality % in the monomer component that forms acrylic copolymer, more preferably 0.5～5 quality %, more preferably 1.5～3.5 quality %.By becoming within the scope of this, be easy to carry out well with the crosslinking reaction of linking agent.And then, easily guarantee to tolerate the cohesive force of stress, can suppress well the deformation of blooming, and easily realize suitable resistance to repellency.

In the present invention, as the monomer component of acrylic copolymer, preferably further use nitrogenous vinyl monomer.Infer nitrogenous vinyl monomer, by with acrylic copolymer emulsion particle in acidic group, particularly with the interaction of carboxyl, produce the effect that the carboxyl that is easy to be orientated is drawn in to inside particles on particle surface.The content of nitrogenous vinyl monomer is 0.1～4.5 quality %, is preferably 0.5～4 quality %, more preferably 0.5～3.5 quality %.

As nitrogenous vinyl monomer, preferably can use the nitrogen containing monomer with amide group.Compared with the nitrogen containing monomer base that is with amine, there is the nitrogen containing monomer of amide group and the interaction of acidic group excessively not strong, can keep aptly cohesive force and interparticle interaction in emulsion particle, due to the cohesive force easily obtaining as tackiness agent, thereby easily obtain suitable binding property and do over again (rework) property.As the nitrogenous monomer with amide group, for example, can use and be selected from one kind or two or more in NVP, N-caprolactam, acryloyl morpholine, vinyl cyanide, acrylamide, N,N-DMAA.

Nitrogenous vinyl monomer in acrylic copolymer and the ratio of vinyl monomer with carboxyl, although there is no particular limitation, but the mole number of the nitrogenous vinyl monomer in the monomer component of formation acrylic copolymer is made as to X, when the mole number of vinyl monomer with carboxyl is made as to Y, mol ratio X/Y is preferably 1/1～1/20, more preferably 1/1～1/5, more preferably 1/1～1/3.If within the scope of this, the vinyl monomer with carboxyl carries out with reacting easily of linking agent described later.

In the acrylic copolymer using in the present invention, also can use as required above-mentioned monomer in addition, as the example of such monomer, in the monomer of hydroxyl, can suitablely use the monomer containing alcohol hydroxyl group such as (methyl) vinylformic acid 2-hydroxy methacrylate, (methyl) vinylformic acid 2-hydroxy propyl ester, (methyl) vinylformic acid 2-hydroxyl butyl ester, (methyl) vinylformic acid 4-hydroxyl butyl ester.As the monomer of ketone group containing or aldehyde radical, can enumerate diacetone acrylamide, two acetone Methacrylamides, propenal, formyl radical vinylbenzene, ethenyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, two acetone acrylate, two acetone methacrylic esters, acetonitrile acrylate, 2-hydroxypropyl acrylate acetylacetic ester, butylene glycol aerylate acetic ester etc.Be monomer as silane, can enumerate 3-methacryloxypropyl methyl dimethoxysilane [for example SHIN-ETSU HANTOTAI's chemistry (strain) KBM-502 processed], 3-methacryloxypropyl trimethoxy silane [for example SHIN-ETSU HANTOTAI's chemistry (strain) KBM-503 processed], 3-methacryloxypropyl methyldiethoxysilane [for example SHIN-ETSU HANTOTAI's chemistry (strain) KBE-502 processed], 3-methacryloxypropyl triethoxyl silane [for example SHIN-ETSU HANTOTAI's chemistry (strain) KBE-503 processed], 3-acryloxy propyl trimethoxy silicane [such as SHIN-ETSU HANTOTAI's chemistry (strain) EBM-5103 processed] etc.In addition, as the monomer containing methylol, can enumerate N hydroxymethyl acrylamide etc.In addition, as the monomer of phosphorous acidic group, for example can enumerate RODIA solar corona (strain) Sipomer PAM-100 processed, PAM-200, PAM-300 etc., can use according to the ratio below 20 quality % in the monomer component of formation acrylic copolymer, can use one kind or two or more.

The weight average molecular weight of the acrylic copolymer using in the present invention is preferably 50～1,200,000, and more preferably 60～1,000,000.By being set as within the scope of this, can improve and represent by the flexibility of the wettability of adherend, adhesion, because the cohesive force that can tolerate stress raises, can suppress well the deformation of blooming, and easily realize suitable resistance to repellency on the other hand.Aforementioned weight average molecular weight converts with polystyrene standard by gel permeation chromatography (GPC).As condition determination, chromatographic column is used TSKgel GMHXL[east Cao's system], column temperature is 40 DEG C, and elutriant is tetrahydrofuran (THF), and flow is 1.0mL/ minute, and polystyrene standard uses TSK polystyrene standard.

In order to adjust molecular weight, in the time of polymerization, also can use chain-transfer agent.As chain-transfer agent, can use known chain-transfer agent, for example lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2 mercapto ethanol, Thiovanic acid, 2-ethylhexyl mercaptoacetate, 2,3-dimethyl sulfydryl-1-propyl alcohol.

(tackifying resin)

The water-dispersed acrylic that used is in the present invention in binder composition, and in order to represent by abundant wettability, the adhesion of adherend, raising can tolerate the cohesive force of stress, preferably uses tackifying resin.The second-order transition temperature of this tackifying resin is preferably 30～120 DEG C, more preferably 40～100 DEG C, more preferably 45～80 DEG C, is particularly preferably 50～60 DEG C.By fusion second-order transition temperature, than also high tackifying resin of acrylic copolymer, strong binding property is improved.

Form the second-order transition temperature of the tackifying resin using in the tackiness agent of self adhesive tape of the present invention, that JISK7121 specifies the temperature as intermediate point second-order transition temperature in the stepped changing unit of the glass transition of the DSC curve that uses DSC determinator to measure.As concrete measuring method, for example, the DSC curve that will use DSC determinator (Mettler-Toledo (strain) system, trade(brand)name: DSC822) to measure, with the value that uses the attached software of this device to resolve.Sample uses vacuum drier, under vacuum, dry more than 2 days at 60 DEG C.The scope of-50 DEG C to 200 DEG C, with the heat-up rate METHOD FOR CONTINUOUS DETERMINATION of 2 DEG C/min 2 times, resolve the determination data of the 2nd time, calculate second-order transition temperature.

As the tackifying resin using in the present invention, from being used in the viewpoint of binder composition of aqueous dispersion type, preferably can use the tackifying resin of emulsion-type.As the tackifying resin of this emulsion-type, can illustrate rosin series, polymerized rosin system, polymerized rosin ester system, rosin phenol system, stabilization rosin ester system, nilox resin ester system, terpene system, terpene phenol system, petroleum resin system etc.

Wherein, preferably using polymerized rosin ester is that tackifying resin and/or rosin phenol are tackifying resin.Particularly, polymerized rosin ester is that tackifying resin can be enumerated the waste river chemical industry of SuperEster E-650[(strain) system], the waste river chemical industry of SuperEster E-788[(strain) system], the waste river chemical industry of SuperEster E-786-60[(strain) system], the waste river chemical industry of SuperEster E-865[(strain) system], the waste river chemical industry of SuperEster E-865NT[(strain) system], Hariester SK-508[HARIMA changes into (strain) system], Hariester SK-508H[HARIMA changes into (strain) system], Hariester SK-816E[HARIMA changes into (strain) system], Hariester SK-822E[HARIMA changes into (strain) system], Hariester SE-323NS[HARIMA changes into (strain) system] etc., rosin ester is that tackifying resin can be enumerated the waste river chemical industry of SuperEster NS-125A[(strain) system], the waste river chemical industry of SuperEster NS-100H[(strain) system], Hariester SK-90D-55[HARIMA changes into (strain) system], Hariester SK-385NS[HARIMA changes into (strain) system] etc., modified rosin ester be tackifying resin can enumerate Hariester SK-501NS[HARIMA change into (strain) system], Hariester SK-370N[HARIMA changes into (strain) system] etc., rosin series tackifying resin can be enumerated the waste river chemical industry of SuperEster NS-120B[(strain) system], the waste river chemical industry of SuperEster NS-100A[(strain) system] etc., rosin phenol is that tackifying resin can be enumerated the waste river chemical industry of Tamanol E-100[(strain) system], the waste river chemical industry of Tamanol E-200[(strain) system], the waste river chemical industry of Tamanol E-200NT[(strain) system] etc.

The proportioning of acrylic copolymer/tackifying resin, in the ratio of mass parts, acrylic copolymer/tackifying resin=100/10～100/40 is suitable, further preferred acrylic copolymer/tackifying resin=100/15～100/35.If within the scope of this, can balance improve well by the cohesive force that represents, can tolerate stress of the abundant wettability of adherend, adhesion.

(linking agent)

The water-dispersed acrylic that used is in the present invention in binder composition, in order to improve the cohesive force of binder layer of gained, preferably uses linking agent.As linking agent, can use well-known isocyanate-based linking agent, epoxy is that linking agent, ethylenimine are that linking agent, polyvalent metal salt are that linking agent, metal chelating syzygy linking agent, keto acyl hydrazine are that linking agent, oxazoline are that linking agent, carbodiimide are that linking agent, silane are that linking agent, glycidyl (alkoxyl group) epoxy silane are linking agent etc.Wherein, preferably after polymerization finishes, add, impel the linking agent of the crosslinked type reacting.For example, can enumerate isocyanate-based linking agent, epoxy is that linking agent, oxazoline is that linking agent, carbodiimide are that linking agent, glycidyl (alkoxyl group) epoxy silane are linking agent etc.Particularly, for isocyanate-based linking agent, can enumerate Burnock DNW-5000[DIC (strain) system], Burnock DNW-5010[DIC (strain) system], Burnock DNW-5100[DIC (strain) system], Burnock DNW-5500[DIC (strain) system], Aquanate100[Japanese polyurethane industry (strain) system], Aquanate105[Japanese polyurethane industry (strain) system], Aquanate110[Japanese polyurethane industry (strain) system], Aquanate120[Japanese polyurethane industry (strain) system], Aquanate130[Japanese polyurethane industry (strain) system], Aquanate200[Japanese polyurethane industry (strain) system], Aquanate210[Japanese polyurethane industry (strain) system], LS2319[firmly changes BAYER Urethane (strain) system], LS2336[firmly changes BAYER Urethane (strain) system], Bayhydur3100[firmly changes BAYER Urethane (strain) system] etc., be linking agent for epoxy, can enumerate Denacol EX-832[NAGASE and change into industry (strain) system], Denacol EX-841[NAGASE changes into industry (strain) system], TetradC[Mitsubishi gas chemistry (strain) system], TetradX[Mitsubishi gas chemistry (strain) system] etc., Dui Yu oxazoline is linking agent, can enumerate Epocros WS-500[(strain) Japanese catalyst system], Epocros WS-700[(strain) Japanese catalyst system], Epocros K-2010E[(strain) Japanese catalyst system], Epocros K-2020E[(strain) Japanese catalyst system], Epocros K-2030E[(strain) Japanese catalyst system], be linking agent for carbodiimide, can enumerate Carbodilite SV-02[Nisshinbo achievement (strain)], Carbodilite V-02[Nisshinbo achievement (strain)], Carbodilite V-02-L2[Nisshinbo achievement (strain)], Carbodilite V-04[Nisshinbo achievement (strain)], Carbodilite E-01[Nisshinbo achievement (strain)], Carbodilite E-02[Nisshinbo achievement (strain)], Carbodilite E-03A[Nisshinbo achievement (strain)], Carbodilite E-04[Nisshinbo achievement (strain)], be linking agent for glycidyl (alkoxyl group) epoxy silane, can enumerate 2-(3,4-epoxy group(ing) cyclohexyl ethyl trimethoxy silane [KBM-303, SHIN-ETSU HANTOTAI's organosilicon (strain) system], γ-glycidoxypropyltrime,hoxysilane [KBM-403, SHIN-ETSU HANTOTAI's organosilicon (strain) system], γ-glycidoxy propyl group methyldiethoxysilane [KBE-402, SHIN-ETSU HANTOTAI's organosilicon (strain) system], γ-glycidoxy propyl-triethoxysilicane [KBE-403, SHIN-ETSU HANTOTAI's organosilicon (strain) system] etc.

Wherein, preferably use the linking agent reacting with the vinyl monomer with acidic group, preferably above-mentioned isocyanate-based linking agent, epoxy compounds, oxazoline compound, carbodiimide is linking agent, glycidyl (alkoxyl group) epoxy radicals silicone hydride compound etc.By using the linking agent of these and acid-base reaction, can represent aptly the raising of cohesive force.

(additive)

The water-dispersed acrylic that used is in the present invention in binder composition, as additive, not hindering in the scope of desired effect of the present invention, the known additives such as the tinting materials such as weighting agent, pigment, dyestuff, pH adjusting agent, tunicle formation auxiliary, flow agent, tackifier, hydrophobizing agent, defoamer such as adjusting alkali (ammoniacal liquor etc.) that pH use or acid, softening agent, tenderizer, antioxidant, glass or plastic fiber, balloon, pearl, metal-powder at random can be added in binder composition as required.

The thickness of binder layer is preferably 5～50 μ m, more preferably 10～30 μ m.If more than 5 μ m, can obtain sufficient binding property, and by being made as below 50 μ m, the display unit developing applicable to compactization of forward etc.

[supporting mass]

The supporting mass using in the present invention has no particular limits, the various supporting masses that use can use image display device surrounding member fixing time.As this supporting mass, for example, can be the supporting mass being formed by resin molding, or on resin molding, be provided with the supporting mass of pigmented layer.Fixing of blooming and other member, especially when blooming and transparent panel fixing, owing to requiring shading performance or light reflective properties, therefore, in the time realizing good shading performance or light reflective properties, preferably can use the supporting mass that is provided with pigmented layer on resin molding more.

As the resin molding using in supporting mass, can use known usual resin molding, for example can enumerate cellulose film, polyethylene, polypropylene, nylon, polystyrene, polyimide, polyester etc.Wherein, polyester, due to intensity or insulativity excellence, can preferably use.In addition, polyethylene terephthalate, owing to being that the adhesion of black liquid layer of resin is also good with using polyurethane(s), can preferably use.

As the thickness of resin molding that becomes supporting mass, be preferably 6～100 μ m.Thickness is 6 μ m when above, and the fracture of film easily occurs in the time peeling off, when 100 μ m are following, easily peeling off when by the attaching of adherend.More preferably 12～50 μ m.

In addition, also resin molding itself can be colored as to white or black, if resin molding has the white resin film of light reflective, in the time of the image displaying part for image display device, owing to can improving brightness that image shows preferably.Wherein, there is the white polyethylene terephthalate of insulativity light diffused reflection the most preferred.In addition, if resin molding has the black resin film of opacifying property, due to the contrast gradient of raising image display device preferably.Wherein, the polyethylene terephthalate of black owing to can giving excellent opacifying property preferably.

While pigmented layer being set on these resin moldings, preferably use painted black liquid.For the painted black liquid of this pigmented layer, the photo-shield strip or the luminous reflectance band that use in can the fixing use of suitable use image display device surrounding member are waited the painted black liquid using in colour band.Wherein, the content of halogen of pigmented layer is below 0.3 quality %, is preferably below 0.05 quality %, is particularly preferably the black liquid that does not contain in fact halogen.The pigmented layer of such reduction content of halogen uses and does not adopt resin that vinyl chloride-based resin etc. contains halogen, the sulphur painted black liquid as resin glue, therefore particularly owing to being difficult to obtain the anchoring of binder layer and the bounding force of binder layer is difficult to obtain doing over again property while uprising, but the above-mentioned binder layer using in the present invention, even if be the pigmented layer that this content of halogen is low, also can realize suitable binding property and doing over again property.Herein, content of halogen is the detection limit during with x-ray fluorescence analysis.As the analytical equipment of fluorescent X-ray, for example, can enumerate Rigaku company system " ZSX Primus ", " ZSXPrimus II " etc.

As the painted black liquid that has reduced content of halogen, preferably can use and not adopt resin that vinyl chloride-based resin etc. contains halogen, the sulphur painted black liquid as resin glue.As such resin glue, for example, can use polyurethane resin, vibrin, polyamide resin, acrylic resin, Nitrocellulose etc.Wherein, from the adhesion of binder layer and with the viewpoint of the adhesion of the resin molding of stacked pigmented layer, preferably can use polyurethane resin, particularly preferably can use polyester urethane resin.

While using polyester urethane resin as resin glue, the second-order transition temperature of this polyester urethane resin is preferably-30 DEG C～30 DEG C, more preferably-20 DEG C～30 DEG C, more preferably-15 DEG C～25 DEG C, be particularly preferably-10 DEG C～25 DEG C.The peak temperature of the tan δ of polyester urethane resin is in the time of this scope, because pigmented layer has suitable flexibility and hardness, in the time doing over again, be difficult for especially occurring because of the crackle of pigmented layer produce cause disconnected fall, and black liquid while being difficult for occurring because of high temperature flow and cause peel off.

It should be noted that, the second-order transition temperature of polyester urethane resin, using the peak temperature of the tan δ of the following dynamic viscoelastic wave spectrum at frequency 1Hz of being measured as second-order transition temperature.

Be coated with machine by rod, with the thickness of 50 μ m by polyester urethane resin masking.Then, use test for viscoelastic machine, test film (the long 20mm of sample of specimen length 20mm will be cut into, thickness 50 μ), under frequency 1Hz, the condition of 3 DEG C/1 minute heating-up time, measure storage elastic modulus till from-150 DEG C to 250 DEG C (G ') and loss elastic modulus (G ").Loss tangent tan δ calculates by following calculating formula.

Loss tangent tan δ=G "/G '

As test for viscoelastic machine, for example, can enumerate the DMS210 processed of Seiko instrument company, DMS220, DMS6100 etc.

In the painted black liquid using, contain the solidifying agent using in common black liquid in pigmented layer, but as this solidifying agent, also preferably containing aliphatics or alicyclic isocyanate is solidifying agent.Be that aliphatics or the alicyclic isocyanate that the polyester urethane participant of-30 DEG C～30 DEG C forms soft crosslinking structure is cross-linked by making second-order transition temperature, easily control Young's modulus, easily suppress the mobile black liquid interface of causing of black liquid and the peeling off of adhesive interface of Yin Gaowen.Owing to easily becoming more suitably Young's modulus, in the time doing over again, be difficult for cracking at black liquid layer, easily obtain be difficult for occur self adhesive tape disconnected fall effect.

As aliphatics or alicyclic isocyanate, can use hexamethylene diisocyanate, dicyclohexyl methane diisocyanate, isophorone diisocyanate, tri-methyl hexamethylene isocyanic ester, 1,6,11-undecane triisocyanate, lysinediisocyanate, Methionin ester triisocyanate, 1,8-vulcabond-4-isocyanic ester methyloctane, 1,3,6-hexa-methylene triisocyanate, norbornane triisocyanate.In addition, preferably can use the trimer of these isocyanic ester, wherein preferably vulcabond add adult or biuret body or urate body.Wherein, the add adult or biuret body or urate body of hexamethylene diisocyanate or isophorone diisocyanate are easily controlled Young's modulus, thereby preferably, particularly preferably biuret or urate body.Solidifying agent can add separately, more than also can adding 2 kinds.

As for painted black liquid is given to painted tinting material, can use known usual pigment or the dyestuff that do not contain halogen, from weathering resistance, thermotolerance, dispersiveness black liquid resin, preferably, when black, be carbon black, when white, be titanium oxide, calcium carbonate, barium sulfate, when yellow, being Zh 1, is red iron oxide when red, when blue, is phthalocyanine blue, when silver color, being aluminium powder, is mica titanium valve when pearl.During using pigmented layer as light shield layer, be preferably formed black ink liquid layer, carbon black is because opacifying property is excellent and preferred.In addition, during using pigmented layer as reflection layer, preferably can form the layer of white ink liquid layer, preferably can use titanium oxide.

As the addition of tinting material, can carry out suitable adjustment according to purposes etc., be preferably made as containing 10～70% in the black liquid solids component of tinting material more preferably 40～50%.If more than 10%, show aptly opacifying property, if below 70%, disperse to become good.

The thickness of pigmented layer can carry out suitable adjustment according to desired characteristic.For example, during using pigmented layer as light shield layer, the viewpoint of the processibility during from opacifying property and self adhesive tape stamping-out, is preferably 1～10 μ m, more preferably 3～7 μ m.And then from the viewpoint of doing over again property, the thickness of black liquid is thicker, more preferred black liquid layer is low elastic modulus.

In addition, pigmented layer can be individual layer, according to desired disguise or light reflective, opacifying property, and also can be stacked more than 2 layers.Especially, during using pigmented layer as light shield layer, in order to seek the rising of opacifying property, prevent the leakage because of the light due to pin hole, be preferably 2 layers of above pigmented layer are set.

Using colour band of the present invention in the situation of photo-shield strip or the shading zone of reflections, supporting mass is irradiated to 10000cd/m ²the light transmission capacity of light time be preferably 1cd/m ²below, 0.1cd/m more preferably ²below.

[self adhesive tape]

Self adhesive tape of the present invention is the self adhesive tape of fixed optics film, for being provided with and will being attached at the self adhesive tape of above-mentioned binder layer of blooming at least one side of supporting mass.By this formation, can both there is the environmental compatibility excellent because of the reduction of VOC, can fix aptly again the blooming that deformation easily occurs, there is good resistance to repellency, can suppress aptly the deformation of blooming simultaneously.

The form of self adhesive tape, can be the one side self adhesive tape that is provided with binder layer in the one side of supporting mass, also can be the double-faced adhesive tape that is provided with binder layer on the two sides of supporting mass, but while fixing, be preferably double-faced adhesive tape between fixed optics film and the such parts of other member.To be attached at the binder layer of above-mentioned blooming, from for various by adherend, especially the transparent panel such as face glass also has suitable fusible viewpoint and sets out, and in the time becoming double-faced adhesive tape, is preferably all identical binder layer in two sides.In addition, each binder layer can be the layer of the tackiness agent of individual layer, also can be the layer that is laminated with multiple binder layers, also form stacked multiple self adhesive tapes can be used.And then, while using one side self adhesive tape to fix, the method for double-faced adhesive tape is set on the surface based on not thering is binder layer in addition between parts, or the method for coating adhesive, also applicable to fixing between parts.

Binder layer can be by self adhesive tape coating time normally used method, can be formed on resin molding or light shield layer.Particularly, for example, can, by being directly coated on supporting mass forming the composition of binder layer, carry out dry method, or temporarily be coated in mold release film, after being dried, then fitting in method on supporting mass etc. and form.

The thickness of self adhesive tape of the present invention is preferably 20～100 μ m, more preferably 30～75 μ m.Wherein, be particularly preferably 40～65 μ m.Thickness is the self adhesive tape of this scope, is suitable for the fixing use of parts as image display device, is particularly suited for the device used for image display of miniature electric machine.

The 180 degree peel adhesion for blooming and glass of self adhesive tape of the present invention, are preferably 7～15N/20mm, more preferably 8～13N/20mm.Bounding force is the self adhesive tape of this scope, and in the time that the parts of image display device are fixed, parts are fixed aptly.

Self adhesive tape of the present invention, even to be with entirety, also preferably the content of halogen (chlorine, bromine, fluorine, iodine) is below 0.3 quality %, more preferably, below 0.05 quality %, is particularly preferably and does not contain in fact halogen.Reduced the self adhesive tape of halogen, be suitable in the inhibition of the mistake start of image display device.

In the embodiment of self adhesive tape of the present invention, as the binder layer that is at least attached at blooming, as long as above-mentioned binder layer is arranged on the formation on supporting mass, particularly preferably can use in the painted aspect of supporting mass with pigmented layer, have and will be attached at the formation of binder layer of blooming.As preferred concrete example, the one side that can be illustrated in resin molding has supporting mass two-sided of pigmented layer, has the form of binder layer, has supporting mass two-sided of pigmented layer on the two sides of resin molding, has the form of binder layer etc.In these forms, if pigmented layer becomes the light shield layer being become by black ink liquid, can be used as photo-shield strip, if become the reflection layer being become by white ink liquid, can be used as luminous reflectance band.In addition, capable of being combined both and use, can be maybe that adopted resin molding uses light reflective white films or opacifying property black film, the reflection layer that the light shield layer that these are become with black ink liquid or white ink liquid form combines, and makes the form of the shading zone of reflections.

[purposes]

Double-faced adhesive tape of the present invention is fixed with other member for fixing, the blooming of blooming, will be that the binder layer that binder composition forms is attached at blooming and uses by above-mentioned water-dispersed acrylic.Self adhesive tape of the present invention has by the suitable bounding force of adherend, after blooming and other member is fixing, even in the time that blooming deforms, also can suppress the deformation of blooming, be therefore preferably suitable for the fixing image display device of requirement blooming and other member.In addition, have good binding property, resistance to repellency is especially excellent.Therefore, deformation at blooming easily occurs, because the distortion such as the distortion of housing easily occur in the fixed-purpose of blooming of the image display device peeling off of self adhesive tape, can use aptly parts fixing strip used when the especially suitable blooming as implement the fixing slim image display device of parts in save space mode is fixing.In addition, also can be aptly as requiring suitable shading reflecting properties, and when bad or require the blooming of image display device of fixing thin type of doing over again property and the photo-shield strip of transparent panel, luminous reflectance band, the shading zone of reflections while repairing.

As blooming, can enumerate prismatic lens, diffusion barrier, photomask, reflectance coating etc.Wherein, as the blooming that deformation especially easily occurs, can enumerate the prismatic lens that is provided with layers of prisms on the film with reflection of polarization function.As such blooming, for example, can enumerate the BEF-RP2RC processed of 3M company, BEF-RP3.

Double-faced adhesive tape of the present invention can suppress the deformation of blooming aptly, is especially the big or small blooming of 2.5～7 inches (diagonal angle) left and right for the size of blooming, can realize especially suitable deformation inhibition.

Its profile variation rate of blooming is larger, and deformation more easily occurs, and in the time that movement in flow direction and width changes, deformation is serious.In flow direction or width, be greater than ± 0.05% velocity of variation, especially in flow direction, be greater than+0.06% velocity of variation, be greater than-0.06% velocity of variation in width time, deformation especially easily occurs.Utilize self adhesive tape of the present invention, even if be above-mentioned blooming, also can suppress deformation.And then the profile variation rate of blooming is with represented at the following formula of 85 DEG C of front and back of standing 5 minutes.

Profile variation rate=[(length after leaving standstill-length before leaving standstill)/(length before leaving standstill)] × 100 (%)

When blooming has layers of prisms, when the crest line of layers of prisms tilts to intersect with the flow direction of self adhesive tape, the deformation of blooming easily occurs, even but self adhesive tape of the present invention is above-mentioned formation, also can suppress aptly deformation.

Other member of fixing with blooming as passing through double-faced adhesive tape of the present invention, can be the various members of fixing with blooming in image display device, for example, can enumerate the display panel such as liquid crystal (LCD) panel, electroluminescence panel, plasma display device, electronic paper display panel on the top layer of being located at image display device.These display panels can use separately glass or plastics, or the laminating functional membrane such as polarizing coating and using.In double-faced adhesive tape of the present invention, when all becoming, two sides use above-mentioned water-dispersed acrylic while being the binder layer of binder composition, and excellent especially with the binding property of face glass or polarizing coating.

As the solid form of blooming and other member, as long as guaranteeing the form of image display area of image display device, have no particular limits, preferably can illustrate the form that double-faced adhesive tape by become architrave shape through stamping-out etc. fixes square blooming one other member, fix the form of end peripheral more than two limits of square blooming by rectangular double-faced adhesive tape, with gap arbitrarily, in the end peripheral of square blooming, the form fixing by scutellate double-faced adhesive tape etc.

As an example of image display device, there is the LCD of mode backlight etc., as the formation of its general formation backlight module that has been sequentially stacked and display panel (LCD panel), in described backlight module, stacked reflector, light guiding plate, diffusion sheet etc., the bloomings such as prismatic lens are set on top layer, in the side of light guiding plate, lamp reflector are set, dispose the light sources such as LED (Light Emitting Diode), cold-cathode tube.Self adhesive tape of the present invention, as preferred form, can illustrate stamping-out and become architrave shape and sandwich the form between display panel and the blooming on backlight module top layer.The blooming side binder layer that the attaching form of double-faced adhesive tape can be double-faced adhesive tape only contacts the form of the blooming on backlight module top layer, also can be in the blooming on backlight module top layer and the form that is accommodated with cross-over connection on the housing of this backlight module.

Face glass blooming of the present invention is fixing with double-faced adhesive tape, owing to can suppressing the mistake start of periphery machine, give the goods that reliability is high, therefore can be used as suitably various e-machines, especially the face glass of the display unit of the mobile electron machine of the miniaturization such as electronic memo, mobile phone, intelligent mobile phone (high functional mobile phone), PHS, game machine, e-book, Multifunctional data terminal, mobile personal computer is fixing uses.

Embodiment

[Production Example of polyester urethane]

(polyester urethane resin (A))

Possessing in the four-hole boiling flask of stirrer, thermometer, reflux cooler and nitrogen ingress pipe, add the sour composition by hexanodioic acid/terephthalic acid=50/50 and the 3-methyl isophthalic acid of 256.3 parts, the number-average molecular weight (hereinafter referred to as Mn) 2 of 5-pentanediol gained, the isophorone diisocyanate of 000 polyester glycol and 36.5 parts makes its reaction 15 hours at 90 DEG C under nitrogen gas stream.Then, add the isophorone diamine of 5.0 parts, the Di-n-Butyl Amine of 2.2 parts, the toluene of 175 parts, the methyl ethyl ketone of 350 parts, the isopropyl enol of 175 parts, under agitation make its reaction 3 hours at 40 DEG C, thereby obtain the polyester urethane resin (A) of resin solid constituent concentration 30.0%, gardner viscosity U-V (25 DEG C), amine value=0, matter average molecular weight (hereinafter referred to as Mw) 67,000.The peak temperature of the tan δ of the resin of gained is-8 DEG C.

[Production Example of black ink liquid]

(Production Example 1 of black ink liquid)

Add the DEGUSSA company system " Carbon Degussa Special4A " of 4 parts, the DEGUSSA company system " Carbon Special250P " of 6 parts, the polyester urethane resin (A) (tan δ peak temperature=-8 DEG C) of 40 parts, the methyl ethyl ketone of 23 parts, the toluene of 13 parts, the vinyl acetic monomer of 6 parts, the n-propyl acetate of 3 parts, the Virahol of 3 parts, in the material that disperses to form through approximately 1 hour wet type of sand mill, add the DIC company solidifying agent processed " KR90 " (the biuret body of hexamethylene diisocyanate) of 4 parts, the DIC company thinner processed " Direuser V No.20 " of 35 parts, make black ink liquid (A).And then resin represents solids component ratio.

[making of supporting mass]

(black liquid coat film (A))

To Supreme Being people's Du Pont membrane (strain) Teflex FW2#13 processed (thickness: 13 μ m, tensile strength 23N/20mm), the mode becoming more than 50 dyne with condition of surface is carried out corona treatment, become the mode of 4 μ m thereon with dry thickness, intaglio plate painting black China ink liquid (A) 2 times.And then dry is to place 2 minutes at normal temperature.Then 40 DEG C of slakings 2 days, obtain black liquid coat film (A).

[modulator approach of acrylic copolymer emulsion]

(modulation example 1)

The modulation > of < emulsion (1)

In container, drop into the ion exchanged water of 75.0g, the industrial pharmacy of surfactant A qualon KH-1025[first (strain) system of 20.0g; Effective constituent 25%] make with the tensio-active agent Latemul PD-104[flower king (strain) of 37.5g; Effective constituent 20%], uniform dissolution.Therein, add the n-butyl acrylate of 227.5g, the 2-EHA of 227.5g, the methyl methacrylate of 25.0g, the NVP of 7.5g, the vinylformic acid of 1.5g, the methacrylic acid of 11.0g, the lauryl mercaptan of 0.2g, carry out emulsification, obtain the emulsion (1) of 632.7g.

The modulation > of the emulsion of < acrylic copolymer (1)

Possessing in the reaction vessel of stirrer, reflux cooling pipe, nitrogen ingress pipe, thermometer, dropping funnel, drop into the ion exchanged water of 340g, limit is blown into nitrogen limit and is warming up to till 60 DEG C.Under agitation, add a part [3.2g], the ammonium persulfate aqueous solution [effective constituent 3%] of 5.0g, the aqueous solution of sodium bisulfite [effective constituent 3%] of 5.0g for emulsion (1), limit keeps 60 DEG C of limits within 1 hour, to make its polymerization.Next, the ammonium persulfate aqueous solution [effective constituent 1.25%] by the remaining emulsion (1) of 629.5g with 40g, uses funnel separately, and reaction vessel is remained on the dropping polymerization of 8 hours 60 DEG C of limit used times by limit.After dropping finishes, limit remains on 60 DEG C of limits by reaction vessel and stirs 2 hours, and then cooling content, then becomes 7.5 mode with pH, modulates with ammoniacal liquor (effective constituent 10%).It is filtered with 200 order wire nettings, thereby obtain the emulsion of the acrylic copolymer (1) of 1013.5g.Herein, in the emulsion of the acrylic copolymer of gained (1), solid component concentration 50%, median size is 341nm.

(modulation example 2)

The modulation > of < emulsion (2)

In container, drop into the ion exchanged water of 75.0g, the industrial pharmacy of surfactant A qualon KH-1025[first (strain) system of 20.0g; Effective constituent 25%] make with the tensio-active agent Latemul PD-104[flower king (strain) of 37.5g; Effective constituent 20%], uniform dissolution.Therein, add the n-butyl acrylate of 227.5g, the 2-EHA of 227.5g, the methyl methacrylate of 25.0g, the NVP of 7.5g, the vinylformic acid of 12.5g, the lauryl mercaptan of 0.20g, carry out emulsification, thereby obtain the emulsion (2) of 632.7g.

The modulation > of the emulsion of < acrylic copolymer (2)

Possessing in the reaction vessel of stirrer, reflux cooling pipe, nitrogen ingress pipe, thermometer, dropping funnel, drop into the ion exchanged water of 340g, limit is blown into nitrogen limit and is warming up to till 60 DEG C.Under agitation, add a part [3.2g], the ammonium persulfate aqueous solution [effective constituent 3%] of 5.0g, the aqueous solution of sodium bisulfite [effective constituent 3%] of 5.0g for emulsion (2), limit keeps 60 DEG C of limits within 1 hour, to make its polymerization.Next, the ammonium persulfate aqueous solution [effective constituent 1.25%] by the remaining emulsion (2) of 629.5g with 40g, uses funnel separately, and reaction vessel is remained on the dropping polymerization of 8 hours 60 DEG C of limit used times by limit.After dropping finishes, limit remains on 60 DEG C of limits by reaction vessel and stirs after 2 hours, and cooling content, then becomes 7.5 mode with pH, modulates with ammoniacal liquor (effective constituent 10%).It is filtered with 200 order wire nettings, thereby obtain the emulsion of the acrylic copolymer (2) of 1013.5g.Herein, in the emulsion of the acrylic copolymer of gained (2), solid component concentration 50%, median size is 338nm.

(modulation example 3)

The modulation > of < emulsion (3)

In container, drop into the ion exchanged water of 75.0g, the industrial pharmacy of surfactant A qualon KH-1025[first (strain) system of 20.0g; Effective constituent 25%] make with the tensio-active agent Latemul PD-104[flower king (strain) of 37.5g; Effective constituent 20%], uniform dissolution.Therein, add the n-butyl acrylate of 50.0g, the 2-EHA of 405.0g, the methyl methacrylate of 25.0g, the NVP of 7.5g, the vinylformic acid of 12.5g, the lauryl mercaptan of 0.20g, carry out emulsification, thereby obtain the emulsion (3) of 632.7g.

The modulation > of the emulsion of < acrylic copolymer (3)

Possessing in the reaction vessel of stirrer, reflux cooling pipe, nitrogen ingress pipe, thermometer, dropping funnel, drop into the ion exchanged water of 340g, limit is blown into nitrogen limit and is warming up to till 60 DEG C.Under agitation, add a part [3.2g], the ammonium persulfate aqueous solution [effective constituent 3%] of 5.0g, the aqueous solution of sodium bisulfite [effective constituent 3%] of 5.0g for emulsion (3), limit keeps 60 DEG C of limits within 1 hour, to make its polymerization.Next, the ammonium persulfate aqueous solution [effective constituent 1.25%] by the remaining emulsion (1) of 629.5g with 40g, uses funnel separately, and reaction vessel is remained on the dropping polymerization of 8 hours 60 DEG C of limit used times by limit.After dropping finishes, limit remains on 60 DEG C of limits by reaction vessel and stirs after 2 hours, and cooling content, then becomes 7.5 mode with pH, modulates with ammoniacal liquor (effective constituent 10%).It is filtered with 200 order wire nettings, thereby obtain the emulsion of the acrylic copolymer (3) of 1013.5g.Herein, in the emulsion of the acrylic copolymer of gained (3), solid component concentration 50%, median size is 330nm.

(adjusting example 4)

The modulation > of < emulsion (4)

In container, drop into the ion exchanged water of 75.0g, the industrial pharmacy of surfactant A qualon KH-1025[first (strain) system of 20.0g; Effective constituent 25%] spend king's (strain) effective constituent 20% processed with the tensio-active agent Latemul PD-104[of 37.5g], uniform dissolution.Therein, add the n-butyl acrylate of 231.25g, the 2-EHA of 231.25g, the methyl methacrylate of 25.0g, the vinylformic acid of 1.5g, the methacrylic acid of 11.0g, the lauryl mercaptan of 0.2g, carry out emulsification, thereby obtain the emulsion (4) of 632.7g.

The modulation > of the emulsion of < acrylic copolymer (4)

Possessing in the reaction vessel of stirrer, reflux cooling pipe, nitrogen ingress pipe, thermometer, dropping funnel, drop into the ion exchanged water of 340g, limit is blown into nitrogen limit and is warming up to till 60 DEG C.Under agitation, add a part [3.2g], the ammonium persulfate aqueous solution [effective constituent 3%] of 5.0g, the aqueous solution of sodium bisulfite [effective constituent 3%] of 5.0g for emulsion (4), limit keeps 60 DEG C of limits within 1 hour, to make its polymerization.Next, the ammonium persulfate aqueous solution [effective constituent 1.25%] by the remaining emulsion (2) of 629.5g with 40g, uses funnel separately, and reaction vessel is remained on the dropping polymerization of 8 hours 60 DEG C of limit used times by limit.After dropping finishes, limit remains on 60 DEG C of limits by reaction vessel and stirs after 2 hours, and cooling content, then becomes 7.5 mode with pH, modulates with ammoniacal liquor (effective constituent 10%).It is filtered with 200 order wire nettings, thereby obtain the emulsion of the acrylic copolymer (4) of 1013.5g.Herein, in the emulsion of the acrylic copolymer of gained (4), solid component concentration 50%, median size is 345nm.

(adjusting example 5)

The modulation > of < emulsion (5)

In container, drop into the ion exchanged water of 75.0g, the industrial pharmacy of surfactant A qualon KH-1025[first (strain) system of 20.0g; Effective constituent 25%] make with the tensio-active agent Latemul PD-104[flower king (strain) of 37.5g; Effective constituent 20%], uniform dissolution.Therein, add the n-butyl acrylate of 240g, the 2-EHA of 240g, the NVP of 7.5g, the vinylformic acid of 1.5g, the methacrylic acid of 11.0g, the lauryl mercaptan of 0.2g, carry out emulsification, thereby obtain the emulsion (5) of 632.7g.

The modulation > of the emulsion of < acrylic copolymer (4)

Possessing in the reaction vessel of stirrer, reflux cooling pipe, nitrogen ingress pipe, thermometer, dropping funnel, drop into the ion exchanged water of 340g, limit is blown into nitrogen limit and is warming up to till 60 DEG C.Under agitation, add a part [3.2g], the ammonium persulfate aqueous solution [effective constituent 3%] of 5.0g, the aqueous solution of sodium bisulfite [effective constituent 3%] of 5.0g for emulsion (5), limit keeps 60 DEG C of limits within 1 hour, to make its polymerization.Next, the ammonium persulfate aqueous solution [effective constituent 1.25%] by the remaining emulsion (2) of 629.5g with 40g, uses funnel separately, and reaction vessel is remained on the dropping polymerization of 8 hours 60 DEG C of limit used times by limit.After dropping finishes, limit remains on 60 DEG C of limits by reaction vessel and stirs after 2 hours, and cooling content, then becomes 7.5 mode with pH, modulates with ammoniacal liquor (effective constituent 10%).It is filtered with 200 order wire nettings, thereby obtain the emulsion of the acrylic copolymer (5) of 1013.5g.Herein, in the emulsion of the acrylic copolymer of gained (5), solid component concentration 50%, median size is 340nm.

[water-dispersed acrylic is the manufacture of binder composition]

(Production Example 1)

At the emulsion 1000g[dry of aforesaid acrylic copolymer (1); 500g] in, the system of the Surfynol PSA-336[Air Products Japan (strain) as flow agent of adding 2.5g; Effective constituent 100%], the Surfynol DF-110D[Air Products Japan (strain) as defoamer of 2.5g system; Effective constituent 100%], the waste river chemical industry of Super Ester NS-100H[using solid component meter as tackifying resin (strain) system of 125g; 50 DEG C of second-order transition temperatures], the epoxy compounds Tetrad C[Mitsubishi's gas chemistry (strain) as linking agent of 0.15g (0.03 mass parts) system], filtering with 200 order wire nettings, is binder composition (1) thereby obtain water-dispersed acrylic.

(Production Example 2)

Except making the use level of the linking agent in Production Example 1 from 0.15g (0.03 mass parts) becomes 0.2g (0.04 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (2).

(Production Example 3)

Except making the use level of the linking agent in Production Example 1 from 0.15g (0.03 mass parts) becomes 0.25g (0.05 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (3).

(Production Example 4)

Replace the tackifying resin Super Ester NS-100H solids component 125g using in Production Example 1, use the waste river chemical industry of the Super Ester E-865NT[with solid component meter (strain) system of 62.5g; 100 DEG C of second-order transition temperatures], the waste river chemical industry of the Super Ester E-200NT[with solid component meter of 62.5g (strain) system; 90 DEG C of second-order transition temperatures], make the use level of linking agent become 0.35g (0.07 mass parts) from 0.15g (0.03 mass parts), similarly manufacturing water-dispersed acrylic with Production Example 1 is in addition binder composition (4).

(Production Example 5)

Except replacing the emulsion 1000g[dry of the acrylic copolymer (1) using in Production Example 3; 500g], use aforesaid acrylic copolymer (2) in addition, with Production Example 3 similarly, manufacture water-dispersed acrylic be binder composition (5).

(Production Example 6)

Except the use level that makes the linking agent in Production Example 5 is become as 0.4g (0.08 mass parts) from 0.25g (0.05 mass parts), with Production Example 5 similarly, manufacture water-dispersed acrylic be binder composition (6).

(Production Example 7)

Except replacing the emulsion 1000g[dry of the acrylic copolymer (2) using in Production Example 6; 500g], use aforesaid acrylic copolymer (3) in addition, with Production Example 6 similarly, manufacture water-dispersed acrylic be binder composition (7).

(Production Example 8)

Except making the use level of the linking agent in Production Example 7 from 0.4g (0.08 mass parts) becomes 0.5g (0.1 mass parts), with Production Example 7 similarly, manufacture water-dispersed acrylic be binder composition (8).

(Production Example 9)

Except replacing the tackifying resin Super Ester NS-100H solids component 125g using in Production Example 1, use the waste river chemical industry of the Super Ester E-200NT[with solid component meter (strain) system of 125g; 90 DEG C of second-order transition temperatures], make the use level of linking agent become 0.35g (0.07 mass parts) in addition from 0.15g (0.03 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (9).

(Production Example 10)

Except replacing the tackifying resin Super Ester NS-100H solids component 125g using in Production Example 1, use the waste river chemical industry of the Super Ester E-865NT[with solid component meter (strain) system of 125g; 100 DEG C of second-order transition temperatures], make the use level of linking agent become 0.35g (0.07 mass parts) in addition from 0.15g (0.03 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (10).

(Production Example 11)

Except replacing the tackifying resin Super Ester NS-100H solids component 125g using in Production Example 1, use 50g, make the use level of linking agent become 0.35g (0.07 mass parts) in addition from 0.15g (0.03 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (11).

(Production Example 12)

Except replacing the tackifying resin Super Ester NS-100H solids component 125g using in Production Example 1, use 200g, make the use level of linking agent become 0.5g (0.1 mass parts) in addition from 0.15g (0.03 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (12).

(Production Example 13)

Except replacing the emulsion 1000g[dry of the acrylic copolymer (1) using in Production Example 4; 500g], use aforesaid acrylic copolymer (4) in addition, with Production Example 4 similarly, manufacture water-dispersed acrylic be binder composition (13).

(Production Example 14)

Except replacing the emulsion 1000g[dry of the acrylic copolymer (1) using in Production Example 4; 500g], use aforesaid acrylic copolymer (5) in addition, with Production Example 4 similarly, manufacture water-dispersed acrylic be binder composition (14).

(relatively Production Example 1)

Except making the use level of the linking agent in Production Example 4 from 0.35g (0.07 mass parts) becomes 0.15g (0.03 mass parts), with Production Example 4 similarly, manufacture water-dispersed acrylic be binder composition (H1).

(relatively Production Example 2)

Except making the use level of the linking agent in Production Example 1 from 0.15g (0.03 mass parts) becomes 0.4g (0.08 mass parts), with Production Example 1 similarly, manufacture water-dispersed acrylic be binder composition (H2).

(relatively Production Example 3)

Except making the use level of the linking agent in Production Example 5 from 0.25g (0.05 mass parts) becomes 0.15g (0.03 mass parts), with Production Example 5 similarly, manufacture water-dispersed acrylic be binder composition (H3).

(relatively Production Example 4)

Except making the use level of the linking agent in Production Example 5 from 0.25g (0.05 mass parts) becomes 0.2g (0.04 mass parts), with Production Example 5 similarly, manufacture water-dispersed acrylic be binder composition (H4).

(relatively Production Example 5)

Except making the use level of the linking agent in Production Example 5 from 0.25g (0.05 mass parts) becomes 0.5g (0.1 mass parts), with Production Example 5 similarly, manufacture water-dispersed acrylic be binder composition (H5).

(relatively Production Example 6)

Except making the use level of the linking agent in Production Example 7 from 0.4g (0.08 mass parts) becomes 0.6g (0.03 mass parts), with Production Example 7 similarly, manufacture water-dispersed acrylic be binder composition (H6).

[making of self adhesive tape]

(embodiment 1)

Become the mode of 20 μ songs with dried thickness, on the polyester film of the thickness 75 μ m through demoulding processing, the water-dispersed acrylic of coating Production Example 1 gained is binder composition (1), 85 DEG C dry 2 minutes and obtain binder layer.The binder layer of gained is transferred to the two sides of black liquid coat film (A), with the hot-rolling of 80 DEG C, carries out lamination with the pressure of 4kgf/cm, further 40 DEG C of slakings 2 days, thereby obtain the double-faced adhesive tape of embodiment 1.

(embodiment 2～14)

Except the water-dispersed acrylic of use Production Example 2～14 gained is binder composition (2)～(14), similarly to Example 1, obtain the double-faced adhesive tape of embodiment 2～14.

(comparative example 1～6)

Be binder composition (H1)～(H6) except using relatively the water-dispersed acrylic of Production Example 1～6 gained, with above-described embodiment 1 similarly, obtain the double-faced adhesive tape of comparative example 1～6.

For binder composition, the self adhesive tape of above-described embodiment 1～8, comparative example 1～6 gained, carry out following evaluation.In table, show the result of gained.

(mensuration of the second-order transition temperature of acrylic copolymer)

Use the emulsion of acrylic copolymer, according to above-mentioned self adhesive tape create conditions do in flakes, overlapping to till 5mm thickness to make test film.Use test for viscoelastic machine (Rheometrics company system, trade(brand)name: Ares2KFRTNl), between the parallel disk of the determination part of same trier, sandwich test film, measure with the heat-up rate of the frequency of 1Hz, 2 DEG C/min the storage elastic modulus till from-50 DEG C to 150 DEG C (G ') and loss elastic modulus (G "); calculate tan δ according to following formula, as second-order transition temperature.

(mensuration of the second-order transition temperature of tackifying resin)

Use vacuum drier, under vacuum, make 60 DEG C of tackifying resins dry more than 2 days, thereby obtain the test sample of dry weight 10mg.For this test sample, use DSC determinator (Mettler-Toledo (strain) system, trade(brand)name: DSC822), the temperature range of-50 DEG C to 200 DEG C, with the heat-up rate of 2 DEG C/min, measure continuous 2 DSC curves, measure second-order transition temperature by the determination data of the 2nd time.

(mensuration of the second-order transition temperature of binder layer)

By the binder layer of making according to creating conditions of above-mentioned self adhesive tape, overlapping till 5mm thickness, to make test film.Use test for viscoelastic machine (Rheometrics company system, trade(brand)name: Ares2KFRTNl), between the parallel disk of the determination part of same trier, sandwich test film, measure with the heat-up rate of the frequency of 1Hz, 2 DEG C/min the storage elastic modulus till-50 DEG C to 150 DEG C (G ') and loss elastic modulus (G "); calculate tan δ according to following formula, as second-order transition temperature.

tanδ=G”／G’

(mensuration of the gel fraction of binder layer)

According to creating conditions of above-mentioned self adhesive tape, become the mode of 25 μ m with dried thickness, be arranged on polyester film (through the film of lift-off processing) modulation test film.Test film is cut into the size of 20mm × 100mm, peel off polyester film, measure the weight a before toluene extraction.Secondly, same test film was immersed in toluene after 24 hours, takes out jello, 100 DEG C dry 2 hours, measure the weight b after toluene extraction.Gel fraction calculates by following calculating formula.

Gel fraction (%)=(b/a) × 100

(fluctuating/tests of blooming)

By the self adhesive tape of above-mentioned preparation, at 23 DEG C, stamping-out processes as the self adhesive tape (profile: 32mm × 42mm of the architrave shape of Fig. 1, width: 2mm) black ink liquid side, be attached on glass, white ink liquid side is attached to the thin optical film " BEFRP2RC " of 3M company system, and (120 μ are (profile: 30mm × 40mm m), profile variation rate/flow direction leave standstill 5 minutes in the moisture eliminator of 85 DEG C time :+0.08%, width :-0.08%) (Fig. 1).And then the each limit of width that self adhesive tape contacts with blooming is all 1mm.These parts are left standstill to 72 hours at 85 DEG C, then leave standstill 1 hour at 23 DEG C, observe 85 DEG C of appearance change that leave standstill front and back.

Zero: deformation does not occur in blooming

△: deformation occurs in blooming

×: in blooming, there is large deformation

(resistance to repellency test)

As Fig. 2, the self adhesive tape wide with 3mm attaches the PET film of 100 μ m (UNITIKA Emblet SA#100 processed) and polycarbonate (PC) plate of 2mm thickness.Then, under the condition once coming and going at 2kg roller, pressurize, observe floating after 60 DEG C of placements in 90%RH72 hour and peel off.While producing more than 0.5mm float, thickness disparity is serious, is unsuitable for Liquid Crystal Module and fixedly uses self adhesive tape.

Zero: float to peel off and be less than 0.5mm

×: float and peel off as more than 0.5mm

[table 1]

[table 2]

[table 3]

From above-mentioned table 1～3, the self adhesive tape of the present invention of embodiment 1～14, even if use the aqueous adhesive that has reduced VOC, also can suppress well fluctuating, the deformation of blooming, and have good resistance to repellency.On the other hand, the self adhesive tape of comparative example can not be taken into account the fluctuating of blooming, inhibition and the resistance to repellency of deformation.

Nomenclature

10 ... double-faced adhesive tape

11 ... blooming

12 ... glass

20 ... self adhesive tape

21 ... PC plate

22 ... PET film

23 ... double-sided belt

Claims

1. a self adhesive tape, it is the fixing self adhesive tape for blooming, it is characterized in that, the binder layer joining with blooming is to be the binder layer that binder composition forms by water-dispersed acrylic,

The second-order transition temperature of described binder layer is below-5 DEG C, and gel fraction is 25～45%.

2. self adhesive tape as claimed in claim 1, wherein, described water-dispersed acrylic is that to contain second-order transition temperature be that the acrylic copolymer of-45～-25 DEG C and second-order transition temperature are the tackifying resin of 30～120 DEG C to binder composition.

3. self adhesive tape as claimed in claim 1 or 2, wherein, for the described acrylic copolymer of 100 mass parts, the content of tackifying resin is 10～40 mass parts.

4. the self adhesive tape as described in any one in claim 1～3, wherein, described acrylic copolymer contains the 2-EHAs more than 40 quality % that account in the monomer component using in acrylic copolymer.

5. the self adhesive tape as described in any one in claim 1～4, wherein, described blooming is prismatic lens.