CN106795401A - Optical film fixation double-faced adhesive tape - Google Patents

Abstract

It is an object of the invention to provide the optical film fixation double-faced adhesive tape with permanent load fissility high, resistance to strain stress high and adhesive tape processability for adherend of the fixation for optical film.The present invention is a kind of optical film fixation double-faced adhesive tape, it is the optical film fixation double-faced adhesive tape for optical film to be fixed on adherend, it has containing being that 500,000~1,800,000, molecular weight distribution (Mw/Mn) is 1.05~2.5 acrylic polymer and the adhesive phase of crosslinking agent by weight average molecular weight obtained from active free radical polymerization, with removing load after applying the 3 minutes load of 200g at 80 DEG C in small shearing Departure displacement determination test, further across 3 minutes after the Departure displacement recovery rate that measures be 30~90% adhesive phase.

Description

Optical film fixation double-faced adhesive tape

Technical field

The present invention relates to be used for optical film fixation with the permanent load fissility high for adherend, resistance to strain high The optical film fixation double-faced adhesive tape of stress and adhesive tape processability.

Background technology

It is being equipped with mancarried electronic aid (such as portable phone, mobile information end of image display device or input unit End etc.) in, double-faced adhesive tape is used to assemble.Specifically, for example, in order to be used to protect the table of mancarried electronic aid The protection panels in face be adhered on the optical film of touch panel module or display pannel module or by touch panel module with Display pannel module is bonded, and uses double-faced adhesive tape.

Such double-faced adhesive tape is for example punched into the shapes such as border shape, and configuration is used on the periphery of display picture (such as patent document 1,2).

For the double-faced adhesive tape of the fixation for optical film, in addition to requiring bonding force, resistance to strain stress is also required Property.That is, in the case that the optical film in the fixation by adhesive tape is exposed under high temperature, due to adhesive tape and the line of optical film The difference of the coefficient of expansion, and produced in the behavior that both elongations are shunk different.If adhesive tape is with optical film by solid securely Fixed, then the stress for being produced by the difference of the behavior that the elongation is shunk is remained in optical film, the reason for as optical strain. If adhesive tape and the fixed of optical film are relaxed, although the generation of optical strain can be suppressed, bonding force is produced to become Insufficient problem.So, in general bonding force is in compromise relation with resistance to strain stress.

Especially, it is necessary to coating weight is big in being adhesively fixed of the part in large-scale mancarried electronic aid in recent years Part or component, and big is become to the load that adhesive tape applies.Additionally, in mancarried electronic aid in recent years, reducing display The periphery of picture and ensure wider array of picture so-called narrow frameization propulsion, in the mancarried electronic aid of narrow frame due to The width of the periphery of picture is extremely narrow, even if it requires the narrow bonding high that reliably can also fix component of bond area Power, especially it is difficult in load constant load the permanent load fissility high peeled off.

And then, for the fixation of the optical film in mancarried electronic aid, it is necessary to which double-faced adhesive tape is punched into border shape etc. Shape.Now, if adhesive attachment is on the blade of guillotine, continuously cutting operation becomes difficult.Particularly as described above When advancing narrow frame like that and cutting into narrower border shape, the attachment of adhesive turns into problem.Therefore, also require cutting out Cut the adhesive tape higher that adhesive in operation without being adhered on the blade of guillotine and can continuously cut into narrow frame shape Processability.

Therefore, for the double-faced adhesive tape used in the fixation of the optical film in mancarried electronic aid, requirement is gradually become More than the conventional permanent load fissility high for adherend, resistance to strain stress high and adhesive tape processability.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2009-242541 publications

Patent document 2：Japanese Unexamined Patent Publication 2009-258274 publications

The content of the invention

Invent problem to be solved

The present invention is in view of above-mentioned present situation, it is therefore an objective to provide fixation for optical film with high constant for adherend The optical film fixation double-faced adhesive tape of load fissility, resistance to strain stress high and adhesive tape processability.

Scheme for solving problem

The present invention is a kind of optical film fixation double-faced adhesive tape, and it is the optics for optical film to be fixed on adherend Film fixation double-faced adhesive tape, it is 500,000~180 that it has containing weight average molecular weight obtained from active free radical polymerization is passed through Ten thousandth, molecular weight distribution (Mw/Mn) is 1.05~2.5 acrylic polymer and the adhesive phase of crosslinking agent, with small Apply at 80 DEG C to remove load after the 3 minutes load of 200g in shearing Departure displacement determination test, further across 3 minutes after The Departure displacement recovery rate for measuring is 30~90% adhesive phase.

The present invention is described in detail below.

The present inventors has found, with containing by weight average molecular weight obtained from active free radical polymerization and molecular weight point Cloth (Mw/Mn) acrylic polymer in a specific range and crosslinking agent and determine examination in small shearing Departure displacement The Departure displacement recovery rate measured in testing is that the double-faced adhesive tape of 30~90% adhesive phase can have been given play to for adherend Permanent load fissility high, resistance to strain stress high and adhesive tape processability, so as to complete the present invention.

Optical film of the invention is fixed with double-faced adhesive tape (hereinafter also referred to as " double-faced adhesive tape ".) inclined in small shearing Off normal move in determination test apply at 80 DEG C to remove load after the 3 minutes load of 200g, further across 3 minutes after measure Departure displacement recovery rate is 30~90%.

If above-mentioned Departure displacement recovery rate is within the above range, double-faced adhesive tape can take into account the Gao Heng for adherend Determine load fissility, resistance to strain stress high, good adhesive tape processability.If above-mentioned Departure displacement recovery rate is less than 30%, Then adhesive phase becomes excessively soft and becomes to be easily peeled off, it is impossible to play permanent load fissility high, in addition adhesive tape processability Deteriorate.If more than 90%, adhesive phase becomes really up to the mark, and resistance to strain stress declines.Above-mentioned Departure displacement recovery rate it is preferred Lower limit be 35%, the preferred upper limit be 85%, the preferred upper limit be 80%.

Would indicate that the schematic diagram of outline of the device used in above-mentioned small shearing Departure displacement determination test in Fig. 1 In.Above-mentioned Departure displacement recovery rate can use such small shearing Departure displacement determination test device shown in Fig. 1, for example Operate as in the following manner and be measured.

First, will be peeled off as the double-faced adhesive tape of subjects mold release film in face, in the adhesive phase for exposing After upper attaching implements polyethylene terephthalate (PET) film of sided corona treatment, cut into 1cm wide × 12cm long and be made Test film 5.

Thermosistor 4 (combination of such as Peltier's element and cooling cooling unit) is set as 80 DEG C, in design temperature It is lower to place to stabilization.

Another mold release film of test film 5 is peeled off from end 3cm or so and is removed, the adhesive phase that will expose is according to viscous Junction mode of the product as 1cm × 1cm is attached on adherend 3.

The block 2 of the quartz system that end face has been carried out mirror surface treatment is placed on attaching face, test film 5 is installed to and is lain in On iron wire on the counterweight 6 of 200g.Place in this condition, thermostatic 5 minutes.

After 5 minutes, the PC that is connected with device of operation and start imposed load, 3 minutes are given to test film 5 to horizontal direction Shear load.Wherein, laser interferometer 1 is passed through with the mirror on test film 5 with the Departure displacement amount of deformation of binder The form of amount of movement for managing quartz wedge 2 is detected, 3 minutes it is per second all using PC come record value.

Load is removed after 3 minutes, by laser interferometer 1 with the amount of movement of the mirror surface treatment quartz wedge 2 on test film 5 Form and detect with deformation of binder Departure displacement recovery, 3 minutes it is per second all using PC come record value.

After off-test, can be calculated " Departure displacement recovery rate " based on following calculating formula.

Departure displacement recovery rate (%)={ (Departure displacement (μm) of the load load after 3 minutes)-(removing load is after 3 minutes Departure displacement (μm))/(Departure displacement (μm) of the load load after 3 minutes) × 100

Double-faced adhesive tape of the invention contains acrylic polymer and crosslinking agent.

Aforesaid propylene acids polymers be by weight average molecular weight obtained from active free radical polymerization be 500,000~180 Ten thousand and molecular weight distribution (Mw/Mn) be 1.05~2.5 polymer.Like this, weight average molecular weight and molecular weight distribution (Mw/Mn) the extremely homogeneous of acrylic polymer in a specific range, with the component of polymer comprising such homogeneous The double-faced adhesive tape of adhesive phase can give play to the permanent load fissility high and adhesive tape processability for adherend.

If above-mentioned weight average molecular weight is less than 500,000, above-mentioned adhesive phase becomes excessively soft, and heat resistance declines.If above-mentioned Weight average molecular weight is more than 1,800,000, then viscosity when applying sometimes is too high and become to be difficult to apply, and produces the thickness of above-mentioned adhesive phase Degree is uneven.The preferred lower limit of the weight average molecular weight (Mw) of aforesaid propylene acids polymers is 600,000, and the preferred upper limit is 140 Ten thousand.

If above-mentioned molecular weight distribution is more than 2.5, the low molecular weight compositions included in component of polymer are more, for adherend Permanent load fissility decline, adhesive tape processability is also deteriorated.The preferred upper limit of above-mentioned molecular weight distribution is 2.0, more preferably The upper limit be 1.8, the further preferred upper limit is 1.7.

It is explained, molecular weight distribution (Mw/Mn) is the ratio of weight average molecular weight (Mw) and number-average molecular weight (Mn).

Weight average molecular weight (Mw) and number-average molecular weight (Mn) can be changed by gel permeation chromatography (GPC) method with polystyrene The form of molecular weight is calculated to determine.Specifically, weight average molecular weight (Mw) and number-average molecular weight (Mn) are will to make living radical Polymerization crosslinking acrylic polymer dilution filter obtained from tetrahydrofuran (THF) dilutes 50 times is filtered, Determined in the form of the polystyrene conversion molecular weight by GPC method using resulting filtrate.In GPC method, for example can be with Use 2690 Separations Model (Waters company systems) etc..

Aforesaid propylene acids polymers are by polymer obtained from active free radical polymerization.Active free radical polymerization is Polymerisation will not be stopped reaction or the side reaction obstruction such as chain transfer reaction and polymerization that strand is grown into.According to activity Radical polymerization, such as it is poly- with molecular weight evenly and composition compared with free radical polymerization etc. due to that can obtain Compound, can suppress the generation of low molecular weight compositions etc., it is possible to the weight average molecular weight of the acrylic polymer that will be obtained And molecular weight distribution (Mw/Mn) is set as desired scope.And then, there is bridging property function in aforesaid propylene acids polymers In the case of group, can make in whole polymer comprising the cross-linking functional group, permanent load higher can be played and peeled off Property.

The schematic diagram of explanation active free radical polymerization is represented in Fig. 2.Active free radical polymerization is that polymerisation will not be stopped Only reaction or the side reaction obstruction such as chain transfer reaction and polymerization that strand is grown into.In active free radical polymerization, growth End free base will not be inactivated, and also will not newly produce free radical kind in the reaction in addition, and reaction is carried out.In its reaction way, entirely The polymer chain in portion equably with monomer reaction and be polymerized, the composition of whole polymer is close to uniform.Therefore, official containing bridging property The monomer 112 that can be rolled into a ball is contained in whole polymer of resulting acrylic polymer 11.If will be by such work Acrylic polymer 11 obtained from the polymerization of free love base is crosslinked using crosslinking agent, then most polymer can Participate in the crosslinking between polymer chain.It is particularly due to the low molecular weight compositions not comprising the monomer containing cross-linking functional group few, institute Improved with the probability that whole polymer chains participates in crosslinking.Show that explanation will be by obtained from active free radical polymerization in Fig. 3 The schematic diagram of the situation that acrylic polymer is crosslinked.The acrylic obtained from by active free radical polymerization In thing, because the composition of whole polymer is uniform, comprising the monomer containing cross-linking functional group, so the polymer chain ginseng of whole With crosslinking.It is explained, describes hydroxyl in Fig. 3 as the example of cross-linking functional group.Due to almost all like this The polymer crosslinking that can participate between polymer chain, it is possible to obtain that for adherend permanent load high can be played peeling off The adhesive tape of property.

In conventional free radical polymerization, it is difficult to which weight average molecular weight and molecular weight distribution (Mw/Mn) are adjusted into institute Desired scope.

The schematic diagram of the free radical polymerization of explanation is represented in Fig. 4.In free radical polymerization, in the reaction continuously Produce free radical kind and with monomer addition, polymerization carries out.Therefore, in free radical polymerization, generation is raw in the way of reaction The polymer 123 of end free base inactivation long and the polymer 124 for being grown by the new free radical kind for producing in the reaction. Therefore, if manufacturing the acrylic polymer containing cross-linking functional group by free radical polymerization, molecule can be generated Amount is than the relatively low polymer not comprising the monomer containing cross-linking functional group.Even if will be by such free radical polymerization The acrylic polymer 12 for obtaining is crosslinked using crosslinking agent, the polymer not comprising the monomer containing cross-linking functional group The crosslinking between polymer chain cannot be participated in.Represent that explanation will be by acrylic polymer obtained from free radical polymerization in Fig. 5 The schematic diagram of the situation that compound is crosslinked.For by the acrylic polymer obtained from radical polymerization that dissociates, Because the composition of polymer is uneven, comprising molecular weight than the relatively low polymer not comprising the monomer containing cross-linking functional group, So in the presence of the polymer chain that cannot participate in crosslinking.In addition, the example in Fig. 5 as cross-linking functional group describes hydroxyl. When adhering to adherend and imposed load as double-faced adhesive tape, due to from cannot participate in crosslinking not comprising function containing bridging property The position of the monomer of group is peeling, so the permanent load fissility for adherend cannot be played.

Had the following properties that by acrylic polymer obtained from active free radical polymerization like this：With by trip From acrylic polymer obtained from radical polymerization etc. compared to the molecular weight and composition having evenly, low molecular weight compositions Content it is few, the monomer containing cross-linking functional group is contained in most polymer.For the permanent load high of adherend Fissility, resistance to strain stress high, effect of the invention as adhesive tape processability are by using poly- by living radical Acrylic polymer obtained from conjunction and bring into play first.

Such characteristic by acrylic polymer obtained from active free radical polymerization is will not by polymerisation It is stopped reaction or the side reaction obstruction such as chain transfer reaction and strand is grown into the such system of this active free radical polymerization Make method and cause.Even if however, as weight average molecular weight (Mw) or polymer entirety as molecular weight distribution (Mw/Mn) Average value for can be indirectly indicative characteristic by acrylic polymer obtained from active free radical polymerization, directly Ground determines that the structure or characteristic of the monomer component in chain length, each polymer of each polymer for being included etc. are also extremely tired Difficult.Have to directly determine by acrylic obtained from active free radical polymerization by its structure or characteristic Thing is impossible or almost unpractiaca.Therefore, in the present invention, should allow that utilization " is obtained by active free radical polymerization To ... acrylic polymer " and the manufacture method of the material record active free radical polymerization acrylic polymer.

In active free radical polymerization, the active free radical polymerization and other activity of organic tellurium polymerization initiator have been used Radical polymerization is different, not to the radical polymerization with cross-linking functional groups such as carboxyl, hydroxyl, amino, amide groups and itrile groups In the case that any one of conjunction property monomer is protected, can be obtained that there is uniform point so that same initiator is polymerized The polymer of son amount and composition.Therefore, it is possible to the free radical polymerization monomer with cross-linking functional group is easily total to It is poly-.

As long as above-mentioned organic tellurium polymerization initiator is generally used for the initiator of active free radical polymerization, then do not limit especially It is fixed, can for example include Organic Tellurium Compounds, organic tellurides compound etc..

As above-mentioned Organic Tellurium Compounds, for example, can include (methyl telluro-methyl) benzene, (1- methyl telluro-ethyl) Benzene, (2- methyl telluro-propyl group) benzene, the chloro- 4- of 1- (methyl telluro-methyl) benzene, 1- hydroxyls -4- (methyl telluro-methyl) benzene, 1- Methoxyl group -4- (methyl telluro-methyl) benzene, 1- amino -4- (methyl telluro-methyl) benzene, 1- nitros -4- (methyl telluros-first Base) benzene, 1- cyano group -4- (methyl telluro-methyl) benzene, 1- methyl carbonyls -4- (methyl telluro-methyl) benzene, 1- phenylcarbonyl groups -4- (methyl telluro-methyl) benzene, 1- methoxycarbonyls -4- (methyl telluro-methyl) benzene, 1- phenyloxycarbonyls -4- (methyl telluro - Methyl) benzene, 1- sulfonyls -4- (methyl telluro-methyl) benzene, 1- trifluoromethyls -4- (methyl telluro-methyl) benzene, the chloro- 4- of 1- (1- methyl telluro-ethyl) benzene, 1- hydroxyls -4- (1- methyl telluro-ethyl) benzene, 1- methoxyl groups -4- (1- methyl telluro-ethyl) Benzene, 1- amino -4- (1- methyl telluro-ethyl) benzene, 1- nitros -4- (1- methyl telluro-ethyl) benzene, 1- cyano group -4- (1- methyl Telluro-ethyl) benzene, 1- methyl carbonyls -4- (1- methyl telluro-ethyl) benzene, 1- phenylcarbonyl groups -4- (1- methyl telluro-ethyl) Benzene, 1- methoxycarbonyls -4- (1- methyl telluro-ethyl) benzene, 1- phenyloxycarbonyls -4- (1- methyl telluro-ethyl) benzene, 1- sulphurs Acyl group -4- (1- methyl telluro-ethyl) benzene, 1- trifluoromethyls -4- (1- methyl telluro-ethyl) benzene, the chloro- 4- of 1- (2- methyl telluriums Base-propyl group) benzene, 1- hydroxyls -4- (2- methyl telluro-propyl group) benzene, 1- methoxyl groups -4- (2- methyl telluro-propyl group) benzene, 1- ammonia Base -4- (2- methyl telluro-propyl group) benzene, 1- nitros -4- (2- methyl telluro-propyl group) benzene, 1- cyano group -4- (2- methyl telluros-the third Base) benzene, 1- methyl carbonyls -4- (2- methyl telluro-propyl group) benzene, 1- phenylcarbonyl groups -4- (2- methyl telluro-propyl group) benzene, 1- first Epoxide carbonyl -4- (2- methyl telluro-propyl group) benzene, 1- phenyloxycarbonyls -4- (2- methyl telluro-propyl group) benzene, 1- sulfonyls -4- (2- methyl telluro-propyl group) benzene, 1- trifluoromethyls -4- (2- methyl telluro-propyl group) benzene, 2- (methyl telluro-methyl) pyridine, 2- (1- methyl telluro-ethyl) pyridine, 2- (2- methyl telluro-propyl group) pyridine, 2- methyl telluro-methyl acetate, 2- methyl telluro- Methyl propionate, 2- methyl telluro -2 Methylpropionic acid methyl esters, 2- methyl telluro-ethyl acetate, 2- methyl telluro-ethyl propionate, 2- Methyl telluro -2 Methylpropionic acid ethyl ester, 2- methyl telluros acetonitrile, 2- methyl telluros propionitrile, 2- methyl -2- methyl telluro propionitrile Deng.Methyl telluro in these Organic Tellurium Compounds can also be ethyl telluro, n-propyl telluro, isopropyl telluro, normal-butyl Telluro, isobutyl group telluro, tert-butyl group telluro, phenyl telluro etc., additionally, these Organic Tellurium Compounds can be used alone, also may be used Be two kinds or more.

As above-mentioned organic tellurides compound, for example, can include the tellurides of dimethyl two, the tellurides of diethyl two, two The tellurides of n-propyl two, the tellurides of diisopropyl two, the tellurides of Bicyclopropyl two, the tellurides of di-n-butyl two, di-sec-butyl two Tellurides, the tellurides of di-t-butyl two, the tellurides of two cyclobutyl two, the tellurides of diphenyl two, double-(p-methoxyphenyl) two tellurium Compound, double-(p-aminophenyl) two tellurides, double-(p-nitrophenyl) two tellurides, double-(to cyano-phenyl) two tellurides, Double-(to sulfonvlphenyl) two tellurides, the tellurides of dinaphthyl two, the tellurides of bipyridyl two etc..These organic tellurides Compound can be used alone, it is also possible to be two kinds or more.Wherein, preferably the tellurides of dimethyl two, the tellurides of diethyl two, The tellurides of diη-propyl two, the tellurides of di-n-butyl two, the tellurides of diphenyl two.

It is explained, is not damaging in the range of effect of the invention, in addition to above-mentioned organic tellurium polymerization initiator, with Promote for the purpose of polymerization speed, azo-compound can also be used as polymerization initiator.

As long as the compound that above-mentioned azo-compound is generally used for radical polymerization is not particularly limited, for example, can arrange Enumerate 2,2 '-azo double (isobutyronitrile), 2,2 '-azo double (2- methylbutyronitriles), 2,2 '-azo double (2,4- methyl pentane nitriles), 2,2 '-azo double (4- methoxyl group -2,4- methyl pentane nitriles), 1,1- azos double (hexamethylene -1- formonitrile HCNs), 1- [(1- cyano group -1- Methylethyl) azo] formamide, 4,4 '-azo double (4- cyanopentanoic acids), dimethyl -2, the double (2 Methylpropionic acids of 2 '-azo Ester), dimethyl -1,1 '-azo double (1- cyclohexane carboxylates), 2, double { 2- methyl-N- [1,1 '-bis- (the hydroxyl first of 2 '-azo Base) -2- hydroxyethyls] propionamide, 2,2 '-azo double [2- methyl-N- (2- hydroxyethyls) propionamide], 2,2 '-azo are double [N- (2- acrylic) -2- methyl propanamides], 2,2 '-azo double (N- butyl -2- methyl propanamides), 2, double (the N- rings of 2 '-azo Hexyl -2- methyl propanamides), 2,2 '-azo double [2- (2- imidazoline -2- bases) propane] dihydrochloride, 2, the double { 2- of 2 '-azo [1- (2- hydroxyethyls) -2- imidazoline -2- bases] propane } dihydrochloride, 2, the double [2- (2- imidazoline -2- bases) third of 2 '-azo Alkane], 2,2 '-azo double (2- amidine propanes) dihydrochloride, 2, double [N- (2- the carboxy ethyls) -2- methyl-props amidines] four of 2 '-azo Hydrate, 2,2 '-azo double (1- imino group -1- pyrrolidinyl -2- methylpropanes) dihydrochloride, 2,2 '-azo double (2,4,4- Trimethylpentane) etc..These azo-compounds can be used alone, it is also possible to be two kinds or more.

The monomer containing cross-linking functional group is preferably comprised as the monomer mixture of the raw material of aforesaid propylene acids polymers. The above-mentioned monomer containing cross-linking functional group has the effect that cross-linking functional group is inserted in aforesaid propylene acids polymers.

As above-mentioned cross-linking functional group, for example, can include hydroxyl, carboxyl, glycidyl, amino, amide groups, nitrile Base etc..Wherein, from the gel fraction aspect for being easily adjusted above-mentioned adhesive phase, preferably hydroxyl or carboxyl, more preferably hydroxyl Base.

As the monomer with hydroxyl, for example, can include (methyl) acrylic acid 4- hydroxybutyls, (methyl) acrylic acid 2- (methyl) acrylate with hydroxyl such as hydroxy methacrylate.

As the monomer with carboxyl, for example, can include (methyl) acrylic acid.

As the monomer with glycidyl, for example, can include (methyl) glycidyl acrylate.

As the monomer with amide groups, for example, can include hydroxyethyl acrylamide, N-isopropylacrylamide, diformazan Base aminopropyl acrylamide etc..

As the monomer with itrile group, for example, can include acrylonitrile etc..

During (methyl) acrylate used containing the monomer of cross-linking functional group with hydroxyl as above-mentioned, above-mentioned monomer Content in mixture is not particularly limited, but preferred lower limit is 0.01 weight %, and the preferred upper limit is 30 weight %.If on The content for stating (methyl) acrylate with hydroxyl is less than 0.01 weight %, then sometimes resulting adhesive phase becomes excessively Softness, heat resistance declines, if more than 30 weight %, sometimes resulting adhesive phase becomes really up to the mark, and double-faced adhesive tape becomes It is easily peeled off, or resistance to strain stress declines.

During the acrylic monomer used containing the monomer of cross-linking functional group with carboxyl as above-mentioned, above-mentioned monomer is mixed Content in compound is not limited, but preferred lower limit is 0.1 weight %, and the preferred upper limit is 10 weight %.If above-mentioned have The content of the acrylic monomer of carboxyl is less than 0.1 weight %, then sometimes resulting adhesive phase becomes excessively soft, heat-resisting Property decline, if more than 10 weight %, sometimes resulting adhesive phase becomes really up to the mark, and double-faced adhesive tape becomes to be easily peeled off.

In order that above-mentioned adhesive phase meets above-mentioned Departure displacement recovery rate, the raw material as aforesaid propylene acids polymers Mix monomer can use (methyl) n-propyl, (methyl) n-butyl acrylate, (methyl) acrylic acid n-pentyl ester, The positive heptyl ester of (methyl) acrylic acid, (methyl) n-octyl, 2-EHA, the positive nonyl ester of (methyl) acrylic acid, (first Base) n-butyl acrylate, the positive last of the ten Heavenly stems ester of (methyl) acrylic acid, (methyl) acrylic acid n-dodecane ester etc., preferably comprise monomeric unit Glass transition point and n-butyl acrylate it is equal or less than its (methyl) acrylate.Wherein, it is special from that can play Set out in terms of resistance to strain stress high, preferably comprise acrylate that side chain carbon number is 8, particularly acrylic acid 2- second The own ester of base.

When above-mentioned mix monomer contains 2-EHA, the 2-EHA in above-mentioned monomer mixture Content be preferably more than 60 weight %, more preferably more than 80 weight %.It is used as master by containing 2-EHA Wanting composition, resulting adhesive phase can play extra high resistance to strain stress.

The mix monomer of the raw material as aforesaid propylene acids polymers can contain above-mentioned official containing bridging property as needed Other free radical polymerization monomers of (methyl) acrylate such as monomer, the 2-EHA that can be rolled into a ball.As it is above-mentioned its Its free radical polymerization monomer, for example, can include other (methyl) acrylate.Additionally, except aforesaid propylene acrylic monomer In addition, it is also possible to use vinyl compound as monomer.

In above-mentioned active free radical polymerization, it is possible to use dispersion stabilizer.As above-mentioned dispersion stabilizer, for example, can arrange Enumerate PVP, polyvinyl alcohol, methylcellulose, ethyl cellulose, poly- (methyl) acrylic acid, poly- (methyl) Acrylate, polyethylene glycol etc..

As the method for above-mentioned active free radical polymerization, using known method, for example, polymerisation in solution can be included (boiling point is polymerized or constant temperature polymerization), emulsion polymerization, suspension polymerisation, polymerisation in bulk etc..

When using polymer solvent in above-mentioned active free radical polymerization, the polymer solvent is not particularly limited, for example can be with Use the non-polar solvens such as hexane, hexamethylene, octane, toluene, dimethylbenzene, water, methyl alcohol, ethanol, propyl alcohol, butanol, acetone, methyl The polar solvent high such as ethyl ketone, methyl iso-butyl ketone (MIBK), tetrahydrofuran, diox, DMF.These polymer solvents Can be used alone, it is also possible to be two kinds or more.

Additionally, polymerization temperature is preferably 0~110 DEG C from from the viewpoint of polymerization speed.

The above-mentioned preferred gel fraction of adhesive phase is below 50 weight %.It is set as 50 weights by by above-mentioned gel fraction Amount below %, can give play to the permanent load fissility higher for adherend.

It is explained, gel fraction is as described below to be determined.First, adhesive tape is cut into the plane of 50mm × 100mm Oblong-shaped and make test film, by test film in ethyl acetate at 23 DEG C impregnate 24 hours after, taken from ethyl acetate Go out, dried 1 hour under conditions of 110 DEG C.The weight of dried test film is determined, gel point is calculated using following formula (1) Rate.It is explained, on test film, is used to protect the mold release film of adhesive phase without stacking.

Gel fraction (weight %) 100 × (W2-W0)/(W1-W0) (1)

(W0：The weight of base material, W1：The weight of the test film before dipping, W2：Dipping, the weight of dried test film)

Above-mentioned crosslinking agent is not particularly limited, according to the kind of the cross-linking functional group included in aforesaid propylene acids polymers Class, for example, select isocyanates system crosslinking agent, aziridine system crosslinking agent, epoxy crosslinking agent, metallo-chelate type crosslinking agent etc. And use.

For example when aforesaid propylene acids polymers have hydroxyl as cross-linking functional group, for example can be by using isocyanide Acid esters system crosslinking agent is crosslinked aforesaid propylene acids polymers as crosslinking agent.Additionally, aforesaid propylene acids polymers have carboxylic When base is as cross-linking functional group, for example can by using epoxy crosslinking agent or aziridine system crosslinking agent as crosslinking agent, It is crosslinked aforesaid propylene acids polymers.

Especially by acrylic polymer obtained from active free radical polymerization due to contained whole polymerization The composition of thing is uniform, with cross-linking functional group, so the polymer of whole can participate in the crosslinking between polymer chain.Therefore, Even thin adhesive tape is not easy to peel off, can obtain that for adherend permanent load fissility high and bonding can have been given play to The adhesive tape of agent cohesiveness.

Wherein, due to the closely sealed excellent in stability for base material, it is advantageous to isocyanates system crosslinking agent.As above-mentioned different Cyanate system crosslinking agent, for example, can include CORONATE HX (Nippon Polyurethane Industry CO., Ltd. System), CORONATE L (Nippon Polyurethane Industry CO., Ltd. system), MITEC NY260A (Mitsubishi Chemicals Company system) etc..

The use level of above-mentioned crosslinking agent is 0.01 weight relative to the preferred lower limit of the weight portion of aforesaid propylene acids polymers 100 Amount part, the preferred upper limit is 5 weight portions, and preferred lower limit is 0.1 weight portion, and the preferred upper limit is 3 weight portions.

Above-mentioned adhesive phase preferably also contains tackifying resin.Tackifying resin, both-sided adhesive are contained by above-mentioned adhesive phase Band is more improved for the permanent load fissility of adherend.Wherein, in the feelings using the tackifier with cross-linking functional group Under condition, can be crosslinked via crosslinking agent and aforesaid propylene acids polymers.

The preferred lower limit of the hydroxyl value of above-mentioned tackifying resin is 25, and the preferred upper limit is 55.If above-mentioned hydroxyl value departs from above-mentioned Scope, then adhesive tape declines for the permanent load fissility of adherend sometimes.The preferred lower limit of above-mentioned hydroxyl value is 30, more The preferred upper limit is 50.

In addition, hydroxyl value can be determined by JIS K1557 (phthalic anhydride method).

The preferred lower limit of the softening temperature of above-mentioned tackifying resin is 70 DEG C, and the preferred upper limit is 170 DEG C.If above-mentioned softening Temperature is less than 70 DEG C, then above-mentioned tackifying resin is excessively soft sometimes and permanent load fissility declines.If above-mentioned softening temperature surpasses 170 DEG C are crossed, then above-mentioned adhesive phase becomes really up to the mark sometimes, adhesive tape becomes to be easily peeled off, the permanent load for adherend is shelled Decline from property.The preferred lower limit of above-mentioned softening temperature is 120 DEG C.

In addition, softening temperature is the softening temperature determined by JIS K2207 ring and ball methods.

Above-mentioned tackifying resin is not particularly limited, and can include rosin series resin, the terpene phenol resins such as rosin ester system resin Etc. terpenic series resin, petroleum line resin etc..Wherein, preferably rosin ester system resin, terpene phenol resin.

Above-mentioned rosin ester system resin is by the rosin resin using rosin acid as main component, disproportionated rosin resin and hydrogenation The resin obtained from alcohol esterification such as dimer (polymeric rosin resin) of the resin acids such as rosin resin, rosin acid.By with It is not applied to esterification in a part for the hydroxyl of the alcohol of esterification and contains in resin, so that hydroxyl value is adjusted to above-mentioned model Enclose.As alcohol, the polyalcohols such as ethylene glycol, glycerine, pentaerythrite can be included.

It is explained, the resin after rosin resin is esterified is rosin ester resin, the tree after disproportionated rosin resin is esterified Fat is disproportionated rosin ester resin, and the resin after hydrogenated rosin resin is esterified is hydrogenated rosin ester resin, by polymeric rosin resin Resin after esterification is polymeric rosin ester resin.

Above-mentioned terpene phenol resin is resin obtained from making terpenes be polymerized in the presence of phenol.

As above-mentioned disproportionated rosin ester resin, for example, can include Huang Chuan chemical industrial companies Super ester A75 (75 DEG C of hydroxyl value 23, softening temperature), Huang Chuan chemical industrial companies Super ester A100 (hydroxyl value 16, softening temperature 100 DEG C), Huang Chuan chemical industrial companies Super ester A115 (115 DEG C of hydroxyl value 19, softening temperature), Huang Chuan chemical industrial companies Super ester A125 (125 DEG C of hydroxyl value 15, softening temperature) processed etc..As above-mentioned hydrogenated rosin ester resin, for example, can enumerate Chu Huang rivers chemical industrial company Pinecrystal KE-359 (100 DEG C of hydroxyl value 42, softening temperature), Huang Chuan chemical industrial companies Ester Gum H (70 DEG C of hydroxyl value 29, softening temperature) processed etc..As above-mentioned polymeric rosin ester resin, for example, can include waste river Chemical industrial company PENSEL D135 (135 DEG C of hydroxyl value 45, softening temperature), Huang Chuan chemical industrial companies PENSEL D125 (125 DEG C of hydroxyl value 34, softening temperature), Huang Chuan chemical industrial companies PENSEL D160 (160 DEG C of hydroxyl value 42, softening temperature) etc..

As above-mentioned terpenic series resin, for example, can include YASUHARA CHEMICAL CO., LTD. YS Polystar G150 (150 DEG C of softening point), YASUHARA CHEMICAL CO., LTD. YS Polystar T100 (soften Point 100 DEG C), YASUHARA CHEMICAL CO., LTD. YS Polystar G125 (125 DEG C of softening point), YASUHARA CHEMICAL CO., LTD. YS Polystar T115 (115 DEG C of softening point), YASUHARA CHEMICAL CO., LTD. systems YS Polystar T130 (130 DEG C of softening point) etc..

These tackifying resins can be used alone, it is also possible to be two kinds or more.

The content of above-mentioned tackifying resin is 5 weights relative to the preferred lower limit of the weight portion of aforesaid propylene acids polymers 100 Amount part, the preferred upper limit is 40 weight portions.If above-mentioned content is less than 5 weight portions, double-faced adhesive tape becomes to be easily peeled off sometimes, Permanent load fissility for adherend declines.Even if above-mentioned content is more than 40 weight portions, sometimes also by glass transition The rising of temperature (Tg) and above-mentioned adhesive phase is become really up to the mark, double-faced adhesive tape becomes to be easily peeled off.

Above-mentioned adhesive phase can contain plasticizer, emulsifying agent, softening agent, filler, pigment, dyestuff, silicon as needed Other resins such as the additives such as alkane coupling agent, antioxidant etc..

Even double-faced adhesive tape of the invention is also difficult to peel off due to thin adhesive tape, so can be made according to purposes State adhesive phase and base material described later is thinning.

The thickness of above-mentioned adhesive phase according to purposes due to setting, so be not particularly limited, but preferred lower limit is 1 μm, the preferred upper limit is 100 μm.If above-mentioned thickness is less than 1 μm, adhesive tape becomes to be easily peeled off sometimes, for adherend Permanent load fissility declines.If above-mentioned thickness cannot get thin adhesive tape sometimes more than 100 μm.Above-mentioned adhesive phase The preferred lower limit of thickness is 3 μm, and the preferred upper limit is 75 μm, and further preferred lower limit is 5 μm, further preferred The upper limit is 25 μm.

Double-faced adhesive tape of the invention can be support type with base material, or without base material without support Type.In the case of support type, in the above-mentioned adhesive phase of two-sided formation of base material.

Above-mentioned base material is not particularly limited, but can include resin film, foamed resin, paper, non-woven fabrics, filament nonwoven fabric etc..

As above-mentioned resin film, for example, can include the polyolefin-based resins such as polyethylene film, polypropylene screen film, PET film etc. It is the modified olefin such as polyester based resin film, ethylene-vinyl acetate copolymer or vinyl-acrylate copolymer resin film, poly- Vinyl chloride-based resin film, polyurethane series resin film, cyclic olefin polymer resin film etc..

As above-mentioned foamed resin, for example, can include polyethylene, polypropylene foam, acrylic foam, poly- ammonia Ester foam, ethylene propylene rubber foam etc..

As above-mentioned filament nonwoven fabric, for example, can include by the cloth of polyethylene flat filament braiding or in its surface laminated tree Cloth obtained from adipose membrane etc..

In the case of the two-sided tape for particularly being used in the assembling of display apparatus module, can also use to prevent Light and being printed as the base material of black, base material that white is printed as in order to light reflective is improved, evaporation has the film base of metal Material etc..

The thickness of above-mentioned base material according to purposes due to setting, so be not particularly limited, but in the feelings of such as film base material 1~100 μm, more preferably 5~75 μm is preferably under condition.If the thickness of above-mentioned base material is less than 1 μm, double-faced adhesive tape sometimes Mechanical strength declines.If the thickness of above-mentioned base material is more than 100 μm, the deflection of double-faced adhesive tape become too strong sometimes, becomes difficult Snugly fitted with the shape along adherend.

The manufacture method of double-faced adhesive tape of the invention is not particularly limited, for example, can include following methods etc.：Will be upper Acrylic polymer is stated to be mixed together and stir with other gradation compositions such as above-mentioned tackifying resin, above-mentioned crosslinking agent as needed Mix and prepare binder solution, then, the binder solution is coated on the PET film processed through the demoulding and makes its drying and shape Composite adhesives layer, by resulting adhesive phase turn adhere to base material it is two-sided on method；It is applied directly on base material and makes it Dry method.Can also will make that binder solution is coated on the PET film processed through the demoulding and makes its drying and formed is viscous Mixture layer is directly prepared into the adhesive tape without support type without base material.

Invention effect

In accordance with the invention it is possible to provide being peeled off with the permanent load high for adherend for the fixation for optical film The optical film fixation double-faced adhesive tape of property, resistance to strain stress high and adhesive tape processability.

Brief description of the drawings

Fig. 1 is the schematic diagram of the outline for representing the device used in small shearing Departure displacement determination test.

Fig. 2 is the schematic diagram for illustrating active free radical polymerization.

Fig. 3 is to illustrate showing situation about being crosslinked by acrylic polymer obtained from active free radical polymerization It is intended to.

Fig. 4 is the schematic diagram of the free radical polymerization of explanation.

Fig. 5 is to illustrate showing situation about being crosslinked by the acrylic polymer obtained from radical polymerization that dissociates It is intended to.

Fig. 6 is the schematic diagram of the test method of the degree for representing the optics membrane strain in measurement embodiment.

Fig. 7 is the schematic diagram of the test method for representing the permanent load disbonded test in embodiment.

Specific embodiment

Embodiment is exemplified below out to illustrate mode of the invention in more detail, but the present invention is not limited to this A little embodiments.

(synthesis of acrylic polymer)

(synthesis 1)

(synthesis 1-1)

Tellurium (40 mesh, metallic tellurium, Aldrich system) 6.38g (50mmol) is set to be suspended to tetrahydrofuran (THF) in 50mL, the n-BuLi/hexane solution (Aldrich of 1.6mol/L is lentamente added dropwise thereto at room temperature System) 34.4mL (55mmol).The reaction solution is stirred to metallic tellurium and is wholly absent.Added in the reaction solution at room temperature The bromo- isobutyrate 10.7g (55mmol) of ethyl -2-, stir 2 hours.After reaction terminates, under reduced pressure by solvent concentration, then Vacuum distillation is carried out, the 2- methyl -2- normal-butyls telluro-ethyl propionate of yellow oil is obtained.

(synthesis 1-2)

In the glove box replaced through argon, to the 2- methyl -2- normal-butyls that manufacture in synthesis example 1-1 is put into reaction vessel Telluro-ethyl propionate 19 μ L, V-60 (2,2 '-azobis isobutyronitrile and Wako Pure Chemical Industries company system) 1.4mg, ethyl acetate 1mL Afterwards, it is reaction vessel is closed, reaction vessel is taken out from glove box.Then, while to flowing into argon gas in reaction vessel, on one side To the mix monomer (2EHA shown in input table in reaction vessel 1：2-EHA, BA：Butyl acrylate, EA：Third Olefin(e) acid ethyl ester, AAc：Acrylic acid, HEA：Acrylic acid 2- hydroxy methacrylates) total 100g, the ethyl acetate as polymer solvent 66.5g, carries out 20 hours polymerisations at 60 DEG C, obtains containing through acrylic polymer obtained by active free radical polymerization Solution.

Being diluted obtained from tetrahydrofuran (THF) dilutes 50 times containing acrylic polymer solution obtained by making Liquid filter (material：Polytetrafluoroethylene (PTFE), aperture：0.2 μm) filtering, resulting filtrate is supplied to gel permeation chromatography (Waters company systems, 2690Separations Model), sample flow be 1 milliliter/min, column temperature be 40 DEG C under conditions of GPC measure is carried out, the polystyrene conversion molecular weight of polymer is determined, weight average molecular weight (Mw) and molecular weight distribution (Mw/ is obtained Mn).As post, using GPC KF-806L (Showa electrician company system), as detector, differential refractometer is used.

(synthesis 2~7)

Except make the inventory of 2- methyl -2- normal-butyls telluro-ethyl propionate, V-60 (2,2 '-azobis isobutyronitrile and Wako Pure Chemical Industries company system) inventory and mix monomer composition as was the case with table 1 beyond, with synthesis 1 in the same manner as operation and obtain To containing the solution through acrylic polymer obtained by active free radical polymerization, weight average molecular weight (Mw) and molecular weight distribution are obtained (Mw/Mn)。

(synthesis 8)

To being added in reaction vessel as the ethyl acetate 50g of polymer solvent, with nitrogen bubble after, while flow into nitrogen one While reaction vessel being heated and starting backflow.Then, to put into reaction vessel using as the V-60 of polymerization initiator (2,2 '- Azobis isobutyronitrile and Wako Pure Chemical Industries company system) 150mg with ethyl acetate dilute 10 times obtained from polymerization initiator it is molten Liquid, the total 100g for adding the mix monomer shown in table 1 was added dropwise with 2 hours.After completion of dropwise addition, to being thrown again in reaction vessel Enter as the V-60 of polymerization initiator (2,2 '-azobis isobutyronitrile and Wako Pure Chemical Industries company system) 150mg ethyl acetate Polymerization initiator solution obtained from 10 times of dilution, carries out 4 hours polymerisations, obtains containing through obtained by free radical polymerization The solution of acrylic polymer.

Weight average molecular weight (Mw) and molecular weight distribution (Mw/Mn) are obtained in the same manner as synthesis 1.

[table 1]

(embodiment 1~7, comparative example 1~4)

In to the solution containing acrylic polymer obtained above, add relative to its weight portion of nonvolatile component 100 Enter ethyl acetate and be stirred, CORONATE L (the isocyanates systems as crosslinking agent of the ormal weight shown in addition table 2 Crosslinking agent, Nippon Polyurethane CO., Ltd. system), as tackifying resin PENSEL D135 (newtrex ester, Huang Chuan chemical industrial companies system) and YS Polystar G125 (terpenic series tackifying resin, YASUHARA CHEMICAL CO., LTD. make) and be stirred, obtain the binder solution that nonvolatile component is 30 weight %.Thickness be 50 μm through the demoulding at On the PET film of reason, after the mode for turning into 7.5 μm according to paste thickness after drying applies resulting binder solution, at 70 DEG C Dry 10 minutes, obtain double-faced adhesive tape.In addition, on the surface of the both sides of adhesive phase, being laminated for protecting adhesive phase Mold release film.

For resulting double-faced adhesive tape, the small shearing Departure displacement determination test device (rising sun shown in Fig. 1 is used Seiko company system, shear creep determine device, NST1), operate as in the following manner and determine Departure displacement recovery rate.

First, the mold release film in a face of resulting double-faced adhesive tape is peeled off, is attached on the adhesive phase for exposing After implementing polyethylene terephthalate (PET) film of sided corona treatment, cut into 1cm wide × 12cm long and be made test film 5.The thermosistor 4 of device is set as 80 DEG C, is placed at a set temperature to stabilization.(thermosistor is to combine following device To use：Co., Ltd. is high wooden to make institute thermoregulator SA100, model SA100FK08-MN-4 ※ NN-NN；Co., Ltd. is high It is wooden to make institute copper water-cooled peltier unit, model PU-50W；EYELA cooling water circulating devices CoolAce, model C CA1111 Type) another mold release film of test film 5 to be peeled off from end 3cm or so and is removed, the adhesive phase that will expose is according to bonding plane Mode of the product as 1cm × 1cm is attached on adherend 3.Placed on attaching face has carried out the quartz of mirror surface treatment by end face The block 2 (evaporation has the block of chromium on quartz glass) of system, test film 5 is installed on the iron wire on the counterweight 6 for lying in 200g. Under the state place, carry out 5 minutes it is thermostatic.After 5 minutes, the PC that is connected with device of operation and start imposed load, to testing Piece 5 gives 3 minutes shear loads to horizontal direction.Wherein, laser interference is passed through with the Departure displacement amount of deformation of binder 1 (KEYENCE SI-F10) of meter is detected in the form of the amount of movement of the mirror surface treatment quartz wedge 2 on test film 5,3 minutes It is per second all with PC come record value.Load is removed after 3 minutes, the recovery with the Departure displacement of deformation of binder passes through laser interference Meter 1 is detected in the form of the amount of movement of the mirror surface treatment quartz wedge 2 on test film 5, and 3 minutes per second all to be recorded with PC Value.After off-test, based on following calculating formula, calculate " Departure displacement recovery rate ".

Departure displacement recovery rate (%)={ (Departure displacement (μm) of the load load after 3 minutes)-(removing load is after 3 minutes Departure displacement (μm))/(Departure displacement (μm) of the load load after 3 minutes) × 100

(evaluation)

For the adhesive tape obtained in embodiment, comparative example, following evaluations are carried out.In showing the result in table 2.

(1) the optical strain experiment of optical film

The schematic diagram of the test method of the degree of measurement optics membrane strain is illustrated that in Fig. 6.By by shown in Fig. 6 that The test specimen of sample gets off evaluate whether the light caused by temperature change can be relaxed with adhesive phase exposed to hot conditions Learn the dilatation of film.

The mold release film that double-faced adhesive tape will be made to be punched into a face of the test film 20 of 2.5mm border shapes wide is peeled off and removed Go, on the adhesive phase for exposing, fit as shown in Figure 64 inches of window frame, the He of PC frames 21 of frame width 5mm, 100mm × 63mm The BEF sheet materials 22 (TBEF II GMV2 (24)) of 88mm × 51mm.Now, test film 20 and PC frames 21, test film 20 and BEF pieces The respective adhesion width of material 22 is adjusted according to the mode as 1mm.

Then, the mold release film of the opposing face of test film 20 is peeled off and is removed, glass plate of being fitted on the adhesive phase for exposing 23, pasted by placing 10 seconds sliding weight of steelyards of 10Kg.Afterwards, by least quiet under conditions of 23 DEG C, relative humidity 50% Put 24 hours, make test specimen 24.

Test specimen 24 is put into 85 DEG C of baking oven and 96 hours are stood.

Then, recovered at leisure to normal temperature with more than 30 minutes, whether have answering for optical film by following benchmark evaluation Become.

◎：Strain is not seen completely

○：Although seeing strain, image is not influenceed

×：Strain is seen, is had an impact to image

(2) for the permanent load fissility of makrolon (PC) plate

The schematic diagram of the test method of permanent load disbonded test is illustrated that in Fig. 7.As shown in Figure 7, will Resulting double-faced adhesive tape cuts into the strip of 20mm wide × 50mm long and makes test film 31, by mold release film from the experiment The sur-face peeling of piece 31 is removed and exposes adhesive phase, is put according to the mode as opposed state on polycarbonate plate 30 Put adhesive phase.

Then, mold release film is peeled off from the back side of above-mentioned test film 31 and is removed, thickness is laminated on the adhesive phase for exposing After for 23 μm of polyethylene terephthalate films (not shown), the rubber rollers of 2kg are made on the back side of above-mentioned test film 31 One is carried out with the speed of 300mm/ minutes to come and go, so that test film 31 is fitted with polycarbonate plate 30, by 23 DEG C, phase Test specimen 32 is made to standing 24 hours under conditions of humidity 50%.

Then, the test specimen 32 is put into 85 DEG C of baking oven, as shown in Figure 7, in test specimen 32 50g is installed along the mode that the direction vertical relative to adhesive surface applies load according to the test film 31 in one end of test film 31 Sliding weight of steelyard 33, determines the time being fallen from polycarbonate plate 30 to test film 31.Based on resulting measured value, by following Benchmark evaluate permanent load fissility.

○：Lowering time is more than 1 hour

×：Lowering time is less than 1 hour

(3) adhesive tape processability

Resulting double-faced adhesive tape is cut into the border shape of 1mm wide using guillotine.After operation will be cut carrying out 10 times, The blade of guillotine is observed by visual observation, and adhesive tape processability is evaluated according to following benchmark.

◎：The attachment of adhesive is not seen on blade

○：The attachment to cutting the slight adhesive for operating no effect is seen on blade

×：Seen on blade to cutting the attachment that operation produces the adhesive of effect

[table 2]

Industrial applicability

In accordance with the invention it is possible to provide being peeled off with the permanent load high for adherend for the fixation for optical film The optical film fixation double-faced adhesive tape of property, resistance to strain stress high and adhesive tape processability.

The explanation of symbol

1 laser interferometer

2 mirror surface treatment quartz wedges

3 adherends (JIS Z 0237 specify stainless steel)

4 thermosistors

5 test films (double-faced adhesive tape)

6 counterweights

7 adhesive phases

8 remaining demoulding faces

9 sided corona treatment PET film faces

10 mirror surface treatment faces

11 pass through acrylic polymer obtained from active free radical polymerization

111 monomers not comprising cross-linking functional group

112 monomers containing cross-linking functional group

12 by acrylic polymer obtained from free radical polymerization

121 monomers not comprising cross-linking functional group

122 monomers containing cross-linking functional group

123 polymer that end free base inactivation is grown in the way of reaction

124 polymer grown by the new free radical kind for producing in the reaction

20 test films

21 PC frames

22 BEF sheet materials

23 glass plates

24 test specimens

30 PC plates

31 test films

32 test specimens

33 50g sliding weight of steelyards

Claims (2)

1. a kind of optical film fixation double-faced adhesive tape, it is characterised in that be the optics for optical film to be fixed on adherend Film fixation double-faced adhesive tape,

The optical film fixation has the adhesive phase containing acrylic polymer and crosslinking agent with double-faced adhesive tape,

The acrylic polymer is obtained from by active free radical polymerization, also, weight average molecular weight is 500,000~180 Ten thousand, molecular weight distribution is expressed as 1.05~2.5 with Mw/Mn,

The optical film fixation has with double-faced adhesive tape：Apply 3 points at 80 DEG C in small shearing Departure displacement determination test After the load of clock 200g remove load, further across the bonding that the Departure displacement recovery rate measured after 3 minutes is 30~90% Oxidant layer.

2. optical film fixation double-faced adhesive tape according to claim 1, it is characterised in that have：It is inclined in small shearing Off normal move determination test in 80 DEG C apply the 3 minutes load of 200g after remove load, further across 3 minutes after measure it is inclined Off normal move recovery rate be 30~85% adhesive phase.