CN104781359A - Substrate-less double-sided adhesive sheet - Google Patents

Abstract

The invention provides a substrate-less double-sided adhesive sheet suitable for various optical parts such as parts for manufacturing of liquid crystal polarized plates and manufacturing of touch panels in an electrostatic capacity manner. The substrate-less double-sided adhesive sheet (10) in which release films (31, 32) are laminated on each side of an adhesive layer (11) and the peel force of one release film (first release film) (31) is smaller than the peel force of the other release film (second release film) (32), wherein the second release film (32) simultaneously satisfies the following conditions (a) to (c). (a) A release film in which a release layer (25) is provided on a surface of a coating layer (24) which comprises a hydrolytic silicon compound provided on a biaxially oriented polyester film. (b) Variation in the angle of orientation in the film surface of the biaxially oriented polyester film is 6 degrees/500 mm or less. (c) The amount of oligomer extracted from the surface of the release layer (25) of the release film (32) by dimethylformamide is 0.5 mg/m2 or less.

Description

Without base material double-sided adhesive sheet

Technical field

The present invention relates to a kind of without base material double-sided adhesive sheet, well, there is not stripping charge when peeling off mold release film, can peel off with good separability in its static electricity resistance, release property, oligopolymer stopping property, inspection easiness.There is following feature in addition: after coating adhesive, after laminating mold release film, little relative to the stripping variation of bond layer, to the oligopolymer of bond layer transfer, separate out few.For such as liquid crystal polarization plate manufacture with the touch panel manufacture of, capacitance-type with etc. via the various uses of bond layer laminating, provide applicable without base material double-sided adhesive sheet.

Background technology

Conventionally, there is known multiple by carrying out the adhesive sheet of face joint between object, there will be a known without base material double-sided adhesive sheet as one of adhesive sheet.Double-sided adhesive sheet without base material double-sided adhesive sheet is following: there is the multilayer body structure obtained at the light stripping film that the two sides lamination peeling force of adhesive linkage is relatively low high heavy stripping film relative to peeling force, after the stripping film on removing two sides, be only the adhesive linkage without support base material.

As the using method without base material double-sided adhesive sheet, following manufacturing procedure can be illustrated: first peel light stripping film, the adhesive linkage exposed surface is engaged with the object plane of the object of laminating, after this joint, peel heavy stripping film again, engaged from different object plane in another face of exposed adhesive linkage, between object, quilt cover engages thus.

In recent years, without base material double-sided adhesive sheet its workability good in enjoy and gaze at, purposes is constantly widened, various optical applications parts, such as, in portable phone etc. also in use.The particularly touch panel of capacitance-type, by carrying out the multi-point touch operation of screen operation with two fingers, the purposes as intelligent terminal is in the situation expanded rapidly.The touch panel of capacitance-type, compared with resistive film mode, exists and forms the thickening tendency of step difference that is upper, printing, therefore propose and make bond layer thickening and the scheme of the step difference of elimination printing.When making bond layer thickening, when peeling off mold release film, the part producing bond layer is sometimes attached to mold release film or is mixed into the unfavorable conditions such as bubble in the bond layer of part being needed on mold release film.Therefore, when using without base material double-sided adhesive sheet in optical applications, not only without in base material double-sided adhesive sheet, and in the mold release film combined, be also in needs than ever more strictly, the situation of the more mold release film of high-quality.

On the other hand, when using mold release film, when making it peel off from bond layer, there is stripping charge sometimes, its result, in processing site, producing the unfavorable conditions such as the bad generation of goods that the attachment or be involved in because of foreign matter etc. causes sometimes.

Therefore, only with the anti-electrostatic countermeasure corresponding by equipment in manufacturing process, might not be abundant, be in urgent situation of wishing from the anti-electrostatic process of mold release film itself.In addition, in the mold release film of release layer being provided with heavy peel-away type, when peeling off after the state of fitting for a long time with bond layer, there is the tendency of re-separation.As the present invention, in the purposes across bond layer laminating mold release film, when the ratio of peeling force departs from desired scope, when the situation that original needs are peeled off, be peeling the unfavorable conditions such as difficulty sometimes.

In addition, under the state being provided with bond layer on the second mold release film (heavily peeling off side), fit in object Part sometimes, implement the inspection with optical assessment.Now, when the optics by having polarisation effect checks, check that the visual field is dimmed because of angle sometimes.

Prior art document

Patent documentation

Patent documentation 1: Japanese Patent Application 2010-56884 publication

Patent documentation 2: Japanese Patent Application 2010-121101 publication

Patent documentation 3: Japanese Patent Application 2010-97765 publication

Patent documentation 4: Japanese Patent Application 2010-97925 publication

Patent documentation 5: Japanese Patent Application 2010-165733 publication

Patent documentation 6: Japanese Patent Application 2011-48410 publication

Patent documentation 7: Japanese Patent Application 2011-75120 publication

Summary of the invention

Invent problem to be solved

The present invention completes in view of above-mentioned practical situation, it solves problem and is to provide a kind of without base material double-sided adhesive sheet, its be on the two sides of bond layer respectively lamination have mold release film without base material double-sided adhesive sheet, the touch panel parts being suitable as such as capacitance-type use, static electricity resistance, release property, oligopolymer stopping property, check that easiness is good, and mold release film itself has oligopolymer sealing property.

For solving the method for problem

The present inventor conduct in-depth research in view of above-mentioned actual state, found that, according to have specific formation without base material double-sided adhesive sheet, can easily solve above-mentioned problem, thus complete the present invention.The present invention includes 2 inventions of association, the purport of each invention is as follows.

Namely, the purport of the first invention is a kind of without base material double-sided adhesive sheet, it is characterized in that: it is lamination mold release film respectively on the two sides of bond layer, the peeling force of a mold release film (the first mold release film) is less than the peeling force of another mold release film (the second mold release film), and the second mold release film meets the condition of following (a) ~ (c) recorded simultaneously.

A surface that () is the coating layer containing water-disintegrable silicon compound set on biaxially oriented polyester film is provided with the mold release film of release layer.

B the variation of the orientation angle in () above-mentioned biaxially oriented polyester film face is 6 degree/below 500mm.

C oligopolymer amount that () is extracted from the release layer surface of above-mentioned mold release film by dimethyl formamide is 0.5mg/m ²below.

And the purport of the second invention is a kind ofly to it is characterized in that without base material double-sided adhesive sheet, the first purport relate to without in base material double-sided adhesive sheet, the film mist degree of the first mold release film is more than 6%.

The effect of invention

First invention due to static electricity resistance, release property is good and have oligopolymer sealing property, so the touch panel being suitable as such as capacitance-type use without base material double-sided adhesive sheet, the value of its industry is high.Second invention and then check that easiness, identity are good.

Accompanying drawing explanation

Fig. 1 is the schematic sectional view without base material double-sided adhesive sheet representing that embodiments of the present invention relate to.

Embodiment

< first invention >

The polyester film of formation first and second mold release film in the present invention both can be single layer structure also can be rhythmo structure, such as except 2 layers, except 3-tier architecture, as long as be no more than purport of the present invention, can also be 4 layers or its above multilayer, be not particularly limited.

The polyester that in the present invention, polyester film uses can be both homopolymerization polyester, also can be copolyester.When being made up of homopolymerization polyester, preferably make aromatic dicarboxylic acid and aliphatic diol polycondensation and the material obtained.As aromatic dicarboxylic acid, terephthalic acid, 2,6-naphthalene dicarboxylic acids etc. can be enumerated, as aliphatic diol, ethylene glycol, glycol ether, 1,4 cyclohexane dimethanol etc. can be enumerated.Representatively polyester, can illustrate polyethylene terephthalate (PET) etc.On the other hand, as the dicarboxylic acid component of copolyester, m-phthalic acid, phthalic acid, terephthalic acid, 2 can be enumerated, one or two or more kinds in 6-naphthalene dicarboxylic acids, hexanodioic acid, sebacic acid, hydroxycarboxylic acid (such as P-hydroxybenzoic acid etc.) etc., as diol component, one or two or more kinds in ethylene glycol, glycol ether, propylene glycol, butyleneglycol, 1,4 cyclohexane dimethanol, neopentyl glycol etc. can be enumerated.In either event, the said polyester of the present invention refers to that as usual more than 60 % by mole, preferably more than 80 % by mole be the polyester of the polyethylene terephthalate of ethylene glycol terephthalate unit etc.

In the present invention, preferably in polyester layer, coordinate particle to give easy slip as main purpose.As long as the kind of the particle coordinated is that the particle can giving easy slip is just not particularly limited, as concrete example, can enumerate such as: the particle of silicon-dioxide, calcium carbonate, magnesiumcarbonate, barium carbonate, calcium sulfate, calcium phosphate, trimagnesium phosphate, kaolin, aluminum oxide, titanium oxide etc.In addition, the thermotolerance organic granular recorded in Japanese Patent Publication 59-5216 publication, Japanese Laid-Open Patent Publication 59-217755 publication etc. can also be used.As the example of other thermotolerance organic granular, thermoset urea resin, heat-reactive phenolic resin, thermosetting epoxy resin, benzoguanamine resin etc. can be enumerated.In addition, also can be used in polyester manufacturing process and make that a part for the metallic compounds such as catalyzer precipitates, differential falls apart the precipitate particle obtained.

On the other hand, be also not particularly limited about the shape of particle used, the arbitrary shapes such as spherical, block, bar-shaped, flats can be used.In addition, be also not particularly limited about its hardness, proportion, color etc.Also two or more kinds may be used as required for these a series of particles.

In addition, the median size of the particle of use is generally 0.01 ~ 3 μm, is preferably the scope of 0.01 ~ 1 μm.When median size is less than 0.01 μm, particle is easy to aggegation, sometimes dispersed insufficient, and on the other hand, when median size is more than 3 μm, the surfaceness of film becomes too thick, produces unfavorable condition sometimes when being coated with release layer in subsequent handling etc.

In addition, the granule content in polyester layer is generally 0.001 ~ 5 % by weight, is preferably the scope of 0.005 ~ 3 % by weight.When granule content is less than 0.001 % by weight, the easy slip of film is insufficient sometimes, and on the other hand, when interpolation is more than 5 % by weight, the transparency of film is insufficient sometimes.

As the method for adding particle in polyester layer, be not particularly limited, existing known method can be adopted.Such as, can add in any stage manufacturing the polyester forming each layer, but preferably after the stage of esterification or transesterification reaction terminate, polycondensation can be carried out.

In addition, can carry out by the following method, that is, use the mixing extruder with ventilation opening, by the slurry of particle that is dispersed in ethylene glycol or water etc. and the method for polyester raw material blending; Or use mixing extruder, by the method etc. of dried particle and polyester raw material blending.

In addition, in polyester film of the present invention except above-mentioned particle, existing known antioxidant, antistatic agent, thermo-stabilizer, lubricant, dyestuff, pigment etc. can also be added as required.

As long as the thickness forming the polyester film of the first mold release film of the present invention and the second mold release film can the scope of masking just be not particularly limited as film, the scope be generally 25 ~ 250 μm, being preferably 38 ~ 188 μm, being more preferably 50 ~ 125 μm.

Then, the Production Example for polyester film of the present invention is described particularly, but not by the following any restriction of Production Example.

The polyester raw material described before preferably first using, obtains the method for non-drawing sheet by the molten sheet cooling roller cooling curing extruded from die head.Now, in order to make the planarity of sheet improve, needing improved sheet and the adaptation rotating drum cooler, preferably adopting electrostatic to apply closely sealed method and/or the closely sealed method of liquid spreading.Then obtained non-drawing sheet is stretched on biaxially oriented.Now, first, above-mentioned non-drawing sheet is stretched with the drawing machine of roller or tenter machine mode in one direction.Draft temperature is generally 70 ~ 120 DEG C, and be preferably 80 ~ 110 DEG C, stretching ratio is generally 2.5 ~ 7 times, is preferably 3.0 ~ 6 times.Then, the draft temperature orthogonal with first paragraph draw direction is generally 70 ~ 170 DEG C, and stretching ratio is generally 3.0 ~ 7 times, is preferably 3.5 ~ 6 times.Then, continue to heat-treat under to strain within lower or 30% lax with the temperature of 180 ~ 270 DEG C, obtain Biaxially oriented film.In above-mentioned stretching, also can adopt the method for the stretching more than 2 stages to carry out a direction.Now, the mode preferably becoming above-mentioned scope respectively with the stretching ratio of final both direction is carried out.

In addition, about the polyester film manufacture in the present invention, biaxial stretching process simultaneously also can be adopted.With regard to while biaxial stretching process with regard to, utilize and be controlled as usual 70 ~ 120 DEG C in temperature, preferably above-mentioned non-drawing sheet stretched on operating direction and width under the state of 80 ~ 110 DEG C simultaneously and make the method for its orientation, as stretching ratio, with area dynameter, it is 4 ~ 50 times, be preferably 7 ~ 35 times, be more preferably 10 ~ 25 times.Then, continue to heat-treat under to strain within lower or 30% lax with the temperature of 170 ~ 250 DEG C, obtain stretch orientation film.About biaxial stretch-formed device while the above-mentioned stretching mode of employing, the known stretching mode all the time such as spiral way, scalable manner, linear drive mode can be adopted.

In addition, can implement to process in the stretching process of above-mentioned polyester film film surface, so-called coating stretching method (applying online).When arranging coating layer by coating stretching method on polyester film, can be coated with stretching, and it is thinning to make the thickness of coating layer correspond to stretching ratio, can manufacture as the suitable film of polyester film simultaneously.

Be described about the coating layer forming mold release film of the present invention.

Form the coating layer of mold release film of the present invention, separate out preventive to make static electricity resistance, oligopolymer and become good, and make release layer and polyester film through time film adaptation become good, using containing water-disintegrable silicon compound as prerequisite.

As water-disintegrable silicon compound used in the present invention, use general formula Si (OR ¹) _x(R ²) _4-xshown material is preferred in purposes of the present invention.In above-mentioned general formula, x is preferably the integer of 2 ~ 4.R in above-mentioned general formula ¹can be any one of alkyl or acyl group.As alkyl, can enumerate such as: the alkyl of the carbonatomss 1 ~ 5 such as methyl, ethyl, n-propyl, sec.-propyl, normal-butyl, sec-butyl, the tertiary butyl, can enumerate such as acyl group: the acyl group of the carbonatomss such as ethanoyl 1 ~ 4.In above-mentioned general formula, R ²for the organic group of carbonatoms 1 ~ 10, such as, be without the alkyl replaced or replace.As without the alkyl replaced, can enumerate: the thiazolinyls etc. such as the aryl such as alkyl, phenyl, vinyl, allyl group such as methyl, ethyl, n-propyl, sec.-propyl, normal-butyl, the tertiary butyl, n-hexyl, cyclohexyl, n-octyl, tertiary octyl group, positive decyl.In addition, alternatively alkyl, can enumerate: γ-glycidoxypropyl group, γ-mercaptopropyi, 3,4-epoxycyclohexylethyl, gamma-methyl allyl acyloxypropyl etc.These water-disintegrable silicon compounds both can be used alone, or also can combine two or more and also use.

As the concrete example of the water-disintegrable silicon compound of x=4, can illustrate: tetramethoxy-silicane, tetraethoxysilane, four positive propoxy silane, four n-butoxy silane, four acetoxysilanes etc.As the concrete example of x=3, can enumerate: methyltrimethoxy silane, Union carbide A-162, ethyl trimethoxy silane, ethyl triethoxysilane, n-propyl Trimethoxy silane, n-propyl triethoxyl silane, isopropyltri-methoxysilane, isopro-pyltriethoxysilane, γ-r-chloropropyl trimethoxyl silane, γ-chloropropyl triethoxysilane, γ-glycidoxypropyltrime,hoxysilane, γ-glycidoxypropyl group triethoxyl silane, gamma-methyl allyl acyloxypropyl trimethoxysilane, γ-Mercaptopropyltriethoxysilane, phenyltrimethoxysila,e, vinyltriethoxysilane, 3, 4-epoxycyclohexylethyl Trimethoxy silane, 3, 4-epoxycyclohexylethyl triethoxyl silane etc.As the alkoxysilane compound containing trialkylsilyl group in molecular structure of x=2, can illustrate: dimethyldimethoxysil,ne, dimethyldiethoxysilane, aminomethyl phenyl dimethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, diη-propyl dimethoxysilane, diη-propyl diethoxy silane, diisopropyl dimethoxy silane, diisopropyldiethoxysilane, dimethoxydiphenylsilane, divinyl diethoxy silane etc.

In addition, as the material forming coating layer of the present invention, in order to make oligopolymer stopping property more good, preferably also use containing metal organic clement compound.

Specifically, in coating layer containing more than at least a kind containing metal organic clement compound be selected from aluminium, titanium, zirconium.

As the concrete example of organic compound with aluminium element, can illustrate: aluminium tris(acetylacetonate), aluminium single acetyl acetone solvate two (methyl aceto acetate), aluminium-two positive fourth oxide compound-etheric acid mono ethyl ester, aluminium-diisopropyl oxide compound-etheric acid mono-methyl etc.

As the concrete example of organic compound with titanium elements, can enumerate such as: the titanium ortho ester class such as tetra-n-butyl titanate, titanium isopropylate, butyltitanate dimer, four (2-ethylhexyl) titanic acid ester, metatitanic acid four methyl esters; The titanium chelate classes etc. such as Acetyl Acetone titanium, tetra-acetylated acetone titanium, poly-titanium acetylacetonate, ethohexadiol titanium, lactic acid titanium, titanium trolamine compound, ethyl acetoacetic acid titanium.

As the concrete example of organic compound with zr element, can enumerate such as: zirconium acetate, n Propanoic acid zirconium, butanic acid zirconium, zirconium, monoacylphosphine acetone zirconium, diacetyl group acetone zirconium etc.

Wherein, particularly oligopolymer separate out prevent of good performance in, the organic compound preferably containing the metallic element be selected from aluminium, zirconium, more preferably has the organic compound of chelate structure.In addition, in " frame Bridge agent Ha Application De Block ッ Network (linking agent handbook) " (Shanxi three, gold east help editor's (strain) great achievement society Heisei 2 years versions under mountain), concrete record is also had.

In the coating layer forming mold release film of the present invention, preferably in making oligopolymer stopping property become good, preferred mixed hydrolysis silicon compound (A) and containing metal organic clement compound (B).Both compounding ratios (weight ratio) are preferably (A): the scope of (B)=1:0.001 ~ 1:0.01.When departing from this scope, the surperficial intrinsic resistance (R) on the release layer surface sometimes in mold release film does not reach desired level or can produce the unfavorable conditions such as oligopolymer sealing property is not enough.

Then the formation for release layer of the present invention is described.

The release layer forming the first mold release film of the present invention and the second mold release film refers to the layer with release property, specifically, can complete the present invention by making the peeling force of acrylic acid series splicing tape and release layer (F) in certain limit.

What be equivalent to the first mold release film 31 gently peeling off side is preferably 5 ~ 40mN/cm relative to the peeling force of adhesive linkage 11.When the peeling force of the first mold release film is less than 5mN/cm, under the situation originally not needing to peel off, mold release film can easily be peeled off sometimes.In addition, when the peeling force of the first mold release film is more than 40mN/cm, in the operation of stripping first mold release film, sometimes can be called as the peeling of floating between the second mold release film and adhesive linkage.

Suppress lower by the absolute value of the peeling force by the first mold release film 31, even if reduce the absolute value of the peeling force of the second mold release film 32, the peeling force that also can increase two mold release film 31,32 is poor.In addition, by making the peeling force of the first mold release film 31 be more than certain value, before use, under originally not needing the situation peeled off, the first mold release film 31 can be prevented from the phenomenon that adhesive linkage 11 is easily peeled off or the first mold release film 31 is floated from adhesive linkage 11.

On the other hand, the peeling force being equivalent to the second mold release film 32 heavily peeling off side is preferably 45 ~ 100mN/cm, is more preferably 50 ~ 80mN/cm.When the peeling force of the second mold release film is lower than 45mN/cm, when stripping the first mold release film, produce the unfavorable conditions such as the part stripping of the second mold release film sometimes.In addition, when the peeling force of the second mold release film is more than 100mN/cm, produces sometimes and remain the unfavorable condition such as composition from adhesive linkage in the second mold release film.

Of the present invention without base material double-sided adhesive sheet except above-mentioned peeling force adjustment except, the peeling force also preferably arranging the first mold release film and the second mold release film is poor.

Preferably the peeling force of the second mold release film 32 is usual more than 2.0 times of the peeling force of the first mold release film 31, is preferably set to more than 3.0 times.During 2.0 times of peeling force lower than the first mold release film 31 of the peeling force of the second mold release film 32, peel off light peel off the first mold release film 31 of side time, there is phenomenon that the second mold release film 32 floats from bond layer 11, adhesive linkage composition sometimes to unfavorable conditions such as the residual of the second mold release film 32 or discontinuous strippings (Zipping).

The release layer forming the first mold release film of the present invention also can be arranged on polyester film by above-mentioned coating stretching method (applying online).Be not limited to following methods about coating stretching method (online apply), such as can in successively biaxial stretch-formed particularly the stretching of the 1st section terminate, implement coating processing before the stretching of the 2nd section.When arranging release layer by coating stretching method on polyester film, can be coated with stretching, and it is thinning to make the thickness of release layer correspond to stretching ratio, makes as the suitable film of polyester film simultaneously.

In addition, the release layer forming mold release film of the present invention becomes good to make release property, preferably containing curing type silicone resin.Both can be the type that is main component with curing type silicone resin, also in the scope not damaging purport of the present invention, the modified organic silicon type etc. obtained by graft polymerization with organic resins such as urethane resin, epoxy resin, Synolac etc. can be used.

As the kind of curing type silicone resin, any curing reaction type such as add-on type, condensed type, ultraviolet hardening, electronic beam solidified, no-solvent type can both use.Enumerate concrete example, then can illustrate: SHIN-ETSU HANTOTAI's chemical industry (strain) KS-774 processed, KS-775, KS-778, KS-779H, KS-847H, KS-856, X-62-2422, X-62-2461, X-62-1387, X-62-5039, X-62-5040, KNS-3051, X-62-1496, KNS320A, KNS316, X-62-1574A/B, X-62-7052, X-62-7028A/B, X-62-7619, X-62-7213, Momentive Performance Materials Inc. YSR-3022, TPR-6700, TPR-6720, TPR-6721, TPR6500, TPR6501, UV9300, UV9425, XS56-A2775, XS56-A2982, UV9430, TPR6600, TPR6604, TPR6605, Dow Corning Toray Co., Ltd. (Dong Li Dow Corning Corporation) SRX357 processed, SRX211, SD7220, SD7292, LTC750A, LTC760A, LTC303E, SP7259, BY24-468C, SP7248S, BY24-452, DKQ3-202, DKQ3-203, DKQ3-204, DKQ3-205, DKQ3-210 etc.And then in order to adjust the separability etc. of release layer, also can be used together release control agent.

In the present invention, be not particularly limited about condition of cure when forming release layer on polyester film, when arranging release layer by coated off-line, usually with 120 ~ 200 DEG C, 3 ~ 40 seconds, preferably with 100 ~ 180 DEG C, 3 ~ 40 seconds for standard is heat-treated.In addition, also can also irradiate with thermal treatment and uviolizing isoreactivity energy line as required.In addition, as utilizing active energy ray to irradiate the energy source be cured, known device, energy source all the time can be used.The coating amount (after dry) of release layer, from the aspect of screening characteristics, is generally 0.005 ~ 1g/m ², be preferably 0.005 ~ 0.5g/m ², be more preferably 0.01 ~ 0.2g/m ²scope.Coating amount (after dry) is lower than 0.005g/m ²time, deficient in stability viewed from the aspect of screening characteristics, is difficult to obtain uniform film sometimes.On the other hand, in thick painting more than 1g/m ²time, the film adaptation, solidified nature etc. of release layer itself can reduce sometimes.

Second mold release film of the present invention needs the variation of the orientation angle in film to be 6 degree/below 500mm.When the variation of orientation angle is greater than 6 degree/500mm, this purposes can be not suitable for.

In the present invention, as the method arranging release layer at polyester film, the existing known application pattern such as the coating of reverse intaglio plate, directly intaglio plate coating, roller coat, mould painting, rod painting, curtain coating can be used.About application pattern at “ コ ー テ ィ Application グ mode (coating method) " example on the books in the distribution in 1979 of the former rugged brave time work of Omaki bookstore.

About the first mold release film of the present invention and the second mold release film, the face of release layer be not set, in the scope not damaging purport of the present invention, the coating layers such as knitting layer, antistatic backing, oligopolymer precipitation preventing layer also can be set.

In addition, also the surface treatment such as corona treatment, Cement Composite Treated by Plasma can be implemented in advance to the polyester film of formation first mold release film and the second mold release film.

In the present invention, when manufacturing mold release film, both after can being coated with coating layer on polyester film, again release layer is set on coating layer after at one end being rolled by film, also can be coated with after coating layer carries out drying on polyester film, continuously release layer is set on coating layer, in the present invention, any one method can be used.

In the formation mold release film without substrate bonding sheet of the present invention, from the view point of the foreign matter attachment prevented to bond layer surface or stripping electrostatic, surperficial intrinsic resistance (R) value of stripping surface is preferably 1 × 10 ¹²(Ω) below.About R value, be preferably 1 × 10 ¹¹(Ω) below, 1 × 10 is more preferably ¹⁰(Ω) below.When R departs from above-mentioned scope, sometimes can produce when peeling off mold release film unfavorable conditions such as being involved in foreign matter.

In addition, in mold release film of the present invention, (180 DEG C, 10 minutes) after preferred thermal treatment, from the oligopolymer amount (OL) of release layer surface extraction be 0.5mg/m ²below.OL is more than 0.5mg/m ²time, when the stripping surface of mold release film and bond layer are fitted, oligopolymer through time separate out, with optical assessment inspection operation in, sometimes check time can bring obstacle.

Then, the formation bond layer without base material double-sided adhesive sheet of the present invention is below described.Bond layer in the present invention refers to the layer be made up of the material with cementability, in the scope not damaging purport of the present invention, can use known material all the time.As one of concrete example, be described following for using the situation of acrylic acid series caking agent.

In the present invention, acrylic acid series caking agent refers to containing using acrylic monomer as must the bond layer of polymkeric substance based on the acrylic acid polymer that formed of monomer (Monomer) composition.This acrylic acid polymer is preferably using the acrylic acid polymer that (methyl) alkyl acrylate and/or (methyl) alkoxyalkyl acrylate with the alkyl of straight or branched are formed as necessary monomer component (more preferably as main monomer component).In addition, acrylic acid polymer is preferably using the acrylic acid polymer that (methyl) alkyl acrylate and alkoxyalkyl acrylate with the alkyl of straight or branched are formed as necessary monomer component.

Bond layer of the present invention is preferably using the acrylic acid series bond layer that (methyl) alkyl acrylate and alkoxyalkyl acrylate with the alkyl of straight or branched are formed as necessary monomer component.

In addition, in the monomer component of acrylic acid polymer forming polymkeric substance based in bond layer of the present invention, also can also contain the monomer of polar functionalities, multi-functional monomer, other co-polymerized monomers as comonomer components.In addition, above-mentioned " (methyl) vinylformic acid " expression " vinylformic acid " and/or " methacrylic acid ", other too.In addition, be not particularly limited, based on the acrylic acid polymer of the polymkeric substance content in bond layer of the present invention be preferably more than 60 % by weight relative to the gross weight (100 % by weight) of bond layer, be more preferably more than 80 % by weight.

As the monomer component forming aforesaid propylene acid based polymer, (methyl) alkyl acrylate of the alkyl with straight or branched (following, sometimes only referred to as " (methyl) alkyl acrylate ") can be used suitably.As the concrete example of above-mentioned (methyl) alkyl acrylate, can illustrate: (methyl) methyl acrylate, (methyl) ethyl propenoate, (methyl) propyl acrylate, (methyl) isopropyl acrylate, (methyl) butyl acrylate, (methyl) isobutyl acrylate, (methyl) sec-butyl acrylate, (methyl) tert-butyl acrylate, (methyl) amyl acrylate, (methyl) isoamyl acrylate, (methyl) Ethyl acrylate, (methyl) heptylacrylate, (methyl) Octyl acrylate, (methyl) 2-EHA, (methyl) Isooctyl acrylate monomer, (methyl) vinylformic acid ester in the ninth of the ten Heavenly Stems, (methyl) vinylformic acid ester in the different ninth of the ten Heavenly Stems, (methyl) decyl acrylate, (methyl) isodecyl acrylate, (methyl) vinylformic acid undecyl ester, (methyl) dodecylacrylate, (methyl) tridecyl acrylate, (methyl) vinylformic acid tetradecyl ester, (methyl) vinylformic acid pentadecyl ester, (methyl) aliphatic acrylate, (methyl) vinylformic acid heptadecyl ester, (methyl) octadecyl acrylate, (methyl) vinylformic acid nonadecyl ester, the carbonatoms of the alkyl such as (methyl) vinylformic acid eicosyl ester is (methyl) alkyl acrylate etc. of 1 ~ 20.In addition, (methyl) alkyl acrylate may be used singly or in combination of two or more kinds.Wherein, the carbonatoms of preferred alkyl is (methyl) alkyl acrylate of 2 ~ 14, and more preferably the carbonatoms of alkyl is (methyl) alkyl acrylate of 2 ~ 10.

As the monomer of above-mentioned polar functionalities, can enumerate such as: carboxyl group-containing monomer or its acid anhydrides (maleic anhydride etc.) such as (methyl) vinylformic acid, methylene-succinic acid, toxilic acid, fumaric acid, β-crotonic acid, iso-crotonic acid; Hydroxyl (hydroxyl) monomers such as (methyl) hydroxyalkyl acrylates, vinyl alcohol, vinyl carbinol such as (methyl) vinylformic acid 2-hydroxy methacrylate, (methyl) vinylformic acid 3-hydroxy propyl ester, (methyl) vinylformic acid 4-hydroxybutyl, the own ester of (methyl) vinylformic acid 6-hydroxyl; The amide-containing monomers such as (methyl) acrylamide, N, N-dimethyl (methyl) acrylamide, N-methylol (methyl) acrylamide, N-methoxymethyl (methyl) acrylamide, N-butoxymethyl (methyl) acrylamide, N-hydroxyethyl acrylamide; The emulsion stabilities such as (methyl) acrylate, (methyl) acrylate, (methyl) tbutylaminoethylacrylate; (methyl) glycidyl acrylate, (methyl) vinylformic acid methylglycidyl esters etc. are containing glycidyl monomer; The cyano-containing such as vinyl cyanide or methacrylonitrile monomer; NVP, (methyl) acryloyl morpholine and N-vinyl pyridine, N-vinylpiperidone, N-vinyl pyrimidine, N-vinyl piperazine, N-vinyl pyrrole, N-vinyl imidazole, N-second alkene base oxazole etc. are containing the ethene base system monomer of heterocycle; Sodium vinyl sulfonates etc. are containing sulfonic group monomer; The phosphorous acid-based monomers such as 2-hydroxyethyl acryloyl phosphate; N-cyclohexylmaleimide, isopropylmaleimide etc. are containing imido grpup monomer; 2-methylacryoyloxyethyl isocyanic ester etc. are containing isocyanate group monomer etc.The monomer of above-mentioned polar functionalities also can be used alone or in combination of two or more kinds.

As above-mentioned multi-functional monomer, can enumerate such as: hexylene glycol two (methyl) acrylate, butyleneglycol two (methyl) acrylate, (gathering) ethylene glycol bisthioglycolate (methyl) acrylate, (gathering) propylene glycol two (methyl) acrylate, neopentyl glycol two (methyl) acrylate, tetramethylolmethane two (methyl) acrylate, tetramethylolmethane three (methyl) acrylate, Dipentaerythritol six (methyl) acrylate, trimethylolpropane tris (methyl) acrylate, tetramethylol methane three (methyl) acrylate, allyl group (methyl) acrylate, vinyl (methyl) acrylate, Vinylstyrene, epoxy acrylate, polyester acrylate, urethane acrylate etc.Above-mentioned multi-functional monomer also can be used alone or in combination of two or more kinds.

The content of above-mentioned multi-functional monomer is preferably less than 0.5 % by weight relative to the monomer component 100 % by weight forming acrylic acid polymer.When this content is more than 0.5 % by weight, the cohesive force of such as bond layer becomes too high, and stress relaxation can reduce sometimes.

In addition, as the co-polymerized monomer (other co-polymerized monomer) beyond the monomer of above-mentioned polar functionalities and multi-functional monomer, can enumerate such as: (methyl) vinylformic acid cyclopentyl ester, (methyl) cyclohexyl acrylate, (methyl) acrylate or (methyl) phenyl acrylate etc. that (methyl) isobornyl acrylate etc. has ester ring type alkyl have above-mentioned (methyl) alkyl acrylate such as (methyl) acrylate of aromatic hydrocarbyl, (methyl) alkoxyalkyl acrylate, (methyl) acrylate beyond the monomer of polar functionalities and multi-functional monomer, the vinyl ester such as vinyl-acetic ester, propionate, the aromatic ethenyl compound such as vinylbenzene, Vinyl toluene, alkene or the dienes such as ethene, divinyl, isoprene, iso-butylene, the vinyl ethers such as vinyl alkyl ethers, vinylchlorid etc.

Above-mentioned monomer component can utilize all the time known or usual polymerization process to carry out being polymerized preparing by aforesaid propylene acid based polymer.As the polymerization process of acrylic acid polymer, can enumerate such as: solution polymerization process, emulsion polymerisation process, bulk polymerization method or the polymerization process (active energy ray polymerization process) etc. utilizing active energy ray to irradiate.Among above-mentioned, from aspects such as the transparency, water tolerance, manufacturing costs, preferred solution polymerization process, active energy ray polymerization process.

As the active energy ray irradiated when above-mentioned active energy ray is polymerized (photopolymerization), can enumerate such as: the ionization such as α line, β line, γ line, neutron line, electron beam property radioactive rays or ultraviolet etc., wherein, ultraviolet is applicable in purposes of the present invention.In addition, as long as the irradiation energy of active energy ray, irradiation time, illuminating method etc. are in the scope not damaging purport of the present invention, be just not particularly limited.

In addition, when above-mentioned solution polymerization, various general solvent can be used.As such solvent, can enumerate: the ester such as ethyl acetate, n-butyl acetate class; Toluene, benzene etc. are aromatic hydrocarbon based; The aliphatic hydrocarbon such as normal hexane, normal heptane; The ester ring type such as hexanaphthene, methylcyclohexane hydro carbons; The organic solvents such as the ketone such as methylethylketone, methyl iso-butyl ketone (MIBK).Solvent can be used alone or in combination of two or more kinds.

When preparing above-mentioned acrylic acid polymer, the polymerization starter such as thermal polymerization, Photoepolymerizationinitiater initiater (light trigger) can be used according to the kind of polyreaction.Polymerization starter also can be used alone or in combination of two or more kinds.

About above-mentioned Photoepolymerizationinitiater initiater, be not particularly limited, benzoin ether system Photoepolymerizationinitiater initiater, methyl phenyl ketone system Photoepolymerizationinitiater initiater, alpha-ketol system Photoepolymerizationinitiater initiater, aromatic sulfonyl system Photoepolymerizationinitiater initiater, photolytic activity oxime system Photoepolymerizationinitiater initiater, bitter almond oil camphor system Photoepolymerizationinitiater initiater, benzyl system Photoepolymerizationinitiater initiater, benzophenone series Photoepolymerizationinitiater initiater, ketal system Photoepolymerizationinitiater initiater, thioxanthone system Photoepolymerizationinitiater initiater etc. can be used.About the usage quantity of Photoepolymerizationinitiater initiater, as long as in the scope not damaging purport of the present invention, be just not particularly limited, such as, be the scope of 0.01 ~ 0.2 weight part relative to monomer component total amount 100 weight part forming acrylic acid polymer.

As the concrete example of benzoin ether system Photoepolymerizationinitiater initiater, can enumerate such as: benzoin methylether, ethoxybenzoin, bitter almond oil camphor propyl ether, benzoin iso-propylether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-ketone, methyl-phenoxide methyl ether etc.As methyl phenyl ketone system Photoepolymerizationinitiater initiater, can enumerate such as: 2,2-diethoxy acetophenone, 2,2-dimethoxy-2-phenyl acetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, 4-(tertiary butyl) dichloroacetophenone etc.As alpha-ketol system Photoepolymerizationinitiater initiater, can enumerate such as: 2-methyl-2-hydroxypropiophenonepreparation, 1-[4-(2-hydroxyethyl) phenyl]-2-methylpropane-1-ketone etc.As the concrete example of aromatic sulfonyl system Photoepolymerizationinitiater initiater, 2-naphthalic sulfonic chloride etc. can be enumerated.As photolytic activity oxime system Photoepolymerizationinitiater initiater, can enumerate such as: 1-phenyl-1,1-pentanedione-2-(adjacent ethoxy carbonyl)-oxime etc.Bitter almond oil camphor system Photoepolymerizationinitiater initiater comprises such as bitter almond oil camphor etc.Benzyl system Photoepolymerizationinitiater initiater comprises such as benzyl etc.As the concrete example of benzophenone series Photoepolymerizationinitiater initiater, can illustrate: benzophenone, benzoyl phenylformic acid, 3,3 '-dimethyl-4-methoxy benzophenone, polyvinyl benzophenone, Alpha-hydroxy cyclohexyl-phenyl ketone etc.As the concrete example of ketal system Photoepolymerizationinitiater initiater, comprise benzyl dimethyl ketal etc.As the concrete example of thioxanthone system Photoepolymerizationinitiater initiater, comprise thioxanthone, 2-chlorothiaxanthenone, 2-methyl thioxanthone, 2,4-dimethyl thioxanthones, isopropyl thioxanthone, 2,4-di-isopropyl thioxanthones, dodecyl thioxanthone etc.

As the concrete example of above-mentioned thermal polymerization, can enumerate: azo system polymerization starter [such as, 2, 2 '-azobis isobutyronitrile, 2, two-2-the methylbutyronitrile of 2 '-azo, 2, two (2 Methylpropionic acid) dimethyl ester of 2 '-azo, 4, two-4-the cyanopentanoic acid of 4 '-azo, the two isovaleronitrile of azo, 2, two (2-amidine propane) dihydrochloride of 2 '-azo, 2, two [2-(5-methyl-2-tetrahydroglyoxaline-2-base) propane] dihydrochloride of 2 '-azo, 2, two (the 2-methyl-prop amidine) dithionate of 2 '-azo, 2, two (the N of 2 '-azo, N '-dimethyleneisobutylamidine) dihydrochloride etc.], peroxidation system polymerization starter (such as, dibenzoyl peroxide, the peroxidation toxilic acid tert-butyl ester etc.), reducto oxydative system polymerization starter etc.As the usage quantity of thermal polymerization, as long as in the scope not damaging purport of the present invention, be just not particularly limited.

In the acrylic acid series bond layer that a kind of mode as bond layer of the present invention uses, as required, the known additives such as linking agent, crosslinking accelerator, bonding imparting agent (such as, rosin derivative resin, polyterpene resin, petroleum resin, soluble phenolic resin etc.), antiaging agent, weighting agent, tinting material (pigment or dyestuff etc.), UV light absorber, antioxidant, chain-transfer agent, softening agent, tenderizer, tensio-active agent, antistatic agent can be used with the scope not damaging characteristic of the present invention.In addition, when forming bond layer, various general solvent can also be used.As the kind of solvent, be not particularly limited, the material etc. illustrated in solvent used in above-mentioned solution polymerization can be used as.

Above-mentioned linking agent, by being cross-linked by the base polymer of bond layer, can control the gel fraction of bond layer.As linking agent, except isocyanate-based linking agent, epoxy linking agent, melamine series linking agent, peroxidation system linking agent, Urea Series linking agent, metal alkoxide system linking agent, metal-chelating system linking agent, metal-salt system linking agent, carbodiimide system linking agent, oxazoline system linking agent, aziridine system linking agent, amine system linking agent etc. can also be enumerated, isocyanate-based linking agent, epoxy linking agent can be used suitably.Linking agent also can be used alone or in combination of two or more kinds.

Then of the present invention without in base material double-sided adhesive sheet, as its Component units, when using acrylic acid series adhesive composite when forming bond layer, such as, by optics will be present in (such as, sealer, the display surface etc. of touch panel and image-display units) between space specific refractory power replace closer to the transparent adhesive sheet of optics compared with air, photopermeability is improved, suppress the brightness of image display device, the reduction of contrast gradient, when considering foregoing, preferably flexibly design bond layer itself.Such as, the store elastic modulus (G`) of dynamic viscoelastic is preferably 1.0 × 10 <sup>5</sup>below Pa, is more preferably 5.0 × 10 <sup>4</sup>below Pa.In store elastic modulus (G`) more than 1.0 × 10 ⁵such as, during Pa, when landfill is present in the space between optics, the bond layer sometimes producing filling cannot arrive corner, peels off or produce unfavorable conditions such as floating in end.

As the thickness forming the bond layer without base material double-sided adhesive sheet of the present invention, can be 25 μm ~ 200 μm, be preferably the scope of 50 μm ~ 150 μm.When this thickness of adhibited layer is below 25 μm, such as, the space produced between optics becomes excessive, is sometimes difficult to be filled into corner at bond layer.On the other hand, when bond layer thickness is more than 200 μm, compared to the space produced between optics, bond layer thickness becomes blocked up, and the bond layer composition that redundance occurs sometimes is from the unfavorable condition such as oozing out between optics.

< second invention >

The film mist degree of the first mold release film, compared with the first above-mentioned invention, for making to become easy viewpoint from the identification of outside, is being only more than 6% different in constitutive requirements by the present invention.The film mist degree of the first mold release film is preferably more than 10%.This film mist degree lower than 6% time, from without base material double-sided adhesive sheet peel off mold release film time, misunderstand sometimes.

Embodiment

Below, illustrate in greater detail the present invention according to embodiment, the present invention only otherwise exceed its purport, is just not limited to following embodiment.In addition, the assay method used in the present invention is as follows.

(1) mensuration of the intrinsic viscosity of polyester:

Accurate weighing removes the polyester 1g after other non-compatibility in the polyester component of polymer and pigment, and the mixed solvent 100ml adding phenol/tetrachloroethane=50/50 (weight ratio) makes it dissolve, and measures at 30 DEG C.

(2) median size (d ₅₀: μm) mensuration:

Centrifugal type particle size distribution device (Shimadzu Scisakusho Ltd SA-CP3 type) will be used to measure the value of accumulative (weight basis) 50% in the spherical distribution of equivalence obtained as median size.

The film mist degree of (3) first mold release film measures:

According to JIS-K6714, Japanese electricity Se Industrial Co., Ltd system point ball turbidometer NDH-20D is utilized to measure film mist degree (turbidity).

(4) mensuration of the variation of the orientation angle in main axis of orientation and film:

Position centered by the width of the polyester film relative to formation second mold release film, towards two ends, the position of every 500mm and cut out sample from most two ends, use Carl Zeiss Inc. polarizing microscope respectively, observe the orientation of polyester film, the direction obtaining the main axis of orientation in polyester face to have tilted how many degree relative to the MD of polyester film.In addition, measure on, main axis of orientation more than 90 degree time, using the angle of its supplementary angle as the MD direction relative to main axis of orientation.In addition, when the variation of orientation angle calculating the position comprising most two ends, when between sample position less than 500mm, the variation of the orientation angle of every 500mm is calculated with ratio.Obtain the variation of the orientation angle of every 500mm of width like this, the orientation angle of mean value as the width of each film is changed.

(determinating reference)

The variation of A orientation angle is 6 degree/below 500mm.

The variation of B orientation angle is more than 6 degree/500mm.

The mensuration postponed in the face of (5) second mold release film:

Thickness of liquid crystal box (cell gap) the inspection units RETS-1100A of Shi Yong Otsuka Electronics Co., Ltd., postpones in the face measuring the position centered by relative to film width.Use optical interferometry in the mensuration postponed in the face of film, be set to aperture 5mm and carry out at 23 DEG C.

(6) peeling force (F1F2) of mold release film measures:

After the release layer surface of sample film attaches a face of double-sided adhesive tape (day east electrician's system " No.502 "), cut into the size of 50mm × 300mm, be determined at room temperature place 1 hour after peeling force.Peeling force uses tensile testing machine ((strain) Intesco system " Intesco model2001 type "), under the condition of draw speed 300mm/ minute, carries out 180 ° of strippings.

(7) the surperficial intrinsic resistance (R) of mold release film measures:

In sample film, measure the surperficial intrinsic resistance (R) of stripping surface, judge according to following determinating reference.Condition determination 23 DEG C, carry out under the atmosphere of 50%RH.By the medial electrode 50mm diameter of Yokogawa Hewlett-Packard, the concentric electrode 16008A (trade(brand)name) of lateral electrode 70mm diameter 23 DEG C, be arranged at sample under the atmosphere of 50%RH, apply the voltage of 100V, measure the surperficial intrinsic resistance value of sample with the meter 4329A (trade(brand)name) of the said firm.

(determinating reference)

AR (Ω) is 10 ¹²below (level that can be practical).

BR (Ω) is more than 10 ¹²(being difficult to practical level).

(8) from the mensuration of the oligopolymer amount (OL) of the release layer surface extraction of mold release film:

In advance by nonheat-treated mold release film in atmosphere, 180 DEG C heating 10 minutes.Then, this film after this thermal treatment is attached to the internal surface of the length and width 10cm of opened upper end, the case of high 3cm as far as possible, makes the shape of box-shaped.When being provided with coating layer, coating aspect is made to be inner side.Then, add after DMF (dimethyl formamide) 4ml places 3 minutes among the case be made up of aforesaid method, reclaim DMF.The DMF reclaimed is supplied liquid chromatography (Shimadzu Seisakusho Ltd.'s system: LC-7A), obtains the oligopolymer amount in DMF, by the membrane area of this value divided by contact DMF, obtain film surface oligomers amount (mg/m ²).

Oligopolymer amount in DMF is tried to achieve (absolute standard curve method) by standard test specimen peak area and the peak area ratio measuring sample peak area.The making of standard test specimen divides the oligopolymer got (cyclic trimer) in advance by precise, is dissolved in the DMF of precise and makes.The concentration of standard test specimen is preferably the scope of 0.001 ~ 0.01mg/ml.

Wherein, the condition of liquid chromatography is as follows.

Mobile phase A: acetonitrile

Mobile phase B: 2% acetic acid aqueous solution

Post: Mitsubishi Chemical's (strain) system " MCI GEL ODS 1HU "

Column temperature: 40 DEG C

Flow velocity: 1ml/ minute

Determined wavelength: 254nm

(9) from the metallic element flow measurement of the stripping surface side of mold release film:

Fluorescent X-ray determinator ((strain) Shimadzu Seisakusho Ltd. (system) pattern " XRF-1500 ") is used to utilize FP (fundamental parameters method by the face being provided with release layer of specimen sample in advance, Fundamental Parameter Method) method, under the condition determination shown in following table 1, measure metallic element amount.

[table 1]

(condition determination)

Setting item	Zr	Al	Ti
				X-ray tube target	Rh4.0kW	Rh4.0kW	Rh4.0kW
Light splitting crystallization	LiF	PET	LiF
				2θ	22.550	144.58	86.14
Detector	SC	FPC	FPC
				Tube current	95mA	95mA	95mA
Tube voltage	40kv	40kv	40kv

(10) the film adaptation of mold release film promotes to evaluate (practical characteristic substitute is evaluated):

By sample film in constant temperature and humidity cabinet, 60 DEG C, place 4 weeks under 80%RH atmosphere after, take out sample film.Then, utilize the stripping surface 5 times of tentacle friction sample film, judge according to the degree of coming off of following determinating reference to release layer.

(determinating reference)

A does not observe come off (the level that can be practical) of film.

B film bleaches but do not come off (level that can be practical).

C confirms coming off (being difficult to practical level) of film.

(11) the store elastic modulus (G`) of bond layer measures:

The double-sided adhesive sheet obtained from embodiment and comparative example peels off separator, only lamination acrylic acid series bond layer, makes the multilayer body of the acrylic acid series bond layer of thickness (after dry) 1.5mm ± 0.1mm, as working sample.To said determination sample, use " Advanced Rheometric Expansion System (ARES) " of RheometricScientific Inc., under the condition of frequency 1Hz, measure with the scope of-70 ~ 200 DEG C, heat-up rate 5 DEG C/min, obtain the store elastic modulus (G`) during temperature 23 DEG C.In addition, the store elastic modulus (G`) of the bond layer that the embodiment in the present invention and comparative example use is 5.0 × 10 ⁴pa.

(12) discontinuous separability evaluation (practical characteristic substitute is evaluated):

Following adhesive composite is coated the second mold release film, after carrying out thermal treatment in 5 minutes at 100 DEG C, obtains the adhesive linkage that thickness (after dry) is 50 μm.Then, the first mold release film is fitted in bond layer surface obtains without in base material double-sided adhesive sheet, when stripping the first mold release film, observation stripping situation, for the situation occurred of discontinuous stripping, judges according to following determinating reference.

< acrylic acid series adhesive composite >

(monomer coordinates composition)

2-EHA 70 % by weight

Vinylformic acid 2-methoxy acrylate 29 % by weight

Vinylformic acid 4-hydroxybutyl 1 % by weight

Form 100 weight parts relative to above-mentioned monomer, add Japanese polyurethane CORONATEL0.1 part, obtain acrylic acid series bond layer formation composition.

(determinating reference)

A: very successfully peel off, does not peel off vestige, does not also peel off sound and produces.

B: stripping vestige slight as seen, produces very little stripping sound or slight discontinuous stripping (level that practicality throws into question sometimes) occurs.

C: peel off vestige as seen, is peeling sound.There is discontinuous stripping (level that practicality throws into question).

(13) the separability evaluation (practical characteristic substitute is evaluated) of first, second mold release film:

In (7) item, for stripping the first mold release film time, the second release layer and bond layer interface situation, carry out sense evaluation according to following determinating reference.

(determinating reference)

A: at the second release layer and bond layer interface, does not see abnormal (level no problem in practicality).

B: at the second release layer and bond layer interface, sees and slightly floating (level that practicality throws into question sometimes).

C: at the second release layer and bond layer interface, sees and significantly floating (in practicality problematic level).

(14) easiness evaluation (practical characteristic substitute is evaluated) is checked:

What use embodiment and comparative example to obtain is each without base material double-sided adhesive sheet, after peeling off the first mold release film, is fitted on the bond layer exposed surface, obtain the multilayer body of the formation with Polarizer/bond layer/the second mold release film with Polarizer.

Then use the multilayer body obtained, utilize Nicol crossed method to carry out the inspection of Polarizer.

The each inspection easiness without base material double-sided adhesive sheet obtained in embodiment is good, but what obtain in comparative example is each without among base material double-sided adhesive sheet, the variation of orientation angle is not obvious more than adhesive sheet light and shade when Nicol crossed is observed of 6 degree/500mm, for being difficult to the situation checked.

(determinating reference)

The variation of A orientation angle is 6 degree/below 500mm.

The variation of B orientation angle is more than 6 degree/500mm.

(15) oligopolymer stopping property is evaluated (practical characteristic substitute is evaluated):

The oligopolymer amount utilizing (8) item to obtain, judges according to following determinating reference.

(determinating reference)

A oligopolymer amount is 0.5mg/m ²below.

B oligopolymer amount is more than 0.5mg/m ².

(16) identity evaluation (practical characteristic substitute is evaluated)

Visual observations is without base material double-sided adhesive sheet, and which side is the mold release film for the light side of peeling force fit to, and judges according to following determinating reference.

(determinating reference)

A can identify.

B is difficult to identify.

(17) static electricity resistance evaluation (practical characteristic substitute is evaluated)

23 DEG C, under the mensuration atmosphere of 50%RH, without after the abundant damping of base material double-sided adhesive sheet, the first mold release film will be peeled off.Then, on surperficial for the bond layer the exposed ash at leisure close to the tobacco of pulverizing in advance, judge according to the attachment of following determinating reference to ash now.

(determinating reference)

A: even if film contact ash does not also adhere to.

B: only make film will adhere in large quantities close to ash.

(18) comprehensive evaluation (practical characteristic substitute is evaluated):

Use manufacture in embodiment and comparative example without base material double-sided adhesive sheet, for each assessment item of discontinuous stripping situation occurred, separability, static electricity resistance, oligopolymer stopping property, adaptation, inspection easiness, carry out comprehensive evaluation according to following determinating reference.

(determinating reference)

A: discontinuous stripping situation occurred, separability, static electricity resistance, oligopolymer stopping property, adaptation, inspection easiness are " A " (level no problem in practicality).

B: among discontinuous stripping situation occurred, separability, static electricity resistance, oligopolymer stopping property, adaptation, inspection easiness, at least one is " B " (in practicality, the level thrown into question sometimes).

C: at least one in discontinuous stripping situation occurred, separability, static electricity resistance, oligopolymer stopping property, adaptation, inspection easiness is " C " (in practicality problematic level).

< first invention >

The polyester used in embodiment and comparative example is the polyester carrying out as follows preparing to obtain.

The manufacture > of < polyester

Production Example 1 (polyethylene terephthalate A1)

Dimethyl terephthalate (DMT) 100 parts, ethylene glycol 60 parts and 0.09 part, four acetate hydrate magnesium are taken in reactor, heat tracing heats up, and by methyl alcohol distillation removing, carries out transesterification reaction, from reaction, need within 4 hours, be warmed up to 230 DEG C, in fact transesterification reaction is terminated.Then, after adding ethylene glycol slurry acid phosphate ester 0.04 part, ANTIMONY TRIOXIDE SB 203 99.8 PCT 0.03 part, with within 100 minutes, to make, temperature reaches 280 DEG C, pressure reaches 15mmHg, also slowly reduces pressure later, finally reaches 0.3mmHg.After 4 hours, return normal pressure by system, obtain the polyethylene terephthalate A1 of intrinsic viscosity 0.61.

Production Example 2 (polyethylene terephthalate A2)

In Production Example 1, add the silica dioxide granule 0.6 part of median size 2.5 μm, to manufacture equally with Production Example 1 in addition, obtain the polyethylene terephthalate A2 of intrinsic viscosity 0.62.

Production Example 3 (polyester film F1a)

Raw material polyethylene terephthalate A1, A2 obtained using the ratio blending of 80%, 20% is respectively as top layer raw material, using the raw material of the raw material of polyethylene terephthalate A1=100% as middle layer, supply 2 forcing machines with ventilation opening, supply the forcing machine with ventilation opening, after melt extruding at 290 DEG C, use electrostatic to apply closely sealed method cooling curing on cooling roller surface temperature being set in 40 DEG C, obtain the amorphous membrance of thickness about 1300 μm.

This film is stretched 3.5 times in the vertical at 90 DEG C, stretch 4.1 times in the horizontal at 130 DEG C, heat-treat at 230 DEG C, then, carry out the relaxation processes of 4.3% in the direction of the width, obtain the polyester film F1a of thickness 50 μm (thickness constituent ratio=2.5 μm/45 μm/2.5 μm).

Production Example 4 (polyester film F2a)

Raw material polyethylene terephthalate A1, A2 obtained using the ratio blending of 80%, 20% is respectively as top layer raw material, using the raw material of the raw material of polyethylene terephthalate A1=100% as middle layer, supply 2 forcing machines with ventilation opening, after melt extruding at 290 DEG C, use electrostatic to apply closely sealed method cooling curing on cooling roller surface temperature being set as 40 DEG C, obtain the amorphous membrance of thickness about 740 μm.

This film is stretched 3.5 times in the vertical at 90 DEG C, at 130 DEG C cross directional stretch 4.1 times, heat-treat at 230 DEG C, then, carry out the relaxation processes of 4.3% in the direction of the width, obtain the polyester film of thickness 50 μm (thickness constituent ratio=2.5 μm/45 μm/2.5 μm).Then utilize reverse plate gravure coating method to be coated with off-line and form by following coating agent the coating layer formed, make glue spread (after dry) be 0.05g/m ², then, carry out thermal treatment in 30 seconds at 120 DEG C, obtain the polyester film F2a of the thickness 50 μm being provided with coating layer.

(coating layer composition)

AC1:Colcoat N-103X (Colcoat Inc.)

AC2: aluminium tris(acetylacetonate)

AC3: four methyl ethyl diketone zirconiums

AC4: four titanium acetylacetones

(matching requirements)

Production Example 5 (polyester film F3a)

Except the cooperation difference of coating layer in Production Example 4, to manufacture equally with Production Example 4, obtain polyester film F3a.

Production Example 6 (polyester film F4a)

Except the cooperation difference of coating layer in Production Example 4, to manufacture equally with Production Example 4, obtain polyester film F4a.

Production Example 7 (polyester film F5a)

Except the cooperation difference of coating layer in Production Example 4, to manufacture equally with Production Example 4, obtain polyester film F5a.

Production Example 8 (polyester film F6a)

Raw material polyethylene terephthalate A1, A2 obtained using the ratio blending of 80%, 20% is respectively as top layer raw material, using the raw material of the raw material of polyethylene terephthalate A1=100% as middle layer, supply 2 forcing machines with ventilation opening, after melt extruding at 290 DEG C, use electrostatic to apply closely sealed method cooling curing on cooling roller surface temperature being set as 40 DEG C, obtain the amorphous membrance of thickness about 740 μm.

This film is stretched 2.8 times in the vertical at 90 DEG C, stretch 5.4 times in the horizontal at 120 DEG C, heat-treat at 200 DEG C, then, carry out the relaxation processes of 4.3% in the direction of the width, obtain the polyester film of thickness 50 μm (thickness constituent ratio=2.5 μm/45 μm/2.5 μm).Then utilize reverse plate gravure coating method to be coated with off-line and form by following coating agent the coating layer formed, make glue spread (after dry) be 0.05g/m ², then, carry out thermal treatment in 30 seconds at 120 DEG C, obtain the polyester film F6a of the thickness 50 μm being provided with coating layer.

(coating layer composition)

AC1:Colcoat N-103X (Colcoat Inc.)

AC2: aluminium tris(acetylacetonate)

AC3: four methyl ethyl diketone zirconiums

AC4: four titanium acetylacetones

(matching requirements)

Production Example 9 (polyester film F7a)

Except not arranging except coating layer in Production Example 4, to manufacture equally with Production Example 4, obtaining polyester film F7a.

(release layer composition-A)

Curing type silicone resin

(LTC303E:Dow Corning Toray Co., Ltd. system) 100 parts

1 part, solidifying agent (SRX212:Dow Corning Toray Co., Ltd. system)

MEK/ toluene Mixed Solvent (mixture ratio is 1:1) 1500 parts

(release layer composition-B)

Curing type silicone resin (KS-847H: SHIN-ETSU HANTOTAI's chemistry system) 100 parts

1 part, solidifying agent (PL-50T: SHIN-ETSU HANTOTAI's chemistry system)

MEK/ toluene Mixed Solvent (mixture ratio is 1:1) 1500 parts

(release layer composition-C)

(release layer composition-D)

Embodiment 1:

The manufacture > of < first mold release film

Utilize reverse plate gravure coating method to be coated with following release layer composition-A at polyester film F1a with off-line, make glue spread (after dry) be 0.1g/m ², then, carry out thermal treatment in 30 seconds at 120 DEG C.

(release layer composition-A)

Curing type silicone resin

(LTC303E:Dow Corning Toray Co., Ltd. system) 100 parts

1 part, solidifying agent (SRX212:Dow Corning Toray Co., Ltd. system)

MEK/ toluene Mixed Solvent (mixture ratio is 1:1) 1500 parts

Be shown in table 2 ~ 4 by the property list of the first mold release film obtained above.In addition, the embodiment numbering in table 4 refers to embodiment numbering (following identical) in table 5 described later.

The manufacture > of < second mold release film

In polyester film F2a, coating layer utilizes reverse plate gravure coating method to be coated with following release layer composition-D with off-line and makes glue spread for 0.1g/m ²(after dry), then, carries out thermal treatment in 30 seconds at 120 DEG C.The property list of the second mold release film obtained is shown in table 1 ~ 4.

(release layer composition-C)

< is without the manufacture > of base material double-sided adhesive sheet

The release layer of the second obtained mold release film applies with coating machine (applicator) coating fluid be made up of following acrylic acid series adhesive composite, then use hot air type recirculation still to carry out thermal treatment in 5 minutes at 100 DEG C, obtaining glue spread (after dry) is 50g/m ²bond layer.

< acrylic acid series bond layer is formed and uses composition >

(monomer coordinates composition)

2-EHA 70 % by weight

Vinylformic acid 2-methoxy acrylate 29 % by weight

Vinylformic acid 4-hydroxybutyl 1 % by weight

Form 100 weight parts relative to above-mentioned monomer, add Japanese polyurethane CORONATEL0.1 part, obtain acrylic acid series bond layer formation composition.

Then use the rubber rollers of 2kg, the release layer of the first mold release film and bond layer are fitted, obtains without base material double-sided adhesive sheet.The obtained property list without base material double-sided adhesive sheet is shown in table 5.

Embodiment 2 ~ embodiment 6 and comparative example 1 ~ comparative example 3:

In embodiment 1, coating agent is formed, releasing agent forms, polyester film base material thickness changes as shown in following table 2 and table 3, in addition, manufacture similarly to Example 1, obtain the first mold release film shown in table 4 and the second mold release film.Then, both uses are fitted across bond layer, obtain without base material double-sided adhesive sheet.By each mold release film obtained in above-described embodiment and comparative example be shown in table 2 ~ table 5 without the property list of base material double-sided adhesive sheet.

[table 2]

Project	Unit	F1a	F2a	F3a	F4a	F5a	F6a	F7a
									Film thickness	μm	38	50	50	50	50	50	50
Longitudinal stretching multiplying power	-	3.5	3.5	3.5	3.5	3.5	2.8	3.5
									Longitudinal drawing temperature	℃	90	90	90	90	90	90	90
Cross directional stretch multiplying power	-	4.1	4.1	4.1	4.1	4.1	5.4	4.1
									Transverse drawing temperature	℃	130	130	130	130	130	120	130
Heat fixation temperature	℃	230	230	230	230	230	200	230
									Relaxation rate	％	4.3	4.3	4.3	4.3	4.3	4.3	4.3
The variation of orientation angle	Degree/500mm	7	7	7	7	7	3	7
									Postpone	nm	1340	1620	1620	1620	1620	1860	1620

[table 3]

[table 5]

< second invention >

The polyester used in embodiment and comparative example is the polyester carrying out as follows preparing to obtain.

The manufacture > of < polyester

Production Example 10 (polyethylene terephthalate A1)

Dimethyl terephthalate (DMT) 100 parts, ethylene glycol 60 parts and 0.09 part, four acetate hydrate magnesium are taken in reactor, heat tracing heats up, and by methyl alcohol distillation removing, carries out transesterification reaction, from reaction, need within 4 hours, be warming up to 230 DEG C, make in fact transesterification reaction terminate.Then, after adding ethylene glycol slurry acid phosphate ester 0.04 part, ANTIMONY TRIOXIDE SB 203 99.8 PCT 0.03 part, made temperature reach 280 DEG C with 100 minutes, make pressure reach 15mmHg, also slowly reduce pressure later, finally reach 0.3mmHg.After 4 hours, return normal pressure by system, obtain the polyethylene terephthalate A1 of intrinsic viscosity 0.61.

Production Example 11 (polyethylene terephthalate A2)

In Production Example 10, add the silica dioxide granule 0.6 part of median size 2.5 μm, in addition, to manufacture equally with Production Example 1, obtain the polyethylene terephthalate A2 of intrinsic viscosity 0.62.

Production Example 12 (polyethylene terephthalate A3)

In Production Example 1, add the synthetic calcium carbonate particle 1.0 parts of median size 0.8 μm, in addition, to manufacture equally with Production Example 10, obtain the polyethylene terephthalate A3 of intrinsic viscosity 0.62.

Production Example 13 (polyester film F1b)

Raw material polyethylene terephthalate A1, A3 obtained using the ratio blending of 92%, 8% is respectively as top layer raw material, raw material polyethylene terephthalate A1, A3 obtained using the ratio blending of 80%, 20% is respectively as the raw material in middle layer, supply 2 forcing machines with ventilation opening, supply the forcing machine with ventilation opening, after melt extruding at 290 DEG C, use electrostatic to apply closely sealed method cooling curing on cooling roller surface temperature being set as 40 DEG C, obtain the amorphous membrance of thickness about 1300 μm.

This film is stretched 3.5 times in the vertical at 90 DEG C, stretch 4.1 times in the horizontal at 130 DEG C, heat-treat at 230 DEG C, then carry out the relaxation processes of 4.3% in the direction of the width, obtain the polyester film F1b of thickness 50 μm (thickness constituent ratio=2.5 μm/45 μm/2.5 μm).

Production Example 14 (polyester film F2b)

Raw material polyethylene terephthalate A1, A3 obtained using the ratio blending of 92%, 8% is respectively as top layer raw material, raw material polyethylene terephthalate A1, A3 obtained using the ratio blending of 80%, 20% is respectively as the raw material in middle layer, supply 2 forcing machines with ventilation opening, after melt extruding at 290 DEG C, use electrostatic to apply closely sealed method cooling curing on cooling roller surface temperature being set as 40 DEG C, obtain the amorphous membrance of thickness about 740 μm.

This film is stretched 3.5 times in the vertical at 90 DEG C, stretch 4.1 times in the horizontal at 130 DEG C, heat-treat at 230 DEG C, then, carry out the relaxation processes of 4.3% in the direction of the width, obtain the polyester film of thickness 50 μm (thickness constituent ratio=2.5 μm/45 μm/2.5 μm).Then, utilize reverse plate gravure coating method to be coated with off-line and form by following coating agent the coating layer formed, make glue spread (after dry) be 0.05g/m ², then carry out thermal treatment in 30 seconds at 120 DEG C, obtain the polyester film F2b of the thickness 50 μm being provided with coating layer.

(coating layer composition)

AC1:Colcoat N-103X (Colcoat Inc.)

AC2: aluminium tris(acetylacetonate)

AC3: four methyl ethyl diketone zirconiums

AC4: four titanium acetylacetones

(matching requirements)

Production Example 15 (polyester film F3b)

Except the cooperation difference of coating layer in Production Example 14, to manufacture equally with Production Example 14, obtain polyester film F3b.

Production Example 16 (polyester film F4b)

Except the cooperation difference of coating layer in Production Example 14, to manufacture equally with Production Example 14, obtain polyester film F4b.

Production Example 17 (polyester film F5b)

Except the cooperation difference of coating layer in Production Example 14, to manufacture equally with Production Example 14, obtain polyester film F5b.

Production Example 18 (polyester film F6b)

Raw material polyethylene terephthalate A1, A3 obtained using the ratio blending of 92%, 8% is respectively as top layer raw material, raw material polyethylene terephthalate A1, A3 obtained using the ratio blending of 80%, 20% is respectively as the raw material in middle layer, supply 2 forcing machines with ventilation opening, after melt extruding at 290 DEG C, use electrostatic to apply closely sealed method cooling curing on cooling roller surface temperature being set as 40 DEG C, obtain the amorphous membrance of thickness about 740 μm.This film is stretched 2.8 times in the vertical at 90 DEG C, stretch 5.4 times in the horizontal at 120 DEG C, heat-treat at 200 DEG C, then, carry out the relaxation processes of 4.3% in the direction of the width, obtain the polyester film of thickness 50 μm (thickness constituent ratio=2.5 μm/45 μm/2.5 μm).Then, utilize reverse plate gravure coating method to be coated with off-line and form by following coating agent the coating layer formed, make glue spread (after dry) be 0.05g/m ²after, carry out thermal treatment in 30 seconds at 120 DEG C, obtain the polyester film F6b of the thickness 50 μm being provided with coating layer.

(coating layer composition)

AC1:Colcoat N-103X (Colcoat Inc.)

AC2: aluminium tris(acetylacetonate)

AC3: four methyl ethyl diketone zirconiums

AC4: four titanium acetylacetones

(matching requirements)

Production Example 19 (polyester film F7b)

Except not arranging except coating layer in Production Example 14, to manufacture equally with Production Example 14, obtaining polyester film F7b.

Production Example 20 (polyester film F8b)

In Production Example 14, the raw material in top layer, middle layer coordinates and changes as described as follows, and does not arrange coating layer, in addition, to manufacture equally with Production Example 14, obtains polyester film F8b.

Top layer raw material: use by polyethylene terephthalate A1, A2 respectively with 80%, 20% the raw material that obtains of ratio blending.

Middle layer raw material: the raw material using polyethylene terephthalate A1=100%.

(release layer composition-A)

Curing type silicone resin

(LTC303E:Dow Corning Toray Co., Ltd. system) 100 parts

1 part, solidifying agent (SRX212:Dow Corning Toray Co., Ltd. system)

MEK/ toluene Mixed Solvent (mixture ratio is 1:1) 1500 parts

(release layer composition-B)

Curing type silicone resin (KS-847H: SHIN-ETSU HANTOTAI's chemistry system) 100 parts

1 part, solidifying agent (PL-50T: SHIN-ETSU HANTOTAI's chemistry system)

MEK/ toluene Mixed Solvent (mixture ratio is 1:1) 1500 parts

(release layer composition-C)

(release layer composition-D)

Embodiment 7:

The manufacture > of < first mold release film

Utilize reverse plate gravure coating method to be coated with following release layer composition-A at polyester film F1b with off-line, make glue spread (after dry) be 0.1g/m ²after, carry out thermal treatment in 30 seconds at 120 DEG C.

(release layer composition-A)

Curing type silicone resin

(LTC303E:Dow Corning Toray Co., Ltd. system) 100 parts

1 part, solidifying agent (SRX212:Dow Corning Toray Co., Ltd. system)

MEK/ toluene Mixed Solvent (mixture ratio is 1:1) 1500 parts

Property list by the first mold release film obtained above is shown in table 6 ~ 8.In addition, the embodiment numbering in table 8 refers to embodiment numbering (following identical) in table 9 described later.

The manufacture > of < second mold release film

In polyester film F2b, coating layer utilizes reverse plate gravure coating method to be coated with following release layer composition-D with off-line, makes glue spread be 0.1g/m ²after (after dry), carry out thermal treatment in 30 seconds at 120 DEG C.The property list of the second obtained mold release film is shown in table 6 ~ 8.

(release layer composition-C)

< is without the manufacture > of base material double-sided adhesive sheet

On the release layer of the second obtained mold release film, after utilizing coating machine to apply the coating fluid be made up of following acrylic acid series adhesive composite, use hot air type recirculation still, carry out thermal treatment in 5 minutes at 100 DEG C, obtain the bond layer that glue spread (after dry) is 50 μm.

< acrylic acid series bond layer is formed and uses composition >

(monomer coordinates composition)

2-EHA 70 % by weight

Vinylformic acid 2-methoxy acrylate 29 % by weight

Vinylformic acid 4-hydroxybutyl 1 % by weight

Form 100 weight parts relative to above-mentioned monomer, add Japanese polyurethane CORONATEL0.1 part, obtain acrylic acid series bond layer formation composition.

Then use the rubber rollers of 2kg, the release layer of the first mold release film and bond layer are fitted, obtains without base material double-sided adhesive sheet.

Embodiment 8 ~ embodiment 12 and comparative example 4 ~ comparative example 7:

In embodiment 7, coating agent is formed, releasing agent forms, polyester film base material thickness changes as shown in following table 6 and table 7, in addition, manufacture similarly to Example 7, obtain the first mold release film shown in table 8 and the second mold release film.Then, both uses are fitted across bond layer, obtain without base material double-sided adhesive sheet.By each mold release film obtained in above-described embodiment and comparative example be shown in table 6 ~ table 9 without the property list of base material double-sided adhesive sheet.

[table 6]

Project	Unit	F1b	F2b	F3b	F4b	F5b	F6b	F7b	F8b
										Film thickness	μm	38	50	50	50	50	50	50	38
Longitudinal stretching multiplying power	-	3.5	3.5	3.5	3.5	3.5	2.8	3.5	3.5
										Longitudinal drawing temperature	℃	90	90	90	90	90	90	90	90
Cross directional stretch multiplying power	-	4.1	4.1	4.1	4.1	4.1	5.4	4.1	4.1
										Transverse drawing temperature	℃	130	130	130	130	130	120	130	130
Heat fixation temperature	℃	230	230	230	230	230	200	230	230
										Relaxation rate	％	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3
The variation of orientation angle	Degree/500mm	7	7	7	7	7	3	7	7
										Postpone	nm	1340	1620	1620	1620	1620	1860	1620	1340

[table 7]

[table 9]

Industrial utilizability

Static electricity resistance without base material double-sided adhesive sheet of the present invention, release property, oligopolymer stopping property, inspection easiness well, are suitable as the various optics parts such as such as liquid crystal polarization plate manufacture is used, the touch panel member for producing of capacitance-type.

Nomenclature

10: without base material double-sided adhesive sheet

11: bond layer

13: the first mold release film base materials

14: the first coating layers

15: the first releasing agent layers

23: the second mold release film base materials

24: the second coating layers

25: the second releasing agent layers

31: the first mold release film (light stripping film)

32: the second mold release film (heavy stripping film)

Claims (5)

1., without a base material double-sided adhesive sheet, it is characterized in that:

It is lamination mold release film respectively on the two sides of bond layer, and the peeling force of a mold release film (the first mold release film) is less than the peeling force of another mold release film (the second mold release film),

Second mold release film meets the condition of following (a) ~ (c) recorded simultaneously:

A () its surface for the coating layer containing water-disintegrable silicon compound set on biaxially oriented polyester film is provided with the mold release film of release layer;

B the variation of the orientation angle in () described biaxially oriented polyester film face is 6 degree/below 500mm;

C oligopolymer amount that () is extracted from the release layer surface of described mold release film by dimethyl formamide is 0.5mg/m ²below.

2. as claimed in claim 1 without base material double-sided adhesive sheet, it is characterized in that:

The film mist degree of the first mold release film is more than 6%.

3. as claimed in claim 1 or 2 without base material double-sided adhesive sheet, it is characterized in that:

Water-disintegrable silicon compound is the compound shown in following general formula,

Si(OR ¹) _x(R ²) _4－x

Wherein, x represents the integer of 2 ~ 4, R ¹represent alkyl or acyl group, R ²represent the organic group of carbonatoms 1 ~ 10.

4. according to any one of claims 1 to 3 without base material double-sided adhesive sheet, it is characterized in that: the coating layer of the second mold release film contains containing metal organic clement compound.

5. as claimed in claim 4 without base material double-sided adhesive sheet, it is characterized in that:

Compounding ratio (weight ratio) (A) of water-disintegrable silicon compound (A) and containing metal organic clement compound (B): the scope that (B) is 1:0.001 ~ 1:0.01.