CN104231966A - Manufacturing method for double-surface bonding sheet - Google Patents

Abstract

The invention relates to a manufacturing method for a double-surface bonding sheet. The invention provides the manufacturing method for the double-surface bonding sheet, which has advantages of excellent surface smoothness and excellent re-peeling performance. The manufacturing method for the double-surface bonding sheet comprises the steps of forming a first adhesive layer on the first surface of a sheet-shaped porous substrate, and forming a second adhesive layer on the second surface of the porous substrate. The manufacturing method comprises the steps of: an applying step of applying an adhesive composition on a peelable supporting member; a contacting step of making the adhesive composition contact with the porous substrate after the applying step; and a step of forming a first adhesive layer through drying the adhesive composition after contacting with the porous substrate. The arithmetic average surface roughness of one surface of the peelable supporting member is less than 1 mu m, wherein the adhesive composition is applied on the surface of the peelable supporting member.

Description

The manufacture method of double-sided adhesive sheet

Technical field

The present invention relates to the manufacture method of double-sided adhesive sheet.

Background technology

From the viewpoint of saving resource, for the parts used in the various goods such as family's electrical article, automobile, business automation equipment, the goods after using are disassembled and the situation of these parts or its constituent material recycling (recovery) increased gradually.In the process that recycle object parts or its constituent material that two-sided adhesive type adhesive sheet (double-sided adhesive sheet) will be used with other components bonding recycle, usually require double-sided adhesive sheet to peel off (peeling off again) from recycle object parts.During this stripping, if a part for double-sided adhesive sheet remains in the surface of recycle object parts, then owing to removing the operation of described residue from recycle object parts, the efficiency of recovery process is significantly declined.As producing the situation of above-mentioned residue, can be set forth in that double-sided adhesive sheet in stripping process is broken, destruction (interlaminar failure) that the form that double-sided adhesive sheet is torn at the inside through-thickness of porous substrate occurs, the situation such as a part (generation of adhesive deposit) at the remained on surface tackiness agent (also referred to as pressure-sensitive adhesive) of recycle object parts.As the technical literature relevant to improving described situation (raising releasable), patent documentation 1 ~ 4 can be enumerated.

Prior art document

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2006-143856 publication

Patent documentation 2: Japanese Unexamined Patent Publication 2001-152111 publication

Patent documentation 3: Japanese Unexamined Patent Publication 2000-265140 publication

Patent documentation 4: Japanese Unexamined Patent Publication 2007-270034 publication

Summary of the invention

Invent problem to be solved

By the way, as the means forming binder layer, known direct method and transfer printing.In order to improve releasable, preferably adopting such as: disclosed in patent documentation 1,2, using the coating means such as coating machine to be coated directly onto by binder composition on porous substrate and dry thus form the direct method of binder layer.According to direct method, binder layer is infiltrated up in porous substrate fully, therefore can improve the intensity of double-sided adhesive sheet entirety, suppresses interlaminar failure.But, be difficult to obtain to resemble the surface smoothness the binder layer that obtained by following transfer printing by direct method.When can not get good smoothness, there is the tendency being difficult to improve the adhesion characteristic such as bounding force, confining force.

On the other hand, transfer printing briefly refers to the surface (release surface) that binder composition is applied to supporter (such as release liner) and dry thus form binder layer on a surface, and this binder layer is fitted to the method for transfer printing binder layer on base material.According to transfer printing, by making the surface smoothing of supporter can obtain excellent surface smoothness, but binder layer is difficult to be infiltrated up in porous substrate, can not expect resemble by direct method realize releasable.In addition, Patent Document 4 discloses by carrying out drying in the front and back of above-mentioned transfer printing and form the method for binder layer, but the binder layer using water vapour permeability interleaving paper, formation has smooth-flat-surface is not enlightened.

For the means of dealing with problems

The present invention makes in view of above-mentioned existing situation, its object is to provide the surface smoothness of binder layer excellent and the manufacture method of the double-sided adhesive sheet that releasable is excellent.

According to the present invention, provide a kind of manufacture method of double-sided adhesive sheet, its first surface being included in the porous substrate of sheet forms the first binder layer, and forms the second binder layer at second of this porous substrate.The method comprises following operation: binder composition is applied to the applying step on peelable supporter; After described applying step, make the contact operation that described binder composition contacts with described porous substrate; By the binder composition after contacting with described porous substrate is dry and form the operation of described first binder layer.The arithmetic mean surface roughness in the face of the described binder composition of applying of described peelable supporter is less than 1 μm.

According to described method, by making applying (being coated with typically) contact to the binder composition on peelable supporter with porous substrate, binder composition is immersed in porous substrate fully.At this, binder composition refers to the tackiness agent of the state before being in drying terminates.Therefore, in this manual, binder composition (such as adhesive composition layer) and tackiness agent (typically binder layer) can as be in drying terminate before and after the material of different states distinguished.Such binder composition, typically in aqueous (comprising pasty state), is preferably the binder composition of non-drying regime.Therefore, the double-sided adhesive sheet obtained by aforesaid method can become following double-sided adhesive sheet: binder layer is integrated with high level with porous substrate, after using, when being peeled off by double-sided adhesive sheet from adherend, this double-sided adhesive sheet is not easy to remain on adherend.Therefore, manufacturing method according to the invention, provides the double-sided adhesive sheet that releasable is excellent.In addition, the adhesive face of the first binder layer is formed in be had on the peelable supporter of smooth-flat-surface, therefore can realize the surface smoothness more excellent than the binder layer formed by direct method.

In an optimal way of manufacture method disclosed herein, described double-sided adhesive sheet is formed in the mode meeting following characteristic: (A) pastes a slice aluminium sheet respectively on the surface of the surface of described first binder layer and described second binder layer, keep 24 hours under the environment of temperature 65 DEG C, relative humidity (RH) 80%, then keep 2 hours under the environment of temperature 23 DEG C, relative humidity 50%, when then carrying out T-shaped stripping test with the speed of 100mm/ second, in the area of this double-sided adhesive sheet, more than 50% peels off in the interface of binder layer and aluminium sheet.The double-sided adhesive sheet meeting above-mentioned characteristic (A) can realize more excellent releasable.

In an optimal way of manufacture method disclosed herein, in described contact operation, described porous substrate contacts from top with described binder composition.Thus, can utilize the deadweight of porous substrate that binder composition is infiltrated up in porous substrate more fully.In addition, carry out at the temperature of the drying of described binder composition preferably below 100 DEG C.

In an optimal way of technology disclosed herein, described binder composition contains organic solvent as solvent.The solvent-borne type adhesive sheet with the binder layer with an organic solvent formed generally has the adhesion characteristics such as the bounding force tendency more excellent than aqueous dispersion type adhesive sheet.Consider that strong adhesive power can, for contrary characteristic, when solvent-borne type double-sided adhesive sheet disclosed herein is designed to strong fusible adhesive sheet, be estimated more to be difficult to realize releasable than aqueous dispersion type with releasable.But, even if when adopting such design, according to manufacture method disclosed herein, also excellent releasable can be realized.Therefore, method disclosed herein can be preferably applied to the manufacture of solvent-borne type double-sided adhesive sheet.

In an optimal way of technology disclosed herein, in described contact operation, the solid component concentration (NV) of described binder composition is 30 ~ 50 quality %.In addition, in described contact operation, the viscosity of described binder composition preferably at 23 DEG C is 1 ~ 50Pas.Have above-mentioned NV or the binder composition of viscosity by using, the surface smoothness, productivity etc. of the infiltration in porous substrate, dried binder layer improve further.Wherein, above-mentioned NV is had concurrently and viscosity can play more excellent performance.

In an optimal way of technology disclosed herein, described binder composition is acrylic pressure-sensitive adhesive compositions.Forming the first binder layer by using containing the acrylic pressure-sensitive adhesive compositions of polymkeric substance based on acrylic polymers, effect of the present invention can be realized better.

In an optimal way of technology disclosed herein, use basic weight 10 ~ 30g/m ²non-woven fabrics as described porous substrate.In addition, preferably use the non-woven fabrics of thickness 10 ~ 150 μm as described porous substrate.By using the non-woven fabrics with above-mentioned basic weight or thickness as base material, the intensity raising that the intensity that balancedly can realize base material self is improved and realized by infiltration tackiness agent, can manufacture the double-sided adhesive sheet that releasable is more excellent.Wherein, above-mentioned basic weight is had concurrently and thickness can play more excellent performance.

In an optimal way of technology disclosed herein, more than the 90 quality % of the formation fiber of described porous substrate are manila hemp fiber.The porous substrate of such composition can become the material being suitable as and balancedly realizing the base material that the intensity of base material self improves and the intensity passed through infiltration tackiness agent and realize improves.

In addition, according to the present invention, provide double-sided adhesive sheet.This double-sided adhesive sheet have sheet porous substrate, be arranged on the first binder layer of the first surface of this porous substrate and be arranged on second binder layer of second of this porous substrate.In addition, the arithmetic mean surface roughness on the surface of described first binder layer is preferably less than 1 μm.In addition, described double-sided adhesive sheet preferably meets afore-mentioned characteristics (A).By forming by this way, first binder layer with excellent surface smoothness can be obtained, and realize excellent releasable.

In an optimal way of technology disclosed herein, described first binder layer be by after described porous substrate is contacted with the binder composition be applied on peelable supporter by binder layer that this binder composition drying obtains.The double-sided adhesive sheet with the first binder layer obtained by the method can have releasable and surface smoothness concurrently with high level.

In an optimal way of technology disclosed herein, the at least one that described double-sided adhesive sheet also meets in following characteristic is (preferably two or more, more preferably more than three kinds, preferably (B1) ~ (B4) is whole further): (B1) is more than 10N/20mm to 180 of stainless steel plate ° of peel adhesion for described first binder layer and described second binder layer; (B2) for described first binder layer and described second binder layer, more than 8N/20mm is to 180 ° of peel adhesion of polypropylene (PP) plate; (B3) for described first binder layer and described second binder layer, more than 9N/20mm is to 180 ° of peel adhesion of acrylonitrile-butadiene-styrene copolymer (ABS) plate; (B4) for described first binder layer and described second binder layer, more than 10N/20mm is to 180 ° of peel adhesion of blend polymer (PC-ABS) plate of polycarbonate and acrylonitrile-butadiene-styrene copolymer.Double-sided adhesive sheet disclosed herein, as mentioned above, can specify above bounding force to various adherend display.However, excellent releasable is shown when peeling off from adherend.In brief, glueability and releasable can be had more to heavens concurrently.

In an optimal way of technology disclosed herein, the at least one that described double-sided adhesive sheet also meets in following characteristic is (preferably two or more, more preferably more than three kinds, preferably (C1) ~ (C4) is whole further): (C1), in the constant load stripping test undertaken by following method, described first binder layer, the peel distance of described second binder layer to the stainless steel plate as adherend are below 10mm; (C2) in the constant load stripping test undertaken by following method, be below 10mm to the peel distance of the PP plate as adherend; (C3) in the constant load stripping test undertaken by following method, be below 10mm to the peel distance of the ABS plate as adherend; (C4) in the constant load stripping test undertaken by following method, be below 10mm to the peel distance of the PC-ABS plate as adherend.

[constant load stripping test]

Polyethylene terephthalate (PET) film adhesive face of the second binder layer of double-sided adhesive sheet being pasted thickness 25 μm carries out lining.Adhesive sheet after this lining is cut into width 20mm, length 100mm size thus make test film.Under the environment of temperature 23 DEG C, relative humidity 50%, by making the roller of 2kg once come and go, the adhesive face of the first binder layer of described test film is crimped onto the surface of adherend.Gained object is placed 24 hours under equivalent environment.Then, in the ventricumbent mode being pasted with described test film, adherend is flatly kept.The load applying 300g in one end of described test film makes peel angle be 90 degree, and measures the peel distance after 1 hour.

Accompanying drawing explanation

Fig. 1 is the sectional view of the representative configuration example schematically showing double-sided adhesive sheet.

Fig. 2 is the sectional view that another that schematically show double-sided adhesive sheet represents configuration example.

Fig. 3 is the explanatory view of the manufacture method of the double-sided adhesive sheet schematically showing an embodiment.

Fig. 4 is the explanatory view of the method for rupture test between presentation layer.

Fig. 5 is the explanatory view of the method for rupture test between presentation layer.

Fig. 6 is the explanatory view of the method for rupture test between presentation layer.

Fig. 7 is the explanatory view of the method for rupture test between presentation layer.

Fig. 8 is the explanatory view of the method representing constant load stripping test.

Reference numeral

1 double-sided adhesive sheet

10 porous substrates

10A first surface

10B second

21 binder layers (the first binder layer)

21A adhesive face (the first adhesive face)

212 upper sections

214 inferior portion

22 binder layers (the second binder layer)

22A adhesive face (the second adhesive face)

222 upper sections

224 inferior portion

25 binder compositions

31,32 release liners

Embodiment

Below the preferred embodiment of the present invention is described.In addition, the item implementing necessity of the present invention can be understood as the design item of the those skilled in the art based on the state of the art beyond the item mentioned especially in this specification sheets.The present invention can implement based on the technology general knowledge in content disclosed in this specification sheets and this area.

Double-sided adhesive sheet disclosed herein (can be banded isometric size modes) can have the cross section structure such as shown in Fig. 1 or Fig. 2.

Double-sided adhesive sheet 1 shown in Fig. 1 has the formation being respectively arranged with the first binder layer 21 and the second binder layer 22 on first surface 10A and second 10B of the porous substrate 10 of sheet.Upper section (Outboard Sections in this cross section) 212,222 in binder layer 21,22 covers first surface 10A and second 10B of porous substrate 10 respectively.On the other hand, the inferior portion (inboard portion in this cross section) 214,224 in binder layer 21,22 is infiltrated up to the inside of porous substrate 10 respectively.The surface (the first adhesive face 21A and the second adhesive face 22A) of binder layer 21,22 is protected by release liner 31,32 respectively.Release liner 31,32 be at least release surface (that is, the face can peeled off from adhesive face 21A, 22A) with binder layer 21,22 relative face (front) 31A, 32A.On the other hand, the back side (with the surface of 31A, 32A opposition side) 31B, 32B of release liner 31,32 can be release surface also can be non-peel-away face.

Double-sided adhesive sheet 1 shown in Fig. 2, except the front 31A of release liner 31 and back side 31B is release surface this point and does not have except release liner 32 this point, is formed in the same manner as the double-sided adhesive sheet 1 shown in Fig. 1.This double-sided adhesive sheet 1; by being reeled by this double-sided adhesive sheet 1, the surface of the second binder layer 22 (the second adhesive face 22A) is contacted with the back side 31B of release liner 31, what can become that the second adhesive face 22A also protects by release liner 31 is formed.

The base material forming the double-sided adhesive sheet in technology disclosed herein is the base material (i.e. porous substrate) of the vesicular structure with the degree that binder composition can infiltrate.In addition, can for allow when having the binder composition after contacting with porous substrate is dry the solvent composition that gasifies in this binder composition through the base material of ventilation property of degree.

As the typical case of porous substrate with above-mentioned character, non-woven fabrics can be enumerated.As non-woven fabrics, can use such as: the non-woven fabrics be made up of natural fibers such as wood pulp, cotton, fiber crops; The non-woven fabrics be made up of man-made fiber (synthon) such as trevira, artificial silk, vinylon, cellulose acetate fibre, polyvinyl alcohol (PVA) fiber, tynex, polyolein fiber, polyurethane fibers; Two or more fiber combinations different for material is used and the non-woven fabrics of formation; Deng.In addition, as the porous substrate beyond non-woven fabrics, the foaming body piece class be made up of foaies such as polyurathamc, foaming neoprene latexes can be illustrated; Various dry goods; Deng.

Above-mentioned porous substrate, from the viewpoint of the intensity of the infiltration of tackiness agent, this base material, preferably containing manila hemp fiber as formation fiber.The porous substrate of manila hemp fiber can be comprised in fact for forming fiber, also can for comprising the porous substrate of manila hemp fiber and other one or more fibers.As the preference of other fiber used together with manila hemp fiber, can enumerate such as: the cellulosic fibres such as the flaxen fiber beyond manila hemp fiber, lumber fibre (wood pulp etc.), artificial silk, cellulose acetate fibre.Other fiber above-mentioned can also be the fibers such as trevira, polyvinyl alcohol (PVA) fiber, tynex, polyolein fiber, polyurethane fiber.

Ratio in the formation fiber of above-mentioned porous substrate shared by manila hemp fiber is more than 30 quality % (typically being 30 ~ 100 quality %) is suitable, preferably more than 50 quality %, more preferably more than 70 quality %, preferably more than 80 quality %, particularly preferably more than 90 quality % further.Double-sided adhesive sheet disclosed herein can preferably be formed the mode that fiber in fact only comprises the porous substrate of cellulosic fibre (manila hemp fiber or manila hemp fiber and other cellulosic fibre) implemented to have.Wherein, the porous substrate that fiber in fact only comprises manila hemp fiber (typically, form 99 ~ 100 quality % of fiber, such as 100 quality % are manila hemp fiber) is preferably formed.

As the porous substrate in technology disclosed herein, basic weight can be preferably adopted to be about 30g/m ²(such as 25g/m below ²below, 20g/m typically is ²porous substrate below).The porous substrate of described basic weight, is applicable to forming light weight and the excellent double-sided adhesive sheet of bond properties.From the viewpoint of the infiltration of the exterior quality of double-sided adhesive sheet, the transparency, tackiness agent, preferred basis weights is less than 20g/m ²(such as 17g/m ²below, 15g/m typically is ²porous substrate below).Also be favourable in the drying property of the low binder composition in the formation of the first binder layer of above-mentioned basic weight.In addition, from the viewpoint of the intensity improving porous substrate self, above-mentioned basic weight is preferably 10g/m ²(such as 12g/m above ²above, 13g/m typically is ²above).

In technology disclosed herein, it is suitable that the thickness of above-mentioned porous substrate is generally less than about 150 μm.From the viewpoint of making tackiness agent be infiltrated up in base material entirety fully, above-mentioned thickness is preferably less than 100 μm (such as less than 70 μm, typically are less than 60 μm).In addition, consider the operability during making of double-sided adhesive sheet, above-mentioned thickness is preferably more than 10 μm (such as more than 25 μm, typically are more than 40 μm).As the advantage of the manufacture method of double-sided adhesive sheet disclosed herein, from the viewpoint of operability when manufacturing, can enumerate: (namely thickness the is less) base material than direct method thinner thickness can be adopted.Such as, in the manufacture method of double-sided adhesive sheet disclosed herein, thickness can be used to be the porous substrate of 10 μm ~ 55 μm (such as 10 μm ~ 50 μm, typically are 15 ~ 50 μm).The porous substrate of such minimal thickness is the material of the slimming of applicable double-sided adhesive sheet.In addition, the double-sided adhesive sheet that the balance (more preferably also having exterior quality) of bond properties and releasable is excellent is easily realized, therefore preferably.

Phenomenon broken from the viewpoint of the process prevented when double-sided adhesive sheet is peeled off again, as the integrant of this double-sided adhesive sheet, preferred working strength much higher hole base material.Such as, tensile strength is preferably for tensile strength (MD tensile strength, the t of flow direction _mD; Also can be understood as the tensile strength in longitudinally (direction orthogonal with TD)) and tensile strength (TD tensile strength, the t of transverse direction _tD) be more than 0.45kgf/15mm (more preferably more than 0.50kgf/15mm).The upper limit of tensile strength is not particularly limited, and considers cost and lightweight, usually preferably can adopt t _mDand t _tDbe the porous substrate of about below 1.0kgf/15mm (typically being below 0.80kgf/15mm, such as below 0.70kgf/15mm).Double-sided adhesive sheet disclosed herein can preferably to have t _mDand t _tDthe mode being the porous substrate of 0.45 ~ 0.80kgf/15mm (such as 0.50 ~ 0.70kgf/15mm) is implemented.The double-sided adhesive sheet of bond properties and releasable is realized with high-level equilibrium while described double-sided adhesive sheet can become light weight.

The above-mentioned tensile strength t of above-mentioned porous substrate _tDwith t _mDratio (aspect ratio (t _tD/ t _mD)) preferably significantly do not depart from 1.Such as, preferably t can be adopted _tD/ t _mDsuch as, porous substrate in 0.8 ~ 1.2 (typically being 0.8 ~ 1.1,0.9 ~ 1.1) scope.There is the double-sided adhesive sheet of the little porous substrate of the directional dependence of such tensile strength, when peeling off from adherend, being not easy the difference producing the releasable caused by its direction of delaminate.Therefore, can more play consistently good releasable, can prevent the stripping of double-sided adhesive sheet from damaging better.

The tensile strength of porous substrate can measure as follows.That is, make the flow direction of porous substrate (MD) consistent with length direction, this porous substrate is cut into the band shape of width 15mm, and it can be used as test film.This test film is arranged to (chuck spacing 180mm) on tensile testing machine, according to JIS P8113, under the condition of draw speed 20mm/ minute, measures tensile strength (MD tensile strength) t along its length _mD(kgf/15mm; At this, 1kgf is about 9.8N).In addition, making the width of porous substrate (TD) consistent with length direction, for this non-woven fabrics being cut into the band shape of width 15mm and the test film obtained, similarly measuring tensile strength (TD tensile strength) t of width _tD(kgf/15mm).Pass through t again _tDdivided by t _mD(t _tD/ t _mD) aspect ratio of tensile strength calculated.Should use the same method in embodiment described later.

Above-mentioned porous substrate is for tear strength (MD tear strength) s of longitudinal direction _mDwith tear strength (TD tear strength) s of transverse direction _tDin any one be all preferably more than 350mN, more preferably more than 400mN.The upper limit of tear strength is not particularly limited, and considers cost, lightweight, usually preferably can adopt s _mDand s _tDbe the porous substrate of about below 700mN (typically being below 600mN, such as below 500mN).Double-sided adhesive sheet disclosed herein can preferably to have s _mDand s _tDthe mode being the porous substrate of 350 ~ 600mN (such as 400 ~ 500mN) is implemented.The double-sided adhesive sheet of bond properties and releasable is realized with high-level equilibrium while described double-sided adhesive sheet can become light weight.

The above-mentioned tear strength s of above-mentioned porous substrate _tDwith s _mDratio (aspect ratio (s _tD/ s _mD)) preferably significantly do not depart from 1.Such as, preferably s can be adopted _tD/ s _mDporous substrate in 0.8 ~ 1.2 scope.There is the double-sided adhesive sheet of the little porous substrate of the directional dependence of such tear strength, when peeling off from adherend, being not easy the difference producing the releasable caused by its direction of delaminate.Therefore, can more play consistently good releasable, can prevent the stripping of double-sided adhesive sheet from damaging better.

The tear strength of porous substrate can measure as follows.That is, use Elmendorf type trier, according to JIS P8116 " the tear strength test method of paper and cardboard ", measure the tear strength of each porous substrate.More specifically, each porous substrate is cut into width 63mm, thus makes test film.23 DEG C, under the condition determination of 65%RH, above-mentioned test film is arranged on Elmendorf tear resistance test machine (trier that such as Tester Industry Co., Ltd manufactures), under condition jaggy, measure the tear strength (MD tear strength) to length direction (MD) and the tear strength (TD tear strength) to width (TD) respectively.Should use the same method in embodiment described later.

The loose density (can be calculated divided by thickness by basic weight) of above-mentioned porous substrate is generally about 0.20 ~ about 0.50g/cm ³be suitable, be preferably about 0.25 ~ about 0.40g/cm ³.When loose density is too low, sometimes may be difficult to realize one or both in above-mentioned preferred tensile strength and tear strength.On the other hand, when loose density is too high, the infiltration of tackiness agent in porous substrate is easily insufficient, result, sometimes may cause releasable decline, exterior quality variation etc.Consider from described viewpoint, particularly preferably use loose density to be about 0.25 ~ about 0.35g/cm ³(such as about 0.25 ~ about 0.30g/cm ³) porous substrate.

As the porous substrate in technology disclosed herein, air permeance resistance (Gurley) R that the working sample four these porous substrates overlaps obtained is measured preferably can be adopted ₁the air permeance resistance R obtained divided by the lamination sheets number (namely 4) of porous substrate in this working sample _1/4it is the porous substrate of 0.02 second ~ 0.07 second (more preferably 0.03 second ~ 0.07 second).At this, above-mentioned air permeance resistance (Gurley) R ₁can pass through according to the Gurley trier method specified in JIS P8117:1998, use commercially available Gurley trier (preferred Type B) to measure a certain amount of air by the time needed for working sample (working sample in this case four porous substrates overlaps obtained) typically, and carry out calculating and obtaining.

The porous substrate that air permeance resistance is so little, the infiltration of tackiness agent in this porous substrate is good.Therefore, the double-sided adhesive sheet being filled with (that is, residual space is few) tackiness agent in the interfibrous space of this porous substrate more fully is easily obtained.Described double-sided adhesive sheet can become the double-sided adhesive sheet of releasable better (such as, even if bounding force height is also not easy to produce interlaminar failure or fragmentation) compared with the double-sided adhesive sheet many with space residual in porous substrate.In addition, exterior quality (such as, the transparency) better double-sided adhesive sheet can be become.In addition, there is above-mentioned air permeance resistance R _1/4the ventilation property of porous substrate excellent, therefore in the drying of binder composition (the first binder layer formation composition) carried out under the state of this porous substrate of contact, can allow well the solvent composition gasified in this binder composition through.The air permeance resistance of porous substrate can by basic weight, such as use raw fibre proterties (kinds of fibers, Fibre diameter, orientation etc.), with or without adjustments such as making beating and degree thereof.

Above-mentioned porous substrate can also contain the resinous principles such as starch (such as, cationic starch), polyacrylamide, viscose glue, polyvinyl alcohol, urea-formaldehyde resin, terpolycyantoamino-formaldehyde resin, polyamide-polyamine-Epicholorohydrin except above-mentioned formation fiber.Above-mentioned resinous principle can work as the paper power toughener of this porous substrate.By using described resinous principle as required, the intensity (such as, tensile strength and tear strength one or both) of porous substrate can be regulated.Porous substrate in technology disclosed herein can also contain the general additive in the field relevant to the manufacture of non-woven fabrics such as yield rate rising agent, drainage agent, viscosity modifier, dispersion agent in addition as required.

Binder layer (can comprise the first binder layer and the second binder layer) in technology disclosed herein can for the binder layer formed by aqueous adhesive composition or Solvent Adhesive composition.Aqueous adhesive composition refers to the binder composition of the form containing tackiness agent (binder layer forming component) in the solvent (aqueous solvent) using water as main component.In the concept of this said aqueous adhesive composition, the binder composition being called water-dispersed pressure-sensitive adhesive composition (tackiness agent is scattered in the composition of the form in water), aqueous adhesive composition (composition of the form that tackiness agent is dissolved in the water) etc. can be comprised.In addition, Solvent Adhesive composition refers to the binder composition of the form in organic solvent containing tackiness agent.

In addition, in technology disclosed herein, the kind of tackiness agent contained in binder layer is not particularly limited.Such as, can be containing selection from the various polymkeric substance (binding property polymer) such as the acrylic acid or the like that can work as adhesive composition, polyester, polyurethanes, polyethers, rubber-like, polysiloxane-based, polyamide-based, fluorine-containing type one or more based on the tackiness agent of polymkeric substance.In a preferred embodiment, the main component of described binder layer is acrylic adhesives.Technology disclosed herein, can preferably implement with the form with the double-sided adhesive sheet of the binder layer comprising in fact acryloid cement.Above-mentioned binder layer typically is the binder layer formed by the binder composition containing binding property polymer (preferred acrylic polymers).

At this, " acrylic adhesives " refers to the tackiness agent of polymkeric substance (namely the main component in component of polymer accounts for the composition more than 50 quality %) based on acrylic polymers." acrylic polymers " refers to the monomer in a part with at least one (methyl) acryl (following; sometimes be referred to as " acrylic monomer ") as the polymkeric substance of main composition monomer component (namely monomer main component forms in the monomer total amount of acrylic polymers the composition accounted for more than 50 quality %).In addition, in this specification sheets, " (methyl) acryl " is the implication briefly representing acryl and methacryloyl.Similarly, " (methyl) acrylate " is the implication briefly representing acrylate and methacrylic ester.

Described acrylic polymers is typically using (methyl) alkyl acrylate as the polymkeric substance of main composition monomer component.As above-mentioned (methyl) alkyl acrylate, can the preferred compound that represents as shown in the formula (1) of example.

CH ₂＝C(R ¹)COOR ² (1)

At this, the R in above-mentioned formula (1) ¹for hydrogen atom or methyl.R ²for the alkyl of carbonatoms 1 ~ 20.The viewpoint of the tackiness agent that the bond properties that is easy to get calmly is excellent is considered, preferred R ²for such carbon atom number range (is expressed as C by carbonatoms 2 ~ 14 below sometimes _2-14) (methyl) alkyl acrylate of alkyl.As C _2-14the concrete example of alkyl, can enumerate: ethyl, propyl group, sec.-propyl, normal-butyl, isobutyl-, sec-butyl, the tertiary butyl, n-pentyl, isopentyl, neo-pentyl, n-hexyl, n-heptyl, n-octyl, iso-octyl, 2-ethylhexyl, n-nonyl, different nonyl, positive decyl, isodecyl, n-undecane base, dodecyl, n-tridecane base, n-tetradecane base etc.

In a preferred embodiment, in the monomer total amount used in the synthesis of acrylic polymers, more than about 50 quality % (typically being about 50 ~ about 99.9 quality %), more preferably from about more than 70 quality % (typically being about 70 ~ about 99.9 quality %), such as more than about 85 quality % (typically being about 85 ~ about 99.9 quality %) are by the R be selected from above formula (1) ²for C _2-14(methyl) acrylate (more preferably (methyl) vinylformic acid C of alkyl _4-10alkyl ester, one or both particularly preferably in butyl acrylate and 2-EHA) one or more occupy.By being made up of the acrylic polymers obtained such monomer, easily form the tackiness agent of the good adhesion characteristic of display, therefore preferably.

As the acrylic polymers in technology disclosed herein, can preferably adopt copolymerization to have to have the acrylic polymers of the acrylic monomer of hydroxyl (-OH).As the concrete example of acrylic monomer with hydroxyl, can enumerate: (methyl) vinylformic acid 2-hydroxy methacrylate, (methyl) vinylformic acid 2-hydroxy propyl ester, (methyl) vinylformic acid 3-hydroxy propyl ester, (methyl) vinylformic acid 2-hydroxybutyl, (methyl) vinylformic acid 4-hydroxybutyl, the own ester of (methyl) vinylformic acid 2-hydroxyl, the own ester of (methyl) vinylformic acid 6-hydroxyl, (methyl) vinylformic acid 8-hydroxyl monooctyl ester, (methyl) vinylformic acid 10-hydroxyl ester in the last of the ten Heavenly stems, (methyl) vinylformic acid 12-hydroxylauric ester, vinylformic acid (4-hydroxymethylcyclohexyl) methyl esters, polypropylene glycol list (methyl) acrylate, N-hydroxyethyl (methyl) acrylamide, N-hydroxypropyl (methyl) acrylamide etc.Described hydroxy acryl acid class monomer can be used alone one, also can combinationally use two or more.

There is the acrylic polymers of such hydroxy acryl acid class monomer by copolymerization, easily obtain the tackiness agent that balance is excellent, releasable is excellent of bounding force and cohesive force, therefore preferably.As particularly preferred hydroxy acryl acid class monomer, can enumerate: (methyl) hydroxyalkyl acrylates such as (methyl) vinylformic acid 2-hydroxy methacrylate, (methyl) vinylformic acid 2-hydroxy propyl ester, (methyl) vinylformic acid 3-hydroxy propyl ester, (methyl) vinylformic acid 2-hydroxybutyl, (methyl) vinylformic acid 4-hydroxybutyl.Such as, (methyl) hydroxyalkyl acrylate of the straight chained alkyl that can preferably use the alkyl in above-mentioned hydroxyalkyl to be carbonatoms 2 ~ 4.

In the monomer total amount that such hydroxy acryl acid class monomer preferably uses in relative to the synthesis of acrylic polymers about 0.001 ~ about 10 quality % scope in use.Thus, the double-sided adhesive sheet with higher level balance those bounding force and cohesive force can be realized.By the usage quantity of hydroxy acryl acid class monomer being set as about 0.01 ~ about 5 quality % (such as about 0.05 ~ about 2 quality %), better result can be realized.

Significantly not damaging in the scope of effect of the present invention, in the acrylic polymers in technology disclosed herein, copolymerization monomer other than the above (other monomer) can be had.Described monomer can in order to such as regulate the Tg of acrylic polymers, regulate the objects such as bond properties (such as separability) and use.Such as, as the monomer of the cohesive force and thermotolerance that can improve tackiness agent, can enumerate containing sulfonic group monomer, phosphorous acid-based monomers, cyano-containing monomer, vinyl ester, aromatic ethenyl compound etc.In addition, or can contribute to improving the monomer of adhesive power as the functional group of crosslinked basic point as introducing in acrylic polymers, can enumerate carboxyl group-containing monomer, containing anhydride group monomer, amide-containing monomer, emulsion stability, containing imide monomer, containing epoxy based monomers, (methyl) acryloyl morpholine, vinyl ethers etc.

As containing sulfonic group monomer, can illustrate: styrene sulfonic acid, allyl sulphonic acid, 2-(methyl) acrylamide-2-methylpro panesulfonic acid, (methyl) acryamidopropanesulfonic acid, (methyl) sulfopropyl acrylate, (methyl) propane sulfonic acid, sodium vinyl sulfonate etc.

As phosphorous acid-based monomers, can illustrate: acryloyl phosphoric acid 2-hydroxy methacrylate.

As cyano-containing monomer, can illustrate: vinyl cyanide, methacrylonitrile etc.

As vinyl ester, can illustrate: vinyl-acetic ester, propionate, vinyl laurate etc.

As aromatic ethenyl compound, can illustrate: vinylbenzene, chloro-styrene, 1-chloro-4-methyl-benzene, alpha-methyl styrene, other substituted phenylethylene etc.

In addition, as carboxyl group-containing monomer, can illustrate: vinylformic acid, methacrylic acid, (methyl) carboxyethyl acrylates, (methyl) vinylformic acid carboxyl pentyl ester, methylene-succinic acid, toxilic acid, fumaric acid, β-crotonic acid, iso-crotonic acid etc.

As containing anhydride group monomer, can enumerate: the acid anhydrides etc. of maleic anhydride, itaconic anhydride, above-mentioned carboxyl group-containing monomer.

As amide-containing monomer, can illustrate: acrylamide, Methacrylamide, acrylamide, NVP, N, N-DMAA, N, N-dimethylmethacryl amide, N, N-acrylamide, N, N-diethyhnethacrylamide, N, N '-methylene-bisacrylamide, N, N-dimethylaminopropylacryl acid amides, N, N-dimethylaminopropyl Methacrylamide, diacetone-acryloamide(DAA) etc.

As emulsion stability, can illustrate: (methyl) acrylate, (methyl) vinylformic acid N, N-dimethylamino ethyl ester, (methyl) vinylformic acid N, N-dimethylamino propyl ester etc.

As containing imide monomer, can illustrate: N-cyclohexylmaleimide, isopropylmaleimide, N-N-cyclohexylmaleimide, clothing health imide etc.

As containing epoxy based monomers, can illustrate: (methyl) glycidyl acrylate, (methyl) vinylformic acid methylglycidyl esters, allyl glycidyl ether etc.

As vinyl ethers, can illustrate: methylvinylether, ethyl vinyl ether, IVE etc.

" other monomer " like this can be used alone one, also can be used in combination.As the content of other monomer entirety above-mentioned, below about 40 quality % (typically being about 0.001 ~ about 40 quality %) are preferably in for the synthesis of the monomer total amount of acrylic polymers, be more preferably below about 30 quality % (typically being about 0.01 ~ about 30 quality %, such as about 0.1 ~ about 10 quality %).When using carboxyl group-containing monomer as other monomer above-mentioned, its content such as can be set as 0.1 ~ 10 quality % in above-mentioned monomer total amount, is usually set as that 0.5 ~ 5 quality % is suitable.In addition, when using vinyl ester (such as vinyl-acetic ester) as other monomer above-mentioned, its content such as can be set as 0.1 ~ 20 quality % in above-mentioned monomer total amount, is usually set as that 0.5 ~ 10 quality % is suitable.

It is suitable that the copolymerization composition of aforesaid propylene acids polymers carries out designing in the mode that the second-order transition temperature of this polymkeric substance (Tg) is less than-15 DEG C (typically being-70 DEG C ~-15 DEG C), preferably less than-25 DEG C (such as-60 DEG C ~-25 DEG C), more preferably less than-40 DEG C (such as-60 DEG C ~-40 DEG C).When the Tg of acrylic polymers is too high, sometimes may the bounding force (bounding force under such as low temperature environment, bounding force etc.) to uneven surface of tackiness agent containing polymkeric substance based on this acrylic polymers easily decline.When the Tg of acrylic polymers is too low, sometimes may above-mentioned tackiness agent curved surface tackiness decline or releasable easily decline (such as producing generation of adhesive deposit).

The Tg of acrylic polymers can be regulated by appropriate change monomer composition (that is, the kind of the monomer used in the synthesis of this polymkeric substance, usage quantity than).At this, the Tg of acrylic polymers refers to the value that the Tg of homopolymer (homopolymer) and the massfraction (copolymerization ratios of quality criteria) of this monomer based on each monomer forming this polymkeric substance are obtained by Fox formula.As the Tg of homopolymer, adopt the value recorded in known data.

In technology disclosed herein, as the Tg of above-mentioned homopolymer, adopt following value particularly.

For above-mentioned illustrative beyond the Tg of homopolymer, adopt the numerical value recorded in " Polymer Handbook (polymer handbook) " (the 3rd edition, Wiley & Sons, Inc, 1989).

" Polymer Handbook (polymer handbook) " (the 3rd edition, Wiley & Sons, Inc, 1989) in when not recording yet, adopt the value (see Japanese Unexamined Patent Publication 2007-51271 publication) obtained by following measuring method.

Specifically, in the reactor with thermometer, agitator, nitrogen introducing tube and reflux condensing tube, drop into 100 mass parts monomers, 0.2 mass parts Diisopropyl azodicarboxylate and 200 mass parts as the ethyl acetate of polymer solvent, while passing into nitrogen, stir 1 hour.By this way by after the oxygen removing in polymerization system, be warmed up to 63 DEG C of reactions 10 hours.Then, cool to room temperature, obtains the homopolymer solution that solid component concentration is 33 quality %.Then, this homopolymer solution casting is applied on release liner also dry, thus makes the sample (homopolymer of sheet) that thickness is about 2mm.Be the discoid of diameter 7.9mm by this sample stamping-out, clamp with parallel plate, (レ オ メ ト リ ッ Network ス company manufactures to use test for viscoelastic machine, trade(brand)name " ARES "), in the temperature range of-70 DEG C ~ 150 DEG C, visco-elasticity is measured by shear mode with the heat-up rate of 5 DEG C/min, using the Tg of the summit temperature of tan δ (loss tangent) as homopolymer while the shear strain applying frequency 1Hz.

Tackiness agent in technology disclosed herein preferably shears loss Young's modulus G with it " summit temperature be that the mode of less than-10 DEG C (typically being-40 DEG C ~-10 DEG C) designs.Such as, with above-mentioned summit temperature be preferably the tackiness agent of patten's design of-35 DEG C ~-15 DEG C.In this manual, shear loss Young's modulus G " summit temperature can grasp in the following manner: be the discoid of diameter 7.9mm by the sheet tackiness agent stamping-out of thickness 1mm, clamp with parallel plate, (レ オ メ ト リ ッ Network ス company manufactures to use above-mentioned test for viscoelastic machine, trade(brand)name " ARES "), while the shear strain applying frequency 1Hz, in temperature range-70 DEG C ~-150 DEG C, utilize shear mode to measure loss Young's modulus G with the heat-up rate of 5 DEG C/min " temperature dependency, obtain corresponding to its summit temperature (G " curve reach very big time temperature).In addition, the shearing loss Young's modulus G of acrylic polymers " summit temperature can be regulated by appropriate change monomer composition (that is, the kind of the monomer used in the synthesis of this polymkeric substance, usage quantity than).

The method obtaining having the acrylic polymers of described monomer composition is not particularly limited, and can suitably adopt solution polymerization process, emulsion polymerization, mass polymerization, suspension polymerization etc. as the known various polymerization processs of the synthetic method of acrylic polymers.Such as, preferably solution polymerization process can be adopted.As monomer supply method when carrying out solution polymerization, fed batch mode, continuously supply (droppings) mode, the segmentation once supplied by whole raw material monomer can be suitably adopted to supply (dropping) mode etc.Polymerization temperature suitably can be selected according to the monomer used and the kind of solvent, the kind of polymerization starter etc., such as, can be set as about 20 DEG C ~ about 170 DEG C (typically being about 40 DEG C ~ about 140 DEG C).

The solvent used in solution polymerization suitably can be selected from known or usual organic solvent.Can use such as: be selected from any one solvent of the ketones such as ethers, methylethylketone, methyl ethyl diketone such as the lower alcohols such as the aliphatics such as the aromatics such as toluene, dimethylbenzene class (typically arene), ethyl acetate, hexane, hexanaphthene, methylcyclohexanone or the haloalkane such as alicyclic hydro carbons, 1,2-ethylene dichloride hydro carbons, Virahol, n-butyl alcohol, sec-butyl alcohol, the trimethyl carbinol (such as the unary alcohol of carbonatoms 1 ~ 4), t-butyl methyl ether etc. or two or more mixed solvents.The organic solvent of boiling point under preferred use total pressure 1 normal atmosphere in the scope of 20 ~ 200 DEG C (more preferably 25 ~ 150 DEG C) (can be mixed solvent).

The initiator used during polymerization suitably can be selected from known or usual polymerization starter according to the kind of polymerization process.Can preferably use such as: azo type polymerization initiator.As the concrete example of azo type polymerization initiator, can enumerate: 2, 2 '-Diisopropyl azodicarboxylate, 2, two (the 2-methyl-prop amidine) dithionate of 2 '-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 N of 2 '-azo, N '-dimethyleneisobutylamidine), 2, two [N-(2-the carboxy ethyl)-2-methyl-prop amidine] hydrate of 2 '-azo, 2, two (the 4-methoxyl group-2 of 2 '-azo, 4-methyl pentane nitrile), 2, 2 '-azo two (2, 4-methyl pentane nitrile), 2, 2 '-azo two (2-methylbutyronitrile), 1, 1 '-azo two (hexanaphthene-1-formonitrile HCN), 2, 2 '-azo two (2, 4, 4-trimethylpentane), 2, two (2 Methylpropionic acid) dimethyl esters of 2 '-azo etc.

As other example of polymerization starter, can enumerate: the persulphate such as Potassium Persulphate, ammonium persulphate; Benzoyl peroxide, tertbutyl peroxide, di-t-butyl peroxide, t-butyl per(oxy)benzoate, dicumyl peroxide, 1,1-bis(t-butylperoxy)-3,3, the peroxide type initiators such as 5-trimethyl-cyclohexane, 1,1-bis(t-butylperoxy) cyclododecane, hydrogen peroxide; Phenyl replaces ethane etc. and replaces ethane initiator; Aromatic carbonyl; Deng.As the other example of polymerization starter, can enumerate: the redox type initiator that superoxide and reductive agent combine.As the example of described redox type initiator, can enumerate: the combination etc. of the combination (combination etc. of aqueous hydrogen peroxide solution and iron (II) salt) of the combination (combination etc. of aqueous hydrogen peroxide solution and xitix) of superoxide and xitix, superoxide and iron (II) salt, persulphate and sodium bisulfite.

Such polymerization starter can be used alone one or is used in combination.Such as, as long as the common usage quantity of the usage quantity of polymerization starter, relative to whole monomer component 100 mass parts, can select in the scope of about 0.005 ~ about 1 mass parts (typically about 0.01 ~ about 1 mass parts).

The polymerization liquid that acrylic polymers is dissolved in the mode of organic solvent is obtained by described solution polymerization.As the acrylic polymers in technology disclosed herein, preferably can use above-mentioned polymerization liquid or the reaction solution after suitable aftertreatment is carried out to this reaction solution.Typically, the solution containing acrylic polymers after enforcement aftertreatment is adjusted to suitable viscosity (concentration) to use afterwards.Or, polymerization process (such as letex polymerization, photopolymerization, mass polymerization etc.) the synthesizing propylene acids polymers beyond solution polymerization process can be utilized, and use after this polymer dissolution is prepared into solution shape in organic solvent.

Acrylic polymers in technology disclosed herein, when its weight-average molecular weight (Mw) is too small, the cohesive force of possibility tackiness agent is not enough thus easy in adherend surface generation generation of adhesive deposit sometimes, or curved surface tackiness easily declines.On the other hand, when Mw is excessive, sometimes easily may decline to the bounding force of adherend.In order to balance bond properties and releasable with high level, preferred Mw is 10 × 10 ⁴above and 500 × 10 ⁴acrylic polymers in following scope.Be 20 × 10 by Mw ⁴above and 100 × 10 ⁴below (such as 30 × 10 ⁴above and 70 × 10 ⁴acrylic polymers below), can realize better result.In addition, in this specification sheets, Mw refers to the value that the polystyrene standard obtained by GPC (gel permeation chromatography) is converted.

Binder composition in technology disclosed herein can for the composition containing tackifying resin.As tackifying resin, be not particularly limited, can use such as: rosin based, terpenes, hydro carbons, epoxies, polyamide-based, the various tackifying resin such as elastomerics class, phenolic, keto-aldehyde class.Such tackifying resin can be used alone one or is used in combination.

As the concrete example of rosin based tackifying resin, can enumerate: the unmodified rosin (pine gum) such as gum resin, wood rosin, starex; These unmodified rosin are carried out modification by hydrogenation, disproportionation, polymerization etc. and the modified rosin (rosin etc. of staybelite, nilox resin, polymerized rosin, other chemically modified) obtained; Other various rosin derivative; Deng.As the example of above-mentioned rosin derivative, can enumerate: the rosin ester class such as the material (i.e. the carboxylate of rosin) unmodified rosin esterification obtained with alcohols, material (i.e. the carboxylate of modified rosin) of modified rosin (staybelite, nilox resin, polymerized rosin etc.) esterification being obtained with alcohols; By the unsaturated fatty acids modified rosin class that unmodified rosin or modified rosin (staybelite, nilox resin, polymerized rosin etc.) modification obtain by unsaturated fatty acids; By the unsaturated fatty acids modified rosin ester class that rosin esters modification obtains by unsaturated fatty acids; Carboxyl in unmodified rosin, modified rosin (staybelite, nilox resin, polymerized rosin etc.), unsaturated fatty acids modified rosin class or unsaturated fatty acids modified rosin ester class is carried out reduction treatment and the rosin alcohols obtained; The metal-salt of the rosin based (particularly rosin ester class) such as unmodified rosin, modified rosin, various rosin derivatives; The rosin phenol resins obtained by utilizing acid catalyst to make rosin based (unmodified rosin, modified rosin, various rosin derivatives etc.) and phenol addition thermopolymerization; Deng.

As the example of terpenes tackifying resin, can enumerate: the terpenoid resins such as α-pinene polymkeric substance, beta-pinene polymer, Dipentine (ジ ペ Application テ Application) polymkeric substance; By these terpenoid resin modifications (phenol modification, aromatic modified, hydrogenation modification, hydrocarbon modification etc.) and the modified terpene resinoid obtained; Deng.As the resinoid example of above-mentioned modified terpene, can enumerate: terpene phenolic resinoid, styrenated terpene resinoid, aromatic modified terpenoid resin, hydriding terpene resinoid etc.

As the example of hydrocarbon tackifying resin, can enumerate: the various hydrocarbon resins such as aliphatic category hydrocarbon resin, fragrant same clan hydrocarbon resin, aliphatic category cyclic hydrocarbon resin, aliphatic/aromatic class petroleum resin (styrene-olefin analog copolymer etc.), aliphatics/alicyclic ring same clan petroleum resin, hydrogenated hydrocarbons resin, coumarone resinoid, coumarone-indenes resinoid.As aliphatic category hydrocarbon resin, the polymkeric substance etc. being selected from the alkene of carbonatoms about 4 ~ about 5 and one or more aliphatic hydrocarbons of diene can be illustrated.As the example of above-mentioned alkene, can enumerate: 1-butylene, iso-butylene, 1-amylene etc.As the example of above-mentioned diene, can enumerate: divinyl, 1,3-pentadiene, isoprene etc.As the example of fragrant same clan hydrocarbon resin, can enumerate: the polymkeric substance etc. containing vinylaromatic hydrocarbon (vinylbenzene, Vinyl toluene, alpha-methyl styrene, indenes, methyl indenes etc.) of carbonatoms about 8 ~ about 10.As the example of aliphatic category cyclic hydrocarbon resin, can enumerate: the alicyclic hydrocarbon resin obtained carrying out being polymerized after so-called " C4 petroleum fractions " or " C5 petroleum fractions " Cyclodimerization; The polymkeric substance of cyclic diene compound (cyclopentadiene, dicyclopentadiene, ethylidene norbornene, Dipentine etc.) or its hydrogenation products; By the aromatic nucleus hydrogenation of fragrant same clan hydrocarbon resin or aliphatic/aromatic class petroleum resin and the alicyclic hydrocarbon resin obtained; Deng.

In technology disclosed herein, softening temperature (softening temperature) can be preferably used to be the tackifying resin of more than about 80 DEG C (preferably more than about 100 DEG C).By described tackifying resin, more high performance (such as tackiness is higher) adhesive sheet can be realized.The upper limit of the softening temperature of tackifying resin is not particularly limited, and can be set as such as less than about 200 DEG C (typically being less than about 180 DEG C).In addition, be defined as at the softening temperature of this said tackifying resin the value that the softening point test method (ring and ball method) that specifies any one of JIS K5902 and JISK2207 measures.

The usage quantity of tackifying resin is not particularly limited, and suitably can set according to target bond properties (adhesive power etc.).Such as, take solids component as benchmark, preferably use tackifying resin with the ratio being about 10 ~ about 100 mass parts (more preferably from about 15 ~ about 80 mass parts, further preferably about 20 ~ about 60 mass parts) relative to 100 mass parts acrylic polymerss.

Linking agent can be used as required in above-mentioned binder composition.The kind of linking agent is not particularly limited, can from known or usual linking agent (such as, isocyanates linking agent, epoxies linking agent, azoles quinoline class linking agent, aziridines linking agent, melamine class linking agent, peroxide linking agent, ureas linking agent, metal alkoxide class linking agent, metallo-chelate class linking agent, metallic salt linking agent, carbodiimide class linking agent, amine cross-linking agent etc.) in suitable choice for use.Linking agent can be used alone one or is used in combination.The usage quantity of linking agent is not particularly limited, such as, relative to 100 mass parts acrylic polymerss, and can the interior selection of the scope of (such as about 0.005 ~ about 10 mass parts, preferably about 0.01 ~ about 5 mass parts) below about 10 mass parts.

The common various additives in the binder composition fields such as flow agent, crosslinking coagent, softening agent, tenderizer, weighting agent, tinting material (pigment, dyestuff etc.), antistatic agent, antiaging agent, UV light absorber, antioxidant, photostabilizer can be contained as required in above-mentioned binder composition.About so various additives, can use existing known additive according to conventional methods, this and non-specifically give the content of feature of the present invention, therefore detailed.

The NV of binder composition considers the infiltration in porous substrate, the surface smoothness, productivity etc. of dried binder layer are preferably set to 25 ~ 60 quality % (such as 30 ~ 50 quality % typically are 30 ~ 40 quality %).When the solids component of binder composition is too low, produce a large amount of bubble, cause surface smoothness to decline, bond properties may be made to decline.The generation of above-mentioned bubble also may make the appearance degradation of double-sided adhesive sheet.In addition, be 0.1 ~ 100Pas (such as 1 ~ 50Pas, typically is 5 ~ 30Pas) under the viscosity of above-mentioned binder composition is preferably set to room temperature (23 DEG C) based on the viewpoint substantially identical with above-mentioned NV.

Below, an optimal way for the manufacture method of double-sided adhesive sheet disclosed herein is described.The first surface that this manufacture method is included in porous substrate forms the operation (the first binder layer formation process) of the first binder layer and forms the operation (the second binder layer formation process) of the second binder layer second of porous substrate.

For the preference of the operation of formation first binder layer, be described with reference to Fig. 3.A part for the manufacturing installation 40 of double-sided adhesive sheet shown in Fig. 3.At this, under the state supported by the release liner 31 as peelable supporter, the first binder layer 21 is infiltrated up to the state in porous substrate 10 with its part and is formed.As shown in Figure 3, manufacturing installation 40 has coating part 50, sticking part 60 and dryer part 70.In addition, the porous substrate 10 of release liner volume 80 and sheet that the release liner 31 that manufacturing installation 40 has sheet is wound as drum is wound as the rolls 90 of drum.

In above-mentioned first binder layer formation process, first, roll up 80 by release liner and carry release liner 31 to coating part 50.As peelable supporter, can release liner that suitably choice for use is known or usual in double-sided adhesive sheet field or technique paper using.In addition, technique paper using refers to temporary transient maintenance binder composition or binder layer in the manufacturing processed of adhesive sheet, is not included in as the supporter in the adhesive sheet of end article.As peelable supporter, can preferably use such as: the supporter carrying out the formation of lift-off processing on the surface of supporter base material as required.In this embodiment, two-sided strippable release liner 31 is used.

As the supporter base material (lift-off processing object) forming above-mentioned peelable supporter, can the suitably various resin film class of choice for use, stationery, dry goods, sheet rubber class, foamed sheet class, tinsel, their mixture (such as, having the sheet of the stepped construction of olefin resin at the two sides lamination of paper) etc.Above-mentioned lift-off processing can use known or usual stripping treatment agent (such as, polysiloxane-based, the stripping treatment agent such as fluorine-containing type, chain alkyl class) to be undertaken by ordinary method.Such as, in the double-sided adhesive sheet shown in Fig. 2, preferably can adopt the release liner obtained without the polysiloxane-based stripper of wood pulp paper carries out processing two sides lamination being had polyethylene (PE) resin.In addition, can by olefine kind resin (such as, PE, polypropylene (PP), ethylene-propylene copolymer, PE/PP mixture), the low tackiness base material such as fluoropolymer (such as, tetrafluoroethylene, poly(vinylidene fluoride)) uses as peelable supporter when not carrying out lift-off processing to the surface of base material.Or, can use and the base material after lift-off processing is implemented to described low tackiness base material.Above-mentioned peelable supporter typically is non-hygroscopic.From the viewpoint of workability etc., the thickness of peelable supporter is set as that about 50 μm ~ about 200 μm (more preferably from about 60 μm ~ about 160 μm) are suitable.

The binder layer side surface (in other words, applying the face of binder composition) of peelable supporter and/or the arithmetic mean surface roughness at the back side are less than 1 μm.Above-mentioned arithmetic mean surface roughness be preferably 0.05 μm ~ 0.75 μm (such as about 0.05 μm ~ about 0.5 μm, typically be about 0.1 μm ~ about 0.3 μm).By adopting described formation, the smoothness of adhesive layer surface (sticking veneer) also uprises, diminish from stress-deviation during adherend sur-face peeling, can avoid causing due to local stress a part for tackiness agent disconnect thus remain in the phenomenons such as adherend side.Therefore, the double-sided adhesive sheet using the peelable supporter with above-mentioned arithmetic mean surface roughness to make can not produce the pollutions such as generation of adhesive deposit on adherend surface after a procedure, can swimmingly from adherend sur-face peeling.In addition, in this specification sheets, arithmetic mean surface roughness can use common surface roughness measurement device (the non-contact three-dimensional surface-profile measuring instrument that such as Veeco company manufactures, model " Wyko NT-3300 ") to measure.

Then, above-mentioned binder composition is applied (being coated with typically) to (applying step) on peelable supporter.Particularly, as shown in Figure 3, the release liner 31 carried in the above described manner is by importing coating part 50 after deflector roll 95.In coating part 50, coating machine 51 is used to be applied on release liner 31 by binder composition 25.Thus, binder composition 25 is configured on release liner 31 with membranaceous.In addition, during coating, binder composition 25 can be typically the state with mobility of under room temperature (23 DEG C) aqueous (comprising pasty state).In addition, in this embodiment, as coating machine 51, use comma coater.

Binder composition is applied on peelable supporter and is not limited to use comma coater to apply.The such as known or usual coating machine such as gravure roll coating machine, reverse roll coating machine, touch roll coating machine, immersion roll-coater, metering bar coater, knife coater, spraying machine can be used to carry out.

Then, above-mentioned binder composition is made to contact porous substrate (contact operation).As long as above-mentioned binder composition be in drying terminate before the binder composition of state, can for being supplied to the binder composition of predrying operation.Above-mentioned binder composition can be typically the state with mobility of under room temperature (23 DEG C) aqueous (comprising pasty state).Such as, the binder composition (binder composition in other words, in above-mentioned contact operation contacted with above-mentioned porous substrate.Such as, binder composition before drying terminates) NV be preferably below 80 quality % (such as 25 ~ 80 quality %), more preferably below 60 quality % (such as 25 ~ 60 quality %), further preferred below 50 quality % (such as 30 ~ 50 quality %).In addition, binder composition in above-mentioned contact operation (such as, binder composition before drying terminates) viscosity be preferably set at room temperature (23 DEG C) based on the viewpoint substantially identical with above-mentioned NV under be 0.1 ~ 100Pas (such as 1 ~ 50Pas, typically is 5 ~ 30Pas).

In addition, above-mentioned binder composition (being about to the binder composition of the above-mentioned porous substrate of contact typically), from the viewpoint of the infiltration in porous substrate, preferably contacts with porous substrate under undried state.At this, undried state refers to: from be applied to (applying step) peelable supporter to porous substrate contact (contact operation), there is not the drying process of the active using moisture eliminator equal solvent removing means to make binder composition drying such.As mentioned above under non-drying regime, implementing contact operation, not only from the viewpoint of the infiltration of binder composition porous substrate, and is also useful from the viewpoint of production efficiency.In addition, in above-mentioned undried state, can comprise the situation that binder composition is dry by halves by predrying or seasoning etc.However, but consider place more than certain hour may to make that drying is carried out, production efficiency etc., preferred above-mentioned applying step and the above-mentioned interval contacting operation short.Such as, within above-mentioned applying step and the above-mentioned interval contacting operation are preferably 1 hour, more preferably within 30 minutes, further preferably within 10 minutes.In a particularly preferred mode, above-mentioned applying step is carried out continuously with the above-mentioned operation that contacts.

Above-mentioned contact operation, particularly as shown in Figure 3, fits to the porous substrate 10 carried from rolls 90 on the membranaceous binder composition 25 of release liner 31 coating.Now, by binder composition 25 is configured at below relative to porous substrate 10, can utilize the deadweight of porous substrate 10 that binder composition is infiltrated up in porous substrate 10 fully.Therefore, in this operation, do not need the crimping roller equipressure crimped with porous substrate 10 by binder composition 25 to take over section.

Then, by the binder composition drying (drying process) after contacting with porous substrate as mentioned above.In other words, by comprising peelable supporter, the duplexer that is arranged on membranaceous binder composition on this peelable supporter and stacked porous substrate is thereon supplied to drying process.The drying of binder composition manufactures the viewpoints such as efficiency consider preferably to carry out under heating from promotion crosslinking reaction, raising.Such as, as shown in Figure 3, in above-mentioned contact operation, when porous substrate 10 is configured in the top of binder composition 25, by proceeding to drying process in this condition, from binder composition 25, the solvent composition of gasification suitably can remove by having the porous substrate 10 of ventilation property.

Drying temperature in above-mentioned drying process is such as preferably set to more than about 40 DEG C (such as more than 50 DEG C, typically are more than 60 DEG C), is preferably set in addition less than about 120 DEG C (such as less than 100 DEG C, typically are less than 80 DEG C).Consider from viewpoints such as manufacture efficiency, be preferably set to time of drying less than about 30 minutes (preferably less than 20 minutes, such as less than 10 minutes).Drying temperature can be set make to carry out required drying within this time.Through above-mentioned drying process, form the first binder layer thus.

The second binder layer is formed on porous substrate after formation first binder layer.Specifically, the second binder layer is formed in second (with the face of first surface opposition side being formed with the first binder layer) of porous substrate.The formation method of the second binder layer is not particularly limited, and can apply existing known various method.Such as, as the binder composition of the second binder layer, from the binder composition that needless to say can preferably adopt in the scope illustrated in the above-mentioned binder composition (such as aqueous adhesive composition or Solvent Adhesive composition), non-solvent adhesive composition also can be adopted (such as not contain organic solvent, by irradiation ultraviolet radiation, electron rays isoreactivity energy-ray and the binder composition of type that solidifies; Hot-melt adhesive composition etc.) and the binder composition of other various form.By applying existing known means (means such as such as coating, drying, solidification), such binder composition can be formed the second binder layer.

Second binder layer can adopt such as: second at porous substrate directly applies binder composition and dry or solidification, form binder layer thus, and the method (direct method) of stacked release liner (can be above-mentioned peelable supporter) as required, or the binder layer formed on release liner is in advance pasted the surface of porous substrate, above-mentioned second binder layer is transferred to the method (transfer printing) etc. on this porous substrate.In transfer printing, above-mentioned release liner can be directly used in the protection of the second binder layer.Consider the combination with the first binder layer, then consider from the viewpoint such as surface smoothness, manufacture view, preferably can adopt transfer printing.In the formation of the second binder layer, the applying means (typically being the kind etc. of coating machine) of binder composition, drying means (typically being drying temperature, time) preferably can adopt the scope same with above-mentioned first binder layer, therefore omit repeat specification at this.

Surface (the adhesive face of the first binder layer disclosed herein, namely with the sticking veneer of adherend) arithmetic mean surface roughness be preferably less than 1 μm, more preferably about 0.05 μm ~ about 0.75 μm (such as about 0.05 μm ~ about 0.5 μm, typically be about 0.1 μm ~ about 0.3 μm) scope in.When the smoothness of adhesive face improves, the adaptation on this adhesive face and adherend surface improves.The high binder layer of smoothness, little from stress-deviation during adherend sur-face peeling, therefore can be avoided better because local stress causes a part for tackiness agent disconnect thus remain in the phenomenons such as adherend side.Therefore, the double-sided adhesive sheet with above-mentioned arithmetic mean surface roughness does not produce the pollutions such as generation of adhesive deposit on adherend surface, can peel off swimmingly from adherend.In addition, when second binder layer is formed by transfer printing, the arithmetic mean surface roughness of the second adhesive layer surface is preferably less than 1 μm, more preferably about 0.05 μm ~ about 0.75 μm (such as about 0.05 μm ~ about 0.5 μm, typically be about 0.1 μm ~ about 0.3 μm) scope in.

The thickness (hereinafter also referred to base material cladding thickness) of base material cover part in binder layer disclosed herein, each one side is set as that more than 20 μm is suitable.From the viewpoint of raising bond properties, above-mentioned thickness is preferably more than 25 μm, is more preferably more than 30 μm.The double-sided adhesive sheet of described formation can become the double-sided adhesive sheet of the better bond properties of display.In addition, above-mentioned thickness is set as that less than 150 μm is suitable, is preferably set to less than 100 μm (such as less than 75 μm).From the viewpoint of the lightweight (preferably slimming further) of double-sided adhesive sheet, preferably above-mentioned thickness is set as less than 70 μm (such as less than 55 μm, typically are less than 45 μm).In addition, in this specification sheets, the base material cladding thickness (thickness of each one side) of binder layer refers to the thickness from porous substrate surface to adhesive layer surface, in example as shown in Figure 1, refer to the thickness of the part of surperficial 10A, 10B of covering porous substrate 10 in binder layer 21,22, do not comprise the thickness of the part (inferior portion of each binder layer that symbol 214,224 represents) be infiltrated up in porous substrate.Base material cladding thickness, in other words, refers to the thickness of its upper section 212, the second binder layer 22 is referred to the thickness of its upper section 222 for the first binder layer 21.

The double-sided adhesive sheet of manufacture described above can meet characteristic (A): on the surface of the surface of the first binder layer and the second binder layer, paste a slice aluminium sheet respectively, 65 DEG C, keep 24 hours under the environment of 80%RH, then 23 DEG C, keep 2 hours under the environment of 50%RH, when then carrying out T-shaped stripping test with the speed of 100mm/ second, in the area of this double-sided adhesive sheet more than 50% (preferably more than 70%, more preferably more than 80%, further preferably more than 90%, most preferably 100%) peel off in the interface of binder layer and aluminium sheet.The releasable meeting the double-sided adhesive sheet of above-mentioned characteristic (A) is more excellent.Characteristic (A) can be measured by the method recorded in embodiment described later particularly.

In addition, the adhesive face (preferably the adhesive face of the first binder layer and the adhesive face both sides of the second binder layer) of preferred at least the first binder layer of above-mentioned double-sided adhesive sheet is more than 10N/20mm (such as more than 12N/20mm, typically is more than 14N/20mm, below 20N/20mm) (characteristic (B1)) to 180 ° of peel adhesion (to stainless steel bounding force) of stainless steel plate.In addition, more preferably the difference to stainless steel bounding force of the adhesive face of the first binder layer and the adhesive face of the second binder layer is (within such as 3N/20mm, within typically being 1N/20mm) within 5N/20mm.The double-sided adhesive sheet meeting above-mentioned characteristic can become the double-sided adhesive sheet of glueability and the releasable taken into account more to heavens stainless steel plate.In addition, above-mentioned bounding force can be measured by the method recorded in embodiment described later.

Above-mentioned double-sided adhesive sheet also preferably the adhesive face (preferably the adhesive face of the first binder layer and the adhesive face both sides of the second binder layer) of at least the first binder layer be more than 8N/20mm (such as more than 9N/20mm, typically is more than 10N/20mm, below 16N/20mm) (characteristic (B2)) to 180 ° of peel adhesion (to PP bounding force) of PP plate.In addition, more preferably the difference to PP bounding force of the adhesive face of the first binder layer and the adhesive face of the second binder layer is (within such as 3N/20mm, within typically being 1N/20mm) within 5N/20mm.The double-sided adhesive sheet meeting above-mentioned characteristic can become the double-sided adhesive sheet of glueability and the releasable taken into account more to heavens PP plate.In addition, above-mentioned bounding force can be measured by the method recorded in embodiment described later.

Above-mentioned double-sided adhesive sheet also preferably the adhesive face (preferably the adhesive face of the first binder layer and the adhesive face both sides of the second binder layer) of at least the first binder layer be more than 9N/20mm (such as more than 10N/20mm, typically is more than 12N/20mm, below 18N/20mm) (characteristic (B3)) to 180 ° of peel adhesion (to ABS bounding force) of ABS plate.In addition, more preferably the difference to ABS bounding force of the adhesive face of the first binder layer and the adhesive face of the second binder layer is (within such as 3N/20mm, within typically being 1N/20mm) within 5N/20mm.The double-sided adhesive sheet meeting above-mentioned characteristic can become the double-sided adhesive sheet of glueability and the releasable taken into account more to heavens ABS plate.In addition, above-mentioned bounding force can be measured by the method recorded in embodiment described later.

Above-mentioned double-sided adhesive sheet also preferably the adhesive face (preferably the adhesive face of the first binder layer and the adhesive face both sides of the second binder layer) of at least the first binder layer be more than 10N/20mm (such as more than 12N/20mm, typically is more than 14N/20mm, below 20N/20mm) (characteristic (B4)) to 180 ° of peel adhesion (to PC-ABS bounding force) of PC-ABS plate.In addition, more preferably the difference to PC-ABS bounding force of the adhesive face of the first binder layer and the adhesive face of the second binder layer is (within such as 3N/20mm, within typically being 1N/20mm) within 5N/20mm.The double-sided adhesive sheet meeting above-mentioned characteristic can become the double-sided adhesive sheet of glueability and the releasable taken into account more to heavens PC-ABS plate.In addition, above-mentioned bounding force can be measured by the method recorded in embodiment described later.

In addition, above-mentioned double-sided adhesive sheet is preferably by above-mentioned method (more specifically, the method recorded in embodiment described later) in the constant load stripping test carried out, for the adhesive face (preferably the adhesive face of the first binder layer and the adhesive face both sides of the second binder layer) of at least the first binder layer, peel distance for the stainless steel plate as adherend is below 10mm (such as below 5mm, typically is below 3mm) (characteristic (C1)).In addition, except using PP plate, ABS plate or PC-ABS plate as except adherend, in the constant load stripping test carried out respectively in the same manner as above-mentioned characteristic (C1), for the adhesive face (preferably the adhesive face of the first binder layer and the adhesive face both sides of the second binder layer) of at least the first binder layer, peel distance preferably for adherend is respectively below 10mm (such as below 5mm, typically is below 4mm) (characteristic (C2) (C3) (C4)).Meeting the double-sided adhesive sheet of above-mentioned characteristic, for various adherend, the double-sided adhesive sheet demonstrating high gluing reliability when being continuously applied load for a long time can being become.In addition, above-mentioned characteristic (C1) ~ (C4) all has the tendency of the impact of the smoothness being more easily subject to adhesive layer surface compared with other adhesion characteristic.Therefore, for the adhesive face of the first binder layer, the at least one met in above-mentioned characteristic (C1) ~ (C4) is (preferably two or more, more preferably more than three kinds, further preferably (C1) ~ (C4) is whole) adhesive face that can become secondary indication first binder layer has the index of excellent smoothness.

The thickness of double-sided adhesive sheet disclosed herein is preferably less than about 250 μm.Above-mentioned thickness, is described for Fig. 1, refers to porous substrate 10 and is arranged on aggregate thickness (thickness between the first adhesive face 21A and the second adhesive face 22A) H of binder layer 21,22 on its two sides.That is, the thickness of peelable supporter is not comprised at the thickness of this said double-sided adhesive sheet.The above-mentioned thickness of the double-sided adhesive sheet of an optimal way is less than 200 μm, is more preferably less than 150 μm (such as less than 130 μm).The double-sided adhesive sheet that thickness is so little can reduce the thickness (in other words, the distance by between the component surface of this both-sided adhesive chip bonding) at the junction surface using this double-sided adhesive sheet further, therefore preferably.Double-sided adhesive sheet disclosed herein, even thickness thin as mentioned above also can play excellent bond properties (such as high adhesion).

The thickness h of the porous substrate of double-sided adhesive sheet disclosed herein is preferably less than 50% relative to the ratio (h/H) of the thickness H of this double-sided adhesive sheet, is more preferably less than 45% (such as less than 43%).Meet the double-sided adhesive sheet of described Thickness Ratio (h/H), even the form of lightweight or slimming, as shown in Figure 1, also surperficial 10A, 10B of porous substrate 10 can be covered respectively by the tackiness agent 21,22 (in more detail, their upper section 212,222) of suitable thickness.Therefore, the double-sided adhesive sheet playing better adhesion characteristic (bounding force etc.) can be realized.From the viewpoint of taking into account bond properties and releasable more to heavens, above-mentioned Thickness Ratio (h/H) is set as that more than 25% is suitable, is preferably set to more than 30% (such as more than 35%).

Double-sided adhesive sheet disclosed herein can be tensile strength (MD tensile strength, T for flow direction in tensile strength _mD) and horizontal tensile strength (TD tensile strength, T _tD) be the double-sided adhesive sheet of more than 10.0N/10mm.Preferred T _mDand T _tDbe the double-sided adhesive sheet of more than 13.0N/10mm, more preferably more than 13.5N/10mm, further preferred more than 14.0N/10mm.The double-sided adhesive sheet showing described tensile strength can become the double-sided adhesive sheet of releasable more excellent (being particularly difficult to fragmentation occurs in stripping process).The upper limit of the tensile strength of double-sided adhesive sheet is not particularly limited, and considers cost, light-weighted easiness, usual T _mDand T _tDin at least one party be the double-sided adhesive sheet of below 20.0N/10mm be favourable.

The above-mentioned tensile strength T of above-mentioned double-sided adhesive sheet _tDrelative to T _mDratio (aspect ratio (T _tD/ T _mD)) preferably significantly do not depart from 1.Such as, preferably T can be adopted _tD/ T _mDsuch as, double-sided adhesive sheet in 0.8 ~ 1.2 (typically being 0.8 ~ 1.1,0.9 ~ 1.1) scope.The double-sided adhesive sheet that the directional dependence of such tensile strength is little, when peeling off from adherend, is not easy the difference producing the releasable caused by its direction of delaminate.Therefore, can more play consistently good releasable, can prevent the stripping of double-sided adhesive sheet from damaging better.

The tensile strength of double-sided adhesive sheet can measure as follows.That is, make the flow direction of the porous substrate of double-sided adhesive sheet (MD) consistent with length direction, this double-sided adhesive sheet is cut into the band shape of width 10mm, thus make test film.This test film is arranged to (chuck spacing 50mm) on tensile testing machine, according to JIS P8113, under the condition of draw speed 100mm/ minute, measures tensile strength (MD tensile strength) T along its length _mD(N/10mm).In addition, make the width of the porous substrate of double-sided adhesive sheet (TD) consistent with length direction, this double-sided adhesive sheet is cut into the band shape of width 10mm, thus makes test film, tensile strength (TD tensile strength) T in the width direction is similarly measured for this test film _tD(N/10mm).Additionally by T _tDdivided by T _mD(T _tD/ T _mD) aspect ratio of tensile strength calculated.Should use the same method in embodiment described later.

The releasable of double-sided adhesive sheet disclosed herein is excellent, is therefore suitable as in electrical article of being in, automobile, business automation equipment and other various industrial field parts (comprising the situation of carrying out situation about reclaiming and the constituent material that reclaims these parts with the form of these parts) the upper double-sided adhesive sheet pasted planning to reclaim.In addition, double-sided adhesive sheet disclosed herein can become the double-sided adhesive sheet having good bond properties concurrently, is therefore not limited to the parts reclaimed, also can be applicable to being applied to various field.

Below, some embodiments related to the present invention are described, but are not intended to limit the invention to the content shown in described embodiment.In addition, in the following description, except as otherwise noted, " part " and " % " is quality criteria.

< example 1>

(preparation of binder composition)

3 parts of vinylformic acid, 4 parts of vinyl-acetic esters, 93 parts of butyl acrylates, 0.1 part of Hydroxyethyl acrylate and 200 parts of toluene as polymer solvent are put in there-necked flask.While introducing nitrogen, stir 2 hours to remove the oxygen in polymerization system, then add 0.15 part 2,2 '-Diisopropyl azodicarboxylate (AIBN), is warmed up to 70 DEG C and carries out 6 hours polyreactions.Obtain polymers soln (toluene solution of acrylic polymers) like this.The weight-average molecular weight of resulting polymers is 70 × 10 ⁴.

In described polymers soln, 40 parts of tackifying resins (polymerized rosin that Huang Chuan chemical company manufactures is added relative to its solids component 100 parts, trade(brand)name " ペ Application セ Le D125 ") and 1.4 parts of isocyanates linking agents (Japanese polyurethane industrial manufactures, trade(brand)name " コ ロ ネ ー ト L ") and make final solids component be the toluene of the amount of 35%, and fully stir, thus prepare aqueous acrylic pressure-sensitive adhesive compositions.Viscosity at 23 DEG C of this acrylic pressure-sensitive adhesive compositions is 10Pas.The shearing loss Young's modulus G of the tackiness agent obtained by said composition " summit temperature be-25 DEG C.

(porous substrate)

As porous substrate, 100% of composition of preparation fiber is manila hemp fiber, basic weight is 14g/m ²and thickness is the non-woven fabrics A of 50 μm.MD tensile strength (the t of this non-woven fabrics A _mD) be 0.55kgf/15mm, TD tensile strength (t _tD) be 0.51kgf/15mm.In addition, MD tear strength (s _mD) be 400mN, TD tear strength (s _tD) be 440mN.

(making of double-sided adhesive sheet)

Preparation has the PE layer of thickness 25 μm in the single sided lamination without wood pulp paper and utilizes polysiloxane-based stripper to implement the sheet release liner of lift-off processing thereon.As shown in Figure 3, the release liner volume 80 obtained this release liner 31 is rolled into drum is arranged on double-sided adhesive sheet manufacturing installation 40, conveying release liner 31, uses comma coater 51, release liner 31 is coated with the binder composition 25 of above-mentioned preparation.And then the porous substrate 10 carried from rolls is fitted to from top on the membranaceous binder composition 25 release liner 31.As porous substrate 10, use above-mentioned non-woven fabrics A.Then, 100 DEG C of dryings 2 minutes, thus form first binder layer 21 with the base material cladding thickness of thickness about 35 μm at the first surface of porous substrate 10.Then, on the release liner of kind same as described above after coating adhesive composition, 100 DEG C of dryings 2 minutes, form binder layer thus.This binder layer is transferred to second of porous substrate 10, forms second binder layer (transfer printing) with the base material cladding thickness of thickness about 35 μm thus.The binder composition used in the formation of the second binder layer is identical with the binder composition used in the formation of the first binder layer.Such double-sided adhesive sheet having made example 1.Two adhesive faces of this double-sided adhesive sheet are protected by the release liner former state used in the making of this double-sided adhesive sheet.

In addition, the arithmetic mean surface roughness in the face of the above-mentioned binder composition of the applying of above-mentioned release liner is 0.25 μm.

< example 2>

Prepare the release liner of the same race with example 1, carry out drying after being coated with binder composition same as Example 1 thereon, form binder layer thus.Drying carries out 2 minutes at 100 DEG C.By being transferred on porous substrate by this binder layer, form first binder layer (transfer printing) with the base material cladding thickness of thickness about 35 μm at the first surface of porous substrate.As porous substrate, use above-mentioned non-woven fabrics A.Then, be there is in second formation of porous substrate by the transfer printing same with example 1 second binder layer of the base material cladding thickness of thickness about 35 μm.The binder composition used in the formation of the second binder layer is identical with the binder composition used in the formation of the first binder layer.Such double-sided adhesive sheet having made example 2.The release liner former state protection used during the making by this double-sided adhesive sheet of two adhesive faces of this double-sided adhesive sheet.

< example 3>

As porous substrate, use basic weight 17g/m ², thickness 45 μm the non-woven fabrics B comprising Manila hemp, the base material cladding thickness of the first binder layer and the second binder layer is set as about 37.5 μm respectively, in addition, has made the double-sided adhesive sheet of example 3 in the same manner as example 2.

< example 4>

The base material cladding thickness of the first binder layer and the second binder layer is set as 15 μm respectively, in addition, makes the double-sided adhesive sheet of example 4 in the same manner as example 2.

Double-sided adhesive sheet for each example carries out following evaluation test.The result of these evaluation tests is as shown in table 1.

[infiltration of binder layer]

When the degree that binder layer infiltrates in porous substrate is low, space in porous substrate (as the space in porous substrate and there is not the region of binder layer) increases, and has the tendency causing the transparency to decline due to the existence in this space.Based on this discovery, the transparency of the double-sided adhesive sheet of each example of visual valuation.Specifically, the release liner that will cover an adhesive face of double-sided adhesive sheet is peeled off, and the PET film pasting thickness 50 μm carries out lining.Adhesive sheet after this lining be cut into the square square of 100mm thus make test film.The release liner covering another adhesive face of this test film being peeled off, being crimped onto the surface of the white plastic plate being printed with black letters by making the roller of 2kg once come and go.Directly over above-mentioned plastic plate, visual observation is carried out to it, evaluate the transparent situation (transparency) of double-sided adhesive sheet.In evaluation, with the transparency of the double-sided adhesive sheet of example 2 for benchmark, carry out the direct contrast with the double-sided adhesive sheet of each example, when the double-sided adhesive sheet of transparent ratio 2 is excellent, be evaluated as zero.The transparency with the transparency of the double-sided adhesive sheet of example 2 equal or poorer than it time, be judged as ×.

[interlaminar failure test]

The double-sided adhesive sheet of each example is cut into the size of 15mm × 15mm, 23 DEG C, under the environment of 50%RH, the aluminium sheet (A1N30H-O that Zhu Qing aluminium foil company manufactures) of difference coating thickness 50 μm, width 20mm, length 100mm on the first binder layer and the second binder layer, thus make test film.By this test film 65 DEG C, preserve 24 hours under the environment of 80%RH after, then preserve 2 hours under the environment of temperature 23 DEG C, 50%RH, then hand-held the speed hand with about 100m/ second in the two ends of above-mentioned aluminium sheet carried out T-shaped stripping.After T-shaped stripping, visual observation adherend surface, judges releasable (interfacial failure degree) with following benchmark.

Zero: in the area of double-sided adhesive sheet, more than 50% peels off (releasable is excellent) in the interface of binder layer and aluminium sheet

×: in the area of double-sided adhesive sheet, the area peeled off in the interface of binder layer and aluminium sheet is less than 50% (releasable is bad)

Above-mentioned interlaminar failure is tested, is described in detail with reference to accompanying drawing.Namely, as shown in Figure 4, double-sided adhesive sheet 1 is cut into the size of 15mm × 15mm, the aluminium sheet 101,102 of difference coating thickness 50 μm, width 20mm, length 100mm on the adhesive face 21A of its first binder layer and the adhesive face 22A of the second binder layer, thus makes test film 110.Be fitted in 23 DEG C, carry out under the environment of 50%RH.By this test film 110 65 DEG C, preserve 24 hours under the environment of 80%RH after, then 23 DEG C, preserve 2 hours under the environment of 50%RH.Then, as shown in Figure 5,6, T-shaped stripping is carried out with the peeling rate of about 100mm/ second (typically be 100 ± 10mm/ second) in the two ends holding aluminium sheet 101,102.At this, Fig. 5 represents the form that double-sided adhesive sheet 1 is peeled off at the adhesive face 22A of the second binder layer and the interface of aluminium sheet 102, and Fig. 6 represents that the form of interlaminar failure occurs double-sided adhesive sheet 1.After so two panels aluminium sheet 101,102 being peeled off, the state of the double-sided adhesive sheet 1 that visual observation uses, and the ratio (interfacial failure degree) of area that the interface obtaining binder layer and aluminium sheet is peeled off.Such as, as shown in Figure 7, after above-mentioned T-shaped stripping, the aluminium sheet 102 pasted exists part 116 of the part 115 peeled off in the interface with the second binder layer and double-sided adhesive sheet generation interlaminar failure for second binder layer, calculate area ratio shared in the bonding area (15mm × 15mm) of part 115 at double-sided adhesive sheet 1 peeled off in interface, obtain interfacial failure degree thus.

[mensuration of bounding force]

The release liner that will cover an adhesive face of the double-sided adhesive sheet of each example is peeled off, and the PET film pasting thickness 25 μm carries out lining.Double-sided adhesive sheet after this lining is cut into width 20mm, length 100mm size thus make test film (make the length direction of test film consistent with the MD of porous substrate).The release liner that will cover another adhesive face of this test film is peeled off, 23 DEG C, by making the roller of 2kg once come and go, above-mentioned test film is crimped onto the surface of adherend under the environment of 50%RH.After gained object is placed 30 minutes at 23 DEG C, according to JIS Z0237,23 DEG C, use tensile testing machine to measure 180 ° of peel adhesion (N/20mm width) under the condition of draw speed 300mm/ minute under the mensuration environment of 50%RH.

For stainless steel (SUS304) plate, PP plate, ABS plate (Shin Kobe Electric Machinery Co., Ltd.'s manufacture) and PC-ABS plate four kinds of adherends, measure bounding force according to said process.

In addition, the mensuration of above-mentioned bounding force is carried out the adhesive face of the first binder layer, the adhesive face both sides of the second binder layer.The measurement result of the adhesive face for the first binder layer is listed in table 1.In addition, for the adhesive face of the second binder layer of each example bounding force respectively with the coming to the same thing of the adhesive face of the first binder layer for corresponding example.

[constant load stripping test]

As shown in Figure 8, a PET film 125 adhesive face 120A of the double-sided adhesive sheet 1 of each example being pasted thickness 25 μm carries out lining.Adhesive sheet 1 after this lining is cut into width 20mm, length 100mm size thus make test film 130.23 DEG C, under the environment of 50%RH, by making the roller of 2kg once come and go, another adhesive face 120B of test film 130 is crimped onto the surface of adherend 140.After gained object is placed 24 hours under same environment, in the ventricumbent mode being pasted with test film 130, adherend 140 is flatly kept.The load 145 applying 300g (2.94N) in one end of this test film 130 makes peel angle be 90 degree, and measures the peel distance after 1 hour.

For stainless steel (SUS304) plate, PP plate, ABS plate (Shin Kobe Electric Machinery Co., Ltd.'s manufacture) and PC-ABS tetra-kinds of adherends, carry out constant load stripping test according to said process.

In addition, the adhesive face both sides of above-mentioned test to the adhesive face of the first binder layer and the second binder layer carry out.The measurement result of the adhesive face for the first binder layer is listed in table 1.In addition, for the adhesive face of the second binder layer of each example measurement result respectively with the coming to the same thing of the adhesive face of the first adhesive face oxidant layer for corresponding example.

Table 1

As shown in table 1, the double-sided adhesive sheet of the transparent ratio 2 of the double-sided adhesive sheet of example 1 is excellent, therefore thinks that binder layer is infiltrated up in porous substrate fully.In addition, in interlaminar failure test, in the area of double-sided adhesive sheet, more than 50% peels off in the interface of binder layer and aluminium sheet.On the other hand, bond properties and the example 1 of the double-sided adhesive sheet of the example 2 of two sides employing transfer printing are equal, but the success ratio 1 of interlaminar failure test is poor.By these results, think that binder layer composition is carried out dry method by adopting by the double-sided adhesive sheet of example 1 after fitting to porous substrate, realize above-mentioned infiltration, compared with the double-sided adhesive sheet of example 2, the releasable that when peeling off from adherend after a procedure, display is more excellent.In addition, the double-sided adhesive sheet of example 1, to various adherend display high adhesion, is therefore thought and is taken into account glueability and releasable to heavens.In addition, the adhesive face of the first binder layer of example 1, being applied to formation after on level and smooth release liner, therefore can realize the surface smoothness no less than the adhesive layer surface formed by transfer printing.This point shows good result from the double-sided adhesive sheet of example 1 constant load stripping test and is also appreciated that.On the other hand, as can be seen from the result of example 3 obviously, improve the intensity of porous substrate self only by the basic weight increasing porous substrate, the interlaminar failure of double-sided adhesive sheet can not be avoided.In addition, be thinned in the example 4 of the base material cladding thickness of binder layer, the ratio of interlaminar failure can be reduced, but bounding force decline to a great extent, and there is the tendency of the peel distance increase in constant load stripping test.

Above, concrete example of the present invention has been described in detail, but these examples are only illustrate, and do not limit the scope of claim.Also comprise in the technology recorded in claims and above-mentioned illustrative concrete example carried out various distortion, change and the scheme obtained.

Claims (11)

1. a manufacture method for double-sided adhesive sheet, the first surface being included in the porous substrate of sheet forms the first binder layer, and forms the second binder layer at second of this porous substrate, wherein,

Described manufacture method comprises following operation:

Binder composition is applied to the applying step on peelable supporter,

After described applying step, make the contact operation that described binder composition contacts with described porous substrate,

By the binder composition after contacting with described porous substrate is dry and form the operation of described first binder layer;

The arithmetic mean surface roughness in the face of the described binder composition of applying of described peelable supporter is less than 1 μm.

2. manufacture method as claimed in claim 1, wherein,

Described double-sided adhesive sheet is formed in the mode meeting following characteristic:

(A) on the surface of the surface of described first binder layer and described second binder layer, a slice aluminium sheet is pasted respectively, keep 24 hours under the environment of temperature 65 DEG C, relative humidity 80%, then keep 2 hours under the environment of temperature 23 DEG C, relative humidity 50%, when then carrying out T-shaped stripping test with the speed of 100mm/ second, in the area of this double-sided adhesive sheet, more than 50% peels off in the interface of binder layer and aluminium sheet.

3. manufacture method as claimed in claim 1 or 2, wherein, in described contact operation, described porous substrate contacts from top with described binder composition.

4. the manufacture method according to any one of claims 1 to 3, wherein, carries out at the drying of the described binder composition temperature below 100 DEG C.

5. the manufacture method according to any one of Claims 1 to 4, wherein, described binder composition contains organic solvent as solvent.

6. the manufacture method according to any one of Claims 1 to 5, wherein, in described contact operation, the solid component concentration of described binder composition is 30 ~ 50 quality %.

7. the manufacture method according to any one of claim 1 ~ 6, wherein, in described contact operation, the viscosity of described binder composition at 23 DEG C is 1 ~ 50Pas.

8. the manufacture method according to any one of claim 1 ~ 7, wherein, described binder composition is acrylic pressure-sensitive adhesive compositions.

9. the manufacture method according to any one of claim 1 ~ 8, wherein, uses basic weight 10 ~ 30g/m ²non-woven fabrics as described porous substrate.

10. the manufacture method according to any one of claim 1 ~ 9, wherein, uses the non-woven fabrics of thickness 10 ~ 150 μm as described porous substrate.

11. manufacture method according to any one of claim 1 ~ 10, wherein, more than the 90 quality % of the formation fiber of described porous substrate are manila hemp fiber.