CN104817970A

CN104817970A - Two-sided pasting sheet

Info

Publication number: CN104817970A
Application number: CN201510050128.3A
Authority: CN
Inventors: 广西正人; 中山直树; 渡边茂树
Original assignee: Nitto Denko Corp
Current assignee: Nitto Denko Corp
Priority date: 2014-01-31
Filing date: 2015-01-30
Publication date: 2015-08-05
Also published as: JP2015163690A

Abstract

The invention provides a two-sided pasting sheet. The provided two-sided pasting sheet can achieve excellent repeeling performance and raised resistance to resilience. The two-sided pasting sheet comprises a base material and adhesive layers arranged at two sides of the base material. The based material shows a stress of 30-110N in a probe descending test (3mm).

Description

Double-sided adhesive sheet

Technical field

The present invention relates to the double-sided adhesive sheet being provided with binder layer on the two sides of base material.

Background technology

Generally speaking, tackiness agent (also referred to as pressure-sensitive adhesive, lower with) in the state of soft solid (viscoelastic body), has and utilizes pressure to be glued to character on adherend simply in the temperature range of near room temperature.Utilize such character, tackiness agent is provided with form widespread use in order to objects such as engaging, fix in various field of the band base material double-sided adhesive sheet of binder layer with the two sides such as at base material.Such as, use foam excellent as the impact absorbency, discrepancy in elevation tracing ability, resistance to rebound resilience etc. of the double-sided adhesive sheet of base material, be therefore preferred for the joint of the parts in portable electric appts.But, because the general rigidity of foam base material is less than non-foamed resin films such as polyethylene terephthalates (PET) and inside exists the reasons such as bubble, there is shortcoming in processibility, releasable, water-repellancy and other side.In order to avoid the shortcoming that so existing foam base material has, propose the technology (such as, see patent documentation 1 and 2) using non-foamed film as base material.

Prior art document

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2013-10867 publication

Patent documentation 2: Japanese Unexamined Patent Publication 2013-100465 publication

Summary of the invention

Invent problem to be solved

Present situation is, although above-mentioned use non-foamed film improves as the performance such as adhesive sheet releasable of base material, can not realize and resistance to rebound resilience equal when using foam base material.Such as, the adhesive sheet recorded in patent documentation 1 is by forming the shape of following adherend surface containing rubber resin layer generation recoverable deformation of base material.But because base material contains pet layer, the rigidity therefore as base material entirety is high.Therefore, likely can not follow this adherend surface fully according to the shape on adherend surface, resistance to rebound resilience declines.In addition, the annular resiliency test in patent documentation 2 is the measuring method that base material dependency degree is high, for the adhesive sheet possessing the base material with the above pliability of regulation, can not evaluate the resistance to rebound resilience of adhesive sheet rightly.Guaranteeing that excellent releasable improves resistance to elastic double-sided adhesive sheet simultaneously further if provided, will be useful.

The present invention makes in view of above-mentioned item, its object is to provide to realize excellent releasable, and the double-sided adhesive sheet that resistance to rebound resilience improves.

For the means of dealing with problems

According to the present invention, provide a kind of double-sided adhesive sheet, its binder layer on two sides that there is base material and be arranged on this base material.

The stress of described base material display 30N ~ 110N in following probe dropping test (3mm).

[probe dropping test (3mm)]

Prepare two length of a film 70mm, wide 60mm, the polycarbonate plate of thick 2 μm; At the self adhesive tape of the respective single-sided lamination double faced adhesive tape viscosity of these polycarbonate plates, and offer the hole of diameter 12mm at the center of the polycarbonate plate being fitted with this self adhesive tape; Then, clamp the determination object base material being cut into long 70mm, wide 60mm with the face being pasted with this self adhesive tape of described two panels polycarbonate plate, and use hand roller to fit, thus make working sample; This working sample level is loaded, the cylindrical probe of diameter 10mm to be inserted from top in a hole described two panels polycarbonate plate and with described determination object substrate contact; By described probe with the speed of 10mm/ minute decline 3mm from described contact, and measure stress now.

By being used in the base material of the stress of display specialized range in above-mentioned probe dropping test (3mm), intensity and the flexibility of double-sided adhesive sheet can being balanced with high level, realize excellent releasable, and improve resistance to rebound resilience.When the surface shape (can for curved surface, have the surface etc. of the discrepancy in elevation) that this said resistance to rebound resilience refers to along adherend makes above-mentioned double-sided adhesive sheet recoverable deformation, resist the performance (that is, tolerating the performance of the screen resilience of double-sided adhesive sheet) that this double-sided adhesive sheet wants to return to the screen resilience of original form and the shape after making this double-sided adhesive sheet keep above-mentioned recoverable deformation.The above-mentioned resistance to rebound resilience of double-sided adhesive sheet disclosed herein improves, and the tracing ability (discrepancy in elevation tracing ability) therefore surface to the adherend of the discrepancy in elevation is also excellent.

In an optimal way of technology disclosed herein, the elongation at break of described adhesive sheet display more than 400%.The adhesive sheet showing above-mentioned elongation at break has the tendency of the good flexibility of display, therefore easily realizes resistance to elastic raising.In addition, there is the tendency that releasable is also excellent.Particularly, there is the tendency that the performance (extraction releasable) peeled off in the mode of extracting out between two adherends improves.

In an optimal way of technology disclosed herein, described adhesive sheet display 10N/mm ²above tensile strength.The adhesive sheet showing above-mentioned tensile strength is not easy to tear when peeling off, and therefore releasable (such as, extracting releasable out) is excellent.In addition, there is the tendency that the processibility of punch press process etc. is also excellent.

In an optimal way of technology disclosed herein, 180 degree of stripping strengths of described adhesive sheet display more than 23N/20mm.The adhesive sheet and the adherend that show above-mentioned stripping strength are gluing well.

In an optimal way of technology disclosed herein, described binder layer is the acrylic adhesive layer containing acrylic polymers.By possessing the double-sided adhesive sheet of acrylic adhesive layer, can be applicable to realizing taking into account releasable and resistance to elastic formation with high level.

In an optimal way of technology disclosed herein, described base material is the resin film base material of non-foamed.By using the resin film of non-foamed as base material, excellent releasable can be realized.In addition, in technology disclosed herein, the formation possessing the resin film base material of non-foamed can realize resistance to elastic raising.Compared with using the formation of the resin film base material of non-foamed and using the formation of foam base material, the processibilities such as punch press process are more excellent, even and if also can guarantee excellent water-repellancy when double-sided adhesive sheet being formed as narrow width.

In an optimal way of technology disclosed herein, described base material is polyolefin resin film base material or polyester resin film base material.By using polyolefin resin film or polyester resin film as base material, can be applicable to realizing taking into account releasable and resistance to elastic formation with high level.

In an optimal way of technology disclosed herein, the thickness of described base material is 70 ~ 200 μm.Generally speaking, when the thickness of base material increases, the rigidity with base material also increases and the tendency of resistance to rebound resilience decline.According to technology disclosed herein, the formation possessing the base material with above-mentioned thickness can be applicable to realizing resistance to elastic raising.

Double-sided adhesive sheet disclosed herein can realize excellent releasable, the resistance to rebound resilience that display improves.In addition, even if also excellent processibility can be obtained when being formed as narrow width.In addition, excellent pressing adhesive power, shock-resistance, water-repellancy can be shown.Therefore, the double-sided adhesive sheet of the parts for engaging portable electric appts is suitable as.

Double-sided adhesive sheet disclosed herein with high-level balance strength and flexibility, can realize excellent releasable.Particularly, excellent intensity and elongation can be shown for stretching.Therefore, be applicable to using in the following manner: use it for and fix two adherends, and complete this fixing after, by described double-sided adhesive sheet is peeled off from extracting out between these two adherends from these two adherends.

Accompanying drawing explanation

Fig. 1 is the sectional view of the configuration example schematically showing adhesive sheet.

Fig. 2 is the sectional view of another configuration example schematically showing adhesive sheet.

Fig. 3 is the explanatory view schematically showing the mode that extraction is peeled off again.

Fig. 4 is the explanatory view of the evaluation method representing probe dropping test.

Fig. 5 is the explanatory view representing the sample for evaluation used when measuring pressing adhesive power.

Fig. 6 is the explanatory view of the measuring method representing pressing adhesive power.

The explanatory view of the sample for evaluation that Fig. 7 uses when being and representing and evaluate shock-resistance.

The explanatory view of the sample for evaluation that Fig. 8 uses when being and representing and evaluate water-repellancy.

Fig. 9 represents the schematic diagram being pasted onto the original state of the test film on adherend in resistance to rebound resilience evaluation.

Figure 10 is the schematic diagram representing the state that the end being pasted onto the test film on adherend in resistance to rebound resilience evaluation tilts from this adherend.

Reference numeral

1,2 double-sided adhesive sheets

10 base materials

21,22 binder layers

31,32 release liners

Embodiment

Below, the preferred embodiment of the present invention is described.In addition, the design item that the necessary item of enforcement of the present invention be can be understood as to 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.

In addition, in following accompanying drawing, sometimes realize the component of phase same-action, position gives identical symbol and be described, sometimes omit or simplify the explanation repeated.In addition, the embodiment recorded in accompanying drawing carry out signalization to clearly the present invention is described, the earth's surface that is inaccurate is shown as size or the reduced scale of the adhesive sheet of the present invention provided for goods are actual.

In this manual, " tackiness agent " refers to the state of the solid (viscoelastic body) being softness as previously mentioned in the temperature range of near room temperature, has the material of the character utilizing pressure gluing with adherend simply.At this said tackiness agent, as " C. A. Dahlquist; " Adhesion:Fundamental and Practice "; McLaren & Sons; (1966); P.143 " define, generally speaking has satisfied plural modulus in tension E* (1Hz) <10 ⁷dyne/cm ²the material (typically, being the material at 25 DEG C with above-mentioned character) of character.

The formation > of < adhesive sheet

Adhesive sheet disclosed herein typically is the band base material adhesive sheet on the two sides of base material (supporter) with the form of binder layer.The article being called self adhesive tape, adhesive label, adhesive film etc. can be comprised in the concept of this said adhesive sheet.In addition, adhesive sheet disclosed herein can be drum, also can be flake.Or, can for being processed as the adhesive sheet of the form of different shape further.

The cross section structure that adhesive sheet disclosed herein can have such as Fig. 1, represent to property illustrated in Figure 2.Adhesive sheet 1 shown in Fig. 1 has following formation: be respectively arranged with binder layer 21,22 each (being non-peel-away) of base material 10, and the release liner 31,32 that these binder layers 21,22 are release surface by least this binder layer side is respectively protected.Adhesive sheet 2 shown in Fig. 2 has following formation: be respectively arranged with binder layer 21,22 each (being non-peel-away) of base material 10, and a binder layer 21 in these binder layers is protected by the two-sided release liner 31 for release surface.For this adhesive sheet 2, make the rear-face contact of another binder layer 22 and release liner 31 by being reeled by this adhesive sheet 2, what can become that binder layer 22 also protected by release liner 31 is formed.

< base material >

The feature of base material disclosed herein is the stress (hereinafter also referred to " 3mm decline stress ") of display 30 ~ 110N in above-mentioned probe dropping test (3mm).Above-mentioned probe dropping test is be applicable to evaluating the test that the above flexibility (such as tracing ability, elongation) of display regulation has the base material of the intensity being not easy to tear simultaneously.By using the base material of the stress of display 30 ~ 110N in above-mentioned probe dropping test (3mm), intensity and the flexibility of double-sided adhesive sheet can be balanced with high level, play excellent releasable, and improve resistance to rebound resilience.Above-mentioned 3mm decline stress is preferably more than 32N (such as more than 35N) from the viewpoint of releasable, can be more than 45N (such as more than 50N, typically is more than 60N).In addition, consider from viewpoints such as resistance to rebound resilience, discrepancy in elevation tracing ability, releasables (such as extracting releasable out), above-mentioned 3mm decline stress is preferably below 80N (such as below 75N typically is below 70N).When more paying attention to resistance to rebound resilience, discrepancy in elevation tracing ability, above-mentioned 3mm decline stress is more preferably below 60N (such as below 50N, typically is below 40N).Probe dropping test (3mm) more specifically can be undertaken by the method recorded in embodiment described later.

Base material disclosed herein does not preferably rupture in probe dropping test (10mm).Thus, can be applicable to realizing improving resistance to elastic formation.In addition, by using the base material of the above-mentioned characteristic of display, the workability during stripping of double-sided adhesive sheet improves, and releasable improves further.Stress (hereinafter also referred to " 10mm decline stress ") in above-mentioned probe dropping test (10mm) is more preferably more than 45N (such as more than 50N) from the viewpoint of releasable, can be more than 60N (such as more than 70N, typically is more than 90N).In addition, consider from viewpoints such as resistance to rebound resilience, discrepancy in elevation tracing ability, releasables (such as extracting releasable out), above-mentioned 10mm decline stress is below 380N is suitable, is preferably below 150N (such as below 120N, typically is below 105N).When more paying attention to resistance to rebound resilience, discrepancy in elevation tracing ability, above-mentioned stress is more preferably below 90N (such as below 80N, typically is below 60N).Probe dropping test (10mm) is by carrying out except the method that probe is same with probe dropping test (3mm) except decline 10mm with determination object substrate contact.More specifically, the method by recording in embodiment described later is carried out.

In addition, base material disclosed herein does not preferably rupture in probe dropping test (5mm).Thus, can be applicable to realizing improving resistance to elastic formation.In addition, by using the base material of the above-mentioned characteristic of display, the workability during stripping of double-sided adhesive sheet improves, and releasable improves further.Stress (hereinafter also referred to " 5mm decline stress ") in above-mentioned probe dropping test (5mm) is more preferably more than 35N (such as more than 40N) from the viewpoint of releasable, can be more than 50N (such as more than 60N, typically is more than 70N).In addition, consider from viewpoints such as resistance to rebound resilience, discrepancy in elevation tracing ability, releasables (such as extracting releasable out), above-mentioned 5mm decline stress is below 380N is suitable, is preferably below 150N (such as below 100N, typically is below 80N).When more paying attention to resistance to rebound resilience, discrepancy in elevation tracing ability, above-mentioned stress is more preferably below 70N (such as below 60N, typically is below 50N).Probe dropping test (5mm) is by carrying out except the method that probe is same with probe dropping test (3mm) except decline 5mm with determination object substrate contact.More specifically, the method by recording in embodiment described later is carried out.

Base material disclosed herein preferably shows the elongation at break of more than 200%.By using the base material of the above-mentioned elongation at break of display, the elongation as adhesive sheet entirety is adjusted in preferred scope, and the tendency showing good flexibility increases.In addition, there is the tendency that releasable (particularly extracting releasable out) is also excellent.Wherein, the base material of the elongation at break of display more than 300% (such as more than 400%, typically be more than 500%) is more preferably used.The upper limit of above-mentioned elongation at break is not particularly limited, and considers releasable etc., can be such as about less than 700% (typically being about less than 600%).Base material disclosed herein can show the base material of above-mentioned elongation at break at least one party (preferred both sides) in MD (longitudinal direction) direction and CD (transverse direction) direction.The elongation at break of base material is measured by the method recorded in embodiment described later.

Base material disclosed herein preferably shows 15N/mm ²above tensile strength.By using the base material of the above-mentioned tensile strength of display, adhesive sheet is not easy to tear when peeling off, and releasable (such as extracting releasable out) is excellent.In addition, there is the tendency that the processibility of punch press process etc. is also excellent.Wherein, display 20N/mm is more preferably used ²(such as 25N/mm above ²above, 30N/mm typically is ²the base material of tensile strength above).When above-mentioned tensile strength is too high, the flexibility with base material declines, and be difficult to obtain good resistance to elastic tendency, therefore above-mentioned tensile strength is more preferably about 100N/mm ²(such as about 70N/mm below ²below, about 50N/mm typically is ²below).Base material disclosed herein can show the base material of above-mentioned tensile strength at least one party (preferred both sides) in MD direction and CD direction.The tensile strength of base material is measured by the method recorded in embodiment described later.

In adhesive sheet disclosed herein, as the base material (support base material) supporting (lining) binder layer, various film like base material can be used.Then be not particularly limited as long as base material meets above-mentioned 3mm decline stress.As above-mentioned base material, such as resin film, rubber-like film, foam film, tinsel, their mixture etc. preferably can be used.Wherein, the base material preferably containing resin film, the base material be preferably made up of resin film in fact further.In addition, in this manual, " resin film " typically is the resin film of non-foamed in fact.In other words, bubble (tight) can be there is not in fact in this resin film.Therefore, be the concept different from so-called foam film.In addition, above-mentioned resin film typically is film non-porous in fact, is and so-called non-woven fabrics or different concept of weaving cotton cloth.In addition, above-mentioned resin film can be understood as the concept different from so-called rubber-like film from the viewpoint of mechanical characteristics (such as rigidity etc.).

Generally speaking the resin film that can be used as base material has the more excellent tendency of the physical strengths such as tensile strength compared with foam, in addition, there is not in fact the bubble (space) that may become weakness for stress, be not easy to tear when therefore peeling off, releasable is excellent.In addition, resin film base material water-repellancy compared with foam base material is more excellent.Such as, in the components bonding purposes of portable electric appts, use foam base material as the base material of adhesive sheet.In this purposes, in recent years along with the extension of the miniaturization of portable electric appts, image display area shared in this Whole Equipment, the requirement for the adhesive sheet of narrower width increases.But sometimes comprise thick bubble in foam base material, when by adhesive sheet narrowed width, the thick bubble likely in base material runs through adhesive sheet width, thus cause the water-proof function of portable electric appts inside impaired due to this adhesive sheet.Can eliminate as base material by using the resin film of non-foamed the worry of this water-repellancy.The processibility (such as punch press process) of resin film is also excellent.Therefore, use resin film as the adhesive sheet of base material, in the formation that width narrows further, be also favourable in processibility, dimensional precision.The aspects such as this external dimensional stability of resin film, thickness and precision, economy (cost) are also excellent.

As the preference of the resin material of formation resin film disclosed herein, polyolefin resin, polyester resin etc. can be enumerated.At this, polyolefin resin refers to contain polyolefinic resin more than the ratio of 50 % by weight.Similarly, polyester resin refers to the resin containing polyester more than the ratio of 50 % by weight.As polyolefin resin film, can enumerate: polyethylene (PE) resinoid, polypropylene (PP) resinoid, ethylene-propylene copolymer, ethylene-butene copolymer etc.As polyester resin, can enumerate: polyethylene terephthalate (PET) resinoid, polybutylene terephthalate (PBT) resinoid, PEN resinoid, PBN resinoid etc.Wherein, from the viewpoint of thermotolerance, anchoring (particularly the anchoring of acrylic adhesive layer), preferred polyester resinoid, from taking into account releasable and resistance to elastic viewpoint consideration, more preferably PBT resinoid.These resins can be used alone one or combinationally use two or more.In addition, these resin materials typically are soft resin material, such as, can be called flexible polyolefins resinoid, flexible polyester resinoid.

When the resin film of use containing polyester resin is as base material, as the polyester resin forming this base material, typically use containing the polyester resin of the polyester by di-carboxylic acid and dibasic alcohol polycondensation are obtained as main component.

As the di-carboxylic acid forming above-mentioned polyester, can enumerate such as: phthalic acid, m-phthalic acid, terephthalic acid, 5-sulfoisophthalic acid, 4,4 '-biphenyl dicarboxylic acid, 4,4 '-oxydibenzoic acid, 4,4 '-benzophenone dicarboxylic acid, 4,4 '-biphenoxyl ethane dioctyl phthalate, 4, the aromatic binary carboxylic acid such as 4 '-diphenylsulfone dicarboxylic acid, NDA; The ester ring type di-carboxylic acid such as 1,2-cyclohexane cyclohexanedimethanodibasic, 1,3-cyclohexane cyclohexanedimethanodibasic, 1,4 cyclohexanedicarboxylic acid; The aliphatic dicarboxylic acids such as propanedioic acid, succinic acid, pentanedioic acid, hexanodioic acid, pimelic acid, suberic acid, nonane diacid, sebacic acid, dodecanedioic acid; The unsaturated dicarboxylic acids such as toxilic acid, maleic anhydride, fumaric acid; Their derivative (lower alkyl esters etc. of above-mentioned di-carboxylic acid such as such as terephthalic acid etc.); Deng.These materials can be used alone one or combinationally use two or more.Wherein, consider from viewpoints such as thermotolerances, optimization aromatic di-carboxylic acid, more preferably terephthalic acid.The ratio formed in the di-carboxylic acid of above-mentioned polyester shared by terephthalic acid is preferably more than 50 % by weight (such as more than 80 % by weight, typically be more than 95 % by weight), what also in fact only can be made up of terephthalic acid for above-mentioned di-carboxylic acid is formed.

As the dibasic alcohol forming above-mentioned polyester, can enumerate such as: ethylene glycol, Diethylene Glycol, polyoxyethylene glycol, propylene glycol, polypropylene glycol, 1, ammediol, 1,5-pentanediol, neopentyl glycol, 1,4-butyleneglycol, 1, the aliphatic dihydroxy alcohols such as 6-hexylene glycol, 1,8-ethohexadiol, polyoxytetramethylene glycol; The ester ring type dibasic alcohol such as 1,2-cyclohexane diol, Isosorbide-5-Nitrae-cyclohexane diol, 1,1-cyclohexanedimethanol, 1,4 cyclohexane dimethanol; Xylyl alcohol, 4,4 '-dihydroxybiphenyl, 2,2-two aromatic diols such as (4 '-hydroxy phenyl) propane, two (4-hydroxy phenyl) sulfone; Deng.These materials can be used alone one or combinationally use two or more.Wherein, from the physical property desired by applicable realization (such as, probe decline stress, elongation at break, tensile strength etc.) viewpoint consider, preferred aliphat dibasic alcohol, more preferably BDO, 1,6-hexylene glycol, 1,8-ethohexadiol, polyoxytetramethylene glycol, particularly preferably BDO, polyoxytetramethylene glycol.Form aliphatic dihydroxy alcohol in the dibasic alcohol of above-mentioned polyester (preferably 1,4-butyleneglycol and/or polyoxytetramethylene glycol) shared by ratio be preferably more than 50 % by weight (such as more than 80 % by weight, typically be more than 95 % by weight), above-mentioned dibasic alcohol can be in fact only made up of aliphatic dihydroxy alcohol (BDO and/or polyoxytetramethylene glycol).

From the viewpoint of the flexibility, the elongation that improve base material, above-mentioned polyester also can contain soft chain segment.Above-mentioned soft chain segment typically preferably has polyether structure.By introducing the compound with polyether structure in the polyester, deriving from the above-mentioned position with the compound of polyether structure in above-mentioned polyester and working as soft chain segment.As the above-mentioned compound with polyether structure, can enumerate as long chain diols such as the illustrative polyoxytetramethylene glycol of above-mentioned dibasic alcohol as preference.Long chain diol can be polyoxyethylene glycol, polypropylene glycol.By making the long chain diols such as polyoxytetramethylene glycol as dibasic alcohol and di-carboxylic acid polycondensation, suitably soft chain segment can be introduced in the polyester.

As long as the ratio of soft chain segment is suitably determined, to take into account releasable and resistance to rebound resilience, to be not particularly limited in above-mentioned polyester.Consider from viewpoints such as resistance to rebound resilience, discrepancy in elevation tracing abilities, in above-mentioned polyester, the ratio of soft chain segment is preferably more than 10 % by weight (such as more than 20 % by weight, typically be more than 25 % by weight).In addition, from the viewpoint of the rigidity guaranteeing releasable, regulation, aforementioned proportion is preferably less than 60 % by weight (such as less than 50 % by weight, typically be less than 40 % by weight).In addition, the ratio of soft chain segment is roughly consistent with the mixing ratio for the formation of the soft chain segment constituent (typically being the compound containing polyether structure) in the monomer composition of polyester.

In above-mentioned polyester except di-carboxylic acid, dibasic alcohol, other copolymer composition can be introduced.As other copolymer composition, can use: hydroxycarboxylic acid or the alkoxyl group carboxylic acids such as oxyacetic acid, m-Salicylic acid, P-hydroxybenzoic acid, 6-Hydroxy-2-naphthoic acid, p-beta-hydroxy ethoxybenzoic acid; The monocarboxylic acid or derivatives thereofs such as stearyl alcohol, benzylalcohol, stearic acid, phenylformic acid, p t butylbenzoic acid, benzoyl phenylformic acid; Polycarboxylic acids more than the third three trifunctionals such as acid, trimellitic acid, trimesic acid, pyromellitic acid, gallic acid, trimethylolethane, TriMethylolPropane(TMP), glycerine, tetramethylolmethane or polyvalent alcohol, their derivative; Deng in one or more.The ratio of these other copolymer compositions be in polyester to be less than for about 30 % by weight (are such as less than about 10 % by weight, typically are and are less than about 5 % by weight) be suitable.Technology disclosed herein can preferably be implemented as the mode of the polyester resin film base material of main component using the polyester not containing other copolymer composition to possess.

Polyester resin disclosed herein can make by suitably adopting existing known method.Such as, polyester resin can be obtained typically via above-mentioned di-carboxylic acid and above-mentioned dibasic alcohol and other copolymer composition are as required supplied to usual polycondensation.Polyester resin can also for the blend of two or more polyester such as obtained by above-mentioned polycondensation.In addition, in the scope of characteristic not damaging polyester, one or more of other resinous principles such as polyolefine, polyvinyl chloride, polyvinylidene dichloride, polyvinyl acetate, polystyrene, polyacetal, polyimide, polymeric amide, fluorine resin can be mixed with.Ratio in polyester resin shared by other resinous principle, is generally and was less than for about 30 % by weight (are such as less than about 10 % by weight, typically are and are less than about 5 % by weight).The mode that technology disclosed herein can be preferably in fact only made up of vibrin with the resinous principle of polyester resin film base material is implemented.

Base material in technology disclosed herein, in order to make to possess this base material double-sided adhesive sheet performance desired by appearance design, optical characteristics (such as opacifying property, light reflective etc.), black, white (such as oyster white) or other color can be colored as.This is painted can use the known organic or inorganic colourants (pigment, dyestuff etc.) such as the white color agents such as black colorant, titanium oxide such as carbon black.Tinting material can be used alone one or combinationally uses two or more.The use level of tinting material is not particularly limited, such as, for being less than for about 20 % by weight (are such as less than about 10 % by weight, typically are and are less than about 5 % by weight).Or, can be undertaken painted by implementing known printing treatment at substrate surface.

The various additives such as weighting agent (inorganic filler, organic filler etc.), antiaging agent, antioxidant, UV light absorber, antistatic agent, lubricant, softening agent can be coordinated as required in base material (such as resin film base material).The mixing ratio of various additive is generally and was less than for about 30 % by weight (are such as less than about 20 % by weight, typically are and are less than about 10 % by weight).

The existing known surface treatments such as Corona discharge Treatment, Cement Composite Treated by Plasma, uviolizing process, acid treatment, alkaline purification, coating silane coupling agent can be implemented in the surface of above-mentioned base material.Such surface treatment can be for improving adhesivity, the in other words binder layer of base material and binder layer to the process of the anchoring of base material.

Base material can be single layer structure, also can be two-layer, three layers or its above multilayered structure.When multilayered structure, preferably at least one deck (preferably all layer) for having the layer of the continuous structure of above-mentioned resin (more preferably polyolefin resin or polyester resin).As long as the manufacture method of base material suitably adopts existing known method, be not particularly limited.When adopting resin film base material as base material, suitably can adopt the existing known general film forming processes such as such as extrusion molding, blow molding, T-shaped die head tape casting, calendaring molding.

The density of the base material (preferred resin film substrate) used in technology disclosed herein is not particularly limited.Such as, consider from viewpoints such as raising intensity, preferably use and there is about 0.85g/cm ³(preferably about 0.94g/cm above ³above, about 1.00g/cm typically is ³above, such as about 1.10g/cm ³the base material of density above).In addition, consider from viewpoints such as flexibilities, the upper limit of above-mentioned density is preferably about 1.50g/cm ³(such as about 1.30g/cm below ³below, about 1.20g/cm typically is ³below).In addition, in this manual, the density of base material can measure according to JISK7112:1999 or ASTM D792.

The thickness of base material is not particularly limited, and suitably can select according to object, and it is suitable for being generally more than about 50 μm (such as more than about 70 μm, typically are more than about 75 μm).The base material with above-mentioned thickness can become the excellent base material of releasable.In addition, base material disclosed herein, the formation with above-mentioned thickness can show the 3mm decline stress of regulation, and therefore double-sided adhesive sheet can realize excellent resistance to rebound resilience.In addition, by base material, there is the above thickness of regulation, the increase of the thickness of binder layer in the purposes requiring thick double-sided adhesive sheet can be suppressed, good drying efficiency and then good productivity can be guaranteed.Consider from resistance to elastic viewpoint, the thickness of base material is preferably less than 500 μm, is more preferably less than 200 μm (such as less than 150 μm, typically are less than 120 μm).Also be favourable by the lower thickness of base material from the viewpoint of the filming, miniaturization, lightweight, economizing on resources etc. of double-sided adhesive sheet.

< binder layer >

Binder layer (comprising the layer of tackiness agent) in technology disclosed herein can for the binder layer formed by aqueous adhesive composition, Solvent Adhesive composition, hot-melt adhesive composition, active energy ray curable binder 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, typically comprises the binder composition being called water-dispersed pressure-sensitive adhesive composition (composition of the form be dispersed in water at least partially of tackiness agent) etc.In addition, Solvent Adhesive composition refers to the binder composition of the form comprising tackiness agent in organic solvent.Technology disclosed herein, from the viewpoint of being applicable to realizing the characteristics such as adhesion characteristic, can preferably implement in the mode possessing the binder layer formed by Solvent Adhesive composition.

Binder layer disclosed herein can containing the various rubbery polymers such as known acrylic polymers, rubber polymer, polyester polymer, polyurethane polymer, polyether-based polymers, polysiloxane type polymers, polyamide polymers, fluoropolymer in adhesive field one or more based on polymkeric substance.Consider from the viewpoint such as adhesion characteristic, cost, preferably can adopt acrylic polymers.

In addition, " base polymer " of tackiness agent refers to the main component of rubbery polymer contained in this tackiness agent.Above-mentioned rubbery polymer refers to the polymkeric substance showing caoutchouc elasticity in the temperature range of near room temperature.In addition, in this manual, " main component " refers to the composition of content more than 50 % by weight in case of no particular description.

In addition, " acrylic polymers " refers to the polymkeric substance of monomeric unit as the monomeric unit of this polymkeric substance of formation containing deriving from a part the monomer with at least one (methyl) acryl.Below, the monomer in a part with at least one (methyl) acryl is called " acrylic monomer ".Acrylic polymers in this specification sheets is defined as the polymkeric substance containing the monomeric unit deriving from acrylic monomer.As the typical case of acrylic polymers, the acrylic polymers of ratio more than 50 % by weight of acrylic monomer in the monomer composition of this acrylic polymers can be enumerated.

In addition, " (methyl) acryl " is the implication briefly representing acryl and methacryloyl.Similarly, " (methyl) acrylate " is the implication briefly representing acrylate and methacrylic ester, and " (methyl) vinylformic acid " is the implication briefly representing vinylformic acid and methacrylic acid.

As aforesaid propylene acids polymers, preference as containing (methyl) alkyl acrylate as principal monomer and can also containing the polymkeric substance of raw material monomer with this principal monomer with the secondary monomer of copolymerizable.At this, principal monomer refer to account for exceed in above-mentioned raw material monomer monomer composition 50 % by weight composition.

As (methyl) alkyl acrylate, the compound that such as following formula (1) represents preferably can be used.

CH ₂＝C(R ¹)COOR ²(1)

At this, the R in above-mentioned formula (1) ¹for hydrogen atom or methyl.In addition, R ²for such carbon atom number range (below, is denoted as C by the chain-like alkyl of carbonatoms 1 ~ 20 sometimes _1-20).Consider from viewpoints such as the store elastic modulus of tackiness agent, preferred R ²for C _1-14(such as C _2-10, typically be C _4-8) (methyl) alkyl acrylate of chain-like alkyl, from the viewpoint of adhesion characteristics such as resistance to rebound resilience, adhesive powers, more preferably R ¹for hydrogen atom and R ²for C _4-8(such as C _4-7, typically be C ₄) the alkyl acrylate of chain-like alkyl (below sometimes referred to as vinylformic acid C _4-8alkyl ester).

As R ²for C _1-20(methyl) alkyl acrylate of chain-like alkyl, can enumerate such as: (methyl) methyl acrylate, (methyl) ethyl propenoate, (methyl) propyl acrylate, (methyl) isopropyl acrylate, (methyl) n-butyl acrylate, (methyl) isobutyl acrylate, (methyl) sec-butyl acrylate, (methyl) amyl acrylate, (methyl) isoamyl acrylate, (methyl) Ethyl acrylate, (methyl) heptylacrylate, (methyl) 2-EHA, (methyl) Octyl acrylate, (methyl) Isooctyl acrylate monomer, (methyl) vinylformic acid ester in the ninth of the ten Heavenly Stems, (methyl) vinylformic acid ester in the different ninth of the ten Heavenly Stems, (methyl) decyl acrylate, (methyl) isodecyl acrylate, (methyl) vinylformic acid undecyl ester, (methyl) dodecylacrylate, (methyl) tridecyl acrylate, (methyl) vinylformic acid tetradecyl ester, (methyl) vinylformic acid pentadecyl ester, (methyl) aliphatic acrylate, (methyl) vinylformic acid heptadecyl ester, (methyl) octadecyl acrylate, (methyl) vinylformic acid nonadecyl ester, (methyl) vinylformic acid eicosyl ester etc.These (methyl) alkyl acrylates can be used alone one or combinationally use two or more.As preferred (methyl) alkyl acrylate, n-butyl acrylate (BA) and 2-EHA (2EHA) can be enumerated.Wherein, from the viewpoint of adhesion characteristics such as resistance to rebound resilience, adhesive powers, particularly preferably BA.

In whole monomer component, the mixing ratio of principal monomer is preferably more than 70 % by weight, is more preferably more than 85 % by weight, and more preferably more than 90 % by weight.The upper limit of the mixing ratio of principal monomer is not particularly limited, and is preferably less than 99.5 % by weight (such as less than 99 % by weight).Or acrylic polymers can for the polymkeric substance in fact only principal monomer polymerization obtained.In addition, containing vinylformic acid C _4-8when alkyl ester is as principal monomer, this vinylformic acid C _4-8the mixing ratio of alkyl ester in principal monomer is preferably more than 70 % by weight, is more preferably more than 90 % by weight, more preferably more than 95 % by weight (typically being 99 ~ 100 % by weight).Technology disclosed herein can preferably be implemented for the mode of BA with more than 50 % by weight (such as more than 70 % by weight, typically be more than 90 % by weight) of the monomer of above-mentioned raw material monomer composition.

Be not particularly limited, as the acrylic polymers in technology disclosed herein, can preferably use 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, (methyl) 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 above-mentioned 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.

Such hydroxy acryl acid class monomer preferably uses in the scope of less than about 10 % by weight in for the synthesis of the monomer total amount of acrylic polymers more than about 0.001 % by weight.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 more than about 0.01 % by weight and less than about 5 % by weight (such as more than about 0.05 % by weight and less than about 2 % by weight), better result can be reached.Or the acrylic polymers in technology disclosed herein can be the polymkeric substance that non-copolymerization has hydroxy acryl acid class monomer.

In the scope of not obvious infringement effect of the present invention, in the acrylic polymers in technology disclosed herein, copolymerization can there is monomer other than the above (other monomer).Other monomer above-mentioned can in order to such as regulate the second-order transition temperature of acrylic polymers, regulate the objects such as bond properties (such as separability) and use.Such as, as the cohesive force of tackiness agent, the monomer of thermotolerance can be improved, can enumerate containing sulfonic group monomer, phosphorous acid-based monomers, cyano-containing monomer, vinyl ester, aromatic ethenyl compound etc.Wherein, vinyl ester can be enumerated as preference.As vinyl ester, vinyl-acetic ester (VAc), propionate, vinyl laurate etc. can be illustrated particularly.Wherein, preferred VAc.

In addition, or can be able to contribute to improving other 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.Such as, preferred copolymerization has carboxyl group-containing monomer as the acrylic polymers of other monomer above-mentioned.As carboxyl group-containing monomer, can exemplary propylene acid (AA), methacrylic acid (MAA), (methyl) carboxyethyl acrylates, (methyl) vinylformic acid carboxyl pentyl ester, methylene-succinic acid, toxilic acid, fumaric acid, β-crotonic acid, iso-crotonic acid etc.Wherein, preferred AA, MAA.

Above-mentioned " other monomer " can be used alone one, also can combinationally use two or more, content as a whole, less than about 40 % by weight (typically being about 0.001 % by weight ~ about 40 % by weight) are preferably in for the synthesis of the monomer total amount of acrylic polymers, be more preferably less than about 30 % by weight (typically being about 0.01 % by weight ~ about 30 % by weight, such as about 0.1 % by weight ~ about 10 % by weight).When using carboxyl group-containing monomer as other monomer above-mentioned, its content is about 0.1 % by weight ~ about 10 % by weight (such as about 0.2 % by weight ~ about 8 % by weight, typically be about 0.5 % by weight ~ about 5 % by weight) in above-mentioned monomer total amount is suitable.In addition, when using vinyl esters (such as vinyl-acetic ester) as other monomer above-mentioned, its content is such as about 0.1 % by weight ~ about 20 % by weight (typically being about 0.5 % by weight ~ about 10 % by weight) in above-mentioned monomer total amount is suitable.

The copolymerization composition of design aforesaid propylene acids polymers makes the second-order transition temperature (Tg) of this polymkeric substance be suitable for less than-15 DEG C (typically being more than-70 DEG C and less than-15 DEG C), be preferably less than-25 DEG C (such as more than-60 DEG C and less than-25 DEG C), be more preferably less than-40 DEG C (such as more than-60 DEG C and less than-40 DEG C).The Tg of acrylic polymers is adjusted to below above-mentioned higher limit and considers it is preferred from viewpoints such as the shock-resistance of double-sided adhesive sheet.

The Tg of acrylic polymers can be regulated by appropriate change monomer composition (that is, for the synthesis of kind, the usage quantity ratio of the monomer of this polymkeric substance).At this, the Tg of acrylic polymers is the value obtained by Fox formula based on the Tg of homopolymer (homopolymer) and the weight fraction (copolymerization ratios of weight basis) of this monomer of each monomer forming this polymkeric substance.As the Tg of homopolymer, the value recorded in known data can be adopted.

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

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

When also not recording in Polymer Handbook (the 3rd edition, John Wiley & Sons, Inc, 1989), use the value obtained by following measuring method.

Specifically, in the reactor with thermometer, agitator, nitrogen introducing tube and reflux condensing tube, drop into 100 weight parts monomers, 0.2 weight part Diisopropyl azodicarboxylate and 200 weight 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 and react 10 hours.Then, cool to room temperature, thus the homopolymer solution obtaining solid component concentration 33 % by weight.Then, this homopolymer solution casting is applied on release liner, and dry thus make 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, (TA Instrument Japan company manufactures to use test for viscoelastic machine, model " ARES "), while the shear strain applying frequency 1Hz, in the temperature range of-70 DEG C ~ 150 DEG C, measure visco-elasticity by shear mode with the heat-up rate of 5 DEG C/min, shearing out-of-phase modulus G will be corresponded to " summit temperature temperature (G " curve very big time temperature) as the Tg of homopolymer.

The method obtaining acrylic polymers 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 substep 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 (polymer solvent) used in solution polymerization suitably can be selected from existing known organic solvent.Can use such as: be selected from the aromatics classes such as toluene (aromatic hydrocarbon based typically); The acetate esters such as ethyl acetate; Aliphatics or the alicyclic hydro carbons such as hexane, hexanaphthene, methylcyclohexane; The haloalkane hydro carbons such as 1,2-ethylene dichloride; The lower alcohols such as Virahol (such as the unary alcohol of carbonatoms 1 ~ 4); The ethers such as t-butyl methyl ether; Any one solvent of the ketones such as methylethylketone etc. or two or more mixed solvents.

The initiator used during polymerization suitably can be selected from existing known polymerization starter according to the kind of polymerization process.Can preferably use such as: 2, one or more of the azo type polymerization initiators such as 2 '-Diisopropyl azodicarboxylate.As other example of polymerization starter, can enumerate: the persulphates such as Potassium Persulphate; The peroxide type initiators such as benzoyl peroxide, hydrogen peroxide; The ethane that phenyl replaces etc. replace ethane initiator; Aromatic carbonyl; Deng.As the other example of polymerization starter, can enumerate: the redox type initiator that superoxide and reductive agent combine.Such polymerization starter can be used alone one or combinationally uses two or more.Such as, as long as the common usage quantity of the usage quantity of polymerization starter, relative to whole monomer component 100 weight part, can select in the scope of about 0.005 ~ about 1 weight part (typically being about 0.01 ~ about 1 weight part).

By described solution polymerization, the polymerization liquid that acrylic polymers is dissolved in the form of organic solvent can be obtained.As the acrylic polymers in technology disclosed herein, the material that can preferably use above-mentioned polymerization liquid or suitable aftertreatment be carried out to this reaction solution and obtains.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 as solution shape in organic solvent.

The weight-average molecular weight (Mw) of the base polymer (preferred acrylic polymers) in technology disclosed herein is not particularly limited, such as, can be 10 × 10 ⁴above and 500 × 10 ⁴following scope.Balance the adhesion characteristics such as operability and resistance to rebound resilience, adhesive power such as releasable from the viewpoint of with high level, the Mw of acrylic polymers is preferably 10 × 10 ⁴~ 150 × 10 ⁴(such as 20 × 10 ⁴~ 75 × 10 ⁴, typically be 35 × 10 ⁴~ 65 × 10 ⁴) scope in.At this, Mw refers to the value that the polystyrene standard obtained by GPC is converted.As GPC device, such as model " HLC-8320GPC " (post: TSKgelGMH-H (S), Dong Cao company manufactures) can be used.Same in embodiment described later.

Tackiness agent in technology disclosed herein can for the composition containing tackifier.As tackifier, be not particularly limited, the various tackifying resins such as such as rosin based tackifying resin, terpenes tackifying resin, hydrocarbon tackifying resin, epoxies tackifying resin, polyamide-based tackifying resin, elastomerics class tackifying resin, phenols tackifying resin, ketone tackifying resin can be used.Such tackifying resin can be used alone one or combinationally uses two or more.

As the concrete example of rosin based tackifying resin, can enumerate: the unmodified rosin (pine gum) such as gum resin, wood rosin, starex; By hydrogenation, disproportionation, polymerization etc., these unmodified rosin are carried out modification and the modified rosin (rosin etc. of staybelite, nilox resin, polymerized rosin, other chemically modified obtained.Lower same); 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 esterification being obtained with alcohols; By the unsaturated fatty acids modified rosin class that unmodified rosin or modified rosin modification obtain by unsaturated fatty acids; By the unsaturated fatty acids modified rosin ester class that rosin esters modification obtains by unsaturated fatty acids; Reduction treatment is carried out to the carboxyl in unmodified rosin, modified rosin, unsaturated fatty acids modified rosin class or unsaturated fatty acids modified rosin ester class 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; Acid catalyst is utilized to make rosin based (unmodified rosin, modified rosin, various rosin derivatives etc.) and phenol addition thermopolymerization and the rosin phenol resins that obtains; Deng.When adopting polymkeric substance based on acrylic polymers, preferably use rosin based tackifying resin.From the viewpoint of adhesion characteristics etc. such as raising resistance to rebound resilience, adhesive powers, more preferably combinationally use different to the kind in above-mentioned rosin based tackifying resin, characteristic (such as softening temperature) etc. more than two or three.

As the example of terpenes tackifying resin, can enumerate: the terpine resins such as α-pinene polymkeric substance, beta-pinene polymer, Dipentine (ジペ Application テ Application) polymkeric substance; By these terpine resin modifications (phenol modification, aromatic modified, hydrogenation modification, hydrocarbon modification etc.) and the modified terpene resin obtained; Deng.As the example of above-mentioned modified terpene resin, can enumerate: terpene phenol resin, styrenated terpene resins, aromatic modified terpine resin, hydrogenated terpene resin etc.When adopting polymkeric substance based on acrylic polymers, preferably use terpenes tackifying resin (such as terpene phenol resin).Particularly, from the viewpoint of adhesion characteristic such as raising resistance to rebound resilience, adhesive power etc., preferably different to the kind in above-mentioned terpenes tackifying resin (such as terpene phenol resin), characteristic (such as softening temperature) etc. one or more are combinationally used.

As the example of hydrocarbon tackifying resin, can enumerate such as: 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 hydrocarbon resins, coumarone resinoid, coumarone-indenes resinoid.

In technology disclosed herein, as above-mentioned tackifying resin, softening temperature (softening temperature) can be preferably used to be the tackifying resin of more than about 70 DEG C (preferably more than about 100 DEG C, more preferably from about more than 110 DEG C).By containing the tackiness agent of tackifying resin of softening temperature with more than above-mentioned lower value, the double-sided adhesive sheet that resistance to rebound resilience is more excellent can be realized.The terpenes tackifying resin (such as terpene phenol resin), rosin based tackifying resin (carboxylate of such as polymerized rosin) etc. in above-mentioned illustrative tackifying resin with such softening temperature can be used.By the tackiness agent of the tackifying resin containing softening temperature more than 140 DEG C, resistance to rebound resilience excellent especially can be realized.Such as, the terpene phenol resin of softening temperature more than 140 DEG C can preferably be used.Technology disclosed herein can preferably with ratio shared in the whole tackifying resins contained in above-mentioned tackiness agent of the tackifying resin of softening temperature more than 140 DEG C more than 50 % by weight, more preferably more than 70 % by weight, further preferably more than 85 % by weight the mode of (such as more than 95 % by weight and less than 100 % by weight) implement.The upper limit of the softening temperature of tackifying resin is not particularly limited, and can be such as less than about 200 DEG C (typically being less than about 180 DEG C).In addition, the value that the softening point test method (ring and ball method) that the arbitrary standard being defined through JIS K5902 and JIS K2207 at the softening temperature of this said tackifying resin specifies 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 weight parts ~ about 100 weight parts (more preferably from about 20 weight parts ~ about 80 weight parts, further preferably about 30 weight parts ~ about 60 weight parts) relative to 100 parts by weight propylene acids polymers.

Linking agent can be used as required in above-mentioned binder composition.The kind of linking agent is not particularly limited, can from existing known linking agent suitable choice for use.As such linking agent, can enumerate 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.Linking agent can be used alone one or combinationally uses two or more.Wherein, from the viewpoint of raising cohesive force, preferably isocyanates linking agent and/or epoxies linking agent is used.The usage quantity of linking agent is not particularly limited, such as, relative to 100 parts by weight propylene acids polymers, can the interior selection of the scope of (such as about 0.005 weight part ~ about 10 weight parts, preferably about 0.01 weight part ~ about 5 weight parts) below about 10 weight parts.

Binder layer in technology disclosed herein, in order to show desired appearance design, optical characteristics (such as opacifying property, light reflective etc.), can carry out painted.This is painted suitably can use the one of known organic or inorganic colourant (pigment, dyestuff etc.) or combinationally use two or more.Such as, by making containing black colorants such as carbon blacks in binder layer, this binder layer can be colored as black.The content of tinting material is not particularly limited, and declines, relative to acrylic polymers 100 weight part, be preferably less than about 15 weight parts (be such as less than about 10 weight parts, typically be and be less than about 5 weight parts) from the viewpoint of suppression adhesion characteristic.

Above-mentioned binder composition can contain various additives general in the field of the binder compositions such as flow agent, crosslinking coagent, softening agent, tenderizer, weighting agent, antistatic agent, antiaging agent, UV light absorber, antioxidant, photostabilizer as required.About so various additives, existing known additive can be used by ordinary method, not give feature of the present invention especially, therefore omit detailed description.

Binder layer disclosed herein can be formed by existing known method.Such as, can adopt and directly applied by binder composition (being coated with typically) to base material and the dry method (direct method) forming binder layer thus.In addition, also can adopt and binder composition is applied to the surface (release surface) with separability is upper and drying forms binder layer thus on a surface, and this binder layer is transferred to the method (transfer printing) on base material.As above-mentioned release surface, the surface of release liner, substrate backside etc. through lift-off processing can be used.From the viewpoint of raising adhesion characteristic (such as resistance to rebound resilience), binder layer advantageous applications transfer printing disclosed herein is formed on the surface of base material.In addition, binder layer disclosed herein is formed typically continuously, but is not limited to such form, can for being formed as the binder layer of the such as rule such as point-like, striated or irregular pattern.

The coating of binder composition can use the existing known coating machines such as such as gravure roll coating machine, die coater, metering bar coater to carry out.Or can by coating adhesive compositions such as dipping or curtain coating methods.

From promotion crosslinking reaction, improve the consideration such as the viewpoint that manufactures efficiency, preferably carry out the drying of binder composition under heating.Drying temperature can be set as such as about 40 DEG C ~ about 150 DEG C, is usually preferably set to about 60 DEG C ~ about 130 DEG C.After dry adhesive composition, in order to the object such as lax of the strain that may exist in the adjustment of the composition transfer in binder layer, the carrying out of crosslinking reaction, base material or binder layer, can carry out aging further.

The thickness of binder layer disclosed herein is not particularly limited, and suitably can select according to object.Usually, consider from viewpoints such as drying efficiency isoproductivity, bond propertiess, the thickness of binder layer is about 5 μm ~ about 200 μm is suitable, is preferably about 10 μm ~ about 150 μm, be more preferably about 15 μm ~ about 100 μm, more preferably about 25 μm ~ about 80 μm.Possess in the double-sided adhesive sheet of binder layer on the two sides of base material, the thickness of each binder layer can be identical, also can be different.

< release liner >

As release liner, usual interleaving paper etc. can be used, be not particularly limited.The surface that such as can be used in the liner substrate such as resin film, paper has the release liner of lift-off processing layer, comprises fluoropolymer (tetrafluoroethylene etc.), the release liner etc. of the low adhesive materials of polyolefin resin (polyethylene, polypropylene etc.).Above-mentioned lift-off processing layer can for utilizing the stripping treatment agents such as such as polysiloxane-based, chain alkyl class, fluorine-containing type, moly-sulfide to carry out surface treatment to above-mentioned liner substrate and the lift-off processing layer that formed.

The size > of < double-sided adhesive sheet

The width of adhesive sheet disclosed herein is not particularly limited.Such as, in the miniaturized electronics that portable electric appts described later is such time, the width that can be configured to adhesive sheet is about below 4mm (such as about below 2mm, typically is about below 1mm, is about below 0.7mm further).Such as, by adopting resin film (preferred polyester based resin film) as base material, even if double-sided adhesive sheet is configured to narrow width as mentioned above, also excellent water-repellancy, punch press process can be realized while meeting all characteristics (such as shock-resistance etc.) required by electronics (such as portable electric appts).

The total thickness of adhesive sheet disclosed herein (containing binder layer and base material, but not containing release liner) is not particularly limited, for the scope of about 60 μm ~ about 1000 μm is suitable.The total thickness of adhesive sheet considers that adhesion characteristic etc. is preferably about 100 μm ~ about 500 μm (such as about 120 μm ~ about 400 μm, typically be about 150 μm ~ about 300 μm).According to technology disclosed herein, even total thickness is more than 100 μm (such as more than 120 μm, typically be more than 150 μm) adhesive sheet, by using the base material of the 3mm decline stress of display regulation, desired characteristic (typically be and take into account releasable and resistance to rebound resilience) also suitably can be realized.In addition, when the total thickness of double-sided adhesive sheet is set as below prescribed value, can be favourable from the viewpoint of the filming, miniaturization, lightweight, saving resource etc. of goods.

The characteristic > of < adhesive sheet

According to an optimal way of technology disclosed herein, can be implemented in resistance to resiliency test and show the resistance to elastic double-sided adhesive sheet that the tilting meeting test film is the level of below 3mm (preferred below 1mm).According to the double-sided adhesive sheet of a particularly preferred mode, can be implemented in the resistance to rebound resilience not observing in fact the level of the tilting of test film in above-mentioned resistance to resiliency test.The double-sided adhesive sheet showing above-mentioned characteristic can become the double-sided adhesive sheet that resistance to rebound resilience improves, discrepancy in elevation tracing ability is also excellent.Resistance to resiliency test carries out in particular by the method recorded in embodiment described later.In addition, resistance to rebound resilience evaluation method described later is the evaluation method low to the dependency degree of rigidity of base material.In addition, for the adhesive sheet possessing soft base material, compared to the annular resiliency test in such as patent documentation 2, be subject to larger screen resilience, therefore can become the evaluation method under more severe condition, and can be described as the resistance to elastic method more strictly can evaluated adhesive sheet and have.

Adhesive sheet disclosed herein preferably shows 180 degree of stripping strengths (180 degree of stripping strengths to stainless steel plate) of more than 12N/20mm.The adhesive sheet showing above-mentioned characteristic can be gluing securely with adherend, can be preferred for objects such as engaging, fixing.Even have in the purposes of the tendency of adhesive area small area like this at the double-sided adhesive sheet such as portable electric appts, high gluing reliability also can be kept.Above-mentioned 180 degree of stripping strengths are more preferably more than 15N/20mm (such as more than 20N/20mm, typically is more than 23N/20mm).180 degree of stripping strengths are measured by the method recorded in embodiment described later.

According to an optimal way of technology disclosed herein, can provide and show the double-sided adhesive sheet that pressing adhesive power is the pressing adhesive power of more than 40N (be more preferably more than 80N, more preferably more than 100N, typically be more than 150N).Press the so high double-sided adhesive sheet of adhesive power when being fitted on component by above-mentioned double-sided adhesive sheet, be not easy to produce the stripping caused by internal stress, gluing reliability is excellent, therefore preferably.Even if having in the purposes of the tendency of adhesive area small area like this at the double-sided adhesive sheet such as portable electric appts, high gluing reliability also can be kept.

Above-mentioned pressing adhesive power is defined as follows: window frame shape (also referred to as " the frame-shaped ") double-sided adhesive sheet utilizing horizontal 59mm, longitudinal 113mm, width 1mm, the framework made by stainless steel (SUS) under the crimping condition of 10 seconds under 0.12MPa and sheet glass are fitted, make sample for evaluation thus, for this sample for evaluation, above-mentioned sheet glass is pressed from interior along the thickness direction of sheet glass, by until sheet glass to be separated the maximum stress that period observes with SUS framework be defined as pressing adhesive power with the load speed of 10mm/ minute.Above-mentioned pressing adhesive power more specifically can by the step measurements recorded in embodiment described later.

According to another optimal way of technology disclosed herein, to can be implemented in shock-resistance evaluation display until fall the double-sided adhesive sheet of shock-resistance of level of the joint undesirable condition such as to break that 10 times (preferably 15 times, more preferably 20 times) do not observe strippings, base material.The double-sided adhesive sheet tolerance meeting this characteristic falls to wait to be impacted and keeps the performance (that is, shock-resistance) of joint excellent, be therefore suitable as such as in portable electric appts etc. for the double-sided adhesive sheet of the joint of parts etc.Shock-resistance evaluation is undertaken by the method recorded in embodiment described later.

According to another optimal way of technology disclosed herein, can be implemented in waterproofing property evaluation the double-sided adhesive sheet of allowing the discrepancy in elevation showing more than 0.01mm (such as more than 0.02mm).Waterproofing property evaluation is undertaken by the method recorded in embodiment described later.In addition, above-mentioned waterproofing property evaluation is held mainly as the evaluation of the water-repellancy between double-sided adhesive sheet and adherend.

Double-sided adhesive sheet disclosed herein preferably shows the elongation at break of more than 300%.By showing above-mentioned elongation at break, the tendency of the flexibility that the display of double-sided adhesive sheet is good improves, and easily realizes resistance to elastic raising.In addition, there is the tendency that releasable (particularly extracting releasable out) is also excellent.Above-mentioned elongation at break is more preferably more than 400% (such as more than 500%, typically be more than 550%).The upper limit of above-mentioned elongation at break is not particularly limited, such as, can be about less than 1000% (typically being about less than 800%).In addition, double-sided adhesive sheet disclosed herein can show the double-sided adhesive sheet of above-mentioned elongation at break at least one (the preferred both sides) in MD direction and CD direction.Above-mentioned elongation at break is measured by the method recorded in embodiment described later.

Double-sided adhesive sheet disclosed herein preferably shows 8N/mm ²above tensile strength.By showing above-mentioned tensile strength, adhesive sheet is not easy to tear when peeling off, and releasable (such as extracting releasable out) improves further.In addition, there is the also excellent tendency of the processibilities such as punch press process.Above-mentioned tensile strength is more preferably 10N/mm ²(such as 12N/mm above ²above, 15N/mm typically is ²above).When above-mentioned tensile strength is too high, the flexibility of base material declines, and has and is difficult to obtain good resistance to elastic tendency, and therefore above-mentioned tensile strength is preferably about 50N/mm ²(such as about 30N/mm below ²below, about 20N/mm typically is ²below).In addition, double-sided adhesive sheet disclosed herein can show the double-sided adhesive sheet of above-mentioned tensile strength at least one (the preferred both sides) in MD direction and CD direction.Above-mentioned tensile strength is measured by the method recorded in embodiment described later.

Double-sided adhesive sheet disclosed herein can have desired optical characteristics (transmissivity, reflectivity etc.).Such as the double-sided adhesive sheet of shading purposes, preferred transmission of visible light is more than 0% and less than 15% (be more preferably more than 0% and less than 10%).In addition, for the double-sided adhesive sheet of luminous reflectance purposes, preferred visible reflectance is more than 20% and less than 100% (be more preferably more than 25% and less than 100%).The optical characteristics of double-sided adhesive sheet can be regulated binder layer or substrate coloring etc. by such as described above.

Double-sided adhesive sheet disclosed herein, from preventing the viewpoints such as metallic corrosion from considering, preferably not halogen-containing.Double-sided adhesive sheet is not halogen-containing to be such as used for electrically at this double-sided adhesive sheet, electronic unit fixing time can become favourable characteristic.In addition, can suppress to produce halogen-containing gas during burning, be also therefore preferred from the viewpoint of alleviating carrying capacity of environment.Not halogen-containing double-sided adhesive sheet can be obtained by the following means of independent or appropriately combined use: do not use wittingly halogen compounds as base material, tackiness agent raw material, use do not coordinate wittingly the base material of halogen compounds, use additive time do not use the additive etc. deriving from halogen compounds.

Double-sided adhesive sheet disclosed herein is not particularly limited, and the adherend that can paste the surface with the elastomeric materials such as resin material, natural rubber, isoprene-isobutylene rubber and their matrix materials etc. such as the inorganic materials such as metallic substance, glass, pottery such as comprising such as stainless steel (SUS), aluminium, polycarbonate (PC), polymethylmethacrylate (PMMA), polypropylene, polyethylene terephthalates (PET) uses.

< purposes >

Double-sided adhesive sheet disclosed herein can realize excellent releasable, and the resistance to rebound resilience that display improves.In addition, in a preferred embodiment, the double-sided adhesive sheet that shock-resistance, water-repellancy, discrepancy in elevation tracing ability are excellent can be become.Therefore, can be suitable as in the handheld device impact caused such as easily being fallen to engage, double-sided adhesive sheet that the object such as fixing, shock absorption uses.In addition; utilize above-mentioned characteristic; electronics applications can be preferably applied to; such as protect the purposes such as use fixed by key-press module component, the decoration panel of televisor fixes use, the series of cells of computer fixes use, the lens waterproof of Digital Video of the fixing use of the protection panel (lens) of the display part of portable electric appts (such as, mobile phone, smart mobile phone, panel computer, notebook computer etc.), mobile phone.As particularly preferred purposes, portable electric appts purposes can be enumerated.Particularly, can be preferred in establish the portable electric appts of liquid crystal indicator.Such as, the purposes etc. will the protection panel (lens) of display part being protected to engage with housing in such portable electric appts is adapted at.

In addition, in this manual, so-called " portable " only can carry not enough, but represents the Portability with the level that individual (grownup of standard) can relatively easily carry.In addition, " lens " in this specification sheets are the hyalosome of the refraction action comprising display light and do not have the concept of hyalosome both sides of refraction action of light.That is, " lens " in this specification sheets comprise the protection panel of display part that do not have refraction action, that merely protect portable electric appts.

In addition, double-sided adhesive sheet disclosed herein, by adopting the base material of the above-mentioned 3mm decline stress of display, can show excellent releasable.Particularly, the performance (extraction releasable) carrying out peeling off in the mode of extracting out between adherend is excellent.At this, extract releasable out and refer to from two adherends fixed by double-sided adhesive sheet stickup, a part for double-sided adhesive sheet is exposed, draws this extending part, double-sided adhesive sheet is extracted out, carries out peeling off again of the fixing releasing of adherend thus.Below, be more specifically described with reference to Fig. 3.

Fig. 3 is the explanatory view schematically showing the mode that extraction is peeled off again, a () starts the figure of the state of extracting double-sided adhesive sheet out for representing, b (), for representing the figure of the state of extracting out in double-sided adhesive sheet, (c) is the figure representing the state after extracting double-sided adhesive sheet out.As shown in Fig. 3 (a), the double-sided adhesive sheet 1 in order to adherend B being fixed to use on adherend A is provided with when fixing from protuberance (タ Block) T that adherend A, B expose.Then, with double-sided adhesive sheet 1, adherend A, B are fixed, after reaching this fixing object, pinch protuberance T when being peeled off by adhesive sheet 1 with finger and carry out pulling with from extracting out between adherend A, B (with reference to Fig. 3 (a)).So double-sided adhesive sheet 1, owing to having the above flexibility of regulation, therefore starts to extend, and along shrinking with the direction pulling direction orthogonal, start to peel off ((b) with reference to Fig. 3) from adherend A, B.Then, whole adhesive area of final double-sided adhesive sheet 1 are stripped, and double-sided adhesive sheet 1 finishes ((c) with reference to Fig. 3) from the extraction between adherend A, B.Thus, the dismounting of the adherend B on adherend A can be easily fixed.

Double-sided adhesive sheet disclosed herein shows the base material of above-mentioned 3mm decline stress by possessing, can realize above-mentioned extraction releasable well, and not need excessive power, and does not produce double-sided adhesive sheet when extracting out and the undesirable condition such as to tear.Utilize such characteristic, double-sided adhesive sheet disclosed herein can be preferred for such as the purposes of stationary battery in the electronic device.The double-sided adhesive sheet being applied to this purposes plays the function of well being fixed by battery, and when terminating removing battery after between the usage period, can realize being easy to remove.In addition, be also suitable as and paste wall or post, furniture, family's electrical article, glass surface etc., use after specified time limit, the object of the adherend again pasted in order to fixing (fixation, be stuck thing etc.) and the double-sided adhesive sheet that uses.In this purposes, adherend is fixed middle double-sided adhesive sheet and is played good fixed function, and when it is removed, by pinching the protuberance be arranged on adhesive sheet etc., this adhesive sheet entirety being extracted out, easily can carry out the dismounting (such as along the dismounting of the direction of arrow in Fig. 3 (c)) of double-sided adhesive sheet thus.

Below, several embodiments related to the present invention are described, but are not intended to the content that limit the invention to shown in embodiment.In addition, in the following description, " part " and " % " is weight basis if not otherwise specified.In addition, each characteristic in below illustrating carries out measuring or evaluating respectively as follows.

[evaluation method]

(1) probe dropping test (3mm, 5mm, 10mm)

Probe dropping test (3mm) is carried out to base material.Particularly, two length of a film 70mm, wide 60mm, polycarbonate (PC) plate of thick 2 μm is prepared.In the double-faced adhesive tape (trade(brand)name " No.5000NS " that the respective single-sided lamination of these two panels PC plates is commercially available, Dong electrician company manufactures, acrylic acid or the like double-faced adhesive tape, 180 degree of stripping strengths: about 16N/20mm), and the hole of diameter 12mm is offered at the center of the PC plate being fitted with this double-faced adhesive tape.Then, clamp the determination object base material being cut into long 70mm, wide 60mm with the face being pasted with this double-faced adhesive tape of described two panels PC plate, and use hand roller to fit, thus make working sample.

Fig. 4 is the explanatory view of the evaluation method representing probe dropping test, a general profile chart that () is working sample, b () makes the general profile chart of the state of probe and determination object substrate contact for representing, (c) represents to make probe drop to the general profile chart of the state of dropping distance D.Symbol 40 represents working sample, and symbol 41 represents determination object base material, and symbol 42a, 42b represent hole, and symbol 43a, 43b represent PC plate, and symbol 44a, 44b represent double-faced adhesive tape, and symbol 45 represents probe.

As shown in (a) and (b) of Fig. 4, working sample 40 level is loaded, the cylindrical probe 45 of diameter 10mm is inserted the hole 42a being arranged in the PC plate 43a of upper side from top and contacts with determination object base material 41.Then, as shown in (c) of Fig. 4, by probe 45 with the speed of 10mm/ minute decline 3mm (in figure, declining in the direction of the arrow) from described contact, and measure stress [N] now.Mensuration carries out three times, and uses its mean value.In figure, the distance that symbol D represents is dropping distance (being 3mm in this test).

In addition, except dropping distance is set as except 5mm, probe dropping test (5mm) is carried out by the method same with probe dropping test (3mm), and except being set as except 10mm by dropping distance, carry out probe dropping test (10mm) by the method same with probe dropping test (3mm).

(2) tensile strength and elongation at break

For base material and double-sided adhesive sheet, measure tensile strength (rupture stress) and elongation at break according to JIS K6767:1999.Particularly, be that dumb bell specimen No. 1 shape (the width 10mm of narrow parallel portion, the length 40mm of this parallel portion) obtains working sample by base material or double-sided adhesive sheet stamping-out.Use universal tensile testing machine (goods name " TG-1kNB ", NMB (ミネベア) company manufactures), tension test is carried out with the draw speed of 500mm/ minute, measure the stress [N] of working sample when dumbbell shape parallel portion is cut off, with its sectional area divided by working sample, obtain tensile strength [N/mm ²].In addition, measure the elongation of working sample during above-mentioned cut-out, be denoted as elongation at break [%].Test carries out three times, and uses its mean value.

(3) 180 degree of stripping strengths

The release liner that will cover an adhesive face of double-sided adhesive sheet is peeled off, and on this adhesive face the PET film of coating thickness 25 μm.Be cut into the size of wide 20mm, long 100mm, thus make working sample.

23 DEG C, under the environment of 50%RH, another adhesive face of said determination sample being exposed, by making 2kg roller once come and go, this another adhesive face being crimped onto the surface of stainless steel plate (SUS304BA plate).After it is placed 30 minutes under equivalent environment, use universal tensile compression testing machine (device name " TG-1kN ", NMB company manufactures), according to JIS Z0237, draw speed 300mm/ minute, measure stripping strength [N/20mm width] under the condition of peel angle 180 °.

(4) adhesive power is pressed

Double-sided adhesive sheet is cut into the window frame shape (frame-shaped) of horizontal 59mm, longitudinal 113mm, wide 1mm, obtains window frame shape double-sided adhesive sheet.Using this window frame shape double-sided adhesive sheet, by crimping 10 seconds under 0.12MPa, the sheet glass of horizontal 59mm, longitudinal 113mm, thick 1.5mm (being used the Gorilla glass that Corning Incorporated manufactures.Lower same) fit with stainless steel (SUS) framework processed (wide 70mm, long 130mm, thick 2mm), thus obtain sample for evaluation.

Fig. 5 is the sketch chart of above-mentioned sample for evaluation, and (a) is vertical view, and (b) is A-A ' sectional view.In addition, Fig. 6 is the explanatory view of the measuring method representing pressing adhesive power.In Fig. 5, Fig. 6, symbol 50 represents window frame shape double-sided adhesive sheet, and symbol 51 represents SUS framework, and symbol 52 represents sheet glass, and symbol 53 represents probe.

By sample for evaluation obtained above 23 DEG C, under the environment of 50%RH after aging 1 hour, be arranged on above-mentioned universal tensile compression testing machine.Then, as shown in Figure 6, make in the frame of the square probe 53 in the rectangular contact face with 55mm × 95mm by SUS framework 51, and this probe is declined (in figure with the speed of 10mm/ minute, decline in the direction of the arrow), press laminated glass 52 along the direction away from SUS framework 51 thus.Then, measure until the maximum stress that observes during being separated with SUS framework 51 of sheet glass 52 is as pressing adhesive power [N].Be determined at 23 DEG C, carry out under the environment of 50%RH.In addition, sample for evaluation measures with the state supply of being fixed on the brace table (not shown) of Compression and Expansion trier near the outer rim of its SUS framework 51.In addition, during above-mentioned pressing adhesive power measures, SUS framework 51 does not bend because of the load by applying by laminated glass 52 with probe 53 or breakage.

(5) shock-resistance

Double-sided adhesive sheet is cut into the window frame shape (frame-shaped) of horizontal 59mm, longitudinal 113mm, wide 1mm, thus obtains window frame shape double-sided adhesive sheet.After an adhesive face of this window frame shape double-sided adhesive sheet being fitted to sheet glass (horizontal 59mm, longitudinal 113mm, thickness 0.5mm), another adhesive face of the window frame shape double-sided adhesive sheet that above-mentioned sheet glass is pasted is fitted to by crimping 10 seconds under 0.12MPa polycarbonate (PC) plate (horizontal 70mm, longitudinal 130mm, thickness 2mm) be fixed on plastics fixture, thus obtain sample for evaluation.

Fig. 7 is the sketch chart of above-mentioned sample for evaluation, and (a) is vertical view, and (b) is its B-B ' sectional view.In Fig. 7, symbol 60 represents window frame shape double-sided adhesive sheet, and symbol 61 represents PC plate, and symbol 62 represents sheet glass.

After 1 hour from above-mentioned laminating, carry out shatter test sample for evaluation being repeatedly free to drop down under normal temperature (about 23 DEG C) concrete slab with the back side of its PC plate (face of the opposition side in the face of fitting with sheet glass) downwards from the height of 1.2m.And often fall once, whether the joint of all visual confirmation PC plate and sheet glass keeps, and record is until the drop number of (separation) peeled off by PC plate with sheet glass.By until falling the average evaluation not observing stripping for 10 times is "○", by until falling the average evaluation not observing stripping for 20 times is " ◎ ".

(6) water-repellancy

Double-sided adhesive sheet is cut into the window frame shape (frame-shaped) of horizontal 40mm, longitudinal 60mm, wide 1mm, thus obtains window frame shape double-sided adhesive sheet.This window frame shape double-sided adhesive sheet is pasted the outer edge of polymethylmethacrylate (PMMA) plate of horizontal 40mm, longitudinal 60mm, thickness 1mm, thus make the PMMA plate with window frame shape double-sided adhesive sheet.

The sketch chart of the sample for evaluation that Fig. 8 uses when being and evaluating water-repellancy, (a) is vertical view, and (b) is its C-C ' sectional view.In Fig. 8, symbol 71 represents PC plate, and symbol 72 represents discrepancy in elevation adhesive tape, and symbol 70 represents window frame shape double-sided adhesive sheet, and symbol 73 represents PMMA plate, and symbol 74 represents non-woven fabrics.

As shown in Figure 8, at the discrepancy in elevation adhesive tape 72 of the surface mount width 5mm of PC plate 71.This discrepancy in elevation adhesive tape 72 is for arranging concavo-convex on the surface of PC plate 71.At this, the one side being used in PET base material has the adhesive sheet of binder layer as discrepancy in elevation adhesive tape 72.In order to easily observe with or without infiltration, configure non-woven fabrics 74 respectively in the both sides of discrepancy in elevation adhesive tape 72.Then, this PC plate 71 configures the PMMA plate 73 with window frame shape double-sided adhesive sheet 70 of above-mentioned making, make to cover non-woven fabrics 74 and the central part crosscut discrepancy in elevation in the width direction adhesive tape 72 on the long limit of window frame shape double-sided adhesive sheet 70, then make the roller of 2g once come and go and crimp.

As discrepancy in elevation adhesive tape 72, use the discrepancy in elevation adhesive tape that thickness (aggregate thickness of film substrate and binder layer) is 0.01mm, 0.02mm, 0.03mm, 0.05mm respectively, make and amount to four kinds of sample for evaluations.In these sample for evaluations, the PMMA plate 73 with window frame shape double-sided adhesive sheet 70 pastes on PC plate 71 by concavo-convex (discrepancy in elevation) across the height corresponding with the thickness of each discrepancy in elevation adhesive tape 72.In addition, by step similar to the above except not using discrepancy in elevation adhesive tape, make the sample for evaluation without the discrepancy in elevation.

Waterproof evaluation test, based on IPX7 standard (JIS C 0920/IEC60529), is submerged in the tank of depth of water 1m 30 minutes by each sample for evaluation that the discrepancy in elevation is different under standard state (23 DEG C, 50%RH) and also confirms to carry out with or without inside infiltration.

In addition, sample for evaluation is being carried out after aging 30 minutes by above-mentioned waterproof evaluation test under above-mentioned standard state.In addition, for each discrepancy in elevation, 8 sample for evaluations are used to carry out evaluating (i.e. n=8).

For the sample for evaluation having the discrepancy in elevation, all do not observe at 8 samples the value that in the discrepancy in elevation of infiltration, the discrepancy in elevation is the highest and be expressed as " allowing the discrepancy in elevation " [mm].This allows that the discrepancy in elevation is larger, then have the water-repellancy under the condition of the discrepancy in elevation higher.In addition, for the sample for evaluation without the discrepancy in elevation, in any one example described later, all do not observe infiltration.

(7) resistance to rebound resilience

Double-sided adhesive sheet is cut into the size of wide 20mm, long 180mm, the first adhesive face exposed is pasted the aluminium sheet being cut into the thickness 0.5mm of same size and carry out lining, thus made test film being peeled off by the first release liner.By this test film 23 DEG C, use laminating machine to be crimped onto under the environment of 50%RH to be cut into the PC plate of the thickness 2mm of 30mm × 200mm size after, place 24 hours under equivalent environment.Then, as shown in Figure 9, be the arc-shaped of chord length 190mm by the PC plate benging being pasted with test film.It is kept 72 hours under the environment of 70 DEG C, the end measuring above-mentioned test film tilt from PC plate surface distance h (mm) (Figure 10).In Fig. 9 ~ 10, symbol 100,200,300 represents double-sided adhesive sheet, aluminium sheet, PC plate after removing first release liner and the second release liner respectively.

[preparation of base material]

Prepare the base material No.1 ~ No.7 with the thickness shown in table 1, probe dropping test characteristic.The PBT film substrate of base material No.1 ~ No.3 is base material terephthalic acid (TP) and BDO (BD) and polyoxytetramethylene glycol (OTMG) being configured as film like with the PBT that the ratio that the mol ratio ((TP+BD): OTMG) of the total of TP and BD and OTMG is about 1:1 is copolymerized into and obtaining.In addition, base material No.1 is creamy white, and base material No.4,5 is in black, and base material No.7 is transparent.

Table 1

< example 1>

(preparation of acrylic polymers)

In the reaction vessel possessing stirrer, thermometer, nitrogen introducing tube, reflux condensing tube and dropping funnel, drop into 100 parts of n-butyl acrylates (BA), 5 parts of vinyl-acetic esters (VAc), 3 parts of vinylformic acid (AA), 0.1 part of vinylformic acid 2-hydroxy methacrylate (HEA), 0.2 part as 2 of polymerization starter, 2 '-Diisopropyl azodicarboxylate (AIBN) and the toluene as polymer solvent, at 60 DEG C, carry out solution polymerization 6 hours, thus obtain the toluene solution of acrylic polymers A.The Mw of this acrylic polymers A is 55 × 10 ⁴.

(making of acrylic pressure-sensitive adhesive compositions)

Relative to acrylic polymers A 100 parts contained in above-mentioned toluene solution, add 10 parts of rosin based Resin A (trade(brand)name " HARITACK PCJ ", Harry agate changes into company and manufactures, softening temperature 118 ~ 128 DEG C), 10 parts of rosin based resin B (trade(brand)names " HARITACK SE10 ", Harry agate changes into company and manufactures, softening temperature 75 ~ 85 DEG C), 15 parts of terpene phenolic resinoid A (trade(brand)names " SUMILITERESIN PR-12603N ", Sumitomo Bakelite company manufactures) as tackifying resin, add 2 parts of isocyanates linking agents (trade(brand)name " CORONATE L ", Japanese polyurethane industrial manufactures) as linking agent, and add 6.58 parts of carbon blacks (wherein pigment composition is 32%) as black pigment, thus made the acrylic pressure-sensitive adhesive compositions of example 1.

(making of double-sided adhesive sheet)

Prepare the commercially available release liner of two panels (trade(brand)name " SLB-80W3D ", Zhu Hua converted paper company manufactures).Dried thickness is made to be 60 μm at the above-mentioned binder composition of the upper coating of a respective face (release surface) of these release liners, and 100 DEG C of dryings 2 minutes.Thus, the release surface of above-mentioned two panels release liner form respectively binder layer.

Prepare the base material No.1 that two sides implements Corona discharge Treatment.To fit respectively in the two sides of this base material No.1 the binder layer that is formed on above-mentioned two panels release liner.Above-mentioned release liner former state is residual over the binder layer, for the protection of the surface (adhesive face) of this binder layer.Make obtained structure by the laminating machine (0.3MPa, speed 0.5m/ minute) of 80 DEG C once after, in the baking oven of 50 DEG C aging one day.Thus, the double-sided adhesive sheet of example 1 is obtained.The double-sided adhesive sheet that this double-sided adhesive sheet has the formation of the first binder layer and the second binder layer for having respectively the first surface of PBT film substrate (base material No.1) and second, total thickness is 200 μm.

< example 2>

Monomer composition is changed to the monomer be made up of 93 parts of BA, 7 parts of AA and 0.05 part of vinylformic acid 4-hydroxybutyl (4HBA) form, obtain the toluene solution of acrylic polymers B in addition in the same manner as example 1.The Mw of this acrylic polymers B is 55 × 10 ⁴.

Relative to acrylic polymers B 100 parts contained in above-mentioned toluene solution, add 10 parts of terpene phenol resin B (trade(brand)name " YS Polyster S145 ", pacify former chemistry (ヤス Ha ラケミカ Le) company to manufacture, softening temperature 140 DEG C ~ 150 DEG C) and 30 parts of terpene phenol resin C (trade(brand)names " TAMANOL 803L ", Arakawa Chemical Industries, Ltd. manufactures, softening temperature 145 DEG C ~ 160 DEG C) as tackifying resin, and add 1 part of isocyanates linking agent (trade(brand)name " CORONATE L ", Japanese polyurethane industrial manufactures) as linking agent, make the acrylic pressure-sensitive adhesive compositions of example 2.

Except using acrylic pressure-sensitive adhesive compositions obtained above as except binder composition, make the double-sided adhesive sheet of example 2 in the same manner as example 1.

< example 3>

Monomer composition is changed to the monomer be made up of 100 parts of BA, 5 parts of AA form, obtain the toluene solution of acrylic polymers C in addition in the same manner as example 1.The Mw of this acrylic polymers C is 55 × 10 ⁴.

Use acrylic polymers C obtained above as acrylic polymers, and add 0.03 part of epoxies linking agent (trade(brand)name " TETRAD C " again relative to 100 parts of these acrylic polymerss, gas chemical company of Mitsubishi manufactures), in addition, the acrylic pressure-sensitive adhesive compositions of example 3 has been made in the same manner as example 2.

Except using acrylic pressure-sensitive adhesive compositions obtained above as except binder composition, make the double-sided adhesive sheet of example 3 in the same manner as example 1.

< example 4>

Relative to acrylic polymers A 100 parts, add 10 parts of rosin based Resin A (trade(brand)name " HARITACK PCJ ", Harry agate changes into company and manufactures, softening temperature 118 ~ 128 DEG C), 10 parts of rosin based resin B (trade(brand)names " HARITACK SE10 ", Harry agate changes into company and manufactures, softening temperature 75 ~ 85 DEG C), 5 parts of rosin based resin C (trade(brand)names " M-HDR ", Wuzhou Richenglin Chemical Co., Ltd., Guangxi manufactures), 15 parts of terpene phenolic resinoid A (trade(brand)names " SUMILITERESIN PR-12603N ", Sumitomo Bakelite company manufactures) as tackifying resin, and add 2 parts of isocyanates linking agents (trade(brand)name " CORONATE L ", Japanese polyurethane industrial manufactures) as linking agent, make the acrylic pressure-sensitive adhesive compositions of example 4.

Making dried thickness be except 50 μm except being coated with above-mentioned binder composition, in the release surface of two panels release liner, forming binder layer respectively in the same manner as example 1.Then, use base material No.4 to replace base material No.1, obtain the double-sided adhesive sheet of example 4 in addition in the same manner as example 1.The double-sided adhesive sheet that this double-sided adhesive sheet has the formation of the first binder layer and the second binder layer for having respectively the first surface of PE class foam film substrate (base material No.4) and second, total thickness is 200 μm.

< example 5>

Use base material No.5 replace base material No.1 and the thickness of each binder layer is changed to 25 μm, in addition, obtain the double-sided adhesive sheet of example 5 in the same manner as example 3.

< example 6>

Use base material No.7 to replace base material No.4, in addition, obtain the double-sided adhesive sheet of example 6 in the same manner as example 4.

The result of the above-mentioned evaluation of measuring of the double-sided adhesive sheet of example 1 ~ example 6 is as shown in table 2.In this table 2, also list the schematic configuration of the double-sided adhesive sheet of each example.In addition, in table, "-" expression is not implemented to measure or evaluate.

Table 2

As shown in table 2, use the double-sided adhesive sheet of the example 1 ~ example 3 of the base material of the 3mm decline stress in the scope of display 30 ~ 110N to show excellent resistance to rebound resilience.Think and use the double-sided adhesive sheet of the base material of the above-mentioned decline stress of display can also realize excellent releasable.On the other hand, the 3mm decline stress of the double-sided adhesive sheet of example 4, example 5 is less than 30N, therefore thinks and can not play good releasable.The 3mm decline stress of the double-sided adhesive sheet of example 6, more than 110N, can not realize excellent resistance to rebound resilience.

In addition, the double-sided adhesive sheet of example 1 ~ 3 shows 180 degree of high stripping strengths, pressing adhesive power, therefore can realize excellent glueability.In addition, possess in the example 1 of the formation of the binder layer containing black pigment, obtain 180 degree of stripping strengths, press the relatively low result of adhesive power.

In addition, the double-sided adhesive sheet of example 1 ~ 3 also shows good result in shock-resistance, water-repellancy, therefore thinks and is fit for various uses (purposes such as, engaging the parts of portable electric appts).

Above, understand concrete example of the present invention in detail, but these examples are only illustrate, and do not limit claims.The technology recorded in claims comprises carries out various distortion, change and the technology obtained to above-mentioned illustrative concrete example.

Claims

1. a double-sided adhesive sheet, its binder layer on two sides that there is base material and be arranged on this base material, wherein,

The stress of described base material display 30N ~ 110N in following probe dropping test (3mm);

[probe dropping test (3mm)]

2. double-sided adhesive sheet as claimed in claim 1, wherein, the elongation at break of described adhesive sheet display more than 400%.

3. double-sided adhesive sheet as claimed in claim 1 or 2, wherein, described adhesive sheet display 10N/mm ²above tensile strength.

4. the double-sided adhesive sheet according to any one of claims 1 to 3, wherein, 180 degree of stripping strengths of described adhesive sheet display more than 23N/20mm.

5. the double-sided adhesive sheet according to any one of Claims 1 to 4, wherein, described binder layer is the acrylic adhesive layer containing acrylic polymers.

6. the double-sided adhesive sheet according to any one of Claims 1 to 5, wherein, described base material is the resin film base material of non-foamed.

7. the double-sided adhesive sheet according to any one of claim 1 ~ 6, wherein, described base material is polyolefin resin film base material or polyester resin film base material.

8. the double-sided adhesive sheet according to any one of claim 1 ~ 7, wherein, the thickness of described base material is 70 ~ 200 μm.

9. the double-sided adhesive sheet according to any one of claim 1 ~ 8, it is for engaging the parts of portable electric appts.

10. the double-sided adhesive sheet according to any one of claim 1 ~ 8, wherein, described double-sided adhesive sheet is used for fixing two adherends, and complete this fixing after, by described double-sided adhesive sheet is peeled off from extracting out between these two adherends from these two adherends.