CN106715628A

CN106715628A - Adhesive sheet

Info

Publication number: CN106715628A
Application number: CN201680002551.9A
Authority: CN
Inventors: 丹羽理仁; 西胁匡崇; 西田佳正
Original assignee: Nitto Denko Corp
Current assignee: Nitto Denko Corp
Priority date: 2015-06-15
Filing date: 2016-06-09
Publication date: 2017-05-24
Also published as: JP2017002292A; TWI761306B; TW201708332A; JP2018087340A; KR20180020118A; JP7089368B2

Abstract

Provided is an adhesive sheet in which there is little decrease in performance as a result of narrowing width. The adhesive sheet comprises an adhesive layer on at least one surface of a foam substrate. The relation between the 100% modulus M (N/mm2 substrate) of the adhesive sheet and the density D (g/cm3) of the foam substrate satisfies the expression 9.0 <= (M/D).

Description

Bonding sheet

Technical field

The present invention relates to the bonding sheet for possessing foaming body base material.

This application claims the Japanese patent application 2015-120669 and in June, 2016 that are proposed based on June 15th, 2015 The priority of the Japanese patent application 2016-112701 for proposing for 6th, contents of these applications is incorporated by reference In this specification.

Background technology

(the also referred to as pressure-sensitive adhesive in general, adhesive.It is same as below) presented within the temperature range of near room temperature The state of soft solid (viscoelastic body), and with the simply gluing property in adherend by pressure.By profit Such property is used, adhesive is for example provided with the shape of the bonding sheet with base material of adhesive phase with least one face in base material State, it is widely used in various fields for the purpose such as engagement, fixed.

Compared with the bonding sheet using the plastic foil without bubble structure as base material, by the foaming body with bubble structure The bonding sheet (bonding sheet with foaming body base material) with base material as base material may be formed at impact absorbency, concavo-convex tracing ability etc. The favourable bonding sheet of aspect.In addition, compared with the bonding sheet using non-woven fabrics as base material, may be formed at water proofing property, sealing etc. The favourable bonding sheet of aspect.Therefore, the bonding sheet with foaming body base material is preferably applied to the part in mancarried electronic aid Engagement, fixed etc..As the technical literature for being related to the bonding sheet with foaming body base material, patent document 1,2 can be enumerated.

Prior art literature

Patent document

Patent document 1：International Publication No. 2013/154137

Patent document 2：Japanese patent application discloses 2013-213104 publications

The content of the invention

Invent problem to be solved

In recent years, from product from the viewpoint of miniaturization, lightweight, it is desirable to for the bonding sheet of the engagement etc. of part Narrowing.For example for for mancarried electronic aid display part protection component (such as protective glass) fixation bonding sheet and The viewpoints such as speech, raising, the raising of design freedom from the giant-screen, design of information display section consider, bonding sheet is narrow Widthization is also meaningful.

But, during by bonding sheet narrowing, the Joint Properties (for example pressing adhesive tension) of part tend to reduce.On this Point, the present inventor is conceived to following aspect：The width of bonding sheet be for about 1mm or its below when, it is found that the reduction of Joint Properties More than the phenomenon of the degree envisioned by the reduction of the gluing area along with narrowing.The present invention is in view of the foregoing and complete Into its object is to provide a kind of performance reduction caused by narrowing few bonding sheet.

The means used to solve the problem

A kind of bonding sheet provided by this specification has adhesive phase at least one face of foaming body base material, and 100% modulus M [N/mm of above-mentioned bonding sheet²Base material] density D [g/cm with above-mentioned foaming body base material³] relation meet 9.0≤ (M/D).Can so turn into by bonding sheet 100% modulus M for density D high and inhibit because of the performance reduction that narrowing causes Degree bonding sheet.It should be noted that the M in above-mentioned formula is with N/mm²Base material is (here, "/mm²Base material " refers to " foaming The per unit sectional area 1mm of body base material²") numerical part of unit when representing 100% modulus of bonding sheet, M sheets are as immeasurable Guiding principle number (also identical on the M in other formulas described in this specification).In addition, the D in above-mentioned formula is with g/cm³Unit table Show the numerical part during density of foaming body base material, D sheets are as dimensionless number (in other formulas described in this specification D is also identical).But, it is sometimes right for the ease of reading when being recorded to preferred value scope of M, D etc. in this manual These numerical value confirmatory unit is accompanied by state () for other symbols similarly.

Another bonding sheet provided by this specification has adhesive phase at least one face of foaming body base material, and And 100% modulus M [N/mm of above-mentioned bonding sheet²Base material] meet 0.75 with the relation of the thickness Hs [mm] of above-mentioned foaming body base material <M×Hs.The bonding sheet having characteristics that shows strong resistance for elongation (stretcher strain).Therefore, it is intended to even if entering Row narrowing is not easy to produce because of the damage (stripping, tear of foaming body base material of bonding sheet etc.) at the junction surface that impact causes, Therefore preferably.

In another preferred embodiment, 100% modulus M of preferably above-mentioned bonding sheet is higher than 4.0N/mm²Base material.Show this Even if the bonding sheet of 100% modulus M of sample tends to carry out the damage that narrowing is not easy to the junction surface that generation causes by impact Deng, therefore preferably.

Bonding sheet disclosed herein can preferably with the thickness Hs of above-mentioned foaming body base material as 0.06mm~0.30mm (for example 0.10mm~0.30mm) mode implement.According to the bonding sheet of the foaming body base material for possessing such thickness, can balancedly take into account and connect The thickness in conjunction portion is reduced and good impact resistance.

On a bonding sheet for preferred embodiment, pressing adhesive tension S during width 1.0mm_1.0When [N] is with width 0.3mm Pressing adhesive tension S_0.3The relation of [N] meets following formula：0.3≤S_0.3/S_1.0.Like this along with bonding sheet narrowing pressing The bonding sheet that the reduction of adhesive tension is few for example can have part of the width less than 1.0mm (typically wide with least a portion Linear parts of the degree less than 1.0mm) the form of engagement member suitably utilize.

Bonding sheet disclosed herein is typically with the two-sided both-sided adhesive with adhesive phase of above-mentioned foaming body base material The form of piece is constituted.The bonding sheet (double-sided adhesive sheet with foaming body base material) of such form has to be carried out using the bonding sheet Operational good advantage when engagement, the fixation of part.

As described above, lacking because the performance that narrowing causes is reduced for bonding sheet disclosed herein, is thus suitable for portable The purposes that the part of electronic equipment is engaged.Bonding sheet disclosed herein is for example preferably used as the aobvious of mancarried electronic aid Show portion or display part protect component fluid tight with housing engage so as to protect the electronic equipment being contained in the housing from water, The fixing component of dust.

Brief description of the drawings

Fig. 1 is to show a schematic cross sectional views for the composition of the bonding sheet of implementation method.

Fig. 2 (a) and Fig. 2 (b) are the explanatory diagram of sample for evaluation for showing to be used in the measure for press adhesive tension, Fig. 2 (a) For top view, Fig. 2 (b) are its A-A ' sectional view.

Fig. 3 is the explanatory diagram of the assay method for showing pressing adhesive tension.

Fig. 4 (a) and Fig. 4 (b) are the explanatory diagram for showing the sample for evaluation for falling endurancing, and Fig. 4 (a) is to bow View, Fig. 4 (b) are its B-B ' sectional view.

Fig. 5 is the exploded perspective view of the schematic composition for showing dust tightness evaluation experimental device.

Fig. 6 is the sectional view of the schematic composition for showing dust tightness evaluation experimental device.

Specific embodiment

Hereinafter, the preferred embodiment of the present invention is illustrated.

Here, implement necessary item for of the invention beyond on item specifically mentioned in this specification, this Art personnel can be based on this specification described on invent implementation guidance and application when common technical knowledge and Understand.The present invention can be implemented based on the common technical knowledge of content disclosed in this specification and this area.

It should be noted that in following accompanying drawings, being accompanied by same-sign for playing the component/position of phase same-action sometimes Illustrate, repeat specification is omitted or simplified sometimes.In addition, the implementation method described in accompanying drawing is in order to clearly demonstrate the present invention And carry out signalization, size, the reduced scale of the bonding sheet of the invention of the actual offer of product are not precisely provided.

In this specification, " adhesive " refers to as described above (viscous in soft solid within the temperature range of near room temperature Elastomer) state and with the simply material of the gluing property in adherend by pressure.Bonding said here Agent, such as " C.A.Dahlquist, " Adhesion:Fundamentals and Practice”,McLaren&Sons,(1966), Page 143 " defined, it is however generally that, can be with plural tensile modulus of elasticity E* (1Hz) of satisfaction<10⁷Dyne/cm²Property The material (material with above-mentioned property typically at 25 DEG C) of matter.In addition, " base polymer " of adhesive refers to this Master in adhesive in contained rubber-like polymer (polymer of caoutchouc elasticity is shown within the temperature range of near room temperature) Want composition (that is, accounting for the composition of more than the 50 weight % of the rubber-like polymer).It should be noted that in this manual, such as Fruit is not particularly illustrated, and " main component " refers to the composition for accounting for more than 50 weight %.

The foaming body base material for constituting bonding sheet disclosed herein is the base material for possessing the part with bubble (bubble structure), Typically comprising the base material of at least one of which stratiform foaming body (foaming body layer).Above-mentioned foaming body base material can be by one layer or two The base material that foaming body layer more than layer is constituted.Above-mentioned foaming body base material for example can be for more than substantially only by one layer or two-layer The base material that foaming body layer is constituted.Although being not particularly limited, as one of the foaming body base material in technology disclosed herein Preference, can enumerate the foaming body base material being made up of the foaming body layer of individual layer (a layer).

The thickness Hs of foaming body base material is not particularly limited, can be according to the intensity of bonding sheet, flexibility, application target etc. Appropriate setting.From make junction surface be thinned from the viewpoint of, as the thickness Hs of foaming body base material for, usually 0.70mm with Under be it is appropriate, preferably below 0.40mm, more preferably below 0.30mm.Processability etc. when bonding sheet is processed into narrow Viewpoint consider, technology disclosed herein can preferably with the thickness Hs of foaming body base material as 0.20mm below (typically Below below 0.18mm, such as 0.16mm) mode implement.In addition, the viewpoint such as impact resistance from bonding sheet considers, as hair It is 0.05mm above is appropriate, preferably more than 0.06mm, more preferably more than 0.07mm for the thickness Hs of foam base material (such as more than 0.08mm).Technology disclosed herein can preferably with the thickness Hs of foaming body base material as 0.10mm more than (typical case Ground be more than 0.10mm, be preferably more than 0.12mm, such as 0.13mm more than) mode implement.The thickness of foaming body base material increases When big, it is intended to even if can also play desired impact resistance in the case of further narrowing.It should be noted that The impact resistance of bonding sheet for example can be fallen endurancing, fallen rear waterproof test and evaluated by described later.

Density D (the referred to as apparent densities of foaming body base material.Hereinafter, it is identical in case of no particular description) without spy Do not limit, for example, can be 0.1g/cm³~0.9g/cm³.From from the viewpoint of impact resistance, the density D of foaming body base material is 0.8g/cm³The following is appropriate, preferably 0.7g/cm³(such as 0.6g/cm below³Below).In a mode, foaming body The density D of base material can be less than 0.5g/cm³, or less than 0.4g/cm³(such as 0.5g/cm³Below).In addition, from resistance to From the viewpoint of impact, the density D of foaming body base material is preferably 0.12g/cm³Above, more preferably 0.15g/cm³Above, enter One step is preferably 0.2g/cm³The above (such as 0.3g/cm³More than).In a mode, the density D of foaming body base material can be 0.4g/cm³More than, or 0.5g/cm³(it is greater than 0.5g/cm above³), can be further 0.55g/cm³More than. It should be noted that the density D (apparent density) of foaming body base material can be measured according to JIS K 6767.

In a preferred embodiment, the density D of above-mentioned foaming body base material can be 0.3g/cm³~0.8g/cm³.At density Impact absorbency is readily obtained in the foaming body base material of above range well and the value of (M/D) foaming body base material high.Therefore, Possess the bonding sheet of such foaming body base material can be formed junction surface impact resistance it is good and can suppress to draw because of narrowing The bonding sheet of the degree of the performance reduction for rising.

The mean air bubble diameter of foaming body base material is not particularly limited, from the sight that the performance for suppressing to cause by narrowing is reduced Point consideration, preferably less than 300 μm, more preferably less than 200 μm, more preferably less than 150 μm.From performance higher performance Water proofing property, dust tightness from the viewpoint of, the mean air bubble diameter of foaming body base material is preferably less than 120 μm, more preferably 100 Below μm (typically less than 90 μm, such as less than 80 μm, further be less than 70 μm).In technology disclosed herein, pass through Reduce the mean air bubble diameter of foaming body base material, it is intended to even if the rear water proofing property that falls for example as be described hereinafter is received at narrow place like that Water proofing property, dust tightness are also easily kept to impact.In addition, reducing the one kind of mean air bubble diameter as the value for increasing above-mentioned M/D Method can also be effective, therefore preferably.The lower limit of mean air bubble diameter is not particularly limited, and is examined from the viewpoint of impact resistance Consider, usually 10 μm above is appropriate, preferably more than 20 μm, more preferably more than 30 μm, be more preferably 40 μm with Upper (such as more than 50 μm).In a mode, mean air bubble diameter can be more than 55 μm, or more than 60 μm.Need It is noted that mean air bubble diameter said here refers to that the section of foaming body base material is observed using electron microscope Obtained from, ball conversion mean air bubble diameter.

Contained bubble is preferably in the top view of the foaming body base material to be closer to round shape in foaming body base material. That is, the mean air bubble diameter of the longitudinal direction (hereinafter also referred to " MD ") of preferably foaming body base material and width be (hereinafter also referred to " CD ") mean air bubble diameter do not have big difference.The shape of above-mentioned bubble can be with the foaming with the round-shaped degree for differing The mean air bubble diameter (MD mean air bubble diameters) on MD of body base material is relative to the foaming body base material on the average of CD The ratio between bubble diameter (CD mean air bubble diameters), " aspect ratio (MD/CD) " being expressed from the next are grasped as index.This is indulged It is horizontal than (MD/CD) closer to 1, then it may be said that the shape in the top view of bubble contained in foaming body base material is closer to circle.

Aspect ratio (MD/CD)=MD mean air bubble diameters/CD mean air bubble diameters

In one mode of technology disclosed herein, the aspect ratio (MD/CD) of contained bubble is preferred in foaming body base material It is more than 0.7, more preferably more than 0.75, more preferably more than 0.8, for example, can is more than 0.85.In a mode In, aspect ratio can be more than 0.9, or more than 0.95 (e.g., from about more than 1.0).In addition, above-mentioned aspect ratio (MD/CD) Preferably less than 1.3, more preferably less than 1.25, more preferably less than 1.2, for example can be less than 1.15.By upper Aspect ratio (MD/CD) is stated not excessively less than 1, having used the operability of the bonding sheet of above-mentioned foaming body base material can improve.In addition, By making above-mentioned aspect ratio (MD/CD) not excessively more than 1, used the bonding sheet of above-mentioned foaming body base material water proofing property (for example, It is described later to fall rear water proofing property), dust tightness can improve.Can be (special with the form with narrow width part for constituting as described later It is not the form of the annular component with narrow width part) for the foaming body base material of bonding sheet that utilizes, above-mentioned aspect ratio (MD/CD) It is especially meaningful close to 1.

Here, the MD of foaming body base material refers to extrusion direction of the foaming body base material in manufacturing process.Although without spy Do not limit, but the MD of the foaming body base material of the isometric size shape of banding is generally consistent with its dimensional directions long.In addition, foaming body base material CD refer to surface orthogonal with the MD of the foaming body base material and along the foaming body base material direction.The foaming body base material Thickness direction (hereinafter also referred to " VD ") is and above-mentioned MD and the orthogonal directions of above-mentioned CD.

The MD mean air bubble diameters of foaming body base material are measured in the manner as described below.

That is, by above-mentioned foaming body base material its CD substantially central portion along the plane parallel with MD and VD (i.e. vertical line Towards the plane consistent with CD) cutting, and the central portion of its cut surface is shot using SEM (SEM).To be clapped The image printing taken the photograph on image on the paper of A4 sizes, depicting a straight line of the length 60mm parallel with MD.Now, adjust The multiplication factor for saving SEM causes to there are about 10~about 20 bubbles on the straight line of 60mm.By visual observation to being present on The number of bubbles stated on straight line is counted, and calculates MD mean air bubble diameters by following formula.

MD mean air bubble diameters (μm)=60 (mm) × 10³/ (number of bubbles (individual) × multiplication factor)

The CD mean air bubble diameters of foaming body base material are measured in the manner as described below.

That is, by above-mentioned foaming body base material along (i.e. the direction of vertical line is consistent with MD puts down with the plane that its CD and VD are parallel Face) cutting, and the central portion of its cut surface is shot using SEM.By captured image printing on the paper of A4 sizes, in image On depict a straight line of the length 60mm parallel with CD.Now, the multiplication factor of regulation SEM is caused on the straight line of 60mm There are about 10~about 20 bubbles.Counted to being present in the number of bubbles on above-mentioned straight line by visual observation, and under passing through State formula and calculate CD mean air bubble diameters.

CD mean air bubble diameters (μm)=60 (mm) × 10³/ (number of bubbles (individual) × multiplication factor)

It should be noted that when describing straight line, straight line being formed as far as possible and running through gas in the case where not contacted with bubble point The state of bubble.It it is 1 by the bubble counting in the case where a part of bubble is contacted with rectilinear point.Additionally, straight in shape It it is 0.5 by the bubble counting in the case of the state that both ends do not extend through bubble and are located in bubble.

The mean air bubble diameter of all directions of foaming body base material (can for example be sent out by adjusting the composition of the foaming body base material Usage amount of infusion etc.), manufacturing condition (condition in foamed process, stretching process etc.) controls.

For the foaming body base material in technology disclosed herein, it may be preferred to use 10% compressive strength C₁₀[kPa] With 30% compressive strength C₃₀The relation of [kPa] meets following formula：(C₃₀/C₁₀)≤5.0；Foaming body base material.Here, foaming body base 10% compressive strength of material is to instigate cut into the square shape of 30mm square by the foaming body base material and be overlapped and formed The thickness of about 2mm, by resulting measure specimen holder between a pair of plates, compresses it 10% equivalent to initial thickness Amount of thickness when load (load during compression ratio 10%).That is, refer to that said determination sample is compressed to equivalent to initial The load during thickness of the 90% of thickness.For 30% compressive strength C₃₀[kPa] and 25% compressive strength C described later₂₅[kPa] It is also the load again it is when referring to the amount of thickness that will determine sample compression equivalent to 30% or the 25% of initial thickness.

Compressive strength under any compression ratio of foaming body base material is measured according to JIS K 6767.It is specific to determine step Suddenly it is：Said determination sample is arranged at the central portion of above-mentioned a pair of plates, by making the narrower intervals of above-mentioned flat board and continuous Be compressed to arbitrary compression ratio, flat board is stopped and is determined by the load after 10 seconds.The compression of foaming body base material is strong Degree can be for example controlled by constituting the degree of cross linking and density, the size and shape of bubble etc. of the material of foaming body base material.

Compressive strength ratio (C₃₀/C₁₀) the small degree for meaning compression the influence that is caused to compressive strength of difference it is small.Example Such as, causing there are the concavo-convex situation such as the discrepancy in elevation, cut, the partly different feelings of width of bonding sheet on composition surface because of bonding sheet Condition or when causing the part at junction surface to bear the situation of bigger stress than other parts because of bonding sheet, can be by A part for bonding sheet is larger compressed than other parts.During by bonding sheet narrowing, because of the above-mentioned discrepancy in elevation, local width difference Tend to become more notable etc. the difference of the degree of the compression for causing.Because of the difference of the compressive strength that the difference of the degree compressed causes When different excessive, strain concentrates on the part that the degree of compression changes, and the part is likely to become the stripping of bonding sheet, foaming The starting point of the damage of body base material.For having used (C₃₀/C₁₀) small foaming body base material bonding sheet for, because of above-mentioned compression The difference of the compressive strength that the difference of degree causes is small, therefore is not susceptible to above-mentioned stripping, the damage of foaming body base material.From resistance to punching From the viewpoint of hitting property is improved, this is favourable.From from the viewpoint of obtaining more preferable effect, (C₃₀/C₁₀) it is more preferably 4.5 Below, more preferably less than 4.0.(C₃₀/C₁₀) can be less than 3.5.(C₃₀/C₁₀) lower limit be not particularly limited, for example Can be more than 3.0 for 2.5 above is appropriate.

25% compressive strength C of foaming body base material₂₅It is not particularly limited, for example can be for more than 20kPa (typically More than 40kPa).On C₂₅, usually 250kPa is above is appropriate, preferably more than 300kPa (such as more than 400kPa). Even if possess the bonding sheet of such foaming body base material and can turn into also waiting the impact good durability of performance to falling for narrow Bonding sheet.For example, the bonding sheet for being better protected from the tear because of the bonding sheet that impact causes can be turned into.C₂₅The upper limit do not have Especially limitation, usually below 1300kPa (such as below 1200kPa) is appropriate.In a mode, C₂₅Can be Below 1000kPa, or 800kPa, can be further below 600kPa (such as below 500kPa).Using possessing C₂₅ [kPa] and apparent density D [g/cm³] relation meet following formula：150≤C₂₅× D≤400 (such as 200≤C₂₅It is × D≤350, excellent Elect 240≤C as₂₅×D≤300)；Foaming body base material bonding sheet, be capable of achieving more preferable result.

In another preferred embodiment, the C of foaming body base material₂₅20kPa~200kPa (typically 30kPa can be adjusted to ~150kPa, such as 40kPa~120kPa).Possesses the bonding sheet of such foaming body base material due to strong by being compressed for density Degree is relatively low, even if therefore it is the also excellent bonding sheet of narrow resiliency that can turn into.For example, absorbed by foaming body base material falling Impact, can be better protected from the stripping of bonding sheet.According to possessing C₂₅[kPa] and apparent density D [g/cm³] relation meet under Formula：100≤C₂₅/ D≤400 (such as 150≤C₂₅/ D≤350, preferably 200≤C₂₅/D≤300)；Foaming body base material it is viscous Piece is closed, more preferable result is capable of achieving.

The tensile elongation of foaming body base material is not particularly limited.For instance, it may be preferable to using the tensile elongation of longitudinal direction (MD) Rate is the foaming body base material of 200%~800% (more preferably 400%~600%).Additionally, it is preferred that the drawing of width (TD) Stretch the foaming body base material that elongation is 50%~800% (more preferably 200%~500%).The elongation of foaming body base material according to It is measured according to JIS K 6767.The elongation of foaming body base material for example can be by the degree of cross linking, apparent density (expansion ratio) Etc. being controlled.

The tensile strength (tensile strength) of foaming body base material is not particularly limited.For instance, it may be preferable to using longitudinal direction (MD) Tensile strength is the foaming body base material of 5MPa~35MPa (preferably 10MPa~30MPa).Additionally, it is preferred that width (TD) Tensile strength is the foaming body base material of 1MPa~25MPa (more preferably 5MPa~20MPa).The tensile strength of foaming body base material according to It is measured according to JIS K6767.The tensile strength of foaming body base material for example can be by the degree of cross linking, apparent density (expansion ratio) Etc. being controlled.

The material of foaming body base material is not particularly limited.It is generally preferably (plastic foamed comprising the foaming body by plastic material Body) formed foaming body layer foaming body base material.Plastic material for forming plastic foam material (is containing comprising elastomeric material Justice) it is not particularly limited, can suitably be selected from known plastic material.Plastic material can be used alone a kind of or suitable It is two or more when being applied in combination.

As the concrete example of plastic foam material, can enumerate：The polyolefin such as polyethylene foaming body, polypropylene foaming body Resinoid foaming body；It is polyethylene terephthalate foaming body, PEN foaming body, poly- to benzene The polyester resin foaming bodies such as dioctyl phthalate butanediol ester foaming body；The polyvinyl chloride resin systems such as polyvinyl chloride foaming body Foaming body；Vinyl acetate esters resin foaming body；Polyphenylene sulfide foaming body；Fatty polyamide (nylon) resin-made The amide-type resin-made foaming bodies such as foaming body, fully aromatic polyamide (aromatic polyamides) resin-made foaming body；Polyimide Resin-made foaming body；Polyether-ether-ketone (PEEK) foaming body processed；The styrene resin foaming body such as polystyrene foaming body；It is poly- The urethane based resin foaming bodies such as urethane resin-made foaming body；Deng.In addition, as plastic foam material, it is possible to use chlorine The rubber resin foaming body such as buna foaming body.

Used as preferred foaming body, (hereinafter also referred to " TPO foams can to illustrate polyolefin resin foaming body Body ").As the plastic material (i.e. polyolefin resin) for constituting TPO foaming body, can use without particular limitation Known or usual various polyolefin resins.Can enumerate for example：Low density polyethylene (LDPE) (LDPE), LLDPE (LLDPE), polyethylene, polypropylene, ethylene-propylene copolymer, the ethylene-vinyl acetate c such as high density polyethylene (HDPE) (HDPE) Thing etc..As the example of LLDPE, can enumerate：Ziegler-Natta catalyst linear low density polyethylene, metallocene catalysis Formulation LLDPE etc..Such polyolefin resin can be used alone it is a kind of or it is appropriately combined using two kinds with On.

As the preference of the foaming body base material in technology disclosed herein, seen from impact resistance, water proofing property, dust tightness etc. Point considers, can enumerate：Substantially be made up of the foaming body of polythylene resin polyethylene kind foaming body base material, substantially by The TPO foaming body base materials such as the PP type foaming body base material that the foaming body of polypropylene-based resin is constituted.Here, polyethylene Resinoid refers to the resin using ethene as principal monomer (that is, the main component in monomer), except HDPE, LDPE, LLDPE etc. In addition, ethylene-propylene copolymer, the ethylene-vinyl acetate c of the copolymerization ratios more than 50 weight % of ethene be may also include Thing etc..Equally, polypropylene-based resin refers to the resin using propylene as principal monomer.As the foaming in technology disclosed herein Body base material, preferably uses polyethylene kind foaming body base material.

The manufacture method of above-mentioned plastic foam material (typically TPO foaming body) is not particularly limited, and can suitably adopt With known various methods.For example, can be by the forming process including above-mentioned plastic material or above-mentioned plastic foam material, crosslinking work The method of sequence and foamed process is manufactured.In addition, stretching process can be included as needed.

Method as above-mentioned plastic foam material is crosslinked, can enumerate for example：Use the chemistry of organic peroxide etc. Cross-linking method or the crosslinking by ionizing radiation method of irradiation ionising radiation etc., these methods can be used together.As above-mentioned ionising radiation, Can illustrate：Electron beam, alpha ray, β rays, gamma-rays etc..The dosage of ionising radiation is not particularly limited, it may be considered that foaming Target properties (such as degree of cross linking) of body base material etc. and be set as appropriate dose of radiation.

Filler (inorganic filler, organic filler etc.) can as needed be coordinated in above-mentioned foaming body base material, prevented The various additions such as old agent, antioxidant, ultra-violet absorber, antistatic additive, lubricant, plasticizer, fire retardant, surfactant Agent.

On the foaming body base material in technology disclosed herein, in order that the bonding sheet for possessing the foaming body base material shows Desired design, optical characteristics (for example, light-proofness, light reflective etc.), can be coloured.In the coloring, can be with A kind of or appropriately combined colouring agent using two or more known organic or inorganics is used alone.

For example, in the case that bonding sheet disclosed herein is used for into shading purposes, the transmission of visible light of foaming body base material It is not particularly limited, in the same manner as the transmission of visible light of bonding sheet described later, preferably 0%~15%, more preferably 0%~ 10%.In addition, by bonding sheet disclosed herein be used for light reflection purposes in the case of, the visible reflectance of foaming body base material with The visible reflectance of bonding sheet is similarly preferably 20%~100%, more preferably 25%~100%.

The transmission of visible light of foaming body base material can be by using spectrophotometer (such as high-new skill of Co., Ltd. Hitachi Spectrophotometer, the model " U-4100 " of art manufacture) determined under wavelength 550nm and shone from a surface side of foaming body base material The intensity to the light of another surface side is penetrated and passes through to obtain.The visible reflectance of foaming body base material can be by using above-mentioned Spectrophotometer determines the intensity of a face for exposing to foaming body base material and the light for reflecting to obtain under wavelength 550nm.Need It is noted that the transmission of visible light of bonding sheet, visible reflectance can also be obtained by same method.

In the case that bonding sheet disclosed herein is used for into shading purposes, above-mentioned foaming body base material is preferably colored as black. As black, in terms of L* (brightness) specified in L*a*b* color specification systems, preferably less than 35 (such as 0~35), more preferably 30 Below (such as 0~30).It should be noted that a*, b* specified in L*a*b* color specification systems respectively can be appropriate according to the value of L* Selection.As a*, b*, be not particularly limited, preferably both be -10~10 (more preferably -5~5, more preferably - 2.5~scope 2.5).For example, it is preferable to a* and b* are 0 or approximate 0.

It should be noted that in this manual, L*, a*, b* can be by using colors specified in L*a*b* color specification systems Color difference meter (for example, color evaluating, trade name " CR-200 " of the manufacture of Minolta company) is measured to obtain.Need Bright, L*a*b* color specification systems are the colour spaces that International Commission on Illumination (CIE) was recommended in 1976, refer to be referred to as The colour space of CIE1976 (L*a*b*) color specification system.In addition, L*a*b* color specification systems are advised in Japanese Industrial Standards by JIS Z 8729 It is fixed.

The black colorant used during as by foaming body substrate coloring for black, it is possible to use such as：Carbon black (furnace black, Channel black, acetylene black, thermals, lampblack etc.), graphite, cupric oxide, manganese dioxide, nigrosine, perylenes are black, titanium is black, cyanine Black, activated carbon, ferrite (non magnetic ferrite, magnetic ferrites etc.), magnetic iron ore, chromium oxide, iron oxide, molybdenum bisuphide, chromium Complex compound, combined oxidation species black pigment, the organic black pigment of Anthraquinones etc..From from the viewpoint of cost, availability, make It is preferred black colorant, carbon black can be illustrated.The usage amount of black colorant is not particularly limited, and can be set as with energy The mode for enough assigning desired optical characteristics suitably adjusts the amount for obtaining.

In the case that bonding sheet disclosed herein is used for into light reflection purposes, above-mentioned foaming body base material is preferably colored as white Color.As white, in terms of L* (brightness) specified in L*a*b* color specification systems, preferably more than 87 (such as 87~100), more preferably It is more than 90 (such as 90~100).A*, b* specified in L*a*b* color specification systems can suitably be selected according to the value of L* respectively.Make It is a*, b*, for example preferably both are the scope of -10~10 (more preferably -5~5, more preferably -2.5~2.5).Example Such as, preferably a* and b* are 0 or approximate 0.

As the white color agents used when by foaming body substrate coloring being white, can enumerate for example：Titanium dioxide (gold The titanium dioxide such as red stone-type titanium dioxide, anatase titanium dioxide), zinc oxide, aluminum oxide, silica, zirconium oxide, oxidation Magnesium, calcium oxide, tin oxide, barium monoxide, cesium oxide, yittrium oxide, magnesium carbonate, calcium carbonate (precipitated calcium carbonate, powdered whiting etc.), Barium carbonate, zinc carbonate, aluminium hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, alumina silicate, magnesium silicate, calcium silicates, sulfuric acid Barium, calcium sulfate, barium stearate, zinc white, zinc sulphide, talcum, silica, aluminum oxide, clay, kaolin, titanium phosphate, mica, The inorganic white color agents such as gypsum, white carbon, diatomite, bentonite, lithopone, zeolite, sericite, hydrated halloysite；Third It is olefin(e) acid resinoid particle, polystyrenic resin particles, polyurethane based resin particle, amide-type resin particle, polycarbonate-based Organic off-white colors such as resin particle, polysiloxane-based resin particle, melocol resinoid particle, melamine class resin particle Colouring agent etc..The usage amount of white color agents is not particularly limited, and can be set as that desired optical characteristics can be assigned Mode suitably adjust the amount for obtaining.

Implement appropriate surface treatment in surface that can be as needed to foaming body base material.The surface treatment for example can be Chemically treatment or physical treatment for improving the adhesiveness to adjacent material (such as adhesive phase).As the table The example of face treatment, can enumerate：Corona discharge Treatment, chromic acid are processed, irradiated exposed to ozone, exposed to flame, ultraviolet Treatment, plasma treatment, coating silane coupling agent (priming paint) etc..

Bonding sheet disclosed herein has adhesive phase at least one face of foaming body base material.Constitute the viscous of adhesive phase The species of mixture is not particularly limited.Above-mentioned adhesive for example can be by containing selected from acrylic compounds, polyesters, carbamic acid In the various polymer such as esters, polyethers, rubber-like, polysiloxane-based, polyamide-based, fluorine-containing type (binding property polymer) one Kind or it is two or more based on polymer (main component in component of polymer, the composition for accounting for more than 50 weight %) glue The adhesive that mixture composite is formed.Technology disclosed herein is for example preferably with the bonding sheet that possesses acrylic adhesives Form is implemented.

Here, " acrylic adhesives " refer to the adhesive of the polymer based on acrylic polymer." propylene Acids polymers " refer to (below, to be claimed sometimes with the monomer with least one (methyl) acryloyl group in a molecule It is " acrylic monomer ") as the main composition monomer component (list of the main component of monomer, i.e. composition acrylic polymer The composition for being accounted in the total amount of body more than 50 weight %) polymer.In addition, in this manual, " (methyl) acryloyl group " is general Represent to including property acryloyl group and methylacryloyl.Similarly, " (methyl) acrylate " synoptically represents acrylate And methacrylate.

Aforesaid propylene acids polymers are typically using (methyl) alkyl acrylate as main composition monomer component Polymer.As above-mentioned (methyl) alkyl acrylate, for example, can preferably use the compound represented by following formula (1).

CH₂=C (R¹)COOR² (1)

Here, the R in above-mentioned formula (1)¹It is hydrogen atom or methyl.R²It is the alkyl that carbon number is 1~20.It is easy to get calmly To from the viewpoint of the excellent adhesive of adhesion characteristic, preferably R²It is that carbon number is 2~14 (below, sometimes by such carbon The Range Representation of atomicity is C_2-14) alkyl (methyl) alkyl acrylate.As C_2-14Alkyl concrete example, can be with Enumerate：Methyl, ethyl, propyl group, isopropyl, normal-butyl, isobutyl group, sec-butyl, the tert-butyl group, n-pentyl, isopentyl, neopentyl, N-hexyl, n-heptyl, n-octyl, iso-octyl, 2- ethylhexyls, n-nonyl, isononyl, positive decyl, isodecyl, n-undecane Base, dodecyl, n-tridecane base, n-tetradecane base etc..

In a preferred embodiment, in the total amount of the monomer for being used in the synthesis of acrylic polymer, about 50 weight % The above (typically 50 weight %~99.9 weight %), more preferably more than 70 weight % (typically 70 weight %~ 99.9 weight %), e.g., from about more than 85 weight % (typically 85 weight %~99.9 weight %) are by selected from above-mentioned formula (1) R²It is C_2-14(methyl) alkyl acrylate (more preferably C_4-10(methyl) alkyl acrylate；Particularly preferably propylene One of sour N-butyl and 2-EHA or both) in one or more occupy.According to by such The acrylic polymer that monomer composition is obtained, easily forms the adhesive of the good adhesion characteristic of display, therefore preferably.

Although being not particularly limited, as acrylic polymer, it may be preferred to had with hydroxyl (- OH) using copolymerization Acrylic monomer (hydroxy acryl acid class monomer) acrylic polymer.According to the acrylic compounds that the copolymerization is constituted Polymer, is readily obtained the excellent adhesive of the balancing good of bonding force and cohesiveness, releasable, therefore preferably.

Hydroxy acryl acid class monomer can be used alone a kind of or be applied in combination two or more.As hydroxy acryl acid The concrete example of class monomer, can enumerate：(methyl) acrylic acid 2- hydroxy methacrylates, (methyl) acrylic acid 2- hydroxy propyl esters, (methyl) Acrylic acid 3- hydroxy propyl esters, (methyl) acrylic acid 2- hydroxybutyls, (methyl) acrylic acid 4- hydroxybutyls, (methyl) acrylic acid 2- The own ester of hydroxyl, the own ester of (methyl) acrylic acid 6- hydroxyls, (methyl) acrylic acid 8- hydroxyls monooctyl ester, (methyl) acrylic acid 10- hydroxyl last of the ten Heavenly stems (methyl) acrylic acid hydroxy alkyl esters such as ester, (methyl) acrylic acid 12- hydroxylauric esters.Furthermore, it is possible to illustrate：Acrylic acid (4- hydroxyls Ylmethyl cyclohexyl) methyl esters, polypropylene glycol list (methyl) acrylate, N- hydroxyethyls (methyl) acrylamide, N- hydroxyls third Base (methyl) acrylamide etc..Wherein, preferred (methyl) acrylic acid hydroxy alkyl ester, the alkyl in particularly preferred above-mentioned hydroxyalkyl is Carbon number is (methyl) acrylic acid hydroxy alkyl ester of 2~4 straight chained alkyl.

About in the total amount of the monomer that hydroxy acryl acid class monomer is preferably used in the synthesis of acrylic polymer Used in the range of 0.001 weight %~about 10 weight %.Thus, it is capable of achieving to make above-mentioned bonding force with cohesiveness with higher level The bonding sheet of balance.It is for about 0.01 weight %~about 5 weight % (examples by the way that the usage amount of hydroxy acryl acid class monomer is set Such as from about 0.05 weight %~about 2 weight %), it is capable of achieving more preferable result.Or, the acrylic polymer in technology disclosed herein Compound can be the acrylic polymer that non-copolymerization has hydroxy acryl acid class monomer.

Can be with not damaging in the range of effect of the present invention significantly, in the acrylic polymer in technology disclosed herein Copolymerization has monomer other than the above (other monomers).The monomer for example can be for the vitrifying of regulation acrylic polymer Transition temperature, regulation bond properties (such as fissility) etc. purpose and use.For example, as can improve adhesive cohesiveness, The monomer of heat resistance, can enumerate：Monomer containing sulfonic group, phosphorous acid-based monomers, cyano-containing monomer, vinyl ester, aromatic series Vinyl compound etc..In addition, as can be introduced in acrylic polymer can turn into crosslinking basic point functional group or Can help to improve the monomer of adhesive tension, can enumerate：Carboxyl group-containing monomer, monomer containing anhydride group, amide-containing monomer, containing amino Monomer, monomer containing imide, containing epoxy based monomers, (methyl) acryloyl morpholine, vinyl ethers etc..For example, it is preferable to copolymerization There is acrylic polymer of the carboxyl group-containing monomer as above-mentioned other monomers.

As monomer containing sulfonic group, can illustrate：Styrene sulfonic acid, allyl sulphonic acid, 2- (methyl) acrylamidos -2- Methyl propane sulfonic acid, (methyl) acryamidopropanesulfonic acid, (methyl) sulfopropyl acrylate, (methyl) acryloxy naphthalene sulphur Acid, sodium vinyl sulfonate etc..

As phosphorous acid-based monomers, can illustrate：Acryloyl phosphoric acid 2- hydroxy methacrylates.

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

As vinyl ester, can illustrate for example：Vinyl acetate, propionate, vinyl laurate etc..

As aromatic ethenyl compound, can illustrate：Styrene, chlorostyrene, 1-chloro-4-methyl-benzene, Alpha-Methyl benzene Ethene, other substituted phenylethylenes etc..

As carboxyl group-containing monomer, can illustrate：Acrylic acid, methacrylic acid, (methyl) carboxyethyl acrylates, (methyl) Acrylic acid carboxyl pentyl ester, itaconic acid, maleic acid, fumaric acid, crotonic acid, iso-crotonic acid etc..

As monomer containing anhydride group, can enumerate：Maleic anhydride, itaconic anhydride, the anhydride form of above-mentioned carboxyl group-containing monomer Deng.

As amide-containing monomer, can illustrate：Acrylamide, Methacrylamide, acrylamide, N- ethene Base pyrrolidones, N, N- DMAAs, N, N- dimethylmethacryl amides, N, N- acrylamides, N, N- Diethyhnethacrylamide, N, N '-methylene-bisacrylamide, N, N- dimethylaminopropylacryls acid amides, N, N- diformazans Base propyl methacrylamide, DAAM etc..

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

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

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

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

Such " other monomers " can be used alone one kind, it is also possible to be applied in combination two or more, but above-mentioned other lists Preferably set in the total amount of the monomer that the total amount of body is used in the synthesis of acrylic polymer is for about below 40 weight % (allusion quotations Type ground be for about 0.001 weight %~about 40 weight %), more preferably setting be for about below 30 weight % (typically about 0.01 weights Amount %~about 30 weight %, e.g., from about 0.1 weight %~about 10 weight %).Using carboxyl group-containing monomer as above-mentioned other monomers In the case of, its content in above-mentioned monomer total amount for example, it can be set to be 0.1 weight %~10 weight %, be typically set at 0.2 weight %~8 weight %, for example it is set as that 0.5 weight %~5 weight % is appropriate.In addition, using vinyl ester In the case that (such as vinyl acetate) is as above-mentioned other monomers, its content is in above-mentioned monomer total amount for example, it can be set to being 0.1 weight %~20 weight %, it is appropriate to be typically set at 0.5 weight %~10 weight %.

The copolymerization composition of acrylic polymer is less than -15 DEG C to cause the glass transition temperature (Tg) of the polymer The mode of (typically -70 DEG C~-15 DEG C) be designed be it is appropriate, preferably less than -25 DEG C (such as -60 DEG C~-25 DEG C), more preferably less than -40 DEG C (such as -60 DEG C~-40 DEG C).The viewpoints such as the impact resistance from bonding sheet consider, preferably by third The Tg of alkene acids polymers is adjusted to below above-mentioned higher limit.The Tg of acrylic polymer can change monomer group by appropriate Adjusted into (that is, the species of the monomer for being used in the synthesis of the polymer, usage amount ratio).

Here, in this specification, the Tg of polymer is referred to the copolymerization composition based on the polymer, is obtained by Fox formulas Tg.So-called Fox formulas, it is as follows, it is the Tg of copolymer and the homopolymerization that each monomer for constituting the copolymer is polymerized alone The relational expression of the glass transition temperature Tg i of thing.

1/Tg=Σ (Wi/Tgi)

It should be noted that in above-mentioned Fox formulas, Tg represents the glass transition temperature (unit of copolymer：K), Wi is represented The weight fraction (copolymerization ratios of weight basis) of the monomer i in the copolymer, Tgi represents the vitrifying of the homopolymers of monomer i Transition temperature (unit：K).

As the glass transition temperature of the homopolymers used in the calculating of Tg, the value described in known data is used.Example Such as, for the monomer of act set forth below, using following values as the homopolymers of the monomer glass transition temperature.

The glass transition temperature of the homopolymers on the monomer beyond foregoing illustrative, uses " Polymer Numerical value described in Handbook (polymer handbook) " (the 3rd edition, John Wiley＆Sons, Inc, 1989).For this article The monomer of various values is recorded in offering, using peak.

Monomer on also not recording the glass transition temperature of its homopolymers in the above documents, using by following The value (disclosing 2007-51271 publications referring to Japanese patent application) that assay method is obtained.Specifically, to possess thermometer, 100 weight parts monomers, the isobutyl of 0.2 weight portion azo two are put into the reactor of agitator, nitrogen introducing tube and reflux condensing tube Nitrile and 200 weight portions are stirred 1 hour as the ethyl acetate of polymer solvent while nitrogen is circulated.In this way The oxygen in polymerization system is removed, 63 DEG C is then heated to and is reacted 10 hours.Then, room temperature is cooled to, solid constituent is obtained Concentration is the homopolymers solution of 33 weight %.The homopolymers solution curtain coating is coated on release liner, and is dried, so that Make the test specimen (homopolymers of sheet) of thickness about 2mm.The test specimen is punched into the discoid of diameter 7.9mm, is pressed from both sides Between parallel-plate, using test for viscoelastic device (manufacture of TA Instruments companies, ARES), applying frequency 1Hz's Determined by shear mode with 5 DEG C/min of programming rate within the temperature range of -70 DEG C~150 DEG C while shear strain Viscoplasticity, using the summit temperature of tan δ (loss angle tangent) as glass transition temperature.

Although being not particularly limited, on aforesaid propylene acids polymers, in the synthesis of the acrylic polymer In the total amount of the monomer for using, the glass transition temperature of homopolymers is that the ratio shared by less than -45 DEG C of monomer is preferably 50 More than weight % (more preferably more than 70 weight %, such as more than 85 weight %).According to the acrylic acid that such copolymerization is constituted Birds of the same feather flock together compound, impact resistance is tended to improve.The upper limit of aforementioned proportion is not particularly limited, and can be above-mentioned monomer total amount 100 weight %.The viewpoints such as the coherency from adhesive consider, are less than -45 DEG C generally by the glass transition temperature of homopolymers The ratio shared in above-mentioned monomer total amount of monomer be set as that 99 weight %, the following is appropriate, are preferably set to 97 weight % Below.

In technology disclosed herein, the method for obtaining acrylic polymer is not particularly limited, and may be appropriately used molten Liquid polymerization, emulsion polymerization, mass polymerization, suspension polymerization etc. are known as the synthetic method of acrylic polymer Various polymerizations.For example, solution polymerization process can be preferably used.As monomer supply method when carrying out polymerisation in solution, can (dripped using the batch mode for disposably supplying whole raw material monomers, continuous supply (dropwise addition) mode, substep supply with appropriate Plus) mode etc..Polymerization temperature can suitably be selected according to monomer and the species of solvent, the species of polymerization initiator for being used etc. Select, for example, it can be set to for about 20 DEG C~about 170 DEG C (typically about 40 DEG C~about 140 DEG C).

The initiator used in polymerization can be fitted according to the species of polymerization from known or usual polymerization initiator Work as selection.For example preferably use double (the 2- methyl-props amidine) dithionates of 2,2 '-azodiisobutyronitrile, 2,2 '-azo, 2,2 '- The azo type polymerization initiators such as double (2- amidine propanes) dihydrochlorides of azo.As other examples of polymerization initiator, Ke Yilie Lift：The persulfates such as potassium peroxydisulfate, ammonium persulfate；The peroxide such as benzoyl peroxide, TBHP, hydrogen peroxide Class initiator；The substitution ethane initiators such as phenyl substitution ethane；Aromatic carbonyl；Deng.As polymerization initiator Other other examples, can enumerate the redox type initiators obtained by the combination of peroxide and reducing agent.As institute The example of redox type initiators is stated, can be enumerated：Combination, the mistake of the peroxide such as aqueous hydrogen peroxide solution and ascorbic acid Combination of combination, persulfate and sodium hydrogensulfite of the peroxide such as oxidation aqueous solution of hydrogen and iron (II) salt etc..Polymerization triggers Agent can be used alone a kind of or be applied in combination two or more.The usage amount of polymerization initiator is common usage amount, example Such as, can be from about 0.005~about 1 weight portion (typically about 0.01~about 1 weight relative to the weight portion of whole monomer components 100 Amount part) scope selection.

The solvent (polymer solvent) used in polymerisation in solution can suitably selected from known or usual organic solvent.Can make With for example：Selected from the aromatic compound such as toluene, dimethylbenzene species (typically arene)；The acetate esters such as ethyl acetate； The aliphatic such as hexane, hexamethylene, hexahydrotoluene or ester ring type hydro carbons；The alkyl halide hydro carbons such as 1,2- dichloroethanes；Isopropanol, 1- The lower alcohols such as butanol, sec-butyl alcohol, the tert-butyl alcohol (such as unary alcohol of carbon number 1~4)；The ethers such as t-butyl methyl ether； The ketones such as methyl ethyl ketone, acetylacetone,2,4-pentanedione；Any one solvent or two or more mixed solvents in.For example can be with The polymerization for being in 40 DEG C~150 DEG C scopes of (preferably 60 DEG C~150 DEG C, typically 70 DEG C~130 DEG C) using boiling point is molten Agent (can be mixed solvent).

By polymerisation in solution, the polymerization liquid of acrylic polymer dissolving form in organic solvent is can obtain. Adhesive phase in technology disclosed herein can be by containing above-mentioned polymerization liquid or to the reaction solution implement it is appropriate after The adhesive phase that the adhesive composition of acrylic polymer solution obtained from treatment is formed.It is poly- as aforesaid propylene acids For polymer solution, can be used that above-mentioned polymerization liquid is adjusted to the acrylic polymer after debita spissitudo as needed is molten Liquid.Or, it is also possible to using by the polymerization (such as emulsion polymerization, photopolymerization, polymerisation in bulk etc.) beyond polymerisation in solution Acrylic acid synthesizing birds of the same feather flock together compound and make the acrylic polymer dissolve in organic solvent and prepare acrylic polymer Solution.

The weight average molecular weight (Mw) of acrylic polymer is not particularly limited, for example, can be 10 × 10⁴~500 × 10⁴ Scope.From from the viewpoint of the balance for easily obtaining adhesion characteristic, the Mw of acrylic polymer is preferably in 10 × 10⁴~ 150×10⁴Scope, more preferably 15 × 10⁴~100 × 10⁴Scope, more preferably 20 × 10⁴~75 × 10⁴Model Enclose.It should be noted that the Mw of acrylic polymer can be by the solvent soluble ingredient (example to the acrylic polymer Such as tetrahydrofuran soluble ingredient) carry out GPC (gel permeation chromatography) and obtained in the form of the value of polystyrene standard conversion.

Adhesive composition (such as acrylic pressure-sensitive adhesive compositions) in technology disclosed herein can be set containing thickening Fat.As tackifying resin, it is not particularly limited, can be used alone one kind or be applied in combination two or more such as rosins, terpene The various tackifying resins such as alkenes, hydro carbons, epoxies, polyamide-based, elastomer class, phenols, ketone.

As the concrete example of rosin tackifying resin, can enumerate：The unmodified pine such as gum rosin, wood rosin, Starex Fragrant (pine gum)；Modified rosin (hydrogenation obtained from these unmodified rosins are modified by hydrogenation, disproportionation, polymerization etc. Rosin after rosin, disproportionated rosin, newtrex, other chemical sex modifications etc.)；Other various rosin derivatives；Deng.As upper The example of rosin derivative is stated, can be enumerated：(that is, the rosin of material obtained from unmodified rosin is esterified using alcohols Carboxylate), modified rosin (hydrogenated rosin, disproportionated rosin, newtrex etc.) is esterified using alcohols obtained from thing The rosin esters such as matter (that is, the carboxylate of modified rosin)；Unmodified rosin or modified rosin is (hydrogenated rosin, disproportionated rosin, poly- Close rosin etc.) the unrighted acid modified rosin class obtained from unrighted acid is modified；By rosin esters profit Unrighted acid modified rosin esters obtained from being modified with unrighted acid；To unmodified rosin, modified rosin (hydrogenated rosin, disproportionated rosin, newtrex etc.), unrighted acid modified rosin class or unrighted acid modified rosin ester Carboxyl in class carries out rosin alcohols obtained from reduction treatment；The pines such as unmodified rosin, modified rosin, various rosin derivatives The slaine of fragrant class (particularly rosin esters)；By making phenol, (unmodified rosin, modified rosin, various rosin spread out with rosin Biology etc.) addition and carry out rosin phenol resin obtained from thermal polymerization under an acid catalysis；Deng.

As the example of terpenes tackifying resin, can enumerate：Australene alkene polymer, beta-pinene polymer, dipentene (dipentene) terpene resin such as polymer；These terpene resins are modified (phenol is modified, aromatic modified, hydrogenation changes Property, hydrocarbon it is modified etc.) obtained from modified terpene resin；Deng.As the example of above-mentioned modified terpene resin, can enumerate：Terpenes Phenol resin, styrenated terpene resins, aromatic modified terpene resin, hydrogenated terpene resin etc..

As the example of hydrocarbon tackifying resin, can enumerate：Aliphatic category hydrocarbon resin, fragrant same clan hydrocarbon resin, aliphatic Class ring-type hydrocarbon resin, aliphatic aromatic class Petropols (styrene-olefin analog copolymer etc.), the aliphatic alicyclic ring same clan The various hydrocarbon resins such as Petropols, hydrogenated hydrocarbon resins, tonka-bean ketone resins, coumarone-indene resin.As aliphatic category hydrocarbon Resin, it is for about one or more aliphatic hydrocarbon in 4~about 5 alkene and diene that can illustrate selected from carbon number Polymer etc..As the example of above-mentioned alkene, can enumerate：1- butylene, isobutene, 1- amylenes etc..As the example of above-mentioned diene Son, can enumerate：Butadiene, 1,3- pentadienes, isoprene etc..As the example of fragrant same clan's hydrocarbon resin, carbon can be enumerated Atomicity is for about 8~about 10 same clan containing vinyl aromatic hydrocarbon (styrene, vinyltoluene, AMS, indenes, methyl Indenes etc.) polymer etc..As the example of aliphatic category ring-type hydrocarbon resin, can enumerate：By so-called " C4 petroleum distillates " or Ester ring type hydrocarbon resinoid obtained from being polymerized after " C5 petroleum distillates " Cyclodimerization；Cyclic diene compound (cyclopentadiene, Dicyclopentadiene, ethylidene norbornene, dipentene etc.) polymer or its hydride；By fragrant same clan's hydrocarbon resin or fat Fat race fragrance same clan Petropols it is fragrant hydrogenated obtained from ester ring type hydrocarbon resinoid；Deng.

It it is for about 100 DEG C preferably using softening point (softening temperature) as above-mentioned tackifying resin in technology disclosed herein The tackifying resin of the above (preferably from about more than 120 DEG C, even more preferably about more than 135 DEG C).According to containing with above-mentioned lower limit It is worth the adhesive of the tackifying resin of the softening point of the above, is capable of achieving the more excellent bonding sheet of resistance to resilience.Foregoing illustrative thickening In resin, preferably viscosified using the terpenes tackifying resin (such as terpene phenol resin), rosin with such softening point Resin (carboxylate of such as newtrex) etc..Above-mentioned tackifying resin is more than 135 DEG C for example preferably with containing softening point The mode of terpene phenol resin is used.In addition, according to the adhesive containing the tackifying resin that softening point is more than 140 DEG C, being capable of achieving Especially excellent resistance to resilience.For instance, it may be preferable to use the terpene phenol resin that softening point is more than 140 DEG C.Tackifying resin it is soft The upper limit for changing point is not particularly limited, for example, it can be set to for about less than 200 DEG C (typically about less than 180 DEG C).Need Bright, the softening point of tackifying resin can be surveyed based on softening point test method (ring and ball method) specified in JIS K 2207 It is fixed.

The usage amount of tackifying resin is not particularly limited, and can suitably be set according to target bond properties (adhesive tension etc.). For example, in terms of solid constituent benchmark, relative to the weight portion of acrylic polymer 100, preferably with about 10~about 100 weight portions The ratio of (even more preferably about 15~about 80 weight portions, more preferably about 20~about 60 weight portions) uses tackifying resin.

As the example of the preferred composition of acrylic adhesives disclosed herein, can enumerate：Relative to acrylic acid Composition, phase that the weight portion of compound 100 of birdsing of the same feather flock together contains the tackifying resin that softening point is more than 120 DEG C with the ratio of 20~60 weight portions The thickening tree that softening point is more than 135 DEG C is contained with the ratio of 10~50 weight portions for the weight portion of acrylic polymer 100 Composition of fat etc..According to the acrylic adhesives of such composition, it is intended to can suitably take into account resistance to resilience and flexibility.

Crosslinking agent can be as needed used in adhesive composition.The species of crosslinking agent is not particularly limited, can be with From known or usual crosslinking agent (for example, isocyanates crosslinking agent, epoxies crosslinking agent,Oxazolines crosslinking agent, aziridine Class crosslinking agent, melamine class crosslinking agent, peroxide crosslinking agent, ureas crosslinking agent, metal alkoxide class crosslinking agent, metal chelating Compound class crosslinking agent, metallic salt crosslinking agent, carbodiimide class crosslinking agent, amine cross-linking agent etc.) in appropriate selection use.Hand over Connection agent can be used alone a kind of or be applied in combination two or more.The usage amount of crosslinking agent is not particularly limited, for example, relatively In the weight portion of acrylic polymer 100 can from below about 10 weight portions (e.g., from about 0.005~about 10 weight portion, preferably from about 0.01~about 5 weight portion) in the range of select.

Adhesive composition can as needed contain levelling agent, crosslinking coagent, plasticizer, softening agent, filler, colouring agent (pigment, dyestuff etc.), antistatic additive, age resistor, ultra-violet absorber, antioxidant, light stabilizer etc. are in adhesive composition Common various additives in field.On such various additives, known can be added using existing by conventional method Plus agent, feature of present invention is not assigned especially, therefore omits detailed description.

Bonding sheet (can be the form of the isometric size shape of banding) disclosed herein is comprising foaming body base material and is configured at The adhesive phase at least one face of the foaming body base material and constitute.The bonding sheet can be only the one of foaming body base material Individual face has adhesive phase, is the form of the one side bonding sheet of cohesive surface (adhesive surface) so as to the only face.So One side bonding sheet for example by using the method beyond bonding (for example, using the method for adhesive, the method for carrying out thermal welding Deng) adherend will be fixed on without the face of adhesive phase side, thus can be used for engagement, the fixation of part.It is disclosed herein Bonding sheet is typically preferably (double with foaming body base material with the two-sided double-sided adhesive sheet with adhesive phase in foaming body base material Face bonding sheet) form implement.Simplicity of such double-sided adhesive sheet for example from the bonding operation of part, engagement quality it is steady It is favourable that the viewpoint such as qualitative considers.

Bonding sheet disclosed herein for example can be the both-sided adhesive with cross-section structure as schematically indicated in FIG. 1 Piece.The double-sided adhesive sheet 1 possess sheet foaming body base material 15, respectively by the base material 15 double side support first adhesive phase 11 and second adhesive phase 12.More specifically, at the first face 15A and the second face 15B (being non-peel-away) point of base material 15 First adhesive phase 11 and second adhesive phase 12 are not provided with.As shown in figure 1, using the two-sided of preceding (before being pasted on adherend) Bonding sheet 1 can be that the release liner 17 for being release surface with front 17A and back side 17B is overlapped and is wound into spiral helicine shape State.The double-sided adhesive sheet 1 of the form protects the surface (second of second adhesive phase 12 using the front 17A of release liner 17 Adhesive surface 12A) and using release liner 17 back side 17B protect first adhesive phase 11 surface (the first adhesive surface 11A).Or, or the first adhesive surface 11A and the second adhesive surface 12A are protected respectively using the release liner of two panels independence Form.

As release liner, it is possible to use usual peeling paper etc., it is not particularly limited.Can be using for example：In plastics The surface of the liner substrates such as film, paper has the release liner of lift-off processing layer；Comprising fluorine-containing type polymer (polytetrafluoroethylene (PTFE) etc.), The release liner of the low adhesive materials such as polyolefin resin (polyethylene, polypropylene etc.)；Deng.Above-mentioned lift-off processing layer for example may be used Think and surface is carried out to above-mentioned liner substrate using stripping treatment agents such as polysiloxane-based, chain alkyl class, fluorine-containing type, molybdenum sulfides The lift-off processing layer for processing and being formed.

As the method for the formation adhesive phase on foaming body base material, can be using existing known various methods.Can arrange Citing is such as：Adhesive composition is directly coated at the method for foaming body base material (direct method), is coated with appropriate release surface Adhesive composition in the release surface so as to form adhesive phase and the adhesive phase is fitted in foaming body base material and is carried out Method (transfer printing) of transfer etc..These methods can be applied in combination.In addition, for first adhesive phase and second adhesive phase Distinct methods can be used.The coating of adhesive composition for example can using gravure roll coating machine, reverse roll coater, The known or usual coating machines such as kiss-roll coater, dipping roll coater, bar coater, knife type coater, flush coater Come carry out.In the case of using the adhesive composition containing solvent, from promotion cross-linking reaction, the viewpoints such as manufacture efficiency are improved Consider, the adhesive composition is dried under heating.

The thickness of adhesive phase is not particularly limited, and can be set according to the application target of bonding sheet, target capabilities. For example, can be for about 5 μm~about 150 μm by the setting of the thickness of adhesive phase.From make the slimming of bonding sheet and bond properties with High level balance from the viewpoint of, as the thickness of adhesive phase for, typically about more than 10 μm (preferably from about 15 μm with It is upper, even more preferably about more than 20 μm, e.g., from about more than 25 μm) be appropriate, in addition, less than about 100 μm (preferably from about 90 μm with Under, even more preferably about less than 80 μm, e.g., from about less than 60 μm) be appropriate.In a mode, the thickness of adhesive phase is for example Can be about 10 μm~about 100 μm (preferably from about 15 μm~about 90 μm, even more preferably about 20 μm~about 80 μm).From bonding sheet The viewpoints such as slimming consider, can be for about less than 50 μm by the setting of the thickness of adhesive phase, can be further configured to about 40 μm Below (e.g., from about less than 35 μm).

The gross thickness of bonding sheet disclosed herein is not particularly limited, and typically about more than 0.07mm is (typically about More than 0.08mm, be preferably from about more than 0.09mm, even more preferably about more than 0.10mm, e.g., from about more than 0.12mm) be it is appropriate, Can be about more than 0.15mm.In addition, the gross thickness on bonding sheet, typically about below 0.80mm are (typically about Below 0.50mm, be preferably from about below 0.40mm, even more preferably about below 0.35mm) be appropriate, can be about 0.30mm with Under (e.g., from about below 0.25mm, further be for about below 0.20mm).It is above-mentioned upper by the way that the gross thickness of bonding sheet is set as Below limit value, can become favourable at aspects such as the filming of product, miniaturization, lightweight, resources conservations.In addition, passing through The gross thickness of bonding sheet is set as more than above-mentioned lower limit, the excellent impact resistance of display, water proofing property, dust-proof can be turned into The bonding sheet of property etc..In a mode, the gross thickness of bonding sheet can be about 0.07mm~about 0.80mm and (for example be for about 0.08mm~about 0.50mm) scope, can be 0.09mm~0.40mm (typically about 0.10mm~about 0.35mm, such as For about 0.12mm~about 0.30mm, be for about further 0.12mm~about 0.25mm) scope, or can be about 0.15mm~about The scope of 0.35mm.

For in bonding sheet disclosed herein, the gross thickness Ht [mm] of the thickness Hs [mm] of foaming body base material in the bonding sheet In shared ratio be not particularly limited.From from the viewpoint of easily and efficiently taking into account impact resistance and bond properties, generally will Hs/Ht setting be for about 20%~about 80% be it is appropriate, preferably set be for about 30%~about 70% (e.g., from about 40%~about 60%).

It should be noted that in the case of the bonding sheet of the form that adhesive surface is protected by release liner, it is said here Do not include the thickness of release liner in the gross thickness of bonding sheet.Thus, for example for double-sided adhesive sheet as shown in Figure 1, By from the thickness Ht of the first adhesive surfaces of adhesive surface 11A to second 12A (i.e. from an adhesive surface to the thickness of another adhesive surface) As the gross thickness of bonding sheet.

Do not damaging in the range of effect of the present invention significantly, bonding sheet disclosed herein can also comprising except foaming body base material With layer (intermediate layer, the priming coat etc. beyond adhesive phase；Hereinafter also referred to " other layers ").For example, can be in foaming body base material Above-mentioned other layers are set and the surface (adhesive surface) of adhesive phase between.For the bonding sheet of such composition, it is above-mentioned its The thickness of its layer is included in the gross thickness of bonding sheet.

For a bonding sheet for preferred embodiment of technology disclosed herein, 100% modulus M [N/mm of the bonding sheet²Base Material] with constitute the bonding sheet foaming body base material density D [g/cm³] relation meet 9.0≤(M/D).Meet such closing The bonding sheet of system can turn into the bonding sheet that can suppress the degree because of the performance reduction that narrowing causes.Although need not explain that it is former Cause, but think for example as described below.That is, the M/D of bonding sheet means for stretcher strain that greatly the bonding sheet presses foaming body base material Density for show resistance high.Here, when bonding sheet deforms because of tension, the usual bonding sheet and adherend Contact area (bond area) is reduced.Bond area is small from the beginning for narrow bonding sheet, therefore, it is intended to because The influence that the reduction of the bond area that stretcher strain causes is caused to bond properties is especially big.For the big bonding sheets of M/D, It is difficult to correspond to tension and produce the reduction of bond area, it is believed that this advantageously contributes to suppress because of the performance that narrowing causes The degree of reduction.

In a preferred embodiment, the value of M/D can be more than 9.5, can be more than 10.0, can also be more than 10.5 (such as more than 11.0).When the value of M/D increases, it is intended to can preferably suppress because of the journey of the performance reduction that narrowing causes Degree.The upper limit of M/D is not particularly limited, and from the ease of manufacturing of foaming body base material or obtains the viewpoints such as easiness and considers, generally For 50 the following is appropriate, preferably less than 40, more preferably less than 30 (such as less than 25).In a preferred embodiment, M/D Can be less than 20, can also be less than 15.

Here, 100% modulus M [N/mm of bonding sheet²Base material] it is measured in the manner as described below.That is, will determine The sample (bonding sheet) of object cuts into the size of width 10mm, length 40mm so as to make test film.Now, it is set as experiment The length direction of piece is the direction consistent with the longitudinal direction of sample (MD).By the test film in 23 DEG C of temperature, the measure ring of 50%RH Under border in being vertically disposed at cupping machine in the form of causing test length (length between chuck) for 10mm, with 50mm/ points The draw speed of clock is vertically stretched.When the rate of change of above-mentioned test length is reached into 100% (when being stretched to 20mm) Intensity conversion into the per unit sectional area of foaming body base material intensity, and by resulting value [N/mm²Base material] as above-mentioned sample 100% modulus (hereinafter also referred to " MD modulus ") on the MD of product.

In addition to the length direction of test film to be set as the width (TD) orthogonal with the MD of sample, with it is above-mentioned The same mode of measure of MD modulus, obtains 100% modulus [N/mm on the TD of the sample²Base material] (hereinafter also referred to " TD moulds Amount ").

By the 100% modulus M [N/mm that above-mentioned MD modulus and above-mentioned TD modulus averagely obtain above-mentioned sample²Base Material].

From from the viewpoint of the directional dependence for reducing impact resistance, preferably MD modulus does not differ very big with TD modulus.Though So it is not particularly limited, but MD modulus [N/mm²Base material] relative to TD modulus [N/mm²Base material] the ratio between for example, it can be set to be 0.3 ~3, it is usually preferred in the range of 0.5~2, be more preferably in the range of 0.6~1.5.

100% modulus M of bonding sheet disclosed herein is not particularly limited, for example, can be 2.5N/mm²It is more than base material. When 100% modulus M of bonding sheet is high, also tend to be better protected from for narrow bonding sheet led because of external force such as impacts The damage of the foaming body base material of cause.In addition, it is intended to easily suppress along with the performance reduction of narrowing.Examined from the viewpoint Consider, 100% modulus M is preferably above 4.0N/mm²Base material, more preferably 4.5N/mm²It is more than base material, more preferably 5.0N/ mm²More than base material (typically greater than 5.0N/mm²Base material, for example, 5.5N/mm²More than base material).One preferred embodiment it is viscous The 100% modulus M for closing piece can be 6.0N/mm²It is more than base material.In addition, considering from viewpoints such as flexibilities, the 100% of bonding sheet Modulus M is usually 12.0N/mm²Base material is the following is appropriate, preferably 10.0N/mm²Below base material, it is more preferably 8.0N/mm² Below base material.100% modulus M of bonding sheet for example can be by the degree of cross linking of foaming body base material and density (apparent density), gas Size and shape of bubble etc. is controlled.

It should be noted that by 100% modulus M of bonding sheet with per unit the sectional area (/mm of foaming body base material²Base material) The form of numerical value the reason for represent because：Adhesive phase is shared in 100% tensile strength of bonding sheet disclosed herein Contribution it is generally minimum, therefore, if when above-mentioned tensile strength is scaled into per unit sectional area comprising adhesive phase cut Area, the characteristic of the bonding sheet for being difficult to grasp the purpose for being suitable for the application on the contrary.

Bonding sheet disclosed herein is preferred：100% modulus M [N/mm²Base material] with the density D [g/cm of foaming body base material³] with The relation of mean air bubble diameter P [μm] of foaming body base material meets following formula：70≤(M/D)/(P×10^-3).Meet the viscous of above-mentioned formula Lacking because the performance that narrowing causes reduces (for example, reduction of pressing adhesive tension) for piece is closed, and is possessed by bubble for density The more foaming body base material of number, even if the rear water proofing property that falls that therefore, it can turn into for example as be described hereinafter is subject at narrow place like that Impact can also keep water proofing property, the bonding sheet of the excellent performance of dust tightness.From from the viewpoint of the effect being more suitable for.(M/ D)/(P×10^-3) value be preferably more than 90, more preferably more than 120, more preferably more than 150, can for 170 with On.(M/D)/(P×10^-3) the upper limit of value be not particularly limited, obtain the viewpoints such as easiness or ease of manufacturing from material Consider, usually less than 700, be 500 the following is appropriate typically less than 300, can be less than 250.Need explanation It is that the P in above-mentioned formula is the numerical part when mean air bubble diameter of above-mentioned ball conversion is represented with the unit of [μm], and P is in itself It is dimensionless number (P in other formula recorded on this specification is also same).

On a bonding sheet for preferred embodiment, 100% modulus M [N/mm²Base material] compressed with the 25% of foaming body base material Intensity C₂₅The relation of [kPa] meets following formula：35≤M/(C₂₅×10^-3).Such bonding sheet shows good buffering to compression Property, and to the elongation strong resistance of display, even if therefore can be formed as narrow impact absorbency is also good and because narrowing is drawn The performance for rising reduces few bonding sheet.According to M/ (C₂₅×10^-3) it is more than 40 (more preferably more than 45, more preferably 50 Above, such as more than 55) bonding sheet, is capable of achieving more preferable result.M/(C₂₅×10^-3) the upper limit be not particularly limited, for example Can be less than 300 (preferably less than 200, more preferably less than 150, typically less than 100).

Bonding sheet on another preferred embodiment, 100% modulus M [N/mm²Base material] with the C of foaming body base material₂₅[kPa] With the density D [g/cm of foaming body base material³] relation meet following formula：10≤(M×D)/(C₂₅×10^-3).For such bonding It is higher by 100% modulus M for compressive strength and density for piece, therefore, it is intended to good buffering is shown to compression Property and to the elongation strong resistance of display.Even if therefore, it can to turn into for narrow impact absorbency is also good and because of narrowing The performance for causing reduces few bonding sheet.According to (M × D)/(C₂₅×10^-3) it is the bonding sheet of more than 15 (such as more than 18), can Realize more preferable result.(M×D)/(C₂₅×10^-3) the upper limit be not particularly limited, for example can be less than 50 (preferably 40 Below, typically less than 30).

The bonding sheet of another preferred embodiment on technology disclosed herein, 100% modulus M [N/mm of the bonding sheet² Base material] meet 0.50≤M × Hs with the relation of the thickness Hs [mm] of the foaming body base material for constituting the bonding sheet.Such bonding sheet Even if tending to carry out narrowing also plays good impact resistance (for example, to durability of drop impact).It is thought that because For：The value of M × Hs is that more than 0.50 bonding sheet generally shows resistance high to stretcher strain, is not likely to produce because tension causes Bond area reduction.Although being not particularly limited, from from the viewpoint of further improving the impact resistance from narrow, M The value of × Hs is preferably more than 0.60, more preferably more than 0.70 (being greater than 0.75), more preferably more than 0.80 (example Such as more than 0.90).The upper limit of the value of M × Hs is not particularly limited, and considers from viewpoints such as flexibilities, and usually 10.0 the following is suitable When, preferably less than 3.0, more preferably less than 2.0 (such as less than 1.5).

The pressing adhesive tension of bonding sheet disclosed herein is not particularly limited.One width of the bonding sheet of preferred embodiment Pressing adhesive tension during 1.0mm is more than 70N (more preferably more than 100N, more preferably more than 130N, for example, 170N More than).The gluing reliability of such bonding sheet is high, therefore preferably.

Above-mentioned pressing adhesive tension is defined as below：Using horizontal 59cm, longitudinal direction 113cm, width 1.0mm window frame shape (also referred to as For " frame-like " or referred to as " frame-shaped ") bonding sheet (typically double-sided adhesive sheet) by stainless steel (SUS) plate and glass plate 10 seconds are crimped so as to be fitted with the load of 50N, sample for evaluation are thus made, for the sample for evaluation, with 10mm/ Minute load speed portion presses above-mentioned glass plate along the thickness direction of glass plate from the inside, will until glass plate with it is stainless Steel plate separate untill in a period of the maximum stress that is observed be defined as above-mentioned pressing adhesive tension.More specifically, may be used The step of with according to described in embodiment described later, determines pressing adhesive tension.It should be noted that one side bonding sheet by moulding Viscous force is pasted on glass plate by by adhesive surface, using the face without adhesive phase by that as the method beyond bonding and can obtain Method to sufficient adhesive strength is fixed on SUS plates so as to be measured.

It should be noted that in the following description, transverse direction 59mm, longitudinal direction 113mm, width 1.0mm will be so used sometimes Window frame shape bonding sheet determine pressing adhesive tension be expressed as " pressing adhesive tension during width 1.0mm " or " pressing adhesive tension (1.0mm width) ".Similarly, will be surveyed using the window frame shape double-sided adhesive sheet of transverse direction 59mm, longitudinal direction 113mm, width Amm sometimes Fixed pressing adhesive tension is stated as " pressing adhesive tension during width Amm " or " pressing adhesive tension (Amm width) ".Pressing adhesive tension (Amm width) in addition to using transverse direction 59mm, longitudinal direction 113mm, the window frame shape bonding sheet of width Amm, can with by moulding Viscous force (1.0mm width) identical mode is measured.

On a bonding sheet for preferred embodiment, pressing adhesive tension S during by width 1.0mm_1.0[N] is set to 100%, then Pressing adhesive tension S during width 0.3mm_0.3[N] is S_1.0More than 27%.That is, S_0.3/S_1.0It is more than 27%.More preferably S_0.3/ S_1.0It is more than 30% (being greater than 30%).S_0.3/S_1.0Value it is more preferred closer to 100%, therefore its upper limit do not limit especially Make, usually less than 50%, typically less than 40%.

It should be noted that above-mentioned S_0.3It is pressing adhesive tension when width 0.3mm is represented with the unit of [N] (newton) Numerical value, S_0.3This is as dimensionless number.For S_1.0With S described later_0.5、S_0.7It is also same.

Bonding sheet on another preferred embodiment, pressing adhesive tension S during by width 1.0mm_1.0[N] is set to 100%, Then pressing adhesive tension S during width 0.5mm_0.5[N] is S_1.0More than 50%, more preferably higher than 50% (such as 52% with On).S_0.5/S_1.0Value it is more preferred closer to 100%, therefore its upper limit is not particularly limited, usually less than 70%, typically It is less than 60%.

In this way, pressed in the contrast of the reduction ratio of width the reduction ratio of adhesive tension for below equal (preferably Less than 1.1 times, more preferably less than 1.0 times, be, for example, less than 1.0 times) bonding sheet because the pressing along with narrowing is gluing The reduction of power is few, thus, for example part (typically width of the width less than 1.0mm suitably can be had with least a portion Linear parts less than 1.0mm) the form of engagement member use.

In addition, referring to less (special corresponding to the variation of width along with the reduction of the pressing adhesive tension of the narrowing of bonding sheet Be not width for below 1mm scope in variation) pressing adhesive tension variation it is few.Such bonding sheet preferably with At least a portion have the width of linear parts and above-mentioned linear parts a part from the different engagement structure of other parts The form of part is used.For the bonding sheet as described above with the different part of width, (particularly above-mentioned linear parts are at least Engagement member of the width of a part less than 1.0mm) for, the bond properties caused by the difference of width (is for example pressed gluing Power) difference it is excessive when, strain concentrate on the part that width changes, the part be likely to become bonding sheet stripping, hair The starting point of the damage of foam base material.Corresponding to the variation of width pressing adhesive tension equable bonding sheet due to being not likely to produce Above-mentioned stripping, damage, therefore the bonding sheet of excellent impact resistance can be turned into.

Although being not particularly limited, bonding sheet disclosed herein preferably meets at least one of following conditions：

Pressing adhesive tension (0.7mm width) is more than 50N (more preferably more than 70N, more preferably more than 90N, example Such as more than 120N)；

Pressing adhesive tension (0.5mm width) is more than 35N (more preferably more than 50N, more preferably more than 65N, example Such as more than 85N)；And

Pressing adhesive tension (0.3mm width) is more than 20N (more preferably more than 30N, more preferably more than 40N, example Such as more than 50N).Such bonding sheet can turn into gluing bonding sheet of excellent in reliability, being also suitable for narrowing.

Bonding sheet disclosed herein can be the bonding sheet with desired optical characteristics (transmissivity, reflectivity etc.). For example, being more than 0% and less than 15% (more preferably more than 0% for the preferred transmission of visible light of bonding sheet of shading purposes And less than 10%).In addition, being more than 20% and less than 100% for the preferred visible reflectance of bonding sheet of light reflection purposes (more preferably more than 25% and less than 100%).The optical characteristics of bonding sheet for example can be by as described above to foaming body base Material colour etc. adjusting.

From preventing the viewpoints such as metal erosion from considering, bonding sheet disclosed herein is preferably Halogen.Bonding sheet is Halogen For example in the case of the fixation that the bonding sheet can be used for electrical and electronic parts, favourable feature can be turned into.In addition, can press down The generation of halogen-containing gas during system burning, therefore, it is also preferred from from the viewpoint of mitigating carrying capacity of environment.The bonding of Halogen Piece can be obtained by independent or following means of appropriately combined use etc.：Halogen compounds is not used intentionally as foaming body base The raw material of material or adhesive, using intentionally mismatching the foaming body base material of halogen compounds, use in the case of additive not Use the additive from halogen compounds.

The pasted objects thing (adherend) of bonding sheet disclosed herein is not particularly limited.Bonding sheet disclosed herein is for example Can be being pasted on comprising metal materials such as stainless steel (SUS), aluminium；The inorganic material such as glass, ceramics；It is makrolon (PC), poly- Methyl methacrylate (PMMA), polypropylene, polyethylene terephthalate (PET), acronitrile-butadiene-styrene copolymerization The resin materials such as resin (ABS), impact resistant polystyrene (HIPS), PC-ABS blending resins, PC-HIPS blending resins； The elastomeric materials such as natural rubber, butyl rubber；And the mode of the adherend of their composite etc. is used.

Bonding sheet disclosed herein is few due to the performance reduction caused by narrowing, therefore can turn into and be suitable as strong The bonding sheet used for the purpose such as engagement, fixed in the strong portable equipment for requiring narrowing.In addition, bonding disclosed herein Piece includes foaming body base material, therefore can turn into the excellent bonding sheets such as impact absorbency, water proofing property, dust tightness.Using so Feature, be preferably applied to electronics applications, the display part of such as mancarried electronic aid fix use, mancarried electronic aid Display part protection component fixes use, the key-press module component of mobile phone fixes use, the decoration panel of television set fixes use, PC Battery pack fix use, the camera lens waterproof of DV with etc. purposes.As particularly preferred purposes, portable electricity can be enumerated Sub- equipment purposes.Particularly preferably it is used for the mancarried electronic aid with liquid crystal display device.For example, being suitable for such Display part (can be the display part of liquid crystal display device) or display part protection component are engaged with housing in mancarried electronic aid Purposes etc..

It should be noted that above-mentioned display part protection component is typically the area with display transparent in a thickness direction The component (hereinafter also referred to " light-transmitting member ") in domain, also sometimes referred to as lens.Here, " lens " are bags in this manual The lens for including the refraction action of display light and the concept for not showing both lens of refraction action of light.That is, in this specification Also the guarantor of the display part of mancarried electronic aid is merely protected in " lens " including the light-transmitting member without refraction action, for example Protection slab etc..Above-mentioned protection panels can also be managed as display part protection component or display part cover component with translucency Solution.In the case where the material of above-mentioned protection panels is for glass, the protection panels are alternatively referred to as " protective glass ".But, it is above-mentioned The material of protection panels or said lens is not limited to glass, as long as being the material of display transparent.

In addition, in this manual, mancarried electronic aid refers to the general electronic equipment for carrying and using, and is not had in addition There is especially limitation.Here, so-called " portable ", it is insufficient to be merely capable of carrying, and refers to have personal (normal adult) energy The portability of enough levels relatively easily carried.The example of " mancarried electronic aid " said here include mobile phone, Smart mobile phone, plate PC, subnotebook PC etc..Such mancarried electronic aid can be worn for so-called Wear the terminal of type (for example, the wristband type such as Wristwatch-type, glasses type etc. head-mounted etc.).Above-mentioned mancarried electronic aid for example can be tool There are the health control works such as phone, clock and watch, camera, glasses, PC and other information terminals, sphygmomanometer, sphygmometer, pedometer The mancarried electronic aid of one or more the function in tool, music player, video player, recording, video recording etc..

Bonding sheet disclosed herein can be used to be constituted portable electricity to be processed to the form of the engagement member of various profiles (such as display part or display part are protected the engagement of component and housing, are preferably with printing opacity for the engagement of the part of sub- equipment, fixation Property display part protect component (typically protection panels) and the engagement of housing).As the preferred of such engagement member Form, the mean breadth W [mm] that can enumerate the narrow width part with width less than 2.0mm and the narrow width part is less than 1.0mm The form of (below more preferably below 0.7mm, more preferably below 0.5mm, such as 0.3mm).According to disclosed herein Bonding sheet, even if in the case of the engagement member as the shape (such as frame-shaped) comprising such narrow width part, can also play Good performance (pressing adhesive tension, impact absorbency etc.).It should be noted that the mean breadth W of the narrow width part of bonding sheet [mm] can be obtained by total area of the narrow width part included with the bonding sheet divided by combined length.In the width of narrow width part In the case of constant, the width of the narrow width part is consistent with above-mentioned mean breadth.

Above-mentioned narrow width part is typically wire.Here, the concept of wire is except linear, curve-like, polyline shaped (such as L Font) etc. beyond also including the ring-type such as frame-shaped or round shape, their compound shape or intermediate shape.So-called above-mentioned ring-type, is not Be limited to the ring-type being made up of curve, also including for example such as along quadrangle periphery shape (frame-shaped), the periphery along fan Shape like that part or all be formed as the concept of linear ring-type.The length of above-mentioned narrow width part is not particularly limited. For example, in the length of above-mentioned narrow width part is for the form of more than 10mm (typically more than more than 20mm, such as 30mm), can fit When the effect for playing application technology disclosed herein.The width of above-mentioned narrow width part can be with constant, it is also possible to partly different.

Bonding sheet disclosed herein is according to the 100% modulus M [N/mm with the bonding sheet²Base material] and foaming body base material The relation of thickness Hs [mm], is the shape profit of more than 0.4/ (M × Hs) preferably with the mean breadth W [mm] of above-mentioned narrow width part With.According to the bonding sheet of such shape, even if it is good also impact resistance can be formed between adherend in above-mentioned narrow width part Good junction surface.Mean breadth W [mm] according to narrow width part is more than 0.5/ (M × Hs) (more preferably 0.6/ (M × Hs) More than, more than such as 0.7/ (M × Hs)) shape bonding sheet, be capable of achieving better performance (even if being held for example, can be formed Infringement water proofing property, the performance at the junction surface of dust tightness are not easy to by drop impact).

Even if bonding sheet disclosed herein also easily plays good Joint Properties, water resistance using narrowing is carried out Such speciality such as (for example, falling rear water proofing property), anti-dust performance, can be with the engagement member of the above-mentioned ring-type with narrow width part Form, be suitably used as example by the display part of mancarried electronic aid or display part protection component it is fluid tight with housing engage So as to protect the electronic equipment being contained in the housing from water, the fixing component of dust.Therefore, according to this specification, there is provided It is comprising any one bonding sheet disclosed herein, for by the display part of mancarried electronic aid or display part protection component be fixed on The fixing component of housing.Above-mentioned fixing component flat shape typically annular in shape.The annular of the fixing component of such ring-type Shape is not particularly limited, for example can be rectangle (frame-shaped), circle, rectangle beyond polygon (such as triangle), other not Regular shape etc..In addition, except comprising a piece of sheet material and ring-type (that is, the seamless that closes completely in the concept of above-mentioned ring-type Ring-type) beyond, may also comprise：The shape of close ring can be formed by making the end of a piece of sheet material or plurality of sheets be overlapped with end Shape, configured in the mode for causing the end of blocks of material or plurality of sheets close with end and closely configured above-mentioned as needed Position carry out sealing so as to the shape of close ring can be formed.It should be noted that here, close concept include contact (away from From the state for zero), for example, mutual distance is 0mm~10mm (typically 0.1mm~10mm), is preferably 0mm~5mm (typically 0.1mm~5mm), more preferably 0mm~2mm (typically 0.1mm~2mm), more preferably 0mm~ 1mm (typically 0.1mm~1mm).As by the position of above-mentioned coincidence, the side sealed close to the position of (such as contact) Method, can be using the method clogged using encapsulants such as adhesive, the method that end is carried out into welding (such as thermal welding) each other Deng.

In addition, bonding sheet disclosed herein is using the variation (in the scope of particularly below width 1mm corresponding to width Change) bond properties (for example pressing adhesive tension) the few such speciality of variation, can preferably as continuously possessing tool Have the W1 parts of the first width and the shape (typically ring-type) of W2 parts with the second width more than first width, And form of above-mentioned first width less than 1mm is used as engagement member as described above (for example, for showing mancarried electronic aid Show that portion or display part protection component are fixed on the fixing component of housing).Such engagement member causes what is changed in width Partly the concentration of the strain of (change of W1 parts and W2 parts) is relaxed, therefore, it is not susceptible to the part as starting point The stripping of bonding sheet, the damage of foaming body base material.Therefore, the bonding sheet of excellent impact resistance can be formed.

It should be noted that in the item by this disclosure, including the description below.

(1) a kind of bonding sheet, it is the bonding sheet for having adhesive phase at least one face of foaming body base material, wherein,

100% modulus M [N/mm of above-mentioned bonding sheet²Base material] density D [g/cm with above-mentioned foaming body base material³] relation Meet 9.0≤(M/D).

(2) a kind of bonding sheet, it is the bonding sheet for having adhesive phase at least one face of foaming body base material, wherein,

100% modulus M [N/mm of above-mentioned bonding sheet²Base material] with constitute the bonding sheet foaming body base material thickness Hs The relation of [mm] meets 0.75<M×Hs.

(3) bonding sheet as described above described in (1) or (2), wherein, 100% modulus M of above-mentioned bonding sheet is higher than 4.0N/mm² Base material.

(4) bonding sheet as described above any one of (1)~(3), wherein, the thickness Hs of above-mentioned foaming body base material is 0.10mm~0.30mm.

(5) bonding sheet as described above any one of (1)~(4), wherein, the transmission of visible light of above-mentioned bonding sheet is More than 0% and less than 15%.

(6) bonding sheet as described above any one of (1)~(5), wherein, above-mentioned foaming body base material is colored as black Color.

(7) bonding sheet as described above any one of (1)~(6), wherein, above-mentioned foaming body base material is sent out for TPO Foam base material.

(8) bonding sheet as described above any one of (1)~(7), wherein, above-mentioned foaming body base material is sent out for polyethylene kind Foam base material.

(9) bonding sheet as described above any one of (1)~(8), it has with above-mentioned the two-sided of foaming body base material The form of the double-sided adhesive sheet of adhesive phase is constituted.

(10) bonding sheet as described above any one of (1)~(9), wherein, the thickness of above-mentioned adhesive phase is 20 μm ~80 μm.

(11) bonding sheet as described above any one of (1)~(10), wherein, the gross thickness Ht of above-mentioned bonding sheet is 0.10mm~0.35mm (such as 0.15mm~0.35mm).

(12) bonding sheet as described above any one of (1)~(11), wherein, the thickness Hs of above-mentioned foaming body base material [mm] shared in the gross thickness Ht [mm] of above-mentioned bonding sheet ratio is 30%~70%.

(13) bonding sheet as described above any one of (1)~(12), wherein, above-mentioned adhesive phase is with acrylic compounds The adhesive phase of polymer based on polymer.

(14) bonding sheet as described above any one of (1)~(13), wherein, above-mentioned adhesive phase is with acrylic compounds The adhesive phase of polymer based on polymer, and

The Tg of aforesaid propylene acids polymers is less than -40 DEG C.

(15) bonding sheet as described above any one of (1)~(14), wherein, above-mentioned adhesive phase is with acrylic compounds The adhesive phase of polymer based on polymer, and

In the total amount of the monomer used in the synthesis of aforesaid propylene acids polymers, the Tg of homopolymers is less than -45 DEG C Ratio shared by monomer is more than 70 weight % (preferably more than 85 weight %).

(16) bonding sheet as described above any one of (1)~(15), wherein, above-mentioned adhesive phase is with acrylic compounds The adhesive phase of polymer based on polymer, and

0.2 weight %~8 weight % is containing carboxylic in the total amount of the monomer used in the synthesis of aforesaid propylene acids polymers Base monomer.

(17) bonding sheet as described above any one of (1)~(16), wherein, above-mentioned adhesive phase is relative to the bonding The weight portion of base polymer 100 of oxidant layer contains the tackifying resin of 20~80 weight portions.

(18) bonding sheet as described above any one of (1)~(17), wherein, above-mentioned adhesive phase is relative to the bonding The softening point that the weight portion of base polymer 100 of oxidant layer contains 20~60 weight portions is more than 120 DEG C of tackifying resin.

(19) bonding sheet as described above any one of (1)~(18), wherein, above-mentioned adhesive phase passes through isocyanates Class crosslinking agent is crosslinked.

(20) bonding sheet as described above any one of (1)~(19), wherein, pressing adhesive tension during width 1.0mm S_1.0Pressing adhesive tension S when [N] is with width 0.3mm_0.3The relation of [N] meets following formula：0.3≤S_0.3/S_1.0。

(21) a kind of bonding sheet, it is the bonding sheet with adhesive phase at least one face of foaming body base material, its In,

Above-mentioned bonding sheet is constituted in the form of the two-sided double-sided adhesive sheet with adhesive phase in above-mentioned foaming body base material,

Above-mentioned foaming body base material is polyethylene kind foaming body base material,

Above-mentioned adhesive phase is the adhesive phase of the polymer based on acrylic polymer, and aforesaid propylene acids gathers 85 weight % in the total amount of the monomer used in the synthesis of compound above is the Tg of homopolymers is less than -45 DEG C of monomer,

Above-mentioned adhesive phase contains the tackifying resin of 20~80 weight portions relative to the weight portion of above-mentioned base polymer 100,

The thickness Hs of above-mentioned foaming body base material is 0.06mm~0.30mm (such as 0.10mm~0.30mm),

The gross thickness Ht of above-mentioned bonding sheet is 0.10mm~0.35mm (such as 0.15mm~0.35mm), and

(22) a kind of bonding sheet, it is the bonding sheet with adhesive phase at least one face of foaming body base material, its In,

The gross thickness Ht of above-mentioned bonding sheet is 0.15mm~0.35mm, and

(23) bonding sheet as described above any one of (1)~(22), its part for being used to engage mancarried electronic aid.

Embodiment

Hereinafter, some embodiments of the present invention are illustrated, but is not intended to limit the invention to the example shown in embodiment. It should be noted that in the following description, " part " and " % " is then if not otherwise specified weight basis.

(example 1)

To in the reaction vessel for possessing agitator, reflux condenser, thermometer, Dropping feeder and nitrogen introducing tube, put into 2.9 parts of acrylic acid, 5 parts of vinyl acetate, 92 parts of n-butyl acrylate, 0.1 part of acrylic acid 2- hydroxy methacrylates and conduct polymerization are molten 120 parts of 30 parts of the ethyl acetate of agent, toluene, stirs 2 hours while nitrogen is imported.

The oxygen in polymerization system is removed in this way, is subsequently adding 2,2 '-azodiisobutyronitrile (AIBN) 0.2 Part, it is warming up to 60 DEG C and carries out 6 hours polymerisations, so as to has obtained the polymer solution containing polymer.The polymer is molten The solid component content of liquid is 40.0%, and the Mw of polymer is 50 × 10⁴。

In above-mentioned polymer solution, relative to the polymer waste river chemical industry of 100 parts of additions in the polymer solution 10 parts of the trade name " Pensel D-125 " (rosin tackifying resin, solid component content 100%) of Co., Ltd.'s manufacture, waste river Trade name " Super Ester A-100 " (rosin tackifying resin, solid component content of chemical industry Co., Ltd. manufacture 100%) 10 parts, trade name " Foralyn 8020F " (rosin tackifying resin, solid constituent of Eastman Chemical Company's manufacture Content 100%) 5 parts and Arakawa Chemical Industries, Ltd.'s manufacture trade name " Tamanol 803L " (terpene phenol resin, solid Component content 100%) 15 parts, it is sufficiently stirred for until dissolving.Additionally, with relative to the polymer 100 in above-mentioned polymer solution Part is 2.0 parts of ratio, is added as aromatic polyisocyanate (trade name " Coronate L ", the Japanese poly- ammonia of crosslinking agent The manufacture of ester Industrial Co., Ltd, solid component content 75%), and be sufficiently stirred for, so as to obtain solvent type adhesive group Compound.

Prepare the commercially available release liner of two panels (trade name " SLB-80W3D ", the firmly manufacture of change processing paper Co., Ltd.).Will be upper State adhesive composition coat on the respective face (release surface) of these release liners cause dried thickness be 50 μm, And dried 2 minutes at 100 DEG C, thus form respectively adhesive phase in the release surface of above-mentioned two panels release liner.By this A little adhesive phases fit in respectively implement Corona discharge Treatment to two-sided polyethylene kind foam sheet (thickness 0.15mm, Density 0.56g/cm³, 10% compressive strength (C₁₀) 167kPa, 25% compressive strength (C₂₅) 468kPa, 30% compressive strength (C₃₀) 55 μm of 627kPa, mean air bubble diameter；Two sides hereinafter referred to as " base material 1A ").Above-mentioned release liner stays in adhesive phase as former state On, the surface (adhesive surface) for protecting the adhesive phase.Structure obtained by making by 80 DEG C of laminating machine (0.3MPa, Speed 0.5m/ minutes) once, then conserved one day in 50 DEG C of baking oven.The both-sided adhesive of example 1 has been obtained in this way Piece.

(example 2)

Use to two-sided polyethylene kind foam sheet (thickness 0.15mm, the density for implementing Corona discharge Treatment 0.56g/cm³, 10% compressive strength (C₁₀) 100kPa, 25% compressive strength (C₂₅) 365kPa, 30% compressive strength (C₃₀) 155 μm of 515kPa, mean air bubble diameter；Hereinafter referred to as " base material 1B ") replace base material 1A, in addition, with side same as Example 1 Formula has obtained the double-sided adhesive sheet of example 2.

(example 3)

Use to two-sided polyethylene kind foam sheet (thickness 0.15mm, the density for implementing Corona discharge Treatment 0.37g/cm³, 10% compressive strength (C₁₀) 34kPa, 25% compressive strength (C₂₅) 92kPa, 30% compressive strength (C₃₀) 90 μm of 117kPa, mean air bubble diameter；Hereinafter referred to as " base material 2A ") replace base material 1A, in addition, with side same as Example 1 Formula has obtained the double-sided adhesive sheet of example 3.

(example 4)

Use to two-sided polyethylene kind foam sheet (thickness 0.20mm, the density for implementing Corona discharge Treatment 0.20g/cm³, 10% compressive strength (C₁₀) 19kPa, 25% compressive strength (C₂₅) 47kPa, 30% compressive strength (C₃₀)59kPa、 90 μm of mean air bubble diameter；Hereinafter referred to as " base material 3A ") replace base material 1A, in addition, obtained in mode same as Example 1 The double-sided adhesive sheet of example 4.

(example 5)

Use to two-sided polyethylene kind foam sheet (thickness 0.08mm, the density for implementing Corona discharge Treatment 0.56g/cm³, 10% compressive strength (C₁₀) 148kPa, 25% compressive strength (C₂₅) 448kPa, 30% compressive strength (C₃₀) 55 μm of 617kPa, mean air bubble diameter；Hereinafter referred to as " base material 4A ") replace base material 1A, and the double of base material 4A will be fitted in The thickness of the adhesive phase in face is set as 35 μm, in addition, the both-sided adhesive of example 5 has been obtained in mode same as Example 1 Piece.

For the double-sided adhesive sheet (the bonding sheet blank (former anti-) of fixing component making) of each example, surveyed using the above method MD modulus and TD modulus are determined, result is：The MD modulus of example 1 is 6.5N/mm²Base material, TD modulus are 6.2N/mm²Base material；Example 2 MD modulus is 5.6N/mm²Base material, TD modulus are 4.5N/mm²Base material；The MD modulus of example 3 is 4.5N/mm²Base material, TD modulus are 6.5N/mm²Base material；The MD modulus of example 4 is 6.1N/mm²Base material, TD modulus are 3.1N/mm²Base material；The MD modulus of example 5 is 6.4N/ mm²Base material, TD modulus are 6.2N/mm²Base material.100% modulus M [N/mm of the bonding sheet of each example that will be obtained by these values²Base Material], the result of M/D and M × Hs is shown in Table 1.

Table 1

	Example 1	Example 2	Example 3	Example 4	Example 5
						Thickness Hs [mm]	0.15	0.15	0.15	0.20	0.08
Density D [g/cm³]	0.56	0.56	0.37	0.20	0.56
						100% modulus M [N/mm²Base material]	6.4	5.0	5.5	4.6	6.2
M/D	11.4	8.9	14.9	23.0	11.1
						M×Hs	0.96	0.75	0.83	0.92	0.50

Double-sided adhesive sheet is cut into the window frame shape (frame of horizontal 59mm as shown in Figure 2, longitudinal direction 113mm, width 1.0mm Rack-like), so as to obtain window frame shape double-sided adhesive sheet.Using the window frame shape double-sided adhesive sheet, by horizontal 59mm, longitudinal direction 113mm, Glass plate (the Gorilla glass manufactured using Corning Incorporated of thickness 1mm；It is same as below) and there is diameter in central portion The stainless steel plate (SUS plates) (horizontal 70mm, longitudinal direction 130mm, thickness 2mm) of the through hole of 15mm is crimped 10 seconds with the load of 50N Clock, thus fits, so as to obtain sample for evaluation.

Fig. 2 is the schematic diagram of above-mentioned sample for evaluation, and (a) is top view, (b) is its A-A ' sectional view.In fig. 2, accord with Numbers 2 expression window frame shape double-sided adhesive sheets, symbol 21 represent that SUS plates, symbol 22 represent that glass plate, symbol 21A are represented on SUS plates 21 The through hole of setting.

These sample for evaluations are arranged at universal tensile compression test (device name " Compression and Expansion testing machine, TG- 1kN " minebea Co., Lt manufactures).Then, make pole through the through hole of SUS plates, make the pole with the speed of 10mm/ minutes Degree decline, thus along with SUS plates away from direction press laminated glass.Then, determine untill glass plate is separated with SUS plates In a period of the maximum stress that observes as pressing adhesive tension.It should be noted that determining in the environment of 23 DEG C, 50%RH Carry out.

Fig. 3 is the schematic cross sectional views of the assay method for showing pressing adhesive tension, and symbol 2 represents the both-sided adhesive of window frame shape Piece, symbol 21 represent that SUS plates, symbol 22 represent that glass plate, symbol 23 represent that pole, symbol 24 represent supporting table.Evaluation sample Product are fixed on the supporting table 24 of above-mentioned testing machine as shown in Figure 3, and the glass plate 22 of sample for evaluation is through the insertion of SUS plates 21 The pole 23 of hole 21A is pressed.It should be noted that in above-mentioned pressing adhesive tension measure, SUS plates 21 are without because by using circle Load that rod 23 is applied by laminated glass 22 and bend or damaged.

The width of above-mentioned window frame shape bonding sheet is changed to 0.7mm, 0.5mm and 0.3mm, in addition, with above-mentioned phase Same mode produces sample for evaluation, and has carried out pressing adhesive tension measure in an identical manner.

Resulting result is shown in Table 2."-" in table is represented not to be evaluated.

Table 2

As shown in table 2, the bonding sheet and the bonding sheet of the example 2 for having used base material B1 to the example 1 using base material A1 are carried out When comparing, the conservation rate (S of the pressing adhesive tension in the case of example 1 during width 0.5mm_0.5/S_1.0) high, during for width 0.3mm Pressing adhesive tension conservation rate (S_0.3/S_1.0) for example 1 superiority it is more significantly.The result is that, although during width 1.0mm Pressing adhesive tension in example 1 and example 2 be same degree, but width 0.5mm pressing adhesive tension example 1 bonding sheet situation Under be higher by about 10%, the pressing adhesive tension of width 0.3mm is higher by more than 20% in the case of example 1.It should be noted that for The commercially available bonding sheet without foaming body base material comprising acrylic adhesive layer, to the pressing under above-mentioned each sample width Adhesive tension is similarly measured, and (S is calculated by its result_0.5/S_1.0) and (S_0.3/S_1.0), as a result (S_0.5/S_1.0) for 46%, (S_0.3/S_1.0) it is 20%.

Double-sided adhesive sheet is cut into the window of horizontal 59mm as shown in Fig. 4 (a), (b), longitudinal direction 113mm, width 1.0mm Frame-shaped (frame-like), so as to obtain window frame shape double-sided adhesive sheet.Using the window frame shape double-sided adhesive sheet, by polycarbonate plate (horizontal 70mm, longitudinal direction 130mm, thickness 2mm) is with glass plate (horizontal 59mm, longitudinal direction 113mm, thickness 0.5mm) with the load of 50N Crimping 10 seconds, thus fits, so as to obtain sample for evaluation.

Fig. 4 (a), (b) are the schematic diagram of above-mentioned sample for evaluation, and (a) is top view, (b) is its B-B ' sectional view.In figure In 4, symbol 3 represents that the double-sided adhesive sheet of window frame shape, symbol 31 represent that polycarbonate plate, symbol 32 represent glass plate.

Installed at the back side (face of the face opposition side fitted with glass plate) of the polycarbonate plate of above-mentioned sample for evaluation The weight (Hammer of 160g).For the above-mentioned sample for evaluation with weight, under normal temperature (about 23 DEG C), enter to exercise it from 1.2m's Height freely falls to the shatter test of concrete slab 60 times.Now, the direction for falling is adjusted so that above-mentioned sample for evaluation Six faces are followed successively by lower section.That is, 10 circulations have been carried out for the pattern that six faces will once fall respectively.

Then, whether the engagement of polycarbonate plate and glass plate is maintained when confirming to fall each time by visual observation, will be straight Drop number to polycarbonate plate (separation) peeling-off with glass plate as normal temperature under the durability that falls commented Valency.It is evaluated as in the case where stripping is not confirmed after falling 60 times yet " more than 60 ".

The width of above-mentioned window frame shape bonding sheet is changed to 0.7mm, 0.5mm and 0.3mm, in addition, with above-mentioned phase Same mode produces sample for evaluation, and has carried out falling endurancing in an identical manner.

Based on IPX7 standards (JIS C 0920/IEC60529), (after 60 times fall) after endurancing is fallen to above-mentioned The water proofing property of sample for evaluation evaluated.That is, by the above-mentioned sample for evaluation fallen after endurancing in standard shape Immersed in the tank of depth of water 1m 30 minutes under state (23 DEG C, 50%RH), it is thus identified that whether there is and internally seep water.

Resulting result is shown in Table 3.

Dust tightness experiment has been carried out using the dust tightness evaluation experimental device shown in Fig. 5,6.Here, Fig. 5 is dust-proof to show The exploded perspective view of the schematic composition of property evaluation experimental device, Fig. 6 is the sectional view of the dust tightness evaluation experimental device.In figure 5th, in 6, symbol 120 represents that dust tightness evaluation experimental device, symbol 121 represent that top board, symbol 122 represent backing plate, the table of symbol 123 Show that punch press process represents that evaluation casing, symbol 127 represent that (length of side is for opening portion into the double-sided adhesive sheet of window frame shape, symbol 125 The square shape of 52mm), the representation space portion of symbol 128.Dust tightness evaluation experimental device 120 is by by the flat board of approximate quadrangle The top board 121 of shape can internally form the sealable space of approximate rectangular-shape with the screw threads for fastening of evaluation casing 125 Portion 128.It should be noted that opening portion of the opening portion 127 for spatial portion 128.In addition, top board 121 has as opening portion Overlook the otch of quadrangle (trapezoidal).

In the lower surface relative with opening portion 127 of top board 121, pacified in the mode relative with the entire surface of opening portion 127 The backing plate 122 of the dress quadrangle flat board shape bigger than opening portion 127.In the position relative with opening portion 127 of the lower surface of backing plate 122 Put, the double-sided adhesive sheet 123 with the window portion in approximate same size with opening portion 127 is installed.Therefore, by screw threads for fastening top board 121, double-faced adhesive tape 123 is fixed between the periphery of backing plate 122 and opening portion 127.Therefore, by by top board 121 with Evaluate and use the screw threads for fastening of casing 125, evaluation is closed by adhesive tape 123 and backing plate 122 with the spatial portion 128 in casing 125.Backing plate 122 thickness is entered according to the gross thickness of the bonding sheet of evaluation object in the way of the difference for offsetting the gross thickness of bonding sheet of each example Row selection.

From evaluation with the opening portion 127 in casing 125 to spatial portion 128 add 0.1g as dust cornstarch, every The configuration backing plate 122 of window frame shape double-faced adhesive tape 123, and top board 121 is screwed to evaluation casing 125 from it, by This is produced and accommodates above-mentioned dust (not shown) in the spatial portion 128 after being sealed using window frame shape double-faced adhesive tape 123 Dust tightness evaluation experimental device 120.The dust tightness evaluation experimental device 120 is put into drum-type shatter test device (rotatably to fall Lower device) in, it is rotated with the speed of 3rpm.Often rotating 10 times stops device and takes out dust tightness evaluation experimental device 120, whether the dust that is contained in spatial portion 128 of observation is from the sealing formed by window frame shape double-faced adhesive tape 123 by visual observation Portion spills and is attached to the outer surface of dust tightness evaluation experimental device 120, and record is until confirming the rotation untill dust adheres to Number.

It is 1mm's that the double-sided adhesive sheet of each example is punched into the opening portion with the square shape that the length of side is 52mm, width (that is, peripheral shape is the length of side for the frame-shaped of 0.5mm for frame-shaped (that is, peripheral shape is the square shape that the length of side is 54mm) or width It is the square shape of 53mm) and window frame shape double-faced adhesive tape 123 is formed, carried out using the double-faced adhesive tape 123 above-mentioned anti- Dirt is tested.In showing the result in table 3.

Table 3

As shown in table 3, in the evaluation in width 1.0mm, example 1, the bonding sheet of example 2 show it is good fall it is durable Property and fall rear water proofing property, performance difference is not found especially.On the other hand, in width 0.5mm and the situation of width 0.3mm Under, the bonding sheet of example 1 to fall durability significantly higher.In addition, in evaluation in width 0.7mm, falling durability does not have Find differences, but the bonding sheet of example 2 finds infiltration in waterproof test after falling, and shows that bonding sheet is damaged.With this phase Right, the bonding sheet of example 1 also shows that good water proofing property in the case of width 0.7mm after endurancing is fallen.In addition, The bonding sheet of example 5 shows in the same manner as the bonding sheet of example 1 good after falling durability and falling in more than width 0.5mm Water proofing property, also shows that height falls durability in the case of width 0.3mm compared with the bonding sheet of example 2.In addition, example 1,5 The dust tightness of bonding sheet is in width 1.0mm and width 0.5mm better than bonding sheets of example 2 in the case of any one.

It is adjoint for the bonding sheet of example 1 and example 5 compared with the bonding sheet of example 2 it can be seen from above-mentioned evaluation result The performance reduction for narrowing is few.The difference for falling rear water proofing property during for width 0.7mm, it is believed that the bonding sheet of example 1 and example 5 The foaming body base material this point for having used mean air bubble diameter small compared with the bonding sheet of example 2 advantageously plays a role.Need It is bright, on (M/D)/(P × 10 obtained in the form of ratio of the value of M/D relative to mean air bubble diameter P [μm]^-3) Value, in example 1 for 207.8, in example 2 in 57.6, example 3 in 165.2, example 4 to be 201.3 in 255.6, example 5.

More than, concrete example of the invention is illustrated in detail, but these examples are only to illustrate, not to right Claim is limited.Technology described in claims includes carrying out foregoing illustrative concrete example various modifications, becomes Technology obtained from more.

Reference

1 double-sided adhesive sheet

11 first adhesive phases

The adhesive surfaces of 11A first

12 second adhesive phases

The adhesive surfaces of 12A second

15 foaming body base materials

The faces of 15A first

The faces of 15B second

17 release liners

The front of 17A release liners

The back side of 17B release liners

2 double-sided adhesive sheets

21 stainless steel plates

21A through holes

22 glass plates

23 poles

24 supporting tables

3 double-sided adhesive sheets

31 polycarbonate plates

32 glass plates

120 dust tightness evaluation experimental devices

121 top boards

122 backing plates

123 double-sided adhesive sheets

125 evaluation casings

127 opening portions

128 spatial portions

Claims

1. a kind of bonding sheet, it is the bonding sheet with adhesive phase at least one face of foaming body base material, wherein,

100% modulus M [N/mm of the bonding sheet²Base material] density D [g/cm with the foaming body base material³] relation meet 9.0≤(M/D)。

2. bonding sheet as claimed in claim 1, wherein, 100% modulus M of the bonding sheet is higher than 4.0N/mm²Base material.

3. bonding sheet as claimed in claim 1 or 2, wherein, the thickness Hs of the foaming body base material is 0.06mm~0.30mm.

4. bonding sheet as claimed in claim 1 or 2, wherein, the thickness Hs of the foaming body base material is 0.10mm~0.30mm.

5. the bonding sheet as any one of Claims 1 to 4, wherein, the thickness of described adhesive layer is 20 μm~80 μm.

6. the bonding sheet as any one of Claims 1 to 5, wherein, pressing adhesive tension S during width 1.0mm_1.0[N] with Pressing adhesive tension S during width 0.3mm_0.3The relation of [N] meets following formula：0.3≤S_0.3/S_1.0。

7. the bonding sheet as any one of claim 1~6, it is with the two-sided with adhesive of the foaming body base material The form of the double-sided adhesive sheet of layer is constituted.

8. the bonding sheet as any one of claim 1~7, wherein, the gross thickness Ht of the bonding sheet for 0.10mm~ 0.35mm。

9. the bonding sheet as any one of claim 1~8, wherein, the thickness Hs [mm] of the foaming body base material is in institute It is 30%~70% to state shared ratio in the gross thickness Ht [mm] of bonding sheet.

10. the bonding sheet as any one of claim 1~9, wherein, the foaming body base material is TPO foaming body Base material.

11. bonding sheets as claimed in claim 10, wherein, the foaming body base material is polyethylene kind foaming body base material.

12. bonding sheet as any one of claim 1~11, wherein, the foaming body base material is colored as black.

13. bonding sheet as any one of claim 1~12, wherein, the transmission of visible light of the bonding sheet is 0% Above and less than 15%.

14. bonding sheet as any one of claim 1~13, wherein, described adhesive layer is with acrylic The adhesive phase of polymer based on thing.

15. bonding sheets as claimed in claim 14, wherein, the glass transition temperature of the acrylic polymer is -40 Below DEG C.

16. bonding sheet as described in claims 14 or 15, wherein, the monomer used in the synthesis of the acrylic polymer Total amount in, the glass transition temperature of homopolymers is that the ratio shared by less than -45 DEG C of monomer is more than 70 weight %.

17. bonding sheet as any one of claim 14~16, wherein, make in the synthesis of the acrylic polymer 0.2 weight %~8 weight % is carboxyl group-containing monomer in the total amount of monomer.

18. bonding sheet as any one of claim 1~17, wherein, described adhesive layer is relative to the adhesive phase The weight portion of base polymer 100 contain the tackifying resin of 20~80 weight portions.

19. bonding sheet as any one of claim 1~18, wherein, described adhesive layer is relative to the adhesive phase The weight portion of base polymer 100 softening point that contains 20~60 weight portions be more than 120 DEG C of tackifying resin.

20. bonding sheet as any one of claim 1~19, wherein, described adhesive layer is handed over by isocyanates Connection agent is crosslinked.

A kind of 21. bonding sheets, it is the bonding sheet with adhesive phase at least one face of foaming body base material, wherein,

The bonding sheet is constituted in the form of the two-sided double-sided adhesive sheet with adhesive phase in the foaming body base material,

The foaming body base material is polyethylene kind foaming body base material,

Described adhesive layer is the adhesive phase of the polymer based on acrylic polymer, the acrylic polymer Synthesis in the total amount of monomer that uses 85 weight % above is the Tg of homopolymers is less than -45 DEG C of monomer,

Described adhesive layer contains the tackifying resin of 20~80 weight portions relative to the weight portion of the base polymer 100,

The thickness Hs of the foaming body base material is 0.06mm~0.30mm,

The gross thickness Ht of the bonding sheet is 0.10mm~0.35mm, and

22. bonding sheet as any one of claim 1~21, its part for being used to engage mancarried electronic aid.