CN1504070A - Method for mounting electronic part on flexible printed wiring board and adhesive sheet for fixing flexible printed wiring board - Google Patents

Method for mounting electronic part on flexible printed wiring board and adhesive sheet for fixing flexible printed wiring board Download PDF

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Publication number
CN1504070A
CN1504070A CNA02808439XA CN02808439A CN1504070A CN 1504070 A CN1504070 A CN 1504070A CN A02808439X A CNA02808439X A CN A02808439XA CN 02808439 A CN02808439 A CN 02808439A CN 1504070 A CN1504070 A CN 1504070A
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CN
China
Prior art keywords
pressure
sensitive adhesive
adhesive sheet
formation
fpc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA02808439XA
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Chinese (zh)
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CN100341391C (en
Inventor
牟田茂树
雅
田中和雅
志
佐野建志
史
山本浩史
一
池田功一
二
横山纯二
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
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Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001119430A external-priority patent/JP2002309201A/en
Priority claimed from JP2001119431A external-priority patent/JP2002314240A/en
Priority claimed from JP2001151846A external-priority patent/JP2002338914A/en
Priority claimed from JP2001151850A external-priority patent/JP2002338915A/en
Priority claimed from JP2001151853A external-priority patent/JP4766776B2/en
Priority claimed from JP2001176838A external-priority patent/JP2002368497A/en
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of CN1504070A publication Critical patent/CN1504070A/en
Application granted granted Critical
Publication of CN100341391C publication Critical patent/CN100341391C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
    • H05K13/04—Mounting of components, e.g. of leadless components
    • H05K13/046—Surface mounting
    • H05K13/0469—Surface mounting by applying a glue or viscous material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/007—Manufacture or processing of a substrate for a printed circuit board supported by a temporary or sacrificial carrier
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0393—Flexible materials
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/01—Tools for processing; Objects used during processing
    • H05K2203/0147—Carriers and holders
    • H05K2203/0156—Temporary polymeric carrier or foil, e.g. for processing or transferring
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/01—Tools for processing; Objects used during processing
    • H05K2203/0191—Using tape or non-metallic foil in a process, e.g. during filling of a hole with conductive paste

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Structure Of Printed Boards (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

A flexible printed wiring board (4) is fixed to a pressure-sensitive adhesive layer of a fixing sheet (6), and an electronic part is mounted on the flexible printed wiring board (4). Alternatively, an adhesive sheet (5) is bonded to the opposite side to the side, where an electronic part is to be mounted, of the flexible printed wiring board (4), the flexible printed wiring board is fixed to the fixing sheet (6) through the adhesive sheet (5), and an electronic is mounted on the flexible printed wiring board (4). The adhesive sheet (5) for fixing the flexible printed wiring board (4) to the fixing sheet (6) has a pressure-sensitive layer at least on one side of its porous base. The storage elastic modulus (frequency : 1 Hz) of the pressure-sensitive adhesive layer lies in a range of 10<sp>3</sp> to 10<sp>6</sp> Pa at 0 to 300 [deg.] C. Projections or dents can be formed on or in the pressure-sensitive adhesive layer.

Description

The method of electronic unit is installed on flexible print circuit and is used for fixing the adhesive sheet of flexible print circuit
Technical field
The present invention relates to a kind of electronic unit is fixed on method on the flexible print circuit (hereinafter being sometimes referred to as " FPC "), by this method, FPC can easily be fixed on the fixed head when electronic unit is installed on the FPC, and electronic unit can high accuracy automatically be installed.In addition, the invention still further relates to a kind of adhesive sheet, by this adhesive sheet, FPC can easily be bonded on the fixed head and easily and peel off from fixed head, and in this adhesive sheet, even the heating adhesive sheet also can suppress or prevent the reduction of its viscosity when being installed in electronic unit on the FPC.
Background technology
In the prior art, when the preparation electronic circuit board, various electronic units (as IC and capacitor) can utilize fitting machine [for example, Panasert (Matsushita Electric Industrial Co., Ltd.) make] automatically be installed on the rigid plate (glass plate, epoxy resin board etc.).In these class methods, the positional accuracy of rigid plate was important when electronic unit was installed.Therefore, rigid plate generally is to be clipped between the guide rail to transmit, so that do not produce mobile.
On the other hand, in recent years, along with electronics miniaturization and light-weighted development, electronic unit can directly be installed (mounted on surface) surface at flexible print circuit (FPC).FPC itself (wiring board) is not firm.Therefore, when using FPC, even it is clipped between the guide rail, FPC can not strictly fix.Thereby the positional accuracy of FPC is low.Just because of this, FPC need be fixed on the fixed head, and then electronic unit is installed on the FPC, for example the method shown in Figure 13 A and the 13B.Figure 13 A and 13B are the fixing schematic diagrames of the representative instance of the method for FPC in the prior art.In the method shown in Figure 13 A and the 13B, FPC4 is installed on the surface of motherboard 6 (as the fixed head of aluminum), and the hole 72a that making FPC arrange provides among pilot pin 72 and the FPC 4 matches.Utilize the adhesive tape 9 (adhesive tape that uses in the prior art then, for example use polyimide film or fluororesin base film to be base material, and form the adhesive tape of formation of pressure-sensitive adhesive layer in base material one side) FPC 4 is fixed on the motherboard 6, it is bonded in 2 to 4 positions of each FPC 4 from top to bottom.Subsequently, with the hole 71a pairing that provides in the motherboard of fixing pilot pin 71 and the motherboard 6, so that motherboard 6 is fixed on the fixed station 8 that is used to transmit.Then motherboard 6 is clipped between the guide rail.Like this, electronic unit can be installed on the FPC 4.
Yet as in the method for the installation electronic unit of the prior art shown in Figure 13 A and the 13B, each FPC utilizes adhesive tape to be fixed on the fixed head by the fixing edge of FPC 2 to 4 positions.Therefore, the constant intensity of FPC is too low, to such an extent as to produce the gap between FPC and fixed head.As a result, when electronic unit being installed in FPC and going up, the positional accuracy of FPC, particularly go up/positional accuracy that the below makes progress is low.In addition, because narrow adhesive tape is bonded on each FPC in several positions, need a lot of work and time to adhere to or remove FPC, so machinability is low.
Therefore, the purpose of this invention is to provide and a kind of electronic unit is installed in method on the flexible print circuit (FPC), by this method, when electronic unit is installed on the FPC, FPC can easily be bonded on the fixed head or from fixed head and peel off, and FPC can be securely fixed on the fixed head simultaneously.
Another object of the present invention provides and a kind of electronic unit is fixed on method on the flexible print circuit, by this method, when electronic unit is installed on the FPC, FPC can stick on the fixed head or from fixed head with the machinability of excellence and peel off, and electronic unit can be installed on the FPC with high accuracy simultaneously.
A further object of the present invention provides a kind of adhesive sheet, by this adhesive sheet, flexible print circuit can easily be bonded on the fixed head or from fixed head and peel off, and in this adhesive sheet, even the heating adhesive sheet also can suppress or prevent the reduction of its viscosity when being installed in electronic unit on the FPC.
Summary of the invention
First invention provides a kind of electronic unit is installed in method on the flexible print circuit.In the method, when on the surface that electronic unit is installed in flexible print circuit, flexible print circuit is fixed on the surface to have on the surface of formation of pressure-sensitive adhesive layer of fixed head of formation of pressure-sensitive adhesive layer, electronic unit is installed on the surface of flexible print circuit then.
According to this first invention, the fixed head that has formation of pressure-sensitive adhesive layer as the surface, can preferably use such fixed head, the adhesive sheet that wherein at least one side has formation of pressure-sensitive adhesive layer sticks to a side of fixed head, make the formation of pressure-sensitive adhesive layer of adhesive sheet be positioned at fixed head side facing surfaces on.In addition, the formation of pressure-sensitive adhesive layer of preferred fixed head adhesion flexible print circuit comprises the pressure-sensitive adhesive with good removeability.
Second invention provides a kind of electronic unit is installed in method on the flexible print circuit.In the method, when on the surface that electronic unit is installed in flexible print circuit, adhesive sheet sticks in advance on the flexible print circuit and will install on the surperficial facing surfaces of electronic unit., by adhesive sheet flexible print circuit be fixed on fixed head on, electronic unit be installed on the surface of flexible print circuit then thereafter.
According to second invention, can preferably use formation of pressure-sensitive adhesive layer to be formed at the double-faced pressure-sensitive adhesive sheet of base material both sides.The preferred porous substrate that uses is as base material.In addition, preferably use acrylic pressure-sensitive adhesive and/or silicon resin base pressure-sensitive adhesive, as the pressure-sensitive adhesive that forms formation of pressure-sensitive adhesive layer.
The present invention also comprises a kind of flexible print circuit, it is used for electronic unit is installed in method on the flexible print circuit, and is used for that wherein flexible print circuit is fixed on adhesive sheet on the fixed head and sticks on the flexible print circuit and the surperficial facing surfaces that electronic unit will be installed.
The 3rd invention provides a kind of adhesive sheet, is used for when electronic unit is installed on the surface of flexible print circuit flexible print circuit being fixed on fixed head.Adhesive sheet comprises porous substrate, and is formed at the formation of pressure-sensitive adhesive layer of at least one side of porous substrate.
In the present invention, preferably use porous substrate that fiber material makes as porous substrate.In addition, preferably use acrylic pressure-sensitive adhesive and/or silicon resin base pressure-sensitive adhesive, as the pressure-sensitive adhesive that forms formation of pressure-sensitive adhesive layer.
The 4th invention provides a kind of adhesive sheet, is used for when electronic unit is installed on the surface of flexible print circuit flexible print circuit being fixed on fixed head.This adhesive sheet comprises base material, and formation of pressure-sensitive adhesive layer, the energy storage modulus of elasticity (frequency: 1Hz) be 10 of this formation of pressure-sensitive adhesive layer under 0-300 ℃ temperature 3-10 6Pa, and be formed at least one side of base material.
In the present invention, electronic unit tensile strength afterwards preferably is installed and is not less than 5N/15mm.In addition, preferred substrates is a porous substrate.
The 5th invention provides a kind of adhesive sheet, is used for when electronic unit is installed on the surface of flexible print circuit flexible print circuit being fixed on fixed head.Adhesive sheet has formation of pressure-sensitive adhesive layer, forms a plurality of protuberances or depressed part in formation of pressure-sensitive adhesive layer.
When forming protuberance in the surface at formation of pressure-sensitive adhesive layer, preferably this protuberance is linear protuberance.This linear protuberance can be coated with by striped and form.When forming depressed part in the surface at formation of pressure-sensitive adhesive layer, preferably this depressed part is that surface by the punching press formation of pressure-sensitive adhesive layer forms.In addition, the thermal endurance when infrared ray heats, formation of pressure-sensitive adhesive layer can be formed at fusing point and be not less than at least one side of 290 ℃ sheet or film like base material.
The present invention also comprises and a kind of electronic unit is installed in method on the flexible print circuit, after wherein the adhesive sheet of electronic unit each fixing flexible printed circuit in flexible print circuit is invented by the 3rd to the 5th is fixed on the fixed head, be installed on the surface of flexible print circuit.
Description of drawings
Figure 1A to 1C is the schematic diagram that FPC has sticked to the state on the fixed head in first embodiment, and Figure 1A is a vertical view, and Figure 1B is an end view, and Fig. 1 C shows a kind of figure of distortion;
Fig. 2 A and 2B are the schematic diagrames that FPC has sticked to the state on the fixed head in second embodiment, and Fig. 2 A is a vertical view, and Fig. 2 B is an end view;
Fig. 3 is the sectional drawing according to the example of adhesive sheet of the present invention;
Fig. 4 is the sectional drawing according to another example of adhesive sheet of the present invention;
Fig. 5 is the sectional drawing according to the another example of adhesive sheet of the present invention;
Fig. 6 is the sectional drawing of an example again according to adhesive sheet of the present invention;
Fig. 7 is the vertical view according to the adhesive sheet that is used for fixing FPC of Fig. 5 or 6;
Fig. 8 is the sectional drawing according to another example of adhesive sheet of the present invention;
Fig. 9 is the sectional drawing according to the another example of adhesive sheet of the present invention;
Figure 10 is according to the adhesive sheet of the present invention sectional drawing of an example again;
Figure 11 is the section plan view according to the adhesive sheet that is used for fixing FPC of Fig. 9 or 10;
Figure 12 is the sectional drawing according to another example of adhesive sheet of the present invention; And
Figure 13 A and 13B are the fixing schematic diagrames of the representative instance of FPC method in the prior art.
The best mode that carries out an invention
The various details embodiment, and when needed with reference to accompanying drawing.Figure 1A and 1B are the schematic diagrames that electronic unit is installed in first embodiment of the method on the FPC according to of the present invention.Particularly, Figure 1A and 1B are the schematic diagrames that FPC sticks to the state on the fixed head, and Figure 1A is a vertical view, and Figure 1B is an end view.In Figure 1A and 1B, Reference numeral 4 expression FPC; 5 expressions have the double-faced pressure-sensitive adhesive sheet of base material; The last formation of pressure-sensitive adhesive layer of 51 expression double-faced pressure-sensitive adhesive sheets 5; 6 expression fixed heads; 71 expressions are the motherboard of pilot pin (guide pin) fixedly; 72 expression FPC arrange pilot pin; 71a represents to be used for and the fixing patchhole of the motherboard pairing of pilot pin 71; 72a represents to be used for arranging with FPC the patchhole of pilot pin 72 pairings; Reach the fixed station that 8 expressions are used to transmit.In Figure 1A and 1B, double-faced pressure-sensitive adhesive sheet 5 is laminated on the side of whole or almost whole fixed head 6, and FPC 4 sticks to the predetermined portions of the formation of pressure-sensitive adhesive layer 51 of double-faced pressure-sensitive adhesive sheet 5.More specifically, double-faced pressure-sensitive adhesive sheet 5 is sticked on a side of fixed head 6, utilize FPC to arrange pilot pin 72 and hole 72a simultaneously, FPC 4 is sticked to regularly the predetermined portions of the formation of pressure-sensitive adhesive layer 51 of two-sided adhesive film 5 opposite sides., utilize fixedly motherboard and the hole 71a of pilot pin 71, the fixed head 6 that has adhered to FPC 4 is fixed on the fixed station 8 that is used to transmit thereafter.Incidentally, the hole 71a that is used for fixing the motherboard of pilot pin 71 by its insertion reaches by it and inserts the hole 72a that FPC arranges pilot pin 72, can after being laminated on the fixed head 6, double-faced pressure-sensitive adhesive sheet 5 form by the combination of punching press double-faced pressure-sensitive adhesive sheet 5 with fixed head 6.
In such a way, in this embodiment, FPC is placed and sticks to the presumptive area of the pressure-sensitive adhesive laminar surface of the fixed head that the surface has formation of pressure-sensitive adhesive layer.Thereby FPC can be fixed on the fixed head at an easy rate.In addition, when electronic unit was installed in FPC and needs to remove the FPC that electronic unit has been installed after going up, the fixed head that only FPC that electronic unit has been installed need be had simply formation of pressure-sensitive adhesive layer from the surface was removed and is got final product.In other words, need not to peel off adhesive tape.Therefore, machinability that can be good is fixed on FPC on the fixed head and from fixed head and removes.
In addition, because the lower surface of FPC all is fixed on the fixed head by formation of pressure-sensitive adhesive layer, so FPC can be securely fixed on the fixed head.Therefore, the gap between each FPC and fixed head (the lip-deep formation of pressure-sensitive adhesive layer of fixed head) is very little or very close to each other.Therefore, when electronic unit is installed in FPC and goes up, among each FPC not the location move etc., so electronic unit can higher positional accuracy be installed on the FPC.
Secondly, Fig. 2 A and 2B are the schematic diagrames that electronic unit is installed in second embodiment of the method on the FPC according to of the present invention.In this embodiment, double-faced pressure-sensitive adhesive sheet 5 stick on the FPC 4 with the surperficial facing surfaces that electronic unit is installed on (hereinafter being sometimes referred to as " fixed head bonding plane "), so FPC 4 sticks on the predetermined portions of fixed head 6 regularly by double-faced pressure-sensitive adhesive sheet 5.More specifically, after utilizing motherboard fixedly pilot pin 71 and hole 71a are fixed on fixed head 6 on the fixed station 8 that is used to transmit, double-faced pressure-sensitive adhesive sheet 5 is sticked on respectively on the fixed head bonding plane of FPC 4.Then, utilize FPC to arrange pilot pin 72 and hole 72a, the formation of pressure-sensitive adhesive layer of having pasted the double-faced pressure-sensitive adhesive sheet 5 exposed sides on the FPC 4 of double-faced pressure-sensitive adhesive sheet 5 is sticked on the fixed head 6, thereby FPC 4 is sticked to regularly the predetermined portions on the surface of fixed head 6.
In such a way, in this embodiment, when FPC sticked on the fixed head, adhesive sheet sticked on the FPC in advance, so that form formation of pressure-sensitive adhesive layer on the fixed head bonding plane of FPC.Then, the FPC that has formation of pressure-sensitive adhesive layer on the fixed head bonding plane is placed on the predetermined portions of fixed head and adhered thereto securely.Thereby FPC can easily be fixed on the fixed head.In addition, the removal of the FPC of electronic unit respectively has been installed after the installation electronic unit can remove by simple method, in the method, the FPC that electronic unit has been installed is removed from fixed head, and the adhesive sheet that will stick on accordingly on the fixed head bonding plane of FPC is peeled off from fixed head.In other words, need not to peel off many adhesive tapes.Therefore, machinability that can be good is fixed on FPC on the fixed head and from fixed head and removes.
In addition, because the lower surface of each FPC is fixed on the fixed head whole or in part by adhesive sheet, so the gap between FPC and fixed head is very little or do not have a gap.Therefore, when electronic unit was installed in FPC and goes up, did not move etc. the location in FPC, so electronic unit can be installed on the FPC with higher positional accuracy.
First embodiment described adhesive sheet 5 and at first has been laminated to situation on the fixed head 6, and second embodiment has been described adhesive sheet 5 and at first has been laminated to situation on the FPC 4.The difference of two embodiments just is this, but has identical effect.
In addition, according to the present invention, the adhesive sheet 5 that each FPC 4 can have formation of pressure-sensitive adhesive layer by at least one side of utilizing its base material is fixed on the fixed head.Therefore, the present invention also is included in and is used for when being installed in electronic unit on the flexible printed circuit surface flexible print circuit is fixed on adhesive sheet on the fixed head.
Fixed head
Fixed head 6 is not had special restriction, can form the fixedly plate of adhesive sheet of formation of pressure-sensitive adhesive layer or its surface as long as fixed head is its surface.As fixed head 6, can use hard being enough to guarantee the plate of glacing flatness, as aluminium sheet, glass plate or based on the plate of epoxy resin.But, fully without limits to the material of plate, shape etc.Material, shape etc. can suitably be selected according to the erection unit (particularly automatic installation apparatus) of electronic unit on FPC is installed.
In addition, its surface has forming by adhesive sheet (pressure-sensitive tape or its analog) is sticked on the fixed head like that the fixed head 6 of formation of pressure-sensitive adhesive layer 51 can be shown in first embodiment, thereby makes the pressure-sensitive adhesive laminar surface in the adhesive sheet be positioned at a side opposite with fixed head one side.As selection, shown in Fig. 1 C, can use on it by using the fixed head 6 that pressure-sensitive adhesive has formed the formation of pressure-sensitive adhesive layer 51 that is made of pressure-sensitive adhesive.
The general introduction of adhesive sheet
Adhesive sheet as the formation of pressure-sensitive adhesive layer that forms the fixed head surface can use single face adhesive sheet shown in Figure 3 or double-faced pressure-sensitive adhesive sheet shown in Figure 4.Fig. 3 is the sectional drawing according to the example of adhesive sheet of the present invention, and Fig. 4 is the sectional drawing according to another example of adhesive sheet of the present invention.
In Fig. 3, Reference numeral 1 is represented the adhesive sheet (hereinafter be sometimes referred to as " the fixedly adhesive sheet of FPC " or abbreviate " adhesive sheet " as) of fixing flexible printed circuit; 2 represent formation of pressure-sensitive adhesive layer; Reach 3 and represent base material.In the example of Fig. 3, fixedly the adhesive sheet 1 of FPC has the structure that formation of pressure-sensitive adhesive layer 2 wherein has been laminated to base material 3 one sides (single face).On the other hand, in Fig. 4, Reference numeral 11 representatives are the adhesive sheet of FPC fixedly; 21 represent formation of pressure-sensitive adhesive layer; Reach 31 and represent base material.In the example of Fig. 4, fixedly the adhesive sheet 11 of FPC has the structure that formation of pressure-sensitive adhesive layer 21 wherein has been laminated to base material 31 both sides.In this mode of the present invention, can use formation of pressure-sensitive adhesive layer wherein or formation of pressure-sensitive adhesive layer to be laminated to the thin slice of the one or both sides of base material, as the fixing adhesive sheet 1 or 11 of FPC.Especially in second embodiment, can preferably use double-faced pressure-sensitive adhesive sheet shown in Figure 4.In addition, only can also use the double-faced pressure-sensitive adhesive sheet of the no base material of making by formation of pressure-sensitive adhesive layer.
Base material
Base material in adhesive sheet 1 or 11 3 or 31 there is not special restriction.Base material 3 or 31 example can comprise the plastic film of being made by polyester plastics, as glassine paper, and polytetrafluoroethylene, polyethylene, or polyethylene terephthalate; The sheet rubber of making by natural rubber or butyl rubber; The foaming body of making by polyurethane or neoprene; And metal forming, as aluminium foil or Copper Foil.Yet, can preferably use the porous substrate of making by fiber material, for example paper or nonwoven fabrics.
Because scolder can melt in the process that electronic unit is installed usually, so FPC will be exposed to very high temperature, although be the short time.For example, although have multiple condition in based on ultrared heating (IR heating), typical heating condition is that the peak temperature as maximum temperature is about 260 ℃, and the retention time of peak temperature is about 20 seconds.When adhesive sheet such as pressure-sensitive tape stood this heating steps under high-temperature very, contained humidity etc. added at IR and pines for unexpected expansion (gasification) in the pressure-sensitive adhesive.Just because of this, FPC and/or fixed head can be peeled off mutually with adhesive sheet such as pressure-sensitive tape.Yet, when using porous substrate as the base material 3 of the fixing adhesive sheet of FPC or 31, can suppress or prevent the reduction of viscosity,, also can keep high viscosity in heating steps (especially IR heating steps) even fixedly the adhesive sheet of FPC is exposed under the high temperature.In other words, even after the very high heating steps of temperature, FPC and/or fixed head still keep sticking on the adhesive sheet.More specifically, when base material is porous substrate, the gas component that gasifies in the formation of pressure-sensitive adhesive layer can be discharged into the outside by porous substrate, even contained moisture etc. expands (gasification) suddenly in the heating steps of melting solder etc. in the pressure-sensitive adhesive, thereby also can suppress or prevent that FPC from peeling off mutually with formation of pressure-sensitive adhesive layer.Therefore, even after heating steps, position transfer can not appear, so electronic unit can be installed on the FPC to the high position accuracy yet in FPC.In other words, when using porous substrate, can greatly improve electronic unit is installed in positional accuracy on the FPC as base material.
Porous substrate needs only base material and has porousness not having special restriction aspect the shape of the material of base material and various character such as micropore and diameter (average cell size) and the density.Preferred porous substrate has unlimited cell shape, with the gas component that gasifies in the outside release formation of pressure-sensitive adhesive layer.In other words, when porous substrate had unlimited cell shape, the gas component that gasifies in the formation of pressure-sensitive adhesive layer (as water vapour) can partly be discharged into the outside from the open end of porous substrate.
In the present invention, the example of porous substrate, the particularly porous substrate of being made by fiber material comprise the paper material (as brown paper, crimped paper, Japan paper, the paper of clay coated does not contain the paper of timber, glassine paper and stretchable paper (Clupak paper)) of porous; And the fiber material of porous (based on the nonwoven fabrics or the woven fabric of synthetic or natural fiber, as aramid fibre, rayon fiber, typel, polyester fiber, vinal, Fypro, polyolefine fiber, fluorine fiber (fluorofiber), stainless steel fibre, asbestos, glass cloth, glass fibre, abaca, and paper pulp).In porous substrate based on fiber material, can be used alone fiber material, also can be used in combination two or more fiber materials.In addition, porous substrate can be used alone, also two or more porous substrates can be used in combination.
In the present invention, as porous substrate,, preferably use Japan paper or nonwoven fabrics from aspects such as the permeability of gas components such as the grappling performance of pressure-sensitive adhesive, water vapour, thermal endurances.Incidentally, from the thermal endurance viewpoint, preferably use aramid fibre as porous substrate.In addition, the paper that can use Japan paper or clay coated is as porous substrate, because their costs are low and have a thermal endurance.
In addition, in the present invention, preferred porous substrate does not comprise any additives such as adhesive, and only is made of fiber material (fibre fractionation).Preferred neutral especially or be neutral basically and comprise the porous substrate of rayon fiber as its fibre fractionation.As this porous substrate that comprises rayon fiber, the preferred high porous substrate of rayon fiber content.For example, can select the content of rayon fiber to be not less than 30 weight %, preferably be not less than 50 weight % with respect to total fibre fractionation.
Thickness to base material (particularly porous substrate) does not have special restriction.This thickness can be selected according to using suitably.Usually, for example this thickness is about 25-200 μ m (preferred 50-150 μ m).
Incidentally, when using paper or nonwoven fabrics as porous substrate, (arealweight) do not have special restriction to its weight per unit area.For example, weight per unit area can be about 1-300g/m 2
As selection, can use the foaming body of sheet in the present invention as porous substrate.
Formation of pressure-sensitive adhesive layer
The pressure-sensitive adhesive that is used to form formation of pressure-sensitive adhesive layer 2 or 21 comprises the pressure-sensitive adhesive based on acrylic compounds, based on the pressure-sensitive adhesive of silicones, and based on the pressure-sensitive adhesive of rubber, wherein can will sneak in the elastomer such as additives such as tackifying resins.As pressure-sensitive adhesive, can preferably use based on the pressure-sensitive adhesive of acrylic compounds with based on the pressure-sensitive adhesive of silicones.After thermal endurance and installation, make the easy degree of FPC disengaging, be preferably based on the pressure-sensitive adhesive of acrylic compounds.When especially needing high-fire resistance, be preferably based on the pressure-sensitive adhesive of silicones.Pressure-sensitive adhesive can be used alone, also two or more pressure-sensitive adhesives can be used in combination.
Based on the pressure-sensitive adhesive of acrylic compounds, as its base polymer, comprise copolymer based on (methyl) alkyl acrylate, it comprises (methyl) alkyl acrylate as its main monomer component.More specifically, use by the polymer (comprising copolymer) of (methyl) alkyl acrylate constitute based on the copolymer of the polymer of acrylic compounds or (methyl) alkyl acrylate and other single ethylene unsaturated monomers (but monomer of copolymerization) as base polymer, and in base polymer, sneak into as required such as additives such as crosslinking agent and tackifying resins.
Usually, as (methyl) alkyl acrylate, can use preferably that carbon number is (methyl) alkyl acrylate of about 4-14 in each alkyl.Particularly, as (methyl) alkyl acrylate, preferred (methyl) butyl acrylate, (methyl) Isooctyl acrylate monomer, (methyl) 2-EHA, (methyl) acrylic acid ester in the different ninth of the ten Heavenly Stems, (methyl) dodecylacrylate etc. used.Can be used alone (methyl) alkyl acrylate, also can be used in combination two or more (methyl) alkyl acrylates.
These (methyl) alkyl acrylates are as main monomer component.Particularly, in the polymer based on acrylic compounds, (methyl) alkyl acrylate can be selected from respect to the ratio of each monomer component total weight and be not less than 50 weight % (50-100 weight %).Preferably the ratio of (methyl) alkyl acrylate is not less than 80 weight %, more preferably is not less than 90 weight %, most preferably is not less than 97 weight %.
When not only using (methyl) alkyl acrylate, but also use can with (methyl) alkyl acrylate copolymer and the copolymerisable monomer that comprises functional group as based on the monomer component of the polymer of acrylic compounds the time, can improve the adhesiveness of formation of pressure-sensitive adhesive layer to adherend such as FPC.This example that comprises the copolymerisable monomer of functional group comprises carboxylic copolymerisable monomer, the copolymerisable monomer of nitrogen atom, and the copolymerisable monomer of hydroxyl contains the copolymerisable monomer of epoxy radicals, contains the copolymerisable monomer of sulfydryl, and contains the monomer of NCO.More specifically, the example that comprises the copolymerisable monomer of functional group comprises carboxylic copolymerisable monomer such as acrylic acid, methacrylic acid, itaconic acid, maleic anhydride, crotonic acid, maleic acid or fumaric acid; The copolymerisable monomer of nitrogen atom is as (methyl) acrylamide, N-vinyl pyrrolidone, (methyl) acryloyl morpholine, (methyl) acrylonitrile, (methyl) acrylic-amino ethyl ester, cyclohexyl maleimide or isopropyl maleimide; The copolymerisable monomer of hydroxyl is as (methyl) acrylic acid methylol ester, (methyl) acrylic acid 2-hydroxy methacrylate, (methyl) acrylic acid 3-hydroxy propyl ester or glycerine dimethylacrylate; The copolymerisable monomer that contains epoxy radicals is as (methyl) glycidyl acrylate; And contain the copolymerisable monomer such as the 2-methacryloxyethyl isocyanates of NCO.Can introduce conducts such as sulfydryl and be positioned at the functional group of chain-transferring agent tail end.Contain in the copolymerisable monomer of functional group at these, from the viewpoint of reactive and versatility, preferred carboxylic monomer.In addition, as preferred carboxylic monomer, can mention acrylic acid and methacrylic acid.
The copolymerisable monomer that contains functional group can roughly not be higher than 10 weight % (for example 0-10 weight %) with respect to the ratio of each monomer component total weight, preferably is not higher than 3 weight % (0-3 weight %).
In addition, except aforementioned principal monomer with contain the copolymerisable monomer of functional group, can also comprise other copolymerisable monomer as required based on the polymer of acrylic compounds as monomer component.The example of this copolymerisable monomer comprises that the carbon number in each alkyl is (methyl) alkyl acrylate of 1-3, (methyl) methyl acrylate for example, (methyl) ethyl acrylate, (methyl) acrylic acid n-propyl or (methyl) isopropyl acrylate; Carbon number in each alkyl is 5-20's (methyl) alkyl acrylate, for example (methyl) stearyl acrylate base ester; Vinyl acetate is as vinyl acetate; The monomer of styrene-based such as styrene; Reach monomer such as ethene or propylene based on alpha-olefin.
In polymer, except that being selected from the scope that is lower than 50 weight % with respect to the ratio of each monomer component total weight as the monomer component (methyl) alkyl acrylate of principal monomer based on acrylic compounds.Yet preferably this ratio is lower than 20 weight %, more preferably less than 10 weight %, especially preferably is lower than 3 weight %.
In the present invention, add known crosslinking agent, perhaps add multi-functional (methyl) acrylate and help carrying out photopolymerization as helping improving the maintenance performance of pressure-sensitive adhesive based on the compound of isocyanates or based on the compound of epoxy.Crosslinking agent can be used alone, also two or more crosslinking agents can be used in combination.The examples for compounds based on isocyanates as crosslinking agent comprises the many functional group isocyanates's compound with two or more NCOs, it is aromatic vulcabond, as methyl diphenylene diisocyanate, 2,4-toluylene group diisocyanate, 2,6-toluylene group diisocyanate, phenylene vulcabond, 1, the 5-naphthalene diisocyanate, eylylene diisocyanate or toluylene group diisocyanate; Aliphat or alicyclic vulcabond, as hexamethylene diisocyanate, IPDI or 4,4 '-dicyclohexyl methyl hydride diisocyanate; The dimer of methyl diphenylene diisocyanate; The product of trimethylolpropane and toluylene group diisocyanate; The product of trimethylolpropane and hexamethylene diisocyanate; The polyethers polyisocyanates; And polyester polyisocyanates.On the other hand, comprise multi-group epoxy compound with two or more epoxy radicals based on the examples for compounds of epoxy, as diglycidylaniline, and the glycerine glycidol ether.
In addition, example as multi-functional (methyl) acrylate of photopolymerization crosslinking agent comprises trimethylolpropane tris (methyl) acrylate, pentaerythrite four (methyl) acrylate, ethylene glycol bisthioglycolate (methyl) acrylate, and 1,6-hexylene glycol two (methyl) acrylate.
Polymer based on acrylic compounds can utilize common polymerization such as emulsion polymerization or solution polymerization process, common batchwise polymerization by the monomer component mixture, drip polymerization (continuousdropping polymerization) continuously, the crack drips polymerization (split dropping polymerization) and waits synthetic.In polymerization, can use common or known polymerization initiator.In addition, in emulsion polymerisation, can use common or known emulsifying agent.Incidentally, polymerization temperature is for example 30-80 ℃.
Incidentally, when needing the pressure-sensitive adhesive of high-fire resistance especially, be preferably based on the polymer of ultraviolet irradiation.In addition,, can in pressure-sensitive adhesive, add various additive commonly known in the art, tackifier for example, plasticizer, softening agent, filler, colouring agent (pigment, dyestuff etc.), age resister, and antioxidant as optional components.The example of this tackifying resin comprises based on the resin of oil such as aliphatic Petropols, aromatic Petropols, or based on the alicyclic petroleum resin (alicyclic saturated hydrocarbons resin) of hydrogenated aromatic Petropols; Based on the resin of rosin (as rosin, perhaps hydrogenated wood rosin glycerol ester); Terpenyl resin (as terpene resin, aromatic sex change terpene resin, hydrogenated terpene resin, perhaps terpene phenolic resin); The resin of styrene-based; And coumarone-indene resin.
Formation of pressure- sensitive adhesive layer 2 or 21 can form at least one side of porous substrate by applying pressure-sensitive adhesive.
Thickness to formation of pressure- sensitive adhesive layer 2 or 21 does not have special restriction.For example, this thickness can be selected from about 10-200 μ m, the scope of preferably about 20-100 μ m.
In addition, according to physical property, preferred formation of pressure-sensitive adhesive layer has 10 under 0-300 ℃ temperature 3-10 6Pa (frequency: energy storage modulus of elasticity 1Hz).In this case, the energy storage modulus of elasticity of formation of pressure-sensitive adhesive layer the fixing operating temperature range of the adhesive sheet of FPC (for example, be not less than substantially 0 ℃ and be not higher than 300 ℃ temperature range) in change very for a short time, and keep the energy storage modulus of elasticity of this scope.Thereby, can suppress or the variation or the degeneration of the formation of pressure-sensitive adhesive layer that prevents to cause because of temperature.Therefore, even formation of pressure-sensitive adhesive layer is heated (IR heating etc.) in heating steps (IR soft heat step), do not take place softening in the formation of pressure-sensitive adhesive layer or sclerosis, so formation of pressure-sensitive adhesive layer can at room temperature keep good viscosity and removeability yet.Therefore, even FPC does not separate with support plate after heating steps yet.In addition, even FPC spins off from support plate, the pressure-sensitive adhesive component in the formation of pressure-sensitive adhesive layer is not retained in FPC yet and goes up (in other words, not existing adhesive to shift).
Incidentally, in the present invention, as long as be provided in the formation of pressure-sensitive adhesive layer of at least one side of base material the energy storage modulus of elasticity (frequency: 1Hz) under 0-300 ℃ temperature above-mentioned 10 3-10 6Pa (1 * 10 3-1 * 10 6Pa) just enough in the scope.Preferred especially energy storage modulus of elasticity is 10 4-10 6The scope of Pa is most preferably 10 5-10 6The scope of Pa.
Moreover Fig. 5 and Fig. 6 show other example of formation of pressure-sensitive adhesive layer.In Fig. 5 or Fig. 6, formation of pressure-sensitive adhesive layer 2 or formation of pressure-sensitive adhesive layer 21 are laminated to a side of the fixing base material 3 of the adhesive sheet 1 of FPC or the fixing both sides of the base material 31 of the adhesive sheet 11 of FPC, and form a plurality of protuberance 2a or 21a in each surface of the surface of formation of pressure-sensitive adhesive layer 2 or formation of pressure-sensitive adhesive layer 21.Therefore, be formed in each surface of formation of pressure- sensitive adhesive layer 2 or 21 with protuberance 2a or the corresponding depressed part 2b of 21a or 21b.Protuberance 2a or 21a are linear protuberance shown in Figure 7, and depressed part 2b or 21b form at linear protuberance 2a or 21a neutral line ground.Fig. 7 is the schematic diagram from the adhesive sheet of the fixedly FPC of top view Fig. 5 or Fig. 6.
Fig. 9 and Figure 10 show other example of formation of pressure-sensitive adhesive layer.In Fig. 9 or Figure 10, formation of pressure-sensitive adhesive layer 2 or formation of pressure-sensitive adhesive layer 21 are laminated to the one or both sides of adhesive sheet 1 or 11 the base material of fixing FPC, and form a plurality of hole 2c of portion or 21c in each surface of the surface of formation of pressure-sensitive adhesive layer 2 or formation of pressure-sensitive adhesive layer 21.Therefore, be formed in each surface of formation of pressure- sensitive adhesive layer 2 or 21 with the 2c of hole portion or the corresponding non-hole 2d of portion of 21c or 21d.2c of hole portion or 21c are shown in Figure 11 circular hole portion, and the non-hole 2d of portion or 21d are formed among the circular 2c of hole portion or 21c.Figure 11 is the schematic diagram from the adhesive sheet of the fixedly FPC of top view Fig. 9 or Figure 10.
In this manner, in this example, a plurality of protuberance 2a or 21a or a plurality of depressed part 2c or 21c are formed in the surface of the adhesive sheet 1 of fixing FPC or 11 formation of pressure-sensitive adhesive layer 2 or 21, make the surface area of formation of pressure-sensitive adhesive layer 2 or 21 increase.In addition, the bottom of the surface of formation of pressure-sensitive adhesive layer and each protuberance 2a or 21a or the distance between the central inner (the shortest distance), perhaps the bottom of the surface of formation of pressure-sensitive adhesive layer and non-depressed part 2d or 21d or the distance between central inner (the shortest distance) are shorter than the distance in protuberance 2a or 21a or depressed part 2c or the inchoate situation of 21c.Therefore, even contained moisture etc. expands (gasification) suddenly in the heating steps (especially IR heating steps) of melting solder in the pressure-sensitive adhesive, also can suppress or stop FPC to peel off mutually with formation of pressure-sensitive adhesive layer.This is because formed depression and protuberance or depressed part in the surface of formation of pressure-sensitive adhesive layer, make the surface area of formation of pressure-sensitive adhesive layer increase, but also because the gas component that gasifies in the formation of pressure-sensitive adhesive layer can utilize the recess of formation of pressure-sensitive adhesive layer or hole portion to be discharged into the outside.
In addition, when protuberance 2a or 21a form as shown in Figure 7 linearly, between the end and the other end that linear recess 2b among linear protuberance 2a or the 21a or 21b are formed at formation of pressure-sensitive adhesive layer, make recess have openend in each end.Therefore, even the upper surface of the recess of formation of pressure-sensitive adhesive layer is covered by FPC, the gas component that gasifies in the formation of pressure-sensitive adhesive layer also can be discharged into the outside by described openend (even whole surface is covered by FPC, also being by openend) by the recess of linear proterties.Thereby, can further suppress or stop FPC to peel off mutually with formation of pressure-sensitive adhesive layer.
Therefore, when the adhesive sheet that uses according to the fixedly FPC of this example, can suppress or prevent the reduction of viscosity further, even fixedly the adhesive sheet of FPC is exposed to high temperature in heating steps (especially IR heating steps), so can keep high viscosity.In other words, even after the heat step, FPC and/or fixed head still keep sticking on the adhesive sheet of fixing FPC.
In addition, when the fixing adhesive sheet of FPC sticks on fixed head and FPC when going up, can prevent that bubble from entering interface between formation of pressure-sensitive adhesive layer and the fixed head and the interface between formation of pressure-sensitive adhesive layer and the FPC.
Therefore, in this example, fixedly one of emphasis of the adhesive sheet of FPC is the surface area that has increased formation of pressure-sensitive adhesive layer.In addition, another emphasis is the shape that forms the formation of pressure-sensitive adhesive layer recess, make the gas component that gasifies in the formation of pressure-sensitive adhesive layer can utilize the shape of the recess of formation of pressure-sensitive adhesive layer to be discharged into the outside, even the upper surface of the recess of formation of pressure-sensitive adhesive layer is covered by FPC by the openend of recess.In other words, surface configuration to formation of pressure-sensitive adhesive layer does not have special restriction, as long as by this surface configuration, the surface configuration that the gas component in formation of pressure-sensitive adhesive layer of gasifying can be utilized the surface area of increase and further utilize formation of pressure-sensitive adhesive layer is discharged into the outside by the surface of formation of pressure-sensitive adhesive layer.
Each protuberance of pressure-sensitive adhesive laminar surface or the section configuration of each hole portion are not had special restriction, protrude or concave shape as long as protuberance or hole portion have at least.For example, this shape can be mountain peak shape or inverted mountain peak shape, perhaps linearity configuration.The example of this mountain peak shape shape of protuberance comprises the shape that is similar to circular cone, be similar to the shape of cylinder, be similar to the shape (as be similar to the shape of triangular pyramid or be similar to the shape of four jiaos of pyramids) of polygonal pyramid, and be similar to the shape (as be similar to the shape of triangular prism or be similar to the shape of four jiaos of prisms) of polygonal prism.On the other hand, the example of linear protuberance is the protuberance of mountain peak shape protuberance linear extension wherein.The example of the inverted mountain peak shape shape of depressed part comprises the shape that is similar to inverted conical, be similar to the shape of being inverted cylinder, be similar to the shape (as be similar to the shape of being inverted triangular pyramid or be similar to the shape of being inverted four jiaos of pyramids) of being inverted polygonal pyramid, and be similar to the shape (as be similar to the shape of inverted triangular prism or be similar to the shape of inverted four jiaos of prisms) of inverted polygonal prism.On the other hand, the example of linear hole portion is the hole portion of shape hole, inversion mountain peak portion linear extension wherein.
As selection, the section configuration of each protuberance can be polygonal (for example be basically quadrangle or be triangle basically) basically or be circular (for example half elliptic or semicircle) basically.In addition, the diameter of each protuberance (radius, the length of side etc.) can make less or bigger, perhaps makes to be constant from bottom to top.And flat-top or pinnacle can be made in the top, perhaps make dome.The section configuration of each hole portion can be polygonal (for example be basically quadrangle or be triangle basically) basically, perhaps is circular (for example half elliptic or semicircle) basically.In addition, the diameter of each hole portion (radius, the length of side etc.) can make less or bigger, also can make from the top to basal surface or bottom be constant.And if depressed part has basal surface, then basal surface can be flat or sharp, also can be round.
Diameter to each protuberance or each hole portion does not have special restriction, but can suitably select according to the size of for example FPC.For example, the average diameter or the average length of side can be selected from about 0.01-10mm, preferably the scope of about 0.05-5mm.
In addition, the height of each protuberance there is not special restriction, but can be according to the size of for example FPC, and the thickness of formation of pressure-sensitive adhesive layer etc. are suitably selected.For example, this highly can be selected from about 0.01-0.5mm, preferably the scope of about 0.03-0.1mm.
In addition, the degree of depth of each hole portion there is not special restriction, but can be according to the size of for example FPC, and the thickness of formation of pressure-sensitive adhesive layer, the thickness of adhesive sheet etc. are suitably selected.Particularly, the bottom of hole portion can be made of formation of pressure-sensitive adhesive layer or base material.In other words, hole portion can be the hole of depression.As selection, hole portion can penetrate base material and the formation of pressure-sensitive adhesive layer relative with base material.That is to say that hole portion can be that a surface from adhesive sheet penetrates into another surperficial through hole.Incidentally, this hole portion based on through hole can easily prepare by the punching press adhesive sheet.
In addition, the interval between each protuberance (width of each recess) there is not special restriction, but can be according to the suitably selections such as size of for example FPC.For example, this interval can be selected from about 0.01-10mm, preferably the scope of about 0.05-5mm.
Interval between the portion of hole (width of each non-hole portion) do not had special restriction yet, but can suitably select according to the size of for example FPC etc.For example, this interval can be selected from about 0.1-10mm, preferably the scope of about 0.5-5mm.
This protuberance or hole portion can be formed at the whole surface of formation of pressure-sensitive adhesive layer, also can partly be formed at a place or the many places on surface.When partly forming protuberance or hole portion, preferred protuberance or hole portion are formed at the part that comprises the predetermined portions at least of pasting FPC.
In addition, protuberance or hole portion can form regularly, and protuberance or hole portion can form with linear mode from whole plane graph.
Though not talkative recess or non-hole portion have and the corresponding shape of protuberance or hole portion, but recess or non-hole portion are formed at and the corresponding part of protuberance or hole portion.In other words, the bottom of recess is formed by the bottom of the formation of pressure-sensitive adhesive layer of its underpart, and the wall portion of recess is formed by the protuberance of formation of pressure-sensitive adhesive layer.The end face of formation of pressure-sensitive adhesive layer is formed at the top of non-hole portion, but not the wall portion of hole portion then forms the wall surface of hole portion.
Even when in formation of pressure-sensitive adhesive layer, providing protuberance, the thickness (average thickness, the perhaps lowest part of protuberance and the thickness between the top) of formation of pressure-sensitive adhesive layer there is not special restriction yet.For example, this thickness can be selected from about 10-200 μ m, the scope of preferably about 20-100 μ m.
Incidentally, in Fig. 5 and Fig. 6, formation of pressure-sensitive adhesive layer 2 and 21 depressed part and protuberances by linearity constitute, and formation of pressure-sensitive adhesive layer constitutes the bottom of depressed part.Even formation of pressure-sensitive adhesive layer is not formed at the bottom of depressed part, for example, even base material forms the bottom of depressed part, also can bring into play with these examples in similar effect.Particularly, even the section configuration of formation of pressure-sensitive adhesive layer is similar to the mountain peak, that is to say, even its section configuration is similar to the formation of pressure-sensitive adhesive layer on mountain peak and is formed on the base material, as shown in Figure 8, make protuberance constitute, also can bring into play similar effect by the formation of pressure-sensitive adhesive layer that section configuration is similar to the mountain peak.Incidentally, Fig. 8 is the sectional drawing according to another example of adhesive sheet of the present invention.In Fig. 8, Reference numeral 12 is represented adhesive sheet; 22 represent formation of pressure-sensitive adhesive layer; Reach 32 and represent base material.Formation of pressure-sensitive adhesive layer 22 partly is formed at the both sides of base material 32, makes the section configuration of each formation of pressure-sensitive adhesive layer 22 be similar to the mountain peak.
Equally, in Fig. 9 and Figure 10, formation of pressure-sensitive adhesive layer 2 and 21 is formed by the hole portion that penetrates formation of pressure-sensitive adhesive layer 2 and 21 respectively.Therefore, there is not the bottom in each hole portion.Yet, even formation of pressure-sensitive adhesive layer is formed at the bottom of hole portion, even perhaps base material forms the bottom of hole portion, also can bring into play with these examples in similar effect.Particularly, even the section configuration of formation of pressure-sensitive adhesive layer is similar to the mountain peak, that is to say, even its section configuration is similar to the formation of pressure-sensitive adhesive layer on mountain peak and is formed on the base material, as shown in figure 12, make non-hole portion form, also can give play to similar effects by the formation of pressure-sensitive adhesive layer that section configuration is similar to the mountain peak.Incidentally, Figure 12 is the sectional drawing according to another example of adhesive sheet of the present invention.In Figure 12, Reference numeral 13 is represented adhesive sheet; 23 represent formation of pressure-sensitive adhesive layer; Reach 33 and represent base material.Formation of pressure-sensitive adhesive layer 23 partly is formed at the both sides of base material 33, makes each formation of pressure-sensitive adhesive layer 23 have the section configuration that is similar to the mountain peak.
The structure of adhesive sheet
Adhesive sheet 1,11,12 or 13 according to the present invention can be prepared as follows.For example, base material particularly at least one side of porous substrate (one-sided or bilateral) coating comprise pressure-sensitive adhesive as pressure sensitive adhesive compositions based on the pressure-sensitive adhesive of acrylic compounds, and carry out crosslinking Treatment by heating or based on the polymerization of ultra-violet radiation as required.Then, formation of pressure-sensitive adhesive layer is formed at least one side of base material (especially porous substrate).In addition, formation of pressure-sensitive adhesive layer can cover peeling liner as required.Therefore, according to adhesive sheet of the present invention can be two-sided adhesive sheet, its both sides at base material such as porous substrate have formation of pressure-sensitive adhesive layer, also can be the adhesive sheets of single face, and its side at base material such as porous substrate has formation of pressure-sensitive adhesive layer.
For the surface at formation of pressure-sensitive adhesive layer forms linear protuberance, preferably use the method for pressure sensitive adhesive compositions by the bar shaped coating.As selection, after forming formation of pressure-sensitive adhesive layer, can carry out surface treatment, so that form protuberance on the surface of formation of pressure-sensitive adhesive layer to it.In addition in the method, can be formed on the formation of pressure-sensitive adhesive layer that its surface has protuberance.
When hole portion was formed in the formation of pressure-sensitive adhesive layer, the hole portion hole portion of through hole (particularly based on) can form by the punching press formation of pressure-sensitive adhesive layer.Punching press (die-cut etc.) can carry out in crosslinking Treatment or before based on the polymerization of ultra-violet radiation.As selection, can after forming, formation of pressure-sensitive adhesive layer carry out surface treatment, so that hole portion is formed in the surface of formation of pressure-sensitive adhesive layer to formation of pressure-sensitive adhesive layer.In addition in the method, can be formed on the formation of pressure-sensitive adhesive layer that its surface has hole portion.
Be two-sided adhesive sheet preferably according to adhesive sheet of the present invention.Incidentally, in two-sided adhesive sheet, be laminated to that pressure-sensitive adhesive in each formation of pressure-sensitive adhesive layer of porous substrate both sides can differ from one another or identical.
By utilizing this adhesive sheet, can prepare the fixed head that its surface shown in first embodiment has formation of pressure-sensitive adhesive layer.Incidentally, in Figure 1A and 1B and Fig. 2 A and 2B, comprise that porous substrate is that the double-faced pressure-sensitive adhesive sheet 5 of its base material is provided between fixed head 6 and the FPC 4, so that fixed head 6 is combined with FPC 4.In other words, fixed head 6 and FPC 4 combine togather by double-faced pressure-sensitive adhesive sheet 5.Particularly, although Figure 1A to 1C is to comprising that porous substrate is the situation of the double-faced pressure-sensitive adhesive sheet 5 of its base material, the whole lip-deep situation that perhaps formation of pressure-sensitive adhesive layer 51 is laminated to fixed head 6 one sides is illustrated, but double-faced pressure-sensitive adhesive sheet 5 or formation of pressure-sensitive adhesive layer 51 also can be only at predetermined portions (for example, will place the part of FPC, and part on every side) stick on the surface of fixed head 6.
On the other hand, shown in second embodiment, by utilizing this adhesive sheet, can be in the time electronic unit will being installed in the FPC surface, preparation is used for that wherein FPC is fixed on adhesive sheet on the fixed head and has sticked to FPC on the fixed head bonding plane of FPC.Particularly, although to comprising that porous substrate is that the whole lip-deep situation that the double-faced pressure-sensitive adhesive sheet 5 of its base material sticks to FPC 4 one examples is illustrated, double-faced pressure-sensitive adhesive sheet 5 also can partly stick to the side of FPC 4 for Fig. 2 A and 2B.
According to the present invention, adhesive sheet can be the single face adhesive sheet (pressure-sensitive tape) with base material, comprises that particularly porous substrate is the single face adhesive sheet of its base material.In this case, by using pressure-sensitive adhesive the surface of the base material side of pressure-sensitive adhesive band is sticked on the whole surface or predetermined portions of fixed head, thereby can be formed on the fixed head that its surface has the formation of pressure-sensitive adhesive layer of pressure-sensitive tape.Thereby FPC can stick on the surface of formation of pressure-sensitive adhesive layer regularly.
In addition, in order to peel off adhesive sheet from the fixed head of having pasted adhesive sheet easily, do not damage simultaneously adhesive sheet itself again, need the tensile strength of adhesive sheet (for example to be not less than 5N/15mm, 5-150N/15mm), preferably be not less than 8N/15mm (for example, 8-50N/15mm).Particularly, even the tensile strength of preferred adhesive sheet also is not less than 5N/15mm (more preferably being not less than 8N/15mm) after electronic unit is installed.In other words, in the present invention, stick to the adhesive sheet on the fixed head, electronic unit be installed on the FPC by heating steps and FPC that electronic unit has been installed after fixed head is peeled off, peel off from fixed head.Therefore, the tensile strength of adhesive sheet is important after electronic unit is installed.Therefore, when adhesive sheet had the peel strength of this scope after electronic unit is installed, adhesive sheet was easily peeled off and is not damaged from fixed head, makes the removeability of adhesive sheet be enhanced.Thereby fixed head can be reused.
In addition, in the present invention, adhesion strength between preferred formation of pressure-sensitive adhesive layer and the FPC (for example is not higher than 7N/20mm, 0.5-7N/20mm), more preferably no higher than 1-6N/20mm, so that being installed, the FPC of electronic unit can after electronic unit is installed on the FPC, peel off (in other words, so that improve the picking up property (pick-up property) of FPC) mutually with formation of pressure-sensitive adhesive layer.In addition, when the double-faced pressure-sensitive adhesive sheet shown in use Figure 1A and the 1B, the adhesion strength between adhesive sheet and the fixed head can be selected by the adhesion strength scope that is similar between adhesive sheet and the FPC.According to the present invention, the adhesion strength in the adhesive sheet can make an addition to the kind of additive wherein by suitably selecting the kind of pressure-sensitive adhesive, and the mixing ratio of additive waits to be adjusted.
Incidentally, although to pilot pin 71 and 72, fixed station 8 grades that are used to transmit do not have special restriction, and they can suitably be selected according to the equipment (particularly automatic installation apparatus) that electronic unit is installed on the FPC.
In this mode, the method according to this invention, FPC can be fixed on the fixed head according to the straightforward procedure that FPC is placed and sticks on the formation of pressure-sensitive adhesive layer that is provided on the fixed head shown in first embodiment.As selection, adhesive sheet can be sticked on the fixed head bonding plane of FPC, shown in second embodiment in advance.Therefore, unlike the prior art, need not to paste adhesive tape.In addition, when when fixed head is removed FPC,, will be very smoothly if remove the FPC that electronic unit is housed simply.Therefore, unlike the prior art, need not to remove adhesive tape.Therefore, paste FPC on a large scale and on fixed head or from the machinability that fixed head is removed FPC, be improved, make FPC promptly to stick on the fixed head or and remove, reduce manufacturing cost simultaneously from fixed head.
In addition, because the whole surface of FPC can stick on the fixed head regularly,, and between fixed head (particularly being formed at the formation of pressure-sensitive adhesive layer on fixed head surface) and FPC, exist very little or do not have the gap so FPC can firmly fix.Therefore, when being installed in electronic unit on the FPC, can not shift by occurrence positions among the FPC.Thereby electronic unit can the high position accuracy be installed on the FPC.
In addition, as mentioned above, even also worsen hardly or never afterwards at heating steps (for example IR heating steps) based on the viscosity of the pressure-sensitive adhesive of formation of pressure-sensitive adhesive layer.Therefore, also not location transfer among the FPC after heating.Thereby electronic unit can the high position accuracy be installed on the FPC.In other words, the positional accuracy that is installed on the FPC of electronic unit is greatly improved.And, when use comprises porous substrate is the adhesive sheet (particularly double-faced pressure-sensitive adhesive sheet) of its base material during as the adhesive sheet of fixing FPC, the outside that the gas component of generation such as water vapour can be discharged into system by aforesaid porous substrate after the heating steps.Therefore, adhesion strength worsens hardly or never.Thereby, can keep FPC to be fixed on predetermined part.In addition, after electronic unit was installed on the FPC, FPC can easily peel off with the lip-deep formation of pressure-sensitive adhesive layer of fixed head mutually.
In addition, when formation of pressure-sensitive adhesive layer when specific range of temperatures has specific energy storage modulus of elasticity, even afterwards, also can prevent the distortion and the deterioration of formation of pressure-sensitive adhesive layer further at above-mentioned heating steps (as the IR heating steps).Therefore, can after heating, keep excellent viscosity and removeability, make and do not take place to separate among the FPC and adhesive moves based on formation of pressure-sensitive adhesive layer.In addition, also not occurrence positions transfer among the FPC after the heating is so electronic unit can the high position accuracy be installed on the FPC.
In addition, when electronic unit was installed in tensile strength that FPC makes adhesive sheet after going up and is not less than 5N/15mm, adhesive sheet itself can not peeled off with fixed head with not being damaged after electronic unit is installed on the FPC mutually.
In addition, when making adhesion strength between formation of pressure-sensitive adhesive layer and the FPC not be higher than 7N/20mm, removing the picking up property that is fixed on the FPC on the fixed head can be improved.
Particularly, when protruding and depressed part, when perhaps hole portion is formed in the surface of formation of pressure-sensitive adhesive layer, the gas component such as the water vapour that produce after the heating steps (for example can utilize, by) recess or hole portion in the formation of pressure-sensitive adhesive layer, and be discharged into the outside of system by porous substrate (if base material is a porous substrate).Therefore, adhesion strength is degenerated hardly or never, thereby can further keep FPC to be fixed on predetermined portions.In addition, after electronic unit was installed on the FPC, FPC can easily peel off with adhesive sheet mutually.
Thereby the method according to this invention is that electronic unit is installed in utmost point useful method on the flexible print circuit.
In addition, adhesive sheet according to the present invention is the extremely useful adhesive sheet of fixing flexible printed circuit.
Incidentally, the electronic unit that be installed on the FPC there is not special restriction.The example of this electronic unit comprises IC, capacitor, connector, resistor, and LED (light-emitting diode).
＜embodiment 〉
With reference to embodiment the present invention is described more specifically below.Yet the present invention is not limited in these embodiment.Incidentally, " part " is meant weight portion to the term in the following explanation.
Embodiment 1
Acrylic rubber (trade name " Rheocoat R5000 ", by Toray Coatex Co., Ltd. makes) is dissolved in toluene, is the solution of 15 weight % with preparation base polymer content.In 100 parts of high solution, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mixing based on isocyanates, make pressure sensitive adhesive compositions thus.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 130 ℃ of following dried 5 minutes be the formation of pressure-sensitive adhesive layer of 50 μ m so that form thickness.This formation of pressure-sensitive adhesive layer is transferred to aramid fibre as porous substrate, and (trade name " Nomex " is by E.I.DuPont deNemours﹠amp; Co. manufacturing) the both sides of porous substrate.Thereby, make and comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet of its base material.Then, a side of double-faced pressure-sensitive adhesive sheet is sticked on the aluminium sheet, to make the fixed head that its surface has formation of pressure-sensitive adhesive layer.
Embodiment 2
With 2 parts benzoyl peroxide, and toluene mixes and stirs in the silicon polymer (trade name " SH4280 ", by Dow Corning Toray Silicone Co., Ltd. makes) in 100 parts, with the preparation pressure sensitive adhesive compositions.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 170 ℃ of following dried 5 minutes be the formation of pressure-sensitive adhesive layer of 25 μ m so that form thickness.This formation of pressure-sensitive adhesive layer is transferred to both sides as the Japan paper of porous substrate.Thereby, make and comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet of its base material.Then, a side of double-faced pressure-sensitive adhesive sheet is sticked on the aluminium sheet, to make the fixed head that its surface has formation of pressure-sensitive adhesive layer.
Embodiment 3
The acrylic acid 2-hydroxy methacrylate of 100 parts 2-EHAs and 2 parts is carried out polymerisation in solution to be handled, simultaneously under nitrogen replacement and 60-80 ℃, in the trimethylolpropane triacrylate (crosslinking agent) of the benzoyl peroxide of 210 parts toluene and 0.2 part and 0.01 part, stir, thereby make about 120 pools of viscosity, aggregate rate is 99.2%, and solid content is the pressure-sensitive adhesive agent solution of 30.0 weight %.In 100 parts of these solution, add 5 parts of crosslinking agents (trade name " Coronate L ", by Nippon Polyurethane Industry Co., Ltd. makes) and mixing based on isocyanates, make pressure sensitive adhesive compositions.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 40 ℃ of following dried 5 minutes, and 130 ℃ of further dried 5 minutes down, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to rayon fiber nonwoven fabrics as porous substrate, and (weight per unit area is 23g/m 2) both sides.Thereby, make and comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet of its base material.Then, a side of double-faced pressure-sensitive adhesive sheet is sticked on the aluminium sheet, thereby make the fixed head that has formation of pressure-sensitive adhesive layer on its surface.
Comparative Examples 1
With aluminium sheet as fixed head.In other words, different with embodiment 1 to 3, only constitute according to the fixed head of Comparative Examples 1, and its surface does not have viscosity by aluminium sheet.
Estimate I
Each fixed head according to embodiment 1 to 3 and Comparative Examples 1, measure the fixedly required time of FPC by following method, gap when pasting FPC on the fixed head between FPC and the fixed head, and remove the required time of FPC, so that estimate machinability and the stationary state of FPC.
Fixing required time of FPC
Each fixed head for embodiment 1 to 3, shown in Figure 1A and 1B, six FPC are arranged in its surface respectively to have on the fixed head of formation of pressure-sensitive adhesive layer, be placed on then on the formation of pressure-sensitive adhesive layer that is formed at the fixed head surface, and pressurize with hand, so that combine with formation of pressure-sensitive adhesive layer.Thereby FPC is fixed on the fixed head.
On the other hand,, shown in Figure 13 A and 13B, six FPC are arranged in respectively on the fixed head, are placed on the fixed head then for the fixed head of Comparative Examples 1.Gluing strap (being coated on a side of the base material that polyimides makes and the adhesive tape that obtains based on the pressure-sensitive adhesive of silicones) is sticked on four bights of each FPC.Thereby FPC is fixed on the fixed head.
Measurement is fixed on the time required on the fixed head (second) with FPC.Evaluation result is shown in table 1 " fixedly required time of the FPC " hurdle.
Gap between FPC and the fixed head
For measuring fixing FPC prepare and each fixed head that fixed FPC on it in the required time, measure the gap (mm) between each FPC and the fixed head, the gap (mm) when pasting FPC on the fixed head between each FPC and the fixed head to check.Evaluation result is shown in table 1 " gap between FPC and the fixed head " hurdle.
Remove the required time of FPC
Measured after the gap between each FPC and the fixed head, electronic unit has been installed on the FPC.After the installation, remove the FPC that electronic unit is housed with tweezers.Incidentally, for the fixed head of Comparative Examples 1, after having peeled off the gluing strap that sticks to four jiaos of each FPC, remove the FPC that electronic unit is housed with tweezers.
Measurement is removed the required time (second) of FPC from fixed head.Evaluation result is shown in table 1 hurdle of " removing the required time of FPC ".
Table 1
Embodiment Comparative Examples
????1 ????2 ????3 ????1
Fixing required time (second) of FPC ????30 ????30 ????30 ????120
Remove FPC required time (second) ????15 ????15 ????15 ????60
Gap between FPC and the fixed head (mm) ????0-0.1 ????0-0.1 ????0-0.1 ????0.5
As can be seen from Table 1, all have in the fixed head of formation of pressure-sensitive adhesive layer on each surface according to embodiment 1 to 3, the required time of required time and removal that adheres to is all very short, so machinability is good.In addition, the gap between each FPC and the fixed head is very little.Thereby FPC combines securely with fixed head, so can prevent the position transfer of FPC.
Embodiment 4
The acrylic acid of 100 parts 2-EHAs and 2 parts is carried out polymerisation in solution to be handled, simultaneously under 60-80 ℃ and nitrogen replacement, in the trimethylolpropane triacrylate (crosslinking agent) of the benzoyl peroxide of 210 parts toluene and 0.2 part and 0.01 part, stir, thereby make about 120 pools of viscosity, aggregate rate is 99.2%, and solid content is the pressure-sensitive adhesive agent solution of 30.0 weight %.In 100 parts of these solution, add 0.5 part of crosslinking agent (trade name " Tetrad ", by Mitsubishi Gas ChemicalCompany, Inc. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on epoxy.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 40 ℃ of following dried 5 minutes, and in 130 ℃ of further dried 5 minutes down, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to rayon fiber nonwoven fabrics as porous substrate, and (weight per unit area is 23g/m 2) both sides.Thereby making with the porous substrate is the double-faced pressure-sensitive adhesive sheet of base material.Then, a surface of each double-faced pressure-sensitive adhesive sheet is sticked on FPC with the surperficial facing surfaces that electronic unit will be installed on.Thereby, make each and all pasted the FPC that FPC is fixed on the adhesive sheet on the fixed head.
Embodiment 5
With 2 parts benzoyl peroxide, and toluene mixes and stirs in the silicon polymer (trade name " SH4280 ", by Dow Corning Toray Silicone Co., Ltd. makes) in 100 parts, with the preparation pressure sensitive adhesive compositions.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 170 ℃ of following dried 5 minutes, be the formation of pressure-sensitive adhesive layer of 25 μ m to form thickness.This formation of pressure-sensitive adhesive layer is transferred to the both sides of aramid fibre (trade name " Nomex 411 " is made by DuPont Teijin Advanced Papers Limited) porous substrate as porous substrate.Thereby, make and comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet of base material.Then, a surface of each double-faced pressure-sensitive adhesive sheet is pasted by the mode identical with embodiment 4.Thereby, make and pasted the FPC that is used for FPC is fixed on the adhesive sheet on the fixed head on it.
Comparative Examples 2
Use the FPC that does not paste adhesive sheet.In other words, different with embodiment 4 and 5, each FPC of Comparative Examples 2 is only made by FPC, and adhesive sheet is not pasted on its surface.
Estimate II
According to embodiment 4 and 5 and the FPC of Comparative Examples 2, by following method measurement adhesive sheet is sticked on FPC and go up the required time, FPC is fixed on the time required on the fixed head, remove the required time of FPC from fixed head, peel off the required time of adhesive sheet from FPC, gap when sticking on FPC on the fixed head between each FPC and the fixed head, the outward appearance of adhesive sheet after the IR heating, and the removeability of adhesive sheet, so that to machinability, the stationary state of FPC etc. is estimated.
Adhesive sheet is sticked to FPC go up the required time
In embodiment 4 and 5, when preparation has been pasted on it when being used for that FPC is fixed on the FPC of the adhesive sheet on the fixed head, with the prepared porous substrate that comprises is that a surface of each double-faced pressure-sensitive adhesive sheet of base material sticks on the surface of corresponding FPC, and the surface of described FPC is relative with its another surface that electronic unit will be installed.Measurement sticks on FPC with adhesive sheet and goes up the required time (second).Evaluation result is shown in table 2 " stickup required time of the adhesive sheet " hurdle.
Fixing FPC required time to the fixed head
FPC to the pressure-sensitive adhesive lamella of having pasted embodiment 4 and 5 thereon shown in Fig. 2 A and 2B, is arranged in 6 FPC respectively on the fixed head, is placed on fixed head then, and exerts pressure by hand, so that it is combined.Thereby FPC is fixed on the fixed head.
On the other hand,, shown in Figure 13 A and 13B, 6 FPC are arranged in respectively on the fixed head, are placed on fixed head then for the FPC of Comparative Examples 2.Gluing strap (being coated on a side of the base material that polyimides makes and the adhesive tape that obtains based on the pressure-sensitive adhesive of silicones) is sticked on four bights of each FPC.Thereby FPC is fixed on the fixed head.
Measurement is fixed on the time required on the fixed head (second) with FPC.Evaluation result is shown in table 2 " fixedly required time of the FPC " hurdle.
Remove the required time of FPC from fixed head
According to embodiment 4 and 5 and after the FPC of Comparative Examples 2 is fixed on the fixed head, electronic unit is installed on the FPC.After the installation, remove the FPC that electronic unit is housed with tweezers.Incidentally,, peel off the gluing strap that sticks on four jiaos of each FPC, remove the FPC that electronic unit is housed with tweezers then for the FPC of Comparative Examples 2.
Measurement is removed FPC required time (second) from fixed head.Evaluation result is shown in table 2 hurdle of " removing the required time of FPC ".
Peel off the required time of adhesive sheet from FPC
To be used for FPC is fixed on each FPC that adhesive sheet on the fixed head is laminated to embodiment 4 and 5.And then, measure and peel off the required time of adhesive sheet (second) from FPC.Evaluation result is shown in table 2 hurdle of " peeling off the required time of adhesive sheet ".
Gap when FPC pastes on the fixed head between FPC and the fixed head
According to measure FPC is fixed on prepare in the time required on the fixed head and be fixed on FPC on the fixed head, measure the gap (mm) between each FPC and the fixed head, so that check gap (mm) between each FPC and the fixed head when sticking on FPC on the fixed head.Evaluation result is shown in table 2 " gap between FPC and the fixed head " hurdle.
The outward appearance of adhesive sheet after the IR heating
In embodiment 4 and 5 and after the FPC of Comparative Examples 2 is fixed on the fixed head, electronic unit is installed on each FPC.After the installation, by the outward appearance of visual observation adhesive sheet.Incidentally, IR heating (based on ultrared heating) is carried out when mounted.Evaluation result is shown in table 2 " outward appearance of the adhesive sheet " hurdle.
The removeability of adhesive sheet
Peel off adhesive sheet the required time from FPC measuring, the removeability of check adhesive sheet from each FPC.Evaluation result is shown in table 2 " removeability of the adhesive sheet " hurdle.
Table 2
Embodiment 4 Embodiment 5 Comparative Examples 2
Adhere to the required time (second) of adhesive sheet ????30 ????30 ?????-
Fixing required time (second) of FPC ????20 ????20 ????120
Remove FPC required time (second) ????10 ????10 ????60
Peel off the required time of adhesive sheet (second) ????20 ????20 ?????-
Needed total time (second) ????80 ????80 ????180
Gap between FPC and the fixed head (mm) ????＜0.1 ????＜0.1 ????0.5
The outward appearance of adhesive sheet Well Well ?????-
The removeability of adhesive sheet Well Well ?????-
As can be seen from Table 2, when having adhered to the FPC of pressure-sensitive adhesive film on using its of embodiment 4 and 5, required total time is as sticking to FPC the required time of fixed head and removing the required time of FPC from fixed head, can shorten widely, so highly processable.In addition, the gap between each FPC and the fixed head is very little.Thereby FPC combines securely with fixed head, thereby prevents the transfer of FPC position.Therefore, electronic unit can excellent accuracy be installed on the FPC.
Embodiment 6
Acrylic rubber (trade name " Rheocoat R5000 ", by Toray Coatex Co., Ltd. makes) is dissolved in toluene, and the content that makes base polymer is the solution of 15 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mixing based on isocyanates, make pressure sensitive adhesive compositions.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 130 ℃ of following dried 5 minutes, be the formation of pressure-sensitive adhesive layer of 50 μ m thereby form thickness.This formation of pressure-sensitive adhesive layer is transferred to aramid fibre as porous substrate, and (trade name " Nomex " is by E.I.DuPont de Nemours﹠amp; Co. manufacturing) the both sides of porous substrate.Thereby, make and comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet of its base material.
Embodiment 7
2-EHA with 50 parts, 50 parts ethyl acrylate, the acrylic acid 2-hydroxy methacrylate of 5 parts methyl methacrylate and 5 parts carries out polymerisation in solution to be handled, simultaneously under 60-80 ℃ and nitrogen replacement in 2 of 210 parts toluene and 0.4 part, 2 '-stir in the azodiisobutyronitrile, thereby make about 120 pools of viscosity, aggregate rate is 99.2%, and solid content is the pressure-sensitive adhesive agent solution of 30.0 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by Nippon Polyurethane Industry Co., Ltd. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on isocyanates.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 40 ℃ of following dried 5 minutes, and, be the formation of pressure-sensitive adhesive layer of 50 μ m thereby form thickness 130 ℃ of further dried 5 minutes down.This formation of pressure-sensitive adhesive layer is transferred to rayon fiber as porous substrate, and (weight per unit area is 23g/m 2) the both sides of nonwoven fabrics.Thereby, make and comprise that porous substrate is the two-sided based on the sensitive adhesive sheet of its base material.
Embodiment 8
Acrylic rubber (trade name " Rheocoat R5000 ", by Toray Coatex Co., Ltd. makes) is dissolved in toluene, makes the solution that base polymer content is 15 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mixing, make pressure sensitive adhesive compositions based on isocyanates.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 130 ℃ of following dried 5 minutes, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to rayon fiber as porous substrate (quantitative 23g/m 2) the both sides of nonwoven fabrics.Thereby, make and comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet of its base material.
Embodiment 9
Will be by the different nonyl ester of 70 parts acrylic acid, 28 parts butyl acrylate, 2 of 2 parts acrylic acid and 0.1 part, the pre-composition that the 2-dimethoxy-2-phenyl acetophenone (Photoepolymerizationinitiater initiater) is made is exposed to ultraviolet ray under blanket of nitrogen, so that partly polymerization.Thereby, make the slurries that are coated with that viscosity about 300 is moored.In these slurries of 100 parts, add 0.4 part trimethylolpropane triacrylate (crosslinking agent) and mixing, make pressure sensitive adhesive compositions.Pressure sensitive adhesive compositions is applied on the spacer, then the 900mJ/cm that under blanket of nitrogen, produces with high-pressure mercury lamp 2Ultraviolet irradiation, light intensity is 5mW/cm 2, handle so that carry out photopolymerization.Then, with photopolymerisable pressure sensitive adhesive compositions in hot air dryer in 130 ℃ of following dried 5 minutes, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to rayon fiber as porous substrate, and (weight per unit area is 14g/m 2) side of nonwoven fabrics.
In addition, will be by 2 of the different nonyl ester of 100 parts acrylic acid and 0.3 part, the pre-composition that the 2-dimethoxy-2-phenyl acetophenone (Photoepolymerizationinitiater initiater) is made is exposed to ultraviolet ray under blanket of nitrogen, so that partly polymerization.Thereby, make the slurries that are coated with that viscosity about 200 is moored.In these slurries of 100 parts, add 0.2 part trimethylolpropane triacrylate (crosslinking agent) and mixing, make pressure sensitive adhesive compositions., pressure sensitive adhesive compositions directly be transferred to the surface of nonwoven fabrics side of rayon fiber nonwoven fabrics (porous substrate) on, this nonwoven fabrics shifted formation of pressure-sensitive adhesive layer with a side this surface opposite thereafter.The 900mJ/cm that the pressure sensitive adhesive compositions that is shifted is sent with high-pressure mercury lamp under blanket of nitrogen 2Ultraviolet irradiation, light intensity is 5mW/cm 2, handle so that carry out photopolymerization.Then, with photopolymerisable pressure sensitive adhesive compositions in hot air dryer in 130 ℃ of following dried 5 minutes.Comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet (sheet thickness 120 μ m) of its base material thereby make.
Embodiment 10
With 2 parts benzoyl peroxide, and toluene mixes and stirs in the silicon polymer (trade name " SH4280 ", by Dow Corning Toray Silicone Co., Ltd. makes) in 100 parts, with the preparation pressure sensitive adhesive compositions.Pressure sensitive adhesive compositions is applied on the spacer, then in hot air dryer in 170 ℃ of following dried 5 minutes, thereby form the formation of pressure-sensitive adhesive layer of thickness 25 μ m.This formation of pressure-sensitive adhesive layer is transferred to a side as the clay coated paper of porous substrate.
In addition, pressure sensitive adhesive compositions is coated on the opposite side of the side with having shifted formation of pressure-sensitive adhesive layer of clay coated paper.With the pressure sensitive adhesive compositions that shifted in hot air dryer in 170 ℃ of following dried 5 minutes.Thereby obtain comprising that porous substrate is the double-faced pressure-sensitive adhesive sheet (sheet thickness 120 μ m) of its base material.
Estimate III
The polyimide film (" Kapton 100H " that 25 μ m are thick, by DuPont-Toray Co., Ltd. make, usually as the base material of FPC) stick on the surface of each adhesive sheet of embodiment 6 to 10, and peel off spacer, thereby form a pressure-sensitive tape that 20mm is wide, 100mm is long.And then once coming and going by the 2kg roller, with formed pressure-sensitive tape as adherend be laminated to respectively with top employed similar each polyimide film and aluminium sheet on, in temperature is that 23 ℃, relative humidity are under 50% the condition aging 30 minutes, and heats (IR heating) with infrared ray.Thereafter, measure 90 ° of peel adhesion strength (viscosity), the protrusion that IR when heating produces/peel off (preventing during the IR heating protrusion/stripping performance), the easiness of peeling off (removeability), and damage as distortion or the bending (preventing when from peeling off damaged performance) of FPC when peeling off FPC, and estimate by following method.The results are shown in the table 3.
90 ° of adhesions of peeling off
For the pressure-sensitive tape that sticks on polyimide film or the aluminium sheet, preparation temperature be 23 ℃, relative humidity be under 50% the condition aging 30 minutes pressure-sensitive tape (initially) and after aging with infrared ray heating (IR heating) pressure-sensitive tape (IR heat after).According to these adhesive tapes, be that 23 ℃, relative humidity are under 50% the condition in temperature, by tensile machine,, and then estimate the viscosity of these adhesive tapes with 90 ° of peel strengths of 300mm/ minute tachometric survey (N/20mm).Incidentally, evaluation result is shown in Table 3 corresponding in " polyimides " on " 90 ° of peel adhesion strength " hurdle and " aluminium " hurdle " initially " and " after IR heats " in the hurdle.
The protrusion that produces during the IR heating/peel off
After the IR heating, by between visual observation polyimide film and the formation of pressure-sensitive adhesive layer and the protrusion that produces between aluminium sheet and the formation of pressure-sensitive adhesive layer/peel off, so that prevent protrusion/stripping performance when estimating the IR heating.Evaluation result is shown in table 3 " protrusion that the produces during the IR heating/peel off " hurdle.
Removeability
By peeling off thoughts and feelings, determine that polyimide film peels off easiness (removeability) as peel off easiness (removeability) and the pressure-sensitive tape of adherend when pressure-sensitive tape is peeled off when aluminium sheet is peeled off, and then estimate removeability with hand.Evaluation result is shown in Table 3 respectively corresponding in " polyimides " on " removeability " hurdle and " aluminium " hurdle " initially " and " after IR heats " in the hurdle.
Damage as distortion or the bending of FPC when peeling off FPC
After pressure-sensitive tape is peeled off, determine damages such as the distortion of FPC or bending at FPC by vision, so that estimate the anti-damageability when peeling off.Evaluation result is shown in table 3 " distortion/bending that takes place when the peeling off FPC " hurdle.
Table 3
Embodiment
??6 ??7 ??8 ??9 ??10
90 ° of adhesion strengths of peeling off (N/20mm) Polyimides Initially ??1.5 ??4.5 ??2.3 ??4.0 ??5.5
The IR heating ??1.6 ??4.8 ??2.5 ??4.2 ??5.5
Aluminium Initially ??1.6 ??5.5 ??2.5 ??5.5 ??5.5
The IR heating ??1.8 ??6.0 ??2.7 ??5.5 ??5.5
Removeability Polyimides Initially Well Well Well Well Well
The IR heating Well Well Well Well Well
Aluminium Initially Well Well Well Well Well
The IR heating Well Well Well Well Well
The protrusion that takes place during the IR heating/peel off Do not have Do not have Do not have Do not have Do not have
Distortion/the bending that takes place when peeling off FPC Do not have Do not have Do not have Do not have Do not have
As can be seen from Table 3, have removeability and the anti-protrusion/fissility when IR heats according to each pressure-sensitive tape of embodiment 6 to 10, this is the very important performance that is used for fixing the pressure-sensitive tape of FPC when being installed in electronic unit on the FPC.In addition, this pressure-sensitive tape can prevent FPC distortion or crooked when peeling off FPC, even still keeps the viscosity to FPC of appropriateness after the IR heating.
Embodiment 11
The acrylic acid of 97 parts 2-EHAs and 3 parts is carried out polymerisation in solution to be handled, simultaneously under 60-80 ℃ temperature and nitrogen replacement, stir in 2 of 210 parts toluene and 0.3 part, 2 '-azodiisobutyronitrile in, thereby make about 120 pools of viscosity, aggregate rate is 99.2%, and solid content is the pressure-sensitive adhesive agent solution of 32.3 weight %.In this solution of 100 parts, add 2 parts of crosslinking agents (trade name " Tetrad C ", by Mitsubishi Gas Chemical Company, Inc. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on epoxy.This pressure sensitive adhesive compositions is coated on the barrier paper, then in hot air dryer in 120 ℃ of following dried 3 minutes, thereby form the formation of pressure-sensitive adhesive layer of thick 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to neutral rayon fiber nonwoven fabrics as porous substrate, and (weight per unit area is 23g/m 2) a side, form the formation of pressure-sensitive adhesive layer of FPC-side.Thereby, make adhesive sheet with FPC-side pressure sensitive adhesive layer.
In addition, in 100 parts pressure-sensitive adhesive agent solution, add 0.5 part of crosslinking agent (trade name " Tetrad C ", by Mitsubishi Gas Chemical Company, Inc. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on epoxy.This pressure sensitive adhesive compositions is coated on the barrier paper, then in hot air dryer in 120 ℃ of following dried 3 minutes, thereby form the formation of pressure-sensitive adhesive layer of thick 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to opposite side to have on the surface of nonwoven fabrics side of adhesive sheet of FPC-side pressure sensitive adhesive layer.Thereby, making double-faced pressure-sensitive adhesive sheet, it has carrier board-side pressure sensitive adhesive layer and FPC-side pressure sensitive adhesive layer, and comprises that porous substrate is its base material.
Embodiment 12
In the pressure-sensitive adhesive agent solution of 100 parts embodiment 11, add 2 parts age resister (trade name " Irganox 1010 ", by Ciba-Geigy Ltd. make), make and contain ageing-resistant pressure-sensitive adhesive agent solution.Prepare double-faced pressure-sensitive adhesive sheet by the mode identical with embodiment 11, it has carrier board-side pressure sensitive adhesive layer and FPC-side pressure sensitive adhesive layer, and comprise that porous substrate is its base material, only be to use to contain ageing-resistant pressure-sensitive adhesive agent solution as the pressure-sensitive adhesive agent solution.
Embodiment 13
Prepare double-faced pressure-sensitive adhesive sheet by the mode identical with embodiment 11, it has carrier board-side pressure sensitive adhesive layer and FPC-side pressure sensitive adhesive layer, and comprise that porous substrate is its base material, (trade name " Nomex " is by E.I.DuPont de Nemours﹠amp only to be to use the aramid fibre porous substrate; Co. make) (weight per unit area is 23g/m to replace neutral rayon fiber nonwoven fabrics 2) as porous substrate.
Embodiment 14
Will be by 98 parts butyl acrylate, 2 of 2 parts acrylic acid and 0.1 part, the pre-composition that the 2-dimethoxy-2-phenyl acetophenone (Photoepolymerizationinitiater initiater) is made is exposed to ultraviolet ray under blanket of nitrogen, so that partly polymerization.Thereby making viscosity is the slurries that are coated with of about 300 pools.The trimethylolpropane triacrylate (crosslinking agent) and the mixing that add 0.4 part in these slurries of 100 parts make pressure sensitive adhesive compositions.This pressure sensitive adhesive compositions is coated on the barrier paper, then the 900mJ/cm that sends with high-pressure mercury lamp 2Ultraviolet ray under blanket of nitrogen, shine, light intensity is 5mW/cm 2, handle so that carry out photopolymerization.Then, with photopolymerisable pressure sensitive adhesive compositions in hot air dryer in 130 ℃ of following dried 5 minutes, and then form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.This formation of pressure-sensitive adhesive layer is transferred to rayon fiber nonwoven fabrics as porous substrate, and (weight per unit area is 14g/m 2) a side.
In addition, will be by 2 of the different nonyl ester of 100 parts acrylic acid and 0.3 part, the pre-composition that the 2-dimethoxy-2-phenyl acetophenone (Photoepolymerizationinitiater initiater) is made is exposed to ultraviolet ray under blanket of nitrogen, so that partly polymerization.Thereby make viscosity is the slurries that are coated with of about 200 pools.In these slurries of 100 parts, add 0.2 part trimethylolpropane triacrylate (crosslinking agent) and mixing, make pressure sensitive adhesive compositions.Thereafter, this pressure sensitive adhesive compositions directly being transferred to its opposite side has shifted on the surface of nonwoven fabrics side of rayon fiber nonwoven fabrics (porous substrate) of formation of pressure-sensitive adhesive layer.The 900mJ/cm that the pressure sensitive adhesive compositions that is shifted is sent with high-pressure mercury lamp 2Ultraviolet ray under blanket of nitrogen, shine, light intensity is 5mW/cm 2, handle so that carry out photopolymerization.Then, with photopolymerisable pressure sensitive adhesive compositions in hot air dryer in 130 ℃ of following dried 5 minutes.Comprise that porous substrate is the double-faced pressure-sensitive adhesive sheet (the thick 120 μ m of sheet) of its base material thereby make.
Estimate IV
Each adhesive sheet according to embodiment 11 to 14, measure the energy storage modulus of elasticity, tensile strength, 90 ° of peel adhesion strength, the picking up property of IR heating back FPC, IR heats the removeability of back adhesive sheet, the protrusion of appearance when reaching the IR heating/peel off (the anti-protrusion/fissility when IR heats), and estimate according to following method.The results are shown in the table 4.
The energy storage modulus of elasticity
Each pressure sensitive adhesive compositions (pressure sensitive adhesive compositions that FPC-side pressure sensitive adhesive layer comprises) that will prepare by the method for embodiment 11 to 14 is coated on the spacer, then in hot air dryer under predetermined temperature the dried preset time, make the formation of pressure-sensitive adhesive layer of thickness 100 μ m.This formation of pressure-sensitive adhesive layer is laminated on the porous substrate, makes the thick sheet material of about 1mm.This sheet material is die-cut into predetermined size, to form measuring samples.And then, use RheometricScientific according to formed sample, and " ARES " that Inc. makes measures energy storage modulus of elasticity (Pa), and measuring condition is a parallel-plate geometry, frequency 1Hz, and temperature 0 and 250 ℃.Incidentally, evaluation result is shown in table 4 " energy storage modulus of elasticity " hurdle.
Tensile strength
For deriving from embodiment 11 to 14 and be processed into each wide adhesive sheet of 20mm, preparation under 23 ℃ and 50% relative humidity aging 30 minutes adhesive sheet (initially) and wear out after heat the adhesive sheet (IR heat after) of (IR heating) through infrared ray.According to these adhesive sheets, measure fracture strength (N/15mm) by tensile machine, measuring condition is that the chuck distance is 100mm, speed is 300mm/ minute.Incidentally, after the IR heating that evaluation result is shown in Table 4 corresponding to " tensile strength " hurdle " initially " and " " in the hurdle.
90 ° of adhesions of peeling off
According to each adhesive sheet that derives from embodiment 11 to 14, the polyimide film (" Kapton 100H " that 25 μ m are thick, by DuPont-Toray Co., Ltd. make, usually as the base material of FPC) stick on a side of adhesive sheet, and peel off spacer, thereby form a long pressure-sensitive tape of the wide 100mm of 20mm.With pressure-sensitive tape as the roller of adherend by 2kg make a round trip make its stick on respectively to top used similar polyimide film and aluminium sheet on.Then, preparation pressure-sensitive tape (initially) of aging 30 minutes under 23 ℃ and 50% relative humidity, and heat the pressure-sensitive tape (IR heat after) of (IR heating) after aging through infrared ray.According to these adhesive tapes, measure 90 ° of peel strengths (N/20mm) by tensile machine, measuring condition is that speed is 300mm/ minute, temperature is 23 ℃, and relative humidity is 50%.Incidentally, evaluation result is shown in Table 4 respectively corresponding in " polyimides " on " 90 ° of peel adhesion strength " hurdle and " aluminium " hurdle " initially " with ", and IR heats " in the hurdle.
The picking up property of IR heating back FPC
Use the alumina supporter plate as carrier board.Shown in Figure 1A and 1B, six FPC are arranged on each carrier board, be placed on the formation of pressure-sensitive adhesive layer that is formed at the carrier board surface, and exert pressure so that it is combined with hand.Thereby FPC is fixed on the carrier board.Carry out IR heating thereafter.Peel off FPC from adhesive sheet immediately after the IR heating, and they are cooled to room temperature after, peel off FPC,, and be applied to the stress on the FPC so that by feeling that (feeling with feel) peel off easiness when determining to peel off FPC from adhesive sheet.And then the picking up property of evaluation FPC.Incidentally, evaluation result " after the IR heating immediately " that be shown in Table 4 corresponding to " the picking up property of IR heating back FPC " hurdle reaches in " being cooled to after the room temperature " hurdle.
The removeability of the adhesive sheet after the IR heating
After measuring the IR heating after the picking up property of FPC, when peeling off adhesive sheet, the alumina supporter plate peels off easiness (removeability) by sensation (feeling with feel) is definite.Estimate the removeability of adhesive sheet thus.Incidentally, in " removeability of adhesive sheet after the IR heating " hurdle that evaluation result is shown in Table 4 respectively.
The protrusion that produces during the IR heating/peel off
After IR heating in the measurement of the picking up property of FPC, in IR between the period of heating or afterwards, by the outward appearance vision, the protrusion that produces between observation adhesive sheet and the alumina supporter plate/peel off.Anti-protrusion/fissility when estimating the IR heating thus.Incidentally, evaluation result is shown in Table 4 in " protrusion that produces during the IR heating/peel off " hurdle.
Table 4
Embodiment
??11 ??12 ??13 ??14
Energy storage modulus of elasticity (* 10 5Pa) ????0℃ ??3.5 ??3.4 ??3.5 ??4.0
????300℃ ??4.2 ??4.2 ??4.2 ??4.2
Tensile strength (N/15mm) Initially ??12 ??12 ??39 ??12
After the IR heating ??9 ??11 ??40 ??9
90 ° of peel adhesion strength (N/20mm) Polyimides Initially ??2.0 ??2.0 ??1.8 ??3.5
After the IR heating ??1.7 ??1.9 ??1.6 ??3.3
Aluminium Initially ??3.5 ??3.6 ??3.4 ??5.8
After the IR heating ??3.8 ??3.8 ??3.7 ??5.9
The picking up property of FPC after the IR heating The IR heating immediately afterwards Well Well Well Well
Be cooled to after the room temperature Well Well Well Well
The removeability of adhesive sheet after the IR heating Well Well Well Well
The protrusion that produces during the IR heating/peel off Do not have Do not have Do not have Do not have
As can be seen from Table 4, in each adhesive sheet of embodiment 11 to 14, formation of pressure-sensitive adhesive layer has 10 at 0-300 ℃ 3-10 6Energy storage modulus of elasticity (the frequency: 1Hz) of Pa.Therefore, even carry out the IR heating, also can not take place in the formation of pressure-sensitive adhesive layer to degenerate etc., and the picking up property of FPC is good.In addition, because the tensile strength of adhesive sheet also is not less than 5N/15mm, so the removed life of adhesive sheet is also good.And owing to use the base material of porous substrate as adhesive sheet, this adhesive sheet has anti-protrusion/fissility when IR heats.Therefore, the adhesive sheet of embodiment 11 to 14 all has the picking up property of FPC, the removeability of adhesive sheet, the anti-protrusion/fissility when reaching the IR heating, this is when being installed in electronic unit on the FPC, as the fixing very important performance of the pressure-sensitive tape of FPC.
Embodiment 15
Acrylic rubber (trade name " Rheocoat R5000 ", by Toray Coatex Co., Ltd. makes) is dissolved in toluene, so that make the solution that base polymer content is 15 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on isocyanates.Utilize and pasted the spreader of spacing (pitch) on it for the pad of 2mm (spacer), this pressure sensitive adhesive compositions is coated on aramid fibre porous substrate as porous substrate, and (trade name " Nomex " is by E.I.DuPont de Nemours﹠amp; Co. both sides manufacturing).Then, with the pressure sensitive adhesive compositions that is coated with in hot air dryer in 130 ℃ of following dried 5 minutes be the formation of pressure-sensitive adhesive layer of 50 μ m so that form thickness.And then make and comprise that porous substrate is double-faced pressure-sensitive adhesive sheet (the adhesive tape thickness: 150 μ m) of its base material.Have in the double-faced pressure-sensitive adhesive sheet of base material at this, pressure-sensitive adhesive is the bar shaped coating, so have the formation of pressure-sensitive adhesive layer of linear protuberance in surface formation.
Then, the side with double-faced pressure-sensitive adhesive sheet pastes on the aluminium sheet.Make the fixed head that its surface has the formation of pressure-sensitive adhesive layer that comprises linear protuberance thus.
Embodiment 16
With 2 parts benzoyl peroxide, and toluene mixes and stirs in the silicon polymer (trade name " SH4280 ", by Dow Corning Toray Silicone Co., Ltd. makes) in 100 parts, with the preparation pressure sensitive adhesive compositions.Utilize and pasted the spreader of spacing on it, this pressure sensitive adhesive compositions is coated on the both sides of polyimide film base material (non-porous base material) for the pad of 2mm.Then, with the pressure sensitive adhesive compositions that is coated with in hot air dryer in 170 ℃ of following dried 5 minutes be the formation of pressure-sensitive adhesive layer of 50 μ m so that form thickness.Make double-faced pressure-sensitive adhesive sheet (adhesive tape thickness: 150 μ m) thus with base material.Have in the double-faced pressure-sensitive adhesive sheet of base material at this, pressure-sensitive adhesive is the bar shaped coating, so have the formation of pressure-sensitive adhesive layer of linear protuberance in surface formation.
Then, the side with double-faced pressure-sensitive adhesive sheet pastes on the aluminium sheet.Make the fixed head that its surface has the formation of pressure-sensitive adhesive layer that comprises linear protuberance thus.
Embodiment 17
The acrylic acid of 100 parts 2-EHAs and 2 parts is carried out polymerisation in solution to be handled, under 60-80 ℃ and nitrogen replacement, stir simultaneously in the trimethylolpropane triacrylate (crosslinking agent) of the benzoyl peroxide of 210 parts toluene and 0.2 part and 0.01 part, and then make viscosity about 120 the pool, aggregate rate is 99.2%, and solid content is the pressure-sensitive adhesive agent solution of 30.0 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mix, with the preparation pressure sensitive adhesive compositions based on isocyanates.Utilize and pasted the spreader of spacing on it, this pressure sensitive adhesive compositions is coated on the both sides of polyimide film base material (non-porous base material) for the pad of 2mm.Then, with the pressure sensitive adhesive compositions that is coated with in hot air dryer in 130 ℃ of following dried 5 minutes be the formation of pressure-sensitive adhesive layer of 50 μ m so that form thickness.Make double-faced pressure-sensitive adhesive sheet (adhesive tape thickness: 150 μ m) thus with base material.Have in the double-faced pressure-sensitive adhesive sheet of base material at this, pressure-sensitive adhesive is the bar shaped coating, so have the formation of pressure-sensitive adhesive layer of linear protuberance in surface formation.
Then, the side with double-faced pressure-sensitive adhesive sheet pastes on the aluminium sheet.Make the fixed head that its surface has the formation of pressure-sensitive adhesive layer that comprises linear protuberance thus.
Comparative Examples 3
Use aluminium sheet as fixed head.In other words, different with embodiment 15 to 17, the fixed head of Comparative Examples 3 is only made by aluminium sheet, and its surface does not form formation of pressure-sensitive adhesive layer.
Estimate V
Fixed head according to embodiment 15 to 17, measure the fixedly required time of FPC by following method, the required time of FPC is removed in the gap when pasting FPC on the fixed head between FPC and the fixed head, the protrusion that occurs when reaching the IR heating/peel off is so that estimate machinability and the stationary state of FPC.
Fixing required time of FPC
For each fixed head of embodiment 15 to 17, shown in Figure 1A and 1B, six FPC are arranged in a surface respectively have on the fixed head of formation of pressure-sensitive adhesive layer.Then, six FPC are placed on the formation of pressure-sensitive adhesive layer that is formed at the fixed head surface, and exert pressure, combine with formation of pressure-sensitive adhesive layer making it with hand.Thereby FPC is fixed on the fixed head.
On the other hand,, shown in Figure 13 A and 13B, 6 FPC are arranged in respectively on the fixed head, are placed on the fixed head then for the fixed head of Comparative Examples 3.Gluing strap (will be coated on a side of the base material that polyimides makes based on the pressure-sensitive adhesive of silicones and form adhesive tape) is sticked on four bights of each FPC.Thereby FPC is fixed on the fixed head.
Measurement is fixed on the time required on the fixed head (second) with FPC.Evaluation result is shown in table 5 " fixedly required time of the FPC " hurdle.
Gap between FPC and the fixed head
According to prepare and each fixed head that fixed FPC on it in the measurement of fixing FPC required time, measure the gap (mm) between each FPC and the fixed head, the gap (mm) when sticking on the fixed head between each FPC and the fixed head with check FPC.Evaluation result is shown in table 5 " gap between FPC and the fixed head " hurdle.
Remove the required time of FPC
After the gap of having measured between each FPC and the fixed head, electronic unit is installed on the FPC.After the installation, remove the FPC that electronic unit is housed with tweezers.Incidentally, for the fixed head of Comparative Examples 3, after the gluing strap of having peeled off attached to four jiaos of each FPC, remove the FPC that electronic unit is housed with tweezers.
Measurement is removed FPC required time (second) from fixed head.Evaluation result is shown in table 5 hurdle of " removing the required time of FPC ".
The protrusion that occurs during the IR heating/peel off
In addition, measured after the gap between each FPC and the fixed head, carried out the IR heating.After the IR heating, the protrusion by occurring between visual observation aluminium sheet and the formation of pressure-sensitive adhesive layer/peel off is so that the anti-protrusion/fissility when estimating the IR heating.Evaluation result is shown in table 5 " protrusion that the occurs during the IR heating/peel off " hurdle.
Table 5
Embodiment Comparative Examples
????15 ????16 ????17 ????3
Fixing required time (second) of FPC ????30 ????30 ????30 ????120
Remove FPC required time (second) ????15 ????15 ????15 ????60
Gap between FPC and the fixed head (mm) ????0-0.1 ????0-0.1 ????0-0.1 ????0.5
The protrusion that occurs during the IR heating/peel off Do not have Do not have Do not have Do not have
As can be seen from Table 5, formed in each fixed head of embodiment 15 to 17 of the formation of pressure-sensitive adhesive layer with linear protuberance on the surface, adhere to the required time and remove the required time very short, so highly processable.In addition, the gap between each FPC and the fixed head is very little.Thereby FPC combines securely with fixed head, the feasible position transfer that can prevent FPC.In addition, even carry out between aluminium sheet and formation of pressure-sensitive adhesive layer, also not occurring protruding/peeling off when IR heats, so FPC keeps being securely fixed on the fixed head.Anti-protrusion/fissility when the IR heating is provided thus.Therefore, electronic unit can be installed on the flexible print circuit by high accuracy.
Embodiment 18
Acrylic rubber (trade name " Rheocoat R5000 ", by Toray Coatex Co., Ltd. makes) is dissolved in toluene, so that make the solution that base polymer content is 15 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on isocyanates.This pressure sensitive adhesive compositions is coated on aramid fibre porous substrate as porous substrate, and (trade name " Nomex " is by E.I.DuPont de Nemours﹠amp; Co. both sides manufacturing).Then, with the pressure sensitive adhesive compositions that is coated with in hot air dryer in 130 ℃ of following dried 5 minutes, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.Make double-faced pressure-sensitive adhesive sheet (adhesive tape thickness: 150 μ m) thus with base material.In addition, double-faced pressure-sensitive adhesive sheet with base material is carried out punching press, comprise that porous substrate is its base material and (the adhesive tape thickness: 150 μ m) of the double-faced pressure-sensitive adhesive sheet with formation of pressure-sensitive adhesive layer thereby make, in described formation of pressure-sensitive adhesive layer, formed and penetrated into another surperficial hole (through hole) from a surface.
Then, the side with double-faced pressure-sensitive adhesive sheet sticks on the aluminium sheet.Make thus and have the fixed head that is formed at its surface and comprises the formation of pressure-sensitive adhesive layer of bore portion.
Embodiment 19
With 2 parts benzoyl peroxide, and toluene mixes and stirs in the silicon polymer (trade name " SH4280 ", by Dow Corning Toray Silicone Co., Ltd. makes) in 100 parts, with the preparation pressure sensitive adhesive compositions.This pressure sensitive adhesive compositions is coated on the both sides of polyimide film base material (non-porous base material), then in hot air dryer in 170 ℃ of following dried 5 minutes, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.Make double-faced pressure-sensitive adhesive sheet (adhesive tape thickness: 150 μ m) thus with base material.In addition, to having the double-faced pressure-sensitive adhesive sheet mechanical stamping of base material, comprise that porous substrate is its base material and (the adhesive tape thickness: 150 μ m) of the double-faced pressure-sensitive adhesive sheet with formation of pressure-sensitive adhesive layer thereby make, in described formation of pressure-sensitive adhesive layer, formed and penetrated into another surperficial hole (through hole) from a surface.
Then, the side with double-faced pressure-sensitive adhesive sheet sticks on the aluminium sheet.Make thus and have the fixed head that is formed at its surface and comprises the formation of pressure-sensitive adhesive layer of bore portion.
Embodiment 20
The acrylic acid of 100 parts 2-EHAs and 2 parts is carried out polymerisation in solution to be handled, under 60-80 ℃ and nitrogen replacement, stir simultaneously in the trimethylolpropane triacrylate (crosslinking agent) of the benzoyl peroxide of 210 parts toluene and 0.2 part and 0.01 part, thereby make about 120 pools of viscosity, aggregate rate is 99.2%, and solid content is the pressure-sensitive adhesive agent solution of 30.0 weight %.In this solution of 100 parts, add 5 parts of crosslinking agents (trade name " Coronate L ", by NipponPolyurethane Industry Co., Ltd. makes) and mixing, with the preparation pressure sensitive adhesive compositions based on isocyanates.This pressure sensitive adhesive compositions is coated on the both sides of polyimide film base material (non-porous base material), then in hot air dryer in 130 ℃ of following dried 5 minutes, thereby form the formation of pressure-sensitive adhesive layer of thickness 50 μ m.Make double-faced pressure-sensitive adhesive sheet (adhesive tape thickness: 150 μ m) thus with base material.In addition, to having the double-faced pressure-sensitive adhesive sheet mechanical stamping of base material, comprise that porous substrate is its base material and (the adhesive tape thickness: 150 μ m) of the double-faced pressure-sensitive adhesive sheet with formation of pressure-sensitive adhesive layer thereby make, in described formation of pressure-sensitive adhesive layer, formed and penetrated into another surperficial hole (through hole) from a surface.
Then, the side with double-faced pressure-sensitive adhesive sheet sticks on the aluminium sheet.Make thus and have the fixed head that is formed at its surface and comprises the formation of pressure-sensitive adhesive layer of bore portion.
Comparative Examples 4
Use aluminium sheet as fixed head.In other words, different with embodiment 18 to 20, the fixed head of Comparative Examples 4 does not only have the aluminium sheet of formation of pressure-sensitive adhesive layer to make by the surface.
Estimate VI
Each fixed head according to embodiment 18 to 20, measure the fixedly required time of FPC by the method identical with estimating V, gap when pasting FPC on the fixed head between FPC and the fixed head, remove the required time of FPC, the protrusion that occurs when reaching the IR heating/peel off is so that estimate machinability and the stationary state of FPC.The results are shown in the table 6.
Table 6
Embodiment Comparative Examples
????18 ????19 ????20 ????4
Fixing required time (second) of FPC ????30 ????30 ????30 ????120
Remove FPC required time (second) ????15 ????15 ????15 ????60
Gap between FPC and the fixed head (mm) ???0-0.1 ???0-0.1 ???0-0.1 ????0.5
The protrusion that occurs during the IR heating/peel off Do not have Do not have Do not have Do not have
As can be seen from Table 6, formed in the fixed head of embodiment 18 to 20 of formation of pressure-sensitive adhesive layer with hole portion on its surface, adhere to the required time and remove the required time all extremely short, so highly processable.In addition, the gap between each FPC and the fixed head is very little.Thereby FPC and fixed head combine securely, and move the feasible position of FPC that can prevent.In addition,, between aluminium sheet and formation of pressure-sensitive adhesive layer, do not produce yet and protrude/peel off, so FPC keeps being securely fixed on the fixed head even carry out the IR heating.Thereby, anti-protrusion/fissility when heating, IR is provided.Therefore, electronic unit can be installed on the flexible print circuit by high accuracy.
Although with reference to its specific embodiment in detail the present invention has been described in detail, those skilled in the art can it is evident that, can carry out various modifications and change to the present invention and do not break away from design of the present invention and scope.
The application is based on following Japanese patent application, and its content is incorporated herein by reference:
The Japanese patent application No.2001-119430 that submit to April 18 calendar year 2001;
The Japanese patent application No.2001-119431 that submit to April 18 calendar year 2001;
The Japanese patent application No.2001-151846 that submit to May 22 calendar year 2001;
The Japanese patent application No.2001-151850 that submit to May 22 calendar year 2001;
The Japanese patent application No.2001-151853 that submit to May 22 calendar year 2001; And
The Japanese patent application No.2001-176838 that submit to June 12 calendar year 2001.
＜industrial applicibility 〉
The method according to this invention sticks to flexible print circuit easily or peels off from fixed head, adheres to and peels off the required time so that can shorten. In addition, flexible print circuit can be securely fixed on the fixed head. Therefore, flexible print circuit can excellent machinability be attached to or peel off from fixed head. In addition, electronic unit can be installed on the flexible print circuit by high accuracy. Moreover, even flexible print circuit is heated when being installed in electronic unit on the flexible print circuit, also can suppress or prevent the reduction of viscosity.

Claims (43)

1. one kind is installed in method on the flexible print circuit with electronic unit, may further comprise the steps:
Surface at fixed head forms formation of pressure-sensitive adhesive layer;
Flexible print circuit is fixed on described surface with fixed head of formation of pressure-sensitive adhesive layer; And
Electronic unit is installed on the surface of described flexible print circuit.
2. according to the method on the flexible print circuit that electronic unit is installed in of claim 1, further comprising the steps of:
On all surface of described fixed head, form formation of pressure-sensitive adhesive layer.
3. according to the method on the flexible print circuit that electronic unit is installed in of claim 1, further comprising the steps of:
Only want the part of fixing flexible printed circuit to form formation of pressure-sensitive adhesive layer on described fixed head surface.
4. according to the method on the flexible print circuit that electronic unit is installed in of claim 1, further comprising the steps of:
Attached on the described fixed head, this adhesive sheet has at least one side that base material and described formation of pressure-sensitive adhesive layer are positioned at this base material with adhesive sheet, this formation of pressure-sensitive adhesive layer be positioned at described fixed head facing surfaces on.
5. according to the method on the flexible print circuit that electronic unit is installed in of claim 4, further comprising the steps of:
Form a plurality of protuberances on the surface of described formation of pressure-sensitive adhesive layer.
6. according to the method on the flexible print circuit that electronic unit is installed in of claim 5, further comprising the steps of:
Form described a plurality of protuberances on neutral line ground, the plane of described adhesive sheet.
7. according to the method on the flexible print circuit that electronic unit is installed in of claim 6, further comprising the steps of:
Form described linear protuberance by the striped coating.
8. according to the method on the flexible print circuit that electronic unit is installed in of claim 4, further comprising the steps of:
The a plurality of hole of formation portion in the surface of described formation of pressure-sensitive adhesive layer.
9. method on the flexible print circuit that electronic unit is installed in according to Claim 8, further comprising the steps of:
Form described hole portion by punching press.
10. according to the method on the flexible print circuit that electronic unit is installed in of claim 4, wherein:
Described adhesive sheet has base material, and described formation of pressure-sensitive adhesive layer is positioned at the both sides of this base material.
11. according to the method on the flexible print circuit that electronic unit is installed in of claim 4, wherein:
This base material is a porous substrate.
12. according to the method on the flexible print circuit that electronic unit is installed in of claim 1, wherein:
The pressure-sensitive adhesive that forms described formation of pressure-sensitive adhesive layer is for based on the pressure-sensitive adhesive of acrylic compounds and at least a based in the pressure-sensitive adhesive of silicones.
13. one kind is installed in method on the flexible print circuit with electronic unit, may further comprise the steps:
Adhesive sheet is bonded on the reverse side on the surface that electronic unit will be installed on the flexible print circuit;
By described adhesive sheet, described flexible print circuit is fixed on the fixed head; And
Electronic unit is installed on the surface of described flexible print circuit.
14. the method on the flexible print circuit that electronic unit is installed in according to claim 13 may further comprise the steps:
Described adhesive sheet is bonded on the flexible print circuit, and described adhesive sheet has the both sides that base material and formation of pressure-sensitive adhesive layer are positioned at this base material.
15. the method on the flexible print circuit that electronic unit is installed in according to claim 14 may further comprise the steps:
On the surface of described formation of pressure-sensitive adhesive layer, form a plurality of protuberances.
16., further comprising the steps of according to the method on the flexible print circuit that electronic unit is installed in of claim 15:
Form a plurality of protuberances on neutral line ground, the plane of described adhesive sheet.
17., further comprising the steps of according to the method on the flexible print circuit that electronic unit is installed in of claim 16:
Form described linear protuberance by the striped coating.
18., further comprising the steps of according to the method on the flexible print circuit that electronic unit is installed in of claim 14:
The a plurality of hole of formation portion in the surface of described formation of pressure-sensitive adhesive layer.
19., further comprising the steps of according to the method on the flexible print circuit that electronic unit is installed in of claim 18:
Form described depressed part by punching press.
20. according to the method on the flexible print circuit that electronic unit is installed in of claim 14, wherein:
Described base material is a porous substrate.
21. according to the method on the flexible print circuit that electronic unit is installed in of claim 14, wherein:
The pressure-sensitive adhesive that forms described formation of pressure-sensitive adhesive layer is for based on the pressure-sensitive adhesive of acrylic compounds and at least a based in the pressure-sensitive adhesive of silicones.
22. an adhesive sheet, it is used for when electronic unit is installed on the flexible print circuit this flexible print circuit being fixed on fixed head, and described adhesive sheet comprises:
Porous substrate; And
Be formed at the formation of pressure-sensitive adhesive layer of at least one side of described porous substrate.
23. according to the adhesive sheet of claim 22, wherein:
Described porous substrate is made by fiber material.
24. according to the adhesive sheet of claim 22, wherein:
The pressure-sensitive adhesive that forms described formation of pressure-sensitive adhesive layer is for based on the pressure-sensitive adhesive of acrylic compounds and at least a based in the pressure-sensitive adhesive of silicones.
25. according to the adhesive sheet of claim 22, wherein:
Described formation of pressure-sensitive adhesive layer has a plurality of its lip-deep protuberances that are formed at.
26. according to the adhesive sheet of claim 25, wherein:
Described protuberance is formed in the plane of described adhesive sheet linearly.
27. according to the adhesive sheet of claim 26, wherein:
Described linear protuberance forms by the striped coating.
28. according to the adhesive sheet of claim 22, wherein:
Described formation of pressure-sensitive adhesive layer has a plurality of depressed parts that are formed in its surface.
29. according to the adhesive sheet of claim 28, wherein:
Described a plurality of hole portion forms by punching press.
30. according to the adhesive sheet of claim 22, wherein:
Described porous substrate has the fusing point that is not less than 290 ℃.
31. according to the adhesive sheet of claim 22, wherein:
Energy storage modulus of elasticity in the described formation of pressure-sensitive adhesive layer is that 1Hz and temperature are to be 10 under 0-300 ℃ the situation in frequency 3-10 6Pa.
32. according to the adhesive sheet of claim 22, wherein:
The tensile strength of described adhesive sheet is not less than 5N/15mm.
33. an adhesive sheet, it is used for when electronic unit is installed on the flexible print circuit this flexible print circuit being fixed on fixed head, and described adhesive sheet comprises:
Base material; And
Be formed at the formation of pressure-sensitive adhesive layer of at least one side of described base material, it is that 1Hz and temperature are to have 10 under 0-300 ℃ the situation in frequency 3-10 6The energy storage modulus of elasticity of Pa.
34. according to the adhesive sheet of claim 33, wherein:
The tensile strength of described adhesive sheet is not less than 5N/15mm.
35. according to the adhesive sheet of claim 33, wherein:
Described base material is a porous substrate.
36. according to the adhesive sheet of claim 35, wherein:
Described porous substrate is made by fiber material.
37. according to the adhesive sheet of claim 33, wherein:
The pressure-sensitive adhesive that forms described formation of pressure-sensitive adhesive layer is for based on the pressure-sensitive adhesive of acrylic compounds and at least a based in the pressure-sensitive adhesive of silicones.
38. according to the adhesive sheet of claim 33, wherein:
Described formation of pressure-sensitive adhesive layer has a plurality of its lip-deep protuberances that are formed at.
39. according to the adhesive sheet of claim 38, wherein:
Described protuberance is formed in the plane of described adhesive sheet linearly.
40. according to the adhesive sheet of claim 39, wherein:
Described linear protuberance forms by the striped coating.
41. according to the adhesive sheet of claim 33, wherein:
Described formation of pressure-sensitive adhesive layer has a plurality of hole portions that are formed in its surface.
42. according to the adhesive sheet of claim 41, wherein:
Described a plurality of hole portion forms by punching press.
43. according to the adhesive sheet of claim 33, wherein:
Described base material has the fusing point that is not less than 290 ℃.
CNB02808439XA 2001-04-18 2002-04-11 Method for mounting electronic part on flexible printed wiring board and adhesive sheet for fixing flexible printed wiring board Expired - Fee Related CN100341391C (en)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP119431/2001 2001-04-18
JP119430/2001 2001-04-18
JP2001119430A JP2002309201A (en) 2001-04-18 2001-04-18 Adhesive sheet for fixing flexible print circuit board and containing method of electronic part on flexible print circuit board
JP2001119431A JP2002314240A (en) 2001-04-18 2001-04-18 Method for mounting electronic component to flexible printed wiring board
JP2001151846A JP2002338914A (en) 2001-05-22 2001-05-22 Adhesive sheet for fixing flexible printed circuit board and method for mounting electronic part on flexible printed circuit board
JP151846/2001 2001-05-22
JP151853/2001 2001-05-22
JP151850/2001 2001-05-22
JP2001151850A JP2002338915A (en) 2001-05-22 2001-05-22 Adhesive sheet for fixing flexible printed circuit board and method for mounting electronic part on flexible printed circuit board
JP2001151853A JP4766776B2 (en) 2001-05-22 2001-05-22 Adhesive sheet for fixing flexible printed wiring board and method for mounting electronic component on flexible printed wiring board
JP176838/2001 2001-06-12
JP2001176838A JP2002368497A (en) 2001-06-12 2001-06-12 Method for mounting electronic component to flexible printed-wiring board

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