WO2011062149A1 - 回路接続材料、それを用いた接続構造体及び仮圧着方法 - Google Patents
回路接続材料、それを用いた接続構造体及び仮圧着方法 Download PDFInfo
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- WO2011062149A1 WO2011062149A1 PCT/JP2010/070335 JP2010070335W WO2011062149A1 WO 2011062149 A1 WO2011062149 A1 WO 2011062149A1 JP 2010070335 W JP2010070335 W JP 2010070335W WO 2011062149 A1 WO2011062149 A1 WO 2011062149A1
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5046—Amines heterocyclic
- C08G59/5053—Amines heterocyclic containing only nitrogen as a heteroatom
- C08G59/5073—Amines heterocyclic containing only nitrogen as a heteroatom having two nitrogen atoms in the ring
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/22—Di-epoxy compounds
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Definitions
- the present invention relates to a circuit connection material, a connection structure using the same, and a temporary crimping method.
- thermosetting resin such as an epoxy resin having excellent adhesiveness and high reliability is used (for example, see Patent Document 1).
- a curing agent such as an epoxy resin, a phenol resin having reactivity with the epoxy resin, and a thermal latent catalyst for promoting the reaction between the epoxy resin and the curing agent are generally used.
- the heat latent catalyst is an important factor for determining the curing temperature and curing rate of the adhesive, and various compounds are used from the viewpoint of storage stability at room temperature and curing rate during heating.
- a radical curable adhesive composed of a radical polymerizable compound such as an acrylate derivative or a methacrylate derivative and a peroxide which is a radical polymerization initiator has attracted attention (for example, see Patent Document 2).
- the radical curable adhesive can be cured at a low temperature in a short time, the adhesiveness tends to depend on the surface state of the connecting member.
- a cationic polymerization type adhesive using an epoxy resin has been developed and put into practical use (for example, see Patent Document 3).
- adhesives using conventional epoxy resins tend to be inferior in temporary crimping properties when temporarily bonded to connecting members as compared to radical curing adhesives, and in particular, improve temporary crimping properties at low temperatures and in a short time. Is desired.
- an object of the present invention is to provide a circuit connection material that is sufficiently excellent in temporary bonding performance to a connection member at a low temperature in a short time, a connection structure using the circuit connection material, and a temporary bonding method.
- the present invention is a circuit connection material for electrically connecting opposing circuit electrodes, and includes (a) an epoxy resin, (b) a latent curing agent, (c) a film forming material, and (d) a carvone.
- a circuit connecting material containing a thermoplastic polymer containing an acid vinyl ester as a monomer unit.
- the circuit connecting material according to the present invention has the above-described configuration, and thus is sufficiently excellent in the temporary press bonding property to the connecting member at a low temperature and in a short time.
- temporary press bonding refers to a step of transferring an adhesive layer made of a circuit connecting material formed on a support film to a circuit member that is an adherend.
- the support film is peeled off and the adhesive layer is transferred onto the circuit member.
- curing may proceed due to heat at the time of temporary pressure bonding, and thus the heating temperature is limited.
- the circuit connection material is required to have both adhesion to the adherend and releasability from the support film. Therefore, the circuit connection material of the present invention contains the latent curing agent as the component (b) together with the epoxy resin as the component (a), so that the curing of the epoxy resin does not proceed at the time of temporary pressing, and the subsequent main connection Good connectivity can be exhibited.
- the resin component since it is necessary to melt the resin component to some extent by heating and temporarily bond it to the circuit member, it is temporarily crimped by containing a thermoplastic polymer containing carboxylic acid vinyl ester as a monomer unit as component (d). The component (d) can be melted and temporarily bonded to the circuit member at the heating temperature.
- the carboxylic acid vinyl ester is preferably vinyl acetate.
- the circuit connection material can further improve the temporary press-bonding property to the connection member at a low temperature in a short time.
- the latent curing agent is preferably a cationic polymerization type latent curing agent because the process at the time of this connection can be reduced in temperature and time, and the cationic polymerization type latent curing agent is preferable. Is more preferably an aromatic sulfonium salt.
- the circuit connection material of the present invention preferably further contains organic fine particles.
- the present invention also provides a first circuit member having a first substrate and a first circuit electrode formed on the main surface of the substrate, a second substrate and a first circuit member formed on the main surface of the substrate. Two circuit electrodes, the second circuit electrode and the first circuit electrode are arranged to face each other, and the second circuit electrode is electrically connected to the first circuit electrode.
- a connection structure including a second circuit member and a connection portion interposed between the first circuit member and the second circuit member, wherein the connection portion is a cured product of the circuit connection material of the present invention. To do.
- connection structure is a connection structure having a stable quality because the connection portion is formed using a circuit connection material that is excellent in low-temperature and short-time temporary bonding properties.
- the present invention further forms a film adhesive on a substrate and the main surface of the substrate, comprising a support film and an adhesive layer provided on one surface of the support film and made of the circuit connection material of the present invention.
- Provisional crimping method comprising a step of temporarily adhering to a circuit member having a circuit electrode formed at 80 ° C. or less, and a step of peeling a support film and transferring an adhesive layer to a main surface of a substrate after temporary adhesion To do.
- the adhesive layer can be transferred to the circuit member at a low temperature and in a short time, a connection structure having a stable adhesive force can be produced with high work efficiency.
- connection material that is sufficiently excellent in low-temperature and short-time temporary bonding properties to a connection member, a connection structure using the same, and a temporary bonding method.
- FIG. 1 is a cross-sectional view showing an embodiment of a circuit connecting material.
- a circuit connecting material 1 shown in FIG. 1 is composed of a resin layer 3 and a plurality of conductive particles 5 dispersed in the resin layer 3 and has a film shape.
- the resin layer 3 contains (a) an epoxy resin, (b) a latent curing agent, (c) a film forming material, and (d) a thermoplastic polymer containing a carboxylic acid vinyl ester as a monomer unit.
- the circuit connecting material 1 includes (a) an epoxy resin, (b) a latent curing agent, (c) a film-forming material, and (d) a thermoplastic polymer containing a carboxylic acid vinyl ester as a monomer unit, And conductive particles 5.
- a crosslinked structure is formed in the resin layer 3 by crosslinking of the epoxy resin, and a cured product of the circuit connection material 1 is formed.
- Epoxy resin is typically a bisphenol type epoxy resin that is a glycidyl ether of bisphenol such as bisphenol A, F, or AD, and an epoxy novolac resin derived from phenol novolac or cresol novolac. It is.
- Other examples include naphthalene type epoxy resins having a naphthalene skeleton, glycidylamine type epoxy resins, glycidyl ester type epoxy resins, alicyclic epoxy resins and heterocyclic epoxy resins. These are used individually or in mixture of 2 or more types.
- bisphenol type epoxy resins are preferred because they are widely available in grades with different molecular weights, and adhesiveness and reactivity can be arbitrarily set.
- bisphenol type epoxy resins bisphenol F type epoxy resins are particularly preferable.
- the viscosity of the bisphenol F type epoxy resin is low, and the fluidity of the circuit connecting material can be easily set in a wide range by using it in combination with the phenoxy resin.
- the bisphenol F type epoxy resin has an advantage that it is easy to impart good adhesiveness to the circuit connecting material.
- an epoxy resin having an impurity ion (Na + , Cl ⁇ etc.) concentration or hydrolyzable chlorine of 300 ppm or less to prevent electron migration.
- Latent curing agent (b) Any latent curing agent may be used as long as it can cure the epoxy resin.
- the latent curing agent may be a compound that reacts with the epoxy resin and is incorporated into the crosslinked structure, or may be a catalytic curing agent that accelerates the curing reaction of the epoxy resin. Both can be used in combination.
- catalytic curing agent examples include an anionic polymerization latent curing agent that promotes anionic polymerization of an epoxy resin and a cationic polymerization latent curing agent that promotes cationic polymerization of an epoxy resin.
- anionic polymerization type latent curing agent examples include imidazole series, hydrazide series, trifluoroboron-amine complex, amine imide, polyamine salt, dicyandiamide, and modified products thereof.
- the imidazole-based anionic polymerization latent curing agent is formed, for example, by adding imidazole or a derivative thereof to an epoxy resin.
- a photosensitive onium salt an aromatic diazonium salt, an aromatic sulfonium salt or the like is mainly used
- an aromatic diazonium salt an aromatic sulfonium salt or the like is mainly used
- an aromatic sulfonium salt that is activated by heating to cure the epoxy resin.
- This type of curing agent is preferable because it has a feature of fast curing.
- the compounding amount of the anionic polymerization type latent curing agent is preferably 30 to 60 parts by mass, more preferably 40 to 55 parts by mass with respect to 100 parts by mass of (a) epoxy resin. If it is less than 30 parts by mass, the clamping force on the adherend due to the curing shrinkage of the circuit connecting material is reduced. As a result, the contact between the conductive particles 5 and the circuit electrode is not maintained, and the connection resistance after the reliability test tends to increase. If it exceeds 60 parts by mass, the tightening force becomes too strong, so that the internal stress in the cured product of the circuit connecting material tends to increase, and the adhesive strength tends to decrease.
- the blending amount of the cationic polymerization type latent curing agent is preferably 3 to 15 parts by mass and more preferably 5 to 10 parts by mass with respect to 100 parts by mass of (a) epoxy resin. If it is less than 3 parts by mass, the clamping force on the adherend due to the curing shrinkage of the circuit connecting material is reduced. As a result, the contact between the conductive particles 5 and the circuit electrode is not maintained, and the connection resistance after the reliability test tends to increase. If it exceeds 15 parts by mass, the tightening force becomes too strong, so that the internal stress in the cured product of the circuit connecting material tends to increase, and the adhesive strength tends to decrease.
- Film-forming material means that when a liquid is solidified and the constituent composition is made into a film shape, the film is easy to handle and mechanical properties that do not easily tear, break, or stick. Etc., and can be handled as a film in a normal state (normal temperature and normal pressure).
- Examples of the film forming material include phenoxy resin, polyvinyl formal resin, polystyrene resin, polyvinyl butyral resin, polyester resin, polyamide resin, xylene resin, and polyurethane resin.
- a phenoxy resin is preferable because of excellent adhesiveness, compatibility, heat resistance, and mechanical strength.
- the phenoxy resin is a resin obtained by reacting a bifunctional phenol and epihalohydrin until they are polymerized, or by polyaddition of a bifunctional epoxy resin and a bifunctional phenol.
- the phenoxy resin contains 1 mol of a bifunctional phenol and 0.985 to 1.015 mol of epihalohydrin in the presence of a catalyst such as an alkali metal hydroxide at a temperature of 40 to 120 ° C. in a non-reactive solvent. It can be obtained by reacting.
- a catalyst such as an alkali metal compound, an organophosphorus compound, or a cyclic amine compound, an amide, ether, ketone, lactone, alcohol, or the like having a boiling point of 120 ° C. or higher.
- a product obtained by polyaddition reaction by heating to 50 to 200 ° C. in an organic solvent under a reaction solid content of 50% by mass or less is preferable.
- Bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, and bisphenol S type epoxy resin can be used as the bifunctional epoxy resin.
- Bifunctional phenols have two phenolic hydroxyl groups, and examples thereof include bisphenol compounds such as hydroquinones, bisphenol A, bisphenol F, bisphenol AD, and bisphenol S.
- the phenoxy resin may be modified with a radical polymerizable functional group.
- a phenoxy resin can be used individually by 1 type or in mixture of 2 or more types.
- the weight average molecular weight of the component (c) is preferably 10,000 or more from the viewpoint of film forming properties. However, when the weight average molecular weight of the thermoplastic resin is 1000000 or more, mixing with other components tends to be difficult.
- regulated by this application means the value determined based on the calibration curve by a standard polystyrene by the gel permeation chromatography method (GPC) of the following conditions.
- the compounding amount of the component (c) is preferably 50 to 140 parts by mass, more preferably 70 to 120 parts by mass with respect to a total of 100 parts by mass of the components (a) and (b).
- thermoplastic polymer as the component (d) is not particularly limited as long as it contains carboxylic acid vinyl ester as a monomer unit.
- the circuit connecting material of the present invention exhibits tackiness by melting (or softening) the component (d) at a predetermined heating temperature in the temporary press-bonding step, and can be easily temporarily bonded to the adherend.
- organic fine particles to be described later are added to the circuit connecting material for the purpose of improving adhesion, the tackiness may be slightly lowered and the temporary press bonding property may be lowered.
- the component (d) can function effectively in order to achieve both the tackiness and adhesiveness of the circuit connecting material.
- Examples of the vinyl carboxylate include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl myristate, vinyl valmitate, vinyl stearate, vinyl cyclohexylcarboxylate, and pivalic acid.
- Examples include vinyl, vinyl octylate and vinyl benzoate.
- vinyl acetate, vinyl propionate, vinyl butyrate, vinyl caproate, vinyl caprylate and vinyl laurate are preferable, and vinyl acetate is more preferable.
- thermoplastic polymer further effectively and reliably provides the effect of the present invention in that it has excellent temporary press-bonding properties by including, as a monomer unit, an olefin that is a nonpolar monomer unit together with a carboxylic acid vinyl ester that is a polar monomer unit. Can be expressed.
- olefins include ethylene and propylene.
- the thermoplastic polymer may contain a monomer copolymerizable with a carboxylic acid vinyl ester as long as it does not deviate from the effect of the present invention excellent in temporary press bonding at low temperatures.
- monomers include carboxylic acid allyl esters and (meth) acrylic acid alkyl esters, and specific examples include allyl acetate, methyl (meth) acrylate, and ethyl (meth) acrylate. .
- the proportion of the carboxylic acid vinyl ester is preferably 20% by mass or more and less than 60% by mass, and preferably 25% by mass or more and less than 55% by mass, based on 100% by mass of all monomers constituting the component (d). More preferably, it is more preferably 30% by mass or more and less than 50% by mass.
- the amount is 60% by mass or more, the resin exhibits adhesiveness at room temperature, and when forming a wound body of the circuit connection material, the resin is transferred to the back surface of the support film, and the workability tends to be inferior. If it is less than 20% by mass, the melting point of the resin itself increases, and the resin does not melt sufficiently in the temporary press-bonding step, and the effect of improving the adhesive strength tends to be difficult to obtain.
- the thermoplastic polymer contains an olefin-carboxylic acid vinyl ester copolymer as the thermoplastic polymer because it has excellent adhesion to the adherend during temporary pressure bonding and excellent support film releasability. From the viewpoint of compatibility with other resin components constituting the material, it is more preferable to include an ethylene-vinyl acetate ester copolymer.
- the component (d) has a weight average molecular weight (hereinafter referred to as “Mw”) of preferably 40000 to 150,000, more preferably 60000 to 130,000, and still more preferably 70000 to 120,000. If it exceeds 150,000, the solubility in general-purpose solvents such as toluene, ethyl acetate, or methyl ethyl ketone tends to decrease, and if it is less than 40000, the cohesive force of the resin layer 3 tends to decrease and the adhesive strength tends to decrease.
- Mw weight average molecular weight
- the component (d) preferably has a melting point of 30 ° C. or higher and lower than 80 ° C., more preferably 30 to 70 ° C. If the melting point is less than 30 ° C., it is easy to induce resin seepage during temporary pressure bonding, and workability tends to be reduced. On the other hand, when the melting point is 80 ° C. or higher, it is difficult to achieve the effect of the present invention that is excellent in temporary press bonding at low temperatures.
- the amount of component (d) is preferably 0.5 to 5 parts by mass, more preferably 1 to 3 parts by mass with respect to 100 parts by mass in total of components (a) and (c). . If the blending amount of the component (d) is less than 0.5 parts by mass, it tends to be difficult to achieve the effect of the present invention, which is excellent at the time of temporary pressure bonding at a low temperature. There is a tendency.
- Organic fine particles may be blended in the circuit connecting material according to the present invention as necessary.
- the organic fine particles have a function as an impact relaxation agent having stress relaxation properties.
- the organic fine particles By including the organic fine particles as the component (E) in the circuit connection material, it is possible to further improve the adhesion with various connection members in the main connection after the temporary pressure bonding.
- the adhesive strength to the adherend tends to be slightly inferior to the case where an anion polymerization type latent curing agent is used, (E) Adhesiveness can be improved by adding a component.
- organic fine particles examples include an acrylic resin, silicone resin, butadiene rubber, polyester, polyurethane, polyvinyl butyral, polyarylate, polymethyl methacrylate, acrylic rubber, polystyrene, NBR, SBR, a silicone-modified resin as a component. Is mentioned.
- organic fine particles include (meth) acrylic acid alkyl-butadiene-styrene copolymer, (meth) acrylic acid alkyl-silicone copolymer, silicone- (meth) acrylic copolymer, silicone and ( It is preferable to use a complex of (meth) acrylic acid, a complex of alkyl (meth) acrylate-butadiene-styrene and silicone, and a complex of alkyl (meth) acrylate and silicone.
- organic fine particles having a core-shell structure and having different compositions in the core layer and the shell layer can also be used.
- Specific examples of the core-shell type organic fine particles include particles obtained by grafting an acrylic resin with a silicone-acrylic rubber core, and particles obtained by grafting an acrylic resin on an acrylic copolymer.
- the blending amount is preferably 20 to 50 parts by mass, and more preferably 30 to 40 parts by mass with respect to 100 parts by mass of the component (a).
- the circuit connecting material 1 (resin layer 3) is composed of a filler, a softener, an accelerator, an anti-aging agent, a colorant, a flame retardant, a thixotropic agent, a coupling agent, a phenol resin, a melamine resin, and isocyanates. Can also be contained.
- a filler it is preferable because connection reliability and the like can be improved. If the maximum diameter of the filler is less than the particle diameter of the conductive particles 5, it can be used, and the blending amount is preferably in the range of 5 to 60% by volume. If it exceeds 60% by volume, the effect of improving reliability is saturated.
- the coupling agent a compound having a vinyl group, an acrylic group, an amino group, an epoxy group or an isocyanate group is preferable from the viewpoint of improving the adhesiveness.
- the conductive particles 5 include metal particles including metals such as Au, Ag, Ni, Cu, and solder, and carbon particles.
- the conductive particles 5 preferably have a surface layer made of Au, Ag, platinum group noble metals, more preferably Au. When the surface layer of the conductive particles 5 is made of these metals, a sufficient pot life can be obtained.
- the conductive particles 5 may be those in which the surface of a transition metal such as Ni is coated with a noble metal such as Au.
- the conductive layer described above may be formed by coating or the like on non-conductive glass, ceramic, plastic, or the like, and the outermost layer may be a noble metal.
- coated particles in which the outermost layer is a precious metal and the core is plastic or a hot-melt metal it is preferable because it has deformability by heating and pressurization, which increases the contact area with the electrode during connection and improves the reliability.
- the blending amount of the conductive particles is appropriately set depending on the application, but is usually in the range of 0.1 to 30 parts by volume with respect to 100 parts by volume of the component excluding the conductive particles in the circuit connecting material. In order to prevent an adjacent circuit from being short-circuited by excessive conductive particles, the amount is more preferably 0.1 to 10 parts by volume.
- the circuit connection material according to the present invention is not limited to the configuration shown in FIG.
- the circuit connection material may have a laminated structure composed of two or more layers having different compositions.
- the latent curing agent and the conductive particles may be included in separate layers. Thereby, the storage stability (pot life) of the circuit connecting material is improved.
- the circuit connecting material may not contain conductive particles.
- circuit connection material for example, chip components such as a semiconductor chip, a resistor chip, a capacitor chip, and circuit members having one or more circuit electrodes (connection terminals) such as a printed circuit board are connected. It is preferably used to form a connected structure.
- FIG. 2 is a cross-sectional view showing an embodiment of a connection structure.
- the connection structure 100 shown in FIG. 2 includes a first circuit member 10 having a first substrate 11 and a first circuit electrode 13 formed on the main surface of the first substrate 11, a second substrate 21, and a main body thereof.
- a second circuit member 20 having a second circuit electrode 23 formed on the surface and disposed so that the second circuit electrode 23 and the first circuit electrode 13 face each other; And a connecting portion 1a interposed between the member 10 and the second circuit member 20.
- the first circuit electrode 13 and the second circuit electrode 23 facing each other are electrically connected.
- connection part 1a is a cured product formed by curing the circuit connection material 1, and is composed of a cured resin layer 3a and conductive particles 5.
- the connection portion 1a bonds the first circuit member 10 and the second circuit member 20 so that the first circuit electrode 13 and the second circuit electrode 23 facing each other are electrically connected. .
- the opposing first circuit electrode 13 and second circuit electrode 23 are electrically connected via the conductive particles 5.
- the connection part does not contain conductive particles, the first circuit electrode 13 and the second circuit electrode 23 are directly bonded to each other so that electrical connection is possible.
- the first substrate 11 is a resin film containing at least one resin selected from the group consisting of polyester terephthalate, polyethersulfone, epoxy resin, acrylic resin and polyimide resin.
- the first circuit electrode 13 is formed of a material having conductivity that can function as an electrode (preferably at least one selected from the group consisting of gold, silver, tin, platinum group metals, and indium-tin oxide). Has been.
- the second substrate 21 is a glass substrate.
- the second circuit electrode is preferably formed from a transparent conductive material. Typically, ITO is used as the transparent conductive material.
- the circuit member connection structure 100 includes, for example, the first circuit member 10, the above-described film-like circuit connection material 1, and the second circuit member 20, and the first circuit electrode 13 and the second circuit.
- the first circuit member is configured so that the first circuit electrode 13 and the second circuit electrode 23 are electrically connected by heating and pressurizing the laminate laminated in this order so as to face the electrode 23. 10 and the second circuit member 20 are obtained.
- the circuit-connecting material 1 formed on the support film is temporarily bonded to the second circuit member 20 by heating and pressurizing the circuit-connecting material 1 while being bonded together, After peeling off the support film, the first circuit member 10 can be placed while aligning the circuit electrodes to prepare a laminate.
- produces by the heating in the case of a connection, it is preferable to heat-process a circuit member previously before a connection process.
- FIG. 3 is a process diagram showing a schematic cross-sectional view of one embodiment of a temporary press-bonding method using a circuit connecting material.
- a film-like adhesive 2 provided with a support film 7 and an adhesive layer 1b formed on one surface of the support film 7 and made of a film-like circuit connection material 1 is prepared (FIG. 3 (a)).
- the adhesive layer 1b is placed with the side of the second circuit member 20 facing the surface on which the circuit electrode 23 is formed, and the adhesive layer 1b is heated and pressed in the bonded state to apply the second adhesive layer 1b.
- the temperature for temporary bonding is 80 ° C. or lower, preferably 70 ° C. or lower, and more preferably 60 ° C. or lower.
- the lower limit of the temporary bonding temperature is not particularly limited, but is about 50 ° C. from the viewpoint of productivity.
- the temporary bonding time is appropriately adjusted depending on the bonding temperature, but it is preferably 0.1 to 5 seconds, more preferably 0.5 to 3 seconds.
- the support film 7 is peeled off, and the adhesive layer 1b is transferred onto the main surface of the second substrate 21 (FIG. 3C).
- the first circuit member 10 is directed to the first circuit electrode 13 toward the second circuit member 20.
- the connection structure 100 is obtained by heating and pressurizing the laminate formed on the adhesive layer 1b.
- the conditions for heating and pressurizing the laminate are appropriately adjusted according to the curability of the adhesive composition in the circuit connecting material so that the circuit connecting material is cured and sufficient adhesive strength is obtained.
- the adhesive layer 1b By heating the adhesive layer 1b, the adhesive layer 1b is cured in a state where the distance between the first circuit electrode 13 and the second circuit electrode 23 is sufficiently small, and the first circuit member 10 and the first circuit electrode 10 The second circuit member 20 is firmly connected via the connecting portion 1a.
- connection portion 1a is formed by curing the adhesive layer 1b, and a connection structure 100 as shown in FIG. 2 is obtained.
- the connection conditions are appropriately selected depending on the intended use, circuit connection material, and circuit member.
- the substrate included in the circuit member constituting the connection structure may be a semiconductor chip such as silicone and gallium / arsenic, and an insulating substrate such as glass, ceramics, glass / epoxy composite, and plastic.
- Each component which comprises the circuit connection material in a present Example is as follows.
- "EP-4010S” propylene oxide modified epoxy resin (epoxy equivalent 330-390, manufactured by ADEKA)
- YL983U” Bisphenol F type epoxy resin (epoxy equivalents 165 to 175, manufactured by Japan Epoxy Resin)
- BPA328 Acrylic fine particle dispersed epoxy resin (containing 17% by mass of acrylic fine particles, epoxy equivalent 220-240, manufactured by Nippon Shokubai)
- EP-1032H60 Cresol novolak type epoxy resin (epoxy equivalents 163 to 175)
- "HX3941HP” Anionic polymerization type latent curing agent-containing epoxy resin (Bisphenol F type and A type epoxy resin mixed type containing 35% by mass of imidazole microcapsule type curing agent, epoxy equivalent 160-190, manufactured by Asahi Kasei Chemicals)
- ZX1356-2 Bisphenol A / F copolymerization type phenoxy resin (Mw 50000, manufactured by To
- Example 3 A film-like circuit connection material was obtained in the same manner as in Example 1 except that “EV150” was used instead of “EV40W”.
- PKHC 20 parts by weight in terms of nonvolatile content
- acrylic rubber 200 parts by
- PKHC 15 parts by weight in terms of nonvolatile content
- Example 2 A film-like circuit connecting material was obtained in the same manner as in Example 2 except that “EV40W” was not added.
- composition of the circuit connection material prepared in the examples is shown in Table 1 in terms of parts by mass (in terms of non-volatile content), and the composition of the circuit connection material prepared in the comparative example is shown in Table 2 in terms of parts by mass (in terms of non-volatile content).
- the adhesive layer surface of the film-like circuit connecting material is formed on a 0.7 mm-thick glass plate having a thin layer of indium oxide (ITO) on the entire surface under conditions of 1 MPa at 60 ° C., 70 ° C. and 80 ° C., respectively. After temporarily bonding for 3 seconds or 3 seconds, the PET film was peeled off to evaluate the temporary press bonding property.
- Table 3 shows the evaluation results of the examples, and Table 4 shows the evaluation results of the comparative examples.
- the film-like circuit connecting material according to the present invention is sufficiently excellent in temporary press bonding properties even at a very low temperature and a short time of 60 ° C. for 1 second.
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Abstract
Description
(a)エポキシ樹脂としては、ビスフェノールA、F、AD等のビスフェノールのグリシジルエーテルであるビスフェノール型エポキシ樹脂及びフェノールノボラック又はクレゾールノボラックから誘導されるエポキシノボラック樹脂が代表的なエポキシ樹脂である。その他の例として、ナフタレン骨格を有するナフタレン型エポキシ樹脂、グリシジルアミン型エポキシ樹脂、グリシジルエステル型エポキシ樹脂、脂環式エポキシ樹脂及び複素環式エポキシ樹脂が挙げられる。これらは単独又は2種以上混合して用いられる。
(b)潜在性硬化剤としては、エポキシ樹脂を硬化させることができるものであればよい。また、潜在性硬化剤は、エポキシ樹脂と反応して架橋構造中に取り込まれる化合物であってもよいし、エポキシ樹脂の硬化反応を促進する触媒型硬化剤であってもよい。両者を併用することも可能である。
フィルム形成材とは、液状物を固形化し構成組成物をフィルム形状とした場合に、そのフィルムの取扱いを容易とし、容易に裂けたり、割れたり、べたついたりしない機械的特性等を付与するものであり、通常の状態(常温常圧)でフィルムとしての取扱いができるものである。
GPC条件
使用機器:日立L-6000 型((株)日立製作所)
カラム:ゲルパックGL-R420+ゲルパックGL-R430+ゲルパックGL-R
440(計3本)(日立化成工業(株)製商品名)
溶離液:テトラヒドロフラン
測定温度:40℃
流量:1.75mL/分
検出器:L-3300RI((株)日立製作所)
(d)成分である熱可塑性ポリマーとしては、カルボン酸ビニルエステルをモノマー単位として含むものであれば特に限定されない。本発明の回路接続材料は、仮圧着工程における所定の加熱温度において(d)成分が溶融(又は軟化)することで粘着性を示し、被着体へ容易に仮接着することができる。また、後述する(e)有機微粒子を接着性向上の目的で回路接続材料に添加する場合、粘着性がやや低下して仮圧着性が低下することがある。特にこの場合、(d)成分は、回路接続材料の粘着性と接着性とを両立するために有効に機能することができる。
本発明に係る回路接続材料には、必要に応じ有機微粒子を配合してもよい。有機微粒子は、応力緩和性を有する耐衝撃緩和剤としての機能を有するものである。回路接続材料が(E)成分として有機微粒子を含むことで、仮圧着後の本接続における各種接続部材との接着性をより一層向上することができる。特に、(b)成分としてカチオン重合型潜在性硬化剤を用いた回路接続材料の場合、被着体に対する接着強度がアニオン重合型潜在性硬化剤を用いた場合よりもやや劣る傾向があるため、(e)成分を添加することで接着性を改善することができる。
「EP-4010S」:プロピレンオキサイド変成エポキシ樹脂(エポキシ当量330~390、ADEKA製)
「YL983U」:ビスフェノールF型エポキシ樹脂(エポキシ当量165~175、ジャパンエポキシレジン製)
「BPA328」:アクリル微粒子分散型エポキシ樹脂(アクリル微粒子を17質量%含有、エポキシ当量220~240、日本触媒製)
「EP-1032H60」:クレゾールノボラック型エポキシ樹脂(エポキシ当量163~175)
「HX3941HP」:アニオン重合型潜在性硬化剤含有エポキシ樹脂(イミダゾール系マイクロカプセル型硬化剤を35質量%含有ビスフェノールF型及びA型エポキシ樹脂混合タイプ、エポキシ当量160~190、旭化成ケミカルズ製)
「ZX1356-2」:ビスフェノールA・F共重合型フェノキシ樹脂(Mw50000、東都化成製)
「PKHC」:ビスフェノールA型フェノキシ樹脂(Mw45000、インケム・コーポレーション製)
「アクリルゴムA」:ブチルアクリレート40質量部-エチルアクリレート30質量部―アクリロニトリル30質量部―グリシジルメタクリレート3質量部の共重合体(Mw約85万)
「EXL-2655」:有機微粒子(ブタジエン-スチレン-メタクリレート共重合体から形成されたコアシェルポリマー、ローム・アンド・ハース社製)
「EV40W」:エチレン-酢酸ビニル共重合体(酢酸ビニル含有率41%、Mw80000、融点40℃、メルトフローレート65g/10分、三井・デュポンポリケミカル製)
「EV150」:エチレン-酢酸ビニル共重合体(酢酸ビニル含有率33%、融点61℃、メルトフローレート30g/10分、Mw120000、三井・デュポンポリケミカル製)
「AUL-704」:平均粒径4μmのポリスチレン球状粒子の表面に0.1μmのNi層及びAu層を設けた導電性粒子(積水化学製)
「SH6040」:シランカップリング剤(γ-グリシドキシプロピルトリメトキシシラン、東レ・ダウコーニング・シリコーン(株)製)
「SI-60LA」:カチオン重合型潜在性硬化剤(芳香族スルホニウム塩、三新化学製)
「EP-4010S」30質量部、「YL983U」15質量部、「ZX1356-2」のトルエン/酢酸エチル(=50/50)40質量%溶液50質量部(不揮発分換算で20質量部)、「PKHC」のトルエン/酢酸エチル(=50/50)40質量%溶液50質量部(不揮発分換算で20質量部)、「EXL-2655」15質量部、「EV40W」の20質量%トルエン溶液10質量部(不揮発分換算で2質量部)、「AUL-704」4質量部、「SH6040」(γ-グリシドキシプロピルトリメトキシシラン、東レ・ダウコーニング・シリコーン(株)製)1質量部及び「SI-60LA」3質量部を配合して混合溶液を得た。得られた混合溶液をアプリケータでPETフィルム上に塗布し、70℃10分間の熱風乾燥により、接着剤層の厚み20μmであるフィルム状の回路接続材料を得た。
「YL983U」20質量部、「BPA328」30質量部、「PKHC」のトルエン/酢酸エチル(=50/50)40質量%溶液125質量部(不揮発分換算で50質量部)、「EV40W」の20質量%トルエン溶液10質量部(不揮発分換算で2質量部)、「AUL-704」4質量部、「SH6040」1質量部及び「SI-60LA」3質量部となるように各成分を配合した以外は実施例1と同様にして、フィルム状の回路接続材料を得た。
「EV40W」に変えて、「EV150」を用いた以外は、実施例1と同様にして、フィルム状の回路接続材料を得た。
「EP-1032H60」5質量部、「HX3941HP」35質量部、「PKHC」のトルエン/酢酸エチル(=50/50)40質量%溶液50質量部(不揮発分換算で20質量部)、「アクリルゴムA」のトルエン/酢酸エチル(=50/50)10質量%溶液200質量部(不揮発分換算で20質量部)、「EXL-2655」20質量部、「EV40W」の20質量%トルエン溶液10質量部(不揮発分換算で2質量部)、「AUL-704」4質量部及び「SH6040」1質量部となるように各成分を配合した以外は実施例1と同様にして、フィルム状の回路接続材料を得た。
「BPA328」10質量部、「HX3941HP」40質量部、「PKHC」のトルエン/酢酸エチル(=50/50)40質量%溶液37.5質量部(不揮発分換算で15質量部)、「アクリルゴムA」のトルエン/酢酸エチル(=50/50)10質量%溶液350質量部(不揮発分換算で35質量部)、「EV40W」の20質量%トルエン溶液10質量部(不揮発分換算で2質量部)、「AUL-704」4質量部及び「SH6040」1質量部となるように各成分を配合した以外は実施例1と同様にして、フィルム状の回路接続材料を得た。
「EV40W」を添加しなかった以外は、実施例1と同様にして、フィルム状の回路接続材料を得た。
「EV40W」を添加しなかった以外は、実施例2と同様にして、フィルム状の回路接続材料を得た。
「EV40W」を添加しなかった以外は、実施例4と同様にして、フィルム状の回路接続材料を得た。
「EV40W」を添加しなかった以外は、実施例5と同様にして、フィルム状の回路接続材料を得た。
上記フィルム状の回路接続材料の接着剤層面を、全面に酸化インジウム(ITO)の薄層を有する厚み0.7mmのガラス板に、それぞれ60℃、70℃、80℃で1MPaの条件で、1秒間又は3秒間仮接着した後PETフィルムを剥離することで、仮圧着性を評価した。接着剤層が均一にITO上に転写されている状態を「A」、接着剤層が部分的にITO上に転写されている状態を「B」、接着剤層がITO上に全く転写されない状態を「C」とした。実施例の評価結果を表3に、比較例の評価結果を表4に示す。
Claims (7)
- 対向する回路電極同士を電気的に接続する回路接続材料であって、
(a)エポキシ樹脂と、
(b)潜在性硬化剤と、
(c)フィルム形成材と、
(d)カルボン酸ビニルエステルをモノマー単位として含む熱可塑性ポリマーと、
を含有する回路接続材料。 - 前記カルボン酸ビニルエステルが酢酸ビニルである、請求項1記載の回路接続材料。
- 前記潜在性硬化剤がカチオン重合型潜在性硬化剤である、請求項1又は2記載の回路接続材料。
- 前記カチオン重合型潜在性硬化剤が芳香族スルホニウム塩を含む、請求項3記載の回路接続材料。
- 有機微粒子を更に含有する、請求項1~4のいずれか一項に記載の回路接続材料。
- 第一の基板及び該基板の主面上に形成された第一の回路電極を有する第一の回路部材と、
第二の基板及び該基板の主面上に形成された第二の回路電極を有し、該第二の回路電極と前記第一の回路電極とが対向するように配置され、該第二の回路電極が前記第一の回路電極と電気的に接続されている第二の回路部材と、
前記第一の回路部材及び前記第二の回路部材の間に介在する接続部と、
を備え、
前記接続部が、請求項1~5のいずれか一項に記載の回路接続材料の硬化物である、接続構造体。 - 支持フィルムと、該支持フィルムの一方面上に設けられ、請求項1~5のいずれか一項に記載の回路接続材料からなる接着剤層と、を備えるフィルム状接着剤を、基板及び該基板の主面上に形成された回路電極を有する回路部材に、80℃以下で仮接着する工程と、
前記仮接着後、前記支持フィルムを剥離して前記接着剤層を前記基板の主面に転写する工程と、
を備える仮圧着方法。
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