WO2014103637A1 - 接着剤、接着フィルム、半導体装置およびその製造方法 - Google Patents
接着剤、接着フィルム、半導体装置およびその製造方法 Download PDFInfo
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- WO2014103637A1 WO2014103637A1 PCT/JP2013/082559 JP2013082559W WO2014103637A1 WO 2014103637 A1 WO2014103637 A1 WO 2014103637A1 JP 2013082559 W JP2013082559 W JP 2013082559W WO 2014103637 A1 WO2014103637 A1 WO 2014103637A1
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- 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
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
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- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
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- H05K3/3489—Composition of fluxes; Methods of application thereof; Other methods of activating the contact surfaces
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Definitions
- the present invention relates to a case where a semiconductor chip such as an LSI, LED, or laser diode is bonded or directly electrically bonded to a circuit board such as a flexible substrate, a glass epoxy substrate, a glass substrate, a ceramic substrate, or a silicon interposer, or a semiconductor chip
- a semiconductor chip such as an LSI, LED, or laser diode
- a circuit board such as a flexible substrate, a glass epoxy substrate, a glass substrate, a ceramic substrate, or a silicon interposer, or a semiconductor chip
- the present invention relates to an adhesive used when bonding or laminating each other.
- a flux agent is used when soldering metal electrodes such as semiconductor chips and circuit boards.
- the main function of the fluxing agent is to clean the solder joints, prevent metal oxidation and increase solder wettability.
- rosin-based materials are known (for example, Patent Documents 4 and 5).
- JP 2004-319823 A Japanese Patent No. 3995022 JP 2009-277818 A JP 2001-219294 A JP 2005-059028 A
- an object of the present invention is to provide an adhesive having excellent storage stability under heating conditions of a heat drying process and a mounting process.
- the present invention is an adhesive containing (a) polyimide, (b) an epoxy compound, and (c) acid-modified rosin.
- the adhesive of the present invention is an adhesive containing (a) polyimide, (b) an epoxy compound, and (c) acid-modified rosin.
- the adhesive of the present invention is excellent in heat resistance and chemical resistance because it contains (a) polyimide.
- a polyimide contains at least one functional group having a high polarity selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group and a thiol group in the side chain of the polyimide.
- the organic solvent solubility of the polyimide and the epoxy resin is promoted during the heat treatment, so that a cured product having an even denser network structure can be obtained. it can.
- the method for synthesizing such a polyimide is not limited to the following examples.
- a diamine having a highly polar functional group such as a phenolic hydroxyl group, a sulfonic acid group, and a thiol group and an acid dianhydride are used.
- the polyimide precursor is synthesized by using a primary monoamine as a terminal blocking agent, followed by a terminal modification of the polyimide precursor, followed by a heat treatment at 150 ° C.
- the method of performing is mentioned.
- a diamine having a functional group was added to synthesize a terminal modified polyimide precursor, The method of performing polyimide ring closure at high temperature is mentioned.
- paintability of the adhesive varnish obtained improves that the (a) polyimide used for this invention is an organic solvent soluble polyimide which melt
- Solvents include ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone; ether solvents 1,4-dioxane, tetrahydrofuran, diglyme; glycol ether solvents methyl cellosolve, ethyl cellosolve, propylene glycol monomethyl Ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, diethylene glycol methyl ethyl ether; and other solvents such as benzyl alcohol, N-methylpyrrolidone, ⁇ -butyrolactone, ethyl acetate, and N, N-dimethylformamide.
- ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone
- a preferable example of polyimide has a structure represented by the general formula (2) or the general formula (3), and the structure represented by the general formula (1) is represented by the general formula (2) or the general formula ( The R 4 in 3) is contained in an amount of 5 to 15% by mass based on the total amount of the polymer.
- the total amount of the polymer (polyimide) obtained by the synthesis of the polyimide here means the mass of the polymer obtained by the polymerization of the constituent components consisting of diamine, acid dianhydride, and terminal blocking agent.
- the diamine, acid dianhydride, and terminal blocker that were charged excessively during the synthesis and did not become a polymer by polymerization are not included in the mass of the polyimide.
- R 1 represents a divalent hydrocarbon group, which may be the same or different in one molecule, and may be the same or different in different molecules.
- R 2 represents a monovalent hydrocarbon group, which may be the same or different in one molecule, and may be the same or different in different molecules.
- n represents an integer of 1 to 10.
- R 1 is preferably an alkylene group having 1 to 5 carbon atoms or a phenylene group.
- R 2 is preferably an alkyl group having 1 to 5 carbon atoms or a phenyl group.
- N is preferably 1 to 2.
- R 3 represents a tetra- to 14-valent organic group, which may be the same or different in one molecule, and may be the same or different in different molecules.
- R 4 represents a divalent to 12-valent organic group, and may be the same or different in one molecule, and may be the same or different in different molecules. Further, at least one of R 3 and R 4 is one or more selected from the group consisting of 1,1,1,3,3,3-hexafluoropropyl group, isopropyl group, ether group, thioether group and SO 2 group An aromatic group containing at least one group.
- R 5 and R 6 represent one or more groups selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group, and a thiol group, and may be the same or different in one molecule, and may be the same or different in different molecules. May be.
- X represents a monovalent organic group.
- m represents an integer of 8 to 200.
- the group selected from the group consisting of the 1,1,1,3,3,3-hexafluoropropyl group, isopropyl group, ether group, thioether group and SO 2 group is hereinafter referred to as “specific group”.
- R 3 represents a structural component of acid dianhydride, and among them, a C 4 to C 14 valent organic group is preferable.
- R 4 represents a structural component of diamine, and among them, a divalent to 12-valent organic group having 5 to 40 carbon atoms is preferable. Moreover, it is preferable that both R 3 and R 4 contain at least one specific group.
- R 5 is a substituent of R 3 and is selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group, and a thiol group.
- R 5 is derived from a substituent of the acid dianhydride used as a raw material.
- R 6 is a substituent of R 4 and is selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group, and a thiol group.
- R 6 is derived from a substituent of a diamine that is a raw material.
- the acid dianhydride used will be described.
- Specific examples of the acid dianhydride having at least one specific group include 2,2-bis (3,4-dicarboxyphenyl) propane dianhydride and 2,2-bis (2,3-di ().
- the acid dianhydride having at least one specific group and having at least one group selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group, and a thiol group include the following: Aromatic dianhydrides having the structure shown can be mentioned.
- R 9 represents C (CF 3 ) 2 , C (CH 3 ) 2 , SO 2 , S or O.
- R 10 and R 11 represent a hydrogen atom, a hydroxyl group, a thiol group, or a sulfonic acid group. However, R 10 and R 11 are not simultaneously hydrogen atoms.
- an acid dianhydride having no specific group and having at least one group selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group, and a thiol group specifically, the fragrance having the structure shown below Mention may be made of dianhydrides.
- R 7 and R 8 represent a hydrogen atom, a hydroxyl group, a thiol group or a sulfonic acid group. However, R 7 and R 8 are not simultaneously hydrogen atoms.
- acid dianhydride having no specific group and having no phenolic hydroxyl group, sulfonic acid group or thiol group include pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyl.
- these acid dianhydrides can be used alone or in combination of two or more.
- diamine having at least one specific group
- the diamine having at least one specific group include 3,4'-diaminodiphenyl sulfide, 4,4'-diaminodiphenyl sulfide, 3,4'-diaminodiphenyl ether, 4,4'- Diaminodiphenyl ether, 3,4'-diaminodiphenylsulfone, 4,4'-diaminodiphenylsulfone, bis (4-aminophenoxyphenyl) sulfone, bis (3-aminophenoxyphenyl) sulfone, bis (4-aminophenoxy) biphenyl, Bis ⁇ 4- (4-aminophenoxy) phenyl ⁇ ether, 1,4-bis (4-aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) benzene, 2,2-bis [4- (4 -Aminophenoxy) phenyl] hexaflu
- diamine having at least one specific group and having at least one group selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group, and a thiol group include 2,2-bis (3 -Amino-4-hydroxyphenyl) hexafluoropropane, 2,2-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 2,2-bis (3-amino-4-hydroxyphenyl) propane, 2, 2-bis (3-hydroxy-4-aminophenyl) propane, 3,3′-diamino-4,4′-dihydroxydiphenyl ether, 3,3′-diamino-4,4′-dihydroxydiphenylsulfone, 3,3 ′ -Diamino-4,4'-dihydroxydiphenyl sulfide or an aromatic ring thereof is an alkyl group or halogen atom In such or substituted compounds, and the like diamines having the structure shown below.
- R 16 represents C (CF 3 ) 2 , C (CH 3 ) 2 , SO 2 , S or O.
- R 17 and R 18 represent a hydrogen atom, a hydroxyl group, a thiol group or a sulfonic acid group. However, R 17 and R 18 are not simultaneously hydrogen atoms.
- diamine having no specific group and having at least one group selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group and a thiol group include 3,3′-diamino-4,4′- Dihydroxybiphenyl, 2,4-diamino-phenol, 2,5-diaminophenol, 1,4-diamino-2,5-dihydroxybenzene, diaminodihydroxypyrimidine, diaminodihydroxypyridine, hydroxydiaminopyrimidine, 9,9-bis (3 -Amino-4-hydroxyphenyl) fluorene, compounds in which these aromatic rings are substituted with an alkyl group or a halogen atom, and diamines having the structure shown below.
- R 12 to R 15 represent a hydrogen atom, a hydroxyl group, a thiol group, or a sulfonic acid group. However, R 12 and R 13 are not simultaneously hydrogen atoms.
- diamine having no specific group and having no phenolic hydroxyl group, sulfonic acid group, or thiol group examples include 3,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, benzidine, and m-phenylene.
- the structure represented by the general formula (1) may, for inclusion as R 4 in the general formula (2) and (3), a constituent of a diamine.
- Examples of the diamine having the structure represented by the general formula (1) include bis (3-aminopropyl) tetramethyldisiloxane and bis (p-amino-phenyl) octamethylpentasiloxane.
- R 5 and R 6 in the general formulas (2) and (3) By selecting R 5 and R 6 in the general formulas (2) and (3), the reaction rate between the polyimide and the epoxy compound when the adhesive is heat-treated is adjusted, and the crosslinking density of the cured product of the adhesive is adjusted. can do. This makes it possible to impart the required heat resistance and chemical resistance to the cured product of the adhesive.
- ⁇ and ⁇ each represent an integer of 0 to 10, and ⁇ + ⁇ is in the range of 0 to 10.
- 20 to 90 mol% of the total of R 5 and R 6 is preferably a group selected from the group consisting of a phenolic hydroxyl group, a sulfonic acid group and a thiol group.
- X represents a monovalent organic group and is a residue of a primary monoamine that is a terminal blocking agent.
- the primary monoamine include aliphatic monoamines, alicyclic monoamines, and aromatic monoamines. Of these, aromatic monoamines are preferred from the viewpoint of increasing the heat resistance of polyimide. These may be used alone or in combination of two or more.
- Specific examples of the primary monoamine include 5-aminoquinoline, 4-aminoquinoline, 3-aminonaphthalene, 2-aminonaphthalene, 1-aminonaphthalene, aniline and the like. Of these, aniline is preferably used.
- the primary monoamine it is preferable to use one having no other substituent capable of reacting with an epoxy compound.
- This makes it possible to obtain an organic solvent-soluble polyimide that does not have a substituent that reacts with the epoxy compound at the terminal portion of the polyimide having high molecular mobility. By using this, the reaction between the organic solvent-soluble polyimide and the epoxy compound hardly proceeds at room temperature, and the storage stability of the adhesive can be improved.
- the introduction ratio of the X component of the general formulas (2) and (3) is 0 with respect to 100 moles of all diamine residues contained in the polyimide when converted with the primary monoamine component of the terminal blocker which is the original component.
- the range of 1 to 60 mol is preferable, and the range of 5 to 50 mol is particularly preferable.
- m represents the number of polymer repetitions and represents an integer of 8 to 200. Preferably, it is an integer of 10 to 150.
- the weight average molecular weight measured by gel filtration chromatography is preferably 4000 to 80000, particularly preferably 8000 to 60000, in terms of polystyrene.
- the weight average molecular weight in terms of polystyrene is calculated with a GPC apparatus Waters 2690 (manufactured by Waters Co., Ltd.) using a polyimide solution having a solid content concentration of 0.1 mass% obtained by dissolving polyimide in N-methylpyrrolidone (NMP).
- GPC measurement conditions are such that the moving bed is NMP in which LiCl and phosphoric acid are dissolved at a concentration of 0.05 mol / L, and the development rate is 0.4 ml / min.
- Detector Waters 996 System controller: Waters 2690 Column oven: Waters HTR-B Thermo Controller: Waters TCM Column: TOSOH guard column Column: TOSOH TSK-GEL ⁇ -4000 Column: TOSOH TSK-GEL ⁇ -2500 and the like.
- the (a) polyimide used in the present invention may be only one having a structure represented by the general formulas (2) and (3), or a structure represented by the general formulas (2) and (3). In addition, it may be a copolymer having another structure as a copolymerization component or a mixture thereof. Furthermore, in addition to these polyimides, polyimides having other structures may be mixed. In that case, it is preferable that the polyimide which has a structure represented by General formula (2) and (3) is contained 50 mol% or more with respect to all the polyimides.
- the type and amount of the structure used for copolymerization or mixing are preferably selected within a range that does not impair the heat resistance of the heat resistant resin obtained by heat treatment.
- (A) Polyimide replaces part of the diamine with a terminal blocking agent that is a monoamine, or part of the acid dianhydride is a monocarboxylic acid, an acid anhydride, a monoacid chloride compound, or a monoactive ester compound. It replaces with a certain terminal blocker and synthesize
- a method of reacting a tetracarboxylic dianhydride and a diamine compound (partially replaced with a terminal blocking agent, which is a monoamine) at a low temperature a tetracarboxylic dianhydride (a part of an acid anhydride or a monoacid at a low temperature)
- a method of reacting a chloride compound or a mono-active ester compound with a terminal blocking agent) and a diamine compound, a diester is obtained by reaction of tetracarboxylic dianhydride and an alcohol, and then a diamine (a part of which is a monoamine)
- a method of reacting in the presence of a condensing agent and a reaction with tetracarboxylic dianhydride and an alcohol to obtain a diester, and then converting the remaining dicarboxylic acid into an acid chloride to obtain a diamine (partially with a monoamine).
- a polyimide precursor is obtained by utilizing a
- the structure of the general formula (1) introduced into the polymer and the structure derived from the end capping agent can be easily detected and quantified by the following method.
- the polymer in which the structure of the general formula (1) and the end-capping agent are introduced is dissolved in an acidic solution or a basic solution, and then decomposed into a diamine component and an acid anhydride component which are constituent units of the polymer.
- GC gas chromatography
- NMR nuclear magnetic resonance
- the structure of the general formula (1) is also used by directly measuring the pyrolysis gas chromatograph (PGC), infrared spectrum and 13 CNMR spectrum of the polyimide into which the end-capping agent is introduced. It is possible to easily detect and quantify the end-capping agent present.
- PPC pyrolysis gas chromatograph
- the content of (a) polyimide in the adhesive is preferably 15 to 90 parts by mass with respect to 100 parts by mass of (b) epoxy compound, and is 30 for reacting with the epoxy compound to form a dense network structure. More preferably, it is ⁇ 70 parts by mass.
- the adhesive of the present invention contains (b) an epoxy compound.
- (B) The epoxy compound reacts with (c) the acid-modified rosin or the polyimide side chain phenolic hydroxyl group, sulfonic acid group or thiol group to form a cured product having a high-density network structure.
- epoxy compounds are generally cured by a ring-opening reaction that does not cause shrinkage, shrinkage during curing of the adhesive can be reduced.
- As the epoxy compound those having two or more epoxy groups or those having an epoxy equivalent of 100 to 500 are preferable. By setting the epoxy equivalent to 100 or more, the toughness of the cured adhesive can be increased. By setting the epoxy equivalent to 500 or less, the cured adhesive can have a high-density network structure, and the cured adhesive can be made highly insulating.
- the (b) epoxy compound contains both a liquid epoxy compound and a solid epoxy compound, and the content ratio of the liquid epoxy compound is preferably 20% by mass or more and 70% by mass or less based on the total amount of the epoxy compound. More preferably, it is 30 mass% or more and 60 mass% or less.
- the adhesive contains the liquid epoxy compound in an amount within this range, it can have appropriate plasticity and flexibility as an adhesive for semiconductors.
- the liquid epoxy compound shows a viscosity of 150 Pa ⁇ s or less at 25 ° C. and 1.013 ⁇ 10 5 N / m 2
- the solid epoxy compound shows a viscosity exceeding 150 Pa ⁇ s at 25 ° C. Is.
- the liquid epoxy compound include JER (registered trademark) 828, JER (registered trademark) 1750, JER (registered trademark) 152, JER (registered trademark) 630, YL980 (trade name, manufactured by Mitsubishi Chemical Corporation), Epicron. (Registered trademark) HP-4032 (trade name, manufactured by DIC Corporation) and the like are exemplified, but not limited thereto. Moreover, you may use combining these 2 or more types.
- solid epoxy compound examples include JER (registered trademark) 1002, JER (registered trademark) 1001, YX4000H, JER (registered trademark) 4004P, JER (registered trademark) 5050, JER (registered trademark) 154, JER (registered trademark).
- the adhesive of the present invention contains (c) acid-modified rosin.
- Acid-modified rosins are raw rosins such as gum rosin, wood rosin, tall oil rosin, and unsaturated carboxylic acids such as (meth) acrylic acid, (anhydrous) maleic acid, fumaric acid, (anhydrous) citraconic acid, (anhydrous) itaconic acid, etc. Is obtained by Diels-Alder reaction (addition reaction).
- the raw material rosin is preferably purified by distillation, recrystallization, extraction, etc. to remove impurities such as metals and improve the resin color tone.
- the acid-modified rosin can be converted to an acid-modified rosin having a transparent color tone by hydrogenation. Examples of such acid-modified rosin include Pine Crystal (registered trademark) KE-604, Pine Crystal (registered trademark) KR-120, Marquide (registered trademark) No. 33 (above trade name, Arak
- the acid-modified rosins have two or more carboxyl groups.
- the acid-modified rosin is excellent in compatibility with (a) an organic solvent-soluble polyimide and (b) an epoxy compound. Moreover, it can react with an epoxy compound to form a network structure with high density.
- the acid-modified rosin has a bulky structure of rosin itself and a bulky cyclohexane ring generated by acid modification, which sterically hinders the reaction of the epoxy group to the carboxyl group, and heat-drys the adhesive. It is thought that the stability in the heating conditions of the processing and mounting process is enhanced.
- a temperature of 200 ° C. to 250 ° C. which is the curing temperature of the adhesive, the molecular mobility of the acid-modified rosin increases, the reaction with the epoxy compound proceeds quickly, and the curing of the adhesive is completed in a short time. can do.
- the content of (c) acid-modified rosin in the adhesive is preferably 5 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of (b) epoxy compound. By setting the content of the acid-modified rosin within this range, the adhesive can be cured and the adhesive can be cured in a short time.
- content of acid-modified rosin 20 mass parts or less are more preferable with respect to 100 mass parts of (b) epoxy compounds. The content is more preferably 10 parts by mass or more.
- the use of acid-modified rosin also has an effect of improving the adhesiveness with a metal material such as an electrode and imparting a flux function to the adhesive. That is, by electrically connecting the circuit members using the adhesive of the present invention, the joint is cleaned, and resin or inorganic particles that are components of the adhesive are mixed between the circuit members of the joint. It can prevent and improve the wettability of the solder.
- the acid-modified rosin is effective for both improving adhesiveness and improving the reliability of electrical connection.
- the acid group of the acid-modified rosin reacts with the epoxy compound during the curing reaction and is consumed, and the acid-modified rosin has a bulky structure. Corrosion of metal parts such as electrodes can be prevented.
- latent curing agents other than acid-modified rosin may be used in combination.
- the basic latent curing agent exhibits an interaction force with the acid-modified rosin, the potential can be further increased.
- an imidazole-based latent curing agent can be preferably used.
- the adhesive of the present invention may further contain (d) inorganic particles.
- D As the material of the inorganic particles, silica, alumina, titania, silicon nitride, boron nitride, aluminum nitride, iron oxide, glass and other metal oxides, metal nitrides, metal carbonates, barium sulfate and other metal sulfates Etc. can be used alone or in admixture of two or more.
- silica and alumina can be preferably used in terms of low thermal expansion, heat dissipation, low moisture absorption, and dispersion stability in the adhesive.
- the content of the inorganic particles (d) in the adhesive is preferably 30 to 80% by mass and more preferably 50 to 70% by mass with respect to the total amount of the components (a) to (d) described above. .
- (D) When the content of the inorganic particles is 30 to 80% by mass, unevenness in thickness due to flow deformation is less likely to occur when the adhesive is heated and dried, and this is accompanied by production using this adhesive.
- the connection reliability of the semiconductor device thus improved is further improved. In particular, the connection reliability can be further maintained in the case where a process requiring stronger durability such as a moisture absorption reflow process and a thermal cycle process is performed.
- the dispersibility of the inorganic particles in the adhesive becomes more sufficient, and the aggregation of the inorganic particles is reduced.
- problems such as cracking of the adhesive sheet and falling off from the releasable plastic film are less likely to occur.
- the shape of the inorganic particles may be spherical, crushed, non-spherical, such as flaky, but can be preferably used because the spherical inorganic particles are easily dispersed uniformly in the adhesive.
- the average particle diameter of the spherical inorganic particles is preferably 3 ⁇ m or less. More preferably, the average particle size is 10 nm or more and 1 ⁇ m or less. When the average particle diameter is 10 nm or more, dispersibility is further improved, and the adhesive can be filled at a higher concentration.
- the surface area of the inorganic particles becomes sufficiently large, so that the interaction between (d) the inorganic particles, the above components (a) to (c), and the components mixed as necessary The force becomes sufficiently large and is less likely to flow and deform when heated and dried.
- the particle size of the inorganic particles is preferably 100 nm or less, and more preferably 60 nm or less.
- the particle size of the inorganic particles is preferably 100 nm or less, and more preferably 60 nm or less.
- the average particle size of the inorganic particles indicates the particle size when the inorganic particles are present alone, and indicates the most frequent particle size.
- the particle diameter of an inorganic particle represents the diameter when the shape of the inorganic particle is spherical, and represents the maximum length of the shape when the shape is elliptical or flat. Furthermore, in the case of rod shape or fiber shape, it represents the maximum length in the longitudinal direction.
- SEM scanning electron microscope
- the adhesive of the present invention may further contain a thermoplastic resin for the purpose of reducing the stress of the cured film.
- thermoplastic resin include phenoxy resin, polyester, polyurethane, polyamide, polypropylene, acrylonitrile-butadiene copolymer (NBR), styrene-butadiene copolymer, (SBR), acrylonitrile-butadiene-methacrylic acid copolymer, Examples include, but are not limited to, acrylonitrile-butadiene-acrylic acid copolymers.
- an ion scavenger, a surfactant, a silane coupling agent, an organic dye, an inorganic pigment and the like may be contained.
- the adhesive of the present invention may be used as a varnish by mixing each constituent material in a solvent.
- the adhesive may be formed into a sheet and used as an adhesive film. Examples of the method of forming the adhesive into a sheet include a method of removing the solvent after applying the adhesive varnish on the peelable substrate.
- Solvents include ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone; ether solvents 1,4-dioxane, tetrahydrofuran, diglyme; glycol ether solvents methyl cellosolve, ethyl cellosolve, propylene glycol monomethyl Ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, diethylene glycol methyl ethyl ether; other benzyl alcohol, N-methylpyrrolidone, ⁇ -butyrolactone, ethyl acetate, N, N-dimethylformamide, etc. It can be used, but is not limited to these.
- the peelable substrate polypropylene film, polyethylene terephthalate film, polyethylene naphthalate film, polyester film, polyvinyl chloride film, polycarbonate film, polyimide film, polytetrafluoroethylene film and other fluororesin films, polyphenylene sulfide film, polypropylene film , Polyethylene film and the like, but are not limited thereto.
- the release substrate may be subjected to a release treatment with a silicone release agent, a long-chain alkyl release agent, a fluorine release agent, an aliphatic amide release agent, or the like.
- the thickness of the peelable substrate is not particularly limited, but usually 5 to 75 ⁇ m is preferable.
- the thickness of the peelable substrate is preferably equal to or greater than the thickness of the adhesive.
- another peelable substrate may be laminated on the surface opposite to the surface having the releasable substrate of the adhesive film to form an adhesive film sandwiched between the peelable substrates.
- the material and thickness of another peelable substrate the same materials as described above can be used. Both peelable substrates may be the same.
- the difference in adhesive strength is preferably 5 N / m or more, and more preferably 47 N / m or less.
- the adhesive in which each constituent material is mixed in a solvent to form a varnish can be applied to a semiconductor wafer, a circuit board or the like and removed from the solvent.
- the minimum melt viscosity of the adhesive of the present invention is preferably in the range of 100 Pa ⁇ s to 10000 Pa ⁇ s.
- a more preferable range of the minimum melt viscosity is 600 Pa ⁇ s or more and 5000 Pa ⁇ s or less.
- the minimum melt viscosity of the adhesive is measured using a dynamic viscoelasticity measuring device, for example, for a sample having a diameter of 15 mm and a thickness of 0.8 mm, a heating rate of 2 ° C./min, a measurement frequency of 1 Hz, and a measurement. It can be measured at a strain of 9% and a measurement temperature range of 0 ° C to 150 ° C. As the measurement temperature increases from 0 ° C., the viscosity of the adhesive decreases. However, when the temperature exceeds a certain value, the viscosity of the adhesive starts to increase due to the curing reaction. The minimum value of the viscosity at this time is defined as the minimum melt viscosity.
- the adhesive of the present invention preferably has a minimum melt viscosity of 100 to 10,000 Pa ⁇ s after storage for 1 month in an environment of 23 ° C. and 55% RH.
- a minimum melt viscosity 100 to 10,000 Pa ⁇ s after storage for 1 month in an environment of 23 ° C. and 55% RH.
- acid-modified rosin is used as a curing agent for the adhesive.
- This acid-modified rosin has a bulky cyclohexane ring generated by acid modification in addition to having a bulky structure, which sterically hinders the reaction of the epoxy group to the carboxyl group. Therefore, the minimum melt viscosity after storage under the above conditions can be controlled within the range of 100 to 10,000 Pa ⁇ s.
- the adhesive of the present invention can be suitably used as an adhesive for semiconductors for bonding or fixing circuit members such as semiconductor elements, circuit boards and metal wiring materials used in semiconductor devices, and sealing semiconductor elements. it can.
- the semiconductor device of the present invention includes a cured product of the adhesive or a cured product of the adhesive film.
- the semiconductor device in the present invention refers to all devices that can function by utilizing the characteristics of semiconductor elements.
- a semiconductor device includes a semiconductor element connected to a substrate, a semiconductor element or substrates connected to each other, an electro-optical device, a semiconductor circuit substrate, and an electronic device.
- the adhesive or the adhesive film is interposed between the first circuit member and the second circuit member, and the first circuit member and the second circuit are heated and pressed. These circuit members are electrically connected.
- a first circuit member having a first connection terminal and a second circuit member having a second connection terminal are prepared.
- a circuit member a chip component such as a semiconductor chip, a resistor chip, a capacitor chip, a semiconductor chip or silicon interposer having a TSV (through silicon via) electrode, a glass epoxy circuit board, a film circuit board, a glass board, Examples thereof include a substrate such as a glass interposer with a through electrode.
- connection terminals include plating bumps made of gold, copper, etc., copper pillar bumps with solder caps in which solder is formed in a hemispherical shape at the tip of the copper pillar, bump electrodes such as stud bumps, solder balls, pad electrodes, etc. It is done. Further, the through electrode may be formed on the first circuit member and / or the second circuit member, and the connection terminal may be formed on one side and / or both sides of the member.
- the first circuit member and the second circuit member are arranged so that the first connection terminal and the second connection terminal face each other.
- the adhesive of the present invention is interposed between the first connection terminal and the second connection terminal that are arranged to face each other. And a 1st circuit member and a 2nd circuit member are heat-pressed, and the 1st connection terminal and 2nd connection terminal which were arrange
- the first circuit member and the second circuit member are firmly electrically connected, and the adhesive is cured, so that the first circuit member and the second circuit member are physically connected. Fixed to.
- the adhesive may be previously applied only to the surface on the connection terminal side of one of the circuit members, or may be applied to both surfaces on the connection terminal side of the first and second circuit members. Good.
- a semiconductor chip having a first circuit member and a bump is used, and a circuit board or a semiconductor chip having a wiring pattern is used as the second circuit member, both of which are interposed via the adhesive film of the present invention.
- a method for manufacturing a semiconductor device by connecting the first and second circuit members with an adhesive will be described.
- the adhesive film is attached to a circuit board or semiconductor chip on which a wiring pattern is formed, which is a second circuit member.
- the adhesive film may be attached to the wiring pattern surface of the circuit board on which the wiring pattern is formed or the bump forming surface of the semiconductor chip after cutting out to a predetermined size.
- the semiconductor wafer may be diced into individual pieces, thereby producing a semiconductor chip to which the adhesive film is attached.
- the semiconductor chip as the first circuit member is arranged so that the bump of the first circuit member and the wiring pattern of the second circuit member face each other, and both are heated and pressed using a bonding apparatus.
- the heating and pressing conditions are not particularly limited as long as electrical connection can be obtained satisfactorily.
- the temperature is 100 ° C. or more
- the pressure is 1 mN / bump or more
- the time is 0. • Heating and pressing for 1 second or more is necessary.
- the temperature is 120 ° C. to 300 ° C., more preferably 150 ° C.
- the bonding conditions are set to 60 seconds or shorter, more preferably 2 seconds to 30 seconds.
- the bump on the semiconductor chip and the wiring pattern on the circuit board are brought into contact with each other by heating and pressing at a temperature of 50 ° C. or more, a pressure of 1 mN / bump or more, and a time of 0.1 second or more. Bonding may be performed under the above conditions. If necessary, the circuit board with a semiconductor chip may be heated at a temperature of 50 ° C. or higher and 200 ° C. or lower for 10 seconds to 24 hours after bonding.
- the adhesive of the present invention includes a die attach film, a dicing die attach film, a lead frame fixing tape, a heat sink, a reinforcing plate, an adhesive for a shielding material, an adhesive resin material for producing a solder resist, etc. Can be used as
- circuit boards or semiconductor chips to which semiconductor adhesives and semiconductor adhesives are attached are preferably stored at room temperature of 30 days or more as a storage period until curing. It is required to be allowed to stand, and more preferably to be allowed to stand at room temperature for 60 days or longer.
- the adhesive of the present invention it can be stored for 60 days or more even at room temperature, there is no foaming at the time of bonding, initial conduction can be obtained by short-time heating and pressurization, and -40 ° C to 125 ° C after moisture absorption reflow.
- it is possible to obtain a semiconductor device excellent in connection reliability that can be conducted even in the thermal shock test.
- Synthesis Example 1 Synthesis of Polyimide A Under a dry nitrogen stream, 4.82 g (0.0165 mol) of 1,3-bis (3-aminophenoxy) benzene (hereinafter referred to as APB-N), 3,3′-diamino- 4,8'-dihydroxydiphenylsulfone (hereinafter referred to as ABPS) 3.08 g (0.011 mol), 1,3-bis (3-aminopropyl) tetramethyldisiloxane (hereinafter referred to as SiDA) 4.97 g (0.02 mol) and 0.55 g (0.005 mol) of 3-aminophenol as an end-capping agent were dissolved in 130 g of N-methylpyrrolidone (hereinafter referred to as NMP).
- NMP N-methylpyrrolidone
- BSAA 2,2-bis ⁇ 4- (3,4-dicarboxyphenoxy) phenyl ⁇ propane dianhydride
- Synthesis Example 2 Synthesis of Polyimide B APB-N 4.82 g (0.0165 mol), ABPS 3.08 g (0.011 mol), SiDA 4.97 g (0.02 mol), and terminal under a dry nitrogen stream
- 0.47 g (0.005 mol) of aniline was dissolved in 130 g of NMP.
- 26.02 g (0.05 mol) of BSAA was added together with 20 g of NMP, reacted at 25 ° C. for 1 hour, and then stirred at 50 ° C. for 4 hours. Then, it stirred at 180 degreeC for 5 hours.
- Synthesis Example 3 Synthesis of Polyimide C 24.54 g (0.067 mol) of 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (hereinafter referred to as BAHF) and 4.97 g of SiDA under a dry nitrogen stream (0.02 mol) and 1.86 g (0.02 mol) of aniline as an end-capping agent were dissolved in 80 g of NMP.
- BAHF 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane
- ODPA bis (3,4-dicarboxyphenyl) ether dianhydride
- polyimide C having a phenolic hydroxyl group in the side chain and containing 7.5% by mass of the structure represented by the general formula (1) was obtained. 6 g of tetrahydrofuran was added to 4 g of polyimide C, and the mixture was stirred at 23 ° C. and dissolved.
- Synthesis Example 4 Synthesis of Polyimide D Under a dry nitrogen stream, APB-N 8.03 g (0.0275 mol), SiDA 4.97 g (0.02 mol), and 0.47 g (0.0. 005 mol) was dissolved in 130 g of NMP. To this, 26.02 g (0.05 mol) of BSAA was added together with 20 g of NMP, reacted at 25 ° C. for 1 hour, and then stirred at 50 ° C. for 4 hours. Then, it stirred at 180 degreeC for 5 hours. After completion of the stirring, the solution was poured into 3 L of water, filtered to collect a precipitate, washed with water three times, and then dried at 80 ° C. for 20 hours using a vacuum dryer.
- Acid-modified rosin KE-604 (trade name, acid value 240 (KOH mg / g), softening point 130 ° C., color tone 150 hazen, acrylic-modified rosin, manufactured by Arakawa Chemical Industries, Ltd.).
- KR-120 (trade name, acid value 320 (KOHmg / g), softening point 120 ° C., color tone 150 Hazen, manufactured by Arakawa Chemical Industries, Ltd.).
- C ′ Other latent curing agent Liquid epoxy compound contained in Novacure (registered trademark) HXA-3941HP (trade name, manufactured by Asahi Kasei E-Materials Co., Ltd.).
- the amount described in parentheses indicates the mass part as a microcapsule.
- D Inorganic particles SO-E2 (trade name, manufactured by Admatechs Co., Ltd., spherical silica particles, average particle size 0.5 ⁇ m)
- F Solvent: methyl isobutyl ketone (hereinafter referred to as MIBK)
- G Rosin KR-85 (trade name, acid value 175 (KOHmg / g), softening point 85 ° C., color tone 60 Hazen, manufactured by Arakawa Chemical Industries).
- Examples 1 to 30 and Comparative Examples 1 to 8 (1) Method for Producing Adhesive Film Components (a) to (f) shown in Tables 1 to 4 were mixed in the composition ratios shown in the table to produce an adhesive varnish. Using a slit die coater (coating machine), the prepared adhesive varnish is a surface treated surface of a 50 ⁇ m thick polyester terephthalate film (trade name, Therapy (registered trademark) HP2 (U)) that is a peelable substrate. And dried at 80 ° C. for 10 minutes.
- a ⁇ m thick polyester terephthalate film trade name, Therapy (registered trademark) HP2 (U)
- the sheet material is slit to a width of 7.5 mm using a film slitter and wound on a reel having an outer diameter of 5.0 cm so that the peelable substrate HP2 (U) is on the outside,
- the wound body of the adhesive film which has a peelable base material was obtained.
- the obtained wound body was immediately subjected to the steps after (2), and after being stored for 1 month and 3 months in an environment of 23 ° C. and 55% RH, the steps after (2) were performed. In terms of things, the rolls with different storage conditions were evaluated.
- a semiconductor chip (with bump electrodes consisting of copper 30 ⁇ m + lead-free solder 15 ⁇ m, 448 bumps / chip, pitch 60 ⁇ m, peripheral arrangement, 7.5 mm square chip) is fixed to a bonding stage heated to 80 ° C., temperature 80 ° C., pressure After temporary pressure bonding to the circuit board with adhesive under the conditions of 15 N / chip and time of 5 seconds, the main pressure bonding was performed at a temperature of 250 ° C. and a pressure of 200 N / chip for 10 seconds. When bonding at one location was completed, the semiconductor chip was bonded to all 300 locations by repeatedly performing the next bonding. The time taken from the start to the end of bonding was 60 minutes.
- circuit boards with semiconductors were produced by dividing the circuit board after bonding with a board cutting device.
- the obtained circuit board with a semiconductor constitutes a daisy chain by connecting the semiconductor chip and the circuit board.
- a liquid crystal panel semiconductor device
- a display test was performed on 300 liquid crystal panels, and 99.5% or more of the liquid crystal panels that passed the test was A, 95.0% to less than 99.5% was B, and less than 95.0% was C. The results are shown in Tables 1 to 4 (before reliability test).
- step (1) Measurement of adhesive melt viscosity after standing at 23 ° C., 55% RH, 1 month and 3 months
- each was stored for 1 month and 3 months in an environment of 23 ° C. and 55% RH.
- the melt viscosity was measured under the following conditions. When the minimum melt viscosity was 100 Pa ⁇ s or more and 10,000 Pa ⁇ s or less, it was evaluated as A, and the others were evaluated as C.
- Dynamic viscoelasticity measuring device MCR-302 (manufactured by Anton Paar Japan Co., Ltd.), Sample dimensions: 15mm diameter, 0.8mm thickness Temperature increase rate: 2 ° C / min, Measurement frequency: 1Hz, Measurement strain: 9% Measurement temperature range 0 ° C to 150 ° C.
- Examples 31 to 46 and Comparative Examples 9 to 12 An adhesive was prepared and evaluated in the same manner as in Examples 8 to 14, 22 to 30 and Comparative Examples 3, 4, 7, and 8 except that the organic solvent soluble polyimide B was changed to the organic solvent soluble polyimide C. Results similar to the evaluation results of the liquid crystal display tests of Examples 8 to 14, 22 to 30 and Comparative Examples 3, 4, 7, and 8 were obtained.
- Examples 47-76 A semiconductor adhesive was prepared and evaluated in the same manner as in Examples 1 to 30 except that the acid-modified rosin KE-604 as the latent curing agent was changed to the acid-modified rosin KR-120. The same result as the evaluation result of the liquid crystal display test was obtained.
- Examples 77 to 83 and Comparative Examples 13 and 14 The components (a) to (f) shown in Table 5 were prepared so as to have the mixing ratio shown in Table 5, and an adhesive was prepared and evaluated in the same manner as in Example 1. Evaluation results were obtained.
- the adhesive of the present invention can be used as an adhesive used for bonding an electronic component or a heat sink used for a personal computer or a portable terminal and a printed board or a flexible board, and bonding between boards. Furthermore, it can be suitably used as an adhesive for semiconductors used when a semiconductor chip such as an LSI, LED, or laser diode is bonded or directly electrically bonded to a circuit board such as a flexible board, a glass epoxy board, a glass board, or a ceramic board. is there.
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Abstract
Description
検出器:Waters996
システムコントローラー:Waters2690
カラムオーブン:Waters HTR-B
サーモコントローラー:Waters TCM
カラム:TOSOH guard column
カラム:TOSOH TSK-GEL α-4000
カラム:TOSOH TSK-GEL α-2500などが挙げられる。
乾燥窒素気流下、1,3-ビス(3-アミノフェノキシ)ベンゼン(以下、APB-Nとする)4.82g(0.0165モル)、3,3’-ジアミノ-4,4’-ジヒドロキシジフェニルスルホン(以下、ABPSとする)3.08g(0.011モル)、1,3-ビス(3-アミノプロピル)テトラメチルジシロキサン(以下、SiDAとする)4.97g(0.02モル)、および、末端封止剤として3-アミノフェノール0.55g(0.005モル)をN-メチルピロリドン(以下、NMPとする)130gに溶解した。ここに2,2-ビス{4-(3,4-ジカルボキシフェノキシ)フェニル}プロパン二無水物(以下、BSAAとする)26.02g(0.05モル)をNMP20gとともに加えて、25℃で1時間反応させ、次いで50℃で4時間撹拌した。その後、180℃で5時間撹拌した。撹拌終了後、溶液を水3Lに投入し、ろ過して沈殿を回収し、水で3回洗浄した後、真空乾燥機を用いて80℃20時間乾燥した。得られたポリマー固体の赤外吸収スペクトルを測定したところ、1780cm-1付近、1377cm-1付近にポリイミドに起因するイミド構造の吸収ピークが検出された。このようにして末端および側鎖にフェノール性水酸基を有し、一般式(1)で表される構造が11.5質量%含まれるポリイミドAを得た。4gのポリイミドAにテトラヒドロフラン6gを加え、23℃で撹拌したところ溶解した。
乾燥窒素気流下、APB-N 4.82g(0.0165モル)、ABPS 3.08g(0.011モル)、SiDA 4.97g(0.02モル)、および、末端封止剤としてアニリン0.47g(0.005モル)をNMP130gに溶解した。ここにBSAA 26.02g(0.05モル)をNMP20gとともに加えて、25℃で1時間反応させ、次いで50℃で4時間撹拌した。その後、180℃で5時間撹拌した。撹拌終了後、溶液を水3Lに投入し、ろ過して沈殿を回収し、水で3回洗浄した後、真空乾燥機を用いて80℃20時間乾燥した。得られたポリマー固体の赤外吸収スペクトルを測定したところ、1780cm-1付近、1377cm-1付近にポリイミドに起因するイミド構造の吸収ピークが検出された。このようにして側鎖にフェノール性水酸基を有し、一般式(1)で表される構造が11.6質量%含まれるポリイミドBを得た。4gのポリイミドBにテトラヒドロフラン6gを加え、23℃で撹拌したところ溶解した。
乾燥窒素気流下、2,2-ビス(3-アミノ-4-ヒドロキシフェニル)ヘキサフルオロプロパン(以下、BAHFとする)24.54g(0.067モル)、SiDA4.97g(0.02モル)、および、末端封止剤として、アニリン1.86g(0.02モル)をNMP80gに溶解させた。ここにビス(3,4-ジカルボキシフェニル)エーテル二無水物(以下、ODPAとする)31.02g(0.1モル)をNMP20gとともに加えて、20℃で1時間反応させ、次いで50℃で4時間撹拌した。その後、キシレンを15g添加し、水をキシレンとともに共沸させながら、180℃で5時間攪拌した。攪拌終了後、溶液を水3Lに投入して白色沈殿したポリマーを得た。この沈殿をろ過して回収し、水で3回洗浄した後、真空乾燥機を用いて80℃、20時間乾燥した。得られたポリマー固体の赤外吸収スペクトルを測定したところ、1780cm-1付近、1377cm-1付近にポリイミドに起因するイミド構造の吸収ピークが検出された。このようにして側鎖にフェノール性の水酸基を有し、一般式(1)で表される構造が7.5質量%含まれるポリイミドCを得た。4gのポリイミドCにテトラヒドロフラン6gを加え、23℃で撹拌したところ溶解した。
乾燥窒素気流下、APB-N 8.03g(0.0275モル)、SiDA 4.97g(0.02モル)、および、末端封止剤としてアニリン0.47g(0.005モル)をNMP130gに溶解した。ここにBSAA 26.02g(0.05モル)をNMP20gとともに加えて、25℃で1時間反応させ、次いで50℃で4時間撹拌した。その後、180℃で5時間撹拌した。撹拌終了後、溶液を水3Lに投入し、ろ過して沈殿を回収し、水で3回洗浄した後、真空乾燥機を用いて80℃20時間乾燥した。得られたポリマー固体の赤外吸収スペクトルを測定したところ、1780cm-1付近、1377cm-1付近にポリイミドに起因するイミド構造の吸収ピークが検出された。このようにして一般式(1)で表される構造が11.6質量%含まれるポリイミドDを得た。4gのポリイミドDにテトラヒドロフラン6gを加え、23℃で撹拌したところ溶解した。
固形エポキシ化合物
N865(商品名、エポキシ当量:200g/eq、大日本インキ化学工業(株)製)
液状エポキシ化合物
YL980(商品名、185g/eq、三菱化学(株)製)。
KE-604(商品名、酸価240(KOHmg/g)、軟化点130℃、色調150ハーゼン、アクリル変性ロジン、荒川化学工業(株)製)。
KR-120(商品名、酸価320(KOHmg/g)、軟化点120℃、色調150ハーゼン、荒川化学工業(株)製)。
ノバキュア(登録商標)HXA-3941HP(商品名、旭化成イーマテリアルズ(株)製)中に含まれる液状エポキシ化合物。ノバキュア(登録商標)HXA-3941HPは、マイクロカプセル型硬化剤/液状エポキシ化合物が1/2であり、含まれる液状エポキシ化合物は、ビスフェノールA型エポキシ化合物/ビスフェノールF型エポキシ化合物=1/4である。表中のノバキュア(登録商標)HXA-3941HP記載の質量部において、括弧内に記載した量がマイクロカプセルとしての質量部を示す。
SO-E2(商品名、アドマテックス(株)製、球形シリカ粒子、平均粒子径0.5μm)
(f)溶剤:メチルイソブチルケトン(以下、MIBKとする)
(g)ロジン
KR-85(商品名、酸価175(KOHmg/g)、軟化点85℃、色調60ハーゼン、荒川化学工業(株)製)。
(1)接着剤フィルムの作製方法
表1~4に示される(a)~(f)成分を表に記載の組成比で混合して、接着剤ワニスを作製した。作製した接着剤ワニスを、スリットダイコーター(塗工機)を用いて、剥離性基材である厚さ50μmのポリエステルテレフタレートフィルム(商品名、セラピール(登録商標)HP2(U))の表面処理面に塗布し、80℃で10分間乾燥を行った。これにより得られた乾燥後の厚みが50μmの接着剤フィルム上に別の剥離性基材として厚さ10μmのポリプロピレンフィルム(商品名、トレファン(登録商標)BO型番YK57、片面コロナ放電処理品)の未処理面をラミネートした後、外径9.6cmの紙管上に剥離性基材HP2(U)が外側になるようロール状に巻き取り、接着剤フィルムの両面に剥離性基材を有するシートの原反を得た。次に該シート原反をフィルムスリッターを用いて7.5mm幅にスリットし、外径5.0cmのリール上に剥離性基材HP2(U)が外側になるようロール状に巻き取り、両面に剥離性基材を有する接着剤フィルムの巻重体を得た。得られた巻重体は即時に(2)以降の工程を行ったものと、23℃、55%RHの環境下で1ヶ月間および3ヶ月間それぞれ保管した後に(2)以降の工程を行ったものにわけ、保存条件の異なる巻重体について評価した。
テープ貼り合わせ装置(東レエンジニアリング(株)製、DA2000)を用いて、接着剤フィルムの回路基板への貼り付けを行った。まず、(1)の工程により得られた、両面に剥離性基材を有する接着剤フィルムの巻重体から、剥離性基材YK57を除去し、接着剤フィルムを露出させた。次いで、ステージ上に固定された回路基板(無垢銅パッド電極、7.5mm角の半導体チップが300個搭載可能な回路付きのガラスエポキシ基板)に、剥離性基材YK57を剥離した後の接着剤フィルムの、接着剤フィルム面を温度80℃、1秒間の条件で貼りあわせた後、剥離性基材HP2(U)を除去した。この貼り付け工程を繰り返し行い、7.5mm角の大きさの接着剤フィルムが300カ所に貼り付けられた回路基板を得た。
(2)で作製した接着剤付き回路基板を80℃で1時間乾燥処理を行った。次いで、フリップチップボンディング装置(東レエンジニアリング(株)製、FC-2000)を用いて、接着剤付き回路基板上に半導体チップのフリップチップボンディングを行った。半導体チップ(銅30μm+鉛フリーハンダ15μmからなるバンプ電極付き、448バンプ/チップ、ピッチ60μm、ペリフェラル配置、7.5mm角チップ)を80℃に加熱されたボンディングステージに固定し、温度80℃、圧力15N/チップ、時間5秒の条件で、前記接着剤付き回路基板に仮圧着したのち、温度250℃、圧力200N/チップの条件で時間を10秒にして本圧着を行った。1カ所のボンディングが終了したら、次のボンディングへと繰り返し行うことにより、300カ所すべての場所に半導体チップのボンディングを行った。なお、ボンディング開始から終了までにかかった時間は60分であった。ボンディングを終了した回路基板を基板切断装置で分割することにより、半導体付き回路基板を300個作製した。なお、得られた半導体付き回路基板は、半導体チップと回路基板が両者の接続によりデイジーチェーンを構成するものである。作製した各半導体付き回路基板を液晶基板に組み込むことにより、液晶パネル(半導体装置)を作製し、表示テストを行った。表示されたものは合格、チップと回路基板間の接続不良の発生により表示されないものは不合格と判定した。300個の液晶パネルについて表示テストを行い、合格するものの割合が99.5%以上をA、95.0%以上~99.5%未満をB、95.0%未満をCとした。結果を表1~表4に示す(信頼性試験前)。
(3)の液晶表示テストで合格した半導体付き回路基板20個を85℃、60%RHの条件の恒温恒湿槽中に168時間放置して吸湿させた。その後、260℃、5秒のリフロー条件で半田リフローを行った(吸湿リフロー処理)。続いて半導体付き回路基板を-40℃で5分間維持後、125℃で5分間維持を1サイクルとして、この処理を10個のサンプルについては1000サイクル、残りの10個のサンプルについては2000サイクル、それぞれ繰り返した。これらの処理の後、半導体付き回路基板を液晶基板に組み込むことにより、液晶パネルを作製し、表示テストを行った。1000サイクル後、2000サイクル後の各々のサンプルについて、10個すべてについて表示されたものはA、接続不良の発生により1個でも表示されないものはCとした。結果を表1~表4に示す(信頼性試験後/1000サイクル、2000サイクル)。
(1)の工程において、23℃、55%RHの環境下で1ヶ月および3ヶ月間それぞれ保管した接着剤フィルムについて、溶融粘度を以下の条件で測定を行った。最低溶融粘度が100Pa・s以上、10000Pa・s以下の場合、Aと評価し、それ以外をCと評価した。
動的粘弾性測定装置:MCR-302(アントンパール・ジャパン(株)製)、
試料寸法:直径15mm、厚さ0.8mm
昇温速度:2℃/分、
測定周波数:1Hz、
測定ひずみ:9%、
測定温度範囲0℃から150℃。
有機溶剤可溶性ポリイミドBを有機溶剤可溶性ポリイミドCに変更した以外は実施例8~14、22~30、比較例3、4、7、8と同様に接着剤を作製し評価を行ったところ、それぞれ実施例8~14、22~30、比較例3、4、7、8の液晶表示テストの評価結果と同様の結果を得た。
潜在性硬化剤の酸変性ロジンKE-604を酸変性ロジンKR-120に変更した以外は実施例1~30と同様に半導体用接着剤を作製し評価を行ったところ、それぞれ実施例1~30の液晶表示テストの評価結果と同様の結果を得た。
表5に示される(a)~(f)成分について表5に示す配合比になるよう調合し、実施例1と同様に接着剤を作製し評価を行ったところ、表5の液晶表示テストの評価結果を得た。
Claims (8)
- (a)ポリイミド、(b)エポキシ化合物および(c)酸変性ロジンを含有する接着剤。
- (a)ポリイミドが一般式(2)または一般式(3)で表される構造を有し、かつ一般式(1)で表される構造を一般式(2)または一般式(3)中のR4として、ポリマー全量に対し5~15質量%含有するポリマーである請求項1記載の接着剤;
- (c)酸変性ロジンの含有量が(b)エポキシ化合物100質量部に対し5質量部以上、30質量部以下である請求項1または2記載の接着剤。
- さらに(d)無機粒子を含有し、(a)~(d)の全量に対し、(d)無機粒子の含有量が30~80質量%である請求項1~3のいずれか記載の接着剤。
- 請求項1~4のいずれか記載の接着剤からなる接着剤フィルム。
- 23℃、55%RHの環境下に1ヶ月保管後の最低溶融粘度が100~10000Pa・sの範囲内である請求項5記載の接着剤フィルム
- 請求項1~4のいずれか記載の接着剤の硬化物または請求項5もしくは6記載の接着剤フィルムの硬化物を含む半導体装置。
- 第一の回路部材と第二の回路部材の間に請求項1~4のいずれか記載の接着剤または請求項5もしくは6記載の接着剤フィルムを介在させ、加熱加圧により前記第一の回路部材と前記第二の回路部材を電気的に接続する半導体装置の製造方法。
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Also Published As
Publication number | Publication date |
---|---|
EP2940094A1 (en) | 2015-11-04 |
US9591768B2 (en) | 2017-03-07 |
TWI640593B (zh) | 2018-11-11 |
SG11201505053XA (en) | 2015-07-30 |
US20150315436A1 (en) | 2015-11-05 |
KR20150100727A (ko) | 2015-09-02 |
CN104870595A (zh) | 2015-08-26 |
CN104870595B (zh) | 2017-06-23 |
TW201430087A (zh) | 2014-08-01 |
JP6241415B2 (ja) | 2017-12-06 |
KR102220124B1 (ko) | 2021-02-25 |
JPWO2014103637A1 (ja) | 2017-01-12 |
EP2940094A4 (en) | 2016-08-10 |
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