WO2016031552A1 - 導電性接着剤組成物 - Google Patents
導電性接着剤組成物 Download PDFInfo
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- WO2016031552A1 WO2016031552A1 PCT/JP2015/072712 JP2015072712W WO2016031552A1 WO 2016031552 A1 WO2016031552 A1 WO 2016031552A1 JP 2015072712 W JP2015072712 W JP 2015072712W WO 2016031552 A1 WO2016031552 A1 WO 2016031552A1
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- Prior art keywords
- adhesive composition
- conductive adhesive
- filler
- conductive
- acid
- Prior art date
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- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010944 pre-mature reactiony Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- RHHHGLCTQKINES-UHFFFAOYSA-M sodium;5-amino-2-methoxy-4-sulfobenzenesulfonate Chemical compound [Na+].COC1=CC(S(O)(=O)=O)=C(N)C=C1S([O-])(=O)=O RHHHGLCTQKINES-UHFFFAOYSA-M 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004759 spandex Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 235000015096 spirit Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
- C09J179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09J179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
- C09J179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09J179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C09J179/085—Unsaturated polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/314—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive layer and/or the carrier being conductive
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2479/00—Presence of polyamine or polyimide
- C09J2479/08—Presence of polyamine or polyimide polyimide
Definitions
- the present invention relates to a conductive adhesive composition, and mainly relates to a conductive adhesive composition used for assembling electronic equipment, mounting electronic components, and the like.
- solder bonding is widely used as a means for achieving bonding between circuit wiring and individual electronic components.
- efforts to remove hazardous substances from environmental problems have become active, and there has been an active study to reduce lead contained in solder, and lead-free solder that does not contain lead is being used. .
- ACF An anisotropic Conductive Film
- conductive adhesive for example, refer to non-patent literature
- a conductive adhesive is also disclosed that melts part of the surface of the conductive particles and integrates the conductive particles when thermocompression bonding is performed (for example, see Patent Document 1).
- the ACF and the conventional conductive adhesive sometimes have insufficient adhesive strength.
- the bonding of the filler may be hindered.
- This invention is made
- the present invention includes (A) a thermosetting resin, (C) a filler containing a metal element, And (D) a conductive adhesive composition comprising at least one catalyst or curing agent, and further having a reaction initiation temperature of (A) and (D) of 180 ° C. or higher.
- the reaction start temperature may be more preferably 200 ° C. or higher.
- thermosetting with respect to the melting of the filler and the progress of bonding. If the progress of the curing of the resin is fast, the bonding of the filler may be hindered. Therefore, it is considered that the bonding of the filler becomes smooth by increasing the curing start temperature of the thermosetting resin. This is because, when the reaction start temperature is 200 ° C. or higher, the filler bonding is not hindered to a higher temperature range, and therefore, the fillers or the filler and the substrate are easily bonded.
- the present invention is particularly effective for low melting point solder.
- the (A) thermosetting resin is preferably an epoxy resin or a polyimide resin, and more preferably a bismaleimide resin.
- the addition amount of the (A) thermosetting resin is preferably 0.5 to 20.0 mass% of the total mass of the solid content of the conductive adhesive composition.
- the (B) flux preferably has an average particle size of 30 ⁇ m or less.
- the (B) flux preferably contains at least a carboxylic acid having a molecular weight of 300 or less.
- the (C) filler contains conductive particles C1 containing at least one metal element R1, and the metal element R1 includes Cu, Ag, Au, Pt, Ir, Os, Pd, Ru, Ga, In, It is preferably selected from the group consisting of Al, Re, Zn, Ni, Sn, Bi, Sb.
- the (C) filler is preferably a mixture containing conductive particles C2 further containing a metal element R2.
- the (C) filler is preferably 75% by mass or more of the total mass of the solid content of the conductive adhesive composition.
- the (C) filler is preferably a filler capable of forming a sintered body.
- the melting point of the new alloy formed by the reaction between the conductive particles C1 and the conductive particles C2 is equal to or lower than the melting point of R1.
- the blending ratio of the polymer component (E) is preferably 5 to 50% by mass of the mass of the conductive adhesive composition excluding the filler (C).
- the present invention relates to an adhesive film obtained by applying a conductive adhesive composition as described above to a substrate, and an adhesive film with a dicing tape obtained by laminating the adhesive film on a dicing tape.
- Adhesive film with dicing tape using the adhesive of the present invention Cross-sectional schematic diagram of an adhesive film with dicing tape in a different form from FIG.
- thermosetting resins of the present invention are all precursors that can be suitable for producing thermosetting plastics and / or thermosetting resins, such as natural, synthetically derived monomers, oligomers or polymers, such as (radical) polymerization. It means a modified or unmodified resin that is not fully cured and / or crosslinked, which can be further cured and / or crosslinked by reaction, polycondensation reaction and / or polyaddition reaction.
- the terms “cured” and “crosslinked” refer to a crosslinked structure or a cured structure that shows a high molecular weight as compared with a corresponding uncured resin when a thermosetting resin reacts with a catalyst or a curing agent. It is understood to mean the reaction that occurs.
- Arbitrary thermosetting resin is added as a means for improving the adhesiveness and high temperature performance of the conductive adhesive composition. Further, the flux can be inactivated.
- Thermosetting resins include, for example, epoxy resins, phenol resins, novolacs (phenol and / or cresol), polyurethane resins, polyimide resins, cyanate ester resins, polyvinyl alcohol resins, polyester resins, polyurea resins, benzoxazine resins, acrylate resins, Examples include, but are not limited to, cyanate ester resins and / or combinations thereof.
- a method of modifying the flux so as to react with a carboxylic acid or a phenol group is also known.
- a modified resin include acrylic resin, rubber (butyl group, nitrile, etc.), polyamide, polyacrylate, polyether, polysulfone, polyethylene, polypropylene, polysiloxane, polyvinyl acetate / polyvinyl ester, polyolefin, polycyanoacrylate. And polystyrene. If it can be modified to include at least one of the following functional groups, it functions as an arbitrary thermosetting resin in the composition of the present invention.
- Other functional groups known in Resins that do not have reactive sites for bonding and have poor adhesion properties, such as unmodified polypropylene, are not suitable as thermosetting resins in the present invention.
- an epoxy resin and a benzoxazine resin or a combination thereof provide good mechanical strength and / or high thermal stability.
- Epoxy resins include polyfunctional epoxy-containing compounds such as glycidyl ethers of C2-C28 diols, C1-C28 alkyl or polyphenol glycidyl ethers, pyrocatechol, resorcinol, hydroquinone, 4,4′-dihydroxydiphenylmethane (or bisphenol F, For example, RE-303-S or RE-404-S manufactured by Nippon Kayaku, 4,4'-dihydroxy-3,3'-dimethyldiphenylmethane, 4,4'-dihydroxydiphenyldimethylmethane (or bisphenol A), 4 , 4'-dihydroxydiphenylmethylmethane, 4,4'-dihydroxydiphenylcyclohexane, 4,4'-dihydroxy-3,3'-dimethyldiphenylpropane, 4,4'-dihydroxydiphenylsulfone And polyglycidyl ethers of tris (4-hydroxyphenyl) me
- Examples of commercially available epoxy resins include polyglycidyl derivatives of phenolic compounds such as EPON 825, EPON 826, EPON 828, EPON 1001, EPON 1007 and EPON 1009 (manufactured by Huntsman), Epilon EXA 83 ° C.
- EPI-REZ 3510 EPI-REZ 3515, EPI-REZ 3520, EPI-REZ 3522, EPI-REZ 3540 or EPI-REZ 3546 (made by Hexion); DER 331, DER 332, DER 383, DER 354 and DER 542 (manufactured by Dow Chemical); GY285 (manufactured by Huntsman); and BREN-S (manufactured by Nippon Kayaku).
- epoxy-containing compounds include polyepoxides prepared from polyols and the like, and polyglycidyl derivatives of phenol-formaldehyde novolac, which are DEN 431, DEN 438 and DEN 439 (Dow (Available from Chemical Co.), Epiclon N-740, Epiclon N-770, Epiclon N-775 (manufactured by DIC) and the aqueous dispersion ARALITE PZ 323 (manufactured by Huntsman).
- cresol analogs include ECN 1273, ECN 1280, ECN 1285, and ECN 1299 or Epilon N-660, Epilon N-665, Epilon N-670, Epilon N-673, Epilon N-680, and Epilon N-695 (Epiclon N-695).
- an aqueous dispersion ARARDITE ECN 1400 manufactured by Huntsman
- SU-8 and EPI-REZ 5003 are bisphenol A type epoxy novolac resins available from Hexion.
- the epoxy resin preferably has a hydrolyzable chlorine concentration of 200 ppm or less. Further, when the hydrolyzable chlorine concentration of the epoxy resin exceeds 200 ppm, the thermosetting resin may be cured before the fusion of the conductive particles occurs, and the connection characteristics may be deteriorated.
- the hydrolyzable chlorine concentration is more preferably 100 ppm or less. Moreover, it is preferable that hydrolyzable chlorine concentration is 1000 ppm or less in the whole conductive adhesive composition.
- Some of the commercially available epoxy resins satisfy the requirements of hydrolyzable chlorine concentration, and examples thereof include YD-825GS and YD-825GSH (manufactured by Nippon Steel & Sumikin Chemical).
- YD-825GS and YD-825GSH manufactured by Nippon Steel & Sumikin Chemical
- a desired chlorine concentration can be obtained by performing a purification treatment such as distillation.
- a purification treatment such as distillation.
- it is practically impossible to completely remove hydrolyzable chlorine and the case where the concentration is 0 is not included.
- Suitable benzoxazine resins can include the following structures.
- X is a direct bond (when o is 2), alkyl (when o is 1), alkylene (when o is 2 to 4), carbonyl (o is 2) ), Oxygen (when o is 2), thiol (when o is 1), sulfur (when o is 2), sulfoxide (when o is 2), and sulfone (when o is 2) is selected
- R1 is hydrogen, alkyl, selected from alkylene and aryl
- R 4 is hydrogen, halogen, or is selected from alkyl and alkenyl, or R 4, is a divalent making naphthoxazines group from benzoxazine structure It is the basis of.
- R1 is hydrogen, alkyl, selected from alkylene and aryl
- benzoxazine resin can include the following structure:
- R 4 is selected from hydrogen, halogen, alkyl and alkenyl Or R 4 is a divalent group that forms a naphthoxazine group from a benzoxazine structure.
- Benzoxazine compounds are currently available from, for example, Huntsman Advanced Materials; Georgia-Pacific Resins, Inc. And commercially available from several sources, including Shikoku Kasei (Japan, Chiba Prefecture), but if necessary, instead of using commercially available ones, usually phenolic compounds
- benzoxazine may be prepared by reacting bisphenol A, bisphenol F, bisphenol S or thiodiphenol with an aldehyde and an arylamine. See generally U.S. Pat. Nos. 4,607,091, 5,021,484 and 5,200,452.
- Polybenzoxazole resin is provided in a precursor state and cyclized by heating.
- Examples of such polybenzoxazole resins include the following.
- U, V and W each represent a divalent organic group, at least one of U or V is a group including an aliphatic chain structure having 1 to 30 carbon atoms, X is a divalent organic group including an aromatic ring structure, j And k represent the mole fraction of the A structural unit and the B structural unit, and the sum of j and k is 100 mol%.
- the polyimide resin is provided in the state of a precursor and cyclized by heating, and by adding a reactive functional group to the end of the imide oligomer, the crosslinking reaction between the imide oligomer chains proceeds by heating to cure the resin.
- a thermosetting polyimide resin to be caused.
- the former include 3,4,3 ′, 4′-biphenyltetracarboxylic dianhydride-p-phenylene diamine polymer (BPDA-PPD PI).
- the thermosetting polyimide resin mainly includes PMR polyimide, acetylene-terminated polyimide, and bismaleimide.
- PMR polyimide has the highest heat resistance, and bismaleimide can be cured at a low pressure.
- bismaleimide resins include the following structures:
- Q is a substituted or unsubstituted aliphatic, aromatic, heteroaromatic, siloxane moiety, or a combination thereof, and the alicyclic hydrocarbon having 5 to 8 carbon atoms has at least four carbon atoms having 4 to 12 carbon atoms. It preferably has a structure substituted with an alkyl group.
- X 1 to X 4 are each independently H or an alkyl group having 1 to 6 carbon atoms.
- C 36 comprising a cyclohexane-based core and four long “arms” attached to the core, as shown by the following structure.
- Examples of the bismaleimide resin having such a structure include the following.
- thermosetting resin is 0.5 to 20.0% by mass, preferably 1 to 10.0% by mass, more preferably based on the total mass of the solid content of the conductive adhesive composition. 3 to 10% by mass.
- the flux serves to remove oxide films that hinder the melting and fusion of the conductive particles.
- any known compound can be used without particular limitation as long as it does not inhibit the curing reaction of the thermosetting resin.
- carboxylic acids, inorganic acids, alkanolamines, phenols, rosin, chloride compounds and salts thereof, halogenated compounds and salts thereof, and the like flux materials suitable for use in the composition of the present invention are , Alkanolamines, carboxylic acids, phenols and mixtures thereof.
- the flux may comprise a carboxylic acid and tertiary amine salt or mixture and have potential.
- the flux can be deactivated at the end of the heat treatment of the conductive adhesive composition, and typically the functional groups of the flux and the thermosetting resin are reacted and incorporated. Inactivated. However, a compound that does not start curing the thermosetting resin at 180 ° C. or lower is preferable.
- Carboxylic acids suitable for use in the present invention may be essentially monomers, oligomers or polymers.
- the carboxylic acid species used may have a plurality of functional groups to promote efficient reactivity with the overall organic matrix and in particular with the thermosetting resin. Multiple carboxylic acids are blended together to create an optimal balance of flux activity and other properties such as viscosity, miscibility, etc. associated with other system components, lubricity, reactivity with other organic components, etc. May be. Both the acid strength and weight of each carboxylic acid functional group are considered to determine the amount required for the surface area of the reactive metal R1.
- carboxylic acid examples include acrylic acid, methacrylic acid, maleic acid, fumaric acid, valeric acid, hexanoic acid, heptanoic acid, 2-ethylhexanoic acid, octanoic acid, 2-methylheptanoic acid, 4-methyloctanoic acid, Nonanoic acid, decanoic acid, neodecanoic acid, dodecanoic acid, tetradecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, lactic acid, malic acid, citric acid, benzoic acid, phthalic acid, Isophthalic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pyruvic acid, butyric acid, pivalic acid, 2,2-dimethylbutyric acid, 3,3-di
- the carboxylic acid preferably has a molecular weight of 150 to 300 in order to prevent an abnormal increase in viscosity when applying the adhesive composition and to facilitate bonding of the conductive particles.
- dicarboxylic acids are preferred. Examples of such dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, fumaric acid, maleic acid and the like.
- the tertiary amine is used in the form of a mixture or salt with the acid functional group, and forms a buffer or salt with the acidic functional group of the carboxylic acid to prevent premature reaction with other organic components.
- a tertiary amine may be a monomer, oligomer or polymer and a combination of one or more molecules.
- Triethanolamine and tertiary alkanolamines such as N, N, N include N, N, N ′, N′-tetrakis (2-hydroxyethyl) ethylenediamine, and buffer mixtures or salts with carboxylic acid functional groups Suitable for forming.
- Flux can be introduced into the conductive film adhesive composition of the present invention in a wide variety of forms.
- a state compatible with a thermosetting resin a state mixed as particles, a state coated with conductive particles, and the like can be mentioned.
- conductive particles stearic acid, oleic acid, palmitic acid and the like, which are higher fatty acids, are particularly suitable. In certain embodiments, it is preferably particulate or liquid.
- the average particle size of the particulate flux is 30 ⁇ m or less, preferably 15 ⁇ m or less.
- the average particle size is 15 ⁇ m or less, the metal is more easily melted. It is presumed that the average particle size becomes smaller, the apparent melting point of the flux is lowered and the flux is easily melted, and the oxide film can be easily removed.
- the average particle size is preferably 10 ⁇ m or less, more preferably 6 ⁇ m or less, from the viewpoint of improving the printability of the conductive adhesive composition. Is preferably 2 ⁇ m or less.
- the average particle size is preferably 0.01 ⁇ m or more.
- the thin film indicates a thickness of 20 ⁇ m or less
- the applicability is good means that when the conductive adhesive composition is applied, for example, when a line is drawn using a dispenser, the line width is It means that the surface roughness is uniform within 10% of the film thickness when formed into a film with a coater.
- printability means that when applying a conductive adhesive composition to an object, for example, when continuously printed by screen printing, the paste viscosity on the object does not increase with time and is stable.
- average particle diameter means a D50 value of a cumulative volume distribution curve in which 50% by volume of particles measured by a laser diffraction method have a diameter smaller than this value.
- the laser diffraction method is preferably performed using a Malvern Mastersizer 2000 manufactured by Malvern Instruments. In this technique, the size of particles in a suspension or emulsion is measured using laser beam diffraction, based on either Fraunhofer or Mie theory applications. In the present invention, Mie theory or modified Mie theory for non-spherical particles is used, and the average particle diameter or D50 value relates to scattering measurement at 0.02 to 135 ° with respect to the incident laser beam.
- a diameter is obtained by taking an electron micrograph using a scanning electron microscope (SEM), measuring the cross-sectional area of the particle, and setting the measured value as the area of a corresponding circle. was determined as the particle size.
- SEM scanning electron microscope
- a method of pulverizing can be mentioned.
- a method for pulverization a pulverizer can be used.
- the pulverizer include known ball mill pulverizers, jet mill pulverizers, ultrafine pulverizers, hammer type pulverizers, mortars, roller mills and the like.
- the method of adjusting an average particle diameter is not restrict
- the amount of flux added to the conductive adhesive composition of the present invention is preferably 0.1 to 10.0% by mass of the total mass of the solid content of the conductive adhesive composition. 0.1 to 2.0 mass% of any thermosetting resin is preferable.
- (C) Filler containing metal element If the filler is a filler capable of forming a sintered body, it is preferable in that a stronger connection is possible. Sintering is a phenomenon in which particles in contact are held at a temperature below the melting point, and the coalescence of the particles proceeds in a direction that reduces the surface energy of the entire particle system, thereby densifying the particle system.
- the filler contains the metal nanofiller or consists only of the metal nanofiller to promote sintering. In other words, the smaller the particle size of the filler, the greater the total surface area per unit mass and the greater the contribution of surface energy, so the thermal energy required for melting is reduced and sintering at low temperatures is possible. Because it becomes.
- a filler As such a filler, a silver filler, a copper filler, a mixture thereof, or the like can be used.
- the filler is prepared by a method described in JP-A-2005-146408 or JP-A-2012-082516. Can do.
- the conductive particles C1 containing the metal element R1 and C2 containing the metal element R2 can be subjected to transitional liquid phase sintering to form a new alloy.
- the newly formed alloy preferably has a melting point equal to or lower than the melting point of R1.
- Liquid phase sintering is a special form of sintering in which solid powder particles coexist with the liquid phase. In liquid phase sintering, the metals diffuse into each other, creating new alloys and / or intermetallic species. By forming, the mixture becomes dense and homogenization occurs.
- transitional liquid phase sintering In transitional liquid phase sintering, the time present in the liquid phase as a result of metal homogenization is very short. That is, the liquid phase has a very high solubility in the surrounding solid phase and thus diffuses rapidly into the solid and eventually solidifies. Diffusion homogenization produces the final composition without the need to heat above the equilibrium melting temperature of the mixture of metal particles.
- conductive particles used in the present specification means all particulate substances that increase the conductivity of the composition to be formed when added to the non-conductive resin component.
- the conductive particles may have various shapes such as flakes and / or dendrites.
- the conductive particles used in the present invention are not nanowires or nanotubes.
- the diffusion and reaction of the metal elements R2 and R1 eliminates the molten phase at the process temperature or cools the reaction mixture to suppress the reaction, and the reactive element is completely Continue until depleted. After cooling, the mixture does not remelt even if heated beyond its original melt viscosity, which is evidence of a typical liquid phase sintered metal mixture.
- the number and nature of the new alloy and / or metal species formed will depend on the choice of metal components, their relative proportions, particle size distribution and process temperature.
- the composition of the residual components of the original metal element R2 and their alloys depends on these factors as well.
- Metal elements R1 that can be used for transitional liquid phase sintering include Cu, Ag, Au, Pt, Ir, Os, Pd, Ru, Ga, In, Al, Re, Zn, Ni, Sn, Bi, and Sb. More preferably, it is selected from the group consisting of Cu, Ag, Au, Pt, In, Ga, and further Cu, Ag.
- the metal element R2 is selected from the group consisting of Sn, Bi, Cd, Zn, Ga, In, Te, Hg, Tl, Sb, Se, Po, and from the group consisting of Sn, Bi, Ga, In, Zn. More preferably, it is selected. Moreover, it is preferable that R1 and R2 do not contain Pb (lead).
- the conductive particles C1 may be a metal element composed of only R1 (excluding impurities) or an alloy adjusted from a plurality of metals including R1, and examples thereof include solder described in JIS Z 3282-1999. Moreover, it is preferable that R1 accounts for 50 mass% or more of C1.
- the conductive particles C2 may be a metal element composed only of R2 (excluding impurities) or an alloy adjusted from a plurality of metals including R2. Combinations and blending ratios of R1 and R2 are disclosed in various documents, and it is preferable to select an appropriate one from the phase diagram, but it is preferable to add either R1 or R2 in excess from the viewpoint of wettability. In some cases.
- combinations with excellent conductivity include copper-indium, copper-tin, silver-indium, silver-tin, gold-indium, gold-tin, and gold-lead.
- All of the systems containing In have an eutectic point near 150 ° C., which is excellent in that low-temperature sintering easily proceeds.
- the system containing Sn has a eutectic point around 200 ° C., it is preferable in terms of heat resistance reliability.
- alloys having a melting point of 200 ° C. or lower include Sn42-Bi58 solder (melting point 138 ° C.), Sn48-In52 solder (melting point 117 ° C.), Sn42-Bi57-Ag1 solder (melting point 139 ° C.), Sn90- Of these, alloys having a melting point of 180 ° C. or lower are preferable, such as Ag2-Cu0.5-Bi7.5 solder (melting point 189 ° C.), Sn89-Zn8-Bi3 solder (melting point 190 ° C.), and Sn91-Zn9 solder (melting point 197 ° C.).
- An alloy containing Sn is preferable in that the melting point is easily adjusted to 200 ° C. or less, and an alloy of Sn and Bi is more preferable.
- a filler can be introduce
- the particles can be single metal elements or alloys of two or more elements.
- the particles may be spherical, non-spherical, or dendritic, flake, plate-like, porous, etc. In order to increase the surface area, a spherical or porous shape is advantageous.
- R1 or R2 may be present so as to coat the surface of other metal element particles, or may be present as a coating on the non-metal particle core. It may also have an organic coating to retard oxidation or facilitate incorporation into the varnish. As such an organic substance, a saturated or unsaturated fatty acid can be applied.
- the organic coating on the particles is particularly preferably used for Cu and Ag particles.
- the average particle diameter of the filler is preferably half or less of the connection interval (thickness) between the adherends, and is preferably 30 ⁇ m or less from the viewpoint of facilitating thinning and weight reduction of the device. 10 ⁇ m or less is more preferable.
- the thickness is 5 ⁇ m or less, the surface area is increased, so that the particles are easily wetted with each other.
- the thickness is 1 ⁇ m or less, the total surface area per unit mass rapidly increases and the contribution of surface energy increases, so it is necessary for melting. Excellent heat energy is reduced and sintering at low temperature becomes possible.
- the average particle size of the filler is generally 0.005 ⁇ m or more, and 0.1 ⁇ m or more is preferable in that it hardly aggregates and is excellent in dispersibility with a solvent or a resin.
- the particle size of the metal element containing a large amount of metal element in the newly formed alloy is made larger than one. be able to.
- the former is C1 and the latter is C2
- the melting of C2 can be promoted and the periphery of C1 can be easily covered, so that the sintering speed can be increased, and alloying proceeds with C1 being rich. Therefore, it may be easy to obtain the desired alloy.
- the filler is preferably 75% by mass or more, more preferably 85% by mass or more, and more preferably 90% by mass of the total mass of the solid content of the conductive adhesive composition.
- the above is more preferable.
- 99 mass% or less is preferable, and 98 mass% or less is more preferable.
- the filler may consist only of C1, but when C1 and C2 are included, the ratio of C1 and C2 in the filler takes into account the content ratio in the newly formed alloy or the reactivity. Either of them can be mixed excessively.
- Cu: Sn is 3: It can be formulated by calculating the ratio of C1 and C2 to be 1, Cu 6 In the case of Sn 5 alloy, it can mix
- the ratio of C1 and C2 can be calculated and blended so that Sn is excessive, and C1 and C2 are Cu: Sn is 3 : 1 and a Sn filler can be added separately.
- the catalyst or curing agent for the thermosetting resin includes dicyandiamide, imidazoles, acid anhydrides, carboxylic acids, amides, imides, amines, alcohols / phenols, aldehydes / ketones, nitro Curing agents including compounds, nitriles, carbamates, isocyanates, amino acids, peptides, thiols, sulfonamides, semicarbazones, oximes, hydrazones, cyanohydrins, ureas, phosphate esters / acids, thiophosphate esters / acids, phosphonate esters / Acids, phosphites, novolaks (both phenol and cresol), phosphines, phosphonamides and the like can be used as appropriate.
- a high melting point acid or base is preferable, and examples thereof include dicarboxylic acids (such as isophthalic acid) and amino acids. These high melting point acid compounds can also serve as a flux.
- dicarboxylic acids such as isophthalic acid
- amino acids such as isophthalic acid
- these high melting point acid compounds can also serve as a flux.
- polyimide resin 1,2-dimethylimidazole, 2-phenylimidazole, 2,6-lutidine, triethylamine, m-hydroxybenzoic acid, 2,4-dihydroxybenzoic acid, p-hydroxyphenylacetic acid, 4-hydroxyphenylpropioxy Examples include, but are not limited to, on acids, peroxides, 2,3-dimethyl-2,3-diphenylbutane, 3,4-dimethyl-3,4-diphenylhexane, and the like.
- reaction start temperature with any one of the thermosetting resins can be 180 ° C. or higher, it can be used as appropriate, and if the reaction start temperature is 200 ° C. or higher, the bonding of the filler to the higher temperature range is hindered. Since it is difficult, bonding between fillers or between the filler and the substrate is easy to proceed, which is more preferable in terms of improving adhesive properties and conductivity.
- the upper limit of the reaction start temperature is not particularly limited, but is preferably 350 ° C. or lower and more preferably 300 ° C. or lower in consideration of the possibility of damage to electronic components and the possibility of resin decomposition.
- the reflow temperature is more preferably not higher than the reflow temperature, and the reflow temperature is often set, for example, to 290 ° C., 280 ° C. and 265 ° C. as upper limits in eutectic solder.
- the optimum blending amount of the curing agent or catalyst varies depending on the combination of the selected thermosetting resin and the curing agent or catalyst, but in one embodiment, 1 to 25 parts by mass is included per 100 parts of the thermosetting resin. Is preferred.
- the polymer component contributes to form the conductive adhesive composition in a film form or to impart stress relaxation properties.
- the polymer component may be any one that is easy to handle and that is compatible with the thermosetting resin, in addition to constituting the conductive adhesive composition.
- suitable polymer components include phenoxy, acrylic rubber (butyl group, nitrile, etc.), polyimide, polyamide, polyacrylate, polyether, polysulfone, polyethylene, polypropylene, polysiloxane, polyvinyl acetate / polyvinyl ester, polyolefin, Examples thereof include polycyanoacrylate and polystyrene.
- the polymeric component is a phenoxy resin.
- the blending ratio of the polymer component is preferably 5 to 50% by mass of the mass excluding the filler from the solid content of the conductive adhesive composition.
- the conductive adhesive composition of the present invention comprises, for example, a plasticizer, an oil, a stabilizer, an antioxidant, a corrosion inhibitor, a chelating agent, a pigment, a dye, a polymer additive, and an antifoaming agent.
- a plasticizer for example, a plasticizer, an oil, a stabilizer, an antioxidant, a corrosion inhibitor, a chelating agent, a pigment, a dye, a polymer additive, and an antifoaming agent.
- Preservatives, thickeners, rheology modifiers, humectants, tackifiers, dispersants and water may further be included.
- examples of the additive include conductive organic compounds, such as phthalocyanine and its derivatives, anthracene, perylene and its derivatives.
- the conductivity of phthalocyanine and its derivatives can be improved by, for example, coordination with the surface of the conductive particles by the method described in Japanese Patent Application No. 2012-505509.
- the conductive adhesive composition of this embodiment can be used as a paste or film.
- a film form is preferable from the viewpoint of scooping up the adhesive composition onto the adherend during crimping connection, maintaining a tolerance, and ease of handling.
- the polymer component is preferably contained in an amount of 5 to 50% by mass with respect to the mass obtained by removing the filler from the solid content of the conductive adhesive composition.
- the filler is 85 mass of the total mass of the solid content of the conductive adhesive composition. % Or more and a thermosetting resin having a molecular weight of 2000 or more may be applied.
- the adhesive film can be produced by a usual method using the conductive adhesive composition of the present invention.
- a conductive adhesive composition solution is prepared, and the conductive adhesive composition solution is applied on the cover film to a predetermined thickness to form a coating film, and then the coating film is dried under predetermined conditions.
- an adhesive film can be manufactured. It does not specifically limit as a coating method, For example, roll coating, screen coating, gravure coating, etc. are mentioned.
- drying conditions for example, a drying temperature of 70 to 160 ° C. and a drying time of 1 to 5 minutes are performed.
- polyethylene terephthalate (PET) polyethylene
- polypropylene polypropylene
- a plastic film or paper whose surface is coated with a release agent such as a fluorine-type release agent or a long-chain alkyl acrylate release agent can be used.
- the thickness of the adhesive film is not particularly limited, but is preferably 1 to 300 ⁇ m, preferably 5 to 60 ⁇ m when the layers between adherends are bonded, and 60 to 200 ⁇ m when stress relaxation is required. preferable.
- the above adhesive film can be suitably used as an adhesive film with a dicing tape by being combined in the form of being laminated on a dicing tape.
- the dicing tape is a tape used for a process of cutting an individual circuit or package of an integrated circuit or a package mainly formed on a semiconductor wafer by cutting the wafer with a dicing saw.
- FIG. 1 and 2 are schematic cross-sectional views of an adhesive film with a dicing tape according to an embodiment of the present invention.
- FIG. 1 shows the structure of an adhesive film 10 with a dicing tape in which an adhesive film 3 is laminated on a dicing tape 11.
- the dicing tape 11 is configured by laminating the pressure-sensitive adhesive layer 2 on the base material 1, and the adhesive film 3 is provided on the pressure-sensitive adhesive layer 2.
- work affixing part may be sufficient.
- the base material 1 is a base material for the strength of the adhesive films 10 and 12 with dicing tape, and preferably has ultraviolet transparency and expands when expanded.
- polyolefins such as polyethylene, polyprolene, polybutene, polymethylpentene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester (random, alternating) Copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, polyester such as polyurethane, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyetheretherketone, polyetherimide, polyamide, wholly aromatic polyamide, Polyphenylsulfide, aramid (paper), glass, glass cloth, fluororesin, polyvinyl chloride, polyvinylidene chloride, cellulosic resin, silicone resin, cross-linked products of
- the surface of the substrate 1 is subjected to conventional surface treatments such as chromic acid treatment, ozone exposure, flame exposure, high-voltage impact exposure, ionizing radiation treatment, etc. in order to improve adhesion, retention, etc.
- a coating treatment with a primer for example, an adhesive substance described later can be performed.
- the base material 1 can be used by appropriately selecting the same type or different types, and a blend of several types can be used as necessary. In addition, a laminate of different layers can be used.
- the thickness of the substrate 1 is not particularly limited, but is generally about 50 to 200 ⁇ m.
- the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 2 is not particularly limited, and for example, a general pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a rubber-based pressure-sensitive adhesive can be used.
- a radiation curable pressure-sensitive adhesive can be used as the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 2.
- a radiation-curable pressure-sensitive adhesive can easily reduce its adhesive strength by increasing the degree of crosslinking by irradiation with radiation such as ultraviolet rays.
- the radiation curable pressure-sensitive adhesive those having a radiation curable functional group such as a carbon-carbon double bond and exhibiting adhesiveness can be used without particular limitation.
- the radiation curable pressure sensitive adhesive for example, an addition type radiation curable pressure sensitive adhesive in which a radiation curable monomer component or an oligomer component is blended with a general pressure sensitive pressure sensitive adhesive such as an acrylic pressure sensitive adhesive or a rubber pressure sensitive adhesive. An agent can be illustrated.
- Examples of the radiation curable monomer component to be blended include urethane oligomer, urethane (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, and pentaerythritol.
- Examples include stall tetra (meth) acrylate, dipentaerystol monohydroxypenta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and 1,4-butanediol di (meth) acrylate.
- the radiation curable oligomer component includes various oligomers such as urethane, polyether, polyester, polycarbonate, and polybutadiene, and those having a molecular weight in the range of about 100 to 30000 are suitable.
- the amount of the radiation curable monomer component or oligomer component can be appropriately determined according to the type of the pressure-sensitive adhesive layer. Generally, the amount is, for example, about 5 to 500 parts by mass, preferably about 40 to 150 parts by mass with respect to 100 parts by mass of the base polymer such as an acrylic polymer constituting the pressure-sensitive adhesive.
- the radiation-curable pressure-sensitive adhesive has a carbon-carbon double bond in the polymer side chain, main chain, or main chain terminal as a base polymer.
- Intrinsic radiation curable pressure sensitive adhesives using The internal radiation curable pressure-sensitive adhesive does not need to contain an oligomer component or the like that is a low-molecular component, or does not contain much, so that the oligomer component or the like moves through the pressure-sensitive adhesive over time, or the adhesive film 3 Since it does not shift to, it is preferable.
- the radiation curable pressure-sensitive adhesive examples include photopolymerizable compounds such as an addition polymerizable compound having two or more unsaturated bonds and an alkoxysilane having an epoxy group disclosed in JP-A-60-196956. And a rubber-based pressure-sensitive adhesive and an acrylic pressure-sensitive adhesive containing a photopolymerization initiator such as a carbonyl compound, an organic sulfur compound, a peroxide, an amine, and an onium salt-based compound.
- photopolymerizable compounds such as an addition polymerizable compound having two or more unsaturated bonds and an alkoxysilane having an epoxy group disclosed in JP-A-60-196956.
- a rubber-based pressure-sensitive adhesive and an acrylic pressure-sensitive adhesive containing a photopolymerization initiator such as a carbonyl compound, an organic sulfur compound, a peroxide, an amine, and an onium salt-based compound.
- the thickness of the pressure-sensitive adhesive layer 2 is not particularly limited, but is preferably about 1 to 50 ⁇ m.
- the thickness is preferably 2 to 30 ⁇ m, more preferably 5 to 25 ⁇ m.
- FIG. 1 briefly illustrates the configuration and manufacturing method of a semiconductor device using such an adhesive film with a dicing tape.
- the semiconductor wafer 4 is pressure-bonded onto the semiconductor wafer attachment portion of the adhesive film 3 in the adhesive film with dicing film 10, and this is adhered and held and fixed (attachment step).
- This step is performed while pressing with a pressing means such as a pressure roll.
- the conductive adhesive composition of the present invention can bond semiconductor chips, a semiconductor chip and a support member, and a functional member such as a support member and a heat dissipation member.
- a functional member such as a support member and a heat dissipation member.
- Such an adherend is preferably coated with a metal surface. Examples of the metal on the adherend surface include gold, silver, copper, and nickel. Further, among the above, a plurality of materials may be patterned on the substrate.
- a method for manufacturing a semiconductor device by connecting a semiconductor chip and a support member includes the following steps.
- (A) A step of applying the conductive adhesive composition to a semiconductor chip or a support member and bonding the semiconductor chip and the support member together (hereinafter referred to as “step (A)”),
- (B) A step of heating the conductive adhesive composition to join the semiconductor chip and the support member (hereinafter referred to as “step (B)”).
- the conductive adhesive composition can be prepared by mixing at least the compounds (A) to (D) in a dispersion medium. You may perform a stirring process after mixing. Further, the maximum particle size of the dispersion may be adjusted by filtration.
- the stirring treatment can be performed using a stirrer. Examples of such a stirrer include a rotation / revolution stirrer, a lycra machine, a twin-screw kneader, a triple roll, a planetary mixer, and a thin layer shear disperser. Filtration can be performed using a filtration device. Examples of the filter for filtration include a metal mesh, a metal filter, and a nylon mesh.
- a conductive adhesive layer is formed by applying the conductive adhesive composition onto a support member or a semiconductor chip.
- a paste-like conductive adhesive composition may be applied or printed, or an adhesive film of the conductive adhesive composition may be bonded.
- the conductive adhesive composition is applied to the semiconductor chip, the chip that has been divided may be used, or the chip may be formed after the conductive adhesive composition is applied in the state of the semiconductor wafer. . If the conductive adhesive composition in the form of the adhesive film with dicing tape is applied to the step of dividing the wafer into chips, the step is simple and preferable.
- the wafer After bonding the adhesive film and dicing tape to the semiconductor wafer separately, the wafer can be divided into chips, or a paste-like conductive adhesive composition is applied or printed on the semiconductor wafer, dried, and made into a B-stage. Then, a dicing tape can be attached to divide the wafer into chips.
- the dicing tape in such a case can be the same as the dicing tape used for the adhesive film with the dicing tape.
- a method for applying the paste-like conductive adhesive composition for example, dipping, spray coating, bar coating, die coating, comma coating, slit coating, and applicator can be used.
- a printing method for printing the paste-like conductive adhesive composition for example, a dispenser, stencil printing, intaglio printing, screen printing, needle dispenser, or jet dispenser method can be used.
- the adhesive layer formed by coating or printing can be appropriately dried or B-staged regardless of the presence or absence of the dicing process.
- drying method drying at room temperature, drying by heating, or drying under reduced pressure can be used.
- hot plate For heat drying or vacuum drying, hot plate, hot air dryer, hot air heating furnace, nitrogen dryer, infrared dryer, infrared heating furnace, far infrared heating furnace, microwave heating device, laser heating device, electromagnetic heating device
- a heater heating device, a steam heating furnace, a hot plate press device, or the like can be used.
- the temperature and time for drying are suitably adjusted according to the type and amount of the used dispersion medium and thermosetting resin. For example, drying at 50 to 180 ° C. for 1 to 120 minutes is preferable.
- the semiconductor chip and the support member are bonded together via the conductive adhesive composition.
- heat treatment is performed on the adhesive layer. It may be performed only by heat treatment or may be performed by heat and pressure treatment.
- heat treatment hot plate, hot air dryer, hot air heating furnace, nitrogen dryer, infrared dryer, infrared heating furnace, far infrared heating furnace, microwave heating device, laser heating device, electromagnetic heating device, heater heating An apparatus, a steam heating furnace, or the like can be used.
- a hot plate press apparatus etc. may be used for a heat pressurization process, and the above-mentioned heat processing may be performed, putting a weight and pressurizing.
- thermosetting resin By the heat treatment, melting and joining of the filler and curing of the thermosetting resin proceed in the conductive adhesive composition.
- bonding of fillers if bonding with bonding or alloying progresses not only between fillers but also between the filler and the adherend or the metal on the adherend surface, it becomes difficult to break the interface, and the line in the device This is preferable in that the effect of preventing peeling and breakage due to the difference in expansion is improved.
- Semiconductor devices can be used for power modules, transmitters, amplifiers, LED modules, battery modules, etc. composed of diodes, rectifiers, thyristors, MOS gate drivers, power switches, power MOSFETs, IGBTs, Schottky diodes, fast recovery diodes, etc. it can.
- the obtained module has high adhesion between adherends, and can also have heat conductivity, conductivity, and heat resistance.
- BA-BXZ Bisphenol A type benzoxazine, manufactured by Konishi Chemical Industries, BHPA: 2,2-bis (hydroxymethyl) furopionic acid (manufactured by Tokyo Kasei Kogyo Co., Ltd.) by jet mill pulverizer (Nisshin Engineering Co., Ltd., Karen Jet) Processed product, average particle size 10 ⁇ m
- FLUX1 Adducted compound of N, N, N ′, N′-tetrakis (2-hydroxyethyl) ethylenediamine and oleic acid
- L-threonine melting point 253 ° C.
- DSC measurement was performed using a heat flux DSC measuring instrument: DSC-60, manufactured by Shimadzu Corporation, in a sealed container and a nitrogen atmosphere at a temperature increase rate of 20 ° C./min from room temperature to 250 ° C.
- the rise temperature (DSC onset) of the curing exothermic peak was obtained from the obtained DSC char, and this was used as the reaction start temperature.
- a silver-plated silicon chip (5 mm ⁇ 5 mm) and a silver-plated substrate (adhesive surface is silver) are bonded together through conductive adhesive compositions of Examples and Comparative Examples having a thickness of 20 ⁇ m, 230 ° C., 0.5 MPa, nitrogen Heating was performed for 1.5 hours in an atmosphere, and the adhesive strength of 10 completed samples was measured.
- the adhesive strength was measured using a “Universal Bond Tester Series 4000” manufactured by Daisy under the conditions of a test temperature of 260 ° C., a test height of 10 ⁇ m, a test speed of 50 ⁇ m / s, and the failure mode was observed.
- ⁇ Adhesive was mainly destroyed in 1 to 4 pieces, and chips were mainly destroyed in all the rest.
- X The adhesive was mainly destroyed by 5 or more.
- ⁇ Volume resistivity> The conductive adhesive compositions of Examples and Comparative Examples were applied or pasted on a glass substrate and heated at 230 ° C. for 1.5 hours in a nitrogen atmosphere to produce a conductive film having a thickness of about 0.1 ⁇ m. .
- ⁇ The volume resistivity of 1.0x10- 4 ⁇ ⁇ cm less
- ⁇ a volume resistivity of 1.0x10- 4 ⁇ ⁇ cm or more
- Examples 1 to 4 contained an epoxy resin as a thermosetting resin, and the reaction initiation temperature between the epoxy resin and the curing agent was 200 ° C. or higher, so that both the adhesive properties and the conductivity were very excellent.
- Examples 6 and 7 contained a bismaleimide resin as a thermosetting resin, and the reaction initiation temperature between the bismaleimide resin and the radical initiator was 180 ° C. or higher, so that both the adhesive properties and the conductivity were very excellent. .
- Example 5 contained an epoxy resin as the thermosetting resin and the reaction initiation temperature between the epoxy resin and the curing agent was 180 ° C. or higher, both the adhesive properties and the conductivity were excellent. In the comparative example, since the reaction start temperature between the thermosetting resin and the curing agent was less than 180 ° C., the resin component hindered the bonding of the filler, resulting in poor conductivity.
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Abstract
Description
及び(D)少なくとも1つの触媒または硬化剤を含み、さらに、前記(A)と(D)との反応開始温度が180℃以上であることを特徴とする導電性接着剤組成物に関する。
また、反応開始温度は、200℃以上であればより好ましい場合がある。
当該(A)熱硬化性樹脂の添加量は、導電性接着剤組成物の固形分の総質量の0.5~20.0質量%であることが好ましい。
当該(B)フラックスは、平均粒径が30μm以下であることが好ましい。
当該(B)フラックスは、少なくとも分子量300以下のカルボン酸を含むことが好ましい。
当該(C)フィラーは、さらに金属元素R2を含む導電性粒子C2を含有する混合物であることが好ましい。
当該(C)フィラーは、導電性接着剤組成物の固形分の総質量の75質量%以上であることが好ましい。
当該(C)フィラーは、焼結体を形成可能なフィラーであることが好ましい。
当該(E)高分子成分の配合比率は、導電性接着剤組成物の固形分から前記(C)フィラーを除いた質量の5~50質量%であることが好ましい。
本願発明の熱硬化性樹脂は、熱硬化性プラスチックおよび/または熱硬化性樹脂を製造するのに適し得るすべての前駆体、例えば、天然若しくは合成由来のモノマー、オリゴマーまたはポリマー、例えば(ラジカル)重合反応、重縮合反応および/または重付加反応によりさらに硬化および/または架橋し得る、完全に硬化および/または架橋していない変性若しくは未変性樹脂を意味する。
なお、本明細書で用語「硬化」および「架橋」は、熱硬化性樹脂および、触媒または硬化剤が反応して、対応する未硬化樹脂と比較して高い分子量を示す架橋構造または硬化構造を生じる反応を意味するものと理解される。
結合のための反応性部位を有しておらず、接着特性が乏しい樹脂、例えば、無変性のポリプロピレンなどは、本発明における熱硬化性樹脂として適していない。
から選択されるか、またはR4は、ベンゾオキサジン構造からナフトオキサジン基を作る二価の基である。〕
V, Wは2価の有機基を示し、U又はVの少なくとも一方が炭素数1~30の脂肪族鎖状構造を含む基であり、Xは芳香環構造を含む2価の有機基、j及びkはA構造単位とB構造単位のモル分率を示し、j及びkの和は100モル%である。)で示される構造を有するポリベンゾオキサゾール前駆体の共重合体。
フラックスは、導電性粒子の溶融及び融合の妨げとなる酸化膜を除去するために役立つ。フラックスとしては、熱硬化性樹脂の硬化反応を阻害しない化合物であれば特に制限なく公知の化合物を使用することができる。たとえば、カルボン酸、無機酸、アルカノールアミン類、フェノール類、ロジン、塩化物化合物及びその塩、ハロゲン化化合物およびその塩などが挙げられ、本発明の組成物に使用するのに適したフラックス材料は、アルカノールアミン、カルボン酸、フェノール類およびそれらの混合物である。
使用されるカルボン酸種は、全体的な有機マトリックスと、特に熱硬化性樹脂との効率的な反応性を促進するために複数の官能基を有していてもよい。複数のカルボン酸は、他のシステムコンポーネント、潤滑性、その他の有機成分との反応性等に伴う粘度、混和性などのフラックス活性および他の特性の最適なバランスを作成するために一緒にブレンドしてもよい。各カルボン酸官能基の酸強度と重さの両方を検討して、反応性金属R1の表面積のために必要な量を決定する。
平均粒径が15μm以下であることにより金属がより溶融しやすくなる。平均粒径が小さくなることで、フラックスの見かけ融点が低下し溶融しやすくなり、酸化被膜の除去が容易となると推察している。また、導電性接着剤組成物の薄膜塗布を可能にする観点から、平均粒径は10μm以下であることが好ましく、6μm以下が更に好ましく、導電性接着剤組成物の印刷性を向上させる観点からは2μm以下であることが好ましい。また、取扱い性や薄膜塗布、印刷性の観点から、平均粒径は0.01μm以上であることが好ましい。ここで薄膜とは、20μm以下の厚さを示唆し、塗布性が良好であるとは、導電性接着剤組成物を塗布する際に、例えばディスペンサーを用いてライン描写をした場合、ライン幅が均一である、コーターでフィルム状に形成した際に表面粗さがフィルム厚の10%以内であることをいう。また、印刷性とは、対象物に導電性接着剤組成物を塗布する際に、例えばスクリーン印刷にて連続印刷した場合、対象物上のペースト粘度が経時増加せず安定であることをいう。
フィラーは焼結体を形成可能なフィラーであると、より強固な接続が可能になる点で好ましい。焼結とは、接触状態にある粒子を融点以下の温度に保持して、粒子系全体の表面エネルギーを減少する方向に粒子の合体を進行させ、粒子系を緻密化させる現象である。一実施態様において、(C)フィラーが金属ナノフィラーを含有する、または金属ナノフィラーのみから成ることで焼結が促進される。すなわち、フィラーの粒径が小さくなることで、単位質量あたりの総表面積が急激に増加して表面エネルギーの寄与が大きくなるため、融解に必要な熱エネルギーが減少し低温での焼結が可能になるからである。このようなフィラーとしては、銀フィラー、銅フィラー、またこれらの混合物などを使用することができ、例えば特開2005-146408号公報や特開2012-082516号公報に記載された方法で準備することができる。
金属元素R2としては、Sn、Bi、Cd、Zn、Ga、In、Te、Hg、Tl、Sb、Se、Poから成る群から選択され、Sn、Bi、Ga、In、Znからからなる群から選択されることがより好ましい。
また、R1、R2、ともにPb(鉛)を含まないことが好ましい。
また、酸化を遅延またはワニスへの組み込みを容易にするために、有機コーティングをされていてもよい。このような有機物としては、飽和または不飽和脂肪酸が適用できる。粒子上の有機コーティングは、特にCuやAg粒子に好ましく用いられる。
5μm以下であると、表面積が大きくなるため粒子同士がぬれやすくなる点で好ましく、1μm以下であると単位質量あたりの総表面積が急激に増加して表面エネルギーの寄与が大きくなるため、融解に必要な熱エネルギーが減少し低温での焼結が可能になる点で優れている。また、フィラーの平均粒径は、0.005μm以上のものが一般的であり、0.1μm以上であると凝集しにくく溶媒や樹脂との分散性に優れる点で、好ましい。導電性粒子C1とC2が遷移的液相焼結して新たな合金を形成する場合には、新たに形成される合金において含有量の多い金属元素を含む粒子の粒径を一方よりも大きくすることができる。たとえば前者がC1、後者がC2の場合、C2の溶融を促進しC1の周囲を容易に覆うことができるので、焼結速度を速めることができ、また、C1がリッチな状態で合金化が進むので、求める合金を得やすくできることがある。
本発明の一実施態様において、熱硬化性樹脂に対する触媒または硬化剤としては、ジシアンジアミド、イミダゾール類、酸無水物、カルボン酸、アミド、イミド、アミン、アルコール/フェノール類、アルデヒド類/ケトン類、ニトロ化合物、ニトリル、カルバメートを含む硬化剤、イソシアネート類、アミノ酸、ペプチド、チオール、スルホンアミド、セミカルバゾン、オキシム、ヒドラゾン、シアノヒドリン類、尿素類、リン酸エステル/酸、チオリン酸エステル/酸、ホスホン酸エステル/酸、亜リン酸エステル、ノボラック(フェノール及びクレゾールの両方)、ホスフィン類、ホスホンアミド等が適宜利用できる。例えばエポキシ樹脂に対しては、高融点酸or塩基が好ましく、例えばジカルボン酸(イソフタル酸など)、アミノ酸が挙げられる。これらの高融点酸化合物はフラックスを兼ねることもできる。ポリイミド樹脂の場合は、1,2-ジメチルイミダゾール、2-フェニルイミダゾール、2,6-ルチジン、トリエチルアミン、m-ヒドロキシ安息香酸、2,4-ジヒドロキシ安息香酸、p-ヒドロキシフェニル酢酸、4-ヒドロキシフェニルプロピオン酸、過酸化物、2,3-ジメチル-2,3-ジフェニルブタン、3,4-ジメチル-3,4-ジフェニルヘキサンなどが挙げられるがこれに限定されない。いずれかの熱硬化性樹脂との反応開始温度が180℃以上にできるものであれば、適宜利用でき、また、反応開始温度は、200℃以上であればより高温域までフィラーの接合が妨げられにくいため、フィラー同士やフィラーと基板の接合が進みやすく、接着特性、導電性が向上する点でより好ましい。反応開始温度の上限は特にないが、電子部品への損傷や樹脂の分解の可能性を考慮すると、350℃以下が好ましく、300℃以下がより好ましい。リフロー温度以下であると、更に好ましく、リフロー温度は例えば、共晶ハンダでは290℃、280℃、265℃を上限として行われることが多い。
高分子成分は、導電性接着剤組成物をフィルム状に形成する、または応力緩和性を付与するために寄与する。高分子成分は、取り扱いが容易であり、導電性接着剤組成物を構成するその他、特に熱硬化性樹脂との適合性有するものであればよい。好適な高分子成分の例としては、フェノキシ、アクリルゴム(ブチル基、ニトリルなど)、ポリイミド、ポリアミド、ポリアクリレート、ポリエーテル、ポリスルホン、ポリエチレン、ポリプロピレン、ポリシロキサン、ポリ酢酸ビニル/ポリビニルエステル、ポリオレフィン、ポリシアノアクリレート、ポリスチレン等が挙げられる。質量平均分子量が10,000~200,000の範囲であると、接続特性とフィルム形成の容易性の両方に優れる。特定の態様において、高分子成分は、フェノキシ樹脂である。高分子成分の配合比率は、導電性接着剤組成物の固形分からフィラーを除いた質量の5~50質量%であることが好ましい。
導電性接着剤組成物をフィルム状に形成するためには、高分子成分が、導電性接着剤組成物の固形分からフィラーを除いた質量の5~50質量%含有されることが好ましい。また、高分子成分の配合比率が導電性接着剤組成物の固形分からフィラーを除いた質量の5質量%以下の場合には、フィラーを導電性接着剤組成物の固形分の総質量の85質量%以上含有し、かつ分子量が2000以上の熱硬化性樹脂を適用するとよい場合がある。
接着フィルムは、本願発明の導電性接着剤組成物を用いて通常の方法で製造できる。例えば、導電性接着剤組成物溶液を作製し、導電性接着剤組成物溶液をカバーフィルム上に所定厚みとなる様に塗布して塗布膜を形成した後、該塗布膜を所定条件下で乾燥させることで、接着フィルムを製造できる。塗布方法としては特に限定されず、例えば、ロール塗工、スクリーン塗工、グラビア塗工等が挙げられる。また、乾燥条件としては、例えば乾燥温度70~160℃、乾燥時間1~5分間の範囲内で行われる。カバーフィルムとしては、ポリエチレンテレフタレート(PET)、ポリエチレン、ポリプロピレンや、フッ素系剥離剤、長鎖アルキルアクリレート系剥離剤等の剥離剤により表面コートされたプラスチックフィルムや紙などが使用可能である。
次に、本発明に係る導電性接着剤組成物の使用方法として、導電性接着剤組成物を用いて半導体装置を製造する方法の一例を説明する。
本発明の導電性接着剤組成物は半導体チップ同士、半導体チップと支持部材、支持部材と放熱部材のような機能部材などを接着することができる。このような被着体は表面が金属で被覆されていることが好ましい。被着体表面の金属としては、金、銀、銅、ニッケル等が挙げられる。また、上記のうち複数の材料が基材上にパターニングされていてもよい。
半導体チップと支持部材を接続して半導体装置の製造する方法は、以下の工程を有する。
(A)導電性接着剤組成物を半導体チップあるいは支持部材に付与し、半導体チップと支持部材を貼り合わせる工程(以下、「工程(A)という。」)、
(B)導電性接着剤組成物を加熱し、半導体チップと支持部材を接合する工程(以下、「工程(B)という。」)。
導電性接着剤組成物は、少なくとも前記(A)~(D)の化合物を分散媒に混合して調製できる。混合後に、撹拌処理を行ってもよい。また、ろ過により分散液の最大粒径を調整してもよい。
撹拌処理は、撹拌機を用いて行うことができる。このような撹拌機としては、例えば、自転公転型攪拌装置、ライカイ機、二軸混練機、三本ロール、プラネタリーミキサー、薄層せん断分散機が挙げられる。
ろ過にはろ過装置を用いて行うことができる。ろ過用のフィルタとしては、例えば、金属メッシュ、メタルフィルター、ナイロンメッシュが挙げられる。
また、半導体チップに導電性接着剤組成物を付与する場合は、分断が完了したチップを用いてもよいし、半導体ウェハの状態で導電性接着剤組成物を付与してからチップ化してもよい。ウェハをチップに分断する工程には前記ダイシングテープ付き接着フィルムの形態の導電性接着剤組成物を適用すると工程が簡易で好ましい。半導体ウェハに接着フィルムとダイシングテープを別々に貼り合せた後にウェハをチップに分断することもできるし、半導体ウェハにペースト状の導電性接着剤組成物を塗布又は印刷して乾燥、またBステージ化させた後にダイシングテープを貼り合せ、ウェハをチップに分断することもできる。このような場合のダイシングテープは前記ダイシングテープ付き接着フィルムに用いるダイシングテープと同様のものが適用できる。
次いで、接着剤層に対して加熱処理を行う。加熱処理のみで行ってもよいし、加熱加圧処理で行ってもよい。加熱処理には、ホットプレート、温風乾燥機、温風加熱炉、窒素乾燥機、赤外線乾燥機、赤外線加熱炉、遠赤外線加熱炉、マイクロ波加熱装置、レーザー加熱装置、電磁加熱装置、ヒーター加熱装置、蒸気加熱炉等を用いることができる。また、加熱加圧処理には、熱板プレス装置等を用いてもよいし、重りを乗せて加圧しながら前述の加熱処理を行ってもよい。
半導体装置は、ダイオード、整流器、サイリスタ、MOSゲートドライバ、パワースイッチ、パワーMOSFET、IGBT、ショットキーダイオード、ファーストリカバリダイオード等からなるパワーモジュール、発信機、増幅器、LEDモジュール、電池モジュール等に用いることができる。得られるモジュールは、被着体間に高接着性を有し、熱伝導性、導電性、耐熱性を有することもできる。
なお、使用した各成分の詳細は以下の通りである。
YL980:ビスフェノールA型エポキシ樹脂、加水分解性塩素濃度150ppm、三菱化学製
EP-4088L:DCPD型エポキシ樹脂、加水分解性塩素濃度100ppm、ADEKA製
BMI1:下記式を満たす構造
BHPA:2,2ービス(ヒドロキシメチル)フロピオン酸(東京化成工業製)のジェットミル粉砕機(日清エンジニアリング製、カレン卜ジェッ卜)による粉砕処理品、平均粒径10μm
FLUX1:N,N,N’,N’-テトラキス(2-ヒドロキシエチル)エチレンジアミンとオレイン酸のアダクト化化合物
L-threonine:融点253℃(分解)、pKa 2.63
Sn42-Bi58:球状はんだ、融点139℃、平均粒径3μm
Sn72-Bi28:球状はんだ、融点139℃、平均粒径3μm
EA0297:銀フレーク、平均粒径4μm、Metalor製
Cuフィラー:球状銅粉、平均粒径3μm、ステアリン酸表面処理
m-Phtharic acid:融点210℃(分解)、東京化成工業製
Succinic acid:融点186℃、東京化成工業製
Nofuma BC-90:2,3-ジメチル-2,3-ジフェニルブタン、10時間半減温度210℃、日本油脂製
2PHZ-PW:2-フェニル4, 5-ジヒド口キシメチルイミダゾール、四国化成製
2PZ:2-フェニルイミダゾール、四国化成製
Luperox 531M80:80% 1,1-Di-t-Amylperoxycyclohexane in Odorless Mineral Spirits、10時間半減温度93℃(ドデカン)、Arkema製
PERCUMYL D:ジクミルパーオキサイド、10時間半減温度116℃、日本油脂製
PKHA:フェノキシ樹脂、分子量25,000、Inchem製
BPAM-01:CTBN変性ポリアミド樹脂、分子量50,000、日本化薬製
TAPE1:アクリル系UVダイシングテープ、古河電気工業製
TAPE2:TAPE1に、予め放射線照射をしてワーク貼り付け部分の粘着力(対#280SUS)のみ0.5N/25mm以下に調整されたアクリル系UVダイシングテープ、古河電気工業製
実施例及び比較例の導電性接着剤組成物を示差走査熱量計(DSC)のサンプル容器に2.0mg秤量し、DSC測定により硬化発熱挙動を図示し、反応開始温度を求めた。DSC測定には島津製作所社製熱流束DSC測定器:DSC-60を用い、密閉容器、窒素雰囲気下、昇温速度20℃/minで室温から250℃まで昇温測定した。得られたDSCチャー卜から硬化発熱ピークの立ち上がり温度(DSCオンセット)を求め、これを反応開始温度とした。
20μm厚の実施例及び比較例の導電性接着剤組成物を介して、銀メッキシリコンチップ(5mm×5mm)と銀メッキ基板(接着面は銀)を貼り合せ、230℃、0.5MPa、窒素雰囲気下で1.5時間加熱し、できあがったサンプル10個の接着力を測定した。接着力は、デイジ製「万能型ボンドテスターシリーズ4000」を用いて、テスト温度260℃、テスト高さ10μm、テストスピード50μm/sの条件で測定し、また、破壊モードを観察した。
◎:10個全てで主にチップが破壊された。
○:1~4個は主に接着剤が破壊され、残りのすべては主にチップが破壊された。
×:5個以上で主に接着剤が破壊された。
実施例及び比較例の導電性接着剤組成物をガラス基板上に塗布または貼合し、窒素雰囲気下で230℃、1.5時間加熱し、膜厚が0.1μm程度の導電膜を作製した。得られた導電膜に抵抗率計ロレスタGP(三菱化学社製)直列四探針プローブを装着して室温で測定し、体積抵抗率を求めた。
○:体積抵抗率が1.0x10-4Ω・cm未満
×:体積抵抗率が1.0x10-4Ω・cm以上
実施例6および7は、熱硬化性樹脂としてビスマレイミド樹脂を含有し、ビスマレイミド樹脂とラジカル開始剤との反応開始温度が180℃以上であるため、接着特性、導電性ともに非常に優れていた。
実施例5は、熱硬化性樹脂としてエポキシ樹脂を含有し、エポキシ樹脂と硬化剤との反応開始温度が180℃以上であるため、接着特性、導電性ともに優れていた。
比較例は、熱硬化性樹脂と硬化剤との反応開始温度が180℃未満であるため、樹脂成分がフィラーの接合を妨げてしまい、導電性に劣る結果となった。
2 …… 粘着剤層
3、3’ …… 接着フィルム(熱硬化型接着フィルム)
4 …… 半導体ウェハ
10、12 …… ダイシング付き接着フィルム
11 …… ダイシングフィルム
Claims (17)
- (A)熱硬化性樹脂、
(C)金属元素を含むフィラー、及び
(D)少なくとも1つの触媒または硬化剤
を含み、
前記(A)熱硬化性樹脂と(D)少なくとも1つの触媒または硬化剤との反応開始温度が180℃以上であることを特徴とする導電性接着剤組成物。 - (A)熱硬化性樹脂、
(C)金属元素を含むフィラー、及び
(D)少なくとも1つの触媒または硬化剤
を含み、
前記(A)熱硬化性樹脂と前記(D)少なくとも1つの触媒または硬化剤との反応開始温度が200℃以上であることを特徴とする導電性接着剤組成物。 - さらに(B)フラックスを含有することを特徴とする、請求項1又は2記載の導電性接着剤組成物。
- 前記(A)熱硬化性樹脂が、エポキシ樹脂またはポリイミド樹脂であることを特徴とする、請求項1~3いずれか記載の導電性接着剤組成物。
- 前記(A)熱硬化性樹脂が、導電性接着剤組成物の固形分の総質量の0.5~20.0質量%であることを特徴とする、請求項1~4いずれか記載の導電性接着剤組成物。
- 前記(C)フィラーは、少なくとも1つの金属元素R1を含む導電性粒子C1を含有し、前記R1は、Cu、Ag、Au、Pt、Ir、Os、Pd、Ru、Ga、In、Al、Re、Zn、Ni、Sn、Bi、Sbから成る群から選択される少なくとも1つの金属元素であることを特徴とする、請求項1~5いずれか記載の導電性接着剤組成物。
- 前記(C)フィラーは、さらに金属元素R2を含む導電性粒子C2を含有する混合物であることを特徴とする、請求項6記載の導電性接着剤組成物。
- 前記(C)フィラーは、導電性接着剤組成物の固形分の総質量の75質量%以上であることを特徴とする、請求項1~7いずれか記載の導電性接着剤組成物。
- 前記(C)フィラーが焼結体を形成可能なフィラーであることを特徴とする、請求項1~8いずれか記載の導電性接着剤組成物。
- 前記導電性粒子C1と導電性粒子C2とが反応して形成される新たな合金の融点が、R1の融点以下であることを特徴とする、請求項1~9いずれか記載の導電性接着剤組成物。
- 前記(B)フラックスの平均粒径が30μm以下であることを特徴とする、請求項3~10いずれか記載の導電性接着剤組成物。
- 前記(B)フラックスが、少なくとも分子量300以下のカルボン酸を含むことを特徴とする、請求項3~10いずれか記載の導電性接着剤組成物。
- (E)高分子成分をさらに含有することを特徴とする、請求項1~12いずれか記載の導電性接着剤組成物。
- 前記(E)高分子成分の配合比率が、導電性接着剤組成物の固形分から前記(C)フィラーを除いた質量の5~50質量%であることを特徴とする、請求項1~13いずれか記載の導電性接着剤組成物。
- 前記(A)熱硬化性樹脂におけるポリイミド樹脂のうち少なくとも1つはビスマレイミド樹脂であることを特徴とする、請求項4記載の導電性接着剤組成物。
- 基材に請求項1~15いずれか記載の導電性接着剤組成物を塗布してなることを特徴とする接着フィルム。
- ダイシングテープ上に、請求項16記載の接着フィルムを積層してなることを特徴とするダイシングテープ付接着フィルム。
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CN106574164A (zh) | 2017-04-19 |
SG11201606128QA (en) | 2016-09-29 |
EP3187560A4 (en) | 2018-03-07 |
EP3187560B1 (en) | 2024-01-17 |
EP3187560A1 (en) | 2017-07-05 |
US10563096B2 (en) | 2020-02-18 |
US20170152410A1 (en) | 2017-06-01 |
PH12017500372A1 (en) | 2017-07-17 |
KR20170005431A (ko) | 2017-01-13 |
JPWO2016031552A1 (ja) | 2017-04-27 |
JP6391597B2 (ja) | 2018-09-19 |
PT3187560T (pt) | 2024-04-11 |
PH12017500372B1 (en) | 2017-07-17 |
KR101952004B1 (ko) | 2019-02-25 |
MY194517A (en) | 2022-11-30 |
CN113214757A (zh) | 2021-08-06 |
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