Classifications

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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/02—Polycondensates containing more than one epoxy group per molecule
  • C08G59/12—Polycondensates containing more than one epoxy group per molecule of polycarboxylic acids with epihalohydrins or precursors thereof
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  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
  • C08G59/22—Di-epoxy compounds
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  • 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
  • H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
  • H01L21/563—Encapsulation of active face of flip-chip device, e.g. underfilling or underencapsulation of flip-chip, encapsulation preform on chip or mounting substrate
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  • H01L23/293—Organic, e.g. plastic
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  • H01L2224/732—Location after the connecting process
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Definitions

• thermosetting resin compositions useful for mounting onto a circuit board semiconductor devices, such as chip size or chip scale packages (“CSPs”), ball grid arrays (“BGAs”), land grid arrays (“LGAs”) and the like, each of which having a semiconductor chip, such as large scale integration (“LSI”), on a carrier substrate.
• CSPs chip size or chip scale packages
• BGAs ball grid arrays
• LGAs land grid arrays
• the compositions are useful for mounting onto circuit board semiconductor chips themselves. Reaction products of the compositions of this invention are controllably reworkable when subjected to appropriate conditions .
• CSPs, BGAs and LGAs are being used to reduce the size of packages substantially to that of bare chips.
• Such CSPs, BGAs and LGAs improve the characteristics of the electronic device while retaining many of their operating features, thus serving to protect semiconductor bare chips, such as LSIs, and facilitate testing thereof.
• the CSP/BGA/LGA assembly is connected to electrical conductors on a circuit board by use of a solder connection or the like.
• a solder connection or the like.
• the reliability of the solder connection between the circuit board and the CSP/BGA/LGA often becomes suspect.
• CSP/BGA/LGA assembly is mounted on a circuit board, the space between the CSP/BGA/LGA assembly and the circuit board is often now filled with a sealing resin (commonly referred to as underfill sealing) in order to relieve stresses caused by thermal cycling, thereby improving heat shock properties and enhancing the reliability of the structure.
• a sealing resin commonly referred to as underfill sealing
• thermosetting resins that form cross linked networks when cured are typically used as the underfill sealing material, in the event of a failure after the CSP/BGA/LGA assembly is mounted on the circuit board, it is difficult to replace the CSP/BGA/LGA assembly without destroying or scrapping the CSP/BGA/LGA assembly-circuit board structure in its entirety.
• 69280/94 discloses a process where a semiconductor chip is fixed and connected to a substrate by use of a resin capable of hardening at a predetermined temperature. In the event of failure, the semiconductor chip is removed from the substrate by softening the resin at a temperature higher than the predetermined temperature. No specific resin is disclosed, and there is no discussion regarding treating the resin that remains on the substrate. Thus, the disclosed process is at best incomplete.
• U.S. Patent No. 5,423,931 it is conventional to use a solvent to remove residual resin from a circuit board.
• swelling the resin with a solvent is a time-consuming process and the corrosive organic acid ordinarily used as the solvent may reduce the reliability of the circuit board.
• the '931 patent speaks to a method for removing residual resin by irradiation with electromagnetic radiation.
• Japanese Laid-Open Patent Publication No. 251516/93 also discloses a mounting process using a bisphenol A type epoxy resin (CV5183 or CV5183S; manufactured by Matsushita
• Thermoplastic underfill resins are known for use in semiconductor chip attachment. See U.S. Patent No. 5,783,867 (Belke, Jr . ) .
• thermoplastic resins tend to leak under relatively modest temperature conditions.
• ther osetting resins cure into a matrix, which ordinarily have greater thermal stability under end use operating temperatures .
• U.S. Patent Nos. 5,512,613 (Afzali-Ardakani) , 5,560,934 (Afzali-Ardakani ) , and 5,932,682 (Buchwalter) each refer to a reworkable thermoset composition based on a diepoxide component in which the organic linking moiety connecting the two epoxy groups of the diepoxide includes an acid cleavable acyclic acetyl group.
• acid cleavable acyclic acetyl groups forming the bases of the reworkable composition, a cured thermoset need only be introduced to an acidic environment in order to achieve softening and a loss of much of its adhesiveness.
• U.S. Patent No. 5,872,158 (Kuczynski) refers to thermosetting compositions capable of curing upon exposure to actinic radiation, which are based on acetyl diacrylates, and reaction products of which are reported to be soluble in dilute acid.
• U.S. Patent No. 5,760,337 refers to thermally reworkable crosslinked resins to fill the gap created between a semiconductor device and a substrate to which it is attached. These resins are produced by reacting a dienophile (with a functionality greater than 1) with a 2.5-dialkyl substituted furan-containing polymer.
• thermosetting resin composition capable of sealing underfilling between a semiconductor device including a semiconductor chip mounted on a carrier substrate and a circuit board to which said semiconductor device is electrically connected.
• the composition includes about 100 parts by weight of an epoxy resin, about 3 to about 60 parts by weight of a curing agent, and about 1 to about 90 parts by weight of a plasticizer.
• the area around the cured thermoset is heated at a temperature of about 190 to about 260°C for a period of time ranging from about 10 seconds to about 1 minute in order to achieve softening and a loss of much of its adhesiveness.
• the present invention provides a thermosetting resin composition useful as an underfill sealant resin.
• the composition enables a semiconductor device, such as a CSP/BGA/LGA assembly which includes a semiconductor chip mounted on a carrier substrate, to be securely connected to a circuit board by short-time heat curing and with good productivity, which demonstrates excellent heat shock properties (or thermal cycle properties), and permits the CSP/BGA/LGA assembly to be easily removed from the circuit board in the event of semiconductor device or connection failure.
• a semiconductor chip may be securely connected to, and if necessary removed from, a circuit board using the inventive compositions .
• the thermosetting resin composition includes a curable resin component and a curing agent.
• the curable resin component may be chosen from those having at least two heteroatom-containing carbocyclic structures pending from a core structure, with the core structure containing at least one linkage selected from ether, thioether, carbonate and combinations thereof, which linkage is capable of being reworked under appropriate conditions so as to lose its adhesiveness.
• One such rework technique involves degrading the cured reaction product of the composition upon exposure to elevated temperature conditions and/or acidic conditions.
• the curable resin may be an epoxy resin, at least a portion of which having at least one alkylene oxide residue positioned adjacent at least one terminal epoxy group. Where the curable resin is not an epoxy resin, the inventive composition may include as a separate component an epoxy resin component .
• compositions may also include a monofunctional epoxy coreactant diluent represented by the following structure : ⁇ r " CH, Y O c -R
• the inventive compositions may also include a separate anhydride component .
• thermosetting resin composition of the present invention is curable at a relatively low temperature in a short period of time, cured reaction products thereof have excellent heat shock properties and, moreover, can be easily split by the application of force under heated conditions. That is, semiconductor devices or semiconductor chips attached to circuit boards by cured reaction products of the thermosetting resin compositions of this invention can be easily removed by heating the reaction product, allowing it to swell with a solvent, or allowing it to swell with a solvent under heated conditions .
• thermosetting resin compositions of this invention semiconductor devices, such as CSP/BGA/LGA assemblies, or semiconductor chips can be securely connected to a circuit board by short-time heat curing and with good productivity, with the resulting mounting structure demonstrating excellent heat shock properties (or thermal cycle properties) . Moreover, in the event of failure, the semiconductor device or semiconductor chip can be easily removed. This makes it possible to reuse the circuit board, thereby achieve an improvement in the yield of the production process and reducing production cost.
• FIG. 1 depicts a cross-sectional view showing an example of a semiconductor device in which the thermosetting resin composition of the present invention is used.
• FIG. 2 depicts a cross-sectional view of a semiconductor device which has been removed from the circuit board for repairing purposes.
• FIG. 3 depicts a cross-sectional view showing an example of a semiconductor flip chip assembly in which the thermosetting resin composition of the present invention is used.
• FIG. 4 depicts a flow diagram of a procedure useful to rework a cured thermosetting resin composition in accordance with the present invention, so as to remove a semiconductor device from a circuit board to which it had been attached.
• FIG. 5 depicts a temperature vs. weight loss trace of a thermal gravimetric analysis demonstrating the temperatures at which a composition in accordance with this invention ( ⁇ ) loses weight by virtue of thermal degradation contrasted to the temperatures at which a composition based on bisphenol-F-type epoxy resin (•) loses weight by virtue of thermal degradation.
• FIG. 6 depicts a temperature vs. weight loss trace of a thermal gravimetric analysis demonstrating the temperatures at which a composition in accordance with this invention (I) loses weight by virtue of thermal degradation contrasted to the temperatures at which a composition based on bisphenol-F-type epoxy resin (D) loses weight by virtue of thermal degradation.
• FIG. 7 depicts a temperature vs. weight loss trace of a thermal gravimetric analysis demonstrating the temperatures at which a composition in accordance with this invention ( ⁇ ) loses weight by virtue of thermal degradation contrasted to the temperatures at which a composition based on bisphenol-F-type epoxy resin (O) loses weight by virtue of thermal degradation.
• FIG. 8 depicts a 13 C NMR spectra of "ANCAMINE" 2337S.
• FIG. 9 depicts a FT-IR spectra of "ANCAMINE” 2337S.
• thermosetting resin composition broadly includes a curable resin component and a curing agent.
• the curable resin component may be chosen from those having at least two heteroatom-containing carbocyclic structures pending from a core structure, with the core structure containing at least one linkage selected from ether, thioether, carbonate and combinations thereof, which linkage is capable of being reworked under appropriate conditions so as to lose its adhesiveness.
• One such rework technique involves degrading the cured reaction product of the inventive composition upon exposure to elevated temperature conditions and/or acidic conditions.
• the curable resin may be an epoxy resin, at least a portion of which having at least one alkylene oxide residue positioned adjacent at least one terminal epoxy group. Where the curable resin is not itself an epoxy resin, the inventive composition may include as a separate component an epoxy resin component.
• the curable resin may be represented by the following structure:
• the box may represent one or more structural linkages including aromatic rings (s) or ring system(s), with or without interruption or substitution by one or more heteroatoms, examples of which are given below.
• X 1 , X 2 and X a and X b may be the same or different and represent the heteroatoms, oxygen and sulfur.
• the letter designations, m and m 1 represent integers within the range of 1 to 3
• n and n 1 represent integers within the range of 0 to 8
• o and o 1 represent integers within the range of 1 to 3.
• the box of the core structure of aromatic rings within the curable resin of structure I_ may be individual aromatic rings, or aromatic ring systems having multiple aromatic units joined in fused ring systems, joined in bi-aryl (such as, biphenyl) or bis-aryl (such as bisphenol A or bisphenol F, or bisphenol compounds joined by a heteroatom) systems, joined in cycloaliphatic-aromatic hybrid ring systems, or joined in oligomeric (such as, novolac-type) systems, examples of which include, among others, naphthalene, anthracene, phenanthracene and fluorene.
• the box may represent the structural linkage
• Y may or may not be present and when present is carbon, or the heteroatom, oxygen or sulfur.
• the box may represent a phenylene group. Either of these representations may bear substitution at one or more locations on the aromatic ring(s) with functional groups ordinarily present on aromatic rings (s), such as alkyl, alkenyl, halo, nitro, carboxyl, amino, hydroxyl, thio, and the like.
• curable resins within structure I include MPG, [bis [4 (2 , 3-epoxy- propylthio)phenyl]-sulfide (CAS Reg. No. 84697-35-8), available commercially from Sumitomo Seika Chemicals Co.,
• the curable resin is represented by the following structure:
• X 1 and X 2 are as above; X a and X b may be the same or different, may or may not be present, and when present represent alkyl, alkenyl, aryl and the like; and the letter designations, m and m 1 are as above.
• the heteroatom-containing carbocyclic structures pending from the core structure may be three, four or five membered rings with the heteroatom being an oxygen and/or sulfur atom. These ring structures cross-link with one another under appropriate conditions to form reaction products of the compositions of the present invention.
• the carbonate linkage is degradable upon exposure to elevated temperature conditions, with or without the presence of acid. This linkage is capable of degrading to liberate carbon dioxide gas .
• the temperature used to effect such degradation of compositions within the scope of the present invention may be as great as 50°C lower than the temperatures required to degrade ordinary epoxy-based compositions used for this purpose, such as those based on bisphenol-A-type epoxy resins or bisphenol-F-type epoxy resins, which are ordinarily in the vicinity of about 300°C or more. (See Examples section.)
• a particularly desirable curable resin within structure I_I includes CBO, carbonate bisoxetane (CAS Reg. No. 60763-95-3), available commercially from UBE Industries, Ltd., Tokyo, Japan.
• the curable resin is an epoxy resin, where at least a portion of such epoxy resin includes an epoxy resin having at least one alkylene oxide residue position adjacent at least one terminal epoxy group.
• the epoxy resin may be based on mono- or multifunctional aliphatic epoxies, epoxies with a cycloaliphatic ring structure or system, or epoxies with an aromatic ring structure or system, and combinations thereof
• the epoxy resin may include any common epoxy resin, such as a multifunctional epoxy resin.
• the multifunctional epoxy resin should be included in an amount within the range of about 15% by weight to about 75% by weight of the total of the epoxy resin component.
• the amount thereof should be in the range of from about 35% by weight to about 65% by weight, such as about 40% by weight to about 50% by weight of the total of the epoxy resin component.
• multifunctional epoxy resin examples include bisphenol-A-type epoxy resin, bisphenol-F-type epoxy resin (such as RE-404-S from Nippon Kayaku, Japan), phenol novolac- type epoxy resin, and cresol novolac-type epoxy from resin (such as "ARALDITE” ECN 1871 from Ciba Specialty Chemicals, Hawthorne, New York) .
• epoxy resins include polyepoxy compounds based on aromatic amines and epichlorohydrin, such as N, N, N ' , N ' -tetraglycidyl-4 , 4 ' -diaminodiphenyl methane; N- diglycidyl-4-aminophenyl glycidyl ether; and N,N,N',N'- tetraglycidyl-1 , 3-propylene bis-4-aminobenzoate .
• polyepoxy compounds based on aromatic amines and epichlorohydrin such as N, N, N ' , N ' -tetraglycidyl-4 , 4 ' -diaminodiphenyl methane; N- diglycidyl-4-aminophenyl glycidyl ether; and N,N,N',N'- tetraglycidyl-1 , 3-propylene bis-4-aminobenzoate
• epoxy resins suitable for use herein also include polyglycidyl derivatives of phenolic compounds, such as those available commercially under the tradename "EPON”, such as “EPON” 828, “EPON” 1001, “EPON” 1009, and “EPON” 1031 from Shell Chemical Co.; "DER” 331, “DER” 332, “DER” 334, and “DER” 542 from Dow Chemical Co.; and BREN-S from Nippon Kayaku.
• Other suitable epoxy resins include polyepoxides prepared from polyols and the like and polyglycidyl derivatives of phenol-formaldehyde novolacs, the latter of such as "DEN” 431, "DEN” 438, and "DEN” 439 from Dow Chemical.
• Cresol analogs are also available commercially under the tradename "ARALDITE”, such as “ARALDITE” ECN 1235, “ARALDITE” ECN 1273, and “ARALDITE” ECN 1299 from Ciba Specialty Chemicals Corporation.
• SU-8 is a bisphenol-A-type epoxy novolac available from Interez, Inc.
• Polyglycidyl adducts of amines, aminoalcohols and polycarboxylic acids are also useful in this invention, commercially available resins of which include GLYAMINE” 135, “GLYAMINE” 125, and “GLYAMINE” 115 from F.I.C. Corporation; "ARALDITE” MY-720, “ARALDITE” 0500, and "ARALDITE” 0510 from Ciba Specialty Chemicals and PGA-X and PGA-C from the Sherwin-Williams Co.
• epoxy resin component having at least one alkylene oxide residue positioned adjacent at least one terminal epoxy group is particularly desirable for the portion of the epoxy resin component having at least one alkylene oxide residue positioned adjacent at least one terminal epoxy group to be present in an amount of at least about 5% by weight of the total of epoxy resin component.
• aliphatic epoxies with alkylene oxide residues include, but are not limited to, mono-, di- or multifunctional epoxies containing ether linkages, such as primary, secondary and tertary alkylene diol diglycidyl ethers, and epoxies containing mono- or poly-alkylene oxide residues (such as ethylene oxide, propylene oxide, butylene oxide, pentylene oxide, and hexylene oxide residues) .
• mono-, di- or multifunctional epoxies containing ether linkages such as primary, secondary and tertary alkylene diol diglycidyl ethers
• epoxies containing mono- or poly-alkylene oxide residues such as ethylene oxide, propylene oxide, butylene oxide, pentylene oxide, and hexylene oxide residues
• n is an integer from 1 to about 18, are each appropriate, individually or in combination, for use as at least a portion of the epoxy resin component.
• Examples of cycloaliphatic epoxies with alkylene oxide residues include mono-, di- or multi functional cyclohexyl epoxies; hydrated bisphenol A-type epoxies; and hydrated bisphenol F-type epoxies, containing alkylene ether residues.
• DME-100 1, 4-cyclohexane dimethanol diglycidyl ether, available commercially from New Japan Chemical Co., Ltd.
• aromatic epoxies with alkylene oxide residues include mono-, di- or multi- functional epoxies such as bisphenol A type epoxies; bisphenol F type epoxies; phenol novolac type epoxies; and cresol novolac type epoxies, containing alkylene ether residues.
• epoxies examples include BEO-60E (ethoxylated bisphenol A di-glycidyl ether, available commercially from New Japan Chemical Co., Ltd.), and BPO-20E (propyloxylated bisphenol A di-glycidyl ether, available commercially from New Japan Chemical Co., Ltd.), which are shown below: 16
• n is an integer between and about 1 and 20, which for BPO-60E n is 1, and
• n is an integer between and about 1 and 20, which for
• the curable resin component should be present in the composition in an amount which the range of about 10% by weight to about 95% by weight, desirably about 20% by weight to about 80% by weight, such as about 60% by weight
• the epoxy resin is used in combination with a monofunctional epoxy coreactant diluent.
• Appropriate monofunctional epoxy coreactant diluents for use herein include those that have a viscosity which is lower than that of the epoxy resin component, ordinarily, less than about 250 cps .
• the monofunctional epoxy coreactant diluents should have an epoxy group with an alkyl group of about 6 to about 28 carbon atoms, examples of which include C 6 - 28 alkyl glycidyl ethers, C 6 -- 28 fatty acid glycidyl esters and C 6 -. 28 alkylphenol glycidyl ethers.
• a particularly desirable coreactant diluent is represented by:
• X represents the heteroatoms, oxygen or sulfur
• Y may or may not be present, and when present represents an alkyl (linear, branched, cyclo or bicyclo) , or alkenyl (linear, branched, cyclo or bicyclo) and the like linkage of from one to about twenty carbon atoms, linkage and an aryl (one or more aromatic ring(s) or ring system(s) ) linkage of from about six to about twenty carbon atoms.
• monofunctional epoxy coreactant diluents include those from Pacific Epoxy Polymers, Richmond, Michigan, under the trade designations PEP-6770 (glycidyl ester of neodecandoic acid) , PEP-6740 (phenyl glycidyl ether) and PEP-6741 (butyl glycidyl ether) .
• PEP-6770 glycidyl ester of neodecandoic acid
• PEP-6740 phenyl glycidyl ether
• PEP-6741 butyl glycidyl ether
• amine compounds include aliphatic polyamines, such as diethylenetriamine, triethylenetetramine and diethylaminopropylamine; aromatic polyamines, such as m- xylenediamine and diaminodiphenylamine; and alicyclic polyamines, such as isophoronediamine and menthenediamine .
• amide compounds examples include cyano- functionalized amides, such as dicyandiamide .
• imidazole compounds include imidazole, isoimidazole, and substituted imidazoles -- such as alkyl-substituted imidazoles (e.g., 2-methyl imidazole, 2- ethyl-4-methylimidazole, 2, 4-dimethylimidazole, butylimidazole, 2-heptadecenyl-4-methylimidazole, 2- methylimidazole, 2-undecenylimidazole, l-vinyl-2- methylimidazole, 2-n-heptadecylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-ethyl 4-methylimidazole, l-benzyl-2- methylimidazole, l-propyl-2-methylimidazole, l-cyanoethyl-2- methylimidazole, l-cyanoethyl-2-ethyl-4
• Examples of commercial imidazole compounds are available from Air Products, Allentown, Pennsylvania under the trade designation “CUREZOL” 1B2MZ and from Synthron, Inc., Morganton, North Carolina under the trade designation “ACTIRON” NXJ-60.
• modified amine compounds include epoxy amine additives formed by the addition of an amine compound to an epoxy compound
• modified imidazole compounds include imidazole adducts formed by the addition of an imidazole compound to an epoxy compound.
• a commercially available modified amine compound particularly useful herein is "NOVACURE” HX-3722 (an imidazole/bisphenol A epoxy adduct dispersed in bisphenol A epoxy resin, commercially available from Asahi-Ciba Ltd.), and "MY-24” (an imidazole/bisphenol A epoxy adduct, commercially available from Ajinomoto Co., Ltd.) .
• ANCAMINE 2337S is described by Air Products as a modified aliphatic amine, which is a light yellow powder in appearance with a particle size of 90% ⁇ 10 ⁇ , whose melting point is in the range of 145-172°F.
• ANCAMINE 2337S is reported to have an amine value of 260 (mg KOH/gram) , and rapid reactivity above a temperature of 158°F.
• ANCAMINE 2337S is a novolac-type resin that has been modified through reaction with aliphatic amines, such as polyamines, pyrazines, pyridines, pyroles and pyrazoles . (See FIGs . 8-9 for characterizing data.)
• the "ANCAMINE” 2337S itself is substantially insoluble at room temperature in conventional non-basic organic solvents, though was found to be soluble in pyridine.
• the curing agent should be present in an amount with the range of about 5% by weight to about 90% by weight, desirably about 20% by weight to about 60% by weight, such as about 50% by weight of the total composition.
• compositions may also include an anhydride component where the curing agent of the compositions is not based on anhydride reactivity, as well as an inorganic filler component .
• Appropriate anhydride compounds for use herein include mono- and poly-anhydrides, such as hexahydrophthalic anhydride (“HHPA”) and methyl hexahydrophthalic anhydride (“MHHPA”) (commercially available from Lindau Chemicals, Inc., Columbia, South Carolina, used individually or as a combination, which combination is available under the trade designation "LINDRIDE” 62C) and 5- (2 , 5-dioxotetrahydrol) -3- methyl-3-cyclohexene-l, 2-dicarboxylic anhydride (commercially available from ChrisKev Co., Leewood, Kansas under the trade designation B-4400) .
• MTA-15 mixture of glycol tris-anhydrotrimeritate and MHHPA, commercially available from New Japan Chemical Co., Ltd.
• the anhydride compound may be present in an amount within the range of about 5% by weight to about 90% by weight, desirably about 10% by weight to about 60% by weight, such as about 40% by weight of the total composition.
• the inorganic filler component may often include reinforcing silicas, such as fused silicas, and may be untreated or treated so as to alter the chemical nature of their surface. Virtually any reinforcing fused silica may be used.
• Particularly desirable ones have a low ion concentration and are relatively small in particle size (e.g., in the range of about 2-10 microns, such as on the order of about 2 microns) , such as the silica commercially available from Admatechs, Japan under the trade designation SO-E5.
• the inorganic filler component may be present in an amount within the range of about 5% by weight to about 95% by weight, desirably about 20% by weight to about 60% by weight, such as about 40% by weight of the total composition .
• composition may also include a flowability agent, such as a silane and/or titanate.
• a flowability agent such as a silane and/or titanate.
• silanes for use herein include octyl trimethoxy silane (commercially available from OSI Specialties Co., Danbury, Connecticut under the trade designation A-137), and methacryloxy propyl trimethoxy silane (commercially available from OSI under the trade designation A-174) .
• titanates for use herein include titanium IV tetrakis [2, 2-bis [ (2-propenyloxy) methyl] -1- butanolato-0] [bis (ditridecylphosphito-0) , dihydrogen] 2 (commercially available from Kenrich Petrochemical Inc., Bayonne, New Jersey under the trade designation KR-55) .
• the flowability agent When used, the flowability agent may be used in an amount of 0 to about 2 parts by weight, per 100 parts of the epoxy resin.
• adhesion promoters such as the silanes, glycidyl trimethoxysilane (commercially available from OSI under the trade designation A-187) or gamma-amino propyl triethoxysilane (commercially available from OSI under the trade designation A-1100), may be used.
• Cyanate esters may also be used in the inventive compositions.
• the cyanate esters useful as a component in the inventive compositions may be chosen from dicyanatobenzenes, tricyanatobenzenes, dicyanatonaphthalenes, tricyanatonaphthalenes, dicyanato-biphenyl, bis (cyanatophenyl) methanes and alkyl derivatives thereof, bis (dihalocyanatophenyl) propanes, bis (cyanatophenyl) ethers, bis (cyanatophenyl) sulfides, bis (cyanatophenyl) propanes, tris (cyanatophenyl) phosphites, tris (cyanatophenyl) phosphates, bis (halocyanatophenyl) methanes, cyanated novolac, bis [cyanatophenyl ( ethylethylidene) ] benzene, cyanated bisphenol-terminated thermoplastic
• aryl compounds having at least one cyanate ester group on each molecule may be generally represented by the formula Ar(OCN) m , where Ar is an aromatic radical and m is an integer from 2 to 5.
• the aromatic radical Ar should contain at least 6 carbon atoms, and may be derived, for example, from aromatic hydrocarbons, such as benzene, biphenyl, naphthalene, anthracene, pyrene or the like.
• the aromatic radical Ar may also be derived from a polynuclear aromatic hydrocarbon in which at least two aromatic rings are attached to each other through a bridging group.
• the aromatic radical Ar may also contain further ring-attached, non-reactive substituents .
• cyanate esters include, for instance, 1, 3-dicyanatobenzene; 1, 4-dicyanatobenzene; 1,3,5- tricyanatobenzene; 1,3-, 1,4-, 1,6-, 1,8-, 2,6- or 2,7- dicyanatonaphthalene; 1, 3, 6-tricyanatonaphthalene; 4,4'- dicyanato-biphenyl; bis (4-cyanatophenyl) methane and 3, 3', 5,5'- tetramethyl bis ( 4-cyanatophenyl) methane; 2 , 2-bis (3, 5-dichloro- 4 -cyanatophenyl) propane; 2, 2-bis (3, 5-dibromo-4- dicyanatophenyl) propane; bis (4-cyanatophenyl) ether; bis (4- cyanatophenyl) sulfide; 2, 2-bis ( 4-cyanatophenyl) propane; tris (4-cyanatophenyl) -phosphite; tri
• cyanate esters include cyanates disclosed in
• the cyanate esters When used, the cyanate esters may be used in an amount of about 1 to about 20% by weight based on the total amount of the epoxy resin component.
• compositions of the present invention may also be used in the compositions of the present invention to achieve certain desired physical properties of the composition, the cured reaction product, or both.
• a multifunctional epoxy resin reactive diluent examples of which include those from Pacific Epoxy Polymers, under the trade designations PEP-6752 (trimethylolpropane triglycidyl ether) and PEP-6760 (diglycidyl aniline) .
• thermosetting resin composition of the present invention may further contain other additives, such as defoaming agents, leveling agents, dyes and pigments.
• photopolymerization initiators may also be incorporated therein, provided that such initiators do not adversely affect the properties of the composition or reaction products formed therefrom.
• thermosetting resin composition of the present invention may be formulated as a one-part composition, in which all the ingredients are mixed together, or as a two-part composition, in which the epoxy resin and the curing agent are stored separately and mixed thereafter prior to use.
• the curing agent used in the present invention can generally be any of the curing agents that are used in one-part and two-part epoxy resin formulations, particularly those noted above .
• the thermosetting resin compositions according to the present invention are capable of penetrating into the space between the circuit board and the semiconductor device. These inventive compositions also demonstrate a reduced viscosity, at least under elevated temperature conditions, and thus are capable of penetrating into that space.
• thermosetting resin composition by selecting the types and proportions of various ingredients to reach a viscosity at 25°C of 10,000 mPa • s or less, such as 3,000 - 4,000 mPa-s, so as to improve its ability to penetrate into the space (e.g., of 50 to 500 ⁇ m) between the circuit board and the semiconductor device.
• FIG. 1 shows an example of a semiconductor device mounting structure, such as a CSP, in which the thermosetting resin composition of the present invention is used.
• the semiconductor device 4 is one formed by connecting a semiconductor chip (so-called bare chip) 2, such as LSI, to a carrier substrate 1 and sealing the space therebetween suitably with resin 3.
• This semiconductor device is mounted at a predetermined position of the circuit board 5, and electrodes 8 and 9 are electrically connected by a suitable connection means such as solder.
• the space between carrier substrate 1 and circuit board 5 is sealed with the cured product 10 of a thermosetting resin composition.
• the cured product 10 of the thermosetting resin composition need not completely fill the space between carrier substrate 1 and circuit board 5, but may fill it to such an extent as to relieve stresses caused by thermal cycling.
• Carrier substrates may be constructed from ceramic substrates made of AI2O3, SiN and mullite (Al2 ⁇ 3 ⁇ Si ⁇ 2 ) ; substrates or tapes made of heat-resistant resins such as polyimides; glass-reinforced epoxy, ABS and phenolic substrates which are also used commonly as circuit boards; and the like.
• FIG. 3 shows a flip chip assembly in which a semiconductor chip has been mounted onto a circuit board, and the underfilling sealed with a thermosetting resin composition of the present invention .
• the flip chip assembly 34 is formed by connecting a semiconductor chip (a bare chip) 32 to a circuit board 31 and sealing the space therebetween suitably with a thermosetting resin composition 33.
• This semiconductor device is mounted at a predetermined position on the circuit board 31 and electrodes 35 and 36 are electrically connected by a suitable electrical connection means 37 and 38, such as solder.
• a suitable electrical connection means 37 and 38 such as solder.
• the space between the semiconductor chip 32 and the circuit board 31 is sealed with a thermosetting resin composition 33 and then cured. The cured product of the thermosetting resin composition should completely fill that space.
• the means for electrically connecting the semiconductor chip to the carrier substrate there may be employed connection by a high- melting solder or electrically (or anisotropically) conductive adhesive, wire bonding, and the like.
• the electrodes may be formed as bumps.
• the space between the semiconductor chip and the carrier substrate may be sealed with a suitable resin.
• the semiconductor devices that can be used in the present invention include CSPs, BGAs, and LGAs.
• circuit board used in the present invention No particular limitation is placed on the type of circuit board used in the present invention, and there may be used any of various common circuit boards such as glass- reinforced epoxy, ABS and phenolic boards.
• cream solder is printed at the necessary positions of a circuit board and suitably dried to expel the solvent.
• a semiconductor device is mounted in conformity with the pattern on the circuit board.
• This circuit board is passed through a reflowing furnace to melt the solder and thereby solder the semiconductor device.
• the electrical connection between the semiconductor device and the circuit board is not limited to the use of cream solder, but may be made by use of solder balls. Alternatively, this connection may also be made through an electrically conductive adhesive or an anisotropically conductive adhesive. Moreover, cream solder or the like may be applied or formed on either the circuit board or the semiconductor device. In order to facilitate subsequent repairs, the solder, electrically or anisotropically conductive adhesive used should be chosen bearing in mind its melting point, bond strength and the like.
• the resulting structure should ordinarily be subjected to a continuity test or the like.
• the semiconductor device may be fixed thereto with a resin composition.
• a resin composition In this way, in the event of a failure, it is easier to remove the semiconductor device before fixing it with the resin composition .
• a thermosetting resin composition is applied to the periphery of the semiconductor device. When this composition is applied to the semiconductor device, it penetrates into the space between the circuit board and the carrier substrate of the semiconductor device by capillary action.
• thermosetting resin composition is cured by the application of heat.
• the thermosetting resin composition shows a significant reduction in viscosity and hence an increase in fluidity, so that it more easily penetrates into the space between the circuit board and the semiconductor device.
• the thermosetting resin composition is allowed to penetrate fully into the entire space between the circuit board and the semiconductor device.
• thermosetting resin composition applied should be suitably adjusted so as to fill the space between the circuit board and the semiconductor device almost completely.
• thermosetting resin composition When the above-described thermosetting resin composition is used, it is usually cured by heating at a temperature of about 80°C to about 150°C for a period of time of about 5 to about 60 minutes.
• the present invention can employ relatively low-temperature and short-time curing conditions and hence achieve very good productivity.
• the semiconductor device mounting structure illustrated in FIG. 1 is completed in this manner.
• thermosetting resin composition of the present invention In the mounting process using the thermosetting resin composition of the present invention, after the semiconductor device is mounted on the circuit board as described above, the resulting structure is tested with respect to characteristics of the semiconductor device, connection between the semiconductor device and the circuit board, other electrical characteristics, and the state of sealing. In the event a failure is found, repair can be made in the following manner.
• the area around the semiconductor device that has failed is heated at a temperature of about 190°C to about 260°C for a period of time ranging from about 10 seconds to about 60 seconds.
• a temperature of about 190°C to about 260°C for a period of time ranging from about 10 seconds to about 60 seconds.
• local heating is preferred.
• the semiconductor device As soon as the solder is melted and the resin is softened to cause a reduction in bond strength, the semiconductor device is pulled apart.
• a residue 12 of the cured reaction product of the thermosetting resin composition and a residue 14 of the solder are left on the circuit board 5.
• the residue of the cured product of the thermosetting resin composition can be removed, for example, by scraping it off after the residue has been softened by heating it to a predetermined temperature, allowing it to swell with solvent, or allowing it to swell with solvent while heating it to a predetermined temperature.
• the residue can be most easily removed by using both heating and solvent.
• the residue can be scraped off after it has been softened by allowing the residual resin to swell with solvent while keeping the entire circuit board at a temperature of about 100°C (usually in the range of about 80°C to about 120°C) .
• the solvent used for this purpose is one which causes cured reaction products of the thermosetting resin composition to swell, thereby reducing bond strength to such an extent that the cured material can be scraped off from the circuit board.
• Useful solvents include organic ones, for example, alkyl chlorides, such as methylene chloride; glycol ethers, such as ethyl cellulose and butyl cellulose; diesters of dibasic acids, such as diethyl succinate; and N- methylpyrrolidone . Of course, appropriate combinations may also be employed.
• the chosen solvents should cause no damage to the resist.
• Desirable solvents with this in mind include glycol ethers and N-methylpyrrolidone .
• the residue of the solder can be removed, for example, by use of a solder-absorbing braided wire.
• a new semiconductor device may be mounted again in the same manner as described previously.
• the repair of the failure site is completed.
• the semiconductor device can be reused by removing the residue 13 of the cured reaction product of the thermosetting resin composition and the residue 15 of the solder left on the bottom of the semiconductor device in the same manner as described above. (See FIG. 4.)
• thermosetting resin compositions in accordance with the present invention may be prepared from the components as noted below in Tables la-lf.
• Sample Nos. 24-30 were prepared substantially as Sample Nos. 17-23, save for the curable resin, which was replaced with a comparable amount of an epoxy resin -- either bisphenol-A-type epoxy resin or bisphenol-F-type epoxy resin. See Table Id.
• Sample Nos. 40-48 were prepared as Sample Nos. 31-39, save for the curable resin, which was replaced with a comparable amount of an epoxy resin — either bisphenol-A-type epoxy resin or bisphenol-F-type epoxy resin.
• the comparative samples are presented in Table If.
• compositions were observed to have the viscosity values in mPa ⁇ s as set forth in Table 2.
• reaction products of the composition were observed to have a glass transition temperature (“Tg”) as measured by thermal mechanical analysis (“TMA”), cd and ⁇ 2 , and expansion when cycled between extreme temperatures of about 0°C and about 140°C as set forth in Tables 2a-2d.
• Tg glass transition temperature
• TMA thermal mechanical analysis
• the viscosity of the majority of these samples is suitable for use as an underfill sealant. That is, a viscosity less than about 10,000 mPa • s .
• the Tg values for the samples listed are suitable for use as an underfill sealant.
• the coefficient of thermal expansion values for the samples were between about 0°C and about 140°C, which is suitable for use as an underfill sealant .
• thermosetting resin composition was applied to the periphery of the CSP by means of a dispenser, and then cured by heating in an environment where the temperature was held at about at 150°C for a period of time of about 60 minutes.
• the thermosetting resin composition penetrated into the space between the semiconductor device and the circuit board before curing completely.
• the area around the CSP fixed to the circuit board with the thermosetting resin composition as described above was heated by applying hot air at 250°C for 1 minute. Then, the CSP could be easily removed by inserting a metal piece between the CSP and the glass- reinforced epoxy board, and lifting the CSP.
• the glass-reinforced epoxy board was kept at a temperature of about 100°C by placing it on a hot plate (or by heating it with a far-infrared heater or the like) , the resin left on the glass-reinforced epoxy board was allowed to swell with a solvent such as PS-1 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) or 7360 (manufactured by Loctite Corporation), and then scraped off with a spatula.
• PS-1 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.
• 7360 manufactured by Loctite Corporation
• FIG. 5 shows the temperature range at which a cured reaction product of a XBO-based composition curable through a cationic cure mechanism (Sample No. 23) in accordance with the invention loses weight by virtue of thermal degradation as it is exposed to an increase in temperature contrasted to a cured reaction product of a composition based on bisphenol-F-type epoxy resin curable through a cationic cure mechanism (Sample No. 30) .
• FIG. 6 shows the temperature range at which a cured reaction product of a MPG-based composition (Sample No. 17) in accordance with the invention loses weight by virtue of thermal degradation as it is exposed to an increase in temperature contrasted to a cured reaction product of a composition based on bisphenol-F-type epoxy resin (Sample No. 29) . 40
• FIG. 7 shows the temperature range at which a cured reaction product of a CBO-based composition curable through a cationic cure mechanism (Sample No. 32) in accordance with the invention loses weight by virtue of thermal degradation as it is exposed to an increase in temperature contrasted to a cured reaction product of a composition based on bisphenol-F-type epoxy resin curable through a cationic cure mechanism (Sample No. 40) .

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• Engineering & Computer Science (AREA)
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• Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
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• 2000
  • 2000-06-16 CN CNB008096821A patent/CN1178287C/zh not_active Expired - Fee Related
  • 2000-06-16 AU AU57227/00A patent/AU5722700A/en not_active Abandoned
  • 2000-06-16 KR KR10-2001-7016219A patent/KR100372211B1/ko not_active IP Right Cessation
  • 2000-06-16 WO PCT/US2000/011878 patent/WO2000079582A1/en not_active Application Discontinuation
  • 2000-06-16 JP JP2001505052A patent/JP4718070B2/ja not_active Expired - Fee Related
  • 2000-06-16 CA CA002374187A patent/CA2374187A1/en not_active Abandoned
  • 2000-06-16 EP EP00942630A patent/EP1194953A4/en not_active Withdrawn
  • 2000-06-16 MX MXPA01013054A patent/MXPA01013054A/es unknown

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