WO2016111283A1 - ダイシングテープ - Google Patents
ダイシングテープ Download PDFInfo
- Publication number
- WO2016111283A1 WO2016111283A1 PCT/JP2016/050102 JP2016050102W WO2016111283A1 WO 2016111283 A1 WO2016111283 A1 WO 2016111283A1 JP 2016050102 W JP2016050102 W JP 2016050102W WO 2016111283 A1 WO2016111283 A1 WO 2016111283A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dicing tape
- mass
- meth
- dicing
- parts
- Prior art date
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- 230000001070 adhesive effect Effects 0.000 claims abstract description 41
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- 229930003836 cresol Natural products 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- KORSJDCBLAPZEQ-UHFFFAOYSA-N dicyclohexylmethane-4,4'-diisocyanate Chemical compound C1CC(N=C=O)CCC1CC1CCC(N=C=O)CC1 KORSJDCBLAPZEQ-UHFFFAOYSA-N 0.000 description 1
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Natural products C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- RJLZSKYNYLYCNY-UHFFFAOYSA-N ethyl carbamate;isocyanic acid Chemical group N=C=O.CCOC(N)=O RJLZSKYNYLYCNY-UHFFFAOYSA-N 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
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- 238000009472 formulation Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 239000011630 iodine Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- WBYWAXJHAXSJNI-UHFFFAOYSA-N methyl p-hydroxycinnamate Natural products OC(=O)C=CC1=CC=CC=C1 WBYWAXJHAXSJNI-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- KXAVXHYIOCQWIB-UHFFFAOYSA-N n-(dimethylaminooxy)-n-methylmethanamine Chemical compound CN(C)ON(C)C KXAVXHYIOCQWIB-UHFFFAOYSA-N 0.000 description 1
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- SJPFBRJHYRBAGV-UHFFFAOYSA-N n-[[3-[[bis(oxiran-2-ylmethyl)amino]methyl]phenyl]methyl]-1-(oxiran-2-yl)-n-(oxiran-2-ylmethyl)methanamine Chemical compound C1OC1CN(CC=1C=C(CN(CC2OC2)CC2OC2)C=CC=1)CC1CO1 SJPFBRJHYRBAGV-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
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- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
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- 239000002904 solvent Substances 0.000 description 1
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- QJVXKWHHAMZTBY-GCPOEHJPSA-N syringin Chemical compound COC1=CC(\C=C\CO)=CC(OC)=C1O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 QJVXKWHHAMZTBY-GCPOEHJPSA-N 0.000 description 1
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- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
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- RRBYUSWBLVXTQN-UHFFFAOYSA-N tricyclene Chemical compound C12CC3CC2C1(C)C3(C)C RRBYUSWBLVXTQN-UHFFFAOYSA-N 0.000 description 1
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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
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/50—Tape automated bonding [TAB] connectors, i.e. film carriers; Manufacturing methods related thereto
-
- 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
Definitions
- the present invention relates to a dicing tape used in an electronic component manufacturing process.
- the semiconductor wafer or substrate is applied to each process, such as cutting a dicing tape (dicing), stretching the dicing tape (expanding), and peeling the dicing tape from the dicing tape (pickup). Is done.
- the dicing tape used in these processes has sufficient adhesive strength to the cut element chips (chips) in the dicing process, but the adhesive strength is reduced to the extent that no adhesive remains during the pick-up process. It is hoped that
- a dicing tape there is one in which a pressure-sensitive adhesive layer that undergoes a polymerization and curing reaction by ultraviolet rays or the like is coated on a base film that is transparent to an actinic ray such as ultraviolet rays and / or electron beams.
- an actinic ray such as ultraviolet rays and / or electron beams.
- Patent Document 1 and Patent Document 2 disclose a compound (polyfunctional) having a photopolymerizable unsaturated double bond in a molecule, which can be three-dimensionally reticulated on the base film surface by, for example, active light.
- a dicing tape coated with a pressure-sensitive adhesive containing a functional oligomer) is disclosed.
- chip jumping and chipping are likely to occur in the dicing process of a semiconductor wafer or substrate, which may cause a decrease in yield.
- the present invention mainly aims to provide a dicing tape that can suppress chip jumping and chipping in a dicing process even in a small and thin electronic component, can be easily picked up, and is less likely to have adhesive residue. .
- the present invention is a dicing tape formed by laminating a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive composition on a base film, and the pressure-sensitive adhesive composition comprises 100 parts by weight of a (meth) acrylic acid ester copolymer, 5 to 250 parts by weight of a photopolymerizable compound, 0.1 to 20 parts by weight of a curing agent and 0.1 to 20 parts by weight of a photopolymerization initiator, and the (meth) acrylic acid ester copolymer is methyl (meth) Monomers having 35 to 85% by mass of acrylate units, 10 to 60% by mass of 2-ethylhexyl (meth) acrylate units, 0.5 to 10% by mass of monomer units having a carboxyl group, and monomers having a hydroxyl group
- the photopolymerizable compound is a urethane acrylate oligomer containing 0.05 to 5% by mass of units, the weight average molecular weight is 4,000 to 8,000, and
- the present inventors have found that when an adhesive layer having a thickness of 3 to 7 ⁇ m is formed using an adhesive having a specific composition, chipping and chip jumping are performed. The inventors have found that it is possible to improve the pick-up property while effectively suppressing adhesive residue, and have completed the present invention.
- the curing agent is a polyfunctional isocyanate curing agent or a polyfunctional epoxy curing agent.
- the adhesive force with respect to the mirror surface of the silicon wafer measured according to JISZ0237 of the dicing tape is 5.0 N / 20 mm or more.
- a dicing step (c) a light irradiation step of irradiating the dicing tape with an actinic ray, (d) an expanding step of stretching the dicing tape to widen the interval between the semiconductor chips or semiconductor components, and (e) the above
- a method for manufacturing an electronic component including a pickup step of picking up a semiconductor chip or a semiconductor component from a dicing tape, wherein the dicing tape is the dicing tape described above.
- the present invention provides a dicing tape that can suppress chip skipping and chipping in a dicing process even in a small and thin electronic component, can be easily picked up, and hardly causes adhesive residue.
- the pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer of the dicing tape of the present invention is 100 parts by weight of a (meth) acrylic acid ester copolymer, 5 to 250 parts by weight of a photopolymerizable compound, and 0.1 to 20 parts by weight of a curing agent. And 0.1 to 20 parts by mass of a photopolymerization initiator.
- the (meth) acrylic acid ester copolymer has a methyl (meth) acrylate unit of 35 to 85% by mass (preferably 45 to 75% by mass, more preferably 50 to 70% by mass, more preferably 55 to 65% by mass). 10 to 60% by mass (preferably 20 to 50% by mass, more preferably 25 to 45% by mass, more preferably 30 to 40% by mass) of 2-ethylhexyl (meth) acrylate unit, and a unit having a carboxyl group.
- the monomer unit is 0.5 to 10% by mass (preferably 2 to 7% by mass, more preferably 3 to 6% by mass, and further preferably 4 to 5% by mass), and the monomer unit having a hydroxyl group is 0.00%.
- 05-5 mass% preferably 0.1-3 mass%, more preferably 0.2-2 mass%, more preferably 0.3-1 mass%, more preferably 0.4-0.7 mass%) The amount%) containing. Since the (meth) acrylic acid ester copolymer is composed of such monomer units, the adhesive strength is sufficiently high even though the thickness of the pressure-sensitive adhesive layer is relatively small of 3 to 7 ⁇ m. A dicing tape can be obtained.
- the adhesive force with respect to the mirror surface of the silicon wafer measured based on JISZ0237 shall be 5.0 N / 20mm or more about the adhesive force of a dicing tape.
- Examples of the monomer having a carboxyl group include (meth) acrylic acid, crotonic acid, maleic acid, itaconic acid, fumaric acid, acrylamide N-glycolic acid, and cinnamic acid. preferable.
- Examples of the functional group-containing monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl (meth) acrylate. ) Acrylate is preferred.
- the blending amount of the photopolymerizable compound is 5 to 250 parts by weight, preferably 40 to 200 parts by weight, based on 100 parts by weight of the (meth) acrylic acid ester copolymer.
- the blending amount of the photopolymerizable compound is reduced, the peelability of the dicing tape after irradiation with actinic rays such as ultraviolet rays is lowered, and the pick-up failure of the semiconductor chip is likely to occur.
- the blending amount of the photopolymerizable compound is increased, the adhesive strength is excessively reduced by the light irradiation process, and chip separation occurs in the pickup process, which causes a decrease in productivity.
- the photopolymerizable compound usable in the present invention is a urethane acrylate oligomer having a weight average molecular weight of 4,000 to 8,000 and an unsaturated double bond functional group number of 10 to 15.
- the weight average molecular weight is small, the pressure-sensitive adhesive becomes flexible, so that chipping is likely to occur.
- the weight average molecular weight is large, the adhesion to the adherend is lowered, and chip fly tends to occur.
- the number of unsaturated double bond functional groups is small, the curability of the adhesive after light irradiation such as ultraviolet rays is reduced, and pickup failure tends to occur.
- light irradiation such as ultraviolet rays is performed.
- the urethane acrylate oligomer is obtained by reacting a (meth) acrylate having a hydroxy group with a terminal isocyanate urethane prepolymer obtained by reacting a polyol compound such as polyester type or polyether type with a polyvalent isocyanate compound.
- polyol compound examples include ethylene glycol, propylene glycol, butanediol, hexanediol, neopentyl glycol, diethylene glycol, triethylene glycol, pentanediol, glycerin, trimethylolpropane, trimethylolethane, and pentaerythritol.
- polyvalent isocyanate compound examples include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylene diisocyanate, diphenylmethane 4,4-diisocyanate, trimethylhexamethylene diisocyanate.
- Hexamethylene diisocyanate, isophorone diisocyanate, and the like are used.
- Examples of the (meth) acrylate having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, polyethylene glycol (meth) acrylate, pentaerythritol triacrylate, and glycidol di (meth). Acrylate, dipentaerythritol monohydroxypentaacrylate, etc. are used.
- the compounding amount of the curing agent is 0.1 part by mass or more and 20 parts by mass or less, and preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer. If the amount of the curing agent is reduced, adhesive residue is likely to occur. On the other hand, when the compounding amount of the curing agent is increased, insufficient adhesive strength or chip dispersion occurs, which causes a decrease in productivity.
- the curing agent examples include a polyfunctional isocyanate curing agent, a polyfunctional epoxy curing agent, an azirine compound, and a melamine compound, and a polyfunctional isocyanate curing agent and a polyfunctional epoxy curing agent are preferable.
- a polyfunctional epoxy curing agent or a polyfunctional isocyanate curing agent as at least a part of the above curing agent, it is possible to selectively cause a functional group-containing monomer having a carboxyl group to react and disappear. It is possible to adjust the amount of the functional group-containing monomer having a carboxyl group after curing.
- polyfunctional isocyanate curing agent examples include an aromatic polyisocyanate curing agent, an aliphatic polyisocyanate curing agent, and an alicyclic polyisocyanate curing agent.
- the aromatic polyisocyanate is not particularly limited, and for example, 1,3-phenylene diisocyanate, 4,4′-diphenyl diisocyanate, 1,4-phenylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2, , 6-tolylene diisocyanate, 4,4′-toluidine diisocyanate, 2,4,6-triisocyanate toluene, 1,3,5-triisocyanate benzene, dianisidine diisocyanate, 4,4′-diphenyl ether diisocyanate, 4,4 ', 4 "-triphenylmethane triisocyanate, ⁇ , ⁇ '-diisocyanate-1,3-dimethylbenzene, ⁇ , ⁇ '-diisocyanate-1,4-dimethylbenzene, ⁇ , ⁇ '-diisocyanate-1,4- Diethy
- the aliphatic polyisocyanate is not particularly limited.
- diisocyanate and 2,4,4-trimethylhexamethylene diisocyanate examples thereof include diisocyanate and 2,4,4-trimethylhexamethylene diisocyanate.
- the alicyclic polyisocyanate is not particularly limited.
- 1,3-phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 1,4-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate 4,4′-toluidine diisocyanate and hexamethylene diisocyanate are preferably used.
- the polyfunctional epoxy curing agent mainly means a compound having two or more epoxy groups and one or more tertiary nitrogen atoms.
- the compounding quantity of a photoinitiator is 0.1 mass part or more and 20 mass parts or less with respect to 100 mass parts of (meth) acrylic acid ester polymers, and 1 mass part or more and 10 mass parts or less are preferable.
- the blending amount is too small, the peelability from the dicing tape after light irradiation is lowered, and the pick-up failure of the semiconductor chip is likely to occur.
- the photopolymerization initiator bleeds out to the pressure-sensitive adhesive surface, causing contamination.
- benzoin benzoin alkyl ethers
- acetophenones anthraquinones
- thioxanthones ketals
- benzophenones or xanthones are used.
- benzoin examples include benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin propyl ether.
- acetophenones examples include benzoin alkyl ethers, acetophenone, 2,2-dimethoxy-2-acetophenone, 2,2-diethoxy-2-acetophenone, 1,1-dichloroacetophenone, and the like.
- Anthraquinones include 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiarybutylanthraquinone, 1-chloroanthraquinone and the like.
- Examples of thioxanthones include 2,4-dimethylthioxanthone, 2,4-diisopropylthioxanthone, 2-chlorothioxanthone, and 2,4-diisopropylthioxanthone.
- Examples of ketals include acetophenone dimethyl ketal, benzyldimethylmethal, benzyldiphenylsulfide, tetramethylthiuram monosulfide, azobisisobutyronitrile, dibenzyl, diacetyl, ⁇ -chloranthraquinone, and the like.
- the photopolymerization initiator may be used in combination with one or more conventionally known photopolymerization accelerators, if necessary.
- group, a tertiary amine, etc. can be used for a photoinitiator.
- the tertiary amine include triethylamine, tetraethylpentamine, dimethylamino ether and the like.
- the tackifier resin is a terpene phenol resin that is completely or partially hydrogenated with a terpene phenol resin.
- the terpene phenol resin can be produced, for example, by reacting 1 mol of a terpene compound with 0.1 to 50 phenols.
- terpene compounds include myrcene, alloocimene, osmene, ⁇ -pinene, ⁇ -pinene, dipentene, limonene, ⁇ -ferrandrene, ⁇ -terpinene, ⁇ -terpinene, terpinolene, 1,8-cineole, 1,4-cineole, Examples include ⁇ -terpineol, ⁇ -terpineol, ⁇ -terpineol, camphene, tricyclene, sabinene, paramentadienes, and carenes. Among these compounds, ⁇ -pinene, ⁇ -pinene, limonene, myrcene, alloocimene and ⁇ -terpinene are particularly preferably used in the present invention.
- phenols examples include, but are not limited to, phenol, cresol, xylenol, catechol, resorcin, hydroquinone, bisphenol A, and the like.
- the ratio of phenols in the terpene phenol resin is about 25 to 50 mol%, but is not limited thereto.
- the hydroxyl value of the fully or partially hydrogenated terpene phenol resin is preferably 50 to 250.
- the reaction with the isocyanate curing agent is not sufficient, bleeds out to the surface of the pressure-sensitive adhesive, causing contamination, and when it exceeds 250, the viscosity increases and the (meth) acrylic acid ester This is because uneven mixing with a polymer or the like occurs and the pickup characteristics are not stable.
- the hydrogenation method is not particularly limited, and for example, a noble metal such as palladium, ruthenium, rhodium or the like supported on a carrier such as activated carbon, activated alumina, or diatomaceous earth is used as a catalyst.
- the hydrogenation rate can be measured by bromine number measurement, iodine number measurement or the like.
- the hydrogenation rate of the completely or partially hydrogenated terpene phenol resin is preferably 30 mol% or more, more preferably 70 mol% or more.
- the amount is less than 30 mol%, the adhesive force is not sufficiently lowered due to the reaction inhibition of the photopolymerizable compound by irradiation with actinic rays, and the pickup property is lowered.
- the blending ratio of the completely or partially hydrogenated terpene phenol resin is preferably 0.5 parts by mass or more and 100 parts by mass or less, and 100 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer. Less than the mass part is more preferable. If the completely or partially hydrogenated terpene phenol resin is 0.5 parts by mass or more, the adhesive strength is not too low, so the retention of the semiconductor chip is maintained during dicing, and if it is 100 parts by mass or less, the pickup is poor. Can be suppressed.
- the thickness of the pressure-sensitive adhesive layer is 3 to 7 ⁇ m, preferably 4 to 6 ⁇ m. If the pressure-sensitive adhesive layer is too thick, chipping tends to occur. On the other hand, if the pressure-sensitive adhesive layer is too thin, the adhesive strength becomes too low, chip retention during dicing is reduced, and chip fly may occur, or peeling may occur between the ring frame and the sheet.
- Base film examples of the material for the base film include polyvinyl chloride, polyethylene terephthalate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid-acrylic acid ester film, ethylene-ethyl acrylate copolymer, polyethylene, polypropylene, and propylene-based copolymer. Polymers, ethylene-acrylic acid copolymers, and ionomer resins obtained by crosslinking ethylene- (meth) acrylic acid copolymers, ethylene- (meth) acrylic acid- (meth) acrylic acid ester copolymers, etc. with metal ions Etc.
- the base film may be a mixture or copolymer of these resins, and may be a laminate of films or sheets made of these resins.
- an ionomer resin as a material for the base film.
- ionomer resins if an ionomer resin obtained by crosslinking a copolymer having an ethylene unit, a methacrylic acid unit, and a (meth) acrylic acid alkyl ester unit with a metal ion such as Na + , K + , or Zn 2+ is used, cutting is performed. The dust suppressing effect is remarkable and is preferably used.
- the base film may be a single layer or multilayer film or sheet made of the above materials, or may be a laminate of films made of different materials.
- the thickness of the base film is 50 to 200 ⁇ m, preferably 70 to 150 ⁇ m.
- the base film is preferably subjected to an antistatic treatment.
- an antistatic treatment there are a treatment of adding an antistatic agent to the base film, a treatment of applying the antistatic agent to the surface of the base film, and a treatment by corona discharge.
- a quaternary amine salt monomer can be used as the antistatic agent.
- the quaternary amine salt monomer include dimethylaminoethyl (meth) acrylate quaternary chloride, diethylaminoethyl (meth) acrylate quaternary chloride, methylethylaminoethyl (meth) acrylate quaternary chloride, p-dimethyl.
- examples include aminostyrene quaternary chloride and p-diethylaminostyrene quaternary chloride. Of these, dimethylaminoethyl methacrylate quaternary chloride is preferred.
- the adhesive may be applied to one side of the base film, and the slip agent and / or the antistatic agent may be applied to the back side thereof.
- an antistatic agent may be kneaded into the resin of the base film to form a sheet.
- a slipping agent In order to improve the expandability after dicing, a slipping agent can be applied to the adhesive non-contact surface of the base film, or a slipping agent can be kneaded into the base film.
- the slip agent is not particularly limited as long as it is a substance that lowers the coefficient of friction between the dicing tape and the expanding device.
- silicone compounds such as silicone resin and (modified) silicone oil, fluororesin, hexagonal boron nitride, carbon black, And molybdenum disulfide. These friction reducing agents may mix a plurality of components. Since manufacture of an electronic component is performed in a clean room, it is preferable to use a silicone compound or a fluororesin.
- a copolymer having a silicone macromonomer unit is particularly preferred because it has good compatibility with the antistatic layer and can achieve a balance between antistatic properties and expandability.
- a dicing tape is affixed on a semiconductor wafer or a substrate and a ring frame.
- the semiconductor wafer may be a conventional general-purpose wafer such as a silicon wafer and a gallium nitride wafer, a silicon carbide wafer, or a sapphire wafer.
- the substrate may be a general-purpose substrate such as a package substrate in which a chip is sealed with a resin, an LED package substrate, or a ceramic substrate.
- the dicing tape is irradiated with actinic rays such as ultraviolet rays and electron beams.
- actinic ray is preferably irradiated from the base film side.
- the ultraviolet light source a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or a metal halide lamp can be used.
- an electron beam may be used instead of ultraviolet rays, and ⁇ -rays, ⁇ -rays, and ⁇ -rays can be used as a light source for the electron beams.
- the light-sensitive adhesive layer is three-dimensionally reticulated and cured by light irradiation, and the adhesive strength of the pressure-sensitive adhesive layer is reduced.
- the dicing tape according to the present invention does not excessively adhere to the semiconductor wafer or the substrate even when heated, a sufficient decrease in adhesive force can be obtained by irradiation with ultraviolet rays or the like.
- the dicing tape is stretched to widen the distance between the semiconductor chips or semiconductor components, and the chip or components are pushed up with a needle pin or the like. Thereafter, the chip or component is adsorbed by a vacuum collet or air tweezers, peeled off from the adhesive layer of the dicing tape, and picked up.
- a sufficient decrease in the adhesive strength is obtained by irradiation with ultraviolet rays or the like, so that peeling between the chip or component and the pressure-sensitive adhesive layer is facilitated, and good pick-up properties are obtained. And no defects such as glue residue occur.
- a method of forming a pressure-sensitive adhesive layer on a substrate film to obtain a dicing tape for example, a method of directly applying a pressure-sensitive adhesive on a substrate film with a coater such as a gravure coater, comma coater, bar coater, knife coater or roll coater Alternatively, there is a method in which a pressure-sensitive adhesive is applied to a release film and bonded to a base film after drying.
- the adhesive may be printed on the base film by convex plate printing, concave plate printing, flat plate printing, flexographic printing, offset printing, screen printing, or the like.
- the dicing tape of the present invention is suitably used for attaching an electronic component assembly called a workpiece in a dicing step and a back grinding step, which are electronic component manufacturing steps.
- compositions in Tables 1 to 3 represent parts by mass.
- curing agent, and a photoinitiator represents a mass part when a (meth) acrylic acid ester copolymer is 100 parts.
- Details of the base film, photopolymerizable compound, curing agent, and photopolymerization initiator are as follows.
- a weight average molecular weight is the value measured as a weight average molecular weight of polystyrene conversion by the gel permeation chromatography method (GPC). Specifically, it is as follows. Equipment: GPC-8020 SEC system (manufactured by Tosoh Corporation) Column: TSK Guard HZ-L + HZM-N 6.0 ⁇ 150 mm ⁇ 3 Flow rate: 0.5ml / min Detector: RI-8020 Concentration: 0.2wt / Vol% Injection volume: 20 ⁇ L Column temperature: 40 ° C System temperature: 40 ° C Solvent: THF Calibration curve: Prepared using standard polystyrene (manufactured by PL), and the weight average molecular weight (Mw) was expressed in terms of polystyrene.
- GPC gel permeation chromatography method
- Resin film A Mainly composed of an ionomer resin film having a thickness of 80 ⁇ m and a Zn salt of ethylene-methacrylic acid-acrylic acid 2-methylpropyl copolymer. MFR 2.8 g / 10 min (JIS K7210 method, 210 ° C.), manufactured by Mitsui DuPont Polychemical Co., Ltd. (commercial product).
- Photopolymerizable compound A a compound obtained by reacting an isocyanate of hexamethylene diisocyanate with a hydroxyl group-containing acrylate containing dipetaerythritol pentaacrylate as a main component, a weight average molecular weight of 7,500, and an unsaturated double bond Urethane acrylate oligomer (synthetic product) having 10 functional groups.
- Photopolymerizable compound B Urethane acrylate oligomer with a weight average molecular weight of 4,200 and unsaturated double bond functional group number 10 (synthesized product) synthesized by the same production method as photopolymerizable compound
- Photopolymerizable compound C urethane acrylate oligomer (synthetic product) having a weight average molecular weight of 2,100 and an unsaturated double bond functional group of 10 synthesized by the same production method as photopolymerizable compound
- Photopolymerizable compound D Urethane acrylate oligomer having a weight average molecular weight of 10,300 and an unsaturated double bond functional group of 10 synthesized by the same production method as that of photopolymerizable compound A (synthetic product)
- Photopolymerizable compound E a compound obtained by reacting an isocyanate of isophorone diisocyanate with a hydroxyl group-containing acrylate containing dipetaerythr
- Curing agent A Trimethylolpropane adduct of 2,4-tolylene diisocyanate (commercially available)
- Curing agent B Trimethylolpropane adduct of hexamethylene diisocyanate (commercially available)
- Curing agent C N, N, N ′, N′-tetraglycidyl-m-xylylenediamine (commercially available)
- Photopolymerization initiator A 1-hydroxycyclohexyl phenyl ketone (commercially available)
- Photopolymerization initiator B benzyl dimethyl ketal (commercially available)
- the conditions for the dicing process were as follows.
- Dicing machine DAD341 manufactured by DISCO Dicing blade: NBC-ZH205O-27HEEE made by DISCO Dicing blade shape: outer diameter 55.56 mm, blade width 35 ⁇ m, inner diameter 19.05 mm
- Dicing blade rotation speed 40,000 rpm
- Dicing blade feed speed 100 mm / sec.
- Dicing size 1.0 mm square cutting depth: 30 ⁇ m
- Cutting water volume 1.0 l / min
- Chip skipping is less than 5% ⁇ (Good): Chip skipping is 5% or more and less than 10% ⁇ (Not possible): Chip skipping is 10% or more
- Chip pickup success rate is 95% or more
- Chip pickup success rate is 80% or more and less than 95%
- Chip pickup success rate is less than 80%
- (2-3) Chipping Chipping is performed by randomly selecting 50 picked-up chips, observing the four sides of the back of the chip with a 500x microscope, and determining the maximum chip size in the center direction as follows. It was evaluated by. ⁇ (excellent): chip size is less than 25 ⁇ m ⁇ (good): chip size is 25 ⁇ m or more and less than 50 ⁇ m ⁇ (impossible): chip size is 50 ⁇ m or more
- a fouling dicing tape was affixed to the mirror surface of the silicon wafer, and after 20 minutes, ultraviolet rays were irradiated at 150 mJ / cm 2 with a high-pressure mercury lamp, and then the dicing tape was peeled off.
- the number of particles of 0.28 ⁇ m or more remaining on the mirror surface (bonding surface) of the silicon wafer was measured with a particle counter.
- X (impossible) 2000 or more particles.
- Chip variation was evaluated according to the following criteria based on the rate at which the semiconductor chip adjacent to the semiconductor chip to be picked up was scattered due to the impact of pin push-up in the pickup process. ⁇ (excellent): chip variation is less than 1% ⁇ (good): chip variation is 1% or more and less than 3% ⁇ (impossible): chip variation is 3% or more
- Comparative Example 1 the contamination was deteriorated because there were too few methyl (meth) acrylate units.
- Comparative Example 2 since there were too many methyl (meth) acrylate units, the chip retention was deteriorated, and chip scattering was likely to occur.
- Comparative Example 3 the chip retention was deteriorated because there were too few monomer units having a carboxyl group.
- Comparative Example 4 since there were too many monomer units having a carboxyl group, pick-up property and contamination were deteriorated.
- Comparative Example 5 since the monomer unit having a hydroxyl group was too small, the contamination was deteriorated.
- Comparative Example 6 since there were too many monomer units having a hydroxyl group, chip scattering was likely to occur. In Comparative Example 7, since the amount of the photopolymerizable compound was too small, the chip holding property and the pickup property were deteriorated. In Comparative Example 8, since there were too many photopolymerizable compounds, contamination
- Comparative Example 12 since there were too many curing agents, chip retention and contamination were deteriorated, and chip scattering was likely to occur. In Comparative Example 13, the pick-up property deteriorated because there was too little photopolymerization initiator. In Comparative Example 14, since there were too many photopolymerization initiators, contamination
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Abstract
Description
好ましくは、前記ダイシングテープのJISZ0237に準拠して測定したシリコンウエハの鏡面に対する粘着力が5.0N/20mm以上であることを特徴とする。
本発明の別の観点によれば、(a)半導体ウエハ又は基板とリングフレームとにダイシングテープを貼り付ける貼付工程と、(b)前記半導体ウエハ又は基板をダイシングして半導体チップ又は半導体部品にするダイシング工程と、(c)前記ダイシングテープに活性光線を照射する光照射工程と、(d)前記半導体チップ又は半導体部品同士の間隔を広げるため、前記ダイシングテープを引き伸ばすエキスパンド工程と、(e)前記ダイシングテープから半導体チップ又は半導体部品をピックアップするピックアップ工程を含み、前記ダイシングテープは、上記記載のダイシングテープである、電子部品の製造方法が提供される。
本発明のダイシングテープの粘着剤層の形成に用いる粘着剤組成物は(メタ)アクリル酸エステル共重合体100質量部と、光重合性化合物5~250質量部、硬化剤0.1~20質量部と光重合開始剤0.1~20質量部を含むものである。
(メタ)アクリル酸エステル共重合体は、メチル(メタ)アクリレート単位を35~85質量%(好ましくは45~75質量%、さらに好ましくは50~70質量%、さらに好ましくは55~65質量%)、2-エチルへキシル(メタ)アクリレート単位を10~60質量%(好ましくは20~50質量%、さらに好ましくは25~45質量%、さらに好ましくは30~40質量%)、カルボキシル基を有する単量体単位を0.5~10質量%(好ましくは2~7質量%、さらに好ましくは3~6質量%、さらに好ましくは4~5質量%)、ヒドロキシル基を有する単量体単位を0.05~5質量%(好ましくは0.1~3質量%、さらに好ましくは0.2~2質量%、さらに好ましくは0.3~1質量%、さらに好ましくは0.4~0.7質量%)含有する。(メタ)アクリル酸エステル共重合体がこのような単量体単位で構成されていることによって、粘着剤層の厚さが3~7μmという比較的小さいにも関わらず、粘着力が十分に高いダイシングテープを得ることが可能になる。なお、ダイシングテープの粘着力は、JIS Z 0237に準拠して測定したシリコンウエハの鏡面に対する粘着力が5.0N/20mm以上にすることが好ましい。
光重合性化合物の配合量は、(メタ)アクリル酸エステル共重合体100質量部に対して5~250質量部であり、40~200質量部が好ましい。光重合性化合物の配合量を少なくすると、紫外線などの活性光線の照射後のダイシングテープの剥離性が低下し、半導体チップのピックアップ不良を生じやすくなる。一方、光重合性化合物の配合量を多くすると、光照射工程により粘着力が低下しすぎてしまい、ピックアップ工程でチップばらけが生じてしまい、生産性低下の要因となる。
硬化剤を配合量は、(メタ)アクリル酸エステル共重合体100質量部に対して、0.1質量部以上20質量部以下であり、1質量部以上10質量部以下であることが好ましい。硬化剤の配合量を少なくすると、糊残りを生じやすくなる。一方、硬化剤の配合量を多くすると粘着力の不足やチップばらけを生じてしまい、生産性低下の要因となる。
光重合開始剤の配合量は、(メタ)アクリル酸エステル重合体100質量部に対して0.1質量部以上20質量部以下であり、1質量部以上10質量部以下が好ましい。配合量が少な過ぎると、光照射後のダイシングテープからの剥離性が低下し、半導体チップのピックアップ不良を生じやすくなる。一方、配合量が多過ぎると、光重合開始剤が粘着剤表面へブリードアウトし、汚染の原因となる。
アセトフェノン類としては、例えばベンゾインアルキルエーテル類、アセトフェノン、2,2-ジメトキシ-2-アセトフェノン、2,2―ジエトキシ-2-アセトフェノン、1,1-ジクロロアセトフェノンなどがある。
アントラキノン類としては、2-メチルアントラキノン、2-エチルアントラキノン、2-ターシャリブチルアントラキノン、1-クロロアントラキノンなどがある。
チオキサントン類としては、例えば2,4-ジメチルチオキサントン、2,4-ジイソプロピルチオキサントン、2-クロロチオキサントン、2,4-ジイソプロピルチオキサントンなどがある。
ケタール類としては、例えばアセトフェノンジメチルケータル、ベンジルジメチルメタール、ベンジルジフエニルサルフアイド、テトラメチルチウラムモノサルフアイド、アゾビスイソブチロニトリル、ジベンジル、ジアセチル、β-クロールアンスラキノンなどがある。
粘着剤組成物には、粘着付与樹脂を配合してもよい。粘着付与樹脂としては、テルペンフェノール樹脂を完全又は部分水添されたテルペンフェノール樹脂である。
粘着剤組成物には、例えば、軟化剤、老化防止剤、充填剤、導電剤、紫外線吸収剤、及び光安定剤等の各種添加剤を添加してもよい。
基材フィルムの材料としては、例えば、ポリ塩化ビニル、ポリエチレンテレフタレート、エチレン-酢酸ビニル共重合体、エチレン-アクリル酸-アクリル酸エステルフィルム、エチレン-エチルアクリレート共重合体、ポリエチレン、ポリプロピレン、プロピレン系共重合体、エチレン-アクリル酸共重合体、および、エチレン-(メタ)アクリル酸共重合体やエチレン-(メタ)アクリル酸-(メタ)アクリル酸エステル共重合体等を金属イオンで架橋したアイオノマ樹脂などが挙げられる。基材フィルムは、これら樹脂の混合物又は共重合体であってよく、これら樹脂からなるフィルムやシートの積層体であってもよい。
ダイシング後のエキスパンド性を向上させるために、基材フィルムの粘着剤非接触面に滑り剤を施したり、基材フィルムに滑り剤を練り込むことができる。
まず、貼付工程において、ダイシングテープを半導体ウエハ又は基板とリングフレームに貼り付ける。半導体ウエハは、シリコンウエハおよびガリウムナイトライドウエハ、炭化ケイ素ウエハ、サファイアウエハなどの従来汎用のウエハであってよい。基板は樹脂でチップを封止したパッケージ基板、LEDパッケージ基板、セラミック基板などの汎用の基板であってよい。
ダイシング工程では、半導体ウエハ又は基板をダイシングして半導体チップ又は半導体部品にする。
光照射工程では、前記ダイシングテープに紫外線や電子線等の活性光線を照射する。活性光線は、基材フィルム側から照射することが好ましい。紫外線の光源としては、低圧水銀灯、高圧水銀灯、超高圧水銀灯、メタルハライドランプを用いることができる。また、紫外線に替えて電子線を用いてもよく、電子線の光源としてはα線、β線、γ線を用いることができる。
エキスパンド・ピックアップ工程では、半導体チップ又は半導体部品同士の間隔を広げるためダイシングテープを引き伸ばし、チップ又は部品をニードルピン等で突き上げる。その後、チップ又は部品を真空コレットまたはエアピンセット等で吸着し、ダイシングテープの粘着剤層から剥離してピックアップする。この際、本発明に係るダイシングテープでは紫外線等の照射により十分な接着力の低下が得られているため、チップ又は部品と粘着剤層との間の剥離が容易となり、良好なピックアップ性が得られ、糊残りなどの不良が生じることもない。
基材フィルム上に粘着剤層を形成してダイシングテープとする方法としては、例えばグラビアコーター、コンマコーター、バーコーター、ナイフコーター又はロールコーターといったコーターで基材フィルム上に粘着剤を直接塗布する方法や、剥離フィルムに粘着剤を塗布/乾燥後に基材フィルムに貼り合わせる方法がある。凸板印刷、凹板印刷、平板印刷、フレキソ印刷、オフセット印刷、又はスクリーン印刷等で基材フィルム上に粘着剤を印刷してよい。
装置:GPC-8020 SEC システム(東ソー社製)
カラム:TSK Guard HZ-L + HZM-N 6.0×150mm×3
流量:0.5ml/min
検出器:RI-8020
濃度:0.2wt/Vol%
注入量:20μL
カラム温度:40℃
システム温度:40℃
溶媒:THF
検量線: 標準ポリスチレン(PL社製)を用いて作成し、重量平均分子量(Mw)はポリスチレン換算値で表した。
・樹脂フィルムA:厚み80μmのアイオノマ樹脂製フィルム、エチレン-メタアクリル酸-アクリル酸2-メチルプロピル共重合体のZn塩を主体。MFR 2.8g/10min(JIS K7210法、210℃)、三井・デュポンポリケミカル株式会社製(市販品)。
・光重合性化合物A:ヘキサメチレンジイソシアネートのイソシアネートにジペタエリスリトールペンタアクリレートを主成分とする水酸基含有アクリレートを反応させたものであり、重量平均分子量が7,500であり、且つ不飽和二重結合官能基数が10であるウレタンアクリレートオリゴマー(合成品)。
・光重合性化合物B:光重合性化合物Aと同様の製法で合成した重量平均分子量4,200、不飽和二重結合官能基数10のウレタンアクリレートオリゴマー(合成品)
・光重合性化合物C:光重合性化合物Aと同様の製法で合成した重量平均分子量2,100、不飽和二重結合官能基数10のウレタンアクリレートオリゴマー(合成品)
・光重合性化合物D:光重合性化合物Aと同様の製法で合成した重量平均分子量10,300、不飽和二重結合官能基数10のウレタンアクリレートオリゴマー(合成品)
・光重合性化合物E:イソホロンジイソシアネートの三量体のイソシアネートにジペタエリスリトールペンタアクリレートを主成分とする水酸基含有アクリレートを反応させたものであり、重量平均分子量が4,900であり、且つ不飽和二重結合官能基数が15であるウレタンアクリレートオリゴマー(合成品)。
なお、光重合製化合物は特開昭61-42529号公報等に記載の公知の方法により調製した。
・硬化剤A:2,4-トリレンジイソシアネートのトリメチロールプロパンアダクト体(市販品)
・硬化剤B:ヘキサメチレンジイソシアネートのトリメチロールプロパンアダクト体(市販品)
・硬化剤C:N,N,N',N'-テトラグリシジル-m-キシリレンジアミン(市販品)
・光重合開始剤A:1-ヒドロキシシクロヘキシルフェニルケトン(市販品)
・光重合開始剤B:ベンジルジメチルケタール(市販品)
JIS Z 0237;2009に準拠して、引張試験機(エー・アンド・デイ社製、RTG-1210)を用い、シリコンウエハの鏡面に貼付して20分経過後におけるダイシングテープの23℃、相対湿度50%での180°引きはがし法による粘着力を測定した。引張速度は300mm/min、ダイシングテープのサイズは250mm×20mmとした。なお、シリコンウエハの鏡面はJIS H 0614により、製造されたものを用いた。
得られたダイシングテープをダミーの回路パターンを形成した直径8インチ×厚み0.15mmのシリコンウエハとリングフレームに貼り合わせた。貼り合わせて20分後に高圧水銀灯で紫外線を150mJ/cm2照射した後、ダイシング、ピックアップの各工程を行った。
ダイシング装置:DISCO社製DAD341
ダイシングブレード:DISCO社製NBC-ZH205O-27HEEE
ダイシングブレード形状:外径55.56mm、刃幅35μm、内径19.05mm
ダイシングブレード回転数:40、000rpm
ダイシングブレード送り速度:100mm/秒
ダイシングサイズ:1.0mm角
ダイシングテープへの切り込み量:30μm
切削水温度:25℃
切削水量:1.0リットル/分
ピックアップ装置:キヤノンマシナリー社製CAP-300II
エキスパンド量:8mm
ニードルピン形状:70μmR
ニードルピン数:1本
ニードルピン突き上げ高さ:0.3mm
チップ保持性は、ダイシング工程後において、半導体チップがダイシングテープに保持されている半導体チップの残存率に基づき、以下の基準により評価した。
◎(優) :チップ飛びが5%未満
○(良) :チップ飛びが5%以上10%未満
×(不可):チップ飛びが10%以上
ピックアップ性は、ピックアップ工程において、半導体チップがピックアップできた率に基づき、以下の基準により評価した。
◎(優):チップのピックアップ成功率が95%以上
○(良):チップのピックアップ成功率が80%以上95%未満
×(不可):チップのピックアップ成功率が80%未満
チッピングは、ピックアップしたチップを無作為に50個選択し、チップの裏面の4辺を500倍の顕微鏡にて観察し、中心方向に最大の欠けの大きさについて以下の基準により評価した。
◎(優) :欠けの大きさが25μm未満
○(良) :欠けの大きさが25μm以上50μm未満
×(不可):欠けの大きさが50μm以上
ダイシングテープをシリコンウエハの鏡面に貼り付けて、20分後に高圧水銀灯で紫外線を150mJ/cm2照射した後、ダイシングテープを剥離した。シリコンウエハの鏡面(貼り付け面)上に残留した0.28μm以上の粒子数をパーティクルカウンターにて測定した。
◎(優) :パーティクルが500個以下
○(良) :パーティクルが501個以上2000個未満。
×(不可):パーティクルが2000個以上。
チップばらけは、ピックアップ工程において、ピックアップしようとした半導体チップの隣接する半導体チップがピン突き上げの衝撃によりばらけてしまった率に基づき、以下の基準により評価した。
◎(優):チップばらけが1%未満
○(良):チップばらけが1%以上3%未満
×(不可):チップばらけが3%以上
表1~表3の実施例・比較例に示すように、特定組成の粘着剤を用いて厚さ3~7μmの粘着剤層を形成した全ての実施例では、総合判定が○又は◎となった。一方、粘着剤の組成又は粘着剤層の厚さが規定外である全ての比較例では、総合判定が×となった。これらの結果により、本発明のダイシングテープを用いれば、チッピング、チップ飛び、及び糊残りを効果的に抑制しつつ、ピックアップ性を良好にすることができることが実証された。
比較例1では、メチル(メタ)アクリレート単位が少なすぎたために、汚染性が悪化した。
比較例2では、メチル(メタ)アクリレート単位が多すぎたために、チップ保持性が悪化し、且つチップばらけが生じやすくなった。
比較例3では、カルボキシル基を有する単量体単位が少なすぎたために、チップ保持性が悪化した。
比較例4では、カルボキシル基を有する単量体単位が多すぎたために、ピックアップ性及び汚染性が悪化した。
比較例5では、ヒドロキシル基を有する単量体単位が少なすぎたために、汚染性が悪化した。
比較例6では、ヒドロキシル基を有する単量体単位が多すぎたために、チップばらけが生じやすくなった。
比較例7では、光重合性化合物が少なすぎたために、チップ保持性及びピックアップ性が悪化した。
比較例8では、光重合性化合物が多すぎたために、汚染性が悪化し、且つチップばらけが生じやすくなった。
比較例9では、光重合性化合物の重量平均分子量が小さすぎたために、チッピングが生じやすくなった。
比較例10では、光重合性化合物の重量平均分子量が大きすぎたために、チップ保持性が悪化した。
比較例11では、硬化剤が少なすぎたために、汚染性が悪化した。
比較例12では、硬化剤が多すぎたために、チップ保持性及び汚染性が悪化し、且つチップばらけが生じやすくなった。
比較例13では、光重合開始剤が少なすぎたために、ピックアップ性が悪化した。
比較例14では、光重合開始剤が多すぎたために、汚染性が悪化し、且つチップばらけが生じやすくなった。
比較例15では、粘着剤層が薄すぎたために、チップ保持性が悪化し、且つチップばらけが生じやすくなった。
比較例16では、粘着剤層が厚すぎたために、チッピングが生じやすくなり、且つピックアップ性が悪化した。
Claims (4)
- 基材フィルムに粘着剤組成物からなる粘着剤層を積層してなるダイシングテープであって、
前記粘着剤組成物が(メタ)アクリル酸エステル共重合体100質量部と、光重合性化合物5~250質量部、硬化剤0.1~20質量部と光重合開始剤0.1~20質量部を含み、
前記(メタ)アクリル酸エステル共重合体が、メチル(メタ)アクリレート単位を35~85質量%、2-エチルへキシル(メタ)アクリレート単位を10~60質量%、カルボキシル基を有する単量体単位を0.5~10質量%、ヒドロキシル基を有する単量体単位を0.05~5質量%含有し、
前記光重合性化合物が重量平均分子量4,000~8,000、且つ不飽和二重結合官能基数が10~15のウレタンアクリレートオリゴマーであり、
前記粘着剤層の厚みが3~7μmであることを特徴とするダイシングテープ。 - 前記硬化剤が多官能イソシアネート硬化剤又は多官能エポキシ硬化剤であることを特徴とする請求項1に記載のダイシングテープ。
- 前記ダイシングテープのJIS Z 0237に準拠して測定したシリコンウエハの鏡面に対する粘着力が5.0N/20mm以上であることを特徴とする請求項1又は請求項2に記載のダイシングテープ。
- (a)半導体ウエハ又は基板とリングフレームとにダイシングテープを貼り付ける貼付工程と、
(b)前記半導体ウエハ又は基板をダイシングして半導体チップ又は半導体部品にするダイシング工程と、
(c)前記ダイシングテープに活性光線を照射する光照射工程と、
(d)前記半導体チップ又は半導体部品同士の間隔を広げるため、前記ダイシングテープを引き伸ばすエキスパンド工程と、
(e)前記ダイシングテープから半導体チップ又は半導体部品をピックアップするピックアップ工程
を含み、
前記ダイシングテープは、請求項1~請求項3の何れか1つに記載のダイシングテープである、電子部品の製造方法。
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CN110437578A (zh) * | 2019-07-19 | 2019-11-12 | 上海悦亮机电科技有限公司 | 一种薄膜和包含薄膜的易撕胶带及其制备方法 |
CN110437578B (zh) * | 2019-07-19 | 2023-01-17 | 上海悦亮机电科技有限公司 | 一种薄膜和包含薄膜的易撕胶带及其制备方法 |
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Also Published As
Publication number | Publication date |
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TWI678409B (zh) | 2019-12-01 |
JPWO2016111283A1 (ja) | 2017-10-19 |
JP6604972B2 (ja) | 2019-11-13 |
KR102474023B1 (ko) | 2022-12-02 |
CN107112221B (zh) | 2020-12-22 |
TW201636408A (zh) | 2016-10-16 |
CN107112221A (zh) | 2017-08-29 |
KR20170106982A (ko) | 2017-09-22 |
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