WO2018181766A1 - Procédé de production de dispositif à semi-conducteur et feuille adhésive double face - Google Patents
Procédé de production de dispositif à semi-conducteur et feuille adhésive double face Download PDFInfo
- Publication number
- WO2018181766A1 WO2018181766A1 PCT/JP2018/013353 JP2018013353W WO2018181766A1 WO 2018181766 A1 WO2018181766 A1 WO 2018181766A1 JP 2018013353 W JP2018013353 W JP 2018013353W WO 2018181766 A1 WO2018181766 A1 WO 2018181766A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- adhesive layer
- semiconductor chip
- double
- Prior art date
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Images
Classifications
-
- 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
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/89—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using at least one connector not provided for in any of the groups H01L24/81 - H01L24/86
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
- H01L21/568—Temporary substrate used as encapsulation process aid
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/16—Fillings or auxiliary members in containers or encapsulations, e.g. centering rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3157—Partial encapsulation or coating
-
- 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
- H01L24/18—High density interconnect [HDI] connectors; Manufacturing methods related thereto
- H01L24/19—Manufacturing methods of high density interconnect preforms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—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
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/04105—Bonding areas formed on an encapsulation of the semiconductor or solid-state body, e.g. bonding areas on chip-scale packages
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—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
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/12—Structure, shape, material or disposition of the bump connectors prior to the connecting process
- H01L2224/12105—Bump connectors formed on an encapsulation of the semiconductor or solid-state body, e.g. bumps on chip-scale packages
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/93—Batch processes
- H01L2224/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L2224/96—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being encapsulated in a common layer, e.g. neo-wafer or pseudo-wafer, said common layer being separable into individual assemblies after connecting
Definitions
- the present invention relates to a semiconductor device manufacturing method and a double-sided pressure-sensitive adhesive sheet.
- CSP Chip Scale Package
- WLP Wafer Level Package
- PLP Pulel Level Package
- WLP and PLP are classified into fan-in type and fan-out type.
- fan-out type WLP hereinafter also referred to as “FOWLP”
- PLP hereinafter also referred to as “FOPPL”
- a semiconductor chip is covered with a sealing material so as to be an area larger than the chip size.
- the rewiring layer and the external electrode are formed not only on the circuit surface of the semiconductor chip but also on the surface region of the sealing material.
- FOWLP and FOPLP are, for example, a mounting step of mounting a plurality of semiconductor chips on an adhesive sheet for temporary fixing (hereinafter also referred to as “temporary fixing sheet”), and a sealing material imparted with fluidity.
- Temporary fixing sheet an adhesive sheet for temporary fixing
- the temporary fixing sheet used in the above-described process does not cause misalignment of the semiconductor chip between the covering process and the curing process (hereinafter also referred to as “sealing process”), and the semiconductor chip Adhesiveness that does not allow the sealing material to enter the adhesive interface between the sheet and the temporary fixing sheet is required, and after the sealing process, peelability that can be easily removed without adhesive residue is required. That is, the temporary fixing sheet used for the manufacture of FOWLP and FOPLP is required to satisfy both the adhesiveness during use and the peelability after use.
- Patent Document 1 in the method for producing FOWLP, a sealing step is performed on a temporary fixing sheet having a base material made of a polyimide film and an adhesive layer made of a silicone-based adhesive provided on the surface of the base material.
- a method of peeling while temporarily bending the temporary fixing sheet is disclosed.
- the process of peeling the temporarily fixing sheet by hand or the like is complicated, and it is required that the temporarily fixing sheet can be peeled with a smaller external force from the viewpoint of improving productivity.
- Patent Document 2 discloses a temporary fixing at the time of cutting an electronic component in which a thermally expandable adhesive layer containing thermally expandable microspheres is provided on at least one side of a substrate.
- a heat-peelable pressure-sensitive adhesive sheet is disclosed.
- FOWLP and FOPLP it is also conceivable to use the heat-peelable pressure-sensitive adhesive sheet described in Patent Document 2.
- JP2015-32646A Japanese Patent No. 3594853
- the present invention has been made in view of the above-described problems, and can suppress the occurrence of misalignment of a semiconductor chip in a manufacturing process of a fan-out type package, has excellent productivity, and is a rewiring layer of a semiconductor device to be obtained. It aims at providing the manufacturing method of the semiconductor device which is excellent in the flatness of a formation surface, and the double-sided adhesive sheet used for this manufacturing method.
- the present inventors have solved the above problem by using a double-sided pressure-sensitive adhesive sheet having a specific layer structure including a base material that includes expandable particles and is non-adhesive in the manufacturing process of a fan-out type package. Found to get. That is, the present invention relates to the following [1] to [10].
- [1] A method of manufacturing a semiconductor device using a double-sided pressure-sensitive adhesive sheet having a first pressure-sensitive adhesive layer, a non-adhesive base material containing expandable particles, and a second pressure-sensitive adhesive layer in this order.
- a method for manufacturing a semiconductor device comprising the following steps (1) to (4).
- Step (1) Step of attaching a hard support to the adhesive surface of the second pressure-sensitive adhesive layer
- Step (2) Step of placing a semiconductor chip on a part of the pressure-sensitive adhesive surface of the first pressure-sensitive adhesive layer
- Step (3) The semiconductor chip and the periphery of the semiconductor chip of the adhesive surface of the first pressure-sensitive adhesive layer are covered with a sealing material, the sealing material is cured, and the semiconductor chip is cured and sealed.
- Step (5) Step of forming a rewiring layer on the cured encapsulant from which the double-sided pressure-sensitive adhesive sheet has been peeled
- the expandable particles are thermally expandable particles
- the step (4) is the double-sided step.
- Method. [4] The method for manufacturing a semiconductor device according to the above [3], wherein the expansion start temperature (t) of the thermally expandable particles is 120 to 250 ° C.
- the storage shear modulus G ′ (23) of the first pressure-sensitive adhesive layer at 23 ° C. is 1.0 ⁇ 10 4 to 1.0 ⁇ 10 8 Pa.
- the manufacturing method of the semiconductor device in any one. [8] The above [1] to [7], wherein the ratio of the thickness of the base material to the thickness of the first pressure-sensitive adhesive layer (base material / first pressure-sensitive adhesive layer) at 23 ° C. is 0.2 or more. A method for manufacturing a semiconductor device according to any one of the above. [9] The material according to any one of [1] to [8], wherein the base material has a thickness of 10 to 1000 ⁇ m and the first pressure-sensitive adhesive layer has a thickness of 1 to 60 ⁇ m at 23 ° C.
- a method for manufacturing a semiconductor device [10] The method for manufacturing a semiconductor device according to any one of [1] to [9], wherein a probe tack value on the surface of the base material is less than 50 mN / 5 mm ⁇ . [11] A double-sided pressure-sensitive adhesive sheet used in the method for manufacturing a semiconductor device according to any one of [1] to [10], comprising a first pressure-sensitive adhesive layer and expandable particles, and being non-tacky The double-sided adhesive sheet which has a base material and a 2nd adhesive layer in this order.
- a semiconductor device manufacturing method that can suppress the occurrence of positional deviation of a semiconductor chip in a manufacturing process of a fan-out type package, is excellent in productivity, and is excellent in flatness of a rewiring layer forming surface of the obtained semiconductor device.
- the double-sided adhesive sheet used for this manufacturing method can be provided.
- FIG. 3 is a cross-sectional view illustrating an example of the manufacturing method according to the present embodiment following FIG. 2.
- FIG. 4 is a cross-sectional view illustrating an example of the manufacturing method according to the present embodiment following FIG. 3.
- the “active ingredient” refers to a component excluding a diluent solvent among components contained in a target composition.
- the mass average molecular weight (Mw) is a value in terms of standard polystyrene measured by a gel permeation chromatography (GPC) method, specifically a value measured based on the method described in the examples.
- (meth) acrylic acid indicates both “acrylic acid” and “methacrylic acid”, and the same applies to other similar terms.
- the lower limit value and upper limit value which were described in steps can be combined independently, respectively. For example, from the description “preferably 10 to 90, more preferably 30 to 60”, “preferable lower limit (10)” and “more preferable upper limit (60)” are combined to obtain “10 to 60”. You can also.
- the method for manufacturing a semiconductor device uses a double-sided pressure-sensitive adhesive sheet having a first pressure-sensitive adhesive layer, a non-adhesive base material containing expandable particles, and a second pressure-sensitive adhesive layer in this order.
- a method of manufacturing a semiconductor device comprising the following steps (1) to (4).
- Step (1) Step of attaching a hard support to the adhesive surface of the second pressure-sensitive adhesive layer
- Step (2) Step of placing a semiconductor chip on a part of the pressure-sensitive adhesive surface of the first pressure-sensitive adhesive layer
- Step (3) The semiconductor chip and the periphery of the semiconductor chip of the adhesive surface of the first pressure-sensitive adhesive layer are covered with a sealing material, the sealing material is cured, and the semiconductor chip is cured and sealed.
- Step (4) Inflating the expandable particles and peeling the double-sided PSA sheet from the cured encapsulant
- the double-sided pressure-sensitive adhesive sheet used in the method for manufacturing a semiconductor device will be described, and then each manufacturing process including steps (1) to (4) will be described.
- the double-sided pressure-sensitive adhesive sheet according to the present embodiment includes a first pressure-sensitive adhesive layer, a non-adhesive base material containing expandable particles (hereinafter also referred to as “expandable base material”), a second pressure-sensitive adhesive layer, are not particularly limited as long as they have the above in this order.
- the shape of the double-sided pressure-sensitive adhesive sheet can take any shape such as a sheet shape, a tape shape, and a label shape.
- FIG. 1A is a cross-sectional view of a double-sided pressure-sensitive adhesive sheet 10 according to this embodiment.
- the double-sided pressure-sensitive adhesive sheet 10 according to this embodiment has a configuration in which the base material 11 is sandwiched between a first pressure-sensitive adhesive layer 121 and a second pressure-sensitive adhesive layer 122.
- the double-sided pressure-sensitive adhesive sheet according to the present embodiment further includes a release material 131 on the pressure-sensitive adhesive surface 121a of the first pressure-sensitive adhesive layer 121, as in the double-sided pressure-sensitive adhesive sheet 10a shown in FIG.
- a release material 132 may be further provided on the adhesive surface 122 a of the agent layer 122.
- the peeling force from the first pressure-sensitive adhesive layer 121 of the release material 131 and the peeling force from the second pressure-sensitive adhesive layer 122 of the release material 132 are approximately the same.
- a phenomenon occurs in which the first pressure-sensitive adhesive layer 121 and the second pressure-sensitive adhesive layer 122 are divided and peeled off along with the two release materials.
- the release materials 131 and 132 are appropriately removed when the double-sided pressure-sensitive adhesive sheet 10a is used in the method for manufacturing a semiconductor device according to this embodiment.
- the double-sided pressure-sensitive adhesive sheet in the double-sided pressure-sensitive adhesive sheet 10a shown in FIG. 1 (B), one side of the first pressure-sensitive adhesive layer 121 or the second pressure-sensitive adhesive layer 122 is peeled on both sides.
- a double-sided pressure-sensitive adhesive sheet having a configuration in which materials are laminated in a roll shape may be used.
- the double-sided pressure-sensitive adhesive sheet according to this embodiment has other layers between the expandable base material and the first pressure-sensitive adhesive layer and between the expandable base material and the second pressure-sensitive adhesive layer. There may be.
- the double-sided pressure-sensitive adhesive sheet shown in FIGS. 11 and the second pressure-sensitive adhesive layer 122 preferably have a directly laminated structure.
- the expandable substrate, the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer, and the release material used as necessary, which are provided in the double-sided pressure-sensitive adhesive sheet according to the present embodiment, will be described in order.
- An expandable substrate is a substrate that includes expandable particles and is non-tacky.
- the heat-expandable pressure-sensitive adhesive layer as the pressure-sensitive adhesive sheet described in Patent Document 2 contains a pressure-sensitive adhesive having a low elastic modulus and sufficiently contains expandable particles. Thickness is required. For this reason, the semiconductor chip is displaced between the mounting process and the sealing process of the semiconductor chip, or the semiconductor chip sinks to the adhesive sheet side, resulting in a problem that the rewiring layer forming surface cannot be flattened. obtain.
- the double-sided pressure-sensitive adhesive sheet according to this embodiment includes the expandable particles in the non-adhesive resin having a high elastic modulus, the adjustment of the thickness of the first pressure-sensitive adhesive layer on which the semiconductor chip is placed, the adhesive strength, The degree of freedom in design, such as control of viscoelasticity, is improved. This can suppress the occurrence of misalignment of the semiconductor chip, suppress the semiconductor chip from sinking into the double-sided pressure-sensitive adhesive sheet, and form a rewiring layer forming surface with excellent flatness.
- the semiconductor chip is placed on the pressure-sensitive adhesive surface of the first pressure-sensitive adhesive layer, so that the expandable base material and the rewiring layer forming surface may be in direct contact with each other. Absent. As a result, the residue derived from the expandable particles and a part of the greatly deformed adhesive layer adhere to the rewiring layer forming surface, or the uneven shape formed on the thermally expandable adhesive layer is transferred to the rewiring layer forming surface. As a result, the reduction in smoothness is suppressed, and a rewiring layer forming surface excellent in cleanliness and smoothness is obtained.
- the thickness of the expandable substrate is preferably 10 to 1000 ⁇ m, more preferably 20 to 500 ⁇ m, still more preferably 25 to 400 ⁇ m, and still more preferably 30 to 300 ⁇ m.
- the thickness of an expansible base material means the value measured by the method as described in an Example.
- the expandable base material which an adhesive sheet has is a non-adhesive base material.
- whether or not the non-adhesive substrate is determined if the probe tack value measured in accordance with JIS Z0237: 1991 is less than 50 mN / 5 mm ⁇ with respect to the surface of the target substrate.
- the said base material is judged as a "non-adhesive base material".
- the probe tack value on the surface of the expandable substrate used in the present embodiment is usually less than 50 mN / 5 mm ⁇ , preferably less than 30 mN / 5 mm ⁇ , more preferably less than 10 mN / 5 mm ⁇ , and even more preferably 5 mN / It is less than 5 mm ⁇ .
- the specific measuring method of the probe tack value on the surface of an expansible base material is based on the method as described in an Example.
- the expansible base material which the adhesive sheet of this embodiment has contains resin and expansive particles, but may contain the additive for base materials in the range which does not impair the effect of this invention as needed.
- an expansible base material can be formed from the resin composition (y) containing resin and expansive particle.
- each component contained in the resin composition (y) which is a forming material of an expansible base material is demonstrated.
- the resin contained in the resin composition (y) is not particularly limited as long as the expandable substrate is a non-adhesive resin, and may be a non-adhesive resin or an adhesive resin. . That is, even if the resin contained in the resin composition (y) is an adhesive resin, the adhesive resin undergoes a polymerization reaction with the polymerizable compound in the process of forming the expandable substrate from the resin composition (y). The obtained resin becomes a non-adhesive resin, and the expandable substrate containing the resin only needs to be non-adhesive.
- the mass average molecular weight (Mw) of the resin contained in the resin composition (y) is preferably 1,000 to 1,000,000, more preferably 1,000 to 700,000, and still more preferably 1,000 to 500,000. Further, when the resin is a copolymer having two or more kinds of structural units, the form of the copolymer is not particularly limited, and any of a block copolymer, a random copolymer, and a graft copolymer It may be.
- the content of the resin is preferably 50 to 99% by mass, more preferably 60 to 95% by mass, and still more preferably 65 to 90% with respect to the total amount (100% by mass) of the active ingredients of the resin composition (y). It is 70% by weight, more preferably 70 to 85% by weight.
- the resin contained in the resin composition (y) preferably contains at least one selected from acrylic urethane resins and olefin resins. Moreover, as said acrylic urethane type resin, the following resin (U1) is preferable.
- urethane prepolymer (UP) serving as the main chain of the acrylic urethane resin (U1) include a reaction product of a polyol and a polyvalent isocyanate.
- the urethane prepolymer (UP) is preferably obtained by further performing a chain extension reaction using a chain extender.
- Examples of the polyol used as a raw material for the urethane prepolymer (UP) include alkylene type polyols, ether type polyols, ester type polyols, ester amide type polyols, ester / ether type polyols, and carbonate type polyols. These polyols may be used independently and may use 2 or more types together.
- the polyol used in this embodiment is preferably a diol, more preferably an ester diol, an alkylene diol, and a carbonate diol, and even more preferably an ester diol and a carbonate diol.
- ester type diols include alkane diols such as 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol; ethylene glycol, propylene glycol, One or more selected from diols such as alkylene glycols such as diethylene glycol and dipropylene glycol; phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, 4,4-diphenyldicarboxylic acid, diphenylmethane-4 , 4'-dicarboxylic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, het acid, maleic acid, fumaric acid, itaconic acid, cyclohexane-1,3-dicarboxylic acid, cyclohexane-1,4-dicarbox
- alkylene type diol examples include alkane diols such as 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol; ethylene glycol, propylene glycol, And alkylene glycols such as diethylene glycol and dipropylene glycol; polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polybutylene glycol; polyoxyalkylene glycols such as polytetramethylene glycol; and the like.
- alkane diols such as 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol
- ethylene glycol, propylene glycol And alkylene glycols such as diethylene glycol and dipropylene glycol
- Examples of the carbonate type diol include 1,4-tetramethylene carbonate diol, 1,5-pentamethylene carbonate diol, 1,6-hexamethylene carbonate diol, 1,2-propylene carbonate diol, and 1,3-propylene carbonate diol. 2,2-dimethylpropylene carbonate diol, 1,7-heptamethylene carbonate diol, 1,8-octamethylene carbonate diol, 1,4-cyclohexane carbonate diol, and the like.
- polyvalent isocyanate used as a raw material for the urethane prepolymer (UP) examples include aromatic polyisocyanates, aliphatic polyisocyanates, and alicyclic polyisocyanates. These polyvalent isocyanates may be used alone or in combination of two or more. These polyisocyanates may be a trimethylolpropane adduct type modified product, a burette type modified product reacted with water, or an isocyanurate type modified product containing an isocyanurate ring.
- diisocyanate is preferable, and 4,4′-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate (2,4-TDI), 2,6-triisocyanate.
- MDI 4,4′-diphenylmethane diisocyanate
- 2,4-TDI 2,4-tolylene diisocyanate
- 2,6-triisocyanate One or more selected from diisocyanate (2,6-TDI), hexamethylene diisocyanate (HMDI), and alicyclic diisocyanate are more preferable.
- alicyclic diisocyanate examples include 3-isocyanate methyl-3,5,5-trimethylcyclohexyl isocyanate (isophorone diisocyanate, IPDI), 1,3-cyclopentane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane.
- IPDI isophorone diisocyanate
- Examples include diisocyanate, methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, and isophorone diisocyanate (IPDI) is preferred.
- the urethane prepolymer (UP) serving as the main chain of the acrylic urethane resin (U1) is a reaction product of a diol and a diisocyanate, and is a linear urethane prepolymer having ethylenically unsaturated groups at both ends.
- Polymers are preferred.
- hydroxyalkyl (meth) acrylate examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-hydroxy Examples thereof include butyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate.
- the (meth) acrylic acid ester is preferably one or more selected from alkyl (meth) acrylates and hydroxyalkyl (meth) acrylates, and more preferably used in combination with alkyl (meth) acrylates and hydroxyalkyl (meth) acrylates.
- the proportion of hydroxyalkyl (meth) acrylate to 100 parts by mass of alkyl (meth) acrylate is preferably 0.1 to 100 parts by mass, The amount is preferably 0.5 to 30 parts by mass, more preferably 1.0 to 20 parts by mass, and still more preferably 1.5 to 10 parts by mass.
- the number of carbon atoms in the alkyl group of the alkyl (meth) acrylate is preferably 1 to 24, more preferably 1 to 12, still more preferably 1 to 8, and still more preferably 1 to 3.
- hydroxyalkyl (meth) acrylate the same thing as the hydroxyalkyl (meth) acrylate used in order to introduce
- vinyl compounds other than (meth) acrylic acid esters include aromatic hydrocarbon vinyl compounds such as styrene, ⁇ -methylstyrene, and vinyl toluene; vinyl ethers such as methyl vinyl ether and ethyl vinyl ether; vinyl acetate and vinyl propionate.
- Polar group-containing monomers such as (meth) acrylonitrile, N-vinylpyrrolidone, (meth) acrylic acid, maleic acid, fumaric acid, itaconic acid, and meta (acrylamide). These may be used alone or in combination of two or more.
- the content of the (meth) acrylic acid ester in the vinyl compound is preferably 40 to 100% by mass, more preferably 65 to 100% by mass, and still more preferably based on the total amount (100% by mass) of the vinyl compound. It is 80 to 100% by mass, more preferably 90 to 100% by mass.
- the total content of alkyl (meth) acrylate and hydroxyalkyl (meth) acrylate in the vinyl compound is preferably 40 to 100% by mass, more preferably 65 to 100% by mass with respect to the total amount (100% by mass) of the vinyl compound.
- the amount is 100% by mass, more preferably 80 to 100% by mass, and still more preferably 90 to 100% by mass.
- the acrylic urethane-based resin (U1) used in the present embodiment is obtained by mixing a urethane prepolymer (UP) and a vinyl compound containing a (meth) acrylic acid ester and polymerizing them.
- the polymerization is preferably performed by adding a radical initiator.
- the content ratio of the structural unit (u11) derived from the urethane prepolymer (UP) and the structural unit (u12) derived from the vinyl compound [(u11) / (U12)] is preferably 10/90 to 80/20, more preferably 20/80 to 70/30, still more preferably 30/70 to 60/40, and still more preferably 35/65 by mass ratio. ⁇ 55/45.
- the olefin resin suitable as the resin contained in the resin composition (y) is a polymer having at least a structural unit derived from an olefin monomer.
- the olefin monomer is preferably an ⁇ -olefin having 2 to 8 carbon atoms, and specifically includes ethylene, propylene, butylene, isobutylene, 1-hexene and the like. Among these, ethylene and propylene are preferable.
- olefinic resins for example, ultra low density polyethylene (VLDPE, density: 880 kg / m 3 or more 910 kg / m less than 3), low density polyethylene (LDPE, density: 910 kg / m 3 or more 915 kg / m less than 3 ), Medium density polyethylene (MDPE, density: 915 kg / m 3 or more and less than 942 kg / m 3 ), high density polyethylene (HDPE, density: 942 kg / m 3 or more), linear low density polyethylene, etc .; polypropylene resin (PP); polybutene resin (PB); ethylene-propylene copolymer; olefin elastomer (TPO); poly (4-methyl-1-pentene) (PMP); ethylene-vinyl acetate copolymer (EVA); ethylene -Vinyl alcohol copolymer (EVOH); ethylene-propylene Olefinic terpolymers such as-(5-ethylid)
- the olefin-based resin may be a modified olefin-based resin that is further modified by one or more selected from acid modification, hydroxyl group modification, and acrylic modification.
- an acid-modified olefin resin obtained by subjecting an olefin resin to acid modification a modified polymer obtained by graft polymerization of the above-mentioned unmodified olefin resin with an unsaturated carboxylic acid or its anhydride.
- unsaturated carboxylic acid or anhydride thereof include maleic acid, fumaric acid, itaconic acid, citraconic acid, glutaconic acid, tetrahydrophthalic acid, aconitic acid, (meth) acrylic acid, maleic anhydride, itaconic anhydride.
- Glutaconic anhydride citraconic anhydride, aconitic anhydride, norbornene dicarboxylic anhydride, tetrahydrophthalic anhydride, and the like.
- unsaturated carboxylic acid or its anhydride may be used independently, and may use 2 or more types together.
- an acrylic modified olefin resin obtained by subjecting an olefin resin to acrylic modification a modification obtained by graft polymerization of an alkyl (meth) acrylate as a side chain to the above-mentioned unmodified olefin resin as a main chain.
- a polymer is mentioned.
- the number of carbon atoms in the alkyl group of the alkyl (meth) acrylate is preferably 1-20, more preferably 1-16, and still more preferably 1-12.
- said alkyl (meth) acrylate the same thing as the compound which can be selected as a below-mentioned monomer (a1 ') is mentioned, for example.
- Examples of the hydroxyl group-modified olefin resin obtained by subjecting an olefin resin to hydroxyl group modification include a modified polymer obtained by graft-polymerizing a hydroxyl group-containing compound to the above-mentioned unmodified olefin resin as the main chain.
- Examples of the hydroxyl group-containing compound include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-hydroxybutyl.
- Examples thereof include hydroxyalkyl (meth) acrylates such as (meth) acrylate and 4-hydroxybutyl (meth) acrylate; unsaturated alcohols such as vinyl alcohol and allyl alcohol.
- the resin composition (y) may contain a resin other than the acrylic urethane resin and the olefin resin as long as the effects of the present invention are not impaired.
- Such resins include vinyl resins such as polyvinyl chloride, polyvinylidene chloride, and polyvinyl alcohol; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polystyrene; acrylonitrile-butadiene-styrene copolymer Polycarbonate; Polyurethane not applicable to acrylic urethane resin; Polysulfone; Polyetheretherketone; Polyethersulfone; Polyphenylene sulfide; Polyimide resin such as polyetherimide and polyimide; Polyamide resin; Acrylic resin; Fluorine resin etc. are mentioned.
- vinyl resins such as polyvinyl chloride, polyvinylidene chloride, and polyvinyl alcohol
- polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate
- polystyrene acrylonitrile-butadiene-styren
- the content of the resin other than the acrylic urethane-based resin and the olefin-based resin is preferably less than 30 parts by mass, more preferably 20 parts by mass with respect to 100 parts by mass of the total amount of the resin contained in the resin composition (y). Less than, more preferably less than 10 parts by mass, still more preferably less than 5 parts by mass, and even more preferably less than 1 part by mass.
- the expandable particles are not particularly limited as long as they can expand by an external stimulus to form irregularities in the first pressure-sensitive adhesive layer and can reduce the adhesive force with the adherend.
- Examples of the expandable particles include thermally expandable particles that expand by heating, energy beam expandable particles that expand by irradiation with energy rays, and the like, from the viewpoint of versatility and handleability, they are thermally expandable particles. It is preferable.
- the thermally expandable particles are preferably particles having an expansion start temperature (t) adjusted to 120 to 250 ° C.
- the expansion start temperature (t) of the thermally expandable particles means a value measured based on the following method.
- Measurement method of expansion start temperature (t) of thermally expandable particles To an aluminum cup having a diameter of 6.0 mm (inner diameter 5.65 mm) and a depth of 4.8 mm, 0.5 mg of thermally expandable particles to be measured is added, and an aluminum lid (diameter 5.6 mm, thickness 0. 1 mm) is prepared.
- the height of the sample is measured from the upper part of the aluminum lid while a force of 0.01 N is applied to the sample by a pressurizer. Then, in a state where a force of 0.01 N is applied by the pressurizer, heating is performed from 20 ° C. to 300 ° C. at a rate of temperature increase of 10 ° C./min, and the amount of displacement of the pressurizer in the vertical direction is measured.
- the displacement start temperature be the expansion start temperature (t).
- the thermally expandable particles are microencapsulated foaming agents composed of an outer shell composed of a thermoplastic resin and an encapsulated component encapsulated in the outer shell and vaporized when heated to a predetermined temperature.
- a thermoplastic resin constituting the outer shell of the microencapsulated foaming agent include vinylidene chloride-acrylonitrile copolymer, polyvinyl alcohol, polyvinyl butyral, polymethyl methacrylate, polyacrylonitrile, polyvinylidene chloride, and polysulfone.
- Examples of the inclusion component contained in the outer shell include propane, butane, pentane, hexane, heptane, octane, nonane, decane, isobutane, isopentane, isohexane, isoheptane, isooctane, isononane, isodecane, cyclopropane, cyclobutane, cyclopentane.
- the volume expansion coefficient when heated to a temperature not lower than the thermal expansion start temperature (t) of the thermally expandable particles used in the present embodiment is preferably 1.5 to 100 times, more preferably 2 to 80 times, still more preferably. Is 2.5 to 60 times, more preferably 3 to 40 times.
- the average particle diameter of the expandable particles before expansion at 23 ° C. used in this embodiment is preferably 3 to 100 ⁇ m, more preferably 4 to 70 ⁇ m, still more preferably 6 to 60 ⁇ m, and still more preferably 10 to 50 ⁇ m. .
- the average particle diameter of the expandable particles before expansion is the volume-median particle diameter (D 50 ), and a laser diffraction particle size distribution measuring device (for example, product name “Mastersizer 3000” manufactured by Malvern) is used.
- D 50 volume-median particle diameter
- a laser diffraction particle size distribution measuring device for example, product name “Mastersizer 3000” manufactured by Malvern
- the particle distribution of the expandable particles before expansion measured by use it means the particle diameter corresponding to 50% of the cumulative volume frequency calculated from the smaller particle diameter of the expandable particles before expansion.
- the 90% particle diameter (D 90 ) of the expandable particles before expansion at 23 ° C. used in this embodiment is preferably 10 to 150 ⁇ m, more preferably 20 to 100 ⁇ m, still more preferably 25 to 90 ⁇ m, and still more preferably. Is 30 to 80 ⁇ m.
- the 90% particle diameter (D 90 ) before expansion of the expandable particles is measured using a laser diffraction particle size distribution measuring apparatus (for example, product name “Mastersizer 3000” manufactured by Malvern), before expansion. Mean particle diameter corresponding to 90% of the cumulative volume frequency calculated from the smaller particle diameter of the expandable particles before expansion.
- the content of the expandable particles is preferably 1 to 40% by mass, more preferably 5 to 35% by mass, and further preferably 10 to 10% by mass with respect to the total amount (100% by mass) of the active ingredients of the resin composition (y). 30% by mass, and still more preferably 15 to 25% by mass.
- the resin composition (y) used in the present embodiment may contain a base material additive contained in a base material of a general pressure-sensitive adhesive sheet as long as the effects of the present invention are not impaired.
- base material additives include ultraviolet absorbers, light stabilizers, antioxidants, antistatic agents, slip agents, antiblocking agents, and colorants. These base material additives may be used alone or in combination of two or more.
- the content of each base material additive is preferably 0.0001 to 20 parts by mass with respect to 100 parts by mass of the resin in the resin composition (y). More preferably, it is 0.001 to 10 parts by mass.
- ⁇ Solvent-free resin composition (y1)> As one aspect of the resin composition (y) used in the present embodiment, an oligomer having an ethylenically unsaturated group having a mass average molecular weight (Mw) of 50000 or less, an energy ray polymerizable monomer, and the above-mentioned expandable particles are blended And a solvent-free resin composition (y1) that does not contain a solvent. In the solventless resin composition (y1), no solvent is blended, but the energy beam polymerizable monomer contributes to the improvement of the plasticity of the oligomer. An expandable base material can be obtained by irradiating an energy ray with respect to the coating film formed from the solventless resin composition (y1).
- the type, shape, and blending amount (content) of the expandable particles blended in the solventless resin composition (y1) are as described above.
- the mass average molecular weight (Mw) of the oligomer contained in the solventless resin composition (y1) is 50000 or less, preferably 1000 to 50000, more preferably 2000 to 40000, and still more preferably 3000 to 35000. More preferably, it is 4000-30000.
- oligomer As said oligomer, what is necessary is just to have an ethylenically unsaturated group whose mass mean molecular weight (Mw) is 50000 or less among resin contained in the above-mentioned resin composition (y). Polymer (UP) is preferred.
- the modified olefin resin etc. which have an ethylenically unsaturated group can also be used.
- the total content of the oligomer and the energy beam polymerizable monomer in the solventless resin composition (y1) is preferably 50 with respect to the total amount (100% by mass) of the solventless resin composition (y1). It is ⁇ 99% by mass, more preferably 60 to 95% by mass, still more preferably 65 to 90% by mass, and still more preferably 70 to 85% by mass.
- Examples of the energy ray polymerizable monomer include isobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyloxy (meth) acrylate, cyclohexyl (meth) acrylate, adamantane ( Cycloaliphatic polymerizable compounds such as (meth) acrylate and tricyclodecane acrylate; Aromatic polymerizable compounds such as phenylhydroxypropyl acrylate, benzyl acrylate and phenol ethylene oxide modified acrylate; Tetrahydrofurfuryl (meth) acrylate, morpholine acrylate, N- And heterocyclic polymerizable compounds such as vinylpyrrolidone and N-vinylcaprolactam. These energy beam polymerizable monomers may be used independently and may use 2 or more types together.
- the content ratio of the oligomer to the energy beam polymerizable monomer is preferably 20/80 to 90 / in mass ratio. 10, more preferably 30/70 to 85/15, still more preferably 35/65 to 80/20.
- the solventless resin composition (y1) is preferably further blended with a photopolymerization initiator.
- a photopolymerization initiator By containing the photopolymerization initiator, the curing reaction can be sufficiently advanced even by irradiation with a relatively low energy beam.
- photopolymerization initiator examples include 1-hydroxy-cyclohexyl-phenyl-ketone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzyl phenyl sulfide, tetramethylthiuram monosulfide, azobisisobutyrol. Nitrile, dibenzyl, diacetyl, 8-chloroanthraquinone and the like can be mentioned. These photoinitiators may be used independently and may use 2 or more types together.
- the blending amount of the photopolymerization initiator is preferably 0.01 to 5 parts by mass, more preferably 0.01 to 4 parts by mass with respect to the total amount (100 parts by mass) of the oligomer and the energy ray polymerizable monomer.
- the amount is preferably 0.02 to 3 parts by mass.
- the storage elastic modulus E ′ (23) at 23 ° C. of the expandable substrate of the pressure-sensitive adhesive sheet of this embodiment is preferably 1.0 ⁇ 10 6 Pa or more, more preferably 5.0 ⁇ 10 6 to 5.0. ⁇ 10 12 Pa, more preferably 1.0 ⁇ 10 7 to 1.0 ⁇ 10 12 Pa, still more preferably 5.0 ⁇ 10 7 to 1.0 ⁇ 10 11 Pa, still more preferably 1.0 ⁇ 10 8 to 1.0 ⁇ 10 10 Pa.
- the semiconductor chip is placed so that its circuit surface is covered with the adhesive surface of the adhesive layer.
- a known device such as a flip chip bonder or a die bonder may be used.
- a force is applied to push the semiconductor chip in the thickness direction of the adhesive sheet.
- the storage elastic modulus E ′ of the expandable substrate at a predetermined temperature means a value measured by the method described in Examples.
- the storage elastic modulus satisfy
- the storage elastic modulus E '(100) of the said expandable base material in 100 degreeC is 2.0 * 10 ⁇ 5 > Pa or more.
- the storage elastic modulus E ′ (100) of the expandable substrate is more preferably 4.0 ⁇ 10 5 Pa or more, still more preferably 6.0 ⁇ 10 5 Pa or more, and still more preferably 8.0. ⁇ 10 5 Pa or more, still more preferably 1.0 ⁇ 10 6 Pa or more.
- the storage elastic modulus E ′ (100) of the expandable substrate is preferably 1.0 ⁇ 10 12 Pa or less, more preferably It is 1.0 ⁇ 10 11 Pa or less, more preferably 1.0 ⁇ 10 10 Pa or less, and still more preferably 1.0 ⁇ 10 9 Pa or less.
- the expansible base material which the adhesive sheet of this embodiment has contains a thermally expansible particle as an expansible particle it is preferable that the storage elastic modulus satisfy
- the storage elastic modulus E ′ (t) of the expandable substrate at the expansion start temperature (t) of the thermally expandable particles is 1.0 ⁇ 10 7 Pa or less.
- the storage elastic modulus E ′ (t) of the expandable substrate is more preferably 9.0 ⁇ 10 6 Pa or less, still more preferably 8.0 ⁇ 10 6 Pa or less, and still more preferably 6.0. ⁇ 10 6 Pa or less, still more preferably 4.0 ⁇ 10 6 Pa or less. Further, from the viewpoint of suppressing the flow of the expanded thermally expandable particles, improving the shape maintaining property of the unevenness formed on the adhesive surface of the first pressure-sensitive adhesive layer, and further improving the peelability, storing the expandable base material
- the elastic modulus E ′ (t) is preferably 1.0 ⁇ 10 3 Pa or more, more preferably 1.0 ⁇ 10 4 Pa or more, and further preferably 1.0 ⁇ 10 5 Pa or more.
- the 1st adhesive layer which the adhesive sheet of this embodiment has should just contain adhesive resin, and it is for adhesives, such as a crosslinking agent, a tackifier, a polymeric compound, and a polymerization initiator as needed. An additive may be contained.
- a 1st adhesive layer is a non-expandable adhesive layer from a viewpoint which prevents the semiconductor chip mounted from sinking in a 1st adhesive layer by the heating in a sealing process.
- the pressure-sensitive adhesive force of the pressure-sensitive adhesive surface of the first pressure-sensitive adhesive layer before expansion of the expandable particles at 23 ° C. is preferably 0.1 to 10.0 N / 25 mm, more preferably 0. It is 2 to 8.0 N / 25 mm, more preferably 0.4 to 6.0 N / 25 mm, and still more preferably 0.5 to 4.0 N / 25 mm. If the adhesive force is 0.1 N / 25 mm or more, it can be sufficiently fixed to such an extent that the semiconductor chip can be prevented from being displaced in the sealing step. On the other hand, when the adhesive strength is 10.0 N / 25 mm or less, it can be easily peeled off with a slight external force when peeling off from the adherend. In addition, said adhesive force means the value measured by the method as described in an Example.
- the storage shear modulus G ′ (23) of the first pressure-sensitive adhesive layer at 23 ° C. is preferably 1.0 ⁇ 10 4 to 1.0 ⁇ 10 8 Pa, more preferably It is 5.0 ⁇ 10 4 to 5.0 ⁇ 10 7 Pa, more preferably 1.0 ⁇ 10 5 to 1.0 ⁇ 10 7 Pa.
- the storage shear modulus G ′ (23) of the pressure-sensitive adhesive layer to which the semiconductor chip is attached is preferably within the above range, and the semiconductor chip is more than the expandable substrate.
- the storage shear modulus G ′ (23) of all the pressure-sensitive adhesive layers on the side to which the is attached is within the above range. If the storage shear modulus G ′ (23) of the first pressure-sensitive adhesive layer is 1.0 ⁇ 10 4 Pa or more, it is possible to prevent the positional deviation of the semiconductor chip and to the first pressure-sensitive adhesive layer of the semiconductor chip. It is also possible to prevent the sinking. On the other hand, if the storage shear modulus G ′ (23) of the first pressure-sensitive adhesive layer is 1.0 ⁇ 10 8 Pa or less, the surface of the first pressure-sensitive adhesive layer is caused by the expansion of the expandable particles in the expandable substrate. As a result, the surface can be easily peeled off with a slight force. In the present specification, the storage shear modulus G ′ (23) of the first pressure-sensitive adhesive layer means a value measured by the method described in Examples.
- the thickness of the 1st adhesive layer which the adhesive sheet of this embodiment has is the surface of a 1st adhesive layer by the viewpoint of expressing the outstanding adhesive force, and the expansion
- the ratio of the thickness of the expandable base material to the thickness of the first pressure-sensitive adhesive layer at 23 ° C. Is preferably 0.2 or more, more preferably 0.5 or more, still more preferably 1.0 or more, and even more preferably 5.0 or more, from the viewpoint of flattening and preventing misalignment of the semiconductor chip. Also, from the viewpoint of forming a pressure-sensitive adhesive sheet that can be easily peeled off with a slight force when peeled, it is preferably 1000 or less, more preferably 200 or less, still more preferably 60 or less, and even more preferably 30 or less.
- the thickness of a 1st adhesive layer means the value measured by the method as described in an Example.
- the first pressure-sensitive adhesive layer can be formed from a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive resin.
- a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive resin.
- the resin alone is preferably a polymer having adhesiveness and a mass average molecular weight (Mw) of 10,000 or more.
- the mass average molecular weight (Mw) of the adhesive resin used in the present embodiment is preferably 10,000 to 2,000,000, more preferably 20,000 to 1,500,000, and still more preferably 30,000, from the viewpoint of improving adhesive force. ⁇ 1 million.
- the adhesive resin examples include rubber resins such as acrylic resins, urethane resins, and polyisobutylene resins, polyester resins, olefin resins, silicone resins, and polyvinyl ether resins. These adhesive resins may be used independently and may use 2 or more types together. In addition, when these adhesive resins are copolymers having two or more kinds of structural units, the form of the copolymer is not particularly limited, and a block copolymer, a random copolymer, and a graft copolymer are not limited. Any of polymers may be used.
- the adhesive resin used in the present embodiment may be an energy ray curable adhesive resin in which a polymerizable functional group is introduced into the side chain of the above-mentioned adhesive resin.
- the polymerizable functional group include a (meth) acryloyl group and a vinyl group.
- energy rays include ultraviolet rays and electron beams, but ultraviolet rays are preferred.
- the content of the adhesive resin is preferably 30 to 99.99% by mass, more preferably 40 to 99.95% by mass, still more preferably based on the total amount (100% by mass) of the active ingredients of the adhesive composition. It is 50 to 99.90% by mass, more preferably 55 to 99.80% by mass, still more preferably 60 to 99.50% by mass.
- “content of each component relative to the total amount of active ingredients of the pressure-sensitive adhesive composition” means “content of each component in the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition”. Is synonymous with.
- the adhesive resin preferably contains an acrylic resin.
- the content of the acrylic resin in the adhesive resin is preferably 30 to 100% by mass, more preferably 50 to 100% by mass with respect to the total amount (100% by mass) of the adhesive resin contained in the adhesive composition. %, More preferably 70 to 100% by mass, and still more preferably 85 to 100% by mass.
- the acrylic resin that can be used as the adhesive resin has, for example, a polymer containing a structural unit derived from an alkyl (meth) acrylate having a linear or branched alkyl group, or a cyclic structure. Examples thereof include a polymer containing a structural unit derived from (meth) acrylate.
- the mass average molecular weight (Mw) of the acrylic resin is preferably 100,000 to 1,500,000, more preferably 200,000 to 1,300,000, still more preferably 350,000 to 1,200,000, still more preferably 500,000 to 1,100,000.
- acrylic resin examples include a structural unit (a1) derived from an alkyl (meth) acrylate (a1 ′) (hereinafter also referred to as “monomer (a1 ′)”) and a functional group-containing monomer (a2 ′) (hereinafter referred to as “monomer”).
- the acrylic copolymer (A1) having the structural unit (a2) derived from (a2 ′) ” is more preferable.
- the number of carbon atoms of the alkyl group contained in the monomer (a1 ′) is preferably 1 to 24, more preferably 1 to 12, still more preferably 2 to 10, and still more preferably 4 to 8 from the viewpoint of improving adhesive properties. It is.
- the alkyl group contained in the monomer (a1 ′) may be a linear alkyl group or a branched alkyl group.
- Examples of the monomer (a1 ′) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, tridecyl ( Examples include meth) acrylate and stearyl (meth) acrylate. These monomers (a1 ′) may be used alone or in combination of two or more. As the monomer (a1 ′), butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate are preferable.
- the content of the structural unit (a1) is preferably 50 to 99.9% by mass, more preferably 60 to 99.0% by mass with respect to the total structural unit (100% by mass) of the acrylic copolymer (A1). %, More preferably 70 to 97.0% by mass, and still more preferably 80 to 95.0% by mass.
- a hydroxyl group, a carboxy group, an amino group, an epoxy group etc. examples include a hydroxyl group-containing monomer, a carboxy group-containing monomer, an amino group-containing monomer, and an epoxy group-containing monomer. These monomers (a2 ′) may be used alone or in combination of two or more. Among these, as the monomer (a2 ′), a hydroxyl group-containing monomer and a carboxy group-containing monomer are preferable.
- Examples of the hydroxyl group-containing monomer include the same ones as the above-mentioned hydroxyl group-containing compound.
- carboxy group-containing monomer examples include ethylenically unsaturated monocarboxylic acids such as (meth) acrylic acid and crotonic acid; ethylenically unsaturated dicarboxylic acids such as fumaric acid, itaconic acid, maleic acid and citraconic acid, and anhydrides thereof.
- ethylenically unsaturated monocarboxylic acids such as (meth) acrylic acid and crotonic acid
- dicarboxylic acids such as fumaric acid, itaconic acid, maleic acid and citraconic acid, and anhydrides thereof.
- the content of the structural unit (a2) is preferably 0.1 to 40% by weight, more preferably 0.5 to 35% by weight with respect to all the structural units (100% by weight) of the acrylic copolymer (A1). %, More preferably 1.0 to 30% by mass, and still more preferably 3.0 to 25% by mass.
- the acrylic copolymer (A1) may further have a structural unit (a3) derived from another monomer (a3 ′) other than the monomers (a1 ′) and (a2 ′).
- the content of the structural units (a1) and (a2) is preferably 70 with respect to the total structural units (100% by mass) of the acrylic copolymer (A1).
- To 100% by mass more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and still more preferably 95 to 100% by mass.
- Examples of the monomer (a3 ′) include olefins such as ethylene, propylene, and isobutylene; halogenated olefins such as vinyl chloride and vinylidene chloride; diene monomers such as butadiene, isoprene, and chloroprene; cyclohexyl (meth) acrylate, It has a cyclic structure such as benzyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, imide (meth) acrylate, etc.
- olefins such as ethylene, propylene, and isobutylene
- halogenated olefins such as vinyl chloride and vinylidene chloride
- diene monomers such as butadiene, iso
- the acrylic copolymer (A1) may be an energy ray curable acrylic copolymer having a polymerizable functional group introduced in the side chain.
- the polymerizable functional group and the energy ray are as described above.
- the polymerizable functional group includes an acrylic copolymer having the above structural units (a1) and (a2), and a substituent that can be bonded to the functional group of the structural unit (a2) of the acrylic copolymer. And a compound having a polymerizable functional group can be reacted. Examples of the compound include (meth) acryloyloxyethyl isocyanate, (meth) acryloyl isocyanate, glycidyl (meth) acrylate, and the like.
- the adhesive composition contains an adhesive resin containing a functional group such as the above-mentioned acrylic copolymer (A1), it is preferable that the adhesive composition further contains a crosslinking agent.
- the said crosslinking agent reacts with the adhesive resin which has a functional group, and bridge
- crosslinking agent examples include an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, and a metal chelate crosslinking agent. These crosslinking agents may be used independently and may use 2 or more types together. Among these crosslinking agents, an isocyanate-based crosslinking agent is preferable from the viewpoints of increasing cohesive force and improving adhesive force, and availability.
- the content of the crosslinking agent is appropriately adjusted depending on the number of functional groups that the adhesive resin has, but is preferably 0.01 to 10 parts by mass with respect to 100 parts by mass of the adhesive resin having a functional group, The amount is more preferably 0.03 to 7 parts by mass, still more preferably 0.05 to 5 parts by mass.
- the pressure-sensitive adhesive composition may further contain a tackifier from the viewpoint of further improving the adhesive strength.
- the “tackifier” is a component that assists in improving the adhesive strength of the above-mentioned adhesive resin, and refers to an oligomer having a mass average molecular weight (Mw) of less than 10,000. It is distinguished from a functional resin.
- the mass average molecular weight (Mw) of the tackifier is preferably 400 to 10000, more preferably 500 to 8000, and still more preferably 800 to 5000.
- Examples of the tackifier are obtained by copolymerizing C5 fractions such as rosin resin, terpene resin, styrene resin, pentene, isoprene, piperine, 1,3-pentadiene generated by thermal decomposition of petroleum naphtha.
- C9 petroleum resin obtained by copolymerizing C9 fractions such as indene generated by thermal decomposition of petroleum naphtha and vinyltoluene, and hydrogenated resins obtained by hydrogenating these.
- the softening point of the tackifier is preferably 60 to 170 ° C, more preferably 65 to 160 ° C, and still more preferably 70 to 150 ° C.
- the “softening point” of the tackifier means a value measured according to JIS K2531.
- a tackifier may be used independently and may use 2 or more types from which a softening point, a structure, etc. differ. And when using 2 or more types of several tackifier, it is preferable that the weighted average of the softening point of these several tackifier belongs to the said range.
- the content of the tackifier is preferably 0.01 to 65% by mass, more preferably 0.05 to 55% by mass, and still more preferably relative to the total amount (100% by mass) of the active ingredients of the adhesive composition. It is 0.1 to 50% by mass, more preferably 0.5 to 45% by mass, still more preferably 1.0 to 40% by mass.
- an adhesive composition contains an energy-beam curable adhesive resin as an adhesive resin
- the adhesive layer formed from the adhesive composition can be irradiated with relatively low energy energy rays. It is possible to sufficiently advance the curing reaction and adjust the adhesive strength to a desired range.
- a photoinitiator the same thing as what is mix
- the content of the photopolymerization initiator is preferably 0.01 to 10 parts by mass, more preferably 0.03 to 5 parts by mass, and still more preferably 0.001 parts by mass with respect to 100 parts by mass of the energy ray curable adhesive resin. 05 to 2 parts by mass.
- the pressure-sensitive adhesive composition which is a material for forming the first pressure-sensitive adhesive layer, is a pressure-sensitive adhesive used for general pressure-sensitive adhesives in addition to the additives described above, as long as the effects of the present invention are not impaired. May contain additives.
- an adhesive additive include antioxidants, softeners (plasticizers), rust inhibitors, pigments, dyes, retarders, reaction accelerators (catalysts), ultraviolet absorbers, and the like. These pressure-sensitive adhesive additives may be used alone or in combination of two or more.
- each pressure-sensitive adhesive additive is preferably 0.0001 to 20 parts by mass, more preferably 0.001 to 100 parts by mass of the adhesive resin. ⁇ 10 parts by mass.
- the pressure-sensitive adhesive composition that is a material for forming the pressure-sensitive adhesive layer may contain expandable particles as long as the effects of the present invention are not impaired.
- the first pressure-sensitive adhesive layer is preferably a non-expandable pressure-sensitive adhesive layer. Therefore, the pressure-sensitive adhesive composition, which is a material for forming the pressure-sensitive adhesive layer, is more preferable as the content of the expandable particles is as small as possible.
- the content of the expandable particles is preferably less than 5% by mass, more preferably less than 1% by mass, and even more preferably less than 0.1% by mass with respect to the total amount (100% by mass) of the active ingredients of the pressure-sensitive adhesive composition. More preferably, it is less than 0.01% by mass, particularly preferably less than 0.001% by mass.
- the 2nd adhesive layer which the adhesive sheet of this embodiment has should just contain adhesive resin, and for adhesives, such as a crosslinking agent, a tackifier, a polymerization compound, and a polymerization initiator, if needed.
- An additive may be contained.
- the preferable aspect of a composition and a form of a 2nd adhesive layer is the same as that of a 1st adhesive layer.
- the composition of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be the same or different.
- the form of a 1st adhesive layer and a 2nd adhesive layer may be the same, or may differ.
- the storage shear modulus G ′ (23) of the second pressure-sensitive adhesive layer is preferably 1.0 ⁇ 10 4 to 1.0 ⁇ 10 8 Pa from the viewpoint of improving the adhesion to the support and the like.
- the pressure is preferably 3.0 ⁇ 10 4 to 5.0 ⁇ 10 7 Pa, more preferably 5.0 ⁇ 10 4 to 1.0 ⁇ 10 7 Pa.
- the adhesive sheet of this embodiment may have a peeling material further on the adhesive surface of a 1st adhesive layer and / or a 2nd adhesive layer.
- a release sheet that has been subjected to a double-sided release process, a release sheet that has been subjected to a single-sided release process, or the like is used.
- Examples of the base material for the release material include papers such as high-quality paper, glassine paper, and craft paper; polyester resin films such as polyethylene terephthalate resin, polybutylene terephthalate resin, and polyethylene naphthalate resin, polypropylene resin, and polyethylene resin. Examples thereof include plastic films such as olefin resin films.
- release agent examples include silicone-based resins, olefin-based resins, isoprene-based resins, rubber-based elastomers such as butadiene-based resins, long-chain alkyl-based resins, alkyd-based resins, and fluorine-based resins.
- the thickness of the release material is not particularly limited, but is preferably 10 to 200 ⁇ m, more preferably 25 to 170 ⁇ m, and still more preferably 35 to 80 ⁇ m.
- the method for producing the double-sided pressure-sensitive adhesive sheet according to this embodiment is not particularly limited, and examples thereof include a production method (a) having the following steps (1a) to (4a).
- Step (1a) After applying a resin composition (y), which is a material for forming an expandable base material, on the release treatment surface of the release material to form a coating film, and then drying or UV curing the coating film The process which peels a peeling material from the expandable base material obtained.
- Step (1b) A pressure-sensitive adhesive composition, which is a material for forming the first pressure-sensitive adhesive layer, is applied on the release-treated surface of the release material to form a coating film, the coating film is dried, and the first pressure-sensitive adhesive Forming a layer;
- a pressure-sensitive adhesive composition which is a material for forming the second pressure-sensitive adhesive layer, is applied to form a coating film, the coating film is dried, 2 The process of forming an adhesive layer.
- the resin composition (y) and the pressure-sensitive adhesive composition may be further mixed with a diluent solvent to form a solution.
- a diluent solvent examples include spin coating, spray coating, bar coating, knife coating, roll coating, blade coating, die coating, and gravure coating.
- drying or UV irradiation which forms an expansible base material from the coating film of the process (1a) of a manufacturing method (a) and the process (1b) of a manufacturing method (b) is the conditions which an expansible particle does not expand
- the drying temperature is preferably less than the expansion start temperature (t) of the thermally expandable particles.
- the method for manufacturing a semiconductor device according to the present embodiment is a method for manufacturing a semiconductor device using the double-sided pressure-sensitive adhesive sheet, and includes the following steps (1) to (4).
- Step (3) The semiconductor chip and the periphery of the semiconductor chip of the adhesive surface of the first pressure-sensitive adhesive layer are covered with a sealing material, the sealing material is cured, and the semiconductor chip is cured and sealed.
- FIG. 2A is a cross-sectional view illustrating a step (1) of attaching the hard support 20 to the adhesive surface 122a of the second pressure-sensitive adhesive layer 122 of the double-sided pressure-sensitive adhesive sheet 10.
- FIG. 2A is a cross-sectional view illustrating a step (1) of attaching the hard support 20 to the adhesive surface 122a of the second pressure-sensitive adhesive layer 122 of the double-sided pressure-sensitive adhesive sheet 10.
- the peeling material 132 is peeled beforehand.
- the hard support 20 is affixed to the pressure-sensitive adhesive surface 122a of the second pressure-sensitive adhesive layer 122, and is used for the purpose of obtaining a cured sealing body having excellent flatness in the steps (2) and (3). It is. From the viewpoint of achieving the above object, the hard support 20 is preferably attached to the entire surface of the adhesive surface 122 (a) as shown in FIG. 2 (A). Therefore, the hard support 20 is preferably plate-shaped, and the area of the surface to be attached to the adhesive surface 122a is preferably equal to or larger than the area of the adhesive surface 122a.
- the material of the hard support 20 may be appropriately determined in consideration of mechanical strength, heat resistance, and the like.
- a metal material such as SUS
- a non-metallic inorganic material such as glass or silicon wear
- composite materials such as glass epoxy resins are exemplified, and among these, SUS, glass, silicon wafer and the like are preferable.
- the thickness of the hard support 20 may be appropriately determined in consideration of mechanical strength, handleability, etc., and is, for example, 100 ⁇ m to 50 mm.
- FIG. 2B shows a cross-sectional view for explaining the step (2) of placing the semiconductor chip CP on a part of the adhesive surface 121a of the first adhesive layer 121.
- the peeling material 131 is peeled beforehand.
- a conventionally known semiconductor chip CP can be used.
- the semiconductor chip CP is formed with an integrated circuit composed of circuit elements such as transistors, resistors, and capacitors on the circuit surface W1.
- the semiconductor chip CP is placed so that the circuit surface W1 is covered with the adhesive surface 121a.
- a known device such as a flip chip bonder or a die bonder can be used for mounting the semiconductor chip CP. The layout, the number of arrangement, etc.
- the manufacturing method of the semiconductor device according to the present embodiment covers the semiconductor chip CP with a sealing material in an area larger than the chip size, such as FOWLP, FOPLP, etc., and only the circuit surface W1 of the semiconductor chip CP
- the present invention is suitably applied to a package for forming a rewiring layer even in the surface region of the sealing material. Therefore, the semiconductor chip CP is placed on a part of the adhesive surface 121a of the first adhesive layer 121, and the adhesive surface 121a is in a state where the plurality of semiconductor chips CP are aligned with a certain interval.
- the plurality of semiconductor chips CP are more preferably placed on the adhesive surface 121a in a state of being arranged in a matrix of a plurality of rows and a plurality of columns with a certain interval.
- the interval between the semiconductor chips CP may be appropriately determined according to the target package form and the like.
- the peripheral portion 30 of the semiconductor chip CP is formed on the adhesive surface 121a of the first adhesive layer 121.
- the peripheral portion 30 of the semiconductor chip CP is an adhesive surface 121a of the first adhesive layer 121 corresponding to a gap between adjacent semiconductor chips CP among the plurality of semiconductor chips CP.
- FIG. 3 A cross-sectional view illustrating a step (3) of obtaining a cured sealing body 50 obtained by curing the stopper 40 and sealing the semiconductor chip CP with the cured sealing material 41 is shown.
- the step of covering the semiconductor chip CP and the peripheral portion 30 of the semiconductor chip CP in the adhesive surface 121a of the first adhesive layer 121 with the sealing material 40 may be referred to as a “covering step”.
- the process of curing the sealing material 40 to obtain the cured sealing body 50 in which the semiconductor chip CP is sealed with the cured sealing material 41 may be referred to as a “curing process”.
- the semiconductor chip CP and the peripheral portion 30 of the semiconductor chip CP among the adhesive surface 121a of the first adhesive layer 121 are sealed with the sealing material 40.
- the sealing material 40 fills the gaps between the plurality of semiconductor chips CP while covering the entire exposed surface of the semiconductor chip CP.
- the sealing material 40 has a function of protecting the semiconductor chip CP and its accompanying elements from the external environment. There is no restriction
- the sealing material 40 has curability from the viewpoint of mechanical strength, heat resistance, insulation, and the like, and examples thereof include a thermosetting resin composition and an energy ray curable resin composition. Hereinafter, in this embodiment, the sealing material 40 is demonstrated as what is a thermosetting resin composition.
- thermosetting resin contained in the thermosetting resin composition that is the sealing material 40 examples include an epoxy resin, a phenol resin, and a cyanate resin. However, mechanical strength, heat resistance, insulation, and moldability From the viewpoint of the above, an epoxy resin is preferable.
- the thermosetting resin composition if necessary, a phenol resin curing agent, a curing agent such as an amine curing agent, a curing accelerator, an inorganic filler such as silica, You may contain additives, such as an elastomer.
- the sealing material 40 may be solid or liquid at room temperature.
- the form of the sealing material 40 which is solid at room temperature is not specifically limited, For example, a granular form, a sheet form, etc. may be sufficient.
- any method can be appropriately selected and applied from methods conventionally used in the semiconductor sealing process.
- a roll laminating method, a vacuum pressing method, a vacuum laminating method, a spin coating method, a die coating method, a transfer molding method, a compression molding mold method and the like can be applied.
- the sealing material 40 is heated during coating to impart fluidity.
- the sealing material 40 is cured to obtain a cured sealing body 50 in which the semiconductor chip CP is sealed with the cured sealing material 41.
- the double-sided pressure-sensitive adhesive sheet 10 used in the present embodiment contains expandable particles that expand due to heat, energy rays, etc., and in the step (4) described later, the expandable particles. Is expanded to reduce the adhesive force between the adhesive surface 121a and the cured sealing body 50, and the double-sided adhesive sheet 10 is peeled off from the cured sealing body 50. Therefore, in the coating step and the curing step, it is preferable that the sealing material 40 is coated and cured by appropriately selecting conditions under which the expandable particles do not expand.
- the heating conditions (heating temperature and heating time) in the coating step and the curing step are double-sided pressure-sensitive adhesive sheets resulting from the expansion of the heat-expandable particles.
- the heating condition in which the increase rate of the thickness of 10 is 10% or less is preferable, the heating condition in which the increase rate is 5% or less is more preferable, and the heating condition in which the increase rate is 0% (that is, thermally expandable particles More preferred is a heating condition in which does not expand.
- the rate of increase in the thickness of the double-sided pressure-sensitive adhesive sheet 10 is, for example, the thickness of the double-sided pressure-sensitive adhesive sheet 10 before and after heating under a predetermined condition according to JIS K6783, Z1702, and Z1709. Measured using a product name “PG-02” manufactured by Teclock, and can be calculated based on the following formula.
- Thickness increase rate (%) (Thickness after heating ⁇ Thickness before heating) ⁇ 100 / Thickness before heating
- the coating process and the curing process may be performed separately.
- the sealing material 40 may be cured as it is by the heating. That is, in that case, the covering step and the curing step may be performed simultaneously.
- thermosetting resin composition is used as the sealing material 40 and heat-expandable particles are used as the expandable particles.
- the sealing material 40 is an energy ray curable resin composition
- the expandable particle is an energy ray expandable particle.
- the increasing rate of the thickness of the double-sided pressure-sensitive adhesive sheet 10 in the coating step and the curing step satisfies the above-described range.
- thermosetting resin composition is heated in the coating step
- the heating time is, for example, 5 seconds to 60 minutes, preferably 10 seconds to 45 minutes, and more preferably 15 seconds to 30 minutes.
- specific examples of the temperature at which the sealing material 40 is cured vary depending on the type of the sealing material 40 used, the type of the expandable particles, and the like, but are, for example, 80 to 240 ° C. ° C is preferred, and 100 to 170 ° C is more preferred.
- the heating time is, for example, 10 to 180 minutes, preferably 20 to 150 minutes, and more preferably 30 to 120 minutes.
- the covering step and the curing step using a sheet-like sealing material (hereinafter also referred to as “sheet-like sealing material”).
- sheet-like sealing material a sheet-like sealing material
- the semiconductor chip CP and the peripheral portion 30 are covered with the sealing material 40 by placing the sheet-shaped sealing material so as to cover the semiconductor chip CP and the peripheral portion 30 thereof.
- Preferred embodiments of the reduced pressure, heating and pressure bonding conditions are as described above.
- the laminated sealing material 40 is heated and cured.
- the sheet-like sealing material may be a laminated sheet supported by a resin sheet such as polyethylene terephthalate.
- the resin sheet may be peeled off from the sealing material after placing the laminated sheet so that the sheet-shaped sealing material covers the semiconductor chip CP and the peripheral portion 30 thereof.
- a cured sealing body 50 in which a plurality of semiconductor chips CP separated by a predetermined distance are embedded in the curing sealing material 41 is obtained.
- FIG. 2E shows a cross-sectional view for explaining the step (4) in which the expandable particles are expanded to peel the double-sided pressure-sensitive adhesive sheet 10 from the cured sealing body 50.
- the expandable particles are expanded by heat, energy rays, or the like according to the type thereof, thereby forming irregularities on the adhesive surface 121a of the first adhesive layer 121, thereby forming the adhesive surface 121a and The adhesive force with the cured sealing body 50 is reduced, and the double-sided pressure-sensitive adhesive sheet 10 is peeled off.
- the hard support 20 is affixed to the adhesive surface 122a of the second adhesive layer 122, unevenness is formed on the adhesive surface 122a side of the second adhesive layer 122. Is suppressed, whereby unevenness can be efficiently formed on the adhesive surface 121a side of the first pressure-sensitive adhesive layer 121, and excellent peelability can be obtained. What is necessary is just to select suitably as a method of expanding an expandable particle according to the kind of expandable particle.
- the expandable particles are thermally expandable particles, they may be heated to a temperature equal to or higher than the expansion start temperature (t).
- the “temperature higher than the expansion start temperature (t)” is preferably “expansion start temperature (t) + 10 ° C.” or higher and “expansion start temperature (t) + 60 ° C.” or lower. It is more preferable that it is not less than “t) + 15 ° C.” and not more than “expansion start temperature (t) + 40 ° C.”. Specifically, depending on the type of the thermally expandable particles, for example, it may be heated and expanded in the range of 120 to 250 ° C.
- the double-sided pressure-sensitive adhesive sheet 10 is peeled from the cured sealing body 50. Since the double-sided pressure-sensitive adhesive sheet 10 according to the present embodiment has excellent peelability, it can be peeled with an external force smaller than that of a conventional temporary fixing sheet.
- the method to peel is not specifically limited, For example, the method of peeling from the hardening sealing body 50 using the debonder from the double-sided adhesive sheet 10 is mentioned.
- the thickness of the cured sealing body 50 is reduced as necessary.
- a grinding step may be included.
- the manufacturing method which concerns on this embodiment includes the process (5) which forms a rewiring layer in the hardening sealing body 50 which peeled the double-sided adhesive sheet 10.
- FIG. FIG. 3A shows a cross-sectional view of the cured sealing body 50 after the double-sided pressure-sensitive adhesive sheet 10 is peeled off.
- rewirings connected to the circuit W2 of the plurality of exposed semiconductor chips CP are formed on the circuit surface W1 and on the surface 50a of the cured sealing body 50 corresponding to the outside of the region of the semiconductor chip CP. .
- FIG. 3B is a cross-sectional view illustrating a process of forming the first insulating layer 61 on the circuit surface W1 of the semiconductor chip CP and the surface 50a of the cured sealing body 50.
- a first insulating layer 61 containing an insulating resin is formed on the circuit surface W1 and the surface 50a so as to expose the circuit W2 of the semiconductor chip CP or the internal terminal electrode W3 of the circuit W2.
- the insulating resin include polyimide resin, polybenzoxazole resin, and silicone resin.
- the material of the internal terminal electrode W3 is not limited as long as it is a conductive material, and examples thereof include metals such as gold, silver, copper, and aluminum, and alloys containing these metals.
- FIG. 3C is a cross-sectional view illustrating a process of forming the rewiring 70 that is electrically connected to the semiconductor chip CP sealed in the cured sealing body 50.
- the rewiring 70 is formed following the formation of the first insulating layer 61.
- the material of the rewiring 70 is not limited as long as it is a conductive material, and examples thereof include metals such as gold, silver, copper, and aluminum, and alloys containing these metals.
- the rewiring 70 can be formed by a known method such as a subtractive method or a semi-additive method.
- FIG. 4A is a cross-sectional view illustrating a process of forming the second insulating layer 62 that covers the rewiring 70.
- the rewiring 70 has external electrode pads 70A for external terminal electrodes.
- the second insulating layer 62 is provided with an opening or the like to expose the external electrode pad 70A for the external terminal electrode.
- the external electrode pads 70A are inside and outside the region of the semiconductor chip CP of the cured sealing body 50 (a region corresponding to the circuit surface W1) and outside the region (a region corresponding to the surface 50a on the cured sealing body 50). It is exposed to.
- the rewiring 70 is formed on the surface 50a of the cured sealing body 50 so that the external electrode pads 70A are arranged in an array. In the present embodiment, since the external electrode pad 70A is exposed outside the region of the semiconductor chip CP of the cured sealing body 50, FOWLP or FOPLP can be obtained.
- FIG. 4B is a cross-sectional view illustrating a process of connecting the external terminal electrode 80 to the external electrode pad 70A.
- An external terminal electrode 80 such as a solder ball is placed on the external electrode pad 70A exposed from the second insulating layer 62, and the external terminal electrode 80 and the external electrode pad 70A are electrically connected by solder bonding or the like.
- the material of the solder ball is not particularly limited, and examples thereof include lead-containing solder and lead-free solder.
- FIG. 4C is a cross-sectional view illustrating a process of separating the cured sealing body 50 to which the external terminal electrode 80 is connected.
- the cured sealing body 50 is singulated for each semiconductor chip CP.
- the method for dividing the cured sealing body 50 into individual pieces is not particularly limited, and can be performed by a cutting means such as a dicing saw.
- the semiconductor device 100 in units of the semiconductor chip CP is manufactured.
- the semiconductor device 100 in which the external terminal electrode 80 is connected to the external electrode pad 70A fanned out outside the region of the semiconductor chip CP is manufactured as FOWLP, FOPLP, or the like.
- the particle distribution of the thermally expandable particles before expansion at 23 ° C. was measured using a laser diffraction particle size distribution measuring apparatus (for example, product name “Mastersizer 3000” manufactured by Malvern).
- the particle diameters corresponding to 50% and 90% of the cumulative volume frequency calculated from the smaller particle diameter of the particle distribution are expressed as “average particle diameter (D 50 ) of thermally expandable particles” and “thermally expandable particles”, respectively.
- ⁇ Storage elastic modulus E 'of expandable substrate> When the measurement target was a non-adhesive expandable base material, the expandable base material was 5 mm long ⁇ 30 mm wide ⁇ 200 ⁇ m thick, and the test piece was prepared by removing the release material. Using a dynamic viscoelasticity measuring apparatus (product name “DMAQ800” manufactured by TA Instruments Inc.), the test start temperature is 0 ° C., the test end temperature is 300 ° C., the heating rate is 3 ° C./min, the frequency is 1 Hz, and the amplitude is 20 ⁇ m. Under the conditions, the storage elastic modulus E ′ of the test sample at a predetermined temperature was measured.
- DMAQ800 dynamic viscoelasticity measuring apparatus
- a viscoelasticity measuring device manufactured by Anton Paar, device name “MCR300”
- a torsional shear method under conditions of a test start temperature of 0 ° C., a test end temperature of 300 ° C., a heating rate of 3 ° C./min, and a frequency of 1 Hz was used to measure the storage shear modulus G ′ of the test sample at a given temperature.
- a stainless steel probe having a diameter of 5 mm is brought into contact with the surface of the test sample at a contact load of 0.98 N / cm 2 for 1 second, and then the probe is tested at a speed of 10 mm / second. The force required to move away from the surface was measured. And the measured value was made into the probe tack value of the test sample.
- Acrylic copolymer (i): having a structural unit derived from a raw material monomer consisting of 2-ethylhexyl acrylate (2EHA) / 2-hydroxyethyl acrylate (HEA) 80.0 / 20.0 (mass ratio), A solution containing an acrylic copolymer having a mass average molecular weight (Mw) of 600,000. Diluting solvent: ethyl acetate, solid content concentration: 40% by mass.
- Acrylic copolymer (ii): n-butyl acrylate (BA) / methyl methacrylate (MMA) / 2-hydroxyethyl acrylate (HEA) / acrylic acid 86.0 / 8.0 / 5.0 / 1.
- first adhesive layer (X-1) The isocyanate-based crosslinking agent (i) 5.0 parts by mass (solid content ratio) is blended with 100 parts by mass of the solid content of the acrylic copolymer (i), which is an adhesive resin, and diluted with toluene.
- the composition (x-1) having a solid content concentration (active ingredient concentration) of 25% by mass was prepared by stirring uniformly. Then, on the surface of the release agent layer of the above heavy release film, the prepared composition (x-1) was applied to form a coating film, and the coating film was dried at 100 ° C. for 60 seconds to have a thickness of 10 ⁇ m.
- the first pressure-sensitive adhesive layer (X-1) was formed.
- the storage shear modulus G ′ (23) of the first pressure-sensitive adhesive layer (X-1) at 23 ° C. was 2.5 ⁇ 10 5 Pa.
- Second adhesive layer (X-2) The isocyanate-based crosslinking agent (i) 0.8 parts by mass (solid content ratio) is blended with 100 parts by mass of the acrylic copolymer (ii), which is an adhesive resin, and diluted with toluene, The composition (x-2) having a solid content concentration (active ingredient concentration) of 25% by mass was prepared by stirring uniformly. Then, on the surface of the release agent layer of the light release film, the prepared composition (x-2) was applied to form a coating film, and the coating film was dried at 100 ° C. for 60 seconds to have a thickness of 10 ⁇ m. The second pressure-sensitive adhesive layer (X-2) was formed. The storage shear modulus G ′ (23) of the second pressure-sensitive adhesive layer (X-2) at 23 ° C. was 9.0 ⁇ 10 4 Pa.
- the product name “Irgacure 184”) 2.0 parts by mass (solid content ratio) and 0.2 parts by mass (solid content ratio) phthalocyanine pigment as an additive were blended to prepare an energy ray curable composition. . And the said heat-expandable particle
- the isocyanate-based crosslinking agent (i) is 6.3 parts by mass with respect to 100 parts by mass of the solid content of the acrylic urethane resin solution obtained in (2) above. (Solid content ratio), 1.4 parts by weight (solid content ratio) of dioctyltin bis (2-ethylhexanoate) as a catalyst, and the above-mentioned thermally expandable particles (i) were mixed, diluted with toluene, and uniformly By stirring, a composition (y-2) having a solid content concentration (active ingredient concentration) of 30% by mass was prepared.
- the content of the heat-expandable particles (i) relative to the total amount (100% by mass) of active ingredients in the obtained composition (y-2) was 20% by mass. Then, on the surface of the release agent layer of the light release film, the prepared composition (y-2) was applied to form a coating film, and the coating film was dried at 100 ° C. for 120 seconds to have a thickness of 50 ⁇ m.
- the expandable substrate (Y-2) was formed.
- the prepared composition (y-3) was applied to form a coating film, and the coating film was dried at 100 ° C. for 120 seconds to have a thickness of 50 ⁇ m.
- An expandable pressure-sensitive adhesive layer (Y-3) was formed.
- the expandable substrates (Y-1) to (Y-2) formed in Production Examples 3 to 4 and the expandable pressure-sensitive adhesive layer (Y-3) formed in Production Example 5 were used.
- Example 1 The surfaces of the first pressure-sensitive adhesive layer (X-1) formed in Production Example 1 and the expandable base material (Y-1) formed in Production Example 3 were bonded together to expand the expandable base material (Y-1). The light release film on the side was removed, and the second pressure-sensitive adhesive layer (X-2) formed in Production Example 2 was bonded onto the surface of the exposed expandable substrate (Y-1). Thus, a pressure-sensitive adhesive sheet in which a light release film / second pressure-sensitive adhesive layer (X-2) / expandable base material (Y-1) / first pressure-sensitive adhesive layer (X-1) / heavy release film was laminated in this order. (1) was produced.
- Example 2 A light release film / second pressure-sensitive adhesive layer (in the same manner as in Example 1 except that the expandable substrate (Y-1) was replaced with the expandable substrate (Y-2) formed in Production Example 4.
- a pressure-sensitive adhesive sheet (2) was prepared by laminating X-2) / expandable substrate (Y-2) / first pressure-sensitive adhesive layer (X-1) / heavy release film in this order.
- Comparative Example 1 The surfaces of the second pressure-sensitive adhesive layer (X-2) formed in Production Example 2 and the expandable pressure-sensitive adhesive layer (Y-3) formed in Production Example 5 were bonded together. Then, the light release film on the expandable pressure-sensitive adhesive layer (Y-3) side is removed, and the first pressure-sensitive adhesive layer formed in Production Example 1 on the surface of the exposed expandable pressure-sensitive adhesive layer (Y-3) (X-1) was bonded. Thus, a light release film / second pressure-sensitive adhesive layer (X-2) / expandable pressure-sensitive adhesive layer (Y-3) / first pressure-sensitive adhesive layer (X-1) / heavy release film was laminated in this order. A sheet (3) was produced.
- the adhesive surface of (X-1) and the semiconductor chip were covered with a sealing material, and the sealing material was cured to produce a cured sealing body.
- the sealing conditions are as follows. -Preheating temperature: 100 ° C for both table and diaphragm ⁇ Vacuum drawing: 60 seconds ⁇ Dynamic press mode: 30 seconds ⁇ Static press mode: 10 seconds ⁇ Sealing temperature: 180 ° C. (temperature lower than 208 ° C. which is the expansion start temperature of thermally expandable particles) ⁇ Sealing time: 60 minutes
- the pressure-sensitive adhesive sheets (1) to (4) are heated for 3 minutes at 240 ° C., which is equal to or higher than the expansion start temperature (208 ° C.) of the thermally expandable particles.
- the stop body was separated, the semiconductor chip on the surface of the separated cured sealing body (rewiring layer forming surface) was observed visually and with a microscope, and the presence or absence of misalignment of the semiconductor chip was confirmed and evaluated according to the following criteria: .
- A A semiconductor chip in which a positional deviation of 25 ⁇ m or more from before sealing was not confirmed.
- F A semiconductor chip in which a positional deviation of 25 ⁇ m or more occurred before sealing was confirmed.
- test sample was affixed to the plate and allowed to stand for 24 hours in an environment of 23 ° C. and 50% RH (relative humidity). Further, the light release film on the expandable pressure-sensitive adhesive layer (Y-3) side of the pressure-sensitive adhesive sheet (4) is removed, and the pressure-sensitive adhesive sheet (1) is applied to the pressure-sensitive adhesive surface of the expandable pressure-sensitive adhesive layer (Y-3). ) To (3), a test sample was prepared. Then, using the above test sample, in an environment of 23 ° C. and 50% RH (relative humidity), in accordance with JIS Z0237: 2000, by a 180 ° peeling method at a pulling speed of 300 mm / min at 23 ° C. The adhesive strength was measured.
- the above test sample is heated on a hot plate at 240 ° C., which is equal to or higher than the expansion start temperature (208 ° C.) of the thermally expandable particles, for 3 minutes to obtain a standard environment (23 ° C., 50% RH (relative humidity)).
- the adhesive strength after heating at a temperature equal to or higher than the expansion start temperature was also measured at a pulling rate of 300 mm / min by a 180 ° peeling method based on JIS Z0237: 2000.
- the semiconductor chip is highly effective in suppressing the sinking of the semiconductor chip during heating during the sealing process.
- the surface of the semiconductor chip after the sealing step was also flat.
- the pressure-sensitive adhesive sheets (1) and (2) have good pressure-sensitive adhesive strength before heating, but the pressure-sensitive adhesive strength is reduced to such an extent that they cannot be measured after heating at or above the expansion start temperature. In some cases, the results proved that they were easily peelable with a slight force.
- the pressure-sensitive adhesive sheet (3) of Comparative Example 1 and the pressure-sensitive adhesive sheet (4) of Comparative Example 2 have an expandable pressure-sensitive adhesive layer instead of an expandable base material.
- the semiconductor chip was displaced, and a step was observed on the surface (rewiring layer forming surface) on the semiconductor chip side after the sealing process. Therefore, for example, it is considered that it is not suitable for use in a sealing process when manufacturing FOWLP and FOPLP.
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
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KR1020197027798A KR102454056B1 (ko) | 2017-03-31 | 2018-03-29 | 반도체 장치의 제조 방법 및 양면 점착 시트 |
CN201880022512.4A CN110476241B (zh) | 2017-03-31 | 2018-03-29 | 半导体装置的制造方法及双面粘合片 |
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WO2020217955A1 (fr) * | 2019-04-26 | 2020-10-29 | 三井化学東セロ株式会社 | Film adhésif et procédé de fabrication de dispositif électronique |
KR20210129172A (ko) * | 2019-03-14 | 2021-10-27 | 미쓰이 가가쿠 토세로 가부시키가이샤 | 전자 장치의 제조 방법 |
WO2022202216A1 (fr) * | 2021-03-23 | 2022-09-29 | リンテック株式会社 | Feuille de câblage pour moulage tridimensionnel |
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KR20210148102A (ko) * | 2019-03-28 | 2021-12-07 | 린텍 가부시키가이샤 | 점착 시트, 점착 시트의 제조 방법 및 반도체 장치의 제조 방법 |
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JP2000248240A (ja) * | 1999-03-01 | 2000-09-12 | Nitto Denko Corp | 加熱剥離型粘着シート |
US20160005628A1 (en) * | 2014-07-01 | 2016-01-07 | Freescal Semiconductor, Inc. | Wafer level packaging method and integrated electronic package |
Cited By (6)
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KR20210129172A (ko) * | 2019-03-14 | 2021-10-27 | 미쓰이 가가쿠 토세로 가부시키가이샤 | 전자 장치의 제조 방법 |
KR102619307B1 (ko) | 2019-03-14 | 2024-01-03 | 미쓰이 가가쿠 토세로 가부시키가이샤 | 전자 장치의 제조 방법 |
WO2020217955A1 (fr) * | 2019-04-26 | 2020-10-29 | 三井化学東セロ株式会社 | Film adhésif et procédé de fabrication de dispositif électronique |
JPWO2020217955A1 (fr) * | 2019-04-26 | 2020-10-29 | ||
JP7217344B2 (ja) | 2019-04-26 | 2023-02-02 | 三井化学東セロ株式会社 | 粘着性フィルムおよび電子装置の製造方法 |
WO2022202216A1 (fr) * | 2021-03-23 | 2022-09-29 | リンテック株式会社 | Feuille de câblage pour moulage tridimensionnel |
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JP6761115B2 (ja) | 2020-09-23 |
TWI760469B (zh) | 2022-04-11 |
KR20190132385A (ko) | 2019-11-27 |
KR102454056B1 (ko) | 2022-10-14 |
JPWO2018181766A1 (ja) | 2020-02-06 |
CN110476241A (zh) | 2019-11-19 |
CN110476241B (zh) | 2023-05-09 |
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