WO2010023907A1 - 半導体樹脂パッケージ製造用金型離型フィルム、およびそれを用いた半導体樹脂パッケージの製造方法 - Google Patents
半導体樹脂パッケージ製造用金型離型フィルム、およびそれを用いた半導体樹脂パッケージの製造方法 Download PDFInfo
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- WO2010023907A1 WO2010023907A1 PCT/JP2009/004143 JP2009004143W WO2010023907A1 WO 2010023907 A1 WO2010023907 A1 WO 2010023907A1 JP 2009004143 W JP2009004143 W JP 2009004143W WO 2010023907 A1 WO2010023907 A1 WO 2010023907A1
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- WIPO (PCT)
- Prior art keywords
- release film
- mold
- layer
- resin package
- methyl
- Prior art date
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Classifications
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- 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
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/14—Monomers containing five or more carbon atoms
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- 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
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
- B29C45/14655—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components connected to or mounted on a carrier, e.g. lead frame
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- 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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
- H01L2924/1815—Shape
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31725—Of polyamide
- Y10T428/31739—Nylon type
- Y10T428/31743—Next to addition polymer from unsaturated monomer[s]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31725—Of polyamide
- Y10T428/3175—Next to addition polymer from unsaturated monomer[s]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon
Definitions
- the present invention relates to a mold release film for producing a semiconductor resin package, and a method for producing a semiconductor resin package using the same.
- a semiconductor chip is usually used as a semiconductor resin package sealed with a sealing material.
- the semiconductor resin package is generally obtained by transfer molding, in which a semiconductor chip is loaded into a cavity of a mold and the cavity is filled with a sealant containing an epoxy resin as a main component.
- the following points have been problems in the conventional transfer molding. 1) Since the sealing material may contaminate the inner surface of the mold, the mold needs to be cleaned and the working efficiency is reduced. 2) The mold life is short because the inner surface of the mold is damaged. 3) Burrs are likely to occur in the molded semiconductor resin package.
- a method (also referred to as "film assist molding") is known in which a mold release sheet such as a polytetrafluoroethylene (PTFE) -based sheet is disposed in a mold and molded.
- PTFE polytetrafluoroethylene
- a PTFE-based sheet is easily wrinkled in a mold, there is a problem that it is difficult to obtain a semiconductor resin package having a desired shape in this method.
- a PTFE-based sheet generates fluorine-based gas at the time of incineration, there is also a problem that disposal is not easy.
- release sheets for semiconductor molds include a layer (A layer) responsible for mold release from a molded product and a layer (B layer) responsible for heat resistance to heating during molding, and the peel force from the molded product is specified
- a layer responsible for mold release from a molded product
- B layer responsible for heat resistance to heating during molding
- the release sheet adjusted to the range of is proposed (for example, patent document 1).
- the document specifically discloses a release sheet having a three-layer structure “poly 4-methyl-1-pentene / adhesive layer / PET”.
- a five-layer structure consisting of A layer (surface layer), B layer (adhesive layer), C layer (base layer), B 'layer (adhesive layer) and A' layer (surface layer) It is a film which A layer (surface layer) and A 'layer (surface layer) have, and a film which contains 4-methyl- 1-pentene type polymer resin is proposed (for example, patent documents 2). The document discloses that this film is suitable as a release film in the production of multilayer printed circuit boards.
- the release sheet described in Patent Document 1 has a laminate structure that is asymmetric with respect to the center layer, and therefore, warpage easily occurs. Therefore, when the mold release sheet described in Patent Document 1 is used as a mold release sheet and the mold release sheet is introduced into the mold and vacuum-sucked, longitudinal wrinkles are induced or the inner surface of the mold cavity is It has been difficult to cause the release sheet to be adsorbed stably, for example, due to non-adherence.
- the longitudinal wrinkles are wrinkles generated along the longitudinal direction of the release sheet in the plane of the release sheet.
- the release sheet can not be stably vacuum-adsorbed on the inner surface of the mold because warping, wrinkles, etc. occur.
- wrinkles and the like of the release sheet may be transferred to the semiconductor resin package which is a molded product, and a semiconductor resin package having a desired shape may not be obtained.
- the present invention aims to provide a release film which is excellent in releasability with a semiconductor resin package and hardly causes warpage, wrinkles and the like; and a method of obtaining a semiconductor resin package with good dimensional accuracy using the same. I assume.
- the first of the present invention relates to a release film shown below.
- a pair of outermost layers A including one or more base layers C and the base layer C and containing 4-methyl-1-pentene polymer as a main component, the base layers C, and The mold release film for semiconductor resin package manufacture which has a pair of contact bonding layer B to which it bonds with outermost layer A.
- the base material layer C contains a polyamide resin, and in the adhesive layer B, 4-methyl-1-pentene polymer is modified with unsaturated carboxylic acid and / or acid anhydride of unsaturated carboxylic acid
- the mold release film according to [1] comprising a modified 4-methyl-1-pentene polymer.
- the mold release film according to any one of [1] to [6], wherein the laminated structure of the release film is symmetrical with respect to the base layer C.
- the release film includes a step of disposing a semiconductor chip in the mold, a step of disposing the release film between the semiconductor chip and the inner surface of the mold, and sealing in the mold Material is used to produce a sealed semiconductor chip, and the step of peeling the sealed semiconductor chip from the release film, used in a manufacturing process of a semiconductor resin package, [1] The mold release film as described in any of [7].
- the second of the present invention relates to a method of manufacturing a semiconductor resin package using a release film described below.
- a step of disposing a semiconductor chip in a mold a step of disposing the release film according to any one of [1] to [7] between the semiconductor chip and the inner surface of the mold; the mold
- a method of manufacturing a semiconductor resin package comprising the steps of: obtaining a sealed semiconductor chip by injecting a sealing material therein; and peeling the sealed semiconductor chip from the release film.
- a mold release film which is excellent in mold releasability with a semiconductor resin package and which hardly causes warpage or longitudinal wrinkles.
- the mold release film (mold release film) for semiconductor resin package production of the present invention holds a base material layer C and a base material layer C, and 4-methyl-1 A pair of outermost layers A containing a pentene polymer as a main component, and a pair of adhesive layers B disposed between the base layer C and the outermost layer A;
- the release film of the present invention is disposed on the inner surface of a molding die when the semiconductor chip is resin-sealed inside the molding die.
- the resin-sealed semiconductor chip semiconductor resin package
- the pair of outermost layers A is the outermost layer disposed on both sides of the release film.
- One outermost layer A is in contact with the semiconductor resin package (molded product); the other outermost layer A is in contact with the inside of the mold. Therefore, the outermost layer A is required to be excellent in heat resistance and releasability.
- the outermost layer A contains a 4-methyl-1-pentene polymer as a main component.
- the 4-methyl-1-pentene polymer has a high melting point of 220 to 240 ° C. and not only does not melt at the mold temperature in the manufacturing process of the semiconductor resin package, but it is excellent in releasability because of low surface energy.
- the symbol “to” includes the range of its both ends, and the same applies to the following.
- the 4-methyl-1-pentene polymer is a 4-methyl-1-pentene homopolymer (4-methyl-1-pentene homopolymer) or 4-methyl-1-pentene and 4-methyl-1-pentene. Copolymer with other monomers other than -1-pentene (4-methyl-1-pentene copolymer).
- Examples of other monomers in the 4-methyl-1-pentene copolymer include ⁇ -olefins of 2 to 20 carbon atoms.
- Examples of ⁇ -olefins having 2 to 20 carbon atoms include ethylene, propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-tetradecene, 1-hexadecene, 1-heptadecene , 1-octadecene, and 1-eikosen and the like. These ⁇ -olefins may be used alone or in combination of two or more.
- ⁇ -olefins having 2 to 20 carbon atoms ⁇ -olefins having 7 to 20 carbon atoms are preferable, ⁇ -olefins having 8 to 20 carbon atoms are more preferable, and ⁇ -olefins having 10 to 20 carbon atoms are preferable. Is more preferred.
- the content of the repeating unit derived from 4-methyl-1-pentene in the 4-methyl-1-pentene copolymer is preferably 93% by mass or more, more preferably 93 to 99% by mass, and still more preferably 95 to 98% by mass .
- Such 4-methyl-1-pentene copolymer has good rigidity derived from 4-methyl-1-pentene and good formability derived from ⁇ -olefin.
- the melt flow rate (MFR) of the 4-methyl-1-pentene polymer measured at a temperature of 260 ° C. under a load of 5.0 kg according to ASTM D1238 is 0.5 to 250 g / 10 min. Preferably, it is 1.0 to 150 g / 1.
- MFR of the 4-methyl-1-pentene polymer is in the above range, the moldability and mechanical properties are excellent.
- the 4-methyl-1-pentene polymer can be produced by any method. For example, it can be obtained by polymerizing 4-methyl-1-pentene in the presence of a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst.
- the 4-methyl-1-pentene polymer used in the present invention may be one produced as described above; it may be a commercially available product.
- Commercially available examples of 4-methyl-1-pentene polymers include TPX manufactured by Mitsui Chemicals, Inc., and the like.
- the 4-methyl-1-pentene polymer preferably has crystallinity. Specifically, the 4-methyl-1-pentene polymer preferably has an isotactic structure or a syndiotactic structure; in particular, it preferably has an isotactic structure.
- the molecular weight of the 4-methyl-1-pentene polymer is not particularly limited as long as the formability and mechanical properties are satisfied.
- the outermost layer A may contain another resin other than the 4-methyl-1-pentene polymer as long as the object of the present invention is not impaired.
- the outermost layer A may contain an additive as long as the object of the present invention is not impaired.
- the additives include known additives usually blended in polyolefins such as heat stabilizers, weather stabilizers, rust inhibitors, copper damage stabilizers, antistatic agents and the like.
- the additive amount of the additive is preferably 0.0001 to 10 parts by mass with respect to 100 parts by mass of the 4-methyl-1-pentene copolymer resin.
- the base layer C is an intermediate layer of the release film and has a function as a film base. For this reason, it is preferable that the base material layer C is excellent in heat resistance and mechanical characteristics. In particular, it is preferable that the resin which is the main component of the base layer C be superior to the 4-methyl-1-pentene-based polymer which is the main component of the outermost layer A at high temperature strength and creep resistance.
- the high temperature here means the mold temperature at the time of manufacturing a semiconductor resin package.
- Such resins include polycarbonate resins, polyester resins and polyamide resins. Among them, polyamide resins are preferable, and aliphatic polyamide resins are more preferable. These polyamide resins have higher adhesion to the modified 4-methyl-1-pentene polymer contained in the adhesive layer B described later than polyester resins such as polyethylene terephthalate resin, and therefore, the outermost layer A and the group A Delamination with the material layer C can be effectively suppressed.
- Aliphatic polyamide resin is a resin obtained by ring-opening polymerization of lactam; polycondensation reaction of aliphatic diamine component and aliphatic dicarboxylic acid component; or polycondensation of aliphatic aminocarboxylic acid.
- Examples of aliphatic polyamides obtained by ring-opening polymerization of lactams include polyamide 6, polyamide 11, polyamide 12 and polyamide 612.
- Examples of the aliphatic polyamide obtained by the polycondensation of the aliphatic diamine component and the aliphatic dicarboxylic acid component include polyamide 66, polyamide 610, polyamide 46, polyamide MXD6, polyamide 6T, polyamide 6I and polyamide 9T.
- polyamide 6 or polyamide 66 is preferable; polyamide 66 is more preferable.
- These polyamides (especially polyamide 66) have high melting points and high elastic modulus, and are excellent not only in heat resistance and mechanical properties but also in adhesion to an adhesive layer B described later.
- the release film having the base material layer C containing these polyamides is not only difficult to produce wrinkles in the mold, but also hard to produce pinhole-like tears. If the sealing material leaks through a pinhole-like break, a part of the sealing material component adheres and deposits on the inner wall of the mold cavity, which is not preferable because the mold is contaminated in a short time.
- the melting point of the aliphatic polyamide measured by the DSC method is preferably 190 ° C. or higher. It is because heat resistance is inadequate and the base film C contains the aliphatic polyamide which has melting
- the base layer C may be a multilayer, or may be a three-layer as shown by "C / C '/ C". In that case, it is preferable that at least one of the base material layer C and the base material layer C ′ contain the polyamide 66.
- the base layer C may further contain another resin other than the above-described polyamide resin and the like.
- Preferred examples of other resins are heat-resistant elastomers that are superior in creep resistance to tensile stress and compressive stress at high temperature than 4-methyl-1-pentene polymer that is the main component of the outermost layer A; or stress It is a heat resistant elastomer which is hard to relax and is excellent in elastic recovery.
- thermoplastic polyamide-based elastomers examples include thermoplastic polyamide-based elastomers, thermoplastic polyester-based elastomers and the like, in consideration of adhesion to the adhesive layer B.
- the melting point of these thermoplastic elastomers measured by the DSC method is preferably 190 ° C. or higher. Even if the melting point of the thermoplastic elastomer is less than 190 ° C., it can be chemically crosslinked using a crosslinking agent or a crosslinking aid, or physically crosslinked by ultraviolet light, electron beam, gamma ray, etc. Creep resistance and elastic recovery at high temperatures may be improved.
- thermoplastic polyamide-based elastomers include block copolymers in which polyamide is a hard segment and polyester or polyether is a soft segment.
- polyamides constituting the hard segment include polyamide 6, polyamide 66, polyamide 610, polyamide 612, polyamide 11, and the like.
- polyethers constituting the soft segment include polyethylene glycol (PEG), polypropylene glycol (PPG), polytetramethylene glycol (PTMG) and the like.
- thermoplastic polyester-based elastomer a crystalline polymer segment consisting of a crystalline aromatic polyester unit is made a hard segment, and an amorphous polymer segment consisting of a polyether unit or an aliphatic polyester unit is made a soft segment Block copolymers are included.
- the crystalline polymer composed of the crystalline aromatic polyester unit constituting the hard segment include polybutylene terephthalate (PBT), polybutylene naphthalate (PBN) and the like.
- PBT polybutylene terephthalate
- PBN polybutylene naphthalate
- amorphous polymer consisting of polyether units constituting the soft segment include polytetramethylene ether glycol (PTMG) and the like.
- amorphous polymers consisting of aliphatic polyester units constituting the soft segment include aliphatic polyesters such as polycaprolactone (PCL).
- PCL polycaprolactone
- specific examples of the thermoplastic polyester-based elastomer include block copolymers of polybutylene terephthalate (PBT) and polytetramethylene ether glycol (PTMG); block copolymers of polybutylene terephthalate (PBT) and polycaprolactone (PCL) Included are block copolymers of polybutylene naphthalate (PBN) and aliphatic polyester, and the like.
- the base layer C may contain known additives as long as the object of the present invention is not impaired.
- the additive include a heat stabilizer including a copper compound system for the purpose of improving heat aging resistance; lubricants such as calcium stearate and aluminum stearate; It contains known additives which are usually blended into polyamide resins.
- the adhesive layer B is disposed between the base layer C and each of the pair of outermost layers A, and has a function of adhering them. By arranging the adhesive layer B, it is possible to suppress the delamination between the base layer C and the outermost layer A at a portion where stress concentration is likely to be generated in the mold release film in the mold at the time of mold clamping or injection molding. .
- the location where stress concentration is likely to occur is, for example, the peripheral portion of the cavity of the mold (the boundary between the cavity surface and the parting surface of the mold).
- the adhesive layer B preferably contains a material compatible with both the outermost layer A and the base layer C.
- the adhesive layer B is a 4-methyl-1-pentene polymer, which is the main component of the outermost layer A, modified to be compatible with the base layer C; specifically, modified to have a polar group It is preferable to include the above-described 4-methyl-1-pentene polymer.
- the base layer C preferably contains a polyamide resin, and the polyamide resin is compatible with polar groups.
- the 4-methyl-1-pentene polymer modified to have a polar group can be obtained by any method. Among them, it is preferable to modify the 4-methyl-1-pentene polymer with an unsaturated carboxylic acid and / or its acid anhydride (hereinafter also referred to as “unsaturated carboxylic acid etc.”).
- graft polymerization of 4-methyl-1-pentene polymer and unsaturated carboxylic acid etc can be carried out by a known method, for example, 4-methyl-1-pentene polymer and unsaturated carboxylic acid or the like. , And may be melt-kneaded in the presence of a peroxide or the like.
- the intrinsic viscosity [ ⁇ ] of the 4-methyl-1-pentene polymer before modification is preferably 0.5 to 25 dl / g, and more preferably 0.5 to 5 dl / g Is more preferred.
- unsaturated carboxylic acid and the like examples include unsaturated compounds having 3 to 20 carbon atoms and having a carboxyl group and an unsaturated group; and unsaturated compounds having 3 to 20 carbon atoms and having a carboxylic acid anhydride group and an unsaturated group. Is included.
- unsaturated groups include vinyl, vinylene and unsaturated cyclic hydrocarbon groups.
- unsaturated carboxylic acid and the like include unsaturated monocarboxylic acids such as acrylic acid and methacrylic acid; maleic acid, fumaric acid, itaconic acid, citraconic acid, allyl succinic acid, mesaconic acid, glutaconic acid, nadic acid TM Unsaturated dicarboxylic acids such as methyl nadic acid, tetrahydrophthalic acid and methyl hexahydrophthalic acid; and maleic anhydride, itaconic anhydride, citraconic anhydride, allylsuccinic anhydride, allyl succinic anhydride, glutaconic anhydride, nadic anhydride TM, methyl nadic anhydride Included are unsaturated dicarboxylic acid anhydrides such as acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride and the like. You may use these individually or in combination of 2 or more types.
- the grafting ratio of the modified 4-methyl-1-pentene polymer (hereinafter also referred to as “modified 4-methyl-1-pentene polymer”) is preferably 20% by mass or less, preferably 0.1 to The content is more preferably 5% by mass, further preferably 0.5 to 2% by mass.
- modified 4-methyl-1-pentene polymer having a graft ratio in the above range has good adhesion to both the outermost layer A and the base layer C.
- the modified 4-methyl-1-pentene polymer preferably has substantially no crosslinked structure.
- the absence of the crosslinked structure can be confirmed by dissolving the modified 4-methyl-1-pentene polymer in an organic solvent such as p-xylene, for example, and the absence of a gel-like substance.
- the intrinsic viscosity [ ⁇ ] of the modified 4-methyl-1-pentene polymer measured in decahydronaphthalene at 135 ° C. is preferably 0.2 to 10 dl / g, and more preferably 0.5 to 5 dl / g. It is more preferable that it is g.
- the adhesive layer B may have only the modified 4-methyl-1-pentene polymer as a main component, but preferably a mixture of the modified 4-methyl-1-pentene polymer and another ⁇ -olefin polymer Main component
- the modified 4-methyl-1-pentene polymer is preferably contained in an amount of 20 to 40% by mass in the mixture.
- the ⁇ -olefin polymer is preferably an ⁇ -olefin polymer having 2 to 20 carbon atoms.
- ⁇ -olefin polymers having 2 to 20 carbon atoms include polymers such as ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-tetradecene, 1-octadecene and the like Be Among these, 1-butene polymers are preferable.
- the 1-butene polymer is a homopolymer of 1-butene or a copolymer of 1-butene and an ⁇ -olefin having 2 to 20 carbon atoms other than 1-butene.
- Examples of the ⁇ -olefin having 2 to 20 carbon atoms other than 1-butene include ethylene, propylene, 1-hexene, 1-octene, 1-decene, 1-tetradecene, 1-octadecene and the like; Ethylene or propylene.
- the 1-butene polymer preferably contains 60% by mass or more, and more preferably 80% by mass or more of repeating units derived from 1-butene. Such a 1-butene polymer is because it is excellent in the mixing property (or compatibility) with the modified 4-methyl-1-pentene polymer.
- the melt flow rate (MFR) of the 1-butene polymer measured at a temperature of 190 ° C. under a load of 2.16 kg according to ASTM D 1238 is preferably 0.01 to 100 g / 10 min. More preferably, it is 1 to 50 g / 10 min.
- the 1-butene polymer having an MFR in the above range is excellent in the miscibility (or compatibility) with the modified 4-methyl-1-pentene polymer, and can improve the adhesion of the adhesive layer B.
- the adhesive layer B may also contain the above-described additive in addition to the main component.
- the release film of the present invention is disposed between the base material layer C, the pair of outermost layers A sandwiching the base material layer C, and each of the base material layer C and the pair of outermost layers A And a pair of adhesive layers B. That is, the release film of the present invention preferably has a laminated structure symmetrical to the central layer. This is because a film having a symmetrical laminated structure is difficult to be deformed (warped etc.) due to a thermal expansion difference, moisture absorption or the like when it is loaded into a mold and heated.
- the release film may include other layers other than the base material layer C, the outermost layer A, and the adhesive layer B, as needed, as long as it has a laminated structure symmetrical to the central layer.
- the base layer C may be a single layer; or may be a multilayer of two or more layers.
- a plurality of base layers may be directly laminated; another layer (for example, an adhesive layer) may be disposed between the base layer and the base layer.
- a / B / C / B / A A / B / C / C / C '/ C / B / A
- FIG. 1 is a schematic view showing a preferred configuration example of the release film of the present invention.
- the release film 10 includes a base material layer 12, a pair of outermost layers 14 sandwiching the base material layer 12, and a pair of the release film 10 disposed between the base material layer 12 and the outermost layer 14. And an adhesive layer 13.
- the base layer 12 is the base layer C; the outermost layer 14 is the outermost layer A; and the adhesive layer 13 is the adhesive layer B.
- the thickness of a pair of layers (layers made of the same material) disposed at symmetrical positions with respect to the central layer such as a pair of outermost layers A, a pair of adhesive layers B, etc. It is preferable because the amount of deformation due to the thermal expansion coefficient and the like can be mutually canceled to suppress the warpage.
- the total thickness of the release film is preferably 15 to 100 ⁇ m.
- the thickness of each layer may be adjusted so that the total thickness of the release film is in the above range.
- the outermost layer A is preferably 1 to 30 ⁇ m
- the adhesive layer B is preferably 1 to 20 ⁇ m
- the base layer C is preferably 20 to 40 ⁇ m.
- the release film of the present invention has the base layer C having a high elastic modulus and a high melting point; on the other hand, the outermost layer A and the base are selected to suppress the delamination between the outermost layer A and the base layer C. There is an adhesive layer B between layers C.
- the wrinkles (side wrinkles) generated on the side surface of the semiconductor resin package are considered to be generated by the following mechanism. That is, when the upper and lower molds are clamped in a state in which the mold release film is disposed in the mold, the mold release film disposed between the semiconductor chip substrate and the inner surface of the mold is crushed by the clamping pressure. A portion of the release film portion which has been crushed and becomes surplus is released in such a manner as to escape toward the inside of the mold cavity; that is, the vicinity of the substrate of the semiconductor chip on the inner surface of the mold facing the side portion of the semiconductor resin package. As a result, a dent is generated on the side surface of the semiconductor resin package that faces the portion where the surplus release film has run out.
- the recess on the side surface of the semiconductor resin package has a wrinkled pattern in appearance.
- Such side surface wrinkles may also occur in a package obtained by singulating a plurality of semiconductor chips at once after molding them together; for example, like QFN (Quad Flat Non-leaded package).
- QFN Quad Flat Non-leaded package
- the side portion in a sealed state directly constitutes the outer shape of the product, the appearance is particularly likely to be poor.
- the concave portion which appears as wrinkles in appearance is that the mold release film surplus in the mold bites into the side surface of the semiconductor resin package immediately before mold release (mold opening). For this reason, when releasing the semiconductor resin package, the surplus release film portion may not be separated while biting into the side surface of the semiconductor resin package, and may not be peeled off.
- the molding conditions such as reducing the clamping force.
- reducing the total thickness of the release film to the extent that longitudinal wrinkles, burrs and tears do not occur; particularly the outermost layer A and adhesion It is preferable to reduce the total thickness of the layer B within the range that does not impair the releasability and the interlayer adhesion.
- the total thickness of the outermost layer A and the adhesive layer B is the total thickness of the pair of outermost layers A and the pair of adhesive layers B, preferably 12 to 32 ⁇ m.
- the thickness of each outermost layer A is preferably 4 to 10 ⁇ m, and the thickness of each adhesive layer B is preferably 2 to 6 ⁇ m.
- the release film of the present invention preferably has a tensile modulus of 60 MPa or more at a mold temperature, and a tensile strength (strength at a point of 500% elongation) at a mold temperature of 5 MPa or more.
- the tensile elastic modulus at 175 ° C. is 60 MPa or more to 300 MPa
- the tensile strength (the strength at a point where the elongation is 500% with respect to the initial distance between chucks) is 5 MPa or more.
- Tensile modulus and tensile strength can be measured according to the following method.
- Tensile strength As a test piece, a short strip cut out of a release film with a width of 15 mm is prepared. At this time, the longitudinal direction of the strip is made parallel to the film winding direction. The test specimen is held by a tensile tester with a thermostat adjusted to the same temperature as the mold temperature so that the distance between the chucks is 50 mm. The test piece is pulled at a tensile speed of 200 mm / minute (constant), and the stress at which the elongation relative to the initial chuck distance (50 mm) is 500% (chuck distance 300 mm) without breakage is taken as the tensile strength.
- the release film of the present invention can be produced by a known method.
- the release film can be obtained by a method of co-extruding the resin constituting each layer; or a method of laminating a film-like body of each layer by lamination; Furthermore, if necessary, fine irregularities such as a textured surface by an embossing roll may be formed on one side or both sides of the release film.
- Method of Manufacturing Semiconductor Resin Package In the method of manufacturing a semiconductor resin package of the present invention, a first step of arranging a mold release film between a semiconductor chip arranged in a mold and the inner surface of the mold; sealing the semiconductor chip A second step of sealing with a material; and a third step of peeling the sealed semiconductor chip from the release film.
- the semiconductor chip is a chip on which a semiconductor integrated circuit is formed.
- a semiconductor chip is usually used by being fixed to a lead frame or a substrate called a mother board or the like.
- the semiconductor chip used in the present invention is preferably a known semiconductor chip fixed to a lead frame or a substrate by a known method.
- a mold is a mold for molding used to obtain a desired semiconductor resin package.
- the shape of the mold may be a known shape, and the material of the mold may also be a known material.
- the sealing material is a resin composition for sealing a semiconductor chip.
- the sealing material may be a known one, but is preferably one containing a thermosetting resin such as an epoxy resin as a main component.
- FIG. 2 is a view showing an example of a first step in the manufacturing process of the semiconductor resin package.
- 10 is a release film
- 24a is a film unwinding device
- 24b is a film winding device
- 20 is an upper mold of the mold
- 21 is a lower mold of the mold
- 22 is a cavity
- 30 is a transfer molding machine.
- a plunger, 40 is a semiconductor chip
- 41 is a substrate
- 42 is a wiring
- 50 is a sealing material.
- the release film 10 is placed between the upper mold 20 and the lower mold 21 of the open mold. At this time, a constant tension is applied to the release film 10 by the film unwinding device 24 a and the film winding device 24 b.
- the tension applied to the release film 10 is preferably 0.2 to 2 MPa in terms of tensile stress.
- the tension is lower than 0.2 MPa (in terms of tensile stress)
- the release film 10 is easily slackened and wrinkles are easily generated in the width direction of the release film 10.
- the tension applied to the mold release film 10 exceeds 2 MPa (tensile stress conversion)
- the mold release film 10 can not be vacuum adsorbed smoothly on the inner surface of the mold, and the mold following property may be lowered. .
- the cavity surface is a surface that constitutes the cavity 22 of the upper mold 20.
- the parting surface is a surface in which the upper mold 20 and the lower mold 21 are in contact with each other when the upper mold 20 and the lower mold 21 are closed.
- the molding conditions may be adjusted, for example, by reducing the mold clamping force within a range where the burrs do not cause a problem.
- the temperature of the mold is not particularly limited as long as the thermosetting sealant can be cured.
- the temperature of the mold is preferably 160 to 200 ° C., and more preferably 170 to 180 ° C., when the main component of the sealing material is an epoxy resin.
- the depth from the parting surface of the mold to the deepest portion of the cavity 22 depends on the size of the semiconductor chip 40, but is about 0.2 to 2 mm, preferably 0.3 to 1 mm.
- the release film 10 may be placed in the position shown in FIG. 2a after being preheated.
- the sealing material 50 may also be preheated.
- the semiconductor chip 40 fixed to the substrate 41 is disposed on the lower mold 21, but the order may be reversed.
- FIG. 3 is a view showing an example of a second step in the manufacturing process of the semiconductor resin package. The symbols in FIG. 3 are defined in the same manner as in FIG.
- the sealing material 50 which has a temperature equal to or higher than the softening point due to heat conduction from the mold and is liquefied is injected into the cavity 22 by raising the plunger 30.
- the plunger 30 is held at a predetermined pressure for a predetermined time while the plunger 30 is raised, and the sealing material 50 is cured.
- the holding pressure is preferably, for example, 1 to 12 MPa.
- FIG. 4 is a view showing an example of a third step in the manufacturing process of the semiconductor resin package.
- reference numeral 60 denotes a sealed semiconductor chip
- reference numeral 61 denotes a semiconductor resin package
- reference numeral 62 denotes a runner. Other symbols are defined as in FIG.
- the upper die 20 and the lower die 21 are opened, and the release film 10 is released from the sealed semiconductor chip 60.
- the release film 10 is easily released from the sealed semiconductor chip 60 because of excellent release properties.
- the release film 10 can be easily released from the upper mold 20 of the mold.
- the runner 62 is separated from the sealed semiconductor chip 60 to form the semiconductor resin package 61.
- FIG. 5 is a view showing an example of a process of repositioning a new release film in the mold after the third process. The symbols in FIG. 5 are also defined in the same manner as in FIG.
- a new release film 10 is formed by the film unwinding device 24a (the upper mold 20 and the lower mold 21 ), The new release film 10 can be repositioned.
- the semiconductor resin package is manufactured by transfer molding
- the semiconductor resin package can also be manufactured by compression molding, injection molding, or the like.
- the separation disclosed in the document (“Special Issue on Forming Technology of Electronic Component Package", Forming, Volume 20, No. 5, 2008, pp. 276 to 287)
- the release film of the present invention may be used.
- the release film 10 of the present invention has a laminated structure symmetrical to the central layer. For this reason, it is hard to produce a deformation
- the base material layer C (intermediate layer) of the release film 10 contains an aliphatic polyamide excellent in strength at high temperature as a main component, longitudinal wrinkles at the mold temperature are also less likely to occur.
- the ratio of the total thickness of the outermost layer A and the adhesive layer B to the total thickness of the release film is set at a certain value or less, it is possible to suppress wrinkles (side wrinkles) generated on the side surface of the semiconductor resin package.
- the mold release film 10 of the present invention has good mold followability and good mold release property, the resin in the mold can be stably flowed even if the sealing step is continuously performed.
- the release film 10 of the present invention can stably maintain high releasability with respect to the sealed semiconductor chip 40. Therefore, it is possible to obtain a semiconductor resin package which has good dimensional accuracy and is less in appearance defects such as burrs and dents.
- a copolymer of 4-methyl-1-pentene and 1-decene was produced by a conventional method.
- the 1-decene content was 2.5% by mass.
- This copolymer is hereinafter also referred to as "A-1".
- Preparation of material for adhesive layer B 25 parts by mass of modified 4-methyl-1-pentene copolymer obtained in the previous step, 50 parts by mass of 4-methyl-1-pentene and dialene 168 (manufactured by Mitsubishi Chemical Corporation, carbon Copolymer of (16 and 18 ⁇ -olefins) (direne 168 content 6.5% by mass), 25 parts by mass of 1-butene copolymer, 0.10 parts by mass of Irganox 1010 as a stabilizer (Irganox 1010) (manufactured by Ciba, Ltd.) and 0.03 parts by mass of calcium stearate (manufactured by Sankyo Kaisha, Ltd.) were mixed by low-speed rotation for 3 minutes using a Henschel mixer. Next, this mixture was extruded at 280 ° C. using a twin-screw extruder to obtain a resin for adhesive layer B (hereinafter also referred to as “B-1”).
- B-1 a resin for adhesive layer B
- a first aliphatic polyamide resin (also referred to as “C-1”), polyamide 6 (made by Toray, trade name Amilan CM1041 LO, melting point 225 ° C.) was prepared.
- a second aliphatic polyamide resin (also referred to as “C-2”), polyamide 66 (manufactured by Asahi Kasei Chemicals, trade name Leona 1700 S, melting point 265 ° C.) was prepared.
- a third aliphatic polyamide resin (also referred to as “C-3”), polyamide 66 (made by DuPont, trade name: Zytel 42A, melting point 262 ° C.) was prepared.
- Example 1 By using the T-die molding machine as a raw material and co-extrusion of the above-described materials for each layer, an unstretched release film having a width of 400 mm was produced.
- the release film has a structure of A-1 / B-1 / C-1 / B-1 / A-1 in three types and five layers, and the thickness of each layer is 15/5/25/5/15 ⁇ m (total The thickness was 65 ⁇ m).
- the obtained release film 10 was placed between the upper mold 20 and the lower mold 21.
- the depth of the deepest part from the mold parting surface of the cavity 22 in the upper mold 20 and the lower mold 21 is 0.8 mm.
- the tension applied to the release film 10 by the film unwinding device 24a and the film winding device 24b was adjusted so that the tensile stress was 1 MPa.
- the release film 10 was vacuum-adsorbed to the parting surface of the upper mold 20.
- the semiconductor chip 40 fixed to the substrate 41 was placed on the lower mold 21 (FIG. 2c), and clamping was performed (FIG. 2d).
- the mold temperature at this time was 175 ° C.
- a commercially available epoxy resin molding material for semiconductor encapsulation was used as the encapsulant 50.
- the sealing material 50 having a temperature equal to or higher than the softening point due to heat conduction from the mold was injected through the plunger 30.
- the sealing material 50 was cured by holding the pressure at 12 MPa for 120 seconds.
- the release film 10 was released from the sealed semiconductor chip 60 to obtain a semiconductor resin package 61.
- the obtained semiconductor resin package 61 and the release film 10 after sealing were evaluated by the following method.
- FIG. 6 is a cross-sectional view showing an example of a method of measuring the depth of side creases of the semiconductor package 61. As shown in FIG. That is, a cross section perpendicular to the top surface of the semiconductor resin package 61 was cut out with a dicer. Thereby, the cross section of the semiconductor resin package 61 as shown in FIG. 6 was obtained.
- the depth of side wrinkles is less than 100 ⁇ m ⁇ : The depth of side wrinkles is 100 ⁇ m to less than 200 ⁇ m ⁇ : The depth of side wrinkles is 200 ⁇ m to less than 300 ⁇ m ⁇ : The depth of side wrinkles is 300 ⁇ m or more If the size is large, not only appearance defects of the semiconductor resin package 61 become noticeable, but also the semiconductor resin package 61 is not smoothly peeled off from the release film 10 at the time of release, and release defects easily occur. For this reason, the smaller the depth of the side wrinkles, the better.
- Warpage The state of warpage of the release film was evaluated according to the following criteria. ⁇ : None at all :: Slightly warped but no problem in practical use ⁇ : Warp is too large to use
- Example 2 A release film 10 was prepared in the same manner as in Example 1 except that the thickness of each layer was 10/5/15/5/10 ⁇ m (total thickness 45 ⁇ m). A semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 3 A release film 10 was prepared in the same manner as in Example 1 except that the thickness of each layer was 10/5/20/5/10 ⁇ m (total thickness 50 ⁇ m). A semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 4 A release film 10 was prepared in the same manner as in Example 11 except that the thickness of each layer was changed to 10/3/24/3/10 ⁇ m (total thickness 50 ⁇ m). A semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 5 A release film 10 was prepared in the same manner as in Example 1 except that the material of the base layer C was changed to C-2.
- a semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 6 A release film 10 was prepared in the same manner as in Example 2 except that the material of the base layer C was changed to C-2.
- a semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 7 A release film 10 was prepared in the same manner as in Example 3 except that the material of the base layer C was changed to C-2.
- a semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 8 A release film 10 was prepared in the same manner as in Example 4 except that the material of the base layer C was changed to C-2.
- a semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 9 The release film 10 was formed in the same manner as in Example 1 except that the material C-1 of the base layer C was C-2 and the thickness of each layer was 6/3/32/3/6 ⁇ m (total thickness 50 ⁇ m). Got ready. A semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 10 A release film 10 was prepared in the same manner as in Example 3 except that the material of the base layer C was changed to C-3. A semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 11 A release film 10 was prepared in the same manner as in Example 4 except that the material of the base layer C was changed to C-3.
- a semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- Example 12 A release film 10 was prepared in the same manner as in Example 9 except that the material of the base layer C was changed to C-3.
- a semiconductor resin package 61 was manufactured and evaluated in the same manner as in Example 1 using this release film 10.
- the release film has a structure of A-1 / C-1 / A-1 as a two-kind three-layer structure that does not include the adhesive layer B, and the thickness of each layer is 25/15/25 ⁇ m (total thickness 65 ⁇ m)
- An unstretched release film having a width of 400 mm was obtained in the same manner as in Example 1 except for the above.
- a semiconductor resin package was manufactured and evaluated in the same manner as in Example 1 using this release film.
- Comparative Example 2 A release film 10 was obtained in the same manner as in Comparative Example 1 except that the thickness of each layer was 15/15/15 ⁇ m (total thickness 45 ⁇ m). A semiconductor resin package was manufactured and evaluated in the same manner as in Example 1 using this release film.
- the release film has a three-layer three-layer structure of A-1 / B-1 / C-2 and an asymmetric laminate structure with respect to the central layer, and the thickness of each layer is 20/5/25 ⁇ m (total thickness 50 ⁇ m)
- An unstretched release film having a width of 400 mm was obtained in the same manner as in Example 1 except that the above was used.
- a semiconductor resin package was manufactured and evaluated in the same manner as in Example 1 using this release film.
- the release films of the present invention of Examples 1 to 12 not only have excellent releasability, but can suppress all of delamination, wrinkles, warpage and tear.
- the release film of Examples 5 to 12 in which the substrate layer C contains polyamide 66 (PA 66); among them, the release films of Examples 6 to 12 in which the thicknesses of the outermost layer A and the adhesive layer B are small are the side surfaces of the semiconductor resin package. It can be seen that the wrinkles are significantly reduced. It is considered that this is because the outermost layer A and the adhesive layer B are thin because the heat resistance of the base layer C is high and the compressive yield stress is relatively low. However, if the base layer C is too thin, slight breakage may occur. It is considered that when the substrate layer C is thin, it is difficult to maintain the strength of the release film itself.
- the release films of Comparative Examples 1 to 3 can not suppress all of delamination, wrinkles, warp and tear.
- the release films of Comparative Examples 1 and 2 which do not have the adhesive layer B are inferior in the releasability, the delamination and the tear; it is understood that the delamination is particularly inferior.
- the release film of Comparative Example 3 having a laminate structure asymmetric with respect to the central layer not only causes warpage but also has extremely low releasability.
- the release film of the present invention is excellent in the releasability with the semiconductor resin package, and hardly causes warpage or wrinkles.
- a semiconductor resin package with high dimensional accuracy can be provided. Therefore, the present invention is useful for the production of a semiconductor resin package.
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Abstract
Description
1)封止材が金型の内面を汚染することがあるため、金型の洗浄が必要となり、作業効率が低下する。
2)金型の内面が損傷されるため、金型寿命が短い。
3)成形された半導体樹脂パッケージにバリが生じやすい。
[1] 一層以上の基材層Cと、前記基材層Cを挟持し、4-メチル-1-ペンテン系重合体を主成分として含む一対の最外層Aと、前記基材層Cと前記最外層Aとを接着させる一対の接着層Bとを有する、半導体樹脂パッケージ製造用金型離型フィルム。
[2] 前記基材層Cは、ポリアミド樹脂を含み、前記接着層Bは、4-メチル-1-ペンテン系重合体が不飽和カルボン酸および/または不飽和カルボン酸の酸無水物により変性された変性4-メチル-1-ペンテン系重合体を含む、[1]記載の金型離型フィルム。
[3] 前記接着層Bは、4-メチル-1-ペンテン系重合体が無水マレイン酸によりグラフト変性された変性4-メチル-1-ペンテン系重合体を含む、[1]または[2]記載の金型離型フィルム。
[4] 前記ポリアミド樹脂は、ポリアミド6またはポリアミド66である、[2]または[3]記載の金型離型フィルム。
[5] 前記基材層Cは一層である、[1]~[4]のいずれかに記載の金型離型フィルム。
[6] 前記一対の最外層Aと前記一対の接着層Bの合計厚みは、32μm以下である、[1]~[5]のいずれかに記載の金型離型フィルム。
[7] 前記離型フィルムの積層構造は、前記基材層Cに対して対称である、[1]~[6]のいずれかに記載の金型離型フィルム。
[8] 前記離型フィルムは、前記金型内に半導体チップを配置する工程、前記半導体チップと前記金型内面との間に、前記離型フィルムを配置する工程、前記金型内に封止材を注入することにより、封止された半導体チップを得る工程、前記封止された半導体チップを前記離型フィルムから剥離する工程、を含む半導体樹脂パッケージの製造工程に用いられる、[1]~[7]のいずれかに記載の金型離型フィルム。
[9] 金型内に半導体チップを配置する工程;半導体チップと前記金型内面との間に、[1]~[7]のいずれかに記載の離型フィルムを配置する工程;前記金型内に封止材を注入することにより、封止された半導体チップを得る工程;および前記封止された半導体チップを前記離型フィルムから剥離する工程、を含む半導体樹脂パッケージの製造方法。
本発明の半導体樹脂パッケージ製造用金型離型フィルム(離型フィルム)は、基材層Cと、基材層Cを挟持し、かつ4-メチル-1-ペンテン系重合体を主成分として含む一対の最外層Aと、基材層Cと最外層Aとの間に配置される一対の接着層Bと、を含む。
A/B/C/B/A
A/B/C/C’/C/B/A
A/B/C/D/C’/D/C/B/A
試験片として、離型フィルムから幅15mmで切り出した短冊片を準備する。このとき短冊の長手方向が、フィルムの巻取方向と平行になるようにする。金型温度と同じ温度に調整した恒温槽つきの引張試験機に、チャック間距離が50mmとなるように前記試験片を把持させる。試験片を引張速度200mm/分(一定)にて引っ張り、破断することなく初期チャック間距離(50mm)に対する伸びが500%(チャック間距離300mm)となるときの応力を引張強度とする。
前記引張試験から得られた引張応力-ひずみ曲線における、初期の直線部分の傾きから、JIS-K 7113 に準拠して引張弾性率を求める。
本発明の半導体樹脂パッケージの製造方法は、金型内に配置された半導体チップと金型内面との間に離型フィルムを配置する第1の工程;半導体チップを封止材で封止する第2の工程;および封止された半導体チップを離型フィルムから剥離する第3の工程;を含む。
4-メチル-1-ペンテンと1-デセンとの共重合体を、定法により製造した。1-デセン含量は2.5質量%とした。この共重合体を、以下「A-1」ともいう。
変性4-メチル-1-ペンテン共重合体の製造
4-メチル-1-ペンテンとダイアレン168(三菱化学製、炭素数16と18のα-オレフィンの混合物)との共重合体(ダイアレン168の含量量は6.5質量%)を定法により準備した。
前工程で得られた、25質量部の変性4-メチル-1-ペンテン共重合体、50質量部の4-メチル-1-ペンテンとダイアレン168(三菱化学製、炭素数16と18のα-オレフィンの混合物)との共重合体(ダイアレン168含量6.5質量%)、25質量部の1-ブテン共重合体、安定剤として0.10質量部のイルガノックス1010(Irganox1010)(Ciba(株)製)、および0.03質量部のステアリン酸カルシウム(三共有機合成(株)製)を、ヘンシェルミキサーにより、3分間、低速回転して混合した。次いで、この混合物を、二軸押出機を用いて280℃で押出しすることにより、接着層B用樹脂(以下「B-1」ともいう)を得た。
第1の脂肪族ポリアミド樹脂(「C-1」ともいう)として、ポリアミド6(東レ製、商品名アミランCM1041LO、融点225℃)を準備した。
第2の脂肪族ポリアミド樹脂(「C-2」ともいう)として、ポリアミド66(旭化成ケミカルズ製、商品名レオナ1700S、融点265℃)を準備した。
第3の脂肪族ポリアミド樹脂(「C-3」ともいう)として、ポリアミド66(デュポン製、商品名ザイテル42A、融点262℃)を準備した。
前述の各層用材料を原料として、Tダイ成形機を用いて共押出することにより、未延伸の幅400mmの離型フィルムを製造した。離型フィルムの構造を、A-1/B-1/C-1/B-1/A-1の3種5層構造とし、かつ各層の厚みを15/5/25/5/15μm(総厚み65μm)とした。
離型フィルムの半導体樹脂パッケージからの離型性を、以下の基準で評価した。
○:離型フィルムが、金型開放と同時に自然に剥がれる
△:離型フィルムの一部が、半導体樹脂パッケージ61または金型に残る
×:離型フィルムが、封止された半導体チップまたは金型に密着する
離型時の離型フィルムの半導体樹脂パッケージに対応する部分における層間剥離の発生状態を、以下の基準で評価した。
○:最外層Aと基材層Cとの間で、層間剥離なし
△:最外層Aと基材層Cとの間で、わずかに層間剥離あり
×:最外層Aと基材層Cとの間で、顕著な層間剥離あり
半導体樹脂パッケージ上面のシワの状態を目視にて以下の基準で評価した。
○:全くなし
×:パッケージ上面にシワの転写あり
半導体樹脂パッケージ61の側面(エアベント部およびゲート部を除く)に発生したシワの状態を、以下の方法により評価した。
図6は、半導体パッケージ61の側面シワの深さの測定方法の例を示す断面図である。すなわち、半導体樹脂パッケージ61の上面に対して垂直な断面をダイサーで切り出した。これにより、図6に示されるような半導体樹脂パッケージ61の断面を得た。次いで、読み取り顕微鏡で観察することにより、得られた断面において、側面シワがないことを想定した場合の半導体樹脂パッケージの側面(仮想側面)が基板41と交わる基準位置(線)とした。そして、半導体樹脂パッケージの側面の凹み部分の、基準位置(線)からの、基板41面と平行方向の深さdを測定した。このようにして測定された側面シワの深さ値から、側面シワの程度を以下のように規定した。
◎:側面シワの深さが100μm未満
○:側面シワの深さが100μm以上200μm未満
△:側面シワの深さが200μm以上300μm未満
×:側面シワの深さが300μm以上
側面シワの深さが大きいと、半導体樹脂パッケージ61の外観不良が目立ち易くなるだけでなく、離型時に、半導体樹脂パッケージ61が離型フィルム10からスムーズに剥がれず離型不良を生じ易い。このため、側面シワの深さは小さいほど好ましい。
離型フィルムの反りの状態を以下の基準で評価した。
○:全くなし
△:わずかに反るが実用上問題なし
×:反りが大きく使用できない
使用後の離型フィルム10のピンホールの発生状態と金型キャビティ内壁の樹脂付着状態について目視観察をもとに以下の基準で評価した。
○:ピンホール状の破れ無し
△:ピンホール状の破れが僅かにあるが、漏れた封止樹脂の金型への付着なし
各層の厚みを10/5/15/5/10μm(総厚み45μm)とした以外は実施例1と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し、評価した。
各層の厚みを10/5/20/5/10μm(総厚み50μm)とした以外は実施例1と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し、評価した。
各層の厚みを10/3/24/3/10μm(総厚み50μm)とした以外は実施例11と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-2に代えた以外は実施例1と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-2とした以外は実施例2と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-2とした以外は実施例3と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-2とした以外は実施例4と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料C-1をC-2とし、かつ各層の厚みを6/3/32/3/6μm(総厚み50μm)とした以外は実施例1と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-3とした以外は実施例3と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-3とした以外は実施例4と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
基材層Cの材料をC-3とした以外は実施例9と同様にして離型フィルム10を準備した。この離型フィルム10を用いて実施例1と同様にして半導体樹脂パッケージ61を製造し評価した。
離型フィルムの構造を、A-1/C-1/A-1の2種3層構造として、接着層Bを含まない構造とし、かつ各層の厚みは25/15/25μm(総厚み65μm)とした以外は実施例1と同様にして、未延伸の幅400mmの離型フィルムを得た。この離型フィルムを用いて実施例1と同様にして半導体樹脂パッケージを製造し評価した。
各層の厚みを15/15/15μm(総厚み45μm)とした以外は、比較例1と同様にして離型フィルム10を得た。この離型フィルムを用いて実施例1と同様にして半導体樹脂パッケージを製造し評価した。
離型フィルムの構造をA-1/B-1/C-2の3種3層構造として、中心層に対して非対称の積層構造とし、かつ各層の厚みを20/5/25μm(総厚み50μm)とした以外は実施例1と同様にして、未延伸の幅400mmの離型フィルムを得た。この離型フィルム用いて実施例1と同様にして半導体樹脂パッケージを製造し評価した。
基材層Cがポリアミド66(PA66)を含む実施例5~12の離型フィルム;中でも最外層Aと接着層Bの厚みが小さい実施例6~12の離型フィルムは、半導体樹脂パッケージの側面シワが著しく低減されることがわかる。基材層Cの耐熱性が高く、かつ圧縮降伏応力が比較的低い最外層Aと接着層Bが薄いためであると考えられる。ただし、基材層Cが薄すぎると、僅かな破れを生じることもある。基材層Cが薄いと離型フィルム自体の強度を維持しにくいためであると考えられる。
12 基材層C
13 接着層B
14 最外層A
20 金型の上型
21 金型の下型
22 キャビティ
24a フィルム巻き出し装置
24b フィルム巻き取り装置
30 プランジャー
40 半導体チップ
41 基板
42 配線
50 封止材
60 封止された半導体チップ
61 半導体パッケージ
62 ランナー
Claims (9)
- 一層以上の基材層Cと、
前記基材層Cを挟持し、4-メチル-1-ペンテン系重合体を主成分として含む一対の最外層Aと、
前記基材層Cと前記最外層Aとを接着させる一対の接着層Bとを有する、半導体樹脂パッケージ製造用金型離型フィルム。 - 前記基材層Cは、ポリアミド樹脂を含み、
前記接着層Bは、4-メチル-1-ペンテン系重合体が不飽和カルボン酸および/または不飽和カルボン酸の酸無水物により変性された変性4-メチル-1-ペンテン系重合体を含む、請求項1記載の金型離型フィルム。 - 前記接着層Bは、4-メチル-1-ペンテン系重合体が無水マレイン酸によりグラフト変性された変性4-メチル-1-ペンテン系重合体を含む、請求項2記載の金型離型フィルム。
- 前記ポリアミド樹脂は、ポリアミド6またはポリアミド66である、請求項2記載の金型離型フィルム。
- 前記基材層Cは一層である、請求項1記載の金型離型フィルム。
- 前記一対の最外層Aと前記一対の接着層Bの合計厚みは、32μm以下である、請求項1記載の金型離型フィルム。
- 前記離型フィルムの積層構造は、前記基材層Cに対して対称である、請求項1記載の金型離型フィルム。
- 金型内に半導体チップを配置する工程、
前記半導体チップと前記金型内面との間に、請求項1に記載の金型離型フィルムを配置する工程、
前記金型内に封止材を注入することにより、封止された半導体チップを得る工程、および
前記封止された半導体チップを前記離型フィルムから剥離する工程、を含む半導体樹脂パッケージの製造方法。 - 前記金型内に半導体チップを配置する工程、
前記半導体チップと前記金型内面との間に、前記金型離型フィルムを配置する工程、
前記金型内に封止材を注入することにより、封止された半導体チップを得る工程、
前記封止された半導体チップを前記離型フィルムから剥離する工程、を含む半導体樹脂パッケージの製造工程に用いられる、請求項1記載の金型離型フィルム。
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US13/058,411 US20110133362A1 (en) | 2008-08-28 | 2009-08-26 | Mold release film for manufacturing semiconductor resin package and semiconductor resin package manufacturing method using same |
JP2010526550A JP5563981B2 (ja) | 2008-08-28 | 2009-08-26 | 半導体樹脂パッケージ製造用金型離型フィルム、およびそれを用いた半導体樹脂パッケージの製造方法 |
CN200980133166.8A CN102132391B (zh) | 2008-08-28 | 2009-08-26 | 半导体树脂封装制造用模具脱模膜、以及使用其的半导体树脂封装的制造方法 |
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CN102132391B (zh) | 2014-03-19 |
JPWO2010023907A1 (ja) | 2012-01-26 |
US20110133362A1 (en) | 2011-06-09 |
CN102132391A (zh) | 2011-07-20 |
TWI460062B (zh) | 2014-11-11 |
KR20110044243A (ko) | 2011-04-28 |
TW201016426A (en) | 2010-05-01 |
JP5563981B2 (ja) | 2014-07-30 |
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