WO2015122465A1 - 半導体ウェハ表面保護用粘着フィルム、並びに粘着フィルムを用いる半導体ウェハの保護方法及び半導体装置の製造方法 - Google Patents
半導体ウェハ表面保護用粘着フィルム、並びに粘着フィルムを用いる半導体ウェハの保護方法及び半導体装置の製造方法 Download PDFInfo
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- semiconductor wafer
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- adhesive film
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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
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/18—Homopolymers or copolymers of nitriles
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- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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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
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02013—Grinding, lapping
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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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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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
- B32B2405/00—Adhesive articles, e.g. adhesive tapes
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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
- B32B2457/00—Electrical equipment
- B32B2457/14—Semiconductor wafers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- 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
- C09J2407/00—Presence of natural rubber
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- 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
- C09J2421/00—Presence of unspecified rubber
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- 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
- C09J2423/00—Presence of polyolefin
- C09J2423/006—Presence of polyolefin in the substrate
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- 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
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene in the substrate
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- 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
- C09J2433/00—Presence of (meth)acrylic polymer
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- 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
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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- 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
- C09J2483/00—Presence of polysiloxane
Definitions
- the present invention relates to a pressure-sensitive adhesive film for protecting a semiconductor wafer surface, a method for protecting a semiconductor wafer using the pressure-sensitive adhesive film, and a method for manufacturing a semiconductor device. Specifically, in the process of manufacturing a semiconductor integrated circuit, when a semiconductor non-circuit-formed surface (hereinafter referred to as a wafer back surface) is ground to thin the semiconductor wafer, the semiconductor wafer is prevented from being damaged or contaminated.
- a wafer back surface a semiconductor non-circuit-formed surface
- a semiconductor wafer surface protecting pressure-sensitive adhesive film adhered so that a pressure-sensitive adhesive layer is in contact with a circuit forming surface (hereinafter referred to as a wafer surface) of a semiconductor wafer and a method for protecting a semiconductor wafer and a method for manufacturing a semiconductor device using the same About.
- a semiconductor device incorporates an integrated circuit by ion implantation, etching or the like, and further, grinding, wrapping, and wrapping the back surface of the wafer after the integrated circuit is incorporated. It is manufactured by a method of dicing into chips after passing through a back surface grinding process for thinning the wafer by mechanical grinding by means such as polishing. Conventionally, during these processes, when the back surface of a wafer is ground, an adhesive film for protecting the surface of a semiconductor wafer is used in order to prevent damage and contamination of the semiconductor wafer.
- a semiconductor wafer surface protective adhesive film is adhered to the wafer surface via the adhesive layer to protect the wafer surface, and then the wafer back surface is mechanically ground. After grinding, chemical processing on the back surface of the wafer may be continued as necessary. After these back surface treatment steps are completed, the adhesive film is peeled off from the wafer surface.
- One of the performances required for such an adhesive film for protecting the surface of a semiconductor wafer is the ability to prevent intrusion of cooling water (hereinafter referred to as grinding water) used when grinding the back surface of the wafer.
- grinding water cooling water
- On the wafer surface there is a recess recessed in a groove shape from the outermost periphery of the wafer due to a coating layer such as polyimide, a deposited film such as a silicon oxide film and a silicon nitride film, and a scribe line (dicing street).
- the depth of the recess recessed in a groove shape is about 2 ⁇ m to 20 ⁇ m.
- the adhesive layer When grinding the back surface of the wafer where the concave portion existing on the wafer surface reaches the outermost peripheral portion of the wafer, if the adhesive layer is not sufficiently adhered to the concave portion, the grinding water enters through the concave portion. Sometimes. Once the grinding water enters between the wafer surface and the adhesive film through the recess, the adhesive layer peels off from the wafer surface due to the invading grinding water, and the penetration of the grinding water between the wafer surface and the adhesive layer accelerates. And the entire surface of the integrated circuit tends to be contaminated by grinding debris that has entered with the grinding water. In the worst case, the adhesive film for surface protection may be peeled off during back surface grinding due to the ingress of grinding water, resulting in damage to the wafer.
- a measure is taken to increase the thickness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive film and improve the adhesion between the concave portion of the wafer surface and the pressure-sensitive adhesive layer.
- the adhesive force of the adhesive film to the wafer surface is greater than the strength of the wafer, and depending on various conditions such as wafer thickness and surface shape, the adhesive film is removed from the wafer surface after back grinding.
- an automatic peeling machine may cause a peeling trouble to deteriorate workability, and sometimes the wafer is completely damaged.
- the depth of the recess exceeds 20 ⁇ m, and in order to cope with such a wafer, if the thickness of the adhesive layer is further increased, the production of an adhesive film
- the minimum value (G′min) of the storage elastic modulus (G ′) at 50 to 100 ° C. of the pressure-sensitive adhesive layer (B) is 0.07 to 5 MPa.
- the storage elastic modulus at 50 ° C. of at least one layer (C) is 0.001 MPa or more and less than 0.07 MPa, and the thickness (tb, unit: ⁇ m) of the pressure-sensitive adhesive layer (B) and the storage elastic modulus are set as follows.
- An adhesive film for protecting a semiconductor wafer surface is disclosed in which the total thickness (tc, unit: ⁇ m) of the intermediate layer (C) has a relationship of Formula (1): tc ⁇ 3tb (for example, (See Kaikai 2003-173994).
- the pressure-sensitive adhesive film disclosed in Japanese Patent Application Laid-Open No. 2003-173994 can follow irregularities with protrusion heights as high as 200 ⁇ m, such as a flip-chip mounted bump electrode, and is said to have excellent adhesion.
- the pressure-sensitive adhesive layer has a functional group capable of reacting with a cross-linking agent, and 100 parts by weight of the polymer (A) having a temperature at which tan ⁇ of dynamic viscoelasticity is -50 to 5 ° C., 10 to 100 parts by weight of the polymer (B) having a functional group capable of reacting and having a temperature at which the tan ⁇ of dynamic viscoelasticity is maximum exceeds 5 ° C. and is 50 ° C.
- the pressure-sensitive adhesive film disclosed in Japanese Patent Application Laid-Open No. 2004-6746 is said to have excellent adhesion, damage prevention, and non-contamination.
- the semiconductor wafer used for the above applications is generally thinned to 200 ⁇ m or less by back surface grinding, and in some cases, the back surface is ground to about 50 ⁇ m. For this reason, it can be said that the risk of contamination and breakage of the wafer is further increased under grinding conditions in which the wafer is thinned to 200 ⁇ m or less.
- the shape of the surface of integrated circuits tends to become more complex, and some recesses on the wafer surface have a depth exceeding 20 ⁇ m. Yes. Some of them reach up to about 50 ⁇ m. Therefore, the adhesive film for protecting a semiconductor wafer surface is required to have excellent adhesion to a wafer surface having irregularities. On the other hand, there are various process conditions for peeling an adhesive film from a wafer, and it is also required to exhibit good peelability in a wide peel speed range.
- An object of the present invention is to provide an adhesive film for protecting a surface of a semiconductor wafer that is excellent and has excellent releasability when peeled from a semiconductor wafer, a method for protecting a semiconductor wafer using the same, and a method for manufacturing a semiconductor device.
- the means for solving the above-mentioned problems are as follows.
- the pressure-sensitive adhesive layer has a polymer (A) having a maximum dynamic viscoelasticity tan ⁇ (Ta) exceeding 0 ° C. and a temperature (Tb) at which the dynamic viscoelastic tan ⁇ is maximum 0 ° C. or less.
- the polymer (A) contains 22% by mass to 30% by mass of structural units derived from acrylonitrile or methacrylonitrile.
- An adhesive film for protecting the surface of a semiconductor wafer having an adhesive strength of 1.0 N / 25 mm or more at a peeling speed of 10 mm / min.
- ⁇ 3> The semiconductor wafer surface according to ⁇ 1> or ⁇ 2>, wherein the base film includes at least one layer selected from an ethylene-vinyl acetate copolymer layer, a polyolefin layer, and a polyester layer.
- Protective adhesive film is not limited to an ethylene-vinyl acetate copolymer layer, a polyolefin layer, and a polyester layer.
- ⁇ 4> a first polymerization step in which a first polymerization material containing a raw material monomer for forming one of the polymer (A) and the polymer (B) is supplied to a reaction vessel to start polymerization; , After the first polymerization step, a second polymerization material containing a raw material monomer for forming the other of the polymer (A) and the polymer (B) is further supplied to the reaction vessel for polymerization.
- the pressure-sensitive adhesive layer is formed using a liquid containing the polymer (A) and the polymer (B) obtained by a method comprising a second polymerization step. The adhesive film for semiconductor wafer surface protection of any one of these.
- ⁇ 5> The above ⁇ 1> to ⁇ 3, wherein the pressure-sensitive adhesive layer is formed using a mixed liquid obtained by mixing a liquid containing the polymer (A) and a liquid containing the polymer (B). > The adhesive film for semiconductor wafer surface protection of any one of>.
- a method for manufacturing a semiconductor device comprising:
- the semiconductor wafer while maintaining non-contamination on the surface of the semiconductor wafer, the semiconductor wafer has excellent adhesion even when time passes after being attached to the wafer surface, and also has excellent releasability when peeling from the semiconductor wafer.
- An adhesive film for surface protection, a method for protecting a semiconductor wafer using the same, and a method for manufacturing a semiconductor device can be provided. Since the adhesive film for protecting a semiconductor wafer surface of the present invention has adhesion and easy peelability, it can be suitably used for a semiconductor wafer having a more complicated surface shape.
- the pressure-sensitive adhesive film for protecting a semiconductor wafer surface of the present invention (hereinafter sometimes abbreviated as pressure-sensitive adhesive film) has a base film and a pressure-sensitive adhesive layer on one surface of the base film, and the pressure-sensitive adhesive layer A polymer (A) having a temperature (Ta) at which tan ⁇ of dynamic viscoelasticity is maximum exceeds 0 ° C. and a polymer having a temperature (Tb) at which tan ⁇ of dynamic viscoelasticity is maximum of 0 ° C. or less.
- the adhesive film for protecting a semiconductor wafer surface of the present invention having such a configuration has an adhesive strength of 1.0 N / 25 mm or more at a peeling speed of 10 mm / min.
- the adhesive layer should just have on the at least one surface of a base film, and may have it on both surfaces.
- the polymer (B) having a maximum dynamic viscoelasticity tan ⁇ of 0 ° C. or lower is suitable for the pressure-sensitive adhesive layer. And has excellent adhesion to the recesses present on the wafer surface.
- the polymer (A) having a temperature at which tan ⁇ of dynamic viscoelasticity exceeds 0 ° C. is contained in a mass ratio (A / B): 57/43 to 90/10 with respect to the polymer (B). Then, the peelability is improved while maintaining the adhesion. This is considered because the toughness is improved by containing the polymer (A) in the above range.
- the temperature (Ta) and (Tb) at which the dynamic viscoelasticity tan ⁇ of the polymers (A) and (B) in the present invention is maximized means a value measured according to the method described in Examples described later. .
- the polymer (A) contains 22% by mass or more of a structural unit derived from acrylonitrile or methacrylonitrile, so that the peelability is excellent, and when it is 30% by mass or less, the toughness is moderately suppressed and the adhesiveness is excellent.
- the adhesive film for protecting a semiconductor wafer surface of the present invention is produced by forming an adhesive layer on at least one surface of a base film.
- a release film called a separator is stuck on the surface of the pressure-sensitive adhesive layer until it is used immediately after being manufactured.
- a pressure-sensitive adhesive coating solution is applied to one side of the release film and dried to form a pressure-sensitive adhesive layer. A method of transferring to at least one side is preferable.
- the base film of the adhesive film for protecting a semiconductor wafer surface of the present invention it is preferable to use a film obtained by molding a synthetic resin into a film.
- Examples of the raw material resin used for the base film include polyolefins such as polyethylene, polypropylene, polybutene, and ethylene- ⁇ -olefin copolymers, polymethylpentene, ethylene-vinyl acetate copolymer (EVA), and ethylene-ethyl acrylate.
- polyolefins such as polyethylene, polypropylene, polybutene, and ethylene- ⁇ -olefin copolymers, polymethylpentene, ethylene-vinyl acetate copolymer (EVA), and ethylene-ethyl acrylate.
- Copolymer ethylene-acrylic acid ester-maleic anhydride copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-methacrylic acid copolymer, ionomer resin, ethylene-propylene copolymer, butadiene elastomer, styrene
- Thermoplastic elastomers such as isoprene-based elastomers, polystyrene resins, polyvinyl chloride resins, polyvinylidene chloride resins, polyamide resins, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyester such as polybutylene terephthalate (PBT), polyimide, polyether sulfone (PES), polyether ether ketone (PEEK), polycarbonate, polyurethane, acrylic resin, fluorine-based resins, cellulose-based resin.
- PBT polybutylene terephthalate
- ethylene-vinyl acetate copolymer low density polyethylene, polypropylene, ethylene- ⁇ -olefin copolymer ( ⁇ -olefin having 3 to 8 carbon atoms), polyethylene terephthalate, polyethylene naphthalate, and the like are preferable.
- An ethylene-vinyl acetate copolymer is more preferred. More preferred is an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of about 5 to 50% by mass.
- the base film may be a single layer or a laminate of two or more layers.
- the base film preferably includes at least one layer selected from an ethylene-vinyl acetate copolymer layer, a polyolefin layer, and a polyester layer.
- the polyolefin layer include polyethylene, polypropylene, and an ethylene- ⁇ -olefin copolymer ( ⁇ -olefin having 3 to 8 carbon atoms).
- the polyester layer include polyethylene terephthalate and polyethylene naphthalate.
- the base film may be a thermoplastic resin molded or processed, and may be a cured curable resin after film formation.
- the base film is a laminate of two or more films
- a typical method for laminating a synthetic resin molded into a film is to extrude the synthetic resin with a T-die extruder. And a method of laminating with one surface of a synthetic resin film prepared in advance.
- the surface on the side where each synthetic resin film is laminated is subjected to an easy adhesion treatment such as corona discharge treatment or chemical treatment, or an adhesive layer between the two layers. May be provided.
- the synthetic resin is formed into a film by a method such as calendering, T-die extrusion, inflation, casting, etc.
- the thickness can be appropriately selected in consideration of the productivity and the thickness accuracy of the obtained film.
- the total thickness of the base film is preferably 10 ⁇ m to 300 ⁇ m, and more preferably 50 ⁇ m to 200 ⁇ m.
- the surface of the base film on the side where the pressure-sensitive adhesive layer is provided is preferably subjected to corona discharge treatment or chemical treatment in advance in order to improve the adhesive force between the base film and the pressure-sensitive adhesive layer.
- an undercoat layer may be formed between the base film and the pressure-sensitive adhesive layer.
- the release film examples include synthetic resin films such as polyethylene film, polypropylene film, polyethylene terephthalate film (hereinafter referred to as PET film). It is preferable that the surface is subjected to a release treatment such as silicone treatment as necessary.
- the thickness of the release film is usually about 10 ⁇ m to 1000 ⁇ m.
- the pressure-sensitive adhesive layer of the semiconductor wafer surface protecting pressure-sensitive adhesive film of the present invention has, as its basic component, a polymer (A) having a temperature (Ta) at which tan ⁇ of dynamic viscoelasticity reaches a maximum of 0 ° C. and a dynamic viscosity.
- a polymer (B) having a temperature (Tb) at which elastic tan ⁇ is maximized is 0 ° C. or less.
- Each of the polymer (A) and the polymer (B) preferably has a functional group capable of reacting with a crosslinking agent.
- the pressure-sensitive adhesive layer preferably further contains a cross-linking agent (C) having two or more cross-linking reactive functional groups in one molecule for controlling the cohesive force and the pressure-sensitive adhesive force.
- the polymer (A) is contained in a mass ratio (A / B) of 57/43 to 90/10 with respect to the polymer (B).
- the mass ratio (A / B) is more preferably 60/40 to 90/10, still more preferably 65/35 to 85/15, and most preferably 66/34 to 80/20.
- the adhesiveness of the pressure-sensitive adhesive layer to the wafer surface is lowered, and the grinding water is liable to enter the recesses on the wafer surface, which may lead to contamination and breakage of the semiconductor wafer.
- the peelability from a semiconductor wafer falls.
- the pressure-sensitive adhesive layer lacks the toughness, and the pressure-sensitive adhesive layer cannot withstand the load that causes the adhesive film to peel off the pressure-sensitive adhesive film on the pressure-sensitive adhesive layer. May also cause contamination and breakage of the semiconductor wafer.
- Examples of the polymer (A) and the polymer (B) include natural rubber, synthetic rubber, silicone polymer, and acrylic polymer. Both the polymer (A) and the polymer (B) are acrylic heavy. It is preferably a coalescence.
- As the acrylic polymer a copolymer containing a structural unit derived from an alkyl acrylate ester as a main component is preferable.
- the acrylic acid alkyl ester preferably includes an acrylic acid alkyl ester, a methacrylic acid alkyl ester, and a mixture thereof as a main monomer.
- alkyl acrylates and alkyl methacrylates include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-butyl acrylate, n-butyl methacrylate, 2-ethylhexyl acrylate, methacrylic acid
- Examples include 2-ethylhexyl and octyl acrylate. These may be used alone or in combination of two or more.
- the polymer (A) contains 22% by mass to 30% by mass and preferably 24% by mass to 30% by mass of a structural unit derived from acrylonitrile or methacrylonitrile.
- a structural unit derived from acrylonitrile or methacrylonitrile is 22% by mass or more, the peelability is excellent, and when it is 30% by mass or less, the toughness is moderately suppressed and the adhesion is excellent.
- the polymer (A) and the polymer (B) preferably have a functional group capable of reacting with a crosslinking agent.
- the functional group capable of reacting with the crosslinking agent include a hydroxyl group, a carboxyl group, an epoxy group, and an amino group.
- these functional groups are used when polymerizing the polymer (A) or the polymer (B). In general, a method of copolymerizing a comonomer having the following formula is used.
- Examples of the comonomer having a functional group include acrylic acid, methacrylic acid, itaconic acid, mesaconic acid, citraconic acid, fumaric acid, maleic acid, itaconic acid monoalkyl ester, mesaconic acid monoalkyl ester, citraconic acid monoalkyl ester, and fumaric acid.
- Acid monoalkyl ester maleic acid monoalkyl ester, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, n-butylaminoethyl Examples include acrylate and n-butylaminoethyl methacrylate.
- One of these comonomers may be copolymerized with an acrylic acid alkyl ester, or two or more may be copolymerized.
- the use amount (copolymerization amount) of the comonomer having a functional group capable of reacting with the above-mentioned crosslinking agent is 1% by mass to 40% by mass in the total amount of all monomers used as a raw material for the polymer (A) or the polymer (B). % Is preferred.
- the specific comonomer having a property as a surfactant in addition to the comonomer having a functional group capable of reacting with the alkyl ester of the polymer (A) and the polymer (B) and the crosslinking agent, the specific comonomer having a property as a surfactant. (Hereinafter referred to as a polymerizable surfactant) may be copolymerized.
- the polymerizable surfactant has a property of copolymerizing with an acrylic acid alkyl ester and a comonomer having a functional group, and has an action as an emulsifier when emulsion polymerization is performed.
- the surface of the wafer is usually not contaminated by the surfactant. Even when slight contamination due to the pressure-sensitive adhesive layer occurs, it can be easily removed by washing the wafer surface with water.
- polymerizable surfactants include, for example, those in which a polymerizable 1-propenyl group is introduced into the benzene ring of polyoxyethylene nonylphenyl ether [Daiichi Kogyo Seiyaku Co., Ltd .; trade name: Aqualon RN-10, RN-20, RN-30, RN-50, etc.], a polyoxyethylene nonylphenyl ether sulfate ester ammonium salt introduced with a polymerizable 1-propenyl group on the benzene ring [No.
- self-crosslinking properties such as isocyanate ethyl acrylate, isocyanate ethyl methacrylate, 2- (1-aziridinyl) ethyl acrylate, 2- (1-aziridinyl) ethyl methacrylate, N-methylol acrylamide, N-methylol methacrylamide, etc.
- Monomers with functional groups monomers with polymerizable double bonds such as vinyl acetate and styrene, divinylbenzene, vinyl acrylate, vinyl methacrylate, allyl acrylate, allyl methacrylate, and other typical commercial products
- both ends are diacrylate or dimethacrylate
- the structure of the main chain is a propylene glycol type [manufactured by NOF Corporation, trade names: PDP-200, PDP-400, ADP-200, ADP-400] , Tetramethylene glycol Type [manufactured by NOF Corporation, trade name: ADT-250, same ADT-850] and mixed type [manufactured by NOF Corporation, trade name: ADET-1800, same ADPT-4000] and the like.
- a polyfunctional monomer or the like may be copolymerized.
- the amount used is 0.1% by mass to 30% in all monomers. It is preferable that it is mass%. More preferably, the content is 0.1% by mass to 5% by mass.
- Examples of the polymerization reaction mechanism when polymerizing the polymer (A) and the polymer (B) include radical polymerization, anionic polymerization, and cationic polymerization.
- the polymerization is preferably performed by radical polymerization.
- organic compounds such as benzoyl peroxide, acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, di-t-butyl peroxide, di-t-amyl peroxide are used as radical polymerization initiators.
- Inorganic peroxides such as peroxide, ammonium persulfate, potassium persulfate, sodium persulfate, 2,2′-azobisisobutyronitrile, 2,2′-azobis-2-methylbutyronitrile, 4,4 And azo compounds such as' -azobis-4-cyanovaleric acid.
- a chain transfer agent may be added as necessary for the purpose of adjusting the molecular weight of the pressure-sensitive adhesive polymer.
- the chain transfer agent include conventional chain transfer agents such as mercaptans such as t-dodecyl mercaptan and n-dodecyl mercaptan.
- the amount of the chain transfer agent used is about 0.01 to 1.0 part by mass, more preferably 0.05 to 0.8 part by mass with respect to 100 parts by mass of the total amount of monomers.
- the polymerization method for the polymer (A) and the polymer (B) can be appropriately selected from known polymerization methods such as an emulsion polymerization method, a suspension polymerization method, and a solution polymerization method.
- an emulsion polymerization method that provides a high molecular weight copolymer.
- the polymer (A) and the polymer (B) are polymerized by an emulsion polymerization method, among the above-mentioned radical polymerization initiators, inorganic peroxidation such as water-soluble ammonium persulfate, potassium persulfate, sodium persulfate, etc.
- An azo compound having a carboxyl group in the molecule such as water-soluble 4,4′-azobis-4-cyanovaleric acid is preferred.
- azo compounds having a carboxyl group in the molecule such as ammonium persulfate and 4,4'-azobis-4-cyanovaleric acid, are more preferable.
- An azo compound having a carboxyl group in the molecule such as 4,4'-azobis-4-cyanovaleric acid is particularly preferred.
- the polymer (A) and the polymer (B) may be (1) polymerized separately and then mixed, or (2) by a series of polymerization steps in one reaction vessel, You may obtain a polymer (A) and a polymer (B) collectively.
- the polymer (A) is polymerized to prepare a liquid containing the polymer (A), and the polymer (B) is separately polymerized to obtain the polymer (B).
- the method of preparing the liquid containing this and preparing the liquid mixture which mixed these is mentioned.
- the polymer (A) and the polymer (B) may be present separately in the liquid, or may be entangled (or attached) to each other.
- the first polymerization material containing the raw material monomer for forming one of the polymer (A) and the polymer (B) is supplied to the reaction vessel to initiate the polymerization.
- a second polymerization material containing a raw material monomer for forming the other of the polymer (A) and the polymer (B) is further supplied to the reaction vessel. And a second polymerization step for polymerization.
- polymerization conditions are carried out in the same manner as the conventional general emulsion polymerization. Temperature, polymerization time, polymerization pressure, etc.) and materials used (polymerization initiator, surfactant, etc.) can be appropriately employed.
- the raw material monomer supply method any of a batch charging method, a continuous supply (dropping) method, a divided supply (dropping) method, and the like that supply all the monomer raw materials to the polymerization vessel at once can be employed.
- a part or all of the monomer raw material may be preliminarily mixed with water and emulsified, and the emulsion may be supplied into the reaction vessel.
- the supply method of the first polymerization material and the supply method of the second polymerization material may be the same or different.
- the monomer raw materials in the first polymerization material and the second polymerization material are supplied to the reaction vessel so that the mass ratio of the obtained polymer (A) / polymer (B) is 57/43 to 90/10.
- first polymerization step and the second polymerization step conventionally known various chain transfer agents can be used as necessary.
- the chain transfer agent may be added in both the first polymerization step and the second polymerization step, or may be added only in one polymerization step.
- the amount of the chain transfer agent used is increased under the same conditions, the molecular weight of the resulting polymer is decreased, so that the adhesion is increased but the contamination is liable to deteriorate.
- a monomer raw material for forming the polymer (A) as the first polymerization material is supplied into the reaction vessel for polymerization, and then the monomer raw material for forming the polymer (B) as the second polymerization material Is preferably supplied into the reaction vessel for polymerization.
- Both the polymer (A) and the polymer (B) are preferably acrylic polymers.
- the polymer (A) preferably uses an alkyl acrylate ester as a main monomer and acrylonitrile or methacrylonitrile as a comonomer.
- the polymer (A) preferably contains an acrylic acid alkyl ester as a main monomer and contains 22% by mass to 30% by mass of a structural unit derived from acrylonitrile or methacrylonitrile as a comonomer, more preferably acrylic acid as the main monomer.
- An alkyl ester is used and contains 24 to 30 parts by mass of a structural unit derived from acrylonitrile or methacrylonitrile as a comonomer.
- the polymer (B) is not particularly limited as long as the temperature (Tb) at which the dynamic viscoelasticity tan ⁇ is maximized is 0 ° C. or less, but an alkyl acrylate can be used as the main monomer. Moreover, acrylonitrile or methacrylonitrile can also be used as a comonomer which comprises a polymer (B). Among these, acrylonitrile is more preferable because it tends to have better contamination.
- the structural unit derived from acrylonitrile or methacrylonitrile is 1 part by mass to 20 parts by mass in 100 parts by mass of the polymer (B). It is preferably 5 to 20 parts by mass, more preferably 5 to 15 parts by mass.
- the amount of the chain transfer agent used in the first polymerization step is preferably 90% by mass or more of the total amount of the chain transfer agent, preferably 95% by mass or more, and more preferably 99% by mass or more. .
- the temperatures (Ta) and (Tb) at which tan ⁇ is maximized are (a) the type and amount of the main monomer constituting the polymer (A) and the polymer (B), and (b) the functionality capable of reacting with the crosslinking agent. It can adjust with the kind and usage-amount of the comonomer which has group.
- the type and amount of the main monomer constituting the polymer (A) and the polymer (B), when an alkyl alkyl acrylate is used as the main monomer, the carbon of the alkyl group as the main monomer If the number is 3 to 8, the higher the number of carbon atoms in the alkyl group, the lower the temperature at which tan ⁇ is maximum. If the number of carbon atoms in the alkyl group is 9 or more, the number of carbon atoms in the alkyl group As the number increases, the temperature at which tan ⁇ is highest tends to increase. Further, when methacrylic acid esters are used as the main monomer, the temperature at which tan ⁇ is maximized tends to increase. In any case, the greater the amount of these main monomers used, the greater the effect on the temperature at which tan ⁇ is maximized.
- a polymer (B) in which the temperature (Ta) at which tan ⁇ is maximized is in a relatively low temperature range of 0 ° C. or less, n-butyl acrylate, 2-ethylhexyl acrylate, acrylic It is preferable to use many alkyl acrylates having 4 to 8 carbon atoms in the alkyl group, such as octyl acid.
- a polymer (A) in which the temperature (Tb) at which tan ⁇ is maximized is in a relatively high temperature range exceeding 0 ° C.
- mainly such as methyl acrylate, ethyl acrylate, and n-butyl acrylate are used. It is preferable to use many alkyl acrylates having 2 to 4 carbon atoms in the alkyl group and alkyl methacrylates.
- (B) Regarding the type and amount (copolymerization amount) of a comonomer having a functional group capable of reacting with a crosslinking agent, among those usually used as a comonomer, for example, acrylic acid, methacrylic acid, itaconic acid, etc.
- a crosslinking agent for example, acrylic acid, methacrylic acid, itaconic acid, etc.
- those having a carboxyl group those having an amide group such as acrylamide, methacrylamide, N-methylolacrylamide, and methacrylic acid esters such as glycidyl methacrylate and 2-hydroxyethyl methacrylate.
- amide group such as acrylamide, methacrylamide, N-methylolacrylamide, and methacrylic acid esters
- glycidyl methacrylate and 2-hydroxyethyl methacrylate there is a tendency to shift the temperature at which tan ⁇ is maximum to the high temperature side, and the tendency increases as
- crosslinking agent (C) having two or more crosslinking reactive functional groups in one molecule used in the present invention sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, Epoxy crosslinking agents such as glycerol polyglycidyl ether, neopentyl glycol diglycidyl ether, resorcin diglycidyl ether, trimethylolpropane-tri- ⁇ -aziridinylpropionate, tetramethylolmethane-tri- ⁇ -aziridinyl Propionate, N, N′-diphenylmethane-4,4′-bis (1-aziridinecarboxamide), N, N′-hexamethylene-1,6-bis (1-aziridinecarboxamide), N, N ′ -toluene- Azi
- the pressure-sensitive adhesive is an aqueous pressure-sensitive adhesive such as an aqueous solution or an emulsion using water
- the crosslinking reaction with the pressure-sensitive adhesive polymer is fast because the isocyanate-based cross-linking agent has a fast deactivation rate due to side reaction with water. May not progress sufficiently. Therefore, in this case, it is preferable to use an aziridine-based or epoxy-based crosslinking agent among the above-mentioned crosslinking agents.
- the content of the crosslinking agent (C) having two or more crosslinking reactive functional groups in one molecule is 0.1% relative to 100 parts by mass of the total amount of the polymer (A) and the polymer (B).
- the amount is preferably from 10 parts by mass to 10 parts by mass. If the content of the cross-linking agent is less than 0.1 parts by mass, the cohesive force of the pressure-sensitive adhesive layer becomes insufficient, and the wafer surface may be contaminated. If the content of the cross-linking agent exceeds 10 parts by mass, the adhesiveness of the adhesive layer to the recesses on the wafer surface decreases, and the semiconductor wafer breaks due to the ingress of water and grinding debris during grinding of the wafer back surface. May contaminate the wafer surface.
- a crosslinking agent (C) having two or more crosslinking reactive functional groups in one molecule In order to adjust the adhesive properties, rosin-based and terpene resin-based tackifiers, various surfactants, and the like may be appropriately contained. Moreover, when the polymer (A) and the polymer (B) are prepared as an emulsion liquid, a film-forming auxiliary such as diethylene glycol monobutyl ether may be appropriately contained to such an extent that the object of the present invention is not affected.
- the thickness of the adhesive layer of the adhesive film for protecting a semiconductor wafer surface may affect the adhesion to the recesses on the wafer surface, the adhesive force, and the like.
- the thickness of the pressure-sensitive adhesive layer is reduced, the adhesion to the recesses on the wafer surface may be insufficient, and grinding water may enter through the recesses and contaminate the wafer surface.
- the thickness of the pressure-sensitive adhesive layer is preferably 5 ⁇ m to 200 ⁇ m. More preferably, it is 10 ⁇ m to 100 ⁇ m.
- the pressure-sensitive adhesive layer when the pressure-sensitive adhesive layer is formed on one surface of the base film, the pressure-sensitive adhesive is used as a solution or an emulsion liquid (hereinafter collectively referred to as a pressure-sensitive adhesive coating liquid), a roll coater, a comma
- a pressure-sensitive adhesive coating liquid a solution or an emulsion liquid
- a roll coater a comma
- a method of forming a pressure-sensitive adhesive layer by sequentially applying and drying in accordance with a known method such as a coater, a die coater, a Mayer bar coater, a reverse roll coater, or a gravure coater can be used.
- a release film to the surface of the applied pressure-sensitive adhesive layer.
- a pressure-sensitive adhesive coating solution is applied to one surface of the release film according to the above-described known method and dried to form a pressure-sensitive adhesive layer, and then the pressure-sensitive adhesive layer is formed into a base material using a conventional method such as a dry laminating method.
- a method of transferring to a film (hereinafter referred to as a transfer method) may be used.
- the drying conditions for drying the pressure-sensitive adhesive coating solution are not particularly limited, but in general, it is preferably dried for 10 seconds to 10 minutes in a temperature range of 80 ° C. to 300 ° C. More preferably, drying is performed at a temperature range of 80 ° C. to 200 ° C. for 15 seconds to 10 minutes.
- the pressure-sensitive adhesive film for protecting the semiconductor wafer surface is formed. You may heat at 40 to 80 degreeC for about 5 to 300 hours.
- the adhesive strength at a peeling speed of 10 mm / min to 1000 mm / min is preferably 4.0 N / 25 mm or less, more preferably 3.0 N / 25 mm or less, and further preferably 2.5 N / 25 mm or less. preferable.
- the adhesive strength is in the above range, the peeling workability when peeling from the semiconductor wafer is excellent. If the adhesive force is too high, the peeling workability is lowered, and the semiconductor wafer may be damaged during peeling.
- the method for protecting a semiconductor wafer according to the present invention includes an attaching step of attaching the adhesive layer in the adhesive film for protecting a semiconductor wafer surface of the present invention to a circuit forming surface of the semiconductor wafer, and for protecting the surface of the semiconductor wafer.
- the release film is peeled off from the adhesive layer of the semiconductor wafer surface protecting adhesive film (hereinafter referred to as an adhesive film) to expose the surface of the adhesive layer, and the adhesive layer is in contact with the adhesive film. Is attached to the wafer surface.
- the semiconductor wafer is fixed to the chuck table or the like of the grinding machine through the base film layer of the adhesive film, and the back surface of the wafer is ground. After the grinding is finished, the adhesive film is peeled off. After grinding the back surface of the wafer, before the adhesive film is peeled off, the back surface of the wafer may be processed by a chemical solution such as chemical etching or polishing.
- cleaning processes such as water washing and plasma washing, are given with respect to the wafer surface.
- the thickness of the semiconductor wafer before grinding of the back surface is usually 500 ⁇ m to 1000 ⁇ m, depending on the type of semiconductor chip, etc. Usually, the thickness is reduced by grinding to a thickness of about 200 ⁇ m to 600 ⁇ m, and sometimes to a thickness of about 20 ⁇ m.
- the process of treating the back surface with a chemical solution is a back surface grinding process in order to improve the strength of the semiconductor wafer by removing the crushed layer generated on the back surface of the wafer by mechanical grinding. In some cases, this is followed by.
- the thickness of the semiconductor wafer before grinding is appropriately determined depending on the diameter and type of the semiconductor wafer, and the thickness after grinding is appropriately determined depending on the size of the chip to be obtained, the type of circuit, and the like.
- the operation of adhering the adhesive film to the semiconductor wafer may be performed manually, but is generally performed using an apparatus called an automatic pasting machine attached with an adhesive film wound in a roll shape.
- an automatic pasting machine for example, Takatori Co., Ltd., model: ATM-1000B, ATM-1100, Teikoku Seiki Co., Ltd., model: STL series, Nitto Seiki Co., Ltd., model: DR- 8500II etc. are mentioned.
- the temperature when sticking the adhesive film on the surface of the semiconductor wafer is carried out at a room temperature of around 25 ° C.
- the semiconductor wafer is kept at a predetermined temperature (usually, before the adhesive film is pasted). The temperature is raised to about 40 ° C. to 90 ° C.).
- the method of grinding the back surface of the wafer there is no particular limitation on the method of grinding the back surface of the wafer, and known grinding methods such as a through-feed method and an in-feed method are adopted.
- the grinding is preferably performed while cooling the semiconductor wafer and the grindstone with water.
- a grinding machine for grinding the back surface of a wafer for example, manufactured by DISCO Corporation, model: DFG-860, manufactured by Okamoto Machine Tool Co., Ltd., model: SVG-502MKII8, manufactured by Tokyo Seimitsu Co., Ltd., model: polish grinder PG200 etc. are mentioned.
- the adhesive film is peeled off from the wafer surface.
- an automatic peeling machine Takatori Co., Ltd., model: ATRM-2000B, ATRM-2100, Teikoku Seiki Co., Ltd., model: STP series, Nitto Seiki Co., Ltd., model: HR-8500II Etc.
- an adhesive tape called a peeling tape used when the semiconductor wafer surface protecting adhesive film is peeled from the wafer surface by the automatic peeling machine for example, Sumitomo 3M Co., Ltd. Highland Mark Filament Tape No. 897 or the like can be used.
- the temperature at which the pressure-sensitive adhesive film for protecting a semiconductor wafer surface is peeled off from the wafer surface is usually performed at a room temperature of about 25 ° C., but if the automatic peeling machine has a function of heating the wafer, The adhesive film may be peeled off while the semiconductor wafer is heated to a predetermined temperature (usually about 40 ° C. to 90 ° C.).
- the wafer surface after peeling the adhesive film is cleaned as necessary.
- the cleaning method include wet cleaning such as water cleaning and solvent cleaning, and dry cleaning such as plasma cleaning. In the case of wet cleaning, ultrasonic cleaning may be used in combination. These cleaning methods are appropriately selected depending on the contamination state of the wafer surface.
- Semiconductor wafers to which the method for protecting a semiconductor wafer of the present invention can be applied are not limited to silicon wafers, but include semiconductor wafers such as germanium, gallium-arsenic, gallium-phosphorus, and gallium-arsenic-aluminum.
- the semiconductor device manufacturing method of the present invention includes a bonding step of bonding so that the adhesive layer in the adhesive film for protecting a semiconductor wafer surface of the present invention is in contact with the circuit forming surface of the semiconductor wafer, and the surface of the semiconductor wafer.
- the sticking step, grinding step, and peeling step in the method for manufacturing a semiconductor device are the same as the above-described method for protecting a semiconductor wafer.
- Other optional chemical processing, cleaning, and the like are the same as the above-described method for protecting a semiconductor wafer.
- Tmax (° C) at which tan ⁇ of the dynamic viscoelasticity of the polymer is maximized PET film with a silicone treatment applied to one surface under the same conditions as the coating conditions (drying temperature, drying time, etc.) for producing each pressure-sensitive adhesive layer in Examples and Comparative Examples [Mitsui Chemicals Tosero Co., Ltd.
- the emulsion solution of each polymer is applied and dried on the release-treated surface side of “Product name: SP-PET”, and a polymer layer having a thickness after drying of 50 ⁇ m to 60 ⁇ m is formed.
- the obtained polymer layers are sequentially overlapped to obtain a polymer film sample having a thickness of about 1 mm. From this film-like sample, a width of about 10 mm and a length of about 50 mm are cut out to make a sample.
- the storage elastic modulus of the obtained sample was measured in a temperature range of ⁇ 50 ° C. to 100 ° C. at a frequency of 1 Hz using a dynamic viscoelasticity measuring apparatus [manufactured by TA Instruments, model: RSA-III]. To do. Specifically, the sample is set in a dynamic viscoelasticity measuring apparatus via an attachment at 25 ° C., and tan ⁇ of dynamic viscoelasticity is measured while the temperature is increased at a temperature increase rate of 5 ° C./min. After the measurement is completed, the temperature [Tmax] at which tan ⁇ becomes maximum is read from the obtained tan ⁇ -temperature curve at ⁇ 50 ° C. to 100 ° C.
- sample emulsion solutions for measuring tan ⁇ of dynamic viscoelasticity were separately prepared. Specifically, the process was performed until the first aging step, and the obtained emulsion was used as a measurement sample for the first stage polymer. In addition, only the second stage process was performed separately, and the resulting emulsion was used as a measurement sample for the second stage polymer.
- Adhesive strength measurement Except for the conditions specified below, all measurements were performed according to the method specified in JIS Z0237-1991. In an atmosphere of 23 ° C., the surface protective adhesive films obtained in Examples and Comparative Examples were attached to the surface of a 5 cm ⁇ 20 cm SUS304-BA plate (JIS G4305-1991 regulation) through the adhesive layer. Leave for 1 hour. After standing, the one end of the adhesive film was pinched, the stress at the time of peeling from the surface of the SUS304-BA plate at a peeling angle of 180 degrees and a predetermined peeling speed was measured with a tensile tester and converted to N / 25 mm.
- the surface protective adhesive film obtained in Examples and Comparative Examples was attached to the surface of the silicon wafer through the adhesive layer, and observed from the substrate side with an optical microscope at 5 magnifications, 23 ° C. Pictures were taken after standing for 24 hours in an atmosphere prepared at ⁇ 2 ° C. and relative humidity 50 ⁇ 5%.
- the ratio of the area of the adhesive layer attached to the scribe line to the total area of the scribe line is used as an index of adhesion, and the adhesive area ratio of the adhesive layer to the scribe line is 80% or more, the adhesiveness is excellent. evaluated.
- Contamination evaluation The contamination property of the silicon mirror wafer chip surface was evaluated with an X-ray photoelectron spectroscopy analyzer (manufactured by Shimadzu Corporation, trade name: ESCA-3200).
- the surface protective adhesive films obtained in the examples and comparative examples were bonded to the entire surface of a silicon mirror wafer (diameter: 100 mm, thickness: 600 ⁇ m) to which no foreign matter had adhered via the adhesive layer. After leaving for 1 hour in an atmosphere adjusted to 2 ° C and relative humidity 50 ⁇ 5%, peel off the adhesive film for surface protection from the silicon mirror wafer, and then cut the silicon mirror wafer into 1 cm square using a diamond glass cutter. To do.
- ⁇ ESCA measurement conditions > X-ray source: Mg—K ⁇ ray (1252.0 eV), X-ray output: 300 W, measurement vacuum degree: 2 ⁇ 10 ⁇ 7 Pa or less, C / Si ratio; (carbon peak area) / (silicon peak area).
- ⁇ C / Si ratio evaluation method The C / Si ratio on the surface of the silicon mirror wafer before applying the surface protective adhesive film is 0.10 (blank value). Therefore, it was evaluated that there was no contamination when the C / Si ratio on the surface of the silicon mirror wafer after the surface protective adhesive film was peeled was 0.10 to 0.50, and that there was contamination when the C / Si ratio was more than that.
- Example 1 ⁇ Preparation of base film> Ethylene-vinyl acetate copolymer resin [Mitsui / DuPont Polychemical Co., Ltd., trade name: Evaflex V5961, vinyl acetate unit content 9 mass%] manufactured using a T-die extruder to a thickness of 90 ⁇ m The film was coated and subjected to corona treatment on the side to which the adhesive was applied. The thickness variation of the obtained film was within ⁇ 1.5%.
- a polymerization vessel equipped with a stirrer, reflux condenser, thermometer and nitrogen gas inlet is charged with 500 parts of deionized water and purged with nitrogen gas. The temperature is raised to 70 ° C. to 72 ° C.
- Ammonium sulfate (hereinafter abbreviated as polymerization initiator (1)) 5 parts, polyoxyethylene nonylphenyl ether as water-soluble monomer (average value of added moles of ethylene oxide: about 20) on the benzene ring of sulfate ester ammonium salt 0.15 part of a compound having a polymerizable 1-propenyl group added [manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Aqualon HS-10] (hereinafter abbreviated as water-soluble monomer (1)) is added.
- the polymer described in [Table 1] is added under stirring of 230 parts of deionized water, 10 parts of a polymerization initiator (1), and 3.4 parts of a water-soluble monomer (1).
- An emulsion prepared by adding 700 parts of a monomer mixture for forming A) and 3.2 parts of n-dodecyl mercaptan as an additive is continuously added to the above polymerization vessel over 5 hours and allowed to react. After completion of the addition, aging was further performed for 1 hour.
- a polymer of 88% 2-ethylhexyl acrylate, 10% acrylonitrile and 2% acrylic acid is prepared in advance by stirring with 135 parts deionized water and 1.5 parts water-soluble monomer (1).
- the pressure-sensitive adhesive coating solution was applied to a polypropylene film (release film, thickness 50 ⁇ m) and dried at 90 ° C. for 10 minutes to provide a pressure-sensitive adhesive layer having a thickness of 80 ⁇ m.
- the pressure-sensitive adhesive was laminated on the base film by pasting and pressing the corona-treated side of the above-mentioned ethylene-vinyl acetate copolymer film (base film). After lamination, the film was heated at 40 ° C. for 120 hours, and then cooled to room temperature to prepare a surface protective adhesive film.
- the measurement and evaluation results of various characteristic values are shown in [Table 2].
- Example 1 In the production of the pressure-sensitive adhesive main agent, Example 1 and Example 1 were changed except that the monomer mixture for producing the first emulsion was changed as described in each Example column of [Table 1]. Similarly, an adhesive film for surface protection was produced. The measurement and evaluation results of various characteristic values are shown in [Table 2].
- Adhesive layer using ethylene-vinyl acetate copolymer resin [Mitsui / DuPont Polychemical Co., Ltd., trade name: Everflex V5961, vinyl acetate unit content 9%] formed on a substrate film to 160 ⁇ m was prepared in the same manner as in Example 3 except that the thickness was 45 ⁇ m (drying time: 5 minutes). The measurement and evaluation results of various characteristic values are shown in [Table 2].
- Example 7 A polymerization vessel equipped with a stirrer, reflux condenser, thermometer and nitrogen gas inlet is charged with 500 parts of deionized water and purged with nitrogen gas. The temperature is raised to 70 ° C. to 72 ° C.
- Ammonium sulfate (hereinafter abbreviated as polymerization initiator (1)) 5 parts, polyoxyethylene nonylphenyl ether as water-soluble monomer (average value of added moles of ethylene oxide: about 20) on the benzene ring of sulfate ester ammonium salt 0.15 part of a compound having a polymerizable 1-propenyl group added [manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Aqualon HS-10] (hereinafter abbreviated as water-soluble monomer (1)) is added.
- polymerization initiator (1) polyoxyethylene nonylphenyl ether as water-soluble monomer (average value of added moles of ethylene oxide: about 20) on the benzene ring of sulfate ester ammonium salt 0.15 part of a compound having a polymerizable 1-propenyl group added [manufactured by Daiichi Kogyo Seiyaku
- ammonium persulfate (hereinafter abbreviated as polymerization initiator (1)), polyoxyethylene nonylphenyl ether (average value of the number of moles of ethylene oxide added: about 20) as a water-soluble monomer, benzene sulfate ammonium salt 0.15 parts of a compound having a polymerizable 1-propenyl group added to the ring [Daiichi Kogyo Seiyaku Co., Ltd., trade name: Aqualon HS-10] (hereinafter abbreviated as water-soluble monomer (1)) Put in.
- polymerization initiator (1) polyoxyethylene nonylphenyl ether (average value of the number of moles of ethylene oxide added: about 20) as a water-soluble monomer
- benzene sulfate ammonium salt 0.15 parts of a compound having a polymerizable 1-propenyl group added to the ring [Daiichi Kogyo Seiyaku Co., Ltd.,
- a surface-protective pressure-sensitive adhesive film is produced in the same manner as in Example 1 except that a mixture of acrylic polymer A1 and acrylic polymer B1 at the same ratio 70/30 as in Example 3 is used as the adhesive main agent. did.
- the measurement and evaluation results of various characteristic values are shown in [Table 2].
- Ammonium sulfate (hereinafter abbreviated as polymerization initiator (1)) 5 parts, polyoxyethylene nonylphenyl ether as water-soluble monomer (average value of added moles of ethylene oxide: about 20) on the benzene ring of sulfate ester ammonium salt 0.15 part of a compound having a polymerizable 1-propenyl group added [manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Aqualon HS-10] (hereinafter abbreviated as water-soluble monomer (1)) is added.
- polymerization initiator (1) polyoxyethylene nonylphenyl ether as water-soluble monomer (average value of added moles of ethylene oxide: about 20) on the benzene ring of sulfate ester ammonium salt 0.15 part of a compound having a polymerizable 1-propenyl group added [manufactured by Daiichi Kogyo Seiyaku
- Example 3 the first and second stages used in Example 3 were previously stirred with 365 parts deionized water, 10 parts polymerization initiator (1) and 4.85 parts water-soluble monomer (1).
- An emulsion prepared by adding 1000 parts of all the constituent monomer mixtures of the eye and 3.2 parts of n-dodecyl mercaptan as an additive was continuously added to the above polymerization vessel over 7 hours and allowed to react. Further, aging was performed for 3 hours to obtain an acrylic resin emulsion. This was neutralized with 10% aqueous ammonia (pH 7.0) to obtain an acrylic polymer (adhesive main agent) having a solid content of 53.5%.
- a surface protective adhesive film was prepared in the same manner as in Example 1 except that the acrylic polymer was used as the adhesive main agent. The measurement and evaluation results of various characteristic values are shown in [Table 3].
- 4'-azobis-4-cyanovaleric acid [manufactured by Otsuka Chemical Co., Ltd., trade name: ACVA] 0.5 part, 2-ethylhexyl acrylate 94 parts, methacrylic acid 2 parts, acrylamide 1 part, n-dodecyl 0.1 part of mercaptan, polyoxyethylene nonylphenyl ether as water-soluble monomer (average value of the number of moles of ethylene oxide added: about 20) A polymerizable 1-propenyl group was added to the benzene ring of sulfate ammonium salt.
- a polymerization vessel equipped with a stirrer, reflux condenser, thermometer, and nitrogen gas inlet is charged with 135 parts of deionized water and purged with nitrogen gas, and the temperature is raised to 70 ° C. to 72 ° C.
- the coating liquid A was applied to a polypropylene film (release film, thickness 50 ⁇ m) and dried at 90 ° C. for 5 minutes to provide a pressure-sensitive adhesive layer having a thickness of 40 ⁇ m. This was bonded to the corona-treated side of the above-mentioned ethylene-vinyl acetate copolymer film (base film) and pressed to obtain an intermediate film.
- the coating liquid B was applied to a polypropylene film (release film, thickness 50 ⁇ m) and dried at 90 ° C. for 2 minutes to provide an adhesive layer having a thickness of 10 ⁇ m.
- the film was heated at 40 ° C. for 72 hours, and then cooled to room temperature to prepare a surface protective adhesive film.
- the measurement and evaluation results of various characteristic values are shown in [Table 3].
- n-BA n-butyl acrylate
- AN acrylonitrile
- AA acrylic acid
- AM acrylamide
- 2EHA 2-ethylhexyl acrylate
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Abstract
Description
参照。)。
一方で、ウェハから粘着フィルムを剥離するプロセス条件は様々であり、広い剥離速度範囲において良好な剥離性を示すことも要求されている。
前記基材フィルムの片表面に粘着剤層と、を有し、
前記粘着剤層が、動的粘弾性のtanδが最大となる温度(Ta)が0℃を超える重合体(A)と、動的粘弾性のtanδが最大となる温度(Tb)が0℃以下である重合体(B)とを、質量比(A/B):57/43~90/10で含有し、
前記重合体(A)が、アクリロニトリル又はメタアクリロニトリルに由来する構造単位を22質量%~30質量%含む、
剥離速度10mm/minでの粘着力が1.0N/25mm以上の半導体ウェハ表面保護用粘着フィルム。
第一の重合工程の後に、前記重合体(A)及び前記重合体(B)の他方を形成するための原料モノマーを含有する第二重合用材料を前記反応容器にさらに供給して重合させる第二の重合工程と、を含む方法により得られる前記重合体(A)及び前記重合体(B)を含有する液を用いて前記粘着剤層が形成されてなる、前記<1>~<3>のいずれか1項に記載の半導体ウェハ表面保護用粘着フィルム。
前記半導体ウェハ表面保護用フィルムが貼着された前記半導体ウェハにおける回路非形成面を研削する研削工程と、
前記半導体ウェハ表面保護用粘着フィルムを前記半導体ウェハから剥離する剥離工程と、
を含む、半導体ウェハの保護方法。
前記半導体ウェハ表面保護用フィルムが貼着された前記半導体ウェハにおける回路非形成面を研削する研削工程と、
前記半導体ウェハ表面保護用粘着フィルムを前記半導体ウェハから剥離する剥離工程と、
を含む、半導体装置の製造方法。
本発明の半導体ウェハ表面保護用粘着フィルム(以下、粘着フィルムと略称することもある)は、基材フィルムと、前記基材フィルムの片表面に粘着剤層と、を有し、前記粘着剤層が、動的粘弾性のtanδが最大となる温度(Ta)が0℃を超える重合体(A)と、動的粘弾性のtanδが最大となる温度(Tb)が0℃以下である重合体(B)とを、質量比(A/B):57/43~90/10で含有し、前記重合体(A)が、アクリロニトリル又はメタアクリロニトリルに由来する構造単位を22質量%~30質量%含む。このような構成の本発明の半導体ウェハ表面保護用粘着フィルムは、剥離速度10mm/minでの粘着力が1.0N/25mm以上である。
尚、粘着剤層は、基材フィルムの少なくとも片表面に有していればよく、両表面に有していてもよい。
第一重合用材料として重合体(A)を形成するためのモノマー原料を反応容器内に供給して重合させ、次に、第二重合用材料として重合体(B)を形成するためのモノマー原料を反応容器内に供給して重合させることが好ましい。
実施例、及び比較例における各粘着剤層を作製するときの塗工条件(乾燥温度、乾燥時間等)と同条件において、片表面にシリコーン処理が施されたPETフィルム[三井化学東セロ(株)製、商品名:SP-PET]の離型処理面側に各々の重合体のエマルション液を、塗布、乾燥し、乾燥後の厚みが50μm~60μmの重合体層を形成する。得られた重合体層同士を順次重ね合わせ、厚み約1mm程度の重合体のフィルム状サンプルを得る。このフィルム状サンプルから、幅10mm、長さ50mm程度を切り出して試料とする。
下記に規定した条件以外は、全てJIS Z0237-1991に規定される方法に準じて測定した。23℃の雰囲気下において、実施例及び比較例で得られた表面保護用粘着フィルムを、その粘着剤層を介して5cm×20cmのSUS304-BA板(JIS G4305-1991規定)の表面に貼り付けて1時間放置する。放置後、粘着フィルムの一端を狭持し、剥離角度180度、所定の剥離速度でSUS304-BA板の表面から剥離する際の応力を引張試験機にて測定し、N/25mmに換算した。
集積回路が組み込まれた下記の半導体シリコンウェハを用いて評価した。
・ウェハ1:直径100mm、厚み725μm、スクライブライン;深さ10μm、幅400μm
・ウェハ2:直径100mm、厚み725μm、スクライブライン:深さ5μm、幅400μm
X線光電子分光分析装置((株)島津製作所製、商品名:ESCA-3200)にてシリコンミラーウェハチップ表面の汚染性を評価した。実施例及び比較例で得られた表面保護用粘着フィルムをその粘着剤層を介して異物が付着していないシリコンミラーウェハ(直径100mm、厚み600μm)の全面に貼り付けた状態で、23℃±2℃、相対湿度50±5%に調製された雰囲気中で1時間放置した後、表面保護用粘着フィルムをシリコンミラーウェハから剥し、次いでダイヤモンドグラスカッターを用いて、シリコンミラーウェハを1cm角に切断する。切断した1cm角のシリコンミラーウェハから無作為に5個を採取し、それらの表面に対してESCAによる分析を下記条件にて実施し、C/Si比(5個の平均値)を求めることによって、有機物による該チップ表面の汚染状態を測定した。
X線源;Mg-Kα線(1252.0eV)、X線出力;300W、測定真空度;2X10-7Pa以下、C/Si比;(炭素のピーク面積)/(珪素のピーク面積)。
表面保護用粘着フィルムを貼り付ける前のシリコンミラーウェハ表面のC/Si比は、0.10(ブランク値)である。したがって、表面保護用粘着フィルムを剥した後のシリコンミラーウェハ表面のC/Si比が0.10~0.50の場合は汚染無し、それを超える場合は汚染有りと評価した。
<基材フィルムの作製>
エチレン-酢酸ビニル共重合体樹脂[三井・デュポンポリケミカル(株)製、商品名:エバフレックスV5961、酢酸ビニル単位含有量9質量%]をT-ダイ押出機を用いて、90μmの厚みに製膜し、粘着剤を塗布する側にコロナ処理を施した。得られたフィルムの厚みバラツキは±1.5%以内であった。
以下の実施例及び比較例中の「部」及び「%」は特に指定の無い限り、「質量部」及び「質量%」を表す。
得られた粘着剤主剤100部にエポキシ系架橋剤[ナガセケムテックス(株)製、商品名:デナコールEX-614B]0.5部とジエチレングリコールモノブチルエーテル2部を添加した後、10%アンモニア水を加えて粘度を3000mPa・s~5000mPa・sとして粘着剤塗布液を得た。
リップコーターを用いて、上記粘着剤塗布液をポリプロピレンフィルム(離型フィルム、厚み50μm)に塗布し、90℃で10分乾燥して厚み80μmの粘着剤層を設けた。これに前述のエチレン-酢酸ビニル共重合体フィルム(基材フィルム)のコロナ処理側を貼り合わせ押圧して、粘着剤を基材フィルムに積層した。積層後、40℃において120時間加熱した後、室温まで冷却することにより表面保護用粘着フィルムを作製した。各種特性値の測定及び評価結果を[表2]に示す。
粘着剤主剤の作製において、第一段目の乳化物を作製するための単量体混合物を[表1]のそれぞれの実施例の欄に記載してあるように変更した以外は実施例1と同様に表面保護用粘着フィルムを作製した。各種特性値の測定及び評価結果を[表2]に示す。
基材フィルムに160μmに製膜したエチレン-酢酸ビニル共重合体樹脂[三井・デュポンポリケミカル(株)製、商品名:エバフレックスV5961、酢酸ビニル単位含有量9%]を使用し、粘着剤層を45μm(乾燥時間5分)とすること以外は、実施例3と同様に表面保護用粘着フィルムを作製した。各種特性値の測定及び評価結果を[表2]に示す。
撹拌機、還流冷却機、温度計及び窒素ガス導入口を備えた重合容器に、脱イオン水500部を入れて窒素ガス置換し、70℃~72℃に昇温したのち、重合開始剤として過硫酸アンモウム(以下重合開始剤(1)と略す)5部、水溶性単量体としてポリオキシエチレンノニルフェニルエーテル(エチレンオキサイドの付加モル数の平均値:約20)硫酸エステルアンモニウム塩のベンゼン環に重合性の1-プロペニル基を付加させた化合物[第一工業製薬(株)製、商品名:アクアロンHS-10](以下水溶性単量体(1)と略す)0.15部を入れる。
粘着剤主剤の作製において、第一段目の重合体(A)の乳化物を作製するための単量体混合物を[表1]のそれぞれの比較例の欄に記載してあるように変更した以外は実施例1と同様に表面保護用粘着フィルムを作製した。各種特性値の測定及び評価結果を[表3]に示す。
撹拌機、還流冷却機、温度計及び窒素ガス導入口を備えた重合容器に、脱イオン水500部を入れて窒素ガス置換し、70℃~72℃に昇温したのち、重合開始剤として過硫酸アンモウム(以下重合開始剤(1)と略す)5部、水溶性単量体としてポリオキシエチレンノニルフェニルエーテル(エチレンオキサイドの付加モル数の平均値:約20)硫酸エステルアンモニウム塩のベンゼン環に重合性の1-プロペニル基を付加させた化合物[第一工業製薬(株)製、商品名:アクアロンHS-10](以下水溶性単量体(1)と略す)0.15部を入れる。
撹拌機、還流冷却機、温度計及び窒素ガス導入口を備えた重合容器に、脱イオン水135部を入れて窒素ガス置換し、70℃~72℃に昇温したのち、重合開始剤として4,4’-アゾビス-4-シアノバレリックアシッド[大塚化学(株)製、商品名:ACVA]0.5部、アクリル酸2-エチルヘキシル94部、メタクリル酸2部、アクリルアミド1部、n-ドデシルメルカプタン0.1部、水溶性単量体としてポリオキシエチレンノニルフェニルエーテル(エチレンオキサイドの付加モル数の平均値:約20)硫酸エステルアンモニウム塩のベンゼン環に重合性の1-プロペニル基を付加させた化合物[第一工業製薬(株)製、商品名:アクアロンHS-10]0.75部を入れる。9時間反応させ、アクリル系樹脂エマルションを得た。これを14%アンモニア水で中和(pH=7.0)し、固形分40.0%のアクリル系重合体とした。
n-BA:アクリル酸n-ブチル
AN:アクリロニトリル
AA:アクリル酸
AM:アクリルアミド
2EHA:2-エチルヘキシルアクリレート
本明細書に記載された全ての文献、特許出願、及び技術規格は、個々の文献、特許出願、及び技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
Claims (7)
- 基材フィルムと、
前記基材フィルムの片表面に粘着剤層と、を有し、
前記粘着剤層が、動的粘弾性のtanδが最大となる温度(Ta)が0℃を超える重合体(A)と、動的粘弾性のtanδが最大となる温度(Tb)が0℃以下である重合体(B)とを、質量比(A/B):57/43~90/10で含有し、
前記重合体(A)が、アクリロニトリル又はメタアクリロニトリルに由来する構造単位を22質量%~30質量%含む、
剥離速度10mm/minでの粘着力が1.0N/25mm以上の半導体ウェハ表面保護用粘着フィルム。 - 剥離速度10mm/min~1000mm/minにおける粘着力が、4.0N/25mm以下である、請求項1に記載の半導体ウェハ表面保護用粘着フィルム。
- 前記基材フィルムが、エチレン-酢酸ビニル共重合体層、ポリオレフィン層及びポリエステル層から選択される少なくとも1種の層を含む、請求項1又は請求項2に記載の半導体ウェハ表面保護用粘着フィルム。
- 前記重合体(A)及び前記重合体(B)の一方を形成するための原料モノマーを含有する第一重合用材料を反応容器に供給して重合を開始させる第一の重合工程と、
第一の重合工程の後に、前記重合体(A)及び前記重合体(B)の他方を形成するための原料モノマーを含有する第二重合用材料を前記反応容器にさらに供給して重合させる第二の重合工程と、を含む方法により得られる前記重合体(A)及び前記重合体(B)を含有する液を用いて前記粘着剤層が形成されてなる、請求項1~請求項3のいずれか1項に記載の半導体ウェハ表面保護用粘着フィルム。 - 前記重合体(A)を含有する液と前記重合体(B)を含有する液とを混合した混合液を用いて前記粘着剤層が形成されてなる、請求項1~請求項3のいずれか1項に記載の半導体ウェハ表面保護用粘着フィルム。
- 半導体ウェハの回路形成面に、請求項1~請求項5のいずれか1項に記載の半導体ウェハ表面保護用粘着フィルムにおける粘着剤層が接するように貼着する貼着工程と、
前記半導体ウェハ表面保護用フィルムが貼着された前記半導体ウェハにおける回路非形成面を研削する研削工程と、
前記半導体ウェハ表面保護用粘着フィルムを前記半導体ウェハから剥離する剥離工程と、
を含む、半導体ウェハの保護方法。 - 半導体ウェハの回路形成面に、請求項1~請求項5のいずれか1項に記載の半導体ウェハ表面保護用粘着フィルムにおける粘着剤層が接するように貼着する貼着工程と、
前記半導体ウェハ表面保護用フィルムが貼着された前記半導体ウェハにおける回路非形成面を研削する研削工程と、
前記半導体ウェハ表面保護用粘着フィルムを前記半導体ウェハから剥離する剥離工程と、
を含む、半導体装置の製造方法。
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KR (1) | KR101891422B1 (ja) |
CN (1) | CN105981138B (ja) |
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Cited By (2)
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JP2018065933A (ja) * | 2016-10-19 | 2018-04-26 | 株式会社寺岡製作所 | 粘着テープ |
CN112802734A (zh) * | 2020-12-30 | 2021-05-14 | 长春长光圆辰微电子技术有限公司 | 硅片单侧膜淀积的方法 |
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JP6956492B2 (ja) * | 2017-02-02 | 2021-11-02 | 株式会社巴川製紙所 | 半導体装置製造用接着シート及びそれを用いた半導体装置の製造方法 |
CN113966372A (zh) * | 2019-06-03 | 2022-01-21 | 三井化学东赛璐株式会社 | 电子装置的制造方法 |
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- 2015-02-12 CN CN201580008260.6A patent/CN105981138B/zh active Active
- 2015-02-12 WO PCT/JP2015/053847 patent/WO2015122465A1/ja active Application Filing
- 2015-02-12 KR KR1020167022149A patent/KR101891422B1/ko active Active
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JP6121003B2 (ja) | 2017-04-26 |
JPWO2015122465A1 (ja) | 2017-03-30 |
TW201533210A (zh) | 2015-09-01 |
KR20160106752A (ko) | 2016-09-12 |
TWI669371B (zh) | 2019-08-21 |
CN105981138A (zh) | 2016-09-28 |
KR101891422B1 (ko) | 2018-08-23 |
CN105981138B (zh) | 2018-12-28 |
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