JP6967908B2 - A temperature-sensitive adhesive sheet and a method for manufacturing a wafer using the same. - Google Patents

A temperature-sensitive adhesive sheet and a method for manufacturing a wafer using the same. Download PDF

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JP6967908B2
JP6967908B2 JP2017153347A JP2017153347A JP6967908B2 JP 6967908 B2 JP6967908 B2 JP 6967908B2 JP 2017153347 A JP2017153347 A JP 2017153347A JP 2017153347 A JP2017153347 A JP 2017153347A JP 6967908 B2 JP6967908 B2 JP 6967908B2
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temperature
adhesive layer
side chain
crystalline polymer
chain crystalline
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JP2018044148A (en
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幸志 山下
博行 山田
伸一郎 河原
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00Adhesives 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
    • C09J133/04Homopolymers or copolymers of esters
    • C09J133/06Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08Homopolymers or copolymers of acrylic acid esters
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    • C09J7/00Adhesives in the form of films or foils
    • C09J7/20Adhesives in the form of films or foils characterised by their carriers
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/32Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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    • C09J9/00Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C09J9/02Electrically-conducting adhesives
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67Apparatus 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
    • H01L21/683Apparatus 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
    • H01L21/6835Apparatus 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
    • H01L21/6836Wafer tapes, e.g. grinding or dicing support tapes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/77Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
    • H01L21/78Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/26Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L24/27Manufacturing methods
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/26Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L24/28Structure, shape, material or disposition of the layer connectors prior to the connecting process
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00Characterised by the use 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; Derivatives of such polymers
    • C08J2333/04Characterised by the use 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; Derivatives of such polymers esters
    • C08J2333/06Characterised by the use 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; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2333/08Homopolymers or copolymers of acrylic acid esters
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    • C09J2203/00Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326Applications 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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    • C09J2301/00Additional features of adhesives in the form of films or foils
    • C09J2301/10Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C09J2301/1242Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
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    • C09J2301/00Additional features of adhesives in the form of films or foils
    • C09J2301/30Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
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    • C09J2301/00Additional features of adhesives in the form of films or foils
    • C09J2301/30Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312Additional 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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    • C09J2301/00Additional features of adhesives in the form of films or foils
    • C09J2301/30Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/314Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive layer and/or the carrier being conductive
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    • C09J2301/00Additional features of adhesives in the form of films or foils
    • C09J2301/40Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/412Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of microspheres
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    • C09J2467/00Presence of polyester
    • C09J2467/006Presence of polyester in the substrate
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2221/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
    • H01L2221/67Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
    • H01L2221/683Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus 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
    • H01L2221/68304Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus 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
    • H01L2221/68327Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus 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 used during dicing or grinding

Description

本発明は、例えば、パターン付きウエハを製造する際にウエハを仮保持するために使用される感温性粘着シートおよびこれを用いるウエハの製造方法に関する。 The present invention relates to, for example, a temperature-sensitive pressure-sensitive adhesive sheet used for temporarily holding a wafer when manufacturing a patterned wafer, and a method for manufacturing a wafer using the same.

ウエハは、半導体素子製造の材料であり、シリコン、サファイア、シリコンカーバイド等の素材で作られた円柱状のインゴットを、薄くスライスした円盤状の板である。ウエハの製造では、ウエハを台座(支持基板)上に粘着シートを使用して接着し、ついで研削・研磨を行ってウエハを所定厚みに調整した後、ウエハを粘着シートと共に台座から剥離させ、ついでウエハから粘着シートを剥離させる。 A wafer is a material for manufacturing semiconductor devices, and is a disk-shaped plate obtained by thinly slicing a columnar ingot made of a material such as silicon, sapphire, or silicon carbide. In wafer manufacturing, a wafer is adhered to a pedestal (support substrate) using an adhesive sheet, then ground and polished to adjust the wafer to a predetermined thickness, and then the wafer is peeled off from the pedestal together with the adhesive sheet, and then The adhesive sheet is peeled off from the wafer.

ウエハを研削・研磨するには、ウエハが台座にしっかりと保持されていることが必要である。ウエハの保持が充分でないと、研削・研磨時にウエハがずれるおそれがある。また、薄膜化されたウエハは脆弱であるため、ウエハが台座にしっかりと保持されていないと、研削や研磨時の振動等の影響でウエハが割れるおそれがある。
また、ウエハから粘着シートを剥離させる際には、ウエハ表面に粘着剤の残渣が付着していないことが要求される。
In order to grind and polish a wafer, it is necessary that the wafer is firmly held on the pedestal. If the wafer is not sufficiently held, the wafer may shift during grinding and polishing. Further, since the thin-film wafer is fragile, if the wafer is not firmly held on the pedestal, the wafer may be cracked due to the influence of vibration during grinding or polishing.
Further, when the pressure-sensitive adhesive sheet is peeled off from the wafer, it is required that no residue of the pressure-sensitive adhesive adheres to the surface of the wafer.

特許文献1には、精密研削・研磨工程に使用するための粘着シートが記載されている。この粘着シートは、側鎖結晶性ポリマーと、発泡剤とを含有し、側鎖結晶性ポリマーは、融点未満の温度で結晶化しかつ融点以上の温度で流動性を示し、前記融点以上かつ発泡剤の発泡温度未満の温度で貼着した被着体を、側鎖結晶性ポリマーの融点未満の温度で固定し、前記発泡剤の発泡温度以上の温度で取り外すようにしたものである。 Patent Document 1 describes an adhesive sheet for use in a precision grinding / polishing process. This pressure-sensitive adhesive sheet contains a side-chain crystalline polymer and a foaming agent, and the side-chain crystalline polymer crystallizes at a temperature below the melting point and exhibits fluidity at a temperature above the melting point, and is above the melting point and the foaming agent. The adherend attached at a temperature lower than the foaming temperature of the above was fixed at a temperature lower than the melting point of the side chain crystalline polymer, and removed at a temperature higher than the foaming temperature of the foaming agent.

また、特許文献2には仮固定用両面粘着テープが記載されている。この仮固定用両面粘着テープは、基材の片面に台座に貼着するための第1粘着層を有し、他面にウエハに貼着するための第2粘着層を有している。第1粘着層は、感圧性接着剤、側鎖結晶性ポリマーおよび発泡剤を含有し、側鎖結晶性ポリマーの融点以上の温度で粘着力が低下する。第2粘着層は、感圧性接着剤および側鎖結晶性ポリマーを含有し、側鎖結晶性ポリマーの融点以上の温度で粘着力が低下する。
特許文献2に記載の両面粘着テープは、台座からの剥離時に、第1粘着層を、側鎖結晶性ポリマーの融点以上で、発泡剤が膨張ないし発泡する温度以上に加熱することにより、台座に対する粘着力が低下するようにしたものである。そして、台座から、ウエハを粘着テープと一緒に剥離させた後、第2粘着層を、側鎖結晶性ポリマーの融点以上の温度に加熱して、第2粘着層のウエハに対する粘着力を低下させ、ウエハから粘着テープを剥離させる。
Further, Patent Document 2 describes a double-sided adhesive tape for temporary fixing. This double-sided adhesive tape for temporary fixing has a first adhesive layer for attaching to a pedestal on one side of a base material, and a second adhesive layer for attaching to a wafer on the other surface. The first adhesive layer contains a pressure-sensitive adhesive, a side chain crystalline polymer and a foaming agent, and the adhesive strength decreases at a temperature equal to or higher than the melting point of the side chain crystalline polymer. The second adhesive layer contains a pressure-sensitive adhesive and a side-chain crystalline polymer, and the adhesive strength decreases at a temperature equal to or higher than the melting point of the side-chain crystalline polymer.
The double-sided adhesive tape described in Patent Document 2 is applied to the pedestal by heating the first adhesive layer to a temperature equal to or higher than the melting point of the side chain crystalline polymer and a temperature at which the foaming agent expands or foams when peeled from the pedestal. The adhesive strength is reduced. Then, after the wafer is peeled off from the pedestal together with the adhesive tape, the second adhesive layer is heated to a temperature equal to or higher than the melting point of the side chain crystalline polymer to reduce the adhesive force of the second adhesive layer on the wafer. , Peel off the adhesive tape from the wafer.

しかし、研削・研磨の加工時にはウエハを台座にしっかりと保持することができ、ずれや割れがない加工保持性と、研削・研磨後に粘着テープを剥離したウエハの表面に粘着剤の残渣が付着していない残渣レス性とを確実に両立させることができる粘着シートの提供が要望されていた。
特に、エピタキシャル・ウエハのように表面に凹凸状のパターンを有するウエハでは、パターン内に流動化した粘着剤が浸入するために、粘着剤の残渣が残らないようにウエハを剥離することが重要である。
However, the wafer can be firmly held on the pedestal during grinding / polishing, and the adhesive residue adheres to the surface of the wafer from which the adhesive tape has been peeled off after grinding / polishing. There has been a demand for the provision of an adhesive sheet that can surely achieve both the residue-less property and the residue-less property.
In particular, in a wafer having an uneven pattern on the surface such as an epitaxial wafer, it is important to peel off the wafer so that the adhesive residue does not remain because the fluidized adhesive infiltrates into the pattern. be.

特許第5623125号公報Japanese Patent No. 5623125 特開2015−183162号公報Japanese Unexamined Patent Publication No. 2015-183162

本発明は、表面にパターンを有するウエハのような被加工物であっても、ずれや割れなく強固に保持でき、かつ剥離時には残渣残りが低減した感温性粘着シートおよびこれを用いるウエハの製造方法を提供することを目的とする。 INDUSTRIAL APPLICABILITY The present invention provides a temperature-sensitive pressure-sensitive adhesive sheet that can firmly hold a workpiece such as a wafer having a pattern on the surface without slippage or cracking and has a reduced residual residue at the time of peeling, and a wafer using the same. The purpose is to provide a method.

本発明者らは、前記課題を解決すべく鋭意研究を重ねた結果、本発明を完成するに至った。すなわち、本発明は以下の構成からなる。
(1)フィルム状の基材と、前記基材の片面に積層されており台座に貼り付ける第1粘着層と、前記基材の他面に積層されており被加工物に貼り付ける第2粘着層とを備え、前記第1粘着層は、第1側鎖結晶性ポリマーおよび発泡剤を含有するとともに、前記第1側鎖結晶性ポリマーの融点以上の温度で流動性を示し、第1側鎖結晶性ポリマーの融点は発泡剤の発泡温度未満であると共に、前記第2粘着層は、第2側鎖結晶性ポリマーを含有するとともに、前記第2側鎖結晶性ポリマーの融点以上の温度で流動性を示す感温性粘着シート。
(2)前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーの融点未満において、前記第1粘着層および第2粘着層の貯蔵弾性率がいずれも1×106〜1×108Paである(1)に記載の感温性粘着シート。
(3)前記第2粘着層の貯蔵弾性率が、前記第1粘着層の貯蔵弾性率よりも大きい(2)に記載の感温性粘着シート
(4)前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーの融点がいずれも30℃〜70℃の発泡開始温度未満である(1)〜(3)のいずれかに記載の感温性粘着シート。
(5)前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーは、炭素数16以上の直鎖状アルキル基を有するアクリル酸エステルまたはメタクリル酸エステル30〜70質量部と、炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを30〜70質量部と、極性モノマー1〜10質量部とを重合させて得られる重合体である(1)〜(4)のいずれかに記載の感温性粘着シート。
(6)前記第2側鎖結晶性ポリマーは、炭素数16以上の直鎖状アルキル基を有するアクリル酸エステルまたはメタクリル酸エステル30〜70質量部と、炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを30〜70質量部と、極性モノマー1〜10質量部を重合させて得られる重合体であり、前記炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルが、当該エステルの総量に対して炭素数1または2のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを2〜70質量%含む(5)に記載の感温性粘着シート。
(7)融点以上かつ前記発泡剤温度未満の温度を経た後の融点未満の前記第1粘着層における前記基材に対する剥離強度が0.5〜5.0N/25mmであり、融点以上かつ前記発泡剤温度未満の温度を経た後の融点未満の前記第2粘着層における前記基材に対する剥離強度が0.1〜3.0N/25mmである(1)〜(6)のいずれかに記載の感温性粘着シート。
(8)前記第2粘着層の剥離強度が、前記第1粘着層の剥離強度よりも小さい(7)に記載の感温性粘着シート。
(9)上記(1)〜(8)のいずれかに記載の感温性粘着シートを用いて、前記感温性粘着シートの第1粘着層を前記第1側鎖結晶性ポリマーの融点以上で発泡開始温度未満の温度で台座に貼り付け、かつ第2粘着層を前記第2側鎖結晶性ポリマーの融点以上の温度でパターン付きウエハの凹凸状パターン面に貼り付ける工程と、前記パターン付きウエハの前記台座に貼り合せた面とは反対側の面を研削および/または研磨する工程と、前記感温性粘着シートの温度を前記発泡剤の発泡開始温度以上にし、前記台座から前記感温性粘着シートおよび前記パターン付きウエハを剥離する工程と、前記粘着シートの温度を前記第2側鎖結晶性ポリマーの融点以上にし、前記ウエハから粘着シートを剥離する工程と、を含むパターン付きウエハの製造方法。
The present inventors have completed the present invention as a result of repeated diligent studies to solve the above problems. That is, the present invention has the following configuration.
(1) A film-like base material, a first adhesive layer laminated on one side of the base material and attached to a pedestal, and a second adhesive layer laminated on the other surface of the base material and attached to a work piece. The first adhesive layer contains a first side chain crystalline polymer and a foaming agent, and exhibits fluidity at a temperature equal to or higher than the melting point of the first side chain crystalline polymer. The melting point of the crystalline polymer is lower than the foaming temperature of the foaming agent, and the second adhesive layer contains the second side chain crystalline polymer and flows at a temperature equal to or higher than the melting point of the second side chain crystalline polymer. A temperature-sensitive adhesive sheet that shows sex.
(2) The storage elastic moduli of the first adhesive layer and the second adhesive layer are both 1 × 10 6 to 1 × 10 at a temperature lower than the melting point of the first side chain crystalline polymer and the second side chain crystalline polymer. The temperature-sensitive adhesive sheet according to (1), which is 8 Pa.
(3) The temperature-sensitive pressure-sensitive adhesive sheet according to (2), wherein the storage elastic modulus of the second adhesive layer is larger than the storage elastic modulus of the first adhesive layer (4) The first side chain crystalline polymer and the above. The temperature-sensitive pressure-sensitive adhesive sheet according to any one of (1) to (3), wherein the melting point of the second side chain crystalline polymer is lower than the foaming start temperature of 30 ° C to 70 ° C.
(5) The first side chain crystalline polymer and the second side chain crystalline polymer have 30 to 70 parts by mass of an acrylic acid ester or a methacrylate ester having a linear alkyl group having 16 or more carbon atoms and a carbon number of carbon atoms. Any of (1) to (4), which is a polymer obtained by polymerizing 30 to 70 parts by mass of an acrylic acid ester or a methacrylate ester having an alkyl group of 1 to 6 and 1 to 10 parts by mass of a polar monomer. The temperature-sensitive adhesive sheet described in Crab.
(6) The second side chain crystalline polymer is an acrylic acid ester having a linear alkyl group having 16 or more carbon atoms or an acrylic ester having 30 to 70 parts by mass of a methacrylic acid ester, and an acrylic having an alkyl group having 1 to 6 carbon atoms. It is a polymer obtained by polymerizing 30 to 70 parts by mass of an acid ester or a methacrylic acid ester and 1 to 10 parts by mass of a polar monomer, and is an acrylic acid ester or a methacrylic acid ester having an alkyl group having 1 to 6 carbon atoms. However, the temperature-sensitive pressure-sensitive adhesive sheet according to (5), which contains 2 to 70% by mass of an acrylic acid ester or a methacrylic acid ester having an alkyl group having 1 or 2 carbon atoms with respect to the total amount of the ester.
(7) The peel strength of the first adhesive layer of the first adhesive layer, which is equal to or higher than the melting point and lower than the melting point after passing through the temperature of the foaming agent, is 0.5 to 5.0 N / 25 mm, and is equal to or higher than the melting point and lower than the foaming agent. The feeling according to any one of (1) to (6), wherein the peeling strength of the second adhesive layer having a melting point of less than the melting point after passing through a temperature lower than the agent temperature is 0.1 to 3.0 N / 25 mm. Warm adhesive sheet.
(8) The temperature-sensitive adhesive sheet according to (7), wherein the peel strength of the second adhesive layer is smaller than the peel strength of the first adhesive layer.
(9) Using the temperature-sensitive pressure-sensitive adhesive sheet according to any one of (1) to (8) above, the first pressure-sensitive adhesive layer of the temperature-sensitive pressure-sensitive adhesive sheet is placed at a temperature equal to or higher than the melting point of the first side-chain crystalline polymer. A step of attaching the second adhesive layer to the pedestal at a temperature lower than the foaming start temperature and attaching the second adhesive layer to the uneven patterned surface of the patterned wafer at a temperature equal to or higher than the melting point of the second side chain crystalline polymer, and the patterned wafer. In the step of grinding and / or polishing the surface opposite to the surface bonded to the pedestal, and the temperature of the temperature-sensitive adhesive sheet is set to the foaming start temperature of the foaming agent or higher, and the temperature-sensitive property from the pedestal. Manufacture of a patterned wafer including a step of peeling the pressure-sensitive adhesive sheet and the patterned wafer, and a step of raising the temperature of the pressure-sensitive adhesive sheet to a temperature equal to or higher than the melting point of the second side chain crystalline polymer and peeling the pressure-sensitive adhesive sheet from the wafer. Method.

本発明の感温性粘着シートは、表面に凹凸状のパターンを有するウエハのような被加工物であっても、ずれや割れなく強固に保持でき、かつ剥離時には被加工物の表面に粘着シートの残渣残りを低減できるという効果がある。従って、本発明の感温性粘着シートは、凹凸状のパターン付きウエハを製造するのに好適である。 The temperature-sensitive adhesive sheet of the present invention can firmly hold a workpiece such as a wafer having an uneven pattern on the surface without slippage or cracking, and the adhesive sheet is attached to the surface of the workpiece at the time of peeling. It has the effect of reducing the residual residue of the wafer. Therefore, the temperature-sensitive pressure-sensitive adhesive sheet of the present invention is suitable for producing a wafer with an uneven pattern.

本発明の感温性粘着シートの一実施形態を示す概略説明図である。It is a schematic explanatory drawing which shows one Embodiment of the temperature-sensitive adhesive sheet of this invention. (a)〜(e)は、本発明の一実施形態に係るパターン付きウエハの製造方法を示す工程図である。(A) to (e) are process diagrams showing a method for manufacturing a patterned wafer according to an embodiment of the present invention.

<感温性粘着シート>
以下、本発明の一実施形態に係る感温性粘着シート(以下、単に粘着シートということがある。)について、図1を参照して詳細に説明する。
図1に示すように、本実施形態のテープ1は、基材2と、基材2の片面に積層されている第1粘着層3と、基材2の他面に積層されている第2粘着層4と、を備えている。第1粘着層3および第2粘着層4の表面には、それぞれ離型性を有するセパレータ5a、5bが配置されている。
<Temperature-sensitive adhesive sheet>
Hereinafter, the temperature-sensitive adhesive sheet (hereinafter, may be simply referred to as an adhesive sheet) according to an embodiment of the present invention will be described in detail with reference to FIG.
As shown in FIG. 1, the tape 1 of the present embodiment has a base material 2, a first adhesive layer 3 laminated on one side of the base material 2, and a second laminated surface on the other side of the base material 2. The adhesive layer 4 is provided. Separators 5a and 5b having releasability are arranged on the surfaces of the first adhesive layer 3 and the second adhesive layer 4, respectively.

(基材2)
本実施形態の基材2は、フィルム状である。フィルム状とは、フィルムのみに限定されるものではなく、本実施形態の効果を損なわない限りにおいて、フィルムないしシートをも含む概念である。
(Base material 2)
The base material 2 of the present embodiment is in the form of a film. The film form is not limited to a film, but is a concept including a film or a sheet as long as the effect of the present embodiment is not impaired.

基材2の構成材料としては、例えばポリエチレン、ポリエチレンテレフタレート、ポリプロピレン、ポリエステル、ポリアミド、ポリイミド、ポリカーボネート、エチレン酢酸ビニル共重合体、エチレンエチルアクリレート共重合体、エチレンポリプロピレン共重合体、ポリ塩化ビニル等の合成樹脂が挙げられる。 Examples of the constituent materials of the base material 2 include polyethylene, polyethylene terephthalate, polypropylene, polyester, polyamide, polyimide, polycarbonate, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, ethylene polypropylene copolymer, polyvinyl chloride and the like. Examples include synthetic resin.

本実施形態の基材2は、単層体または複層体のいずれであってもよく、その厚さとしては、5〜250μmであるのが好ましく、12〜188μmであるのがより好ましく、25〜100μmであるのがさらに好ましい。基材2の片面21および他面22には、第1粘着層3および第2粘着層4に対する密着性を高める上で、例えばコロナ放電処理、プラズマ処理、ブラスト処理、ケミカルエッチング処理、プライマー処理等の表面処理を施すことができる。 The base material 2 of the present embodiment may be either a single layer body or a multi-layer body, and the thickness thereof is preferably 5 to 250 μm, more preferably 12 to 188 μm, and 25. It is more preferably ~ 100 μm. On one side 21 and the other side 22 of the base material 2, for example, corona discharge treatment, plasma treatment, blast treatment, chemical etching treatment, primer treatment, etc. are performed in order to improve the adhesion to the first adhesive layer 3 and the second adhesive layer 4. Surface treatment can be applied.

(第1粘着層3)
基材2の片面に積層されている第1粘着層3は、台座に貼り付けられる層であり、第1側鎖結晶性ポリマーおよび発泡剤を含有する。
(First adhesive layer 3)
The first adhesive layer 3 laminated on one side of the base material 2 is a layer to be attached to the pedestal, and contains a first side chain crystalline polymer and a foaming agent.

第1側鎖結晶性ポリマーは、融点を有するポリマーである。融点とは、ある平衡プロセスにより、最初は秩序ある配列に整合されていた重合体の特定部分が無秩序状態になる温度であり、示差熱走査熱量計(DSC)によって10℃/分の測定条件で測定して得られる値のことを意味するものとする。第1側鎖結晶性ポリマーの融点は、発泡剤の発泡温度未満で、30〜70℃、好ましくは40〜60℃であるのが好ましい。 The first side chain crystalline polymer is a polymer having a melting point. The melting point is the temperature at which a specific portion of the polymer initially matched to an ordered sequence becomes disordered by a certain equilibrium process, under the conditions of 10 ° C./min by a differential thermal scanning calorimeter (DSC). It shall mean the value obtained by measurement. The melting point of the first side chain crystalline polymer is preferably 30 to 70 ° C., preferably 40 to 60 ° C., below the foaming temperature of the foaming agent.

第1側鎖結晶性ポリマーは、上述した融点未満の温度で結晶化し、且つ融点以上の温度では相転位して流動性を示す。すなわち、第1側鎖結晶性ポリマーは、温度変化に対応して結晶状態と流動状態とを可逆的に起こす感温性を有する。 The first side chain crystalline polymer crystallizes at a temperature below the melting point described above, and undergoes phase shift at a temperature above the melting point to exhibit fluidity. That is, the first side chain crystalline polymer has a temperature sensitivity that reversibly causes a crystalline state and a flowing state in response to a temperature change.

本実施形態における第1粘着層3は、第1側鎖結晶性ポリマーを主成分として含有し、発泡剤を第1側鎖結晶性ポリマー100質量部に対して10〜110質量部、好ましくは20〜80質量部、より好ましくは40〜60質量部の割合で含有する。これにより、前記融点以上かつ発泡剤の発泡温度未満の温度では、流動性を示す第1側鎖結晶性ポリマーによって粘着シートが粘着力を発現するようになるので、台座に貼着することが可能になる。 The first adhesive layer 3 in the present embodiment contains the first side chain crystalline polymer as a main component, and contains a foaming agent in an amount of 10 to 110 parts by mass, preferably 20 parts by mass, based on 100 parts by mass of the first side chain crystalline polymer. It is contained in an amount of about 80 parts by mass, more preferably 40 to 60 parts by mass. As a result, at a temperature equal to or higher than the melting point and lower than the foaming temperature of the foaming agent, the pressure-sensitive adhesive sheet exhibits adhesive strength due to the first side chain crystalline polymer exhibiting fluidity, so that it can be attached to the pedestal. become.

また、粘着シートが台座表面に存在する微細な凹凸や空隙内に隙間なく侵入するようになる。この状態の粘着シートを前記融点未満の温度に冷却すると、側鎖結晶性ポリマーが結晶化することによってアンカー効果が発現し、それゆえ高い固定力が得られる。しかも、結晶化した側鎖結晶性ポリマーを含む粘着シートは高い弾性率を示すので、台座の固定状態を安定させることができ、後述する第2粘着層4に被着される被加工物を精度よく加工することができる。 In addition, the adhesive sheet will penetrate into the fine irregularities and voids existing on the surface of the pedestal without any gaps. When the pressure-sensitive adhesive sheet in this state is cooled to a temperature lower than the melting point, the side-chain crystalline polymer crystallizes to exhibit an anchor effect, and therefore a high fixing force can be obtained. Moreover, since the pressure-sensitive adhesive sheet containing the crystallized side-chain crystalline polymer exhibits a high elastic modulus, the fixed state of the pedestal can be stabilized, and the workpiece to be adhered to the second pressure-sensitive adhesive layer 4, which will be described later, can be accurately measured. Can be processed well.

さらに、粘着シートを発泡剤の発泡温度以上の温度に加熱すると、第1側鎖結晶性ポリマーが流動性を示すことによって粘着シートの凝集力が低下するとともに、発泡剤も膨張ないし発泡するので、前記固定力を十分に低下させることができ、台座から粘着シートを簡単に取り外すことができる。したがって、本実施形態の粘着シートは、前記融点以上かつ発泡剤の発泡温度未満の温度で台座に貼着し、前記融点未満の温度で固定し、発泡剤の発泡温度以上の温度で取り外す粘着シートとして使用することができる。 Further, when the pressure-sensitive adhesive sheet is heated to a temperature higher than the foaming temperature of the foaming agent, the first side chain crystalline polymer exhibits fluidity, so that the cohesive force of the pressure-sensitive adhesive sheet decreases and the foaming agent also expands or foams. The fixing force can be sufficiently reduced, and the adhesive sheet can be easily removed from the pedestal. Therefore, the pressure-sensitive adhesive sheet of the present embodiment is attached to the pedestal at a temperature equal to or higher than the melting point and lower than the foaming temperature of the foaming agent, fixed at a temperature lower than the melting point, and removed at a temperature equal to or higher than the foaming temperature of the foaming agent. Can be used as.

上述した融点は、第1側鎖結晶性ポリマーの組成等を変えることによって調整することができる。第1側鎖結晶性ポリマーの組成としては、例えば炭素数16以上、好ましくは18以上の直鎖状アルキル基を有する(メタ)アクリレート30〜70質量部と、炭素数1〜6のアルキル基を有する(メタ)アクリレート30〜70質量部と、極性モノマー1〜10質量部と、を重合させて得られる重合体等が挙げられる。(メタ)アクリレートは、アクリル酸エステルまたはメタクリル酸エステルを意味する。 The melting point described above can be adjusted by changing the composition of the first side chain crystalline polymer and the like. The composition of the first side chain crystalline polymer includes, for example, 30 to 70 parts by mass of a (meth) acrylate having a linear alkyl group having 16 or more carbon atoms, preferably 18 or more carbon atoms, and an alkyl group having 1 to 6 carbon atoms. Examples thereof include a polymer obtained by polymerizing 30 to 70 parts by mass of a (meth) acrylate having and 1 to 10 parts by mass of a polar monomer. (Meta) acrylate means acrylic acid ester or methacrylic acid ester.

炭素数16以上の直鎖状アルキル基を有する(メタ)アクリレートとしては、例えばセチル(メタ)アクリレート、ステアリル(メタ)アクリレート、エイコシル(メタ)アクリレート、ベヘニル(メタ)アクリレート等の炭素数16〜22の線状アルキル基を有する(メタ)アクリレートが挙げられ、炭素数1〜6のアルキル基を有する(メタ)アクリレートとしては、例えばメチル(メタ)アクリレート、エチル(メタ)アクリレート、ブチル(メタ)アクリレート、ヘキシル(メタ)アクリレート等が挙げられ、極性モノマーとしては、例えばアクリル酸、メタクリル酸、クロトン酸、イタコン酸、マレイン酸、フマル酸等のカルボキシル基を有するエチレン不飽和単量体;2−ヒドロキシエチル(メタ)アクリレート、2−ヒドロキシプロピル(メタ)アクリレート、2−ヒドロキシヘキシル(メタ)アクリレート等のヒドロキシル基を有するエチレン不飽和単量体等が挙げられ、これらは1種または2種以上を混合して用いてもよい。 Examples of the (meth) acrylate having a linear alkyl group having 16 or more carbon atoms include cetyl (meth) acrylate, stearyl (meth) acrylate, eicocil (meth) acrylate, and behenyl (meth) acrylate, which have 16 to 22 carbon atoms. Examples of the (meth) acrylate having an alkyl group having 1 to 6 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate. , Hexyl (meth) acrylate and the like, and examples of the polar monomer include ethylene unsaturated monomers having a carboxyl group such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid and fumaric acid; 2-hydroxy. Examples thereof include ethylene unsaturated monomers having a hydroxyl group such as ethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxyhexyl (meth) acrylate, and these include one kind or a mixture of two or more kinds. May be used.

第1側鎖結晶性ポリマーの重合方法としては、特に限定されるものではなく、例えば溶液重合法、塊状重合法、懸濁重合法、乳化重合法等が採用可能である。例えば溶液重合法を採用する場合には、前記で例示したモノマーを溶剤に混合し、40〜90℃程度で2〜10時間程度攪拌することによって前記モノマーを重合させることができる。 The polymerization method of the first side chain crystalline polymer is not particularly limited, and for example, a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method and the like can be adopted. For example, when the solution polymerization method is adopted, the monomer can be polymerized by mixing the monomer exemplified above with a solvent and stirring at about 40 to 90 ° C. for about 2 to 10 hours.

第1側鎖結晶性ポリマーの重量平均分子量としては、200,000〜1,000,000であるのが好ましく、300,000〜900,000であるのがより好ましく、400,000〜800,000であるのがさらに好ましい。これにより、粘着テープ1を台座から剥離したときに糊残りが発生するのを抑制することができる。また、第1側鎖結晶性ポリマーが融点以上の温度で流動性を示したときに、第1粘着層3の粘着力を十分に低下させることができる。重量平均分子量は、第1側鎖結晶性ポリマーをゲルパーミエーションクロマトグラフィ(GPC)によって測定し、得られた測定値をポリスチレン換算した値である。 The weight average molecular weight of the first side chain crystalline polymer is preferably 200,000 to 1,000,000, more preferably 300,000 to 900,000, and 400,000 to 800,000. Is more preferable. This makes it possible to prevent the adhesive residue from being generated when the adhesive tape 1 is peeled off from the pedestal. Further, when the first side chain crystalline polymer exhibits fluidity at a temperature equal to or higher than the melting point, the adhesive strength of the first adhesive layer 3 can be sufficiently reduced. The weight average molecular weight is a value obtained by measuring the first side chain crystalline polymer by gel permeation chromatography (GPC) and converting the obtained measured value into polystyrene.

一方、発泡剤としては、特に限定されるものではなく、通常の化学発泡剤、物理発泡剤がいずれも採用可能である。化学発泡剤には、熱分解型および反応型の有機系発泡剤ならびに無機系発泡剤が包含される。 On the other hand, the foaming agent is not particularly limited, and any ordinary chemical foaming agent or physical foaming agent can be adopted. Chemical foaming agents include pyrolytic and reactive organic foaming agents and inorganic foaming agents.

熱分解型の有機系発泡剤としては、例えば各種のアゾ化合物(アゾジカルボンアミド等)、ニトロソ化合物(N,N’−ジニトロソペンタメチレンテトラミン等)、ヒドラジン誘導体[4,4’−オキシビス(ベンゼンスルホニルヒドラジド)等]、セミカルバジド化合物(ヒドラゾジカルボンアミド等)、アジド化合物、テトラゾール化合物等が挙げられ、反応型の有機系発泡剤としては、例えばイソシアネート化合物等が挙げられる。 Examples of the heat-decomposable organic foaming agent include various azo compounds (azodicarbonamide, etc.), nitroso compounds (N, N'-dinitrosopentamethylenetetramine, etc.), and hydrazine derivatives [4,4'-oxybis (benzene). Sulfonylhydrazide), etc.], semicarbazide compounds (hydrazodicarbonamide, etc.), azide compounds, tetrazole compounds, etc., and examples of the reactive organic foaming agent include isocyanate compounds.

熱分解型の無機系発泡剤としては、例えば重炭酸塩・炭酸塩(炭酸水素ナトリウム等)、亜硝酸塩・水素化物等が挙げられ、反応型の無機系発泡剤としては、例えば重炭酸ナトリウムと酸との組み合わせ、過酸化水素とイースト菌との組み合わせ、亜鉛粉末と酸との組み合わせ等が挙げられる。 Examples of the heat-decomposable inorganic foaming agent include bicarbonate / carbonate (sodium hydrogencarbonate, etc.), nitrite / hydride, and the like, and examples of the reactive inorganic foaming agent include sodium bicarbonate. Examples include a combination with an acid, a combination of hydrogen carbonate and yeast, a combination of zinc powder and an acid, and the like.

物理発泡剤としては、例えばブタン、ペンタン、ヘキサン等の脂肪族炭化水素類、ジクロロエタン、ジクロロメタン等の塩化炭素水素類、フロン等のフッ化塩化炭化水素類等の有機系物理発泡剤、空気、炭酸ガス、窒素ガス等の無機系物理発泡剤等が挙げられる。 Examples of the physical foaming agent include aliphatic hydrocarbons such as butane, pentane and hexane, carbon chloride hydrogens such as dichloroethane and dichloromethane, organic physical foaming agents such as fluorinated hydrocarbons such as freon, air and carbon dioxide. Examples thereof include inorganic physical foaming agents such as gas and nitrogen gas.

また、他の発泡剤として、マイクロカプセル化された熱膨張性微粒子である、いわゆるマイクロバルーン発泡剤を採用することができる。マイクロバルーン発泡剤は、熱可塑性または熱硬化性樹脂によって構成されているポリマー殻の内部に、固体、液体または気体からなる加熱膨張性物質を封入したものである。言い換えれば、マイクロバルーン発泡剤は、マイクロオーダーの平均粒径を有する中空状のポリマー殻と、ポリマー殻の内部に封入されている加熱膨張性物質と、を備えるものである。マイクロバルーン発泡剤は加熱によって体積が40倍以上に膨張し、独立気泡形式の発泡体が得られる。したがって、マイクロバルーン発泡剤は、通常の発泡剤に比べて、発泡倍率がかなり大きくなるという特性を有する。このようなマイクロバルーン発泡剤は、市販のものを用いることができ、例えばEXPANCEL社製の「461DU20」、「551DU40」等が好適である。 Further, as another foaming agent, a so-called microballoon foaming agent, which is microencapsulated heat-expandable fine particles, can be adopted. The microballoon foaming agent is a polymer shell made of a thermoplastic or thermosetting resin in which a heat-expandable substance composed of a solid, a liquid or a gas is enclosed. In other words, the microballoon foaming agent comprises a hollow polymer shell having a micro-order average particle size and a heat-expandable substance encapsulated inside the polymer shell. The volume of the microballoon foaming agent expands 40 times or more by heating, and a closed cell type foam is obtained. Therefore, the microballoon foaming agent has a characteristic that the foaming ratio is considerably higher than that of a normal foaming agent. As such a microballoon foaming agent, a commercially available one can be used, and for example, "461DU20" and "551DU40" manufactured by EXPANCEL are suitable.

発泡剤が膨脹ないし発泡する温度は、第1側鎖結晶性ポリマーの融点よりも高い温度である。発泡剤が膨脹ないし発泡する温度としては、通常、180℃以下であるのが好ましく、例えば、90℃で膨脹ないし発泡を開始して120℃で実質的に完全に発泡させるようにするのが好ましい。 The temperature at which the foaming agent expands or foams is higher than the melting point of the first side chain crystalline polymer. The temperature at which the foaming agent expands or foams is usually preferably 180 ° C. or lower, for example, it is preferable to start expansion or foaming at 90 ° C. and substantially completely foam at 120 ° C. ..

発泡剤の平均粒径としては、5〜50μmであるのが好ましく、5〜20μmであるのがより好ましい。平均粒径は、粒度分布測定装置で測定して得られる値である。 The average particle size of the foaming agent is preferably 5 to 50 μm, more preferably 5 to 20 μm. The average particle size is a value obtained by measuring with a particle size distribution measuring device.

このような発泡剤とともに、第1側鎖結晶性ポリマーを含有する第1粘着層3を基材2の片面に積層するには、例えば第1側鎖結晶性ポリマーおよび発泡剤を溶剤に加えた塗布液を、コーター等によって基材2の片面に塗布して乾燥させればよい。コーターとしては、例えばナイフコーター、ロールコーター、カレンダーコーター、コンマコーター、グラビアコーター、ロッドコーター等が挙げられる。 In order to laminate the first pressure-sensitive adhesive layer 3 containing the first side chain crystalline polymer together with such a foaming agent on one side of the base material 2, for example, the first side chain crystalline polymer and the foaming agent were added to the solvent. The coating liquid may be applied to one side of the base material 2 with a coater or the like and dried. Examples of the coater include a knife coater, a roll coater, a calendar coater, a comma coater, a gravure coater, a rod coater and the like.

第1粘着層3の厚さとしては、10〜50μmであるのが好ましく、15〜45μmであるのがより好ましい。 The thickness of the first adhesive layer 3 is preferably 10 to 50 μm, more preferably 15 to 45 μm.

第1粘着層3には、例えば架橋剤、粘着付与剤、可塑剤、老化防止剤、紫外線吸収剤等の各種の添加剤を添加することができ、例示した添加剤のうち架橋剤を添加するのが好ましい。架橋剤としては、例えばイソシアネート化合物等が挙げられる。架橋剤は、固形分換算で第1側鎖結晶性ポリマー100質量部に対して0.1〜10質量部の割合で添加するのが好ましく、0.1〜5質量部の割合で添加するのがより好ましく、0.3〜3質量部の割合で添加するのがさらに好ましい。 Various additives such as a cross-linking agent, a tackifier, a plasticizer, an antiaging agent, and an ultraviolet absorber can be added to the first adhesive layer 3, and the cross-linking agent is added among the exemplified additives. Is preferable. Examples of the cross-linking agent include isocyanate compounds. The cross-linking agent is preferably added at a ratio of 0.1 to 10 parts by mass with respect to 100 parts by mass of the first side chain crystalline polymer in terms of solid content, and is added at a ratio of 0.1 to 5 parts by mass. Is more preferable, and it is further preferable to add in a ratio of 0.3 to 3 parts by mass.

上述した第1粘着層3における第1側鎖結晶性ポリマー、発泡剤および架橋剤の好ましい配合としては、質量比で、第1側鎖結晶性ポリマー:発泡剤:架橋剤=100:40〜60:0.3〜3になる比率が挙げられる。 The preferred formulation of the first side chain crystalline polymer, foaming agent and cross-linking agent in the first adhesive layer 3 described above is, in terms of mass ratio, first side chain crystalline polymer: foaming agent: cross-linking agent = 100: 40-60. : The ratio of 0.3 to 3 can be mentioned.

(第2粘着層)
基材2の他面に積層されている第2粘着層4は、被着体が被加工物であり、第2側鎖結晶性ポリマーを含有し、第2側鎖結晶性ポリマーの融点以上の温度で粘着力が低下する感温性粘着層である。
(Second adhesive layer)
The second adhesive layer 4 laminated on the other surface of the base material 2 has an adherend as a workpiece, contains a second side chain crystalline polymer, and has a temperature equal to or higher than the melting point of the second side chain crystalline polymer. It is a temperature-sensitive adhesive layer whose adhesive strength decreases with temperature.

第2側鎖結晶性ポリマーは、上述した第1側鎖結晶性ポリマーと同様に、その融点が30〜70℃、好ましくは40〜60℃である。すなわち、本実施形態では、第1側鎖結晶性ポリマーの融点および第2側鎖結晶性ポリマーの融点がいずれも、30〜70℃、好ましくは40〜60℃である。これにより、例えば被加工物を研磨時、第1,第2側鎖結晶性ポリマーはいずれも結晶状態を維持できることから、第1,第2粘着層3,4の粘着力を確保することができ、結果として研磨不良等の加工不良の発生を抑制することができる。 The second side chain crystalline polymer has a melting point of 30 to 70 ° C., preferably 40 to 60 ° C., like the first side chain crystalline polymer described above. That is, in the present embodiment, both the melting point of the first side chain crystalline polymer and the melting point of the second side chain crystalline polymer are 30 to 70 ° C., preferably 40 to 60 ° C. As a result, for example, when the workpiece is polished, the first and second side chain crystalline polymers can maintain their crystalline state, so that the adhesive strength of the first and second adhesive layers 3 and 4 can be ensured. As a result, it is possible to suppress the occurrence of processing defects such as polishing defects.

第2側鎖結晶性ポリマーの重量平均分子量は、200,000〜1,000,000であるのが好ましく、300,000〜900,000であるのがより好ましく、400,000〜800,000であるのがさらに好ましい。 The weight average molecular weight of the second side chain crystalline polymer is preferably 200,000 to 1,000,000, more preferably 300,000 to 900,000, and 400,000 to 800,000. It is even more preferable to have it.

第2側鎖結晶性ポリマーの融点、組成、重量平均分子量、配合量等は、上述した第1側鎖結晶性ポリマーと同じであってもよいし、異なっていてもよい。
すなわち、第2側鎖結晶性ポリマーは、第1側鎖結晶性ポリマーと同様に、炭素数16以上の直鎖状アルキル基を有するアクリル酸エステルまたはメタクリル酸エステル30〜70質量部と、炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを30〜70質量部と、極性モノマー1〜10質量部を重合させて得られる。
このとき、炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルは、当該エステルの総量に対して炭素数1または2のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを2〜70質量%含むのが好ましい。これにより、第2粘着層の粘着力が向上し、ウエハが剥がれにくく、かつ硬さが向上するので、第2粘着層がずれたり、変形したりするのを抑制することができ、ウエハの加工性が向上する。その他は上述した第1側鎖結晶性ポリマーと同様である。
なお、第1側鎖結晶性ポリマーは、第2側鎖結晶性ポリマーと同様に、総量に対して炭素数1または2のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを2〜70質量%含む組成であってもよい。
The melting point, composition, weight average molecular weight, blending amount, etc. of the second side chain crystalline polymer may be the same as or different from the above-mentioned first side chain crystalline polymer.
That is, the second side chain crystalline polymer, like the first side chain crystalline polymer, has 30 to 70 parts by mass of an acrylic acid ester or a methacrylate ester having a linear alkyl group having 16 or more carbon atoms and a carbon number of carbon atoms. It is obtained by polymerizing 30 to 70 parts by mass of an acrylic acid ester or a methacrylate ester having an alkyl group of 1 to 6 and 1 to 10 parts by mass of a polar monomer.
At this time, the acrylic acid ester or methacrylic acid ester having an alkyl group having 1 to 6 carbon atoms is an acrylic acid ester or methacrylic acid ester having an alkyl group having 1 or 2 carbon atoms with respect to the total amount of the ester. It is preferably contained in% by mass. As a result, the adhesive strength of the second adhesive layer is improved, the wafer is less likely to be peeled off, and the hardness is improved. Therefore, it is possible to suppress the second adhesive layer from being displaced or deformed, and the wafer can be processed. Improves sex. Others are the same as those of the first side chain crystalline polymer described above.
Similar to the second side chain crystalline polymer, the first side chain crystalline polymer contains 2 to 70% by mass of an acrylic acid ester or a methacrylic acid ester having an alkyl group having 1 or 2 carbon atoms with respect to the total amount. It may be a composition.

第2粘着層4の厚さは、前記した第1粘着層3の厚さと同様に、5〜50μm、好ましくは5〜20μmであるのがよい。その際、第2側鎖結晶性ポリマーを含有する第2粘着層4の厚さは、第1粘着層3の厚さと同じか、それよりも小さくてもよいが、ウエハ等の被加工物表面の凹凸に粘着剤を追従させ、被加工物を強固に固定するうえで、第1粘着層3の厚さよりも大きいのが好ましい。 The thickness of the second adhesive layer 4 is preferably 5 to 50 μm, preferably 5 to 20 μm, similar to the thickness of the first adhesive layer 3 described above. At that time, the thickness of the second adhesive layer 4 containing the second side chain crystalline polymer may be the same as or smaller than the thickness of the first adhesive layer 3, but the surface of the workpiece such as a wafer may be smaller. It is preferable that the thickness is larger than the thickness of the first adhesive layer 3 in order to make the adhesive follow the unevenness of the surface and firmly fix the workpiece.

なお、第2粘着層4には、第1粘着層3と同様に、架橋剤を添加するのが好ましい。架橋剤は、固形分換算で第2側鎖結晶性ポリマー100質量部に対して0.1〜10質量部の割合で添加するのが好ましく、0.1〜5質量部の割合で添加するのがより好ましく、0.3〜3質量部の割合で添加するのがさらに好ましい。
第2粘着層4のその他の構成は、上述した第1粘着層3と同様であるので、説明を省略する。
As in the case of the first adhesive layer 3, it is preferable to add a cross-linking agent to the second adhesive layer 4. The cross-linking agent is preferably added at a ratio of 0.1 to 10 parts by mass with respect to 100 parts by mass of the second side chain crystalline polymer in terms of solid content, and is added at a ratio of 0.1 to 5 parts by mass. Is more preferable, and it is further preferable to add in a ratio of 0.3 to 3 parts by mass.
Since the other configurations of the second adhesive layer 4 are the same as those of the first adhesive layer 3 described above, the description thereof will be omitted.

(第1粘着層3と第2粘着層4)
本実施形態における第1粘着層3および第2粘着層4は、前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーの融点未満(通常、23℃)において、貯蔵弾性率がいずれも1×106〜1×108Paである。これにより、被加工物の台座に対する固定状態を安定させることができ、被加工物を精度よく加工することができる。
(1st adhesive layer 3 and 2nd adhesive layer 4)
The first adhesive layer 3 and the second adhesive layer 4 in the present embodiment have a storage elastic modulus below the melting point of the first side chain crystalline polymer and the second side chain crystalline polymer (usually 23 ° C.). Also 1 × 10 6 to 1 × 10 8 Pa. As a result, the fixed state of the workpiece to the pedestal can be stabilized, and the workpiece can be machined with high accuracy.

その際、第2粘着層4の貯蔵弾性率は、第1粘着層3の貯蔵弾性率と同じか、それよりも小さくてもよいが、第1粘着層3の貯蔵弾性率よりも大きいのが好ましい。これにより、ウエハ等の被加工物の固定状態を安定させることができ、被加工物を精度よく加工することができる。
側鎖結晶性ポリマーの融点未満温度における貯蔵弾性率G’は、例えば側鎖結晶性ポリマーの組成等を変えることによって任意に調整することができる。各温度における貯蔵弾性率G’は、後述する実施例に記載の測定方法で測定して得られる値である。
At that time, the storage elastic modulus of the second adhesive layer 4 may be the same as or smaller than the storage elastic modulus of the first adhesive layer 3, but is larger than the storage elastic modulus of the first adhesive layer 3. preferable. As a result, the fixed state of the workpiece such as a wafer can be stabilized, and the workpiece can be processed with high accuracy.
The storage elastic modulus G'at a temperature below the melting point of the side chain crystalline polymer can be arbitrarily adjusted by changing, for example, the composition of the side chain crystalline polymer. The storage elastic modulus G'at each temperature is a value obtained by measuring by the measuring method described in Examples described later.

一方、第1粘着層3は、融点以上かつ前記発泡剤温度未満の温度を経た後の融点未満の状態におけるポリエチレンテレフタレートに対する剥離強度が0.5〜5.0N/25mmであるのがよい。これにより、台座に対する固定力を得ることができる。上記融点未満の状態における第1粘着層3の剥離強度は、23℃の雰囲気温度におけるポリエチレンテレフタレートフィルムに対する180°剥離強度をJIS Z0237に準じて測定して得られる値である。 On the other hand, the first adhesive layer 3 preferably has a peel strength of 0.5 to 5.0 N / 25 mm with respect to polyethylene terephthalate in a state of being above the melting point and below the melting point after passing through the temperature below the foaming agent temperature. Thereby, a fixing force for the pedestal can be obtained. The peel strength of the first adhesive layer 3 in a state below the melting point is a value obtained by measuring 180 ° peel strength with respect to a polyethylene terephthalate film at an atmospheric temperature of 23 ° C. according to JIS Z0237.

また、第2粘着層4は、融点以上かつ前記発泡剤温度未満の温度を経た後の融点未満の状態におけるポリエチレンテレフタレートに対する剥離強度が0.1〜3.0N/25mmであるのがよい。これにより、ウエハ等の被加工物に対する固定力を得ることができる。第2粘着層4の剥離強度は、23℃の雰囲気温度におけるポリエチレンテレフタレートフィルムに対する180°剥離強度をJIS Z0237に準じて測定して得られる値である。 Further, the second adhesive layer 4 preferably has a peel strength of 0.1 to 3.0 N / 25 mm with respect to polyethylene terephthalate in a state of being above the melting point and below the melting point after passing through the temperature below the foaming agent temperature. This makes it possible to obtain a fixing force for a workpiece such as a wafer. The peel strength of the second adhesive layer 4 is a value obtained by measuring 180 ° peel strength with respect to the polyethylene terephthalate film at an atmospheric temperature of 23 ° C. according to JIS Z0237.

本実施形態では、第2粘着層4の180°剥離強度が、第1粘着層3の180°剥離強度よりも小さいのが好ましい。これは、被加工物に対する固定力が台座に対する固定力よりも小さいことを意味している。これにより、被加工物の剥離時における被加工物への粘着層の残渣が付着するのを低減することができる。具体的には、第2粘着層4の180°剥離強度は、第1粘着層3の180°剥離強度よりも0.1〜3.0N/25mm程度低いのが好ましい。
第1粘着層3および第2粘着層4の各180°剥離強度の調整は、それぞれの側鎖結晶性ポリマーの組成を変えることにより行うことができる。
In the present embodiment, it is preferable that the 180 ° peel strength of the second adhesive layer 4 is smaller than the 180 ° peel strength of the first adhesive layer 3. This means that the fixing force to the workpiece is smaller than the fixing force to the pedestal. This makes it possible to reduce the adhesion of the residue of the adhesive layer to the work piece when the work piece is peeled off. Specifically, the 180 ° peel strength of the second adhesive layer 4 is preferably 0.1 to 3.0 N / 25 mm lower than the 180 ° peel strength of the first adhesive layer 3.
The 180 ° peel strength of each of the first adhesive layer 3 and the second adhesive layer 4 can be adjusted by changing the composition of each side chain crystalline polymer.

(セパレータ)
本実施形態におけるセパレータ5a、5bは、第1粘着層3および第2粘着層4の各表面を保護するものである。
(Separator)
The separators 5a and 5b in the present embodiment protect the surfaces of the first adhesive layer 3 and the second adhesive layer 4.

セパレータ5a、5bとしては、例えばポリエチレン、ポリエチレンテレフタレート等からなるフィルムの表面に、シリコーン、フッ素等の離型剤を塗布したものが挙げられる。また、セパレータ5a、5bのそれぞれの厚さとしては、10〜110μmであるのが好ましい。 Examples of the separators 5a and 5b include those obtained by applying a mold release agent such as silicone or fluorine to the surface of a film made of polyethylene, polyethylene terephthalate or the like. The thickness of each of the separators 5a and 5b is preferably 10 to 110 μm.

セパレータ5a、5bは、互いの組成、厚さ等が同じであってもよいし、異なっていてもよい。本実施形態では、セパレータ5aはポリエチレンフィルムの表面にシリコーン系離型剤を塗布して形成したものであり、セパレータ5bはポリエチレンテレフタレートフィルムの表面にシリコーン系離型剤を塗布して形成したものである。 The separators 5a and 5b may have the same composition, thickness, or the like, or may be different from each other. In the present embodiment, the separator 5a is formed by applying a silicone-based mold release agent to the surface of a polyethylene film, and the separator 5b is formed by applying a silicone-based mold release agent to the surface of a polyethylene terephthalate film. be.

なお、本実施形態では、第1粘着層3の第1側鎖結晶性ポリマーに発泡剤を含有させたが、第2粘着層4の第2側鎖結晶性ポリマーにも発泡剤を含有させてもよい。その場合は、第2粘着層4の発泡剤は、第1粘着層3の発泡剤に比べて、発泡温度を高いものを使用するか、同じ発泡剤であれば、含有量を少なくするのが好ましい。 In the present embodiment, the first side chain crystalline polymer of the first adhesive layer 3 contains a foaming agent, but the second side chain crystalline polymer of the second adhesive layer 4 also contains a foaming agent. May be good. In that case, the foaming agent of the second adhesive layer 4 should have a higher foaming temperature than the foaming agent of the first adhesive layer 3, or if the same foaming agent, the content should be reduced. preferable.

<パターン付きウエハの製造方法>
次に、被加工物がパターン付きウエハである場合の当該ウエハの製造方法を図2に基づいて説明する。パターン付きウエハとは、例えばエピタキシャル・ウエハ、3次元スタック構造の半導体デバイス、MEMSウエハなどが挙げられ、いずれも表面に凹凸状パターンを有する。ウエハの素材としては、シリコン、サファイアガラス、炭化珪素(SiC)、窒化ガリウム(GaN)等が挙げられる。特にサファイアガラス、炭化珪素および窒化ガリウムは、難研磨材料である。
<Manufacturing method of patterned wafer>
Next, when the workpiece is a patterned wafer, a method for manufacturing the wafer will be described with reference to FIG. Examples of the patterned wafer include an epitaxial wafer, a semiconductor device having a three-dimensional stack structure, a MEMS wafer, and the like, all of which have an uneven pattern on the surface. Examples of the wafer material include silicon, sapphire glass, silicon carbide (SiC), and gallium nitride (GaN). In particular, sapphire glass, silicon carbide and gallium nitride are difficult-to-polish materials.

本実施形態におけるウエハの製造方法は、前記した粘着シート1を用いてウエハを研削および/または研磨する方法であり、以下の(i)〜(iv)の工程を備える。
(i)図2(a)に示すように、粘着テープ1から図1に示したセパレータ5aを剥がして、台座100上に載置し、前記第1側鎖結晶性ポリマーの融点以上で発泡開始温度未満の温度で、上面からローラ6(加圧手段)にて加圧しながら、粘着テープ1を台座100上に貼り付ける。台座100としては、例えばセラミック製のものが挙げられる。
(ii)図2(b)に示すように、第2粘着層4の表面に、第2側鎖結晶性ポリマーの融点以上の温度でパターン付きウエハ200の凹凸状パターン面を貼り付ける。
なお、(i)工程と、(ii)工程とは、順序が逆であってもよい。
(iii)図2(c)に示すように、パターン付きウエハ200の表面(すなわち、台座100に貼り合せた面とは反対側の面)を研削および/または研磨する。図2(c)では、研削片を符合201で示している。
(iv)図2(d)に示すように、粘着シート1の温度を第1粘着層3に含有される発泡剤の発泡開始温度以上にし、台座100から粘着シート1およびパターン付きウエハ200を剥離する。図2(d)では、剥離後の第1粘着層を符号3´で示している。
(v)図2(e)に示すように、パターン付きウエハ200をヒータ300上に載置し、加熱して
粘着シート1の温度を第2粘着層4の第2側鎖結晶性ポリマーの融点以上にし、ウエハ200から粘着シート1を剥離する。
The wafer manufacturing method in the present embodiment is a method of grinding and / or polishing the wafer using the adhesive sheet 1 described above, and includes the following steps (i) to (iv).
(I) As shown in FIG. 2A, the separator 5a shown in FIG. 1 is peeled off from the adhesive tape 1 and placed on the pedestal 100, and foaming starts at the melting point or higher of the first side chain crystalline polymer. The adhesive tape 1 is attached onto the pedestal 100 while being pressurized by the roller 6 (pressurizing means) from the upper surface at a temperature lower than the temperature. Examples of the pedestal 100 include those made of ceramic.
(Ii) As shown in FIG. 2B, the uneven pattern surface of the patterned wafer 200 is attached to the surface of the second adhesive layer 4 at a temperature equal to or higher than the melting point of the second side chain crystalline polymer.
The order of the step (i) and the step (ii) may be reversed.
(Iii) As shown in FIG. 2 (c), the surface of the patterned wafer 200 (that is, the surface opposite to the surface bonded to the pedestal 100) is ground and / or polished. In FIG. 2 (c), the grinding piece is indicated by the sign 201.
(Iv) As shown in FIG. 2D, the temperature of the pressure-sensitive adhesive sheet 1 is set to be equal to or higher than the foaming start temperature of the foaming agent contained in the first pressure-sensitive adhesive layer 3, and the pressure-sensitive adhesive sheet 1 and the patterned wafer 200 are peeled off from the pedestal 100. do. In FIG. 2D, the first adhesive layer after peeling is indicated by reference numeral 3'.
(V) As shown in FIG. 2 (e), the patterned wafer 200 is placed on the heater 300 and heated to raise the temperature of the pressure-sensitive adhesive sheet 1 to the melting point of the second side chain crystalline polymer of the second pressure-sensitive adhesive layer 4. With the above, the adhesive sheet 1 is peeled off from the wafer 200.

本実施形態に係るウエハの製造方法は、前記した粘着シート1を用いるので、前記(i)の工程では、パターン付きウエハ200を台座100に安定して強固に固定することができる。したがって、前記(ii)の工程では、パターン付きウエハ200を、ずれや割れなくマイクロメートルスケールの精密研磨を精度よく行うことができる。研削の場合も、所望の形状に研削することができる。 Since the adhesive sheet 1 described above is used in the wafer manufacturing method according to the present embodiment, the patterned wafer 200 can be stably and firmly fixed to the pedestal 100 in the step (i). Therefore, in the step (ii), the patterned wafer 200 can be accurately polished on a micrometer scale without slippage or cracking. Also in the case of grinding, it is possible to grind to a desired shape.

そして、前記(iv),(IV)の工程では、固定力を十分に低下させることができるので、パターン付きウエハ200の取り外しを容易に行うことができ、ウエハ200の表面に粘着シート1の残渣が付着するのを低減することができる。 In the steps (iv) and (IV) above, the fixing force can be sufficiently reduced, so that the patterned wafer 200 can be easily removed, and the residue of the adhesive sheet 1 can be easily removed from the surface of the wafer 200. Can be reduced from adhering.

以下、合成例および実施例を挙げて本発明を詳細に説明するが、本発明は以下の合成例および実施例のみに限定されるものではない。なお、以下の説明で「部」は質量部を意味する。 Hereinafter, the present invention will be described in detail with reference to synthetic examples and examples, but the present invention is not limited to the following synthetic examples and examples. In the following description, "part" means a mass part.

(合成例1:第1側鎖結晶性ポリマー)
ベヘニルアクリレートを45部、ブチルアクリレートを50部、ヒドロキシエチルアクリレートを5部、および重合開始剤としてパーブチルND(日油社製)を0.5部の割合で、それぞれ酢酸エチル:n−ヘプタン=7:3(質量比)の混合溶媒230部に加え、60℃で5時間攪拌して、これらのモノマーを重合させた。得られた共重合体の重量平均分子量は550,000、融点は44℃であった。
(Synthesis Example 1: First Side Chain Crystalline Polymer)
45 parts of behenyl acrylate, 50 parts of butyl acrylate, 5 parts of hydroxyethyl acrylate, and 0.5 part of perbutyl ND (manufactured by Nichiyu Co., Ltd.) as a polymerization initiator, ethyl acetate: n-heptane = 7 respectively. These monomers were polymerized by adding to 230 parts of a mixed solvent of 3: 3 (mass ratio) and stirring at 60 ° C. for 5 hours. The obtained copolymer had a weight average molecular weight of 550,000 and a melting point of 44 ° C.

(合成例2:第2側鎖結晶性ポリマー)
ベヘニルアクリレートを45部、ブチルアクリレートを50部、アクリル酸を5部、および重合開始剤としてパーブチルND(日油社製)を0.5部の割合で、それぞれ酢酸エチル:n−ヘプタン=7:3(質量比)の混合溶媒230部に加え、60℃で5時間攪拌して、これらのモノマーを重合させた。得られた共重合体の重量平均分子量は580,000、融点は45℃であった。
(Synthesis Example 2: Second Side Chain Crystalline Polymer)
45 parts of behenyl acrylate, 50 parts of butyl acrylate, 5 parts of acrylic acid, and 0.5 part of perbutyl ND (manufactured by Nichiyu Co., Ltd.) as a polymerization initiator, ethyl acetate: n-heptane = 7: These monomers were polymerized by adding to 230 parts of the mixed solvent of 3 (mass ratio) and stirring at 60 ° C. for 5 hours. The obtained copolymer had a weight average molecular weight of 580,000 and a melting point of 45 ° C.

(合成例3:第2側鎖結晶性ポリマー)
ベヘニルアクリレートを45部、メチルアクリレートを15部、ブチルアクリレートを35部、アクリル酸を5部、および重合開始剤としてパーブチルND(日油社製)を0.5部の割合で、それぞれ酢酸エチル:n−ヘプタン=7:3(質量比)の混合溶媒230部に加え、60℃で5時間攪拌して、これらのモノマーを重合させた。得られた共重合体の重量平均分子量は600,000、融点は45℃であった。
(Synthesis Example 3: Second Side Chain Crystalline Polymer)
45 parts of behenyl acrylate, 15 parts of methyl acrylate, 35 parts of butyl acrylate, 5 parts of acrylic acid, and 0.5 part of perbutyl ND (manufactured by Nichiyu Co., Ltd.) as a polymerization initiator. These monomers were polymerized by adding 230 parts of a mixed solvent of n-heptane = 7: 3 (mass ratio) and stirring at 60 ° C. for 5 hours. The obtained copolymer had a weight average molecular weight of 600,000 and a melting point of 45 ° C.

(比較合成例3:感圧接着剤)
2-エチルヘキシルアクリレートを52部、メチルアクリレートを40部、2-ヒドロキシエチルアクリレートを8部、および重合開始剤としてパーブチルND(日油社製)を0.3部の割合で、それぞれ酢酸エチル:トルエン=7:3(質量比)の混合溶媒200部に加え、60℃で5時間攪拌して、これらのモノマーを重合させた。得られた共重合体の重量平均分子量は450,000であった。
(Comparative Synthesis Example 3: Pressure Sensitive Adhesive)
Ethyl acetate: toluene in a ratio of 52 parts of 2-ethylhexyl acrylate, 40 parts of methyl acrylate, 8 parts of 2-hydroxyethyl acrylate, and 0.3 part of perbutyl ND (manufactured by Nichiyu Co., Ltd.) as a polymerization initiator. These monomers were polymerized by adding 200 parts of a mixed solvent of 7: 3 (mass ratio) and stirring at 60 ° C. for 5 hours. The weight average molecular weight of the obtained copolymer was 450,000.

合成例1〜2、比較合成例3の各共重合体を表1に示す。なお、融点は、共重合体をDSCで10℃/分の測定条件で測定することによって得られた。重量平均分子量は、共重合体をGPCで測定し、得られた測定値をポリスチレン換算することによって得た。 Table 1 shows the copolymers of Synthesis Examples 1 and 2 and Comparative Synthesis Example 3. The melting point was obtained by measuring the copolymer with DSC under the measuring conditions of 10 ° C./min. The weight average molecular weight was obtained by measuring the copolymer with GPC and converting the obtained measured value into polystyrene.

Figure 0006967908
Figure 0006967908

[実施例1]
(感温性粘着シートの作製)
使用した発泡剤および架橋剤は、以下のとおりである。
・発泡剤:平均粒径が6〜9μmであり、発泡開始温度が90℃以上であるEXPANCEL社製のマイクロバルーン発泡剤「461DU20」
・架橋剤:日本ポリウレタン工業社製のイソシアネート化合物「コロネートL−45E」
(第1粘着層の調製)
合成例1で得た側鎖結晶性ポリマー/発泡剤/架橋剤を100/50/1の割合(質量比)で酢酸エチルに混合して固形分が30%になるように調整し、塗布液を得、この塗布液をポリエチレンテレフタレートからなる厚さ100μmのフィルム状の基材に塗布して乾燥させ、厚さ20μmの第1粘着層を形成した。
(第2粘着層の調製)
合成例2で得た側鎖結晶性ポリマー/架橋剤を100/3の割合(質量比)で酢酸エチルに混合して固形分が30%になるように調整し、塗布液を得た。次に、片面に第1粘着層を形成した上記基材の反対面に塗布液を塗布して乾燥させ、厚さ40μmの第2粘着層を形成し、粘着シートを得た。
[Example 1]
(Making a temperature-sensitive adhesive sheet)
The foaming agents and cross-linking agents used are as follows.
Foaming agent: Microballoon foaming agent "461DU20" manufactured by EXPANCEL, which has an average particle size of 6 to 9 μm and a foaming start temperature of 90 ° C. or higher.
-Crosslinking agent: Isocyanate compound "Coronate L-45E" manufactured by Nippon Polyurethane Industry Co., Ltd.
(Preparation of the first adhesive layer)
The side chain crystalline polymer / foaming agent / cross-linking agent obtained in Synthesis Example 1 is mixed with ethyl acetate at a ratio of 100/50/1 (mass ratio) to adjust the solid content to 30%, and the coating liquid is adjusted. The coating liquid was applied to a film-like substrate having a thickness of 100 μm made of polyethylene terephthalate and dried to form a first adhesive layer having a thickness of 20 μm.
(Preparation of the second adhesive layer)
The side chain crystalline polymer / cross-linking agent obtained in Synthesis Example 2 was mixed with ethyl acetate at a ratio of 100/3 (mass ratio) to adjust the solid content to 30%, and a coating liquid was obtained. Next, a coating liquid was applied to the opposite surface of the base material having the first adhesive layer formed on one side and dried to form a second adhesive layer having a thickness of 40 μm to obtain an adhesive sheet.

[実施例2]
(感温性粘着シートの作製)
使用した発泡剤および架橋剤は、以下のとおりである。
・発泡剤:平均粒径が6〜9μmであり、発泡開始温度が90℃以上であるEXPANCEL社製のマイクロバルーン発泡剤「461DU20」
・架橋剤:日本ポリウレタン工業社製のイソシアネート化合物「コロネートL−45E」
(第1粘着層の調製)
合成例1で得た側鎖結晶性ポリマー/発泡剤/架橋剤を100/50/1の割合(質量比)で酢酸エチルに混合して固形分が30%になるように調整し、塗布液を得、この塗布液をポリエチレンテレフタレートからなる厚さ100μmのフィルム状の基材に塗布して乾燥させ、厚さ20μmの第1粘着層を形成した。
(第2粘着層の調製)
合成例3で得た側鎖結晶性ポリマー/架橋剤を100/3の割合(質量比)で酢酸エチルに混合して固形分が30%になるように調整し、塗布液を得た。次に、片面に第1粘着層を形成した上記基材の反対面に塗布液を塗布して乾燥させ、厚さ40μmの第2粘着層を形成し、粘着シートを得た。
[Example 2]
(Making a temperature-sensitive adhesive sheet)
The foaming agents and cross-linking agents used are as follows.
Foaming agent: Microballoon foaming agent "461DU20" manufactured by EXPANCEL, which has an average particle size of 6 to 9 μm and a foaming start temperature of 90 ° C. or higher.
-Crosslinking agent: Isocyanate compound "Coronate L-45E" manufactured by Nippon Polyurethane Industry Co., Ltd.
(Preparation of the first adhesive layer)
The side chain crystalline polymer / foaming agent / cross-linking agent obtained in Synthesis Example 1 is mixed with ethyl acetate at a ratio of 100/50/1 (mass ratio) to adjust the solid content to 30%, and the coating liquid is adjusted. The coating liquid was applied to a film-like substrate having a thickness of 100 μm made of polyethylene terephthalate and dried to form a first adhesive layer having a thickness of 20 μm.
(Preparation of the second adhesive layer)
The side chain crystalline polymer / cross-linking agent obtained in Synthesis Example 3 was mixed with ethyl acetate at a ratio of 100/3 (mass ratio) to adjust the solid content to 30%, and a coating liquid was obtained. Next, a coating liquid was applied to the opposite surface of the base material having the first adhesive layer formed on one side and dried to form a second adhesive layer having a thickness of 40 μm to obtain an adhesive sheet.

[比較例1]
(感圧粘着シートの作製)
(第1粘着層の調整)
比較合成例3で得た感圧接着剤/発泡剤/架橋剤を100/30/0.5の割合(質量比)で酢酸エチルに混合して固形分が30%になるように調整し、塗布液を得、この塗布液をポリエチレンテレフタレートからなる厚さ100μmの離形フィルム上に塗布して乾燥させ、厚さ40μmの粘着層を形成した。
(第2粘着層の調整)
比較合成例3で得た感圧接着剤/架橋剤を100/1の割合(質量比)で酢酸エチルに混合して固形分が30%になるように調整し、塗布液を得た。次に、片面に第1粘着層を形成した上記基材の反対面に塗布液を塗布して乾燥させ、厚さ40μmの第2粘着層を形成し、粘着シートを得た。
[Comparative Example 1]
(Making a pressure-sensitive adhesive sheet)
(Adjustment of the first adhesive layer)
The pressure-sensitive adhesive / foaming agent / cross-linking agent obtained in Comparative Synthesis Example 3 was mixed with ethyl acetate at a ratio (mass ratio) of 100/30/0.5 to adjust the solid content to 30%. A coating liquid was obtained, and this coating liquid was applied onto a release film having a thickness of 100 μm made of polyethylene terephthalate and dried to form an adhesive layer having a thickness of 40 μm.
(Adjustment of the second adhesive layer)
The pressure-sensitive adhesive / cross-linking agent obtained in Comparative Synthesis Example 3 was mixed with ethyl acetate at a ratio of 100/1 (mass ratio) to adjust the solid content to 30%, and a coating liquid was obtained. Next, a coating liquid was applied to the opposite surface of the base material having the first adhesive layer formed on one side and dried to form a second adhesive layer having a thickness of 40 μm to obtain an adhesive sheet.

[実施例3]
(ウエハの製造)
以下の手順でパターン付きウエハの製造を行った。
(i)実施例1で得た粘着シート1から図1に示したセパレータ5aを剥がして、セラミック製の台座100(支持基板)上に載置し、60℃の温度で、上面からローラ6(加圧手段)にて加圧しながら、粘着テープ1を台座100上に貼り付けた(図2(a))。
(ii)第2粘着層4の表面に、60℃の温度でパターン付きウエハ200の凹凸状パターン面を貼り付けた(図2(b))。
(iii)図2(c)に示すように、パターン付きウエハ200の台座100に貼り合せた面とは反対側の面に対して研削および研磨を行って、所定の厚みにした(図2(c))。
(iv)粘着シート1の温度を120℃にし、台座100から粘着シート1およびパターン付きウエハ200を剥離した(図2(d))。
(v)パターン付きウエハ200をヒータ300上に載置し、60℃に加熱して、ウエハ200から粘着シート1を剥離した(図2(e))。
その結果、実施例1で得た粘着シート1を用いることにより、上記(iii)工程において、ウエハ200は研削および研磨によるズレや割れの発生は認めらなかった。このことから、粘着シート1は高い加工保持性を有していることがわかる。
また、上記(v)工程において、剥離したウエハ200のパターン面には、第2粘着層4の残渣は付着していなかった。
[Example 3]
(Wafer manufacturing)
A patterned wafer was manufactured by the following procedure.
(I) The separator 5a shown in FIG. 1 was peeled off from the adhesive sheet 1 obtained in Example 1, placed on a ceramic pedestal 100 (support substrate), and at a temperature of 60 ° C., a roller 6 (roller 6 () from the upper surface. The adhesive tape 1 was attached onto the pedestal 100 while being pressurized by the pressurizing means) (FIG. 2A).
(Ii) An uneven pattern surface of the patterned wafer 200 was attached to the surface of the second adhesive layer 4 at a temperature of 60 ° C. (FIG. 2 (b)).
(Iii) As shown in FIG. 2 (c), the surface of the patterned wafer 200 opposite to the surface bonded to the pedestal 100 was ground and polished to a predetermined thickness (FIG. 2 (FIG. 2). c)).
(Iv) The temperature of the adhesive sheet 1 was set to 120 ° C., and the adhesive sheet 1 and the patterned wafer 200 were peeled off from the pedestal 100 (FIG. 2 (d)).
(V) The patterned wafer 200 was placed on the heater 300 and heated to 60 ° C. to peel off the adhesive sheet 1 from the wafer 200 (FIG. 2 (e)).
As a result, by using the pressure-sensitive adhesive sheet 1 obtained in Example 1, in the step (iii) above, the wafer 200 was not found to be displaced or cracked due to grinding and polishing. From this, it can be seen that the adhesive sheet 1 has high processing retention.
Further, in the step (v) above, the residue of the second adhesive layer 4 did not adhere to the pattern surface of the peeled wafer 200.

[実施例4]
(ウエハの製造)
粘着シート1として、実施例2で得た粘着シートを使用した他は、実施例3と同様の手順でパターン付きウエハを製造した。
その結果、実施例2で得た粘着シート1を用いることにより、実施例3と同じ(iii)工程において、ウエハ200は研削および研磨によるズレや割れの発生は認めらなかった。このことから、粘着シート1は高い加工保持性を有していることがわかる。
また、実施例3と同じ(v)工程において、剥離したウエハ200のパターン面には、第2粘着層4の残渣は付着していなかった。
[Example 4]
(Wafer manufacturing)
A patterned wafer was manufactured by the same procedure as in Example 3 except that the adhesive sheet obtained in Example 2 was used as the adhesive sheet 1.
As a result, by using the pressure-sensitive adhesive sheet 1 obtained in Example 2, the wafer 200 was not found to be displaced or cracked due to grinding and polishing in the same step (iii) as in Example 3. From this, it can be seen that the adhesive sheet 1 has high processing retention.
Further, in the same step (v) as in Example 3, the residue of the second adhesive layer 4 did not adhere to the pattern surface of the peeled wafer 200.

[比較例2]
実施例1で得た粘着シートに代えて、比較例1で得た感温性粘着シートを使用した以外は、実施例3と同様にしてウエハを作製したところ、ウエハ200は研削および研磨により、ウエハがズレて、割れが発生した。このことから、比較例1で得た感圧粘着シートは加工保持性を有していないことがわかる。また、上記(v)工程において、剥離したウエハ200のパターン面には、残渣が付着していた。
[Comparative Example 2]
When a wafer was produced in the same manner as in Example 3 except that the temperature-sensitive adhesive sheet obtained in Comparative Example 1 was used instead of the adhesive sheet obtained in Example 1, the wafer 200 was ground and polished. The wafer was misaligned and cracked. From this, it can be seen that the pressure-sensitive adhesive sheet obtained in Comparative Example 1 does not have processing retention. Further, in the step (v), the residue adhered to the pattern surface of the peeled wafer 200.

<評価>
実施例1および比較例1でそれぞれ得られた粘着シートの第1および第2粘着層について、貯蔵弾性率G’、180°剥離強度を評価した。また、粘着シートの研削・研磨保持性および糊残り性についても評価した。評価方法は以下の通りである。
(貯蔵弾性率G’)
セイコーインスツルメンツ社(Seiko Instruments Inc.)製の動的粘弾性測定装置「DMS 6100」を用いて、10Hz、5℃/分、0〜100℃の昇温過程において、23℃における第1および第2粘着層の貯蔵弾性率G’を測定した。
<Evaluation>
The storage elastic modulus G'and 180 ° peel strength were evaluated for the first and second adhesive layers of the adhesive sheets obtained in Example 1 and Comparative Example 1, respectively. In addition, the grinding / polishing retention and adhesive residue of the adhesive sheet were also evaluated. The evaluation method is as follows.
(Storage modulus G')
Using the dynamic viscoelasticity measuring device "DMS 6100" manufactured by Seiko Instruments Inc., in the process of raising the temperature at 10 Hz, 5 ° C / min, and 0 to 100 ° C, the first and second at 23 ° C. The storage elastic modulus G'of the adhesive layer was measured.

(180°剥離強度)
第1粘着層を上側にし、第2粘着層を市販両面テープを介してステンレス鋼板に固定した。次に、第1粘着層を厚さ25μmのポリエチレンテレフタレートフィルムと重ね合わせ、60℃(融点以上かつ発泡剤温度未満)の温度を経た後、23℃(融点未満)の温度において両者を貼着した。そして、ロードセルを用いて300mm/分の速度でポリエチレンテレフタレートフィルムを第1粘着層から180°剥離した。このときの180°剥離強度をJIS Z0237に準拠して測定し、第1粘着層の23℃の雰囲気温度におけるポリエチレンテレフタレートフィルムに対する180°剥離強度を評価した。
一方、上記と同様にして、第2粘着層をポリエチレンテレフタレートフィルムと重ね合わせ、60℃(融点以上かつ発泡剤温度未満)の温度を経た後、23℃(融点未満)の温度において両者を貼着した。そして、上記と同様にしてポリエチレンテレフタレートフィルムに対する180°剥離強度を評価した。
(180 ° peel strength)
The first adhesive layer was on the upper side, and the second adhesive layer was fixed to the stainless steel plate via a commercially available double-sided tape. Next, the first adhesive layer was laminated with a polyethylene terephthalate film having a thickness of 25 μm, passed through a temperature of 60 ° C. (above the melting point and below the foaming agent temperature), and then bonded at a temperature of 23 ° C. (below the melting point). .. Then, the polyethylene terephthalate film was peeled from the first adhesive layer by 180 ° at a speed of 300 mm / min using a load cell. The 180 ° peel strength at this time was measured in accordance with JIS Z0237, and the 180 ° peel strength of the first adhesive layer with respect to the polyethylene terephthalate film at an atmospheric temperature of 23 ° C was evaluated.
On the other hand, in the same manner as above, the second adhesive layer is laminated with the polyethylene terephthalate film, and after passing through a temperature of 60 ° C. (above the melting point and below the foaming agent temperature), both are attached at a temperature of 23 ° C. (below the melting point). bottom. Then, the 180 ° peel strength with respect to the polyethylene terephthalate film was evaluated in the same manner as described above.

(研削・研磨保持性)
まず、粘着シートの第1粘着層を60℃(融点以上かつ発泡剤温度未満)で台座に貼付け、かつ第2粘着層も前記同様の60℃で、直径100mm×厚さ700μmのサファイアガラスからなる板状の被加工物に2kg/cm2の圧力を掛けて5分間圧着した。ついで、圧力を解除した後、60℃から23℃に降温して20分間放置した。そして、被加工物に対して研削および研磨の順に加工を行った。研削・研磨条件は以下のように設定した。
<研削条件>
研削機:枚葉式研削盤
・粗研削
・・除去量:400μm
・・回転数:1000rpm
・・切り込み:1μm/s以下
・仕上げ研削
・・除去量:200μm
・・回転数:1000rpm
・・切り込み:0.5μm/s以下
<研磨条件>
・・定盤:銅
・・ダイヤ砥粒:5μm
・・回転数:30rpm
・・圧力:300g/cm2
(Grinding / polishing retention)
First, the first adhesive layer of the adhesive sheet is attached to the pedestal at 60 ° C. (above the melting point and below the foaming agent temperature), and the second adhesive layer is also made of sapphire glass having a diameter of 100 mm and a thickness of 700 μm at the same 60 ° C. as described above. A pressure of 2 kg / cm 2 was applied to the plate-shaped workpiece and crimped for 5 minutes. Then, after releasing the pressure, the temperature was lowered from 60 ° C. to 23 ° C. and left for 20 minutes. Then, the workpiece was processed in the order of grinding and polishing. Grinding / polishing conditions were set as follows.
<Grinding conditions>
Grinding machine: Single-wafer grinding machine, rough grinding, removal amount: 400 μm
・ ・ Rotation speed: 1000 rpm
・ ・ Cut: 1 μm / s or less ・ Finish grinding ・ ・ Removal amount: 200 μm
・ ・ Rotation speed: 1000 rpm
・ ・ Cut: 0.5 μm / s or less <polishing conditions>
・ ・ Surface plate: Copper ・ ・ Diamond abrasive grains: 5 μm
・ ・ Rotation speed: 30 rpm
・ ・ Pressure: 300g / cm 2

上述の条件で、被加工物を厚さ70μmまで薄膜化した。このとき、被加工物であるサファイアガラスに割れが生じたか否かを目視観察することによって研削・研磨保持性を評価した。なお、目視観察は、研磨後に行った。また、評価基準は、以下のように設定した。
〇:研磨後のサファイアガラスに割れが生じなかった。
×:研磨後のサファイアガラスに割れが生じた。
Under the above conditions, the workpiece was thinned to a thickness of 70 μm. At this time, the grinding / polishing retention was evaluated by visually observing whether or not the sapphire glass, which is the workpiece, was cracked. The visual observation was performed after polishing. The evaluation criteria were set as follows.
〇: No cracks occurred in the polished sapphire glass.
X: The sapphire glass after polishing was cracked.

(糊残り性)
粘着シートの第2粘着層を60℃で直径100mm×厚さ800μmのシリコーンウエハ鏡面側に2kg/cm2の圧力を掛けて5分間圧着した。ついで、圧力を解除した後、60℃から23℃に降温して20分間放置した。ついで、再度、60℃に昇温し、5分間放置した後、ロードセルを用いて300mm/分の速度で第2粘着層をシリコーンウエハから180°剥離した。剥離後のシリコーンウエハ鏡面側を電子顕微鏡(倍率:20倍)にて観察し、糊残りの有無を確認した。また、評価基準は、以下のように設定した。
〇:糊残りが観察されなかった。
×:糊残りが観察された。
(Remaining glue)
The second adhesive layer of the adhesive sheet was pressure-bonded at 60 ° C. on the mirror surface side of a silicon wafer having a diameter of 100 mm and a thickness of 800 μm under a pressure of 2 kg / cm 2 for 5 minutes. Then, after releasing the pressure, the temperature was lowered from 60 ° C. to 23 ° C. and left for 20 minutes. Then, the temperature was raised to 60 ° C. again and left for 5 minutes, and then the second adhesive layer was peeled from the silicone wafer by 180 ° at a speed of 300 mm / min using a load cell. The mirror surface side of the silicon wafer after peeling was observed with an electron microscope (magnification: 20 times) to confirm the presence or absence of adhesive residue. The evaluation criteria were set as follows.
〇: No adhesive residue was observed.
X: Glue residue was observed.

以上の評価結果を表2に示す。

Figure 0006967908
The above evaluation results are shown in Table 2.

Figure 0006967908

1 粘着シート
2 基材
3 第1粘着層
4 第2粘着層
5a、5b セパレータ
100 台座
1 Adhesive sheet 2 Base material 3 1st adhesive layer 4 2nd adhesive layer 5a, 5b Separator 100 pedestal

Claims (7)

フィルム状の基材と、前記基材の片面に積層されており台座に貼り付ける第1粘着層と、前記基材の他面に積層されており被加工物に貼り付ける第2粘着層とを備え、
前記第1粘着層は、第1側鎖結晶性ポリマーおよび発泡剤を含有するとともに、前記第1側鎖結晶性ポリマーの融点以上の温度で流動性を示し、第1側鎖結晶性ポリマーの融点は発泡剤の発泡温度未満であると共に、
前記第2粘着層は、第2側鎖結晶性ポリマーを含有するとともに、前記第2側鎖結晶性ポリマーの融点以上の温度で流動性を示し、
前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーの融点未満において、前記第1粘着層および第2粘着層の貯蔵弾性率がいずれも1×10 6 〜1×10 8 Paであり、
前記第2粘着層の貯蔵弾性率が、前記第1粘着層の貯蔵弾性率よりも大きい感温性粘着シート。
A film-like base material, a first adhesive layer laminated on one side of the base material and attached to a pedestal, and a second adhesive layer laminated on the other surface of the base material and attached to a work piece. Prepare,
The first adhesive layer contains a first side chain crystalline polymer and a foaming agent, and exhibits fluidity at a temperature equal to or higher than the melting point of the first side chain crystalline polymer, and is the melting point of the first side chain crystalline polymer. Is below the foaming temperature of the foaming agent and
The second adhesive layer, as well as contains a second side chain crystalline polymer, shows fluidity at the second side chain a temperature above the melting point of the crystalline polymer,
Below the melting points of the first side chain crystalline polymer and the second side chain crystalline polymer, the storage elastic moduli of the first adhesive layer and the second adhesive layer are both 1 × 10 6 to 1 × 10 8 Pa. can be,
A temperature-sensitive adhesive sheet in which the storage elastic modulus of the second adhesive layer is larger than the storage elastic modulus of the first adhesive layer.
前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーの融点がいずれも発泡開始温度未満で、30℃〜70℃である請求項1に記載の感温性粘着シート。 The temperature-sensitive pressure-sensitive adhesive sheet according to claim 1, wherein the melting points of the first side chain crystalline polymer and the second side chain crystalline polymer are both lower than the foaming start temperature and are 30 ° C. to 70 ° C. 前記第1側鎖結晶性ポリマーおよび前記第2側鎖結晶性ポリマーは、炭素数16以上の直鎖状アルキル基を有するアクリル酸エステルまたはメタクリル酸エステル30〜70質量部と、炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを30〜70質量部と、極性モノマー1〜10質量部を重合させて得られる重合体である請求項1または2に記載の感温性粘着シート。 The first side chain crystalline polymer and the second side chain crystalline polymer have 30 to 70 parts by mass of an acrylic acid ester or a methacrylic acid ester having a linear alkyl group having 16 or more carbon atoms, and 1 to 6 carbon atoms. The temperature-sensitive pressure-sensitive adhesive sheet according to claim 1 or 2 , which is a polymer obtained by polymerizing 30 to 70 parts by mass of an acrylic acid ester or a methacrylate ester having an alkyl group of the above and 1 to 10 parts by mass of a polar monomer. .. 前記第2側鎖結晶性ポリマーは、炭素数16以上の直鎖状アルキル基を有するアクリル酸エステルまたはメタクリル酸エステル30〜70質量部と、炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを30〜70質量部と、極性モノマー1〜10質量部を重合させて得られる重合体であり、
前記炭素数1〜6のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルが、当該エステルの総量に対して炭素数1または2のアルキル基を有するアクリル酸エステルまたはメタクリル酸エステルを2〜70質量%含む請求項に記載の感温性粘着シート。
The second side chain crystalline polymer is an acrylic acid ester or methacrylic acid ester having a linear alkyl group having 16 or more carbon atoms or an acrylic acid ester having an alkyl group having 1 to 6 carbon atoms by 30 to 70 parts by mass. It is a polymer obtained by polymerizing 30 to 70 parts by mass of a methacrylic acid ester and 1 to 10 parts by mass of a polar monomer.
The acrylic acid ester or methacrylic acid ester having an alkyl group having 1 to 6 carbon atoms contains 2 to 70% by mass of the acrylic acid ester or methacrylic acid ester having an alkyl group having 1 or 2 carbon atoms with respect to the total amount of the ester. The temperature-sensitive adhesive sheet according to claim 3, which comprises.
融点以上かつ前記発泡剤温度未満の温度を経た後の融点未満の前記第1粘着層におけるポリエチレンテレフタレートに対する剥離強度が0.5〜5.0N/25mmであり、融点以上かつ前記発泡剤温度未満の温度を経た後の融点未満の前記第2粘着層におけるポリエチレンテレフタレートに対する剥離強度が0.1〜3.0N/25mmである請求項1〜のいずれかに記載の感温性粘着シート。 The peel strength with respect to polyethylene terephthalate in the first adhesive layer below the melting point after passing through a temperature equal to or higher than the melting point and lower than the temperature of the foaming agent is 0.5 to 5.0 N / 25 mm, and is equal to or higher than the melting point and lower than the temperature of the foaming agent. The temperature-sensitive pressure-sensitive adhesive sheet according to any one of claims 1 to 4 , wherein the peeling strength of the second pressure-sensitive adhesive layer below the melting point after passing the temperature with respect to polyethylene terephthalate is 0.1 to 3.0 N / 25 mm. 前記第2粘着層の剥離強度が、前記第1粘着層の剥離強度よりも小さい請求項に記載の感温性粘着シート。 The temperature-sensitive adhesive sheet according to claim 5 , wherein the peel strength of the second adhesive layer is smaller than the peel strength of the first adhesive layer. 請求項1〜のいずれかに記載の感温性粘着シートを用いて、前記感温性粘着シートの第1粘着層を前記第1側鎖結晶性ポリマーの融点以上で発泡開始温度未満の温度で台座に貼り付け、かつ第2粘着層を前記第2側鎖結晶性ポリマーの融点以上の温度でパターン付きウエハの凹凸状パターン面に貼り付ける工程と、
前記パターン付きウエハの前記台座に貼り合せた面とは反対側の面を研削および/また
は研磨する工程と、
前記感温性粘着シートの温度を前記発泡剤の発泡開始温度以上にし、前記台座から前記感温性粘着シートおよび前記パターン付きウエハを剥離する工程と、
前記粘着シートの温度を前記第2側鎖結晶性ポリマーの融点以上にし、前記ウエハから粘着シートを剥離する工程と、
を含むパターン付きウエハの製造方法。
Using the temperature-sensitive pressure-sensitive adhesive sheet according to any one of claims 1 to 6, the temperature at which the first pressure-sensitive adhesive layer of the temperature-sensitive pressure-sensitive adhesive sheet is equal to or higher than the melting point of the first side chain crystalline polymer and lower than the foaming start temperature. The step of attaching the second adhesive layer to the pedestal and attaching the second adhesive layer to the uneven pattern surface of the patterned wafer at a temperature equal to or higher than the melting point of the second side chain crystalline polymer.
A step of grinding and / or polishing a surface of the patterned wafer opposite to the surface bonded to the pedestal.
A step of setting the temperature of the temperature-sensitive adhesive sheet to be equal to or higher than the foaming start temperature of the foaming agent and peeling the temperature-sensitive adhesive sheet and the patterned wafer from the pedestal.
A step of setting the temperature of the pressure-sensitive adhesive sheet to a temperature equal to or higher than the melting point of the second side chain crystalline polymer and peeling the pressure-sensitive adhesive sheet from the wafer.
A method for manufacturing a patterned wafer including.
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