WO2013108694A1 - 積層研磨パッドの製造方法 - Google Patents
積層研磨パッドの製造方法 Download PDFInfo
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- WO2013108694A1 WO2013108694A1 PCT/JP2013/050236 JP2013050236W WO2013108694A1 WO 2013108694 A1 WO2013108694 A1 WO 2013108694A1 JP 2013050236 W JP2013050236 W JP 2013050236W WO 2013108694 A1 WO2013108694 A1 WO 2013108694A1
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- WIPO (PCT)
- Prior art keywords
- laminated
- polishing
- layer
- melt adhesive
- polishing pad
- Prior art date
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/001—Manufacture of flexible abrasive materials
- B24D11/003—Manufacture of flexible abrasive materials without embedded abrasive particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/22—Lapping pads for working plane surfaces characterised by a multi-layered structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/008—Finishing manufactured abrasive sheets, e.g. cutting, deforming
Definitions
- the present invention stabilizes flattening processing of optical materials such as lenses and reflecting mirrors, silicon wafers, glass substrates for hard disks, aluminum substrates, and materials that require high surface flatness such as general metal polishing processing
- the present invention also relates to a laminated polishing pad that can be performed with high polishing efficiency.
- the laminated polishing pad of the present invention is particularly suitable for a step of planarizing a silicon wafer and a device having an oxide layer, a metal layer, etc. formed thereon, before further laminating and forming these oxide layers and metal layers. Preferably used.
- a step of forming a conductive layer on the wafer surface and forming a wiring layer by photolithography, etching, or the like, or a step of forming an interlayer insulating film on the wiring layer cause irregularities made of a conductor such as metal or an insulator on the wafer surface.
- miniaturization of wiring and multilayer wiring have been advanced for the purpose of increasing the density of semiconductor integrated circuits, and along with this, technology for flattening the irregularities on the wafer surface has become important.
- CMP chemical mechanical polishing
- slurry a slurry-like abrasive
- abrasive grains are dispersed in a state where the surface to be polished of a wafer is pressed against the polishing surface of a polishing pad.
- a polishing apparatus generally used in CMP includes a polishing surface plate 2 that supports a polishing pad 1 and a support base (polishing head) 5 that supports a material to be polished (semiconductor wafer) 4.
- the polishing pad 1 is attached to the polishing surface plate 2 by attaching it with a double-sided tape, for example.
- the polishing surface plate 2 and the support base 5 are disposed so that the polishing pad 1 and the material to be polished 4 supported by each of the polishing surface plate 2 and the support base 5 are opposed to each other, and are provided with rotating shafts 6 and 7 respectively. Further, a pressurizing mechanism for pressing the workpiece 4 against the polishing pad 1 is provided on the support base 5 side.
- a polyurethane resin foam sheet is generally used as a polishing pad used for high-precision polishing.
- the polyurethane resin foam sheet is excellent in local flattening ability, it is difficult to apply a uniform pressure to the entire wafer surface because of insufficient cushioning properties. For this reason, usually, a soft cushion layer is separately provided on the back surface of the polyurethane resin foam sheet, and is used for polishing as a laminated polishing pad.
- a conventional laminated polishing pad usually has a polishing layer and a cushion layer bonded to each other with a double-sided tape. Slurry enters between the polishing layer and the cushion layer during polishing or occurs during polishing.
- the problem is that the durability of the double-sided tape is reduced by heat (when ceria slurry is used or metal polishing, the pad surface temperature rises to about 80 ° C.), and the polishing layer and the cushion layer are easily peeled off. There is.
- an uncured reactive hot melt adhesive is disposed between a polishing layer and a subpad layer, and the two layers are pressed to cure the uncured reactive hot melt adhesive.
- a method of manufacturing a multi-layer chemical mechanical polishing pad is disclosed that includes forming a reactive hot melt adhesive bond between the two.
- Patent Document 2 discloses a polishing pad in which a polishing layer and a lower layer are bonded by a hot melt adhesive containing EVA.
- Patent Document 3 discloses a polishing pad in which a polishing layer made of a woven fabric having an opening of 10 to 100 ⁇ m or an open lattice structure is bonded and laminated to a support through an adhesive layer formed by fusion of a thermoplastic resin. .
- JP 2010-28113 Japanese translation of PCT publication 2010-52595 JP 2011-115935 A
- An object of the present invention is to provide a method for producing a laminated polishing pad that does not warp and does not peel between the polishing layer and the cushion layer during polishing.
- the present inventors have found that the above object can be achieved by the following method for producing a laminated polishing pad, and have completed the present invention.
- the present invention provides a hot melt adhesive sheet on the surface of the cushion layer with a base material provided so that the thermoplastic resin base material can be peeled off on one side of the cushion layer, on which the thermoplastic resin base material is not provided.
- Laminating, laminating a hot melt adhesive sheet by heating or melting or softening, laminating an abrasive layer on the melted or softened hot melt adhesive to produce a laminate, and laminating the laminate to the polishing layer It is related with the manufacturing method of a laminated polishing pad including the process of cut
- thermoplastic resin substrate is not provided of the cushion layer provided with the substrate so that the thermoplastic resin substrate can be peeled off on one side of the cushion layer.
- a method for producing a laminated polishing pad comprising a step of peeling the thermoplastic resin substrate from the laminated abrasive sheet.
- the cushion layer When a laminated polishing pad is manufactured by laminating a polishing layer and a cushion layer by a continuous production method (line production method), the cushion layer has poor rigidity, so defects such as wrinkles or poor adhesion are likely to occur during bonding. .
- a cushion layer with a base material provided with rigidity by providing a thermoplastic resin base material on one side of the cushion layer is used.
- the polishing layer and the cushion layer with the base material are bonded together using a hot melt adhesive, a large warp tends to occur in the resulting laminated polishing pad.
- the present inventors considered as follows. At the time of bonding, it is necessary to heat to about 150 ° C. in order to melt or soften the hot-melt adhesive, and at that time, heat is also applied to the polishing layer and the cushion layer with the substrate. It was considered that the behavior of each layer was different depending on the difference in linear expansion coefficient between the polishing layer, the cushion layer, and the thermoplastic resin substrate when heat was applied, thereby causing warpage.
- the polishing layer and the cushion layer expand by heating and then return to their original shape when cooled, while the thermoplastic resin substrate shrinks by heating and returns to its original shape even after cooling.
- the present inventors have found that the behavior is different from that of the polishing layer and the cushion layer. And it discovered that curvature occurred in the laminated polishing pad obtained by the difference in the expansion and contraction behavior of the polishing layer and cushion layer and the thermoplastic resin substrate during heating and cooling.
- the laminate is cut into the size of the polishing layer to produce a laminated abrasive sheet, and then the thermoplastic resin substrate is peeled from the laminated abrasive sheet to produce a laminated abrasive pad without warping. can do.
- a laminated abrasive sheet by cutting the laminate into the size of the abrasive layer before the melted or softened hot melt adhesive is completely cured.
- Laminated polishing in which the polishing layer and the cushion layer are accurately laminated by cutting the laminate into the size of the polishing layer to produce a laminated polishing sheet before the molten or softened hot melt adhesive is completely cured.
- a pad can be manufactured.
- a laminated abrasive sheet by cutting the laminate into the size of the abrasive layer when the temperature of the hot melt adhesive is 40 ° C. or higher.
- the laminated body is cut into the size of the polishing layer when the temperature of the hot melt adhesive is less than 40 ° C., the laminated body is polished because it is cut in a state where the warpage of the laminated body is increased by cooling. It tends to be difficult to cut accurately according to the size of the layer.
- the production method of the present invention is particularly effective when a stretch-molded thermoplastic resin substrate is used.
- the stretch-molded thermoplastic resin base material is used, the laminated polishing pad is likely to warp, but if the manufacturing method of the present invention is employed, a laminated polishing pad free from warpage can be obtained.
- the melting temperature of the hot melt adhesive is preferably 140 to 170 ° C.
- the melting temperature of the hot melt adhesive is less than 140 ° C.
- the adhesive force of the hot melt adhesive is reduced by the heat generated during polishing and tends to be easily peeled between the polishing layer and the cushion layer.
- the melting temperature exceeds 170 ° C., when the hot melt adhesive is melted at such a temperature, the polishing layer and the cushion layer tend to be deformed or deteriorated easily.
- thermoplastic resin base material is preferably a polyethylene terephthalate base material.
- the method for producing a laminated polishing pad of the present invention may include a step of providing a pressure-sensitive double-sided tape having adhesive layers on both sides of a thermoplastic resin sheet on the surface of the cushion layer from which the thermoplastic resin base material has been peeled off. .
- the pressure-sensitive double-sided tape is used for attaching a laminated polishing pad to a polishing surface plate.
- the present invention also relates to a method for manufacturing a semiconductor device including a step of polishing a surface of a semiconductor wafer using a laminated polishing pad obtained by the above manufacturing method.
- the production method of the present invention it is possible to easily produce a laminated polishing pad that does not warp and does not peel between the polishing layer and the cushion layer during polishing. Furthermore, according to the manufacturing method of the present invention, a laminated polishing pad in which a polishing layer and a cushion layer are accurately laminated can be easily produced.
- the polishing layer in the present invention is not particularly limited as long as it is a foam having fine bubbles.
- polyurethane resin polyurethane resin, polyester resin, polyamide resin, acrylic resin, polycarbonate resin, halogen resin (polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride, etc.), polystyrene, olefin resin (polyethylene, polypropylene, etc.), epoxy resin 1 type, or 2 or more types of mixtures, such as a photosensitive resin, is mentioned.
- Polyurethane resin is a particularly preferable material for forming the polishing layer because it has excellent wear resistance and a polymer having desired physical properties can be easily obtained by variously changing the raw material composition.
- the polyurethane resin will be described on behalf of the foam.
- the polyurethane resin is composed of an isocyanate component, a polyol component (high molecular weight polyol, low molecular weight polyol, etc.), and a chain extender.
- isocyanate component a known compound in the field of polyurethane can be used without particular limitation.
- isocyanate component 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,2′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, Aromatic diisocyanates such as p-phenylene diisocyanate, m-phenylene diisocyanate, p-xylylene diisocyanate, m-xylylene diisocyanate; ethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, etc.
- Aliphatic diisocyanate 1,4-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate Isocyanate, alicyclic diisocyanates such as norbornane diisocyanate. These may be used alone or in combination of two or more.
- Examples of the high molecular weight polyol include those usually used in the technical field of polyurethane. Examples include polyether polyols typified by polytetramethylene ether glycol, polyethylene glycol, etc., polyester polyols typified by polybutylene adipate, polycaprolactone polyols, reactants of polyester glycols such as polycaprolactone and alkylene carbonate, etc. Polyester polycarbonate polyol obtained by reacting ethylene carbonate with polyhydric alcohol and then reacting the obtained reaction mixture with organic dicarboxylic acid, polycarbonate polyol obtained by transesterification of polyhydroxyl compound and aryl carbonate Etc. These may be used alone or in combination of two or more.
- low molecular weight polyamines such as ethylenediamine, tolylenediamine, diphenylmethanediamine, and diethylenetriamine
- alcohol amines such as monoethanolamine, 2- (2-aminoethylamino) ethanol, and monopropanolamine can be used in combination.
- These low molecular weight polyols and low molecular weight polyamines may be used alone or in combination of two or more.
- the blending amount of the low molecular weight polyol, the low molecular weight polyamine or the like is not particularly limited and is appropriately determined depending on the properties required for the polishing layer to be produced.
- a chain extender is used for curing the prepolymer.
- the chain extender is an organic compound having at least two active hydrogen groups, and examples of the active hydrogen group include a hydroxyl group, a primary or secondary amino group, and a thiol group (SH).
- the ratio of the isocyanate component, the polyol component, and the chain extender in the present invention can be variously changed depending on the molecular weight of each, the desired physical properties of the laminated polishing pad, and the like.
- the number of isocyanate groups of the isocyanate component relative to the total number of active hydrogen groups (hydroxyl group + amino group) of the polyol component and the chain extender is 0.80 to 1.20. It is preferably 0.99 to 1.15. When the number of isocyanate groups is outside the above range, curing failure occurs and the required specific gravity and hardness cannot be obtained, and the polishing characteristics tend to be deteriorated.
- the polyurethane resin foam can be produced by applying a known urethanization technique such as a melting method or a solution method, but is preferably produced by a melting method in consideration of cost, working environment, and the like.
- the polyurethane resin foam can be produced by either the prepolymer method or the one-shot method.
- an isocyanate-terminated prepolymer is synthesized beforehand from an isocyanate component and a polyol component, and this is reacted with a chain extender.
- the polymer method is preferred because the resulting polyurethane resin has excellent physical properties.
- Examples of the method for producing a polyurethane resin foam include a method of adding hollow beads, a mechanical foaming method, and a chemical foaming method.
- a mechanical foaming method using a silicon surfactant which is a copolymer of polyalkylsiloxane and polyether and does not have an active hydrogen group is preferable.
- stabilizers such as antioxidants, lubricants, pigments, fillers, antistatic agents, and other additives may be added.
- the polyurethane resin foam may be a closed cell type or an open cell type.
- Polyurethane resin foam can be manufactured by batch feeding each component into a container and stirring, or by continuously supplying each component and non-reactive gas to the stirring device and stirring, It may be a continuous production method in which a dispersion is sent out to produce a molded product.
- the prepolymer that is the raw material of the polyurethane resin foam is placed in a reaction vessel, and then a chain extender is added and stirred, and then poured into a casting mold of a predetermined size to produce a block, and the block is shaped like a bowl or a band saw.
- a thin sheet may be used.
- a raw material resin may be dissolved and extruded from a T-die to directly obtain a sheet-like polyurethane resin foam.
- the average cell diameter of the polyurethane resin foam is preferably 30 to 80 ⁇ m, more preferably 30 to 60 ⁇ m. When deviating from this range, the polishing rate tends to decrease, or the planarity of the polished material (wafer) after polishing tends to decrease.
- the specific gravity of the polyurethane resin foam is preferably 0.5 to 1.3.
- the specific gravity is less than 0.5, the surface strength of the polishing layer decreases, and the planarity of the material to be polished tends to decrease.
- the ratio is larger than 1.3, the number of bubbles on the surface of the polishing layer is reduced and planarity is good, but the polishing rate tends to decrease.
- the hardness of the polyurethane resin foam is preferably 40 to 75 degrees as measured by an Asker D hardness meter.
- Asker D hardness is less than 40 degrees, the planarity of the material to be polished is lowered, and when it is larger than 75 degrees, the planarity is good, but the uniformity (uniformity) of the material to be polished is lowered. There is a tendency.
- the polishing surface that comes into contact with the material to be polished of the polishing layer preferably has a concavo-convex structure for holding and renewing the slurry.
- the polishing layer made of foam has many openings on the polishing surface and has the function of holding and updating the slurry.
- the concavo-convex structure is not particularly limited as long as it is a shape that holds and renews slurry. Examples include eccentric circular grooves, radial grooves, and combinations of these grooves.
- these uneven structures are generally regular, but the groove pitch, groove width, groove depth, etc. can be changed for each range in order to make the retention and renewability of the slurry desirable. Is also possible.
- the thickness of the polishing layer is not particularly limited, but is usually about 0.8 to 4 mm, preferably 1.2 to 2.5 mm.
- the polishing layer may be provided with a transparent member for detecting the optical end point while polishing.
- the cushion layer with a base material is provided on one side of the cushion layer so that the thermoplastic resin base material can be peeled off.
- the cushion layer is necessary for achieving both trade-off planarity and uniformity in CMP.
- Planarity refers to the flatness of a pattern portion when a material having fine irregularities generated during pattern formation is polished, and uniformity refers to the uniformity of the entire material to be polished.
- the planarity is improved by the characteristics of the polishing layer, and the uniformity is improved by the characteristics of the cushion layer.
- the cushion layer examples include fiber nonwoven fabrics such as polyester nonwoven fabric, nylon nonwoven fabric, and acrylic nonwoven fabric; resin-impregnated nonwoven fabrics such as polyester nonwoven fabric impregnated with polyurethane; polymer resin foams such as polyurethane foam and polyethylene foam; butadiene rubber and Examples thereof include rubber resins such as isoprene rubber; and photosensitive resins. Of these, it is particularly preferable to use polyurethane foam.
- thermoplastic resin substrate examples include polyester films such as polyethylene terephthalate films; polyolefin films such as polyethylene films and polypropylene films; polyamide films; acrylic resin films; methacrylic resin films; Among these, it is particularly preferable to use a polyethylene terephthalate film.
- the thickness of the thermoplastic resin substrate is not particularly limited, but is preferably 10 to 150 ⁇ m, more preferably 20 to 100 ⁇ m.
- the cushion layer with the base material is, for example, a method of bonding a thermoplastic resin base material to one side of the cushion layer using a peelable adhesive, and a cushion layer on the treated surface of the thermoplastic resin base material subjected to a release surface treatment. It can be produced by a method of forming a cushion layer by applying and curing the forming material.
- a hot melt adhesive sheet is laminated on the surface of the cushion layer with the base material on which the thermoplastic resin base material is not provided.
- the hot melt adhesive that is a raw material of the hot melt adhesive sheet
- known materials can be used without any particular limitation.
- polyester-based, ethylene-vinyl acetate resin-based, polyamide resin-based, polyurethane resin-based, and polyolefin resin-based materials can be mentioned, and it is particularly preferable to use a polyester-based hot melt adhesive.
- the polyester-based hot melt adhesive contains at least a polyester resin as a base polymer and an epoxy resin having two or more glycidyl groups in one molecule as a crosslinking component.
- polyester resin known ones obtained by condensation polymerization of an acid component and a polyol component can be used, and it is particularly preferable to use a crystalline polyester resin.
- the acid component examples include aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and alicyclic dicarboxylic acids. These may be used alone or in combination of two or more.
- aromatic dicarboxylic acid examples include terephthalic acid, isophthalic acid, phthalic anhydride, ⁇ -naphthalenedicarboxylic acid, ⁇ -naphthalenedicarboxylic acid, and ester formers thereof.
- aliphatic dicarboxylic acid examples include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecylenic acid, dodecanedioic acid, and ester formers thereof.
- alicyclic dicarboxylic acid examples include 1,4-cyclohexanedicarboxylic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride and the like.
- unsaturated acids such as maleic acid, fumaric acid and dimer acid
- polyvalent carboxylic acids such as trimellitic acid and pyromellitic acid
- polyol component examples include dihydric alcohols such as aliphatic glycols and alicyclic glycols, and polyhydric alcohols. These may be used alone or in combination of two or more.
- aliphatic glycol examples include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6 -Hexanediol, 1,8-octanediol, 1,9-nonanediol, neopentyl glycol, 3-methylpentanediol, 2,2,3-trimethylpentanediol, diethylene glycol, triethylene glycol, dipropylene glycol, etc. It is done.
- alicyclic glycol examples include 1,4-cyclohexanedimethanol and hydrogenated bisphenol A.
- polyhydric alcohol examples include glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol.
- the crystalline polyester resin can be synthesized by a known method. For example, there are a melt polymerization method in which raw materials and a catalyst are charged and heated at a temperature equal to or higher than the melting point of the product, a solid phase polymerization method in which polymerization is performed at a temperature lower than the melting point of the product, a solution polymerization method using a solvent, and the like. It may be adopted.
- the number average molecular weight of the crystalline polyester resin is preferably 5000 to 50000.
- the number average molecular weight is less than 5,000, the mechanical properties of the hot melt adhesive deteriorate, so that sufficient adhesion and durability cannot be obtained.
- the number average molecular weight exceeds 50,000, the crystalline polyester resin is synthesized. There is a tendency for production problems such as gelation to occur, and the performance as a hot melt adhesive tends to deteriorate.
- epoxy resin examples include bisphenol A type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, stilbene type epoxy resin, biphenyl type epoxy resin, and bisphenol A novolak type epoxy resin.
- Cresol novolac type epoxy resin diaminodiphenylmethane type epoxy resin, polyphenyl base epoxy resin such as tetrakis (hydroxyphenyl) ethane base, fluorene-containing epoxy resin, triglycidyl isocyanurate, heteroaromatic ring (eg triazine ring etc.)
- Aromatic epoxy resin such as epoxy resin contained; aliphatic glycidyl ether type epoxy resin, aliphatic glycidyl ester type epoxy resin, alicyclic glycine Ether type epoxy resin, aromatic epoxy resins such as alicyclic glycidyl ester type epoxy resins. These may be used alone or in combination of two or more.
- the epoxy resin is preferably added in an amount of 2 to 10 parts by weight, more preferably 3 to 7 parts by weight, based on 100 parts by weight of the polyester resin as the base polymer.
- the hot melt adhesive may contain known additives such as softeners such as olefin resins, tackifiers, fillers, stabilizers, and coupling agents. Moreover, you may contain well-known inorganic fillers, such as a talc.
- the melting temperature of the hot melt adhesive is preferably 140 to 170 ° C.
- the specific gravity of the hot melt adhesive is preferably 1.1 to 1.3.
- the melt flow index (MI) of the hot melt adhesive is preferably 16 to 26 g / 10 min under the conditions of 150 ° C. and a load of 2.16 kg.
- the thickness of the hot melt adhesive sheet is preferably 10 to 200 ⁇ m, more preferably 30 to 150 ⁇ m.
- the laminated hot melt adhesive sheet is heated to melt or soften.
- softening it is preferably heated to a temperature within ⁇ 10 ° C. from the melting temperature of the hot melt adhesive, and more preferably heated to a temperature within ⁇ 5 ° C. from the melting temperature.
- the method for melting or softening the hot melt adhesive sheet is not particularly limited, and examples thereof include a method of heating the surface of the hot melt adhesive sheet with an infrared heater while conveying the sheet on a conveyor belt.
- a polishing layer is laminated on the melted or softened hot melt adhesive to produce a laminate.
- a melted or softened hot melt adhesive is applied to the surface of the cushion layer with the base material on which the thermoplastic resin base material is not provided, and an abrasive layer is laminated on the hot melt adhesive that has been melted or softened.
- a laminate may be produced.
- the laminated body After laminating the abrasive layer on the molten or softened hot melt adhesive, it is preferable to press the laminated body between rolls so that the cushion layer and the abrasive layer are in close contact with the melted or softened hot melt adhesive.
- the laminate is cut into the size of the polishing layer to produce a laminated polishing sheet.
- the laminate In the production method of the present invention, it is preferable to cut the laminate into the size of the polishing layer before the melted or softened hot melt adhesive is completely cured. Moreover, it is preferable to cut
- thermoplastic resin substrate is peeled from the laminated abrasive sheet.
- a laminated polishing pad without warping can be obtained. Peeling of the thermoplastic resin substrate may be performed before the hot melt adhesive is completely cured, or may be performed after it is completely cured.
- thermoplastic resin base material After the thermoplastic resin base material is peeled off, a pressure-sensitive double-sided tape having adhesive layers on both sides of the thermoplastic resin sheet may be provided on the surface of the cushion layer from which the thermoplastic resin base material has been peeled (platen adhesive surface).
- thermoplastic resin sheet and the pressure-sensitive adhesive layer can be general ones without particular limitation, but the thermoplastic resin sheet is preferably a PET sheet.
- the thickness of the thermoplastic resin sheet is preferably 10 to 200 ⁇ m, more preferably 20 to 150 ⁇ m.
- a method of providing a pressure-sensitive double-sided tape on the platen adhesive surface of the cushion layer for example, a method of pasting a pressure-sensitive double-sided tape that has been cut in advance to the size of the cushion layer, or a pressure-sensitive double-sided tape pasted on the cushion layer
- a method of cutting the pressure-sensitive double-sided tape to the size of the cushion layer can be mentioned.
- the laminated polishing pad of the present invention may be circular or long.
- the size of the laminated polishing pad can be appropriately adjusted according to the polishing apparatus to be used.
- the diameter is about 30 to 150 cm
- the length is about 5 to 15 m.
- the width is about 60 to 250 cm.
- the semiconductor device is manufactured through a process of polishing the surface of the semiconductor wafer using the polishing pad.
- a semiconductor wafer is generally a laminate of a wiring metal and an oxide film on a silicon wafer.
- the method and apparatus for polishing the semiconductor wafer are not particularly limited.
- a polishing surface plate 2 that supports the laminated polishing pad 1
- a support table (polishing head) 5 that supports the semiconductor wafer 4
- This is performed using a backing material for performing uniform pressurization and a polishing apparatus equipped with a polishing agent 3 supply mechanism.
- the laminated polishing pad 1 is attached to the polishing surface plate 2 by attaching it with a double-sided tape, for example.
- the polishing surface plate 2 and the support base 5 are disposed so that the laminated polishing pad 1 and the semiconductor wafer 4 supported on each of the polishing surface plate 2 and the support base 5 are opposed to each other, and are provided with rotating shafts 6 and 7 respectively. Further, a pressurizing mechanism for pressing the semiconductor wafer 4 against the laminated polishing pad 1 is provided on the support base 5 side. In polishing, the semiconductor wafer 4 is pressed against the laminated polishing pad 1 while rotating the polishing surface plate 2 and the support base 5, and polishing is performed while supplying slurry.
- the flow rate of the slurry, the polishing load, the polishing platen rotation speed, and the wafer rotation speed are not particularly limited and are appropriately adjusted.
- the protruding portion of the surface of the semiconductor wafer 4 is removed and polished flat. Thereafter, a semiconductor device is manufactured by dicing, bonding, packaging, or the like. The semiconductor device is used for an arithmetic processing device, a memory, and the like.
- melt flow index (MI)
- MI melt flow index
- This buffed sheet is punched out with a diameter of 61 cm, and a concentric circle having a groove width of 0.25 mm, a groove pitch of 1.5 mm, and a groove depth of 0.6 mm is formed on the surface using a groove processing machine (manufactured by Techno Corporation). Groove processing was performed to produce a polishing layer.
- a urethane foam composition is applied onto a 50 ⁇ m-thick PET substrate (Burex, manufactured by Teijin DuPont Films, Inc.) after being peeled off, and cured to form a cushion layer (specific gravity: 0.5, Asker C hardness: 50 degrees, thickness) : 125 ⁇ m) to form a cushion layer with a base material.
- a urethane foam composition is applied onto a 50 ⁇ m-thick PET substrate (Burex, manufactured by Teijin DuPont Films, Inc.) after being peeled off, and cured to form a cushion layer (specific gravity: 0.5, Asker C hardness: 50 degrees, thickness) : 125 ⁇ m) to form a cushion layer with a base material.
- Production Example 3 (Preparation of non-peelable cushion layer with base material) A foamed urethane composition was applied on a corona-treated PET base material (Tetron G2 manufactured by Teijin DuPont Films, Inc.) and cured to be a cushion layer (specific gravity: 0.5, Asker C hardness: 50 degrees, thickness) : 125 ⁇ m) to form a cushion layer with a base material.
- a corona-treated PET base material Tetron G2 manufactured by Teijin DuPont Films, Inc.
- Example 1 100 parts by weight of a crystalline polyester resin (Byron GM420, manufactured by Toyobo Co., Ltd.) and two glycidyl groups in one molecule on the cushion layer of the peelable base material-made cushion layer produced in Production Example 2
- a hot-melt adhesive sheet (thickness 50 ⁇ m) made of a polyester-based hot-melt adhesive containing 5 parts by weight of the o-cresol novolac type epoxy resin (Nippon Kayaku Co., Ltd., EOCN4400) having the above is laminated, and an infrared heater Was used to heat the sheet surface to 150 ° C. to melt the hot melt adhesive.
- the polishing layer produced in Production Example 1 was laminated on the melted hot-melt adhesive using a laminating machine, and was pressed through a roll to produce a laminate. Then, when the temperature of the hot melt adhesive is 40 ° C. or higher while cooling the laminate, the laminate is cut into the size of the abrasive layer using a cutter to produce a laminate abrasive sheet. The substrate was peeled off. Then, a pressure sensitive double-sided tape (made by 3M, 442JA) having an adhesive layer on both sides of a PET sheet having a thickness of 25 ⁇ m was pasted on the PET substrate release surface of the cushion layer using a laminator, and a cutter was used.
- a pressure sensitive double-sided tape made by 3M, 442JA
- a pressure sensitive double-sided tape was cut into the size of the polishing layer to produce a laminated polishing pad.
- the melting temperature of the polyester hot melt adhesive was 142 ° C., the specific gravity was 1.22, and the melt flow index was 21 g / 10 min.
- Example 2 A laminated polishing pad was produced in the same manner as in Example 1 except that the sheet surface was heated to 140 ° C. using an infrared heater to soften the hot melt adhesive.
- Example 3 A laminated polishing pad was prepared in the same manner as in Example 1 except that the sheet surface was heated to 170 ° C. using an infrared heater to melt the hot melt adhesive.
- Example 4 A laminated polishing pad was produced in the same manner as in Example 1 except that a pressure-sensitive double-sided tape having an adhesive layer on both sides of a PET sheet having a thickness of 100 ⁇ m was used.
- Example 1 The hot melt adhesive sheet used in Example 1 was laminated on the cushion layer of the non-peelable cushion layer produced in Production Example 3, and the sheet surface was heated to 150 ° C. using an infrared heater. The hot melt adhesive was melted. Thereafter, the polishing layer produced in Production Example 1 was laminated on the melted hot-melt adhesive using a laminating machine, and was pressed through a roll to produce a laminate. Then, the laminate was cooled to completely cure the hot melt adhesive. Thereafter, the laminate was cut into the size of the polishing layer using a cutter.
- the pressure-sensitive double-sided tape (made by 3M, 442JA) is bonded to the PET base material of the cushion layer with the base material using a laminating machine, and the pressure-sensitive double-sided tape is cut into the size of the polishing layer using a cutter.
- a laminated polishing pad was produced.
- Comparative Example 2 The hot melt adhesive sheet used in Example 1 was laminated on a cushion layer made of polyurethane foam having a thickness of 1.25 mm (Nipparei EXG, manufactured by Nippon Kijo Co., Ltd.), and the sheet surface was 150 ° C. using an infrared heater. To melt the hot melt adhesive. Thereafter, the polishing layer produced in Production Example 1 was laminated on the melted hot-melt adhesive using a laminating machine, and was pressed through a roll to produce a laminate. Then, the laminate was cooled to completely cure the hot melt adhesive. Thereafter, the laminate was cut into the size of the polishing layer using a cutter.
- the pressure-sensitive double-sided tape (3M, 442JA) is bonded to the other surface of the cushion layer using a laminating machine, and the pressure-sensitive double-sided tape is cut into the size of the polishing layer using a cutter and laminated. A pad was prepared.
- Comparative Example 3 A laminated polishing pad was produced in the same manner as in Comparative Example 1 except that the surface of the sheet was heated to 120 ° C. using an infrared heater to soften the hot melt adhesive.
- the laminated polishing pads of Examples 1 to 4 had no warpage, no scratches on the cushion layer surface, and had excellent adhesion between the polishing layer and the cushion layer in a high temperature environment.
- the laminated polishing pad of Comparative Example 1 used a cushion layer with a base material that could not be peeled, a large warp occurred. Further, “peeling” occurred at the cut portion of the release paper of the pressure-sensitive double-sided tape. Since the laminated polishing pad of Comparative Example 2 used a cushion layer provided with no base material, wrinkles occurred on the cushion layer surface. Since the laminated polishing pad of Comparative Example 3 had a low temperature when softening the hot melt adhesive, the adhesion between the polishing layer and the cushion layer was insufficient under a high temperature environment.
- the laminated polishing pad of the present invention is used for flattening optical materials such as lenses and reflecting mirrors, silicon wafers, glass substrates for hard disks, aluminum substrates, and materials requiring high surface flatness such as general metal polishing processing. Processing can be performed stably and with high polishing efficiency.
- the laminated polishing pad of the present invention is a process for planarizing a silicon wafer and a device on which an oxide layer, a metal layer, etc. are formed, before further laminating and forming these oxide layers and metal layers. It can be used suitably.
- polishing pad 2 Polishing surface plate 3: Abrasive (slurry) 4: Material to be polished (semiconductor wafer) 5: Support base (polishing head) 6, 7: Rotating shaft
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Abstract
Description
(溶融温度の測定)
ポリエステル系ホットメルト接着剤の溶融温度(融点)は、TOLEDO DSC822(METTLER社製)を用い、昇温速度20℃/minにて測定した。
JIS Z8807-1976に準拠して行った。ポリエステル系ホットメルト接着剤からなる接着剤層を4cm×8.5cmの短冊状(厚み:任意)に切り出したものを比重測定用試料とし、温度23℃±2℃、湿度50%±5%の環境で16時間静置した。測定には比重計(ザルトリウス社製)を用い、比重を測定した。
ASTM-D-1238に準じて150℃、2.16kgの条件で、ポリエステル系ホットメルト接着剤のメルトフローインデックスを測定した。
作製した積層研磨パッドを水平なテーブル上に静置し、パッド端部の最も反りが大きい部分のテーブルからの高さ(浮き)を測定した。
作製した積層研磨パッドのクッション層表面の皺の有無を目視にて観察した。また、感圧型両面テープの離型紙の切断部分に「剥がれ」があるか否かを目視にて観察した。また、研磨層とクッション層の積層状態を下記基準で評価した。
○:研磨層の外周とクッション層の外周が一致している。
×:クッション層の外周が研磨層の外周よりもひとまわり大きく切断されている。
作製した積層研磨パッドから25mm×25mmのサンプルを3枚切り取り、80℃の環境下で各サンプルの研磨層とクッション層を引張り速度300mm/minで引張り、この時のせん断応力(N/25mm)を測定した。サンプル3枚の平均値を表1に示す。せん断応力は250N/25mm以上であることが好ましい。
(研磨層の作製)
容器にトルエンジイソシアネート(2,4-体/2,6-体=80/20の混合物)1229重量部、4,4’-ジシクロヘキシルメタンジイソシアネート272重量部、数平均分子量1018のポリテトラメチレンエーテルグリコール1901重量部、ジエチレングリコール198重量部を入れ、70℃で4時間反応させてイソシアネート末端プレポリマーを得た。
該プレポリマー100重量部及びシリコン系界面活性剤(東レダウコーニングシリコン製、SH-192)3重量部を重合容器内に加えて混合し、80℃に調整して減圧脱泡した。その後、撹拌翼を用いて、回転数900rpmで反応系内に気泡を取り込むように激しく約4分間撹拌を行った。そこへ予め120℃に温度調整したMOCA(イハラケミカル社製、キュアミンMT)26重量部を添加した。該混合液を約1分間撹拌した後、パン型のオープンモールド(注型容器)へ流し込んだ。この混合液の流動性がなくなった時点でオーブン内に入れ、100℃で16時間ポストキュアを行い、ポリウレタン樹脂発泡体ブロックを得た。
約80℃に加熱した前記ポリウレタン樹脂発泡体ブロックをスライサー(アミテック社製、VGW-125)を使用してスライスし、ポリウレタン樹脂発泡体シート(平均気泡径:50μm、比重:0.86、硬度:52度)を得た。次に、バフ機(アミテック社製)を使用して、#120番、#240番、及び#400番のサンドペパーにて順次切削加工し、厚さ2mmになるまで該シートの表面バフ処理をし、厚み精度を整えたシートとした。このバフ処理をしたシートを直径61cmの大きさで打ち抜き、溝加工機(テクノ社製)を用いて表面に溝幅0.25mm、溝ピッチ1.5mm、溝深さ0.6mmの同心円状の溝加工を行って研磨層を作製した。
(剥離可能な基材付きクッション層の作製)
剥離処理した厚み50μmのPET基材(帝人デュポンフィルム社製、ビューレックス)の上に発泡ウレタン組成物を塗布し、硬化させてクッション層(比重:0.5、アスカーC硬度:50度、厚み:125μm)を形成して基材付きクッション層を作製した。
(剥離不可能な基材付きクッション層の作製)
コロナ処理した厚み50μmのPET基材(帝人デュポンフィルム社製、テトロンG2)の上に発泡ウレタン組成物を塗布し、硬化させてクッション層(比重:0.5、アスカーC硬度:50度、厚み:125μm)を形成して基材付きクッション層を作製した。
製造例2で作製した剥離可能な基材付きクッション層のクッション層上に、結晶性ポリエステル樹脂(東洋紡績(株)社製、バイロンGM420)100重量部、及び1分子中にグリシジル基を2つ以上有するo-クレゾールノボラック型エポキシ樹脂(日本化薬(株)社製、EOCN4400)5重量部を含むポリエステル系ホットメルト接着剤からなるホットメルト接着剤シート(厚み50μm)を積層し、赤外ヒーターを用いてシート表面を150℃に加熱してホットメルト接着剤を溶融させた。その後、溶融させたホットメルト接着剤上にラミネート機を用いて製造例1で作製した研磨層を積層し、ロール間に通して圧着して積層体を作製した。そして、積層体を冷却しながらホットメルト接着剤の温度が40℃以上の時に、カッターを用いて積層体を研磨層の大きさに切断して積層研磨シートを作製し、さらに積層研磨シートからPET基材を剥離した。その後、クッション層のPET基材剥離面に、ラミネート機を使用して厚み25μmのPETシートの両面に粘着剤層を有する感圧型両面テープ(3M社製、442JA)を貼り合わせ、カッターを用いて感圧型両面テープを研磨層の大きさに切断して積層研磨パッドを作製した。なお、ポリエステル系ホットメルト接着剤の溶融温度は142℃、比重は1.22、メルトフローインデックスは21g/10minであった。
赤外ヒーターを用いてシート表面を140℃に加熱してホットメルト接着剤を軟化させた以外は実施例1と同様の方法で積層研磨パッドを作製した。
赤外ヒーターを用いてシート表面を170℃に加熱してホットメルト接着剤を溶融させた以外は実施例1と同様の方法で積層研磨パッドを作製した。
厚み100μmのPETシートの両面に粘着剤層を有する感圧型両面テープを用いた以外は実施例1と同様の方法で積層研磨パッドを作製した。
製造例3で作製した剥離不可能な基材付きクッション層のクッション層上に、実施例1で使用したホットメルト接着剤シートを積層し、赤外ヒーターを用いてシート表面を150℃に加熱してホットメルト接着剤を溶融させた。その後、溶融させたホットメルト接着剤上にラミネート機を用いて製造例1で作製した研磨層を積層し、ロール間に通して圧着して積層体を作製した。そして、積層体を冷却してホットメルト接着剤を完全に硬化させた。その後、カッターを用いて積層体を研磨層の大きさに切断した。さらに、基材付きクッション層のPET基材にラミネート機を使用して前記感圧型両面テープ(3M社製、442JA)を貼り合わせ、カッターを用いて感圧型両面テープを研磨層の大きさに切断して積層研磨パッドを作製した。
ポリウレタンフォームからなる厚み1.25mmのクッション層(日本発条社製、ニッパレイEXG)の上に、実施例1で使用したホットメルト接着剤シートを積層し、赤外ヒーターを用いてシート表面を150℃に加熱してホットメルト接着剤を溶融させた。その後、溶融させたホットメルト接着剤上にラミネート機を用いて製造例1で作製した研磨層を積層し、ロール間に通して圧着して積層体を作製した。そして、積層体を冷却してホットメルト接着剤を完全に硬化させた。その後、カッターを用いて積層体を研磨層の大きさに切断した。さらに、クッション層の他面にラミネート機を使用して前記感圧型両面テープ(3M社製、442JA)を貼り合わせ、カッターを用いて感圧型両面テープを研磨層の大きさに切断して積層研磨パッドを作製した。
赤外ヒーターを用いてシート表面を120℃に加熱してホットメルト接着剤を軟化させた以外は比較例1と同様の方法で積層研磨パッドを作製した。
2:研磨定盤
3:研磨剤(スラリー)
4:被研磨材(半導体ウエハ)
5:支持台(ポリシングヘッド)
6、7:回転軸
Claims (10)
- 熱可塑性樹脂基材がクッション層の片面に剥離できるように設けられている基材付きクッション層の前記熱可塑性樹脂基材が設けられていない面に、ホットメルト接着剤シートを積層する工程、積層したホットメルト接着剤シートを加熱して溶融又は軟化させる工程、溶融又は軟化したホットメルト接着剤上に研磨層を積層して積層体を作製する工程、積層体を研磨層の大きさに切断して積層研磨シートを作製する工程、及び積層研磨シートから前記熱可塑性樹脂基材を剥離する工程を含む積層研磨パッドの製造方法。
- 熱可塑性樹脂基材がクッション層の片面に剥離できるように設けられている基材付きクッション層の前記熱可塑性樹脂基材が設けられていない面に、溶融又は軟化したホットメルト接着剤を塗布する工程、溶融又は軟化したホットメルト接着剤上に研磨層を積層して積層体を作製する工程、積層体を研磨層の大きさに切断して積層研磨シートを作製する工程、及び積層研磨シートから前記熱可塑性樹脂基材を剥離する工程を含む積層研磨パッドの製造方法。
- 溶融又は軟化したホットメルト接着剤が完全に硬化する前に積層体を研磨層の大きさに切断して積層研磨シートを作製する請求項1又は2記載の積層研磨パッドの製造方法。
- ホットメルト接着剤の温度が40℃以上の時に積層体を研磨層の大きさに切断して積層研磨シートを作製する請求項1又は2記載の積層研磨パッドの製造方法。
- 前記熱可塑性樹脂基材は、延伸成形されたものである請求項1又は2記載の積層研磨パッドの製造方法。
- ホットメルト接着剤の溶融温度が140~170℃である請求項1又は2記載の積層研磨パッドの製造方法。
- 熱可塑性樹脂基材がポリエチレンテレフタレート基材である請求項1又は2記載の積層研磨パッドの製造方法。
- クッション層の熱可塑性樹脂基材を剥離した面に、熱可塑性樹脂シートの両面に粘着剤層を有する感圧型両面テープを設ける工程を含む請求項1又は2記載の積層研磨パッドの製造方法。
- 請求項1又は2記載の製造方法により得られる積層研磨パッド。
- 請求項9記載の積層研磨パッドを用いて半導体ウエハの表面を研磨する工程を含む半導体デバイスの製造方法。
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US14/370,923 US9457452B2 (en) | 2012-01-17 | 2013-01-09 | Method for producing laminated polishing pad |
CN201380003985.7A CN103987494A (zh) | 2012-01-17 | 2013-01-09 | 层叠抛光垫的制造方法 |
KR1020147010135A KR101641152B1 (ko) | 2012-01-17 | 2013-01-09 | 적층 연마 패드의 제조 방법 |
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DE202011104832U1 (de) * | 2011-08-25 | 2011-10-31 | Charlott Produkte Dr. Rauwald Gmbh | Scheuerpad mit einem Kompositharz als Nutzschicht |
JP6574244B2 (ja) * | 2014-05-07 | 2019-09-11 | キャボット マイクロエレクトロニクス コーポレイション | Cmp用の多層研磨パッド |
TWI626117B (zh) * | 2017-01-19 | 2018-06-11 | 智勝科技股份有限公司 | 研磨墊及研磨方法 |
KR102202076B1 (ko) * | 2018-12-26 | 2021-01-12 | 에스케이씨 주식회사 | 연마패드용 조성물, 연마패드 및 이의 제조방법 |
US11207757B2 (en) * | 2019-06-17 | 2021-12-28 | Skc Solmics Co., Ltd. | Composition for polishing pad, polishing pad and preparation method of semiconductor device |
JP3225815U (ja) * | 2020-01-27 | 2020-04-02 | 丸石産業株式会社 | 不織布からなる2層構造の研磨パッド |
KR102512675B1 (ko) * | 2020-12-30 | 2023-03-21 | 에스케이엔펄스 주식회사 | 연마 패드, 연마 패드의 제조 방법 및 이를 이용한 반도체 소자의 제조 방법 |
CN113334243B (zh) * | 2021-06-03 | 2023-03-31 | 万华化学集团电子材料有限公司 | 化学机械抛光垫、制备方法及其应用 |
US20230390970A1 (en) * | 2022-06-02 | 2023-12-07 | Rohm And Haas Electronic Materials Cmp Holdings, Inc. | Method of making low specific gravity polishing pads |
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TWI510329B (zh) | 2015-12-01 |
SG11201404143SA (en) | 2014-10-30 |
JP2013146801A (ja) | 2013-08-01 |
TW201343327A (zh) | 2013-11-01 |
KR101641152B1 (ko) | 2016-07-20 |
KR20140062164A (ko) | 2014-05-22 |
US20150004879A1 (en) | 2015-01-01 |
US9457452B2 (en) | 2016-10-04 |
JP5893413B2 (ja) | 2016-03-23 |
CN103987494A (zh) | 2014-08-13 |
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