WO2022130839A1 - 研磨用組成物およびこれを用いた研磨方法 - Google Patents
研磨用組成物およびこれを用いた研磨方法 Download PDFInfo
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- WO2022130839A1 WO2022130839A1 PCT/JP2021/041319 JP2021041319W WO2022130839A1 WO 2022130839 A1 WO2022130839 A1 WO 2022130839A1 JP 2021041319 W JP2021041319 W JP 2021041319W WO 2022130839 A1 WO2022130839 A1 WO 2022130839A1
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- Prior art keywords
- polishing
- particle size
- acid
- colloidal silica
- less
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- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 1
- 235000011180 diphosphates Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- CCIVGXIOQKPBKL-UHFFFAOYSA-M ethanesulfonate Chemical compound CCS([O-])(=O)=O CCIVGXIOQKPBKL-UHFFFAOYSA-M 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229940005740 hexametaphosphate Drugs 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical group O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- GTTBQSNGUYHPNK-UHFFFAOYSA-N hydroxymethylphosphonic acid Chemical compound OCP(O)(O)=O GTTBQSNGUYHPNK-UHFFFAOYSA-N 0.000 description 1
- TVZISJTYELEYPI-UHFFFAOYSA-N hypodiphosphoric acid Chemical compound OP(O)(=O)P(O)(O)=O TVZISJTYELEYPI-UHFFFAOYSA-N 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229940045996 isethionic acid Drugs 0.000 description 1
- QPPQHRDVPBTVEV-UHFFFAOYSA-N isopropyl dihydrogen phosphate Chemical compound CC(C)OP(O)(O)=O QPPQHRDVPBTVEV-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001955 polyphenylene ether Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- UAXOELSVPTZZQG-UHFFFAOYSA-N tiglic acid Natural products CC(C)=C(C)C(O)=O UAXOELSVPTZZQG-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- NBXZNTLFQLUFES-UHFFFAOYSA-N triethoxy(propyl)silane Chemical compound CCC[Si](OCC)(OCC)OCC NBXZNTLFQLUFES-UHFFFAOYSA-N 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- 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
Definitions
- the present invention relates to a polishing composition and a polishing method using the same.
- CMP chemical mechanical polishing
- This CMP method is also used for polishing the surface of a resin, and by applying the CMP method, a resin product with few surface defects can be obtained. From this, various studies have been made as polishing compositions for polishing various materials including resins.
- Japanese Unexamined Patent Publication No. 2016-183212 discloses a polishing composition for polishing an object to be polished, which contains a resin having high rigidity and high strength. More specifically, Japanese Patent Application Laid-Open No. 2016-183212 has high rigidity and high strength by a polishing composition containing an abrasive grain having a Mohs hardness and a surface acid amount of a predetermined value or more and a dispersion medium. It is disclosed that even a resin can be polished at a high polishing rate. Further, Japanese Patent Application Laid-Open No. 2016-183212 also discloses that the abrasive grains preferably contain ⁇ -alumina as a main component from the viewpoint of polishing speed.
- Japanese Unexamined Patent Publication No. 2007-06342 discloses a polishing composition for polishing an object to be polished made of synthetic resin. More specifically, Japanese Patent Application Laid-Open No. 2007-063442 describes polishing of synthetic resin by using a polishing composition containing a polyurethane-based polymer surfactant having a specific structure and having a predetermined viscosity range. It is disclosed that it is possible to suppress a decrease in the composition for use and a decrease in the polishing ability. Further, Japanese Patent Application Laid-Open No. 2007-06342 also discloses that it is preferable that the polishing composition further contains ⁇ -alumina as abrasive grains from the viewpoint of polishing speed.
- an object of the present invention is to provide a means for reducing the surface roughness (Ra) while maintaining a high polishing rate in polishing an object to be polished containing a resin.
- the present inventor has made diligent studies to solve the above problems. As a result, the present inventor has found that the above-mentioned problems can be solved by using alumina particles having a specific particle size and colloidal silica particles smaller than the above-mentioned alumina particles in combination as abrasive grains, and have completed the present invention. ..
- a polishing composition used for polishing a polishing object containing a resin and a filler which comprises alumina particles, colloidal silica particles, and a dispersion medium, and the average particle size of the alumina particles is less than 2.8 ⁇ m.
- X to Y indicating a range includes X and Y, and means "X or more and Y or less”. Unless otherwise specified, the operation and physical properties are measured under the conditions of room temperature (range of 20 ° C. or higher and 25 ° C. or lower) / relative humidity of 40% RH or higher and 50% RH or lower.
- One embodiment of the present invention is a polishing composition used for polishing an object to be polished containing a resin and a filler, which comprises alumina particles, colloidal silica particles, and a dispersion medium, and is an average of the alumina particles.
- the present invention relates to a polishing composition having a particle size of less than 2.8 ⁇ m and an average particle size of the colloidal silica particles smaller than the average particle size of the alumina particles.
- the alumina particles are also referred to as “first abrasive grains”
- the colloidal silica particles are also referred to as “second abrasive grains”.
- the polishing composition according to the present invention contains alumina particles having an average particle diameter of less than 2.8 ⁇ m as abrasive grains (first abrasive grains).
- Abrasive grains mechanically polish the object to be polished and improve the polishing speed. Since the alumina particles have sufficient hardness, the effect of improving the polishing speed, particularly the effect of improving the polishing speed of various materials including resin is high.
- the average particle size (average secondary particle size) of the alumina particles is less than 2.8 ⁇ m. If the average particle size of the alumina particles is 2.8 ⁇ m or more, the surface of the object to be polished after polishing becomes excessively rough (Comparative Examples 9 and 10 below).
- the average particle size of the alumina particles is preferably 2.0 ⁇ m or less, more preferably less than 1.5 ⁇ m, still more preferably less than 1.2 ⁇ m, and particularly preferably less than 0.8 ⁇ m.
- the average particle size of the alumina particles is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, still more preferably more than 0.2 ⁇ m, and particularly preferably 0.3 ⁇ m or more.
- a preferable example of the average particle size of the alumina particles is 0.1 ⁇ m or more and 2.0 ⁇ m or less, more preferably 0.2 ⁇ m or more and less than 1.5 ⁇ m, and further preferably more than 0.2 ⁇ m and less than 1.2 ⁇ m. Particularly preferably, it is 0.3 ⁇ m or more and less than 0.8 ⁇ m.
- the average particle size (average secondary particle size) of the alumina particles is the particle size ( D50 ) at which the integrated frequency from the small particle size side is 50% in the volume-based particle size distribution.
- the D 50 of the alumina particles is obtained by a dynamic light scattering method, a laser diffraction method, a laser scattering method, a pore electric resistance method, or the like. Specifically, the value obtained by the measurement method described in the examples described later is adopted.
- the alumina particles are not particularly limited, and examples thereof include alumina particles containing at least one selected from ⁇ -alumina, ⁇ -alumina, ⁇ -alumina, ⁇ -alumina, ⁇ -alumina and ⁇ -alumina.
- the concentration (content) of the alumina particles is not particularly limited, but is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, based on the total mass of the polishing composition. It is more preferably 0.5% by mass or more, particularly preferably 1% by mass or more, and particularly preferably 1.5% by mass or more.
- the concentration (content) of the alumina particles is preferably 25% by mass or less, more preferably 15% by mass or less, and 10% by mass or less with respect to the total mass of the polishing composition. Is even more preferable, less than 9% by mass is even more preferable, and 8% by mass or less is particularly preferable.
- a preferable example of the concentration (content) of the alumina particles is 0.01% by mass or more and 25% by mass or less, and more preferably 0.1% by mass or more and 15% by mass or less with respect to the total mass of the polishing composition. It is more preferably 0.5% by mass or more and 10% by mass or less, particularly preferably 1% by mass or more and less than 9% by mass, and most preferably 1.5% by mass or more and 8% by mass or less.
- both improvement of polishing speed and reduction of surface roughness can be achieved in a more balanced manner.
- Alumina particles can be easily produced by appropriately referring to a known production method (for example, JP-A-2017-190267). Further, as the alumina particles, a commercially available product may be used.
- the alumina particles may be used alone or in combination of two or more.
- the polishing composition according to the present invention contains colloidal silica particles smaller than the average particle size of the alumina particles as the abrasive grains (second abrasive grains). Colloidal silica particles have a lower hardness than alumina particles, which reduces surface roughness. By combining the alumina particles that improve the polishing rate and the colloidal silica particles that reduce the surface roughness in this way, it is possible to achieve a good balance of the trade-off characteristics of improving the polishing rate and reducing the surface roughness. Can be done.
- the average particle size (average secondary particle size) of the colloidal silica particles is smaller than the average particle size (average secondary particle size) of the alumina particles. If the average particle size of the colloidal silica particles is larger than the average particle size of the alumina particles, it becomes difficult to obtain the effect of reducing the surface roughness.
- the average particle size of the colloidal silica particles is preferably 0.20 ⁇ m or less, more preferably less than 0.20 ⁇ m, still more preferably 0.15 ⁇ m or less, and particularly preferably less than 0.10 ⁇ m.
- the average particle size of the colloidal silica particles is preferably 0.005 ⁇ m or more, more preferably 0.02 ⁇ m or more, still more preferably 0.06 ⁇ m or more, and particularly preferably 0.07 ⁇ m or more. Within the above range, both improvement of polishing speed and reduction of surface roughness can be achieved in a more balanced manner.
- a preferable example of the average particle size of the colloidal silica particles is 0.005 ⁇ m or more and 0.20 ⁇ m or less, more preferably 0.02 ⁇ m or more and less than 0.20 ⁇ m, and further preferably 0.06 ⁇ m or more and 0.15 ⁇ m or less. Particularly preferably, it is 0.07 ⁇ m or more and less than 0.10 ⁇ m.
- the average particle size (average secondary particle size) of the colloidal silica particles is a particle size ( D50 ) at which the integrated frequency from the small particle size side is 50% in the volume-based particle size distribution.
- the average particle diameter (D 50 ) of the colloidal silica particles is determined by a dynamic light scattering method, a laser diffraction method, a laser scattering method, a pore electrical resistance method, or the like. Specifically, the value obtained by the measurement method described in the examples described later is adopted.
- the colloidal silica particles preferably have a span value of 0.50 or more and 1.00 or less [(D 90 -D 10 ) / D 50 ], and a span value of more than 0.60 and 1.00 or less [(D 90 -D 90-). It is more preferable to have D 10 ) / D 50 ], and it is further preferable to have a span value [(D 90 ⁇ D 10 ) / D 50 ] of more than 0.80 and 1.00 or less, and 0.85 or more and 0. It is particularly preferable to have a span value of 95 or less [(D 90 ⁇ D 10 ) / D 50 ].
- the span value [(D 90 ⁇ D 10 ) / D 50 ] is an index showing the uniformity of the particle size distribution, and the integrated frequency from the small particle size side is 90% in the volume-based particle size distribution.
- the value (D 90 -D 10 ) obtained by subtracting the particle diameter (D 10 ) at which the integrated frequency from the small particle diameter side is 10% in the volume-based particle size distribution from the particle size (D 90 ) is used. It is obtained by dividing by the particle size (D 50 ) where the integrated frequency from the small particle size side is 50% to the third digit, and rounding off the third digit [(D 90 -D 10 ) / (D 50 )].
- the volume-based particle size distribution is obtained by the measuring method described in Examples described later.
- the span value [(D 90 ⁇ D 10 ) / D 50 ] indicates that the smaller the particle size distribution, the sharper the particle size distribution, and the larger the size, the broader the particle size distribution.
- the ratio of the average particle size (average secondary particle size) of the alumina particles to the average particle size (average secondary particle size) of the colloidal silica particles is More than 1.
- the ratio of the average particle size (average secondary particle size) of the alumina particles to the average particle size (average secondary particle size) of the colloidal silica particles is preferable. It is 1.1 or more, more preferably more than 1.5, still more preferably 2.0 or more, and particularly preferably more than 3.0.
- the ratio of the average particle size (average secondary particle size) of the alumina particles to the average particle size (average secondary particle size) of the colloidal silica particles is preferable. It is 25.0 or less, more preferably less than 20.0, still more preferably less than 15.0, and particularly preferably less than 5.0. Within the above range, both improvement of polishing speed and reduction of surface roughness can be achieved in a more balanced manner.
- a preferred example of the ratio of the average particle size (average secondary particle size) of alumina particles to the average particle size (average secondary particle size) of colloidal silica particles is , 1.1 or more and 25.0 or less, more preferably more than 1.5 and less than 20.0, still more preferably 2.0 or more and less than 15.0, and particularly preferably more than 3.0 and less than 5.0. Is less than.
- the concentration (content) of the colloidal silica particles is not particularly limited, but is preferably 0.5% by mass or more, more preferably 1% by mass or more, based on the total mass of the polishing composition. It is more preferably more than mass%, particularly preferably 2% by mass or more, and particularly preferably 2.5% by mass or more. As the concentration of colloidal silica particles increases, the polishing rate increases.
- the concentration (content) of the colloidal silica particles is preferably 20% by mass or less, more preferably 15% by mass or less, and 10% by mass or less with respect to the total mass of the polishing composition. It is more preferably less than 10% by mass, and particularly preferably 8% by mass or less.
- a preferable example of the concentration (content) of the colloidal silica particles is preferably 0.5% by mass or more and 20% by mass or less, and 1% by mass or more and 15% by mass or less with respect to the total mass of the polishing composition. It is more preferably more than 1% by mass and 10% by mass or less, particularly preferably 2% by mass or more and less than 10% by mass, and 2.5% by mass or more and 8% by mass or less. Especially preferable. Within the above range, both improvement of polishing speed and reduction of surface roughness can be achieved in a more balanced manner.
- the mixed mass ratio of the alumina particles to the colloidal silica particles is not particularly limited, but is preferably 0.1 or more, more preferably. Is 0.2 or more, more preferably more than 0.2, and particularly preferably 0.3 or more.
- the mixed mass ratio of the alumina particles to the colloidal silica particles is preferably 10.0 or less, more preferably less than 8.0. , More preferably 5.0 or less, and particularly preferably less than 5.0. Within the above range, both improvement of polishing speed and reduction of surface roughness can be achieved in a more balanced manner.
- a preferable example of the mixed mass ratio of alumina particles to colloidal silica particles is 0.1 or more and 10.0 or less, more preferably 0. It is .2 or more and less than 8.0, more preferably more than 0.2 and less than 5.0, and particularly preferably 0.3 or more and less than 5.0.
- Colloidal silica particles can be easily produced by appropriately referring to known production methods. Further, as the colloidal silica particles, a commercially available product may be used. Examples of the method for producing colloidal silica include a sodium silicate method, an alkoxide method, and a sol-gel method, and any colloidal silica produced by any of the production methods is suitably used as the colloidal silica of the present invention.
- the raw material colloidal silica is colloidal silica obtained by the sodium silicate method.
- the sodium silicate method is typically a method of using active silicate obtained by ion exchange of an alkaline silicate aqueous solution such as water glass as a raw material and growing particles thereof.
- the raw material colloidal silica is colloidal silica obtained by the alkoxide method.
- the alkoxide method is typically a method using alkoxysilane as a raw material and hydrolyzing and condensing it.
- colloidal silica particles used is not particularly limited, but for example, surface-modified colloidal silica can be used.
- colloidal silica particles may have a cationic group.
- colloidal silica having a cationic group colloidal silica in which an amino group is immobilized on the surface is preferably mentioned.
- the method for producing colloidal silica having such a cationic group include aminoethyltrimethoxysilane, aminopropyltrimethoxysilane, aminoethyltriethoxysilane, and amino as described in JP-A-2005-162533.
- Examples thereof include a method of immobilizing a silane coupling agent having an amino group such as propyltriethoxysilane, aminopropyldimethylethoxysilane, aminopropylmethyldiethoxysilane, and aminobutyltriethoxysilane on the surface of abrasive grains.
- a silane coupling agent having an amino group such as propyltriethoxysilane, aminopropyldimethylethoxysilane, aminopropylmethyldiethoxysilane, and aminobutyltriethoxysilane.
- Colloidal silica particles may have an anionic group.
- a colloidal silica having an anionic group a colloidal silica in which an anionic group such as a carboxylic acid group, a sulfonic acid group, a phosphonic acid group and an aluminic acid group is immobilized on the surface is preferably mentioned.
- the method for producing such colloidal silica having an anionic group is not particularly limited, and examples thereof include a method of reacting a silane coupling agent having an anionic group at the terminal with colloidal silica.
- sulfonic acid group is immobilized on colloidal silica, for example, "Sulfonic acid-functionalized silica thrugh of thiol groups", Chem. Commun. It can be carried out by the method described in 246-247 (2003). Specifically, a silane coupling agent having a thiol group such as 3-mercaptopropyltrimethoxysilane is coupled to colloidal silica, and then the thiol group is oxidized with hydrogen hydrogen to fix the sulfonic acid group to the surface. Oxidized colloidal silica can be obtained.
- a silane coupling agent having a thiol group such as 3-mercaptopropyltrimethoxysilane
- the carboxylic acid group is to be immobilized on colloidal silica
- "Novell Silane Coupling Agents Contining a Photolabile 2-Nitrobenzyl Ester for Introduction of a ChemistryGrosisGor -229 (2000) can be carried out by the method described.
- a silane coupling agent containing a photoreactive 2-nitrobenzyl ester can be coupled to colloidal silica and then irradiated with light to obtain colloidal silica having a carboxylic acid group immobilized on the surface. can.
- the colloidal silica particles may be used alone or in combination of two or more.
- the polishing composition according to the present invention contains a dispersion medium.
- the dispersion medium disperses or dissolves each component.
- the dispersion medium preferably contains water. Further, from the viewpoint of preventing the influence of impurities on other components of the polishing composition, it is preferable to use water having the highest possible purity. Specifically, pure water, ultrapure water, or distilled water from which foreign substances have been removed through a filter after removing impurity ions with an ion exchange resin is preferable. Further, as the dispersion medium, an organic solvent or the like may be further contained for the purpose of controlling the dispersibility of other components of the polishing composition.
- the polishing composition according to one embodiment of the present invention preferably further contains a pH adjuster.
- the pH adjuster can contribute to the pH adjustment of the polishing composition by selecting the type and the amount of the addition.
- the pH adjusting agent is not particularly limited as long as it is a compound having a pH adjusting function, and a known compound can be used.
- the pH adjusting agent is not particularly limited as long as it has a pH adjusting function, and examples thereof include acids and alkalis.
- the acid either an inorganic acid or an organic acid may be used.
- the inorganic acid is not particularly limited, and examples thereof include sulfuric acid, nitric acid, boric acid, carbonic acid, hypophosphoric acid, phosphoric acid, and phosphoric acid.
- the organic acid is not particularly limited, but formic acid, acetic acid, propionic acid, butyric acid, valeric acid, 2-methylbutyric acid, n-hexanoic acid, 3,3-dimethylbutyric acid, 2-ethylbutyric acid, 4-methylpentanoic acid, n-heptanoic acid, 2-methylhexanoic acid, n-octanoic acid, 2-ethylhexanoic acid, benzoic acid, glycolic acid, salicylic acid, glyceric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid , Maleic acid, phthalic acid, malic acid, tartaric acid, carboxylic acids such as citric acid and lactic acid, methanesulfonic acid, ethanesulfonic acid and isethionic acid and the like.
- organic acids are preferable, and malic acid, citric acid, cit
- the alkali is not particularly limited, and examples thereof include hydroxides of alkali metals such as potassium hydroxide, quaternary ammonium salts such as ammonia, tetramethylammonium and tetraethylammonium, and amines such as ethylenediamine and piperazine. Among these, potassium hydroxide and ammonia are preferable.
- the pH adjuster can be used alone or in combination of two or more.
- the content of the pH adjuster is not particularly limited, and is preferably an amount that allows the pH value to be within a preferable range described later.
- the polishing composition according to the present invention contains abrasive grains, chelating agents, thickeners, oxidizing agents, dispersants, surface protectants, wetting agents, surfactants, etc. other than the above, as long as the effects of the present invention are not impaired.
- Known components such as an anticorrosive agent (rust preventive agent), an antiseptic agent, and an antifungal agent, and a dispersion stabilizer described later may be further contained.
- the content of other components may be appropriately set according to the purpose of addition.
- the dispersion stabilizer includes at least one phosphorus-containing acid selected from the group consisting of phosphoric acid and its condensate, organic phosphoric acid, phosphonic acid and organic phosphonic acid.
- -Refers to an organic compound having at least one P ( O) (OH) 2 ).
- phosphoric acid and its condensate and organic phosphoric acid are also simply referred to as “phosphoric acid-based acid”
- phosphonic acid and organic phosphonic acid are simply referred to as "phosphonic acid-based acid”. Also called.
- These phosphorus-containing acids have a function of modifying (negatively turning) the zeta potential of the alumina particles to minus (-). Then, the alumina particles having a negative ( ⁇ ) zeta potential repel each other electrostatically, so that aggregation can be suppressed and the redispersibility of the concentrated liquid can be improved.
- the phosphorus-containing acid examples include phosphoric acid (orthric acid), pyrophosphate, tripolyphosphate, tetrapolyphosphate, hexametaphosphate, methylacid phosphate, ethylacid phosphate, ethylglycol acid phosphate, isopropylacid phosphate, and phytic acid.
- phosphonic acid-based acids are preferable, organic phosphonic acids are more preferable, and 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) is preferable from the viewpoint of improving the balance between redispersibility, polishing rate and etching rate.
- HEDP 1-hydroxyethylidene-1,1-diphosphonic acid
- Nitrilotris methylenephosphonic acid
- EDTMP ethylenediaminetetra
- the phosphorus-containing acid only one type may be used alone, or two or more types may be used in combination.
- the pH of the polishing composition according to this embodiment is preferably 1 or more and 6 or less or 8 or more and 12 or less, more preferably 1 or more and less than 5 or 8 or more and 11 or less, and 1.5 or more and less than 4. It is particularly preferable to have. Within the above range, both improvement of polishing speed and reduction of surface roughness can be achieved in a more balanced manner. In particular, when the polishing composition is acidic, the polishing speed can be further improved.
- the pH of the polishing composition is determined by the measuring method described in Examples described later.
- the method for producing the polishing composition is not particularly limited, and for example, alumina particles, colloidal silica particles, a dispersion medium (preferably water), and other components as necessary are stirred and mixed.
- a manufacturing method including the above can be appropriately adopted. Since the alumina particles, colloidal silica particles, dispersion medium and other components are the same as those described in the above section ⁇ Polishing Composition>, description thereof will be omitted here.
- the temperature at which each component is mixed is not particularly limited, but is preferably 10 to 40 ° C., and may be heated in order to increase the dissolution rate. Further, the mixing time is not particularly limited.
- the polishing object to be polished by the polishing composition according to the present invention contains a resin and a filler.
- the resin is not particularly limited, and is, for example, an acrylic resin such as poly (meth) acrylate, a methyl methacrylate-methyl acrylate copolymer, and a urethane (meth) acrylate resin; an epoxy resin; an ultrahigh molecular weight.
- an acrylic resin such as poly (meth) acrylate, a methyl methacrylate-methyl acrylate copolymer, and a urethane (meth) acrylate resin
- an epoxy resin an ultrahigh molecular weight.
- Olefin resin such as polyethylene (UHPE); phenol resin; polyamide resin (PA); polyimide resin (PI); polyethylene terephthalate (PET), polybutylene sulfide (PBT), polyester resin such as unsaturated polyester resin; polycarbonate resin (PC) ); Polyphenylene sulfide resin; Polystyrene resin such as syndiotactic polystyrene (SPS); Polynorbornene resin; Polybenzoxazole (PBO); Polyacetal (POM); Modified polyphenylene ether (m-PPE); ); Polysulfone (PSF); Polyethersulfone (PES); Polyphenylene sulfide (PPS); Polyetheretherketone (PEEK); Polyetherimide (PEI); Fluororesin; Liquid crystal polymer (LCP) and the like.
- UHPE polyethylene
- PA polyamide resin
- PI polyimide resin
- PET polyethylene terephthalate
- the resin preferably has a cyclic molecular structure. That is, in the preferred embodiment of the present invention, the resin has a cyclic molecular structure.
- the resin having such a cyclic molecular structure an epoxy resin, a polycarbonate resin, and a polyphenylene sulfide resin are preferably used. The above resins can be used alone or in combination of two or more. Further, the resin may be one cured by a curing agent.
- the material constituting the filler is not particularly limited, but for example, glass, carbon, calcium carbonate, magnesium carbonate, barium sulfate, magnesium sulfate, aluminum silicate, titanium oxide, alumina, zinc oxide, silica (silicon dioxide), and the like.
- examples thereof include kaolin, talc, glass beads, sericite active white clay, bentonite, aluminum nitride, polyester, polyurethane and rubber. Of these, glass and silica are preferable, and silica is particularly preferable, from the viewpoint of processability.
- the shape of the filler may be powdery, spherical, fibrous, needle-like, etc. Of these, from the viewpoint of processability, spherical and fibrous are preferable, and spherical is more preferable.
- the size of the filler is not particularly limited.
- the average particle size is, for example, 0.01 to 50 ⁇ m, preferably 1.0 to 6.5 ⁇ m.
- the major axis is, for example, 100 to 300 ⁇ m, preferably 150 to 250 ⁇ m, and the minor axis is, for example, 1 to 30 ⁇ m, preferably 10 to 20 ⁇ m.
- the above filler can be used alone or in combination of two or more.
- the object to be polished may contain a material different from these as the polishing surface, in addition to the resin and the filler.
- a material different from these as the polishing surface examples include copper (Cu), aluminum (Al), tantalum (Ta), tantalum nitride (TaN), titanium (Ti), titanium nitride (TiN), nickel (Ni), ruthenium (Ru), and the like.
- Examples thereof include cobalt (Co), tungsten (W), and tungsten nitride (WN).
- the object to be polished may be prepared from a resin and a filler, or may be prepared using a commercially available product.
- Commercially available products include interlayer insulating material "Ajinomoto Build-up Film” (ABF) GX13, GX92, GX-T31, GZ41 (all Ajinomoto Fine Techno Co., Ltd.); Polycarbonate (PC) resin "Panlite (registered trademark)” glass. Fiber reinforced grades (both Teijin Co., Ltd.); GF reinforced Durafide (registered trademark) PPS, GF / inorganic filler reinforced Durafide (registered trademark) PPS (both Polyplastics Co., Ltd.) and the like.
- a polishing method comprising a step of polishing an object to be polished using the above-mentioned polishing composition.
- Preferred examples of the object to be polished according to this embodiment are the same as those mentioned in the description of [Object to be polished].
- a preferred embodiment of the polishing method according to the present invention includes a step of polishing an object to be polished containing a resin and a filler by using the above-mentioned polishing composition.
- a general polishing device When polishing the object to be polished using the polishing composition, it can be performed using the equipment and conditions used for normal polishing.
- Examples of a general polishing device include a single-sided polishing device and a double-sided polishing device.
- a surface plate having a polishing pad attached to one side of the object to be polished is generally held by using a holder called a carrier and supplying a polishing composition from above.
- One side of the object to be polished is polished by pressing and rotating the surface plate.
- a holding tool called a carrier is used to hold an object to be polished, and while supplying a polishing composition from above, a surface plate having a polishing pad attached to the facing surface of the object to be polished.
- polishing pad and the polishing composition are polished by the physical action due to friction between the polishing object and the polishing object, and the chemical action that the polishing composition brings to the polishing object.
- a porous body such as a non-woven fabric, polyurethane, or suede can be used without particular limitation. It is preferable that the polishing pad is processed so that the polishing liquid collects.
- polishing conditions include a polishing load, a surface plate rotation speed, a carrier rotation speed, a flow rate of the polishing composition, a polishing time, and the like.
- polishing load is preferably 0.1 psi (0.69 kPa) or more and 10 psi (69 kPa) or less per unit area of the object to be polished. It is preferably 0.5 psi (3.5 kPa) or more and 8.0 psi (55 kPa) or less, and more preferably 1.0 psi (6.9 kPa) or more and 6.0 psi (41 kPa) or less.
- the surface plate rotation speed and the carrier rotation speed are preferably 10 rpm (0.17s -1 ) to 500 rpm (8.3s -1 ).
- the supply amount of the polishing composition may be any supply amount (flow rate) that covers the entire polishing object, and may be adjusted according to conditions such as the size of the polishing object.
- the method of supplying the polishing composition to the polishing pad is also not particularly limited, and for example, a method of continuously supplying the polishing composition with a pump or the like is adopted. Further, the processing time is not particularly limited as long as the desired processing result can be obtained, but it is preferably a shorter time due to the high polishing rate.
- another aspect of the present invention relates to a method for manufacturing a polished object, which comprises a step of polishing the object to be polished by the above-mentioned polishing method.
- Preferred examples of the object to be polished according to this embodiment are the same as those mentioned in the description of [Object to be polished].
- a method for manufacturing an electronic circuit substrate which comprises polishing an object to be polished containing a resin and a metal by the above-mentioned polishing method.
- Alumina particles (first abrasive grains) are measured using a particle size distribution measuring device (Microtrac particle size distribution measuring device MT3300EX II manufactured by Microtrac Bell Co., Ltd.) to obtain a volume-based particle size distribution. rice field.
- a particle size distribution measuring device Microtrac particle size distribution measuring device MT3300EX II manufactured by Microtrac Bell Co., Ltd.
- the particle size at which the integrated frequency from the small particle size side is 50% was defined as the average particle size ( D50 ) of the alumina particles.
- the colloidal silica particles (second abrasive grains) are measured using a particle size distribution measuring device (nanoparticle size measuring device NANOTRAC WAVE II UPA-UT151 manufactured by Microtrac Bell Co., Ltd.), and the particle size distribution based on the volume is obtained. I asked. In the obtained particle size distribution, the particle size at which the integrated frequency from the small particle size side is 50% was defined as the average particle size ( D50 ) of the colloidal silica particles.
- colloidal silica particles second abrasive grains
- 100 samples were randomly selected from images measured with a scanning electron microscope (SEM) (product name: SU8000 manufactured by Hitachi High-Tech Co., Ltd.), and the major axis and minor axis were measured respectively. Then, the average major axis ( ⁇ m) and the average minor axis ( ⁇ m) were calculated.
- SEM scanning electron microscope
- the average major axis is divided by the average minor axis to calculate the aspect ratio (average major axis / average minor axis) of the colloidal silica particles. did.
- pH value of the polishing composition was confirmed by a pH meter (model number: LAQUA (registered trademark) manufactured by HORIBA, Ltd.).
- Example 1 to 14 and Comparative Examples 1 to 14 The first abrasive grains and the second abrasive grains or the first abrasive grains shown in Table 1 and water were stirred and mixed in the amounts shown in Table 1 to prepare a polishing composition (mixing temperature: about 25 ° C.). , Mixing time: about 30 minutes).
- a polishing composition (mixing temperature: about 25 ° C.). , Mixing time: about 30 minutes).
- the pH was adjusted to the pH shown in Table 1 using a 30 mass% malic acid aqueous solution.
- Example 9 the pH was adjusted to the pH shown in Table 1 using a 48 mass% potassium hydroxide aqueous solution.
- “Alumina” in Table 1 below is ⁇ -alumina particles.
- the colloidal silica particles having an average particle diameter of 0.08 ⁇ m are produced by the sodium silicate method, have an average particle diameter (D 50 ) of 0.08 ⁇ m, and have a span value [(D 90- ). D 10 ) / D 50 ] was 0.89.
- Colloidal silica particles having an average particle size of 0.02 ⁇ m are produced by the sodium silicate method, have an average particle size (D 50 ) of 0.02 ⁇ m, and have a span value [(D 90 ⁇ D 10 ) / D 50 ].
- Colloidal silica particles having an average particle size of 0.05 ⁇ m are produced by the sodium silicate method, have an average particle size (D 50 ) of 0.05 ⁇ m, and have a span value [(D 90 ⁇ D 10 ) / D 50 ].
- Colloidal silica particles having an average particle size of 0.2 ⁇ m are produced by an alkoxide method, have an average particle size (D 50 ) of 0.2 ⁇ m, and have a span value [(D 90 ⁇ D 10 ) / D 50 ] of 0. It was .98.
- the polishing rate and the surface roughness (Ra) are evaluated according to the methods described in the following [polishing rate (polishing rate) 1] and [surface roughness (Ra)], respectively. did.
- the results are shown in Table 1 below.
- the "mixing ratio” is the mixing mass ratio of the first abrasive grains to the second abrasive grains (addition amount of the first abrasive grains (mass%) / addition amount of the second abrasive grains (mass%)).
- the "particle diameter ratio” represents the average particle diameter ratio of the first abrasive grains to the second abrasive grains (average particle diameter of the first abrasive grains ( ⁇ m) / average particle diameter of the second abrasive grains ( ⁇ m)).
- the “rate of increase” is a value calculated based on the following formula, and indicates the rate of increase (%) of the polishing rate with respect to only an equal amount of alumina.
- Polishing device Small tabletop polishing machine (EJ380IN manufactured by Nippon Engis Co., Ltd.) Surface plate diameter: 380 [mm] Polishing pad: Hard polyurethane pad (IC1010 manufactured by Nitta DuPont Co., Ltd.) Platen (surface plate) rotation speed: 90 [rpm] Head (carrier) rotation speed: 90 [rpm] Polishing pressure: 3.0 [psi] (210 [g / cm 2 ]) Flow rate of polishing composition: 20 [ml / min] Polishing time: 5 [min].
- the thickness change amount ⁇ d [m] of the polishing object before and after polishing can be obtained. Calculated; 4. The amount of change in thickness of the object to be polished ⁇ d [m] before and after polishing was divided by the polishing time t [min], and the unit was further converted to [ ⁇ m / min]. This value was defined as the polishing rate v [ ⁇ m / min]. The higher the polishing rate is, the more preferable it is, but if it is 0.3 ⁇ m / min or more, it is acceptable, and it is desirable that it is more than 0.45 ⁇ m / min.
- the surface roughness Ra of the object to be polished (epoxy resin) after polishing used for the evaluation of the polishing rate was measured using a non-contact surface shape measuring machine (laser microscope, VK-X200, manufactured by Keyence Co., Ltd.).
- the surface roughness Ra is a parameter indicating the average amplitude of the roughness curve in the height direction, and indicates the arithmetic mean of the height of the surface of the object to be polished within a constant field of view.
- the measurement range (viewing angle) by the non-contact surface shape measuring machine was 95 ⁇ m ⁇ 72 ⁇ m.
- the polishing rate is also used. The result was that at least one of (polishing speed) and surface roughness was inferior.
- Example 15 to 16 A polishing composition was prepared in the same manner as in Example 1. Separately, a polishing composition was prepared in the same manner as in Comparative Example 1 above.
- the polishing rate was evaluated by changing the polishing target according to the following method. Further, the surface roughness (Ra) of the polishing composition obtained above was evaluated in the same manner as in the method described in the above [Surface Roughness (Ra)]. The results are shown in Table 2 below. In Table 2 below, the results of Example 1 and Comparative Example 1 are also shown.
- the polishing rate (polishing rate) of the object to be polished 2 was evaluated using the above-mentioned polishing composition (Example 15, Comparative Example 15).
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Abstract
Description
本発明の一形態は、アルミナ粒子と、コロイダルシリカ粒子と、分散媒と、を含む、樹脂およびフィラーを含有する研磨対象物の研磨に用いられる研磨用組成物であって、前記アルミナ粒子の平均粒子径は2.8μm未満であり、前記コロイダルシリカ粒子の平均粒子径は前記アルミナ粒子の平均粒子径より小さい、研磨用組成物に関する。上記のような特定のアルミナ粒子及びコロイダルシリカ粒子を砥粒として組み合わせて使用することにより、樹脂及びフィラーを含む研磨対象物の研磨において、高い研磨速度を維持しつつ、表面粗さ(Ra)を低減することができる。以下、本発明に係る研磨用組成物に含まれる各成分について詳細に説明する。なお、以下では、アルミナ粒子を「第一砥粒」と、コロイダルシリカ粒子を「第二砥粒」とも称する。
<アルミナ粒子(第一砥粒)>
本発明に係る研磨用組成物は、砥粒(第一砥粒)として、平均粒子径が2.8μm未満であるアルミナ粒子を含む。砥粒は、研磨対象物を機械的に研磨し、研磨速度を向上させる。そして、アルミナ粒子は、十分な硬度を有することから、研磨速度の向上効果、特に樹脂を含む種々の材料の研磨速度の向上効果が高い。
本発明に係る研磨用組成物は、砥粒(第二砥粒)として、アルミナ粒子の平均粒子径より小さいコロイダルシリカ粒子を含む。コロイダルシリカ粒子はアルミナ粒子に比して硬度が低いため、表面粗さを低減させる。このように研磨速度を向上させるアルミナ粒子と表面粗さを低減させるコロイダルシリカ粒子とを組み合わせることによって、研磨速度の向上および表面粗さの低減というトレードオフの関係にある特性をバランスよく両立させることができる。
本発明に係る研磨用組成物は、分散媒を含む。分散媒は、各成分を分散または溶解させる。
本発明の一実施形態に係る研磨用組成物は、pH調整剤をさらに含むことが好ましい。pH調整剤は、その種類および添加量を選択することで研磨用組成物のpHの調整に寄与しうる。
本発明に係る研磨用組成物は、本発明の効果を損なわない範囲において、上記以外の砥粒、キレート剤、増粘剤、酸化剤、分散剤、表面保護剤、濡れ剤、界面活性剤、防食剤(防錆剤)、防腐剤、防カビ剤等の公知の成分や、後述する分散安定化剤をさらに含有してもよい。他の成分の含有量は、その添加目的に応じて適宜設定すればよい。ここで、分散安定化剤としては、リン酸およびその縮合物、有機リン酸、ホスホン酸ならびに有機ホスホン酸からなる群から選択される少なくとも1種のリン含有酸を含む。本明細書において、「有機リン酸」とは、リン酸基(-OP(=O)(OH)2)を少なくとも1つ有する有機化合物を指し、「有機ホスホン酸」とは、ホスホン酸基(-P(=O)(OH)2)を少なくとも1つ有する有機化合物を指す。また、本明細書において、「リン酸およびその縮合物ならびに有機リン酸」を、単に「リン酸系の酸」とも称し、「ホスホン酸および有機ホスホン酸」を、単に「ホスホン酸系の酸」とも称する。これらのリン含有酸は、アルミナ粒子のゼータ電位をマイナス(-)に改質する(陰転する)機能を有する。そして、ゼータ電位がマイナス(-)となったアルミナ粒子が互いに静電反発することにより、凝集が抑制され、濃縮液の再分散性が向上しうる。
本形態に係る研磨用組成物のpHは、1以上6以下または8以上12以下であることが好ましく、1超5未満または8超11以下であることがより好ましく、1.5以上4未満であることが特に好ましい。上記範囲であると、研磨速度の向上および表面粗さの低減をよりバランスよく両立できる。特に研磨用組成物が酸性であると、研磨速度をより向上できる。研磨用組成物のpHは、後述の実施例に記載された測定方法により求められる。
研磨用組成物の製造方法(調製方法)は、特に制限されず、例えば、アルミナ粒子と、コロイダルシリカ粒子と、分散媒(好ましくは水)と、必要に応じて他の成分とを、攪拌混合することを含む製造方法が適宜採用されうる。なお、アルミナ粒子と、コロイダルシリカ粒子、分散媒および他の成分は、上記<研磨用組成物>の項で説明したのと同様であるため、ここでは説明を省略する。
本発明に係る研磨用組成物によって研磨される研磨対象物は、樹脂およびフィラーを含む。
本発明の他の一形態は、上記の研磨用組成物を用いて、研磨対象物を研磨する工程を有する、研磨方法に関する。本形態に係る研磨対象物の好ましい例は、[研磨対象物]の説明で挙げたものと同様である。例えば、研磨面に樹脂およびフィラーを含む研磨対象物を研磨することが好ましい。すなわち、本発明に係る研磨方法の好ましい形態は、上記の研磨用組成物を用いて、樹脂およびフィラーを含む研磨対象物を研磨する工程を有する。
[アルミナ粒子の平均粒子径]
アルミナ粒子(第一砥粒)について、粒子径分布測定装置(マイクロトラック・ベル株式会社製、マイクロトラック(Microtrac)粒度分布測定装置 MT3300EX II)を用いて測定を行い、体積基準の粒度分布を求めた。得られた粒度分布において、小粒子径側からの積算度数が50%となる粒子径をアルミナ粒子の平均粒子径(D50)とした。
コロイダルシリカ粒子(第二砥粒)について、粒子径分布測定装置(マイクロトラック・ベル株式会社製、ナノ粒子径測定装置 NANOTRAC WAVE II UPA-UT151)を用いて測定を行い、体積基準の粒度分布を求めた。得られた粒度分布において、小粒子径側からの積算度数が50%となる粒子径をコロイダルシリカ粒子の平均粒子径(D50)とした。
コロイダルシリカ粒子(第二砥粒)について、走査型電子顕微鏡(SEM)(株式会社日立ハイテク製 製品名:SU8000)で測定した画像からランダムで100個のサンプルを選び、それぞれ長径および短径を測定し、平均長径(μm)および平均短径(μm)を算出した。続いて、得られた平均長径(μm)および平均短径(μm)の値を用いて、平均長径を平均短径で除し、コロイダルシリカ粒子のアスペクト比(平均長径/平均短径)を算出した。
研磨用組成物のpH値は、pHメーター(株式会社 堀場製作所製 型番:LAQUA(登録商標))によって確認した。
表1に記載の第一砥粒および第二砥粒または第一砥粒、ならびに水を、表1に記載の量で攪拌・混合し、研磨用組成物を調製した(混合温度:約25℃、混合時間:約30分間)。なお、実施例1~8および10~14、ならびに比較例1~14では、30質量%リンゴ酸水溶液を用いて表1に記載のpHに調節した。また、実施例9では、48質量%水酸化カリウム水溶液を用いて表1に記載のpHに調節した。下記表1中の「アルミナ」は、α-アルミナ粒子である。
[研磨レート(研磨速度)1]
研磨対象物として、エポキシ樹脂およびフィラー(球状シリカ、平均粒子径=1.0μm)をフィラー含有量が70質量%になるように混合したものを準備した(研磨対象物1;比重:1.9g/cm3)。続いて、各研磨用組成物を用いて、下記の研磨装置および研磨条件にて研磨対象物(基板)を研磨し、下記(研磨速度評価方法)に従って研磨対象物1の研磨レート(研磨速度)を評価した。
研磨装置:小型卓上研磨機(日本エンギス株式会社製 EJ380IN)
定盤径:380〔mm〕
研磨パッド:硬質ポリウレタン製パッド(ニッタ・デュポン株式会社製 IC1010)
プラテン(定盤)回転速度:90〔rpm〕
ヘッド(キャリア)回転速度:90〔rpm〕
研磨圧力:3.0〔psi〕(210〔g/cm2〕)
研磨用組成物の流量:20〔ml/min〕
研磨時間:5〔min〕。
1.分析天秤XS205(メトラー・トレド株式会社製)を用いて、研磨前後の研磨対象物の質量を測定して、これらの差から、研磨前後の研磨対象物の質量変化量ΔM〔kg〕を算出した;
2.研磨前後の研磨対象物の質量変化量ΔM〔kg〕を研磨対象物の比重(研磨対象となる材料の比重)で除することで、研磨前後の研磨対象物の体積変化量ΔV〔m3〕を算出した;
3.研磨前後の研磨対象物の体積変化量ΔV〔m3〕を研磨対象物の研磨面の面積S〔m2〕で除することで、研磨前後の研磨対象物の厚み変化量Δd〔m〕を算出した;
4.研磨前後の研磨対象物の厚み変化量Δd〔m〕を研磨時間t〔min〕で除し、さらに単位を〔μm/min〕へと換算した。この値を研磨レートv〔μm/min〕とした。なお、研磨レートは高いほど好ましいが、0.3μm/min以上であれば許容でき、0.45μm/min超であると望ましい。
上記研磨速度の評価に用いた研磨後の研磨対象物(エポキシ樹脂)の表面粗さRaを、非接触表面形状測定機(レーザー顕微鏡、VK-X200、株式会社キーエンス製)を用いて測定した。なお、表面粗さRaは、粗さ曲線の高さ方向の振幅の平均を示すパラメーターであって、一定視野内での研磨対象物表面の高さの算術平均を示す。非接触表面形状測定機による測定範囲(視野角)は、95μm×72μmとした。なお、表面粗さ(Ra)は小さいほど好ましいが、100nm未満であれば許容でき、50nm未満であると望ましい。
実施例1と同様にして、研磨用組成物を調製した。別途、上記比較例1と同様にして、研磨用組成物を調製した。
[研磨レート(研磨速度)2]
研磨対象物として、ポリカーボネート樹脂およびフィラー(ガラス繊維、長径=218μm、短径=13μm)をフィラー含有量が30質量%になるように混合したものを準備した(研磨対象物2;比重:1.54g/cm3)。続いて、上記[研磨レート(研磨速度)1]において、上記にて準備した研磨対象物2を研磨対象物1の代わりに使用する以外は、上記[研磨レート(研磨速度)1]に記載の方法と同様にして、上記研磨用組成物を用いて、研磨対象物2の研磨レート(研磨速度)を評価した(実施例15、比較例15)。本評価において、研磨レートは高いほど好ましいが、0.50μm/minを超えれば許容でき、0.65μm/min以上であると望ましい。また、表面粗さ(Ra)は小さいほど好ましいが、500nm未満であれば許容でき、200nm未満であると望ましい。
研磨対象物として、ポリフェニレンスルファイド樹脂およびフィラー(球状シリカ、平均粒子径=6.5μm)をフィラー含有量が50質量%になるように混合したものを準備した(研磨対象物3;比重:1.78g/cm3)。続いて、上記[研磨レート(研磨速度)1]において、上記にて準備した研磨対象物3を研磨対象物1の代わりに使用する以外は、上記[研磨レート(研磨速度)1]に記載の方法と同様にして、上記研磨用組成物を用いて、研磨対象物3の研磨レート(研磨速度)を評価した(実施例16、比較例16)。本評価において、研磨レートは高いほど好ましいが、0.10μm/minを超えれば許容でき、0.11μm/min以上であると望ましい。また、表面粗さ(Ra)は小さいほど好ましいが、250nm未満であれば許容でき、200nm未満であると望ましい。
Claims (8)
- アルミナ粒子と、コロイダルシリカ粒子と、分散媒と、を含む、樹脂およびフィラーを含有する研磨対象物の研磨に用いられる研磨用組成物であって、
前記アルミナ粒子の平均粒子径は2.8μm未満であり、
前記コロイダルシリカ粒子の平均粒子径は前記アルミナ粒子の平均粒子径より小さい、研磨用組成物。 - 前記コロイダルシリカ粒子の平均粒子径は0.02μm以上0.20μm未満である、請求項1に記載の研磨用組成物。
- 前記アルミナ粒子の平均粒子径は0.2μm超1.2μm未満である、請求項1または2に記載の研磨用組成物。
- 前記コロイダルシリカ粒子の平均粒子径に対する前記アルミナ粒子の平均粒子径の比が1.5を超え20.0未満である、請求項1~3のいずれか1項に記載の研磨用組成物。
- 前記コロイダルシリカ粒子に対する前記アルミナ粒子の混合質量比が0.3以上5.0未満の割合である、請求項1~4のいずれか1項に記載の研磨用組成物。
- 請求項1~5のいずれか1項に記載の研磨用組成物を用いて、樹脂およびフィラーを含有する研磨対象物を研磨することを有する、研磨方法。
- 前記樹脂が環状の分子構造を有する、請求項6に記載の方法。
- 前記フィラーが球状である、請求項6または7に記載の方法。
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