JP2004331887A - Abrasive composition - Google Patents
Abrasive composition Download PDFInfo
- Publication number
- JP2004331887A JP2004331887A JP2003132313A JP2003132313A JP2004331887A JP 2004331887 A JP2004331887 A JP 2004331887A JP 2003132313 A JP2003132313 A JP 2003132313A JP 2003132313 A JP2003132313 A JP 2003132313A JP 2004331887 A JP2004331887 A JP 2004331887A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- polishing
- component
- polishing composition
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 69
- 150000003839 salts Chemical class 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 9
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 7
- 150000007524 organic acids Chemical class 0.000 claims abstract description 7
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 7
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 6
- 238000005498 polishing Methods 0.000 claims description 154
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 22
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 21
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 12
- QLCAGXDTDCDEGN-UHFFFAOYSA-N 3-sulfanylcarbonylhexanedioic acid Chemical compound OC(=O)CCC(C(O)=S)CC(O)=O QLCAGXDTDCDEGN-UHFFFAOYSA-N 0.000 claims description 9
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 claims description 8
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims description 8
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims description 8
- PVNIIMVLHYAWGP-UHFFFAOYSA-N Niacin Chemical compound OC(=O)C1=CC=CN=C1 PVNIIMVLHYAWGP-UHFFFAOYSA-N 0.000 claims description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 8
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 7
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 7
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 claims description 7
- 239000001630 malic acid Substances 0.000 claims description 7
- 235000011090 malic acid Nutrition 0.000 claims description 7
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 6
- QBYIENPQHBMVBV-HFEGYEGKSA-N (2R)-2-hydroxy-2-phenylacetic acid Chemical compound O[C@@H](C(O)=O)c1ccccc1.O[C@@H](C(O)=O)c1ccccc1 QBYIENPQHBMVBV-HFEGYEGKSA-N 0.000 claims description 4
- JIRHAGAOHOYLNO-UHFFFAOYSA-N (3-cyclopentyloxy-4-methoxyphenyl)methanol Chemical compound COC1=CC=C(CO)C=C1OC1CCCC1 JIRHAGAOHOYLNO-UHFFFAOYSA-N 0.000 claims description 4
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 4
- LBLYYCQCTBFVLH-UHFFFAOYSA-N 2-Methylbenzenesulfonic acid Chemical compound CC1=CC=CC=C1S(O)(=O)=O LBLYYCQCTBFVLH-UHFFFAOYSA-N 0.000 claims description 4
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 4
- 239000004471 Glycine Substances 0.000 claims description 4
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 claims description 4
- IWYDHOAUDWTVEP-UHFFFAOYSA-N R-2-phenyl-2-hydroxyacetic acid Natural products OC(=O)C(O)C1=CC=CC=C1 IWYDHOAUDWTVEP-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 235000004279 alanine Nutrition 0.000 claims description 4
- 229960003767 alanine Drugs 0.000 claims description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 4
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 claims description 4
- 229940092714 benzenesulfonic acid Drugs 0.000 claims description 4
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 claims description 4
- 239000000174 gluconic acid Substances 0.000 claims description 4
- 235000012208 gluconic acid Nutrition 0.000 claims description 4
- 239000004310 lactic acid Substances 0.000 claims description 4
- 235000014655 lactic acid Nutrition 0.000 claims description 4
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 4
- 239000011976 maleic acid Substances 0.000 claims description 4
- 229960002510 mandelic acid Drugs 0.000 claims description 4
- 229940098779 methanesulfonic acid Drugs 0.000 claims description 4
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 4
- 239000011664 nicotinic acid Substances 0.000 claims description 4
- 229960003512 nicotinic acid Drugs 0.000 claims description 4
- 235000001968 nicotinic acid Nutrition 0.000 claims description 4
- KOUKXHPPRFNWPP-UHFFFAOYSA-N pyrazine-2,5-dicarboxylic acid;hydrate Chemical compound O.OC(=O)C1=CN=C(C(O)=O)C=N1 KOUKXHPPRFNWPP-UHFFFAOYSA-N 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 0.000 claims description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 4
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 claims description 4
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 3
- 235000005985 organic acids Nutrition 0.000 claims description 3
- 239000000758 substrate Substances 0.000 abstract description 28
- DTRPBOFZVSROCO-UHFFFAOYSA-N 4-(2-carboxyethoxy)-4-sulfanylidenebutanoic acid Chemical compound OC(=O)CCOC(=S)CCC(O)=O DTRPBOFZVSROCO-UHFFFAOYSA-N 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 12
- 229910018104 Ni-P Inorganic materials 0.000 description 10
- 229910018536 Ni—P Inorganic materials 0.000 description 10
- 230000007547 defect Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- -1 silicon nitrides Chemical class 0.000 description 9
- 239000001384 succinic acid Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 150000002169 ethanolamines Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001737 promoting effect Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 229960000583 acetic acid Drugs 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 229960002449 glycine Drugs 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 3
- RAEOEMDZDMCHJA-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-[2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]ethyl]amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CCN(CC(O)=O)CC(O)=O)CC(O)=O RAEOEMDZDMCHJA-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 229910001593 boehmite Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 229960003330 pentetic acid Drugs 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 159000000001 potassium salts Chemical class 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- UJLCFQIGCBFFEA-UHFFFAOYSA-N 2-aminoethanol 4-(2-carboxyethoxy)-4-sulfanylidenebutanoic acid Chemical compound C(CCC(=O)O)(=S)OCCC(=O)O.C(O)CN UJLCFQIGCBFFEA-UHFFFAOYSA-N 0.000 description 1
- MCXJBRPDXJKRQF-UHFFFAOYSA-N 3-sulfanylcarbonylpentanoic acid Chemical compound CCC(C(S)=O)CC(O)=O MCXJBRPDXJKRQF-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- WEZDCSHDEZUFGX-UHFFFAOYSA-M C(CCC(=O)[O-])(=S)OCCC(=O)O.[K+] Chemical compound C(CCC(=O)[O-])(=S)OCCC(=O)O.[K+] WEZDCSHDEZUFGX-UHFFFAOYSA-M 0.000 description 1
- BRYNTDUXKCVPTQ-UHFFFAOYSA-L C(CCC(=O)[O-])(=S)OCCC(=O)O.[K+].[K+].C(=O)(O)CCOC(CCC(=O)[O-])=S Chemical compound C(CCC(=O)[O-])(=S)OCCC(=O)O.[K+].[K+].C(=O)(O)CCOC(CCC(=O)[O-])=S BRYNTDUXKCVPTQ-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
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- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229920001214 Polysorbate 60 Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 229910021431 alpha silicon carbide Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910001680 bayerite Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
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- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000421 cerium(III) oxide Inorganic materials 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
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- 239000003112 inhibitor Substances 0.000 description 1
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- 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
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- KELHQGOVULCJSG-UHFFFAOYSA-N n,n-dimethyl-1-(5-methylfuran-2-yl)ethane-1,2-diamine Chemical compound CN(C)C(CN)C1=CC=C(C)O1 KELHQGOVULCJSG-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- GQUJEMVIKWQAEH-UHFFFAOYSA-N titanium(III) oxide Chemical compound O=[Ti]O[Ti]=O GQUJEMVIKWQAEH-UHFFFAOYSA-N 0.000 description 1
- SQLNECGQIZLTMW-UHFFFAOYSA-K tripotassium 4-(2-carboxyethoxy)-4-sulfanylidenebutanoate Chemical compound C(CCC(=O)[O-])(=S)OCCC(=O)O.[K+].[K+].[K+].C(=O)(O)CCOC(CCC(=O)[O-])=S.C(=O)(O)CCOC(CCC(=O)[O-])=S SQLNECGQIZLTMW-UHFFFAOYSA-K 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
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
-
- 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
-
- 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
- C09G1/04—Aqueous dispersions
-
- 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
- C09K3/1409—Abrasive particles per se
-
- 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
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、コンピュータの記憶装置として用いられる磁気ディスク用の基板等の被研磨物の表面を研磨するために用いられる研磨用組成物に関するものである。より詳しくは、被研磨面の微小うねりを低減して平滑性を向上させることができる研磨用組成物に関するものである。
【0002】
【従来の技術】
近年、コンピュータの記憶装置として用いられるハードディスクの高密度化等の要求に伴い、研磨後のハードディスク用基板の表面品質の向上が求められている。このような要求を満たすために、従来の研磨用組成物は、酸化アルミニウム等の研磨材、コハク酸又はその塩及び水を含有している(例えば、特許文献1参照。)。そして、研磨材により被研磨物の表面(被研磨面)を研磨し、コハク酸又はその塩が研磨促進剤として作用してより大きな研磨速度が得られるとともに、被研磨面に微小突起等の表面欠陥が発生するのを防止するようになっている。
【0003】
【特許文献1】
特開2000−1665号公報(第2〜4頁)
【0004】
【発明が解決しようとする課題】
ところが、この従来の研磨用組成物においては、コハク酸又はその塩は研磨を促進して被研磨面に表面欠陥が発生するのを防止することはできるが、微小うねりを低減する効果が低く被研磨面の平滑性を十分に向上させることができないという問題があった。
【0005】
本発明は、前記のような従来技術に存在する問題点に着目してなされたものである。その目的とするところは、被研磨面の微小うねりを低減して平滑性を向上させることができる研磨用組成物を提供することにある。
【0006】
【課題を解決するための手段】
前記の目的を達成するために、請求項1に記載の発明の研磨用組成物は、(a)酸化アルミニウム、二酸化ケイ素、酸化セリウム、酸化ジルコニウム、酸化チタン、炭化ケイ素及び窒化ケイ素からなる群から選ばれる少なくとも一種の研磨材、(b)カルボキシエチルチオコハク酸及びその塩からなる群から選ばれる少なくとも一種及び(c)水の各成分を含有するものである。
【0007】
請求項2に記載の発明の研磨用組成物は、請求項1に記載の発明において、さらに(d)成分(b)以外の有機酸、無機酸及びそれらの塩からなる群から選ばれる少なくとも一種の研磨促進剤を含有するものである。
【0008】
請求項3に記載の発明の研磨用組成物は、請求項2に記載の発明において、成分(d)が、リンゴ酸、グリコール酸、コハク酸、クエン酸、マレイン酸、イタコン酸、マロン酸、イミノ二酢酸、グルコン酸、乳酸、マンデル酸、酒石酸、クロトン酸、ニコチン酸、酢酸、グリシン、アラニン、メタンスルホン酸、ベンゼンスルホン酸、トルエンスルホン酸、キシレンスルホン酸、チオ酢酸、メルカプトコハク酸、硝酸アルミニウム及び硫酸アルミニウムからなる群から選ばれる少なくとも一種である。
【0009】
【発明の実施の形態】
以下、本発明を具体化した実施形態を詳細に説明する。
本実施形態の研磨用組成物には、(a)酸化アルミニウム、二酸化ケイ素、酸化セリウム、酸化ジルコニウム、酸化チタン、炭化ケイ素及び窒化ケイ素からなる群から選ばれる少なくとも一種の研磨材、(b)カルボキシエチルチオコハク酸及びその塩からなる群から選ばれる少なくとも一種及び(c)水の各成分が含有されている。
【0010】
この研磨用組成物は、磁気ディスク用基板等の被研磨物の表面を研磨(一次研磨等)するために用いられる。被研磨物の具体例としては、ブランク材のアルミニウム合金表面にニッケル(Ni)−リン(P)の無電解メッキが施されたNi−Pサブストレートや、Ni−鉄(Fe)サブストレート、ボロンカーバイド(BC)サブストレート、カーボン(C)サブストレート等が挙げられる。
【0011】
成分(a)の酸化アルミニウム、二酸化ケイ素、酸化セリウム、酸化ジルコニウム、酸化チタン、炭化ケイ素及び窒化ケイ素からなる群から選ばれる少なくとも一種の研磨材は、その機械的研磨作用により被研磨面を研磨する。これらの中でも、酸化アルミニウム又は二酸化ケイ素が微小うねりを低減する効果が高いために好ましく、酸化アルミニウムが前記効果に加えてより大きな研磨速度を得ることができるためにより好ましい。
【0012】
酸化アルミニウムの具体例としては、α−アルミナ、δ−アルミナ、θ−アルミナ、κ−アルミナ等の結晶形態が異なるものや、フュームドアルミナ等の製造方法が異なる種々のものが挙げられる。二酸化ケイ素の具体例としては、コロイダルシリカ、フュームドシリカ等の製造方法や性状の異なる種々のものが挙げられる。酸化セリウムの具体例としては、二酸化セリウム、三酸化二セリウム等や、六方晶系、等軸晶系、面心立方晶系等の結晶系が異なる種々のものが挙げられる。
【0013】
酸化ジルコニウムの具体例としては、単斜晶系、正方晶系等の結晶系が異なるものや非晶質なもの、フュームドジルコニア等の製造方法が異なる種々のものが挙げられる。酸化チタンの具体例としては、一酸化チタン、三酸化二チタン、二酸化チタン等や、フュームドチタニア等の製造方法が異なる種々のものが挙げられる。炭化ケイ素の具体例としては、α−炭化ケイ素、β−炭化ケイ素、アモルファス炭化ケイ素等の結晶形態が異なる種々のものが挙げられる。窒化ケイ素の具体例としては、α−窒化ケイ素、β−窒化ケイ素、アモルファス窒化ケイ素等の結晶形態が異なる種々のものが挙げられる。
【0014】
成分(a)の粒子径は、成分(a)が酸化アルミニウム、酸化ジルコニウム、酸化チタン、炭化ケイ素又は窒化ケイ素のときには、レーザー回折散乱式粒度測定機(LS−230;Coulter社製)を用いた測定等のレーザー回折散乱法により求められる平均粒子径で好ましくは0.05〜2μm、より好ましくは0.1〜1.5μmである。成分(a)が二酸化ケイ素のときには、気体吸着による粉体の比表面積測定法(BET法)により測定された比表面積から求められる平均粒子径で好ましくは0.005〜0.5μm、より好ましくは0.01〜0.3μmである。
【0015】
一方、成分(a)が酸化セリウムのときには、走査型電子顕微鏡(SEM)により観察される平均粒子径で好ましくは0.01〜0.5μm、より好ましくは0.05〜0.45μmである。成分(a)の粒子径が前記範囲未満では機械的研磨作用が低く十分な研磨速度が得られないおそれがある。一方、前記範囲を超えると、研磨用組成物中で成分(a)の沈殿が発生しやすくなるとともに、被研磨面にスクラッチが発生するおそれがある。ここで、スクラッチとは、一定の幅及び深さを超える引掻き傷のことである。
【0016】
研磨用組成物中の成分(a)の含有量は、好ましくは0.1〜40重量%、より好ましくは1〜25重量%である。成分(a)の含有量が0.1重量%未満では機械的研磨作用が低く十分な研磨速度が得られないおそれがある。一方、40重量%を超えると、成分(a)同士が凝集することにより研磨用組成物の安定性が低下して研磨用組成物に沈殿が発生しやすくなるとともに、研磨用組成物の粘性が高くなるおそれがある。
【0017】
成分(b)のカルボキシエチルチオコハク酸及びその塩からなる群から選ばれる少なくとも一種は、その化学的研磨作用によって被研磨面を研磨して研磨を促進するとともに、被研磨面の微小うねりを低減する。これは、成分(b)が、その化学的研磨作用によって被研磨面の微小うねりを除去するためと推察される。ここで、微小うねりとは、表面粗さ測定機を用いて一定の測定波長で測定された微小な凹凸を高さ(Å)で表したものである。研磨用組成物には研磨促進効果を有するものとして成分(b)以外にも公知の各種研磨促進剤が一般的に用いられるが、その種類及び量によっては被研磨面の微小うねりが悪化(増大)するおそれがある。従って、研磨用組成物は成分(b)を含有する必要がある。
【0018】
カルボキシルエチルチオコハク酸は下記式(1)で示され、塩の具体例としてはカリウム塩等のアルカリ金属塩、アンモニウム塩、モノエタノールアミン塩等のアミン塩等が挙げられる。これらの中でも、カルボキシエチルチオコハク酸、又はそのカリウム塩やモノエタノールアミン塩が、化学的研磨作用によって被研磨面の微小うねりを除去する作用が強く微小うねりを低減する効果が高いために好ましい。
【0019】
【化1】
研磨用組成物中の成分(b)の含有量は、好ましくは0.001〜10重量%、より好ましくは0.003〜5重量%、最も好ましくは0.01〜2重量%である。成分(b)の含有量が0.001重量%未満では、成分(b)による被研磨面の微小うねりの除去の程度が低く微小うねりを十分に低減することができないとともに、十分な研磨速度が得られないおそれがある。一方、10重量%を超えると、被研磨面に微小突起や微細なピット(凹み)等の表面欠陥が発生するおそれがある。
【0020】
成分(c)の水は、他の成分を溶解又は分散させる。成分(c)は他の成分の作用を阻害するのを防止するために不純物をできるだけ含有しないものが好ましく、具体的にはイオン交換樹脂にて不純物イオンを除去した後にフィルタを通して異物を除去した純水や超純水、又は蒸留水等が好ましい。研磨用組成物中の成分(c)の含有量は、研磨用組成物中の他の成分の含有量に対する残量である。
【0021】
研磨用組成物には、前記各成分以外に(d)成分(b)以外の有機酸、無機酸及びそれらの塩からなる群から選ばれる少なくとも一種の研磨促進剤を含有させるのが好ましい。
【0022】
成分(d)は、成分(b)と同様にその化学的研磨作用によって被研磨面を研磨し、研磨を促進する。成分(d)を構成する群の中でも、有機酸及び無機塩からなる群から選ばれる少なくとも一種が、化学的研磨作用が強く研磨促進効果が高いために好ましい。さらに、成分(d)は、研磨促進効果がより高いために、リンゴ酸、グリコール酸、コハク酸、クエン酸、マレイン酸、イタコン酸、マロン酸、イミノ二酢酸、グルコン酸、乳酸、マンデル酸、酒石酸、クロトン酸、ニコチン酸、酢酸、グリシン、アラニン、メタンスルホン酸、ベンゼンスルホン酸、トルエンスルホン酸、キシレンスルホン酸、チオ酢酸、メルカプトコハク酸、硝酸アルミニウム及び硫酸アルミニウムからなる群から選ばれる少なくとも一種がより好ましく、リンゴ酸、グリコール酸、コハク酸、クエン酸又はイミノ二酢酸が最も好ましい。
【0023】
研磨用組成物中の成分(d)の含有量は、好ましくは0.001〜0.5重量%、より好ましくは0.005〜0.3重量%である。成分(d)の含有量が0.001重量%未満では、成分(d)による十分な研磨促進効果を得ることができない。一方、0.5重量%を超えると、成分(d)によって被研磨面が浸食されることにより、被研磨面の微小うねりが悪化したり微細なピット等の表面欠陥が発生するおそれがある。
【0024】
研磨用組成物には、研磨用組成物の安定化や研磨加工上の必要性等に応じ、成分(d)以外のその他の添加成分として、(e)界面活性剤、(f)アルミナゾル、モリブデン酸やそのナトリウム塩、カリウム塩、アンモニウム塩等の塩、アルギン酸ナトリウムや炭酸水素カリウム等の殺菌剤、ニトリロ三酢酸(NTA)、エチレンジアミン四酢酸(EDTA)、ジエチレントリアミン五酢酸(DTPA)、トリエチレンテトラミン六酢酸(TTHA)等のキレート剤、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース、カルボキシメチルセルロース等の水溶性セルロース類、高級脂肪酸アミン、スルホン酸、防錆剤、消泡剤等の加工油類等を含有させてもよい。研磨用組成物中のその他の添加成分の含有量は、研磨用組成物の常法に従って決定される。
【0025】
成分(e)の界面活性剤は一般的に研磨用組成物の分散性の向上や被研磨面の表面欠陥の発生の抑制等の効果を有し、ノニオン系界面活性剤やアニオン系界面活性剤等が挙げられる。これらの中でも、例えば被研磨面としての磁気ディスク用基板の表面を研磨するときに、磁気ディスク用基板表面の外周縁における面ダレを改善して磁気ディスク用基板表面の平坦性を向上させる効果が高いために、ノニオン系界面活性剤においては下記一般式(2)で示されるポリオキシエチレンポリオキシプロピレンアルキルエーテル、下記一般式(3)又は下記一般式(4)で示される構造を持つポリオキシエチレンポリオキシプロピレンコポリマー、ポリオキシエチレンソルビタン脂肪酸エステル、ポリオキシエチレンソルビット脂肪酸エステル、下記一般式(5)で示されるウレタン会合型界面活性剤が好ましい。
【0026】
【化2】
(式中のRはアルキル基を示し、l及びmは整数を示す。)
【0027】
【化3】
(式中のn、o及びpは整数を示す。)
【0028】
【化4】
(式中のq、r及びsは整数を示す。)
【0029】
【化5】
(式中のXは活性水素原子を有する化合物とアルキレンオキシドから誘導されたポリエーテルポリオールの残基(但し、ポリエーテル鎖中にオキシエチレン基を20〜90重量%含む。)、tは2〜8の整数(=前記ポリエーテルポリオール1分子中の水酸基の数)、Yは二価の炭化水素基、Zは活性水素原子を有する一価の化合物の残基、uは3以上の整数を示す。)
一方、アニオン系界面活性剤においては、ポリアクリル酸ナトリウム等のポリカルボン酸塩、イソプレンスルホン酸とアクリル酸との共重合体等のイソプレンスルホン酸又はその塩を必須単量体として得られる重合体等が好ましい。
【0030】
研磨用組成物中の成分(e)の含有量は、好ましくは0.001〜0.5重量%、より好ましくは0.005〜0.3重量%である。界面活性剤の含有量が0.001重量%未満では面ダレを十分に抑制することができない。一方、0.5重量%を超えると、研磨促進効果を妨げて大きな研磨速度が得られず、研磨用組成物中に析出物が析出するとともに発泡するおそれがある。
【0031】
成分(f)のアルミナゾルは、被研磨面に微小突起、微細なピット等の表面欠陥の発生を抑制する。これは、アルミナゾルが成分(a)の研磨材粒子表面に付着し、成分(a)の機械的研磨作用を促進するためと推察される。さらに、アルミナゾルが研磨用組成物中にコロイド状に分散することにより、成分(a)の分散性を向上させて成分(a)が沈殿するのを防止し、被研磨物を研磨するときに研磨パッドに成分(a)を保持しやすくする。
【0032】
成分(f)の具体例としてはアルミナ水和物及び水酸化アルミニウムから選ばれる少なくとも一種を酸性水溶液中にコロイド状に分散させたものが挙げられ、アルミナ水和物としてはベーマイト、擬ベーマイト、ダイアスポア、ジブサイト、バイヤライト等が挙げられる。ここで、酸性水溶液は有機酸、無機酸及びそれらの塩により水のpHを酸性側に調整することにより調製される。アルミナ水和物は単独で含有されてもよいし、二種以上を組み合わせて含有されてもよい。これらの中でも、ベーマイト又は擬ベーマイトを酸性水溶液中に分散させたものが、表面欠陥の発生を抑制する効果が高いとともに被研磨面の表面粗さを低減する効果を有するために好ましい。本実施形態の研磨用組成物を調製するときにおける各成分の混合順序は限定されず、いずれの順序でもよいし同時でもよい。
【0033】
次に、本実施形態の研磨用組成物を用いた研磨方法について説明する。
被研磨面として磁気ディスク用基板表面を研磨するときには、磁気ディスク用基板表面の研磨工程における磁気ディスク用基板の表面品質をより効率的に向上させるため、一般的には研磨工程は二段階に分けて行なわれる。即ち、1段目の研磨工程においては、磁気ディスク用基板表面のうねり、2段目の仕上げ研磨工程では除去できないような磁気ディスク用基板表面の大きなスクラッチや凹凸等の表面欠陥を除去する目的で研磨工程が行なわれる。
【0034】
一方、2段目の研磨工程においては、所望の小さな表面粗さに調整し、かつ1段目の研磨工程で発生した表面欠陥や1段目の研磨工程で完全に除去できなかったような表面欠陥を除去する目的で、仕上げ研磨工程が行なわれる。また、場合によっては、研磨工程を3段以上の工程に細分化して行なわれることもある。本実施形態の研磨用組成物は、これらの研磨工程のいずれにも用いることができるが、磁気ディスク用基板表面の微小うねりを低減することができるために、1段目の研磨工程で用いられるのが好ましい。
【0035】
さて、本実施形態の研磨用組成物を用いて例えばNi−Pサブストレート表面の1段目の研磨(一次研磨)を行なうときには、研磨用組成物をNi−Pサブストレート表面に供給しながら研磨パッドでNi−Pサブストレート表面を研磨する。このとき、研磨用組成物には成分(a)が含有されているために、その機械的研磨作用によって一定の研磨速度でNi−Pサブストレート表面を研磨することができる。さらに、研磨用組成物には成分(b)が含有されているために、その化学的研磨作用によって研磨を促進して大きな研磨速度が得られるとともに、被研磨面の微小うねりを低減して平滑性を向上させることができる。加えて、成分(d)を含有することにより、より大きな研磨速度を得ることができる。
【0036】
以上詳述した本実施形態によれば、次のような効果が発揮される。
・ 本実施形態の研磨用組成物は成分(b)を含有している。成分(b)はコハク酸又はその塩と同様に研磨促進効果を有するとともに、コハク酸又はその塩に比べて微小うねりを除去する効果が高いと推察される。このため、本実施形態の研磨用組成物は、コハク酸又はその塩を含有する従来の研磨用組成物に比べて、被研磨面の微小うねりを低減して平滑性を向上させることができる。
【0037】
・ 研磨用組成物は成分(d)を含有するのが好ましい。この場合には、成分(d)の化学的研磨作用によって大きな研磨速度を得ることができる。
・ 成分(d)はリンゴ酸、グリコール酸、コハク酸、クエン酸、マレイン酸、イタコン酸、マロン酸、イミノ二酢酸、グルコン酸、乳酸、マンデル酸、酒石酸、クロトン酸、ニコチン酸、酢酸、グリシン、アラニン、メタンスルホン酸、ベンゼンスルホン酸、トルエンスルホン酸、キシレンスルホン酸、チオ酢酸、メルカプトコハク酸、硝酸アルミニウム及び硫酸アルミニウムからなる群から選ばれる少なくとも一種が好ましく、リンゴ酸、グリコール酸、コハク酸、クエン酸及びイミノ二酢酸からなる群から選ばれる少なくとも一種がより好ましい。この場合には、より大きな研磨速度を得ることができる。
【0038】
・ 成分(a)は酸化アルミニウムが好ましい。この場合には、被研磨面の平滑性をより向上させることができるとともに、さらに大きな研磨速度を得ることができる。
【0039】
・ 成分(b)はカルボキシエチルチオコハク酸、又はそのカリウム塩やモノエタノールアミン塩が好ましい。この場合には、被研磨面の平滑性をより向上させることができる。
【0040】
なお、前記実施形態を次のように変更して構成することもできる。
・ 研磨用組成物を、調製するときには成分(c)の含有量が研磨工程に用いられるときに比べて少なく設定されることにより成分(c)以外の各成分が濃縮され、研磨工程に用いられるときには成分(c)が加えられて希釈されるように構成してもよい。このように構成した場合は、研磨用組成物の管理を容易に行なうとともに輸送効率を向上させることができる。
【0041】
・ 被研磨面の研磨を1段で行なってもよいし、本実施形態の研磨用組成物を仕上げ研磨に用いてもよい。
・ 被研磨物としては、磁気ディスク以外にも半導体ウエハ等の半導体基板、光学レンズ等が挙げられる。これらの材質としては、タングステン、銅、シリコン、ガラス、セラミック等が挙げられる。
【0042】
【実施例】
次に、実施例及び比較例を挙げて前記実施形態をさらに具体的に説明する。
(実施例1〜16及び比較例1〜8)
実施例1においては、まず成分(a)としての酸化アルミニウム、成分(b)としてのカルボキシエチレルチオコハク酸及び成分(c)の水を混合して研磨用組成物を調製した。ここで、酸化アルミニウムの粒子径は、レーザー回折散乱式粒度測定機(LS−230;Coulter社製)により測定された平均粒子径で0.8μmであり、研磨用組成物中の含有量は6重量%であった。成分(b)の含有量を表1に示す。
【0043】
実施例2〜8においては、成分(b)の種類及び含有量を表1に示すように変更した以外は、実施例1と同様にして研磨用組成物を調製した。実施例9〜16及び比較例1〜8においては、成分(b)の種類及び含有量を表1に示すように変更するとともに、成分(d)として表1に示す化合物を混合した以外は、実施例1と同様にして研磨用組成物を調製した。そして、各例の研磨用組成物について、下記(1)及び(2)の項目に関し評価を行なった。それらの結果を表1に示す。尚、表1において、カルボキシエチルチオコハク酸をA1で示すとともに、カルボキシエチルチオコハク酸一カリウムをA2で示し、カルボキシエチルチオコハク酸二カリウムをA3で示すとともにカルボキシエチルチオコハク酸三カリウムをA4で示す。さらに、モノエタノールアミン・カルボキシエチルチオコハク酸塩をA5で示し、各成分の含有量を重量%で示す。
【0044】
(1)微小うねり
各例の研磨用組成物を用い、下記の研磨条件で被研磨物(無電解Ni−Pサブストレート)の表面を研磨した。次いで、非接触式表面粗さ測定器(Micro XAM;PhaseShift社製;対物レンズ:×10倍、フィルター:Gaussian Bandpass 80〜450μmで測定されたRa値)を用い、研磨加工後の無電解Ni−Pサブストレート表面の微小うねりの大きさを測定した。そして、微小うねりについて、Raが4.5Å未満(◎)、Raが4.5Å以上5.0Å未満(○)、Raが5.0Å以上(△)の3段階で評価した。
<研磨条件>
被研磨物:直径3.5インチ(≒95mm)の無電解Ni−Pサブストレート、研磨機:両面研磨機(定盤直径720mm)、研磨パッド:ポリウレタンパッド(BELLATRIX N0048;カネボウ株式会社製)、荷重:100g/cm2(≒10kPa)、上定盤回転数:24rpm、下定盤回転数:16rpm、研磨用組成物の供給量:150ml/分、研磨量:両面の取り代にして3μm
(2)研磨速度
各例の研磨用組成物を用い、前記の研磨条件で被研磨物(無電解Ni−Pサブストレート)の表面を研磨した後、下記に示す計算式に基づいて研磨速度を求めた。そして、研磨速度について、研磨速度が0.50μm/分以上(◎)、研磨速度が0.45μm/分以上0.50μm/分未満(○)、研磨速度が0.45μm/分未満(△)の3段階で評価した。
<研磨速度の計算式>
研磨速度[μm/分]=研磨による無電解Ni−Pサブストレートの重量減[g]÷(被研磨面の面積[cm2]×Ni−Pメッキの密度[g/cm3]×研磨時間[分])×10000
【0045】
【表1】
表1に示すように、実施例1〜16においては、微小うねり及び研磨速度について優れた評価となった。さらに、実施例9〜16においては、成分(d)を含有するために、研磨速度についてさらに優れた結果となった。このため、実施例1〜16の研磨用組成物を用いると微小うねりを低減して平滑性を向上させることができ、実施例9〜16の研磨用組成物を用いるとより大きな研磨速度を得ることができた。一方、比較例1〜8においては、成分(b)を含有しないために、各実施例に比べて微小うねりについて劣る評価となった。
【0046】
次に、前記実施形態から把握できる技術的思想について以下に記載する。
(1)前記成分(a)は酸化アルミニウムである請求項1から3のいずれか一項に記載の研磨用組成物。この構成によれば、被研磨面の微小うねりをより低減することにより平滑性をより向上させることができるとともに、より大きな研磨速度を得ることができる。
【0047】
(2)前記成分(b)はカルボキシエチルチオコハク酸並びにそのカリウム塩及びモノエタノールアミン塩からなる群から選ばれる少なくとも一種である請求項1から3及び上記(1)のいずれか一項に記載の研磨用組成物。この構成によれば、被研磨面の微小うねりをより低減することにより平滑性をより向上させることができる。
【0048】
(3)前記成分(d)はリンゴ酸、グリコール酸、コハク酸、クエン酸及びイミノ二酢酸からなる群から選ばれる少なくとも一種である請求項2、請求項3、上記(1)及び上記(2)のいずれか一項に記載の研磨用組成物。この構成によれば、より大きな研磨速度を得ることができる。
【0049】
【発明の効果】
本発明は、以上のように構成されているため、次のような効果を奏する。
請求項1に記載の発明の研磨用組成物によれば、被研磨面の微小うねりを低減して平滑性を向上させることができる。
【0050】
請求項2及び3に記載の発明の研磨用組成物によれば、請求項1に記載の発明の効果に加え、より大きな研磨速度を得ることができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a polishing composition used for polishing a surface of an object to be polished such as a substrate for a magnetic disk used as a storage device of a computer. More specifically, the present invention relates to a polishing composition capable of reducing fine waviness on a surface to be polished and improving smoothness.
[0002]
[Prior art]
2. Description of the Related Art In recent years, with the demand for higher density of a hard disk used as a storage device of a computer, an improvement in the surface quality of a polished hard disk substrate has been demanded. In order to satisfy such requirements, the conventional polishing composition contains an abrasive such as aluminum oxide, succinic acid or a salt thereof, and water (for example, see Patent Document 1). Then, the surface of the object to be polished (the surface to be polished) is polished with an abrasive, and succinic acid or a salt thereof acts as a polishing accelerator to obtain a higher polishing rate. It is designed to prevent defects from occurring.
[0003]
[Patent Document 1]
JP-A-2000-1665 (pages 2 to 4)
[0004]
[Problems to be solved by the invention]
However, in this conventional polishing composition, succinic acid or a salt thereof can promote polishing and prevent the occurrence of surface defects on the surface to be polished, but the effect of reducing minute waviness is low and the succinic acid or salt thereof has a low effect. There is a problem that the smoothness of the polished surface cannot be sufficiently improved.
[0005]
The present invention has been made by focusing on the problems existing in the prior art as described above. An object of the present invention is to provide a polishing composition capable of reducing fine waviness on a surface to be polished and improving smoothness.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the polishing composition according to the first aspect of the present invention includes: (a) a polishing composition selected from the group consisting of (a) aluminum oxide, silicon dioxide, cerium oxide, zirconium oxide, titanium oxide, silicon carbide, and silicon nitride. It contains at least one selected abrasive, at least one selected from the group consisting of (b) carboxyethylthiosuccinic acid and salts thereof, and (c) each component of water.
[0007]
The polishing composition according to the second aspect of the present invention is the polishing composition according to the first aspect, further comprising at least one selected from the group consisting of an organic acid, an inorganic acid, and a salt thereof other than the component (d). Containing a polishing accelerator.
[0008]
The polishing composition according to the third aspect of the present invention is the polishing composition according to the second aspect, wherein the component (d) is malic acid, glycolic acid, succinic acid, citric acid, maleic acid, itaconic acid, malonic acid, Iminodiacetic acid, gluconic acid, lactic acid, mandelic acid, tartaric acid, crotonic acid, nicotinic acid, acetic acid, glycine, alanine, methanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, xylenesulfonic acid, thioacetic acid, mercaptosuccinic acid, nitric acid It is at least one selected from the group consisting of aluminum and aluminum sulfate.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments embodying the present invention will be described in detail.
The polishing composition of the present embodiment includes (a) at least one abrasive selected from the group consisting of aluminum oxide, silicon dioxide, cerium oxide, zirconium oxide, titanium oxide, silicon carbide, and silicon nitride; It contains at least one selected from the group consisting of ethylthiosuccinic acid and salts thereof and (c) each component of water.
[0010]
This polishing composition is used to polish (primary polishing, etc.) the surface of a polishing object such as a magnetic disk substrate. Specific examples of the object to be polished include a Ni-P substrate in which nickel (Ni) -phosphorus (P) is electrolessly plated on an aluminum alloy surface of a blank material, a Ni-iron (Fe) substrate, and boron. Carbide (BC) substrates, carbon (C) substrates, and the like.
[0011]
At least one abrasive selected from the group consisting of aluminum oxide, silicon dioxide, cerium oxide, zirconium oxide, titanium oxide, silicon carbide and silicon nitride as the component (a) polishes the surface to be polished by its mechanical polishing action. . Among these, aluminum oxide or silicon dioxide is preferable because of its high effect of reducing minute waviness, and aluminum oxide is more preferable because it is possible to obtain a higher polishing rate in addition to the above effects.
[0012]
Specific examples of aluminum oxide include those having different crystal forms such as α-alumina, δ-alumina, θ-alumina, and κ-alumina, and various materials having different production methods such as fumed alumina. Specific examples of silicon dioxide include various production methods and properties of colloidal silica, fumed silica, and the like. Specific examples of cerium oxide include cerium dioxide, cerium trioxide, and the like, and various types having different crystal systems such as a hexagonal system, an equiaxed system, and a face-centered cubic system.
[0013]
Specific examples of zirconium oxide include those having different crystal systems such as monoclinic system and tetragonal system, those having an amorphous structure, and those having different production methods such as fumed zirconia. Specific examples of titanium oxide include titanium monoxide, dititanium trioxide, titanium dioxide and the like, and various types of fumed titania and the like having different production methods. Specific examples of silicon carbide include α-silicon carbide, β-silicon carbide, amorphous silicon carbide, and various other types having different crystal forms. Specific examples of silicon nitride include various silicon nitrides having different crystal forms, such as α-silicon nitride, β-silicon nitride, and amorphous silicon nitride.
[0014]
When the component (a) was aluminum oxide, zirconium oxide, titanium oxide, silicon carbide or silicon nitride, the particle diameter of the component (a) was measured using a laser diffraction / scattering particle size analyzer (LS-230; manufactured by Coulter). The average particle size determined by a laser diffraction scattering method such as measurement is preferably 0.05 to 2 μm, more preferably 0.1 to 1.5 μm. When the component (a) is silicon dioxide, the average particle diameter obtained from the specific surface area measured by the specific surface area measurement method (BET method) by gas adsorption is preferably 0.005 to 0.5 μm, more preferably It is 0.01 to 0.3 μm.
[0015]
On the other hand, when the component (a) is cerium oxide, the average particle diameter observed by a scanning electron microscope (SEM) is preferably 0.01 to 0.5 μm, more preferably 0.05 to 0.45 μm. If the particle diameter of the component (a) is less than the above range, the mechanical polishing action is so low that a sufficient polishing rate may not be obtained. On the other hand, if it exceeds the above range, precipitation of the component (a) is likely to occur in the polishing composition, and scratches may be generated on the surface to be polished. Here, the scratch is a scratch exceeding a certain width and depth.
[0016]
The content of the component (a) in the polishing composition is preferably 0.1 to 40% by weight, and more preferably 1 to 25% by weight. If the content of the component (a) is less than 0.1% by weight, the mechanical polishing action is so low that a sufficient polishing rate may not be obtained. On the other hand, when the content exceeds 40% by weight, the stability of the polishing composition is reduced due to aggregation of the components (a), and the polishing composition is likely to precipitate, and the viscosity of the polishing composition is reduced. May be high.
[0017]
At least one component (b) selected from the group consisting of carboxyethylthiosuccinic acid and a salt thereof is polished on the surface to be polished by its chemical polishing action to promote polishing, and reduces minute waviness on the surface to be polished. I do. This is presumed to be because the component (b) removes minute waviness on the surface to be polished by its chemical polishing action. Here, the minute waviness is the height (Å) of minute unevenness measured at a constant measurement wavelength using a surface roughness measuring device. In the polishing composition, various known polishing accelerators other than the component (b) are generally used as those having a polishing acceleration effect. However, depending on the type and amount thereof, fine waviness of the polished surface is deteriorated (increased). ). Therefore, the polishing composition needs to contain the component (b).
[0018]
Carboxylethylthiosuccinic acid is represented by the following formula (1), and specific examples of the salt include an alkali metal salt such as a potassium salt, an ammonium salt, and an amine salt such as a monoethanolamine salt. Among them, carboxyethylthiosuccinic acid, or a potassium salt or a monoethanolamine salt thereof is preferable because the effect of removing fine waviness on the surface to be polished by chemical polishing is strong and the effect of reducing fine waviness is high.
[0019]
Embedded image
The content of the component (b) in the polishing composition is preferably 0.001 to 10% by weight, more preferably 0.003 to 5% by weight, and most preferably 0.01 to 2% by weight. When the content of the component (b) is less than 0.001% by weight, the degree of removal of the minute undulation on the surface to be polished by the component (b) is low, and the minute undulation cannot be sufficiently reduced, and the sufficient polishing rate is not obtained. May not be obtained. On the other hand, if it exceeds 10% by weight, surface defects such as minute projections and fine pits (dents) may be generated on the surface to be polished.
[0020]
The water of component (c) dissolves or disperses other components. The component (c) preferably does not contain impurities as much as possible in order to prevent the action of the other components from being hindered. More specifically, pure water obtained by removing impurity ions with an ion exchange resin and then removing foreign matter through a filter is preferred. Water, ultrapure water, or distilled water is preferred. The content of the component (c) in the polishing composition is the remaining amount relative to the content of other components in the polishing composition.
[0021]
The polishing composition preferably contains, in addition to the above components, at least one polishing accelerator selected from the group consisting of organic acids, inorganic acids, and salts thereof other than component (b).
[0022]
The component (d) polishes the surface to be polished by the chemical polishing action like the component (b), and promotes the polishing. Among the groups constituting the component (d), at least one selected from the group consisting of organic acids and inorganic salts is preferable because of its strong chemical polishing action and high polishing promoting effect. Further, component (d) has a higher polishing promoting effect, so that malic acid, glycolic acid, succinic acid, citric acid, maleic acid, itaconic acid, malonic acid, iminodiacetic acid, gluconic acid, lactic acid, mandelic acid, At least one selected from the group consisting of tartaric acid, crotonic acid, nicotinic acid, acetic acid, glycine, alanine, methanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, xylenesulfonic acid, thioacetic acid, mercaptosuccinic acid, aluminum nitrate and aluminum sulfate Is more preferable, and malic acid, glycolic acid, succinic acid, citric acid or iminodiacetic acid is most preferable.
[0023]
The content of the component (d) in the polishing composition is preferably 0.001 to 0.5% by weight, more preferably 0.005 to 0.3% by weight. If the content of the component (d) is less than 0.001% by weight, a sufficient polishing promoting effect by the component (d) cannot be obtained. On the other hand, when the content exceeds 0.5% by weight, the surface to be polished is eroded by the component (d), which may cause minute undulations on the surface to be polished or surface defects such as fine pits.
[0024]
The polishing composition may further contain (e) a surfactant, (f) alumina sol, molybdenum, etc., in addition to the component (d), in accordance with the stabilization of the polishing composition and necessity for polishing. Acids and salts thereof, such as sodium salts, potassium salts, ammonium salts, etc., fungicides such as sodium alginate and potassium hydrogen carbonate, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), triethylenetetramine A chelating agent such as hexaacetic acid (TTHA), water-soluble celluloses such as hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, etc., and processing oils such as higher fatty acid amines, sulfonic acids, rust inhibitors, defoamers, etc. Is also good. The content of other additional components in the polishing composition is determined according to a conventional method for the polishing composition.
[0025]
The surfactant of component (e) generally has an effect of improving the dispersibility of the polishing composition and suppressing the occurrence of surface defects on the surface to be polished, and is a nonionic surfactant or an anionic surfactant. And the like. Among these, for example, when polishing the surface of the magnetic disk substrate as the surface to be polished, the effect of improving the surface sagging at the outer peripheral edge of the magnetic disk substrate surface and improving the flatness of the magnetic disk substrate surface is improved. Due to its high cost, nonionic surfactants include polyoxyethylene polyoxypropylene alkyl ether represented by the following general formula (2) and polyoxyethylene having a structure represented by the following general formula (3) or (4): Preferred are an ethylene polyoxypropylene copolymer, a polyoxyethylene sorbitan fatty acid ester, a polyoxyethylene sorbite fatty acid ester, and a urethane-associated surfactant represented by the following general formula (5).
[0026]
Embedded image
(R in the formula represents an alkyl group, and l and m represent integers.)
[0027]
Embedded image
(In the formula, n, o, and p represent integers.)
[0028]
Embedded image
(In the formula, q, r and s represent integers.)
[0029]
Embedded image
(X in the formula is a residue of a polyether polyol derived from a compound having an active hydrogen atom and an alkylene oxide (provided that the polyether chain contains 20 to 90% by weight of oxyethylene groups), and t is 2 to 2. An integer of 8 (= the number of hydroxyl groups in one molecule of the polyether polyol), Y is a divalent hydrocarbon group, Z is a residue of a monovalent compound having an active hydrogen atom, and u is an integer of 3 or more .)
On the other hand, in the case of anionic surfactants, polycarboxylates such as sodium polyacrylate, isoprenesulfonic acid such as a copolymer of isoprenesulfonic acid and acrylic acid or a polymer obtained by using the salt thereof as an essential monomer Are preferred.
[0030]
The content of the component (e) in the polishing composition is preferably 0.001 to 0.5% by weight, more preferably 0.005 to 0.3% by weight. If the content of the surfactant is less than 0.001% by weight, surface sagging cannot be sufficiently suppressed. On the other hand, if the content exceeds 0.5% by weight, a high polishing rate cannot be obtained because the polishing promotion effect is hindered, and precipitates may precipitate in the polishing composition and foam.
[0031]
The alumina sol of the component (f) suppresses the occurrence of surface defects such as minute projections and minute pits on the surface to be polished. This is presumably because the alumina sol adheres to the surface of the abrasive particles of the component (a) to promote the mechanical polishing action of the component (a). Furthermore, by dispersing the alumina sol in a colloidal form in the polishing composition, the dispersibility of the component (a) is improved, the component (a) is prevented from settling, and polishing is performed when polishing the object to be polished. The component (a) is easily retained on the pad.
[0032]
Specific examples of the component (f) include those obtained by dispersing at least one selected from alumina hydrate and aluminum hydroxide in an acidic aqueous solution in a colloidal form. Examples of the alumina hydrate include boehmite, pseudo-boehmite, and diaspore. , Gibbsite, bayerite and the like. Here, the acidic aqueous solution is prepared by adjusting the pH of water to an acidic side with an organic acid, an inorganic acid, or a salt thereof. Alumina hydrate may be contained alone or in combination of two or more. Among them, those in which boehmite or pseudo-boehmite is dispersed in an acidic aqueous solution are preferable because they have a high effect of suppressing the occurrence of surface defects and an effect of reducing the surface roughness of the polished surface. The order of mixing the components when preparing the polishing composition of the present embodiment is not limited, and may be any order or may be simultaneous.
[0033]
Next, a polishing method using the polishing composition of the present embodiment will be described.
When polishing the surface of a magnetic disk substrate as a surface to be polished, the polishing process is generally divided into two steps in order to more efficiently improve the surface quality of the magnetic disk substrate in the polishing process of the magnetic disk substrate surface. It is done. That is, in the first polishing step, the surface of the magnetic disk substrate surface is undulated for the purpose of removing surface defects such as large scratches and irregularities on the magnetic disk substrate surface which cannot be removed in the second polishing step. A polishing step is performed.
[0034]
On the other hand, in the second polishing step, the surface is adjusted to a desired small surface roughness, and a surface defect generated in the first polishing step or a surface which cannot be completely removed in the first polishing step. A finish polishing step is performed to remove defects. In some cases, the polishing step may be performed by subdividing the polishing step into three or more steps. The polishing composition of the present embodiment can be used in any of these polishing steps, but is used in the first polishing step because it can reduce minute waviness on the surface of the magnetic disk substrate. Is preferred.
[0035]
Now, for example, when the first-stage polishing (primary polishing) of the Ni-P substrate surface is performed using the polishing composition of the present embodiment, the polishing is performed while supplying the polishing composition to the Ni-P substrate surface. Polish the Ni-P substrate surface with a pad. At this time, since the polishing composition contains the component (a), the Ni-P substrate surface can be polished at a constant polishing rate by the mechanical polishing action. Further, since the polishing composition contains the component (b), the chemical polishing action promotes the polishing, thereby obtaining a large polishing rate, and reducing the minute waviness on the surface to be polished to smooth the surface. Performance can be improved. In addition, by containing the component (d), a higher polishing rate can be obtained.
[0036]
According to the present embodiment described in detail above, the following effects are exhibited.
-The polishing composition of this embodiment contains the component (b). It is presumed that the component (b) has a polishing promoting effect similarly to succinic acid or a salt thereof, and has a higher effect of removing minute undulations than succinic acid or a salt thereof. For this reason, the polishing composition of this embodiment can improve the smoothness by reducing minute waviness on the surface to be polished as compared with the conventional polishing composition containing succinic acid or a salt thereof.
[0037]
-The polishing composition preferably contains the component (d). In this case, a high polishing rate can be obtained by the chemical polishing action of the component (d).
-Component (d) is malic acid, glycolic acid, succinic acid, citric acid, maleic acid, itaconic acid, malonic acid, iminodiacetic acid, gluconic acid, lactic acid, mandelic acid, tartaric acid, crotonic acid, nicotinic acid, acetic acid, glycine , Alanine, methanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, xylenesulfonic acid, thioacetic acid, mercaptosuccinic acid, at least one selected from the group consisting of aluminum nitrate and aluminum sulfate, malic acid, glycolic acid, succinic acid And at least one selected from the group consisting of, citric acid and iminodiacetic acid. In this case, a higher polishing rate can be obtained.
[0038]
-Component (a) is preferably aluminum oxide. In this case, the smoothness of the polished surface can be further improved, and a higher polishing rate can be obtained.
[0039]
Component (b) is preferably carboxyethylthiosuccinic acid, or its potassium salt or monoethanolamine salt. In this case, the smoothness of the polished surface can be further improved.
[0040]
The above-described embodiment can be modified as follows.
When the polishing composition is prepared, the content of the component (c) is set smaller than that used in the polishing step, whereby each component other than the component (c) is concentrated and used in the polishing step. Occasionally, it may be configured such that the component (c) is added and diluted. With such a configuration, the polishing composition can be easily managed and the transport efficiency can be improved.
[0041]
The surface to be polished may be polished in one step, or the polishing composition of the present embodiment may be used for finish polishing.
Examples of the object to be polished include a semiconductor substrate such as a semiconductor wafer and an optical lens in addition to the magnetic disk. These materials include tungsten, copper, silicon, glass, ceramic and the like.
[0042]
【Example】
Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1 to 16 and Comparative Examples 1 to 8)
In Example 1, first, aluminum oxide as the component (a), carboxyethyl thiosuccinic acid as the component (b), and water as the component (c) were mixed to prepare a polishing composition. Here, the particle diameter of the aluminum oxide is 0.8 μm as an average particle diameter measured by a laser diffraction / scattering particle size analyzer (LS-230; manufactured by Coulter), and the content in the polishing composition is 6 μm. % By weight. Table 1 shows the content of the component (b).
[0043]
In Examples 2 to 8, a polishing composition was prepared in the same manner as in Example 1 except that the type and content of the component (b) were changed as shown in Table 1. In Examples 9 to 16 and Comparative Examples 1 to 8, the type and content of the component (b) were changed as shown in Table 1, and the compounds shown in Table 1 were mixed as the component (d), except that A polishing composition was prepared in the same manner as in Example 1. The polishing composition of each example was evaluated for the following items (1) and (2). Table 1 shows the results. In Table 1, carboxyethylthiosuccinic acid is indicated by A1, monopotassium carboxyethylthiosuccinate is indicated by A2, dipotassium carboxyethylthiosuccinate is indicated by A3, and tripotassium carboxyethylthiosuccinate is indicated by A4. Indicated by Further, monoethanolamine carboxyethyl thiosuccinate is represented by A5, and the content of each component is represented by% by weight.
[0044]
(1) Microwaviness Using the polishing composition of each example, the surface of the object to be polished (electroless Ni-P substrate) was polished under the following polishing conditions. Next, using a non-contact type surface roughness measuring device (Micro XAM; manufactured by PhaseShift, Inc .; objective lens: × 10, filter: Ra value measured at Gaussian Bandpass 80 to 450 μm), and electroless Ni— after polishing. The magnitude of the undulation on the P substrate surface was measured. Then, the micro waviness was evaluated on a three-point scale: Ra was less than 4.5 ° (、), Ra was 4.5 ° or more and less than 5.0 ° (、), and Ra was 5.0 ° or more (△).
<Polishing conditions>
Object to be polished: Electroless Ni-P substrate having a diameter of 3.5 inches (≒ 95 mm), polishing machine: double-side polishing machine (platen diameter: 720 mm), polishing pad: polyurethane pad (BELLATRIX N0048; manufactured by Kanebo Corporation), Load: 100 g / cm 2 (≒ 10 kPa), upper platen rotation speed: 24 rpm, lower platen rotation speed: 16 rpm, supply amount of polishing composition: 150 ml / min, polishing amount: 3 μm as a margin for both sides
(2) Polishing rate After polishing the surface of the object to be polished (electroless Ni-P substrate) under the above-mentioned polishing conditions using the polishing composition of each example, the polishing rate was calculated based on the following formula. I asked. The polishing rate was 0.50 μm / min or more (m), the polishing rate was 0.45 μm / min or more and less than 0.50 μm / min (0), and the polishing rate was less than 0.45 μm / min (5). Was evaluated in three steps.
<Calculation formula for polishing rate>
Polishing rate [μm / min] = weight loss of electroless Ni-P substrate by polishing [g] ÷ (area of polished surface [cm 2 ] × density of Ni-P plating [g / cm 3 ] × polishing time) [Minute]) × 10000
[0045]
[Table 1]
As shown in Table 1, in Examples 1 to 16, the evaluation was excellent for the fine waviness and the polishing rate. Further, in Examples 9 to 16, since the component (d) was contained, the polishing rate was more excellent. Therefore, when the polishing compositions of Examples 1 to 16 are used, fine waviness can be reduced and smoothness can be improved, and when the polishing compositions of Examples 9 to 16 are used, a higher polishing rate is obtained. I was able to. On the other hand, in Comparative Examples 1 to 8, since the component (b) was not contained, the evaluation was inferior to the fine undulation as compared with each Example.
[0046]
Next, technical ideas that can be grasped from the embodiment will be described below.
(1) The polishing composition according to any one of claims 1 to 3, wherein the component (a) is aluminum oxide. According to this configuration, the smoothness can be further improved by further reducing the minute waviness of the surface to be polished, and a higher polishing rate can be obtained.
[0047]
(2) The component (b) is at least one selected from the group consisting of carboxyethylthiosuccinic acid and potassium salts and monoethanolamine salts thereof, according to any one of claims 1 to 3 and (1). Polishing composition. According to this configuration, the smoothness can be further improved by further reducing the minute waviness of the surface to be polished.
[0048]
(3) The component (d) is at least one selected from the group consisting of malic acid, glycolic acid, succinic acid, citric acid and iminodiacetic acid, wherein the component (d) is at least one selected from the group consisting of: The polishing composition according to any one of (1) to (4). According to this configuration, a higher polishing rate can be obtained.
[0049]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
According to the polishing composition of the first aspect of the present invention, it is possible to reduce fine waviness on the surface to be polished and improve smoothness.
[0050]
According to the polishing composition of the second and third aspects of the invention, in addition to the effect of the first aspect of the invention, a higher polishing rate can be obtained.
Claims (3)
Priority Applications (4)
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JP2003132313A JP4068499B2 (en) | 2003-05-09 | 2003-05-09 | Polishing composition |
MYPI20041723A MY139093A (en) | 2003-05-09 | 2004-05-07 | Polishing composition |
GB0410212A GB2401370B (en) | 2003-05-09 | 2004-05-07 | Polishing composition |
CN200410043511.8A CN100547045C (en) | 2003-05-09 | 2004-05-09 | Polishing composition |
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JP2003132313A JP4068499B2 (en) | 2003-05-09 | 2003-05-09 | Polishing composition |
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JP4068499B2 JP4068499B2 (en) | 2008-03-26 |
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JP2007214205A (en) * | 2006-02-07 | 2007-08-23 | Fujimi Inc | Polishing composition |
JP2008179762A (en) * | 2006-12-26 | 2008-08-07 | Kao Corp | Silica particle dispersion for polishing |
JP2010080030A (en) * | 2008-09-29 | 2010-04-08 | Hoya Corp | Method for manufacturing glass substrate for magnetic disk, and method for manufacturing magnetic disk |
JP2010540265A (en) * | 2007-10-05 | 2010-12-24 | サン−ゴバン セラミックス アンド プラスティクス,インコーポレイティド | Polishing sapphire with composite slurry |
WO2014013977A1 (en) * | 2012-07-17 | 2014-01-23 | 株式会社 フジミインコーポレーテッド | Composition for polishing alloy material and method for producing alloy material using same |
US8815396B2 (en) | 2007-10-05 | 2014-08-26 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive particles comprising nano-sized silicon carbide particles surface-coated with silica, and methods using same |
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FR2767824B1 (en) * | 1997-08-27 | 1999-10-08 | Elf Aquitaine Exploration Prod | SYNTHESIS OF CARBOXYALKYLTHIOSUCCINIC ACIDS |
JP3998813B2 (en) * | 1998-06-15 | 2007-10-31 | 株式会社フジミインコーポレーテッド | Polishing composition |
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JP4095833B2 (en) * | 2002-05-30 | 2008-06-04 | 株式会社フジミインコーポレーテッド | Polishing composition |
-
2003
- 2003-05-09 JP JP2003132313A patent/JP4068499B2/en not_active Expired - Fee Related
-
2004
- 2004-05-07 GB GB0410212A patent/GB2401370B/en not_active Expired - Fee Related
- 2004-05-07 MY MYPI20041723A patent/MY139093A/en unknown
- 2004-05-09 CN CN200410043511.8A patent/CN100547045C/en not_active Expired - Fee Related
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CN1550531A (en) | 2004-12-01 |
JP4068499B2 (en) | 2008-03-26 |
GB2401370B (en) | 2007-12-05 |
GB0410212D0 (en) | 2004-06-09 |
GB2401370A (en) | 2004-11-10 |
CN100547045C (en) | 2009-10-07 |
MY139093A (en) | 2009-08-28 |
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