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1. (WO2017061501) GLASS FOR DATA STORAGE MEDIUM SUBSTRATE, GLASS SUBSTRATE FOR DATA STORAGE MEDIUM, AND MAGNETIC DISK
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2017/061501    International Application No.:    PCT/JP2016/079688
Publication Date: 13.04.2017 International Filing Date: 05.10.2016
IPC:
C03C 3/087 (2006.01), C03C 21/00 (2006.01), G11B 5/73 (2006.01)
Applicants: ASAHI GLASS COMPANY, LIMITED [JP/JP]; 5-1, Marunouchi 1-chome, Chiyoda-ku, Tokyo 1008405 (JP)
Inventors: MAEDA Eriko; (JP).
HIJIYA Hiroyuki; (JP).
NAGAI Kensuke; (JP).
NAKASHIMA Tetsuya; (JP).
KUROIWA Yutaka; (JP)
Agent: EIKOH PATENT FIRM, P.C.; Toranomon East Bldg. 10F, 7-13, Nishi-Shimbashi 1-chome, Minato-ku, Tokyo 1050003 (JP)
Priority Data:
2015-197643 05.10.2015 JP
2015-238570 07.12.2015 JP
2016-067793 30.03.2016 JP
2016-193971 30.09.2016 JP
Title (EN) GLASS FOR DATA STORAGE MEDIUM SUBSTRATE, GLASS SUBSTRATE FOR DATA STORAGE MEDIUM, AND MAGNETIC DISK
(FR) VERRE POUR SUBSTRAT DE SUPPORT D’INFORMATIONS, SUBSTRAT DE VERRE POUR SUPPORT D’INFORMATIONS, ET DISQUE MAGNÉTIQUE
(JA) データ記憶媒体基板用ガラス、データ記憶媒体用ガラス基板および磁気ディスク
Abstract: front page image
(EN)The present invention pertains to a glass for a data storage medium substrate which contains a specific amount of each of SiO2, Al2O3, MgO, CaO, SrO, BaO, Li2O, Na2O, and K2O, in molar percentage based on the oxides, and does not substantially contain B2O3 or ZrO2, wherein the sum of the Li2O, Na2O, and K2O contents (R2O), the molar ratio of the SiO2 content to the Al2O3 content (SiO2/Al2O3), and the molar ratio of the sum of the SiO2 and Al2O3 contents (SiO2+Al2O3) to R2O [(SiO2+Al2O3)/R2O] fall within their specific ranges, formula (1): 90 < [SiO2] + 2 × [Al2O3] + 0.8 × [RO] - 0.5 × [R2O] [in formula (1), RO represents the sum of the MgO, CaO, SrO, and BaO contents] is satisfied, and the glass transition point Tg, the alkali resistance, and the acid resistance fall within their specific ranges.
(FR)La présente invention concerne un verre pour un substrat de support d’informations qui contient une quantité spécifique de chacun des éléments suivants : SiO2, Al2O3, MgO, CaO, SrO, BaO, Li2O, Na2O, et K2O, en pourcentage molaire basé sur les oxydes, et ne contenant sensiblement pas de B2O3 ou de ZrO2, la somme des teneurs en Li2O, Na2O, et K2O (R2O), le rapport molaire entre la teneur en SiO2 et la teneur en Al2O3 (SiO2/Al2O3), et le rapport molaire entre la somme des teneurs en SiO2 et en Al2O3 (SiO2+Al2O3) et R2O [(SiO2+Al2O3)/R2O] se situe dans leurs plages spécifiques, la formule (1) : 90 < [SiO2] + 2 × [Al2O3] + 0,8 × [RO] – 0,5 × [R2O] [dans la formule (1), RO représente la somme des teneurs en MgO, CaO, SrO, et BaO] est satisfaite, et le point de transition vitreuse Tg, la résistance aux alcalis, et la résistance aux acides se situent dans leurs plages spécifiques.
(JA)本発明は、下記酸化物基準のモル百分率表示で、SiO、Al、MgO、CaO、SrO、BaO、LiO、NaOおよびKOをそれぞれ特定量含み、BおよびZrOを実質的に含まず、LiO、NaOおよびKOの含有量合計(RO)、Al含有量に対するSiO含有量のモル比(SiO/Al)並びにROに対するSiOおよびAlの含有量合計(SiO+Al)のモル比[(SiO+Al)/RO]が特定範囲であり、式(1):90<[SiO]+2×[Al]+0.8×[RO]-0.5×[RO][式(1)において、ROはMgO、CaO、SrOおよびBaOの含有量合計を表す。]を満たし、ガラス転移点T、耐アルカリ性および耐酸性が特定範囲であるデータ記憶媒体基板用ガラスに関する。
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)