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1. (WO2013146256) GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, AND GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND USE THEREOF
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2013/146256    International Application No.:    PCT/JP2013/056966
Publication Date: 03.10.2013 International Filing Date: 13.03.2013
IPC:
G11B 5/73 (2006.01), C03C 3/078 (2006.01), C03C 3/085 (2006.01), C03C 3/087 (2006.01), C03C 3/095 (2006.01), C03C 3/097 (2006.01), G11B 5/02 (2006.01), G11B 5/64 (2006.01), G11B 5/82 (2006.01), G11B 5/84 (2006.01), C03C 21/00 (2006.01)
Applicants: HOYA CORPORATION [JP/JP]; 7-5, Naka-Ochiai 2-chome, Shinjuku-ku, Tokyo 1618525 (JP)
Inventors: MATSUMOTO, Naomi; (JP).
HASHIMOTO, Kazuaki; (JP)
Agent: SIKS & CO.; 8th Floor, Kyobashi-Nisshoku Bldg., 8-7, Kyobashi 1-chome, Chuo-ku, Tokyo 1040031 (JP)
Priority Data:
2012-076309 29.03.2012 JP
Title (EN) GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, AND GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND USE THEREOF
(FR) VERRE POUR SUBSTRAT DE SUPPORT D'ENREGISTREMENT MAGNÉTIQUE, ET SUBSTRAT EN VERRE POUR SUPPORT D'ENREGISTREMENT MAGNÉTIQUE ET UTILISATION DE CE VERRE
(JA) 磁気記録媒体基板用ガラス、磁気記録媒体用ガラス基板およびその利用
Abstract: front page image
(EN)One embodiment of the present invention relates to a glass for a magnetic recording medium substrate, which contains SiO2, Li2O, Na2O and at least one alkali earth metal oxide selected from the group consisting of MgO, CaO, SrO and BaO as essential components, wherein the molar ratio of the content of CaO relative to the total content of MgO, CaO, SrO and BaO (i.e., (CaO/(MgO+CaO+SrO+BaO)) is 0.20 or less, and the glass transition temperature of the glass is 650˚C or higher.
(FR)Un mode de réalisation de la présente invention concerne un verre pour un substrat de support d'enregistrement magnétique, qui contient du SiO2, du Li2O, du Na2O et au moins un oxyde de métal alcalino-terreux sélectionné dans le groupe consistant en le MgO, CaO, SrO et BaO en tant que composants essentiels, le rapport molaire de la teneur en CaO par rapport à la teneur totale en MgO, CaO, SrO et BaO (c'est-à-dire, (CaO/(MgO + CaO + SrO + BaO)) est égal à 0,20 ou moins, et la température de transition vitreuse du verre est de 650 °C ou plus.
(JA)本発明の一態様は、必須成分として、SiO2、Li2O、Na2O、ならびに、MgO、CaO、SrOおよびBaOからなる群から選ばれる一種以上のアルカリ土類金属酸化物を含み、MgO、CaO、SrOおよびBaOの合計含有量に対するCaOの含有量のモル比(CaO/(MgO+CaO+SrO+BaO))が0.20以下、ガラス転移温度が650℃以上である磁気記録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, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, 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, 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, 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, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)