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US08715841B2 Glass substrate for information recording medium and information recording medium 有权
用于信息记录介质和信息记录介质的玻璃基板

  • Patent Title: Glass substrate for information recording medium and information recording medium
  • Patent Title (中): 用于信息记录介质和信息记录介质的玻璃基板
  • Application No.: US13003699
    Application Date: 2009-07-03
  • Publication No.: US08715841B2
    Publication Date: 2014-05-06
  • Inventor: Hideki Kawai
  • Applicant: Hideki Kawai
  • Agency: Brinks Gilson & Lione
  • Priority: JP2008-182491 20080714
  • International Application: PCT/JP2009/062187 WO 20090703
  • International Announcement: WO2010/007903 WO 20100121
  • Main IPC: G11B5/33
  • IPC: G11B5/33 ;  C03B29/00 ;  B05D5/12
Glass substrate for information recording medium and information recording medium
Abstract:
A glass substrate for information recording medium, said glass substrate being composed of an aluminosilicate glass containing 60-75% by mass of SiO2, 5-18% by mass of Al2O3, 3-10% by mass of Li2O, 3-15% by mass of Na2O and 0.5-8% by mass of ZrO2 relative to the entire glass components. The glass substrate for information recording medium contains neither As (arsenic) nor Sb (antimony), while containing at least one substance selected from the group consisting of SO3 (sulfurous acid), F (fluorine), Cl (chlorine), Br (bromine) and I (iodine), as a refining agent. The molar ratio of the total amount of the refining agent to the amount of ZrO2 is within the range of 0.05-0.50.
Abstract(Chinese):

一种用于信息记录介质的玻璃基板，所述玻璃基板由含有60-75质量％SiO 2的铝硅酸盐玻璃，5-18质量％的Al 2 O 3，3-10质量％的Li 2 O，3-15％的 质量的Na 2 O和0.5〜8质量％的ZrO 2相对于整个玻璃组分。 用于信息记录介质的玻璃基板既不含As（砷）也不含Sb（锑），同时含有选自SO 3（亚硫酸），F（氟），Cl（氯），Br（溴） ）和I（碘）作为澄清剂。 精炼剂的总量与ZrO 2的摩尔比在0.05-0.50的范围内。

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