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发明公开
CN102320742A 数据存储介质用基板玻璃及玻璃基板 无效 - 驳回

数据存储介质用基板玻璃及玻璃基板
摘要：
本发明的目的是提供即使不进行化学强化处理等附加处理耐候性也优良、不易发生白斑现象、玻璃化温度在685℃以上、且耐酸性优良的数据存储介质用基板用玻璃。本发明的数据存储介质用基板玻璃的特征在于，以质量％表示含有47～60％的SiO2、8～20％的Al2O3、0～8％的MgO、0～2.4％的CaO、1～18％的SrO、0～13％的BaO、1～6％的TiO2、1～5％的ZrO2、2～8％的Na2O、1～15％的K2O，K2O/Na2O：2.2～40，玻璃化温度在685℃以上。
摘要（英）：

To provide a substrate glass for data storage medium which is excellent in weather resistance even when no additional treatment such as chemical reinforcement treatment is applied and less susceptible to a whitening phenomenon and which has a glass transition temperature of at least 680 DEG C and is excellent in acid resistance. A substrate glass for data storage medium, which comprises, as represented by mass %, from 47 to 60% of SiO2, from 8 to 20% of Al2O3, from 0 to 8% of MgO, from 0 to 6% of CaO, from 1 to 18% of SrO, from 0 to 13% of BaO, from 1 to 6% of TiO2, from 1 to 5% of ZrO2, from 2 to 8% of Na2O and from 1 to 15% of K2O and which has a glass transition temperature of at least 680 DEG C.

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