Patent ID: 8119268
Filing Date: 2012-02-21
Classification: C03C,G11B,Y10T

Abstract:
1. An information recording media, comprising glass substrate for a magnetic disk and a magnetic recording layer formed thereon, wherein said glass substrate comprises, as represented by mol % based on oxide: from 61 to 66% of SiO from 11.5 to 17% of Al from 8 to 16% of Li from 2 to 8% of Na from 2.5 to 8% of K from 0 to 6% of MgO, from 0 to 4% of TiO from 0 to 3% of ZrO from 0 to 1% of at least one alkaline earth metal oxide selected from the group consisting of CaO, SrO and BaO; provided that Al