METHOD FOR MANUFACTURING AN ALUMINOSILICATE GLASS SUBSTRATE FOR HARD DISKS

• Main Authors: UCHINO, YOSUKE, NISHIMOTO, KAZUHIKO, DOI, HARUHIKO
• Format: Patent
• Language: English
• Published: 17.11.2015
• Subjects: ADHESIVES; CHEMISTRY; DRESSING OR CONDITIONING OF ABRADING SURFACES; DYES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS; GRINDING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PERFORMING OPERATIONS; PHYSICS; POLISHES; POLISHING; TRANSPORTING

A METHOD FOR MANUFACTURING AN ALUMINOSILICATE GLASS SUBSTRATE FOR A HARD DISK OF THE PRESENT INVENTION INCLUDES POLISHING AN ALUMINOSILICATE GLASS SUBSTRATE TO BE POLISHED WITH A POLISHING COMPOSITION THAT INCLUDES SILICA PARTICLES, A POLYMER HAVING A SULFONIC ACID GROUP, AND WATER, WHEREIN AN ADSORPTION CONSTANT OF THE POLYMER HAVING THE SULFONIC ACID GROUP ON ALUMINOSILICATE GLASS IS 1.5 TO 5.0 L/G. THE POLYMER HAVING THE SULFONIC ACID GROUP IS PREFERABLY A POLYMER HAVING AN AROMATIC RING. THE WEIGHT AVERAGE MOLECULAR WEIGHT OF THE POLYMER HAVING THE SULFONIC ACID GROUP IS 3000 TO 100000.