AQUEOUS CLEANING COMPOSITION FOR SUBSTRATE FOR PERPENDICULAR MAGNETIC RECORDING HARD DISK

摘要

AN AQUEOUS CLEANING COMPOSITION FOR A SUBSTRATE FOR A PERPENDICULAR MAGNETIC RECORDING HARD DISK INCLUDING A Ni-P CONTAINING LAYER CONTAINS AT LEAST ONE SURFACTANT SELECTED FROM THE GROUP CONSISTING OF SURFACTANTS REPRESENTED BY FORMULAS (1) TO (6) AND HAS A PH AT 25°C OF 5 OR LESS. IN FORMULA (1), R¹ IS AN ALKYL GROUP HAVING A CARBON NUMBER OF 10 TO 16, AND X IS A HALOGEN ATOM.