Patent ID: 8062778
Filing Date: 2011-11-22
Classification: C10M,C10N,G11B

Abstract:
1. A magnetic recording disk comprising a nonmagnetic substrate on which at least a magnetic layer, a protective layer, and a lubricating layer are arranged in that order, wherein the lubricating layer is made from a lubricant; the lubricant contains principal components which are perfluoropolyether compounds represented by the following chemical formula (Chemical Formula 1) and which are a first component having terminal groups X represented by X1, a second component having terminal groups X represented by X2, and a third component having terminal groups X represented by X3; and the ratio of the content of the first component to that of the second component to that of the third component in the perfluoropolyether compounds ranges from (71 to 73):(15 to 17):(11 to 13) on a molar basis in the case where the lubricant is analyzed by nuclear magnetic resonance spectroscopy: first component: X=X second component: X=X third component: X=X