Magnetic recording medium, manufacturing method, and use thereof

Patent metadata

Field	Value
Publication number	US-8980449-B2
Application number	US-201214118478-A
Country	US
Kind code	B2
Filing date	Nov 2, 2012
Priority date	Jan 27, 2012
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

A magnetic recording medium includes a nonmagnetic substrate provided on which are, in the order recited; an underlayer; a magnetic layer; a protective layer comprised of carbon; and a lubricating layer composed of a lubricant mixture composed of a lubricant represented by Formula (I) below

where m is an integer equal to or greater than 1, and R 1 and R 2 are divalent straight chains consisting of both —CH 2 CF 2 — or both —CH 2 CF 2 CF 2 —; and
a lubricant represented by Formula (II) below

where p and q are integers equal to or greater than 0, provided that p =q =0 is excluded. A method of manufacturing the magnetic recording medium is likewise disclosed.

First claim

The invention claimed is:

1. A magnetic recording medium, comprising:
a nonmagnetic substrate provided on which are, in the order recited;
an underlayer;
a magnetic layer;
a protective layer comprised of carbon; and
a lubricating layer comprised of:
a lubricant mixture comprising a lubricant represented by Formula (I) below

where m is an integer equal to or greate…

Assignees

• Fuji Electric Co Ltd

Inventors

• Matsumoto Takako
• Watanabe Takeshi

Classifications

• C10N2040/18

  Chemistry & Metallurgy · mapped topic

• C10M169/04 Primary

  Chemistry & Metallurgy · mapped topic

• C10M2213/0606

  Chemistry & Metallurgy · mapped topic

• C10M2223/08

  Chemistry & Metallurgy · mapped topic

• G11B5/725 Primary

  Physics · mapped topic