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US 6,638,622 B2Granted
Perfluorinated polyethers with metal carboxylate end groups as anti-wetting and corrosion-protective agents
AssigneeHitachi Global Storage Technologies
InventorsQing Dai, Paul Haruo Kasai, Wing Tsang Tang
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Abstract
A process is provided for synthesizing metal salts of perfluorinated polyethers containing at least one carboxylic acid group. The polymeric salts so provided are effective as anti-wetting and corrosion-protective agents. The metal salts of perfluorinated polyether acids may be used to prepare corrosion-protected substrates, including magnetic recording disks and magnetic recording heads.
Claims16
A corrosion-protected magnetic recording disk, comprising:
- a substrate;
- a magnetic layer formed over the substrate;
- an overcoat formed over the magnetic layer, the overcoat comprising primarily carbon in the essentially amorphous form and having pinholes therein exposing the magnetic layer;
- and
- a corrosion-protective agent comprised of a metal salt of a perfluorinated polyether having at least one carboxylic acid group. a metal salt of a partially hydrogenated perfluorinated polyether having at least one carboxylic acid group, or a mixture thereof, filling the pinholes of the overcoat.
2 more elements
Dependencies are inferred from the claim text.