Magnetic disk coatings
AssigneeInternational Business Machines Corporation
InventorsHeidi L. Dickstein, William H. Dickstein
Life of this patent
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Abstract
A magnetic disk coating composition contains magnetic particles and a binder system comprising epoxy and phenolic resins, a titanate coupling agent and a water miscible solvent system, the coating having a pigment volume concentration of up to 35.
Claims6
A mixture for coating a magnetic recording member to produce a magnetic coating having magnetic particles in a binder system in a pigment volume concentration of up to 35, where pigment volume concentration is defined as the ratio of the volume of said magnetic particles to the sum of the volume of said binder system and the volume of said magnetic particles, comprising
- said binder system including
- a water-miscible solvent system comprising glycol ethyl ether, hydroxyethylacetate and diethyleneglycolbutylether,
- an epoxy resin selected from a group of epoxy resins which are soluble in each component of said water-miscible solvent system,
- a phenolic resin selected from a group of phenolic resins which are soluble in each component of said water-miscible solvent system, and
- a titanate coupling agent for improving the bond of said magnetic particles to said resins and for catalyzing the cross-linking of said resins,
- each of said components of said water-miscible solvent system being compatible with said titanate coupling agent.
Dependencies are inferred from the claim text.