Magnetic recording medium and method for manufacturing the same

Details Magnetic recording medium and method for manufacturing the same Magnetic recording medium and method for manufacturing the same

2005-01-11

2009-10-13

Tarazano, D. Lawrence (Department: 1794)

Coating processes

With post-treatment of coating or coating material

Heating or drying

C427S127000, C427S128000, C427S130000

Reexamination Certificate

active

07601395

ABSTRACT:
A high recording density magnetic recording medium and a manufacturing method therefor are provided. The dilution stability during preparation of magnetic paint is improved and, thereby, even when the magnetic paint concentration is lowered, no problem occurs with the surface roughness and the output of the thin magnetic layer. The magnetic recording medium includes at least a magnetic layer on one surface of a non-magnetic support, wherein the magnetic layer contains a magnetic powder, a vinyl chloride resin having a degree of polymerization of at least 270 and an aliphatic polyester polyurethane resin to serve as binder resins, an aromatic compound having a substituent R (where R is —COOH, —(COOH)2, —OPO(OH)2, —PO(OH)2, or —SO3H), and a phosphoric acid ester. The ratio of binder resins in the magnetic paint is set at 2.0 percent by weight or less relative to a total sum of the binder resins and a solvent.

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