Substrate for magnetic recording media using dried...

Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic recording media substrate

Reexamination Certificate

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C428S847000, C428S848200, C428S847800, C427S129000

Reexamination Certificate

active

07147944

ABSTRACT:
The gas components in thermoplastic norbornene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin dried by the method according to the invention. The magnetic recording medium, employing the substrate manufactured according to the invention, includes at least a magnetic layer, a protection layer on the magnetic layer and a liquid lubricant layer on the protection layer. The magnetic recording medium is manufactured by forming these layers, one after another, on the substrate according to the invention.

REFERENCES:
patent: 5187012 (1993-02-01), Takashashi et al.
patent: 5366812 (1994-11-01), Takahashi et al.
patent: 5439722 (1995-08-01), Brekner et al.
patent: 5585989 (1996-12-01), Kuromiya et al.
patent: 6333089 (2001-12-01), Hirata et al.
patent: 6991863 (2006-01-01), Murata et al.
patent: 2001/0056051 (2001-12-01), Tei et al.
patent: 7-224155 (1995-08-01), None
patent: 11-166039 (1999-06-01), None
Derwent Abstract Accession No. 2001-231064/24, JP 2001034930 A; Nippon Zeon KK; Feb. 9, 2001.

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