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High Purity Polyimide Undercoat to Enhance Magnetic Properties and Corrosion Protection for Thin and Thick Film Recording Disks

IP.com Disclosure Number: IPCOM000049048D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09

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Duran, J Missel, L Montelbano, TO Tzanavaras, G [+details]


The present aluminum substrate used for recording disks has a very large grain size which induces corrosion in the device structure. Also, the undercoat material used to protect the surface from corrosion is highly stressed and causes non-reproducibility of the magnetic properties (metal-to-metal contact diffusion and galvanic coupling).