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Magnetic Media Composition Disclosure Number: IPCOM000040697D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02

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Bradshaw, RL Merten, RA Sage, GK [+details]


A magnetic coating composition for flexible media includes chromium dioxide magnetic particles, a polyester polyurethane, a crosslinking agent, a tridecyl stearate lubricant and a dispersant. The formulation can be coated onto a substrate of polyethylene terephthalate to produce a stick-free magnetic media. The magnetic media coating composition is based on chromium dioxide magnetic particles in an organic binder. The binder consists of a polyurethane resin constructed from a polyester resin and a hydroxyl-terminated chain extender which has been reacted with an aromatic diisocyanate. A polyfunctional isocyanate crosslinking agent is added together with a soybean lecithin pigment dispersing agent. The composition is coated on an organic substrate to produce the magnetic media.