Browse Prior Art Database

Magnetic Media Composition

IP.com Disclosure Number: IPCOM000040697D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

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

Abstract

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.