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Polyimide As Binder in Magnetic Coatings

IP.com Disclosure Number: IPCOM000045901D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Duran, J: AUTHOR [+3]

Abstract

A high molecular weight, high purity polyimide forms an excellent binder material for a magnetic coating composition in a magnetic recording disk. The following steps can be employed. 1. Add a designated amount of Fe/2/O/3/ to a suitable high molecular weight polyamic acid, and mix thoroughly. 2. Apply the mixture to a disk substrate by spin coating or some other technique, and cure.

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Polyimide As Binder in Magnetic Coatings

A high molecular weight, high purity polyimide forms an excellent binder material for a magnetic coating composition in a magnetic recording disk. The following steps can be employed. 1. Add a designated amount of Fe/2/O/3/ to a suitable

high molecular weight polyamic acid, and mix

thoroughly.

2. Apply the mixture to a disk substrate by spin

coating or some other technique, and cure.

Three-inch coupons of aluminum have been successfully coated with thick and thin films with this process.

10 x 10 mm samples were cut from the substrate, and MH loops were obtained from them in a Vibrating Sample Magnetometer (VSM). The VSM showed good, square loops with coercivities between 390-500 Oe, and the orientation of the Fe/2/O/3/ oxide could be achieved by coating with an applied magnetic field. Saturation magnetic moment densities of approximately 0.01-0.3 e Mu/cm/2/ were achieved with varying Fe/2/O/3/ concentrations.

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