Browse Prior Art Database

Magnetic Recording Media

IP.com Disclosure Number: IPCOM000080543D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 3 page(s) / 27K

Publishing Venue

IBM

Related People

Chang, PT: AUTHOR [+3]

Abstract

Described is a recording media composed of either a metal, glass, polymer or ceramic substrate, upon which a layer of organic polymer adhesive sealant and a layer of magnetic particles have been deposited. The thickness of each of these layers can be carefully controlled within 2 or 3 microinches. A portion of the organic polymer is allowed to diffuse into the magnetic layer and to act as an adhesive matrix material. A two or three microinch overcoat of organic polymer sealant may be applied, if desired.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Magnetic Recording Media

Described is a recording media composed of either a metal, glass, polymer or ceramic substrate, upon which a layer of organic polymer adhesive sealant and a layer of magnetic particles have been deposited. The thickness of each of these layers can be carefully controlled within 2 or 3 microinches. A portion of the organic polymer is allowed to diffuse into the magnetic layer and to act as an adhesive matrix material. A two or three microinch overcoat of organic polymer sealant may be applied, if desired.

The magnetic material, if acicular in shape, is deposited uniformly as discrete particles, no agglomerates, in a 2-D configuration with approximately a 50% packing density. The application of a magnetic field during the deposition process can further align these particles. The figure shows the structure of the recording media. Substrate 1 has organic polymer adhesive 2 thereon. Then, magnetic layer 3 is deposited, followed by the organic polymers 4.

The organic polymer adhesive 2 must have several properties. It must form a strong bond with the substrate 1 and with the magnetic particle layer 3. Further, it must be able to be applied to the substrate surface either by utilizing dipping or spin coating techniques, which will leave a smooth tack-free surface upon solvent removal before curing. It also must upon heating go through a liquid state, in which the polymer will wet and penetrate the magnetic particle layer 3 before the final cure temperature is obtained. The organic polymer 2 will form a matrix binder for the magnetic particle layer 3.

Such organic materials include epoxy-melamine, epoxy-urea and epoxy- phenolic. The normal organix polymer thickness as initially deposited would be between 2 to 20 microinches.

Where the magnetic particles are gamma ferric oxide, they are distributed as slightly interlocking particles in a 2-D arrangement. The particles may be aligned further by the application of a magnetic field.

The magnetic particles may also include other magnetic oxides such as Fe(3)0(4), CoO, or CrO(2) or may be magnetic metal particles such as FeCO, etc. Optionally, there is the final overcoat layer which is a 2 micro inch organic polymer adhesive. The organic polymer adhesive would normally be of the same composition as the base adhesive 2.

The substrate 1 is cleaned and the organic polymer adhesive 2 is deposited thereon in a known manner, as by spin coating.

Three water based solutions are require...