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Lubricants for Magnetic Recording Media

IP.com Disclosure Number: IPCOM000092540D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Friedman, H: AUTHOR

Abstract

Normally two pigments are used in making a magnetic composition for use in producing magnetic recording media. One pigment is particulate magnetic material such as delta - Fe(2)O(3). The second pigment is a conductive material such as carbon black.

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Lubricants for Magnetic Recording Media

Normally two pigments are used in making a magnetic composition for use in producing magnetic recording media. One pigment is particulate magnetic material such as delta - Fe(2)O(3). The second pigment is a conductive material such as carbon black.

The addition of carbon particles to the composition often results in signal loss. Excessive signal loss is avoided by processing the composition in the following manner:

1. Carbon black and solvent are slurried in a ball mill or attritor mill for a period of about 15 minutes.

2. The binder components of the composition are added to the mill and the mixture is milled for about one hour.

3. Half of the binder-carbon mixture is removed from the mill and stored.

4. All of the magnetic particles are added to the binder-carbon mixture remaining in the mill. This charge is milled until a satisfactory dispersion is obtained.

5. The binder-carbon mixture which is earlier removed from the mill is now returned to the mill slowly and with good mixing.

6. The ingredients now in the mill are mixed until a satisfactory dispersion is obtained.

The magnetic composition resulting from this process results in magnetic recording media having good signal output.

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