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Magnetic Recording Media

IP.com Disclosure Number: IPCOM000093414D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

Magnetic recording media normally consists of a polymeric binder composition, including particulate ferromagnetic material, supported on a substrate. In order to meet the requisites of durability, abrasion resistance, lightweight and temperature stability required by high-speed recording systems, the polymeric binder composition must be chosen with a high degree of care. Most commonly, a blend of polymeric materials is chosen in order to obtain different properties from the various materials.

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Magnetic Recording Media

Magnetic recording media normally consists of a polymeric binder composition, including particulate ferromagnetic material, supported on a substrate. In order to meet the requisites of durability, abrasion resistance, lightweight and temperature stability required by high-speed recording systems, the polymeric binder composition must be chosen with a high degree of care. Most commonly, a blend of polymeric materials is chosen in order to obtain different properties from the various materials.

One composition for magnetic recording media includes mixed polycarbonates and linear epoxy or polyhydroxy ethers. The polycarbonates can be of the aryl or mixed aryl aliphatic type. Polycarbonates are reactions products of esters and carbonic acid and can be represented by the general formula: in which R is at least a difunctional organic radical. In the preferred compound, R is the bis-phenol A radical and the resulting polycarbonate resin can be generally represented as:

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Preferred polyhydroxy ether compounds are reaction products of bis-phenol A and epichlorohydrin having a structure represented by:

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In addition, conductive materials such as carbon black, dispersing agents, or lubricants can be added to the composition. The composition can also be modified by blending it with other thermoplastic or elastomeric resins. Examples of such other resins include polyamides, polyimides, polyethers, polyesters, acronitrile-bu...