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Magnetic Recording Surface

IP.com Disclosure Number: IPCOM000095721D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Garrick, M: AUTHOR [+2]

Abstract

The binder matrix for the magnetic material in a magnetic recording surface is chosen using the particular substrate surface composition as an important criteria. A magnetic coating usable on a variety of surfaces is a condensation product of epichlorohydrin and bisphenol A, urea formaldehyde and ethyl acid phosphate. The materials are dissolved in a suitable solvent, coated onto the desired substrate, and heated at 310 degrees F. for 30 minutes to drive off the solvents and cure the binder portion of the formulation.

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Magnetic Recording Surface

The binder matrix for the magnetic material in a magnetic recording surface is chosen using the particular substrate surface composition as an important criteria. A magnetic coating usable on a variety of surfaces is a condensation product of epichlorohydrin and bisphenol A, urea formaldehyde and ethyl acid phosphate. The materials are dissolved in a suitable solvent, coated onto the desired substrate, and heated at 310 degrees F. for 30 minutes to drive off the solvents and cure the binder portion of the formulation.

The following is an example of a typical magnetic coating composition which is usable on epoxy impregnated paper, epoxy resin with a fiber glass or other filler, phenolic and copper surfaces: Parts

Magnetic iron oxide 77.1 grams

Epichlorohydrin-bisphenol A 24.4 grams

Urea formaldehyde 31.0 grams

Ethyl acid phosphate 5.0 grams.

The coating has excellent adherence to these substrate materials, resistance to abrasion, thermal shock, solvents and chemical plating and etching solutions.

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