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Protective Coating for Optically Thin Recording Films

IP.com Disclosure Number: IPCOM000076991D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Damm, EP: AUTHOR [+4]

Abstract

Data records formed by laser evaporation of hole patterns in optically thin-aluminum films on the order of 500 angstroms adhered to comparatively thick-plastic substrata, require protective coating of the aluminum film to prevent damage in handling. The protective coating should not obstruct the laser recording process (i.e. not increase the required laser power or conversely decrease the recording rate).

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Protective Coating for Optically Thin Recording Films

Data records formed by laser evaporation of hole patterns in optically thin- aluminum films on the order of 500 angstroms adhered to comparatively thick- plastic substrata, require protective coating of the aluminum film to prevent damage in handling. The protective coating should not obstruct the laser recording process (i.e. not increase the required laser power or conversely decrease the recording rate).

A suitable protective coating which fulfills these requirements, is formed by electrophoretic deposition of polymer from a bath composed of blended latices of ELVAX* D1263/ARALDITE** 624 50/50. The coating is formed to a thickness of about 0.0001 inch, by subjection of the immersed 500 angstroms aluminum to 20 volts electrophoresis potential for 5 seconds at 180 degrees F. For an aluminum film of even smaller thickness on the order of 160 angstroms deposition of polymer for 0.5 second at 0.5 volt suffices. * Trademark of E. I. de Pont de Nemours & Co. ** Trademark of CIBA Products Co.

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