Browse Prior Art Database

Application of Insulating Varnish to Substrate

IP.com Disclosure Number: IPCOM000093748D
Original Publication Date: 1966-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Schelberg, CC: AUTHOR

Abstract

To prepare a substrate for the deposition of memory films, it is common practice to coat the substrate first with PYRE-M.L.*, an insulating varnish sold by E.I. du Pont de Nemours & Co., then with a smoothing layer of silicon monoxide or the like. With the present method, PYRE-M.L. can be applied so smoothly to a substrate that it is unnecessary to use a silicon monoxide overlay in order to achieve high smoothness of the insulating surface.

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Application of Insulating Varnish to Substrate

To prepare a substrate for the deposition of memory films, it is common practice to coat the substrate first with PYRE-M.L.*, an insulating varnish sold by E.I. du Pont de Nemours & Co., then with a smoothing layer of silicon monoxide or the like. With the present method, PYRE-M.L. can be applied so smoothly to a substrate that it is unnecessary to use a silicon monoxide overlay in order to achieve high smoothness of the insulating surface.

The substrate is cleaned ultrasonically and is placed upon a vacuum hold- down spin table. While the table is being spun at 800 revolutions per minute, nitrogen is blown onto the substrate to remove any dust particles. Then the PYRE-M.L. is poured onto the substrate until it runs over the edges. The table is allowed to continue spinning for three minutes. After spinning the substrate is heat-cured in the usual manner.

This method produces a coating of insulation 5 to 6 microns thick having an extremely smooth surface. It is an improvement over the former method in which a substrate bearing PYRE-M.L. is retained in a Petri dish by glass slides while being spun at a much lower speed thus producing an insulated surface that was not sufficiently smooth for use without a silicon monoxide overlay. *Trademark of
E. I. du Pont de Nemours & Co.

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