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Release Agent Method for Artwork Glass

IP.com Disclosure Number: IPCOM000085305D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Gibney, JT: AUTHOR [+3]

Abstract

Dry film photoresist utilized in image transfer processing of miniaturized electronics has a known tendency to adhere to emulsions on artwork glass when exposed to light. Therefore, in order to prevent adhesion, the emulsion interfaces of the artwork glass are covered with chemically removable release agent films, as illustrated, to effectuate release.

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Release Agent Method for Artwork Glass

Dry film photoresist utilized in image transfer processing of miniaturized electronics has a known tendency to adhere to emulsions on artwork glass when exposed to light. Therefore, in order to prevent adhesion, the emulsion interfaces of the artwork glass are covered with chemically removable release agent films, as illustrated, to effectuate release.

A problem in this respect is that many release agents have either poor release properties or poor optical properties; the latter tending to distort the transferred image by refraction and attenuation. Ideally the release agent should be inert, durable, easily removable and completely transparent and free of distortion relative to the ultraviolet radiation used in the transfer process.

A release agent which approaches this ideal is composed of a 1/2% solution of paraffin and heptane applied to the emulsion interface side of the artwork glass in a thin film, using an applicator suitable for obtaining uniform coverage. The heptane constituent is allowed to evaporate leaving a monolayer of paraffin over the glass surface. This layer allows intimate contact between the artwork emulsion on the glass and the photoresist mask, and has the requisite optical properties for transferring a sharp well-defined image. The paraffin layer provides a durable surface coating which is readily removable with a solution of heptane and 1,1,2 trichloro-1,2,2 + rifluoroethane which is a commercially m...