Browse Prior Art Database

Core Encapsulant Removal

IP.com Disclosure Number: IPCOM000076157D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Faigenbaum, MA: AUTHOR

Abstract

Excessively hardened EPON*/AROCHLOR** encapsulant may be chemically removed from a magnetic core memory module by subjecting the module successively to: soaking in ethyl acetate (1 hour; with periodic agitation), draining (5 minutes), rinsing in ethyl acetate flow (3 minutes), draining (5 minutes), and final air drying (8 hours). Advantages of ethyl acetate usage: 1) it does not react with other module materials (e.g. substrate phenolic, polyurethane wire insulation, polyethylene,...). 2) it dissolves the Epon/Arochlor, provided that the latter has not become excessively crosslinked. 3) it is easily removed after processing due to its high-vapor pressure and low-boiling point. 4) it should not hydrolyze or self-polymerize under processing conditions. 5) it is economically reclaimed for reuse by simple distillation.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Core Encapsulant Removal

Excessively hardened EPON*/AROCHLOR** encapsulant may be chemically removed from a magnetic core memory module by subjecting the module successively to: soaking in ethyl acetate (1 hour; with periodic agitation), draining (5 minutes), rinsing in ethyl acetate flow (3 minutes), draining (5 minutes), and final air drying (8 hours). Advantages of ethyl acetate usage: 1) it does not react with other module materials (e.g. substrate phenolic, polyurethane wire insulation, polyethylene,...). 2) it dissolves the Epon/Arochlor, provided that the latter has not become excessively crosslinked. 3) it is easily removed after processing due to its high-vapor pressure and low-boiling point. 4) it should not hydrolyze or self-polymerize under processing conditions. 5) it is economically reclaimed for reuse by simple distillation. * Trademark Shell Chemical Co. ** Trademark Monsanto Co.

1