Browse Prior Art Database

Core Encapsulation Method

IP.com Disclosure Number: IPCOM000077879D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Calley, GE: AUTHOR [+4]

Abstract

Effective encapsulation of magnetic cores, with requisite properties (e.g. damping of magnetostrictive ringing) is achieved by coating the cores with a detackified mixture of uncured butyl rubber. The use of a detackifying agent in the mixture prior to coating simplifies the coating procedure, by eliminating handling of the tacky ingredient. During drying of the coating the detackifying agent bleeds to the surface, leaving the rubber constituent adjacent the cores.

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Core Encapsulation Method

Effective encapsulation of magnetic cores, with requisite properties (e.g. damping of magnetostrictive ringing) is achieved by coating the cores with a detackified mixture of uncured butyl rubber.

The use of a detackifying agent in the mixture prior to coating simplifies the coating procedure, by eliminating handling of the tacky ingredient. During drying of the coating the detackifying agent bleeds to the surface, leaving the rubber constituent adjacent the cores.

A suitable mixture for this purpose is 808 (uncured) butyl rubber HT10- 66*/208 tributoxyethyl phosphate. The mixture is prepared from a 3%(w/w) solution of butyl rubber in perchlorethylene ("as received") and a 15%(w/w) solution of tributoxyethyl phosphate in perchloroethylene in a ratio of 12:1.

Other materials subject to use as detackifying agents and applied as above with increasing difficulty, include: waxes (e.g. paraffin, carnauba, ceresin) and oils (e.g. tung oil). Other phosphate esters (e.g. methylphosphate) may be used as detackifying agent. * Product of Enjay Chemical Company.

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