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Solderable, Flame Retardant Wire Coating

IP.com Disclosure Number: IPCOM000085997D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Angelo, RW: AUTHOR [+3]

Abstract

A coating used on magnet size wire used in overflow wiring must have low flammability for reasons of product safety, yet at the same time be solderable to permit bonding of the wire to selected bond sites. The solderability requires that the application of heat degrades and melts or volatilizes the coating, whereas the low flammability requires that the application of heat will not cause degradation and volatilization of flammable gases. Retarded flammability is accomplished through the use of a formulation which would degrade and melt with heat, but which contains free radical generating reactive groups which interfere with flame propagation. A specific formulation used the following constituents: A bromine and phosphorus containing 3000 MW polyol.

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Solderable, Flame Retardant Wire Coating

A coating used on magnet size wire used in overflow wiring must have low flammability for reasons of product safety, yet at the same time be solderable to permit bonding of the wire to selected bond sites. The solderability requires that the application of heat degrades and melts or volatilizes the coating, whereas the low flammability requires that the application of heat will not cause degradation and volatilization of flammable gases. Retarded flammability is accomplished through the use of a formulation which would degrade and melt with heat, but which contains free radical generating reactive groups which interfere with flame propagation. A specific formulation used the following constituents: A bromine and phosphorus containing 3000 MW polyol. 31 - 35% A hydroyl terminated saturated polyester of adipic acid and ethylene glycol, avg. eq. wgt. 195. 9 - 12% A solid condensation product of bisphenol-A and epichlorohydrin, epoxy equ 1650 to 2050. 14 - 21% A phenol blocked toluene diisocyanate adduct. 35 - 43% Catalyst such as dibutyltin dilaurate. 0.1 - 2.0% Solvent cresylic acid and Aromatic 100. 20 - 40%.

The hydroxy terminated saturated polyester and the bromine and phosphorus containing polyol were placed in a reaction kettle in a suitable heating mantle. The solvent mixture of cresylic acid and Aromatic 100 are then added and heating and stirring are begun. Next, the epoxy resin and the phenol blocked toluene diisocy...