PERMANENT FLUXING AGENT AND SOLDER-THROUGH CONFORMAL COATING

摘要

A flux and solder-through coating for electrical components or assemblies is produced by melting and applying a copolymer of ethylene and an organic acid, having a mol. wt. 2000-3000, density 0.93-0.95 and ethylene/acid ratio 40:975 - 160:825. The molten material may be treated with a solvent such as an aliphatic hydrocarbon (up to 30 pts. per pt. copolymer). The mixt. can be allowed to cool to the 'cloud point', heated until clearing occurs, chilled and stirred. Additional solvent may be added at room temp. to provide a predetermined viscosity. A polymerised terpene (up to 20 wt.% of the solids in the soln.) can also be added.