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US 4,360,144 AGranted
Printed circuit board soldering
AssigneeBASF Wyandotte Corporation
InventorsWilliam A. Cuddy, Basil Thir, Stephen E. Eisenstein
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AssigneeBASF Wyandotte Corporation
InventorsWilliam A. Cuddy, Basil Thir, Stephen E. Eisenstein
Estimating the term…
The present invention relates to a method of wave soldering an assembly composed of a plurality of electrical conductors disposed on a surface of a sheet of insulating material. In accordance with this method, the surface of the sheet and the conductors are contacted with a stationary wave of molten solder having a polyether admixed therewith and floating on the surface thereof. The polyether is a heteric or block copolymer of a dihydroxyphenol and at least one lower alkylene oxide. It is preferred that the alkylene oxide contain 2 to 4 carbon atoms. The alkylene oxide may be all ethylene oxide or may be a mixture with other lower alkylene oxides such as propylene oxides and butylene oxides. In any event, the copolymer should contain at least about 20 percent by weight of oxyethylene groups, balance oxypropylene groups and/or oxybutylene groups. A conventional polymeric oxidation inhibitor may also be included.
A method of wave soldering an assembly comprised of a plurality of electrical conductors disposed on a surface of a sheet of insulating material comprising contacting said surface of said sheet and said conductors with a stationary wave consisting essentially of molten solder and a polyether admixed therewith and floating on the surface thereof, said polyether being the heteric or block copolymer of a dihydroxyphenol and at least one lower alkylene oxide, said copolymer containing at least about 20 percent by weight oxyethylene groups.
In a method of wave soldering an assembly comprised of a plurality of electrical conductors disposed on a surface of a sheet of insulating material comprising contacting said surface of said sheet and said conductors with a stationary wave consisting essentially of molten solder and a polyether admixed therewith and floating on the surface thereof, the improvement for eliminating or substantially reducing fuming at elevated temperatures wherein said polyether is the heteric or block copolymer of a dihydroxyphenol and at least one lower alkylene oxide, said copolymer containing at least about 20 percent by weight oxyethylene groups.
Dependencies are inferred from the claim text.