FLUX COMPOSITION FOR CREAM SOLDER AND CREAM SOLDER

PROBLEM TO BE SOLVED: To obtain a flux compsn. and cream solder which have high activity, good solubility in a flux and have lowered hygroscopicity by incorporating a rosin derivative having primary carboxyl groups and a flux having the solubility in water of a specific value or below at room temp....

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA YASUHISA, AKIE HITOSHI, YOSHITOMI MANABU, NARITA KATSUHIKO, KAKU YOSHIHIRO, TANAKA TAKASHI, KOJIMA HIROMITSU
Format:	Patent
Sprache:	eng
Schlagworte:	CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY MACHINE TOOLS MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PRINTED CIRCUITS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a flux compsn. and cream solder which have high activity, good solubility in a flux and have lowered hygroscopicity by incorporating a rosin derivative having primary carboxyl groups and a flux having the solubility in water of a specific value or below at room temp. into the compsn. and solder. SOLUTION: The rosin deriv. having the primary carboxyl groups is obtd. by a method, etc., of bringing known rosins or their derivatives and a primary carboxyl group-contg. hydroxy compd., more preferably glycolic acid into esterification reaction. Any fluxes which have the low hygroscopicity of =150 deg.C is preferable. The flux described above is preferably incorporated into the flux compsn. at >=50wt.% of the entire part of the flux.