TWI778132B

Provided are a flux and a solder paste. Fluidity of the flux is prevented from deteriorating upon a reflow of the solder paste, thereby preventing a void from emerging within a solder connection portion and a solder bump which are being formed. Moreover, a missing bump is prevented from emerging whe...

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Bibliographische Detailangaben
Hauptverfasser:	SHIBASAKI, MASANORI, SAKAMOTO, ISAO, SUGIMOTO, JUN
Format:	Patent
Sprache:	chi
Schlagworte:	CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 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 METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PRINTED CIRCUITS SOLDERING OR UNSOLDERING THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	Provided are a flux and a solder paste. Fluidity of the flux is prevented from deteriorating upon a reflow of the solder paste, thereby preventing a void from emerging within a solder connection portion and a solder bump which are being formed. Moreover, a missing bump is prevented from emerging when the solder bump is formed. The flux is characterized by comprising a rosin-based resin, an activator, a thixotropic agent, and a solvent. Here, the solvent comprises a monovalent alcohol, wherein a number of carbon atoms included in one molecule is between 18 and 24. Also, a mixed amount of the monovalent alcohol is at least 30 mass% and at maximum 60 mass% with respect to the entire amount of the flux.