FLUX AND SOLDER PASTE
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United States of America Patent
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Feb 7, 2017
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Apr 5, 2012
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Using flux to suppress increase in the viscosity of solder paste during its storage and also to improve the fusibility of a solder alloy. The flux, which contains an activator and a solvent, forms solder paste by being mixed with a granular solder alloy. The flux contains a monoalkyl propylene glycol-based solvent. It is preferable that the monoalkyl propylene glycol-based solvent is butyl propylene triglycol or butyl propylene diglycol. It is also preferable that the amount of monoalkyl propylene glycol-based solvent is equal to or more than 75 percent by mass but less than 100 percent by mass of the amount of all the solvents.
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