No clean flux composition and methods for use thereof
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United States of America Patent
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Jul 16, 2019
Grant Date -
Feb 15, 2018
app pub date -
Oct 24, 2017
filing date -
Dec 22, 2015
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Abstract
A flux formulation includes an activator and a protic solvent. The activator may be glutaric acid, levulinic acid, 2-ketobutyric acid, 2-oxovaleric acid, or mixtures thereof. Suitable protic solvents include alkanediol, alkoxy propanol and alkoxy ethanol. The flux formulation may be a no-clean flux formulation that may be used in the soldering of electronic circuit board assemblies, for example, in conjunction with a support fixture having a planar back surface that minimizes vibrations during processing that might otherwise cause misalignment between a chip and a substrate prior to solder reflow.
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