Method for preparing emulsion resin composition for cationic electrodeposition paint
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United States of America Patent
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Jan 20, 2015
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Feb 27, 2013
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Feb 28, 2012
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Abstract
The present invention is a method for preparing an emulsion resin composition for a cationic electrodeposition paint, which reduces or eliminates time for desolvation. The emulsion resin composition for cationic electrodeposition paint includes a cationic epoxy resin and a blocked isocyanate curing agent. The method features the steps of: (1) a step of mixing water and the cationic resin to form a W/O emulsion, (2) a step of mixing the blocked isocyanate curing agent and the W/O emulsion to form a curing agent-containing W/O emulsion, and (3) a step of mixing water and the curing agent-containing W/O emulsion to form an O/W emulsion, via a phase inversion point from W/O emulsion to O/W emulsion. The method features a solid concentration by mass Xw/o (%) of the curing agent-containing W/O emulsion and a solid content by mass Xtra (%) at the phase inversion point from W/O emulsion to O/W emulsion satisfying a relation of Xw/o−Xtra>3%.
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