PURPOSE: To prepare a solvent-free synthetic resin aqueous dispersion useful as a binder and the like, which is able to yield a film having excellent durability and a solvent resistance by mixing a mixture of an ionic resin and an ethylenically unsaturated monomer with a specific type of polyisocyanate, and polymerizing the mixture under specific conditions.
CONSTITUTION: A mixture of an ionic resin, such as an amino-epoxy resin or the like, and at least one ethylenically unsaturated monomer, such as hydroxypropyl (meth)acrylate or the like, is mixed with a completely blocked polyisocyanate, such as phenylene diisocyanate or the like, wherein some of blocking groups contain an ethylenically unsaturated group, and is converted to an aqueous dispersion, followed by polymerization of all of the ethylenically unsaturated groups by emulsion polymerization to obtain the objective solvent- free synthetic resin aqueous dispersion. It is pref. that the dispersion should be used as a binder in a lead-free cationic electrodeposition bath.
MARUKUSU AA SHIYATSUFUHOITORE
AHIMU FUERUKERU
GERUTO UARUTSU
SUUZANEN UEENAA
PEETAA TSUIIGURERU
