WATER-DISPERSIBLE RESIN COMPOSITION AND PROCESS FOR PRODUCING THE SAME

摘要

A process for producing a water-dispersible resin composition comprising: the step of conducting free-radical polymerization of a starting mixture composed of: (a) 10-95 wt.% of a water-insoluble resin having a solubility in water of 1 or less and (b) 90-5 wt.% of a monomer mixture composed of (1) 2-75 wt.% of an ethylenically unsaturated acid monomer and (2) 98-25 wt.% of another ethylenically unsaturated monomer in the presence of a polymerization initiator, and the step of neutralizing the obtained acidic resin composition with a neutralizing agent. The obtained composition provides a coating composition which is improved in shelf stability and solid content, stable, and excellent in workability in coating. As well-dispersible resin particles serve to improve coating film uniformity, the coating film obtained from the composition is improved in transparency, smoothness, chemical and water resistances, and mechanical strength.