AQUEOUS FLUORORESIN DISPERSION, ITS PRODUCTION AND WATER-BASED COATING COMPOSITION CONTAINING THE SAME AQUEOUS DISPERSION

摘要

PURPOSE:To obtain the subject dispersion excellent in film-forming properties under low-temperature drying conditions, durability and anti-fouling properties of films by carrying out emulsion polymerization of a monomer mixture consisting essentially of specific monomers in the presence of an aqueous resin dispersion having a specified composition. CONSTITUTION:The objective composition is obtained by initially copolymerizing (A) a fluoroolefin (preferably hexafluoropropylene, etc.) with (B) monomers (preferably vinyl esters such as vinyl acetate) copolymerizable with the component (A), providing an aqueous resin dispersion and then carrying out emulsion polymerization of (C) monomers consisting essentially of a fluoroalkyl group- containing ethylenic monomer [preferably fluoroalkyl group-containing (meth) acrylic acid esters such as octafluorobutyl methacrylate] in the presence of the resultant aqueous resin dispersion. The copolymerization of the components (A) with (B) is preferably performed under conditions of 30-90 deg.C and 6-50kg/cm2 according to an emulsion polymerization method.