Emulsion polymerizations of several vinyl monomers, styrene, methyl methacrylate, butyl methacrylate, butyl acrylate, and vinyl acetate, in water using alkali-hydrolysable cationic surfactants with a betaine ester group, (1-alkoxycarbonylmethyl)trimethylammonium chlorides, as emulsifiers were carried out and properties of the resulting latices and the polymers recovered by hydrolysis and salting out were investigated. There were little influences of the surfactants and monomers used here on the polymerizations, forming stable and monodisperse latices with a mean diameter of ca. 70 nm and giving a high molecular weight of polymers at high yields. All polymers were precipitated and recovered by adding a small amount of sodium hydroxide into the latex solutions contained little amount of ionic species. Solvent-cast films of the polymers were found to have surfaces as hydrophobic as those for the corresponding pure polymers prepared by bulk polymerization.

Adsorption of polystyrene latices containing an alkali-hydrolysable cationic emulsifier on filter papers pretreated with sodium carbonate was examined. Hydrolysis of the emulsifiers synchronized with adsorption of the latices on the paper could fix, or coat, polystyrene on the paper surface rapidly and efficiently at room temperature, and little amounts of polymers were desorbed by rinsing. In contrast, a smaller amount of the latices were adsorbed on the surface of the nonpretreated paper and most of them were desorbed from the surface by rinsing. The polymer-coated paper surface gained both water resistance and ''quick drying.'' V

Surfaces of filter papers pretreated with sodium carbonate were coated with poly(methacrylate) latices containing alkali-hydrolysable or non-hydrolysable cationic emulsifiers by a simple drop-coating method and their surface properties were investigated.Determination of fixed amounts of polymers and observation of the paper surfaces suggest that glass transition temperature of the polymers and hydrolysability of the emulsifier are dominant factors for the coating. The latices of poly(2-ethylhexyl methacrylate) containing the hydrolysable emulsifier could coat the paper surface almost perfectly and smoothly, making it quick drying and water repellent.