Abstract: A process for producing a cationic emulsion stable to alkalis having an average particle diameter of 0.01 to 0.1 micron, in which, using as an emulsifier, a water-soluble polymer A2 obtained by subjecting a polymer A1 obtained by copolymerizing an amino group-containing compound with a compound copolymerizable therewith in the presence of a polymerization initiator, to neutralization with an organic or inorganic acid, a specific epoxy group-containing acrylate compound (c) and a compound copolymerizable therewith are subjected in combination to emulsion polymerization in the presence of a redox catalyst system in water as a medium to obtain an emulsion D; the emulsion D is then reacted with epichlorohydrin. The cationic emulsion is coated on paper, a film, or a strongly alkaline substrate to impart water resistance.

Abstract: A process for producing a cationic emulsion stable to alkalis having an average particle diameter of 0.01 to 0.1 micron, in which using, as an emulsifier, a water-soluble polymer A2 obtained by subjecting a polymer A1 having a weight average molecular weight of 5,000 to 100,000 obtained by copolymerizing an amino group-containing compound with a compound copolymerizable therewith in the presence of a polymerization initiator, to neutralization with an organic or inorganic acid in a proportion of 0.5 to 1.