1. Field of the Invention
The invention is concerned with polymers in aqueous colloidal dispersion, i.e., latexes, which are stabilized by isothiouronium cations.
2. Description of the Prior Art
U.S. Pat. No. 3,123,636 describes thiuronium halides which are viscous oils that are soluble in water and are useful as insect attractants and bactericides. The patent states that the compounds when shaken in water cause foaming, thus illustrating surfactant properties.
U.S. Pat. No. 3,594,355 describes water-soluble isothiuronium salts of epihalohydrin polymers and copolymers. These water soluble salts are disclosed as highly useful as shrinkproofing agents for wool, as wet and dry strength paper additives, as flocculating agents, as cross-linkable coatings for textiles and as semipermeable membranes. There is no suggestion that any kind of latex can be prepared with the polymers.
U.S. Pat. No. 3,642,879 describes S-(vinylbenzyl)isothiouronium compounds in which the isothiouronium moiety has the formula ##STR1## These compounds are useful as pesticides for the control of various plant, insects, and fungal pests and are monomers which can be polymerized. A latex of a copolymer of one of these compounds with styrene and butadiene is described. Such latexes, however, are useful and stable only in acidic media over a narrow pH range.