Abstract: Polychloroprene latexes, well suited for the production of adhesives, are prepared by (co)polymerizing chloroprene, in aqueous emulsion, in the presence of a free-radical initiator and at least one emulsifying agent, said aqueous emulsion further comprising (a) at least one non-carboxylic ionic surfactant and (b) at least two nonionic surfactants, the HLB values thereof differing by at least 3 units.

Abstract: A polychloroprene of sol type, the latices and solutions of which are gel free, exhibit improved rheological and other properties and are useful in the formulation of adhesive compositions, is readily prepared by polymerizing chloroprene in aqueous emulsion in the presence of X and Y chain transfer agents, said X chain transfer agent being present upon initiation of the polymerization and having a relative reaction velocity greater than that of chloroprene, and said Y chain transfer agent being incrementally or continuously added to the polymerization reaction medium over the course of the polymerization reaction and having a relative reaction velocity essentially the same as that of chloroprene.

Abstract: Chloroprene is polymerized in an alkaline aqueous emulsion, containing a sulfonamide. The presence of the sulfonamide provides polychloroprene latices which are stabilized against aging.

Abstract: Sulfur-modified polychloroprene in alkaline aqueous emulsion is prepared by incorporating one or more organic polysulfides which act as peptizing agents during the polymerization of the chloroprene. The sulfur-modified polychloroprenes obtained have stable viscosities.

Abstract: Homogeneous free-running powders, mixable when dry and with a mean particle size of between 0.1 and 5 mm, are obtained by high-temperature flocculation in the presence of aluminum polyhydroxychloride salts. The temperature is preferably between 70.degree. and 100.degree. C. and the pH is preferably 6 to 13.

Abstract: A process for instantaneous peptization of polychloroprene latexes made by polymerizing in the presence of sulfur and a modifying agent such as iodoform or a dialkylxanthogen disulfide, by adding a suitable thiol at a pH at least equal to 9.

Abstract: Sulfur-modified polychloroprene in alkaline aqueous emulsion is prepared by incorporating one or more organic polysulfides which act as peptizing agents during the polymerization of the chloroprene. The sulfur-modified polychloroprenes obtained have stable viscosities.