Patent ID: 8883511

Claim:
A method for evaluating of the chemical stability of a polychloroprene latex, comprising the steps of: adding an aqueous calcium hydroxide or calcium nitrate solution at concentration of 0.05 to 0.40 mass % to a polychloroprene latex having a solid matter concentration of 45 to 65 mass %; collecting the generated precipitate by filtration and measuring the dry mass thereof; and, calculating the precipitation rate (%) according to the following Formula: Precipitation ⁢ ⁢ rate ⁢ ⁢ ( % ) = A { B × ( C ⁢ / ⁢ 100 ) } × 100 wherein A represents the dry mass of the precipitate (g); B represents the mass of the polychloroprene latex (g); and C represents the solid matter concentration of the polychloroprene latex (mass %), and wherein the chloroprene polymer in the polychloroprene latex has a toluene-insoluble matter of 70 to 99 mass %.