Invention Application
US20150152209A1 POLYCHLOROPRENE LATEX, POLYCHLOROPRENE LATEX COMPOSITION, AND MOLDED ARTICLE 有权
聚氯乙烯,聚氯乙烯组合物和成型品

POLYCHLOROPRENE LATEX, POLYCHLOROPRENE LATEX COMPOSITION, AND MOLDED ARTICLE
Abstract:
An object of the present invention is to provide a polychloroprene latex with improved rubber coagulability that gives a film superior in strength by dip molding, a polychloroprene latex composition, and a molded article. The polychloroprene latex is prepared by polymerization of 2-chloro-1,3-butadiene alone or by polymerization of raw monomers at least containing 2-chloro-1,3-butadiene and 2,3-dichloro1,3-butadiene and has a precipitation rate of 5 to 40%, as calculated according to Equation (I). In Equation (I), A is the mass (g) of the dry product, which is obtained by adding 50 ml of saturated aqueous solution of calcium hydroxide at 23° C. to 50 g of a latex having a solid matter concentration adjusted to 45 to 65 mass % at a liquid temperature of 23° C. over 2 minutes, filtering and collecting the generated precipitate with a 80-mesh wire mesh, and drying the precipitate at 110° C. for 3 hours; B is the mass of the latex before the dropwise addition (50 g); and C is the solid matter concentration (mass %) of the latex before the dropwise addition. Precipitation   rate   ( % ) = A B × C 100 × 100 ( I )
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