SULFUR MODIFIED CHLOROPRENE RUBBER AND METHOD FOR PRODUCING SAME, AND MOLDED BODY

摘要

Provided are: a sulfur modified chloroprene rubber that has excellent adhesiveness to core wires and reinforced fiber materials; a method for producing the same; and a molded body. A polymerization step of blending 0.1 to 2.0 parts by mass of sulfur into 100 parts by mass of a 2-chloro-1,3-butadiene and emulsion polymerizing the mixture until the monomer conversion rate is within the range of 60 to 90%, and a plasticization step of adding an aqueous medium dispersion containing 10 to 70 mass% of a tetramethylthiuram disulfide into the reaction liquid after polymerization and modifying the polymer end are performed to obtain a sulfur modified chloroprene rubber for which the 1H-NMR spectrum measured in a deuterated chloroform solvent shows peaks at 3.55 to 3.61 ppm and 3.41 to 3.47 ppm, and the ratio (A/B) of peak area (A) at 3.55 to 3.61 ppm to peak area (B) at 4.2 to 6.5 ppm is 0.05/100 to 0.70/100.