Denka Company Limited

Sachiyo Kishi

Hiroyuki Yashima

Yuhei Ishigaki

Hidehiro Matsuda

Kunihiko Otsuka

Provided are a chloroprene rubber that is less adhesive to rolls and gives a vulcanized product superior in physical properties, a production method thereof, a chloroprene rubber composition and a vulcanized product thereof. A chloroprene rubber comprising a steroid skeleton-containing compound. The chloroprene rubber may contain a steroid skeleton-containing compound in an amount of 0.01 to 1 mass %. A vulcanized product is prepared by vulcanizing a composition containing the chloroprene rubber. The chloroprene rubber can be prepared, for example, by emulsion-polymerizing chloroprene alone or chloroprene and other monomers in combination in the presence of a rosin containing a steroid skeleton-containing compound.

Chloroprene rubber, method for producing same, chloroprene rubber composition and vulcanized product of chloroprene rubber composition

An object of the invention is to provide a chloroprene polymer composition resistant to discoloration under heat or light. Provided is a chloroprene rubber composition, prepared by carrying out emulsion polymerization in the presence of 0.5 to 7.0 parts by mass of a rosin acid salt as emulsifier and terminating the emulsion polymerization by addition of a polymerization inhibitor and a phosphorus- or phenol-based compound as antioxidant. It is possible according to the invention to obtain a chloroprene polymer composition superior in discoloration resistance under heat or light. The chloroprene polymer composition according to the present invention can be used favorably for adhesion of cloths, leathers, foamed sheets, papers, woods, shoe parts, and others.

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Itoigawa, Japan

Sachiyo Kishi