Denki Kagaku Kogyo Kabushiki Kaisha

Michio Dohi

Takashi Kadowaki

Yasuaki Denda

Katsuichi Yokobori

Takuji Sumida

Chloroprene or a mixture of chloroprene and a comonomer is polymerized by emulsion polymerization in the presence of an alkali metal or ammonium salt of an aliphatic substituted benzoic acid or a non-ionic polyoxyethylene ether or ester surfactant. The resulting chloroprene polymer is admixed with a solvent, a metal oxide and a thermosettable resin, e.g., an alkylphenol-formaldehyde resin to yield a non-phasing adhesive composition.

Non-phasing chloroprene polymer adhesive composition and preparation

A process for producing a chloroprene elastomer, which comprises copolymerizing in the presence of a radical catalyst 80 to 95 parts by weight of 2-chlorobutadiene-1,3 containing less than 0.95% by weight of 1-chlorobutadiene-1,3 with 5 to 20 parts by weight of 2,3-dichlorobutadiene-1,3 at a polymerization temperature of not higher than 20.degree. C in the presence of a mercaptan compound and a process for producing a vulcanized chloroprene rubber.

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Omi, Japan

Michio Dohi