Butadiene polymer compsn. for prodn. of moulded articles, esp. electrical, electronic and chemical appts., e.g. capacitors, transistors, connections, transformers, valves, pipe connections, pumps and tiles, consists of (1) 100 pts. wt. butadiene polymer having mainly the 1,2-consign., and contg. metal bonds, (2) 5-100 pts.wt. solid plasticiser, (3) 50-100 pts. wt. filler, and (4) 0.1-3.0 pts. wt. free radical initiator. Polymer (1) consists of butadiene polymer chains with the 1,2-consign., and metal carboxylate, the polymer chains consisting of 50, pref. 80% butadiene residues, and 50, esp. 20 comonomer residues and/or residues of other cpds. More than 50%, esp. 80% of the butadiene residues possess the 1,2-consign., and the polymer chains contg. the 1,2-consign. have a mol. wt. of 200-100,000. The ratio of metal bonds to butadiene units is 1/4-100. The polymer is easily moulded; cures without the formation of cracks to give non-tacky prodts. with excellent electrical props., e.g. dielectric dissipation factor, dielectric constant, and arcing resistance; and has good heat resistance, impact resistance, and chemical resistance.
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