(US4739018-A)      New polycarbon sulphide cpd. consisting of units of formula (RxCSm)n of basic structure (I). In the formula, R is Li, Na, K, Ag, Cu, Zn or Co. x is the degree to which R is present in the C-S structure, having value 0-m/valency of R. m is 0-1, n is number of units in the polymeric C chain. Pref. x is greater than 0.5.    USE/ADVANTAGE -   In prodn. of electrodes, esp. for prim. or sec. generator cells and also in recovery of transition metals from dil. solns. esp. aq. effluents. The cpd. is obtd. in linear form at moderate cost and at lower temps. (6pp)n    (US4742127-A)      Polycarbon sulphide cpds. contg. units -(RxCSm)n- are produced by reacting up to 350 deg. C a reduced polycarbon cpd. consisting of linear chains of units -(CM)z- with S, an organic polysulphide, an alkali metal sulphide or sulphur halides. In the formulae R is H or M; x is 0-m; m is greater than 0 and not more tahn 1; n is the No. of units in the chain. M is Li, Na, K, Ag, Cu, Zn or Co; z is the no. of M present in the chain.    The reaction temp. is pref. 150-200 deg. C. A molar excess of S is used relative to -(CM)z-. The reaction is carried out in presence of a catalyst, esp. naphthalene, triphenylene, benz(a) or (e) pyrene, phenanthrene, pyrene, benz(a) anthracene, (9,10-Me2) anthracene, acenaphthylene, fluoranthene or perylene. The reduced polymer is produced by reducing a halogenated polycarbon, esp. e.g. PTFE, with M.    USE/ADVANTAGE -   For the prodn. of electrodes of generators; linear superficial C-S complexes can be produced using less energy than previously. (7pp)u    (US4803249-A)      Linear sulphuretted carbon cpd. comprising a copolymer of formula ((CH)p(RxCSm)-p)n (I) is new, where the copolymer comprising the structural formula (II).    (In the formula, R is H, alkali metal, Ag, Zn, Co or Cu; x is O to m/valency of R; m is up to 1; p is 0-1 exclusive and n is the number of units (I) in the copolymer.). Pref. the cpd. comprises up to 25 wt.%.    USE/ADVANTAGE -   The sulphur can be fixed in the cpds. at lower temp.. The cpds. are esp. voltaic cells. The cpds. may also be used e.g. for recovery of transition metals from dil, solns, esp. industrial effluents. They have high degree of sulphur substitution and low equiv. mass. (5pp)