Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of NiCl.sub.2, NiCO.sub.3 NiMoO.sub.4, NiO, Ni.sub.2 O.sub.3, NiS, NiSO.sub.4, NiWO.sub.4, nickel citrate and nickel formate, and (B) at least one bismuth compound selected from the group consisting of BiBO.sub.3, Bi.sub.2 O.sub.3, Bi.sub.2 O.sub.2 CO.sub.3, and Bi.sub.2 S.sub.3. Substantial smoke retardation is also obtained by including the above nickel compounds or bismuth compounds individually or the following nickel compounds or bismuth compounds individually in the vinyl chloride or vinylidene chlorides polymer compositions: NiB.sub.2, NiCrO.sub.4, NiFe.sub.2 O.sub.4, NiI.sub.2, Ni.sub.3 (PO.sub.4).sub.2, Ni.sub.2 Si, NiSnO.sub.3, nickel acetylacetonate, BiI.sub.3, or BiPO.sub.4.3H.sub.2 O.

Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of NiCrO.sub.4, NiO and Ni.sub.3 (PO.sub.4).sub.2 and (B) at least one antimony compound selected from the group consisting of antimony metal, SbCl.sub.3, Sb.sub.2 S.sub.3, Sb.sub.2 (SO.sub.4).sub.3, sodium meta-antimonate and antimony triacetate. Substantial smoke retardation is also obtained by including the above nickel compounds or antimony compounds individually in the vinyl chloride or vinylidene chloride polymer compositions.

Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of NiSO.sub.4, nickel acetylacetonate, nickel formate and nickel oxalate, and (B) V.sub.2 O.sub.5. Substantial smoke retardation is also obtained by including the above nickel compounds or V.sub.2 O.sub.5 individually in the vinyl chloride or vinylidene chloride polymer compositions.

Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of NiCO.sub.3, NiO, Ni.sub.2 Si, NiS, and nickel stearate, and (B) at least one vanadium compound selected from the group consisting of NH.sub.4 VO.sub.3, Mg(VO.sub.3).sub.2, NaVO.sub.3, VOSO.sub.4, V.sub.2 O.sub.4, V.sub.2 O.sub.5 and vanadium oxyacetylacetonate. Substantial smoke retardation is also obtained by including the above nickel compounds or vanadium compounds individually in the vinyl chloride or vinylidene chloride polymer compositions. Hydrates of the additive compounds may also be used.

Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of NiCO.sub.3, NiCrO.sub.4, NiMoO.sub.4, NiO, NiSO.sub.4, NiSnO.sub.3 and nickel stearate and (B) at least one copper compound selected from the group consisting of CuI, CuO, CuSCN, and 2-aminothiophenol Cu(I). Substantial smoke retardation is also obtained by including the above nickel compounds or copper compounds individually in the vinyl chloride or vinylidene chloride polymer compositions.

Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of Ni(BO.sub.2).sub.2, Ni.sub.2 O.sub. 3, Ni.sub.3 (PO.sub.4).sub.2, nickel citrate, nickel oxalate and tetrakis(triphenyl phosphite)nickel, and (B) at least one aluminum compound selected from the group consisting of aluminum metal, .gamma.-Al.sub.2 O.sub.3, AlSb, aluminum zinc sulfate, basic aluminum acetate and sodium aluminum carbonate (dawsonite). Substantial smoke retardation is also obtained by including the above nickel compounds or aluminum compounds individually in the vinyl chloride or vinylidene chloride polymer compositions, except for tetrakis (triphenyl phosphite) nickel.

Abstract: Smoke retardant vinyl chloride and vinylidene chloride polymer compositions are obtained by including therein a synergistic mixture of (A) at least one nickel compound selected from the group consisting of NiCO.sub.3 and nickel citrate and (B) at least one zinc compound selected from the group consisting of ZnO and ZnTiO.sub.3. Substantial smoke retardation is also obtained by including the above nickel compounds or zinc compounds individually in the vinyl chloride or vinylidene chloride polymer compositions, except for ZnO.