Abstract: A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 .mu.m, provided further that the number average ratio of particles smaller than 53 .mu.m is greater than 80%, the remaining larger particles being in the size range from 53 .mu.m to 180 .mu.m. A powder with slow recrystallization rates, as evidenced by non-overlapping or slightly overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10.degree. C. to 20.

Abstract: A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 .mu.m, provided further that the number average ratio of particles smaller than 53 .mu.m is greater than 80%, the remaining larger particles being in the size range from 53 .mu.m to 180 .mu.m. A powder with slow recrystallization rates, as evidenced by non-overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10.degree. C. to 20.degree. C.

Abstract: A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 .mu.m, provided further that the number average ratio of particles smaller than 53 .mu.m is greater than 80%, the remaining larger particles being in the size range from 53 .mu.m to 180 .mu.m. A powder with slow recrystallization rates, as evidenced by non-overlapping or slightly overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10.degree. C. to 20.

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, NiMoO.sub.4, Ni.sub.2 O.sub.3, Ni.sub.3 (PO.sub.4).sub.2, nickel metal, nickel formate, and nickel oxalate and (B) at least one vanadium compound selected from the group consisting of LaVO.sub.4, Na.sub.3 VO.sub.4, VB.sub.2, VN, V.sub.2 O.sub.3 and vanadium metal. 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, except for vanadium metal. 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 NiI.sub.2, NiMoO.sub.4, NiO and nickel dimethylglyoxime and (B) at least one aluminum compound selected from the group consisting of Al.sub.2 (MoO.sub.4).sub.3, .alpha.-Al.sub.2 O.sub.3, Al.sub.2 (WO.sub.4).sub.3, ammonium-6-molybdoaluminate (III), and aluminum salicylate. Substantial smoke retardation is also obtained by including the above nickel compounds or aluminum compounds individually or aluminum ammonium sulfate, aluminum potassium sulfate, or aluminum acetylacetonate 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 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 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 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 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: A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 ?m, provided further that the number average ratio of particles smaller than 53 ?m is greater than 80%, the remaining larger particles being in the size range from 53 ?m to 180 ?m. A powder with slow recrystallization rates, as evidenced by non-overlapping or slightly overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10° C. to 20° C.