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, NiCl.sub.2, NiO, NiS and nickel acetylacetonate and (B) at least one zinc compound selected from the group consisting of ZnCO.sub.3, ZnCrO.sub.4, ZnMoO.sub.4, Zn.sub.3 (PO.sub.4).sub.2, Zn.sub.2 SiO.sub.4, ZnSO.sub.4, ZnTiO.sub.3, Zn.sub.2 ZrO.sub.4, zinc ammonium sulfate, zinc borate, zinc acetylacetonate, zinc formate, zinc oxalate, and M.sub.2.sub.-2x Zn.sub.3.sub.+x [Fe(CN).sub.6 ].sub.2.yH.sub.2 O wherein M is an alkali metal, x is from 0 to 1, and y is from 0 to 4. Substantial smoke retardation is also obtained by including the above nickel compound or zinc compounds individually in the vinyl chloride or vinylidene chloride polymer compositions.

Abstract: A propylene oxide slurry polymerization process having high catalyst efficiency comprises (A) homopolymerizing or copolymerizing propylene oxide in isobutane in the presence of a catalyst substantially soluble in isobutane, (B) separating isobutane with catalyst dissolved therein from propylene oxide polymer, and (C) recycling isobutane and dissolved catalyst for further polymerization. The catalyst comprises (1) at least one trialkylaluminum compound wherein each alkyl group contains from 2 to 10 carbon atoms, (2) at least one diketone containing from 5 to 20 carbon atoms and (3) water. The catalyst may also contain (4) at least one dialkyl ether or cycloalkyl ether containing from 2 to 12 carbon atoms and/or (5) at least one ether alcohol containing from 2 to 12 carbon atoms.

Abstract: Dark colored impurities, 2-aminonaphthalene and 2-naphthol are extracted from crude N,N'-di-2-naphthyl-p-phenylenediamine by contacting with a mixed solvent system comprising (A) at least one compound selected from the group consisting of alkanols and alkanediols and (B) at least one alkylated benzene.