Abstract: Disclosed are novel organic pigments adapted particularly for use as tillers for paper. The organic pigments are finely divided particles obtained by graft copolymerizing an ethylenically unsaturated monomer, such as styrene, onto a water-soluble cationic prepolymer in an aqueous solution and in the presence of a free-radical polymerization initiator.

Abstract: The present invention relates to production of vinyl halide-polyolefin graft copolymers by a liquid phase bulk polymerization process wherein the process is carried out in the presence of a diluent. Suitable diluents preferably have vaporization pressure characteristics, within 100 psi., and similar liquid state viscosity, as vinyl halide monomer. The diluents are soluble in vinyl halide monomer under reaction conditions and are inert to the polymerization mass. The diluents are straight or branched chain, or cyclic saturated hydrocarbons having from about 3 to about 15 carbon atoms and, more preferably, from about 4 to about 8 carbon atoms. Particularly useful diluents are n-propane, n-butane, isobutane or mixtures thereof. The diluents are utilized in amounts from about 0.2 to less than about 50.0 percent based upon the total weight of the reaction charge.

Abstract: A latex of vinylidene chloride copolymer particle which has a three-layered structure comprising 20 to 70 parts by weight of a core layer of vinylidene chloride copolymer containing 85 to 94% by weight of vinylidene chloride, 3 to 15 parts by weight of an intermediate layer of vinylidene chloride copolymer containing more than 94% by weight of vinylidene chloride and 20 to 70 parts by weight of an outer layer of vinylidene chloride copolymer containing 85 to 94% by weight of vinylidene chloride, the three layers amounting to 100 parts by weight.

Abstract: A process for producing expandable thermoplastic resin beads which comprises suspending in an aqueous medium 20 to 70% by weight of a random copolymer of propylene and ethylene containing 1 to 10% by weight of ethylene and 99 to 90% by weight of propylene and 30 to 80% by weight of a vinyl aromatic monomer such as styrene, polymerizing the vinyl aromatic monomer in the presence of a polymerization catalyst to graft the vinyl aromatic monomer onto the backbone of the random copolymer and, optionally, adding a cross-linking agent, to form graft-copolymerized thermoplastic resin beads, and introducing a blowing agent into the thermoplastic resin beads. The resulting resin beads have excellent foamability and molding fusability, and a foamed shaped article having superior thermal stability can be prepared from these beads.

Abstract: Disclosed are novel organic pigments adapted particularly for use as fillers for paper. The organic pigments are finely divided particles obtained by graft copolymerizing an ethylenically unsaturated monomer, such as styrene, onto a water-soluble cationic prepolymer in an aqueous solution and in the presence of a free-radical polymerization initiator.

Abstract: Disclosed are novel organic pigments adapted particularly for use as fillers for paper. The organic pigments are finely divided particles obtained by graft copolymerizing an ethylenically unsaturated monomer, such as styrene, onto a water-soluble cationic prepolymer in an aqueous solution and in the presence of a free-radical polymerization initiator.

Abstract: A process for the continuous preparation of vinyl chloride polymers containing at least 85 weight percent of polymerized vinyl chloride units in an aqueous emulsion in the presence of at least one water soluble catalyst and 1.5 to 3.5 weight percent (calculated on the monomer(s)) of at least one water soluble salt of an aliphatic, saturated monocarboxylic acid having the formula ##STR1## wherein R.sub.1 and R.sub.2 are equal or different each representing a saturated, branched or unbranched alkyl radical having 1 to 5 carbon atoms or of at least one of said water soluble salt in mixture together with at least one known emulsifier being an organic compound containing sulfonic acid-groups. The resulting polymers show an equally excellent thermostability in mixture with one of a multiplicity of known stabilizers especially of the lead-, tin- or barium/cadmium type.

Abstract: Disclosed are novel organic pigments adapted particularly for use as fillers for paper. The organic pigments are finely divided particles obtained by graft copolymerizing an ethylenically unsaturated monomer, such as styrene, onto a water-soluble cationic prepolymer in an aqueous solution and in the presence of a free-radical polymerization initiator.

Abstract: A dry grafting method of grafting a vinyl monomer onto a polymer, which method comprises admixing into an essentially dry, solvent-swollen, finely-divided, particulate, solid, polymer admixture, wherein the polymer has free radicals formed thereon and the admixture is essentially free of a polymerization initiator, a small grafting amount in incremental portions of a vinyl-monomer material to be grafted onto the swollen polymer, the amount of vinyl monomer sufficient to maintain an essentially free-flow, stirrable, particulate admixture, and effecting grafting of the vinyl monomer to the polymer.

Abstract: Dispersions of high molecular weight, essentially non-polymerizable vinyl resins in mixtures of radiation curable monofunctional and polyfunctional acrylyl monomers and/or oligomers. The dispersions are useful as coating and ink compositions.

Abstract: A method for preparing polymers of vinyl chloride in which polymerization of the corresponding monomer or monomers is carried out in microsuspension in the presence of a seeding product in the form of a dispersion of particles of a vinyl polymer previously prepared by polymerization in microsuspension, the particles of which contain at least one organic soluble initiator, without any complementary addition of initiator and in the presence of one or more other seeding products in the form of dispersion of vinyl polymer, the sizes of which differ from one another and from the particles of the first seeding product.

Abstract: Disclosed are novel organic pigments adapted particularly for use as fillers for paper. The organic pigments are finely divided particles obtained by graft copolymerizing an ethylenically unsaturated monomer, such as styrene, onto a watersoluble cationic prepolymer in an aqueous solution and in the presence of a free-radical polymerization initiator.

Abstract: Normally flammable halohydrocarbon polymer compositions containing combustible plasticizer are rendered flame-retardant or self-extinguishing by incorporating therein elemental phosphorus having a specific gravity greater than two.

Abstract: Polymers of excellent impact strength, reduced particle size, and enhanced proportions of fines are obtained in the bulk polymerization of a vinyl halide or mixture thereof with comonomer(s) in the presence of a high molecular weight polyolefin added to the polymerization mass upon conversion of 0 to about 20% by weight of monomer(s) to polymer, by removing from the polymerization mass during the thick paste state thereof sufficient vinyl halide to adjust the effective concentration of polyolefin to above about 3.5% based on vinyl halide. The resultant product which contains an enhanced proportion of fines and is devoid of massive agglomerates, requires less mechanical work in comminution or shorter heating in melting in subsequent conventional processing steps.

Abstract: Vinyl chloride resin composition comprising vinyl chloride series resin and a two stage polymerization product comprising methyl methacrylate or a monomeric mixture containing a major proportion of methyl methyacrylate subjected to emulsion polymerization and then in the presence of the resulting rigid thermoplastic phase an elastomer phase is formed onto the surface of the rigid thermoplastic phase by polymerizing a monomeric mixture containing a major proportion of an acrylic acid ester and/or a methacrylic acid ester, esclusive of methyl methacrylate.

Abstract: Crosslinked vinylidene chloride polymer microgel powders are recovered from a latex obtained by emulsion polymerizing in sequence (a) a first monomer mixture comprising a predominant amount of vinylidene chloride, an ethylenically unsaturated comonomer, and a crosslinking polyfunctional monomer; (b) a minor amount of a polyfunctional monomer for providing graft sites on the product of (a); and (c) a second monomer mixture which is predominantly acrylonitrile, the amount of the second monomer mixture being in the range of about 10 to 25 percent of the weight of the first monomer mixture. The so-formed microgels, having a particle size less than about 1 micron, are admixed with an acrylic polymer and a suitable solvent and then spun into fibers having improved flame-retardancy.