Abstract: Flame-retardant thermoplastic materials are prepared from polymers and copolymers of styrene, organic halogen compounds and compounds synergistic with the halogen compounds. These synergistic compounds contain heterocyclic amide or imide groups linked by a labile --C--C-- linkage.

Abstract: 2,2-Bis(4-allyloxy-3,5-dibromophenyl)-propane is used as a flame-retardant synergist for polystyrene.

Abstract: A process for the preparation of acetylene copolymers by catalytic polymerization of a mixture of acetylene and dialkynes or polyalkynes, using Ziegler catalysts. The novel polymers may be used as colored pigments, as colored coatings for metal, glass or plastics, and for the production of electrical or magnetic components.

Abstract: Particulate expandable styrene polymers which contain an organic bromine compound as the flameproofing agent and an organic compound possessing a labile C--C, O--O or N.dbd.N bond as the synergistic agent for flameproofing. The flameproofing agent is applied to the surface of the particles while the synergistic agent is homogeneously incorporated into the particles.The polymers can be converted to self-extinguishing foams.

Abstract: Thermoplastic molding compositions based on rubber-modified styrene-acrylonitrile copolymers containing a halogenated styrene oligomer as the effective flame-proofing agent which is sufficiently heat-stable, does not interfere with processing on conventional machinery, does not corrode or cause coatings on such machinery, and has virtually no adverse effect on the impact strength of the polymers. The flameproofing agent as a rule has a degree of polymerization of from 3 to 200 and can be incorporated into the polymer by conventional methods; the polymer may or may not contain additional synergistic agents and processing auxiliaries, which are incorporated in the conventional manner and in the conventional amounts.

Abstract: A flameproof thermoplastic molding material based on a styrene polymer and containing from 0.05 to 5 percent by weight of an organic bromine compound as the flameproofing agent, with or without a blowing agent, wherein the bromine compound contains a heterocyclic ring, comprising the group ##STR1## IN ITS MOLECULE, AND IS HEAT-STABLE UP TO AT LEAST 150.degree. C. The preferred bromine compound has the formula ##STR2## The molding materials may be used for the manufacture of self-extinguishing moldings, eg. foam moldings.

Abstract: New compounds containing tribromomethyl groups, of the general formula ##STR1## WHEREIN X is chlorine or bromine, R is hydrogen or methyl and R.sup.1 is hydrogen or a group of the formula --COO--CHX--CBr.sub.3 and a process for their preparation. The compounds may be used for the manufacture of homopolymers or copolymers which find diverse uses, eg. for the manufacture of moldings, coatings or adhesives. The compounds are manufactured by reacting the corresponding acid chlorides or acid bromides with equivalent amounts of tribromoacetaldehyde. The acid chlorides and bromides have the formula ##STR2## wherein X is chlorine or bromine, R is hydrogen or methyl and R.sup.2 is hydrogen or --COX. The reaction is carried out in the presence of from 0.1 to 10 per cent by weight of a Lewis acid, preferably AlBr.sub.3 or FeBr.sub.3, at from 0 to 80.degree. C., generally with reaction times of from 1 to 10 hours, preferably from 2 to 3 hours.

Abstract: Fibers and filaments of linear thermoplastic polyesters, containing halogen-containing flameproofing agents and synergistic agents therefor, in which the flameproofing agents are chlorinated and/or brominated oligomeric styrenes. The fibers and filaments of the invention are used for the manufacture of textiles of low flammability.

Abstract: Styrene polymers or copolymers containing bromine are manufactured by cationic polymerization of the monomer, or of the monomer plus a copolymerizable monomer of the isobutylene or nuclear-alkylated styrene type, in an organic solvent in the presence of a Lewis acid catalyst. Bromine is then added to the solution without first working up the latter. The catalyst used for the bromination is the same as that used for the polymerization. If necessary, fresh catalyst may be added before the bromination. After completion of the bromination the reaction solution is extracted with water until it is bromide-free, and the solvent, generally a halohydrocarbon, is then stripped off. Products containing up to about 80% by weight of bromine may be obtained. They have a pale yellowish color and exhibit no significant decomposition up to 340.degree. C. They may be used as flame-proofing agents for thermoplastics.

Abstract: A flameproofed nylon molding composition which can be processed by thermoplastic methods and which contains, as the flameproofing agent, from 5 to 30% by weight of brominated styrene oligomers and a synergistic metal oxide. The compositions may be used for the manufacture of injection moldings for the electrical industry.

Abstract: Flame-proofed linear polyesters containing, as flame-proofing agents, halogenated oligomeric styrenes and synergistic compounds.

Abstract: Particulate expandable styrene polymers which contain from 0.0001 to 0.2% by weight, based on the styrene polymer, of an inhomogeneously distributed nucleating agent for expandable polystyrene, the nucleating agent being present only in a peripheral zone of the particles while the interior of the particles is free from nucleating agent. Nucleating agents which may be used are organic compounds having at least three bromine atoms, bonded to aliphatic or cycloaliphatic structures, in the molecule, or bromine compounds which are polymerizable, or are copolymerizable with styrene.

Abstract: A process for the manufacture of heat-stable, brominated oligostyrenes by brominating selectively hydrogenated oligostyrenes in halogenated solvents in the presence of Lewis acids at from -25.degree. to +20.degree. C. The brominated oligomers are highly heat-stable and can be processed, by themselves or as components of mixtures with other thermoplastics, to give various shaped articles.

Abstract: Thermoplastic molding compositions based on styrene polymers contain, as a flameproofing agent, an organic bromine compound of the general formula ##STR1## where X is a hydrocarbon radical and n is 0 or 1. The compositions may be used for the manufacture of self-extinguishing moldings, e.g. foams.

Abstract: Thermoplastic molding material based on styrene polymers and olefin polymers which have been flameproofed with an organic bromine compound. Brominated oligomers or polymers of dialkylbenzenes, trialkylbenzenes or tetraalkylbenzenes serve as flameproofing agents. The molding material may be processed into self-extinguishing moldings.