| 摘要 |
A flameproofed plastic composition comprises a readily flammable synthetic resin and a brominated butadiene or isoprene polymer of polymerization degree of 2 to 2,000 in amount such that the bromine content of the composition is from 0,5 to 6% based on the resin. Specified resins are polymers and copolymers of ethylene, propylene, acrylonitrile, acrylic acid esters, methacrylic and esters, vinyl acetate, unsaturated polyester resins, polystyrene and copolymers of styrene with acrylonitrile. Expandable resin compositions such as bead-like styrene polymers containing readily volatile hydrocarbons. Specified brominated polymers are hexadecane tetraene, cyclodecatriene, vinyl cyclohexene which have been brominated, and hexabromocyclododecane, octabromohexadecane, brominated butadiene polymers, and brominated degraded natural rubber. The composition may be made by mixing the resin and bromide compound, or dissolving them in a solvent and subsequently removing it, or by adding the bromine compound prior to polymerization of the monomer, this latter method being especially suitable for the production of bead-like expandable styrene polymers.ALSO:A flame-proofed plastic composition comprises readily flammable expandable synthetic resin and a brominated butadiene or isoprene polymer of polymerisation degree of 2 to 2000 in amount such that the bromine content of the composition is from 0,5 to 6% based on the resin. Specified resins are polystyrene, polymethylmethacrylate and a styrene of acrylonitrilevinyl carbazole terpolymer. The bromine compound may be added to the preformed resin or to its monomer before polymerization. Specified bromine compounds are hexabromocyclododecane, octabromohexadecane, brominated butadiene polymers of polymerization degree 250 to 300, and of 50 to 100, brominated degraded natural rubber, and brominated hexodecane-tetraene, cyclodecatriene, and vinyl cyclohexene. In Examples 3 styrene is polymerized in aqueous emulsion in the presence of catalyst benzoyl peroxide and expanding agent pentane with octabromohexadecane as flame-proofing agent; the polymer is expanded by heating in steam or boiling water 4 a vinyl carbazole styrene-acrylonitrile mixture is polymerised in water in the presence of hexabromo-cyclododecane, benzoyl peroxide and pentane and the product expanded by heating with steam 5 styrene is polymerized to an expandable plastic in the presence of polystyrene, brominated polybutadiene (250-300), pentane and benzoyl peroxide 6 expanded polystyrene is prepared by polymerizing styrene, a little divinyl benzene, brominated polybutadiene (50-100), dichlorodifluoromethane and azodiso-butyronitrile, 7 methylmethacrylate is polymerized in the presence of benzoyl peroxide, pentane and brominated cyclododecantriene 8 polystyrene-brominated natural rubber mixture is treated under pressure with water and petroleum ether 9 expandable polystyrene beads containing pentane are coated with brominated cyclododecantriene 10 as for 9 using also cyclohexane 11, 12 and 13 expandable polystyrene is produced as in the previous examples. |
