Patent GB-929652-A (GB)
Title: Flame-retardant cellular polymers of vinyl-aromatic compounds
Inventor: CROFT PETER WILLIAM
IPC: C08J9/22
Filed: 1960-06-16
Abstract: Expandable particles of a polymer of a vinylaromatic compound are treated with a plasticizer and rendered flame-retardant by coating with 10-50% by weight, based on the weight of the polymer, of a mixture of a highly halogenated non-volatile hydrocarbon and antimony oxide.  An internal flame-retardant agent, e.g. a triaryl phosphate, or tris-(2, 3-dibromopropyl) orthophosphate, may have been incorporated into the polymer particles.  The polymer particles contain a volatile expanding agent, and may be pre-expanded before treating and coating.  Specification 927,872 is referred to.ALSO:Expandable particles of a polymer of a vinyl-aromatic compound are treated with a plasticizer and rendered flame-retardant by coating with 10-50% by weight, based on the weight of the polymer, of a mixture of highly halogenated non-volatile hydrocarbon and antimony oxide.  Specified are polymers of styrene, a -methyl styrene, vinyl toluene and p-chlorostyrene, copolymers of these monomers, and copolymers of one or more of these monomers with a minor amount of a monomer such as acrylonitrile, methyl methacrylate, vinyl acetate, butadiene or isoprene: plastici5ers highly refined paraffinic or naphthenic oil, cetyl benzene, polydodecyl benzene, dibutyl or dioctyl phthalate, triphenyl phosphate, a tritolyl or trixenyl phosphate, tris-(2,3-dibromopropyl) orthophosphate and chlorinated diphenyl: and highly halogenated non-volatile hydrocarbons chlorinated paraffin waxes and chlorinated naphthalenes. An internal flame-retardant agent, e.g. a triaryl phosphate or tris-(2,3-dibromopropyl) orthophosphate, may have been incorporated into the polymer particles.  The polymer particles contain a volatile expanding agent to render them expandable. Specification 927,872 is referred to.ALSO:Expandable particles of a polymer of a vinyl-aromatic compound are treated with a plasticizer and rendered flame-retardant by coating with 10-50% by weight, based on the weight of the polymer, of a mixture of a highly halogenated non-volatile hydrocarbon and antimony oxide.  Specified are polymers of styrene, a -methyl styrene, vinyl toluene and p-chlorostyrene, copolymers of these monomers, and copolymers of one or more of these monomers with a minor amount of a monomer such as acrylonitrile, methyl methacrylate, vinyl acetate, butadiene or isoprene, plasticizers highly refined paraffinic or napthenic oil, cetyl benzene, polydodecyl benzene, dibutyl or dioctyl phthalate, triphenyl phosphate, a tritolyl or a trixenyl phosphate, tris-(2, 3-dibromopropyl) orthophosphate and chlorinated diphenyl and highly halogenated non-volatile hydrocarbons chlorinated paraffin waxes and chlorinated napththalenes.  An internal flame-retardant agent, e.g. a triaryl phosphate or tris-(2, 3-dibromopropyl) orthophosphate, may have been incorporated into the polymer particles.  The polymer particles contain a volatile expanding agent, e.g. butane, to render them expandable, and may be pre-expanded before treating and coating. Specification 927,872 is referred to.