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公开(公告)号:EP0520007A1
公开(公告)日:1992-12-30
申请号:EP91906520
申请日:1991-03-12
摘要: Procédé de purification d'homo-polymères et de co-polymères styréniques bromés. Le procédé de purification réduit ou élimine le brome aliphatique contenu, ainsi que le brome libre résultant de la réaction du réactif bromé avec le squelette de polystyrène. De plus, le procédé élimine facultativement les impuretés d'halogénure inorganique occluses provenant du polymère. Ces impuretés sont considérées comme étant indésirables du fait de leurs effets négatifs sur le vieillissement thermique et la stabilité des préparations de résines à usage final.
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公开(公告)号:EP0710255A4
公开(公告)日:1997-03-26
申请号:EP94922686
申请日:1994-07-22
IPC分类号: C08L25/18 , C08F2/00 , C08F2/02 , C08F12/00 , C08F12/16 , C08F14/16 , C08F212/00 , C08F212/14 , C08L25/00 , C08F212/06
摘要: A process for the solventless polymerization of brominated styrenes includes blending monomers of brominated styrenes with a polymerization initiator, feeding the monomer/polymerization initiator mix into a prepolymerizer wherein the monomers begin to polymerize, and feeding the monomer/polymerization initiator mix and the partially polymerized bromostyrene into a screw-type extruder to drive the polymerization to a high degree of completion in a short period of time. Optionally, the monomers may be preheated before mixing with the initiator, or a heater may be included in the prepolymerizer.
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公开(公告)号:EP0636159A4
公开(公告)日:1995-06-28
申请号:EP93909500
申请日:1993-04-09
摘要: A flame retarding additive composition, useful in thermoplastic polyolefins, is disclosed comprising a mixture of a halogenated bisphenol derivative and the copolymer of a halogenated vinyl aromatic grafted onto polyolefin. The preferred bisphenol derivative is tetrabromobisphenol A bis(dibromopropyl ether), and the preferred graft copolymer comprises bromostyrene grafted onto isotactic or syndiotactic polypropylene. Also disclosed are the flame retarded, thermoplastic polyolefins prepared using the foregoing additive compositions.
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