Albemarle Corporation

Govindarajulu Kumar

Arthur G Mack

William J Layman, Jr

Charles H Kolich

Bo Liu

Douglas W Luther

Kimberly M White

Zhongxin Ge

Junzuo Wang

Jonathan P McCarney

Jorge Morice

William J Layman

Christopher J Nalepa

Mahmood Sabahi

Bruce C Berris

John C Prindle

Hoover Chew

Mark W Beltz

Timothy John St Romain

Vijay M Kotian

Ravindra R Joshi

John M McEuen

This invention relates flame retardant compositions containing low molecular weight brominated anionic, chain transfer, vinyl aromatic polymers, hereinafter 'ACTVAP'. The compositions can accommodate high bromine content while still exhibiting a low thermally labile bromine content. The compositions have glass transition temperatures, T, that are predictive of acceptable melt flows and heat distortion temperatures (HDT) in HIPS and ABS based formulations substrates. The compositions, are suitable flame retardant candidates for use in thermoplastic formulations, e.g. polystyrene and ABS formulations.

Low molecular weight brominated polymers, processes for their manufacture and their use in thermoplastic formulations

The present invention relates to the use of pelletized flame retardants and flame retardant compositions in the formation of flame retarded formulations, the resulting flame retarded formulations, and molded and/or extruded articles made from such flame retarded formulations.

Flame retarded formulations

Described are a particular group of novel aromatic hydrocarbon telomers that, on bromination, result in the formation of novel flame retardants having a uniquely beneficial combination of properties. The resultant flame retardants and uses thereof are also described. The disclosure includes descriptions of methods for preparing both the aromatic hydrocarbon telomers and the brominated flame retardant polymers.

Brominated flame retardants and precursors therefor

This invention relates flame retardant compositions containing low molecular weight brominated anionic, chain transfer, vinyl aromatic polymers, hereinafter 'ACTVAP'. The compositions can accommodate high bromine content while still exhibiting a low thermally labile bromine content. The compositions have glass transition temperatures, Tg, that are predictive of acceptable melt flows and heat distortion temperatures (HDT) in HIPS and ABS based formulations substrates. The compositions, are suitable flame retardant candidates for use in thermoplastic formulations, e.g. polystyrene and ABS formulations.

Low molecular weight brominated polymers and their use in thermoplastic formulations

Novel polymer compositions of specified formula are converted into pellets of this invention by process technology provided by this invention. By forming a binder free melt of a polymer of such polymer compositions, and converting the melt into pellets as described here-in, pellets can be formed produce during production, handling, and use, no more than acceptably small amounts of 'fines' or air-entrainable dusts.

Pelletized low molecular weight brominated aromatic polymer compositions

New branched or star-branched styrene polymeric, telomeric, and monomeric product distributions, their preparation, their use as raw materials for bromination to produce flame retardants, the flame retardants themselves, and their use as flame retardants in various polymeric substrates are described.

Branched and star-branched styrene polymers, telomers, and adducts, their synthesis, their bromination, and their uses

Thermoplastic polycarbonate-ABS resin is rendered flame retardant by blending with the resin an O,O-diaryl-N-arylphosphoramidate, an arylene-N,N&prime;-bis(O,O-diarylphosphoramidate) in which the nitrogen atoms are in the 1,3 or 1,4 positions on an arylene ring, or an N,N&prime;-piperazinediylbis(O,O-diarylphosphoramidate). These flame retardants are halogen-free. They provide molded objects having high heat distortion temperatures, and high softening temperatures. Flame retardants of these types have been found to be thermally stable at temperatures of at least 260&deg; C., and they did not discolor the polymer composition during exposure to molding temperatures.

Flame retardant polycarbonate-ABS polymer compositions

Compositions and methods are described wherein a styrenic polymer is rendered flame retardant by incorporation therein before, during or after its formation, a combination of (a) at least one organic phosphorus additive that (i) is halogen-free, and (ii) is composed solely of carbon, hydrogen, and phosphorus, and optionally and preferably one or more of the elements nitrogen, oxygen, and sulfur; and (b) elemental sulfur; in proportions such that (i) the sulfur content from b) is less than 2 percent by weight of the weight of the styrenic polymer plus the weight of a) and b), and (ii) the styrenic polymer plus ingredients a) and b) can provide test specimens which exhibit an LOI of at least 24 if tested in accordance with ASTM Standard Test Method D 2863-87.

Flame retardant styrenic polymers

Compounds varying from liquids to solids can be prepared via a reaction in which at least one Michael donor is reacted with one or more Michael acceptors in the presence of an undissolved basic compound as the catalyst.

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Baton Rouge, LA, United States of America

Govindarajulu Kumar