Albemarle Corporation

Ethyl Corporation

Ethyl Petroleum Additives, Inc.

Ablemarle Corporation

Albelmarle Corporation

Charles H Kolich

W Dirk Klobucar

Meng-Sheng Ao

Donald E Balhoff

Billie B Dadgar

Homer C Lin

Arthur G Mack

William J Layman, Jr

Thanikavelu Manimaran

John F Balhoff

Ronny W Lin

Govindarajulu Kumar

David R Brackenridge

Douglas W Luther

Junzuo Wang

Jonathan P McCarney

Jeffrey Todd Aplin

Zhongxin Ge

Henry G Braxton, Jr

Thorsten W Brockmann

Jorge Morice

Martin B Berdon

William J Layman

Bo Liu

Chi Hung Cheng

Bruce C Peters

Gerald M Sulzer

Kimberly M White

Jon S Reed

Robert C Herndon

Jeffrey T Books

Steven A Anderson

Urho A Lehikoinen

David A Lee

Saadat Hussain

Tse-Chong Wu

William R Brown

Bruce C Berris

Susan D Landry

J Vincent Hanlon

Suae-Chen Chang

Daniel A De Schryver

Hoover Chew

Bernard R Meltsner

John G Bostick

Kimberly A Maxwell

J Todd Aplin

Thorsten W Brockman

Ravindra R Joshi

Todd J Aplin

Dirk W Klobucar

Jr Robert C Herndon

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

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 provides adducts, mixtures of adducts and oligomers, and/or mixtures of adducts, oligomers, and low molecular weight polymers formed from monovinylaromatic hydrocarbons.

Adducts, adducts and oligomers, or adducts, oligomers and low molecular weight polymers, and their preparation

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

This invention relates to novel and useful toluene and styrene derived telomer distributions, such distributions being desirable substrates for the preparation of brominated flame retardants.

Toluene and styrene derived telomer distributions and brominated flame retardants produced therefrom

Bromination of telomer mixtures derived from toluene and styrene

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

Brominated styrenic polymer is recovered from solution in a vaporizable solvent by converting the solution in a devolatilization extruder into a brominated styrenic polymer melt or flow and a separate vapor phase comprised predominately of vaporizable solvent, recovering the melt or flow from the devolatilization extruder, and allowing or causing the melt or flow to solidify. The solidified brominated styrenic polymer can be subdivided into a powder or pelletized form. Pellets so made have improved hardness and/or crush strength properties along with reduced formation of fines. Brominated anionic styrenic polymer is preferably used in the process.

Process technology for recovering brominated styrenic polymers from reaction mixtures in which they are formed and/or converting such mixtures into pellets or into granules or pastilles

Preparing brominated styrenic polymer by maintaining a mixture formed from (i) brominating agent, (ii) a solvent solution of styrenic polymer, and (iii) aluminum halide catalyst, at &#x2212;20 to +20&#xb0; C., and terminating bromination in 20 minutes or less. New brominated anionic styrenic polymers have better melt flow and/or lower initial &#x394;E values than the best previously-known brominated anionic styrenic polymers. Other features of such new polymers include high thermal stabilities at 320&#xb0; C. and/or very low initial color values. Brominated styrenic polymers, especially brominated anionic styrenic polymers, are useful as flame retardants for thermoplastic polymers.

Brominated styrenic polymers and their preparation

Concurrently fed into a reaction zone held at about 10&#xb0; C. or less are brominating agent, aluminum halide catalyst, and a solution of anionic styrenic polymer having a GPC Mn about 2000-30,000. The components are in at least two separate feed streams. The feeds are proportioned to maintain (a) the amount of aluminum halide being fed at about 0.8 mole percent or less based on the amount of aromatic monomeric units in the polymer being fed, and (b) amounts of brominating agent and unbrominated polymer in the reaction zone that produce a final washed and dried polymer product containing about 60-71 wt % bromine. The catalyst is deactivated, bromide ions and catalyst residues are washed away from the reaction mixture, and the brominated anionic styrenic polymer is recovered and dried. The dried polymer has a volatile bromobenzene content of about 600 ppm (wt/wt) or less as well as other beneficial properties.

Brominated anionic styrenic polymers and their preparation

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Baton Rouge, LA, United States of America

Charles H Kolich