Bromine Compounds Limited

David Yoffe

Mark Gelmont

Ron Frim

Michael Yuzefovich

Andrew M Piotrowski

Yaniv Hirschsohn

Michael Yuzefovitch

Renata Yelizarov

Lior Melamed

The invention relates to a process for preparing bromine-containing polymer, comprising a Friedel-Crafts alkylation reaction of tetrabromoxylylene dihalide, or tetrabromoxylylene dihalide in combination with pentabromobenzyl halide, with a reactant having one or more six-membered aromatic rings, wherein the reaction takes place in a solvent in the presence of a Friedel-Crafts catalyst, and isolating from the reaction mixture the bromine-containing polymer. The so-formed polymers and their use as flame retardants form additional aspects of the invention.

Bromine-containing polymers useful as flame retardants

Preparation of bromine-containing polymers useful as flame retardants

The invention provides a process for preparing bromine-containing polymers, comprising a Friedel-Crafts alkylation reaction of pentabromobenzyl halide with a polymer reactant which contains one or more six-membered aromatic ring(s) in its repeat unit, in the presence of at least one Friedel-Crafts catalyst. The so-formed bromine-containing polymers, having pendent &#x2014;CHCBrgroups attached to at least a portion of the six-membered aromatic rings of the polymer, with a carbon ring atom of said six-membered aromatic ring being bonded to the aliphatic carbon of said &#x2014;CHCBrpendent group, are also provided. These bromine-containing polymers are useful as flame retarding agents.

Preparation of bromine-containing polymers and their application as flame retardants

The invention relates to compounds of the formula Ar(&#x2014;CHCBr), wherein Ar indicates a structure comprising one or more six-membered aromatic ring(s) and &#x2014;CHCBrindicates a pentabromobenzyl group, characterized in that at least one carbon atom of said six-membered aromatic ring(s) is bonded to the benzylic carbon of said &#x2014;CHCBrgroup, wherein y, which indicates the number of the &#x2014;CHCBrgroups in said compound, is not less than 1. Processes for preparing the compounds and their use as flame retardants are also disclosed.

Preparation of bromine-containing aromatic compounds and their application as flame retardants

The invention relates to compounds of the formula Ar(&#x2014;CH2C6Br5)y, wherein Ar indicates a structure comprising one or more six-membered aromatic ring(s) and &#x2014;CHCBrindicates a pentabromobenzyl group, characterized in that at least one carbon atom of said six-membered aromatic ring(s) is bonded to the benzylic carbon of said &#x2014;CHCBrgroup, wherein y, which indicates the number of the &#x2014;CHCBrgroups in said compound, is not less than 1. Processes for preparing the compounds and their use as flame retardants are also disclosed.

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Haifa, Israel

David Yoffe