Bromine-containing polymers useful as flame retardants
AssigneeBromine Compounds Ltd.
InventorsMark Gelmont, Michael Yuzefovich, Andrew Piotrowski, David Yoffe, Ron Frim, Yaniv Hirschsohn
Life of this patent
Estimating the term…
Abstract
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.
Claims10
A polymer having —CH2C6Br4CH2— and A units arranged alternately along the polymer backbone chain:
- ≈≈CH2C6Br4CH2-A-CH2C6Br4CH2-A-CH2C6Br4CH2-A-CH2C6Br4CH2-A≈≈
- wherein A comprises one or more six-membered aromatic rings, the polymer further comprising —CH2C6Br5 side groups attached to at least a portion of the six-membered aromatic rings of the backbone chain, wherein at least one carbon atom of said six-membered aromatic ring(s) is bonded to the aliphatic carbon of said —CH2C6Br5 group.
Dependencies are inferred from the claim text.