Flame retardant bromobenzyl systems
AssigneeBromine Compounds Ltd.
InventorsJakob Oren, Nasif Yassin, Joseph Zilberman, Dorit Canfi, Ron Frim, Dov Beruben
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Abstract
Polybrominated bisaryl compounds containing bromomethyl or bromomethylene groups are provided, as well as flameproof polymeric formulations comprising the compounds. The novel compounds exhibit a good thermal stability, and are particularly suitable for flame-retarding polystyrene thermoplastic foams. A process for making the polybrominated bisaryl compounds is also provided.
Claims18
Polybrominated bisaryl compounds containing bromomethyl/bromomethylene groups according to the following formula (I):
- wherein
- a) Z is a bond, —O—, —CH2—, —CH(CH3)—, —OCH2CH2O—, n=1-4, p=1-4, m=1-4, and q=1-4;
- or
- b) Z is —CH(Br)—CH(Br)—, n=1-4, p=1-4, m=0, and q=0.
A flameproof formulation comprising a polymeric material and at least one of the polybrominated bisaryl compounds containing bromomethyl/bromomethylene groups according to formula (I):
- wherein
- a) z is a bond, —O—, —CH2—, —CH(CH3)—, —OCH2CH2O—, n=1-4, p=1-4, m=1-4, and q=1-4;
- or
- b) Z is —CH(Br)—CH(Br)—, n=1-4, p=1-4, m=0, and q=0.
A process for preparing a polybrominated bisaryl compound containing bromomethyl/bromomethylene groups according to formula (I):
- wherein Z is a bond, —O—, —CH2—, —CH(CH3)—, —OCH2CH2O—, n=1-4, p=1-4, m=1-4, and q=1-4,
- said process comprising aromatic ring-bromination, followed by benzylic bromination.
A process for preparing a polybrominated bisaryl compound having formula F
- said process comprising bromine addition to the double bond of stilbene, and aromatic ring-bromination.
Dependencies are inferred from the claim text.