Process for the preparation of the monomer pentabromobenzyl acrylate and polymerization thereof
AssigneeBromine Compounds Ltd.
InventorJacob Oren
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Abstract
A process for preparing pentabromobenzyl acrylate through the reaction of pentahalobenzyl halide with a salt of acrylic acid in a water-immiscible solvent, wherein said salt is in aqueous form and the reaction is carried out in the presence of a phase transfer catalyst. A process for polymerizing the pentabromobenzyl acrylate in halogenated aromatic solvent and the poly(pentabromobenzyl acrylate) obtained are also disclosed.
Claims14
A process comprising reacting pentahalobenzyl halide with a salt of acrylic acid in water-immiscible solvent, wherein said salt is in aqueous form and the reaction is carried out in the presence of a phase transfer catalyst, separating the reaction mixture into organic and aqueous phases prior to the completion of the reaction, removing the aqueous phase and collecting the organic phase which contains unreacted pentahalobenzyl halide, and allowing the reaction to reach completion through one or more successive reaction stages, wherein each of said one or more successive reaction stages comprises combining an organic phase separated from a previous reaction stage with an aqueous solution comprising a salt of acrylic acid, and recovering the pentahalobenzyl acrylate product.
A process comprising continuously feeding into a first reaction zone a water immiscible organic solvent, pentahalobenzyl halide, a phase transfer catalyst and a first amount of an aqueous alkali acrylate salt, to form a first reaction mixture maintained under heating;
- continuously removing a reaction mass from said first reaction zone and separating said reaction mass into an organic and aqueous phases;
- continuously passing said organic phase to a second reaction zone into which a second amount of said aqueous alkali acrylate salt is being continuously supplied, and collecting a solution of the pentahalobenzyl acrylate product in said organic solvent and optionally isolating the pentahalobenzyl acrylate product in a solid form.
Dependencies are inferred from the claim text.