Process for brominated styrenic polymers
AssigneeAlbemarle Corporation
InventorsMeng-Sheng Ao, Billie B. Dadgar, Charles H. Kolich, Donald E. Balhoff, Homer C. Lin, David R. Brackenridge, Thorsten W. Brockman
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Abstract
This invention relates to the bromination of styrenic polymers by contacting same with a brominating agent in the presence of a bromination catalyst and, as a reaction solvent, bromochloro-methane.
Claims57
A process for producing brominated polystrene, which process comprises feeding a mixture comprised of a brominating agent and polystyrene to a reaction vessel to which was previously added bromochloromethane solvent and a Lewis acid catalyst, the mole ratio of brominating agent to polystyrene in the feed mixture being from about 1:1 to about 8:1.
A process which comprises contacting styrenic polymer with a brominating agent in the presence of a bromination catalyst and a solvent quantity of bromochloromethane to form brominated styrenic polymer.
A process which comprises adding a brominating agent to a reactor containing styrenic polymer, bromochloromethane, and a bromination catalyst to form brominated styrenic polymer.
A process which comprises brominating styrenic polymer in the presence of a bromination catalyst and a solvent quantity of bromochloromethane such that brominated styrenic polymer containing at least 30 wt % bromine, based upon the total weight of the brominated polymer, is formed.
A process which comprises brominating styrenic polymer having a molecular weight of at least 50,000 with a brominating agent in the presence of a bromination catalyst and an amount of bromochloromethane solvent that can dissolve the styrenic polymer and the brominated styrenic polymer species produced.
A process for preparing a brominated styrenic polymer, which process comprises brominating a styrenic polymer having a molecular weight in the range of 150,000 to 500,000 with a brominating agent in the presence of a bromination catalyst and in a solvent quantity of bromochloromethane.
A process of preparing a brominated styrenic polymer, which process comprises adding to a reactor containing a bromination catalyst (i) a styrenic polymer stream comprised of a solution of styrenic polymer and bromochloromethane, and (ii) a brominating agent stream, said streams being added separately but substantially concurrently.
A process of preparing a brominated styrenic polymer, which process comprises adding a mixture which includes a brominating agent, styrenic polymer, and bromochloromethane to a reactor containing a bromination catalyst.
A process which comprises feeding a feed comprised of polystyrene and bromochloromethane and a separate feed comprised of a brominating agent to a reactor containing bromochloromethane solvent and a bromination catalyst.
A process which comprises feeding a mixture comprised of brominating agent and polystyrene to a reactor containing bromochloromethane solvent and a bromination catalyst.
Dependencies are inferred from the claim text.