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US 2003/0166792 A1Published application
Method for nitrating and aminating an aryl polymer
AssigneeCelanese Ventures GmbH
InventorWei Cui
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Abstract
The invention relates to a novel and inexpensive process for the nitration and amination of aryl polymers and also to their use as blend components for producing polymer blend membranes. Such polymer blend membranes are used in membrane processes, in particular as polymeric electrolyte in electromembranes, e.g. for electrodialysis and fuel cells.
Claims16
A process for preparing a nitrated aryl polymer, which comprises the steps:
- a) dissolving aryl polymer in concentrated sulfuric acid at temperatures below 25° C.
- b) adding concentrated nitric acid at temperatures below 25° C.
- c) precipitating the resulting nitrated aryl polymer in water and separating off the precipitated nitrated aryl polymer.
A substituted polyether sulfone or substituted polyether ether sulfone both of the formulae (A) and (B) and in the form of a corresponding block polymer of the formula (C)
- 8
- where X is oxygen or hydrogen and m and n are each a number in the range from 1 to 100.
Dependencies are inferred from the claim text.