Process for the removal of N-vinylcarbazole from poly(N-vinylcarbazole)
AssigneeSartomer Company, Inc.
InventorsC. Richard Costin, Thomas W. Hazell, Gary W. Ceska, James P. Horgan
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Abstract
The residual level of N-vinylcarbazole in polyvinylcarbazole has been reduced to an amount less than 25 ppm by treatment of a solution of the polyvinylcarbazole with a strong acid. The polymer can be recovered in pure form by precipitation of the polymer from solution with a non-solvent.
Claims15
A process for removing N-vinylcarbazole from poly-(N-vinylcarbazole), comprising the steps of dissolving poly-(N-vinylcarbazole) in a suitable first solvent, treating the poly-(N-vinyl-carbazole)-containing first solvent with an effective amount of a strongly acidic compound sufficient to reduce the content of N-vinylcarbazole in said poly-(N-vinylcarbazole), and recovering purified poly-(N-vinylcarbazole).
Dependencies are inferred from the claim text.