Back to results
US 2008/0188639 A1Published application
Processes for Hydrolyzing Polyphosphoric Acid in Shaped Articles
AssigneeE.I. duPont de Nemours and Company
InventorChristopher W. Newton
Life of this patent
Estimating the term…
Abstract
The present invention relates to processes for hydrolyzing polyphosphoric acid in shaped articles.
Claims12
A process for hydrolyzing polyphosphoric acid in a shaped article comprising polyareneazole polymer and polyphosphoric acid, the process comprising:
- a) removing surface liquid from the shaped article;
- and
- b) contacting the shaped article with a hot surface having a temperature of at least about 150° degrees C. to hydrolyze polyphosphoric acid;
- and
- c) subsequently removing hydrolyzed polyphosphoric acid from the hot-surface-contacted shaped article.
2 more elements
Dependencies are inferred from the claim text.