Preparation method of polybenzimidazole
US8642722B2 · kind B2 · utility
1Cited by
20References
8Claims
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Key dates
| Filing date | May 15, 2009 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Jan 28, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a method of preparing porous polybenzimidazole. The method includes providing polyaminoimide by reacting aromatic amine including at least two ortho-positioned amino groups and acid dianhydride, obtaining polypyrrolone from the polyaminoimide, subjecting the polypyrrolone to alkaline treatment, and subjecting the alkaline-treated polypyrrolone to heat treatment. The polybenzimidazole shows permeability and selectivity for various gases due to a fractional free volume and well-connected picopores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.