Polyamide-imide having head-to-tail backbone
US6433184B1 · kind B1 · utility
2Cited by
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8Claims
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Key dates
| Filing date | Jun 28, 2000 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Sep 8, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to polyamide-imides having head-to-tail backbone and more particularly, to polyamide-imimdes having head-to-tail ragularity to provide excellent heat and chemical resistance, physical and mechanical properties, processability, and gas permeability and selectivity. The polyamide-imides represented in the following formula (1) are obtained by direct polymerization, in the presence of dehydrating catalyst, of alone or as a mixture of 2 or above of monomers prepared by condensation of an amine compound having a nitro group with a carboxylic acid anhydride,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.