| abstract |
The invention relates to a process for the preparation of cardopolyamides, which can be used as high temperature resistant fibers, papers, films, etc., while maintaining a good solubility, the thermal stability is increased. According to the invention, the cardopolyamides are prepared by polycondensation of diamines with 9,9-bis-phenylcarboxylic acid dichloride (4 ', 4 ยป). Formula I |