| 摘要 |
The invention comprises an aromatic polyamide polymer having oxy-or thio- groups in ortho or peri relationship to the amide structural units which can be cyclised to form benzoxazole or benzthiazole structural units by heating, and -CONH-, CO.0- or -CO.S- structural units which are not able to cyclise at the temperature at which the benzoxazole or benzthiazole units are formed. Such a polymer is prepared by reacting [A] 9 polybasic carboxylic aromatic acid or a functional derivative thereof, with [B] a bis o-amino thiophenol or a functional derivative thereof, with [B] a bis o-amino phenol or a bis o-amino thiophenol or a functional derivative thereof and [c] a third component of formula: X - Ar- Z Z where X and Z are the same or different and represent a hydroxyl, amino or thiol group, and Ar represents an aromatic group such that X and Z are not in ortho or peri relationship. |
