| 摘要 |
Liquid-crystalline, completely aromatic copolyesters are disclosed, which are endowed with a heat stability not lower than 350 DEG C., and are constituted by a succession of repeatitive units containing: <IMAGE> and H-NRQ wherein A and B, which can be either equal to, or different, from, each other, can be either -0- or and one of the following moieties: <IMAGE> in which Ar can be 1,4-phenylene, 2-monosubstituted-1,4-phenylene or 4,4'-diphenylene. Also copolyesters also containing amidic bonding groups are disclosed.
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