| 摘要 |
There is provided an aromatic benzoxazole polymer having repeating units of the formula <IMAGE> wherein Ar is <IMAGE> <IMAGE> wherein R is an alkyl group having 8 to 12 carbon atoms. The polymers of this invention are prepared by the polycondensation of 4,4'-hexafluoroisopropylidene bis(2-aminophenol) with a dicarboxylic acid selected from the group consisting of isophthalic acid, terephthalic acid, 2,5-pyridine dicarboxylic acid, 2,6-pyridine dicarboxylic acid and a 2,5-bis(alkoxy) terephthalic acid of the formula <IMAGE> wherein R is an alkyl group having 8 to 12 carbon atoms, in a suitable reaction medium containing a suitable dehydrating agent.
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