| 摘要 |
<p>Disclosed is a polybenzoxazole having high glass transition temperature, high transparency, high solubility in solvents, low birefringence, low water absorption and sufficient toughness at the same time. Also disclosed is a film composed of such a polybenzoxazole. Specifically disclosed are a polybenzoxazole containing a monomer unit represented by the formula (1) below (wherein R represents a divalent alicyclic group) as a repeating unit, and a substrate material composed of such a polybenzoxazole. (1) P's respectively represent a hydrogen atom, a linear or branched alkyl group having 1-12 carbon atoms, a linear or branched alkenyl group having 1-12 carbon atoms, a linear or branched alkoxy group having 1-12 carbon atoms, an alicyclic group having 6-12 carbon atoms or an aromatic group having 6-12 carbon atoms. The alicyclic group and aromatic group may contain a halogen, nitrogen or oxygen containing substituent. In addition, P's may be different from each other.</p> |
