A polyimide comprising a requisite structural unit having one or more recurring structural units of the formula: ##STR1## such as the structural units of the formula ##STR2## The polyimide can have an extremely low dielectric constant and is colorless, transparent and excellent in processability and heat resistance, and also provides an aromatic diamine which is useful as a raw material monomer of the polyimide or a raw material of other various engineering plastics.
一种聚
酰亚胺,包括具有一个或多个重复结构单元的必需结构单元,其
化学式为:##STR1## 如
化学式##STR2##所示的结构单元。该聚
酰亚胺可以具有极低的介电常数,且无色、透明,加工性和耐热性优异,还提供了一种芳香族二胺,可用作聚
酰亚胺的原料单体或其他各种工程塑料的原料。