A polyamic acid resin composition includes (a) a polyamic acid having structures represented by general formula (1) in an amount of at least 80% of all the repeating units and (b) a solvent. In formula (1), A is a polyamic acid block represented by general formula (2); B is a polyamic acid block represented by general formula (3); and k is a positive integer. In formula (2), Ws are divalent organic groups having two or more carbon atoms, mainly composed of divalent organic groups represented by general formula (4); Xs are tetravalent organic groups having two or more carbon atoms. In formula (3), Ys are divalent organic groups having two or more carbon atoms, exclusive of the groups represented by formula (4); Zs are tetravalent organic groups each having two or more carbon atoms, and are mainly composed of tetravalent organic groups represented by general formula (5) or (6).
一种聚酰胺酸
树脂组合物包括(a)至少占所有重复单元的80%的结构由通式(1)表示的聚酰胺酸和(b)溶剂。在公式(1)中,A是由通式(2)表示的聚酰胺酸块;B是由通式(3)表示的聚酰胺酸块;k是正整数。在公式(2)中,Ws是具有两个或更多碳原子的二价有机基团,主要由通式(4)表示的二价有机基团组成;Xs是具有两个或更多碳原子的四价有机基团。在公式(3)中,Ys是具有两个或更多碳原子的二价有机基团,不包括公式(4)表示的基团;Zs是具有两个或更多碳原子的四价有机基团,主要由通式(5)或(6)表示的四价有机基团组成。