Patent ID: 6984714

Claim:
A polyimide resin which is obtained from an aromatic tetracarboxylic acid dianhydride (A) and a diamine (B) comprising 40–70 mol % of an aromatic diamine having an aliphatic straight chain (B1) represented by the following general formula (1) (wherein n is 3–10 denoting the average number of repeating units) and 30–60 mol % of a siloxanediamine (B2) represented by the following general formula (2) (wherein R 1 and R 2 are divalent hydrocarbon radicals, R 3 –R 6 are hydrocarbon radicals containing 1–6 carbon atoms and m is 1–10 denoting the average number of repeating units) as essential components, and wherein the polyimide resin has a glass transition temperature of 30–200° C.