| abstract |
【Task】 Disclosed is a polyimide copolymer which has high solvent solubility, excellent flexibility, and does not substantially generate siloxane-based outgas. [Solution] (A) component: (A1) a tetracarboxylic dianhydride containing an ester group, and (A2) 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride, And (B) component: (B1) an aromatic diamine containing an ether group, and (B2) A polyimide copolymer obtained by imidizing a diamine containing an oxyalkylene group. |