| 摘要 |
PURPOSE: Provided are a polyimide based copolymer having high solubility and excellent adhesion, a method for producing the same, an insulating film composition having controlled dielectric constant, and a method for producing the insulating film. CONSTITUTION: The polyimide based copolymer comprises a compound represented by formula 1, a compound represented by formula 2, and a compound represented by formula 3. In the formulae, each of l, m and n represents an integer of 1-500. The polyimide based copolymer has intrinsic viscosity of 0.3-0.5 dl/g, and glass transition temperature of 300-370 deg.C. The polyimide based copolymer is prepared by the steps of (i) dissolving a compound of formula 1, a compound of formula 2, and a compound of formula 3 in solvent to form a solution of amic acid; and (ii) heating the solution to condensation react the solution.
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