High modulus colorless polyimide film and method of preparation

A method for manufacturing a transparent polyimide film, the method comprising the steps of:

• providing a polyimide precursor solution, wherein:
• the polyimide precursor solution is manufactured by reacting, in an organic solvent:
• one or more diamines;
• a first dianhydride represented by biphenyl dianhydride;
• a second dianhydride represented by rigid alicyclic dianhydride;
• and
• a third dianhydride represented by non-alicyclic dianhydride;
• relative to all dianhydrides which can be considered as 100 mol %:
• the first dianhydride represented by biphenyl dianhydride is in an amount of 10 to 80 mol %;
• the second dianhydride represented by rigid alicyclic dianhydride is in an amount of 10 to 80 mol %;
• and
• the third dianhydride represented by non-alicyclic dianhydride is in an amount of 10 to 80 mol %;
• mixing the polyimide precursor solution with a catalyst and a dehydrant to obtain a mixture;
• casting the mixture on a glass plate or other substrate;
• drying to remove the solvent;
• obtaining a semi-dried film;
• and
• producing the transparent polyimide film from the semi-dried film.