Colorless polyimide film containing fluorine and cardo structure and preparation method thereof
AssigneesRAYITEK Hi-Tech Film Company, Ltd., Shenzhen, Jiaxing RAYITEK Film Technology Co., Ltd.
InventorsYanYan Jiang, ZhenZhong Wang, Xi Ren, Wei Zhang
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Abstract
A polyimide film contains fluorinated substituents and cardo structures. The polyimide film exhibits excellent heat-resistance, transparency and mechanical properties. The polyimide film has a glass-transition temperature (Tg) of at least 360° C., a coefficient of thermal expansion (CTE) of 50 ppm/° C. or lower, a modulus of at least 4.0 Gpa, a b* value of 5 or lower and yellowness index of 8 or less. The polyimide film can be used as a display substrate or an optical film in a liquid crystal display (LCD), an organic light-emitting diode (OLED) and in other fields where the characteristic features are required.
Claims14
A polyamic acid solution, comprising:
- a product, containing at least one fluorinated substituent and one cardo structure, obtained by co-polymerizing, in an organic solvent, at least one diamine and at least one tetracarboxylic dianhydride;
- wherein the molar ratio of total amount of diamine to the total amount of tetracarboxylic dienhydride is in the range of from 0.98 to 1.1;
- wherein the at least one diamine is a monomer having Structural Formula 1;
- wherein the at least one tetracarboxylic dianhydride is a combination of three monomers selected from Structural Formula 3, Structural Formula 4, and Structural Formula 5, such that, in the tetracarboxylic dianhydride:
- Structural Formula 3 is present in the range of from 10 mol % to 30 mol %,
- Structural Formula 4 is present in the range of from 30 mol % to 80 mol %, and
- Structural Formula 5 is present in the range of from 5 mol % to 50 mol %;
- wherein Structural Formula 1 is:
- wherein Structural Formula 3 is:
- wherein Structural Formula 4 is:
- in which the substituent Ar is selected from the group consisting of any of the following structures:
- wherein Structural Formula 5 is:
- in which, in Structural Formula 4 and Structural Formula 5, Q5, Q6 and Q7 are each independently selected from the group comprising a single bond, —O—, —S—, —SO2—, —C(═O)—, —C(═O)O—, —C(═O)NH—, a phenylene group and a combination thereof.
A polyamic acid solution, comprising:
- a product, containing at least one fluorinated substituent and one cardo structure, obtained by co-polymerizing, in an organic solvent, at least one diamine and at least one tetracarboxylic dianhydride;
- wherein the molar ratio of total amount of diamine to the total amount of tetracarboxylic dianhydride is in the range of from 0.98 to 1.1;
- wherein the at least one diamine is a combination of two monomers, one having Structural Formula 1 and the other having Structural Formula 2, such that the total diamine is in the range of from 60 mol % to 95 mol % Structural Formula 1;
- wherein the at least one tetracarboxylic dianhydride is a combination of two monomers, one having Structural Formula 3 and the other having Structural Formula 4, such that, in the tetracarboxylic dianhydride:
- Structural Formula 3 is present in the range of from 10 mol % to 40 mol %;
- and
- Structural Formula 4 is present in the range of from 60 moi % to 90 mol %;
- wherein Structural Formula 1 is:
- wherein Structural Formula 2 is:
- in which each of Q1, Q2, Q3 and Q4 are independently selected from the group consisting of:
- a hydrogen, a halogen, a hydroxyl group, a thiol group, a nitro group, a C1-10 alkyl group, a C1-4 halogenoalkoxyl group, a C1-10 halogenoalkyl group, a cyano group and a C6-20 aryl group;
- wherein Structural Formula 3 is:
- wherein Structural Formula 4 is:
- in which the substituent Ar is selected from the group consisting of any of the following structures:
- in which, in Structural Formula 4 Q5 is selected from the group consisting of:
- a single bond, —O—, —S—, —SO2—, —C(═O)—, —C(═O)O—, —C(═O)NH—, a phenylene group and a combination thereof.
Dependencies are inferred from the claim text.