Colorless polyimide film containing fluorine and cardo structure and preparation method thereof
US11697710B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | Aug 7, 2019 |
| Grant date | Jul 11, 2023 |
| Priority date | — |
| Expiry date | Mar 25, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.