Method of manufacturing colorless transparent polyimide film having impregnated glass fabric and of flattening surface thereof
US9469735B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2014 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Feb 25, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a method of manufacturing a colorless transparent polyimide film having impregnated glass fabric, wherein the surface of the polyimide film substrate having impregnated glass fabric is flattened by two flattening steps using a roll-to-roll process, thereby solving problems with an increase in surface roughness of the polyimide substrate when manufacturing the polyimide film having impregnated glass fabric in order to enhance thermal and mechanical properties of a film for use in flexible display substrates and in cover windows for flat panel displays and mobile phones. As the surface roughness of the polyimide film having impregnated glass fabric is flattened to the level of ones of nm from the level ranging of tens of nm to ones of μm, a thin film transistor process can be performed on the polyimide film substrate and the polyimide film is increased in optical transmittance and transparency and can thus be utilized as flexible display substrates and cover windows for flat panel displays and mobile phones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.