Biaxially oriented polyethylene terephthalate film and method for producing same
US9212268B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2013 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Jul 19, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This film provides a polyethylene terephthalate film whereby dimensional variation in various steps can be reduced, particularly when the film is used as a substrate film for a flexible device, and that is suitable as a substrate film having minimal curl and excellent appropriateness for processing. This biaxially oriented polyethylene terephthalate film has a degree of crystallinity (Xc) of 0.35 to 0.50, the intrinsic viscosity (IV) of the resin constituting the film is 0.66-1.0 dl/g, the coefficient of thermal expansion at a temperature of 50-170° C. in each of the machine direction and transverse direction of the film is 0.29 ppm/° C., and the degree of thermal shrinkage at 180° C. in each of the machine direction and transverse direction of the film is 0.5%-1.0%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.