Biaxial oriented polyester film
US5268135A · kind A · utility
11Cited by
2References
2Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 2, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Apr 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A biaxial oriented polyester film of the present invention has a density of 1.386 g/cm.sup.3 or more. A sum Y of the coefficients of the heat shrinkage in the machine direction and in the transverse direction of the film at a temperature of 150.degree. C. is 4.5% or more, and a sum X (kg/mm.sup.2) of F.sub.5 values in the machine direction and in the transverse direction of the film and the sum Y satisfy the following expression (I): EQU Y.sup.2 +3.2Y.gtoreq.19.2X-393.6 (I) wherein the F.sub.5 value refers to an applied force required for extending a film by 5%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.