Optical film comprising birefringent naphthalate copolyester having branched or cyclic C4-C10 alkyl units
US8263731B2 · kind B2 · utility
20Cited by
25References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2011 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Jul 14, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to multilayer optical films and birefringent copolyester films. The birefringent copolyester optical layer or birefringent copolyester film comprises a major amount of naphthalate units, ethylene units, and a minor amount of branched or cyclic C4 to C10 alkyl units. Also described are certain copolyester polymeric materials further comprising subunits of a phthalate ionomer such as dimethyl sulfosodium isophthalate ionomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.