Retardation film, circularly-polarizing plate, and image-displaying device
US10732323B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 14, 2016 |
| Grant date | Aug 4, 2020 |
| Priority date | — |
| Expiry date | Feb 24, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/031
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of R1 to R9 are the same as in the description).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.