Retardation film web, circularly polarizing plate and organic EL panel
US9417369B2 · kind B2 · utility
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Key dates
| Filing date | Mar 28, 2013 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Mar 28, 2033 |
Classification
- Technology area (CPC —)General
Abstract
The present invention provides a retardation film web having sufficient reversed wavelength dispersion characteristics and favorable for film lamination according to a roll-to-roll system. A retardation film web of the present invention includes a polycarbonate resin or a polyester carbonate resin, an orientation angle θ which is an angle between a slow axis and a width direction satisfies the following formula (I), and a ratio of an in-plane retardation R450 measured at a wavelength of 450 nm to an in-plane retardation R550 measured at a wavelength of 550 nm satisfies the following formula (II):38°≦θ≦52° (I)R450/R550<1 (II).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.