| 简介 |
PURPOSE : A cellulose acylate film is provided to have a low retardation value of vertical direction, to be able to control optical properties according to the kinds and the composition of polymer additives, and to industrially provide an optical compensation sheet of which color deformation and contrast of an IPS mode liquid crystal display device.
CONSTITUTION : A cellulose acylate film comprises an aliphatic polycarbonate based polymer. Re (λ) and Rth (λ) satisfy formula 1 : 0 Δ Re(589) Δ 5, Rth(589)|Δ40, and satisfy formula 2 : |Re(400) - Re(700)|Δ2, |Rth(400) - Rth(700)|Δ10. In formulas, Re (λ) is an in-plane retardation(nm) at the wavelength of λ nm, and Rth(λ) is retardation value of vertical direction at the wavelength of λ nm. 0.1-40 parts by weight of the aliphatic polycarbonate based polymer is comprised based on 100.0 parts by weight of cellulose acrylate resin.
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