Cellulose acylate film containing polymer additive

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PURPOSE : A cellulose acylate film is provided to improve mechanical strength or heat resistance, to enable retardation control, to ensure excellent optical characteristic, and to be useful for optical compensation.CONSTITUTION : A cellulose acylate film comprises a poly(N-vinylpyrrolidone)-based copolymer as an additive; Re(λ) and Rth(λ) are chemical formula (I) : 0 COPYRIGHT KIPO 2010