RETARDATION FILM HAVING ZERO WAVELENGTH DISPERSIBILITY AND UNIFORM IN-PLANE RETARDATION VALUE AND MULTILAYER OPTICAL FILM HAVING POSITIVE DISPERSIBILITY IN WAVELENGTH

摘要

PROBLEM TO BE SOLVED: To provide a retardation film having zero wavelength dispersibility and uniform in-plane retardation value, and to provide a multilayer optical film having positive wavelength dispersibility.

SOLUTION: The retardation film is produced of a homo polypropylene resin having an isotactic index of ≥85% and has zero wavelength dispersibility and uniform in-plane retardation (Re) value, wherein Re value at a specific part is in a range of ±5 nm compared with a mean value. Another retardation film having negative wavelength dispersibility is laminated on the retardation film having zero wavelength dispersibility to produce the multilayer optical film having positive wavelength dispersibility.

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