Cellulose acylate film, polarizer and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorsJun TAKEDA, Nobutaka FUKAGAWA, Yoji ITO
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Abstract
A cellulose acylate film, which comprises a cellulose acylate having a total degree of substitution of from 2.0 to 2.5, a first optical enhancer of an ester having an absorption maximum λmax at less than 250 nm, and a second optical enhancer having an absorption maximum λmax at from more than 240 nm to 300 nm, and satisfies the following formulae (1) and (2), in which the ester of the first optical enhancer is a compound obtained through condensation of an oxo-acid of an organic acid or an inorganic acid and a hydroxyl group-containing compound: 40 nm≦Re(550)≦80 nm (1) 100 nm≦Rth(550)≦300 nm. (2)
Claims20
A cellulose acylate film, which comprises a cellulose acylate having a total degree of substitution of from 2.0 to 2.5, at least one first optical enhancer of an ester having an absorption maximum λmax at less than 250 nm, and at least one second optical enhancer having an absorption maximum λmax at from more than 240 nm to 300 nm, and satisfies the following formulae (1) and (2), in which the ester of the first optical enhancer is a compound obtained through condensation of an oxo-acid of an organic acid or an inorganic acid and a hydroxyl group-containing compound:
- 40 nm≦Re(550)≦80 nm (1)
- wherein Re(550) means the in-plane retardation of the film at a wavelength of 550 nm,
- 100 nm≦Rth(550)≦300 nm (2)
- wherein Rth(550) means the thickness-direction retardation of the film at a wavelength of 550 nm.
A polarizer comprising a polarizing element and a cellulose acylate film on at least one side of the polarizing element, wherein the cellulose acylate film comprises a cellulose acylate having a total degree of substitution of from 2.0 to 2.5, at least one first optical enhancer of an ester having an absorption maximum λmax at less than 250 nm, and at least one second optical enhancer having an absorption maximum λmax at from more than 240 nm to 300 nm, and satisfies the following formulae (1) and (2), in which the ester of the first optical enhancer is a compound obtained through condensation of an oxo-acid of an organic acid or an inorganic acid and a hydroxyl group-containing compound:
- 40 nm≦Re(550)≦80 nm (1)
- wherein Re(550) means the in-plane retardation of the film at a wavelength of 550 nm,
- 100 nm≦Rth(550)≦300 nm (2)
- wherein Rth(550) means the thickness-direction retardation of the film at a wavelength of 550 nm.
A liquid crystal display device comprising a polarizer comprising a polarizing element and a cellulose acylate film on at least one side of the polarizing element, wherein the cellulose acylate film comprises a cellulose acylate having a total degree of substitution of from 2.0 to 2.5, at least one first optical enhancer of an ester having an absorption maximum λmax at less than 250 nm, and at least one second optical enhancer having an absorption maximum λmax at from more than 240 nm to 300 nm, and satisfies the following formulae (1) and (2), in which the ester of the first optical enhancer is a compound obtained through condensation of an oxo-acid of an organic acid or an inorganic acid and a hydroxyl group-containing compound:
- 40 nm≦Re(550)≦80 nm (1)
- wherein Re(550) means the in-plane retardation of the film at a wavelength of 550 nm,
- 100 nm≦Rth(550)≦300 nm (2)
- wherein Rth(550) means the thickness-direction retardation of the film at a wavelength of 550 nm.
Dependencies are inferred from the claim text.