Cellulose acylate laminate film, method for producing cellulose acylate laminate film, polarizer and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorsAkira Ikeda, Jun Takeda, Hiromichi Tachikawa, Shinya Watanabe
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Abstract
A cellulose acylate laminate film, which comprises a low-substitution layer comprising a non-phosphate compound and a cellulose acylate having a total degree of acyl substitution of more than 2.0 and less than 2.7 and a high-substitution layer comprising a cellulose acylate having a total degree of acyl substitution of more than 2.7<Z2, wherein Re at a wavelength of 550 nm is the same as or larger than Re at a wavelength of 440 nm.
Claims20
A cellulose acylate laminate film, which comprises:
- a low-substitution layer comprising a non-phosphate compound and a cellulose acylate that satisfies the following formula (1):
- 2.0<Z1<2.7 (1)
- wherein Z1 means the total degree of acyl substitution of the cellulose acylate of the low-substitution layer, and
- a high-substitution layer comprising a cellulose acylate that satisfies the following formula (2):
- 2.7<Z2, (2)
- wherein Z2 means the total degree of acyl substitution of the cellulose acylate of the high-substitution layer, and
- wherein:
- the high-substitution layer is laminated on at least one face of the low-substitution layer,
- the in-plane retardation of the film at a wavelength of 550 nm, Re (550), is the same as or larger than the in-plane retardation of the film at a wavelength of 440 nm, Re (440), and
- the thickness-direction retardation of the film at a wavelength of 550 nm, Rth (550), is the same as or larger than the thickness-direction retardation of the film at a wavelength of 440 nm, Rth (440).
A polarizer comprising a cellulose acylate laminate film, wherein the cellulose acylate laminate film comprises:
- a low-substitution layer comprising a non-phosphate compound and a cellulose acylate that satisfies the following formula (1):
- 2.0<Z1<2.7 (1)
- wherein Z1 means the total degree of acyl substitution of the cellulose acylate of the low-substitution layer, and
- a high-substitution layer comprising a cellulose acylate that satisfies the following formula (2):
- 2.7<Z2, (2)
- wherein Z2 means the total degree of acyl substitution of the cellulose acylate, of the high-substitution layer, and
- wherein:
- the high-substitution layer is laminated on at least one face of the low-substitution layer,
- the in-plane retardation of the film at a wavelength of 550 nm, Re (550), is the same as or larger than the in-plane retardation of the film at a wavelength of 440 nm, Re (440), and
- the thickness-direction retardation of the film at a wavelength of 550 nm, Rth (550), is the same as or larger than the thickness-direction retardation of the film at a wavelength of 440 nm, Rth (440).
A liquid crystal display device comprises a cellulose acylate laminate film, wherein the cellulose acylate laminate film comprises:
- a low-substitution layer comprising a non-phosphate compound and a cellulose acylate that satisfies the following formula (1):
- 2.0<Z1<2.7 (1)
- wherein Z1 means the total degree of acyl substitution of the cellulose acylate of the low-substitution layer, and
- a high-substitution layer comprising a cellulose acylate that satisfies the following formula (2):
- 2.7<Z2, (2)
- wherein Z2 means the total degree of acyl substitution of the cellulose acylate of the high-substitution layer, and
- wherein:
- the high-substitution layer is laminated on at least one face of the low-substitution layer,
- the in-plane retardation of the film at a wavelength of 550 nm, Re (550), is the same as or larger than the in-plane retardation of the film at a wavelength of 440 nm, Re(440), and
- the thickness-direction retardation of the film at a wavelength of 550 nm, Rth (550), is the same as or larger than the thickness-direction retardation of the film at a wavelength of 440 nm, Rth (440).
Dependencies are inferred from the claim text.