发明名称 |
RETARDATION FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY |
摘要 |
To provide a retardation film that, while maintaining a high retardation value, has increased durability such as moist heat resistance and can prevent the occurrence of color unevenness even if made in a size having a large area. The retardation film contains a cellulose ester as the primary component, has a film thickness of 15 μm or more and less than 40 μm, has a film thickness variation both in the widthwise direction and lengthwise direction of 0 to 4 μm, and satisfies an Rt humidity fluctuation represented by the formula (1) described below of 1% to 12%.;Formula (1): Rt humidity fluctuation=(ΔRt value, a difference of retardation Rt(590) values in the thickness direction represented by the following formula (ii) measured at a wavelength of 590 nm after the film has been left to stand for 5 hours in each of a 23° C., 20% relative humidity environment and a 23° C., 80% relative humidity environment)/(Rt(590) value measured after the film has been left to stand for 5 hours in a 23° C., 55% relative humidity environment)×100.;Formula (ii): Rt(590)={(nx+ny)/2−nz}×d;(wherein nx represents a refractive index in the slow axis direction in the film plane, ny represents a refractive index in the direction perpendicular to the slow axis in the film plane, nz represents a refractive index in the thickness direction of the film, and d represents a film thickness (nm), respectively). |
申请公布号 |
US2015323703(A1) |
申请公布日期 |
2015.11.12 |
申请号 |
US201314649101 |
申请日期 |
2013.11.13 |
申请人 |
KONICA MINOLTA, INC. |
发明人 |
KANEKO Yuki;TAKIMOTO Masataka;NANJIYOU Takashi;TAKAGI Takahiro;SHIMANE Yuta;NISHIMURA Masumi |
分类号 |
G02B1/04;G02B5/30;C08J5/18;G02F1/1335 |
主分类号 |
G02B1/04 |
代理机构 |
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代理人 |
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主权项 |
1. A retardation film comprising a cellulose ester as the primary component, which has a film thickness of 15 μm or more and less than 40 μm, has a film thickness variation both in the widthwise direction and lengthwise direction of 0 to 4 μm, and satisfies an Rt humidity fluctuation represented by the formula (1) described below of 1% to 12%:
Formula (1): Rt humidity fluctuation=(ΔRt value, a difference of retardation Rt(590) values in the thickness direction represented by the following formula (ii) measured at a wavelength of 590 nm after the film has been left to stand for 5 hours in each of a 23° C., 20% relative humidity environment and a 23° C., 80% relative humidity environment)/(Rt(590) value measured after the film has been left to stand for 5 hours in a 23° C., 55% relative humidity environment)×100 Formula (ii): Rt(590)={(nx+ny)/2−nz}×d (wherein nx represents a refractive index in the slow axis direction in the film plane, ny represents a refractive index in the direction perpendicular to the slow axis in the film plane, nz represents a refractive index in the thickness direction of the film, and d represents a film thickness (nm), respectively). |
地址 |
Tokyo JP |